x86/kvm/vmx/nested.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/objtool.h>
   4 #include <linux/percpu.h>
   5
   6 #include <asm/debugreg.h>
   7 #include <asm/mmu_context.h>
   8
   9 #include "cpuid.h"
  10 #include "evmcs.h"
  11 #include "hyperv.h"
  12 #include "mmu.h"
  13 #include "nested.h"
  14 #include "pmu.h"
  15 #include "sgx.h"
  16 #include "trace.h"
  17 #include "vmx.h"
  18 #include "x86.h"
  19
  20 static bool __read_mostly enable_shadow_vmcs = 1;
  21 module_param_named(enable_shadow_vmcs, enable_shadow_vmcs, bool, S_IRUGO);
  22
  23 static bool __read_mostly nested_early_check = 0;
  24 module_param(nested_early_check, bool, S_IRUGO);
  25
  26 #define CC KVM_NESTED_VMENTER_CONSISTENCY_CHECK
  27
  28 /*
  29  * Hyper-V requires all of these, so mark them as supported even though
  30  * they are just treated the same as all-context.
  31  */
  32 #define VMX_VPID_EXTENT_SUPPORTED_MASK          \
  33         (VMX_VPID_EXTENT_INDIVIDUAL_ADDR_BIT |  \
  34         VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT |    \
  35         VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT |    \
  36         VMX_VPID_EXTENT_SINGLE_NON_GLOBAL_BIT)
  37
  38 #define VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE 5
  39
  40 enum {
  41         VMX_VMREAD_BITMAP,
  42         VMX_VMWRITE_BITMAP,
  43         VMX_BITMAP_NR
  44 };
  45 static unsigned long *vmx_bitmap[VMX_BITMAP_NR];
  46
  47 #define vmx_vmread_bitmap                    (vmx_bitmap[VMX_VMREAD_BITMAP])
  48 #define vmx_vmwrite_bitmap                   (vmx_bitmap[VMX_VMWRITE_BITMAP])
  49
  50 struct shadow_vmcs_field {
  51         u16     encoding;
  52         u16     offset;
  53 };
  54 static struct shadow_vmcs_field shadow_read_only_fields[] = {
  55 #define SHADOW_FIELD_RO(x, y) { x, offsetof(struct vmcs12, y) },
  56 #include "vmcs_shadow_fields.h"
  57 };
  58 static int max_shadow_read_only_fields =
  59         ARRAY_SIZE(shadow_read_only_fields);
  60
  61 static struct shadow_vmcs_field shadow_read_write_fields[] = {
  62 #define SHADOW_FIELD_RW(x, y) { x, offsetof(struct vmcs12, y) },
  63 #include "vmcs_shadow_fields.h"
  64 };
  65 static int max_shadow_read_write_fields =
  66         ARRAY_SIZE(shadow_read_write_fields);
  67
  68 static void init_vmcs_shadow_fields(void)
  69 {
  70         int i, j;
  71
  72         memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE);
  73         memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE);
  74
  75         for (i = j = 0; i < max_shadow_read_only_fields; i++) {
  76                 struct shadow_vmcs_field entry = shadow_read_only_fields[i];
  77                 u16 field = entry.encoding;
  78
  79                 if (vmcs_field_width(field) == VMCS_FIELD_WIDTH_U64 &&
  80                     (i + 1 == max_shadow_read_only_fields ||
  81                      shadow_read_only_fields[i + 1].encoding != field + 1))
  82                         pr_err("Missing field from shadow_read_only_field %x\n",
  83                                field + 1);
  84
  85                 clear_bit(field, vmx_vmread_bitmap);
  86                 if (field & 1)
  87 #ifdef CONFIG_X86_64
  88                         continue;
  89 #else
  90                         entry.offset += sizeof(u32);
  91 #endif
  92                 shadow_read_only_fields[j++] = entry;
  93         }
  94         max_shadow_read_only_fields = j;
  95
  96         for (i = j = 0; i < max_shadow_read_write_fields; i++) {
  97                 struct shadow_vmcs_field entry = shadow_read_write_fields[i];
  98                 u16 field = entry.encoding;
  99
 100                 if (vmcs_field_width(field) == VMCS_FIELD_WIDTH_U64 &&
 101                     (i + 1 == max_shadow_read_write_fields ||
 102                      shadow_read_write_fields[i + 1].encoding != field + 1))
 103                         pr_err("Missing field from shadow_read_write_field %x\n",
 104                                field + 1);
 105
 106                 WARN_ONCE(field >= GUEST_ES_AR_BYTES &&
 107                           field <= GUEST_TR_AR_BYTES,
 108                           "Update vmcs12_write_any() to drop reserved bits from AR_BYTES");
 109
 110                 /*
 111                  * PML and the preemption timer can be emulated, but the
 112                  * processor cannot vmwrite to fields that don't exist
 113                  * on bare metal.
 114                  */
 115                 switch (field) {
 116                 case GUEST_PML_INDEX:
 117                         if (!cpu_has_vmx_pml())
 118                                 continue;
 119                         break;
 120                 case VMX_PREEMPTION_TIMER_VALUE:
 121                         if (!cpu_has_vmx_preemption_timer())
 122                                 continue;
 123                         break;
 124                 case GUEST_INTR_STATUS:
 125                         if (!cpu_has_vmx_apicv())
 126                                 continue;
 127                         break;
 128                 default:
 129                         break;
 130                 }
 131
 132                 clear_bit(field, vmx_vmwrite_bitmap);
 133                 clear_bit(field, vmx_vmread_bitmap);
 134                 if (field & 1)
 135 #ifdef CONFIG_X86_64
 136                         continue;
 137 #else
 138                         entry.offset += sizeof(u32);
 139 #endif
 140                 shadow_read_write_fields[j++] = entry;
 141         }
 142         max_shadow_read_write_fields = j;
 143 }
 144
 145 /*
 146  * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
 147  * set the success or error code of an emulated VMX instruction (as specified
 148  * by Vol 2B, VMX Instruction Reference, "Conventions"), and skip the emulated
 149  * instruction.
 150  */
 151 static int nested_vmx_succeed(struct kvm_vcpu *vcpu)
 152 {
 153         vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
 154                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
 155                             X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
 156         return kvm_skip_emulated_instruction(vcpu);
 157 }
 158
 159 static int nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
 160 {
 161         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
 162                         & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
 163                             X86_EFLAGS_SF | X86_EFLAGS_OF))
 164                         | X86_EFLAGS_CF);
 165         return kvm_skip_emulated_instruction(vcpu);
 166 }
 167
 168 static int nested_vmx_failValid(struct kvm_vcpu *vcpu,
 169                                 u32 vm_instruction_error)
 170 {
 171         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
 172                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
 173                             X86_EFLAGS_SF | X86_EFLAGS_OF))
 174                         | X86_EFLAGS_ZF);
 175         get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
 176         /*
 177          * We don't need to force sync to shadow VMCS because
 178          * VM_INSTRUCTION_ERROR is not shadowed. Enlightened VMCS 'shadows' all
 179          * fields and thus must be synced.
 180          */
 181         if (to_vmx(vcpu)->nested.hv_evmcs_vmptr != EVMPTR_INVALID)
 182                 to_vmx(vcpu)->nested.need_vmcs12_to_shadow_sync = true;
 183
 184         return kvm_skip_emulated_instruction(vcpu);
 185 }
 186
 187 static int nested_vmx_fail(struct kvm_vcpu *vcpu, u32 vm_instruction_error)
 188 {
 189         struct vcpu_vmx *vmx = to_vmx(vcpu);
 190
 191         /*
 192          * failValid writes the error number to the current VMCS, which
 193          * can't be done if there isn't a current VMCS.
 194          */
 195         if (vmx->nested.current_vmptr == INVALID_GPA &&
 196             !evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
 197                 return nested_vmx_failInvalid(vcpu);
 198
 199         return nested_vmx_failValid(vcpu, vm_instruction_error);
 200 }
 201
 202 static void nested_vmx_abort(struct kvm_vcpu *vcpu, u32 indicator)
 203 {
 204         /* TODO: not to reset guest simply here. */
 205         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 206         pr_debug_ratelimited("kvm: nested vmx abort, indicator %d\n", indicator);
 207 }
 208
 209 static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
 210 {
 211         return fixed_bits_valid(control, low, high);
 212 }
 213
 214 static inline u64 vmx_control_msr(u32 low, u32 high)
 215 {
 216         return low | ((u64)high << 32);
 217 }
 218
 219 static void vmx_disable_shadow_vmcs(struct vcpu_vmx *vmx)
 220 {
 221         secondary_exec_controls_clearbit(vmx, SECONDARY_EXEC_SHADOW_VMCS);
 222         vmcs_write64(VMCS_LINK_POINTER, INVALID_GPA);
 223         vmx->nested.need_vmcs12_to_shadow_sync = false;
 224 }
 225
 226 static inline void nested_release_evmcs(struct kvm_vcpu *vcpu)
 227 {
 228         struct vcpu_vmx *vmx = to_vmx(vcpu);
 229
 230         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
 231                 kvm_vcpu_unmap(vcpu, &vmx->nested.hv_evmcs_map, true);
 232                 vmx->nested.hv_evmcs = NULL;
 233         }
 234
 235         vmx->nested.hv_evmcs_vmptr = EVMPTR_INVALID;
 236 }
 237
 238 static void vmx_sync_vmcs_host_state(struct vcpu_vmx *vmx,
 239                                      struct loaded_vmcs *prev)
 240 {
 241         struct vmcs_host_state *dest, *src;
 242
 243         if (unlikely(!vmx->guest_state_loaded))
 244                 return;
 245
 246         src = &prev->host_state;
 247         dest = &vmx->loaded_vmcs->host_state;
 248
 249         vmx_set_host_fs_gs(dest, src->fs_sel, src->gs_sel, src->fs_base, src->gs_base);
 250         dest->ldt_sel = src->ldt_sel;
 251 #ifdef CONFIG_X86_64
 252         dest->ds_sel = src->ds_sel;
 253         dest->es_sel = src->es_sel;
 254 #endif
 255 }
 256
 257 static void vmx_switch_vmcs(struct kvm_vcpu *vcpu, struct loaded_vmcs *vmcs)
 258 {
 259         struct vcpu_vmx *vmx = to_vmx(vcpu);
 260         struct loaded_vmcs *prev;
 261         int cpu;
 262
 263         if (WARN_ON_ONCE(vmx->loaded_vmcs == vmcs))
 264                 return;
 265
 266         cpu = get_cpu();
 267         prev = vmx->loaded_vmcs;
 268         vmx->loaded_vmcs = vmcs;
 269         vmx_vcpu_load_vmcs(vcpu, cpu, prev);
 270         vmx_sync_vmcs_host_state(vmx, prev);
 271         put_cpu();
 272
 273         vcpu->arch.regs_avail = ~VMX_REGS_LAZY_LOAD_SET;
 274
 275         /*
 276          * All lazily updated registers will be reloaded from VMCS12 on both
 277          * vmentry and vmexit.
 278          */
 279         vcpu->arch.regs_dirty = 0;
 280 }
 281
 282 /*
 283  * Free whatever needs to be freed from vmx->nested when L1 goes down, or
 284  * just stops using VMX.
 285  */
 286 static void free_nested(struct kvm_vcpu *vcpu)
 287 {
 288         struct vcpu_vmx *vmx = to_vmx(vcpu);
 289
 290         if (WARN_ON_ONCE(vmx->loaded_vmcs != &vmx->vmcs01))
 291                 vmx_switch_vmcs(vcpu, &vmx->vmcs01);
 292
 293         if (!vmx->nested.vmxon && !vmx->nested.smm.vmxon)
 294                 return;
 295
 296         kvm_clear_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
 297
 298         vmx->nested.vmxon = false;
 299         vmx->nested.smm.vmxon = false;
 300         vmx->nested.vmxon_ptr = INVALID_GPA;
 301         free_vpid(vmx->nested.vpid02);
 302         vmx->nested.posted_intr_nv = -1;
 303         vmx->nested.current_vmptr = INVALID_GPA;
 304         if (enable_shadow_vmcs) {
 305                 vmx_disable_shadow_vmcs(vmx);
 306                 vmcs_clear(vmx->vmcs01.shadow_vmcs);
 307                 free_vmcs(vmx->vmcs01.shadow_vmcs);
 308                 vmx->vmcs01.shadow_vmcs = NULL;
 309         }
 310         kfree(vmx->nested.cached_vmcs12);
 311         vmx->nested.cached_vmcs12 = NULL;
 312         kfree(vmx->nested.cached_shadow_vmcs12);
 313         vmx->nested.cached_shadow_vmcs12 = NULL;
 314         /*
 315          * Unpin physical memory we referred to in the vmcs02.  The APIC access
 316          * page's backing page (yeah, confusing) shouldn't actually be accessed,
 317          * and if it is written, the contents are irrelevant.
 318          */
 319         kvm_vcpu_unmap(vcpu, &vmx->nested.apic_access_page_map, false);
 320         kvm_vcpu_unmap(vcpu, &vmx->nested.virtual_apic_map, true);
 321         kvm_vcpu_unmap(vcpu, &vmx->nested.pi_desc_map, true);
 322         vmx->nested.pi_desc = NULL;
 323
 324         kvm_mmu_free_roots(vcpu->kvm, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
 325
 326         nested_release_evmcs(vcpu);
 327
 328         free_loaded_vmcs(&vmx->nested.vmcs02);
 329 }
 330
 331 /*
 332  * Ensure that the current vmcs of the logical processor is the
 333  * vmcs01 of the vcpu before calling free_nested().
 334  */
 335 void nested_vmx_free_vcpu(struct kvm_vcpu *vcpu)
 336 {
 337         vcpu_load(vcpu);
 338         vmx_leave_nested(vcpu);
 339         vcpu_put(vcpu);
 340 }
 341
 342 #define EPTP_PA_MASK   GENMASK_ULL(51, 12)
 343
 344 static bool nested_ept_root_matches(hpa_t root_hpa, u64 root_eptp, u64 eptp)
 345 {
 346         return VALID_PAGE(root_hpa) &&
 347                ((root_eptp & EPTP_PA_MASK) == (eptp & EPTP_PA_MASK));
 348 }
 349
 350 static void nested_ept_invalidate_addr(struct kvm_vcpu *vcpu, gpa_t eptp,
 351                                        gpa_t addr)
 352 {
 353         uint i;
 354         struct kvm_mmu_root_info *cached_root;
 355
 356         WARN_ON_ONCE(!mmu_is_nested(vcpu));
 357
 358         for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
 359                 cached_root = &vcpu->arch.mmu->prev_roots[i];
 360
 361                 if (nested_ept_root_matches(cached_root->hpa, cached_root->pgd,
 362                                             eptp))
 363                         vcpu->arch.mmu->invlpg(vcpu, addr, cached_root->hpa);
 364         }
 365 }
 366
 367 static void nested_ept_inject_page_fault(struct kvm_vcpu *vcpu,
 368                 struct x86_exception *fault)
 369 {
 370         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 371         struct vcpu_vmx *vmx = to_vmx(vcpu);
 372         u32 vm_exit_reason;
 373         unsigned long exit_qualification = vcpu->arch.exit_qualification;
 374
 375         if (vmx->nested.pml_full) {
 376                 vm_exit_reason = EXIT_REASON_PML_FULL;
 377                 vmx->nested.pml_full = false;
 378                 exit_qualification &= INTR_INFO_UNBLOCK_NMI;
 379         } else {
 380                 if (fault->error_code & PFERR_RSVD_MASK)
 381                         vm_exit_reason = EXIT_REASON_EPT_MISCONFIG;
 382                 else
 383                         vm_exit_reason = EXIT_REASON_EPT_VIOLATION;
 384
 385                 /*
 386                  * Although the caller (kvm_inject_emulated_page_fault) would
 387                  * have already synced the faulting address in the shadow EPT
 388                  * tables for the current EPTP12, we also need to sync it for
 389                  * any other cached EPTP02s based on the same EP4TA, since the
 390                  * TLB associates mappings to the EP4TA rather than the full EPTP.
 391                  */
 392                 nested_ept_invalidate_addr(vcpu, vmcs12->ept_pointer,
 393                                            fault->address);
 394         }
 395
 396         nested_vmx_vmexit(vcpu, vm_exit_reason, 0, exit_qualification);
 397         vmcs12->guest_physical_address = fault->address;
 398 }
 399
 400 static void nested_ept_new_eptp(struct kvm_vcpu *vcpu)
 401 {
 402         struct vcpu_vmx *vmx = to_vmx(vcpu);
 403         bool execonly = vmx->nested.msrs.ept_caps & VMX_EPT_EXECUTE_ONLY_BIT;
 404         int ept_lpage_level = ept_caps_to_lpage_level(vmx->nested.msrs.ept_caps);
 405
 406         kvm_init_shadow_ept_mmu(vcpu, execonly, ept_lpage_level,
 407                                 nested_ept_ad_enabled(vcpu),
 408                                 nested_ept_get_eptp(vcpu));
 409 }
 410
 411 static void nested_ept_init_mmu_context(struct kvm_vcpu *vcpu)
 412 {
 413         WARN_ON(mmu_is_nested(vcpu));
 414
 415         vcpu->arch.mmu = &vcpu->arch.guest_mmu;
 416         nested_ept_new_eptp(vcpu);
 417         vcpu->arch.mmu->get_guest_pgd     = nested_ept_get_eptp;
 418         vcpu->arch.mmu->inject_page_fault = nested_ept_inject_page_fault;
 419         vcpu->arch.mmu->get_pdptr         = kvm_pdptr_read;
 420
 421         vcpu->arch.walk_mmu              = &vcpu->arch.nested_mmu;
 422 }
 423
 424 static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu)
 425 {
 426         vcpu->arch.mmu = &vcpu->arch.root_mmu;
 427         vcpu->arch.walk_mmu = &vcpu->arch.root_mmu;
 428 }
 429
 430 static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
 431                                             u16 error_code)
 432 {
 433         bool inequality, bit;
 434
 435         bit = (vmcs12->exception_bitmap & (1u << PF_VECTOR)) != 0;
 436         inequality =
 437                 (error_code & vmcs12->page_fault_error_code_mask) !=
 438                  vmcs12->page_fault_error_code_match;
 439         return inequality ^ bit;
 440 }
 441
 442 static bool nested_vmx_is_exception_vmexit(struct kvm_vcpu *vcpu, u8 vector,
 443                                            u32 error_code)
 444 {
 445         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 446
 447         /*
 448          * Drop bits 31:16 of the error code when performing the #PF mask+match
 449          * check.  All VMCS fields involved are 32 bits, but Intel CPUs never
 450          * set bits 31:16 and VMX disallows setting bits 31:16 in the injected
 451          * error code.  Including the to-be-dropped bits in the check might
 452          * result in an "impossible" or missed exit from L1's perspective.
 453          */
 454         if (vector == PF_VECTOR)
 455                 return nested_vmx_is_page_fault_vmexit(vmcs12, (u16)error_code);
 456
 457         return (vmcs12->exception_bitmap & (1u << vector));
 458 }
 459
 460 static int nested_vmx_check_io_bitmap_controls(struct kvm_vcpu *vcpu,
 461                                                struct vmcs12 *vmcs12)
 462 {
 463         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
 464                 return 0;
 465
 466         if (CC(!page_address_valid(vcpu, vmcs12->io_bitmap_a)) ||
 467             CC(!page_address_valid(vcpu, vmcs12->io_bitmap_b)))
 468                 return -EINVAL;
 469
 470         return 0;
 471 }
 472
 473 static int nested_vmx_check_msr_bitmap_controls(struct kvm_vcpu *vcpu,
 474                                                 struct vmcs12 *vmcs12)
 475 {
 476         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
 477                 return 0;
 478
 479         if (CC(!page_address_valid(vcpu, vmcs12->msr_bitmap)))
 480                 return -EINVAL;
 481
 482         return 0;
 483 }
 484
 485 static int nested_vmx_check_tpr_shadow_controls(struct kvm_vcpu *vcpu,
 486                                                 struct vmcs12 *vmcs12)
 487 {
 488         if (!nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW))
 489                 return 0;
 490
 491         if (CC(!page_address_valid(vcpu, vmcs12->virtual_apic_page_addr)))
 492                 return -EINVAL;
 493
 494         return 0;
 495 }
 496
 497 /*
 498  * For x2APIC MSRs, ignore the vmcs01 bitmap.  L1 can enable x2APIC without L1
 499  * itself utilizing x2APIC.  All MSRs were previously set to be intercepted,
 500  * only the "disable intercept" case needs to be handled.
 501  */
 502 static void nested_vmx_disable_intercept_for_x2apic_msr(unsigned long *msr_bitmap_l1,
 503                                                         unsigned long *msr_bitmap_l0,
 504                                                         u32 msr, int type)
 505 {
 506         if (type & MSR_TYPE_R && !vmx_test_msr_bitmap_read(msr_bitmap_l1, msr))
 507                 vmx_clear_msr_bitmap_read(msr_bitmap_l0, msr);
 508
 509         if (type & MSR_TYPE_W && !vmx_test_msr_bitmap_write(msr_bitmap_l1, msr))
 510                 vmx_clear_msr_bitmap_write(msr_bitmap_l0, msr);
 511 }
 512
 513 static inline void enable_x2apic_msr_intercepts(unsigned long *msr_bitmap)
 514 {
 515         int msr;
 516
 517         for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) {
 518                 unsigned word = msr / BITS_PER_LONG;
 519
 520                 msr_bitmap[word] = ~0;
 521                 msr_bitmap[word + (0x800 / sizeof(long))] = ~0;
 522         }
 523 }
 524
 525 #define BUILD_NVMX_MSR_INTERCEPT_HELPER(rw)                                     \
 526 static inline                                                                   \
 527 void nested_vmx_set_msr_##rw##_intercept(struct vcpu_vmx *vmx,                  \
 528                                          unsigned long *msr_bitmap_l1,          \
 529                                          unsigned long *msr_bitmap_l0, u32 msr) \
 530 {                                                                               \
 531         if (vmx_test_msr_bitmap_##rw(vmx->vmcs01.msr_bitmap, msr) ||            \
 532             vmx_test_msr_bitmap_##rw(msr_bitmap_l1, msr))                       \
 533                 vmx_set_msr_bitmap_##rw(msr_bitmap_l0, msr);                    \
 534         else                                                                    \
 535                 vmx_clear_msr_bitmap_##rw(msr_bitmap_l0, msr);                  \
 536 }
 537 BUILD_NVMX_MSR_INTERCEPT_HELPER(read)
 538 BUILD_NVMX_MSR_INTERCEPT_HELPER(write)
 539
 540 static inline void nested_vmx_set_intercept_for_msr(struct vcpu_vmx *vmx,
 541                                                     unsigned long *msr_bitmap_l1,
 542                                                     unsigned long *msr_bitmap_l0,
 543                                                     u32 msr, int types)
 544 {
 545         if (types & MSR_TYPE_R)
 546                 nested_vmx_set_msr_read_intercept(vmx, msr_bitmap_l1,
 547                                                   msr_bitmap_l0, msr);
 548         if (types & MSR_TYPE_W)
 549                 nested_vmx_set_msr_write_intercept(vmx, msr_bitmap_l1,
 550                                                    msr_bitmap_l0, msr);
 551 }
 552
 553 /*
 554  * Merge L0's and L1's MSR bitmap, return false to indicate that
 555  * we do not use the hardware.
 556  */
 557 static inline bool nested_vmx_prepare_msr_bitmap(struct kvm_vcpu *vcpu,
 558                                                  struct vmcs12 *vmcs12)
 559 {
 560         struct vcpu_vmx *vmx = to_vmx(vcpu);
 561         int msr;
 562         unsigned long *msr_bitmap_l1;
 563         unsigned long *msr_bitmap_l0 = vmx->nested.vmcs02.msr_bitmap;
 564         struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
 565         struct kvm_host_map *map = &vmx->nested.msr_bitmap_map;
 566
 567         /* Nothing to do if the MSR bitmap is not in use.  */
 568         if (!cpu_has_vmx_msr_bitmap() ||
 569             !nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
 570                 return false;
 571
 572         /*
 573          * MSR bitmap update can be skipped when:
 574          * - MSR bitmap for L1 hasn't changed.
 575          * - Nested hypervisor (L1) is attempting to launch the same L2 as
 576          *   before.
 577          * - Nested hypervisor (L1) has enabled 'Enlightened MSR Bitmap' feature
 578          *   and tells KVM (L0) there were no changes in MSR bitmap for L2.
 579          */
 580         if (!vmx->nested.force_msr_bitmap_recalc && evmcs &&
 581             evmcs->hv_enlightenments_control.msr_bitmap &&
 582             evmcs->hv_clean_fields & HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP)
 583                 return true;
 584
 585         if (kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->msr_bitmap), map))
 586                 return false;
 587
 588         msr_bitmap_l1 = (unsigned long *)map->hva;
 589
 590         /*
 591          * To keep the control flow simple, pay eight 8-byte writes (sixteen
 592          * 4-byte writes on 32-bit systems) up front to enable intercepts for
 593          * the x2APIC MSR range and selectively toggle those relevant to L2.
 594          */
 595         enable_x2apic_msr_intercepts(msr_bitmap_l0);
 596
 597         if (nested_cpu_has_virt_x2apic_mode(vmcs12)) {
 598                 if (nested_cpu_has_apic_reg_virt(vmcs12)) {
 599                         /*
 600                          * L0 need not intercept reads for MSRs between 0x800
 601                          * and 0x8ff, it just lets the processor take the value
 602                          * from the virtual-APIC page; take those 256 bits
 603                          * directly from the L1 bitmap.
 604                          */
 605                         for (msr = 0x800; msr <= 0x8ff; msr += BITS_PER_LONG) {
 606                                 unsigned word = msr / BITS_PER_LONG;
 607
 608                                 msr_bitmap_l0[word] = msr_bitmap_l1[word];
 609                         }
 610                 }
 611
 612                 nested_vmx_disable_intercept_for_x2apic_msr(
 613                         msr_bitmap_l1, msr_bitmap_l0,
 614                         X2APIC_MSR(APIC_TASKPRI),
 615                         MSR_TYPE_R | MSR_TYPE_W);
 616
 617                 if (nested_cpu_has_vid(vmcs12)) {
 618                         nested_vmx_disable_intercept_for_x2apic_msr(
 619                                 msr_bitmap_l1, msr_bitmap_l0,
 620                                 X2APIC_MSR(APIC_EOI),
 621                                 MSR_TYPE_W);
 622                         nested_vmx_disable_intercept_for_x2apic_msr(
 623                                 msr_bitmap_l1, msr_bitmap_l0,
 624                                 X2APIC_MSR(APIC_SELF_IPI),
 625                                 MSR_TYPE_W);
 626                 }
 627         }
 628
 629         /*
 630          * Always check vmcs01's bitmap to honor userspace MSR filters and any
 631          * other runtime changes to vmcs01's bitmap, e.g. dynamic pass-through.
 632          */
 633 #ifdef CONFIG_X86_64
 634         nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
 635                                          MSR_FS_BASE, MSR_TYPE_RW);
 636
 637         nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
 638                                          MSR_GS_BASE, MSR_TYPE_RW);
 639
 640         nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
 641                                          MSR_KERNEL_GS_BASE, MSR_TYPE_RW);
 642 #endif
 643         nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
 644                                          MSR_IA32_SPEC_CTRL, MSR_TYPE_RW);
 645
 646         nested_vmx_set_intercept_for_msr(vmx, msr_bitmap_l1, msr_bitmap_l0,
 647                                          MSR_IA32_PRED_CMD, MSR_TYPE_W);
 648
 649         kvm_vcpu_unmap(vcpu, &vmx->nested.msr_bitmap_map, false);
 650
 651         vmx->nested.force_msr_bitmap_recalc = false;
 652
 653         return true;
 654 }
 655
 656 static void nested_cache_shadow_vmcs12(struct kvm_vcpu *vcpu,
 657                                        struct vmcs12 *vmcs12)
 658 {
 659         struct vcpu_vmx *vmx = to_vmx(vcpu);
 660         struct gfn_to_hva_cache *ghc = &vmx->nested.shadow_vmcs12_cache;
 661
 662         if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
 663             vmcs12->vmcs_link_pointer == INVALID_GPA)
 664                 return;
 665
 666         if (ghc->gpa != vmcs12->vmcs_link_pointer &&
 667             kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc,
 668                                       vmcs12->vmcs_link_pointer, VMCS12_SIZE))
 669                 return;
 670
 671         kvm_read_guest_cached(vmx->vcpu.kvm, ghc, get_shadow_vmcs12(vcpu),
 672                               VMCS12_SIZE);
 673 }
 674
 675 static void nested_flush_cached_shadow_vmcs12(struct kvm_vcpu *vcpu,
 676                                               struct vmcs12 *vmcs12)
 677 {
 678         struct vcpu_vmx *vmx = to_vmx(vcpu);
 679         struct gfn_to_hva_cache *ghc = &vmx->nested.shadow_vmcs12_cache;
 680
 681         if (!nested_cpu_has_shadow_vmcs(vmcs12) ||
 682             vmcs12->vmcs_link_pointer == INVALID_GPA)
 683                 return;
 684
 685         if (ghc->gpa != vmcs12->vmcs_link_pointer &&
 686             kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc,
 687                                       vmcs12->vmcs_link_pointer, VMCS12_SIZE))
 688                 return;
 689
 690         kvm_write_guest_cached(vmx->vcpu.kvm, ghc, get_shadow_vmcs12(vcpu),
 691                                VMCS12_SIZE);
 692 }
 693
 694 /*
 695  * In nested virtualization, check if L1 has set
 696  * VM_EXIT_ACK_INTR_ON_EXIT
 697  */
 698 static bool nested_exit_intr_ack_set(struct kvm_vcpu *vcpu)
 699 {
 700         return get_vmcs12(vcpu)->vm_exit_controls &
 701                 VM_EXIT_ACK_INTR_ON_EXIT;
 702 }
 703
 704 static int nested_vmx_check_apic_access_controls(struct kvm_vcpu *vcpu,
 705                                           struct vmcs12 *vmcs12)
 706 {
 707         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) &&
 708             CC(!page_address_valid(vcpu, vmcs12->apic_access_addr)))
 709                 return -EINVAL;
 710         else
 711                 return 0;
 712 }
 713
 714 static int nested_vmx_check_apicv_controls(struct kvm_vcpu *vcpu,
 715                                            struct vmcs12 *vmcs12)
 716 {
 717         if (!nested_cpu_has_virt_x2apic_mode(vmcs12) &&
 718             !nested_cpu_has_apic_reg_virt(vmcs12) &&
 719             !nested_cpu_has_vid(vmcs12) &&
 720             !nested_cpu_has_posted_intr(vmcs12))
 721                 return 0;
 722
 723         /*
 724          * If virtualize x2apic mode is enabled,
 725          * virtualize apic access must be disabled.
 726          */
 727         if (CC(nested_cpu_has_virt_x2apic_mode(vmcs12) &&
 728                nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)))
 729                 return -EINVAL;
 730
 731         /*
 732          * If virtual interrupt delivery is enabled,
 733          * we must exit on external interrupts.
 734          */
 735         if (CC(nested_cpu_has_vid(vmcs12) && !nested_exit_on_intr(vcpu)))
 736                 return -EINVAL;
 737
 738         /*
 739          * bits 15:8 should be zero in posted_intr_nv,
 740          * the descriptor address has been already checked
 741          * in nested_get_vmcs12_pages.
 742          *
 743          * bits 5:0 of posted_intr_desc_addr should be zero.
 744          */
 745         if (nested_cpu_has_posted_intr(vmcs12) &&
 746            (CC(!nested_cpu_has_vid(vmcs12)) ||
 747             CC(!nested_exit_intr_ack_set(vcpu)) ||
 748             CC((vmcs12->posted_intr_nv & 0xff00)) ||
 749             CC(!kvm_vcpu_is_legal_aligned_gpa(vcpu, vmcs12->posted_intr_desc_addr, 64))))
 750                 return -EINVAL;
 751
 752         /* tpr shadow is needed by all apicv features. */
 753         if (CC(!nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)))
 754                 return -EINVAL;
 755
 756         return 0;
 757 }
 758
 759 static int nested_vmx_check_msr_switch(struct kvm_vcpu *vcpu,
 760                                        u32 count, u64 addr)
 761 {
 762         if (count == 0)
 763                 return 0;
 764
 765         if (!kvm_vcpu_is_legal_aligned_gpa(vcpu, addr, 16) ||
 766             !kvm_vcpu_is_legal_gpa(vcpu, (addr + count * sizeof(struct vmx_msr_entry) - 1)))
 767                 return -EINVAL;
 768
 769         return 0;
 770 }
 771
 772 static int nested_vmx_check_exit_msr_switch_controls(struct kvm_vcpu *vcpu,
 773                                                      struct vmcs12 *vmcs12)
 774 {
 775         if (CC(nested_vmx_check_msr_switch(vcpu,
 776                                            vmcs12->vm_exit_msr_load_count,
 777                                            vmcs12->vm_exit_msr_load_addr)) ||
 778             CC(nested_vmx_check_msr_switch(vcpu,
 779                                            vmcs12->vm_exit_msr_store_count,
 780                                            vmcs12->vm_exit_msr_store_addr)))
 781                 return -EINVAL;
 782
 783         return 0;
 784 }
 785
 786 static int nested_vmx_check_entry_msr_switch_controls(struct kvm_vcpu *vcpu,
 787                                                       struct vmcs12 *vmcs12)
 788 {
 789         if (CC(nested_vmx_check_msr_switch(vcpu,
 790                                            vmcs12->vm_entry_msr_load_count,
 791                                            vmcs12->vm_entry_msr_load_addr)))
 792                 return -EINVAL;
 793
 794         return 0;
 795 }
 796
 797 static int nested_vmx_check_pml_controls(struct kvm_vcpu *vcpu,
 798                                          struct vmcs12 *vmcs12)
 799 {
 800         if (!nested_cpu_has_pml(vmcs12))
 801                 return 0;
 802
 803         if (CC(!nested_cpu_has_ept(vmcs12)) ||
 804             CC(!page_address_valid(vcpu, vmcs12->pml_address)))
 805                 return -EINVAL;
 806
 807         return 0;
 808 }
 809
 810 static int nested_vmx_check_unrestricted_guest_controls(struct kvm_vcpu *vcpu,
 811                                                         struct vmcs12 *vmcs12)
 812 {
 813         if (CC(nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST) &&
 814                !nested_cpu_has_ept(vmcs12)))
 815                 return -EINVAL;
 816         return 0;
 817 }
 818
 819 static int nested_vmx_check_mode_based_ept_exec_controls(struct kvm_vcpu *vcpu,
 820                                                          struct vmcs12 *vmcs12)
 821 {
 822         if (CC(nested_cpu_has2(vmcs12, SECONDARY_EXEC_MODE_BASED_EPT_EXEC) &&
 823                !nested_cpu_has_ept(vmcs12)))
 824                 return -EINVAL;
 825         return 0;
 826 }
 827
 828 static int nested_vmx_check_shadow_vmcs_controls(struct kvm_vcpu *vcpu,
 829                                                  struct vmcs12 *vmcs12)
 830 {
 831         if (!nested_cpu_has_shadow_vmcs(vmcs12))
 832                 return 0;
 833
 834         if (CC(!page_address_valid(vcpu, vmcs12->vmread_bitmap)) ||
 835             CC(!page_address_valid(vcpu, vmcs12->vmwrite_bitmap)))
 836                 return -EINVAL;
 837
 838         return 0;
 839 }
 840
 841 static int nested_vmx_msr_check_common(struct kvm_vcpu *vcpu,
 842                                        struct vmx_msr_entry *e)
 843 {
 844         /* x2APIC MSR accesses are not allowed */
 845         if (CC(vcpu->arch.apic_base & X2APIC_ENABLE && e->index >> 8 == 0x8))
 846                 return -EINVAL;
 847         if (CC(e->index == MSR_IA32_UCODE_WRITE) || /* SDM Table 35-2 */
 848             CC(e->index == MSR_IA32_UCODE_REV))
 849                 return -EINVAL;
 850         if (CC(e->reserved != 0))
 851                 return -EINVAL;
 852         return 0;
 853 }
 854
 855 static int nested_vmx_load_msr_check(struct kvm_vcpu *vcpu,
 856                                      struct vmx_msr_entry *e)
 857 {
 858         if (CC(e->index == MSR_FS_BASE) ||
 859             CC(e->index == MSR_GS_BASE) ||
 860             CC(e->index == MSR_IA32_SMM_MONITOR_CTL) || /* SMM is not supported */
 861             nested_vmx_msr_check_common(vcpu, e))
 862                 return -EINVAL;
 863         return 0;
 864 }
 865
 866 static int nested_vmx_store_msr_check(struct kvm_vcpu *vcpu,
 867                                       struct vmx_msr_entry *e)
 868 {
 869         if (CC(e->index == MSR_IA32_SMBASE) || /* SMM is not supported */
 870             nested_vmx_msr_check_common(vcpu, e))
 871                 return -EINVAL;
 872         return 0;
 873 }
 874
 875 static u32 nested_vmx_max_atomic_switch_msrs(struct kvm_vcpu *vcpu)
 876 {
 877         struct vcpu_vmx *vmx = to_vmx(vcpu);
 878         u64 vmx_misc = vmx_control_msr(vmx->nested.msrs.misc_low,
 879                                        vmx->nested.msrs.misc_high);
 880
 881         return (vmx_misc_max_msr(vmx_misc) + 1) * VMX_MISC_MSR_LIST_MULTIPLIER;
 882 }
 883
 884 /*
 885  * Load guest's/host's msr at nested entry/exit.
 886  * return 0 for success, entry index for failure.
 887  *
 888  * One of the failure modes for MSR load/store is when a list exceeds the
 889  * virtual hardware's capacity. To maintain compatibility with hardware inasmuch
 890  * as possible, process all valid entries before failing rather than precheck
 891  * for a capacity violation.
 892  */
 893 static u32 nested_vmx_load_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
 894 {
 895         u32 i;
 896         struct vmx_msr_entry e;
 897         u32 max_msr_list_size = nested_vmx_max_atomic_switch_msrs(vcpu);
 898
 899         for (i = 0; i < count; i++) {
 900                 if (unlikely(i >= max_msr_list_size))
 901                         goto fail;
 902
 903                 if (kvm_vcpu_read_guest(vcpu, gpa + i * sizeof(e),
 904                                         &e, sizeof(e))) {
 905                         pr_debug_ratelimited(
 906                                 "%s cannot read MSR entry (%u, 0x%08llx)\n",
 907                                 __func__, i, gpa + i * sizeof(e));
 908                         goto fail;
 909                 }
 910                 if (nested_vmx_load_msr_check(vcpu, &e)) {
 911                         pr_debug_ratelimited(
 912                                 "%s check failed (%u, 0x%x, 0x%x)\n",
 913                                 __func__, i, e.index, e.reserved);
 914                         goto fail;
 915                 }
 916                 if (kvm_set_msr(vcpu, e.index, e.value)) {
 917                         pr_debug_ratelimited(
 918                                 "%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
 919                                 __func__, i, e.index, e.value);
 920                         goto fail;
 921                 }
 922         }
 923         return 0;
 924 fail:
 925         /* Note, max_msr_list_size is at most 4096, i.e. this can't wrap. */
 926         return i + 1;
 927 }
 928
 929 static bool nested_vmx_get_vmexit_msr_value(struct kvm_vcpu *vcpu,
 930                                             u32 msr_index,
 931                                             u64 *data)
 932 {
 933         struct vcpu_vmx *vmx = to_vmx(vcpu);
 934
 935         /*
 936          * If the L0 hypervisor stored a more accurate value for the TSC that
 937          * does not include the time taken for emulation of the L2->L1
 938          * VM-exit in L0, use the more accurate value.
