2 * Kernel-based Virtual Machine driver for Linux
4 * derived from drivers/kvm/kvm_main.c
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright (C) 2008 Qumranet, Inc.
8 * Copyright IBM Corporation, 2008
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
14 * Amit Shah <amit.shah@qumranet.com>
15 * Ben-Ami Yassour <benami@il.ibm.com>
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
22 #include <linux/kvm_host.h>
27 #include "kvm_cache_regs.h"
33 #include <linux/clocksource.h>
34 #include <linux/interrupt.h>
35 #include <linux/kvm.h>
37 #include <linux/vmalloc.h>
38 #include <linux/export.h>
39 #include <linux/moduleparam.h>
40 #include <linux/mman.h>
41 #include <linux/highmem.h>
42 #include <linux/iommu.h>
43 #include <linux/intel-iommu.h>
44 #include <linux/cpufreq.h>
45 #include <linux/user-return-notifier.h>
46 #include <linux/srcu.h>
47 #include <linux/slab.h>
48 #include <linux/perf_event.h>
49 #include <linux/uaccess.h>
50 #include <linux/hash.h>
51 #include <linux/pci.h>
52 #include <linux/timekeeper_internal.h>
53 #include <linux/pvclock_gtod.h>
54 #include <linux/kvm_irqfd.h>
55 #include <linux/irqbypass.h>
56 #include <linux/sched/stat.h>
57 #include <linux/mem_encrypt.h>
59 #include <trace/events/kvm.h>
61 #include <asm/debugreg.h>
65 #include <linux/kernel_stat.h>
66 #include <asm/fpu/internal.h> /* Ugh! */
67 #include <asm/pvclock.h>
68 #include <asm/div64.h>
69 #include <asm/irq_remapping.h>
71 #define CREATE_TRACE_POINTS
74 #define MAX_IO_MSRS 256
75 #define KVM_MAX_MCE_BANKS 32
76 u64 __read_mostly kvm_mce_cap_supported = MCG_CTL_P | MCG_SER_P;
77 EXPORT_SYMBOL_GPL(kvm_mce_cap_supported);
79 #define emul_to_vcpu(ctxt) \
80 container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
83 * - enable syscall per default because its emulated by KVM
84 * - enable LME and LMA per default on 64 bit KVM
88 u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
90 static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
93 #define VM_STAT(x, ...) offsetof(struct kvm, stat.x), KVM_STAT_VM, ## __VA_ARGS__
94 #define VCPU_STAT(x, ...) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU, ## __VA_ARGS__
96 #define KVM_X2APIC_API_VALID_FLAGS (KVM_X2APIC_API_USE_32BIT_IDS | \
97 KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK)
99 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
100 static void process_nmi(struct kvm_vcpu *vcpu);
101 static void process_smi(struct kvm_vcpu *vcpu);
102 static void enter_smm(struct kvm_vcpu *vcpu);
103 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
105 struct kvm_x86_ops *kvm_x86_ops __read_mostly;
106 EXPORT_SYMBOL_GPL(kvm_x86_ops);
108 static bool __read_mostly ignore_msrs = 0;
109 module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
111 unsigned int min_timer_period_us = 500;
112 module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
114 static bool __read_mostly kvmclock_periodic_sync = true;
115 module_param(kvmclock_periodic_sync, bool, S_IRUGO);
117 bool __read_mostly kvm_has_tsc_control;
118 EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
119 u32 __read_mostly kvm_max_guest_tsc_khz;
120 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
121 u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits;
122 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits);
123 u64 __read_mostly kvm_max_tsc_scaling_ratio;
124 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio);
125 u64 __read_mostly kvm_default_tsc_scaling_ratio;
126 EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio);
128 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
129 static u32 __read_mostly tsc_tolerance_ppm = 250;
130 module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
132 /* lapic timer advance (tscdeadline mode only) in nanoseconds */
133 unsigned int __read_mostly lapic_timer_advance_ns = 0;
134 module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR);
136 static bool __read_mostly vector_hashing = true;
137 module_param(vector_hashing, bool, S_IRUGO);
139 #define KVM_NR_SHARED_MSRS 16
141 struct kvm_shared_msrs_global {
143 u32 msrs[KVM_NR_SHARED_MSRS];
146 struct kvm_shared_msrs {
147 struct user_return_notifier urn;
149 struct kvm_shared_msr_values {
152 } values[KVM_NR_SHARED_MSRS];
155 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
156 static struct kvm_shared_msrs __percpu *shared_msrs;
158 struct kvm_stats_debugfs_item debugfs_entries[] = {
159 { "pf_fixed", VCPU_STAT(pf_fixed) },
160 { "pf_guest", VCPU_STAT(pf_guest) },
161 { "tlb_flush", VCPU_STAT(tlb_flush) },
162 { "invlpg", VCPU_STAT(invlpg) },
163 { "exits", VCPU_STAT(exits) },
164 { "io_exits", VCPU_STAT(io_exits) },
165 { "mmio_exits", VCPU_STAT(mmio_exits) },
166 { "signal_exits", VCPU_STAT(signal_exits) },
167 { "irq_window", VCPU_STAT(irq_window_exits) },
168 { "nmi_window", VCPU_STAT(nmi_window_exits) },
169 { "halt_exits", VCPU_STAT(halt_exits) },
170 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
171 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll) },
172 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid) },
173 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
174 { "hypercalls", VCPU_STAT(hypercalls) },
175 { "request_irq", VCPU_STAT(request_irq_exits) },
176 { "irq_exits", VCPU_STAT(irq_exits) },
177 { "host_state_reload", VCPU_STAT(host_state_reload) },
178 { "efer_reload", VCPU_STAT(efer_reload) },
179 { "fpu_reload", VCPU_STAT(fpu_reload) },
180 { "insn_emulation", VCPU_STAT(insn_emulation) },
181 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
182 { "irq_injections", VCPU_STAT(irq_injections) },
183 { "nmi_injections", VCPU_STAT(nmi_injections) },
184 { "req_event", VCPU_STAT(req_event) },
185 { "l1d_flush", VCPU_STAT(l1d_flush) },
186 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
187 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
188 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
189 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
190 { "mmu_flooded", VM_STAT(mmu_flooded) },
191 { "mmu_recycled", VM_STAT(mmu_recycled) },
192 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
193 { "mmu_unsync", VM_STAT(mmu_unsync) },
194 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
195 { "largepages", VM_STAT(lpages, .mode = 0444) },
196 { "nx_largepages_splitted", VM_STAT(nx_lpage_splits, .mode = 0444) },
197 { "max_mmu_page_hash_collisions",
198 VM_STAT(max_mmu_page_hash_collisions) },
202 u64 __read_mostly host_xcr0;
204 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
206 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
209 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
210 vcpu->arch.apf.gfns[i] = ~0;
213 static void kvm_on_user_return(struct user_return_notifier *urn)
216 struct kvm_shared_msrs *locals
217 = container_of(urn, struct kvm_shared_msrs, urn);
218 struct kvm_shared_msr_values *values;
222 * Disabling irqs at this point since the following code could be
223 * interrupted and executed through kvm_arch_hardware_disable()
225 local_irq_save(flags);
226 if (locals->registered) {
227 locals->registered = false;
228 user_return_notifier_unregister(urn);
230 local_irq_restore(flags);
231 for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
232 values = &locals->values[slot];
233 if (values->host != values->curr) {
234 wrmsrl(shared_msrs_global.msrs[slot], values->host);
235 values->curr = values->host;
240 static void shared_msr_update(unsigned slot, u32 msr)
243 unsigned int cpu = smp_processor_id();
244 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
246 /* only read, and nobody should modify it at this time,
247 * so don't need lock */
248 if (slot >= shared_msrs_global.nr) {
249 printk(KERN_ERR "kvm: invalid MSR slot!");
252 rdmsrl_safe(msr, &value);
253 smsr->values[slot].host = value;
254 smsr->values[slot].curr = value;
257 void kvm_define_shared_msr(unsigned slot, u32 msr)
259 BUG_ON(slot >= KVM_NR_SHARED_MSRS);
260 shared_msrs_global.msrs[slot] = msr;
261 if (slot >= shared_msrs_global.nr)
262 shared_msrs_global.nr = slot + 1;
264 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
266 static void kvm_shared_msr_cpu_online(void)
270 for (i = 0; i < shared_msrs_global.nr; ++i)
271 shared_msr_update(i, shared_msrs_global.msrs[i]);
274 int kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
276 unsigned int cpu = smp_processor_id();
277 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
280 value = (value & mask) | (smsr->values[slot].host & ~mask);
281 if (value == smsr->values[slot].curr)
283 err = wrmsrl_safe(shared_msrs_global.msrs[slot], value);
287 smsr->values[slot].curr = value;
288 if (!smsr->registered) {
289 smsr->urn.on_user_return = kvm_on_user_return;
290 user_return_notifier_register(&smsr->urn);
291 smsr->registered = true;
295 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
297 static void drop_user_return_notifiers(void)
299 unsigned int cpu = smp_processor_id();
300 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
302 if (smsr->registered)
303 kvm_on_user_return(&smsr->urn);
306 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
308 return vcpu->arch.apic_base;
310 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
312 enum lapic_mode kvm_get_apic_mode(struct kvm_vcpu *vcpu)
314 return kvm_apic_mode(kvm_get_apic_base(vcpu));
316 EXPORT_SYMBOL_GPL(kvm_get_apic_mode);
318 int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
320 enum lapic_mode old_mode = kvm_get_apic_mode(vcpu);
321 enum lapic_mode new_mode = kvm_apic_mode(msr_info->data);
322 u64 reserved_bits = ((~0ULL) << cpuid_maxphyaddr(vcpu)) | 0x2ff |
323 (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC) ? 0 : X2APIC_ENABLE);
325 if ((msr_info->data & reserved_bits) != 0 || new_mode == LAPIC_MODE_INVALID)
327 if (!msr_info->host_initiated) {
328 if (old_mode == LAPIC_MODE_X2APIC && new_mode == LAPIC_MODE_XAPIC)
330 if (old_mode == LAPIC_MODE_DISABLED && new_mode == LAPIC_MODE_X2APIC)
334 kvm_lapic_set_base(vcpu, msr_info->data);
337 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
339 asmlinkage __visible void kvm_spurious_fault(void)
341 /* Fault while not rebooting. We want the trace. */
344 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
346 #define EXCPT_BENIGN 0
347 #define EXCPT_CONTRIBUTORY 1
350 static int exception_class(int vector)
360 return EXCPT_CONTRIBUTORY;
367 #define EXCPT_FAULT 0
369 #define EXCPT_ABORT 2
370 #define EXCPT_INTERRUPT 3
372 static int exception_type(int vector)
376 if (WARN_ON(vector > 31 || vector == NMI_VECTOR))
377 return EXCPT_INTERRUPT;
381 /* #DB is trap, as instruction watchpoints are handled elsewhere */
382 if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR)))
385 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR)))
388 /* Reserved exceptions will result in fault */
392 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
393 unsigned nr, bool has_error, u32 error_code,
399 kvm_make_request(KVM_REQ_EVENT, vcpu);
401 if (!vcpu->arch.exception.pending && !vcpu->arch.exception.injected) {
405 * On vmentry, vcpu->arch.exception.pending is only
406 * true if an event injection was blocked by
407 * nested_run_pending. In that case, however,
408 * vcpu_enter_guest requests an immediate exit,
409 * and the guest shouldn't proceed far enough to
412 WARN_ON_ONCE(vcpu->arch.exception.pending);
413 vcpu->arch.exception.injected = true;
415 vcpu->arch.exception.pending = true;
416 vcpu->arch.exception.injected = false;
418 vcpu->arch.exception.has_error_code = has_error;
419 vcpu->arch.exception.nr = nr;
420 vcpu->arch.exception.error_code = error_code;
424 /* to check exception */
425 prev_nr = vcpu->arch.exception.nr;
426 if (prev_nr == DF_VECTOR) {
427 /* triple fault -> shutdown */
428 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
431 class1 = exception_class(prev_nr);
432 class2 = exception_class(nr);
433 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
434 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
436 * Generate double fault per SDM Table 5-5. Set
437 * exception.pending = true so that the double fault
438 * can trigger a nested vmexit.
440 vcpu->arch.exception.pending = true;
441 vcpu->arch.exception.injected = false;
442 vcpu->arch.exception.has_error_code = true;
443 vcpu->arch.exception.nr = DF_VECTOR;
444 vcpu->arch.exception.error_code = 0;
446 /* replace previous exception with a new one in a hope
447 that instruction re-execution will regenerate lost
452 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
454 kvm_multiple_exception(vcpu, nr, false, 0, false);
456 EXPORT_SYMBOL_GPL(kvm_queue_exception);
458 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
460 kvm_multiple_exception(vcpu, nr, false, 0, true);
462 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
464 int kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
467 kvm_inject_gp(vcpu, 0);
469 return kvm_skip_emulated_instruction(vcpu);
473 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
475 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
477 ++vcpu->stat.pf_guest;
478 vcpu->arch.exception.nested_apf =
479 is_guest_mode(vcpu) && fault->async_page_fault;
480 if (vcpu->arch.exception.nested_apf)
481 vcpu->arch.apf.nested_apf_token = fault->address;
483 vcpu->arch.cr2 = fault->address;
484 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
486 EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
488 static bool kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
490 if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
491 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
493 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
495 return fault->nested_page_fault;
498 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
500 atomic_inc(&vcpu->arch.nmi_queued);
501 kvm_make_request(KVM_REQ_NMI, vcpu);
503 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
505 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
507 kvm_multiple_exception(vcpu, nr, true, error_code, false);
509 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
511 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
513 kvm_multiple_exception(vcpu, nr, true, error_code, true);
515 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
518 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
519 * a #GP and return false.
521 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
523 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
525 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
528 EXPORT_SYMBOL_GPL(kvm_require_cpl);
530 bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr)
532 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE))
535 kvm_queue_exception(vcpu, UD_VECTOR);
538 EXPORT_SYMBOL_GPL(kvm_require_dr);
541 * This function will be used to read from the physical memory of the currently
542 * running guest. The difference to kvm_vcpu_read_guest_page is that this function
543 * can read from guest physical or from the guest's guest physical memory.
545 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
546 gfn_t ngfn, void *data, int offset, int len,
549 struct x86_exception exception;
553 ngpa = gfn_to_gpa(ngfn);
554 real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception);
555 if (real_gfn == UNMAPPED_GVA)
558 real_gfn = gpa_to_gfn(real_gfn);
560 return kvm_vcpu_read_guest_page(vcpu, real_gfn, data, offset, len);
562 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
564 static int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
565 void *data, int offset, int len, u32 access)
567 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
568 data, offset, len, access);
571 static inline u64 pdptr_rsvd_bits(struct kvm_vcpu *vcpu)
573 return rsvd_bits(cpuid_maxphyaddr(vcpu), 63) | rsvd_bits(5, 8) |
578 * Load the pae pdptrs. Return 1 if they are all valid, 0 otherwise.
580 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
582 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
583 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
586 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
588 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
589 offset * sizeof(u64), sizeof(pdpte),
590 PFERR_USER_MASK|PFERR_WRITE_MASK);
595 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
596 if ((pdpte[i] & PT_PRESENT_MASK) &&
597 (pdpte[i] & pdptr_rsvd_bits(vcpu))) {
604 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
605 __set_bit(VCPU_EXREG_PDPTR,
606 (unsigned long *)&vcpu->arch.regs_avail);
607 __set_bit(VCPU_EXREG_PDPTR,
608 (unsigned long *)&vcpu->arch.regs_dirty);
613 EXPORT_SYMBOL_GPL(load_pdptrs);
615 bool pdptrs_changed(struct kvm_vcpu *vcpu)
617 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
623 if (!is_pae_paging(vcpu))
626 if (!test_bit(VCPU_EXREG_PDPTR,
627 (unsigned long *)&vcpu->arch.regs_avail))
630 gfn = (kvm_read_cr3(vcpu) & 0xffffffe0ul) >> PAGE_SHIFT;
631 offset = (kvm_read_cr3(vcpu) & 0xffffffe0ul) & (PAGE_SIZE - 1);
632 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
633 PFERR_USER_MASK | PFERR_WRITE_MASK);
636 changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
641 EXPORT_SYMBOL_GPL(pdptrs_changed);
643 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
645 unsigned long old_cr0 = kvm_read_cr0(vcpu);
646 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP;
651 if (cr0 & 0xffffffff00000000UL)
655 cr0 &= ~CR0_RESERVED_BITS;
657 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
660 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
663 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
665 if ((vcpu->arch.efer & EFER_LME)) {
670 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
675 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
680 if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
683 kvm_x86_ops->set_cr0(vcpu, cr0);
685 if ((cr0 ^ old_cr0) & X86_CR0_PG) {
686 kvm_clear_async_pf_completion_queue(vcpu);
687 kvm_async_pf_hash_reset(vcpu);
690 if ((cr0 ^ old_cr0) & update_bits)
691 kvm_mmu_reset_context(vcpu);
693 if (((cr0 ^ old_cr0) & X86_CR0_CD) &&
694 kvm_arch_has_noncoherent_dma(vcpu->kvm) &&
695 !kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_CD_NW_CLEARED))
696 kvm_zap_gfn_range(vcpu->kvm, 0, ~0ULL);
700 EXPORT_SYMBOL_GPL(kvm_set_cr0);
702 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
704 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
706 EXPORT_SYMBOL_GPL(kvm_lmsw);
708 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
710 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
711 !vcpu->guest_xcr0_loaded) {
712 /* kvm_set_xcr() also depends on this */
713 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
714 vcpu->guest_xcr0_loaded = 1;
718 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
720 if (vcpu->guest_xcr0_loaded) {
721 if (vcpu->arch.xcr0 != host_xcr0)
722 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
723 vcpu->guest_xcr0_loaded = 0;
727 static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
730 u64 old_xcr0 = vcpu->arch.xcr0;
733 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
734 if (index != XCR_XFEATURE_ENABLED_MASK)
736 if (!(xcr0 & XFEATURE_MASK_FP))
738 if ((xcr0 & XFEATURE_MASK_YMM) && !(xcr0 & XFEATURE_MASK_SSE))
742 * Do not allow the guest to set bits that we do not support
743 * saving. However, xcr0 bit 0 is always set, even if the
744 * emulated CPU does not support XSAVE (see fx_init).
746 valid_bits = vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FP;
747 if (xcr0 & ~valid_bits)
750 if ((!(xcr0 & XFEATURE_MASK_BNDREGS)) !=
751 (!(xcr0 & XFEATURE_MASK_BNDCSR)))
754 if (xcr0 & XFEATURE_MASK_AVX512) {
755 if (!(xcr0 & XFEATURE_MASK_YMM))
757 if ((xcr0 & XFEATURE_MASK_AVX512) != XFEATURE_MASK_AVX512)
760 vcpu->arch.xcr0 = xcr0;
762 if ((xcr0 ^ old_xcr0) & XFEATURE_MASK_EXTEND)
763 kvm_update_cpuid(vcpu);
767 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
769 if (kvm_x86_ops->get_cpl(vcpu) != 0 ||
770 __kvm_set_xcr(vcpu, index, xcr)) {
771 kvm_inject_gp(vcpu, 0);
776 EXPORT_SYMBOL_GPL(kvm_set_xcr);
778 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
780 unsigned long old_cr4 = kvm_read_cr4(vcpu);
781 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE |
782 X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_PKE;
784 if (cr4 & CR4_RESERVED_BITS)
787 if (!guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) && (cr4 & X86_CR4_OSXSAVE))
790 if (!guest_cpuid_has(vcpu, X86_FEATURE_SMEP) && (cr4 & X86_CR4_SMEP))
793 if (!guest_cpuid_has(vcpu, X86_FEATURE_SMAP) && (cr4 & X86_CR4_SMAP))
796 if (!guest_cpuid_has(vcpu, X86_FEATURE_FSGSBASE) && (cr4 & X86_CR4_FSGSBASE))
799 if (!guest_cpuid_has(vcpu, X86_FEATURE_PKU) && (cr4 & X86_CR4_PKE))
802 if (!guest_cpuid_has(vcpu, X86_FEATURE_LA57) && (cr4 & X86_CR4_LA57))
805 if (is_long_mode(vcpu)) {
806 if (!(cr4 & X86_CR4_PAE))
808 if ((cr4 ^ old_cr4) & X86_CR4_LA57)
810 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
811 && ((cr4 ^ old_cr4) & pdptr_bits)
812 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
816 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
817 if (!guest_cpuid_has(vcpu, X86_FEATURE_PCID))
820 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
821 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
825 if (kvm_x86_ops->set_cr4(vcpu, cr4))
828 if (((cr4 ^ old_cr4) & pdptr_bits) ||
829 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
830 kvm_mmu_reset_context(vcpu);
832 if ((cr4 ^ old_cr4) & (X86_CR4_OSXSAVE | X86_CR4_PKE))
833 kvm_update_cpuid(vcpu);
837 EXPORT_SYMBOL_GPL(kvm_set_cr4);
839 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
842 cr3 &= ~CR3_PCID_INVD;
845 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
846 kvm_mmu_sync_roots(vcpu);
847 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
851 if (is_long_mode(vcpu) &&
852 (cr3 & rsvd_bits(cpuid_maxphyaddr(vcpu), 63)))
854 else if (is_pae_paging(vcpu) &&
855 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
858 vcpu->arch.cr3 = cr3;
859 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
860 kvm_mmu_new_cr3(vcpu);
863 EXPORT_SYMBOL_GPL(kvm_set_cr3);
865 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
867 if (cr8 & CR8_RESERVED_BITS)
869 if (lapic_in_kernel(vcpu))
870 kvm_lapic_set_tpr(vcpu, cr8);
872 vcpu->arch.cr8 = cr8;
875 EXPORT_SYMBOL_GPL(kvm_set_cr8);
877 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
879 if (lapic_in_kernel(vcpu))
880 return kvm_lapic_get_cr8(vcpu);
882 return vcpu->arch.cr8;
884 EXPORT_SYMBOL_GPL(kvm_get_cr8);
886 static void kvm_update_dr0123(struct kvm_vcpu *vcpu)
890 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
891 for (i = 0; i < KVM_NR_DB_REGS; i++)
892 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
893 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_RELOAD;
897 static void kvm_update_dr6(struct kvm_vcpu *vcpu)
899 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
900 kvm_x86_ops->set_dr6(vcpu, vcpu->arch.dr6);
903 static void kvm_update_dr7(struct kvm_vcpu *vcpu)
907 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
908 dr7 = vcpu->arch.guest_debug_dr7;
910 dr7 = vcpu->arch.dr7;
911 kvm_x86_ops->set_dr7(vcpu, dr7);
912 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED;
913 if (dr7 & DR7_BP_EN_MASK)
914 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED;
917 static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu)
919 u64 fixed = DR6_FIXED_1;
921 if (!guest_cpuid_has(vcpu, X86_FEATURE_RTM))
926 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
928 size_t size = ARRAY_SIZE(vcpu->arch.db);
932 vcpu->arch.db[array_index_nospec(dr, size)] = val;
933 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
934 vcpu->arch.eff_db[dr] = val;
939 if (val & 0xffffffff00000000ULL)
941 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu);
942 kvm_update_dr6(vcpu);
947 if (val & 0xffffffff00000000ULL)
949 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
950 kvm_update_dr7(vcpu);
957 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
959 if (__kvm_set_dr(vcpu, dr, val)) {
960 kvm_inject_gp(vcpu, 0);
965 EXPORT_SYMBOL_GPL(kvm_set_dr);
967 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
969 size_t size = ARRAY_SIZE(vcpu->arch.db);
973 *val = vcpu->arch.db[array_index_nospec(dr, size)];
978 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
979 *val = vcpu->arch.dr6;
981 *val = kvm_x86_ops->get_dr6(vcpu);
986 *val = vcpu->arch.dr7;
991 EXPORT_SYMBOL_GPL(kvm_get_dr);
993 bool kvm_rdpmc(struct kvm_vcpu *vcpu)
995 u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
999 err = kvm_pmu_rdpmc(vcpu, ecx, &data);
1002 kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
1003 kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
1006 EXPORT_SYMBOL_GPL(kvm_rdpmc);
1009 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1010 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1012 * This list is modified at module load time to reflect the
1013 * capabilities of the host cpu. This capabilities test skips MSRs that are
1014 * kvm-specific. Those are put in emulated_msrs; filtering of emulated_msrs
1015 * may depend on host virtualization features rather than host cpu features.
1018 static u32 msrs_to_save[] = {
1019 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1021 #ifdef CONFIG_X86_64
1022 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1024 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
1025 MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS, MSR_TSC_AUX,
1026 MSR_IA32_SPEC_CTRL, MSR_IA32_ARCH_CAPABILITIES
1029 static unsigned num_msrs_to_save;
1031 static u32 emulated_msrs[] = {
1032 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
1033 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
1034 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
1035 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC,
1036 HV_X64_MSR_TSC_FREQUENCY, HV_X64_MSR_APIC_FREQUENCY,
1037 HV_X64_MSR_CRASH_P0, HV_X64_MSR_CRASH_P1, HV_X64_MSR_CRASH_P2,
1038 HV_X64_MSR_CRASH_P3, HV_X64_MSR_CRASH_P4, HV_X64_MSR_CRASH_CTL,
1040 HV_X64_MSR_VP_INDEX,
1041 HV_X64_MSR_VP_RUNTIME,
1042 HV_X64_MSR_SCONTROL,
1043 HV_X64_MSR_STIMER0_CONFIG,
1044 HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
1047 MSR_IA32_TSC_ADJUST,
1048 MSR_IA32_TSCDEADLINE,
1049 MSR_IA32_MISC_ENABLE,
1050 MSR_IA32_MCG_STATUS,
1052 MSR_IA32_MCG_EXT_CTL,
1055 MSR_MISC_FEATURES_ENABLES,
1056 MSR_AMD64_VIRT_SPEC_CTRL,
1059 static unsigned num_emulated_msrs;
1062 * List of msr numbers which are used to expose MSR-based features that
1063 * can be used by a hypervisor to validate requested CPU features.
1065 static u32 msr_based_features[] = {
1068 MSR_IA32_ARCH_CAPABILITIES,
1071 static unsigned int num_msr_based_features;
1073 u64 kvm_get_arch_capabilities(void)
1077 rdmsrl_safe(MSR_IA32_ARCH_CAPABILITIES, &data);
1080 * If nx_huge_pages is enabled, KVM's shadow paging will ensure that
1081 * the nested hypervisor runs with NX huge pages. If it is not,
1082 * L1 is anyway vulnerable to ITLB_MULTIHIT explots from other
1083 * L1 guests, so it need not worry about its own (L2) guests.
1085 data |= ARCH_CAP_PSCHANGE_MC_NO;
1088 * If we're doing cache flushes (either "always" or "cond")
1089 * we will do one whenever the guest does a vmlaunch/vmresume.
1090 * If an outer hypervisor is doing the cache flush for us
1091 * (VMENTER_L1D_FLUSH_NESTED_VM), we can safely pass that
1092 * capability to the guest too, and if EPT is disabled we're not
1093 * vulnerable. Overall, only VMENTER_L1D_FLUSH_NEVER will
1094 * require a nested hypervisor to do a flush of its own.
1096 if (l1tf_vmx_mitigation != VMENTER_L1D_FLUSH_NEVER)
1097 data |= ARCH_CAP_SKIP_VMENTRY_L1DFLUSH;
1099 if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
1100 data |= ARCH_CAP_RDCL_NO;
1101 if (!boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS))
1102 data |= ARCH_CAP_SSB_NO;
1103 if (!boot_cpu_has_bug(X86_BUG_MDS))
1104 data |= ARCH_CAP_MDS_NO;
1107 * On TAA affected systems, export MDS_NO=0 when:
1108 * - TSX is enabled on the host, i.e. X86_FEATURE_RTM=1.
1109 * - Updated microcode is present. This is detected by
1110 * the presence of ARCH_CAP_TSX_CTRL_MSR and ensures
1111 * that VERW clears CPU buffers.
