arch/arm/include/asm/kvm_host.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   4  * Author: Christoffer Dall <c.dall@virtualopensystems.com>
   5  */
   6
   7 #ifndef __ARM_KVM_HOST_H__
   8 #define __ARM_KVM_HOST_H__
   9
  10 #include <linux/errno.h>
  11 #include <linux/types.h>
  12 #include <linux/kvm_types.h>
  13 #include <asm/cputype.h>
  14 #include <asm/kvm.h>
  15 #include <asm/kvm_asm.h>
  16 #include <asm/kvm_mmio.h>
  17 #include <asm/fpstate.h>
  18 #include <asm/spectre.h>
  19 #include <kvm/arm_arch_timer.h>
  20
  21 #define __KVM_HAVE_ARCH_INTC_INITIALIZED
  22
  23 #define KVM_USER_MEM_SLOTS 32
  24 #define KVM_HAVE_ONE_REG
  25 #define KVM_HALT_POLL_NS_DEFAULT 500000
  26
  27 #define KVM_VCPU_MAX_FEATURES 2
  28
  29 #include <kvm/arm_vgic.h>
  30
  31
  32 #ifdef CONFIG_ARM_GIC_V3
  33 #define KVM_MAX_VCPUS VGIC_V3_MAX_CPUS
  34 #else
  35 #define KVM_MAX_VCPUS VGIC_V2_MAX_CPUS
  36 #endif
  37
  38 #define KVM_REQ_SLEEP \
  39         KVM_ARCH_REQ_FLAGS(0, KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
  40 #define KVM_REQ_IRQ_PENDING     KVM_ARCH_REQ(1)
  41 #define KVM_REQ_VCPU_RESET      KVM_ARCH_REQ(2)
  42
  43 DECLARE_STATIC_KEY_FALSE(userspace_irqchip_in_use);
  44
  45 static inline int kvm_arm_init_sve(void) { return 0; }
  46
  47 u32 *kvm_vcpu_reg(struct kvm_vcpu *vcpu, u8 reg_num, u32 mode);
  48 int __attribute_const__ kvm_target_cpu(void);
  49 int kvm_reset_vcpu(struct kvm_vcpu *vcpu);
  50 void kvm_reset_coprocs(struct kvm_vcpu *vcpu);
  51
  52 struct kvm_vmid {
  53         /* The VMID generation used for the virt. memory system */
  54         u64    vmid_gen;
  55         u32    vmid;
  56 };
  57
  58 struct kvm_arch {
  59         /* The last vcpu id that ran on each physical CPU */
  60         int __percpu *last_vcpu_ran;
  61
  62         /*
  63          * Anything that is not used directly from assembly code goes
  64          * here.
  65          */
  66
  67         /* The VMID generation used for the virt. memory system */
  68         struct kvm_vmid vmid;
  69
  70         /* Stage-2 page table */
  71         pgd_t *pgd;
  72         phys_addr_t pgd_phys;
  73
  74         /* Interrupt controller */
  75         struct vgic_dist        vgic;
  76         int max_vcpus;
  77
  78         /* Mandated version of PSCI */
  79         u32 psci_version;
  80 };
  81
  82 #define KVM_NR_MEM_OBJS     40
  83
  84 /*
  85  * We don't want allocation failures within the mmu code, so we preallocate
  86  * enough memory for a single page fault in a cache.
  87  */
  88 struct kvm_mmu_memory_cache {
  89         int nobjs;
  90         void *objects[KVM_NR_MEM_OBJS];
  91 };
  92
  93 struct kvm_vcpu_fault_info {
  94         u32 hsr;                /* Hyp Syndrome Register */
  95         u32 hxfar;              /* Hyp Data/Inst. Fault Address Register */
  96         u32 hpfar;              /* Hyp IPA Fault Address Register */
  97 };
  98
  99 /*
 100  * 0 is reserved as an invalid value.
 101  * Order should be kept in sync with the save/restore code.