 939          */
 940         if (msr_index == MSR_IA32_TSC) {
 941                 int i = vmx_find_loadstore_msr_slot(&vmx->msr_autostore.guest,
 942                                                     MSR_IA32_TSC);
 943
 944                 if (i >= 0) {
 945                         u64 val = vmx->msr_autostore.guest.val[i].value;
 946
 947                         *data = kvm_read_l1_tsc(vcpu, val);
 948                         return true;
 949                 }
 950         }
 951
 952         if (kvm_get_msr(vcpu, msr_index, data)) {
 953                 pr_debug_ratelimited("%s cannot read MSR (0x%x)\n", __func__,
 954                         msr_index);
 955                 return false;
 956         }
 957         return true;
 958 }
 959
 960 static bool read_and_check_msr_entry(struct kvm_vcpu *vcpu, u64 gpa, int i,
 961                                      struct vmx_msr_entry *e)
 962 {
 963         if (kvm_vcpu_read_guest(vcpu,
 964                                 gpa + i * sizeof(*e),
 965                                 e, 2 * sizeof(u32))) {
 966                 pr_debug_ratelimited(
 967                         "%s cannot read MSR entry (%u, 0x%08llx)\n",
 968                         __func__, i, gpa + i * sizeof(*e));
 969                 return false;
 970         }
 971         if (nested_vmx_store_msr_check(vcpu, e)) {
 972                 pr_debug_ratelimited(
 973                         "%s check failed (%u, 0x%x, 0x%x)\n",
 974                         __func__, i, e->index, e->reserved);
 975                 return false;
 976         }
 977         return true;
 978 }
 979
 980 static int nested_vmx_store_msr(struct kvm_vcpu *vcpu, u64 gpa, u32 count)
 981 {
 982         u64 data;
 983         u32 i;
 984         struct vmx_msr_entry e;
 985         u32 max_msr_list_size = nested_vmx_max_atomic_switch_msrs(vcpu);
 986
 987         for (i = 0; i < count; i++) {
 988                 if (unlikely(i >= max_msr_list_size))
 989                         return -EINVAL;
 990
 991                 if (!read_and_check_msr_entry(vcpu, gpa, i, &e))
 992                         return -EINVAL;
 993
 994                 if (!nested_vmx_get_vmexit_msr_value(vcpu, e.index, &data))
 995                         return -EINVAL;
 996
 997                 if (kvm_vcpu_write_guest(vcpu,
 998                                          gpa + i * sizeof(e) +
 999                                              offsetof(struct vmx_msr_entry, value),
1000                                          &data, sizeof(data))) {
1001                         pr_debug_ratelimited(
1002                                 "%s cannot write MSR (%u, 0x%x, 0x%llx)\n",
1003                                 __func__, i, e.index, data);
1004                         return -EINVAL;
1005                 }
1006         }
1007         return 0;
1008 }
1009
1010 static bool nested_msr_store_list_has_msr(struct kvm_vcpu *vcpu, u32 msr_index)
1011 {
1012         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
1013         u32 count = vmcs12->vm_exit_msr_store_count;
1014         u64 gpa = vmcs12->vm_exit_msr_store_addr;
1015         struct vmx_msr_entry e;
1016         u32 i;
1017
1018         for (i = 0; i < count; i++) {
1019                 if (!read_and_check_msr_entry(vcpu, gpa, i, &e))
1020                         return false;
1021
1022                 if (e.index == msr_index)
1023                         return true;
1024         }
1025         return false;
1026 }
1027
1028 static void prepare_vmx_msr_autostore_list(struct kvm_vcpu *vcpu,
1029                                            u32 msr_index)
1030 {
1031         struct vcpu_vmx *vmx = to_vmx(vcpu);
1032         struct vmx_msrs *autostore = &vmx->msr_autostore.guest;
1033         bool in_vmcs12_store_list;
1034         int msr_autostore_slot;
1035         bool in_autostore_list;
1036         int last;
1037
1038         msr_autostore_slot = vmx_find_loadstore_msr_slot(autostore, msr_index);
1039         in_autostore_list = msr_autostore_slot >= 0;
1040         in_vmcs12_store_list = nested_msr_store_list_has_msr(vcpu, msr_index);
1041
1042         if (in_vmcs12_store_list && !in_autostore_list) {
1043                 if (autostore->nr == MAX_NR_LOADSTORE_MSRS) {
1044                         /*
1045                          * Emulated VMEntry does not fail here.  Instead a less
1046                          * accurate value will be returned by
1047                          * nested_vmx_get_vmexit_msr_value() using kvm_get_msr()
1048                          * instead of reading the value from the vmcs02 VMExit
1049                          * MSR-store area.
1050                          */
1051                         pr_warn_ratelimited(
1052                                 "Not enough msr entries in msr_autostore.  Can't add msr %x\n",
1053                                 msr_index);
1054                         return;
1055                 }
1056                 last = autostore->nr++;
1057                 autostore->val[last].index = msr_index;
1058         } else if (!in_vmcs12_store_list && in_autostore_list) {
1059                 last = --autostore->nr;
1060                 autostore->val[msr_autostore_slot] = autostore->val[last];
1061         }
1062 }
1063
1064 /*
1065  * Load guest's/host's cr3 at nested entry/exit.  @nested_ept is true if we are
1066  * emulating VM-Entry into a guest with EPT enabled.  On failure, the expected
1067  * Exit Qualification (for a VM-Entry consistency check VM-Exit) is assigned to
1068  * @entry_failure_code.
1069  */
1070 static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3,
1071                                bool nested_ept, bool reload_pdptrs,
1072                                enum vm_entry_failure_code *entry_failure_code)
1073 {
1074         if (CC(kvm_vcpu_is_illegal_gpa(vcpu, cr3))) {
1075                 *entry_failure_code = ENTRY_FAIL_DEFAULT;
1076                 return -EINVAL;
1077         }
1078
1079         /*
1080          * If PAE paging and EPT are both on, CR3 is not used by the CPU and
1081          * must not be dereferenced.
1082          */
1083         if (reload_pdptrs && !nested_ept && is_pae_paging(vcpu) &&
1084             CC(!load_pdptrs(vcpu, cr3))) {
1085                 *entry_failure_code = ENTRY_FAIL_PDPTE;
1086                 return -EINVAL;
1087         }
1088
1089         vcpu->arch.cr3 = cr3;
1090         kvm_register_mark_dirty(vcpu, VCPU_EXREG_CR3);
1091
1092         /* Re-initialize the MMU, e.g. to pick up CR4 MMU role changes. */
1093         kvm_init_mmu(vcpu);
1094
1095         if (!nested_ept)
1096                 kvm_mmu_new_pgd(vcpu, cr3);
1097
1098         return 0;
1099 }
1100
1101 /*
1102  * Returns if KVM is able to config CPU to tag TLB entries
1103  * populated by L2 differently than TLB entries populated
1104  * by L1.
1105  *
1106  * If L0 uses EPT, L1 and L2 run with different EPTP because
1107  * guest_mode is part of kvm_mmu_page_role. Thus, TLB entries
1108  * are tagged with different EPTP.
1109  *
1110  * If L1 uses VPID and we allocated a vpid02, TLB entries are tagged
1111  * with different VPID (L1 entries are tagged with vmx->vpid
1112  * while L2 entries are tagged with vmx->nested.vpid02).
1113  */
1114 static bool nested_has_guest_tlb_tag(struct kvm_vcpu *vcpu)
1115 {
1116         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
1117
1118         return enable_ept ||
1119                (nested_cpu_has_vpid(vmcs12) && to_vmx(vcpu)->nested.vpid02);
1120 }
1121
1122 static void nested_vmx_transition_tlb_flush(struct kvm_vcpu *vcpu,
1123                                             struct vmcs12 *vmcs12,
1124                                             bool is_vmenter)
1125 {
1126         struct vcpu_vmx *vmx = to_vmx(vcpu);
1127
1128         /*
1129          * If vmcs12 doesn't use VPID, L1 expects linear and combined mappings
1130          * for *all* contexts to be flushed on VM-Enter/VM-Exit, i.e. it's a
1131          * full TLB flush from the guest's perspective.  This is required even
1132          * if VPID is disabled in the host as KVM may need to synchronize the
1133          * MMU in response to the guest TLB flush.
1134          *
1135          * Note, using TLB_FLUSH_GUEST is correct even if nested EPT is in use.
1136          * EPT is a special snowflake, as guest-physical mappings aren't
1137          * flushed on VPID invalidations, including VM-Enter or VM-Exit with
1138          * VPID disabled.  As a result, KVM _never_ needs to sync nEPT
1139          * entries on VM-Enter because L1 can't rely on VM-Enter to flush
1140          * those mappings.
1141          */
1142         if (!nested_cpu_has_vpid(vmcs12)) {
1143                 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
1144                 return;
1145         }
1146
1147         /* L2 should never have a VPID if VPID is disabled. */
1148         WARN_ON(!enable_vpid);
1149
1150         /*
1151          * VPID is enabled and in use by vmcs12.  If vpid12 is changing, then
1152          * emulate a guest TLB flush as KVM does not track vpid12 history nor
1153          * is the VPID incorporated into the MMU context.  I.e. KVM must assume
1154          * that the new vpid12 has never been used and thus represents a new
1155          * guest ASID that cannot have entries in the TLB.
1156          */
1157         if (is_vmenter && vmcs12->virtual_processor_id != vmx->nested.last_vpid) {
1158                 vmx->nested.last_vpid = vmcs12->virtual_processor_id;
1159                 kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
1160                 return;
1161         }
1162
1163         /*
1164          * If VPID is enabled, used by vmc12, and vpid12 is not changing but
1165          * does not have a unique TLB tag (ASID), i.e. EPT is disabled and
1166          * KVM was unable to allocate a VPID for L2, flush the current context
1167          * as the effective ASID is common to both L1 and L2.
1168          */
1169         if (!nested_has_guest_tlb_tag(vcpu))
1170                 kvm_make_request(KVM_REQ_TLB_FLUSH_CURRENT, vcpu);
1171 }
1172
1173 static bool is_bitwise_subset(u64 superset, u64 subset, u64 mask)
1174 {
1175         superset &= mask;
1176         subset &= mask;
1177
1178         return (superset | subset) == superset;
1179 }
1180
1181 static int vmx_restore_vmx_basic(struct vcpu_vmx *vmx, u64 data)
1182 {
1183         const u64 feature_and_reserved =
1184                 /* feature (except bit 48; see below) */
1185                 BIT_ULL(49) | BIT_ULL(54) | BIT_ULL(55) |
1186                 /* reserved */
1187                 BIT_ULL(31) | GENMASK_ULL(47, 45) | GENMASK_ULL(63, 56);
1188         u64 vmx_basic = vmcs_config.nested.basic;
1189
1190         if (!is_bitwise_subset(vmx_basic, data, feature_and_reserved))
1191                 return -EINVAL;
1192
1193         /*
1194          * KVM does not emulate a version of VMX that constrains physical
1195          * addresses of VMX structures (e.g. VMCS) to 32-bits.
1196          */
1197         if (data & BIT_ULL(48))
1198                 return -EINVAL;
1199
1200         if (vmx_basic_vmcs_revision_id(vmx_basic) !=
1201             vmx_basic_vmcs_revision_id(data))
1202                 return -EINVAL;
1203
1204         if (vmx_basic_vmcs_size(vmx_basic) > vmx_basic_vmcs_size(data))
1205                 return -EINVAL;
1206
1207         vmx->nested.msrs.basic = data;
1208         return 0;
1209 }
1210
1211 static void vmx_get_control_msr(struct nested_vmx_msrs *msrs, u32 msr_index,
1212                                 u32 **low, u32 **high)
1213 {
1214         switch (msr_index) {
1215         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1216                 *low = &msrs->pinbased_ctls_low;
1217                 *high = &msrs->pinbased_ctls_high;
1218                 break;
1219         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1220                 *low = &msrs->procbased_ctls_low;
1221                 *high = &msrs->procbased_ctls_high;
1222                 break;
1223         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1224                 *low = &msrs->exit_ctls_low;
1225                 *high = &msrs->exit_ctls_high;
1226                 break;
1227         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1228                 *low = &msrs->entry_ctls_low;
1229                 *high = &msrs->entry_ctls_high;
1230                 break;
1231         case MSR_IA32_VMX_PROCBASED_CTLS2:
1232                 *low = &msrs->secondary_ctls_low;
1233                 *high = &msrs->secondary_ctls_high;
1234                 break;
1235         default:
1236                 BUG();
1237         }
1238 }
1239
1240 static int
1241 vmx_restore_control_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
1242 {
1243         u32 *lowp, *highp;
1244         u64 supported;
1245
1246         vmx_get_control_msr(&vmcs_config.nested, msr_index, &lowp, &highp);
1247
1248         supported = vmx_control_msr(*lowp, *highp);
1249
1250         /* Check must-be-1 bits are still 1. */
1251         if (!is_bitwise_subset(data, supported, GENMASK_ULL(31, 0)))
1252                 return -EINVAL;
1253
1254         /* Check must-be-0 bits are still 0. */
1255         if (!is_bitwise_subset(supported, data, GENMASK_ULL(63, 32)))
1256                 return -EINVAL;
1257
1258         vmx_get_control_msr(&vmx->nested.msrs, msr_index, &lowp, &highp);
1259         *lowp = data;
1260         *highp = data >> 32;
1261         return 0;
1262 }
1263
1264 static int vmx_restore_vmx_misc(struct vcpu_vmx *vmx, u64 data)
1265 {
1266         const u64 feature_and_reserved_bits =
1267                 /* feature */
1268                 BIT_ULL(5) | GENMASK_ULL(8, 6) | BIT_ULL(14) | BIT_ULL(15) |
1269                 BIT_ULL(28) | BIT_ULL(29) | BIT_ULL(30) |
1270                 /* reserved */
1271                 GENMASK_ULL(13, 9) | BIT_ULL(31);
1272         u64 vmx_misc = vmx_control_msr(vmcs_config.nested.misc_low,
1273                                        vmcs_config.nested.misc_high);
1274
1275         if (!is_bitwise_subset(vmx_misc, data, feature_and_reserved_bits))
1276                 return -EINVAL;
1277
1278         if ((vmx->nested.msrs.pinbased_ctls_high &
1279              PIN_BASED_VMX_PREEMPTION_TIMER) &&
1280             vmx_misc_preemption_timer_rate(data) !=
1281             vmx_misc_preemption_timer_rate(vmx_misc))
1282                 return -EINVAL;
1283
1284         if (vmx_misc_cr3_count(data) > vmx_misc_cr3_count(vmx_misc))
1285                 return -EINVAL;
1286
1287         if (vmx_misc_max_msr(data) > vmx_misc_max_msr(vmx_misc))
1288                 return -EINVAL;
1289
1290         if (vmx_misc_mseg_revid(data) != vmx_misc_mseg_revid(vmx_misc))
1291                 return -EINVAL;
1292
1293         vmx->nested.msrs.misc_low = data;
1294         vmx->nested.msrs.misc_high = data >> 32;
1295
1296         return 0;
1297 }
1298
1299 static int vmx_restore_vmx_ept_vpid_cap(struct vcpu_vmx *vmx, u64 data)
1300 {
1301         u64 vmx_ept_vpid_cap = vmx_control_msr(vmcs_config.nested.ept_caps,
1302                                                vmcs_config.nested.vpid_caps);
1303
1304         /* Every bit is either reserved or a feature bit. */
1305         if (!is_bitwise_subset(vmx_ept_vpid_cap, data, -1ULL))
1306                 return -EINVAL;
1307
1308         vmx->nested.msrs.ept_caps = data;
1309         vmx->nested.msrs.vpid_caps = data >> 32;
1310         return 0;
1311 }
1312
1313 static u64 *vmx_get_fixed0_msr(struct nested_vmx_msrs *msrs, u32 msr_index)
1314 {
1315         switch (msr_index) {
1316         case MSR_IA32_VMX_CR0_FIXED0:
1317                 return &msrs->cr0_fixed0;
1318         case MSR_IA32_VMX_CR4_FIXED0:
1319                 return &msrs->cr4_fixed0;
1320         default:
1321                 BUG();
1322         }
1323 }
1324
1325 static int vmx_restore_fixed0_msr(struct vcpu_vmx *vmx, u32 msr_index, u64 data)
1326 {
1327         const u64 *msr = vmx_get_fixed0_msr(&vmcs_config.nested, msr_index);
1328
1329         /*
1330          * 1 bits (which indicates bits which "must-be-1" during VMX operation)
1331          * must be 1 in the restored value.
1332          */
1333         if (!is_bitwise_subset(data, *msr, -1ULL))
1334                 return -EINVAL;
1335
1336         *vmx_get_fixed0_msr(&vmx->nested.msrs, msr_index) = data;
1337         return 0;
1338 }
1339
1340 /*
1341  * Called when userspace is restoring VMX MSRs.
1342  *
1343  * Returns 0 on success, non-0 otherwise.
1344  */
1345 int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1346 {
1347         struct vcpu_vmx *vmx = to_vmx(vcpu);
1348
1349         /*
1350          * Don't allow changes to the VMX capability MSRs while the vCPU
1351          * is in VMX operation.
1352          */
1353         if (vmx->nested.vmxon)
1354                 return -EBUSY;
1355
1356         switch (msr_index) {
1357         case MSR_IA32_VMX_BASIC:
1358                 return vmx_restore_vmx_basic(vmx, data);
1359         case MSR_IA32_VMX_PINBASED_CTLS:
1360         case MSR_IA32_VMX_PROCBASED_CTLS:
1361         case MSR_IA32_VMX_EXIT_CTLS:
1362         case MSR_IA32_VMX_ENTRY_CTLS:
1363                 /*
1364                  * The "non-true" VMX capability MSRs are generated from the
1365                  * "true" MSRs, so we do not support restoring them directly.
1366                  *
1367                  * If userspace wants to emulate VMX_BASIC[55]=0, userspace
1368                  * should restore the "true" MSRs with the must-be-1 bits
1369                  * set according to the SDM Vol 3. A.2 "RESERVED CONTROLS AND
1370                  * DEFAULT SETTINGS".
1371                  */
1372                 return -EINVAL;
1373         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1374         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1375         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1376         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1377         case MSR_IA32_VMX_PROCBASED_CTLS2:
1378                 return vmx_restore_control_msr(vmx, msr_index, data);
1379         case MSR_IA32_VMX_MISC:
1380                 return vmx_restore_vmx_misc(vmx, data);
1381         case MSR_IA32_VMX_CR0_FIXED0:
1382         case MSR_IA32_VMX_CR4_FIXED0:
1383                 return vmx_restore_fixed0_msr(vmx, msr_index, data);
1384         case MSR_IA32_VMX_CR0_FIXED1:
1385         case MSR_IA32_VMX_CR4_FIXED1:
1386                 /*
1387                  * These MSRs are generated based on the vCPU's CPUID, so we
1388                  * do not support restoring them directly.
1389                  */
1390                 return -EINVAL;
1391         case MSR_IA32_VMX_EPT_VPID_CAP:
1392                 return vmx_restore_vmx_ept_vpid_cap(vmx, data);
1393         case MSR_IA32_VMX_VMCS_ENUM:
1394                 vmx->nested.msrs.vmcs_enum = data;
1395                 return 0;
1396         case MSR_IA32_VMX_VMFUNC:
1397                 if (data & ~vmcs_config.nested.vmfunc_controls)
1398                         return -EINVAL;
1399                 vmx->nested.msrs.vmfunc_controls = data;
1400                 return 0;
1401         default:
1402                 /*
1403                  * The rest of the VMX capability MSRs do not support restore.
1404                  */
1405                 return -EINVAL;
1406         }
1407 }
1408
1409 /* Returns 0 on success, non-0 otherwise. */
1410 int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata)
1411 {
1412         switch (msr_index) {
1413         case MSR_IA32_VMX_BASIC:
1414                 *pdata = msrs->basic;
1415                 break;
1416         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1417         case MSR_IA32_VMX_PINBASED_CTLS:
1418                 *pdata = vmx_control_msr(
1419                         msrs->pinbased_ctls_low,
1420                         msrs->pinbased_ctls_high);
1421                 if (msr_index == MSR_IA32_VMX_PINBASED_CTLS)
1422                         *pdata |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
1423                 break;
1424         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1425         case MSR_IA32_VMX_PROCBASED_CTLS:
1426                 *pdata = vmx_control_msr(
1427                         msrs->procbased_ctls_low,
1428                         msrs->procbased_ctls_high);
1429                 if (msr_index == MSR_IA32_VMX_PROCBASED_CTLS)
1430                         *pdata |= CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
1431                 break;
1432         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1433         case MSR_IA32_VMX_EXIT_CTLS:
1434                 *pdata = vmx_control_msr(
1435                         msrs->exit_ctls_low,
1436                         msrs->exit_ctls_high);
1437                 if (msr_index == MSR_IA32_VMX_EXIT_CTLS)
1438                         *pdata |= VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
1439                 break;
1440         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1441         case MSR_IA32_VMX_ENTRY_CTLS:
1442                 *pdata = vmx_control_msr(
1443                         msrs->entry_ctls_low,
1444                         msrs->entry_ctls_high);
1445                 if (msr_index == MSR_IA32_VMX_ENTRY_CTLS)
1446                         *pdata |= VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
1447                 break;
1448         case MSR_IA32_VMX_MISC:
1449                 *pdata = vmx_control_msr(
1450                         msrs->misc_low,
1451                         msrs->misc_high);
1452                 break;
1453         case MSR_IA32_VMX_CR0_FIXED0:
1454                 *pdata = msrs->cr0_fixed0;
1455                 break;
1456         case MSR_IA32_VMX_CR0_FIXED1:
1457                 *pdata = msrs->cr0_fixed1;
1458                 break;
1459         case MSR_IA32_VMX_CR4_FIXED0:
1460                 *pdata = msrs->cr4_fixed0;
1461                 break;
1462         case MSR_IA32_VMX_CR4_FIXED1:
1463                 *pdata = msrs->cr4_fixed1;
1464                 break;
1465         case MSR_IA32_VMX_VMCS_ENUM:
1466                 *pdata = msrs->vmcs_enum;
1467                 break;
1468         case MSR_IA32_VMX_PROCBASED_CTLS2:
1469                 *pdata = vmx_control_msr(
1470                         msrs->secondary_ctls_low,
1471                         msrs->secondary_ctls_high);
1472                 break;
1473         case MSR_IA32_VMX_EPT_VPID_CAP:
1474                 *pdata = msrs->ept_caps |
1475                         ((u64)msrs->vpid_caps << 32);
1476                 break;
1477         case MSR_IA32_VMX_VMFUNC:
1478                 *pdata = msrs->vmfunc_controls;
1479                 break;
1480         default:
1481                 return 1;
1482         }
1483
1484         return 0;
1485 }
1486
1487 /*
1488  * Copy the writable VMCS shadow fields back to the VMCS12, in case they have
1489  * been modified by the L1 guest.  Note, "writable" in this context means
1490  * "writable by the guest", i.e. tagged SHADOW_FIELD_RW; the set of
1491  * fields tagged SHADOW_FIELD_RO may or may not align with the "read-only"
1492  * VM-exit information fields (which are actually writable if the vCPU is
1493  * configured to support "VMWRITE to any supported field in the VMCS").
1494  */
1495 static void copy_shadow_to_vmcs12(struct vcpu_vmx *vmx)
1496 {
1497         struct vmcs *shadow_vmcs = vmx->vmcs01.shadow_vmcs;
1498         struct vmcs12 *vmcs12 = get_vmcs12(&vmx->vcpu);
1499         struct shadow_vmcs_field field;
1500         unsigned long val;
1501         int i;
1502
1503         if (WARN_ON(!shadow_vmcs))
1504                 return;
1505
1506         preempt_disable();
1507
1508         vmcs_load(shadow_vmcs);
1509
1510         for (i = 0; i < max_shadow_read_write_fields; i++) {
1511                 field = shadow_read_write_fields[i];
1512                 val = __vmcs_readl(field.encoding);
1513                 vmcs12_write_any(vmcs12, field.encoding, field.offset, val);
1514         }
1515
1516         vmcs_clear(shadow_vmcs);
1517         vmcs_load(vmx->loaded_vmcs->vmcs);
1518
1519         preempt_enable();
1520 }
1521
1522 static void copy_vmcs12_to_shadow(struct vcpu_vmx *vmx)
1523 {
1524         const struct shadow_vmcs_field *fields[] = {
1525                 shadow_read_write_fields,
1526                 shadow_read_only_fields
1527         };
1528         const int max_fields[] = {
1529                 max_shadow_read_write_fields,
1530                 max_shadow_read_only_fields
1531         };
1532         struct vmcs *shadow_vmcs = vmx->vmcs01.shadow_vmcs;
1533         struct vmcs12 *vmcs12 = get_vmcs12(&vmx->vcpu);
1534         struct shadow_vmcs_field field;
1535         unsigned long val;
1536         int i, q;
1537
1538         if (WARN_ON(!shadow_vmcs))
1539                 return;
1540
1541         vmcs_load(shadow_vmcs);
1542
1543         for (q = 0; q < ARRAY_SIZE(fields); q++) {
1544                 for (i = 0; i < max_fields[q]; i++) {
1545                         field = fields[q][i];
1546                         val = vmcs12_read_any(vmcs12, field.encoding,
1547                                               field.offset);
1548                         __vmcs_writel(field.encoding, val);
1549                 }
1550         }
1551
1552         vmcs_clear(shadow_vmcs);
1553         vmcs_load(vmx->loaded_vmcs->vmcs);
1554 }
1555
1556 static void copy_enlightened_to_vmcs12(struct vcpu_vmx *vmx, u32 hv_clean_fields)
1557 {
1558         struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
1559         struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
1560
1561         /* HV_VMX_ENLIGHTENED_CLEAN_FIELD_NONE */
1562         vmcs12->tpr_threshold = evmcs->tpr_threshold;
1563         vmcs12->guest_rip = evmcs->guest_rip;
1564
1565         if (unlikely(!(hv_clean_fields &
1566                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_BASIC))) {
1567                 vmcs12->guest_rsp = evmcs->guest_rsp;
1568                 vmcs12->guest_rflags = evmcs->guest_rflags;
1569                 vmcs12->guest_interruptibility_info =
1570                         evmcs->guest_interruptibility_info;
1571                 /*
1572                  * Not present in struct vmcs12:
1573                  * vmcs12->guest_ssp = evmcs->guest_ssp;
1574                  */
1575         }
1576
1577         if (unlikely(!(hv_clean_fields &
1578                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_PROC))) {
1579                 vmcs12->cpu_based_vm_exec_control =
1580                         evmcs->cpu_based_vm_exec_control;
1581         }
1582
1583         if (unlikely(!(hv_clean_fields &
1584                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_EXCPN))) {
1585                 vmcs12->exception_bitmap = evmcs->exception_bitmap;
1586         }
1587
1588         if (unlikely(!(hv_clean_fields &
1589                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_ENTRY))) {
1590                 vmcs12->vm_entry_controls = evmcs->vm_entry_controls;
1591         }
1592
1593         if (unlikely(!(hv_clean_fields &
1594                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_EVENT))) {
1595                 vmcs12->vm_entry_intr_info_field =
1596                         evmcs->vm_entry_intr_info_field;
1597                 vmcs12->vm_entry_exception_error_code =
1598                         evmcs->vm_entry_exception_error_code;
1599                 vmcs12->vm_entry_instruction_len =
1600                         evmcs->vm_entry_instruction_len;
1601         }
1602
1603         if (unlikely(!(hv_clean_fields &
1604                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_GRP1))) {
1605                 vmcs12->host_ia32_pat = evmcs->host_ia32_pat;
1606                 vmcs12->host_ia32_efer = evmcs->host_ia32_efer;
1607                 vmcs12->host_cr0 = evmcs->host_cr0;
1608                 vmcs12->host_cr3 = evmcs->host_cr3;
1609                 vmcs12->host_cr4 = evmcs->host_cr4;
1610                 vmcs12->host_ia32_sysenter_esp = evmcs->host_ia32_sysenter_esp;
1611                 vmcs12->host_ia32_sysenter_eip = evmcs->host_ia32_sysenter_eip;
1612                 vmcs12->host_rip = evmcs->host_rip;
1613                 vmcs12->host_ia32_sysenter_cs = evmcs->host_ia32_sysenter_cs;
1614                 vmcs12->host_es_selector = evmcs->host_es_selector;
1615                 vmcs12->host_cs_selector = evmcs->host_cs_selector;
1616                 vmcs12->host_ss_selector = evmcs->host_ss_selector;
1617                 vmcs12->host_ds_selector = evmcs->host_ds_selector;
1618                 vmcs12->host_fs_selector = evmcs->host_fs_selector;
1619                 vmcs12->host_gs_selector = evmcs->host_gs_selector;
1620                 vmcs12->host_tr_selector = evmcs->host_tr_selector;
1621                 vmcs12->host_ia32_perf_global_ctrl = evmcs->host_ia32_perf_global_ctrl;
1622                 /*
1623                  * Not present in struct vmcs12:
1624                  * vmcs12->host_ia32_s_cet = evmcs->host_ia32_s_cet;
1625                  * vmcs12->host_ssp = evmcs->host_ssp;
1626                  * vmcs12->host_ia32_int_ssp_table_addr = evmcs->host_ia32_int_ssp_table_addr;
1627                  */
1628         }
1629
1630         if (unlikely(!(hv_clean_fields &
1631                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP1))) {
1632                 vmcs12->pin_based_vm_exec_control =
1633                         evmcs->pin_based_vm_exec_control;
1634                 vmcs12->vm_exit_controls = evmcs->vm_exit_controls;
1635                 vmcs12->secondary_vm_exec_control =
1636                         evmcs->secondary_vm_exec_control;
1637         }
1638
1639         if (unlikely(!(hv_clean_fields &
1640                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_IO_BITMAP))) {
1641                 vmcs12->io_bitmap_a = evmcs->io_bitmap_a;
1642                 vmcs12->io_bitmap_b = evmcs->io_bitmap_b;
1643         }
1644
1645         if (unlikely(!(hv_clean_fields &
1646                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_MSR_BITMAP))) {
1647                 vmcs12->msr_bitmap = evmcs->msr_bitmap;
1648         }
1649
1650         if (unlikely(!(hv_clean_fields &
1651                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2))) {
1652                 vmcs12->guest_es_base = evmcs->guest_es_base;
1653                 vmcs12->guest_cs_base = evmcs->guest_cs_base;
1654                 vmcs12->guest_ss_base = evmcs->guest_ss_base;
1655                 vmcs12->guest_ds_base = evmcs->guest_ds_base;
1656                 vmcs12->guest_fs_base = evmcs->guest_fs_base;
1657                 vmcs12->guest_gs_base = evmcs->guest_gs_base;
1658                 vmcs12->guest_ldtr_base = evmcs->guest_ldtr_base;
1659                 vmcs12->guest_tr_base = evmcs->guest_tr_base;
1660                 vmcs12->guest_gdtr_base = evmcs->guest_gdtr_base;
1661                 vmcs12->guest_idtr_base = evmcs->guest_idtr_base;
1662                 vmcs12->guest_es_limit = evmcs->guest_es_limit;
1663                 vmcs12->guest_cs_limit = evmcs->guest_cs_limit;
1664                 vmcs12->guest_ss_limit = evmcs->guest_ss_limit;
1665                 vmcs12->guest_ds_limit = evmcs->guest_ds_limit;
1666                 vmcs12->guest_fs_limit = evmcs->guest_fs_limit;
1667                 vmcs12->guest_gs_limit = evmcs->guest_gs_limit;
1668                 vmcs12->guest_ldtr_limit = evmcs->guest_ldtr_limit;
1669                 vmcs12->guest_tr_limit = evmcs->guest_tr_limit;
1670                 vmcs12->guest_gdtr_limit = evmcs->guest_gdtr_limit;
1671                 vmcs12->guest_idtr_limit = evmcs->guest_idtr_limit;
1672                 vmcs12->guest_es_ar_bytes = evmcs->guest_es_ar_bytes;
1673                 vmcs12->guest_cs_ar_bytes = evmcs->guest_cs_ar_bytes;
1674                 vmcs12->guest_ss_ar_bytes = evmcs->guest_ss_ar_bytes;
1675                 vmcs12->guest_ds_ar_bytes = evmcs->guest_ds_ar_bytes;
1676                 vmcs12->guest_fs_ar_bytes = evmcs->guest_fs_ar_bytes;
1677                 vmcs12->guest_gs_ar_bytes = evmcs->guest_gs_ar_bytes;
1678                 vmcs12->guest_ldtr_ar_bytes = evmcs->guest_ldtr_ar_bytes;
1679                 vmcs12->guest_tr_ar_bytes = evmcs->guest_tr_ar_bytes;
1680                 vmcs12->guest_es_selector = evmcs->guest_es_selector;
1681                 vmcs12->guest_cs_selector = evmcs->guest_cs_selector;
1682                 vmcs12->guest_ss_selector = evmcs->guest_ss_selector;
1683                 vmcs12->guest_ds_selector = evmcs->guest_ds_selector;
1684                 vmcs12->guest_fs_selector = evmcs->guest_fs_selector;
1685                 vmcs12->guest_gs_selector = evmcs->guest_gs_selector;
1686                 vmcs12->guest_ldtr_selector = evmcs->guest_ldtr_selector;
1687                 vmcs12->guest_tr_selector = evmcs->guest_tr_selector;
1688         }
1689
1690         if (unlikely(!(hv_clean_fields &
1691                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_GRP2))) {
1692                 vmcs12->tsc_offset = evmcs->tsc_offset;
1693                 vmcs12->virtual_apic_page_addr = evmcs->virtual_apic_page_addr;
1694                 vmcs12->xss_exit_bitmap = evmcs->xss_exit_bitmap;
1695                 vmcs12->encls_exiting_bitmap = evmcs->encls_exiting_bitmap;
1696                 vmcs12->tsc_multiplier = evmcs->tsc_multiplier;
1697         }
1698
1699         if (unlikely(!(hv_clean_fields &
1700                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CRDR))) {
1701                 vmcs12->cr0_guest_host_mask = evmcs->cr0_guest_host_mask;
1702                 vmcs12->cr4_guest_host_mask = evmcs->cr4_guest_host_mask;
1703                 vmcs12->cr0_read_shadow = evmcs->cr0_read_shadow;
1704                 vmcs12->cr4_read_shadow = evmcs->cr4_read_shadow;
1705                 vmcs12->guest_cr0 = evmcs->guest_cr0;
1706                 vmcs12->guest_cr3 = evmcs->guest_cr3;
1707                 vmcs12->guest_cr4 = evmcs->guest_cr4;
1708                 vmcs12->guest_dr7 = evmcs->guest_dr7;
1709         }
1710
1711         if (unlikely(!(hv_clean_fields &
1712                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_HOST_POINTER))) {
1713                 vmcs12->host_fs_base = evmcs->host_fs_base;
1714                 vmcs12->host_gs_base = evmcs->host_gs_base;
1715                 vmcs12->host_tr_base = evmcs->host_tr_base;
1716                 vmcs12->host_gdtr_base = evmcs->host_gdtr_base;
1717                 vmcs12->host_idtr_base = evmcs->host_idtr_base;
1718                 vmcs12->host_rsp = evmcs->host_rsp;
1719         }
1720
1721         if (unlikely(!(hv_clean_fields &
1722                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_CONTROL_XLAT))) {
1723                 vmcs12->ept_pointer = evmcs->ept_pointer;
1724                 vmcs12->virtual_processor_id = evmcs->virtual_processor_id;
1725         }
1726
1727         if (unlikely(!(hv_clean_fields &
1728                        HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1))) {
1729                 vmcs12->vmcs_link_pointer = evmcs->vmcs_link_pointer;
1730                 vmcs12->guest_ia32_debugctl = evmcs->guest_ia32_debugctl;
1731                 vmcs12->guest_ia32_pat = evmcs->guest_ia32_pat;
1732                 vmcs12->guest_ia32_efer = evmcs->guest_ia32_efer;
1733                 vmcs12->guest_pdptr0 = evmcs->guest_pdptr0;
1734                 vmcs12->guest_pdptr1 = evmcs->guest_pdptr1;
1735                 vmcs12->guest_pdptr2 = evmcs->guest_pdptr2;
1736                 vmcs12->guest_pdptr3 = evmcs->guest_pdptr3;
1737                 vmcs12->guest_pending_dbg_exceptions =
1738                         evmcs->guest_pending_dbg_exceptions;
1739                 vmcs12->guest_sysenter_esp = evmcs->guest_sysenter_esp;
1740                 vmcs12->guest_sysenter_eip = evmcs->guest_sysenter_eip;
1741                 vmcs12->guest_bndcfgs = evmcs->guest_bndcfgs;
1742                 vmcs12->guest_activity_state = evmcs->guest_activity_state;
1743                 vmcs12->guest_sysenter_cs = evmcs->guest_sysenter_cs;
1744                 vmcs12->guest_ia32_perf_global_ctrl = evmcs->guest_ia32_perf_global_ctrl;
1745                 /*
1746                  * Not present in struct vmcs12:
1747                  * vmcs12->guest_ia32_s_cet = evmcs->guest_ia32_s_cet;
1748                  * vmcs12->guest_ia32_lbr_ctl = evmcs->guest_ia32_lbr_ctl;
1749                  * vmcs12->guest_ia32_int_ssp_table_addr = evmcs->guest_ia32_int_ssp_table_addr;
1750                  */
1751         }
1752
1753         /*
1754          * Not used?