1113 * When MDS_NO=0 is exported, guests deploy clear CPU buffer
1114 * mitigation and don't complain:
1116 * "Vulnerable: Clear CPU buffers attempted, no microcode"
1118 * If TSX is disabled on the system, guests are also mitigated against
1119 * TAA and clear CPU buffer mitigation is not required for guests.
1121 if (!boot_cpu_has(X86_FEATURE_RTM))
1122 data &= ~ARCH_CAP_TAA_NO;
1123 else if (!boot_cpu_has_bug(X86_BUG_TAA))
1124 data |= ARCH_CAP_TAA_NO;
1125 else if (data & ARCH_CAP_TSX_CTRL_MSR)
1126 data &= ~ARCH_CAP_MDS_NO;
1128 /* KVM does not emulate MSR_IA32_TSX_CTRL. */
1129 data &= ~ARCH_CAP_TSX_CTRL_MSR;
1131 /* Guests don't need to know "Fill buffer clear control" exists */
1132 data &= ~ARCH_CAP_FB_CLEAR_CTRL;
1137 EXPORT_SYMBOL_GPL(kvm_get_arch_capabilities);
1139 static int kvm_get_msr_feature(struct kvm_msr_entry *msr)
1141 switch (msr->index) {
1142 case MSR_IA32_ARCH_CAPABILITIES:
1143 msr->data = kvm_get_arch_capabilities();
1145 case MSR_IA32_UCODE_REV:
1146 rdmsrl_safe(msr->index, &msr->data);
1149 if (kvm_x86_ops->get_msr_feature(msr))
1155 static int do_get_msr_feature(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1157 struct kvm_msr_entry msr;
1161 r = kvm_get_msr_feature(&msr);
1170 static bool __kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
1172 if (efer & EFER_FFXSR && !guest_cpuid_has(vcpu, X86_FEATURE_FXSR_OPT))
1175 if (efer & EFER_SVME && !guest_cpuid_has(vcpu, X86_FEATURE_SVM))
1181 bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
1183 if (efer & efer_reserved_bits)
1186 return __kvm_valid_efer(vcpu, efer);
1188 EXPORT_SYMBOL_GPL(kvm_valid_efer);
1190 static int set_efer(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
1192 u64 old_efer = vcpu->arch.efer;
1193 u64 efer = msr_info->data;
1195 if (efer & efer_reserved_bits)
1198 if (!msr_info->host_initiated) {
1199 if (!__kvm_valid_efer(vcpu, efer))
1202 if (is_paging(vcpu) &&
1203 (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
1208 efer |= vcpu->arch.efer & EFER_LMA;
1210 kvm_x86_ops->set_efer(vcpu, efer);
1212 /* Update reserved bits */
1213 if ((efer ^ old_efer) & EFER_NX)
1214 kvm_mmu_reset_context(vcpu);
1219 void kvm_enable_efer_bits(u64 mask)
1221 efer_reserved_bits &= ~mask;
1223 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
1226 * Writes msr value into into the appropriate "register".
1227 * Returns 0 on success, non-0 otherwise.
1228 * Assumes vcpu_load() was already called.
1230 int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
1232 switch (msr->index) {
1235 case MSR_KERNEL_GS_BASE:
1238 if (is_noncanonical_address(msr->data, vcpu))
1241 case MSR_IA32_SYSENTER_EIP:
1242 case MSR_IA32_SYSENTER_ESP:
1244 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
1245 * non-canonical address is written on Intel but not on
1246 * AMD (which ignores the top 32-bits, because it does
1247 * not implement 64-bit SYSENTER).
1249 * 64-bit code should hence be able to write a non-canonical
1250 * value on AMD. Making the address canonical ensures that
1251 * vmentry does not fail on Intel after writing a non-canonical
1252 * value, and that something deterministic happens if the guest
1253 * invokes 64-bit SYSENTER.
1255 msr->data = get_canonical(msr->data, vcpu_virt_addr_bits(vcpu));
1257 return kvm_x86_ops->set_msr(vcpu, msr);
1259 EXPORT_SYMBOL_GPL(kvm_set_msr);
1262 * Adapt set_msr() to msr_io()'s calling convention
1264 static int do_get_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1266 struct msr_data msr;
1270 msr.host_initiated = true;
1271 r = kvm_get_msr(vcpu, &msr);
1279 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1281 struct msr_data msr;
1285 msr.host_initiated = true;
1286 return kvm_set_msr(vcpu, &msr);
1289 #ifdef CONFIG_X86_64
1290 struct pvclock_gtod_data {
1293 struct { /* extract of a clocksource struct */
1306 static struct pvclock_gtod_data pvclock_gtod_data;
1308 static void update_pvclock_gtod(struct timekeeper *tk)
1310 struct pvclock_gtod_data *vdata = &pvclock_gtod_data;
1313 boot_ns = ktime_to_ns(ktime_add(tk->tkr_mono.base, tk->offs_boot));
1315 write_seqcount_begin(&vdata->seq);
1317 /* copy pvclock gtod data */
1318 vdata->clock.vclock_mode = tk->tkr_mono.clock->archdata.vclock_mode;
1319 vdata->clock.cycle_last = tk->tkr_mono.cycle_last;
1320 vdata->clock.mask = tk->tkr_mono.mask;
1321 vdata->clock.mult = tk->tkr_mono.mult;
1322 vdata->clock.shift = tk->tkr_mono.shift;
1324 vdata->boot_ns = boot_ns;
1325 vdata->nsec_base = tk->tkr_mono.xtime_nsec;
1327 vdata->wall_time_sec = tk->xtime_sec;
1329 write_seqcount_end(&vdata->seq);
1333 void kvm_set_pending_timer(struct kvm_vcpu *vcpu)
1336 * Note: KVM_REQ_PENDING_TIMER is implicitly checked in
1337 * vcpu_enter_guest. This function is only called from
1338 * the physical CPU that is running vcpu.
1340 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
1343 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
1347 struct pvclock_wall_clock wc;
1348 struct timespec64 boot;
1353 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
1358 ++version; /* first time write, random junk */
1362 if (kvm_write_guest(kvm, wall_clock, &version, sizeof(version)))
1366 * The guest calculates current wall clock time by adding
1367 * system time (updated by kvm_guest_time_update below) to the
1368 * wall clock specified here. guest system time equals host
1369 * system time for us, thus we must fill in host boot time here.
1371 getboottime64(&boot);
1373 if (kvm->arch.kvmclock_offset) {
1374 struct timespec64 ts = ns_to_timespec64(kvm->arch.kvmclock_offset);
1375 boot = timespec64_sub(boot, ts);
1377 wc.sec = (u32)boot.tv_sec; /* overflow in 2106 guest time */
1378 wc.nsec = boot.tv_nsec;
1379 wc.version = version;
1381 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
1384 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
1387 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
1389 do_shl32_div32(dividend, divisor);
1393 static void kvm_get_time_scale(uint64_t scaled_hz, uint64_t base_hz,
1394 s8 *pshift, u32 *pmultiplier)
1402 scaled64 = scaled_hz;
1403 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
1408 tps32 = (uint32_t)tps64;
1409 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
1410 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
1418 *pmultiplier = div_frac(scaled64, tps32);
1420 pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n",
1421 __func__, base_hz, scaled_hz, shift, *pmultiplier);
1424 #ifdef CONFIG_X86_64
1425 static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0);
1428 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
1429 static unsigned long max_tsc_khz;
1431 static u32 adjust_tsc_khz(u32 khz, s32 ppm)
1433 u64 v = (u64)khz * (1000000 + ppm);
1438 static int set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
1442 /* Guest TSC same frequency as host TSC? */
1444 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio;
1448 /* TSC scaling supported? */
1449 if (!kvm_has_tsc_control) {
1450 if (user_tsc_khz > tsc_khz) {
1451 vcpu->arch.tsc_catchup = 1;
1452 vcpu->arch.tsc_always_catchup = 1;
1455 pr_warn_ratelimited("user requested TSC rate below hardware speed\n");
1460 /* TSC scaling required - calculate ratio */
1461 ratio = mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits,
1462 user_tsc_khz, tsc_khz);
1464 if (ratio == 0 || ratio >= kvm_max_tsc_scaling_ratio) {
1465 pr_warn_ratelimited("Invalid TSC scaling ratio - virtual-tsc-khz=%u\n",
1470 vcpu->arch.tsc_scaling_ratio = ratio;
1474 static int kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
1476 u32 thresh_lo, thresh_hi;
1477 int use_scaling = 0;
1479 /* tsc_khz can be zero if TSC calibration fails */
1480 if (user_tsc_khz == 0) {
1481 /* set tsc_scaling_ratio to a safe value */
1482 vcpu->arch.tsc_scaling_ratio = kvm_default_tsc_scaling_ratio;
1486 /* Compute a scale to convert nanoseconds in TSC cycles */
1487 kvm_get_time_scale(user_tsc_khz * 1000LL, NSEC_PER_SEC,
1488 &vcpu->arch.virtual_tsc_shift,
1489 &vcpu->arch.virtual_tsc_mult);
1490 vcpu->arch.virtual_tsc_khz = user_tsc_khz;
1493 * Compute the variation in TSC rate which is acceptable
1494 * within the range of tolerance and decide if the
1495 * rate being applied is within that bounds of the hardware
1496 * rate. If so, no scaling or compensation need be done.
1498 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
1499 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
1500 if (user_tsc_khz < thresh_lo || user_tsc_khz > thresh_hi) {
1501 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz, thresh_lo, thresh_hi);
1504 return set_tsc_khz(vcpu, user_tsc_khz, use_scaling);
1507 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1509 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
1510 vcpu->arch.virtual_tsc_mult,
1511 vcpu->arch.virtual_tsc_shift);
1512 tsc += vcpu->arch.this_tsc_write;
1516 static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
1518 #ifdef CONFIG_X86_64
1520 struct kvm_arch *ka = &vcpu->kvm->arch;
1521 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
1523 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
1524 atomic_read(&vcpu->kvm->online_vcpus));
1527 * Once the masterclock is enabled, always perform request in
1528 * order to update it.
1530 * In order to enable masterclock, the host clocksource must be TSC
1531 * and the vcpus need to have matched TSCs. When that happens,
1532 * perform request to enable masterclock.
1534 if (ka->use_master_clock ||
1535 (gtod->clock.vclock_mode == VCLOCK_TSC && vcpus_matched))
1536 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
1538 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc,
1539 atomic_read(&vcpu->kvm->online_vcpus),
1540 ka->use_master_clock, gtod->clock.vclock_mode);
1544 static void update_ia32_tsc_adjust_msr(struct kvm_vcpu *vcpu, s64 offset)
1546 u64 curr_offset = vcpu->arch.tsc_offset;
1547 vcpu->arch.ia32_tsc_adjust_msr += offset - curr_offset;
1551 * Multiply tsc by a fixed point number represented by ratio.
1553 * The most significant 64-N bits (mult) of ratio represent the
1554 * integral part of the fixed point number; the remaining N bits
1555 * (frac) represent the fractional part, ie. ratio represents a fixed
1556 * point number (mult + frac * 2^(-N)).
1558 * N equals to kvm_tsc_scaling_ratio_frac_bits.
1560 static inline u64 __scale_tsc(u64 ratio, u64 tsc)
1562 return mul_u64_u64_shr(tsc, ratio, kvm_tsc_scaling_ratio_frac_bits);
1565 u64 kvm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc)
1568 u64 ratio = vcpu->arch.tsc_scaling_ratio;
1570 if (ratio != kvm_default_tsc_scaling_ratio)
1571 _tsc = __scale_tsc(ratio, tsc);
1575 EXPORT_SYMBOL_GPL(kvm_scale_tsc);
1577 static u64 kvm_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
1581 tsc = kvm_scale_tsc(vcpu, rdtsc());
1583 return target_tsc - tsc;
1586 u64 kvm_read_l1_tsc(struct kvm_vcpu *vcpu, u64 host_tsc)
1588 return vcpu->arch.tsc_offset + kvm_scale_tsc(vcpu, host_tsc);
1590 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc);
1592 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1594 kvm_x86_ops->write_tsc_offset(vcpu, offset);
1595 vcpu->arch.tsc_offset = offset;
1598 void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr)
1600 struct kvm *kvm = vcpu->kvm;
1601 u64 offset, ns, elapsed;
1602 unsigned long flags;
1604 bool already_matched;
1605 u64 data = msr->data;
1606 bool synchronizing = false;
1608 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1609 offset = kvm_compute_tsc_offset(vcpu, data);
1610 ns = ktime_get_boot_ns();
1611 elapsed = ns - kvm->arch.last_tsc_nsec;
1613 if (vcpu->arch.virtual_tsc_khz) {
1614 if (data == 0 && msr->host_initiated) {
1616 * detection of vcpu initialization -- need to sync
1617 * with other vCPUs. This particularly helps to keep
1618 * kvm_clock stable after CPU hotplug
1620 synchronizing = true;
1622 u64 tsc_exp = kvm->arch.last_tsc_write +
1623 nsec_to_cycles(vcpu, elapsed);
1624 u64 tsc_hz = vcpu->arch.virtual_tsc_khz * 1000LL;
1626 * Special case: TSC write with a small delta (1 second)
1627 * of virtual cycle time against real time is
1628 * interpreted as an attempt to synchronize the CPU.
1630 synchronizing = data < tsc_exp + tsc_hz &&
1631 data + tsc_hz > tsc_exp;
1636 * For a reliable TSC, we can match TSC offsets, and for an unstable
1637 * TSC, we add elapsed time in this computation. We could let the
1638 * compensation code attempt to catch up if we fall behind, but
1639 * it's better to try to match offsets from the beginning.
1641 if (synchronizing &&
1642 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
1643 if (!check_tsc_unstable()) {
1644 offset = kvm->arch.cur_tsc_offset;
1645 pr_debug("kvm: matched tsc offset for %llu\n", data);
1647 u64 delta = nsec_to_cycles(vcpu, elapsed);
1649 offset = kvm_compute_tsc_offset(vcpu, data);
1650 pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1653 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation);
1656 * We split periods of matched TSC writes into generations.
1657 * For each generation, we track the original measured
1658 * nanosecond time, offset, and write, so if TSCs are in
1659 * sync, we can match exact offset, and if not, we can match
1660 * exact software computation in compute_guest_tsc()
1662 * These values are tracked in kvm->arch.cur_xxx variables.
1664 kvm->arch.cur_tsc_generation++;
1665 kvm->arch.cur_tsc_nsec = ns;
1666 kvm->arch.cur_tsc_write = data;
1667 kvm->arch.cur_tsc_offset = offset;
1669 pr_debug("kvm: new tsc generation %llu, clock %llu\n",
1670 kvm->arch.cur_tsc_generation, data);
1674 * We also track th most recent recorded KHZ, write and time to
1675 * allow the matching interval to be extended at each write.
1677 kvm->arch.last_tsc_nsec = ns;
1678 kvm->arch.last_tsc_write = data;
1679 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
1681 vcpu->arch.last_guest_tsc = data;
1683 /* Keep track of which generation this VCPU has synchronized to */
1684 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
1685 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
1686 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
1688 if (!msr->host_initiated && guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST))
1689 update_ia32_tsc_adjust_msr(vcpu, offset);
1691 kvm_vcpu_write_tsc_offset(vcpu, offset);
1692 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1694 spin_lock(&kvm->arch.pvclock_gtod_sync_lock);
1696 kvm->arch.nr_vcpus_matched_tsc = 0;
1697 } else if (!already_matched) {
1698 kvm->arch.nr_vcpus_matched_tsc++;
1701 kvm_track_tsc_matching(vcpu);
1702 spin_unlock(&kvm->arch.pvclock_gtod_sync_lock);
1705 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1707 static inline void adjust_tsc_offset_guest(struct kvm_vcpu *vcpu,
1710 kvm_vcpu_write_tsc_offset(vcpu, vcpu->arch.tsc_offset + adjustment);
1713 static inline void adjust_tsc_offset_host(struct kvm_vcpu *vcpu, s64 adjustment)
1715 if (vcpu->arch.tsc_scaling_ratio != kvm_default_tsc_scaling_ratio)
1716 WARN_ON(adjustment < 0);
1717 adjustment = kvm_scale_tsc(vcpu, (u64) adjustment);
1718 adjust_tsc_offset_guest(vcpu, adjustment);
1721 #ifdef CONFIG_X86_64
1723 static u64 read_tsc(void)
1725 u64 ret = (u64)rdtsc_ordered();
1726 u64 last = pvclock_gtod_data.clock.cycle_last;
1728 if (likely(ret >= last))
1732 * GCC likes to generate cmov here, but this branch is extremely
1733 * predictable (it's just a function of time and the likely is
1734 * very likely) and there's a data dependence, so force GCC
1735 * to generate a branch instead. I don't barrier() because
1736 * we don't actually need a barrier, and if this function
1737 * ever gets inlined it will generate worse code.
1743 static inline u64 vgettsc(u64 *cycle_now)
1746 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
1748 *cycle_now = read_tsc();
1750 v = (*cycle_now - gtod->clock.cycle_last) & gtod->clock.mask;
1751 return v * gtod->clock.mult;
1754 static int do_monotonic_boot(s64 *t, u64 *cycle_now)
1756 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
1762 seq = read_seqcount_begin(>od->seq);
1763 mode = gtod->clock.vclock_mode;
1764 ns = gtod->nsec_base;
1765 ns += vgettsc(cycle_now);
1766 ns >>= gtod->clock.shift;
1767 ns += gtod->boot_ns;
1768 } while (unlikely(read_seqcount_retry(>od->seq, seq)));
1774 static int do_realtime(struct timespec *ts, u64 *cycle_now)
1776 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
1782 seq = read_seqcount_begin(>od->seq);
1783 mode = gtod->clock.vclock_mode;
1784 ts->tv_sec = gtod->wall_time_sec;
1785 ns = gtod->nsec_base;
1786 ns += vgettsc(cycle_now);
1787 ns >>= gtod->clock.shift;
1788 } while (unlikely(read_seqcount_retry(>od->seq, seq)));
1790 ts->tv_sec += __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
1796 /* returns true if host is using tsc clocksource */
1797 static bool kvm_get_time_and_clockread(s64 *kernel_ns, u64 *cycle_now)
1799 /* checked again under seqlock below */
1800 if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC)
1803 return do_monotonic_boot(kernel_ns, cycle_now) == VCLOCK_TSC;
1806 /* returns true if host is using tsc clocksource */
1807 static bool kvm_get_walltime_and_clockread(struct timespec *ts,
1810 /* checked again under seqlock below */
1811 if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC)
1814 return do_realtime(ts, cycle_now) == VCLOCK_TSC;
1820 * Assuming a stable TSC across physical CPUS, and a stable TSC
1821 * across virtual CPUs, the following condition is possible.
1822 * Each numbered line represents an event visible to both
1823 * CPUs at the next numbered event.
1825 * "timespecX" represents host monotonic time. "tscX" represents
1828 * VCPU0 on CPU0 | VCPU1 on CPU1
1830 * 1. read timespec0,tsc0
1831 * 2. | timespec1 = timespec0 + N
1833 * 3. transition to guest | transition to guest
1834 * 4. ret0 = timespec0 + (rdtsc - tsc0) |
1835 * 5. | ret1 = timespec1 + (rdtsc - tsc1)
1836 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
1838 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
1841 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
1843 * - 0 < N - M => M < N
1845 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not
1846 * always the case (the difference between two distinct xtime instances
1847 * might be smaller then the difference between corresponding TSC reads,
1848 * when updating guest vcpus pvclock areas).
1850 * To avoid that problem, do not allow visibility of distinct
1851 * system_timestamp/tsc_timestamp values simultaneously: use a master
1852 * copy of host monotonic time values. Update that master copy
1855 * Rely on synchronization of host TSCs and guest TSCs for monotonicity.
1859 static void pvclock_update_vm_gtod_copy(struct kvm *kvm)
1861 #ifdef CONFIG_X86_64
1862 struct kvm_arch *ka = &kvm->arch;
1864 bool host_tsc_clocksource, vcpus_matched;
1866 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
1867 atomic_read(&kvm->online_vcpus));
1870 * If the host uses TSC clock, then passthrough TSC as stable
1873 host_tsc_clocksource = kvm_get_time_and_clockread(
1874 &ka->master_kernel_ns,
1875 &ka->master_cycle_now);
1877 ka->use_master_clock = host_tsc_clocksource && vcpus_matched
1878 && !ka->backwards_tsc_observed
1879 && !ka->boot_vcpu_runs_old_kvmclock;
1881 if (ka->use_master_clock)
1882 atomic_set(&kvm_guest_has_master_clock, 1);
1884 vclock_mode = pvclock_gtod_data.clock.vclock_mode;
1885 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode,
1890 void kvm_make_mclock_inprogress_request(struct kvm *kvm)
1892 kvm_make_all_cpus_request(kvm, KVM_REQ_MCLOCK_INPROGRESS);
1895 static void kvm_gen_update_masterclock(struct kvm *kvm)
1897 #ifdef CONFIG_X86_64
1899 struct kvm_vcpu *vcpu;
1900 struct kvm_arch *ka = &kvm->arch;
1902 spin_lock(&ka->pvclock_gtod_sync_lock);
1903 kvm_make_mclock_inprogress_request(kvm);
1904 /* no guest entries from this point */
1905 pvclock_update_vm_gtod_copy(kvm);
1907 kvm_for_each_vcpu(i, vcpu, kvm)
1908 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1910 /* guest entries allowed */
1911 kvm_for_each_vcpu(i, vcpu, kvm)
1912 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS, vcpu);
1914 spin_unlock(&ka->pvclock_gtod_sync_lock);
1918 u64 get_kvmclock_ns(struct kvm *kvm)
1920 struct kvm_arch *ka = &kvm->arch;
1921 struct pvclock_vcpu_time_info hv_clock;
1924 spin_lock(&ka->pvclock_gtod_sync_lock);
1925 if (!ka->use_master_clock) {
1926 spin_unlock(&ka->pvclock_gtod_sync_lock);
1927 return ktime_get_boot_ns() + ka->kvmclock_offset;
1930 hv_clock.tsc_timestamp = ka->master_cycle_now;
1931 hv_clock.system_time = ka->master_kernel_ns + ka->kvmclock_offset;
1932 spin_unlock(&ka->pvclock_gtod_sync_lock);
1934 /* both __this_cpu_read() and rdtsc() should be on the same cpu */
1937 if (__this_cpu_read(cpu_tsc_khz)) {
1938 kvm_get_time_scale(NSEC_PER_SEC, __this_cpu_read(cpu_tsc_khz) * 1000LL,
1939 &hv_clock.tsc_shift,
1940 &hv_clock.tsc_to_system_mul);
1941 ret = __pvclock_read_cycles(&hv_clock, rdtsc());
1943 ret = ktime_get_boot_ns() + ka->kvmclock_offset;
1950 static void kvm_setup_pvclock_page(struct kvm_vcpu *v)
1952 struct kvm_vcpu_arch *vcpu = &v->arch;
1953 struct pvclock_vcpu_time_info guest_hv_clock;
1955 if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time,
1956 &guest_hv_clock, sizeof(guest_hv_clock))))
1959 /* This VCPU is paused, but it's legal for a guest to read another
1960 * VCPU's kvmclock, so we really have to follow the specification where
1961 * it says that version is odd if data is being modified, and even after
1964 * Version field updates must be kept separate. This is because
1965 * kvm_write_guest_cached might use a "rep movs" instruction, and
1966 * writes within a string instruction are weakly ordered. So there
1967 * are three writes overall.
1969 * As a small optimization, only write the version field in the first
1970 * and third write. The vcpu->pv_time cache is still valid, because the
1971 * version field is the first in the struct.
1973 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) != 0);
1975 if (guest_hv_clock.version & 1)
1976 ++guest_hv_clock.version; /* first time write, random junk */
1978 vcpu->hv_clock.version = guest_hv_clock.version + 1;
1979 kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
1981 sizeof(vcpu->hv_clock.version));
1985 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
1986 vcpu->hv_clock.flags |= (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED);
1988 if (vcpu->pvclock_set_guest_stopped_request) {
1989 vcpu->hv_clock.flags |= PVCLOCK_GUEST_STOPPED;
1990 vcpu->pvclock_set_guest_stopped_request = false;
1993 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
1995 kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
1997 sizeof(vcpu->hv_clock));
2001 vcpu->hv_clock.version++;
2002 kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
2004 sizeof(vcpu->hv_clock.version));
2007 static int kvm_guest_time_update(struct kvm_vcpu *v)
2009 unsigned long flags, tgt_tsc_khz;
2010 struct kvm_vcpu_arch *vcpu = &v->arch;
2011 struct kvm_arch *ka = &v->kvm->arch;
2013 u64 tsc_timestamp, host_tsc;
2015 bool use_master_clock;
2021 * If the host uses TSC clock, then passthrough TSC as stable
2024 spin_lock(&ka->pvclock_gtod_sync_lock);
2025 use_master_clock = ka->use_master_clock;
2026 if (use_master_clock) {
2027 host_tsc = ka->master_cycle_now;
2028 kernel_ns = ka->master_kernel_ns;
2030 spin_unlock(&ka->pvclock_gtod_sync_lock);
2032 /* Keep irq disabled to prevent changes to the clock */
2033 local_irq_save(flags);
2034 tgt_tsc_khz = __this_cpu_read(cpu_tsc_khz);
2035 if (unlikely(tgt_tsc_khz == 0)) {
2036 local_irq_restore(flags);
2037 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
2040 if (!use_master_clock) {
2042 kernel_ns = ktime_get_boot_ns();
2045 tsc_timestamp = kvm_read_l1_tsc(v, host_tsc);
2048 * We may have to catch up the TSC to match elapsed wall clock
2049 * time for two reasons, even if kvmclock is used.
2050 * 1) CPU could have been running below the maximum TSC rate
2051 * 2) Broken TSC compensation resets the base at each VCPU
2052 * entry to avoid unknown leaps of TSC even when running
2053 * again on the same CPU. This may cause apparent elapsed
2054 * time to disappear, and the guest to stand still or run
2057 if (vcpu->tsc_catchup) {
2058 u64 tsc = compute_guest_tsc(v, kernel_ns);
2059 if (tsc > tsc_timestamp) {
2060 adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
2061 tsc_timestamp = tsc;
2065 local_irq_restore(flags);
2067 /* With all the info we got, fill in the values */
2069 if (kvm_has_tsc_control)
2070 tgt_tsc_khz = kvm_scale_tsc(v, tgt_tsc_khz);
2072 if (unlikely(vcpu->hw_tsc_khz != tgt_tsc_khz)) {
2073 kvm_get_time_scale(NSEC_PER_SEC, tgt_tsc_khz * 1000LL,
2074 &vcpu->hv_clock.tsc_shift,
2075 &vcpu->hv_clock.tsc_to_system_mul);
2076 vcpu->hw_tsc_khz = tgt_tsc_khz;
2079 vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
2080 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
2081 vcpu->last_guest_tsc = tsc_timestamp;
2083 /* If the host uses TSC clocksource, then it is stable */
2085 if (use_master_clock)
2086 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT;
2088 vcpu->hv_clock.flags = pvclock_flags;
2090 if (vcpu->pv_time_enabled)
2091 kvm_setup_pvclock_page(v);
2092 if (v == kvm_get_vcpu(v->kvm, 0))
2093 kvm_hv_setup_tsc_page(v->kvm, &vcpu->hv_clock);
2098 * kvmclock updates which are isolated to a given vcpu, such as
2099 * vcpu->cpu migration, should not allow system_timestamp from
2100 * the rest of the vcpus to remain static. Otherwise ntp frequency
2101 * correction applies to one vcpu's system_timestamp but not
2104 * So in those cases, request a kvmclock update for all vcpus.
2105 * We need to rate-limit these requests though, as they can
2106 * considerably slow guests that have a large number of vcpus.
2107 * The time for a remote vcpu to update its kvmclock is bound
2108 * by the delay we use to rate-limit the updates.