 102  */
 103 enum vcpu_sysreg {
 104         __INVALID_SYSREG__,
 105         c0_MPIDR,               /* MultiProcessor ID Register */
 106         c0_CSSELR,              /* Cache Size Selection Register */
 107         c1_SCTLR,               /* System Control Register */
 108         c1_ACTLR,               /* Auxiliary Control Register */
 109         c1_CPACR,               /* Coprocessor Access Control */
 110         c2_TTBR0,               /* Translation Table Base Register 0 */
 111         c2_TTBR0_high,          /* TTBR0 top 32 bits */
 112         c2_TTBR1,               /* Translation Table Base Register 1 */
 113         c2_TTBR1_high,          /* TTBR1 top 32 bits */
 114         c2_TTBCR,               /* Translation Table Base Control R. */
 115         c3_DACR,                /* Domain Access Control Register */
 116         c5_DFSR,                /* Data Fault Status Register */
 117         c5_IFSR,                /* Instruction Fault Status Register */
 118         c5_ADFSR,               /* Auxilary Data Fault Status R */
 119         c5_AIFSR,               /* Auxilary Instrunction Fault Status R */
 120         c6_DFAR,                /* Data Fault Address Register */
 121         c6_IFAR,                /* Instruction Fault Address Register */
 122         c7_PAR,                 /* Physical Address Register */
 123         c7_PAR_high,            /* PAR top 32 bits */
 124         c9_L2CTLR,              /* Cortex A15/A7 L2 Control Register */
 125         c10_PRRR,               /* Primary Region Remap Register */
 126         c10_NMRR,               /* Normal Memory Remap Register */
 127         c12_VBAR,               /* Vector Base Address Register */
 128         c13_CID,                /* Context ID Register */
 129         c13_TID_URW,            /* Thread ID, User R/W */
 130         c13_TID_URO,            /* Thread ID, User R/O */
 131         c13_TID_PRIV,           /* Thread ID, Privileged */
 132         c14_CNTKCTL,            /* Timer Control Register (PL1) */
 133         c10_AMAIR0,             /* Auxilary Memory Attribute Indirection Reg0 */
 134         c10_AMAIR1,             /* Auxilary Memory Attribute Indirection Reg1 */
 135         NR_CP15_REGS            /* Number of regs (incl. invalid) */
 136 };
 137
 138 struct kvm_cpu_context {
 139         struct kvm_regs gp_regs;
 140         struct vfp_hard_struct vfp;
 141         u32 cp15[NR_CP15_REGS];
 142 };
 143
 144 struct kvm_host_data {
 145         struct kvm_cpu_context host_ctxt;
 146 };
 147
 148 typedef struct kvm_host_data kvm_host_data_t;
 149
 150 static inline void kvm_init_host_cpu_context(struct kvm_cpu_context *cpu_ctxt)
 151 {
 152         /* The host's MPIDR is immutable, so let's set it up at boot time */
 153         cpu_ctxt->cp15[c0_MPIDR] = read_cpuid_mpidr();
 154 }
 155
 156 struct vcpu_reset_state {
 157         unsigned long   pc;
 158         unsigned long   r0;
 159         bool            be;
 160         bool            reset;
 161 };
 162
 163 struct kvm_vcpu_arch {
 164         struct kvm_cpu_context ctxt;
 165
 166         int target; /* Processor target */
 167         DECLARE_BITMAP(features, KVM_VCPU_MAX_FEATURES);
 168
 169         /* The CPU type we expose to the VM */
 170         u32 midr;
 171
 172         /* HYP trapping configuration */
 173         u32 hcr;
 174
 175         /* Exception Information */
 176         struct kvm_vcpu_fault_info fault;
 177
 178         /* Host FP context */
 179         struct kvm_cpu_context *host_cpu_context;
 180
 181         /* VGIC state */
 182         struct vgic_cpu vgic_cpu;
 183         struct arch_timer_cpu timer_cpu;
 184
 185         /*
 186          * Anything that is not used directly from assembly code goes
 187          * here.
 188          */
 189
 190         /* vcpu power-off state */
 191         bool power_off;
 192
 193          /* Don't run the guest (internal implementation need) */
 194         bool pause;
 195
 196         /* IO related fields */
 197         struct kvm_decode mmio_decode;
 198
 199         /* Cache some mmu pages needed inside spinlock regions */
 200         struct kvm_mmu_memory_cache mmu_page_cache;
 201
 202         struct vcpu_reset_state reset_state;
 203
 204         /* Detect first run of a vcpu */
 205         bool has_run_once;
 206 };
 207
 208 struct kvm_vm_stat {
 209         ulong remote_tlb_flush;
 210 };
 211
 212 struct kvm_vcpu_stat {
 213         u64 halt_successful_poll;
 214         u64 halt_attempted_poll;
 215         u64 halt_poll_invalid;
 216         u64 halt_wakeup;
 217         u64 hvc_exit_stat;
 218         u64 wfe_exit_stat;
 219         u64 wfi_exit_stat;
 220         u64 mmio_exit_user;
 221         u64 mmio_exit_kernel;
 222         u64 exits;
 223 };
 224
 225 #define vcpu_cp15(v,r)  (v)->arch.ctxt.cp15[r]
 226
 227 int kvm_vcpu_preferred_target(struct kvm_vcpu_init *init);
 228 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 229 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 230 int kvm_arm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 231 int kvm_arm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg);
 232
 233 unsigned long __kvm_call_hyp(void *hypfn, ...);
 234
 235 /*
 236  * The has_vhe() part doesn't get emitted, but is used for type-checking.