1755          * vmcs12->vm_exit_msr_store_addr = evmcs->vm_exit_msr_store_addr;
1756          * vmcs12->vm_exit_msr_load_addr = evmcs->vm_exit_msr_load_addr;
1757          * vmcs12->vm_entry_msr_load_addr = evmcs->vm_entry_msr_load_addr;
1758          * vmcs12->page_fault_error_code_mask =
1759          *              evmcs->page_fault_error_code_mask;
1760          * vmcs12->page_fault_error_code_match =
1761          *              evmcs->page_fault_error_code_match;
1762          * vmcs12->cr3_target_count = evmcs->cr3_target_count;
1763          * vmcs12->vm_exit_msr_store_count = evmcs->vm_exit_msr_store_count;
1764          * vmcs12->vm_exit_msr_load_count = evmcs->vm_exit_msr_load_count;
1765          * vmcs12->vm_entry_msr_load_count = evmcs->vm_entry_msr_load_count;
1766          */
1767
1768         /*
1769          * Read only fields:
1770          * vmcs12->guest_physical_address = evmcs->guest_physical_address;
1771          * vmcs12->vm_instruction_error = evmcs->vm_instruction_error;
1772          * vmcs12->vm_exit_reason = evmcs->vm_exit_reason;
1773          * vmcs12->vm_exit_intr_info = evmcs->vm_exit_intr_info;
1774          * vmcs12->vm_exit_intr_error_code = evmcs->vm_exit_intr_error_code;
1775          * vmcs12->idt_vectoring_info_field = evmcs->idt_vectoring_info_field;
1776          * vmcs12->idt_vectoring_error_code = evmcs->idt_vectoring_error_code;
1777          * vmcs12->vm_exit_instruction_len = evmcs->vm_exit_instruction_len;
1778          * vmcs12->vmx_instruction_info = evmcs->vmx_instruction_info;
1779          * vmcs12->exit_qualification = evmcs->exit_qualification;
1780          * vmcs12->guest_linear_address = evmcs->guest_linear_address;
1781          *
1782          * Not present in struct vmcs12:
1783          * vmcs12->exit_io_instruction_ecx = evmcs->exit_io_instruction_ecx;
1784          * vmcs12->exit_io_instruction_esi = evmcs->exit_io_instruction_esi;
1785          * vmcs12->exit_io_instruction_edi = evmcs->exit_io_instruction_edi;
1786          * vmcs12->exit_io_instruction_eip = evmcs->exit_io_instruction_eip;
1787          */
1788
1789         return;
1790 }
1791
1792 static void copy_vmcs12_to_enlightened(struct vcpu_vmx *vmx)
1793 {
1794         struct vmcs12 *vmcs12 = vmx->nested.cached_vmcs12;
1795         struct hv_enlightened_vmcs *evmcs = vmx->nested.hv_evmcs;
1796
1797         /*
1798          * Should not be changed by KVM:
1799          *
1800          * evmcs->host_es_selector = vmcs12->host_es_selector;
1801          * evmcs->host_cs_selector = vmcs12->host_cs_selector;
1802          * evmcs->host_ss_selector = vmcs12->host_ss_selector;
1803          * evmcs->host_ds_selector = vmcs12->host_ds_selector;
1804          * evmcs->host_fs_selector = vmcs12->host_fs_selector;
1805          * evmcs->host_gs_selector = vmcs12->host_gs_selector;
1806          * evmcs->host_tr_selector = vmcs12->host_tr_selector;
1807          * evmcs->host_ia32_pat = vmcs12->host_ia32_pat;
1808          * evmcs->host_ia32_efer = vmcs12->host_ia32_efer;
1809          * evmcs->host_cr0 = vmcs12->host_cr0;
1810          * evmcs->host_cr3 = vmcs12->host_cr3;
1811          * evmcs->host_cr4 = vmcs12->host_cr4;
1812          * evmcs->host_ia32_sysenter_esp = vmcs12->host_ia32_sysenter_esp;
1813          * evmcs->host_ia32_sysenter_eip = vmcs12->host_ia32_sysenter_eip;
1814          * evmcs->host_rip = vmcs12->host_rip;
1815          * evmcs->host_ia32_sysenter_cs = vmcs12->host_ia32_sysenter_cs;
1816          * evmcs->host_fs_base = vmcs12->host_fs_base;
1817          * evmcs->host_gs_base = vmcs12->host_gs_base;
1818          * evmcs->host_tr_base = vmcs12->host_tr_base;
1819          * evmcs->host_gdtr_base = vmcs12->host_gdtr_base;
1820          * evmcs->host_idtr_base = vmcs12->host_idtr_base;
1821          * evmcs->host_rsp = vmcs12->host_rsp;
1822          * sync_vmcs02_to_vmcs12() doesn't read these:
1823          * evmcs->io_bitmap_a = vmcs12->io_bitmap_a;
1824          * evmcs->io_bitmap_b = vmcs12->io_bitmap_b;
1825          * evmcs->msr_bitmap = vmcs12->msr_bitmap;
1826          * evmcs->ept_pointer = vmcs12->ept_pointer;
1827          * evmcs->xss_exit_bitmap = vmcs12->xss_exit_bitmap;
1828          * evmcs->vm_exit_msr_store_addr = vmcs12->vm_exit_msr_store_addr;
1829          * evmcs->vm_exit_msr_load_addr = vmcs12->vm_exit_msr_load_addr;
1830          * evmcs->vm_entry_msr_load_addr = vmcs12->vm_entry_msr_load_addr;
1831          * evmcs->tpr_threshold = vmcs12->tpr_threshold;
1832          * evmcs->virtual_processor_id = vmcs12->virtual_processor_id;
1833          * evmcs->exception_bitmap = vmcs12->exception_bitmap;
1834          * evmcs->vmcs_link_pointer = vmcs12->vmcs_link_pointer;
1835          * evmcs->pin_based_vm_exec_control = vmcs12->pin_based_vm_exec_control;
1836          * evmcs->vm_exit_controls = vmcs12->vm_exit_controls;
1837          * evmcs->secondary_vm_exec_control = vmcs12->secondary_vm_exec_control;
1838          * evmcs->page_fault_error_code_mask =
1839          *              vmcs12->page_fault_error_code_mask;
1840          * evmcs->page_fault_error_code_match =
1841          *              vmcs12->page_fault_error_code_match;
1842          * evmcs->cr3_target_count = vmcs12->cr3_target_count;
1843          * evmcs->virtual_apic_page_addr = vmcs12->virtual_apic_page_addr;
1844          * evmcs->tsc_offset = vmcs12->tsc_offset;
1845          * evmcs->guest_ia32_debugctl = vmcs12->guest_ia32_debugctl;
1846          * evmcs->cr0_guest_host_mask = vmcs12->cr0_guest_host_mask;
1847          * evmcs->cr4_guest_host_mask = vmcs12->cr4_guest_host_mask;
1848          * evmcs->cr0_read_shadow = vmcs12->cr0_read_shadow;
1849          * evmcs->cr4_read_shadow = vmcs12->cr4_read_shadow;
1850          * evmcs->vm_exit_msr_store_count = vmcs12->vm_exit_msr_store_count;
1851          * evmcs->vm_exit_msr_load_count = vmcs12->vm_exit_msr_load_count;
1852          * evmcs->vm_entry_msr_load_count = vmcs12->vm_entry_msr_load_count;
1853          * evmcs->guest_ia32_perf_global_ctrl = vmcs12->guest_ia32_perf_global_ctrl;
1854          * evmcs->host_ia32_perf_global_ctrl = vmcs12->host_ia32_perf_global_ctrl;
1855          * evmcs->encls_exiting_bitmap = vmcs12->encls_exiting_bitmap;
1856          * evmcs->tsc_multiplier = vmcs12->tsc_multiplier;
1857          *
1858          * Not present in struct vmcs12:
1859          * evmcs->exit_io_instruction_ecx = vmcs12->exit_io_instruction_ecx;
1860          * evmcs->exit_io_instruction_esi = vmcs12->exit_io_instruction_esi;
1861          * evmcs->exit_io_instruction_edi = vmcs12->exit_io_instruction_edi;
1862          * evmcs->exit_io_instruction_eip = vmcs12->exit_io_instruction_eip;
1863          * evmcs->host_ia32_s_cet = vmcs12->host_ia32_s_cet;
1864          * evmcs->host_ssp = vmcs12->host_ssp;
1865          * evmcs->host_ia32_int_ssp_table_addr = vmcs12->host_ia32_int_ssp_table_addr;
1866          * evmcs->guest_ia32_s_cet = vmcs12->guest_ia32_s_cet;
1867          * evmcs->guest_ia32_lbr_ctl = vmcs12->guest_ia32_lbr_ctl;
1868          * evmcs->guest_ia32_int_ssp_table_addr = vmcs12->guest_ia32_int_ssp_table_addr;
1869          * evmcs->guest_ssp = vmcs12->guest_ssp;
1870          */
1871
1872         evmcs->guest_es_selector = vmcs12->guest_es_selector;
1873         evmcs->guest_cs_selector = vmcs12->guest_cs_selector;
1874         evmcs->guest_ss_selector = vmcs12->guest_ss_selector;
1875         evmcs->guest_ds_selector = vmcs12->guest_ds_selector;
1876         evmcs->guest_fs_selector = vmcs12->guest_fs_selector;
1877         evmcs->guest_gs_selector = vmcs12->guest_gs_selector;
1878         evmcs->guest_ldtr_selector = vmcs12->guest_ldtr_selector;
1879         evmcs->guest_tr_selector = vmcs12->guest_tr_selector;
1880
1881         evmcs->guest_es_limit = vmcs12->guest_es_limit;
1882         evmcs->guest_cs_limit = vmcs12->guest_cs_limit;
1883         evmcs->guest_ss_limit = vmcs12->guest_ss_limit;
1884         evmcs->guest_ds_limit = vmcs12->guest_ds_limit;
1885         evmcs->guest_fs_limit = vmcs12->guest_fs_limit;
1886         evmcs->guest_gs_limit = vmcs12->guest_gs_limit;
1887         evmcs->guest_ldtr_limit = vmcs12->guest_ldtr_limit;
1888         evmcs->guest_tr_limit = vmcs12->guest_tr_limit;
1889         evmcs->guest_gdtr_limit = vmcs12->guest_gdtr_limit;
1890         evmcs->guest_idtr_limit = vmcs12->guest_idtr_limit;
1891
1892         evmcs->guest_es_ar_bytes = vmcs12->guest_es_ar_bytes;
1893         evmcs->guest_cs_ar_bytes = vmcs12->guest_cs_ar_bytes;
1894         evmcs->guest_ss_ar_bytes = vmcs12->guest_ss_ar_bytes;
1895         evmcs->guest_ds_ar_bytes = vmcs12->guest_ds_ar_bytes;
1896         evmcs->guest_fs_ar_bytes = vmcs12->guest_fs_ar_bytes;
1897         evmcs->guest_gs_ar_bytes = vmcs12->guest_gs_ar_bytes;
1898         evmcs->guest_ldtr_ar_bytes = vmcs12->guest_ldtr_ar_bytes;
1899         evmcs->guest_tr_ar_bytes = vmcs12->guest_tr_ar_bytes;
1900
1901         evmcs->guest_es_base = vmcs12->guest_es_base;
1902         evmcs->guest_cs_base = vmcs12->guest_cs_base;
1903         evmcs->guest_ss_base = vmcs12->guest_ss_base;
1904         evmcs->guest_ds_base = vmcs12->guest_ds_base;
1905         evmcs->guest_fs_base = vmcs12->guest_fs_base;
1906         evmcs->guest_gs_base = vmcs12->guest_gs_base;
1907         evmcs->guest_ldtr_base = vmcs12->guest_ldtr_base;
1908         evmcs->guest_tr_base = vmcs12->guest_tr_base;
1909         evmcs->guest_gdtr_base = vmcs12->guest_gdtr_base;
1910         evmcs->guest_idtr_base = vmcs12->guest_idtr_base;
1911
1912         evmcs->guest_ia32_pat = vmcs12->guest_ia32_pat;
1913         evmcs->guest_ia32_efer = vmcs12->guest_ia32_efer;
1914
1915         evmcs->guest_pdptr0 = vmcs12->guest_pdptr0;
1916         evmcs->guest_pdptr1 = vmcs12->guest_pdptr1;
1917         evmcs->guest_pdptr2 = vmcs12->guest_pdptr2;
1918         evmcs->guest_pdptr3 = vmcs12->guest_pdptr3;
1919
1920         evmcs->guest_pending_dbg_exceptions =
1921                 vmcs12->guest_pending_dbg_exceptions;
1922         evmcs->guest_sysenter_esp = vmcs12->guest_sysenter_esp;
1923         evmcs->guest_sysenter_eip = vmcs12->guest_sysenter_eip;
1924
1925         evmcs->guest_activity_state = vmcs12->guest_activity_state;
1926         evmcs->guest_sysenter_cs = vmcs12->guest_sysenter_cs;
1927
1928         evmcs->guest_cr0 = vmcs12->guest_cr0;
1929         evmcs->guest_cr3 = vmcs12->guest_cr3;
1930         evmcs->guest_cr4 = vmcs12->guest_cr4;
1931         evmcs->guest_dr7 = vmcs12->guest_dr7;
1932
1933         evmcs->guest_physical_address = vmcs12->guest_physical_address;
1934
1935         evmcs->vm_instruction_error = vmcs12->vm_instruction_error;
1936         evmcs->vm_exit_reason = vmcs12->vm_exit_reason;
1937         evmcs->vm_exit_intr_info = vmcs12->vm_exit_intr_info;
1938         evmcs->vm_exit_intr_error_code = vmcs12->vm_exit_intr_error_code;
1939         evmcs->idt_vectoring_info_field = vmcs12->idt_vectoring_info_field;
1940         evmcs->idt_vectoring_error_code = vmcs12->idt_vectoring_error_code;
1941         evmcs->vm_exit_instruction_len = vmcs12->vm_exit_instruction_len;
1942         evmcs->vmx_instruction_info = vmcs12->vmx_instruction_info;
1943
1944         evmcs->exit_qualification = vmcs12->exit_qualification;
1945
1946         evmcs->guest_linear_address = vmcs12->guest_linear_address;
1947         evmcs->guest_rsp = vmcs12->guest_rsp;
1948         evmcs->guest_rflags = vmcs12->guest_rflags;
1949
1950         evmcs->guest_interruptibility_info =
1951                 vmcs12->guest_interruptibility_info;
1952         evmcs->cpu_based_vm_exec_control = vmcs12->cpu_based_vm_exec_control;
1953         evmcs->vm_entry_controls = vmcs12->vm_entry_controls;
1954         evmcs->vm_entry_intr_info_field = vmcs12->vm_entry_intr_info_field;
1955         evmcs->vm_entry_exception_error_code =
1956                 vmcs12->vm_entry_exception_error_code;
1957         evmcs->vm_entry_instruction_len = vmcs12->vm_entry_instruction_len;
1958
1959         evmcs->guest_rip = vmcs12->guest_rip;
1960
1961         evmcs->guest_bndcfgs = vmcs12->guest_bndcfgs;
1962
1963         return;
1964 }
1965
1966 /*
1967  * This is an equivalent of the nested hypervisor executing the vmptrld
1968  * instruction.
1969  */
1970 static enum nested_evmptrld_status nested_vmx_handle_enlightened_vmptrld(
1971         struct kvm_vcpu *vcpu, bool from_launch)
1972 {
1973         struct vcpu_vmx *vmx = to_vmx(vcpu);
1974         bool evmcs_gpa_changed = false;
1975         u64 evmcs_gpa;
1976
1977         if (likely(!guest_cpuid_has_evmcs(vcpu)))
1978                 return EVMPTRLD_DISABLED;
1979
1980         if (!nested_enlightened_vmentry(vcpu, &evmcs_gpa)) {
1981                 nested_release_evmcs(vcpu);
1982                 return EVMPTRLD_DISABLED;
1983         }
1984
1985         if (unlikely(evmcs_gpa != vmx->nested.hv_evmcs_vmptr)) {
1986                 vmx->nested.current_vmptr = INVALID_GPA;
1987
1988                 nested_release_evmcs(vcpu);
1989
1990                 if (kvm_vcpu_map(vcpu, gpa_to_gfn(evmcs_gpa),
1991                                  &vmx->nested.hv_evmcs_map))
1992                         return EVMPTRLD_ERROR;
1993
1994                 vmx->nested.hv_evmcs = vmx->nested.hv_evmcs_map.hva;
1995
1996                 /*
1997                  * Currently, KVM only supports eVMCS version 1
1998                  * (== KVM_EVMCS_VERSION) and thus we expect guest to set this
1999                  * value to first u32 field of eVMCS which should specify eVMCS
2000                  * VersionNumber.
2001                  *
2002                  * Guest should be aware of supported eVMCS versions by host by
2003                  * examining CPUID.0x4000000A.EAX[0:15]. Host userspace VMM is
2004                  * expected to set this CPUID leaf according to the value
2005                  * returned in vmcs_version from nested_enable_evmcs().
2006                  *
2007                  * However, it turns out that Microsoft Hyper-V fails to comply
2008                  * to their own invented interface: When Hyper-V use eVMCS, it
2009                  * just sets first u32 field of eVMCS to revision_id specified
2010                  * in MSR_IA32_VMX_BASIC. Instead of used eVMCS version number
2011                  * which is one of the supported versions specified in
2012                  * CPUID.0x4000000A.EAX[0:15].
2013                  *
2014                  * To overcome Hyper-V bug, we accept here either a supported
2015                  * eVMCS version or VMCS12 revision_id as valid values for first
2016                  * u32 field of eVMCS.
2017                  */
2018                 if ((vmx->nested.hv_evmcs->revision_id != KVM_EVMCS_VERSION) &&
2019                     (vmx->nested.hv_evmcs->revision_id != VMCS12_REVISION)) {
2020                         nested_release_evmcs(vcpu);
2021                         return EVMPTRLD_VMFAIL;
2022                 }
2023
2024                 vmx->nested.hv_evmcs_vmptr = evmcs_gpa;
2025
2026                 evmcs_gpa_changed = true;
2027                 /*
2028                  * Unlike normal vmcs12, enlightened vmcs12 is not fully
2029                  * reloaded from guest's memory (read only fields, fields not
2030                  * present in struct hv_enlightened_vmcs, ...). Make sure there
2031                  * are no leftovers.
2032                  */
2033                 if (from_launch) {
2034                         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
2035                         memset(vmcs12, 0, sizeof(*vmcs12));
2036                         vmcs12->hdr.revision_id = VMCS12_REVISION;
2037                 }
2038
2039         }
2040
2041         /*
2042          * Clean fields data can't be used on VMLAUNCH and when we switch
2043          * between different L2 guests as KVM keeps a single VMCS12 per L1.
2044          */
2045         if (from_launch || evmcs_gpa_changed) {
2046                 vmx->nested.hv_evmcs->hv_clean_fields &=
2047                         ~HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
2048
2049                 vmx->nested.force_msr_bitmap_recalc = true;
2050         }
2051
2052         return EVMPTRLD_SUCCEEDED;
2053 }
2054
2055 void nested_sync_vmcs12_to_shadow(struct kvm_vcpu *vcpu)
2056 {
2057         struct vcpu_vmx *vmx = to_vmx(vcpu);
2058
2059         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
2060                 copy_vmcs12_to_enlightened(vmx);
2061         else
2062                 copy_vmcs12_to_shadow(vmx);
2063
2064         vmx->nested.need_vmcs12_to_shadow_sync = false;
2065 }
2066
2067 static enum hrtimer_restart vmx_preemption_timer_fn(struct hrtimer *timer)
2068 {
2069         struct vcpu_vmx *vmx =
2070                 container_of(timer, struct vcpu_vmx, nested.preemption_timer);
2071
2072         vmx->nested.preemption_timer_expired = true;
2073         kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
2074         kvm_vcpu_kick(&vmx->vcpu);
2075
2076         return HRTIMER_NORESTART;
2077 }
2078
2079 static u64 vmx_calc_preemption_timer_value(struct kvm_vcpu *vcpu)
2080 {
2081         struct vcpu_vmx *vmx = to_vmx(vcpu);
2082         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
2083
2084         u64 l1_scaled_tsc = kvm_read_l1_tsc(vcpu, rdtsc()) >>
2085                             VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
2086
2087         if (!vmx->nested.has_preemption_timer_deadline) {
2088                 vmx->nested.preemption_timer_deadline =
2089                         vmcs12->vmx_preemption_timer_value + l1_scaled_tsc;
2090                 vmx->nested.has_preemption_timer_deadline = true;
2091         }
2092         return vmx->nested.preemption_timer_deadline - l1_scaled_tsc;
2093 }
2094
2095 static void vmx_start_preemption_timer(struct kvm_vcpu *vcpu,
2096                                         u64 preemption_timeout)
2097 {
2098         struct vcpu_vmx *vmx = to_vmx(vcpu);
2099
2100         /*
2101          * A timer value of zero is architecturally guaranteed to cause
2102          * a VMExit prior to executing any instructions in the guest.
2103          */
2104         if (preemption_timeout == 0) {
2105                 vmx_preemption_timer_fn(&vmx->nested.preemption_timer);
2106                 return;
2107         }
2108
2109         if (vcpu->arch.virtual_tsc_khz == 0)
2110                 return;
2111
2112         preemption_timeout <<= VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
2113         preemption_timeout *= 1000000;
2114         do_div(preemption_timeout, vcpu->arch.virtual_tsc_khz);
2115         hrtimer_start(&vmx->nested.preemption_timer,
2116                       ktime_add_ns(ktime_get(), preemption_timeout),
2117                       HRTIMER_MODE_ABS_PINNED);
2118 }
2119
2120 static u64 nested_vmx_calc_efer(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
2121 {
2122         if (vmx->nested.nested_run_pending &&
2123             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER))
2124                 return vmcs12->guest_ia32_efer;
2125         else if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE)
2126                 return vmx->vcpu.arch.efer | (EFER_LMA | EFER_LME);
2127         else
2128                 return vmx->vcpu.arch.efer & ~(EFER_LMA | EFER_LME);
2129 }
2130
2131 static void prepare_vmcs02_constant_state(struct vcpu_vmx *vmx)
2132 {
2133         struct kvm *kvm = vmx->vcpu.kvm;
2134
2135         /*
2136          * If vmcs02 hasn't been initialized, set the constant vmcs02 state
2137          * according to L0's settings (vmcs12 is irrelevant here).  Host
2138          * fields that come from L0 and are not constant, e.g. HOST_CR3,
2139          * will be set as needed prior to VMLAUNCH/VMRESUME.
2140          */
2141         if (vmx->nested.vmcs02_initialized)
2142                 return;
2143         vmx->nested.vmcs02_initialized = true;
2144
2145         /*
2146          * We don't care what the EPTP value is we just need to guarantee
2147          * it's valid so we don't get a false positive when doing early
2148          * consistency checks.
2149          */
2150         if (enable_ept && nested_early_check)
2151                 vmcs_write64(EPT_POINTER,
2152                              construct_eptp(&vmx->vcpu, 0, PT64_ROOT_4LEVEL));
2153
2154         /* All VMFUNCs are currently emulated through L0 vmexits.  */
2155         if (cpu_has_vmx_vmfunc())
2156                 vmcs_write64(VM_FUNCTION_CONTROL, 0);
2157
2158         if (cpu_has_vmx_posted_intr())
2159                 vmcs_write16(POSTED_INTR_NV, POSTED_INTR_NESTED_VECTOR);
2160
2161         if (cpu_has_vmx_msr_bitmap())
2162                 vmcs_write64(MSR_BITMAP, __pa(vmx->nested.vmcs02.msr_bitmap));
2163
2164         /*
2165          * PML is emulated for L2, but never enabled in hardware as the MMU
2166          * handles A/D emulation.  Disabling PML for L2 also avoids having to
2167          * deal with filtering out L2 GPAs from the buffer.
2168          */
2169         if (enable_pml) {
2170                 vmcs_write64(PML_ADDRESS, 0);
2171                 vmcs_write16(GUEST_PML_INDEX, -1);
2172         }
2173
2174         if (cpu_has_vmx_encls_vmexit())
2175                 vmcs_write64(ENCLS_EXITING_BITMAP, INVALID_GPA);
2176
2177         if (kvm_notify_vmexit_enabled(kvm))
2178                 vmcs_write32(NOTIFY_WINDOW, kvm->arch.notify_window);
2179
2180         /*
2181          * Set the MSR load/store lists to match L0's settings.  Only the
2182          * addresses are constant (for vmcs02), the counts can change based
2183          * on L2's behavior, e.g. switching to/from long mode.
2184          */
2185         vmcs_write64(VM_EXIT_MSR_STORE_ADDR, __pa(vmx->msr_autostore.guest.val));
2186         vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host.val));
2187         vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest.val));
2188
2189         vmx_set_constant_host_state(vmx);
2190 }
2191
2192 static void prepare_vmcs02_early_rare(struct vcpu_vmx *vmx,
2193                                       struct vmcs12 *vmcs12)
2194 {
2195         prepare_vmcs02_constant_state(vmx);
2196
2197         vmcs_write64(VMCS_LINK_POINTER, INVALID_GPA);
2198
2199         if (enable_vpid) {
2200                 if (nested_cpu_has_vpid(vmcs12) && vmx->nested.vpid02)
2201                         vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->nested.vpid02);
2202                 else
2203                         vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
2204         }
2205 }
2206
2207 static void prepare_vmcs02_early(struct vcpu_vmx *vmx, struct loaded_vmcs *vmcs01,
2208                                  struct vmcs12 *vmcs12)
2209 {
2210         u32 exec_control;
2211         u64 guest_efer = nested_vmx_calc_efer(vmx, vmcs12);
2212
2213         if (vmx->nested.dirty_vmcs12 || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
2214                 prepare_vmcs02_early_rare(vmx, vmcs12);
2215
2216         /*
2217          * PIN CONTROLS
2218          */
2219         exec_control = __pin_controls_get(vmcs01);
2220         exec_control |= (vmcs12->pin_based_vm_exec_control &
2221                          ~PIN_BASED_VMX_PREEMPTION_TIMER);
2222
2223         /* Posted interrupts setting is only taken from vmcs12.  */
2224         vmx->nested.pi_pending = false;
2225         if (nested_cpu_has_posted_intr(vmcs12))
2226                 vmx->nested.posted_intr_nv = vmcs12->posted_intr_nv;
2227         else
2228                 exec_control &= ~PIN_BASED_POSTED_INTR;
2229         pin_controls_set(vmx, exec_control);
2230
2231         /*
2232          * EXEC CONTROLS
2233          */
2234         exec_control = __exec_controls_get(vmcs01); /* L0's desires */
2235         exec_control &= ~CPU_BASED_INTR_WINDOW_EXITING;
2236         exec_control &= ~CPU_BASED_NMI_WINDOW_EXITING;
2237         exec_control &= ~CPU_BASED_TPR_SHADOW;
2238         exec_control |= vmcs12->cpu_based_vm_exec_control;
2239
2240         vmx->nested.l1_tpr_threshold = -1;
2241         if (exec_control & CPU_BASED_TPR_SHADOW)
2242                 vmcs_write32(TPR_THRESHOLD, vmcs12->tpr_threshold);
2243 #ifdef CONFIG_X86_64
2244         else
2245                 exec_control |= CPU_BASED_CR8_LOAD_EXITING |
2246                                 CPU_BASED_CR8_STORE_EXITING;
2247 #endif
2248
2249         /*
2250          * A vmexit (to either L1 hypervisor or L0 userspace) is always needed
2251          * for I/O port accesses.
2252          */
2253         exec_control |= CPU_BASED_UNCOND_IO_EXITING;
2254         exec_control &= ~CPU_BASED_USE_IO_BITMAPS;
2255
2256         /*
2257          * This bit will be computed in nested_get_vmcs12_pages, because
2258          * we do not have access to L1's MSR bitmap yet.  For now, keep
2259          * the same bit as before, hoping to avoid multiple VMWRITEs that
2260          * only set/clear this bit.
2261          */
2262         exec_control &= ~CPU_BASED_USE_MSR_BITMAPS;
2263         exec_control |= exec_controls_get(vmx) & CPU_BASED_USE_MSR_BITMAPS;
2264
2265         exec_controls_set(vmx, exec_control);
2266
2267         /*
2268          * SECONDARY EXEC CONTROLS
2269          */
2270         if (cpu_has_secondary_exec_ctrls()) {
2271                 exec_control = __secondary_exec_controls_get(vmcs01);
2272
2273                 /* Take the following fields only from vmcs12 */
2274                 exec_control &= ~(SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
2275                                   SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
2276                                   SECONDARY_EXEC_ENABLE_INVPCID |
2277                                   SECONDARY_EXEC_ENABLE_RDTSCP |
2278                                   SECONDARY_EXEC_XSAVES |
2279                                   SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE |
2280                                   SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
2281                                   SECONDARY_EXEC_APIC_REGISTER_VIRT |
2282                                   SECONDARY_EXEC_ENABLE_VMFUNC |
2283                                   SECONDARY_EXEC_DESC);
2284
2285                 if (nested_cpu_has(vmcs12,
2286                                    CPU_BASED_ACTIVATE_SECONDARY_CONTROLS))
2287                         exec_control |= vmcs12->secondary_vm_exec_control;
2288
2289                 /* PML is emulated and never enabled in hardware for L2. */
2290                 exec_control &= ~SECONDARY_EXEC_ENABLE_PML;
2291
2292                 /* VMCS shadowing for L2 is emulated for now */
2293                 exec_control &= ~SECONDARY_EXEC_SHADOW_VMCS;
2294
2295                 /*
2296                  * Preset *DT exiting when emulating UMIP, so that vmx_set_cr4()
2297                  * will not have to rewrite the controls just for this bit.
2298                  */
2299                 if (!boot_cpu_has(X86_FEATURE_UMIP) && vmx_umip_emulated() &&
2300                     (vmcs12->guest_cr4 & X86_CR4_UMIP))
2301                         exec_control |= SECONDARY_EXEC_DESC;
2302
2303                 if (exec_control & SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY)
2304                         vmcs_write16(GUEST_INTR_STATUS,
2305                                 vmcs12->guest_intr_status);
2306
2307                 if (!nested_cpu_has2(vmcs12, SECONDARY_EXEC_UNRESTRICTED_GUEST))
2308                     exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
2309
2310                 if (exec_control & SECONDARY_EXEC_ENCLS_EXITING)
2311                         vmx_write_encls_bitmap(&vmx->vcpu, vmcs12);
2312
2313                 secondary_exec_controls_set(vmx, exec_control);
2314         }
2315
2316         /*
2317          * ENTRY CONTROLS
2318          *
2319          * vmcs12's VM_{ENTRY,EXIT}_LOAD_IA32_EFER and VM_ENTRY_IA32E_MODE
2320          * are emulated by vmx_set_efer() in prepare_vmcs02(), but speculate
2321          * on the related bits (if supported by the CPU) in the hope that
2322          * we can avoid VMWrites during vmx_set_efer().
2323          *
2324          * Similarly, take vmcs01's PERF_GLOBAL_CTRL in the hope that if KVM is
2325          * loading PERF_GLOBAL_CTRL via the VMCS for L1, then KVM will want to
2326          * do the same for L2.
2327          */
2328         exec_control = __vm_entry_controls_get(vmcs01);
2329         exec_control |= (vmcs12->vm_entry_controls &
2330                          ~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL);
2331         exec_control &= ~(VM_ENTRY_IA32E_MODE | VM_ENTRY_LOAD_IA32_EFER);
2332         if (cpu_has_load_ia32_efer()) {
2333                 if (guest_efer & EFER_LMA)
2334                         exec_control |= VM_ENTRY_IA32E_MODE;
2335                 if (guest_efer != host_efer)
2336                         exec_control |= VM_ENTRY_LOAD_IA32_EFER;
2337         }
2338         vm_entry_controls_set(vmx, exec_control);
2339
2340         /*
2341          * EXIT CONTROLS
2342          *
2343          * L2->L1 exit controls are emulated - the hardware exit is to L0 so
2344          * we should use its exit controls. Note that VM_EXIT_LOAD_IA32_EFER
2345          * bits may be modified by vmx_set_efer() in prepare_vmcs02().
2346          */
2347         exec_control = __vm_exit_controls_get(vmcs01);
2348         if (cpu_has_load_ia32_efer() && guest_efer != host_efer)
2349                 exec_control |= VM_EXIT_LOAD_IA32_EFER;
2350         else
2351                 exec_control &= ~VM_EXIT_LOAD_IA32_EFER;
2352         vm_exit_controls_set(vmx, exec_control);
2353
2354         /*
2355          * Interrupt/Exception Fields
2356          */
2357         if (vmx->nested.nested_run_pending) {
2358                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
2359                              vmcs12->vm_entry_intr_info_field);
2360                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
2361                              vmcs12->vm_entry_exception_error_code);
2362                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
2363                              vmcs12->vm_entry_instruction_len);
2364                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
2365                              vmcs12->guest_interruptibility_info);
2366                 vmx->loaded_vmcs->nmi_known_unmasked =
2367                         !(vmcs12->guest_interruptibility_info & GUEST_INTR_STATE_NMI);
2368         } else {
2369                 vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
2370         }
2371 }
2372
2373 static void prepare_vmcs02_rare(struct vcpu_vmx *vmx, struct vmcs12 *vmcs12)
2374 {
2375         struct hv_enlightened_vmcs *hv_evmcs = vmx->nested.hv_evmcs;
2376
2377         if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
2378                            HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP2)) {
2379                 vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector);
2380                 vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector);
2381                 vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector);
2382                 vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector);
2383                 vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector);
2384                 vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector);
2385                 vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector);
2386                 vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector);
2387                 vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit);
2388                 vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit);
2389                 vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit);
2390                 vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit);
2391                 vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit);
2392                 vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit);
2393                 vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit);
2394                 vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit);
2395                 vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit);
2396                 vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit);
2397                 vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes);
2398                 vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes);
2399                 vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes);
2400                 vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes);
2401                 vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes);
2402                 vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes);
2403                 vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes);
2404                 vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes);
2405                 vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base);
2406                 vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base);
2407                 vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base);
2408                 vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base);
2409                 vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base);
2410                 vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base);
2411                 vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base);
2412                 vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base);
2413                 vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
2414                 vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
2415
2416                 vmx->segment_cache.bitmask = 0;
2417         }
2418
2419         if (!hv_evmcs || !(hv_evmcs->hv_clean_fields &
2420                            HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1)) {
2421                 vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
2422                 vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
2423                             vmcs12->guest_pending_dbg_exceptions);
2424                 vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp);
2425                 vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip);
2426
2427                 /*
2428                  * L1 may access the L2's PDPTR, so save them to construct
2429                  * vmcs12
2430                  */
2431                 if (enable_ept) {
2432                         vmcs_write64(GUEST_PDPTR0, vmcs12->guest_pdptr0);
2433                         vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
2434                         vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
2435                         vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
2436                 }
2437
2438                 if (kvm_mpx_supported() && vmx->nested.nested_run_pending &&
2439                     (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS))
2440                         vmcs_write64(GUEST_BNDCFGS, vmcs12->guest_bndcfgs);
2441         }
2442
2443         if (nested_cpu_has_xsaves(vmcs12))
2444                 vmcs_write64(XSS_EXIT_BITMAP, vmcs12->xss_exit_bitmap);
2445
2446         /*
2447          * Whether page-faults are trapped is determined by a combination of
2448          * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF.  If L0
2449          * doesn't care about page faults then we should set all of these to
2450          * L1's desires. However, if L0 does care about (some) page faults, it
2451          * is not easy (if at all possible?) to merge L0 and L1's desires, we
2452          * simply ask to exit on each and every L2 page fault. This is done by
2453          * setting MASK=MATCH=0 and (see below) EB.PF=1.
2454          * Note that below we don't need special code to set EB.PF beyond the
2455          * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept,
2456          * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when
2457          * !enable_ept, EB.PF is 1, so the "or" will always be 1.
2458          */
2459         if (vmx_need_pf_intercept(&vmx->vcpu)) {
2460                 /*
2461                  * TODO: if both L0 and L1 need the same MASK and MATCH,
2462                  * go ahead and use it?
2463                  */
2464                 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
2465                 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
2466         } else {
2467                 vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, vmcs12->page_fault_error_code_mask);
2468                 vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, vmcs12->page_fault_error_code_match);
2469         }
2470
2471         if (cpu_has_vmx_apicv()) {
2472                 vmcs_write64(EOI_EXIT_BITMAP0, vmcs12->eoi_exit_bitmap0);
2473                 vmcs_write64(EOI_EXIT_BITMAP1, vmcs12->eoi_exit_bitmap1);
2474                 vmcs_write64(EOI_EXIT_BITMAP2, vmcs12->eoi_exit_bitmap2);
2475                 vmcs_write64(EOI_EXIT_BITMAP3, vmcs12->eoi_exit_bitmap3);
2476         }
2477
2478         /*
2479          * Make sure the msr_autostore list is up to date before we set the
2480          * count in the vmcs02.
2481          */
2482         prepare_vmx_msr_autostore_list(&vmx->vcpu, MSR_IA32_TSC);
2483
2484         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, vmx->msr_autostore.guest.nr);
2485         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
2486         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
2487
2488         set_cr4_guest_host_mask(vmx);
2489 }
2490
2491 /*
2492  * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested
2493  * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it
2494  * with L0's requirements for its guest (a.k.a. vmcs01), so we can run the L2
2495  * guest in a way that will both be appropriate to L1's requests, and our
2496  * needs. In addition to modifying the active vmcs (which is vmcs02), this
2497  * function also has additional necessary side-effects, like setting various
2498  * vcpu->arch fields.
2499  * Returns 0 on success, 1 on failure. Invalid state exit qualification code
2500  * is assigned to entry_failure_code on failure.
2501  */
2502 static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
2503                           bool from_vmentry,
2504                           enum vm_entry_failure_code *entry_failure_code)
2505 {
2506         struct vcpu_vmx *vmx = to_vmx(vcpu);
2507         bool load_guest_pdptrs_vmcs12 = false;
2508
2509         if (vmx->nested.dirty_vmcs12 || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
2510                 prepare_vmcs02_rare(vmx, vmcs12);
2511                 vmx->nested.dirty_vmcs12 = false;
2512
2513                 load_guest_pdptrs_vmcs12 = !evmptr_is_valid(vmx->nested.hv_evmcs_vmptr) ||
2514                         !(vmx->nested.hv_evmcs->hv_clean_fields &
2515                           HV_VMX_ENLIGHTENED_CLEAN_FIELD_GUEST_GRP1);
2516         }
2517
2518         if (vmx->nested.nested_run_pending &&
2519             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS)) {
2520                 kvm_set_dr(vcpu, 7, vmcs12->guest_dr7);
2521                 vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
2522         } else {
2523                 kvm_set_dr(vcpu, 7, vcpu->arch.dr7);
2524                 vmcs_write64(GUEST_IA32_DEBUGCTL, vmx->nested.pre_vmenter_debugctl);
2525         }
2526         if (kvm_mpx_supported() && (!vmx->nested.nested_run_pending ||
2527             !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)))
2528                 vmcs_write64(GUEST_BNDCFGS, vmx->nested.pre_vmenter_bndcfgs);
2529         vmx_set_rflags(vcpu, vmcs12->guest_rflags);
2530
2531         /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the
2532          * bitwise-or of what L1 wants to trap for L2, and what we want to
2533          * trap. Note that CR0.TS also needs updating - we do this later.