2111 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100)
2113 static void kvmclock_update_fn(struct work_struct *work)
2116 struct delayed_work *dwork = to_delayed_work(work);
2117 struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
2118 kvmclock_update_work);
2119 struct kvm *kvm = container_of(ka, struct kvm, arch);
2120 struct kvm_vcpu *vcpu;
2122 kvm_for_each_vcpu(i, vcpu, kvm) {
2123 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2124 kvm_vcpu_kick(vcpu);
2128 static void kvm_gen_kvmclock_update(struct kvm_vcpu *v)
2130 struct kvm *kvm = v->kvm;
2132 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
2133 schedule_delayed_work(&kvm->arch.kvmclock_update_work,
2134 KVMCLOCK_UPDATE_DELAY);
2137 #define KVMCLOCK_SYNC_PERIOD (300 * HZ)
2139 static void kvmclock_sync_fn(struct work_struct *work)
2141 struct delayed_work *dwork = to_delayed_work(work);
2142 struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
2143 kvmclock_sync_work);
2144 struct kvm *kvm = container_of(ka, struct kvm, arch);
2146 if (!kvmclock_periodic_sync)
2149 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0);
2150 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
2151 KVMCLOCK_SYNC_PERIOD);
2154 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
2156 u64 mcg_cap = vcpu->arch.mcg_cap;
2157 unsigned bank_num = mcg_cap & 0xff;
2160 case MSR_IA32_MCG_STATUS:
2161 vcpu->arch.mcg_status = data;
2163 case MSR_IA32_MCG_CTL:
2164 if (!(mcg_cap & MCG_CTL_P))
2166 if (data != 0 && data != ~(u64)0)
2168 vcpu->arch.mcg_ctl = data;
2171 if (msr >= MSR_IA32_MC0_CTL &&
2172 msr < MSR_IA32_MCx_CTL(bank_num)) {
2173 u32 offset = array_index_nospec(
2174 msr - MSR_IA32_MC0_CTL,
2175 MSR_IA32_MCx_CTL(bank_num) - MSR_IA32_MC0_CTL);
2177 /* only 0 or all 1s can be written to IA32_MCi_CTL
2178 * some Linux kernels though clear bit 10 in bank 4 to
2179 * workaround a BIOS/GART TBL issue on AMD K8s, ignore
2180 * this to avoid an uncatched #GP in the guest
2182 if ((offset & 0x3) == 0 &&
2183 data != 0 && (data | (1 << 10)) != ~(u64)0)
2185 vcpu->arch.mce_banks[offset] = data;
2193 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
2195 struct kvm *kvm = vcpu->kvm;
2196 int lm = is_long_mode(vcpu);
2197 u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
2198 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
2199 u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
2200 : kvm->arch.xen_hvm_config.blob_size_32;
2201 u32 page_num = data & ~PAGE_MASK;
2202 u64 page_addr = data & PAGE_MASK;
2207 if (page_num >= blob_size)
2210 page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
2215 if (kvm_vcpu_write_guest(vcpu, page_addr, page, PAGE_SIZE))
2224 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
2226 gpa_t gpa = data & ~0x3f;
2228 /* Bits 3:5 are reserved, Should be zero */
2232 vcpu->arch.apf.msr_val = data;
2234 if (!(data & KVM_ASYNC_PF_ENABLED)) {
2235 kvm_clear_async_pf_completion_queue(vcpu);
2236 kvm_async_pf_hash_reset(vcpu);
2240 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
2244 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
2245 vcpu->arch.apf.delivery_as_pf_vmexit = data & KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT;
2246 kvm_async_pf_wakeup_all(vcpu);
2250 static void kvmclock_reset(struct kvm_vcpu *vcpu)
2252 vcpu->arch.pv_time_enabled = false;
2255 static void record_steal_time(struct kvm_vcpu *vcpu)
2257 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
2260 if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
2261 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
2264 vcpu->arch.st.steal.preempted = 0;
2266 if (vcpu->arch.st.steal.version & 1)
2267 vcpu->arch.st.steal.version += 1; /* first time write, random junk */
2269 vcpu->arch.st.steal.version += 1;
2271 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
2272 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
2276 vcpu->arch.st.steal.steal += current->sched_info.run_delay -
2277 vcpu->arch.st.last_steal;
2278 vcpu->arch.st.last_steal = current->sched_info.run_delay;
2280 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
2281 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
2285 vcpu->arch.st.steal.version += 1;
2287 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
2288 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
2291 int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
2294 u32 msr = msr_info->index;
2295 u64 data = msr_info->data;
2298 case MSR_AMD64_NB_CFG:
2299 case MSR_IA32_UCODE_WRITE:
2300 case MSR_VM_HSAVE_PA:
2301 case MSR_AMD64_PATCH_LOADER:
2302 case MSR_AMD64_BU_CFG2:
2303 case MSR_AMD64_DC_CFG:
2304 case MSR_F15H_EX_CFG:
2307 case MSR_IA32_UCODE_REV:
2308 if (msr_info->host_initiated)
2309 vcpu->arch.microcode_version = data;
2311 case MSR_IA32_ARCH_CAPABILITIES:
2312 if (!msr_info->host_initiated)
2314 vcpu->arch.arch_capabilities = data;
2317 return set_efer(vcpu, msr_info);
2319 data &= ~(u64)0x40; /* ignore flush filter disable */
2320 data &= ~(u64)0x100; /* ignore ignne emulation enable */
2321 data &= ~(u64)0x8; /* ignore TLB cache disable */
2322 data &= ~(u64)0x40000; /* ignore Mc status write enable */
2324 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
2329 case MSR_FAM10H_MMIO_CONF_BASE:
2331 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
2336 case MSR_IA32_DEBUGCTLMSR:
2338 /* We support the non-activated case already */
2340 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
2341 /* Values other than LBR and BTF are vendor-specific,
2342 thus reserved and should throw a #GP */
2345 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
2348 case 0x200 ... 0x2ff:
2349 return kvm_mtrr_set_msr(vcpu, msr, data);
2350 case MSR_IA32_APICBASE:
2351 return kvm_set_apic_base(vcpu, msr_info);
2352 case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff:
2353 return kvm_x2apic_msr_write(vcpu, msr, data);
2354 case MSR_IA32_TSCDEADLINE:
2355 kvm_set_lapic_tscdeadline_msr(vcpu, data);
2357 case MSR_IA32_TSC_ADJUST:
2358 if (guest_cpuid_has(vcpu, X86_FEATURE_TSC_ADJUST)) {
2359 if (!msr_info->host_initiated) {
2360 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr;
2361 adjust_tsc_offset_guest(vcpu, adj);
2362 /* Before back to guest, tsc_timestamp must be adjusted
2363 * as well, otherwise guest's percpu pvclock time could jump.
2365 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2367 vcpu->arch.ia32_tsc_adjust_msr = data;
2370 case MSR_IA32_MISC_ENABLE:
2371 vcpu->arch.ia32_misc_enable_msr = data;
2373 case MSR_IA32_SMBASE:
2374 if (!msr_info->host_initiated)
2376 vcpu->arch.smbase = data;
2378 case MSR_KVM_WALL_CLOCK_NEW:
2379 case MSR_KVM_WALL_CLOCK:
2380 vcpu->kvm->arch.wall_clock = data;
2381 kvm_write_wall_clock(vcpu->kvm, data);
2383 case MSR_KVM_SYSTEM_TIME_NEW:
2384 case MSR_KVM_SYSTEM_TIME: {
2385 struct kvm_arch *ka = &vcpu->kvm->arch;
2387 kvmclock_reset(vcpu);
2389 if (vcpu->vcpu_id == 0 && !msr_info->host_initiated) {
2390 bool tmp = (msr == MSR_KVM_SYSTEM_TIME);
2392 if (ka->boot_vcpu_runs_old_kvmclock != tmp)
2393 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
2395 ka->boot_vcpu_runs_old_kvmclock = tmp;
2398 vcpu->arch.time = data;
2399 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
2401 /* we verify if the enable bit is set... */
2405 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
2406 &vcpu->arch.pv_time, data & ~1ULL,
2407 sizeof(struct pvclock_vcpu_time_info)))
2408 vcpu->arch.pv_time_enabled = false;
2410 vcpu->arch.pv_time_enabled = true;
2414 case MSR_KVM_ASYNC_PF_EN:
2415 if (kvm_pv_enable_async_pf(vcpu, data))
2418 case MSR_KVM_STEAL_TIME:
2420 if (unlikely(!sched_info_on()))
2423 if (data & KVM_STEAL_RESERVED_MASK)
2426 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
2427 data & KVM_STEAL_VALID_BITS,
2428 sizeof(struct kvm_steal_time)))
2431 vcpu->arch.st.msr_val = data;
2433 if (!(data & KVM_MSR_ENABLED))
2436 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
2439 case MSR_KVM_PV_EOI_EN:
2440 if (kvm_lapic_enable_pv_eoi(vcpu, data))
2444 case MSR_IA32_MCG_CTL:
2445 case MSR_IA32_MCG_STATUS:
2446 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
2447 return set_msr_mce(vcpu, msr, data);
2449 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3:
2450 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1:
2451 pr = true; /* fall through */
2452 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
2453 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1:
2454 if (kvm_pmu_is_valid_msr(vcpu, msr))
2455 return kvm_pmu_set_msr(vcpu, msr_info);
2457 if (pr || data != 0)
2458 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
2459 "0x%x data 0x%llx\n", msr, data);
2461 case MSR_K7_CLK_CTL:
2463 * Ignore all writes to this no longer documented MSR.
2464 * Writes are only relevant for old K7 processors,
2465 * all pre-dating SVM, but a recommended workaround from
2466 * AMD for these chips. It is possible to specify the
2467 * affected processor models on the command line, hence
2468 * the need to ignore the workaround.
2471 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
2472 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
2473 case HV_X64_MSR_CRASH_CTL:
2474 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
2475 return kvm_hv_set_msr_common(vcpu, msr, data,
2476 msr_info->host_initiated);
2477 case MSR_IA32_BBL_CR_CTL3:
2478 /* Drop writes to this legacy MSR -- see rdmsr
2479 * counterpart for further detail.
2481 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n", msr, data);
2483 case MSR_AMD64_OSVW_ID_LENGTH:
2484 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
2486 vcpu->arch.osvw.length = data;
2488 case MSR_AMD64_OSVW_STATUS:
2489 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
2491 vcpu->arch.osvw.status = data;
2493 case MSR_PLATFORM_INFO:
2494 if (!msr_info->host_initiated ||
2495 data & ~MSR_PLATFORM_INFO_CPUID_FAULT ||
2496 (!(data & MSR_PLATFORM_INFO_CPUID_FAULT) &&
2497 cpuid_fault_enabled(vcpu)))
2499 vcpu->arch.msr_platform_info = data;
2501 case MSR_MISC_FEATURES_ENABLES:
2502 if (data & ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT ||
2503 (data & MSR_MISC_FEATURES_ENABLES_CPUID_FAULT &&
2504 !supports_cpuid_fault(vcpu)))
2506 vcpu->arch.msr_misc_features_enables = data;
2509 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
2510 return xen_hvm_config(vcpu, data);
2511 if (kvm_pmu_is_valid_msr(vcpu, msr))
2512 return kvm_pmu_set_msr(vcpu, msr_info);
2514 vcpu_debug_ratelimited(vcpu, "unhandled wrmsr: 0x%x data 0x%llx\n",
2518 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data 0x%llx\n",
2525 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
2529 * Reads an msr value (of 'msr_index') into 'pdata'.
2530 * Returns 0 on success, non-0 otherwise.
2531 * Assumes vcpu_load() was already called.
2533 int kvm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
2535 return kvm_x86_ops->get_msr(vcpu, msr);
2537 EXPORT_SYMBOL_GPL(kvm_get_msr);
2539 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
2542 u64 mcg_cap = vcpu->arch.mcg_cap;
2543 unsigned bank_num = mcg_cap & 0xff;
2546 case MSR_IA32_P5_MC_ADDR:
2547 case MSR_IA32_P5_MC_TYPE:
2550 case MSR_IA32_MCG_CAP:
2551 data = vcpu->arch.mcg_cap;
2553 case MSR_IA32_MCG_CTL:
2554 if (!(mcg_cap & MCG_CTL_P))
2556 data = vcpu->arch.mcg_ctl;
2558 case MSR_IA32_MCG_STATUS:
2559 data = vcpu->arch.mcg_status;
2562 if (msr >= MSR_IA32_MC0_CTL &&
2563 msr < MSR_IA32_MCx_CTL(bank_num)) {
2564 u32 offset = array_index_nospec(
2565 msr - MSR_IA32_MC0_CTL,
2566 MSR_IA32_MCx_CTL(bank_num) - MSR_IA32_MC0_CTL);
2568 data = vcpu->arch.mce_banks[offset];
2577 int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
2579 switch (msr_info->index) {
2580 case MSR_IA32_PLATFORM_ID:
2581 case MSR_IA32_EBL_CR_POWERON:
2582 case MSR_IA32_DEBUGCTLMSR:
2583 case MSR_IA32_LASTBRANCHFROMIP:
2584 case MSR_IA32_LASTBRANCHTOIP:
2585 case MSR_IA32_LASTINTFROMIP:
2586 case MSR_IA32_LASTINTTOIP:
2588 case MSR_K8_TSEG_ADDR:
2589 case MSR_K8_TSEG_MASK:
2591 case MSR_VM_HSAVE_PA:
2592 case MSR_K8_INT_PENDING_MSG:
2593 case MSR_AMD64_NB_CFG:
2594 case MSR_FAM10H_MMIO_CONF_BASE:
2595 case MSR_AMD64_BU_CFG2:
2596 case MSR_IA32_PERF_CTL:
2597 case MSR_AMD64_DC_CFG:
2598 case MSR_F15H_EX_CFG:
2601 case MSR_K7_EVNTSEL0 ... MSR_K7_EVNTSEL3:
2602 case MSR_K7_PERFCTR0 ... MSR_K7_PERFCTR3:
2603 case MSR_P6_PERFCTR0 ... MSR_P6_PERFCTR1:
2604 case MSR_P6_EVNTSEL0 ... MSR_P6_EVNTSEL1:
2605 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
2606 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data);
2609 case MSR_IA32_UCODE_REV:
2610 msr_info->data = vcpu->arch.microcode_version;
2612 case MSR_IA32_ARCH_CAPABILITIES:
2613 if (!msr_info->host_initiated &&
2614 !guest_cpuid_has(vcpu, X86_FEATURE_ARCH_CAPABILITIES))
2616 msr_info->data = vcpu->arch.arch_capabilities;
2619 case 0x200 ... 0x2ff:
2620 return kvm_mtrr_get_msr(vcpu, msr_info->index, &msr_info->data);
2621 case 0xcd: /* fsb frequency */
2625 * MSR_EBC_FREQUENCY_ID
2626 * Conservative value valid for even the basic CPU models.
2627 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
2628 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
2629 * and 266MHz for model 3, or 4. Set Core Clock
2630 * Frequency to System Bus Frequency Ratio to 1 (bits
2631 * 31:24) even though these are only valid for CPU
2632 * models > 2, however guests may end up dividing or
2633 * multiplying by zero otherwise.
2635 case MSR_EBC_FREQUENCY_ID:
2636 msr_info->data = 1 << 24;
2638 case MSR_IA32_APICBASE:
2639 msr_info->data = kvm_get_apic_base(vcpu);
2641 case APIC_BASE_MSR ... APIC_BASE_MSR + 0xff:
2642 return kvm_x2apic_msr_read(vcpu, msr_info->index, &msr_info->data);
2644 case MSR_IA32_TSCDEADLINE:
2645 msr_info->data = kvm_get_lapic_tscdeadline_msr(vcpu);
2647 case MSR_IA32_TSC_ADJUST:
2648 msr_info->data = (u64)vcpu->arch.ia32_tsc_adjust_msr;
2650 case MSR_IA32_MISC_ENABLE:
2651 msr_info->data = vcpu->arch.ia32_misc_enable_msr;
2653 case MSR_IA32_SMBASE:
2654 if (!msr_info->host_initiated)
2656 msr_info->data = vcpu->arch.smbase;
2658 case MSR_IA32_PERF_STATUS:
2659 /* TSC increment by tick */
2660 msr_info->data = 1000ULL;
2661 /* CPU multiplier */
2662 msr_info->data |= (((uint64_t)4ULL) << 40);
2665 msr_info->data = vcpu->arch.efer;
2667 case MSR_KVM_WALL_CLOCK:
2668 case MSR_KVM_WALL_CLOCK_NEW:
2669 msr_info->data = vcpu->kvm->arch.wall_clock;
2671 case MSR_KVM_SYSTEM_TIME:
2672 case MSR_KVM_SYSTEM_TIME_NEW:
2673 msr_info->data = vcpu->arch.time;
2675 case MSR_KVM_ASYNC_PF_EN:
2676 msr_info->data = vcpu->arch.apf.msr_val;
2678 case MSR_KVM_STEAL_TIME:
2679 msr_info->data = vcpu->arch.st.msr_val;
2681 case MSR_KVM_PV_EOI_EN:
2682 msr_info->data = vcpu->arch.pv_eoi.msr_val;
2684 case MSR_IA32_P5_MC_ADDR:
2685 case MSR_IA32_P5_MC_TYPE:
2686 case MSR_IA32_MCG_CAP:
2687 case MSR_IA32_MCG_CTL:
2688 case MSR_IA32_MCG_STATUS:
2689 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
2690 return get_msr_mce(vcpu, msr_info->index, &msr_info->data);
2691 case MSR_K7_CLK_CTL:
2693 * Provide expected ramp-up count for K7. All other
2694 * are set to zero, indicating minimum divisors for
2697 * This prevents guest kernels on AMD host with CPU
2698 * type 6, model 8 and higher from exploding due to
2699 * the rdmsr failing.
2701 msr_info->data = 0x20000000;
2703 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
2704 case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
2705 case HV_X64_MSR_CRASH_CTL:
2706 case HV_X64_MSR_STIMER0_CONFIG ... HV_X64_MSR_STIMER3_COUNT:
2707 return kvm_hv_get_msr_common(vcpu,
2708 msr_info->index, &msr_info->data);
2710 case MSR_IA32_BBL_CR_CTL3:
2711 /* This legacy MSR exists but isn't fully documented in current
2712 * silicon. It is however accessed by winxp in very narrow
2713 * scenarios where it sets bit #19, itself documented as
2714 * a "reserved" bit. Best effort attempt to source coherent
2715 * read data here should the balance of the register be
2716 * interpreted by the guest:
2718 * L2 cache control register 3: 64GB range, 256KB size,
2719 * enabled, latency 0x1, configured
2721 msr_info->data = 0xbe702111;
2723 case MSR_AMD64_OSVW_ID_LENGTH:
2724 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
2726 msr_info->data = vcpu->arch.osvw.length;
2728 case MSR_AMD64_OSVW_STATUS:
2729 if (!guest_cpuid_has(vcpu, X86_FEATURE_OSVW))
2731 msr_info->data = vcpu->arch.osvw.status;
2733 case MSR_PLATFORM_INFO:
2734 msr_info->data = vcpu->arch.msr_platform_info;
2736 case MSR_MISC_FEATURES_ENABLES:
2737 msr_info->data = vcpu->arch.msr_misc_features_enables;
2740 if (kvm_pmu_is_valid_msr(vcpu, msr_info->index))
2741 return kvm_pmu_get_msr(vcpu, msr_info->index, &msr_info->data);
2743 vcpu_debug_ratelimited(vcpu, "unhandled rdmsr: 0x%x\n",
2747 vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr_info->index);
2754 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
2757 * Read or write a bunch of msrs. All parameters are kernel addresses.
2759 * @return number of msrs set successfully.
2761 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2762 struct kvm_msr_entry *entries,
2763 int (*do_msr)(struct kvm_vcpu *vcpu,
2764 unsigned index, u64 *data))
2768 for (i = 0; i < msrs->nmsrs; ++i)
2769 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2776 * Read or write a bunch of msrs. Parameters are user addresses.
2778 * @return number of msrs set successfully.
2780 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2781 int (*do_msr)(struct kvm_vcpu *vcpu,
2782 unsigned index, u64 *data),
2785 struct kvm_msrs msrs;
2786 struct kvm_msr_entry *entries;
2791 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2795 if (msrs.nmsrs >= MAX_IO_MSRS)
2798 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
2799 entries = memdup_user(user_msrs->entries, size);
2800 if (IS_ERR(entries)) {
2801 r = PTR_ERR(entries);
2805 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2810 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2821 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
2826 case KVM_CAP_IRQCHIP:
2828 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
2829 case KVM_CAP_SET_TSS_ADDR:
2830 case KVM_CAP_EXT_CPUID:
2831 case KVM_CAP_EXT_EMUL_CPUID:
2832 case KVM_CAP_CLOCKSOURCE:
2834 case KVM_CAP_NOP_IO_DELAY:
2835 case KVM_CAP_MP_STATE:
2836 case KVM_CAP_SYNC_MMU:
2837 case KVM_CAP_USER_NMI:
2838 case KVM_CAP_REINJECT_CONTROL:
2839 case KVM_CAP_IRQ_INJECT_STATUS:
2840 case KVM_CAP_IOEVENTFD:
2841 case KVM_CAP_IOEVENTFD_NO_LENGTH:
2843 case KVM_CAP_PIT_STATE2:
2844 case KVM_CAP_SET_IDENTITY_MAP_ADDR:
2845 case KVM_CAP_XEN_HVM:
2846 case KVM_CAP_VCPU_EVENTS:
2847 case KVM_CAP_HYPERV:
2848 case KVM_CAP_HYPERV_VAPIC:
2849 case KVM_CAP_HYPERV_SPIN:
2850 case KVM_CAP_HYPERV_SYNIC:
2851 case KVM_CAP_HYPERV_SYNIC2:
2852 case KVM_CAP_HYPERV_VP_INDEX:
2853 case KVM_CAP_PCI_SEGMENT:
2854 case KVM_CAP_DEBUGREGS:
2855 case KVM_CAP_X86_ROBUST_SINGLESTEP:
2857 case KVM_CAP_ASYNC_PF:
2858 case KVM_CAP_GET_TSC_KHZ:
2859 case KVM_CAP_KVMCLOCK_CTRL:
2860 case KVM_CAP_READONLY_MEM:
2861 case KVM_CAP_HYPERV_TIME:
2862 case KVM_CAP_IOAPIC_POLARITY_IGNORED:
2863 case KVM_CAP_TSC_DEADLINE_TIMER:
2864 case KVM_CAP_ENABLE_CAP_VM:
2865 case KVM_CAP_DISABLE_QUIRKS:
2866 case KVM_CAP_SET_BOOT_CPU_ID:
2867 case KVM_CAP_SPLIT_IRQCHIP:
2868 case KVM_CAP_IMMEDIATE_EXIT:
2869 case KVM_CAP_GET_MSR_FEATURES:
2872 case KVM_CAP_ADJUST_CLOCK:
2873 r = KVM_CLOCK_TSC_STABLE;
2875 case KVM_CAP_X86_GUEST_MWAIT:
2876 r = kvm_mwait_in_guest();
2878 case KVM_CAP_X86_SMM:
2879 /* SMBASE is usually relocated above 1M on modern chipsets,
2880 * and SMM handlers might indeed rely on 4G segment limits,
2881 * so do not report SMM to be available if real mode is
2882 * emulated via vm86 mode. Still, do not go to great lengths
2883 * to avoid userspace's usage of the feature, because it is a
2884 * fringe case that is not enabled except via specific settings
2885 * of the module parameters.
2887 r = kvm_x86_ops->has_emulated_msr(MSR_IA32_SMBASE);
2890 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2892 case KVM_CAP_NR_VCPUS:
2893 r = KVM_SOFT_MAX_VCPUS;
2895 case KVM_CAP_MAX_VCPUS:
2898 case KVM_CAP_MAX_VCPU_ID:
2899 r = KVM_MAX_VCPU_ID;
2901 case KVM_CAP_NR_MEMSLOTS:
2902 r = KVM_USER_MEM_SLOTS;
2904 case KVM_CAP_PV_MMU: /* obsolete */
2908 r = KVM_MAX_MCE_BANKS;
2911 r = boot_cpu_has(X86_FEATURE_XSAVE);
2913 case KVM_CAP_TSC_CONTROL:
2914 r = kvm_has_tsc_control;
2916 case KVM_CAP_X2APIC_API:
2917 r = KVM_X2APIC_API_VALID_FLAGS;
2927 long kvm_arch_dev_ioctl(struct file *filp,
2928 unsigned int ioctl, unsigned long arg)
2930 void __user *argp = (void __user *)arg;
2934 case KVM_GET_MSR_INDEX_LIST: {
2935 struct kvm_msr_list __user *user_msr_list = argp;
2936 struct kvm_msr_list msr_list;
2940 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2943 msr_list.nmsrs = num_msrs_to_save + num_emulated_msrs;
2944 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2947 if (n < msr_list.nmsrs)
2950 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2951 num_msrs_to_save * sizeof(u32)))
2953 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
2955 num_emulated_msrs * sizeof(u32)))
2960 case KVM_GET_SUPPORTED_CPUID:
2961 case KVM_GET_EMULATED_CPUID: {
2962 struct kvm_cpuid2 __user *cpuid_arg = argp;
2963 struct kvm_cpuid2 cpuid;
2966 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2969 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries,
2975 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2980 case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2982 if (copy_to_user(argp, &kvm_mce_cap_supported,
2983 sizeof(kvm_mce_cap_supported)))
2987 case KVM_GET_MSR_FEATURE_INDEX_LIST: {
2988 struct kvm_msr_list __user *user_msr_list = argp;
2989 struct kvm_msr_list msr_list;
2993 if (copy_from_user(&msr_list, user_msr_list, sizeof(msr_list)))
2996 msr_list.nmsrs = num_msr_based_features;
2997 if (copy_to_user(user_msr_list, &msr_list, sizeof(msr_list)))
3000 if (n < msr_list.nmsrs)
3003 if (copy_to_user(user_msr_list->indices, &msr_based_features,
3004 num_msr_based_features * sizeof(u32)))
3010 r = msr_io(NULL, argp, do_get_msr_feature, 1);
3020 static void wbinvd_ipi(void *garbage)
3025 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
3027 return kvm_arch_has_noncoherent_dma(vcpu->kvm);
3030 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
3032 /* Address WBINVD may be executed by guest */
3033 if (need_emulate_wbinvd(vcpu)) {
3034 if (kvm_x86_ops->has_wbinvd_exit())
3035 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
3036 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
3037 smp_call_function_single(vcpu->cpu,
3038 wbinvd_ipi, NULL, 1);
3041 kvm_x86_ops->vcpu_load(vcpu, cpu);
3043 /* Apply any externally detected TSC adjustments (due to suspend) */
3044 if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
3045 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
3046 vcpu->arch.tsc_offset_adjustment = 0;
3047 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
3050 if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
3051 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
3052 rdtsc() - vcpu->arch.last_host_tsc;
3054 mark_tsc_unstable("KVM discovered backwards TSC");
3056 if (check_tsc_unstable()) {
3057 u64 offset = kvm_compute_tsc_offset(vcpu,
3058 vcpu->arch.last_guest_tsc);
3059 kvm_vcpu_write_tsc_offset(vcpu, offset);
3060 vcpu->arch.tsc_catchup = 1;
3063 if (kvm_lapic_hv_timer_in_use(vcpu))
3064 kvm_lapic_restart_hv_timer(vcpu);
3067 * On a host with synchronized TSC, there is no need to update
3068 * kvmclock on vcpu->cpu migration
3070 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1)
3071 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
3072 if (vcpu->cpu != cpu)
3073 kvm_make_request(KVM_REQ_MIGRATE_TIMER, vcpu);
3077 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
3080 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
3082 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
3085 if (vcpu->arch.st.steal.preempted)
3088 vcpu->arch.st.steal.preempted = 1;
3090 kvm_write_guest_offset_cached(vcpu->kvm, &vcpu->arch.st.stime,
3091 &vcpu->arch.st.steal.preempted,
3092 offsetof(struct kvm_steal_time, preempted),
3093 sizeof(vcpu->arch.st.steal.preempted));
3096 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
3100 if (vcpu->preempted)
3101 vcpu->arch.preempted_in_kernel = !kvm_x86_ops->get_cpl(vcpu);
3104 * Disable page faults because we're in atomic context here.