 237  */
 238 #define kvm_call_hyp(f, ...)                                            \
 239         do {                                                            \
 240                 if (has_vhe()) {                                        \
 241                         f(__VA_ARGS__);                                 \
 242                 } else {                                                \
 243                         __kvm_call_hyp(kvm_ksym_ref(f), ##__VA_ARGS__); \
 244                 }                                                       \
 245         } while(0)
 246
 247 #define kvm_call_hyp_ret(f, ...)                                        \
 248         ({                                                              \
 249                 typeof(f(__VA_ARGS__)) ret;                             \
 250                                                                         \
 251                 if (has_vhe()) {                                        \
 252                         ret = f(__VA_ARGS__);                           \
 253                 } else {                                                \
 254                         ret = __kvm_call_hyp(kvm_ksym_ref(f),           \
 255                                              ##__VA_ARGS__);            \
 256                 }                                                       \
 257                                                                         \
 258                 ret;                                                    \
 259         })
 260
 261 void force_vm_exit(const cpumask_t *mask);
 262 int __kvm_arm_vcpu_get_events(struct kvm_vcpu *vcpu,
 263                               struct kvm_vcpu_events *events);
 264
 265 int __kvm_arm_vcpu_set_events(struct kvm_vcpu *vcpu,
 266                               struct kvm_vcpu_events *events);
 267
 268 #define KVM_ARCH_WANT_MMU_NOTIFIER
 269 int kvm_unmap_hva_range(struct kvm *kvm,
 270                         unsigned long start, unsigned long end, unsigned flags);
 271 int kvm_set_spte_hva(struct kvm *kvm, unsigned long hva, pte_t pte);
 272
 273 unsigned long kvm_arm_num_regs(struct kvm_vcpu *vcpu);
 274 int kvm_arm_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices);
 275 int kvm_age_hva(struct kvm *kvm, unsigned long start, unsigned long end);
 276 int kvm_test_age_hva(struct kvm *kvm, unsigned long hva);
 277
 278 struct kvm_vcpu *kvm_arm_get_running_vcpu(void);
 279 struct kvm_vcpu __percpu **kvm_get_running_vcpus(void);
 280 void kvm_arm_halt_guest(struct kvm *kvm);
 281 void kvm_arm_resume_guest(struct kvm *kvm);
 282
 283 int kvm_arm_copy_coproc_indices(struct kvm_vcpu *vcpu, u64 __user *uindices);
 284 unsigned long kvm_arm_num_coproc_regs(struct kvm_vcpu *vcpu);
 285 int kvm_arm_coproc_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 286 int kvm_arm_coproc_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *);
 287
 288 int handle_exit(struct kvm_vcpu *vcpu, struct kvm_run *run,
 289                 int exception_index);
 290
 291 static inline void handle_exit_early(struct kvm_vcpu *vcpu, struct kvm_run *run,
 292                                      int exception_index) {}
 293
 294 static inline void __cpu_init_hyp_mode(phys_addr_t pgd_ptr,
 295                                        unsigned long hyp_stack_ptr,
 296                                        unsigned long vector_ptr)
 297 {
 298         /*
 299          * Call initialization code, and switch to the full blown HYP
 300          * code. The init code doesn't need to preserve these
 301          * registers as r0-r3 are already callee saved according to
 302          * the AAPCS.
 303          * Note that we slightly misuse the prototype by casting the
 304          * stack pointer to a void *.
 305
 306          * The PGDs are always passed as the third argument, in order
 307          * to be passed into r2-r3 to the init code (yes, this is
 308          * compliant with the PCS!).