2534          */
2535         vmx_update_exception_bitmap(vcpu);
2536         vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask;
2537         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
2538
2539         if (vmx->nested.nested_run_pending &&
2540             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)) {
2541                 vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat);
2542                 vcpu->arch.pat = vmcs12->guest_ia32_pat;
2543         } else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2544                 vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
2545         }
2546
2547         vcpu->arch.tsc_offset = kvm_calc_nested_tsc_offset(
2548                         vcpu->arch.l1_tsc_offset,
2549                         vmx_get_l2_tsc_offset(vcpu),
2550                         vmx_get_l2_tsc_multiplier(vcpu));
2551
2552         vcpu->arch.tsc_scaling_ratio = kvm_calc_nested_tsc_multiplier(
2553                         vcpu->arch.l1_tsc_scaling_ratio,
2554                         vmx_get_l2_tsc_multiplier(vcpu));
2555
2556         vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);
2557         if (kvm_caps.has_tsc_control)
2558                 vmcs_write64(TSC_MULTIPLIER, vcpu->arch.tsc_scaling_ratio);
2559
2560         nested_vmx_transition_tlb_flush(vcpu, vmcs12, true);
2561
2562         if (nested_cpu_has_ept(vmcs12))
2563                 nested_ept_init_mmu_context(vcpu);
2564
2565         /*
2566          * This sets GUEST_CR0 to vmcs12->guest_cr0, possibly modifying those
2567          * bits which we consider mandatory enabled.
2568          * The CR0_READ_SHADOW is what L2 should have expected to read given
2569          * the specifications by L1; It's not enough to take
2570          * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we
2571          * have more bits than L1 expected.
2572          */
2573         vmx_set_cr0(vcpu, vmcs12->guest_cr0);
2574         vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
2575
2576         vmx_set_cr4(vcpu, vmcs12->guest_cr4);
2577         vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12));
2578
2579         vcpu->arch.efer = nested_vmx_calc_efer(vmx, vmcs12);
2580         /* Note: may modify VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */
2581         vmx_set_efer(vcpu, vcpu->arch.efer);
2582
2583         /*
2584          * Guest state is invalid and unrestricted guest is disabled,
2585          * which means L1 attempted VMEntry to L2 with invalid state.
2586          * Fail the VMEntry.
2587          *
2588          * However when force loading the guest state (SMM exit or
2589          * loading nested state after migration, it is possible to
2590          * have invalid guest state now, which will be later fixed by
2591          * restoring L2 register state
2592          */
2593         if (CC(from_vmentry && !vmx_guest_state_valid(vcpu))) {
2594                 *entry_failure_code = ENTRY_FAIL_DEFAULT;
2595                 return -EINVAL;
2596         }
2597
2598         /* Shadow page tables on either EPT or shadow page tables. */
2599         if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12),
2600                                 from_vmentry, entry_failure_code))
2601                 return -EINVAL;
2602
2603         /*
2604          * Immediately write vmcs02.GUEST_CR3.  It will be propagated to vmcs12
2605          * on nested VM-Exit, which can occur without actually running L2 and
2606          * thus without hitting vmx_load_mmu_pgd(), e.g. if L1 is entering L2 with
2607          * vmcs12.GUEST_ACTIVITYSTATE=HLT, in which case KVM will intercept the
2608          * transition to HLT instead of running L2.
2609          */
2610         if (enable_ept)
2611                 vmcs_writel(GUEST_CR3, vmcs12->guest_cr3);
2612
2613         /* Late preparation of GUEST_PDPTRs now that EFER and CRs are set. */
2614         if (load_guest_pdptrs_vmcs12 && nested_cpu_has_ept(vmcs12) &&
2615             is_pae_paging(vcpu)) {
2616                 vmcs_write64(GUEST_PDPTR0, vmcs12->guest_pdptr0);
2617                 vmcs_write64(GUEST_PDPTR1, vmcs12->guest_pdptr1);
2618                 vmcs_write64(GUEST_PDPTR2, vmcs12->guest_pdptr2);
2619                 vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
2620         }
2621
2622         if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
2623             intel_pmu_has_perf_global_ctrl(vcpu_to_pmu(vcpu)) &&
2624             WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
2625                                      vmcs12->guest_ia32_perf_global_ctrl))) {
2626                 *entry_failure_code = ENTRY_FAIL_DEFAULT;
2627                 return -EINVAL;
2628         }
2629
2630         kvm_rsp_write(vcpu, vmcs12->guest_rsp);
2631         kvm_rip_write(vcpu, vmcs12->guest_rip);
2632
2633         /*
2634          * It was observed that genuine Hyper-V running in L1 doesn't reset
2635          * 'hv_clean_fields' by itself, it only sets the corresponding dirty
2636          * bits when it changes a field in eVMCS. Mark all fields as clean
2637          * here.
2638          */
2639         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
2640                 vmx->nested.hv_evmcs->hv_clean_fields |=
2641                         HV_VMX_ENLIGHTENED_CLEAN_FIELD_ALL;
2642
2643         return 0;
2644 }
2645
2646 static int nested_vmx_check_nmi_controls(struct vmcs12 *vmcs12)
2647 {
2648         if (CC(!nested_cpu_has_nmi_exiting(vmcs12) &&
2649                nested_cpu_has_virtual_nmis(vmcs12)))
2650                 return -EINVAL;
2651
2652         if (CC(!nested_cpu_has_virtual_nmis(vmcs12) &&
2653                nested_cpu_has(vmcs12, CPU_BASED_NMI_WINDOW_EXITING)))
2654                 return -EINVAL;
2655
2656         return 0;
2657 }
2658
2659 static bool nested_vmx_check_eptp(struct kvm_vcpu *vcpu, u64 new_eptp)
2660 {
2661         struct vcpu_vmx *vmx = to_vmx(vcpu);
2662
2663         /* Check for memory type validity */
2664         switch (new_eptp & VMX_EPTP_MT_MASK) {
2665         case VMX_EPTP_MT_UC:
2666                 if (CC(!(vmx->nested.msrs.ept_caps & VMX_EPTP_UC_BIT)))
2667                         return false;
2668                 break;
2669         case VMX_EPTP_MT_WB:
2670                 if (CC(!(vmx->nested.msrs.ept_caps & VMX_EPTP_WB_BIT)))
2671                         return false;
2672                 break;
2673         default:
2674                 return false;
2675         }
2676
2677         /* Page-walk levels validity. */
2678         switch (new_eptp & VMX_EPTP_PWL_MASK) {
2679         case VMX_EPTP_PWL_5:
2680                 if (CC(!(vmx->nested.msrs.ept_caps & VMX_EPT_PAGE_WALK_5_BIT)))
2681                         return false;
2682                 break;
2683         case VMX_EPTP_PWL_4:
2684                 if (CC(!(vmx->nested.msrs.ept_caps & VMX_EPT_PAGE_WALK_4_BIT)))
2685                         return false;
2686                 break;
2687         default:
2688                 return false;
2689         }
2690
2691         /* Reserved bits should not be set */
2692         if (CC(kvm_vcpu_is_illegal_gpa(vcpu, new_eptp) || ((new_eptp >> 7) & 0x1f)))
2693                 return false;
2694
2695         /* AD, if set, should be supported */
2696         if (new_eptp & VMX_EPTP_AD_ENABLE_BIT) {
2697                 if (CC(!(vmx->nested.msrs.ept_caps & VMX_EPT_AD_BIT)))
2698                         return false;
2699         }
2700
2701         return true;
2702 }
2703
2704 /*
2705  * Checks related to VM-Execution Control Fields
2706  */
2707 static int nested_check_vm_execution_controls(struct kvm_vcpu *vcpu,
2708                                               struct vmcs12 *vmcs12)
2709 {
2710         struct vcpu_vmx *vmx = to_vmx(vcpu);
2711
2712         if (CC(!vmx_control_verify(vmcs12->pin_based_vm_exec_control,
2713                                    vmx->nested.msrs.pinbased_ctls_low,
2714                                    vmx->nested.msrs.pinbased_ctls_high)) ||
2715             CC(!vmx_control_verify(vmcs12->cpu_based_vm_exec_control,
2716                                    vmx->nested.msrs.procbased_ctls_low,
2717                                    vmx->nested.msrs.procbased_ctls_high)))
2718                 return -EINVAL;
2719
2720         if (nested_cpu_has(vmcs12, CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
2721             CC(!vmx_control_verify(vmcs12->secondary_vm_exec_control,
2722                                    vmx->nested.msrs.secondary_ctls_low,
2723                                    vmx->nested.msrs.secondary_ctls_high)))
2724                 return -EINVAL;
2725
2726         if (CC(vmcs12->cr3_target_count > nested_cpu_vmx_misc_cr3_count(vcpu)) ||
2727             nested_vmx_check_io_bitmap_controls(vcpu, vmcs12) ||
2728             nested_vmx_check_msr_bitmap_controls(vcpu, vmcs12) ||
2729             nested_vmx_check_tpr_shadow_controls(vcpu, vmcs12) ||
2730             nested_vmx_check_apic_access_controls(vcpu, vmcs12) ||
2731             nested_vmx_check_apicv_controls(vcpu, vmcs12) ||
2732             nested_vmx_check_nmi_controls(vmcs12) ||
2733             nested_vmx_check_pml_controls(vcpu, vmcs12) ||
2734             nested_vmx_check_unrestricted_guest_controls(vcpu, vmcs12) ||
2735             nested_vmx_check_mode_based_ept_exec_controls(vcpu, vmcs12) ||
2736             nested_vmx_check_shadow_vmcs_controls(vcpu, vmcs12) ||
2737             CC(nested_cpu_has_vpid(vmcs12) && !vmcs12->virtual_processor_id))
2738                 return -EINVAL;
2739
2740         if (!nested_cpu_has_preemption_timer(vmcs12) &&
2741             nested_cpu_has_save_preemption_timer(vmcs12))
2742                 return -EINVAL;
2743
2744         if (nested_cpu_has_ept(vmcs12) &&
2745             CC(!nested_vmx_check_eptp(vcpu, vmcs12->ept_pointer)))
2746                 return -EINVAL;
2747
2748         if (nested_cpu_has_vmfunc(vmcs12)) {
2749                 if (CC(vmcs12->vm_function_control &
2750                        ~vmx->nested.msrs.vmfunc_controls))
2751                         return -EINVAL;
2752
2753                 if (nested_cpu_has_eptp_switching(vmcs12)) {
2754                         if (CC(!nested_cpu_has_ept(vmcs12)) ||
2755                             CC(!page_address_valid(vcpu, vmcs12->eptp_list_address)))
2756                                 return -EINVAL;
2757                 }
2758         }
2759
2760         return 0;
2761 }
2762
2763 /*
2764  * Checks related to VM-Exit Control Fields
2765  */
2766 static int nested_check_vm_exit_controls(struct kvm_vcpu *vcpu,
2767                                          struct vmcs12 *vmcs12)
2768 {
2769         struct vcpu_vmx *vmx = to_vmx(vcpu);
2770
2771         if (CC(!vmx_control_verify(vmcs12->vm_exit_controls,
2772                                     vmx->nested.msrs.exit_ctls_low,
2773                                     vmx->nested.msrs.exit_ctls_high)) ||
2774             CC(nested_vmx_check_exit_msr_switch_controls(vcpu, vmcs12)))
2775                 return -EINVAL;
2776
2777         return 0;
2778 }
2779
2780 /*
2781  * Checks related to VM-Entry Control Fields
2782  */
2783 static int nested_check_vm_entry_controls(struct kvm_vcpu *vcpu,
2784                                           struct vmcs12 *vmcs12)
2785 {
2786         struct vcpu_vmx *vmx = to_vmx(vcpu);
2787
2788         if (CC(!vmx_control_verify(vmcs12->vm_entry_controls,
2789                                     vmx->nested.msrs.entry_ctls_low,
2790                                     vmx->nested.msrs.entry_ctls_high)))
2791                 return -EINVAL;
2792
2793         /*
2794          * From the Intel SDM, volume 3:
2795          * Fields relevant to VM-entry event injection must be set properly.
2796          * These fields are the VM-entry interruption-information field, the
2797          * VM-entry exception error code, and the VM-entry instruction length.
2798          */
2799         if (vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK) {
2800                 u32 intr_info = vmcs12->vm_entry_intr_info_field;
2801                 u8 vector = intr_info & INTR_INFO_VECTOR_MASK;
2802                 u32 intr_type = intr_info & INTR_INFO_INTR_TYPE_MASK;
2803                 bool has_error_code = intr_info & INTR_INFO_DELIVER_CODE_MASK;
2804                 bool should_have_error_code;
2805                 bool urg = nested_cpu_has2(vmcs12,
2806                                            SECONDARY_EXEC_UNRESTRICTED_GUEST);
2807                 bool prot_mode = !urg || vmcs12->guest_cr0 & X86_CR0_PE;
2808
2809                 /* VM-entry interruption-info field: interruption type */
2810                 if (CC(intr_type == INTR_TYPE_RESERVED) ||
2811                     CC(intr_type == INTR_TYPE_OTHER_EVENT &&
2812                        !nested_cpu_supports_monitor_trap_flag(vcpu)))
2813                         return -EINVAL;
2814
2815                 /* VM-entry interruption-info field: vector */
2816                 if (CC(intr_type == INTR_TYPE_NMI_INTR && vector != NMI_VECTOR) ||
2817                     CC(intr_type == INTR_TYPE_HARD_EXCEPTION && vector > 31) ||
2818                     CC(intr_type == INTR_TYPE_OTHER_EVENT && vector != 0))
2819                         return -EINVAL;
2820
2821                 /* VM-entry interruption-info field: deliver error code */
2822                 should_have_error_code =
2823                         intr_type == INTR_TYPE_HARD_EXCEPTION && prot_mode &&
2824                         x86_exception_has_error_code(vector);
2825                 if (CC(has_error_code != should_have_error_code))
2826                         return -EINVAL;
2827
2828                 /* VM-entry exception error code */
2829                 if (CC(has_error_code &&
2830                        vmcs12->vm_entry_exception_error_code & GENMASK(31, 16)))
2831                         return -EINVAL;
2832
2833                 /* VM-entry interruption-info field: reserved bits */
2834                 if (CC(intr_info & INTR_INFO_RESVD_BITS_MASK))
2835                         return -EINVAL;
2836
2837                 /* VM-entry instruction length */
2838                 switch (intr_type) {
2839                 case INTR_TYPE_SOFT_EXCEPTION:
2840                 case INTR_TYPE_SOFT_INTR:
2841                 case INTR_TYPE_PRIV_SW_EXCEPTION:
2842                         if (CC(vmcs12->vm_entry_instruction_len > 15) ||
2843                             CC(vmcs12->vm_entry_instruction_len == 0 &&
2844                             CC(!nested_cpu_has_zero_length_injection(vcpu))))
2845                                 return -EINVAL;
2846                 }
2847         }
2848
2849         if (nested_vmx_check_entry_msr_switch_controls(vcpu, vmcs12))
2850                 return -EINVAL;
2851
2852         return 0;
2853 }
2854
2855 static int nested_vmx_check_controls(struct kvm_vcpu *vcpu,
2856                                      struct vmcs12 *vmcs12)
2857 {
2858         if (nested_check_vm_execution_controls(vcpu, vmcs12) ||
2859             nested_check_vm_exit_controls(vcpu, vmcs12) ||
2860             nested_check_vm_entry_controls(vcpu, vmcs12))
2861                 return -EINVAL;
2862
2863         if (guest_cpuid_has_evmcs(vcpu))
2864                 return nested_evmcs_check_controls(vmcs12);
2865
2866         return 0;
2867 }
2868
2869 static int nested_vmx_check_address_space_size(struct kvm_vcpu *vcpu,
2870                                        struct vmcs12 *vmcs12)
2871 {
2872 #ifdef CONFIG_X86_64
2873         if (CC(!!(vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) !=
2874                 !!(vcpu->arch.efer & EFER_LMA)))
2875                 return -EINVAL;
2876 #endif
2877         return 0;
2878 }
2879
2880 static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,
2881                                        struct vmcs12 *vmcs12)
2882 {
2883         bool ia32e;
2884
2885         if (CC(!nested_host_cr0_valid(vcpu, vmcs12->host_cr0)) ||
2886             CC(!nested_host_cr4_valid(vcpu, vmcs12->host_cr4)) ||
2887             CC(kvm_vcpu_is_illegal_gpa(vcpu, vmcs12->host_cr3)))
2888                 return -EINVAL;
2889
2890         if (CC(is_noncanonical_address(vmcs12->host_ia32_sysenter_esp, vcpu)) ||
2891             CC(is_noncanonical_address(vmcs12->host_ia32_sysenter_eip, vcpu)))
2892                 return -EINVAL;
2893
2894         if ((vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) &&
2895             CC(!kvm_pat_valid(vmcs12->host_ia32_pat)))
2896                 return -EINVAL;
2897
2898         if ((vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) &&
2899             CC(!kvm_valid_perf_global_ctrl(vcpu_to_pmu(vcpu),
2900                                            vmcs12->host_ia32_perf_global_ctrl)))
2901                 return -EINVAL;
2902
2903 #ifdef CONFIG_X86_64
2904         ia32e = !!(vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE);
2905 #else
2906         ia32e = false;
2907 #endif
2908
2909         if (ia32e) {
2910                 if (CC(!(vmcs12->host_cr4 & X86_CR4_PAE)))
2911                         return -EINVAL;
2912         } else {
2913                 if (CC(vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) ||
2914                     CC(vmcs12->host_cr4 & X86_CR4_PCIDE) ||
2915                     CC((vmcs12->host_rip) >> 32))
2916                         return -EINVAL;
2917         }
2918
2919         if (CC(vmcs12->host_cs_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2920             CC(vmcs12->host_ss_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2921             CC(vmcs12->host_ds_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2922             CC(vmcs12->host_es_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2923             CC(vmcs12->host_fs_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2924             CC(vmcs12->host_gs_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2925             CC(vmcs12->host_tr_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
2926             CC(vmcs12->host_cs_selector == 0) ||
2927             CC(vmcs12->host_tr_selector == 0) ||
2928             CC(vmcs12->host_ss_selector == 0 && !ia32e))
2929                 return -EINVAL;
2930
2931         if (CC(is_noncanonical_address(vmcs12->host_fs_base, vcpu)) ||
2932             CC(is_noncanonical_address(vmcs12->host_gs_base, vcpu)) ||
2933             CC(is_noncanonical_address(vmcs12->host_gdtr_base, vcpu)) ||
2934             CC(is_noncanonical_address(vmcs12->host_idtr_base, vcpu)) ||
2935             CC(is_noncanonical_address(vmcs12->host_tr_base, vcpu)) ||
2936             CC(is_noncanonical_address(vmcs12->host_rip, vcpu)))
2937                 return -EINVAL;
2938
2939         /*
2940          * If the load IA32_EFER VM-exit control is 1, bits reserved in the
2941          * IA32_EFER MSR must be 0 in the field for that register. In addition,
2942          * the values of the LMA and LME bits in the field must each be that of
2943          * the host address-space size VM-exit control.
2944          */
2945         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER) {
2946                 if (CC(!kvm_valid_efer(vcpu, vmcs12->host_ia32_efer)) ||
2947                     CC(ia32e != !!(vmcs12->host_ia32_efer & EFER_LMA)) ||
2948                     CC(ia32e != !!(vmcs12->host_ia32_efer & EFER_LME)))
2949                         return -EINVAL;
2950         }
2951
2952         return 0;
2953 }
2954
2955 static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
2956                                           struct vmcs12 *vmcs12)
2957 {
2958         struct vcpu_vmx *vmx = to_vmx(vcpu);
2959         struct gfn_to_hva_cache *ghc = &vmx->nested.shadow_vmcs12_cache;
2960         struct vmcs_hdr hdr;
2961
2962         if (vmcs12->vmcs_link_pointer == INVALID_GPA)
2963                 return 0;
2964
2965         if (CC(!page_address_valid(vcpu, vmcs12->vmcs_link_pointer)))
2966                 return -EINVAL;
2967
2968         if (ghc->gpa != vmcs12->vmcs_link_pointer &&
2969             CC(kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc,
2970                                          vmcs12->vmcs_link_pointer, VMCS12_SIZE)))
2971                 return -EINVAL;
2972
2973         if (CC(kvm_read_guest_offset_cached(vcpu->kvm, ghc, &hdr,
2974                                             offsetof(struct vmcs12, hdr),
2975                                             sizeof(hdr))))
2976                 return -EINVAL;
2977
2978         if (CC(hdr.revision_id != VMCS12_REVISION) ||
2979             CC(hdr.shadow_vmcs != nested_cpu_has_shadow_vmcs(vmcs12)))
2980                 return -EINVAL;
2981
2982         return 0;
2983 }
2984
2985 /*
2986  * Checks related to Guest Non-register State
2987  */
2988 static int nested_check_guest_non_reg_state(struct vmcs12 *vmcs12)
2989 {
2990         if (CC(vmcs12->guest_activity_state != GUEST_ACTIVITY_ACTIVE &&
2991                vmcs12->guest_activity_state != GUEST_ACTIVITY_HLT &&
2992                vmcs12->guest_activity_state != GUEST_ACTIVITY_WAIT_SIPI))
2993                 return -EINVAL;
2994
2995         return 0;
2996 }
2997
2998 static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu,
2999                                         struct vmcs12 *vmcs12,
3000                                         enum vm_entry_failure_code *entry_failure_code)
3001 {
3002         bool ia32e = !!(vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE);
3003
3004         *entry_failure_code = ENTRY_FAIL_DEFAULT;
3005
3006         if (CC(!nested_guest_cr0_valid(vcpu, vmcs12->guest_cr0)) ||
3007             CC(!nested_guest_cr4_valid(vcpu, vmcs12->guest_cr4)))
3008                 return -EINVAL;
3009
3010         if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS) &&
3011             CC(!kvm_dr7_valid(vmcs12->guest_dr7)))
3012                 return -EINVAL;
3013
3014         if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) &&
3015             CC(!kvm_pat_valid(vmcs12->guest_ia32_pat)))
3016                 return -EINVAL;
3017
3018         if (nested_vmx_check_vmcs_link_ptr(vcpu, vmcs12)) {
3019                 *entry_failure_code = ENTRY_FAIL_VMCS_LINK_PTR;
3020                 return -EINVAL;
3021         }
3022
3023         if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
3024             CC(!kvm_valid_perf_global_ctrl(vcpu_to_pmu(vcpu),
3025                                            vmcs12->guest_ia32_perf_global_ctrl)))
3026                 return -EINVAL;
3027
3028         if (CC((vmcs12->guest_cr0 & (X86_CR0_PG | X86_CR0_PE)) == X86_CR0_PG))
3029                 return -EINVAL;
3030
3031         if (CC(ia32e && !(vmcs12->guest_cr4 & X86_CR4_PAE)) ||
3032             CC(ia32e && !(vmcs12->guest_cr0 & X86_CR0_PG)))
3033                 return -EINVAL;
3034
3035         /*
3036          * If the load IA32_EFER VM-entry control is 1, the following checks
3037          * are performed on the field for the IA32_EFER MSR:
3038          * - Bits reserved in the IA32_EFER MSR must be 0.
3039          * - Bit 10 (corresponding to IA32_EFER.LMA) must equal the value of
3040          *   the IA-32e mode guest VM-exit control. It must also be identical
3041          *   to bit 8 (LME) if bit 31 in the CR0 field (corresponding to
3042          *   CR0.PG) is 1.
3043          */
3044         if (to_vmx(vcpu)->nested.nested_run_pending &&
3045             (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)) {
3046                 if (CC(!kvm_valid_efer(vcpu, vmcs12->guest_ia32_efer)) ||
3047                     CC(ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA)) ||
3048                     CC(((vmcs12->guest_cr0 & X86_CR0_PG) &&
3049                      ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME))))
3050                         return -EINVAL;
3051         }
3052
3053         if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS) &&
3054             (CC(is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu)) ||
3055              CC((vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD))))
3056                 return -EINVAL;
3057
3058         if (nested_check_guest_non_reg_state(vmcs12))
3059                 return -EINVAL;
3060
3061         return 0;
3062 }
3063
3064 static int nested_vmx_check_vmentry_hw(struct kvm_vcpu *vcpu)
3065 {
3066         struct vcpu_vmx *vmx = to_vmx(vcpu);
3067         unsigned long cr3, cr4;
3068         bool vm_fail;
3069
3070         if (!nested_early_check)
3071                 return 0;
3072
3073         if (vmx->msr_autoload.host.nr)
3074                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
3075         if (vmx->msr_autoload.guest.nr)
3076                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
3077
3078         preempt_disable();
3079
3080         vmx_prepare_switch_to_guest(vcpu);
3081
3082         /*
3083          * Induce a consistency check VMExit by clearing bit 1 in GUEST_RFLAGS,
3084          * which is reserved to '1' by hardware.  GUEST_RFLAGS is guaranteed to
3085          * be written (by prepare_vmcs02()) before the "real" VMEnter, i.e.
3086          * there is no need to preserve other bits or save/restore the field.
3087          */
3088         vmcs_writel(GUEST_RFLAGS, 0);
3089
3090         cr3 = __get_current_cr3_fast();
3091         if (unlikely(cr3 != vmx->loaded_vmcs->host_state.cr3)) {
3092                 vmcs_writel(HOST_CR3, cr3);
3093                 vmx->loaded_vmcs->host_state.cr3 = cr3;
3094         }
3095
3096         cr4 = cr4_read_shadow();
3097         if (unlikely(cr4 != vmx->loaded_vmcs->host_state.cr4)) {
3098                 vmcs_writel(HOST_CR4, cr4);
3099                 vmx->loaded_vmcs->host_state.cr4 = cr4;
3100         }
3101
3102         vm_fail = __vmx_vcpu_run(vmx, (unsigned long *)&vcpu->arch.regs,
3103                                  __vmx_vcpu_run_flags(vmx));
3104
3105         if (vmx->msr_autoload.host.nr)
3106                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
3107         if (vmx->msr_autoload.guest.nr)
3108                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
3109
3110         if (vm_fail) {
3111                 u32 error = vmcs_read32(VM_INSTRUCTION_ERROR);
3112
3113                 preempt_enable();
3114
3115                 trace_kvm_nested_vmenter_failed(
3116                         "early hardware check VM-instruction error: ", error);
3117                 WARN_ON_ONCE(error != VMXERR_ENTRY_INVALID_CONTROL_FIELD);
3118                 return 1;
3119         }
3120
3121         /*
3122          * VMExit clears RFLAGS.IF and DR7, even on a consistency check.
3123          */
3124         if (hw_breakpoint_active())
3125                 set_debugreg(__this_cpu_read(cpu_dr7), 7);
3126         local_irq_enable();
3127         preempt_enable();
3128
3129         /*
3130          * A non-failing VMEntry means we somehow entered guest mode with
3131          * an illegal RIP, and that's just the tip of the iceberg.  There
3132          * is no telling what memory has been modified or what state has
3133          * been exposed to unknown code.  Hitting this all but guarantees
3134          * a (very critical) hardware issue.
3135          */
3136         WARN_ON(!(vmcs_read32(VM_EXIT_REASON) &
3137                 VMX_EXIT_REASONS_FAILED_VMENTRY));
3138
3139         return 0;
3140 }
3141
3142 static bool nested_get_evmcs_page(struct kvm_vcpu *vcpu)
3143 {
3144         struct vcpu_vmx *vmx = to_vmx(vcpu);
3145
3146         /*
3147          * hv_evmcs may end up being not mapped after migration (when
3148          * L2 was running), map it here to make sure vmcs12 changes are
3149          * properly reflected.
3150          */
3151         if (guest_cpuid_has_evmcs(vcpu) &&
3152             vmx->nested.hv_evmcs_vmptr == EVMPTR_MAP_PENDING) {
3153                 enum nested_evmptrld_status evmptrld_status =
3154                         nested_vmx_handle_enlightened_vmptrld(vcpu, false);
3155
3156                 if (evmptrld_status == EVMPTRLD_VMFAIL ||
3157                     evmptrld_status == EVMPTRLD_ERROR)
3158                         return false;
3159
3160                 /*
3161                  * Post migration VMCS12 always provides the most actual
3162                  * information, copy it to eVMCS upon entry.
3163                  */
3164                 vmx->nested.need_vmcs12_to_shadow_sync = true;
3165         }
3166
3167         return true;
3168 }
3169
3170 static bool nested_get_vmcs12_pages(struct kvm_vcpu *vcpu)
3171 {
3172         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3173         struct vcpu_vmx *vmx = to_vmx(vcpu);
3174         struct kvm_host_map *map;
3175
3176         if (!vcpu->arch.pdptrs_from_userspace &&
3177             !nested_cpu_has_ept(vmcs12) && is_pae_paging(vcpu)) {
3178                 /*
3179                  * Reload the guest's PDPTRs since after a migration
3180                  * the guest CR3 might be restored prior to setting the nested
3181                  * state which can lead to a load of wrong PDPTRs.
3182                  */
3183                 if (CC(!load_pdptrs(vcpu, vcpu->arch.cr3)))
3184                         return false;
3185         }
3186
3187
3188         if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
3189                 map = &vmx->nested.apic_access_page_map;
3190
3191                 if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->apic_access_addr), map)) {
3192                         vmcs_write64(APIC_ACCESS_ADDR, pfn_to_hpa(map->pfn));
3193                 } else {
3194                         pr_debug_ratelimited("%s: no backing for APIC-access address in vmcs12\n",
3195                                              __func__);
3196                         vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
3197                         vcpu->run->internal.suberror =
3198                                 KVM_INTERNAL_ERROR_EMULATION;
3199                         vcpu->run->internal.ndata = 0;
3200                         return false;
3201                 }
3202         }
3203
3204         if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
3205                 map = &vmx->nested.virtual_apic_map;
3206
3207                 if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->virtual_apic_page_addr), map)) {
3208                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, pfn_to_hpa(map->pfn));
3209                 } else if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING) &&
3210                            nested_cpu_has(vmcs12, CPU_BASED_CR8_STORE_EXITING) &&
3211                            !nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES)) {
3212                         /*
3213                          * The processor will never use the TPR shadow, simply
3214                          * clear the bit from the execution control.  Such a
3215                          * configuration is useless, but it happens in tests.
3216                          * For any other configuration, failing the vm entry is
3217                          * _not_ what the processor does but it's basically the
3218                          * only possibility we have.
3219                          */
3220                         exec_controls_clearbit(vmx, CPU_BASED_TPR_SHADOW);
3221                 } else {
3222                         /*
3223                          * Write an illegal value to VIRTUAL_APIC_PAGE_ADDR to
3224                          * force VM-Entry to fail.
3225                          */
3226                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, INVALID_GPA);
3227                 }
3228         }
3229
3230         if (nested_cpu_has_posted_intr(vmcs12)) {
3231                 map = &vmx->nested.pi_desc_map;
3232
3233                 if (!kvm_vcpu_map(vcpu, gpa_to_gfn(vmcs12->posted_intr_desc_addr), map)) {
3234                         vmx->nested.pi_desc =
3235                                 (struct pi_desc *)(((void *)map->hva) +
3236                                 offset_in_page(vmcs12->posted_intr_desc_addr));
3237                         vmcs_write64(POSTED_INTR_DESC_ADDR,
3238                                      pfn_to_hpa(map->pfn) + offset_in_page(vmcs12->posted_intr_desc_addr));
3239                 } else {
3240                         /*
3241                          * Defer the KVM_INTERNAL_EXIT until KVM tries to
3242                          * access the contents of the VMCS12 posted interrupt
3243                          * descriptor. (Note that KVM may do this when it
3244                          * should not, per the architectural specification.)
3245                          */
3246                         vmx->nested.pi_desc = NULL;
3247                         pin_controls_clearbit(vmx, PIN_BASED_POSTED_INTR);
3248                 }
3249         }
3250         if (nested_vmx_prepare_msr_bitmap(vcpu, vmcs12))
3251                 exec_controls_setbit(vmx, CPU_BASED_USE_MSR_BITMAPS);
3252         else
3253                 exec_controls_clearbit(vmx, CPU_BASED_USE_MSR_BITMAPS);
3254
3255         return true;
3256 }
3257
3258 static bool vmx_get_nested_state_pages(struct kvm_vcpu *vcpu)
3259 {
3260         if (!nested_get_evmcs_page(vcpu)) {
3261                 pr_debug_ratelimited("%s: enlightened vmptrld failed\n",
3262                                      __func__);
3263                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
3264                 vcpu->run->internal.suberror =
3265                         KVM_INTERNAL_ERROR_EMULATION;
3266                 vcpu->run->internal.ndata = 0;
3267
3268                 return false;
3269         }
3270
3271         if (is_guest_mode(vcpu) && !nested_get_vmcs12_pages(vcpu))
3272                 return false;
3273
3274         return true;
3275 }
3276
3277 static int nested_vmx_write_pml_buffer(struct kvm_vcpu *vcpu, gpa_t gpa)
3278 {
3279         struct vmcs12 *vmcs12;
3280         struct vcpu_vmx *vmx = to_vmx(vcpu);
3281         gpa_t dst;
3282
3283         if (WARN_ON_ONCE(!is_guest_mode(vcpu)))
3284                 return 0;
3285
3286         if (WARN_ON_ONCE(vmx->nested.pml_full))
3287                 return 1;
3288
3289         /*
3290          * Check if PML is enabled for the nested guest. Whether eptp bit 6 is
3291          * set is already checked as part of A/D emulation.
3292          */
3293         vmcs12 = get_vmcs12(vcpu);
3294         if (!nested_cpu_has_pml(vmcs12))
3295                 return 0;
3296
3297         if (vmcs12->guest_pml_index >= PML_ENTITY_NUM) {
3298                 vmx->nested.pml_full = true;
3299                 return 1;
3300         }
3301
3302         gpa &= ~0xFFFull;
3303         dst = vmcs12->pml_address + sizeof(u64) * vmcs12->guest_pml_index;
3304
3305         if (kvm_write_guest_page(vcpu->kvm, gpa_to_gfn(dst), &gpa,
3306                                  offset_in_page(dst), sizeof(gpa)))
3307                 return 0;
3308
3309         vmcs12->guest_pml_index--;
3310
3311         return 0;
3312 }
3313
3314 /*
3315  * Intel's VMX Instruction Reference specifies a common set of prerequisites
3316  * for running VMX instructions (except VMXON, whose prerequisites are
3317  * slightly different). It also specifies what exception to inject otherwise.
3318  * Note that many of these exceptions have priority over VM exits, so they
3319  * don't have to be checked again here.
3320  */
3321 static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
3322 {
3323         if (!to_vmx(vcpu)->nested.vmxon) {
3324                 kvm_queue_exception(vcpu, UD_VECTOR);
3325                 return 0;
3326         }
3327
3328         if (vmx_get_cpl(vcpu)) {
3329                 kvm_inject_gp(vcpu, 0);
3330                 return 0;
3331         }
3332
3333         return 1;
3334 }
3335
3336 static u8 vmx_has_apicv_interrupt(struct kvm_vcpu *vcpu)
3337 {
3338         u8 rvi = vmx_get_rvi();
3339         u8 vppr = kvm_lapic_get_reg(vcpu->arch.apic, APIC_PROCPRI);
3340
3341         return ((rvi & 0xf0) > (vppr & 0xf0));
3342 }
3343
3344 static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
3345                                    struct vmcs12 *vmcs12);
3346
3347 /*
3348  * If from_vmentry is false, this is being called from state restore (either RSM
3349  * or KVM_SET_NESTED_STATE).  Otherwise it's called from vmlaunch/vmresume.
3350  *
3351  * Returns:
3352  *      NVMX_VMENTRY_SUCCESS: Entered VMX non-root mode
3353  *      NVMX_VMENTRY_VMFAIL:  Consistency check VMFail
3354  *      NVMX_VMENTRY_VMEXIT:  Consistency check VMExit
3355  *      NVMX_VMENTRY_KVM_INTERNAL_ERROR: KVM internal error
3356  */
3357 enum nvmx_vmentry_status nested_vmx_enter_non_root_mode(struct kvm_vcpu *vcpu,
3358                                                         bool from_vmentry)
3359 {
3360         struct vcpu_vmx *vmx = to_vmx(vcpu);
3361         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3362         enum vm_entry_failure_code entry_failure_code;
3363         bool evaluate_pending_interrupts;
3364         union vmx_exit_reason exit_reason = {
3365                 .basic = EXIT_REASON_INVALID_STATE,
3366                 .failed_vmentry = 1,
3367         };
3368         u32 failed_index;
3369
3370         trace_kvm_nested_vmenter(kvm_rip_read(vcpu),
3371                                  vmx->nested.current_vmptr,
3372                                  vmcs12->guest_rip,
3373                                  vmcs12->guest_intr_status,
3374                                  vmcs12->vm_entry_intr_info_field,
3375                                  vmcs12->secondary_vm_exec_control & SECONDARY_EXEC_ENABLE_EPT,
3376                                  vmcs12->ept_pointer,
3377                                  vmcs12->guest_cr3,
3378                                  KVM_ISA_VMX);
3379
3380         kvm_service_local_tlb_flush_requests(vcpu);
3381
3382         evaluate_pending_interrupts = exec_controls_get(vmx) &
3383                 (CPU_BASED_INTR_WINDOW_EXITING | CPU_BASED_NMI_WINDOW_EXITING);
3384         if (likely(!evaluate_pending_interrupts) && kvm_vcpu_apicv_active(vcpu))
3385                 evaluate_pending_interrupts |= vmx_has_apicv_interrupt(vcpu);
3386         if (!evaluate_pending_interrupts)
3387                 evaluate_pending_interrupts |= kvm_apic_has_pending_init_or_sipi(vcpu);
3388
3389         if (!vmx->nested.nested_run_pending ||
3390             !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS))
3391                 vmx->nested.pre_vmenter_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
3392         if (kvm_mpx_supported() &&
3393             (!vmx->nested.nested_run_pending ||
3394              !(vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)))
3395                 vmx->nested.pre_vmenter_bndcfgs = vmcs_read64(GUEST_BNDCFGS);
3396
3397         /*
3398          * Overwrite vmcs01.GUEST_CR3 with L1's CR3 if EPT is disabled *and*
3399          * nested early checks are disabled.  In the event of a "late" VM-Fail,
3400          * i.e. a VM-Fail detected by hardware but not KVM, KVM must unwind its
3401          * software model to the pre-VMEntry host state.  When EPT is disabled,
3402          * GUEST_CR3 holds KVM's shadow CR3, not L1's "real" CR3, which causes
3403          * nested_vmx_restore_host_state() to corrupt vcpu->arch.cr3.  Stuffing
3404          * vmcs01.GUEST_CR3 results in the unwind naturally setting arch.cr3 to
3405          * the correct value.  Smashing vmcs01.GUEST_CR3 is safe because nested
3406          * VM-Exits, and the unwind, reset KVM's MMU, i.e. vmcs01.GUEST_CR3 is
3407          * guaranteed to be overwritten with a shadow CR3 prior to re-entering
3408          * L1.  Don't stuff vmcs01.GUEST_CR3 when using nested early checks as
3409          * KVM modifies vcpu->arch.cr3 if and only if the early hardware checks
3410          * pass, and early VM-Fails do not reset KVM's MMU, i.e. the VM-Fail
3411          * path would need to manually save/restore vmcs01.GUEST_CR3.