3105 * kvm_write_guest_offset_cached() would call might_fault()
3106 * that relies on pagefault_disable() to tell if there's a
3107 * bug. NOTE: the write to guest memory may not go through if
3108 * during postcopy live migration or if there's heavy guest
3111 pagefault_disable();
3113 * kvm_memslots() will be called by
3114 * kvm_write_guest_offset_cached() so take the srcu lock.
3116 idx = srcu_read_lock(&vcpu->kvm->srcu);
3117 kvm_steal_time_set_preempted(vcpu);
3118 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3120 kvm_x86_ops->vcpu_put(vcpu);
3121 vcpu->arch.last_host_tsc = rdtsc();
3123 * If userspace has set any breakpoints or watchpoints, dr6 is restored
3124 * on every vmexit, but if not, we might have a stale dr6 from the
3125 * guest. do_debug expects dr6 to be cleared after it runs, do the same.
3130 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
3131 struct kvm_lapic_state *s)
3133 if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
3134 kvm_x86_ops->sync_pir_to_irr(vcpu);
3136 return kvm_apic_get_state(vcpu, s);
3139 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
3140 struct kvm_lapic_state *s)
3144 r = kvm_apic_set_state(vcpu, s);
3147 update_cr8_intercept(vcpu);
3152 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu *vcpu)
3154 return (!lapic_in_kernel(vcpu) ||
3155 kvm_apic_accept_pic_intr(vcpu));
3159 * if userspace requested an interrupt window, check that the
3160 * interrupt window is open.
3162 * No need to exit to userspace if we already have an interrupt queued.
3164 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu *vcpu)
3166 return kvm_arch_interrupt_allowed(vcpu) &&
3167 !kvm_cpu_has_interrupt(vcpu) &&
3168 !kvm_event_needs_reinjection(vcpu) &&
3169 kvm_cpu_accept_dm_intr(vcpu);
3172 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
3173 struct kvm_interrupt *irq)
3175 if (irq->irq >= KVM_NR_INTERRUPTS)
3178 if (!irqchip_in_kernel(vcpu->kvm)) {
3179 kvm_queue_interrupt(vcpu, irq->irq, false);
3180 kvm_make_request(KVM_REQ_EVENT, vcpu);
3185 * With in-kernel LAPIC, we only use this to inject EXTINT, so
3186 * fail for in-kernel 8259.
3188 if (pic_in_kernel(vcpu->kvm))
3191 if (vcpu->arch.pending_external_vector != -1)
3194 vcpu->arch.pending_external_vector = irq->irq;
3195 kvm_make_request(KVM_REQ_EVENT, vcpu);
3199 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
3201 kvm_inject_nmi(vcpu);
3206 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu *vcpu)
3208 kvm_make_request(KVM_REQ_SMI, vcpu);
3213 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
3214 struct kvm_tpr_access_ctl *tac)
3218 vcpu->arch.tpr_access_reporting = !!tac->enabled;
3222 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
3226 unsigned bank_num = mcg_cap & 0xff, bank;
3229 if (!bank_num || bank_num > KVM_MAX_MCE_BANKS)
3231 if (mcg_cap & ~(kvm_mce_cap_supported | 0xff | 0xff0000))
3234 vcpu->arch.mcg_cap = mcg_cap;
3235 /* Init IA32_MCG_CTL to all 1s */
3236 if (mcg_cap & MCG_CTL_P)
3237 vcpu->arch.mcg_ctl = ~(u64)0;
3238 /* Init IA32_MCi_CTL to all 1s */
3239 for (bank = 0; bank < bank_num; bank++)
3240 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
3242 if (kvm_x86_ops->setup_mce)
3243 kvm_x86_ops->setup_mce(vcpu);
3248 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
3249 struct kvm_x86_mce *mce)
3251 u64 mcg_cap = vcpu->arch.mcg_cap;
3252 unsigned bank_num = mcg_cap & 0xff;
3253 u64 *banks = vcpu->arch.mce_banks;
3255 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
3258 * if IA32_MCG_CTL is not all 1s, the uncorrected error
3259 * reporting is disabled
3261 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
3262 vcpu->arch.mcg_ctl != ~(u64)0)
3264 banks += 4 * mce->bank;
3266 * if IA32_MCi_CTL is not all 1s, the uncorrected error
3267 * reporting is disabled for the bank
3269 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
3271 if (mce->status & MCI_STATUS_UC) {
3272 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
3273 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
3274 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
3277 if (banks[1] & MCI_STATUS_VAL)
3278 mce->status |= MCI_STATUS_OVER;
3279 banks[2] = mce->addr;
3280 banks[3] = mce->misc;
3281 vcpu->arch.mcg_status = mce->mcg_status;
3282 banks[1] = mce->status;
3283 kvm_queue_exception(vcpu, MC_VECTOR);
3284 } else if (!(banks[1] & MCI_STATUS_VAL)
3285 || !(banks[1] & MCI_STATUS_UC)) {
3286 if (banks[1] & MCI_STATUS_VAL)
3287 mce->status |= MCI_STATUS_OVER;
3288 banks[2] = mce->addr;
3289 banks[3] = mce->misc;
3290 banks[1] = mce->status;
3292 banks[1] |= MCI_STATUS_OVER;
3296 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
3297 struct kvm_vcpu_events *events)
3301 if (kvm_check_request(KVM_REQ_SMI, vcpu))
3305 * FIXME: pass injected and pending separately. This is only
3306 * needed for nested virtualization, whose state cannot be
3307 * migrated yet. For now we can combine them.
3309 events->exception.injected =
3310 (vcpu->arch.exception.pending ||
3311 vcpu->arch.exception.injected) &&
3312 !kvm_exception_is_soft(vcpu->arch.exception.nr);
3313 events->exception.nr = vcpu->arch.exception.nr;
3314 events->exception.has_error_code = vcpu->arch.exception.has_error_code;
3315 events->exception.pad = 0;
3316 events->exception.error_code = vcpu->arch.exception.error_code;
3318 events->interrupt.injected =
3319 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
3320 events->interrupt.nr = vcpu->arch.interrupt.nr;
3321 events->interrupt.soft = 0;
3322 events->interrupt.shadow = kvm_x86_ops->get_interrupt_shadow(vcpu);
3324 events->nmi.injected = vcpu->arch.nmi_injected;
3325 events->nmi.pending = vcpu->arch.nmi_pending != 0;
3326 events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
3327 events->nmi.pad = 0;
3329 events->sipi_vector = 0; /* never valid when reporting to user space */
3331 events->smi.smm = is_smm(vcpu);
3332 events->smi.pending = vcpu->arch.smi_pending;
3333 events->smi.smm_inside_nmi =
3334 !!(vcpu->arch.hflags & HF_SMM_INSIDE_NMI_MASK);
3335 events->smi.latched_init = kvm_lapic_latched_init(vcpu);
3337 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
3338 | KVM_VCPUEVENT_VALID_SHADOW
3339 | KVM_VCPUEVENT_VALID_SMM);
3340 memset(&events->reserved, 0, sizeof(events->reserved));
3343 static void kvm_set_hflags(struct kvm_vcpu *vcpu, unsigned emul_flags);
3345 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
3346 struct kvm_vcpu_events *events)
3348 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
3349 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
3350 | KVM_VCPUEVENT_VALID_SHADOW
3351 | KVM_VCPUEVENT_VALID_SMM))
3354 if (events->exception.injected &&
3355 (events->exception.nr > 31 || events->exception.nr == NMI_VECTOR ||
3356 is_guest_mode(vcpu)))
3359 /* INITs are latched while in SMM */
3360 if (events->flags & KVM_VCPUEVENT_VALID_SMM &&
3361 (events->smi.smm || events->smi.pending) &&
3362 vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED)
3366 vcpu->arch.exception.injected = false;
3367 vcpu->arch.exception.pending = events->exception.injected;
3368 vcpu->arch.exception.nr = events->exception.nr;
3369 vcpu->arch.exception.has_error_code = events->exception.has_error_code;
3370 vcpu->arch.exception.error_code = events->exception.error_code;
3372 vcpu->arch.interrupt.pending = events->interrupt.injected;
3373 vcpu->arch.interrupt.nr = events->interrupt.nr;
3374 vcpu->arch.interrupt.soft = events->interrupt.soft;
3375 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
3376 kvm_x86_ops->set_interrupt_shadow(vcpu,
3377 events->interrupt.shadow);
3379 vcpu->arch.nmi_injected = events->nmi.injected;
3380 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
3381 vcpu->arch.nmi_pending = events->nmi.pending;
3382 kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
3384 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR &&
3385 lapic_in_kernel(vcpu))
3386 vcpu->arch.apic->sipi_vector = events->sipi_vector;
3388 if (events->flags & KVM_VCPUEVENT_VALID_SMM) {
3389 u32 hflags = vcpu->arch.hflags;
3390 if (events->smi.smm)
3391 hflags |= HF_SMM_MASK;
3393 hflags &= ~HF_SMM_MASK;
3394 kvm_set_hflags(vcpu, hflags);
3396 vcpu->arch.smi_pending = events->smi.pending;
3398 if (events->smi.smm) {
3399 if (events->smi.smm_inside_nmi)
3400 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
3402 vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK;
3403 if (lapic_in_kernel(vcpu)) {
3404 if (events->smi.latched_init)
3405 set_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
3407 clear_bit(KVM_APIC_INIT, &vcpu->arch.apic->pending_events);
3412 kvm_make_request(KVM_REQ_EVENT, vcpu);
3417 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
3418 struct kvm_debugregs *dbgregs)
3422 memset(dbgregs, 0, sizeof(*dbgregs));
3423 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
3424 kvm_get_dr(vcpu, 6, &val);
3426 dbgregs->dr7 = vcpu->arch.dr7;
3429 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
3430 struct kvm_debugregs *dbgregs)
3435 if (dbgregs->dr6 & ~0xffffffffull)
3437 if (dbgregs->dr7 & ~0xffffffffull)
3440 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
3441 kvm_update_dr0123(vcpu);
3442 vcpu->arch.dr6 = dbgregs->dr6;
3443 kvm_update_dr6(vcpu);
3444 vcpu->arch.dr7 = dbgregs->dr7;
3445 kvm_update_dr7(vcpu);
3450 #define XSTATE_COMPACTION_ENABLED (1ULL << 63)
3452 static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu)
3454 struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave;
3455 u64 xstate_bv = xsave->header.xfeatures;
3459 * Copy legacy XSAVE area, to avoid complications with CPUID
3460 * leaves 0 and 1 in the loop below.
3462 memcpy(dest, xsave, XSAVE_HDR_OFFSET);
3465 xstate_bv &= vcpu->arch.guest_supported_xcr0 | XFEATURE_MASK_FPSSE;
3466 *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv;
3469 * Copy each region from the possibly compacted offset to the
3470 * non-compacted offset.
3472 valid = xstate_bv & ~XFEATURE_MASK_FPSSE;
3474 u64 feature = valid & -valid;
3475 int index = fls64(feature) - 1;
3476 void *src = get_xsave_addr(xsave, feature);
3479 u32 size, offset, ecx, edx;
3480 cpuid_count(XSTATE_CPUID, index,
3481 &size, &offset, &ecx, &edx);
3482 if (feature == XFEATURE_MASK_PKRU)
3483 memcpy(dest + offset, &vcpu->arch.pkru,
3484 sizeof(vcpu->arch.pkru));
3486 memcpy(dest + offset, src, size);
3494 static void load_xsave(struct kvm_vcpu *vcpu, u8 *src)
3496 struct xregs_state *xsave = &vcpu->arch.guest_fpu.state.xsave;
3497 u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET);
3501 * Copy legacy XSAVE area, to avoid complications with CPUID
3502 * leaves 0 and 1 in the loop below.
3504 memcpy(xsave, src, XSAVE_HDR_OFFSET);
3506 /* Set XSTATE_BV and possibly XCOMP_BV. */
3507 xsave->header.xfeatures = xstate_bv;
3508 if (boot_cpu_has(X86_FEATURE_XSAVES))
3509 xsave->header.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED;
3512 * Copy each region from the non-compacted offset to the
3513 * possibly compacted offset.
3515 valid = xstate_bv & ~XFEATURE_MASK_FPSSE;
3517 u64 feature = valid & -valid;
3518 int index = fls64(feature) - 1;
3519 void *dest = get_xsave_addr(xsave, feature);
3522 u32 size, offset, ecx, edx;
3523 cpuid_count(XSTATE_CPUID, index,
3524 &size, &offset, &ecx, &edx);
3525 if (feature == XFEATURE_MASK_PKRU)
3526 memcpy(&vcpu->arch.pkru, src + offset,
3527 sizeof(vcpu->arch.pkru));
3529 memcpy(dest, src + offset, size);
3536 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
3537 struct kvm_xsave *guest_xsave)
3539 if (boot_cpu_has(X86_FEATURE_XSAVE)) {
3540 memset(guest_xsave, 0, sizeof(struct kvm_xsave));
3541 fill_xsave((u8 *) guest_xsave->region, vcpu);
3543 memcpy(guest_xsave->region,
3544 &vcpu->arch.guest_fpu.state.fxsave,
3545 sizeof(struct fxregs_state));
3546 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
3547 XFEATURE_MASK_FPSSE;
3551 #define XSAVE_MXCSR_OFFSET 24
3553 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
3554 struct kvm_xsave *guest_xsave)
3557 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
3558 u32 mxcsr = *(u32 *)&guest_xsave->region[XSAVE_MXCSR_OFFSET / sizeof(u32)];
3560 if (boot_cpu_has(X86_FEATURE_XSAVE)) {
3562 * Here we allow setting states that are not present in
3563 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility
3564 * with old userspace.
3566 if (xstate_bv & ~kvm_supported_xcr0() ||
3567 mxcsr & ~mxcsr_feature_mask)
3569 load_xsave(vcpu, (u8 *)guest_xsave->region);
3571 if (xstate_bv & ~XFEATURE_MASK_FPSSE ||
3572 mxcsr & ~mxcsr_feature_mask)
3574 memcpy(&vcpu->arch.guest_fpu.state.fxsave,
3575 guest_xsave->region, sizeof(struct fxregs_state));
3580 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
3581 struct kvm_xcrs *guest_xcrs)
3583 if (!boot_cpu_has(X86_FEATURE_XSAVE)) {
3584 guest_xcrs->nr_xcrs = 0;
3588 guest_xcrs->nr_xcrs = 1;
3589 guest_xcrs->flags = 0;
3590 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
3591 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
3594 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
3595 struct kvm_xcrs *guest_xcrs)
3599 if (!boot_cpu_has(X86_FEATURE_XSAVE))
3602 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
3605 for (i = 0; i < guest_xcrs->nr_xcrs; i++)
3606 /* Only support XCR0 currently */
3607 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) {
3608 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
3609 guest_xcrs->xcrs[i].value);
3618 * kvm_set_guest_paused() indicates to the guest kernel that it has been
3619 * stopped by the hypervisor. This function will be called from the host only.
3620 * EINVAL is returned when the host attempts to set the flag for a guest that
3621 * does not support pv clocks.
3623 static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
3625 if (!vcpu->arch.pv_time_enabled)
3627 vcpu->arch.pvclock_set_guest_stopped_request = true;
3628 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
3632 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
3633 struct kvm_enable_cap *cap)
3639 case KVM_CAP_HYPERV_SYNIC2:
3642 case KVM_CAP_HYPERV_SYNIC:
3643 if (!irqchip_in_kernel(vcpu->kvm))
3645 return kvm_hv_activate_synic(vcpu, cap->cap ==
3646 KVM_CAP_HYPERV_SYNIC2);
3652 long kvm_arch_vcpu_ioctl(struct file *filp,
3653 unsigned int ioctl, unsigned long arg)
3655 struct kvm_vcpu *vcpu = filp->private_data;
3656 void __user *argp = (void __user *)arg;
3659 struct kvm_lapic_state *lapic;
3660 struct kvm_xsave *xsave;
3661 struct kvm_xcrs *xcrs;
3667 case KVM_GET_LAPIC: {
3669 if (!lapic_in_kernel(vcpu))
3671 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
3676 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
3680 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
3685 case KVM_SET_LAPIC: {
3687 if (!lapic_in_kernel(vcpu))
3689 u.lapic = memdup_user(argp, sizeof(*u.lapic));
3690 if (IS_ERR(u.lapic))
3691 return PTR_ERR(u.lapic);
3693 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
3696 case KVM_INTERRUPT: {
3697 struct kvm_interrupt irq;
3700 if (copy_from_user(&irq, argp, sizeof irq))
3702 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
3706 r = kvm_vcpu_ioctl_nmi(vcpu);
3710 r = kvm_vcpu_ioctl_smi(vcpu);
3713 case KVM_SET_CPUID: {
3714 struct kvm_cpuid __user *cpuid_arg = argp;
3715 struct kvm_cpuid cpuid;
3718 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3720 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
3723 case KVM_SET_CPUID2: {
3724 struct kvm_cpuid2 __user *cpuid_arg = argp;
3725 struct kvm_cpuid2 cpuid;
3728 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3730 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
3731 cpuid_arg->entries);
3734 case KVM_GET_CPUID2: {
3735 struct kvm_cpuid2 __user *cpuid_arg = argp;
3736 struct kvm_cpuid2 cpuid;
3739 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3741 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
3742 cpuid_arg->entries);
3746 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
3751 case KVM_GET_MSRS: {
3752 int idx = srcu_read_lock(&vcpu->kvm->srcu);
3753 r = msr_io(vcpu, argp, do_get_msr, 1);
3754 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3757 case KVM_SET_MSRS: {
3758 int idx = srcu_read_lock(&vcpu->kvm->srcu);
3759 r = msr_io(vcpu, argp, do_set_msr, 0);
3760 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3763 case KVM_TPR_ACCESS_REPORTING: {
3764 struct kvm_tpr_access_ctl tac;
3767 if (copy_from_user(&tac, argp, sizeof tac))
3769 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
3773 if (copy_to_user(argp, &tac, sizeof tac))
3778 case KVM_SET_VAPIC_ADDR: {
3779 struct kvm_vapic_addr va;
3783 if (!lapic_in_kernel(vcpu))
3786 if (copy_from_user(&va, argp, sizeof va))
3788 idx = srcu_read_lock(&vcpu->kvm->srcu);
3789 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
3790 srcu_read_unlock(&vcpu->kvm->srcu, idx);
3793 case KVM_X86_SETUP_MCE: {
3797 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
3799 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
3802 case KVM_X86_SET_MCE: {
3803 struct kvm_x86_mce mce;
3806 if (copy_from_user(&mce, argp, sizeof mce))
3808 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
3811 case KVM_GET_VCPU_EVENTS: {
3812 struct kvm_vcpu_events events;
3814 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
3817 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
3822 case KVM_SET_VCPU_EVENTS: {
3823 struct kvm_vcpu_events events;
3826 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
3829 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
3832 case KVM_GET_DEBUGREGS: {
3833 struct kvm_debugregs dbgregs;
3835 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
3838 if (copy_to_user(argp, &dbgregs,
3839 sizeof(struct kvm_debugregs)))
3844 case KVM_SET_DEBUGREGS: {
3845 struct kvm_debugregs dbgregs;
3848 if (copy_from_user(&dbgregs, argp,
3849 sizeof(struct kvm_debugregs)))
3852 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
3855 case KVM_GET_XSAVE: {
3856 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
3861 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
3864 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
3869 case KVM_SET_XSAVE: {
3870 u.xsave = memdup_user(argp, sizeof(*u.xsave));
3871 if (IS_ERR(u.xsave))
3872 return PTR_ERR(u.xsave);
3874 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
3877 case KVM_GET_XCRS: {
3878 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
3883 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
3886 if (copy_to_user(argp, u.xcrs,
3887 sizeof(struct kvm_xcrs)))
3892 case KVM_SET_XCRS: {
3893 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
3895 return PTR_ERR(u.xcrs);
3897 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
3900 case KVM_SET_TSC_KHZ: {
3904 user_tsc_khz = (u32)arg;
3906 if (user_tsc_khz >= kvm_max_guest_tsc_khz)
3909 if (user_tsc_khz == 0)
3910 user_tsc_khz = tsc_khz;
3912 if (!kvm_set_tsc_khz(vcpu, user_tsc_khz))
3917 case KVM_GET_TSC_KHZ: {
3918 r = vcpu->arch.virtual_tsc_khz;
3921 case KVM_KVMCLOCK_CTRL: {
3922 r = kvm_set_guest_paused(vcpu);
3925 case KVM_ENABLE_CAP: {
3926 struct kvm_enable_cap cap;
3929 if (copy_from_user(&cap, argp, sizeof(cap)))
3931 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
3942 int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
3944 return VM_FAULT_SIGBUS;
3947 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
3951 if (addr > (unsigned int)(-3 * PAGE_SIZE))
3953 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
3957 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
3960 kvm->arch.ept_identity_map_addr = ident_addr;
3964 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
3965 u32 kvm_nr_mmu_pages)
3967 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
3970 mutex_lock(&kvm->slots_lock);
3972 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
3973 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
3975 mutex_unlock(&kvm->slots_lock);
3979 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
3981 return kvm->arch.n_max_mmu_pages;
3984 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3986 struct kvm_pic *pic = kvm->arch.vpic;
3990 switch (chip->chip_id) {
3991 case KVM_IRQCHIP_PIC_MASTER:
3992 memcpy(&chip->chip.pic, &pic->pics[0],
3993 sizeof(struct kvm_pic_state));
3995 case KVM_IRQCHIP_PIC_SLAVE:
3996 memcpy(&chip->chip.pic, &pic->pics[1],
3997 sizeof(struct kvm_pic_state));
3999 case KVM_IRQCHIP_IOAPIC:
4000 kvm_get_ioapic(kvm, &chip->chip.ioapic);
4009 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
4011 struct kvm_pic *pic = kvm->arch.vpic;
4015 switch (chip->chip_id) {
4016 case KVM_IRQCHIP_PIC_MASTER:
4017 spin_lock(&pic->lock);
4018 memcpy(&pic->pics[0], &chip->chip.pic,
4019 sizeof(struct kvm_pic_state));
4020 spin_unlock(&pic->lock);
4022 case KVM_IRQCHIP_PIC_SLAVE:
4023 spin_lock(&pic->lock);
4024 memcpy(&pic->pics[1], &chip->chip.pic,
4025 sizeof(struct kvm_pic_state));
4026 spin_unlock(&pic->lock);
4028 case KVM_IRQCHIP_IOAPIC:
4029 kvm_set_ioapic(kvm, &chip->chip.ioapic);
4035 kvm_pic_update_irq(pic);
4039 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
4041 struct kvm_kpit_state *kps = &kvm->arch.vpit->pit_state;
4043 BUILD_BUG_ON(sizeof(*ps) != sizeof(kps->channels));
4045 mutex_lock(&kps->lock);
4046 memcpy(ps, &kps->channels, sizeof(*ps));
4047 mutex_unlock(&kps->lock);
4051 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
4054 struct kvm_pit *pit = kvm->arch.vpit;
4056 mutex_lock(&pit->pit_state.lock);
4057 memcpy(&pit->pit_state.channels, ps, sizeof(*ps));
4058 for (i = 0; i < 3; i++)
4059 kvm_pit_load_count(pit, i, ps->channels[i].count, 0);
4060 mutex_unlock(&pit->pit_state.lock);
4064 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
4066 mutex_lock(&kvm->arch.vpit->pit_state.lock);
4067 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
4068 sizeof(ps->channels));
4069 ps->flags = kvm->arch.vpit->pit_state.flags;
4070 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
4071 memset(&ps->reserved, 0, sizeof(ps->reserved));
4075 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
4079 u32 prev_legacy, cur_legacy;
4080 struct kvm_pit *pit = kvm->arch.vpit;
4082 mutex_lock(&pit->pit_state.lock);
4083 prev_legacy = pit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
4084 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
4085 if (!prev_legacy && cur_legacy)
4087 memcpy(&pit->pit_state.channels, &ps->channels,
4088 sizeof(pit->pit_state.channels));
4089 pit->pit_state.flags = ps->flags;
4090 for (i = 0; i < 3; i++)
4091 kvm_pit_load_count(pit, i, pit->pit_state.channels[i].count,
4093 mutex_unlock(&pit->pit_state.lock);
4097 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
4098 struct kvm_reinject_control *control)
4100 struct kvm_pit *pit = kvm->arch.vpit;
4105 /* pit->pit_state.lock was overloaded to prevent userspace from getting
4106 * an inconsistent state after running multiple KVM_REINJECT_CONTROL
4107 * ioctls in parallel. Use a separate lock if that ioctl isn't rare.
4109 mutex_lock(&pit->pit_state.lock);
4110 kvm_pit_set_reinject(pit, control->pit_reinject);
4111 mutex_unlock(&pit->pit_state.lock);
4117 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
4118 * @kvm: kvm instance
4119 * @log: slot id and address to which we copy the log
4121 * Steps 1-4 below provide general overview of dirty page logging. See
4122 * kvm_get_dirty_log_protect() function description for additional details.
4124 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
4125 * always flush the TLB (step 4) even if previous step failed and the dirty
4126 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
4127 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
4128 * writes will be marked dirty for next log read.
4130 * 1. Take a snapshot of the bit and clear it if needed.
4131 * 2. Write protect the corresponding page.
4132 * 3. Copy the snapshot to the userspace.
4133 * 4. Flush TLB's if needed.
4135 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
4137 bool is_dirty = false;
4140 mutex_lock(&kvm->slots_lock);
4143 * Flush potentially hardware-cached dirty pages to dirty_bitmap.
4145 if (kvm_x86_ops->flush_log_dirty)
4146 kvm_x86_ops->flush_log_dirty(kvm);
4148 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
4151 * All the TLBs can be flushed out of mmu lock, see the comments in
4152 * kvm_mmu_slot_remove_write_access().
4154 lockdep_assert_held(&kvm->slots_lock);
4156 kvm_flush_remote_tlbs(kvm);
4158 mutex_unlock(&kvm->slots_lock);
4162 int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
4165 if (!irqchip_in_kernel(kvm))
4168 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
4169 irq_event->irq, irq_event->level,
4174 static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
4175 struct kvm_enable_cap *cap)
4183 case KVM_CAP_DISABLE_QUIRKS:
4184 kvm->arch.disabled_quirks = cap->args[0];
4187 case KVM_CAP_SPLIT_IRQCHIP: {
4188 mutex_lock(&kvm->lock);
4190 if (cap->args[0] > MAX_NR_RESERVED_IOAPIC_PINS)
4191 goto split_irqchip_unlock;
4193 if (irqchip_in_kernel(kvm))
4194 goto split_irqchip_unlock;
4195 if (kvm->created_vcpus)
4196 goto split_irqchip_unlock;
4197 r = kvm_setup_empty_irq_routing(kvm);
4199 goto split_irqchip_unlock;
4200 /* Pairs with irqchip_in_kernel. */
4202 kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
4203 kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
4205 split_irqchip_unlock:
4206 mutex_unlock(&kvm->lock);
4209 case KVM_CAP_X2APIC_API:
4211 if (cap->args[0] & ~KVM_X2APIC_API_VALID_FLAGS)
4214 if (cap->args[0] & KVM_X2APIC_API_USE_32BIT_IDS)
4215 kvm->arch.x2apic_format = true;
4216 if (cap->args[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK)
4217 kvm->arch.x2apic_broadcast_quirk_disabled = true;
4228 long kvm_arch_vm_ioctl(struct file *filp,
4229 unsigned int ioctl, unsigned long arg)
4231 struct kvm *kvm = filp->private_data;
4232 void __user *argp = (void __user *)arg;
4235 * This union makes it completely explicit to gcc-3.x
4236 * that these two variables' stack usage should be
4237 * combined, not added together.