 309          */
 310
 311         __kvm_call_hyp((void*)hyp_stack_ptr, vector_ptr, pgd_ptr);
 312 }
 313
 314 static inline void __cpu_init_stage2(void)
 315 {
 316         kvm_call_hyp(__init_stage2_translation);
 317 }
 318
 319 static inline int kvm_arch_vm_ioctl_check_extension(struct kvm *kvm, long ext)
 320 {
 321         return 0;
 322 }
 323
 324 int kvm_perf_init(void);
 325 int kvm_perf_teardown(void);
 326
 327 void kvm_mmu_wp_memory_region(struct kvm *kvm, int slot);
 328
 329 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr);
 330
 331 static inline bool kvm_arch_requires_vhe(void) { return false; }
 332 static inline void kvm_arch_hardware_unsetup(void) {}
 333 static inline void kvm_arch_sync_events(struct kvm *kvm) {}
 334 static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
 335 static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
 336 static inline void kvm_arch_vcpu_block_finish(struct kvm_vcpu *vcpu) {}
 337
 338 static inline void kvm_arm_init_debug(void) {}
 339 static inline void kvm_arm_vcpu_init_debug(struct kvm_vcpu *vcpu) {}
 340 static inline void kvm_arm_setup_debug(struct kvm_vcpu *vcpu) {}
 341 static inline void kvm_arm_clear_debug(struct kvm_vcpu *vcpu) {}
 342 static inline void kvm_arm_reset_debug_ptr(struct kvm_vcpu *vcpu) {}
 343
 344 int kvm_arm_vcpu_arch_set_attr(struct kvm_vcpu *vcpu,
 345                                struct kvm_device_attr *attr);
 346 int kvm_arm_vcpu_arch_get_attr(struct kvm_vcpu *vcpu,
 347                                struct kvm_device_attr *attr);
 348 int kvm_arm_vcpu_arch_has_attr(struct kvm_vcpu *vcpu,
 349                                struct kvm_device_attr *attr);
 350
 351 /*
 352  * VFP/NEON switching is all done by the hyp switch code, so no need to
 353  * coordinate with host context handling for this state:
 354  */
 355 static inline void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) {}
 356 static inline void kvm_arch_vcpu_ctxsync_fp(struct kvm_vcpu *vcpu) {}
 357 static inline void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) {}
 358
 359 static inline void kvm_vcpu_pmu_restore_guest(struct kvm_vcpu *vcpu) {}
 360 static inline void kvm_vcpu_pmu_restore_host(struct kvm_vcpu *vcpu) {}
 361
 362 static inline void kvm_arm_vhe_guest_enter(void) {}
 363 static inline void kvm_arm_vhe_guest_exit(void) {}
 364
 365 #define KVM_BP_HARDEN_UNKNOWN           -1
 366 #define KVM_BP_HARDEN_WA_NEEDED         0
 367 #define KVM_BP_HARDEN_NOT_REQUIRED      1
 368
 369 static inline int kvm_arm_harden_branch_predictor(void)
 370 {
 371         switch(read_cpuid_part()) {
 372 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
 373         case ARM_CPU_PART_BRAHMA_B15:
 374         case ARM_CPU_PART_CORTEX_A12:
 375         case ARM_CPU_PART_CORTEX_A15:
 376         case ARM_CPU_PART_CORTEX_A17:
 377                 return KVM_BP_HARDEN_WA_NEEDED;
 378 #endif
 379         case ARM_CPU_PART_CORTEX_A7:
 380                 return KVM_BP_HARDEN_NOT_REQUIRED;
 381         default:
 382                 return KVM_BP_HARDEN_UNKNOWN;
 383         }
 384 }
 385
 386 #define KVM_SSBD_UNKNOWN                -1
 387 #define KVM_SSBD_FORCE_DISABLE          0
 388 #define KVM_SSBD_KERNEL         1
 389 #define KVM_SSBD_FORCE_ENABLE           2
 390 #define KVM_SSBD_MITIGATED              3
 391
 392 static inline int kvm_arm_have_ssbd(void)
 393 {
 394         /* No way to detect it yet, pretend it is not there. */
 395         return KVM_SSBD_UNKNOWN;
 396 }
 397
 398 static inline void kvm_vcpu_load_sysregs(struct kvm_vcpu *vcpu) {}
 399 static inline void kvm_vcpu_put_sysregs(struct kvm_vcpu *vcpu) {}
 400
 401 #define __KVM_HAVE_ARCH_VM_ALLOC
 402 struct kvm *kvm_arch_alloc_vm(void);
 403 void kvm_arch_free_vm(struct kvm *kvm);
 404
 405 static inline int kvm_arm_setup_stage2(struct kvm *kvm, unsigned long type)
 406 {
 407         /*
 408          * On 32bit ARM, VMs get a static 40bit IPA stage2 setup,
 409          * so any non-zero value used as type is illegal.
 410          */
 411         if (type)
 412                 return -EINVAL;
 413         return 0;
 414 }
 415
 416 static inline int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
 417 {
 418         return -EINVAL;
 419 }
 420
 421 static inline bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
 422 {
 423         return true;
 424 }
 425
 426 #define kvm_arm_vcpu_loaded(vcpu)       (false)
 427
 428 static inline int kvm_arm_get_spectre_bhb_state(void)
 429 {
 430         /* 32bit guests don't need firmware for this */
 431         return SPECTRE_VULNERABLE; /* aka SMCCC_RET_NOT_SUPPORTED */
 432 }
 433
 434 #endif /* __ARM_KVM_HOST_H__ */