3412          */
3413         if (!enable_ept && !nested_early_check)
3414                 vmcs_writel(GUEST_CR3, vcpu->arch.cr3);
3415
3416         vmx_switch_vmcs(vcpu, &vmx->nested.vmcs02);
3417
3418         prepare_vmcs02_early(vmx, &vmx->vmcs01, vmcs12);
3419
3420         if (from_vmentry) {
3421                 if (unlikely(!nested_get_vmcs12_pages(vcpu))) {
3422                         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
3423                         return NVMX_VMENTRY_KVM_INTERNAL_ERROR;
3424                 }
3425
3426                 if (nested_vmx_check_vmentry_hw(vcpu)) {
3427                         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
3428                         return NVMX_VMENTRY_VMFAIL;
3429                 }
3430
3431                 if (nested_vmx_check_guest_state(vcpu, vmcs12,
3432                                                  &entry_failure_code)) {
3433                         exit_reason.basic = EXIT_REASON_INVALID_STATE;
3434                         vmcs12->exit_qualification = entry_failure_code;
3435                         goto vmentry_fail_vmexit;
3436                 }
3437         }
3438
3439         enter_guest_mode(vcpu);
3440
3441         if (prepare_vmcs02(vcpu, vmcs12, from_vmentry, &entry_failure_code)) {
3442                 exit_reason.basic = EXIT_REASON_INVALID_STATE;
3443                 vmcs12->exit_qualification = entry_failure_code;
3444                 goto vmentry_fail_vmexit_guest_mode;
3445         }
3446
3447         if (from_vmentry) {
3448                 failed_index = nested_vmx_load_msr(vcpu,
3449                                                    vmcs12->vm_entry_msr_load_addr,
3450                                                    vmcs12->vm_entry_msr_load_count);
3451                 if (failed_index) {
3452                         exit_reason.basic = EXIT_REASON_MSR_LOAD_FAIL;
3453                         vmcs12->exit_qualification = failed_index;
3454                         goto vmentry_fail_vmexit_guest_mode;
3455                 }
3456         } else {
3457                 /*
3458                  * The MMU is not initialized to point at the right entities yet and
3459                  * "get pages" would need to read data from the guest (i.e. we will
3460                  * need to perform gpa to hpa translation). Request a call
3461                  * to nested_get_vmcs12_pages before the next VM-entry.  The MSRs
3462                  * have already been set at vmentry time and should not be reset.
3463                  */
3464                 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
3465         }
3466
3467         /*
3468          * Re-evaluate pending events if L1 had a pending IRQ/NMI/INIT/SIPI
3469          * when it executed VMLAUNCH/VMRESUME, as entering non-root mode can
3470          * effectively unblock various events, e.g. INIT/SIPI cause VM-Exit
3471          * unconditionally.
3472          */
3473         if (unlikely(evaluate_pending_interrupts))
3474                 kvm_make_request(KVM_REQ_EVENT, vcpu);
3475
3476         /*
3477          * Do not start the preemption timer hrtimer until after we know
3478          * we are successful, so that only nested_vmx_vmexit needs to cancel
3479          * the timer.
3480          */
3481         vmx->nested.preemption_timer_expired = false;
3482         if (nested_cpu_has_preemption_timer(vmcs12)) {
3483                 u64 timer_value = vmx_calc_preemption_timer_value(vcpu);
3484                 vmx_start_preemption_timer(vcpu, timer_value);
3485         }
3486
3487         /*
3488          * Note no nested_vmx_succeed or nested_vmx_fail here. At this point
3489          * we are no longer running L1, and VMLAUNCH/VMRESUME has not yet
3490          * returned as far as L1 is concerned. It will only return (and set
3491          * the success flag) when L2 exits (see nested_vmx_vmexit()).
3492          */
3493         return NVMX_VMENTRY_SUCCESS;
3494
3495         /*
3496          * A failed consistency check that leads to a VMExit during L1's
3497          * VMEnter to L2 is a variation of a normal VMexit, as explained in
3498          * 26.7 "VM-entry failures during or after loading guest state".
3499          */
3500 vmentry_fail_vmexit_guest_mode:
3501         if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETTING)
3502                 vcpu->arch.tsc_offset -= vmcs12->tsc_offset;
3503         leave_guest_mode(vcpu);
3504
3505 vmentry_fail_vmexit:
3506         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
3507
3508         if (!from_vmentry)
3509                 return NVMX_VMENTRY_VMEXIT;
3510
3511         load_vmcs12_host_state(vcpu, vmcs12);
3512         vmcs12->vm_exit_reason = exit_reason.full;
3513         if (enable_shadow_vmcs || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
3514                 vmx->nested.need_vmcs12_to_shadow_sync = true;
3515         return NVMX_VMENTRY_VMEXIT;
3516 }
3517
3518 /*
3519  * nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1
3520  * for running an L2 nested guest.
3521  */
3522 static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
3523 {
3524         struct vmcs12 *vmcs12;
3525         enum nvmx_vmentry_status status;
3526         struct vcpu_vmx *vmx = to_vmx(vcpu);
3527         u32 interrupt_shadow = vmx_get_interrupt_shadow(vcpu);
3528         enum nested_evmptrld_status evmptrld_status;
3529
3530         if (!nested_vmx_check_permission(vcpu))
3531                 return 1;
3532
3533         evmptrld_status = nested_vmx_handle_enlightened_vmptrld(vcpu, launch);
3534         if (evmptrld_status == EVMPTRLD_ERROR) {
3535                 kvm_queue_exception(vcpu, UD_VECTOR);
3536                 return 1;
3537         }
3538
3539         kvm_pmu_trigger_event(vcpu, PERF_COUNT_HW_BRANCH_INSTRUCTIONS);
3540
3541         if (CC(evmptrld_status == EVMPTRLD_VMFAIL))
3542                 return nested_vmx_failInvalid(vcpu);
3543
3544         if (CC(!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr) &&
3545                vmx->nested.current_vmptr == INVALID_GPA))
3546                 return nested_vmx_failInvalid(vcpu);
3547
3548         vmcs12 = get_vmcs12(vcpu);
3549
3550         /*
3551          * Can't VMLAUNCH or VMRESUME a shadow VMCS. Despite the fact
3552          * that there *is* a valid VMCS pointer, RFLAGS.CF is set
3553          * rather than RFLAGS.ZF, and no error number is stored to the
3554          * VM-instruction error field.
3555          */
3556         if (CC(vmcs12->hdr.shadow_vmcs))
3557                 return nested_vmx_failInvalid(vcpu);
3558
3559         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
3560                 copy_enlightened_to_vmcs12(vmx, vmx->nested.hv_evmcs->hv_clean_fields);
3561                 /* Enlightened VMCS doesn't have launch state */
3562                 vmcs12->launch_state = !launch;
3563         } else if (enable_shadow_vmcs) {
3564                 copy_shadow_to_vmcs12(vmx);
3565         }
3566
3567         /*
3568          * The nested entry process starts with enforcing various prerequisites
3569          * on vmcs12 as required by the Intel SDM, and act appropriately when
3570          * they fail: As the SDM explains, some conditions should cause the
3571          * instruction to fail, while others will cause the instruction to seem
3572          * to succeed, but return an EXIT_REASON_INVALID_STATE.
3573          * To speed up the normal (success) code path, we should avoid checking
3574          * for misconfigurations which will anyway be caught by the processor
3575          * when using the merged vmcs02.
3576          */
3577         if (CC(interrupt_shadow & KVM_X86_SHADOW_INT_MOV_SS))
3578                 return nested_vmx_fail(vcpu, VMXERR_ENTRY_EVENTS_BLOCKED_BY_MOV_SS);
3579
3580         if (CC(vmcs12->launch_state == launch))
3581                 return nested_vmx_fail(vcpu,
3582                         launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
3583                                : VMXERR_VMRESUME_NONLAUNCHED_VMCS);
3584
3585         if (nested_vmx_check_controls(vcpu, vmcs12))
3586                 return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
3587
3588         if (nested_vmx_check_address_space_size(vcpu, vmcs12))
3589                 return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
3590
3591         if (nested_vmx_check_host_state(vcpu, vmcs12))
3592                 return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
3593
3594         /*
3595          * We're finally done with prerequisite checking, and can start with
3596          * the nested entry.
3597          */
3598         vmx->nested.nested_run_pending = 1;
3599         vmx->nested.has_preemption_timer_deadline = false;
3600         status = nested_vmx_enter_non_root_mode(vcpu, true);
3601         if (unlikely(status != NVMX_VMENTRY_SUCCESS))
3602                 goto vmentry_failed;
3603
3604         /* Emulate processing of posted interrupts on VM-Enter. */
3605         if (nested_cpu_has_posted_intr(vmcs12) &&
3606             kvm_apic_has_interrupt(vcpu) == vmx->nested.posted_intr_nv) {
3607                 vmx->nested.pi_pending = true;
3608                 kvm_make_request(KVM_REQ_EVENT, vcpu);
3609                 kvm_apic_clear_irr(vcpu, vmx->nested.posted_intr_nv);
3610         }
3611
3612         /* Hide L1D cache contents from the nested guest.  */
3613         vmx->vcpu.arch.l1tf_flush_l1d = true;
3614
3615         /*
3616          * Must happen outside of nested_vmx_enter_non_root_mode() as it will
3617          * also be used as part of restoring nVMX state for
3618          * snapshot restore (migration).
3619          *
3620          * In this flow, it is assumed that vmcs12 cache was
3621          * transferred as part of captured nVMX state and should
3622          * therefore not be read from guest memory (which may not
3623          * exist on destination host yet).
3624          */
3625         nested_cache_shadow_vmcs12(vcpu, vmcs12);
3626
3627         switch (vmcs12->guest_activity_state) {
3628         case GUEST_ACTIVITY_HLT:
3629                 /*
3630                  * If we're entering a halted L2 vcpu and the L2 vcpu won't be
3631                  * awakened by event injection or by an NMI-window VM-exit or
3632                  * by an interrupt-window VM-exit, halt the vcpu.
3633                  */
3634                 if (!(vmcs12->vm_entry_intr_info_field & INTR_INFO_VALID_MASK) &&
3635                     !nested_cpu_has(vmcs12, CPU_BASED_NMI_WINDOW_EXITING) &&
3636                     !(nested_cpu_has(vmcs12, CPU_BASED_INTR_WINDOW_EXITING) &&
3637                       (vmcs12->guest_rflags & X86_EFLAGS_IF))) {
3638                         vmx->nested.nested_run_pending = 0;
3639                         return kvm_emulate_halt_noskip(vcpu);
3640                 }
3641                 break;
3642         case GUEST_ACTIVITY_WAIT_SIPI:
3643                 vmx->nested.nested_run_pending = 0;
3644                 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
3645                 break;
3646         default:
3647                 break;
3648         }
3649
3650         return 1;
3651
3652 vmentry_failed:
3653         vmx->nested.nested_run_pending = 0;
3654         if (status == NVMX_VMENTRY_KVM_INTERNAL_ERROR)
3655                 return 0;
3656         if (status == NVMX_VMENTRY_VMEXIT)
3657                 return 1;
3658         WARN_ON_ONCE(status != NVMX_VMENTRY_VMFAIL);
3659         return nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
3660 }
3661
3662 /*
3663  * On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date
3664  * because L2 may have changed some cr0 bits directly (CR0_GUEST_HOST_MASK).
3665  * This function returns the new value we should put in vmcs12.guest_cr0.
3666  * It's not enough to just return the vmcs02 GUEST_CR0. Rather,
3667  *  1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now
3668  *     available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0
3669  *     didn't trap the bit, because if L1 did, so would L0).
3670  *  2. Bits that L1 asked to trap (and therefore L0 also did) could not have
3671  *     been modified by L2, and L1 knows it. So just leave the old value of
3672  *     the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0
3673  *     isn't relevant, because if L0 traps this bit it can set it to anything.
3674  *  3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have
3675  *     changed these bits, and therefore they need to be updated, but L0
3676  *     didn't necessarily allow them to be changed in GUEST_CR0 - and rather
3677  *     put them in vmcs02 CR0_READ_SHADOW. So take these bits from there.
3678  */
3679 static inline unsigned long
3680 vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
3681 {
3682         return
3683         /*1*/   (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) |
3684         /*2*/   (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) |
3685         /*3*/   (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask |
3686                         vcpu->arch.cr0_guest_owned_bits));
3687 }
3688
3689 static inline unsigned long
3690 vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
3691 {
3692         return
3693         /*1*/   (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) |
3694         /*2*/   (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) |
3695         /*3*/   (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask |
3696                         vcpu->arch.cr4_guest_owned_bits));
3697 }
3698
3699 static void vmcs12_save_pending_event(struct kvm_vcpu *vcpu,
3700                                       struct vmcs12 *vmcs12,
3701                                       u32 vm_exit_reason, u32 exit_intr_info)
3702 {
3703         u32 idt_vectoring;
3704         unsigned int nr;
3705
3706         /*
3707          * Per the SDM, VM-Exits due to double and triple faults are never
3708          * considered to occur during event delivery, even if the double/triple
3709          * fault is the result of an escalating vectoring issue.
3710          *
3711          * Note, the SDM qualifies the double fault behavior with "The original
3712          * event results in a double-fault exception".  It's unclear why the
3713          * qualification exists since exits due to double fault can occur only
3714          * while vectoring a different exception (injected events are never
3715          * subject to interception), i.e. there's _always_ an original event.
3716          *
3717          * The SDM also uses NMI as a confusing example for the "original event
3718          * causes the VM exit directly" clause.  NMI isn't special in any way,
3719          * the same rule applies to all events that cause an exit directly.
3720          * NMI is an odd choice for the example because NMIs can only occur on
3721          * instruction boundaries, i.e. they _can't_ occur during vectoring.
3722          */
3723         if ((u16)vm_exit_reason == EXIT_REASON_TRIPLE_FAULT ||
3724             ((u16)vm_exit_reason == EXIT_REASON_EXCEPTION_NMI &&
3725              is_double_fault(exit_intr_info))) {
3726                 vmcs12->idt_vectoring_info_field = 0;
3727         } else if (vcpu->arch.exception.injected) {
3728                 nr = vcpu->arch.exception.vector;
3729                 idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
3730
3731                 if (kvm_exception_is_soft(nr)) {
3732                         vmcs12->vm_exit_instruction_len =
3733                                 vcpu->arch.event_exit_inst_len;
3734                         idt_vectoring |= INTR_TYPE_SOFT_EXCEPTION;
3735                 } else
3736                         idt_vectoring |= INTR_TYPE_HARD_EXCEPTION;
3737
3738                 if (vcpu->arch.exception.has_error_code) {
3739                         idt_vectoring |= VECTORING_INFO_DELIVER_CODE_MASK;
3740                         vmcs12->idt_vectoring_error_code =
3741                                 vcpu->arch.exception.error_code;
3742                 }
3743
3744                 vmcs12->idt_vectoring_info_field = idt_vectoring;
3745         } else if (vcpu->arch.nmi_injected) {
3746                 vmcs12->idt_vectoring_info_field =
3747                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR;
3748         } else if (vcpu->arch.interrupt.injected) {
3749                 nr = vcpu->arch.interrupt.nr;
3750                 idt_vectoring = nr | VECTORING_INFO_VALID_MASK;
3751
3752                 if (vcpu->arch.interrupt.soft) {
3753                         idt_vectoring |= INTR_TYPE_SOFT_INTR;
3754                         vmcs12->vm_entry_instruction_len =
3755                                 vcpu->arch.event_exit_inst_len;
3756                 } else
3757                         idt_vectoring |= INTR_TYPE_EXT_INTR;
3758
3759                 vmcs12->idt_vectoring_info_field = idt_vectoring;
3760         } else {
3761                 vmcs12->idt_vectoring_info_field = 0;
3762         }
3763 }
3764
3765
3766 void nested_mark_vmcs12_pages_dirty(struct kvm_vcpu *vcpu)
3767 {
3768         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3769         gfn_t gfn;
3770
3771         /*
3772          * Don't need to mark the APIC access page dirty; it is never
3773          * written to by the CPU during APIC virtualization.
3774          */
3775
3776         if (nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW)) {
3777                 gfn = vmcs12->virtual_apic_page_addr >> PAGE_SHIFT;
3778                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
3779         }
3780
3781         if (nested_cpu_has_posted_intr(vmcs12)) {
3782                 gfn = vmcs12->posted_intr_desc_addr >> PAGE_SHIFT;
3783                 kvm_vcpu_mark_page_dirty(vcpu, gfn);
3784         }
3785 }
3786
3787 static int vmx_complete_nested_posted_interrupt(struct kvm_vcpu *vcpu)
3788 {
3789         struct vcpu_vmx *vmx = to_vmx(vcpu);
3790         int max_irr;
3791         void *vapic_page;
3792         u16 status;
3793
3794         if (!vmx->nested.pi_pending)
3795                 return 0;
3796
3797         if (!vmx->nested.pi_desc)
3798                 goto mmio_needed;
3799
3800         vmx->nested.pi_pending = false;
3801
3802         if (!pi_test_and_clear_on(vmx->nested.pi_desc))
3803                 return 0;
3804
3805         max_irr = find_last_bit((unsigned long *)vmx->nested.pi_desc->pir, 256);
3806         if (max_irr != 256) {
3807                 vapic_page = vmx->nested.virtual_apic_map.hva;
3808                 if (!vapic_page)
3809                         goto mmio_needed;
3810
3811                 __kvm_apic_update_irr(vmx->nested.pi_desc->pir,
3812                         vapic_page, &max_irr);
3813                 status = vmcs_read16(GUEST_INTR_STATUS);
3814                 if ((u8)max_irr > ((u8)status & 0xff)) {
3815                         status &= ~0xff;
3816                         status |= (u8)max_irr;
3817                         vmcs_write16(GUEST_INTR_STATUS, status);
3818                 }
3819         }
3820
3821         nested_mark_vmcs12_pages_dirty(vcpu);
3822         return 0;
3823
3824 mmio_needed:
3825         kvm_handle_memory_failure(vcpu, X86EMUL_IO_NEEDED, NULL);
3826         return -ENXIO;
3827 }
3828
3829 static void nested_vmx_inject_exception_vmexit(struct kvm_vcpu *vcpu)
3830 {
3831         struct kvm_queued_exception *ex = &vcpu->arch.exception_vmexit;
3832         u32 intr_info = ex->vector | INTR_INFO_VALID_MASK;
3833         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
3834         unsigned long exit_qual;
3835
3836         if (ex->has_payload) {
3837                 exit_qual = ex->payload;
3838         } else if (ex->vector == PF_VECTOR) {
3839                 exit_qual = vcpu->arch.cr2;
3840         } else if (ex->vector == DB_VECTOR) {
3841                 exit_qual = vcpu->arch.dr6;
3842                 exit_qual &= ~DR6_BT;
3843                 exit_qual ^= DR6_ACTIVE_LOW;
3844         } else {
3845                 exit_qual = 0;
3846         }
3847
3848         /*
3849          * Unlike AMD's Paged Real Mode, which reports an error code on #PF
3850          * VM-Exits even if the CPU is in Real Mode, Intel VMX never sets the
3851          * "has error code" flags on VM-Exit if the CPU is in Real Mode.
3852          */
3853         if (ex->has_error_code && is_protmode(vcpu)) {
3854                 /*
3855                  * Intel CPUs do not generate error codes with bits 31:16 set,
3856                  * and more importantly VMX disallows setting bits 31:16 in the
3857                  * injected error code for VM-Entry.  Drop the bits to mimic
3858                  * hardware and avoid inducing failure on nested VM-Entry if L1
3859                  * chooses to inject the exception back to L2.  AMD CPUs _do_
3860                  * generate "full" 32-bit error codes, so KVM allows userspace
3861                  * to inject exception error codes with bits 31:16 set.
3862                  */
3863                 vmcs12->vm_exit_intr_error_code = (u16)ex->error_code;
3864                 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
3865         }
3866
3867         if (kvm_exception_is_soft(ex->vector))
3868                 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
3869         else
3870                 intr_info |= INTR_TYPE_HARD_EXCEPTION;
3871
3872         if (!(vmcs12->idt_vectoring_info_field & VECTORING_INFO_VALID_MASK) &&
3873             vmx_get_nmi_mask(vcpu))
3874                 intr_info |= INTR_INFO_UNBLOCK_NMI;
3875
3876         nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI, intr_info, exit_qual);
3877 }
3878
3879 /*
3880  * Returns true if a debug trap is (likely) pending delivery.  Infer the class
3881  * of a #DB (trap-like vs. fault-like) from the exception payload (to-be-DR6).
3882  * Using the payload is flawed because code breakpoints (fault-like) and data
3883  * breakpoints (trap-like) set the same bits in DR6 (breakpoint detected), i.e.
3884  * this will return false positives if a to-be-injected code breakpoint #DB is
3885  * pending (from KVM's perspective, but not "pending" across an instruction
3886  * boundary).  ICEBP, a.k.a. INT1, is also not reflected here even though it
3887  * too is trap-like.
3888  *
3889  * KVM "works" despite these flaws as ICEBP isn't currently supported by the
3890  * emulator, Monitor Trap Flag is not marked pending on intercepted #DBs (the
3891  * #DB has already happened), and MTF isn't marked pending on code breakpoints
3892  * from the emulator (because such #DBs are fault-like and thus don't trigger
3893  * actions that fire on instruction retire).
3894  */
3895 static unsigned long vmx_get_pending_dbg_trap(struct kvm_queued_exception *ex)
3896 {
3897         if (!ex->pending || ex->vector != DB_VECTOR)
3898                 return 0;
3899
3900         /* General Detect #DBs are always fault-like. */
3901         return ex->payload & ~DR6_BD;
3902 }
3903
3904 /*
3905  * Returns true if there's a pending #DB exception that is lower priority than
3906  * a pending Monitor Trap Flag VM-Exit.  TSS T-flag #DBs are not emulated by
3907  * KVM, but could theoretically be injected by userspace.  Note, this code is
3908  * imperfect, see above.
3909  */
3910 static bool vmx_is_low_priority_db_trap(struct kvm_queued_exception *ex)
3911 {
3912         return vmx_get_pending_dbg_trap(ex) & ~DR6_BT;
3913 }
3914
3915 /*
3916  * Certain VM-exits set the 'pending debug exceptions' field to indicate a
3917  * recognized #DB (data or single-step) that has yet to be delivered. Since KVM
3918  * represents these debug traps with a payload that is said to be compatible
3919  * with the 'pending debug exceptions' field, write the payload to the VMCS
3920  * field if a VM-exit is delivered before the debug trap.
3921  */
3922 static void nested_vmx_update_pending_dbg(struct kvm_vcpu *vcpu)
3923 {
3924         unsigned long pending_dbg;
3925
3926         pending_dbg = vmx_get_pending_dbg_trap(&vcpu->arch.exception);
3927         if (pending_dbg)
3928                 vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS, pending_dbg);
3929 }
3930
3931 static bool nested_vmx_preemption_timer_pending(struct kvm_vcpu *vcpu)
3932 {
3933         return nested_cpu_has_preemption_timer(get_vmcs12(vcpu)) &&
3934                to_vmx(vcpu)->nested.preemption_timer_expired;
3935 }
3936
3937 static bool vmx_has_nested_events(struct kvm_vcpu *vcpu)
3938 {
3939         return nested_vmx_preemption_timer_pending(vcpu) ||
3940                to_vmx(vcpu)->nested.mtf_pending;
3941 }
3942
3943 /*
3944  * Per the Intel SDM's table "Priority Among Concurrent Events", with minor
3945  * edits to fill in missing examples, e.g. #DB due to split-lock accesses,
3946  * and less minor edits to splice in the priority of VMX Non-Root specific
3947  * events, e.g. MTF and NMI/INTR-window exiting.
3948  *
3949  * 1 Hardware Reset and Machine Checks
3950  *      - RESET
3951  *      - Machine Check
3952  *
3953  * 2 Trap on Task Switch
3954  *      - T flag in TSS is set (on task switch)
3955  *
3956  * 3 External Hardware Interventions
3957  *      - FLUSH
3958  *      - STOPCLK
3959  *      - SMI
3960  *      - INIT
3961  *
3962  * 3.5 Monitor Trap Flag (MTF) VM-exit[1]
3963  *
3964  * 4 Traps on Previous Instruction
3965  *      - Breakpoints
3966  *      - Trap-class Debug Exceptions (#DB due to TF flag set, data/I-O
3967  *        breakpoint, or #DB due to a split-lock access)
3968  *
3969  * 4.3  VMX-preemption timer expired VM-exit
3970  *
3971  * 4.6  NMI-window exiting VM-exit[2]
3972  *
3973  * 5 Nonmaskable Interrupts (NMI)
3974  *
3975  * 5.5 Interrupt-window exiting VM-exit and Virtual-interrupt delivery
3976  *
3977  * 6 Maskable Hardware Interrupts
3978  *
3979  * 7 Code Breakpoint Fault
3980  *
3981  * 8 Faults from Fetching Next Instruction
3982  *      - Code-Segment Limit Violation
3983  *      - Code Page Fault
3984  *      - Control protection exception (missing ENDBRANCH at target of indirect
3985  *                                      call or jump)
3986  *
3987  * 9 Faults from Decoding Next Instruction
3988  *      - Instruction length > 15 bytes
3989  *      - Invalid Opcode
3990  *      - Coprocessor Not Available
3991  *
3992  *10 Faults on Executing Instruction
3993  *      - Overflow
3994  *      - Bound error
3995  *      - Invalid TSS
3996  *      - Segment Not Present
3997  *      - Stack fault
3998  *      - General Protection
3999  *      - Data Page Fault
4000  *      - Alignment Check
4001  *      - x86 FPU Floating-point exception
4002  *      - SIMD floating-point exception
4003  *      - Virtualization exception
4004  *      - Control protection exception
4005  *
4006  * [1] Per the "Monitor Trap Flag" section: System-management interrupts (SMIs),
4007  *     INIT signals, and higher priority events take priority over MTF VM exits.
4008  *     MTF VM exits take priority over debug-trap exceptions and lower priority
4009  *     events.
4010  *
4011  * [2] Debug-trap exceptions and higher priority events take priority over VM exits
4012  *     caused by the VMX-preemption timer.  VM exits caused by the VMX-preemption
4013  *     timer take priority over VM exits caused by the "NMI-window exiting"
4014  *     VM-execution control and lower priority events.
4015  *
4016  * [3] Debug-trap exceptions and higher priority events take priority over VM exits
4017  *     caused by "NMI-window exiting".  VM exits caused by this control take
4018  *     priority over non-maskable interrupts (NMIs) and lower priority events.
4019  *
4020  * [4] Virtual-interrupt delivery has the same priority as that of VM exits due to
4021  *     the 1-setting of the "interrupt-window exiting" VM-execution control.  Thus,
4022  *     non-maskable interrupts (NMIs) and higher priority events take priority over
4023  *     delivery of a virtual interrupt; delivery of a virtual interrupt takes
4024  *     priority over external interrupts and lower priority events.
4025  */
4026 static int vmx_check_nested_events(struct kvm_vcpu *vcpu)
4027 {
4028         struct kvm_lapic *apic = vcpu->arch.apic;
4029         struct vcpu_vmx *vmx = to_vmx(vcpu);
4030         /*
4031          * Only a pending nested run blocks a pending exception.  If there is a
4032          * previously injected event, the pending exception occurred while said
4033          * event was being delivered and thus needs to be handled.
4034          */
4035         bool block_nested_exceptions = vmx->nested.nested_run_pending;
4036         /*
4037          * New events (not exceptions) are only recognized at instruction
4038          * boundaries.  If an event needs reinjection, then KVM is handling a
4039          * VM-Exit that occurred _during_ instruction execution; new events are
4040          * blocked until the instruction completes.
4041          */
4042         bool block_nested_events = block_nested_exceptions ||
4043                                    kvm_event_needs_reinjection(vcpu);
4044
4045         if (lapic_in_kernel(vcpu) &&
4046                 test_bit(KVM_APIC_INIT, &apic->pending_events)) {
4047                 if (block_nested_events)
4048                         return -EBUSY;
4049                 nested_vmx_update_pending_dbg(vcpu);
4050                 clear_bit(KVM_APIC_INIT, &apic->pending_events);
4051                 if (vcpu->arch.mp_state != KVM_MP_STATE_INIT_RECEIVED)
4052                         nested_vmx_vmexit(vcpu, EXIT_REASON_INIT_SIGNAL, 0, 0);
4053
4054                 /* MTF is discarded if the vCPU is in WFS. */
4055                 vmx->nested.mtf_pending = false;
4056                 return 0;
4057         }
4058
4059         if (lapic_in_kernel(vcpu) &&
4060             test_bit(KVM_APIC_SIPI, &apic->pending_events)) {
4061                 if (block_nested_events)
4062                         return -EBUSY;
4063
4064                 clear_bit(KVM_APIC_SIPI, &apic->pending_events);
4065                 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
4066                         nested_vmx_vmexit(vcpu, EXIT_REASON_SIPI_SIGNAL, 0,
4067                                                 apic->sipi_vector & 0xFFUL);
4068                         return 0;
4069                 }
4070                 /* Fallthrough, the SIPI is completely ignored. */
4071         }
4072
4073         /*
4074          * Process exceptions that are higher priority than Monitor Trap Flag:
4075          * fault-like exceptions, TSS T flag #DB (not emulated by KVM, but
4076          * could theoretically come in from userspace), and ICEBP (INT1).
4077          *
4078          * TODO: SMIs have higher priority than MTF and trap-like #DBs (except
4079          * for TSS T flag #DBs).  KVM also doesn't save/restore pending MTF
4080          * across SMI/RSM as it should; that needs to be addressed in order to
4081          * prioritize SMI over MTF and trap-like #DBs.
4082          */
4083         if (vcpu->arch.exception_vmexit.pending &&
4084             !vmx_is_low_priority_db_trap(&vcpu->arch.exception_vmexit)) {
4085                 if (block_nested_exceptions)
4086                         return -EBUSY;
4087
4088                 nested_vmx_inject_exception_vmexit(vcpu);
4089                 return 0;
4090         }
4091
4092         if (vcpu->arch.exception.pending &&
4093             !vmx_is_low_priority_db_trap(&vcpu->arch.exception)) {
4094                 if (block_nested_exceptions)
4095                         return -EBUSY;
4096                 goto no_vmexit;
4097         }
4098
4099         if (vmx->nested.mtf_pending) {
4100                 if (block_nested_events)
4101                         return -EBUSY;
4102                 nested_vmx_update_pending_dbg(vcpu);
4103                 nested_vmx_vmexit(vcpu, EXIT_REASON_MONITOR_TRAP_FLAG, 0, 0);
4104                 return 0;
4105         }
4106
4107         if (vcpu->arch.exception_vmexit.pending) {
4108                 if (block_nested_exceptions)
4109                         return -EBUSY;
4110
4111                 nested_vmx_inject_exception_vmexit(vcpu);
4112                 return 0;
4113         }
4114
4115         if (vcpu->arch.exception.pending) {
4116                 if (block_nested_exceptions)
4117                         return -EBUSY;
4118                 goto no_vmexit;
4119         }
4120
4121         if (nested_vmx_preemption_timer_pending(vcpu)) {
4122                 if (block_nested_events)
4123                         return -EBUSY;
4124                 nested_vmx_vmexit(vcpu, EXIT_REASON_PREEMPTION_TIMER, 0, 0);
4125                 return 0;
4126         }
4127
4128         if (vcpu->arch.smi_pending && !is_smm(vcpu)) {
4129                 if (block_nested_events)
4130                         return -EBUSY;
4131                 goto no_vmexit;
4132         }
4133
4134         if (vcpu->arch.nmi_pending && !vmx_nmi_blocked(vcpu)) {
4135                 if (block_nested_events)
4136                         return -EBUSY;
4137                 if (!nested_exit_on_nmi(vcpu))
4138                         goto no_vmexit;
4139
4140                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
4141                                   NMI_VECTOR | INTR_TYPE_NMI_INTR |
4142                                   INTR_INFO_VALID_MASK, 0);
4143                 /*
4144                  * The NMI-triggered VM exit counts as injection:
4145                  * clear this one and block further NMIs.
4146                  */
4147                 vcpu->arch.nmi_pending = 0;
4148                 vmx_set_nmi_mask(vcpu, true);
4149                 return 0;
4150         }
4151
4152         if (kvm_cpu_has_interrupt(vcpu) && !vmx_interrupt_blocked(vcpu)) {
4153                 if (block_nested_events)
4154                         return -EBUSY;
4155                 if (!nested_exit_on_intr(vcpu))
4156                         goto no_vmexit;
4157                 nested_vmx_vmexit(vcpu, EXIT_REASON_EXTERNAL_INTERRUPT, 0, 0);
4158                 return 0;
4159         }
4160
4161 no_vmexit:
4162         return vmx_complete_nested_posted_interrupt(vcpu);
4163 }
4164
4165 static u32 vmx_get_preemption_timer_value(struct kvm_vcpu *vcpu)
4166 {
4167         ktime_t remaining =
4168                 hrtimer_get_remaining(&to_vmx(vcpu)->nested.preemption_timer);
4169         u64 value;
4170
4171         if (ktime_to_ns(remaining) <= 0)
4172                 return 0;
4173
4174         value = ktime_to_ns(remaining) * vcpu->arch.virtual_tsc_khz;
4175         do_div(value, 1000000);
4176         return value >> VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE;
4177 }
4178
4179 static bool is_vmcs12_ext_field(unsigned long field)
4180 {
4181         switch (field) {
4182         case GUEST_ES_SELECTOR:
4183         case GUEST_CS_SELECTOR:
4184         case GUEST_SS_SELECTOR:
4185         case GUEST_DS_SELECTOR:
4186         case GUEST_FS_SELECTOR:
4187         case GUEST_GS_SELECTOR:
4188         case GUEST_LDTR_SELECTOR:
4189         case GUEST_TR_SELECTOR:
4190         case GUEST_ES_LIMIT:
4191         case GUEST_CS_LIMIT:
4192         case GUEST_SS_LIMIT:
4193         case GUEST_DS_LIMIT:
4194         case GUEST_FS_LIMIT:
4195         case GUEST_GS_LIMIT:
4196         case GUEST_LDTR_LIMIT:
4197         case GUEST_TR_LIMIT:
4198         case GUEST_GDTR_LIMIT:
4199         case GUEST_IDTR_LIMIT:
4200         case GUEST_ES_AR_BYTES:
4201         case GUEST_DS_AR_BYTES:
4202         case GUEST_FS_AR_BYTES:
4203         case GUEST_GS_AR_BYTES:
4204         case GUEST_LDTR_AR_BYTES:
4205         case GUEST_TR_AR_BYTES:
4206         case GUEST_ES_BASE:
4207         case GUEST_CS_BASE:
4208         case GUEST_SS_BASE:
4209         case GUEST_DS_BASE:
4210         case GUEST_FS_BASE:
4211         case GUEST_GS_BASE:
4212         case GUEST_LDTR_BASE:
4213         case GUEST_TR_BASE:
4214         case GUEST_GDTR_BASE:
4215         case GUEST_IDTR_BASE:
4216         case GUEST_PENDING_DBG_EXCEPTIONS:
4217         case GUEST_BNDCFGS:
4218                 return true;
4219         default:
4220                 break;
4221         }
4222
4223         return false;
4224 }
4225
4226 static void sync_vmcs02_to_vmcs12_rare(struct kvm_vcpu *vcpu,
4227                                        struct vmcs12 *vmcs12)
4228 {
4229         struct vcpu_vmx *vmx = to_vmx(vcpu);
4230
4231         vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
4232         vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
4233         vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
4234         vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
4235         vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
4236         vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
4237         vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
4238         vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
4239         vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT);
4240         vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT);
4241         vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT);
4242         vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT);
4243         vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT);
4244         vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT);
4245         vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT);
4246         vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT);
4247         vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT);
4248         vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT);
4249         vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES);
4250         vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES);
4251         vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES);
4252         vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES);
4253         vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES);
4254         vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES);
4255         vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE);
4256         vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE);
4257         vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE);
4258         vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE);
4259         vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE);
4260         vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE);
4261         vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE);
4262         vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE);
4263         vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE);
4264         vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
4265         vmcs12->guest_pending_dbg_exceptions =
4266                 vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS);
4267
4268         vmx->nested.need_sync_vmcs02_to_vmcs12_rare = false;
4269 }
4270
4271 static void copy_vmcs02_to_vmcs12_rare(struct kvm_vcpu *vcpu,
4272                                        struct vmcs12 *vmcs12)
4273 {
4274         struct vcpu_vmx *vmx = to_vmx(vcpu);
4275         int cpu;
4276
4277         if (!vmx->nested.need_sync_vmcs02_to_vmcs12_rare)
4278                 return;
4279
4280
4281         WARN_ON_ONCE(vmx->loaded_vmcs != &vmx->vmcs01);
4282
4283         cpu = get_cpu();
4284         vmx->loaded_vmcs = &vmx->nested.vmcs02;
4285         vmx_vcpu_load_vmcs(vcpu, cpu, &vmx->vmcs01);
4286
4287         sync_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
4288
4289         vmx->loaded_vmcs = &vmx->vmcs01;
4290         vmx_vcpu_load_vmcs(vcpu, cpu, &vmx->nested.vmcs02);
4291         put_cpu();
4292 }
4293
4294 /*
4295  * Update the guest state fields of vmcs12 to reflect changes that
4296  * occurred while L2 was running. (The "IA-32e mode guest" bit of the
4297  * VM-entry controls is also updated, since this is really a guest
4298  * state bit.)
4299  */
4300 static void sync_vmcs02_to_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
4301 {
4302         struct vcpu_vmx *vmx = to_vmx(vcpu);
4303
4304         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
4305                 sync_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
4306
4307         vmx->nested.need_sync_vmcs02_to_vmcs12_rare =
4308                 !evmptr_is_valid(vmx->nested.hv_evmcs_vmptr);
4309
4310         vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12);
4311         vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12);
4312
4313         vmcs12->guest_rsp = kvm_rsp_read(vcpu);
4314         vmcs12->guest_rip = kvm_rip_read(vcpu);
4315         vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS);
4316
4317         vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES);
4318         vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES);
4319
4320         vmcs12->guest_interruptibility_info =
4321                 vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
4322
4323         if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
4324                 vmcs12->guest_activity_state = GUEST_ACTIVITY_HLT;
4325         else if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED)
4326                 vmcs12->guest_activity_state = GUEST_ACTIVITY_WAIT_SIPI;
4327         else
4328                 vmcs12->guest_activity_state = GUEST_ACTIVITY_ACTIVE;
4329
4330         if (nested_cpu_has_preemption_timer(vmcs12) &&
4331             vmcs12->vm_exit_controls & VM_EXIT_SAVE_VMX_PREEMPTION_TIMER &&
4332             !vmx->nested.nested_run_pending)
4333                 vmcs12->vmx_preemption_timer_value =
4334                         vmx_get_preemption_timer_value(vcpu);
4335
4336         /*
4337          * In some cases (usually, nested EPT), L2 is allowed to change its
4338          * own CR3 without exiting. If it has changed it, we must keep it.