4240 struct kvm_pit_state ps;
4241 struct kvm_pit_state2 ps2;
4242 struct kvm_pit_config pit_config;
4246 case KVM_SET_TSS_ADDR:
4247 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
4249 case KVM_SET_IDENTITY_MAP_ADDR: {
4253 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
4255 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
4258 case KVM_SET_NR_MMU_PAGES:
4259 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
4261 case KVM_GET_NR_MMU_PAGES:
4262 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
4264 case KVM_CREATE_IRQCHIP: {
4265 mutex_lock(&kvm->lock);
4268 if (irqchip_in_kernel(kvm))
4269 goto create_irqchip_unlock;
4272 if (kvm->created_vcpus)
4273 goto create_irqchip_unlock;
4275 r = kvm_pic_init(kvm);
4277 goto create_irqchip_unlock;
4279 r = kvm_ioapic_init(kvm);
4281 kvm_pic_destroy(kvm);
4282 goto create_irqchip_unlock;
4285 r = kvm_setup_default_irq_routing(kvm);
4287 kvm_ioapic_destroy(kvm);
4288 kvm_pic_destroy(kvm);
4289 goto create_irqchip_unlock;
4291 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */
4293 kvm->arch.irqchip_mode = KVM_IRQCHIP_KERNEL;
4294 create_irqchip_unlock:
4295 mutex_unlock(&kvm->lock);
4298 case KVM_CREATE_PIT:
4299 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
4301 case KVM_CREATE_PIT2:
4303 if (copy_from_user(&u.pit_config, argp,
4304 sizeof(struct kvm_pit_config)))
4307 mutex_lock(&kvm->lock);
4310 goto create_pit_unlock;
4312 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
4316 mutex_unlock(&kvm->lock);
4318 case KVM_GET_IRQCHIP: {
4319 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
4320 struct kvm_irqchip *chip;
4322 chip = memdup_user(argp, sizeof(*chip));
4329 if (!irqchip_kernel(kvm))
4330 goto get_irqchip_out;
4331 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
4333 goto get_irqchip_out;
4335 if (copy_to_user(argp, chip, sizeof *chip))
4336 goto get_irqchip_out;
4342 case KVM_SET_IRQCHIP: {
4343 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
4344 struct kvm_irqchip *chip;
4346 chip = memdup_user(argp, sizeof(*chip));
4353 if (!irqchip_kernel(kvm))
4354 goto set_irqchip_out;
4355 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
4357 goto set_irqchip_out;
4365 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
4368 if (!kvm->arch.vpit)
4370 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
4374 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
4381 if (copy_from_user(&u.ps, argp, sizeof u.ps))
4383 mutex_lock(&kvm->lock);
4385 if (!kvm->arch.vpit)
4387 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
4389 mutex_unlock(&kvm->lock);
4392 case KVM_GET_PIT2: {
4394 if (!kvm->arch.vpit)
4396 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
4400 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
4405 case KVM_SET_PIT2: {
4407 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
4409 mutex_lock(&kvm->lock);
4411 if (!kvm->arch.vpit)
4413 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
4415 mutex_unlock(&kvm->lock);
4418 case KVM_REINJECT_CONTROL: {
4419 struct kvm_reinject_control control;
4421 if (copy_from_user(&control, argp, sizeof(control)))
4423 r = kvm_vm_ioctl_reinject(kvm, &control);
4426 case KVM_SET_BOOT_CPU_ID:
4428 mutex_lock(&kvm->lock);
4429 if (kvm->created_vcpus)
4432 kvm->arch.bsp_vcpu_id = arg;
4433 mutex_unlock(&kvm->lock);
4435 case KVM_XEN_HVM_CONFIG: {
4436 struct kvm_xen_hvm_config xhc;
4438 if (copy_from_user(&xhc, argp, sizeof(xhc)))
4443 memcpy(&kvm->arch.xen_hvm_config, &xhc, sizeof(xhc));
4447 case KVM_SET_CLOCK: {
4448 struct kvm_clock_data user_ns;
4452 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
4461 * TODO: userspace has to take care of races with VCPU_RUN, so
4462 * kvm_gen_update_masterclock() can be cut down to locked
4463 * pvclock_update_vm_gtod_copy().
4465 kvm_gen_update_masterclock(kvm);
4466 now_ns = get_kvmclock_ns(kvm);
4467 kvm->arch.kvmclock_offset += user_ns.clock - now_ns;
4468 kvm_make_all_cpus_request(kvm, KVM_REQ_CLOCK_UPDATE);
4471 case KVM_GET_CLOCK: {
4472 struct kvm_clock_data user_ns;
4475 now_ns = get_kvmclock_ns(kvm);
4476 user_ns.clock = now_ns;
4477 user_ns.flags = kvm->arch.use_master_clock ? KVM_CLOCK_TSC_STABLE : 0;
4478 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
4481 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
4486 case KVM_ENABLE_CAP: {
4487 struct kvm_enable_cap cap;
4490 if (copy_from_user(&cap, argp, sizeof(cap)))
4492 r = kvm_vm_ioctl_enable_cap(kvm, &cap);
4502 static void kvm_init_msr_list(void)
4507 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
4508 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
4512 * Even MSRs that are valid in the host may not be exposed
4513 * to the guests in some cases.
4515 switch (msrs_to_save[i]) {
4516 case MSR_IA32_BNDCFGS:
4517 if (!kvm_x86_ops->mpx_supported())
4521 if (!kvm_x86_ops->rdtscp_supported())
4529 msrs_to_save[j] = msrs_to_save[i];
4532 num_msrs_to_save = j;
4534 for (i = j = 0; i < ARRAY_SIZE(emulated_msrs); i++) {
4535 if (!kvm_x86_ops->has_emulated_msr(emulated_msrs[i]))
4539 emulated_msrs[j] = emulated_msrs[i];
4542 num_emulated_msrs = j;
4544 for (i = j = 0; i < ARRAY_SIZE(msr_based_features); i++) {
4545 struct kvm_msr_entry msr;
4547 msr.index = msr_based_features[i];
4548 if (kvm_get_msr_feature(&msr))
4552 msr_based_features[j] = msr_based_features[i];
4555 num_msr_based_features = j;
4558 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
4566 if (!(lapic_in_kernel(vcpu) &&
4567 !kvm_iodevice_write(vcpu, &vcpu->arch.apic->dev, addr, n, v))
4568 && kvm_io_bus_write(vcpu, KVM_MMIO_BUS, addr, n, v))
4579 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
4586 if (!(lapic_in_kernel(vcpu) &&
4587 !kvm_iodevice_read(vcpu, &vcpu->arch.apic->dev,
4589 && kvm_io_bus_read(vcpu, KVM_MMIO_BUS, addr, n, v))
4591 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, v);
4601 static void kvm_set_segment(struct kvm_vcpu *vcpu,
4602 struct kvm_segment *var, int seg)
4604 kvm_x86_ops->set_segment(vcpu, var, seg);
4607 void kvm_get_segment(struct kvm_vcpu *vcpu,
4608 struct kvm_segment *var, int seg)
4610 kvm_x86_ops->get_segment(vcpu, var, seg);
4613 gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
4614 struct x86_exception *exception)
4618 BUG_ON(!mmu_is_nested(vcpu));
4620 /* NPT walks are always user-walks */
4621 access |= PFERR_USER_MASK;
4622 t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, exception);
4627 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
4628 struct x86_exception *exception)
4630 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4631 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
4634 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
4635 struct x86_exception *exception)
4637 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4638 access |= PFERR_FETCH_MASK;
4639 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
4642 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
4643 struct x86_exception *exception)
4645 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4646 access |= PFERR_WRITE_MASK;
4647 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
4650 /* uses this to access any guest's mapped memory without checking CPL */
4651 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
4652 struct x86_exception *exception)
4654 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
4657 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
4658 struct kvm_vcpu *vcpu, u32 access,
4659 struct x86_exception *exception)
4662 int r = X86EMUL_CONTINUE;
4665 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
4667 unsigned offset = addr & (PAGE_SIZE-1);
4668 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
4671 if (gpa == UNMAPPED_GVA)
4672 return X86EMUL_PROPAGATE_FAULT;
4673 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, data,
4676 r = X86EMUL_IO_NEEDED;
4688 /* used for instruction fetching */
4689 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
4690 gva_t addr, void *val, unsigned int bytes,
4691 struct x86_exception *exception)
4693 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4694 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4698 /* Inline kvm_read_guest_virt_helper for speed. */
4699 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK,
4701 if (unlikely(gpa == UNMAPPED_GVA))
4702 return X86EMUL_PROPAGATE_FAULT;
4704 offset = addr & (PAGE_SIZE-1);
4705 if (WARN_ON(offset + bytes > PAGE_SIZE))
4706 bytes = (unsigned)PAGE_SIZE - offset;
4707 ret = kvm_vcpu_read_guest_page(vcpu, gpa >> PAGE_SHIFT, val,
4709 if (unlikely(ret < 0))
4710 return X86EMUL_IO_NEEDED;
4712 return X86EMUL_CONTINUE;
4715 int kvm_read_guest_virt(struct kvm_vcpu *vcpu,
4716 gva_t addr, void *val, unsigned int bytes,
4717 struct x86_exception *exception)
4719 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4722 * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED
4723 * is returned, but our callers are not ready for that and they blindly
4724 * call kvm_inject_page_fault. Ensure that they at least do not leak
4725 * uninitialized kernel stack memory into cr2 and error code.
4727 memset(exception, 0, sizeof(*exception));
4728 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
4731 EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
4733 static int emulator_read_std(struct x86_emulate_ctxt *ctxt,
4734 gva_t addr, void *val, unsigned int bytes,
4735 struct x86_exception *exception, bool system)
4737 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4740 if (!system && kvm_x86_ops->get_cpl(vcpu) == 3)
4741 access |= PFERR_USER_MASK;
4743 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access, exception);
4746 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt *ctxt,
4747 unsigned long addr, void *val, unsigned int bytes)
4749 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4750 int r = kvm_vcpu_read_guest(vcpu, addr, val, bytes);
4752 return r < 0 ? X86EMUL_IO_NEEDED : X86EMUL_CONTINUE;
4755 static int kvm_write_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
4756 struct kvm_vcpu *vcpu, u32 access,
4757 struct x86_exception *exception)
4760 int r = X86EMUL_CONTINUE;
4763 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
4766 unsigned offset = addr & (PAGE_SIZE-1);
4767 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
4770 if (gpa == UNMAPPED_GVA)
4771 return X86EMUL_PROPAGATE_FAULT;
4772 ret = kvm_vcpu_write_guest(vcpu, gpa, data, towrite);
4774 r = X86EMUL_IO_NEEDED;
4786 static int emulator_write_std(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val,
4787 unsigned int bytes, struct x86_exception *exception,
4790 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4791 u32 access = PFERR_WRITE_MASK;
4793 if (!system && kvm_x86_ops->get_cpl(vcpu) == 3)
4794 access |= PFERR_USER_MASK;
4796 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
4800 int kvm_write_guest_virt_system(struct kvm_vcpu *vcpu, gva_t addr, void *val,
4801 unsigned int bytes, struct x86_exception *exception)
4803 /* kvm_write_guest_virt_system can pull in tons of pages. */
4804 vcpu->arch.l1tf_flush_l1d = true;
4807 * FIXME: this should call handle_emulation_failure if X86EMUL_IO_NEEDED
4808 * is returned, but our callers are not ready for that and they blindly
4809 * call kvm_inject_page_fault. Ensure that they at least do not leak
4810 * uninitialized kernel stack memory into cr2 and error code.
4812 memset(exception, 0, sizeof(*exception));
4813 return kvm_write_guest_virt_helper(addr, val, bytes, vcpu,
4814 PFERR_WRITE_MASK, exception);
4816 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
4818 static int vcpu_is_mmio_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
4819 gpa_t gpa, bool write)
4821 /* For APIC access vmexit */
4822 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
4825 if (vcpu_match_mmio_gpa(vcpu, gpa)) {
4826 trace_vcpu_match_mmio(gva, gpa, write, true);
4833 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
4834 gpa_t *gpa, struct x86_exception *exception,
4837 u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0)
4838 | (write ? PFERR_WRITE_MASK : 0);
4841 * currently PKRU is only applied to ept enabled guest so
4842 * there is no pkey in EPT page table for L1 guest or EPT
4843 * shadow page table for L2 guest.
4845 if (vcpu_match_mmio_gva(vcpu, gva)
4846 && !permission_fault(vcpu, vcpu->arch.walk_mmu,
4847 vcpu->arch.access, 0, access)) {
4848 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
4849 (gva & (PAGE_SIZE - 1));
4850 trace_vcpu_match_mmio(gva, *gpa, write, false);
4854 *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
4856 if (*gpa == UNMAPPED_GVA)
4859 return vcpu_is_mmio_gpa(vcpu, gva, *gpa, write);
4862 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
4863 const void *val, int bytes)
4867 ret = kvm_vcpu_write_guest(vcpu, gpa, val, bytes);
4870 kvm_page_track_write(vcpu, gpa, val, bytes);
4874 struct read_write_emulator_ops {
4875 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
4877 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
4878 void *val, int bytes);
4879 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
4880 int bytes, void *val);
4881 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
4882 void *val, int bytes);
4886 static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
4888 if (vcpu->mmio_read_completed) {
4889 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
4890 vcpu->mmio_fragments[0].gpa, val);
4891 vcpu->mmio_read_completed = 0;
4898 static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
4899 void *val, int bytes)
4901 return !kvm_vcpu_read_guest(vcpu, gpa, val, bytes);
4904 static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
4905 void *val, int bytes)
4907 return emulator_write_phys(vcpu, gpa, val, bytes);
4910 static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
4912 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, val);
4913 return vcpu_mmio_write(vcpu, gpa, bytes, val);
4916 static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
4917 void *val, int bytes)
4919 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, NULL);
4920 return X86EMUL_IO_NEEDED;
4923 static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
4924 void *val, int bytes)
4926 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
4928 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
4929 return X86EMUL_CONTINUE;
4932 static const struct read_write_emulator_ops read_emultor = {
4933 .read_write_prepare = read_prepare,
4934 .read_write_emulate = read_emulate,
4935 .read_write_mmio = vcpu_mmio_read,
4936 .read_write_exit_mmio = read_exit_mmio,
4939 static const struct read_write_emulator_ops write_emultor = {
4940 .read_write_emulate = write_emulate,
4941 .read_write_mmio = write_mmio,
4942 .read_write_exit_mmio = write_exit_mmio,
4946 static int emulator_read_write_onepage(unsigned long addr, void *val,
4948 struct x86_exception *exception,
4949 struct kvm_vcpu *vcpu,
4950 const struct read_write_emulator_ops *ops)
4954 bool write = ops->write;
4955 struct kvm_mmio_fragment *frag;
4956 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4959 * If the exit was due to a NPF we may already have a GPA.
4960 * If the GPA is present, use it to avoid the GVA to GPA table walk.
4961 * Note, this cannot be used on string operations since string
4962 * operation using rep will only have the initial GPA from the NPF
4965 if (vcpu->arch.gpa_available &&
4966 emulator_can_use_gpa(ctxt) &&
4967 (addr & ~PAGE_MASK) == (vcpu->arch.gpa_val & ~PAGE_MASK)) {
4968 gpa = vcpu->arch.gpa_val;
4969 ret = vcpu_is_mmio_gpa(vcpu, addr, gpa, write);
4971 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
4973 return X86EMUL_PROPAGATE_FAULT;
4976 if (!ret && ops->read_write_emulate(vcpu, gpa, val, bytes))
4977 return X86EMUL_CONTINUE;
4980 * Is this MMIO handled locally?
4982 handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
4983 if (handled == bytes)
4984 return X86EMUL_CONTINUE;
4990 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS);
4991 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
4995 return X86EMUL_CONTINUE;
4998 static int emulator_read_write(struct x86_emulate_ctxt *ctxt,
5000 void *val, unsigned int bytes,
5001 struct x86_exception *exception,
5002 const struct read_write_emulator_ops *ops)
5004 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5008 if (ops->read_write_prepare &&
5009 ops->read_write_prepare(vcpu, val, bytes))
5010 return X86EMUL_CONTINUE;
5012 vcpu->mmio_nr_fragments = 0;
5014 /* Crossing a page boundary? */
5015 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
5018 now = -addr & ~PAGE_MASK;
5019 rc = emulator_read_write_onepage(addr, val, now, exception,
5022 if (rc != X86EMUL_CONTINUE)
5025 if (ctxt->mode != X86EMUL_MODE_PROT64)
5031 rc = emulator_read_write_onepage(addr, val, bytes, exception,
5033 if (rc != X86EMUL_CONTINUE)
5036 if (!vcpu->mmio_nr_fragments)
5039 gpa = vcpu->mmio_fragments[0].gpa;
5041 vcpu->mmio_needed = 1;
5042 vcpu->mmio_cur_fragment = 0;
5044 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len);
5045 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
5046 vcpu->run->exit_reason = KVM_EXIT_MMIO;
5047 vcpu->run->mmio.phys_addr = gpa;
5049 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
5052 static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
5056 struct x86_exception *exception)
5058 return emulator_read_write(ctxt, addr, val, bytes,
5059 exception, &read_emultor);
5062 static int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
5066 struct x86_exception *exception)
5068 return emulator_read_write(ctxt, addr, (void *)val, bytes,
5069 exception, &write_emultor);
5072 #define CMPXCHG_TYPE(t, ptr, old, new) \
5073 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
5075 #ifdef CONFIG_X86_64
5076 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
5078 # define CMPXCHG64(ptr, old, new) \
5079 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
5082 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
5087 struct x86_exception *exception)
5089 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5095 /* guests cmpxchg8b have to be emulated atomically */
5096 if (bytes > 8 || (bytes & (bytes - 1)))
5099 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
5101 if (gpa == UNMAPPED_GVA ||
5102 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
5105 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
5108 page = kvm_vcpu_gfn_to_page(vcpu, gpa >> PAGE_SHIFT);
5109 if (is_error_page(page))
5112 kaddr = kmap_atomic(page);
5113 kaddr += offset_in_page(gpa);
5116 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
5119 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
5122 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
5125 exchanged = CMPXCHG64(kaddr, old, new);
5130 kunmap_atomic(kaddr);
5131 kvm_release_page_dirty(page);
5134 return X86EMUL_CMPXCHG_FAILED;
5136 kvm_vcpu_mark_page_dirty(vcpu, gpa >> PAGE_SHIFT);
5137 kvm_page_track_write(vcpu, gpa, new, bytes);
5139 return X86EMUL_CONTINUE;
5142 printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
5144 return emulator_write_emulated(ctxt, addr, new, bytes, exception);
5147 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
5151 for (i = 0; i < vcpu->arch.pio.count; i++) {
5152 if (vcpu->arch.pio.in)
5153 r = kvm_io_bus_read(vcpu, KVM_PIO_BUS, vcpu->arch.pio.port,
5154 vcpu->arch.pio.size, pd);
5156 r = kvm_io_bus_write(vcpu, KVM_PIO_BUS,
5157 vcpu->arch.pio.port, vcpu->arch.pio.size,
5161 pd += vcpu->arch.pio.size;
5166 static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
5167 unsigned short port, void *val,
5168 unsigned int count, bool in)
5170 vcpu->arch.pio.port = port;
5171 vcpu->arch.pio.in = in;
5172 vcpu->arch.pio.count = count;
5173 vcpu->arch.pio.size = size;
5175 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
5176 vcpu->arch.pio.count = 0;
5180 vcpu->run->exit_reason = KVM_EXIT_IO;
5181 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
5182 vcpu->run->io.size = size;
5183 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
5184 vcpu->run->io.count = count;
5185 vcpu->run->io.port = port;
5190 static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
5191 int size, unsigned short port, void *val,
5194 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5197 if (vcpu->arch.pio.count)
5200 memset(vcpu->arch.pio_data, 0, size * count);
5202 ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
5205 memcpy(val, vcpu->arch.pio_data, size * count);
5206 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data);
5207 vcpu->arch.pio.count = 0;
5214 static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
5215 int size, unsigned short port,
5216 const void *val, unsigned int count)
5218 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5220 memcpy(vcpu->arch.pio_data, val, size * count);
5221 trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data);
5222 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
5225 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
5227 return kvm_x86_ops->get_segment_base(vcpu, seg);
5230 static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
5232 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
5235 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu)
5237 if (!need_emulate_wbinvd(vcpu))
5238 return X86EMUL_CONTINUE;
5240 if (kvm_x86_ops->has_wbinvd_exit()) {
5241 int cpu = get_cpu();
5243 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
5244 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
5245 wbinvd_ipi, NULL, 1);
5247 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
5250 return X86EMUL_CONTINUE;
5253 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
5255 kvm_emulate_wbinvd_noskip(vcpu);
5256 return kvm_skip_emulated_instruction(vcpu);
5258 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
5262 static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
5264 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt));
5267 static int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr,
5268 unsigned long *dest)
5270 return kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
5273 static int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr,
5274 unsigned long value)
5277 return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
5280 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
5282 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
5285 static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
5287 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5288 unsigned long value;
5292 value = kvm_read_cr0(vcpu);
5295 value = vcpu->arch.cr2;
5298 value = kvm_read_cr3(vcpu);
5301 value = kvm_read_cr4(vcpu);
5304 value = kvm_get_cr8(vcpu);
5307 kvm_err("%s: unexpected cr %u\n", __func__, cr);
5314 static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
5316 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5321 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
5324 vcpu->arch.cr2 = val;
5327 res = kvm_set_cr3(vcpu, val);
5330 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
5333 res = kvm_set_cr8(vcpu, val);
5336 kvm_err("%s: unexpected cr %u\n", __func__, cr);
5343 static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
5345 return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
5348 static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
5350 kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
5353 static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
5355 kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
5358 static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
5360 kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
5363 static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
5365 kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
5368 static unsigned long emulator_get_cached_segment_base(
5369 struct x86_emulate_ctxt *ctxt, int seg)
5371 return get_segment_base(emul_to_vcpu(ctxt), seg);
5374 static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
5375 struct desc_struct *desc, u32 *base3,
5378 struct kvm_segment var;
5380 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
5381 *selector = var.selector;
5384 memset(desc, 0, sizeof(*desc));
5392 set_desc_limit(desc, var.limit);
5393 set_desc_base(desc, (unsigned long)var.base);
5394 #ifdef CONFIG_X86_64
5396 *base3 = var.base >> 32;
5398 desc->type = var.type;
5400 desc->dpl = var.dpl;
5401 desc->p = var.present;
5402 desc->avl = var.avl;
5410 static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
5411 struct desc_struct *desc, u32 base3,
5414 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5415 struct kvm_segment var;
5417 var.selector = selector;
5418 var.base = get_desc_base(desc);
5419 #ifdef CONFIG_X86_64
5420 var.base |= ((u64)base3) << 32;
5422 var.limit = get_desc_limit(desc);
5424 var.limit = (var.limit << 12) | 0xfff;
5425 var.type = desc->type;
5426 var.dpl = desc->dpl;
5431 var.avl = desc->avl;
5432 var.present = desc->p;
5433 var.unusable = !var.present;
5436 kvm_set_segment(vcpu, &var, seg);
5440 static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
5441 u32 msr_index, u64 *pdata)
5443 struct msr_data msr;
5446 msr.index = msr_index;
5447 msr.host_initiated = false;
5448 r = kvm_get_msr(emul_to_vcpu(ctxt), &msr);
5456 static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
5457 u32 msr_index, u64 data)
5459 struct msr_data msr;
5462 msr.index = msr_index;
5463 msr.host_initiated = false;
5464 return kvm_set_msr(emul_to_vcpu(ctxt), &msr);
5467 static u64 emulator_get_smbase(struct x86_emulate_ctxt *ctxt)
5469 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5471 return vcpu->arch.smbase;
5474 static void emulator_set_smbase(struct x86_emulate_ctxt *ctxt, u64 smbase)
5476 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5478 vcpu->arch.smbase = smbase;
5481 static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt,
5484 return kvm_pmu_is_valid_msr_idx(emul_to_vcpu(ctxt), pmc);
5487 static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
5488 u32 pmc, u64 *pdata)
5490 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt), pmc, pdata);
5493 static void emulator_halt(struct x86_emulate_ctxt *ctxt)
5495 emul_to_vcpu(ctxt)->arch.halt_request = 1;
5498 static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
5502 static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
5506 static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
5507 struct x86_instruction_info *info,
5508 enum x86_intercept_stage stage)
5510 return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
5513 static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
5514 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx, bool check_limit)
5516 return kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx, check_limit);
5519 static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
5521 return kvm_register_read(emul_to_vcpu(ctxt), reg);
5524 static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val)
5526 kvm_register_write(emul_to_vcpu(ctxt), reg, val);
5529 static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked)
5531 kvm_x86_ops->set_nmi_mask(emul_to_vcpu(ctxt), masked);
5534 static unsigned emulator_get_hflags(struct x86_emulate_ctxt *ctxt)
5536 return emul_to_vcpu(ctxt)->arch.hflags;
5539 static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_flags)
5541 kvm_set_hflags(emul_to_vcpu(ctxt), emul_flags);
5544 static const struct x86_emulate_ops emulate_ops = {
5545 .read_gpr = emulator_read_gpr,
5546 .write_gpr = emulator_write_gpr,
5547 .read_std = emulator_read_std,
5548 .write_std = emulator_write_std,
5549 .read_phys = kvm_read_guest_phys_system,
5550 .fetch = kvm_fetch_guest_virt,
5551 .read_emulated = emulator_read_emulated,
5552 .write_emulated = emulator_write_emulated,
5553 .cmpxchg_emulated = emulator_cmpxchg_emulated,
5554 .invlpg = emulator_invlpg,
5555 .pio_in_emulated = emulator_pio_in_emulated,
5556 .pio_out_emulated = emulator_pio_out_emulated,
5557 .get_segment = emulator_get_segment,
5558 .set_segment = emulator_set_segment,
5559 .get_cached_segment_base = emulator_get_cached_segment_base,
5560 .get_gdt = emulator_get_gdt,
5561 .get_idt = emulator_get_idt,
5562 .set_gdt = emulator_set_gdt,
5563 .set_idt = emulator_set_idt,
5564 .get_cr = emulator_get_cr,
5565 .set_cr = emulator_set_cr,
5566 .cpl = emulator_get_cpl,
5567 .get_dr = emulator_get_dr,
5568 .set_dr = emulator_set_dr,
5569 .get_smbase = emulator_get_smbase,
5570 .set_smbase = emulator_set_smbase,
5571 .set_msr = emulator_set_msr,
5572 .get_msr = emulator_get_msr,
5573 .check_pmc = emulator_check_pmc,
5574 .read_pmc = emulator_read_pmc,
5575 .halt = emulator_halt,
5576 .wbinvd = emulator_wbinvd,
5577 .fix_hypercall = emulator_fix_hypercall,
5578 .get_fpu = emulator_get_fpu,
5579 .put_fpu = emulator_put_fpu,
5580 .intercept = emulator_intercept,
5581 .get_cpuid = emulator_get_cpuid,
5582 .set_nmi_mask = emulator_set_nmi_mask,
5583 .get_hflags = emulator_get_hflags,
5584 .set_hflags = emulator_set_hflags,
5587 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
5589 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu);
5591 * an sti; sti; sequence only disable interrupts for the first
5592 * instruction. So, if the last instruction, be it emulated or
5593 * not, left the system with the INT_STI flag enabled, it
5594 * means that the last instruction is an sti. We should not
5595 * leave the flag on in this case. The same goes for mov ss
5597 if (int_shadow & mask)
5599 if (unlikely(int_shadow || mask)) {
5600 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
5602 kvm_make_request(KVM_REQ_EVENT, vcpu);
5606 static bool inject_emulated_exception(struct kvm_vcpu *vcpu)
5608 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5609 if (ctxt->exception.vector == PF_VECTOR)
5610 return kvm_propagate_fault(vcpu, &ctxt->exception);
5612 if (ctxt->exception.error_code_valid)
5613 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
5614 ctxt->exception.error_code);
5616 kvm_queue_exception(vcpu, ctxt->exception.vector);
5620 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
5622 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5625 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
5627 ctxt->eflags = kvm_get_rflags(vcpu);
5628 ctxt->tf = (ctxt->eflags & X86_EFLAGS_TF) != 0;
5630 ctxt->eip = kvm_rip_read(vcpu);
5631 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
5632 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 :
5633 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 :
5634 cs_db ? X86EMUL_MODE_PROT32 :
5635 X86EMUL_MODE_PROT16;
5636 BUILD_BUG_ON(HF_GUEST_MASK != X86EMUL_GUEST_MASK);
5637 BUILD_BUG_ON(HF_SMM_MASK != X86EMUL_SMM_MASK);
5638 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK != X86EMUL_SMM_INSIDE_NMI_MASK);
5640 init_decode_cache(ctxt);
5641 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
5644 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
5646 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5649 init_emulate_ctxt(vcpu);
5653 ctxt->_eip = ctxt->eip + inc_eip;
5654 ret = emulate_int_real(ctxt, irq);
5656 if (ret != X86EMUL_CONTINUE)
5657 return EMULATE_FAIL;
5659 ctxt->eip = ctxt->_eip;
5660 kvm_rip_write(vcpu, ctxt->eip);
5661 kvm_set_rflags(vcpu, ctxt->eflags);
5663 if (irq == NMI_VECTOR)
5664 vcpu->arch.nmi_pending = 0;
5666 vcpu->arch.interrupt.pending = false;
5668 return EMULATE_DONE;
5670 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
5672 static int handle_emulation_failure(struct kvm_vcpu *vcpu)
5674 int r = EMULATE_DONE;
5676 ++vcpu->stat.insn_emulation_fail;
5677 trace_kvm_emulate_insn_failed(vcpu);
5678 if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0) {
5679 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
5680 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
5681 vcpu->run->internal.ndata = 0;
5682 r = EMULATE_USER_EXIT;
5684 kvm_queue_exception(vcpu, UD_VECTOR);
5689 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2,
5690 bool write_fault_to_shadow_pgtable,
5696 if (emulation_type & EMULTYPE_NO_REEXECUTE)
5699 if (!vcpu->arch.mmu.direct_map) {
5701 * Write permission should be allowed since only
5702 * write access need to be emulated.