4339          * Of course, if L0 is using shadow page tables, GUEST_CR3 was defined
4340          * by L0, not L1 or L2, so we mustn't unconditionally copy it to vmcs12.
4341          *
4342          * Additionally, restore L2's PDPTR to vmcs12.
4343          */
4344         if (enable_ept) {
4345                 vmcs12->guest_cr3 = vmcs_readl(GUEST_CR3);
4346                 if (nested_cpu_has_ept(vmcs12) && is_pae_paging(vcpu)) {
4347                         vmcs12->guest_pdptr0 = vmcs_read64(GUEST_PDPTR0);
4348                         vmcs12->guest_pdptr1 = vmcs_read64(GUEST_PDPTR1);
4349                         vmcs12->guest_pdptr2 = vmcs_read64(GUEST_PDPTR2);
4350                         vmcs12->guest_pdptr3 = vmcs_read64(GUEST_PDPTR3);
4351                 }
4352         }
4353
4354         vmcs12->guest_linear_address = vmcs_readl(GUEST_LINEAR_ADDRESS);
4355
4356         if (nested_cpu_has_vid(vmcs12))
4357                 vmcs12->guest_intr_status = vmcs_read16(GUEST_INTR_STATUS);
4358
4359         vmcs12->vm_entry_controls =
4360                 (vmcs12->vm_entry_controls & ~VM_ENTRY_IA32E_MODE) |
4361                 (vm_entry_controls_get(to_vmx(vcpu)) & VM_ENTRY_IA32E_MODE);
4362
4363         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_DEBUG_CONTROLS)
4364                 kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7);
4365
4366         if (vmcs12->vm_exit_controls & VM_EXIT_SAVE_IA32_EFER)
4367                 vmcs12->guest_ia32_efer = vcpu->arch.efer;
4368 }
4369
4370 /*
4371  * prepare_vmcs12 is part of what we need to do when the nested L2 guest exits
4372  * and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12),
4373  * and this function updates it to reflect the changes to the guest state while
4374  * L2 was running (and perhaps made some exits which were handled directly by L0
4375  * without going back to L1), and to reflect the exit reason.
4376  * Note that we do not have to copy here all VMCS fields, just those that
4377  * could have changed by the L2 guest or the exit - i.e., the guest-state and
4378  * exit-information fields only. Other fields are modified by L1 with VMWRITE,
4379  * which already writes to vmcs12 directly.
4380  */
4381 static void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
4382                            u32 vm_exit_reason, u32 exit_intr_info,
4383                            unsigned long exit_qualification)
4384 {
4385         /* update exit information fields: */
4386         vmcs12->vm_exit_reason = vm_exit_reason;
4387         if (to_vmx(vcpu)->exit_reason.enclave_mode)
4388                 vmcs12->vm_exit_reason |= VMX_EXIT_REASONS_SGX_ENCLAVE_MODE;
4389         vmcs12->exit_qualification = exit_qualification;
4390
4391         /*
4392          * On VM-Exit due to a failed VM-Entry, the VMCS isn't marked launched
4393          * and only EXIT_REASON and EXIT_QUALIFICATION are updated, all other
4394          * exit info fields are unmodified.
4395          */
4396         if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY)) {
4397                 vmcs12->launch_state = 1;
4398
4399                 /* vm_entry_intr_info_field is cleared on exit. Emulate this
4400                  * instead of reading the real value. */
4401                 vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK;
4402
4403                 /*
4404                  * Transfer the event that L0 or L1 may wanted to inject into
4405                  * L2 to IDT_VECTORING_INFO_FIELD.
4406                  */
4407                 vmcs12_save_pending_event(vcpu, vmcs12,
4408                                           vm_exit_reason, exit_intr_info);
4409
4410                 vmcs12->vm_exit_intr_info = exit_intr_info;
4411                 vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
4412                 vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
4413
4414                 /*
4415                  * According to spec, there's no need to store the guest's
4416                  * MSRs if the exit is due to a VM-entry failure that occurs
4417                  * during or after loading the guest state. Since this exit
4418                  * does not fall in that category, we need to save the MSRs.
4419                  */
4420                 if (nested_vmx_store_msr(vcpu,
4421                                          vmcs12->vm_exit_msr_store_addr,
4422                                          vmcs12->vm_exit_msr_store_count))
4423                         nested_vmx_abort(vcpu,
4424                                          VMX_ABORT_SAVE_GUEST_MSR_FAIL);
4425         }
4426 }
4427
4428 /*
4429  * A part of what we need to when the nested L2 guest exits and we want to
4430  * run its L1 parent, is to reset L1's guest state to the host state specified
4431  * in vmcs12.
4432  * This function is to be called not only on normal nested exit, but also on
4433  * a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry
4434  * Failures During or After Loading Guest State").
4435  * This function should be called when the active VMCS is L1's (vmcs01).
4436  */
4437 static void load_vmcs12_host_state(struct kvm_vcpu *vcpu,
4438                                    struct vmcs12 *vmcs12)
4439 {
4440         enum vm_entry_failure_code ignored;
4441         struct kvm_segment seg;
4442
4443         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER)
4444                 vcpu->arch.efer = vmcs12->host_ia32_efer;
4445         else if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
4446                 vcpu->arch.efer |= (EFER_LMA | EFER_LME);
4447         else
4448                 vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
4449         vmx_set_efer(vcpu, vcpu->arch.efer);
4450
4451         kvm_rsp_write(vcpu, vmcs12->host_rsp);
4452         kvm_rip_write(vcpu, vmcs12->host_rip);
4453         vmx_set_rflags(vcpu, X86_EFLAGS_FIXED);
4454         vmx_set_interrupt_shadow(vcpu, 0);
4455
4456         /*
4457          * Note that calling vmx_set_cr0 is important, even if cr0 hasn't
4458          * actually changed, because vmx_set_cr0 refers to efer set above.
4459          *
4460          * CR0_GUEST_HOST_MASK is already set in the original vmcs01
4461          * (KVM doesn't change it);
4462          */
4463         vcpu->arch.cr0_guest_owned_bits = vmx_l1_guest_owned_cr0_bits();
4464         vmx_set_cr0(vcpu, vmcs12->host_cr0);
4465
4466         /* Same as above - no reason to call set_cr4_guest_host_mask().  */
4467         vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK);
4468         vmx_set_cr4(vcpu, vmcs12->host_cr4);
4469
4470         nested_ept_uninit_mmu_context(vcpu);
4471
4472         /*
4473          * Only PDPTE load can fail as the value of cr3 was checked on entry and
4474          * couldn't have changed.
4475          */
4476         if (nested_vmx_load_cr3(vcpu, vmcs12->host_cr3, false, true, &ignored))
4477                 nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_PDPTE_FAIL);
4478
4479         nested_vmx_transition_tlb_flush(vcpu, vmcs12, false);
4480
4481         vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs);
4482         vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp);
4483         vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip);
4484         vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base);
4485         vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base);
4486         vmcs_write32(GUEST_IDTR_LIMIT, 0xFFFF);
4487         vmcs_write32(GUEST_GDTR_LIMIT, 0xFFFF);
4488
4489         /* If not VM_EXIT_CLEAR_BNDCFGS, the L2 value propagates to L1.  */
4490         if (vmcs12->vm_exit_controls & VM_EXIT_CLEAR_BNDCFGS)
4491                 vmcs_write64(GUEST_BNDCFGS, 0);
4492
4493         if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT) {
4494                 vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat);
4495                 vcpu->arch.pat = vmcs12->host_ia32_pat;
4496         }
4497         if ((vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL) &&
4498             intel_pmu_has_perf_global_ctrl(vcpu_to_pmu(vcpu)))
4499                 WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
4500                                          vmcs12->host_ia32_perf_global_ctrl));
4501
4502         /* Set L1 segment info according to Intel SDM
4503             27.5.2 Loading Host Segment and Descriptor-Table Registers */
4504         seg = (struct kvm_segment) {
4505                 .base = 0,
4506                 .limit = 0xFFFFFFFF,
4507                 .selector = vmcs12->host_cs_selector,
4508                 .type = 11,
4509                 .present = 1,
4510                 .s = 1,
4511                 .g = 1
4512         };
4513         if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
4514                 seg.l = 1;
4515         else
4516                 seg.db = 1;
4517         __vmx_set_segment(vcpu, &seg, VCPU_SREG_CS);
4518         seg = (struct kvm_segment) {
4519                 .base = 0,
4520                 .limit = 0xFFFFFFFF,
4521                 .type = 3,
4522                 .present = 1,
4523                 .s = 1,
4524                 .db = 1,
4525                 .g = 1
4526         };
4527         seg.selector = vmcs12->host_ds_selector;
4528         __vmx_set_segment(vcpu, &seg, VCPU_SREG_DS);
4529         seg.selector = vmcs12->host_es_selector;
4530         __vmx_set_segment(vcpu, &seg, VCPU_SREG_ES);
4531         seg.selector = vmcs12->host_ss_selector;
4532         __vmx_set_segment(vcpu, &seg, VCPU_SREG_SS);
4533         seg.selector = vmcs12->host_fs_selector;
4534         seg.base = vmcs12->host_fs_base;
4535         __vmx_set_segment(vcpu, &seg, VCPU_SREG_FS);
4536         seg.selector = vmcs12->host_gs_selector;
4537         seg.base = vmcs12->host_gs_base;
4538         __vmx_set_segment(vcpu, &seg, VCPU_SREG_GS);
4539         seg = (struct kvm_segment) {
4540                 .base = vmcs12->host_tr_base,
4541                 .limit = 0x67,
4542                 .selector = vmcs12->host_tr_selector,
4543                 .type = 11,
4544                 .present = 1
4545         };
4546         __vmx_set_segment(vcpu, &seg, VCPU_SREG_TR);
4547
4548         memset(&seg, 0, sizeof(seg));
4549         seg.unusable = 1;
4550         __vmx_set_segment(vcpu, &seg, VCPU_SREG_LDTR);
4551
4552         kvm_set_dr(vcpu, 7, 0x400);
4553         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
4554
4555         if (nested_vmx_load_msr(vcpu, vmcs12->vm_exit_msr_load_addr,
4556                                 vmcs12->vm_exit_msr_load_count))
4557                 nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL);
4558
4559         to_vmx(vcpu)->emulation_required = vmx_emulation_required(vcpu);
4560 }
4561
4562 static inline u64 nested_vmx_get_vmcs01_guest_efer(struct vcpu_vmx *vmx)
4563 {
4564         struct vmx_uret_msr *efer_msr;
4565         unsigned int i;
4566
4567         if (vm_entry_controls_get(vmx) & VM_ENTRY_LOAD_IA32_EFER)
4568                 return vmcs_read64(GUEST_IA32_EFER);
4569
4570         if (cpu_has_load_ia32_efer())
4571                 return host_efer;
4572
4573         for (i = 0; i < vmx->msr_autoload.guest.nr; ++i) {
4574                 if (vmx->msr_autoload.guest.val[i].index == MSR_EFER)
4575                         return vmx->msr_autoload.guest.val[i].value;
4576         }
4577
4578         efer_msr = vmx_find_uret_msr(vmx, MSR_EFER);
4579         if (efer_msr)
4580                 return efer_msr->data;
4581
4582         return host_efer;
4583 }
4584
4585 static void nested_vmx_restore_host_state(struct kvm_vcpu *vcpu)
4586 {
4587         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
4588         struct vcpu_vmx *vmx = to_vmx(vcpu);
4589         struct vmx_msr_entry g, h;
4590         gpa_t gpa;
4591         u32 i, j;
4592
4593         vcpu->arch.pat = vmcs_read64(GUEST_IA32_PAT);
4594
4595         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_DEBUG_CONTROLS) {
4596                 /*
4597                  * L1's host DR7 is lost if KVM_GUESTDBG_USE_HW_BP is set
4598                  * as vmcs01.GUEST_DR7 contains a userspace defined value
4599                  * and vcpu->arch.dr7 is not squirreled away before the
4600                  * nested VMENTER (not worth adding a variable in nested_vmx).
4601                  */
4602                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
4603                         kvm_set_dr(vcpu, 7, DR7_FIXED_1);
4604                 else
4605                         WARN_ON(kvm_set_dr(vcpu, 7, vmcs_readl(GUEST_DR7)));
4606         }
4607
4608         /*
4609          * Note that calling vmx_set_{efer,cr0,cr4} is important as they
4610          * handle a variety of side effects to KVM's software model.
4611          */
4612         vmx_set_efer(vcpu, nested_vmx_get_vmcs01_guest_efer(vmx));
4613
4614         vcpu->arch.cr0_guest_owned_bits = vmx_l1_guest_owned_cr0_bits();
4615         vmx_set_cr0(vcpu, vmcs_readl(CR0_READ_SHADOW));
4616
4617         vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK);
4618         vmx_set_cr4(vcpu, vmcs_readl(CR4_READ_SHADOW));
4619
4620         nested_ept_uninit_mmu_context(vcpu);
4621         vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
4622         kvm_register_mark_available(vcpu, VCPU_EXREG_CR3);
4623
4624         /*
4625          * Use ept_save_pdptrs(vcpu) to load the MMU's cached PDPTRs
4626          * from vmcs01 (if necessary).  The PDPTRs are not loaded on
4627          * VMFail, like everything else we just need to ensure our
4628          * software model is up-to-date.
4629          */
4630         if (enable_ept && is_pae_paging(vcpu))
4631                 ept_save_pdptrs(vcpu);
4632
4633         kvm_mmu_reset_context(vcpu);
4634
4635         /*
4636          * This nasty bit of open coding is a compromise between blindly
4637          * loading L1's MSRs using the exit load lists (incorrect emulation
4638          * of VMFail), leaving the nested VM's MSRs in the software model
4639          * (incorrect behavior) and snapshotting the modified MSRs (too
4640          * expensive since the lists are unbound by hardware).  For each
4641          * MSR that was (prematurely) loaded from the nested VMEntry load
4642          * list, reload it from the exit load list if it exists and differs
4643          * from the guest value.  The intent is to stuff host state as
4644          * silently as possible, not to fully process the exit load list.
4645          */
4646         for (i = 0; i < vmcs12->vm_entry_msr_load_count; i++) {
4647                 gpa = vmcs12->vm_entry_msr_load_addr + (i * sizeof(g));
4648                 if (kvm_vcpu_read_guest(vcpu, gpa, &g, sizeof(g))) {
4649                         pr_debug_ratelimited(
4650                                 "%s read MSR index failed (%u, 0x%08llx)\n",
4651                                 __func__, i, gpa);
4652                         goto vmabort;
4653                 }
4654
4655                 for (j = 0; j < vmcs12->vm_exit_msr_load_count; j++) {
4656                         gpa = vmcs12->vm_exit_msr_load_addr + (j * sizeof(h));
4657                         if (kvm_vcpu_read_guest(vcpu, gpa, &h, sizeof(h))) {
4658                                 pr_debug_ratelimited(
4659                                         "%s read MSR failed (%u, 0x%08llx)\n",
4660                                         __func__, j, gpa);
4661                                 goto vmabort;
4662                         }
4663                         if (h.index != g.index)
4664                                 continue;
4665                         if (h.value == g.value)
4666                                 break;
4667
4668                         if (nested_vmx_load_msr_check(vcpu, &h)) {
4669                                 pr_debug_ratelimited(
4670                                         "%s check failed (%u, 0x%x, 0x%x)\n",
4671                                         __func__, j, h.index, h.reserved);
4672                                 goto vmabort;
4673                         }
4674
4675                         if (kvm_set_msr(vcpu, h.index, h.value)) {
4676                                 pr_debug_ratelimited(
4677                                         "%s WRMSR failed (%u, 0x%x, 0x%llx)\n",
4678                                         __func__, j, h.index, h.value);
4679                                 goto vmabort;
4680                         }
4681                 }
4682         }
4683
4684         return;
4685
4686 vmabort:
4687         nested_vmx_abort(vcpu, VMX_ABORT_LOAD_HOST_MSR_FAIL);
4688 }
4689
4690 /*
4691  * Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1
4692  * and modify vmcs12 to make it see what it would expect to see there if
4693  * L2 was its real guest. Must only be called when in L2 (is_guest_mode())
4694  */
4695 void nested_vmx_vmexit(struct kvm_vcpu *vcpu, u32 vm_exit_reason,
4696                        u32 exit_intr_info, unsigned long exit_qualification)
4697 {
4698         struct vcpu_vmx *vmx = to_vmx(vcpu);
4699         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
4700
4701         /* Pending MTF traps are discarded on VM-Exit. */
4702         vmx->nested.mtf_pending = false;
4703
4704         /* trying to cancel vmlaunch/vmresume is a bug */
4705         WARN_ON_ONCE(vmx->nested.nested_run_pending);
4706
4707         if (kvm_check_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu)) {
4708                 /*
4709                  * KVM_REQ_GET_NESTED_STATE_PAGES is also used to map
4710                  * Enlightened VMCS after migration and we still need to
4711                  * do that when something is forcing L2->L1 exit prior to
4712                  * the first L2 run.
4713                  */
4714                 (void)nested_get_evmcs_page(vcpu);
4715         }
4716
4717         /* Service pending TLB flush requests for L2 before switching to L1. */
4718         kvm_service_local_tlb_flush_requests(vcpu);
4719
4720         /*
4721          * VCPU_EXREG_PDPTR will be clobbered in arch/x86/kvm/vmx/vmx.h between
4722          * now and the new vmentry.  Ensure that the VMCS02 PDPTR fields are
4723          * up-to-date before switching to L1.
4724          */
4725         if (enable_ept && is_pae_paging(vcpu))
4726                 vmx_ept_load_pdptrs(vcpu);
4727
4728         leave_guest_mode(vcpu);
4729
4730         if (nested_cpu_has_preemption_timer(vmcs12))
4731                 hrtimer_cancel(&to_vmx(vcpu)->nested.preemption_timer);
4732
4733         if (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETTING)) {
4734                 vcpu->arch.tsc_offset = vcpu->arch.l1_tsc_offset;
4735                 if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_TSC_SCALING))
4736                         vcpu->arch.tsc_scaling_ratio = vcpu->arch.l1_tsc_scaling_ratio;
4737         }
4738
4739         if (likely(!vmx->fail)) {
4740                 sync_vmcs02_to_vmcs12(vcpu, vmcs12);
4741
4742                 if (vm_exit_reason != -1)
4743                         prepare_vmcs12(vcpu, vmcs12, vm_exit_reason,
4744                                        exit_intr_info, exit_qualification);
4745
4746                 /*
4747                  * Must happen outside of sync_vmcs02_to_vmcs12() as it will
4748                  * also be used to capture vmcs12 cache as part of
4749                  * capturing nVMX state for snapshot (migration).
4750                  *
4751                  * Otherwise, this flush will dirty guest memory at a
4752                  * point it is already assumed by user-space to be
4753                  * immutable.
4754                  */
4755                 nested_flush_cached_shadow_vmcs12(vcpu, vmcs12);
4756         } else {
4757                 /*
4758                  * The only expected VM-instruction error is "VM entry with
4759                  * invalid control field(s)." Anything else indicates a
4760                  * problem with L0.  And we should never get here with a
4761                  * VMFail of any type if early consistency checks are enabled.
4762                  */
4763                 WARN_ON_ONCE(vmcs_read32(VM_INSTRUCTION_ERROR) !=
4764                              VMXERR_ENTRY_INVALID_CONTROL_FIELD);
4765                 WARN_ON_ONCE(nested_early_check);
4766         }
4767
4768         /*
4769          * Drop events/exceptions that were queued for re-injection to L2
4770          * (picked up via vmx_complete_interrupts()), as well as exceptions
4771          * that were pending for L2.  Note, this must NOT be hoisted above
4772          * prepare_vmcs12(), events/exceptions queued for re-injection need to
4773          * be captured in vmcs12 (see vmcs12_save_pending_event()).
4774          */
4775         vcpu->arch.nmi_injected = false;
4776         kvm_clear_exception_queue(vcpu);
4777         kvm_clear_interrupt_queue(vcpu);
4778
4779         vmx_switch_vmcs(vcpu, &vmx->vmcs01);
4780
4781         /*
4782          * If IBRS is advertised to the vCPU, KVM must flush the indirect
4783          * branch predictors when transitioning from L2 to L1, as L1 expects
4784          * hardware (KVM in this case) to provide separate predictor modes.
4785          * Bare metal isolates VMX root (host) from VMX non-root (guest), but
4786          * doesn't isolate different VMCSs, i.e. in this case, doesn't provide
4787          * separate modes for L2 vs L1.
4788          */
4789         if (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL))
4790                 indirect_branch_prediction_barrier();
4791
4792         /* Update any VMCS fields that might have changed while L2 ran */
4793         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, vmx->msr_autoload.host.nr);
4794         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, vmx->msr_autoload.guest.nr);
4795         vmcs_write64(TSC_OFFSET, vcpu->arch.tsc_offset);
4796         if (kvm_caps.has_tsc_control)
4797                 vmcs_write64(TSC_MULTIPLIER, vcpu->arch.tsc_scaling_ratio);
4798
4799         if (vmx->nested.l1_tpr_threshold != -1)
4800                 vmcs_write32(TPR_THRESHOLD, vmx->nested.l1_tpr_threshold);
4801
4802         if (vmx->nested.change_vmcs01_virtual_apic_mode) {
4803                 vmx->nested.change_vmcs01_virtual_apic_mode = false;
4804                 vmx_set_virtual_apic_mode(vcpu);
4805         }
4806
4807         if (vmx->nested.update_vmcs01_cpu_dirty_logging) {
4808                 vmx->nested.update_vmcs01_cpu_dirty_logging = false;
4809                 vmx_update_cpu_dirty_logging(vcpu);
4810         }
4811
4812         /* Unpin physical memory we referred to in vmcs02 */
4813         kvm_vcpu_unmap(vcpu, &vmx->nested.apic_access_page_map, false);
4814         kvm_vcpu_unmap(vcpu, &vmx->nested.virtual_apic_map, true);
4815         kvm_vcpu_unmap(vcpu, &vmx->nested.pi_desc_map, true);
4816         vmx->nested.pi_desc = NULL;
4817
4818         if (vmx->nested.reload_vmcs01_apic_access_page) {
4819                 vmx->nested.reload_vmcs01_apic_access_page = false;
4820                 kvm_make_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu);
4821         }
4822
4823         if (vmx->nested.update_vmcs01_apicv_status) {
4824                 vmx->nested.update_vmcs01_apicv_status = false;
4825                 kvm_make_request(KVM_REQ_APICV_UPDATE, vcpu);
4826         }
4827
4828         if ((vm_exit_reason != -1) &&
4829             (enable_shadow_vmcs || evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)))
4830                 vmx->nested.need_vmcs12_to_shadow_sync = true;
4831
4832         /* in case we halted in L2 */
4833         vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4834
4835         if (likely(!vmx->fail)) {
4836                 if ((u16)vm_exit_reason == EXIT_REASON_EXTERNAL_INTERRUPT &&
4837                     nested_exit_intr_ack_set(vcpu)) {
4838                         int irq = kvm_cpu_get_interrupt(vcpu);
4839                         WARN_ON(irq < 0);
4840                         vmcs12->vm_exit_intr_info = irq |
4841                                 INTR_INFO_VALID_MASK | INTR_TYPE_EXT_INTR;
4842                 }
4843
4844                 if (vm_exit_reason != -1)
4845                         trace_kvm_nested_vmexit_inject(vmcs12->vm_exit_reason,
4846                                                        vmcs12->exit_qualification,
4847                                                        vmcs12->idt_vectoring_info_field,
4848                                                        vmcs12->vm_exit_intr_info,
4849                                                        vmcs12->vm_exit_intr_error_code,
4850                                                        KVM_ISA_VMX);
4851
4852                 load_vmcs12_host_state(vcpu, vmcs12);
4853
4854                 return;
4855         }
4856
4857         /*
4858          * After an early L2 VM-entry failure, we're now back
4859          * in L1 which thinks it just finished a VMLAUNCH or
4860          * VMRESUME instruction, so we need to set the failure
4861          * flag and the VM-instruction error field of the VMCS
4862          * accordingly, and skip the emulated instruction.
4863          */
4864         (void)nested_vmx_fail(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
4865
4866         /*
4867          * Restore L1's host state to KVM's software model.  We're here
4868          * because a consistency check was caught by hardware, which
4869          * means some amount of guest state has been propagated to KVM's
4870          * model and needs to be unwound to the host's state.
4871          */
4872         nested_vmx_restore_host_state(vcpu);
4873
4874         vmx->fail = 0;
4875 }
4876
4877 static void nested_vmx_triple_fault(struct kvm_vcpu *vcpu)
4878 {
4879         kvm_clear_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4880         nested_vmx_vmexit(vcpu, EXIT_REASON_TRIPLE_FAULT, 0, 0);
4881 }
4882
4883 /*
4884  * Decode the memory-address operand of a vmx instruction, as recorded on an
4885  * exit caused by such an instruction (run by a guest hypervisor).
4886  * On success, returns 0. When the operand is invalid, returns 1 and throws
4887  * #UD, #GP, or #SS.
4888  */
4889 int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
4890                         u32 vmx_instruction_info, bool wr, int len, gva_t *ret)
4891 {
4892         gva_t off;
4893         bool exn;
4894         struct kvm_segment s;
4895
4896         /*
4897          * According to Vol. 3B, "Information for VM Exits Due to Instruction
4898          * Execution", on an exit, vmx_instruction_info holds most of the
4899          * addressing components of the operand. Only the displacement part
4900          * is put in exit_qualification (see 3B, "Basic VM-Exit Information").
4901          * For how an actual address is calculated from all these components,
4902          * refer to Vol. 1, "Operand Addressing".
4903          */
4904         int  scaling = vmx_instruction_info & 3;
4905         int  addr_size = (vmx_instruction_info >> 7) & 7;
4906         bool is_reg = vmx_instruction_info & (1u << 10);
4907         int  seg_reg = (vmx_instruction_info >> 15) & 7;
4908         int  index_reg = (vmx_instruction_info >> 18) & 0xf;
4909         bool index_is_valid = !(vmx_instruction_info & (1u << 22));
4910         int  base_reg       = (vmx_instruction_info >> 23) & 0xf;
4911         bool base_is_valid  = !(vmx_instruction_info & (1u << 27));
4912
4913         if (is_reg) {
4914                 kvm_queue_exception(vcpu, UD_VECTOR);
4915                 return 1;
4916         }
4917
4918         /* Addr = segment_base + offset */
4919         /* offset = base + [index * scale] + displacement */
4920         off = exit_qualification; /* holds the displacement */
4921         if (addr_size == 1)
4922                 off = (gva_t)sign_extend64(off, 31);
4923         else if (addr_size == 0)
4924                 off = (gva_t)sign_extend64(off, 15);
4925         if (base_is_valid)
4926                 off += kvm_register_read(vcpu, base_reg);
4927         if (index_is_valid)
4928                 off += kvm_register_read(vcpu, index_reg) << scaling;
4929         vmx_get_segment(vcpu, &s, seg_reg);
4930
4931         /*
4932          * The effective address, i.e. @off, of a memory operand is truncated
4933          * based on the address size of the instruction.  Note that this is
4934          * the *effective address*, i.e. the address prior to accounting for
4935          * the segment's base.
4936          */
4937         if (addr_size == 1) /* 32 bit */
4938                 off &= 0xffffffff;
4939         else if (addr_size == 0) /* 16 bit */
4940                 off &= 0xffff;
4941
4942         /* Checks for #GP/#SS exceptions. */
4943         exn = false;
4944         if (is_long_mode(vcpu)) {
4945                 /*
4946                  * The virtual/linear address is never truncated in 64-bit
4947                  * mode, e.g. a 32-bit address size can yield a 64-bit virtual
4948                  * address when using FS/GS with a non-zero base.
4949                  */
4950                 if (seg_reg == VCPU_SREG_FS || seg_reg == VCPU_SREG_GS)
4951                         *ret = s.base + off;
4952                 else
4953                         *ret = off;
4954
4955                 /* Long mode: #GP(0)/#SS(0) if the memory address is in a
4956                  * non-canonical form. This is the only check on the memory
4957                  * destination for long mode!
4958                  */
4959                 exn = is_noncanonical_address(*ret, vcpu);
4960         } else {
4961                 /*
4962                  * When not in long mode, the virtual/linear address is
4963                  * unconditionally truncated to 32 bits regardless of the
4964                  * address size.
4965                  */
4966                 *ret = (s.base + off) & 0xffffffff;
4967
4968                 /* Protected mode: apply checks for segment validity in the
4969                  * following order:
4970                  * - segment type check (#GP(0) may be thrown)
4971                  * - usability check (#GP(0)/#SS(0))
4972                  * - limit check (#GP(0)/#SS(0))
4973                  */
4974                 if (wr)
4975                         /* #GP(0) if the destination operand is located in a
4976                          * read-only data segment or any code segment.
4977                          */
4978                         exn = ((s.type & 0xa) == 0 || (s.type & 8));
4979                 else
4980                         /* #GP(0) if the source operand is located in an
4981                          * execute-only code segment
4982                          */
4983                         exn = ((s.type & 0xa) == 8);
4984                 if (exn) {
4985                         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
4986                         return 1;
4987                 }
4988                 /* Protected mode: #GP(0)/#SS(0) if the segment is unusable.
4989                  */
4990                 exn = (s.unusable != 0);
4991
4992                 /*
4993                  * Protected mode: #GP(0)/#SS(0) if the memory operand is
4994                  * outside the segment limit.  All CPUs that support VMX ignore
4995                  * limit checks for flat segments, i.e. segments with base==0,
4996                  * limit==0xffffffff and of type expand-up data or code.
4997                  */
4998                 if (!(s.base == 0 && s.limit == 0xffffffff &&
4999                      ((s.type & 8) || !(s.type & 4))))
5000                         exn = exn || ((u64)off + len - 1 > s.limit);
5001         }
5002         if (exn) {
5003                 kvm_queue_exception_e(vcpu,
5004                                       seg_reg == VCPU_SREG_SS ?
5005                                                 SS_VECTOR : GP_VECTOR,
5006                                       0);
5007                 return 1;
5008         }
5009
5010         return 0;
5011 }
5012
5013 static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer,
5014                                 int *ret)
5015 {
5016         gva_t gva;
5017         struct x86_exception e;
5018         int r;
5019
5020         if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu),
5021                                 vmcs_read32(VMX_INSTRUCTION_INFO), false,
5022                                 sizeof(*vmpointer), &gva)) {
5023                 *ret = 1;
5024                 return -EINVAL;
5025         }
5026
5027         r = kvm_read_guest_virt(vcpu, gva, vmpointer, sizeof(*vmpointer), &e);
5028         if (r != X86EMUL_CONTINUE) {
5029                 *ret = kvm_handle_memory_failure(vcpu, r, &e);
5030                 return -EINVAL;
5031         }
5032
5033         return 0;
5034 }
5035
5036 /*
5037  * Allocate a shadow VMCS and associate it with the currently loaded
5038  * VMCS, unless such a shadow VMCS already exists. The newly allocated
5039  * VMCS is also VMCLEARed, so that it is ready for use.
5040  */
5041 static struct vmcs *alloc_shadow_vmcs(struct kvm_vcpu *vcpu)
5042 {
5043         struct vcpu_vmx *vmx = to_vmx(vcpu);
5044         struct loaded_vmcs *loaded_vmcs = vmx->loaded_vmcs;
5045
5046         /*
5047          * KVM allocates a shadow VMCS only when L1 executes VMXON and frees it
5048          * when L1 executes VMXOFF or the vCPU is forced out of nested
5049          * operation.  VMXON faults if the CPU is already post-VMXON, so it
5050          * should be impossible to already have an allocated shadow VMCS.  KVM
5051          * doesn't support virtualization of VMCS shadowing, so vmcs01 should
5052          * always be the loaded VMCS.
5053          */
5054         if (WARN_ON(loaded_vmcs != &vmx->vmcs01 || loaded_vmcs->shadow_vmcs))
5055                 return loaded_vmcs->shadow_vmcs;
5056
5057         loaded_vmcs->shadow_vmcs = alloc_vmcs(true);
5058         if (loaded_vmcs->shadow_vmcs)
5059                 vmcs_clear(loaded_vmcs->shadow_vmcs);
5060
5061         return loaded_vmcs->shadow_vmcs;
5062 }
5063
5064 static int enter_vmx_operation(struct kvm_vcpu *vcpu)
5065 {
5066         struct vcpu_vmx *vmx = to_vmx(vcpu);
5067         int r;
5068
5069         r = alloc_loaded_vmcs(&vmx->nested.vmcs02);
5070         if (r < 0)
5071                 goto out_vmcs02;
5072
5073         vmx->nested.cached_vmcs12 = kzalloc(VMCS12_SIZE, GFP_KERNEL_ACCOUNT);
5074         if (!vmx->nested.cached_vmcs12)
5075                 goto out_cached_vmcs12;
5076
5077         vmx->nested.shadow_vmcs12_cache.gpa = INVALID_GPA;
5078         vmx->nested.cached_shadow_vmcs12 = kzalloc(VMCS12_SIZE, GFP_KERNEL_ACCOUNT);
5079         if (!vmx->nested.cached_shadow_vmcs12)
5080                 goto out_cached_shadow_vmcs12;
5081
5082         if (enable_shadow_vmcs && !alloc_shadow_vmcs(vcpu))
5083                 goto out_shadow_vmcs;
5084
5085         hrtimer_init(&vmx->nested.preemption_timer, CLOCK_MONOTONIC,
5086                      HRTIMER_MODE_ABS_PINNED);
5087         vmx->nested.preemption_timer.function = vmx_preemption_timer_fn;
5088
5089         vmx->nested.vpid02 = allocate_vpid();
5090
5091         vmx->nested.vmcs02_initialized = false;
5092         vmx->nested.vmxon = true;
5093
5094         if (vmx_pt_mode_is_host_guest()) {
5095                 vmx->pt_desc.guest.ctl = 0;
5096                 pt_update_intercept_for_msr(vcpu);
5097         }
5098
5099         return 0;
5100
5101 out_shadow_vmcs:
5102         kfree(vmx->nested.cached_shadow_vmcs12);
5103
5104 out_cached_shadow_vmcs12:
5105         kfree(vmx->nested.cached_vmcs12);
5106
5107 out_cached_vmcs12:
5108         free_loaded_vmcs(&vmx->nested.vmcs02);
5109
5110 out_vmcs02:
5111         return -ENOMEM;
5112 }
5113
5114 /* Emulate the VMXON instruction. */
5115 static int handle_vmxon(struct kvm_vcpu *vcpu)
5116 {
5117         int ret;
5118         gpa_t vmptr;
5119         uint32_t revision;
5120         struct vcpu_vmx *vmx = to_vmx(vcpu);
5121         const u64 VMXON_NEEDED_FEATURES = FEAT_CTL_LOCKED
5122                 | FEAT_CTL_VMX_ENABLED_OUTSIDE_SMX;
5123
5124         /*
5125          * Manually check CR4.VMXE checks, KVM must force CR4.VMXE=1 to enter
5126          * the guest and so cannot rely on hardware to perform the check,
5127          * which has higher priority than VM-Exit (see Intel SDM's pseudocode
5128          * for VMXON).
5129          *
5130          * Rely on hardware for the other pre-VM-Exit checks, CR0.PE=1, !VM86
5131          * and !COMPATIBILITY modes.  For an unrestricted guest, KVM doesn't
5132          * force any of the relevant guest state.  For a restricted guest, KVM
5133          * does force CR0.PE=1, but only to also force VM86 in order to emulate
5134          * Real Mode, and so there's no need to check CR0.PE manually.
5135          */
5136         if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE)) {
5137                 kvm_queue_exception(vcpu, UD_VECTOR);
5138                 return 1;
5139         }
5140
5141         /*
5142          * The CPL is checked for "not in VMX operation" and for "in VMX root",
5143          * and has higher priority than the VM-Fail due to being post-VMXON,
5144          * i.e. VMXON #GPs outside of VMX non-root if CPL!=0.  In VMX non-root,
5145          * VMXON causes VM-Exit and KVM unconditionally forwards VMXON VM-Exits
5146          * from L2 to L1, i.e. there's no need to check for the vCPU being in
5147          * VMX non-root.
5148          *
5149          * Forwarding the VM-Exit unconditionally, i.e. without performing the
5150          * #UD checks (see above), is functionally ok because KVM doesn't allow
5151          * L1 to run L2 without CR4.VMXE=0, and because KVM never modifies L2's
5152          * CR0 or CR4, i.e. it's L2's responsibility to emulate #UDs that are
5153          * missed by hardware due to shadowing CR0 and/or CR4.
5154          */
5155         if (vmx_get_cpl(vcpu)) {
5156                 kvm_inject_gp(vcpu, 0);
5157                 return 1;
5158         }
5159
5160         if (vmx->nested.vmxon)
5161                 return nested_vmx_fail(vcpu, VMXERR_VMXON_IN_VMX_ROOT_OPERATION);
5162
5163         /*
5164          * Invalid CR0/CR4 generates #GP.  These checks are performed if and
5165          * only if the vCPU isn't already in VMX operation, i.e. effectively
5166          * have lower priority than the VM-Fail above.