5704 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
5707 * If the mapping is invalid in guest, let cpu retry
5708 * it to generate fault.
5710 if (gpa == UNMAPPED_GVA)
5715 * Do not retry the unhandleable instruction if it faults on the
5716 * readonly host memory, otherwise it will goto a infinite loop:
5717 * retry instruction -> write #PF -> emulation fail -> retry
5718 * instruction -> ...
5720 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
5723 * If the instruction failed on the error pfn, it can not be fixed,
5724 * report the error to userspace.
5726 if (is_error_noslot_pfn(pfn))
5729 kvm_release_pfn_clean(pfn);
5731 /* The instructions are well-emulated on direct mmu. */
5732 if (vcpu->arch.mmu.direct_map) {
5733 unsigned int indirect_shadow_pages;
5735 spin_lock(&vcpu->kvm->mmu_lock);
5736 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages;
5737 spin_unlock(&vcpu->kvm->mmu_lock);
5739 if (indirect_shadow_pages)
5740 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
5746 * if emulation was due to access to shadowed page table
5747 * and it failed try to unshadow page and re-enter the
5748 * guest to let CPU execute the instruction.
5750 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
5753 * If the access faults on its page table, it can not
5754 * be fixed by unprotecting shadow page and it should
5755 * be reported to userspace.
5757 return !write_fault_to_shadow_pgtable;
5760 static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
5761 unsigned long cr2, int emulation_type)
5763 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5764 unsigned long last_retry_eip, last_retry_addr, gpa = cr2;
5766 last_retry_eip = vcpu->arch.last_retry_eip;
5767 last_retry_addr = vcpu->arch.last_retry_addr;
5770 * If the emulation is caused by #PF and it is non-page_table
5771 * writing instruction, it means the VM-EXIT is caused by shadow
5772 * page protected, we can zap the shadow page and retry this
5773 * instruction directly.
5775 * Note: if the guest uses a non-page-table modifying instruction
5776 * on the PDE that points to the instruction, then we will unmap
5777 * the instruction and go to an infinite loop. So, we cache the
5778 * last retried eip and the last fault address, if we meet the eip
5779 * and the address again, we can break out of the potential infinite
5782 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
5784 if (!(emulation_type & EMULTYPE_RETRY))
5787 if (x86_page_table_writing_insn(ctxt))
5790 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2)
5793 vcpu->arch.last_retry_eip = ctxt->eip;
5794 vcpu->arch.last_retry_addr = cr2;
5796 if (!vcpu->arch.mmu.direct_map)
5797 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
5799 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
5804 static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
5805 static int complete_emulated_pio(struct kvm_vcpu *vcpu);
5807 static void kvm_smm_changed(struct kvm_vcpu *vcpu)
5809 if (!(vcpu->arch.hflags & HF_SMM_MASK)) {
5810 /* This is a good place to trace that we are exiting SMM. */
5811 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, false);
5813 /* Process a latched INIT or SMI, if any. */
5814 kvm_make_request(KVM_REQ_EVENT, vcpu);
5817 kvm_mmu_reset_context(vcpu);
5820 static void kvm_set_hflags(struct kvm_vcpu *vcpu, unsigned emul_flags)
5822 unsigned changed = vcpu->arch.hflags ^ emul_flags;
5824 vcpu->arch.hflags = emul_flags;
5826 if (changed & HF_SMM_MASK)
5827 kvm_smm_changed(vcpu);
5830 static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
5839 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4)
5840 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr)
5845 static void kvm_vcpu_do_singlestep(struct kvm_vcpu *vcpu, int *r)
5847 struct kvm_run *kvm_run = vcpu->run;
5849 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
5850 kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 | DR6_RTM;
5851 kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip;
5852 kvm_run->debug.arch.exception = DB_VECTOR;
5853 kvm_run->exit_reason = KVM_EXIT_DEBUG;
5854 *r = EMULATE_USER_EXIT;
5857 * "Certain debug exceptions may clear bit 0-3. The
5858 * remaining contents of the DR6 register are never
5859 * cleared by the processor".
5861 vcpu->arch.dr6 &= ~15;
5862 vcpu->arch.dr6 |= DR6_BS | DR6_RTM;
5863 kvm_queue_exception(vcpu, DB_VECTOR);
5867 int kvm_skip_emulated_instruction(struct kvm_vcpu *vcpu)
5869 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);
5870 int r = EMULATE_DONE;
5872 kvm_x86_ops->skip_emulated_instruction(vcpu);
5875 * rflags is the old, "raw" value of the flags. The new value has
5876 * not been saved yet.
5878 * This is correct even for TF set by the guest, because "the
5879 * processor will not generate this exception after the instruction
5880 * that sets the TF flag".
5882 if (unlikely(rflags & X86_EFLAGS_TF))
5883 kvm_vcpu_do_singlestep(vcpu, &r);
5884 return r == EMULATE_DONE;
5886 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction);
5888 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r)
5890 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) &&
5891 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) {
5892 struct kvm_run *kvm_run = vcpu->run;
5893 unsigned long eip = kvm_get_linear_rip(vcpu);
5894 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
5895 vcpu->arch.guest_debug_dr7,
5899 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM;
5900 kvm_run->debug.arch.pc = eip;
5901 kvm_run->debug.arch.exception = DB_VECTOR;
5902 kvm_run->exit_reason = KVM_EXIT_DEBUG;
5903 *r = EMULATE_USER_EXIT;
5908 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) &&
5909 !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) {
5910 unsigned long eip = kvm_get_linear_rip(vcpu);
5911 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
5916 vcpu->arch.dr6 &= ~15;
5917 vcpu->arch.dr6 |= dr6 | DR6_RTM;
5918 kvm_queue_exception(vcpu, DB_VECTOR);
5927 int x86_emulate_instruction(struct kvm_vcpu *vcpu,
5934 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
5935 bool writeback = true;
5936 bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
5938 vcpu->arch.l1tf_flush_l1d = true;
5941 * Clear write_fault_to_shadow_pgtable here to ensure it is
5944 vcpu->arch.write_fault_to_shadow_pgtable = false;
5945 kvm_clear_exception_queue(vcpu);
5947 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
5948 init_emulate_ctxt(vcpu);
5951 * We will reenter on the same instruction since
5952 * we do not set complete_userspace_io. This does not
5953 * handle watchpoints yet, those would be handled in
5956 if (!(emulation_type & EMULTYPE_SKIP) &&
5957 kvm_vcpu_check_breakpoint(vcpu, &r))
5960 ctxt->interruptibility = 0;
5961 ctxt->have_exception = false;
5962 ctxt->exception.vector = -1;
5963 ctxt->perm_ok = false;
5965 ctxt->ud = emulation_type & EMULTYPE_TRAP_UD;
5967 r = x86_decode_insn(ctxt, insn, insn_len);
5969 trace_kvm_emulate_insn_start(vcpu);
5970 ++vcpu->stat.insn_emulation;
5971 if (r != EMULATION_OK) {
5972 if (emulation_type & EMULTYPE_TRAP_UD)
5973 return EMULATE_FAIL;
5974 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
5976 return EMULATE_DONE;
5977 if (ctxt->have_exception) {
5979 * #UD should result in just EMULATION_FAILED, and trap-like
5980 * exception should not be encountered during decode.
5982 WARN_ON_ONCE(ctxt->exception.vector == UD_VECTOR ||
5983 exception_type(ctxt->exception.vector) == EXCPT_TRAP);
5984 inject_emulated_exception(vcpu);
5985 return EMULATE_DONE;
5987 if (emulation_type & EMULTYPE_SKIP)
5988 return EMULATE_FAIL;
5989 return handle_emulation_failure(vcpu);
5993 if (emulation_type & EMULTYPE_SKIP) {
5994 kvm_rip_write(vcpu, ctxt->_eip);
5995 if (ctxt->eflags & X86_EFLAGS_RF)
5996 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF);
5997 return EMULATE_DONE;
6000 if (retry_instruction(ctxt, cr2, emulation_type))
6001 return EMULATE_DONE;
6003 /* this is needed for vmware backdoor interface to work since it
6004 changes registers values during IO operation */
6005 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
6006 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
6007 emulator_invalidate_register_cache(ctxt);
6011 /* Save the faulting GPA (cr2) in the address field */
6012 ctxt->exception.address = cr2;
6014 r = x86_emulate_insn(ctxt);
6016 if (r == EMULATION_INTERCEPTED)
6017 return EMULATE_DONE;
6019 if (r == EMULATION_FAILED) {
6020 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
6022 return EMULATE_DONE;
6024 return handle_emulation_failure(vcpu);
6027 if (ctxt->have_exception) {
6029 if (inject_emulated_exception(vcpu))
6031 } else if (vcpu->arch.pio.count) {
6032 if (!vcpu->arch.pio.in) {
6033 /* FIXME: return into emulator if single-stepping. */
6034 vcpu->arch.pio.count = 0;
6037 vcpu->arch.complete_userspace_io = complete_emulated_pio;
6039 r = EMULATE_USER_EXIT;
6040 } else if (vcpu->mmio_needed) {
6041 if (!vcpu->mmio_is_write)
6043 r = EMULATE_USER_EXIT;
6044 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
6045 } else if (r == EMULATION_RESTART)
6051 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);
6052 toggle_interruptibility(vcpu, ctxt->interruptibility);
6053 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
6054 if (!ctxt->have_exception ||
6055 exception_type(ctxt->exception.vector) == EXCPT_TRAP) {
6056 kvm_rip_write(vcpu, ctxt->eip);
6057 if (r == EMULATE_DONE && ctxt->tf)
6058 kvm_vcpu_do_singlestep(vcpu, &r);
6059 __kvm_set_rflags(vcpu, ctxt->eflags);
6063 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
6064 * do nothing, and it will be requested again as soon as
6065 * the shadow expires. But we still need to check here,
6066 * because POPF has no interrupt shadow.
6068 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF))
6069 kvm_make_request(KVM_REQ_EVENT, vcpu);
6071 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
6075 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
6077 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
6079 unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
6080 int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
6081 size, port, &val, 1);
6082 /* do not return to emulator after return from userspace */
6083 vcpu->arch.pio.count = 0;
6086 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
6088 static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
6092 /* We should only ever be called with arch.pio.count equal to 1 */
6093 BUG_ON(vcpu->arch.pio.count != 1);
6095 /* For size less than 4 we merge, else we zero extend */
6096 val = (vcpu->arch.pio.size < 4) ? kvm_register_read(vcpu, VCPU_REGS_RAX)
6100 * Since vcpu->arch.pio.count == 1 let emulator_pio_in_emulated perform
6101 * the copy and tracing
6103 emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, vcpu->arch.pio.size,
6104 vcpu->arch.pio.port, &val, 1);
6105 kvm_register_write(vcpu, VCPU_REGS_RAX, val);
6110 int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size, unsigned short port)
6115 /* For size less than 4 we merge, else we zero extend */
6116 val = (size < 4) ? kvm_register_read(vcpu, VCPU_REGS_RAX) : 0;
6118 ret = emulator_pio_in_emulated(&vcpu->arch.emulate_ctxt, size, port,
6121 kvm_register_write(vcpu, VCPU_REGS_RAX, val);
6125 vcpu->arch.complete_userspace_io = complete_fast_pio_in;
6129 EXPORT_SYMBOL_GPL(kvm_fast_pio_in);
6131 static int kvmclock_cpu_down_prep(unsigned int cpu)
6133 __this_cpu_write(cpu_tsc_khz, 0);
6137 static void tsc_khz_changed(void *data)
6139 struct cpufreq_freqs *freq = data;
6140 unsigned long khz = 0;
6144 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
6145 khz = cpufreq_quick_get(raw_smp_processor_id());
6148 __this_cpu_write(cpu_tsc_khz, khz);
6151 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
6154 struct cpufreq_freqs *freq = data;
6156 struct kvm_vcpu *vcpu;
6157 int i, send_ipi = 0;
6160 * We allow guests to temporarily run on slowing clocks,
6161 * provided we notify them after, or to run on accelerating
6162 * clocks, provided we notify them before. Thus time never
6165 * However, we have a problem. We can't atomically update
6166 * the frequency of a given CPU from this function; it is
6167 * merely a notifier, which can be called from any CPU.
6168 * Changing the TSC frequency at arbitrary points in time
6169 * requires a recomputation of local variables related to
6170 * the TSC for each VCPU. We must flag these local variables
6171 * to be updated and be sure the update takes place with the
6172 * new frequency before any guests proceed.
6174 * Unfortunately, the combination of hotplug CPU and frequency
6175 * change creates an intractable locking scenario; the order
6176 * of when these callouts happen is undefined with respect to
6177 * CPU hotplug, and they can race with each other. As such,
6178 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
6179 * undefined; you can actually have a CPU frequency change take
6180 * place in between the computation of X and the setting of the
6181 * variable. To protect against this problem, all updates of
6182 * the per_cpu tsc_khz variable are done in an interrupt
6183 * protected IPI, and all callers wishing to update the value
6184 * must wait for a synchronous IPI to complete (which is trivial
6185 * if the caller is on the CPU already). This establishes the
6186 * necessary total order on variable updates.
6188 * Note that because a guest time update may take place
6189 * anytime after the setting of the VCPU's request bit, the
6190 * correct TSC value must be set before the request. However,
6191 * to ensure the update actually makes it to any guest which
6192 * starts running in hardware virtualization between the set
6193 * and the acquisition of the spinlock, we must also ping the
6194 * CPU after setting the request bit.
6198 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
6200 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
6203 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
6205 mutex_lock(&kvm_lock);
6206 list_for_each_entry(kvm, &vm_list, vm_list) {
6207 kvm_for_each_vcpu(i, vcpu, kvm) {
6208 if (vcpu->cpu != freq->cpu)
6210 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
6211 if (vcpu->cpu != raw_smp_processor_id())
6215 mutex_unlock(&kvm_lock);
6217 if (freq->old < freq->new && send_ipi) {
6219 * We upscale the frequency. Must make the guest
6220 * doesn't see old kvmclock values while running with
6221 * the new frequency, otherwise we risk the guest sees
6222 * time go backwards.
6224 * In case we update the frequency for another cpu
6225 * (which might be in guest context) send an interrupt
6226 * to kick the cpu out of guest context. Next time
6227 * guest context is entered kvmclock will be updated,
6228 * so the guest will not see stale values.
6230 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
6235 static struct notifier_block kvmclock_cpufreq_notifier_block = {
6236 .notifier_call = kvmclock_cpufreq_notifier
6239 static int kvmclock_cpu_online(unsigned int cpu)
6241 tsc_khz_changed(NULL);
6245 static void kvm_timer_init(void)
6247 max_tsc_khz = tsc_khz;
6249 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
6250 #ifdef CONFIG_CPU_FREQ
6251 struct cpufreq_policy policy;
6254 memset(&policy, 0, sizeof(policy));
6256 cpufreq_get_policy(&policy, cpu);
6257 if (policy.cpuinfo.max_freq)
6258 max_tsc_khz = policy.cpuinfo.max_freq;
6261 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
6262 CPUFREQ_TRANSITION_NOTIFIER);
6264 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
6266 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE, "x86/kvm/clk:online",
6267 kvmclock_cpu_online, kvmclock_cpu_down_prep);
6270 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
6272 int kvm_is_in_guest(void)
6274 return __this_cpu_read(current_vcpu) != NULL;
6277 static int kvm_is_user_mode(void)
6281 if (__this_cpu_read(current_vcpu))
6282 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu));
6284 return user_mode != 0;
6287 static unsigned long kvm_get_guest_ip(void)
6289 unsigned long ip = 0;
6291 if (__this_cpu_read(current_vcpu))
6292 ip = kvm_rip_read(__this_cpu_read(current_vcpu));
6297 static struct perf_guest_info_callbacks kvm_guest_cbs = {
6298 .is_in_guest = kvm_is_in_guest,
6299 .is_user_mode = kvm_is_user_mode,
6300 .get_guest_ip = kvm_get_guest_ip,
6303 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
6305 __this_cpu_write(current_vcpu, vcpu);
6307 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
6309 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
6311 __this_cpu_write(current_vcpu, NULL);
6313 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
6315 #ifdef CONFIG_X86_64
6316 static void pvclock_gtod_update_fn(struct work_struct *work)
6320 struct kvm_vcpu *vcpu;
6323 mutex_lock(&kvm_lock);
6324 list_for_each_entry(kvm, &vm_list, vm_list)
6325 kvm_for_each_vcpu(i, vcpu, kvm)
6326 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
6327 atomic_set(&kvm_guest_has_master_clock, 0);
6328 mutex_unlock(&kvm_lock);
6331 static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn);
6334 * Notification about pvclock gtod data update.
6336 static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused,
6339 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
6340 struct timekeeper *tk = priv;
6342 update_pvclock_gtod(tk);
6344 /* disable master clock if host does not trust, or does not
6345 * use, TSC clocksource
6347 if (gtod->clock.vclock_mode != VCLOCK_TSC &&
6348 atomic_read(&kvm_guest_has_master_clock) != 0)
6349 queue_work(system_long_wq, &pvclock_gtod_work);
6354 static struct notifier_block pvclock_gtod_notifier = {
6355 .notifier_call = pvclock_gtod_notify,
6359 int kvm_arch_init(void *opaque)
6362 struct kvm_x86_ops *ops = opaque;
6365 printk(KERN_ERR "kvm: already loaded the other module\n");
6370 if (!ops->cpu_has_kvm_support()) {
6371 printk(KERN_ERR "kvm: no hardware support\n");
6375 if (ops->disabled_by_bios()) {
6376 printk(KERN_ERR "kvm: disabled by bios\n");
6382 shared_msrs = alloc_percpu(struct kvm_shared_msrs);
6384 printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n");
6388 r = kvm_mmu_module_init();
6390 goto out_free_percpu;
6394 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
6395 PT_DIRTY_MASK, PT64_NX_MASK, 0,
6396 PT_PRESENT_MASK, 0, sme_me_mask);
6399 perf_register_guest_info_callbacks(&kvm_guest_cbs);
6401 if (boot_cpu_has(X86_FEATURE_XSAVE))
6402 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
6405 #ifdef CONFIG_X86_64
6406 pvclock_gtod_register_notifier(&pvclock_gtod_notifier);
6412 free_percpu(shared_msrs);
6417 void kvm_arch_exit(void)
6420 perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
6422 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
6423 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
6424 CPUFREQ_TRANSITION_NOTIFIER);
6425 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE);
6426 #ifdef CONFIG_X86_64
6427 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier);
6428 cancel_work_sync(&pvclock_gtod_work);
6431 kvm_mmu_module_exit();
6432 free_percpu(shared_msrs);
6435 int kvm_vcpu_halt(struct kvm_vcpu *vcpu)
6437 ++vcpu->stat.halt_exits;
6438 if (lapic_in_kernel(vcpu)) {
6439 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
6442 vcpu->run->exit_reason = KVM_EXIT_HLT;
6446 EXPORT_SYMBOL_GPL(kvm_vcpu_halt);
6448 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
6450 int ret = kvm_skip_emulated_instruction(vcpu);
6452 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered
6453 * KVM_EXIT_DEBUG here.
6455 return kvm_vcpu_halt(vcpu) && ret;
6457 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
6459 #ifdef CONFIG_X86_64
6460 static int kvm_pv_clock_pairing(struct kvm_vcpu *vcpu, gpa_t paddr,
6461 unsigned long clock_type)
6463 struct kvm_clock_pairing clock_pairing;
6468 if (clock_type != KVM_CLOCK_PAIRING_WALLCLOCK)
6469 return -KVM_EOPNOTSUPP;
6471 if (kvm_get_walltime_and_clockread(&ts, &cycle) == false)
6472 return -KVM_EOPNOTSUPP;
6474 clock_pairing.sec = ts.tv_sec;
6475 clock_pairing.nsec = ts.tv_nsec;
6476 clock_pairing.tsc = kvm_read_l1_tsc(vcpu, cycle);
6477 clock_pairing.flags = 0;
6478 memset(&clock_pairing.pad, 0, sizeof(clock_pairing.pad));
6481 if (kvm_write_guest(vcpu->kvm, paddr, &clock_pairing,
6482 sizeof(struct kvm_clock_pairing)))
6490 * kvm_pv_kick_cpu_op: Kick a vcpu.
6492 * @apicid - apicid of vcpu to be kicked.
6494 static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
6496 struct kvm_lapic_irq lapic_irq;
6498 lapic_irq.shorthand = 0;
6499 lapic_irq.dest_mode = 0;
6500 lapic_irq.level = 0;
6501 lapic_irq.dest_id = apicid;
6502 lapic_irq.msi_redir_hint = false;
6504 lapic_irq.delivery_mode = APIC_DM_REMRD;
6505 kvm_irq_delivery_to_apic(kvm, NULL, &lapic_irq, NULL);
6508 void kvm_vcpu_deactivate_apicv(struct kvm_vcpu *vcpu)
6510 vcpu->arch.apicv_active = false;
6511 kvm_x86_ops->refresh_apicv_exec_ctrl(vcpu);
6514 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
6516 unsigned long nr, a0, a1, a2, a3, ret;
6519 if (kvm_hv_hypercall_enabled(vcpu->kvm)) {
6520 if (!kvm_hv_hypercall(vcpu))
6525 nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
6526 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
6527 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
6528 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
6529 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
6531 trace_kvm_hypercall(nr, a0, a1, a2, a3);
6533 op_64_bit = is_64_bit_mode(vcpu);
6542 if (kvm_x86_ops->get_cpl(vcpu) != 0) {
6548 case KVM_HC_VAPIC_POLL_IRQ:
6551 case KVM_HC_KICK_CPU:
6552 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1);
6555 #ifdef CONFIG_X86_64
6556 case KVM_HC_CLOCK_PAIRING:
6557 ret = kvm_pv_clock_pairing(vcpu, a0, a1);
6567 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
6570 ++vcpu->stat.hypercalls;
6571 return kvm_skip_emulated_instruction(vcpu);
6573 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
6575 static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
6577 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6578 char instruction[3];
6579 unsigned long rip = kvm_rip_read(vcpu);
6581 kvm_x86_ops->patch_hypercall(vcpu, instruction);
6583 return emulator_write_emulated(ctxt, rip, instruction, 3,
6587 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
6589 return vcpu->run->request_interrupt_window &&
6590 likely(!pic_in_kernel(vcpu->kvm));
6593 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
6595 struct kvm_run *kvm_run = vcpu->run;
6597 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
6598 kvm_run->flags = is_smm(vcpu) ? KVM_RUN_X86_SMM : 0;
6599 kvm_run->cr8 = kvm_get_cr8(vcpu);
6600 kvm_run->apic_base = kvm_get_apic_base(vcpu);
6601 kvm_run->ready_for_interrupt_injection =
6602 pic_in_kernel(vcpu->kvm) ||
6603 kvm_vcpu_ready_for_interrupt_injection(vcpu);
6606 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
6610 if (!kvm_x86_ops->update_cr8_intercept)
6613 if (!lapic_in_kernel(vcpu))
6616 if (vcpu->arch.apicv_active)
6619 if (!vcpu->arch.apic->vapic_addr)
6620 max_irr = kvm_lapic_find_highest_irr(vcpu);
6627 tpr = kvm_lapic_get_cr8(vcpu);
6629 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
6632 static void kvm_inject_exception(struct kvm_vcpu *vcpu)
6634 if (vcpu->arch.exception.error_code && !is_protmode(vcpu))
6635 vcpu->arch.exception.error_code = false;
6636 kvm_x86_ops->queue_exception(vcpu);
6639 static int inject_pending_event(struct kvm_vcpu *vcpu)
6643 /* try to reinject previous events if any */
6644 if (vcpu->arch.exception.injected) {
6645 kvm_inject_exception(vcpu);
6650 * Exceptions must be injected immediately, or the exception
6651 * frame will have the address of the NMI or interrupt handler.
6653 if (!vcpu->arch.exception.pending) {
6654 if (vcpu->arch.nmi_injected) {
6655 kvm_x86_ops->set_nmi(vcpu);
6659 if (vcpu->arch.interrupt.pending) {
6660 kvm_x86_ops->set_irq(vcpu);
6665 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) {
6666 r = kvm_x86_ops->check_nested_events(vcpu);
6671 /* try to inject new event if pending */
6672 if (vcpu->arch.exception.pending) {
6673 trace_kvm_inj_exception(vcpu->arch.exception.nr,
6674 vcpu->arch.exception.has_error_code,
6675 vcpu->arch.exception.error_code);
6677 vcpu->arch.exception.pending = false;
6678 vcpu->arch.exception.injected = true;
6680 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
6681 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
6684 if (vcpu->arch.exception.nr == DB_VECTOR &&
6685 (vcpu->arch.dr7 & DR7_GD)) {
6686 vcpu->arch.dr7 &= ~DR7_GD;
6687 kvm_update_dr7(vcpu);
6690 kvm_inject_exception(vcpu);
6691 } else if (vcpu->arch.smi_pending && !is_smm(vcpu)) {
6692 vcpu->arch.smi_pending = false;
6694 } else if (vcpu->arch.nmi_pending && kvm_x86_ops->nmi_allowed(vcpu)) {
6695 --vcpu->arch.nmi_pending;
6696 vcpu->arch.nmi_injected = true;
6697 kvm_x86_ops->set_nmi(vcpu);
6698 } else if (kvm_cpu_has_injectable_intr(vcpu)) {
6700 * Because interrupts can be injected asynchronously, we are
6701 * calling check_nested_events again here to avoid a race condition.
6702 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this
6703 * proposal and current concerns. Perhaps we should be setting
6704 * KVM_REQ_EVENT only on certain events and not unconditionally?
6706 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) {
6707 r = kvm_x86_ops->check_nested_events(vcpu);
6711 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
6712 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
6714 kvm_x86_ops->set_irq(vcpu);
6721 static void process_nmi(struct kvm_vcpu *vcpu)
6726 * x86 is limited to one NMI running, and one NMI pending after it.
6727 * If an NMI is already in progress, limit further NMIs to just one.
6728 * Otherwise, allow two (and we'll inject the first one immediately).
6730 if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected)
6733 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
6734 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
6735 kvm_make_request(KVM_REQ_EVENT, vcpu);
6738 #define put_smstate(type, buf, offset, val) \
6739 *(type *)((buf) + (offset) - 0x7e00) = val
6741 static u32 enter_smm_get_segment_flags(struct kvm_segment *seg)
6744 flags |= seg->g << 23;
6745 flags |= seg->db << 22;
6746 flags |= seg->l << 21;
6747 flags |= seg->avl << 20;
6748 flags |= seg->present << 15;
6749 flags |= seg->dpl << 13;
6750 flags |= seg->s << 12;
6751 flags |= seg->type << 8;
6755 static void enter_smm_save_seg_32(struct kvm_vcpu *vcpu, char *buf, int n)
6757 struct kvm_segment seg;
6760 kvm_get_segment(vcpu, &seg, n);
6761 put_smstate(u32, buf, 0x7fa8 + n * 4, seg.selector);
6764 offset = 0x7f84 + n * 12;
6766 offset = 0x7f2c + (n - 3) * 12;
6768 put_smstate(u32, buf, offset + 8, seg.base);
6769 put_smstate(u32, buf, offset + 4, seg.limit);
6770 put_smstate(u32, buf, offset, enter_smm_get_segment_flags(&seg));
6773 #ifdef CONFIG_X86_64
6774 static void enter_smm_save_seg_64(struct kvm_vcpu *vcpu, char *buf, int n)
6776 struct kvm_segment seg;
6780 kvm_get_segment(vcpu, &seg, n);
6781 offset = 0x7e00 + n * 16;
6783 flags = enter_smm_get_segment_flags(&seg) >> 8;
6784 put_smstate(u16, buf, offset, seg.selector);
6785 put_smstate(u16, buf, offset + 2, flags);
6786 put_smstate(u32, buf, offset + 4, seg.limit);
6787 put_smstate(u64, buf, offset + 8, seg.base);
6791 static void enter_smm_save_state_32(struct kvm_vcpu *vcpu, char *buf)
6794 struct kvm_segment seg;
6798 put_smstate(u32, buf, 0x7ffc, kvm_read_cr0(vcpu));
6799 put_smstate(u32, buf, 0x7ff8, kvm_read_cr3(vcpu));
6800 put_smstate(u32, buf, 0x7ff4, kvm_get_rflags(vcpu));
6801 put_smstate(u32, buf, 0x7ff0, kvm_rip_read(vcpu));
6803 for (i = 0; i < 8; i++)
6804 put_smstate(u32, buf, 0x7fd0 + i * 4, kvm_register_read(vcpu, i));
6806 kvm_get_dr(vcpu, 6, &val);
6807 put_smstate(u32, buf, 0x7fcc, (u32)val);
6808 kvm_get_dr(vcpu, 7, &val);
6809 put_smstate(u32, buf, 0x7fc8, (u32)val);
6811 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
6812 put_smstate(u32, buf, 0x7fc4, seg.selector);
6813 put_smstate(u32, buf, 0x7f64, seg.base);
6814 put_smstate(u32, buf, 0x7f60, seg.limit);
6815 put_smstate(u32, buf, 0x7f5c, enter_smm_get_segment_flags(&seg));
6817 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
6818 put_smstate(u32, buf, 0x7fc0, seg.selector);
6819 put_smstate(u32, buf, 0x7f80, seg.base);
6820 put_smstate(u32, buf, 0x7f7c, seg.limit);
6821 put_smstate(u32, buf, 0x7f78, enter_smm_get_segment_flags(&seg));
6823 kvm_x86_ops->get_gdt(vcpu, &dt);
6824 put_smstate(u32, buf, 0x7f74, dt.address);
6825 put_smstate(u32, buf, 0x7f70, dt.size);
6827 kvm_x86_ops->get_idt(vcpu, &dt);
6828 put_smstate(u32, buf, 0x7f58, dt.address);
6829 put_smstate(u32, buf, 0x7f54, dt.size);
6831 for (i = 0; i < 6; i++)
6832 enter_smm_save_seg_32(vcpu, buf, i);
6834 put_smstate(u32, buf, 0x7f14, kvm_read_cr4(vcpu));
6837 put_smstate(u32, buf, 0x7efc, 0x00020000);
6838 put_smstate(u32, buf, 0x7ef8, vcpu->arch.smbase);
6841 static void enter_smm_save_state_64(struct kvm_vcpu *vcpu, char *buf)
6843 #ifdef CONFIG_X86_64
6845 struct kvm_segment seg;
6849 for (i = 0; i < 16; i++)
6850 put_smstate(u64, buf, 0x7ff8 - i * 8, kvm_register_read(vcpu, i));
6852 put_smstate(u64, buf, 0x7f78, kvm_rip_read(vcpu));
6853 put_smstate(u32, buf, 0x7f70, kvm_get_rflags(vcpu));
6855 kvm_get_dr(vcpu, 6, &val);
6856 put_smstate(u64, buf, 0x7f68, val);
6857 kvm_get_dr(vcpu, 7, &val);
6858 put_smstate(u64, buf, 0x7f60, val);
6860 put_smstate(u64, buf, 0x7f58, kvm_read_cr0(vcpu));
6861 put_smstate(u64, buf, 0x7f50, kvm_read_cr3(vcpu));
6862 put_smstate(u64, buf, 0x7f48, kvm_read_cr4(vcpu));
6864 put_smstate(u32, buf, 0x7f00, vcpu->arch.smbase);
6867 put_smstate(u32, buf, 0x7efc, 0x00020064);
6869 put_smstate(u64, buf, 0x7ed0, vcpu->arch.efer);
6871 kvm_get_segment(vcpu, &seg, VCPU_SREG_TR);
6872 put_smstate(u16, buf, 0x7e90, seg.selector);
6873 put_smstate(u16, buf, 0x7e92, enter_smm_get_segment_flags(&seg) >> 8);
6874 put_smstate(u32, buf, 0x7e94, seg.limit);
6875 put_smstate(u64, buf, 0x7e98, seg.base);
6877 kvm_x86_ops->get_idt(vcpu, &dt);
6878 put_smstate(u32, buf, 0x7e84, dt.size);
6879 put_smstate(u64, buf, 0x7e88, dt.address);
6881 kvm_get_segment(vcpu, &seg, VCPU_SREG_LDTR);
6882 put_smstate(u16, buf, 0x7e70, seg.selector);
6883 put_smstate(u16, buf, 0x7e72, enter_smm_get_segment_flags(&seg) >> 8);
6884 put_smstate(u32, buf, 0x7e74, seg.limit);
6885 put_smstate(u64, buf, 0x7e78, seg.base);
6887 kvm_x86_ops->get_gdt(vcpu, &dt);
6888 put_smstate(u32, buf, 0x7e64, dt.size);
6889 put_smstate(u64, buf, 0x7e68, dt.address);
6891 for (i = 0; i < 6; i++)
6892 enter_smm_save_seg_64(vcpu, buf, i);
6898 static void enter_smm(struct kvm_vcpu *vcpu)
6900 struct kvm_segment cs, ds;
6905 trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, true);
6906 vcpu->arch.hflags |= HF_SMM_MASK;
6907 memset(buf, 0, 512);
6908 if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
6909 enter_smm_save_state_64(vcpu, buf);
6911 enter_smm_save_state_32(vcpu, buf);
6913 kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
6915 if (kvm_x86_ops->get_nmi_mask(vcpu))
6916 vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
6918 kvm_x86_ops->set_nmi_mask(vcpu, true);
6920 kvm_set_rflags(vcpu, X86_EFLAGS_FIXED);
6921 kvm_rip_write(vcpu, 0x8000);
6923 cr0 = vcpu->arch.cr0 & ~(X86_CR0_PE | X86_CR0_EM | X86_CR0_TS | X86_CR0_PG);
6924 kvm_x86_ops->set_cr0(vcpu, cr0);
6925 vcpu->arch.cr0 = cr0;
6927 kvm_x86_ops->set_cr4(vcpu, 0);
6929 /* Undocumented: IDT limit is set to zero on entry to SMM. */
6930 dt.address = dt.size = 0;
6931 kvm_x86_ops->set_idt(vcpu, &dt);
6933 __kvm_set_dr(vcpu, 7, DR7_FIXED_1);
6935 cs.selector = (vcpu->arch.smbase >> 4) & 0xffff;
6936 cs.base = vcpu->arch.smbase;
6941 cs.limit = ds.limit = 0xffffffff;
6942 cs.type = ds.type = 0x3;
6943 cs.dpl = ds.dpl = 0;
6948 cs.avl = ds.avl = 0;
6949 cs.present = ds.present = 1;
6950 cs.unusable = ds.unusable = 0;
6951 cs.padding = ds.padding = 0;
6953 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
6954 kvm_set_segment(vcpu, &ds, VCPU_SREG_DS);
6955 kvm_set_segment(vcpu, &ds, VCPU_SREG_ES);
6956 kvm_set_segment(vcpu, &ds, VCPU_SREG_FS);
6957 kvm_set_segment(vcpu, &ds, VCPU_SREG_GS);
6958 kvm_set_segment(vcpu, &ds, VCPU_SREG_SS);
6960 if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
6961 kvm_x86_ops->set_efer(vcpu, 0);
6963 kvm_update_cpuid(vcpu);
6964 kvm_mmu_reset_context(vcpu);
6967 static void process_smi(struct kvm_vcpu *vcpu)
6969 vcpu->arch.smi_pending = true;
6970 kvm_make_request(KVM_REQ_EVENT, vcpu);
6973 void kvm_make_scan_ioapic_request(struct kvm *kvm)
6975 kvm_make_all_cpus_request(kvm, KVM_REQ_SCAN_IOAPIC);
6978 static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
6980 u64 eoi_exit_bitmap[4];
6982 if (!kvm_apic_hw_enabled(vcpu->arch.apic))
6985 bitmap_zero(vcpu->arch.ioapic_handled_vectors, 256);
6987 if (irqchip_split(vcpu->kvm))
6988 kvm_scan_ioapic_routes(vcpu, vcpu->arch.ioapic_handled_vectors);
6990 if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
6991 kvm_x86_ops->sync_pir_to_irr(vcpu);
6992 if (ioapic_in_kernel(vcpu->kvm))
6993 kvm_ioapic_scan_entry(vcpu, vcpu->arch.ioapic_handled_vectors);
6995 bitmap_or((ulong *)eoi_exit_bitmap, vcpu->arch.ioapic_handled_vectors,
6996 vcpu_to_synic(vcpu)->vec_bitmap, 256);
6997 kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
7000 static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu, bool invalidate_gpa)
7002 ++vcpu->stat.tlb_flush;
7003 kvm_x86_ops->tlb_flush(vcpu, invalidate_gpa);
7006 void kvm_arch_mmu_notifier_invalidate_range(struct kvm *kvm,
7007 unsigned long start, unsigned long end)
7009 unsigned long apic_address;
7012 * The physical address of apic access page is stored in the VMCS.
7013 * Update it when it becomes invalid.
7015 apic_address = gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
7016 if (start <= apic_address && apic_address < end)
7017 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
7020 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
7022 struct page *page = NULL;
7024 if (!lapic_in_kernel(vcpu))
7027 if (!kvm_x86_ops->set_apic_access_page_addr)
7030 page = gfn_to_page(vcpu->kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
7031 if (is_error_page(page))
7033 kvm_x86_ops->set_apic_access_page_addr(vcpu, page_to_phys(page));
7036 * Do not pin apic access page in memory, the MMU notifier
7037 * will call us again if it is migrated or swapped out.
7041 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page);
7044 * Returns 1 to let vcpu_run() continue the guest execution loop without
7045 * exiting to the userspace. Otherwise, the value will be returned to the
7048 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
7052 dm_request_for_irq_injection(vcpu) &&
7053 kvm_cpu_accept_dm_intr(vcpu);
7055 bool req_immediate_exit = false;
7057 if (kvm_request_pending(vcpu)) {
7058 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
7059 kvm_mmu_unload(vcpu);
7060 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
7061 __kvm_migrate_timers(vcpu);
7062 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu))
7063 kvm_gen_update_masterclock(vcpu->kvm);
7064 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu))
7065 kvm_gen_kvmclock_update(vcpu);
7066 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
7067 r = kvm_guest_time_update(vcpu);
7071 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
7072 kvm_mmu_sync_roots(vcpu);
7073 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
7074 kvm_vcpu_flush_tlb(vcpu, true);
7075 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
7076 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
7080 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
7081 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
7082 vcpu->mmio_needed = 0;
7086 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
7087 /* Page is swapped out. Do synthetic halt */
7088 vcpu->arch.apf.halted = true;
7092 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
7093 record_steal_time(vcpu);
7094 if (kvm_check_request(KVM_REQ_SMI, vcpu))
7096 if (kvm_check_request(KVM_REQ_NMI, vcpu))
7098 if (kvm_check_request(KVM_REQ_PMU, vcpu))
7099 kvm_pmu_handle_event(vcpu);
7100 if (kvm_check_request(KVM_REQ_PMI, vcpu))
7101 kvm_pmu_deliver_pmi(vcpu);
7102 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT, vcpu)) {
7103 BUG_ON(vcpu->arch.pending_ioapic_eoi > 255);
7104 if (test_bit(vcpu->arch.pending_ioapic_eoi,
7105 vcpu->arch.ioapic_handled_vectors)) {
7106 vcpu->run->exit_reason = KVM_EXIT_IOAPIC_EOI;
7107 vcpu->run->eoi.vector =
7108 vcpu->arch.pending_ioapic_eoi;
7113 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu))
7114 vcpu_scan_ioapic(vcpu);
7115 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
7116 kvm_vcpu_reload_apic_access_page(vcpu);
7117 if (kvm_check_request(KVM_REQ_HV_CRASH, vcpu)) {
7118 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
7119 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_CRASH;
7123 if (kvm_check_request(KVM_REQ_HV_RESET, vcpu)) {
7124 vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
7125 vcpu->run->system_event.type = KVM_SYSTEM_EVENT_RESET;
7129 if (kvm_check_request(KVM_REQ_HV_EXIT, vcpu)) {
7130 vcpu->run->exit_reason = KVM_EXIT_HYPERV;
7131 vcpu->run->hyperv = vcpu->arch.hyperv.exit;
7137 * KVM_REQ_HV_STIMER has to be processed after
7138 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers
7139 * depend on the guest clock being up-to-date
7141 if (kvm_check_request(KVM_REQ_HV_STIMER, vcpu))
7142 kvm_hv_process_stimers(vcpu);
7145 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
7146 ++vcpu->stat.req_event;
7147 kvm_apic_accept_events(vcpu);
7148 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
7153 if (inject_pending_event(vcpu) != 0)
7154 req_immediate_exit = true;
7156 /* Enable NMI/IRQ window open exits if needed.
7158 * SMIs have two cases: 1) they can be nested, and
7159 * then there is nothing to do here because RSM will
7160 * cause a vmexit anyway; 2) or the SMI can be pending
7161 * because inject_pending_event has completed the
7162 * injection of an IRQ or NMI from the previous vmexit,
7163 * and then we request an immediate exit to inject the SMI.
7165 if (vcpu->arch.smi_pending && !is_smm(vcpu))
7166 req_immediate_exit = true;
7167 if (vcpu->arch.nmi_pending)
7168 kvm_x86_ops->enable_nmi_window(vcpu);
7169 if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win)
7170 kvm_x86_ops->enable_irq_window(vcpu);
7171 WARN_ON(vcpu->arch.exception.pending);
7174 if (kvm_lapic_enabled(vcpu)) {
7175 update_cr8_intercept(vcpu);
7176 kvm_lapic_sync_to_vapic(vcpu);
7180 r = kvm_mmu_reload(vcpu);
7182 goto cancel_injection;
7187 kvm_x86_ops->prepare_guest_switch(vcpu);
7190 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt
7191 * IPI are then delayed after guest entry, which ensures that they
7192 * result in virtual interrupt delivery.
7194 local_irq_disable();
7195 vcpu->mode = IN_GUEST_MODE;
7197 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
7200 * 1) We should set ->mode before checking ->requests. Please see
7201 * the comment in kvm_vcpu_exiting_guest_mode().
7203 * 2) For APICv, we should set ->mode before checking PIR.ON. This
7204 * pairs with the memory barrier implicit in pi_test_and_set_on
7205 * (see vmx_deliver_posted_interrupt).
7207 * 3) This also orders the write to mode from any reads to the page
7208 * tables done while the VCPU is running. Please see the comment
7209 * in kvm_flush_remote_tlbs.
7211 smp_mb__after_srcu_read_unlock();
7214 * This handles the case where a posted interrupt was
7215 * notified with kvm_vcpu_kick.
7217 if (kvm_lapic_enabled(vcpu)) {
7218 if (kvm_x86_ops->sync_pir_to_irr && vcpu->arch.apicv_active)
7219 kvm_x86_ops->sync_pir_to_irr(vcpu);
7222 if (vcpu->mode == EXITING_GUEST_MODE || kvm_request_pending(vcpu)
7223 || need_resched() || signal_pending(current)) {
7224 vcpu->mode = OUTSIDE_GUEST_MODE;
7228 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
7230 goto cancel_injection;
7233 kvm_load_guest_xcr0(vcpu);
7235 if (req_immediate_exit) {
7236 kvm_make_request(KVM_REQ_EVENT, vcpu);
7237 smp_send_reschedule(vcpu->cpu);
7240 trace_kvm_entry(vcpu->vcpu_id);
7241 wait_lapic_expire(vcpu);
7242 guest_enter_irqoff();
7244 if (unlikely(vcpu->arch.switch_db_regs)) {
7246 set_debugreg(vcpu->arch.eff_db[0], 0);
7247 set_debugreg(vcpu->arch.eff_db[1], 1);
7248 set_debugreg(vcpu->arch.eff_db[2], 2);
7249 set_debugreg(vcpu->arch.eff_db[3], 3);
7250 set_debugreg(vcpu->arch.dr6, 6);
7251 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
7252 } else if (unlikely(hw_breakpoint_active())) {
7256 kvm_x86_ops->run(vcpu);
7259 * Do this here before restoring debug registers on the host. And
7260 * since we do this before handling the vmexit, a DR access vmexit
7261 * can (a) read the correct value of the debug registers, (b) set
7262 * KVM_DEBUGREG_WONT_EXIT again.
7264 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) {
7265 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP);
7266 kvm_x86_ops->sync_dirty_debug_regs(vcpu);
7267 kvm_update_dr0123(vcpu);
7268 kvm_update_dr6(vcpu);
7269 kvm_update_dr7(vcpu);
7270 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_RELOAD;
7274 * If the guest has used debug registers, at least dr7
7275 * will be disabled while returning to the host.
7276 * If we don't have active breakpoints in the host, we don't
7277 * care about the messed up debug address registers. But if
7278 * we have some of them active, restore the old state.
7280 if (hw_breakpoint_active())
7281 hw_breakpoint_restore();
7283 vcpu->arch.last_guest_tsc = kvm_read_l1_tsc(vcpu, rdtsc());
7285 vcpu->mode = OUTSIDE_GUEST_MODE;
7288 kvm_put_guest_xcr0(vcpu);
7290 kvm_x86_ops->handle_external_intr(vcpu);
7294 guest_exit_irqoff();
7299 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
7302 * Profile KVM exit RIPs:
7304 if (unlikely(prof_on == KVM_PROFILING)) {
7305 unsigned long rip = kvm_rip_read(vcpu);
7306 profile_hit(KVM_PROFILING, (void *)rip);
7309 if (unlikely(vcpu->arch.tsc_always_catchup))
7310 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
7312 if (vcpu->arch.apic_attention)
7313 kvm_lapic_sync_from_vapic(vcpu);
7315 vcpu->arch.gpa_available = false;
7316 r = kvm_x86_ops->handle_exit(vcpu);
7320 kvm_x86_ops->cancel_injection(vcpu);
7321 if (unlikely(vcpu->arch.apic_attention))
7322 kvm_lapic_sync_from_vapic(vcpu);
7327 static inline int vcpu_block(struct kvm *kvm, struct kvm_vcpu *vcpu)
7329 if (!kvm_arch_vcpu_runnable(vcpu) &&
7330 (!kvm_x86_ops->pre_block || kvm_x86_ops->pre_block(vcpu) == 0)) {
7331 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
7332 kvm_vcpu_block(vcpu);
7333 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
7335 if (kvm_x86_ops->post_block)
7336 kvm_x86_ops->post_block(vcpu);
7338 if (!kvm_check_request(KVM_REQ_UNHALT, vcpu))
7342 kvm_apic_accept_events(vcpu);
7343 switch(vcpu->arch.mp_state) {
7344 case KVM_MP_STATE_HALTED:
7345 vcpu->arch.pv.pv_unhalted = false;
7346 vcpu->arch.mp_state =
7347 KVM_MP_STATE_RUNNABLE;
7348 case KVM_MP_STATE_RUNNABLE:
7349 vcpu->arch.apf.halted = false;
7351 case KVM_MP_STATE_INIT_RECEIVED:
7360 static inline bool kvm_vcpu_running(struct kvm_vcpu *vcpu)
7362 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
7363 kvm_x86_ops->check_nested_events(vcpu);
7365 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
7366 !vcpu->arch.apf.halted);
7369 static int vcpu_run(struct kvm_vcpu *vcpu)
7372 struct kvm *kvm = vcpu->kvm;
7374 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
7375 vcpu->arch.l1tf_flush_l1d = true;
7378 if (kvm_vcpu_running(vcpu)) {
7379 r = vcpu_enter_guest(vcpu);
7381 r = vcpu_block(kvm, vcpu);
7387 kvm_clear_request(KVM_REQ_PENDING_TIMER, vcpu);
7388 if (kvm_cpu_has_pending_timer(vcpu))
7389 kvm_inject_pending_timer_irqs(vcpu);
7391 if (dm_request_for_irq_injection(vcpu) &&
7392 kvm_vcpu_ready_for_interrupt_injection(vcpu)) {
7394 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
7395 ++vcpu->stat.request_irq_exits;
7399 kvm_check_async_pf_completion(vcpu);
7401 if (signal_pending(current)) {
7403 vcpu->run->exit_reason = KVM_EXIT_INTR;
7404 ++vcpu->stat.signal_exits;
7407 if (need_resched()) {
7408 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
7410 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
7414 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
7419 static inline int complete_emulated_io(struct kvm_vcpu *vcpu)
7422 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
7423 r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
7424 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
7425 if (r != EMULATE_DONE)
7430 static int complete_emulated_pio(struct kvm_vcpu *vcpu)
7432 BUG_ON(!vcpu->arch.pio.count);
7434 return complete_emulated_io(vcpu);
7438 * Implements the following, as a state machine:
7442 * for each mmio piece in the fragment
7450 * for each mmio piece in the fragment
7455 static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
7457 struct kvm_run *run = vcpu->run;
7458 struct kvm_mmio_fragment *frag;
7461 BUG_ON(!vcpu->mmio_needed);
7463 /* Complete previous fragment */
7464 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
7465 len = min(8u, frag->len);
7466 if (!vcpu->mmio_is_write)
7467 memcpy(frag->data, run->mmio.data, len);
7469 if (frag->len <= 8) {
7470 /* Switch to the next fragment. */
7472 vcpu->mmio_cur_fragment++;
7474 /* Go forward to the next mmio piece. */
7480 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) {
7481 vcpu->mmio_needed = 0;
7483 /* FIXME: return into emulator if single-stepping. */
7484 if (vcpu->mmio_is_write)
7486 vcpu->mmio_read_completed = 1;
7487 return complete_emulated_io(vcpu);
7490 run->exit_reason = KVM_EXIT_MMIO;
7491 run->mmio.phys_addr = frag->gpa;
7492 if (vcpu->mmio_is_write)
7493 memcpy(run->mmio.data, frag->data, min(8u, frag->len));
7494 run->mmio.len = min(8u, frag->len);
7495 run->mmio.is_write = vcpu->mmio_is_write;
7496 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
7501 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
7505 kvm_sigset_activate(vcpu);
7507 kvm_load_guest_fpu(vcpu);
7509 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
7510 if (kvm_run->immediate_exit) {
7514 kvm_vcpu_block(vcpu);
7515 kvm_apic_accept_events(vcpu);
7516 kvm_clear_request(KVM_REQ_UNHALT, vcpu);
7518 if (signal_pending(current)) {
7520 vcpu->run->exit_reason = KVM_EXIT_INTR;
7521 ++vcpu->stat.signal_exits;
7526 /* re-sync apic's tpr */
7527 if (!lapic_in_kernel(vcpu)) {
7528 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
7534 if (unlikely(vcpu->arch.complete_userspace_io)) {
7535 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io;
7536 vcpu->arch.complete_userspace_io = NULL;
7541 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
7543 if (kvm_run->immediate_exit)
7549 kvm_put_guest_fpu(vcpu);
7550 post_kvm_run_save(vcpu);
7551 kvm_sigset_deactivate(vcpu);
7556 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
7558 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
7560 * We are here if userspace calls get_regs() in the middle of
7561 * instruction emulation. Registers state needs to be copied
7562 * back from emulation context to vcpu. Userspace shouldn't do
7563 * that usually, but some bad designed PV devices (vmware
7564 * backdoor interface) need this to work
7566 emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt);
7567 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
7569 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
7570 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
7571 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
7572 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
7573 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
7574 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
7575 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
7576 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
7577 #ifdef CONFIG_X86_64
7578 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
7579 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
7580 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
7581 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
7582 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
7583 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
7584 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
7585 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
7588 regs->rip = kvm_rip_read(vcpu);
7589 regs->rflags = kvm_get_rflags(vcpu);
7594 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
7596 vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
7597 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
7599 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
7600 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
7601 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
7602 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
7603 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
7604 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
7605 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
7606 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
7607 #ifdef CONFIG_X86_64
7608 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
7609 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
7610 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
7611 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
7612 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
7613 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
7614 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
7615 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
7618 kvm_rip_write(vcpu, regs->rip);
7619 kvm_set_rflags(vcpu, regs->rflags | X86_EFLAGS_FIXED);
7621 vcpu->arch.exception.pending = false;
7623 kvm_make_request(KVM_REQ_EVENT, vcpu);
7628 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
7630 struct kvm_segment cs;
7632 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
7636 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
7638 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
7639 struct kvm_sregs *sregs)
7643 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
7644 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
7645 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
7646 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
7647 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
7648 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
7650 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
7651 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
7653 kvm_x86_ops->get_idt(vcpu, &dt);
7654 sregs->idt.limit = dt.size;
7655 sregs->idt.base = dt.address;
7656 kvm_x86_ops->get_gdt(vcpu, &dt);
7657 sregs->gdt.limit = dt.size;
7658 sregs->gdt.base = dt.address;
7660 sregs->cr0 = kvm_read_cr0(vcpu);
7661 sregs->cr2 = vcpu->arch.cr2;
7662 sregs->cr3 = kvm_read_cr3(vcpu);
7663 sregs->cr4 = kvm_read_cr4(vcpu);
7664 sregs->cr8 = kvm_get_cr8(vcpu);
7665 sregs->efer = vcpu->arch.efer;
7666 sregs->apic_base = kvm_get_apic_base(vcpu);
7668 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
7670 if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
7671 set_bit(vcpu->arch.interrupt.nr,
7672 (unsigned long *)sregs->interrupt_bitmap);
7677 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
7678 struct kvm_mp_state *mp_state)
7680 if (kvm_mpx_supported())
7681 kvm_load_guest_fpu(vcpu);
7683 kvm_apic_accept_events(vcpu);
7684 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED &&
7685 vcpu->arch.pv.pv_unhalted)
7686 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
7688 mp_state->mp_state = vcpu->arch.mp_state;
7690 if (kvm_mpx_supported())
7691 kvm_put_guest_fpu(vcpu);
7695 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
7696 struct kvm_mp_state *mp_state)
7698 if (!lapic_in_kernel(vcpu) &&
7699 mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
7702 /* INITs are latched while in SMM */
7703 if ((is_smm(vcpu) || vcpu->arch.smi_pending) &&
7704 (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED ||
7705 mp_state->mp_state == KVM_MP_STATE_INIT_RECEIVED))
7708 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
7709 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
7710 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events);
7712 vcpu->arch.mp_state = mp_state->mp_state;
7713 kvm_make_request(KVM_REQ_EVENT, vcpu);
7717 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
7718 int reason, bool has_error_code, u32 error_code)
7720 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
7723 init_emulate_ctxt(vcpu);
7725 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
7726 has_error_code, error_code);
7729 return EMULATE_FAIL;
7731 kvm_rip_write(vcpu, ctxt->eip);
7732 kvm_set_rflags(vcpu, ctxt->eflags);
7733 kvm_make_request(KVM_REQ_EVENT, vcpu);
7734 return EMULATE_DONE;
7736 EXPORT_SYMBOL_GPL(kvm_task_switch);
7738 int kvm_valid_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
7740 if ((sregs->efer & EFER_LME) && (sregs->cr0 & X86_CR0_PG)) {
7742 * When EFER.LME and CR0.PG are set, the processor is in
7743 * 64-bit mode (though maybe in a 32-bit code segment).