5167          */
5168         if (!nested_host_cr0_valid(vcpu, kvm_read_cr0(vcpu)) ||
5169             !nested_host_cr4_valid(vcpu, kvm_read_cr4(vcpu))) {
5170                 kvm_inject_gp(vcpu, 0);
5171                 return 1;
5172         }
5173
5174         if ((vmx->msr_ia32_feature_control & VMXON_NEEDED_FEATURES)
5175                         != VMXON_NEEDED_FEATURES) {
5176                 kvm_inject_gp(vcpu, 0);
5177                 return 1;
5178         }
5179
5180         if (nested_vmx_get_vmptr(vcpu, &vmptr, &ret))
5181                 return ret;
5182
5183         /*
5184          * SDM 3: 24.11.5
5185          * The first 4 bytes of VMXON region contain the supported
5186          * VMCS revision identifier
5187          *
5188          * Note - IA32_VMX_BASIC[48] will never be 1 for the nested case;
5189          * which replaces physical address width with 32
5190          */
5191         if (!page_address_valid(vcpu, vmptr))
5192                 return nested_vmx_failInvalid(vcpu);
5193
5194         if (kvm_read_guest(vcpu->kvm, vmptr, &revision, sizeof(revision)) ||
5195             revision != VMCS12_REVISION)
5196                 return nested_vmx_failInvalid(vcpu);
5197
5198         vmx->nested.vmxon_ptr = vmptr;
5199         ret = enter_vmx_operation(vcpu);
5200         if (ret)
5201                 return ret;
5202
5203         return nested_vmx_succeed(vcpu);
5204 }
5205
5206 static inline void nested_release_vmcs12(struct kvm_vcpu *vcpu)
5207 {
5208         struct vcpu_vmx *vmx = to_vmx(vcpu);
5209
5210         if (vmx->nested.current_vmptr == INVALID_GPA)
5211                 return;
5212
5213         copy_vmcs02_to_vmcs12_rare(vcpu, get_vmcs12(vcpu));
5214
5215         if (enable_shadow_vmcs) {
5216                 /* copy to memory all shadowed fields in case
5217                    they were modified */
5218                 copy_shadow_to_vmcs12(vmx);
5219                 vmx_disable_shadow_vmcs(vmx);
5220         }
5221         vmx->nested.posted_intr_nv = -1;
5222
5223         /* Flush VMCS12 to guest memory */
5224         kvm_vcpu_write_guest_page(vcpu,
5225                                   vmx->nested.current_vmptr >> PAGE_SHIFT,
5226                                   vmx->nested.cached_vmcs12, 0, VMCS12_SIZE);
5227
5228         kvm_mmu_free_roots(vcpu->kvm, &vcpu->arch.guest_mmu, KVM_MMU_ROOTS_ALL);
5229
5230         vmx->nested.current_vmptr = INVALID_GPA;
5231 }
5232
5233 /* Emulate the VMXOFF instruction */
5234 static int handle_vmxoff(struct kvm_vcpu *vcpu)
5235 {
5236         if (!nested_vmx_check_permission(vcpu))
5237                 return 1;
5238
5239         free_nested(vcpu);
5240
5241         if (kvm_apic_has_pending_init_or_sipi(vcpu))
5242                 kvm_make_request(KVM_REQ_EVENT, vcpu);
5243
5244         return nested_vmx_succeed(vcpu);
5245 }
5246
5247 /* Emulate the VMCLEAR instruction */
5248 static int handle_vmclear(struct kvm_vcpu *vcpu)
5249 {
5250         struct vcpu_vmx *vmx = to_vmx(vcpu);
5251         u32 zero = 0;
5252         gpa_t vmptr;
5253         u64 evmcs_gpa;
5254         int r;
5255
5256         if (!nested_vmx_check_permission(vcpu))
5257                 return 1;
5258
5259         if (nested_vmx_get_vmptr(vcpu, &vmptr, &r))
5260                 return r;
5261
5262         if (!page_address_valid(vcpu, vmptr))
5263                 return nested_vmx_fail(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);
5264
5265         if (vmptr == vmx->nested.vmxon_ptr)
5266                 return nested_vmx_fail(vcpu, VMXERR_VMCLEAR_VMXON_POINTER);
5267
5268         /*
5269          * When Enlightened VMEntry is enabled on the calling CPU we treat
5270          * memory area pointer by vmptr as Enlightened VMCS (as there's no good
5271          * way to distinguish it from VMCS12) and we must not corrupt it by
5272          * writing to the non-existent 'launch_state' field. The area doesn't
5273          * have to be the currently active EVMCS on the calling CPU and there's
5274          * nothing KVM has to do to transition it from 'active' to 'non-active'
5275          * state. It is possible that the area will stay mapped as
5276          * vmx->nested.hv_evmcs but this shouldn't be a problem.
5277          */
5278         if (likely(!guest_cpuid_has_evmcs(vcpu) ||
5279                    !nested_enlightened_vmentry(vcpu, &evmcs_gpa))) {
5280                 if (vmptr == vmx->nested.current_vmptr)
5281                         nested_release_vmcs12(vcpu);
5282
5283                 kvm_vcpu_write_guest(vcpu,
5284                                      vmptr + offsetof(struct vmcs12,
5285                                                       launch_state),
5286                                      &zero, sizeof(zero));
5287         } else if (vmx->nested.hv_evmcs && vmptr == vmx->nested.hv_evmcs_vmptr) {
5288                 nested_release_evmcs(vcpu);
5289         }
5290
5291         return nested_vmx_succeed(vcpu);
5292 }
5293
5294 /* Emulate the VMLAUNCH instruction */
5295 static int handle_vmlaunch(struct kvm_vcpu *vcpu)
5296 {
5297         return nested_vmx_run(vcpu, true);
5298 }
5299
5300 /* Emulate the VMRESUME instruction */
5301 static int handle_vmresume(struct kvm_vcpu *vcpu)
5302 {
5303
5304         return nested_vmx_run(vcpu, false);
5305 }
5306
5307 static int handle_vmread(struct kvm_vcpu *vcpu)
5308 {
5309         struct vmcs12 *vmcs12 = is_guest_mode(vcpu) ? get_shadow_vmcs12(vcpu)
5310                                                     : get_vmcs12(vcpu);
5311         unsigned long exit_qualification = vmx_get_exit_qual(vcpu);
5312         u32 instr_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5313         struct vcpu_vmx *vmx = to_vmx(vcpu);
5314         struct x86_exception e;
5315         unsigned long field;
5316         u64 value;
5317         gva_t gva = 0;
5318         short offset;
5319         int len, r;
5320
5321         if (!nested_vmx_check_permission(vcpu))
5322                 return 1;
5323
5324         /* Decode instruction info and find the field to read */
5325         field = kvm_register_read(vcpu, (((instr_info) >> 28) & 0xf));
5326
5327         if (!evmptr_is_valid(vmx->nested.hv_evmcs_vmptr)) {
5328                 /*
5329                  * In VMX non-root operation, when the VMCS-link pointer is INVALID_GPA,
5330                  * any VMREAD sets the ALU flags for VMfailInvalid.
5331                  */
5332                 if (vmx->nested.current_vmptr == INVALID_GPA ||
5333                     (is_guest_mode(vcpu) &&
5334                      get_vmcs12(vcpu)->vmcs_link_pointer == INVALID_GPA))
5335                         return nested_vmx_failInvalid(vcpu);
5336
5337                 offset = get_vmcs12_field_offset(field);
5338                 if (offset < 0)
5339                         return nested_vmx_fail(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5340
5341                 if (!is_guest_mode(vcpu) && is_vmcs12_ext_field(field))
5342                         copy_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
5343
5344                 /* Read the field, zero-extended to a u64 value */
5345                 value = vmcs12_read_any(vmcs12, field, offset);
5346         } else {
5347                 /*
5348                  * Hyper-V TLFS (as of 6.0b) explicitly states, that while an
5349                  * enlightened VMCS is active VMREAD/VMWRITE instructions are
5350                  * unsupported. Unfortunately, certain versions of Windows 11
5351                  * don't comply with this requirement which is not enforced in
5352                  * genuine Hyper-V. Allow VMREAD from an enlightened VMCS as a
5353                  * workaround, as misbehaving guests will panic on VM-Fail.
5354                  * Note, enlightened VMCS is incompatible with shadow VMCS so
5355                  * all VMREADs from L2 should go to L1.
5356                  */
5357                 if (WARN_ON_ONCE(is_guest_mode(vcpu)))
5358                         return nested_vmx_failInvalid(vcpu);
5359
5360                 offset = evmcs_field_offset(field, NULL);
5361                 if (offset < 0)
5362                         return nested_vmx_fail(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5363
5364                 /* Read the field, zero-extended to a u64 value */
5365                 value = evmcs_read_any(vmx->nested.hv_evmcs, field, offset);
5366         }
5367
5368         /*
5369          * Now copy part of this value to register or memory, as requested.
5370          * Note that the number of bits actually copied is 32 or 64 depending
5371          * on the guest's mode (32 or 64 bit), not on the given field's length.
5372          */
5373         if (instr_info & BIT(10)) {
5374                 kvm_register_write(vcpu, (((instr_info) >> 3) & 0xf), value);
5375         } else {
5376                 len = is_64_bit_mode(vcpu) ? 8 : 4;
5377                 if (get_vmx_mem_address(vcpu, exit_qualification,
5378                                         instr_info, true, len, &gva))
5379                         return 1;
5380                 /* _system ok, nested_vmx_check_permission has verified cpl=0 */
5381                 r = kvm_write_guest_virt_system(vcpu, gva, &value, len, &e);
5382                 if (r != X86EMUL_CONTINUE)
5383                         return kvm_handle_memory_failure(vcpu, r, &e);
5384         }
5385
5386         return nested_vmx_succeed(vcpu);
5387 }
5388
5389 static bool is_shadow_field_rw(unsigned long field)
5390 {
5391         switch (field) {
5392 #define SHADOW_FIELD_RW(x, y) case x:
5393 #include "vmcs_shadow_fields.h"
5394                 return true;
5395         default:
5396                 break;
5397         }
5398         return false;
5399 }
5400
5401 static bool is_shadow_field_ro(unsigned long field)
5402 {
5403         switch (field) {
5404 #define SHADOW_FIELD_RO(x, y) case x:
5405 #include "vmcs_shadow_fields.h"
5406                 return true;
5407         default:
5408                 break;
5409         }
5410         return false;
5411 }
5412
5413 static int handle_vmwrite(struct kvm_vcpu *vcpu)
5414 {
5415         struct vmcs12 *vmcs12 = is_guest_mode(vcpu) ? get_shadow_vmcs12(vcpu)
5416                                                     : get_vmcs12(vcpu);
5417         unsigned long exit_qualification = vmx_get_exit_qual(vcpu);
5418         u32 instr_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5419         struct vcpu_vmx *vmx = to_vmx(vcpu);
5420         struct x86_exception e;
5421         unsigned long field;
5422         short offset;
5423         gva_t gva;
5424         int len, r;
5425
5426         /*
5427          * The value to write might be 32 or 64 bits, depending on L1's long
5428          * mode, and eventually we need to write that into a field of several
5429          * possible lengths. The code below first zero-extends the value to 64
5430          * bit (value), and then copies only the appropriate number of
5431          * bits into the vmcs12 field.
5432          */
5433         u64 value = 0;
5434
5435         if (!nested_vmx_check_permission(vcpu))
5436                 return 1;
5437
5438         /*
5439          * In VMX non-root operation, when the VMCS-link pointer is INVALID_GPA,
5440          * any VMWRITE sets the ALU flags for VMfailInvalid.
5441          */
5442         if (vmx->nested.current_vmptr == INVALID_GPA ||
5443             (is_guest_mode(vcpu) &&
5444              get_vmcs12(vcpu)->vmcs_link_pointer == INVALID_GPA))
5445                 return nested_vmx_failInvalid(vcpu);
5446
5447         if (instr_info & BIT(10))
5448                 value = kvm_register_read(vcpu, (((instr_info) >> 3) & 0xf));
5449         else {
5450                 len = is_64_bit_mode(vcpu) ? 8 : 4;
5451                 if (get_vmx_mem_address(vcpu, exit_qualification,
5452                                         instr_info, false, len, &gva))
5453                         return 1;
5454                 r = kvm_read_guest_virt(vcpu, gva, &value, len, &e);
5455                 if (r != X86EMUL_CONTINUE)
5456                         return kvm_handle_memory_failure(vcpu, r, &e);
5457         }
5458
5459         field = kvm_register_read(vcpu, (((instr_info) >> 28) & 0xf));
5460
5461         offset = get_vmcs12_field_offset(field);
5462         if (offset < 0)
5463                 return nested_vmx_fail(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5464
5465         /*
5466          * If the vCPU supports "VMWRITE to any supported field in the
5467          * VMCS," then the "read-only" fields are actually read/write.
5468          */
5469         if (vmcs_field_readonly(field) &&
5470             !nested_cpu_has_vmwrite_any_field(vcpu))
5471                 return nested_vmx_fail(vcpu, VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
5472
5473         /*
5474          * Ensure vmcs12 is up-to-date before any VMWRITE that dirties
5475          * vmcs12, else we may crush a field or consume a stale value.
5476          */
5477         if (!is_guest_mode(vcpu) && !is_shadow_field_rw(field))
5478                 copy_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
5479
5480         /*
5481          * Some Intel CPUs intentionally drop the reserved bits of the AR byte
5482          * fields on VMWRITE.  Emulate this behavior to ensure consistent KVM
5483          * behavior regardless of the underlying hardware, e.g. if an AR_BYTE
5484          * field is intercepted for VMWRITE but not VMREAD (in L1), then VMREAD
5485          * from L1 will return a different value than VMREAD from L2 (L1 sees
5486          * the stripped down value, L2 sees the full value as stored by KVM).
5487          */
5488         if (field >= GUEST_ES_AR_BYTES && field <= GUEST_TR_AR_BYTES)
5489                 value &= 0x1f0ff;
5490
5491         vmcs12_write_any(vmcs12, field, offset, value);
5492
5493         /*
5494          * Do not track vmcs12 dirty-state if in guest-mode as we actually
5495          * dirty shadow vmcs12 instead of vmcs12.  Fields that can be updated
5496          * by L1 without a vmexit are always updated in the vmcs02, i.e. don't
5497          * "dirty" vmcs12, all others go down the prepare_vmcs02() slow path.
5498          */
5499         if (!is_guest_mode(vcpu) && !is_shadow_field_rw(field)) {
5500                 /*
5501                  * L1 can read these fields without exiting, ensure the
5502                  * shadow VMCS is up-to-date.
5503                  */
5504                 if (enable_shadow_vmcs && is_shadow_field_ro(field)) {
5505                         preempt_disable();
5506                         vmcs_load(vmx->vmcs01.shadow_vmcs);
5507
5508                         __vmcs_writel(field, value);
5509
5510                         vmcs_clear(vmx->vmcs01.shadow_vmcs);
5511                         vmcs_load(vmx->loaded_vmcs->vmcs);
5512                         preempt_enable();
5513                 }
5514                 vmx->nested.dirty_vmcs12 = true;
5515         }
5516
5517         return nested_vmx_succeed(vcpu);
5518 }
5519
5520 static void set_current_vmptr(struct vcpu_vmx *vmx, gpa_t vmptr)
5521 {
5522         vmx->nested.current_vmptr = vmptr;
5523         if (enable_shadow_vmcs) {
5524                 secondary_exec_controls_setbit(vmx, SECONDARY_EXEC_SHADOW_VMCS);
5525                 vmcs_write64(VMCS_LINK_POINTER,
5526                              __pa(vmx->vmcs01.shadow_vmcs));
5527                 vmx->nested.need_vmcs12_to_shadow_sync = true;
5528         }
5529         vmx->nested.dirty_vmcs12 = true;
5530         vmx->nested.force_msr_bitmap_recalc = true;
5531 }
5532
5533 /* Emulate the VMPTRLD instruction */
5534 static int handle_vmptrld(struct kvm_vcpu *vcpu)
5535 {
5536         struct vcpu_vmx *vmx = to_vmx(vcpu);
5537         gpa_t vmptr;
5538         int r;
5539
5540         if (!nested_vmx_check_permission(vcpu))
5541                 return 1;
5542
5543         if (nested_vmx_get_vmptr(vcpu, &vmptr, &r))
5544                 return r;
5545
5546         if (!page_address_valid(vcpu, vmptr))
5547                 return nested_vmx_fail(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS);
5548
5549         if (vmptr == vmx->nested.vmxon_ptr)
5550                 return nested_vmx_fail(vcpu, VMXERR_VMPTRLD_VMXON_POINTER);
5551
5552         /* Forbid normal VMPTRLD if Enlightened version was used */
5553         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
5554                 return 1;
5555
5556         if (vmx->nested.current_vmptr != vmptr) {
5557                 struct gfn_to_hva_cache *ghc = &vmx->nested.vmcs12_cache;
5558                 struct vmcs_hdr hdr;
5559
5560                 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, ghc, vmptr, VMCS12_SIZE)) {
5561                         /*
5562                          * Reads from an unbacked page return all 1s,
5563                          * which means that the 32 bits located at the
5564                          * given physical address won't match the required
5565                          * VMCS12_REVISION identifier.
5566                          */
5567                         return nested_vmx_fail(vcpu,
5568                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
5569                 }
5570
5571                 if (kvm_read_guest_offset_cached(vcpu->kvm, ghc, &hdr,
5572                                                  offsetof(struct vmcs12, hdr),
5573                                                  sizeof(hdr))) {
5574                         return nested_vmx_fail(vcpu,
5575                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
5576                 }
5577
5578                 if (hdr.revision_id != VMCS12_REVISION ||
5579                     (hdr.shadow_vmcs &&
5580                      !nested_cpu_has_vmx_shadow_vmcs(vcpu))) {
5581                         return nested_vmx_fail(vcpu,
5582                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
5583                 }
5584
5585                 nested_release_vmcs12(vcpu);
5586
5587                 /*
5588                  * Load VMCS12 from guest memory since it is not already
5589                  * cached.
5590                  */
5591                 if (kvm_read_guest_cached(vcpu->kvm, ghc, vmx->nested.cached_vmcs12,
5592                                           VMCS12_SIZE)) {
5593                         return nested_vmx_fail(vcpu,
5594                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
5595                 }
5596
5597                 set_current_vmptr(vmx, vmptr);
5598         }
5599
5600         return nested_vmx_succeed(vcpu);
5601 }
5602
5603 /* Emulate the VMPTRST instruction */
5604 static int handle_vmptrst(struct kvm_vcpu *vcpu)
5605 {
5606         unsigned long exit_qual = vmx_get_exit_qual(vcpu);
5607         u32 instr_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5608         gpa_t current_vmptr = to_vmx(vcpu)->nested.current_vmptr;
5609         struct x86_exception e;
5610         gva_t gva;
5611         int r;
5612
5613         if (!nested_vmx_check_permission(vcpu))
5614                 return 1;
5615
5616         if (unlikely(evmptr_is_valid(to_vmx(vcpu)->nested.hv_evmcs_vmptr)))
5617                 return 1;
5618
5619         if (get_vmx_mem_address(vcpu, exit_qual, instr_info,
5620                                 true, sizeof(gpa_t), &gva))
5621                 return 1;
5622         /* *_system ok, nested_vmx_check_permission has verified cpl=0 */
5623         r = kvm_write_guest_virt_system(vcpu, gva, (void *)&current_vmptr,
5624                                         sizeof(gpa_t), &e);
5625         if (r != X86EMUL_CONTINUE)
5626                 return kvm_handle_memory_failure(vcpu, r, &e);
5627
5628         return nested_vmx_succeed(vcpu);
5629 }
5630
5631 /* Emulate the INVEPT instruction */
5632 static int handle_invept(struct kvm_vcpu *vcpu)
5633 {
5634         struct vcpu_vmx *vmx = to_vmx(vcpu);
5635         u32 vmx_instruction_info, types;
5636         unsigned long type, roots_to_free;
5637         struct kvm_mmu *mmu;
5638         gva_t gva;
5639         struct x86_exception e;
5640         struct {
5641                 u64 eptp, gpa;
5642         } operand;
5643         int i, r, gpr_index;
5644
5645         if (!(vmx->nested.msrs.secondary_ctls_high &
5646               SECONDARY_EXEC_ENABLE_EPT) ||
5647             !(vmx->nested.msrs.ept_caps & VMX_EPT_INVEPT_BIT)) {
5648                 kvm_queue_exception(vcpu, UD_VECTOR);
5649                 return 1;
5650         }
5651
5652         if (!nested_vmx_check_permission(vcpu))
5653                 return 1;
5654
5655         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5656         gpr_index = vmx_get_instr_info_reg2(vmx_instruction_info);
5657         type = kvm_register_read(vcpu, gpr_index);
5658
5659         types = (vmx->nested.msrs.ept_caps >> VMX_EPT_EXTENT_SHIFT) & 6;
5660
5661         if (type >= 32 || !(types & (1 << type)))
5662                 return nested_vmx_fail(vcpu, VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
5663
5664         /* According to the Intel VMX instruction reference, the memory
5665          * operand is read even if it isn't needed (e.g., for type==global)
5666          */
5667         if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu),
5668                         vmx_instruction_info, false, sizeof(operand), &gva))
5669                 return 1;
5670         r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
5671         if (r != X86EMUL_CONTINUE)
5672                 return kvm_handle_memory_failure(vcpu, r, &e);
5673
5674         /*
5675          * Nested EPT roots are always held through guest_mmu,
5676          * not root_mmu.
5677          */
5678         mmu = &vcpu->arch.guest_mmu;
5679
5680         switch (type) {
5681         case VMX_EPT_EXTENT_CONTEXT:
5682                 if (!nested_vmx_check_eptp(vcpu, operand.eptp))
5683                         return nested_vmx_fail(vcpu,
5684                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
5685
5686                 roots_to_free = 0;
5687                 if (nested_ept_root_matches(mmu->root.hpa, mmu->root.pgd,
5688                                             operand.eptp))
5689                         roots_to_free |= KVM_MMU_ROOT_CURRENT;
5690
5691                 for (i = 0; i < KVM_MMU_NUM_PREV_ROOTS; i++) {
5692                         if (nested_ept_root_matches(mmu->prev_roots[i].hpa,
5693                                                     mmu->prev_roots[i].pgd,
5694                                                     operand.eptp))
5695                                 roots_to_free |= KVM_MMU_ROOT_PREVIOUS(i);
5696                 }
5697                 break;
5698         case VMX_EPT_EXTENT_GLOBAL:
5699                 roots_to_free = KVM_MMU_ROOTS_ALL;
5700                 break;
5701         default:
5702                 BUG();
5703                 break;
5704         }
5705
5706         if (roots_to_free)
5707                 kvm_mmu_free_roots(vcpu->kvm, mmu, roots_to_free);
5708
5709         return nested_vmx_succeed(vcpu);
5710 }
5711
5712 static int handle_invvpid(struct kvm_vcpu *vcpu)
5713 {
5714         struct vcpu_vmx *vmx = to_vmx(vcpu);
5715         u32 vmx_instruction_info;
5716         unsigned long type, types;
5717         gva_t gva;
5718         struct x86_exception e;
5719         struct {
5720                 u64 vpid;
5721                 u64 gla;
5722         } operand;
5723         u16 vpid02;
5724         int r, gpr_index;
5725
5726         if (!(vmx->nested.msrs.secondary_ctls_high &
5727               SECONDARY_EXEC_ENABLE_VPID) ||
5728                         !(vmx->nested.msrs.vpid_caps & VMX_VPID_INVVPID_BIT)) {
5729                 kvm_queue_exception(vcpu, UD_VECTOR);
5730                 return 1;
5731         }
5732
5733         if (!nested_vmx_check_permission(vcpu))
5734                 return 1;
5735
5736         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5737         gpr_index = vmx_get_instr_info_reg2(vmx_instruction_info);
5738         type = kvm_register_read(vcpu, gpr_index);
5739
5740         types = (vmx->nested.msrs.vpid_caps &
5741                         VMX_VPID_EXTENT_SUPPORTED_MASK) >> 8;
5742
5743         if (type >= 32 || !(types & (1 << type)))
5744                 return nested_vmx_fail(vcpu,
5745                         VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
5746
5747         /* according to the intel vmx instruction reference, the memory
5748          * operand is read even if it isn't needed (e.g., for type==global)
5749          */
5750         if (get_vmx_mem_address(vcpu, vmx_get_exit_qual(vcpu),
5751                         vmx_instruction_info, false, sizeof(operand), &gva))
5752                 return 1;
5753         r = kvm_read_guest_virt(vcpu, gva, &operand, sizeof(operand), &e);
5754         if (r != X86EMUL_CONTINUE)
5755                 return kvm_handle_memory_failure(vcpu, r, &e);
5756
5757         if (operand.vpid >> 16)
5758                 return nested_vmx_fail(vcpu,
5759                         VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
5760
5761         vpid02 = nested_get_vpid02(vcpu);
5762         switch (type) {
5763         case VMX_VPID_EXTENT_INDIVIDUAL_ADDR:
5764                 if (!operand.vpid ||
5765                     is_noncanonical_address(operand.gla, vcpu))
5766                         return nested_vmx_fail(vcpu,
5767                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
5768                 vpid_sync_vcpu_addr(vpid02, operand.gla);
5769                 break;
5770         case VMX_VPID_EXTENT_SINGLE_CONTEXT:
5771         case VMX_VPID_EXTENT_SINGLE_NON_GLOBAL:
5772                 if (!operand.vpid)
5773                         return nested_vmx_fail(vcpu,
5774                                 VMXERR_INVALID_OPERAND_TO_INVEPT_INVVPID);
5775                 vpid_sync_context(vpid02);
5776                 break;
5777         case VMX_VPID_EXTENT_ALL_CONTEXT:
5778                 vpid_sync_context(vpid02);
5779                 break;
5780         default:
5781                 WARN_ON_ONCE(1);
5782                 return kvm_skip_emulated_instruction(vcpu);
5783         }
5784
5785         /*
5786          * Sync the shadow page tables if EPT is disabled, L1 is invalidating
5787          * linear mappings for L2 (tagged with L2's VPID).  Free all guest
5788          * roots as VPIDs are not tracked in the MMU role.
5789          *
5790          * Note, this operates on root_mmu, not guest_mmu, as L1 and L2 share
5791          * an MMU when EPT is disabled.
5792          *
5793          * TODO: sync only the affected SPTEs for INVDIVIDUAL_ADDR.
5794          */
5795         if (!enable_ept)
5796                 kvm_mmu_free_guest_mode_roots(vcpu->kvm, &vcpu->arch.root_mmu);
5797
5798         return nested_vmx_succeed(vcpu);
5799 }
5800
5801 static int nested_vmx_eptp_switching(struct kvm_vcpu *vcpu,
5802                                      struct vmcs12 *vmcs12)
5803 {
5804         u32 index = kvm_rcx_read(vcpu);
5805         u64 new_eptp;
5806
5807         if (WARN_ON_ONCE(!nested_cpu_has_ept(vmcs12)))
5808                 return 1;
5809         if (index >= VMFUNC_EPTP_ENTRIES)
5810                 return 1;
5811
5812         if (kvm_vcpu_read_guest_page(vcpu, vmcs12->eptp_list_address >> PAGE_SHIFT,
5813                                      &new_eptp, index * 8, 8))
5814                 return 1;
5815
5816         /*
5817          * If the (L2) guest does a vmfunc to the currently
5818          * active ept pointer, we don't have to do anything else
5819          */
5820         if (vmcs12->ept_pointer != new_eptp) {
5821                 if (!nested_vmx_check_eptp(vcpu, new_eptp))
5822                         return 1;
5823
5824                 vmcs12->ept_pointer = new_eptp;
5825                 nested_ept_new_eptp(vcpu);
5826
5827                 if (!nested_cpu_has_vpid(vmcs12))
5828                         kvm_make_request(KVM_REQ_TLB_FLUSH_GUEST, vcpu);
5829         }
5830
5831         return 0;
5832 }
5833
5834 static int handle_vmfunc(struct kvm_vcpu *vcpu)
5835 {
5836         struct vcpu_vmx *vmx = to_vmx(vcpu);
5837         struct vmcs12 *vmcs12;
5838         u32 function = kvm_rax_read(vcpu);
5839
5840         /*
5841          * VMFUNC is only supported for nested guests, but we always enable the
5842          * secondary control for simplicity; for non-nested mode, fake that we
5843          * didn't by injecting #UD.
5844          */
5845         if (!is_guest_mode(vcpu)) {
5846                 kvm_queue_exception(vcpu, UD_VECTOR);
5847                 return 1;
5848         }
5849
5850         vmcs12 = get_vmcs12(vcpu);
5851
5852         /*
5853          * #UD on out-of-bounds function has priority over VM-Exit, and VMFUNC
5854          * is enabled in vmcs02 if and only if it's enabled in vmcs12.
5855          */
5856         if (WARN_ON_ONCE((function > 63) || !nested_cpu_has_vmfunc(vmcs12))) {
5857                 kvm_queue_exception(vcpu, UD_VECTOR);
5858                 return 1;
5859         }
5860
5861         if (!(vmcs12->vm_function_control & BIT_ULL(function)))
5862                 goto fail;
5863
5864         switch (function) {
5865         case 0:
5866                 if (nested_vmx_eptp_switching(vcpu, vmcs12))
5867                         goto fail;
5868                 break;
5869         default:
5870                 goto fail;
5871         }
5872         return kvm_skip_emulated_instruction(vcpu);
5873
5874 fail:
5875         /*
5876          * This is effectively a reflected VM-Exit, as opposed to a synthesized
5877          * nested VM-Exit.  Pass the original exit reason, i.e. don't hardcode
5878          * EXIT_REASON_VMFUNC as the exit reason.
5879          */
5880         nested_vmx_vmexit(vcpu, vmx->exit_reason.full,
5881                           vmx_get_intr_info(vcpu),
5882                           vmx_get_exit_qual(vcpu));
5883         return 1;
5884 }
5885
5886 /*
5887  * Return true if an IO instruction with the specified port and size should cause
5888  * a VM-exit into L1.
5889  */
5890 bool nested_vmx_check_io_bitmaps(struct kvm_vcpu *vcpu, unsigned int port,
5891                                  int size)
5892 {
5893         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
5894         gpa_t bitmap, last_bitmap;
5895         u8 b;
5896
5897         last_bitmap = INVALID_GPA;
5898         b = -1;
5899
5900         while (size > 0) {
5901                 if (port < 0x8000)
5902                         bitmap = vmcs12->io_bitmap_a;
5903                 else if (port < 0x10000)
5904                         bitmap = vmcs12->io_bitmap_b;
5905                 else
5906                         return true;
5907                 bitmap += (port & 0x7fff) / 8;
5908
5909                 if (last_bitmap != bitmap)
5910                         if (kvm_vcpu_read_guest(vcpu, bitmap, &b, 1))
5911                                 return true;
5912                 if (b & (1 << (port & 7)))
5913                         return true;
5914
5915                 port++;
5916                 size--;
5917                 last_bitmap = bitmap;
5918         }
5919
5920         return false;
5921 }
5922
5923 static bool nested_vmx_exit_handled_io(struct kvm_vcpu *vcpu,
5924                                        struct vmcs12 *vmcs12)
5925 {
5926         unsigned long exit_qualification;
5927         unsigned short port;
5928         int size;
5929
5930         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_IO_BITMAPS))
5931                 return nested_cpu_has(vmcs12, CPU_BASED_UNCOND_IO_EXITING);
5932
5933         exit_qualification = vmx_get_exit_qual(vcpu);
5934
5935         port = exit_qualification >> 16;
5936         size = (exit_qualification & 7) + 1;
5937
5938         return nested_vmx_check_io_bitmaps(vcpu, port, size);
5939 }
5940
5941 /*
5942  * Return 1 if we should exit from L2 to L1 to handle an MSR access,
5943  * rather than handle it ourselves in L0. I.e., check whether L1 expressed
5944  * disinterest in the current event (read or write a specific MSR) by using an
5945  * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps.
5946  */
5947 static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu,
5948                                         struct vmcs12 *vmcs12,
5949                                         union vmx_exit_reason exit_reason)
5950 {
5951         u32 msr_index = kvm_rcx_read(vcpu);
5952         gpa_t bitmap;
5953
5954         if (!nested_cpu_has(vmcs12, CPU_BASED_USE_MSR_BITMAPS))
5955                 return true;
5956
5957         /*
5958          * The MSR_BITMAP page is divided into four 1024-byte bitmaps,
5959          * for the four combinations of read/write and low/high MSR numbers.
5960          * First we need to figure out which of the four to use:
5961          */
5962         bitmap = vmcs12->msr_bitmap;
5963         if (exit_reason.basic == EXIT_REASON_MSR_WRITE)
5964                 bitmap += 2048;
5965         if (msr_index >= 0xc0000000) {
5966                 msr_index -= 0xc0000000;
5967                 bitmap += 1024;
5968         }
5969
5970         /* Then read the msr_index'th bit from this bitmap: */
5971         if (msr_index < 1024*8) {
5972                 unsigned char b;
5973                 if (kvm_vcpu_read_guest(vcpu, bitmap + msr_index/8, &b, 1))
5974                         return true;
5975                 return 1 & (b >> (msr_index & 7));
5976         } else
5977                 return true; /* let L1 handle the wrong parameter */
5978 }
5979
5980 /*
5981  * Return 1 if we should exit from L2 to L1 to handle a CR access exit,
5982  * rather than handle it ourselves in L0. I.e., check if L1 wanted to
5983  * intercept (via guest_host_mask etc.) the current event.
5984  */
5985 static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
5986         struct vmcs12 *vmcs12)
5987 {
5988         unsigned long exit_qualification = vmx_get_exit_qual(vcpu);
5989         int cr = exit_qualification & 15;
5990         int reg;
5991         unsigned long val;
5992
5993         switch ((exit_qualification >> 4) & 3) {
5994         case 0: /* mov to cr */
5995                 reg = (exit_qualification >> 8) & 15;
5996                 val = kvm_register_read(vcpu, reg);
5997                 switch (cr) {
5998                 case 0:
5999                         if (vmcs12->cr0_guest_host_mask &
6000                             (val ^ vmcs12->cr0_read_shadow))
6001                                 return true;
6002                         break;
6003                 case 3:
6004                         if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING))
6005                                 return true;
6006                         break;
6007                 case 4:
6008                         if (vmcs12->cr4_guest_host_mask &
6009                             (vmcs12->cr4_read_shadow ^ val))
6010                                 return true;
6011                         break;
6012                 case 8:
6013                         if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING))
6014                                 return true;
6015                         break;
6016                 }
6017                 break;
6018         case 2: /* clts */
6019                 if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) &&
6020                     (vmcs12->cr0_read_shadow & X86_CR0_TS))
6021                         return true;
6022                 break;
6023         case 1: /* mov from cr */
6024                 switch (cr) {
6025                 case 3:
6026                         if (vmcs12->cpu_based_vm_exec_control &
6027                             CPU_BASED_CR3_STORE_EXITING)
6028                                 return true;
6029                         break;
6030                 case 8:
6031                         if (vmcs12->cpu_based_vm_exec_control &
6032                             CPU_BASED_CR8_STORE_EXITING)
6033                                 return true;
6034                         break;
6035                 }
6036                 break;
6037         case 3: /* lmsw */
6038                 /*
6039                  * lmsw can change bits 1..3 of cr0, and only set bit 0 of
6040                  * cr0. Other attempted changes are ignored, with no exit.
6041                  */
6042                 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
6043                 if (vmcs12->cr0_guest_host_mask & 0xe &
6044                     (val ^ vmcs12->cr0_read_shadow))
6045                         return true;
6046                 if ((vmcs12->cr0_guest_host_mask & 0x1) &&
6047                     !(vmcs12->cr0_read_shadow & 0x1) &&
6048                     (val & 0x1))
6049                         return true;
6050                 break;
6051         }
6052         return false;
6053 }
6054
6055 static bool nested_vmx_exit_handled_encls(struct kvm_vcpu *vcpu,
6056                                           struct vmcs12 *vmcs12)
6057 {
6058         u32 encls_leaf;
6059
6060         if (!guest_cpuid_has(vcpu, X86_FEATURE_SGX) ||
6061             !nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENCLS_EXITING))
6062                 return false;
6063
6064         encls_leaf = kvm_rax_read(vcpu);
6065         if (encls_leaf > 62)
6066                 encls_leaf = 63;
6067         return vmcs12->encls_exiting_bitmap & BIT_ULL(encls_leaf);
6068 }
6069
6070 static bool nested_vmx_exit_handled_vmcs_access(struct kvm_vcpu *vcpu,
6071         struct vmcs12 *vmcs12, gpa_t bitmap)
6072 {
6073         u32 vmx_instruction_info;
6074         unsigned long field;
6075         u8 b;
6076
6077         if (!nested_cpu_has_shadow_vmcs(vmcs12))
6078                 return true;
6079
6080         /* Decode instruction info and find the field to access */
6081         vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
6082         field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
6083
6084         /* Out-of-range fields always cause a VM exit from L2 to L1 */
6085         if (field >> 15)
6086                 return true;
6087
6088         if (kvm_vcpu_read_guest(vcpu, bitmap + field/8, &b, 1))
6089                 return true;
6090
6091         return 1 & (b >> (field & 7));
6092 }
6093
6094 static bool nested_vmx_exit_handled_mtf(struct vmcs12 *vmcs12)
6095 {
6096         u32 entry_intr_info = vmcs12->vm_entry_intr_info_field;
6097
6098         if (nested_cpu_has_mtf(vmcs12))
6099                 return true;
6100
6101         /*
6102          * An MTF VM-exit may be injected into the guest by setting the
6103          * interruption-type to 7 (other event) and the vector field to 0. Such
6104          * is the case regardless of the 'monitor trap flag' VM-execution
6105          * control.
6106          */
6107         return entry_intr_info == (INTR_INFO_VALID_MASK
6108                                    | INTR_TYPE_OTHER_EVENT);
6109 }
6110
6111 /*
6112  * Return true if L0 wants to handle an exit from L2 regardless of whether or not
6113  * L1 wants the exit.  Only call this when in is_guest_mode (L2).
6114  */
6115 static bool nested_vmx_l0_wants_exit(struct kvm_vcpu *vcpu,
6116                                      union vmx_exit_reason exit_reason)
6117 {
6118         u32 intr_info;
6119
6120         switch ((u16)exit_reason.basic) {
6121         case EXIT_REASON_EXCEPTION_NMI:
6122                 intr_info = vmx_get_intr_info(vcpu);
6123                 if (is_nmi(intr_info))
6124                         return true;
6125                 else if (is_page_fault(intr_info))
6126                         return vcpu->arch.apf.host_apf_flags ||
6127                                vmx_need_pf_intercept(vcpu);
6128                 else if (is_debug(intr_info) &&
6129                          vcpu->guest_debug &
6130                          (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
6131                         return true;
6132                 else if (is_breakpoint(intr_info) &&
6133                          vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
6134                         return true;
6135                 else if (is_alignment_check(intr_info) &&
6136                          !vmx_guest_inject_ac(vcpu))
6137                         return true;
6138                 return false;
6139         case EXIT_REASON_EXTERNAL_INTERRUPT:
6140                 return true;
6141         case EXIT_REASON_MCE_DURING_VMENTRY:
6142                 return true;
6143         case EXIT_REASON_EPT_VIOLATION:
6144                 /*
6145                  * L0 always deals with the EPT violation. If nested EPT is
6146                  * used, and the nested mmu code discovers that the address is
6147                  * missing in the guest EPT table (EPT12), the EPT violation
6148                  * will be injected with nested_ept_inject_page_fault()
6149                  */
6150                 return true;
6151         case EXIT_REASON_EPT_MISCONFIG:
6152                 /*
6153                  * L2 never uses directly L1's EPT, but rather L0's own EPT
6154                  * table (shadow on EPT) or a merged EPT table that L0 built
6155                  * (EPT on EPT). So any problems with the structure of the
6156                  * table is L0's fault.
6157                  */
6158                 return true;
6159         case EXIT_REASON_PREEMPTION_TIMER:
6160                 return true;
6161         case EXIT_REASON_PML_FULL:
6162                 /*
6163                  * PML is emulated for an L1 VMM and should never be enabled in
6164                  * vmcs02, always "handle" PML_FULL by exiting to userspace.
6165                  */
6166                 return true;
6167         case EXIT_REASON_VMFUNC:
6168                 /* VM functions are emulated through L2->L0 vmexits. */
6169                 return true;
6170         case EXIT_REASON_BUS_LOCK:
6171                 /*
6172                  * At present, bus lock VM exit is never exposed to L1.
6173                  * Handle L2's bus locks in L0 directly.
6174                  */
6175                 return true;
6176         default:
6177                 break;
6178         }
6179         return false;
6180 }
6181
6182 /*
6183  * Return 1 if L1 wants to intercept an exit from L2.  Only call this when in
6184  * is_guest_mode (L2).
6185  */
6186 static bool nested_vmx_l1_wants_exit(struct kvm_vcpu *vcpu,
6187                                      union vmx_exit_reason exit_reason)
6188 {
6189         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
6190         u32 intr_info;
6191
6192         switch ((u16)exit_reason.basic) {
6193         case EXIT_REASON_EXCEPTION_NMI:
6194                 intr_info = vmx_get_intr_info(vcpu);
6195                 if (is_nmi(intr_info))
6196                         return true;
6197                 else if (is_page_fault(intr_info))
6198                         return true;
6199                 return vmcs12->exception_bitmap &
6200                                 (1u << (intr_info & INTR_INFO_VECTOR_MASK));
6201         case EXIT_REASON_EXTERNAL_INTERRUPT:
6202                 return nested_exit_on_intr(vcpu);
6203         case EXIT_REASON_TRIPLE_FAULT:
6204                 return true;
6205         case EXIT_REASON_INTERRUPT_WINDOW:
6206                 return nested_cpu_has(vmcs12, CPU_BASED_INTR_WINDOW_EXITING);
6207         case EXIT_REASON_NMI_WINDOW:
6208                 return nested_cpu_has(vmcs12, CPU_BASED_NMI_WINDOW_EXITING);
6209         case EXIT_REASON_TASK_SWITCH:
6210                 return true;
6211         case EXIT_REASON_CPUID:
6212                 return true;
6213         case EXIT_REASON_HLT:
6214                 return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);
6215         case EXIT_REASON_INVD:
6216                 return true;
6217         case EXIT_REASON_INVLPG:
6218                 return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
6219         case EXIT_REASON_RDPMC:
6220                 return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING);
6221         case EXIT_REASON_RDRAND:
6222                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDRAND_EXITING);
6223         case EXIT_REASON_RDSEED:
6224                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_RDSEED_EXITING);
6225         case EXIT_REASON_RDTSC: case EXIT_REASON_RDTSCP:
6226                 return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
6227         case EXIT_REASON_VMREAD:
6228                 return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
6229                         vmcs12->vmread_bitmap);
6230         case EXIT_REASON_VMWRITE:
6231                 return nested_vmx_exit_handled_vmcs_access(vcpu, vmcs12,
6232                         vmcs12->vmwrite_bitmap);
6233         case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
6234         case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
6235         case EXIT_REASON_VMPTRST: case EXIT_REASON_VMRESUME:
6236         case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
6237         case EXIT_REASON_INVEPT: case EXIT_REASON_INVVPID:
6238                 /*
6239                  * VMX instructions trap unconditionally. This allows L1 to
6240                  * emulate them for its L2 guest, i.e., allows 3-level nesting!
6241                  */
6242                 return true;
6243         case EXIT_REASON_CR_ACCESS:
6244                 return nested_vmx_exit_handled_cr(vcpu, vmcs12);
6245         case EXIT_REASON_DR_ACCESS:
6246                 return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING);
6247         case EXIT_REASON_IO_INSTRUCTION:
6248                 return nested_vmx_exit_handled_io(vcpu, vmcs12);
6249         case EXIT_REASON_GDTR_IDTR: case EXIT_REASON_LDTR_TR:
6250                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_DESC);
6251         case EXIT_REASON_MSR_READ:
6252         case EXIT_REASON_MSR_WRITE:
6253                 return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason);
6254         case EXIT_REASON_INVALID_STATE:
6255                 return true;
6256         case EXIT_REASON_MWAIT_INSTRUCTION:
6257                 return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING);
6258         case EXIT_REASON_MONITOR_TRAP_FLAG:
6259                 return nested_vmx_exit_handled_mtf(vmcs12);
6260         case EXIT_REASON_MONITOR_INSTRUCTION:
6261                 return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING);
6262         case EXIT_REASON_PAUSE_INSTRUCTION:
6263                 return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) ||
6264                         nested_cpu_has2(vmcs12,
6265                                 SECONDARY_EXEC_PAUSE_LOOP_EXITING);
6266         case EXIT_REASON_MCE_DURING_VMENTRY:
6267                 return true;
6268         case EXIT_REASON_TPR_BELOW_THRESHOLD:
6269                 return nested_cpu_has(vmcs12, CPU_BASED_TPR_SHADOW);
6270         case EXIT_REASON_APIC_ACCESS:
6271         case EXIT_REASON_APIC_WRITE:
6272         case EXIT_REASON_EOI_INDUCED:
6273                 /*
6274                  * The controls for "virtualize APIC accesses," "APIC-
6275                  * register virtualization," and "virtual-interrupt
6276                  * delivery" only come from vmcs12.
6277                  */
6278                 return true;
6279         case EXIT_REASON_INVPCID:
6280                 return
6281                         nested_cpu_has2(vmcs12, SECONDARY_EXEC_ENABLE_INVPCID) &&
6282                         nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
6283         case EXIT_REASON_WBINVD:
6284                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING);
6285         case EXIT_REASON_XSETBV:
6286                 return true;
6287         case EXIT_REASON_XSAVES: case EXIT_REASON_XRSTORS:
6288                 /*
6289                  * This should never happen, since it is not possible to
6290                  * set XSS to a non-zero value---neither in L1 nor in L2.
6291                  * If if it were, XSS would have to be checked against
6292                  * the XSS exit bitmap in vmcs12.
6293                  */
6294                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_XSAVES);
6295         case EXIT_REASON_UMWAIT:
6296         case EXIT_REASON_TPAUSE:
6297                 return nested_cpu_has2(vmcs12,
6298                         SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE);
6299         case EXIT_REASON_ENCLS:
6300                 return nested_vmx_exit_handled_encls(vcpu, vmcs12);
6301         case EXIT_REASON_NOTIFY:
6302                 /* Notify VM exit is not exposed to L1 */
6303                 return false;
6304         default:
6305                 return true;
6306         }
6307 }
6308
6309 /*
6310  * Conditionally reflect a VM-Exit into L1.  Returns %true if the VM-Exit was
6311  * reflected into L1.
6312  */
6313 bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
6314 {
6315         struct vcpu_vmx *vmx = to_vmx(vcpu);
6316         union vmx_exit_reason exit_reason = vmx->exit_reason;
6317         unsigned long exit_qual;
6318         u32 exit_intr_info;
6319
6320         WARN_ON_ONCE(vmx->nested.nested_run_pending);
6321
6322         /*
6323          * Late nested VM-Fail shares the same flow as nested VM-Exit since KVM
6324          * has already loaded L2's state.
6325          */
6326         if (unlikely(vmx->fail)) {
6327                 trace_kvm_nested_vmenter_failed(
6328                         "hardware VM-instruction error: ",
6329                         vmcs_read32(VM_INSTRUCTION_ERROR));
6330                 exit_intr_info = 0;
6331                 exit_qual = 0;
6332                 goto reflect_vmexit;
6333         }
6334
6335         trace_kvm_nested_vmexit(vcpu, KVM_ISA_VMX);
6336
6337         /* If L0 (KVM) wants the exit, it trumps L1's desires. */
6338         if (nested_vmx_l0_wants_exit(vcpu, exit_reason))
6339                 return false;
6340
6341         /* If L1 doesn't want the exit, handle it in L0. */
6342         if (!nested_vmx_l1_wants_exit(vcpu, exit_reason))
6343                 return false;
6344
6345         /*
6346          * vmcs.VM_EXIT_INTR_INFO is only valid for EXCEPTION_NMI exits.  For
6347          * EXTERNAL_INTERRUPT, the value for vmcs12->vm_exit_intr_info would
6348          * need to be synthesized by querying the in-kernel LAPIC, but external
6349          * interrupts are never reflected to L1 so it's a non-issue.
6350          */
6351         exit_intr_info = vmx_get_intr_info(vcpu);
6352         if (is_exception_with_error_code(exit_intr_info)) {
6353                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
6354
6355                 vmcs12->vm_exit_intr_error_code =
6356                         vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
6357         }
6358         exit_qual = vmx_get_exit_qual(vcpu);
6359
6360 reflect_vmexit:
6361         nested_vmx_vmexit(vcpu, exit_reason.full, exit_intr_info, exit_qual);
6362         return true;
6363 }
6364
6365 static int vmx_get_nested_state(struct kvm_vcpu *vcpu,
6366                                 struct kvm_nested_state __user *user_kvm_nested_state,
6367                                 u32 user_data_size)
6368 {
6369         struct vcpu_vmx *vmx;
6370         struct vmcs12 *vmcs12;
6371         struct kvm_nested_state kvm_state = {
6372                 .flags = 0,
6373                 .format = KVM_STATE_NESTED_FORMAT_VMX,
6374                 .size = sizeof(kvm_state),
6375                 .hdr.vmx.flags = 0,
6376                 .hdr.vmx.vmxon_pa = INVALID_GPA,
6377                 .hdr.vmx.vmcs12_pa = INVALID_GPA,
6378                 .hdr.vmx.preemption_timer_deadline = 0,
6379         };
6380         struct kvm_vmx_nested_state_data __user *user_vmx_nested_state =
6381                 &user_kvm_nested_state->data.vmx[0];
6382
6383         if (!vcpu)
6384                 return kvm_state.size + sizeof(*user_vmx_nested_state);
6385
6386         vmx = to_vmx(vcpu);
6387         vmcs12 = get_vmcs12(vcpu);
6388
6389         if (nested_vmx_allowed(vcpu) &&
6390             (vmx->nested.vmxon || vmx->nested.smm.vmxon)) {
6391                 kvm_state.hdr.vmx.vmxon_pa = vmx->nested.vmxon_ptr;
6392                 kvm_state.hdr.vmx.vmcs12_pa = vmx->nested.current_vmptr;
6393
6394                 if (vmx_has_valid_vmcs12(vcpu)) {
6395                         kvm_state.size += sizeof(user_vmx_nested_state->vmcs12);
6396
6397                         /* 'hv_evmcs_vmptr' can also be EVMPTR_MAP_PENDING here */
6398                         if (vmx->nested.hv_evmcs_vmptr != EVMPTR_INVALID)
6399                                 kvm_state.flags |= KVM_STATE_NESTED_EVMCS;
6400
6401                         if (is_guest_mode(vcpu) &&
6402                             nested_cpu_has_shadow_vmcs(vmcs12) &&
6403                             vmcs12->vmcs_link_pointer != INVALID_GPA)
6404                                 kvm_state.size += sizeof(user_vmx_nested_state->shadow_vmcs12);
6405                 }
6406
6407                 if (vmx->nested.smm.vmxon)
6408                         kvm_state.hdr.vmx.smm.flags |= KVM_STATE_NESTED_SMM_VMXON;
6409
6410                 if (vmx->nested.smm.guest_mode)
6411                         kvm_state.hdr.vmx.smm.flags |= KVM_STATE_NESTED_SMM_GUEST_MODE;
6412
6413                 if (is_guest_mode(vcpu)) {
6414                         kvm_state.flags |= KVM_STATE_NESTED_GUEST_MODE;
6415
6416                         if (vmx->nested.nested_run_pending)
6417                                 kvm_state.flags |= KVM_STATE_NESTED_RUN_PENDING;
6418
6419                         if (vmx->nested.mtf_pending)
6420                                 kvm_state.flags |= KVM_STATE_NESTED_MTF_PENDING;
6421
6422                         if (nested_cpu_has_preemption_timer(vmcs12) &&
6423                             vmx->nested.has_preemption_timer_deadline) {
6424                                 kvm_state.hdr.vmx.flags |=
6425                                         KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE;
6426                                 kvm_state.hdr.vmx.preemption_timer_deadline =
6427                                         vmx->nested.preemption_timer_deadline;
6428                         }
6429                 }
6430         }
6431
6432         if (user_data_size < kvm_state.size)
6433                 goto out;
6434
6435         if (copy_to_user(user_kvm_nested_state, &kvm_state, sizeof(kvm_state)))
6436                 return -EFAULT;
6437
6438         if (!vmx_has_valid_vmcs12(vcpu))
6439                 goto out;
6440
6441         /*
6442          * When running L2, the authoritative vmcs12 state is in the
6443          * vmcs02. When running L1, the authoritative vmcs12 state is
6444          * in the shadow or enlightened vmcs linked to vmcs01, unless
6445          * need_vmcs12_to_shadow_sync is set, in which case, the authoritative
6446          * vmcs12 state is in the vmcs12 already.
6447          */
6448         if (is_guest_mode(vcpu)) {
6449                 sync_vmcs02_to_vmcs12(vcpu, vmcs12);
6450                 sync_vmcs02_to_vmcs12_rare(vcpu, vmcs12);
6451         } else  {
6452                 copy_vmcs02_to_vmcs12_rare(vcpu, get_vmcs12(vcpu));
6453                 if (!vmx->nested.need_vmcs12_to_shadow_sync) {
6454                         if (evmptr_is_valid(vmx->nested.hv_evmcs_vmptr))
6455                                 /*
6456                                  * L1 hypervisor is not obliged to keep eVMCS
6457                                  * clean fields data always up-to-date while
6458                                  * not in guest mode, 'hv_clean_fields' is only
6459                                  * supposed to be actual upon vmentry so we need
6460                                  * to ignore it here and do full copy.
6461                                  */
6462                                 copy_enlightened_to_vmcs12(vmx, 0);
6463                         else if (enable_shadow_vmcs)
6464                                 copy_shadow_to_vmcs12(vmx);
6465                 }
6466         }
6467
6468         BUILD_BUG_ON(sizeof(user_vmx_nested_state->vmcs12) < VMCS12_SIZE);
6469         BUILD_BUG_ON(sizeof(user_vmx_nested_state->shadow_vmcs12) < VMCS12_SIZE);
6470
6471         /*
6472          * Copy over the full allocated size of vmcs12 rather than just the size
6473          * of the struct.
6474          */
6475         if (copy_to_user(user_vmx_nested_state->vmcs12, vmcs12, VMCS12_SIZE))
6476                 return -EFAULT;
6477
6478         if (nested_cpu_has_shadow_vmcs(vmcs12) &&
6479             vmcs12->vmcs_link_pointer != INVALID_GPA) {
6480                 if (copy_to_user(user_vmx_nested_state->shadow_vmcs12,
6481                                  get_shadow_vmcs12(vcpu), VMCS12_SIZE))
6482                         return -EFAULT;
6483         }
6484 out:
6485         return kvm_state.size;
6486 }
6487
6488 void vmx_leave_nested(struct kvm_vcpu *vcpu)
6489 {
6490         if (is_guest_mode(vcpu)) {
6491                 to_vmx(vcpu)->nested.nested_run_pending = 0;
6492                 nested_vmx_vmexit(vcpu, -1, 0, 0);
6493         }
6494         free_nested(vcpu);
6495 }
6496
6497 static int vmx_set_nested_state(struct kvm_vcpu *vcpu,
6498                                 struct kvm_nested_state __user *user_kvm_nested_state,
6499                                 struct kvm_nested_state *kvm_state)
6500 {
6501         struct vcpu_vmx *vmx = to_vmx(vcpu);
6502         struct vmcs12 *vmcs12;
6503         enum vm_entry_failure_code ignored;
6504         struct kvm_vmx_nested_state_data __user *user_vmx_nested_state =
6505                 &user_kvm_nested_state->data.vmx[0];
6506         int ret;
6507
6508         if (kvm_state->format != KVM_STATE_NESTED_FORMAT_VMX)
6509                 return -EINVAL;
6510
6511         if (kvm_state->hdr.vmx.vmxon_pa == INVALID_GPA) {
6512                 if (kvm_state->hdr.vmx.smm.flags)
6513                         return -EINVAL;
6514
6515                 if (kvm_state->hdr.vmx.vmcs12_pa != INVALID_GPA)
6516                         return -EINVAL;
6517
6518                 /*
6519                  * KVM_STATE_NESTED_EVMCS used to signal that KVM should
6520                  * enable eVMCS capability on vCPU. However, since then
6521                  * code was changed such that flag signals vmcs12 should
6522                  * be copied into eVMCS in guest memory.
6523                  *
6524                  * To preserve backwards compatability, allow user
6525                  * to set this flag even when there is no VMXON region.
6526                  */
6527                 if (kvm_state->flags & ~KVM_STATE_NESTED_EVMCS)
6528                         return -EINVAL;
6529         } else {
6530                 if (!nested_vmx_allowed(vcpu))
6531                         return -EINVAL;
6532
6533                 if (!page_address_valid(vcpu, kvm_state->hdr.vmx.vmxon_pa))
6534                         return -EINVAL;
6535         }
6536
6537         if ((kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
6538             (kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
6539                 return -EINVAL;
6540
6541         if (kvm_state->hdr.vmx.smm.flags &
6542             ~(KVM_STATE_NESTED_SMM_GUEST_MODE | KVM_STATE_NESTED_SMM_VMXON))
6543                 return -EINVAL;
6544
6545         if (kvm_state->hdr.vmx.flags & ~KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE)
6546                 return -EINVAL;
6547
6548         /*
6549          * SMM temporarily disables VMX, so we cannot be in guest mode,
6550          * nor can VMLAUNCH/VMRESUME be pending.  Outside SMM, SMM flags
6551          * must be zero.
6552          */
6553         if (is_smm(vcpu) ?
6554                 (kvm_state->flags &
6555                  (KVM_STATE_NESTED_GUEST_MODE | KVM_STATE_NESTED_RUN_PENDING))
6556                 : kvm_state->hdr.vmx.smm.flags)
6557                 return -EINVAL;
6558
6559         if ((kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE) &&
6560             !(kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON))
6561                 return -EINVAL;
6562
6563         if ((kvm_state->flags & KVM_STATE_NESTED_EVMCS) &&
6564                 (!nested_vmx_allowed(vcpu) || !vmx->nested.enlightened_vmcs_enabled))
6565                         return -EINVAL;
6566
6567         vmx_leave_nested(vcpu);
6568
6569         if (kvm_state->hdr.vmx.vmxon_pa == INVALID_GPA)
6570                 return 0;
6571
6572         vmx->nested.vmxon_ptr = kvm_state->hdr.vmx.vmxon_pa;
6573         ret = enter_vmx_operation(vcpu);
6574         if (ret)
6575                 return ret;
6576
6577         /* Empty 'VMXON' state is permitted if no VMCS loaded */
6578         if (kvm_state->size < sizeof(*kvm_state) + sizeof(*vmcs12)) {
6579                 /* See vmx_has_valid_vmcs12.  */
6580                 if ((kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE) ||
6581                     (kvm_state->flags & KVM_STATE_NESTED_EVMCS) ||
6582                     (kvm_state->hdr.vmx.vmcs12_pa != INVALID_GPA))
6583                         return -EINVAL;
6584                 else
6585                         return 0;
6586         }
6587
6588         if (kvm_state->hdr.vmx.vmcs12_pa != INVALID_GPA) {
6589                 if (kvm_state->hdr.vmx.vmcs12_pa == kvm_state->hdr.vmx.vmxon_pa ||
6590                     !page_address_valid(vcpu, kvm_state->hdr.vmx.vmcs12_pa))
6591                         return -EINVAL;
6592
6593                 set_current_vmptr(vmx, kvm_state->hdr.vmx.vmcs12_pa);
6594         } else if (kvm_state->flags & KVM_STATE_NESTED_EVMCS) {
6595                 /*
6596                  * nested_vmx_handle_enlightened_vmptrld() cannot be called
6597                  * directly from here as HV_X64_MSR_VP_ASSIST_PAGE may not be
6598                  * restored yet. EVMCS will be mapped from
6599                  * nested_get_vmcs12_pages().
6600                  */
6601                 vmx->nested.hv_evmcs_vmptr = EVMPTR_MAP_PENDING;
6602                 kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
6603         } else {
6604                 return -EINVAL;
6605         }
6606
6607         if (kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_VMXON) {
6608                 vmx->nested.smm.vmxon = true;
6609                 vmx->nested.vmxon = false;
6610
6611                 if (kvm_state->hdr.vmx.smm.flags & KVM_STATE_NESTED_SMM_GUEST_MODE)
6612                         vmx->nested.smm.guest_mode = true;
6613         }
6614
6615         vmcs12 = get_vmcs12(vcpu);
6616         if (copy_from_user(vmcs12, user_vmx_nested_state->vmcs12, sizeof(*vmcs12)))
6617                 return -EFAULT;
6618
6619         if (vmcs12->hdr.revision_id != VMCS12_REVISION)
6620                 return -EINVAL;
6621
6622         if (!(kvm_state->flags & KVM_STATE_NESTED_GUEST_MODE))
6623                 return 0;
6624
6625         vmx->nested.nested_run_pending =
6626                 !!(kvm_state->flags & KVM_STATE_NESTED_RUN_PENDING);
6627
6628         vmx->nested.mtf_pending =
6629                 !!(kvm_state->flags & KVM_STATE_NESTED_MTF_PENDING);
6630
6631         ret = -EINVAL;
6632         if (nested_cpu_has_shadow_vmcs(vmcs12) &&
6633             vmcs12->vmcs_link_pointer != INVALID_GPA) {
6634                 struct vmcs12 *shadow_vmcs12 = get_shadow_vmcs12(vcpu);
6635
6636                 if (kvm_state->size <
6637                     sizeof(*kvm_state) +
6638                     sizeof(user_vmx_nested_state->vmcs12) + sizeof(*shadow_vmcs12))
6639                         goto error_guest_mode;
6640
6641                 if (copy_from_user(shadow_vmcs12,
6642                                    user_vmx_nested_state->shadow_vmcs12,
6643                                    sizeof(*shadow_vmcs12))) {
6644                         ret = -EFAULT;
6645                         goto error_guest_mode;
6646                 }
6647
6648                 if (shadow_vmcs12->hdr.revision_id != VMCS12_REVISION ||
6649                     !shadow_vmcs12->hdr.shadow_vmcs)
6650                         goto error_guest_mode;
6651         }
6652
6653         vmx->nested.has_preemption_timer_deadline = false;
6654         if (kvm_state->hdr.vmx.flags & KVM_STATE_VMX_PREEMPTION_TIMER_DEADLINE) {
6655                 vmx->nested.has_preemption_timer_deadline = true;
6656                 vmx->nested.preemption_timer_deadline =
6657                         kvm_state->hdr.vmx.preemption_timer_deadline;
6658         }
6659
6660         if (nested_vmx_check_controls(vcpu, vmcs12) ||
6661             nested_vmx_check_host_state(vcpu, vmcs12) ||
6662             nested_vmx_check_guest_state(vcpu, vmcs12, &ignored))
6663                 goto error_guest_mode;
6664
6665         vmx->nested.dirty_vmcs12 = true;
6666         vmx->nested.force_msr_bitmap_recalc = true;
6667         ret = nested_vmx_enter_non_root_mode(vcpu, false);
6668         if (ret)
6669                 goto error_guest_mode;
6670
6671         if (vmx->nested.mtf_pending)
6672                 kvm_make_request(KVM_REQ_EVENT, vcpu);
6673
6674         return 0;
6675
6676 error_guest_mode:
6677         vmx->nested.nested_run_pending = 0;
6678         return ret;
6679 }
6680
6681 void nested_vmx_set_vmcs_shadowing_bitmap(void)
6682 {
6683         if (enable_shadow_vmcs) {
6684                 vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap));
6685                 vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap));
6686         }
6687 }
6688
6689 /*
6690  * Indexing into the vmcs12 uses the VMCS encoding rotated left by 6.  Undo
6691  * that madness to get the encoding for comparison.
6692  */
6693 #define VMCS12_IDX_TO_ENC(idx) ((u16)(((u16)(idx) >> 6) | ((u16)(idx) << 10)))
6694
6695 static u64 nested_vmx_calc_vmcs_enum_msr(void)
6696 {
6697         /*
6698          * Note these are the so called "index" of the VMCS field encoding, not
6699          * the index into vmcs12.
6700          */
6701         unsigned int max_idx, idx;
6702         int i;
6703
6704         /*
6705          * For better or worse, KVM allows VMREAD/VMWRITE to all fields in
6706          * vmcs12, regardless of whether or not the associated feature is
6707          * exposed to L1.  Simply find the field with the highest index.
6708          */
6709         max_idx = 0;
6710         for (i = 0; i < nr_vmcs12_fields; i++) {
6711                 /* The vmcs12 table is very, very sparsely populated. */
6712                 if (!vmcs12_field_offsets[i])
6713                         continue;
6714
6715                 idx = vmcs_field_index(VMCS12_IDX_TO_ENC(i));
6716                 if (idx > max_idx)
6717                         max_idx = idx;
6718         }
6719
6720         return (u64)max_idx << VMCS_FIELD_INDEX_SHIFT;
6721 }
6722
6723 /*
6724  * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
6725  * returned for the various VMX controls MSRs when nested VMX is enabled.
6726  * The same values should also be used to verify that vmcs12 control fields are
6727  * valid during nested entry from L1 to L2.
6728  * Each of these control msrs has a low and high 32-bit half: A low bit is on
6729  * if the corresponding bit in the (32-bit) control field *must* be on, and a
6730  * bit in the high half is on if the corresponding bit in the control field
6731  * may be on. See also vmx_control_verify().
6732  */
6733 void nested_vmx_setup_ctls_msrs(struct vmcs_config *vmcs_conf, u32 ept_caps)
6734 {
6735         struct nested_vmx_msrs *msrs = &vmcs_conf->nested;
6736
6737         /*
6738          * Note that as a general rule, the high half of the MSRs (bits in
6739          * the control fields which may be 1) should be initialized by the
6740          * intersection of the underlying hardware's MSR (i.e., features which
6741          * can be supported) and the list of features we want to expose -
6742          * because they are known to be properly supported in our code.
6743          * Also, usually, the low half of the MSRs (bits which must be 1) can
6744          * be set to 0, meaning that L1 may turn off any of these bits. The
6745          * reason is that if one of these bits is necessary, it will appear
6746          * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
6747          * fields of vmcs01 and vmcs02, will turn these bits off - and
6748          * nested_vmx_l1_wants_exit() will not pass related exits to L1.
6749          * These rules have exceptions below.
6750          */
6751
6752         /* pin-based controls */
6753         msrs->pinbased_ctls_low =
6754                 PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
6755
6756         msrs->pinbased_ctls_high = vmcs_conf->pin_based_exec_ctrl;
6757         msrs->pinbased_ctls_high &=
6758                 PIN_BASED_EXT_INTR_MASK |
6759                 PIN_BASED_NMI_EXITING |
6760                 PIN_BASED_VIRTUAL_NMIS |
6761                 (enable_apicv ? PIN_BASED_POSTED_INTR : 0);
6762         msrs->pinbased_ctls_high |=
6763                 PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
6764                 PIN_BASED_VMX_PREEMPTION_TIMER;
6765
6766         /* exit controls */
6767         msrs->exit_ctls_low =
6768                 VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
6769
6770         msrs->exit_ctls_high = vmcs_conf->vmexit_ctrl;
6771         msrs->exit_ctls_high &=
6772 #ifdef CONFIG_X86_64
6773                 VM_EXIT_HOST_ADDR_SPACE_SIZE |
6774 #endif
6775                 VM_EXIT_LOAD_IA32_PAT | VM_EXIT_SAVE_IA32_PAT |
6776                 VM_EXIT_CLEAR_BNDCFGS;
6777         msrs->exit_ctls_high |=
6778                 VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR |
6779                 VM_EXIT_LOAD_IA32_EFER | VM_EXIT_SAVE_IA32_EFER |
6780                 VM_EXIT_SAVE_VMX_PREEMPTION_TIMER | VM_EXIT_ACK_INTR_ON_EXIT |
6781                 VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
6782
6783         /* We support free control of debug control saving. */
6784         msrs->exit_ctls_low &= ~VM_EXIT_SAVE_DEBUG_CONTROLS;
6785
6786         /* entry controls */
6787         msrs->entry_ctls_low =
6788                 VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
6789
6790         msrs->entry_ctls_high = vmcs_conf->vmentry_ctrl;
6791         msrs->entry_ctls_high &=
6792 #ifdef CONFIG_X86_64
6793                 VM_ENTRY_IA32E_MODE |
6794 #endif
6795                 VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_LOAD_BNDCFGS;
6796         msrs->entry_ctls_high |=
6797                 (VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR | VM_ENTRY_LOAD_IA32_EFER |
6798                  VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL);
6799
6800         /* We support free control of debug control loading. */
6801         msrs->entry_ctls_low &= ~VM_ENTRY_LOAD_DEBUG_CONTROLS;
6802
6803         /* cpu-based controls */
6804         msrs->procbased_ctls_low =
6805                 CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
6806
6807         msrs->procbased_ctls_high = vmcs_conf->cpu_based_exec_ctrl;
6808         msrs->procbased_ctls_high &=
6809                 CPU_BASED_INTR_WINDOW_EXITING |
6810                 CPU_BASED_NMI_WINDOW_EXITING | CPU_BASED_USE_TSC_OFFSETTING |
6811                 CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
6812                 CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
6813                 CPU_BASED_CR3_STORE_EXITING |
6814 #ifdef CONFIG_X86_64
6815                 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
6816 #endif
6817                 CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
6818                 CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_TRAP_FLAG |
6819                 CPU_BASED_MONITOR_EXITING | CPU_BASED_RDPMC_EXITING |
6820                 CPU_BASED_RDTSC_EXITING | CPU_BASED_PAUSE_EXITING |
6821                 CPU_BASED_TPR_SHADOW | CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
6822         /*
6823          * We can allow some features even when not supported by the
6824          * hardware. For example, L1 can specify an MSR bitmap - and we
6825          * can use it to avoid exits to L1 - even when L0 runs L2
6826          * without MSR bitmaps.
6827          */
6828         msrs->procbased_ctls_high |=
6829                 CPU_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
6830                 CPU_BASED_USE_MSR_BITMAPS;
6831
6832         /* We support free control of CR3 access interception. */
6833         msrs->procbased_ctls_low &=
6834                 ~(CPU_BASED_CR3_LOAD_EXITING | CPU_BASED_CR3_STORE_EXITING);
6835
6836         /*
6837          * secondary cpu-based controls.  Do not include those that
6838          * depend on CPUID bits, they are added later by
6839          * vmx_vcpu_after_set_cpuid.
6840          */
6841         msrs->secondary_ctls_low = 0;
6842
6843         msrs->secondary_ctls_high = vmcs_conf->cpu_based_2nd_exec_ctrl;
6844         msrs->secondary_ctls_high &=
6845                 SECONDARY_EXEC_DESC |
6846                 SECONDARY_EXEC_ENABLE_RDTSCP |
6847                 SECONDARY_EXEC_VIRTUALIZE_X2APIC_MODE |
6848                 SECONDARY_EXEC_WBINVD_EXITING |
6849                 SECONDARY_EXEC_APIC_REGISTER_VIRT |
6850                 SECONDARY_EXEC_VIRTUAL_INTR_DELIVERY |
6851                 SECONDARY_EXEC_RDRAND_EXITING |
6852                 SECONDARY_EXEC_ENABLE_INVPCID |
6853                 SECONDARY_EXEC_RDSEED_EXITING |
6854                 SECONDARY_EXEC_XSAVES |
6855                 SECONDARY_EXEC_TSC_SCALING |
6856                 SECONDARY_EXEC_ENABLE_USR_WAIT_PAUSE;
6857
6858         /*
6859          * We can emulate "VMCS shadowing," even if the hardware
6860          * doesn't support it.
6861          */
6862         msrs->secondary_ctls_high |=
6863                 SECONDARY_EXEC_SHADOW_VMCS;
6864
6865         if (enable_ept) {
6866                 /* nested EPT: emulate EPT also to L1 */
6867                 msrs->secondary_ctls_high |=
6868                         SECONDARY_EXEC_ENABLE_EPT;
6869                 msrs->ept_caps =
6870                         VMX_EPT_PAGE_WALK_4_BIT |
6871                         VMX_EPT_PAGE_WALK_5_BIT |
6872                         VMX_EPTP_WB_BIT |
6873                         VMX_EPT_INVEPT_BIT |
6874                         VMX_EPT_EXECUTE_ONLY_BIT;
6875
6876                 msrs->ept_caps &= ept_caps;
6877                 msrs->ept_caps |= VMX_EPT_EXTENT_GLOBAL_BIT |
6878                         VMX_EPT_EXTENT_CONTEXT_BIT | VMX_EPT_2MB_PAGE_BIT |
6879                         VMX_EPT_1GB_PAGE_BIT;
6880                 if (enable_ept_ad_bits) {
6881                         msrs->secondary_ctls_high |=
6882                                 SECONDARY_EXEC_ENABLE_PML;
6883                         msrs->ept_caps |= VMX_EPT_AD_BIT;
6884                 }
6885         }
6886
6887         if (cpu_has_vmx_vmfunc()) {
6888                 msrs->secondary_ctls_high |=
6889                         SECONDARY_EXEC_ENABLE_VMFUNC;
6890                 /*
6891                  * Advertise EPTP switching unconditionally
6892                  * since we emulate it
6893                  */
6894                 if (enable_ept)
6895                         msrs->vmfunc_controls =
6896                                 VMX_VMFUNC_EPTP_SWITCHING;
6897         }
6898
6899         /*
6900          * Old versions of KVM use the single-context version without
6901          * checking for support, so declare that it is supported even
6902          * though it is treated as global context.  The alternative is
6903          * not failing the single-context invvpid, and it is worse.
6904          */
6905         if (enable_vpid) {
6906                 msrs->secondary_ctls_high |=
6907                         SECONDARY_EXEC_ENABLE_VPID;
6908                 msrs->vpid_caps = VMX_VPID_INVVPID_BIT |
6909                         VMX_VPID_EXTENT_SUPPORTED_MASK;
6910         }
6911
6912         if (enable_unrestricted_guest)
6913                 msrs->secondary_ctls_high |=
6914                         SECONDARY_EXEC_UNRESTRICTED_GUEST;
6915
6916         if (flexpriority_enabled)
6917                 msrs->secondary_ctls_high |=
6918                         SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
6919
6920         if (enable_sgx)
6921                 msrs->secondary_ctls_high |= SECONDARY_EXEC_ENCLS_EXITING;
6922
6923         /* miscellaneous data */
6924         msrs->misc_low = (u32)vmcs_conf->misc & VMX_MISC_SAVE_EFER_LMA;
6925         msrs->misc_low |=
6926                 MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS |
6927                 VMX_MISC_EMULATED_PREEMPTION_TIMER_RATE |
6928                 VMX_MISC_ACTIVITY_HLT |
6929                 VMX_MISC_ACTIVITY_WAIT_SIPI;
6930         msrs->misc_high = 0;
6931
6932         /*
6933          * This MSR reports some information about VMX support. We
6934          * should return information about the VMX we emulate for the
6935          * guest, and the VMCS structure we give it - not about the
6936          * VMX support of the underlying hardware.
6937          */
6938         msrs->basic =
6939                 VMCS12_REVISION |
6940                 VMX_BASIC_TRUE_CTLS |
6941                 ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
6942                 (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
6943
6944         if (cpu_has_vmx_basic_inout())
6945                 msrs->basic |= VMX_BASIC_INOUT;
6946
6947         /*
6948          * These MSRs specify bits which the guest must keep fixed on
6949          * while L1 is in VMXON mode (in L1's root mode, or running an L2).
6950          * We picked the standard core2 setting.
6951          */
6952 #define VMXON_CR0_ALWAYSON     (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
6953 #define VMXON_CR4_ALWAYSON     X86_CR4_VMXE
6954         msrs->cr0_fixed0 = VMXON_CR0_ALWAYSON;
6955         msrs->cr4_fixed0 = VMXON_CR4_ALWAYSON;
6956
6957         /* These MSRs specify bits which the guest must keep fixed off. */
6958         rdmsrl(MSR_IA32_VMX_CR0_FIXED1, msrs->cr0_fixed1);
6959         rdmsrl(MSR_IA32_VMX_CR4_FIXED1, msrs->cr4_fixed1);
6960
6961         if (vmx_umip_emulated())
6962                 msrs->cr4_fixed1 |= X86_CR4_UMIP;
6963
6964         msrs->vmcs_enum = nested_vmx_calc_vmcs_enum_msr();
6965 }
6966
6967 void nested_vmx_hardware_unsetup(void)
6968 {
6969         int i;
6970
6971         if (enable_shadow_vmcs) {
6972                 for (i = 0; i < VMX_BITMAP_NR; i++)
6973                         free_page((unsigned long)vmx_bitmap[i]);
6974         }
6975 }
6976
6977 __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
6978 {
6979         int i;
6980
6981         if (!cpu_has_vmx_shadow_vmcs())
6982                 enable_shadow_vmcs = 0;
6983         if (enable_shadow_vmcs) {
6984                 for (i = 0; i < VMX_BITMAP_NR; i++) {
6985                         /*
6986                          * The vmx_bitmap is not tied to a VM and so should
6987                          * not be charged to a memcg.
6988                          */
6989                         vmx_bitmap[i] = (unsigned long *)
6990                                 __get_free_page(GFP_KERNEL);
6991                         if (!vmx_bitmap[i]) {
6992                                 nested_vmx_hardware_unsetup();
6993                                 return -ENOMEM;
6994                         }
6995                 }
6996
6997                 init_vmcs_shadow_fields();
6998         }
6999
7000         exit_handlers[EXIT_REASON_VMCLEAR]      = handle_vmclear;
7001         exit_handlers[EXIT_REASON_VMLAUNCH]     = handle_vmlaunch;
7002         exit_handlers[EXIT_REASON_VMPTRLD]      = handle_vmptrld;
7003         exit_handlers[EXIT_REASON_VMPTRST]      = handle_vmptrst;
7004         exit_handlers[EXIT_REASON_VMREAD]       = handle_vmread;
7005         exit_handlers[EXIT_REASON_VMRESUME]     = handle_vmresume;
7006         exit_handlers[EXIT_REASON_VMWRITE]      = handle_vmwrite;
7007         exit_handlers[EXIT_REASON_VMOFF]        = handle_vmxoff;
7008         exit_handlers[EXIT_REASON_VMON]         = handle_vmxon;
7009         exit_handlers[EXIT_REASON_INVEPT]       = handle_invept;
7010         exit_handlers[EXIT_REASON_INVVPID]      = handle_invvpid;
7011         exit_handlers[EXIT_REASON_VMFUNC]       = handle_vmfunc;
7012
7013         return 0;
7014 }
7015
7016 struct kvm_x86_nested_ops vmx_nested_ops = {
7017         .leave_nested = vmx_leave_nested,
7018         .is_exception_vmexit = nested_vmx_is_exception_vmexit,
7019         .check_events = vmx_check_nested_events,
7020         .has_events = vmx_has_nested_events,
7021         .triple_fault = nested_vmx_triple_fault,
7022         .get_state = vmx_get_nested_state,
7023         .set_state = vmx_set_nested_state,
7024         .get_nested_state_pages = vmx_get_nested_state_pages,
7025         .write_log_dirty = nested_vmx_write_pml_buffer,
7026         .enable_evmcs = nested_enable_evmcs,
7027         .get_evmcs_version = nested_get_evmcs_version,
7028 };