7744 * CR4.PAE and EFER.LMA must be set.
7746 if (!(sregs->cr4 & X86_CR4_PAE)
7747 || !(sregs->efer & EFER_LMA))
7751 * Not in 64-bit mode: EFER.LMA is clear and the code
7752 * segment cannot be 64-bit.
7754 if (sregs->efer & EFER_LMA || sregs->cs.l)
7761 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
7762 struct kvm_sregs *sregs)
7764 struct msr_data apic_base_msr;
7765 int mmu_reset_needed = 0;
7766 int cpuid_update_needed = 0;
7767 int pending_vec, max_bits, idx;
7770 if (!guest_cpuid_has(vcpu, X86_FEATURE_XSAVE) &&
7771 (sregs->cr4 & X86_CR4_OSXSAVE))
7774 if (kvm_valid_sregs(vcpu, sregs))
7777 apic_base_msr.data = sregs->apic_base;
7778 apic_base_msr.host_initiated = true;
7779 if (kvm_set_apic_base(vcpu, &apic_base_msr))
7782 dt.size = sregs->idt.limit;
7783 dt.address = sregs->idt.base;
7784 kvm_x86_ops->set_idt(vcpu, &dt);
7785 dt.size = sregs->gdt.limit;
7786 dt.address = sregs->gdt.base;
7787 kvm_x86_ops->set_gdt(vcpu, &dt);
7789 vcpu->arch.cr2 = sregs->cr2;
7790 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
7791 vcpu->arch.cr3 = sregs->cr3;
7792 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
7794 kvm_set_cr8(vcpu, sregs->cr8);
7796 mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
7797 kvm_x86_ops->set_efer(vcpu, sregs->efer);
7799 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
7800 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
7801 vcpu->arch.cr0 = sregs->cr0;
7803 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
7804 cpuid_update_needed |= ((kvm_read_cr4(vcpu) ^ sregs->cr4) &
7805 (X86_CR4_OSXSAVE | X86_CR4_PKE));
7806 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
7807 if (cpuid_update_needed)
7808 kvm_update_cpuid(vcpu);
7810 idx = srcu_read_lock(&vcpu->kvm->srcu);
7811 if (is_pae_paging(vcpu)) {
7812 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
7813 mmu_reset_needed = 1;
7815 srcu_read_unlock(&vcpu->kvm->srcu, idx);
7817 if (mmu_reset_needed)
7818 kvm_mmu_reset_context(vcpu);
7820 max_bits = KVM_NR_INTERRUPTS;
7821 pending_vec = find_first_bit(
7822 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
7823 if (pending_vec < max_bits) {
7824 kvm_queue_interrupt(vcpu, pending_vec, false);
7825 pr_debug("Set back pending irq %d\n", pending_vec);
7828 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
7829 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
7830 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
7831 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
7832 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
7833 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
7835 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
7836 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
7838 update_cr8_intercept(vcpu);
7840 /* Older userspace won't unhalt the vcpu on reset. */
7841 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
7842 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
7844 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
7846 kvm_make_request(KVM_REQ_EVENT, vcpu);
7851 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
7852 struct kvm_guest_debug *dbg)
7854 unsigned long rflags;
7857 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
7859 if (vcpu->arch.exception.pending)
7861 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
7862 kvm_queue_exception(vcpu, DB_VECTOR);
7864 kvm_queue_exception(vcpu, BP_VECTOR);
7868 * Read rflags as long as potentially injected trace flags are still
7871 rflags = kvm_get_rflags(vcpu);
7873 vcpu->guest_debug = dbg->control;
7874 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
7875 vcpu->guest_debug = 0;
7877 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
7878 for (i = 0; i < KVM_NR_DB_REGS; ++i)
7879 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
7880 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7];
7882 for (i = 0; i < KVM_NR_DB_REGS; i++)
7883 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
7885 kvm_update_dr7(vcpu);
7887 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
7888 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
7889 get_segment_base(vcpu, VCPU_SREG_CS);
7892 * Trigger an rflags update that will inject or remove the trace
7895 kvm_set_rflags(vcpu, rflags);
7897 kvm_x86_ops->update_bp_intercept(vcpu);
7907 * Translate a guest virtual address to a guest physical address.
7909 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
7910 struct kvm_translation *tr)
7912 unsigned long vaddr = tr->linear_address;
7916 idx = srcu_read_lock(&vcpu->kvm->srcu);
7917 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
7918 srcu_read_unlock(&vcpu->kvm->srcu, idx);
7919 tr->physical_address = gpa;
7920 tr->valid = gpa != UNMAPPED_GVA;
7927 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
7929 struct fxregs_state *fxsave =
7930 &vcpu->arch.guest_fpu.state.fxsave;
7932 memcpy(fpu->fpr, fxsave->st_space, 128);
7933 fpu->fcw = fxsave->cwd;
7934 fpu->fsw = fxsave->swd;
7935 fpu->ftwx = fxsave->twd;
7936 fpu->last_opcode = fxsave->fop;
7937 fpu->last_ip = fxsave->rip;
7938 fpu->last_dp = fxsave->rdp;
7939 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
7944 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
7946 struct fxregs_state *fxsave =
7947 &vcpu->arch.guest_fpu.state.fxsave;
7949 memcpy(fxsave->st_space, fpu->fpr, 128);
7950 fxsave->cwd = fpu->fcw;
7951 fxsave->swd = fpu->fsw;
7952 fxsave->twd = fpu->ftwx;
7953 fxsave->fop = fpu->last_opcode;
7954 fxsave->rip = fpu->last_ip;
7955 fxsave->rdp = fpu->last_dp;
7956 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
7961 static void fx_init(struct kvm_vcpu *vcpu)
7963 fpstate_init(&vcpu->arch.guest_fpu.state);
7964 if (boot_cpu_has(X86_FEATURE_XSAVES))
7965 vcpu->arch.guest_fpu.state.xsave.header.xcomp_bv =
7966 host_xcr0 | XSTATE_COMPACTION_ENABLED;
7969 * Ensure guest xcr0 is valid for loading
7971 vcpu->arch.xcr0 = XFEATURE_MASK_FP;
7973 vcpu->arch.cr0 |= X86_CR0_ET;
7976 /* Swap (qemu) user FPU context for the guest FPU context. */
7977 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
7980 copy_fpregs_to_fpstate(&vcpu->arch.user_fpu);
7981 /* PKRU is separately restored in kvm_x86_ops->run. */
7982 __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu.state,
7983 ~XFEATURE_MASK_PKRU);
7988 /* When vcpu_run ends, restore user space FPU context. */
7989 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
7992 copy_fpregs_to_fpstate(&vcpu->arch.guest_fpu);
7993 copy_kernel_to_fpregs(&vcpu->arch.user_fpu.state);
7995 ++vcpu->stat.fpu_reload;
7999 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
8001 void *wbinvd_dirty_mask = vcpu->arch.wbinvd_dirty_mask;
8003 kvmclock_reset(vcpu);
8005 kvm_x86_ops->vcpu_free(vcpu);
8006 free_cpumask_var(wbinvd_dirty_mask);
8009 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
8012 struct kvm_vcpu *vcpu;
8014 if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
8015 printk_once(KERN_WARNING
8016 "kvm: SMP vm created on host with unstable TSC; "
8017 "guest TSC will not be reliable\n");
8019 vcpu = kvm_x86_ops->vcpu_create(kvm, id);
8024 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
8028 vcpu->arch.arch_capabilities = kvm_get_arch_capabilities();
8029 kvm_vcpu_mtrr_init(vcpu);
8030 r = vcpu_load(vcpu);
8033 kvm_vcpu_reset(vcpu, false);
8034 kvm_mmu_setup(vcpu);
8039 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
8041 struct msr_data msr;
8042 struct kvm *kvm = vcpu->kvm;
8044 kvm_hv_vcpu_postcreate(vcpu);
8046 if (vcpu_load(vcpu))
8049 msr.index = MSR_IA32_TSC;
8050 msr.host_initiated = true;
8051 kvm_write_tsc(vcpu, &msr);
8054 if (!kvmclock_periodic_sync)
8057 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
8058 KVMCLOCK_SYNC_PERIOD);
8061 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
8064 vcpu->arch.apf.msr_val = 0;
8066 r = vcpu_load(vcpu);
8068 kvm_mmu_unload(vcpu);
8071 kvm_arch_vcpu_free(vcpu);
8074 void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
8076 kvm_lapic_reset(vcpu, init_event);
8078 vcpu->arch.hflags = 0;
8080 vcpu->arch.smi_pending = 0;
8081 atomic_set(&vcpu->arch.nmi_queued, 0);
8082 vcpu->arch.nmi_pending = 0;
8083 vcpu->arch.nmi_injected = false;
8084 kvm_clear_interrupt_queue(vcpu);
8085 kvm_clear_exception_queue(vcpu);
8086 vcpu->arch.exception.pending = false;
8088 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
8089 kvm_update_dr0123(vcpu);
8090 vcpu->arch.dr6 = DR6_INIT;
8091 kvm_update_dr6(vcpu);
8092 vcpu->arch.dr7 = DR7_FIXED_1;
8093 kvm_update_dr7(vcpu);
8097 kvm_make_request(KVM_REQ_EVENT, vcpu);
8098 vcpu->arch.apf.msr_val = 0;
8099 vcpu->arch.st.msr_val = 0;
8101 kvmclock_reset(vcpu);
8103 kvm_clear_async_pf_completion_queue(vcpu);
8104 kvm_async_pf_hash_reset(vcpu);
8105 vcpu->arch.apf.halted = false;
8108 kvm_pmu_reset(vcpu);
8109 vcpu->arch.smbase = 0x30000;
8111 vcpu->arch.msr_platform_info = MSR_PLATFORM_INFO_CPUID_FAULT;
8112 vcpu->arch.msr_misc_features_enables = 0;
8115 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
8116 vcpu->arch.regs_avail = ~0;
8117 vcpu->arch.regs_dirty = ~0;
8119 kvm_x86_ops->vcpu_reset(vcpu, init_event);
8122 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
8124 struct kvm_segment cs;
8126 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
8127 cs.selector = vector << 8;
8128 cs.base = vector << 12;
8129 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
8130 kvm_rip_write(vcpu, 0);
8133 int kvm_arch_hardware_enable(void)
8136 struct kvm_vcpu *vcpu;
8141 bool stable, backwards_tsc = false;
8143 kvm_shared_msr_cpu_online();
8144 ret = kvm_x86_ops->hardware_enable();
8148 local_tsc = rdtsc();
8149 stable = !check_tsc_unstable();
8150 list_for_each_entry(kvm, &vm_list, vm_list) {
8151 kvm_for_each_vcpu(i, vcpu, kvm) {
8152 if (!stable && vcpu->cpu == smp_processor_id())
8153 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
8154 if (stable && vcpu->arch.last_host_tsc > local_tsc) {
8155 backwards_tsc = true;
8156 if (vcpu->arch.last_host_tsc > max_tsc)
8157 max_tsc = vcpu->arch.last_host_tsc;
8163 * Sometimes, even reliable TSCs go backwards. This happens on
8164 * platforms that reset TSC during suspend or hibernate actions, but
8165 * maintain synchronization. We must compensate. Fortunately, we can
8166 * detect that condition here, which happens early in CPU bringup,
8167 * before any KVM threads can be running. Unfortunately, we can't
8168 * bring the TSCs fully up to date with real time, as we aren't yet far
8169 * enough into CPU bringup that we know how much real time has actually
8170 * elapsed; our helper function, ktime_get_boot_ns() will be using boot
8171 * variables that haven't been updated yet.
8173 * So we simply find the maximum observed TSC above, then record the
8174 * adjustment to TSC in each VCPU. When the VCPU later gets loaded,
8175 * the adjustment will be applied. Note that we accumulate
8176 * adjustments, in case multiple suspend cycles happen before some VCPU
8177 * gets a chance to run again. In the event that no KVM threads get a
8178 * chance to run, we will miss the entire elapsed period, as we'll have
8179 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
8180 * loose cycle time. This isn't too big a deal, since the loss will be
8181 * uniform across all VCPUs (not to mention the scenario is extremely
8182 * unlikely). It is possible that a second hibernate recovery happens
8183 * much faster than a first, causing the observed TSC here to be
8184 * smaller; this would require additional padding adjustment, which is
8185 * why we set last_host_tsc to the local tsc observed here.
8187 * N.B. - this code below runs only on platforms with reliable TSC,
8188 * as that is the only way backwards_tsc is set above. Also note
8189 * that this runs for ALL vcpus, which is not a bug; all VCPUs should
8190 * have the same delta_cyc adjustment applied if backwards_tsc
8191 * is detected. Note further, this adjustment is only done once,
8192 * as we reset last_host_tsc on all VCPUs to stop this from being
8193 * called multiple times (one for each physical CPU bringup).
8195 * Platforms with unreliable TSCs don't have to deal with this, they
8196 * will be compensated by the logic in vcpu_load, which sets the TSC to
8197 * catchup mode. This will catchup all VCPUs to real time, but cannot
8198 * guarantee that they stay in perfect synchronization.
8200 if (backwards_tsc) {
8201 u64 delta_cyc = max_tsc - local_tsc;
8202 list_for_each_entry(kvm, &vm_list, vm_list) {
8203 kvm->arch.backwards_tsc_observed = true;
8204 kvm_for_each_vcpu(i, vcpu, kvm) {
8205 vcpu->arch.tsc_offset_adjustment += delta_cyc;
8206 vcpu->arch.last_host_tsc = local_tsc;
8207 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
8211 * We have to disable TSC offset matching.. if you were
8212 * booting a VM while issuing an S4 host suspend....
8213 * you may have some problem. Solving this issue is
8214 * left as an exercise to the reader.
8216 kvm->arch.last_tsc_nsec = 0;
8217 kvm->arch.last_tsc_write = 0;
8224 void kvm_arch_hardware_disable(void)
8226 kvm_x86_ops->hardware_disable();
8227 drop_user_return_notifiers();
8230 int kvm_arch_hardware_setup(void)
8234 r = kvm_x86_ops->hardware_setup();
8238 if (kvm_has_tsc_control) {
8240 * Make sure the user can only configure tsc_khz values that
8241 * fit into a signed integer.
8242 * A min value is not calculated needed because it will always
8243 * be 1 on all machines.
8245 u64 max = min(0x7fffffffULL,
8246 __scale_tsc(kvm_max_tsc_scaling_ratio, tsc_khz));
8247 kvm_max_guest_tsc_khz = max;
8249 kvm_default_tsc_scaling_ratio = 1ULL << kvm_tsc_scaling_ratio_frac_bits;
8252 kvm_init_msr_list();
8256 void kvm_arch_hardware_unsetup(void)
8258 kvm_x86_ops->hardware_unsetup();
8261 void kvm_arch_check_processor_compat(void *rtn)
8263 kvm_x86_ops->check_processor_compatibility(rtn);
8266 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu *vcpu)
8268 return vcpu->kvm->arch.bsp_vcpu_id == vcpu->vcpu_id;
8270 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp);
8272 bool kvm_vcpu_is_bsp(struct kvm_vcpu *vcpu)
8274 return (vcpu->arch.apic_base & MSR_IA32_APICBASE_BSP) != 0;
8277 struct static_key kvm_no_apic_vcpu __read_mostly;
8278 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu);
8280 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
8286 BUG_ON(vcpu->kvm == NULL);
8289 vcpu->arch.apicv_active = kvm_x86_ops->get_enable_apicv(vcpu);
8290 vcpu->arch.pv.pv_unhalted = false;
8291 vcpu->arch.emulate_ctxt.ops = &emulate_ops;
8292 if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_reset_bsp(vcpu))
8293 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
8295 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
8297 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
8302 vcpu->arch.pio_data = page_address(page);
8304 kvm_set_tsc_khz(vcpu, max_tsc_khz);
8306 r = kvm_mmu_create(vcpu);
8308 goto fail_free_pio_data;
8310 if (irqchip_in_kernel(kvm)) {
8311 r = kvm_create_lapic(vcpu);
8313 goto fail_mmu_destroy;
8315 static_key_slow_inc(&kvm_no_apic_vcpu);
8317 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
8319 if (!vcpu->arch.mce_banks) {
8321 goto fail_free_lapic;
8323 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
8325 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) {
8327 goto fail_free_mce_banks;
8332 vcpu->arch.ia32_tsc_adjust_msr = 0x0;
8333 vcpu->arch.pv_time_enabled = false;
8335 vcpu->arch.guest_supported_xcr0 = 0;
8336 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
8338 vcpu->arch.maxphyaddr = cpuid_query_maxphyaddr(vcpu);
8340 vcpu->arch.pat = MSR_IA32_CR_PAT_DEFAULT;
8342 kvm_async_pf_hash_reset(vcpu);
8345 vcpu->arch.pending_external_vector = -1;
8346 vcpu->arch.preempted_in_kernel = false;
8348 kvm_hv_vcpu_init(vcpu);
8352 fail_free_mce_banks:
8353 kfree(vcpu->arch.mce_banks);
8355 kvm_free_lapic(vcpu);
8357 kvm_mmu_destroy(vcpu);
8359 free_page((unsigned long)vcpu->arch.pio_data);
8364 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
8368 kvm_hv_vcpu_uninit(vcpu);
8369 kvm_pmu_destroy(vcpu);
8370 kfree(vcpu->arch.mce_banks);
8371 kvm_free_lapic(vcpu);
8372 idx = srcu_read_lock(&vcpu->kvm->srcu);
8373 kvm_mmu_destroy(vcpu);
8374 srcu_read_unlock(&vcpu->kvm->srcu, idx);
8375 free_page((unsigned long)vcpu->arch.pio_data);
8376 if (!lapic_in_kernel(vcpu))
8377 static_key_slow_dec(&kvm_no_apic_vcpu);
8380 void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
8382 vcpu->arch.l1tf_flush_l1d = true;
8383 kvm_x86_ops->sched_in(vcpu, cpu);
8386 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
8391 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list);
8392 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
8393 INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
8394 INIT_LIST_HEAD(&kvm->arch.lpage_disallowed_mmu_pages);
8395 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
8396 atomic_set(&kvm->arch.noncoherent_dma_count, 0);
8398 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
8399 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
8400 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
8401 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
8402 &kvm->arch.irq_sources_bitmap);
8404 raw_spin_lock_init(&kvm->arch.tsc_write_lock);
8405 mutex_init(&kvm->arch.apic_map_lock);
8406 mutex_init(&kvm->arch.hyperv.hv_lock);
8407 spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock);
8409 kvm->arch.kvmclock_offset = -ktime_get_boot_ns();
8410 pvclock_update_vm_gtod_copy(kvm);
8412 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn);
8413 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn);
8415 kvm_page_track_init(kvm);
8416 kvm_mmu_init_vm(kvm);
8418 if (kvm_x86_ops->vm_init)
8419 return kvm_x86_ops->vm_init(kvm);
8424 int kvm_arch_post_init_vm(struct kvm *kvm)
8426 return kvm_mmu_post_init_vm(kvm);
8429 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
8432 r = vcpu_load(vcpu);
8434 kvm_mmu_unload(vcpu);
8438 static void kvm_free_vcpus(struct kvm *kvm)
8441 struct kvm_vcpu *vcpu;
8444 * Unpin any mmu pages first.
8446 kvm_for_each_vcpu(i, vcpu, kvm) {
8447 kvm_clear_async_pf_completion_queue(vcpu);
8448 kvm_unload_vcpu_mmu(vcpu);
8450 kvm_for_each_vcpu(i, vcpu, kvm)
8451 kvm_arch_vcpu_free(vcpu);
8453 mutex_lock(&kvm->lock);
8454 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
8455 kvm->vcpus[i] = NULL;
8457 atomic_set(&kvm->online_vcpus, 0);
8458 mutex_unlock(&kvm->lock);
8461 void kvm_arch_sync_events(struct kvm *kvm)
8463 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work);
8464 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work);
8468 int __x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size)
8472 struct kvm_memslots *slots = kvm_memslots(kvm);
8473 struct kvm_memory_slot *slot, old;
8475 /* Called with kvm->slots_lock held. */
8476 if (WARN_ON(id >= KVM_MEM_SLOTS_NUM))
8479 slot = id_to_memslot(slots, id);
8485 * MAP_SHARED to prevent internal slot pages from being moved
8488 hva = vm_mmap(NULL, 0, size, PROT_READ | PROT_WRITE,
8489 MAP_SHARED | MAP_ANONYMOUS, 0);
8490 if (IS_ERR((void *)hva))
8491 return PTR_ERR((void *)hva);
8500 for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
8501 struct kvm_userspace_memory_region m;
8503 m.slot = id | (i << 16);
8505 m.guest_phys_addr = gpa;
8506 m.userspace_addr = hva;
8507 m.memory_size = size;
8508 r = __kvm_set_memory_region(kvm, &m);
8514 vm_munmap(old.userspace_addr, old.npages * PAGE_SIZE);
8518 EXPORT_SYMBOL_GPL(__x86_set_memory_region);
8520 int x86_set_memory_region(struct kvm *kvm, int id, gpa_t gpa, u32 size)
8524 mutex_lock(&kvm->slots_lock);
8525 r = __x86_set_memory_region(kvm, id, gpa, size);
8526 mutex_unlock(&kvm->slots_lock);
8530 EXPORT_SYMBOL_GPL(x86_set_memory_region);
8532 void kvm_arch_pre_destroy_vm(struct kvm *kvm)
8534 kvm_mmu_pre_destroy_vm(kvm);
8537 void kvm_arch_destroy_vm(struct kvm *kvm)
8539 if (current->mm == kvm->mm) {
8541 * Free memory regions allocated on behalf of userspace,
8542 * unless the the memory map has changed due to process exit
8545 x86_set_memory_region(kvm, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT, 0, 0);
8546 x86_set_memory_region(kvm, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT, 0, 0);
8547 x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0);
8549 if (kvm_x86_ops->vm_destroy)
8550 kvm_x86_ops->vm_destroy(kvm);
8551 kvm_pic_destroy(kvm);
8552 kvm_ioapic_destroy(kvm);
8553 kvm_free_vcpus(kvm);
8554 kvfree(rcu_dereference_check(kvm->arch.apic_map, 1));
8555 kvm_mmu_uninit_vm(kvm);
8556 kvm_page_track_cleanup(kvm);
8559 void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
8560 struct kvm_memory_slot *dont)
8564 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
8565 if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) {
8566 kvfree(free->arch.rmap[i]);
8567 free->arch.rmap[i] = NULL;
8572 if (!dont || free->arch.lpage_info[i - 1] !=
8573 dont->arch.lpage_info[i - 1]) {
8574 kvfree(free->arch.lpage_info[i - 1]);
8575 free->arch.lpage_info[i - 1] = NULL;
8579 kvm_page_track_free_memslot(free, dont);
8582 int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
8583 unsigned long npages)
8588 * Clear out the previous array pointers for the KVM_MR_MOVE case. The
8589 * old arrays will be freed by __kvm_set_memory_region() if installing
8590 * the new memslot is successful.
8592 memset(&slot->arch, 0, sizeof(slot->arch));
8594 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
8595 struct kvm_lpage_info *linfo;
8600 lpages = gfn_to_index(slot->base_gfn + npages - 1,
8601 slot->base_gfn, level) + 1;
8603 slot->arch.rmap[i] =
8604 kvzalloc(lpages * sizeof(*slot->arch.rmap[i]), GFP_KERNEL);
8605 if (!slot->arch.rmap[i])
8610 linfo = kvzalloc(lpages * sizeof(*linfo), GFP_KERNEL);
8614 slot->arch.lpage_info[i - 1] = linfo;
8616 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
8617 linfo[0].disallow_lpage = 1;
8618 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
8619 linfo[lpages - 1].disallow_lpage = 1;
8620 ugfn = slot->userspace_addr >> PAGE_SHIFT;
8622 * If the gfn and userspace address are not aligned wrt each
8623 * other, or if explicitly asked to, disable large page
8624 * support for this slot
8626 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
8627 !kvm_largepages_enabled()) {
8630 for (j = 0; j < lpages; ++j)
8631 linfo[j].disallow_lpage = 1;
8635 if (kvm_page_track_create_memslot(slot, npages))
8641 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
8642 kvfree(slot->arch.rmap[i]);
8643 slot->arch.rmap[i] = NULL;
8647 kvfree(slot->arch.lpage_info[i - 1]);
8648 slot->arch.lpage_info[i - 1] = NULL;
8653 void kvm_arch_memslots_updated(struct kvm *kvm, u64 gen)
8656 * memslots->generation has been incremented.
8657 * mmio generation may have reached its maximum value.
8659 kvm_mmu_invalidate_mmio_sptes(kvm, gen);
8662 int kvm_arch_prepare_memory_region(struct kvm *kvm,
8663 struct kvm_memory_slot *memslot,
8664 const struct kvm_userspace_memory_region *mem,
8665 enum kvm_mr_change change)
8667 if (change == KVM_MR_MOVE)
8668 return kvm_arch_create_memslot(kvm, memslot,
8669 mem->memory_size >> PAGE_SHIFT);
8674 static void kvm_mmu_slot_apply_flags(struct kvm *kvm,
8675 struct kvm_memory_slot *new)
8677 /* Still write protect RO slot */
8678 if (new->flags & KVM_MEM_READONLY) {
8679 kvm_mmu_slot_remove_write_access(kvm, new);
8684 * Call kvm_x86_ops dirty logging hooks when they are valid.
8686 * kvm_x86_ops->slot_disable_log_dirty is called when:
8688 * - KVM_MR_CREATE with dirty logging is disabled
8689 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag
8691 * The reason is, in case of PML, we need to set D-bit for any slots
8692 * with dirty logging disabled in order to eliminate unnecessary GPA
8693 * logging in PML buffer (and potential PML buffer full VMEXT). This
8694 * guarantees leaving PML enabled during guest's lifetime won't have
8695 * any additonal overhead from PML when guest is running with dirty
8696 * logging disabled for memory slots.
8698 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot
8699 * to dirty logging mode.
8701 * If kvm_x86_ops dirty logging hooks are invalid, use write protect.
8703 * In case of write protect:
8705 * Write protect all pages for dirty logging.
8707 * All the sptes including the large sptes which point to this
8708 * slot are set to readonly. We can not create any new large
8709 * spte on this slot until the end of the logging.
8711 * See the comments in fast_page_fault().
8713 if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
8714 if (kvm_x86_ops->slot_enable_log_dirty)
8715 kvm_x86_ops->slot_enable_log_dirty(kvm, new);
8717 kvm_mmu_slot_remove_write_access(kvm, new);
8719 if (kvm_x86_ops->slot_disable_log_dirty)
8720 kvm_x86_ops->slot_disable_log_dirty(kvm, new);
8724 void kvm_arch_commit_memory_region(struct kvm *kvm,
8725 const struct kvm_userspace_memory_region *mem,
8726 const struct kvm_memory_slot *old,
8727 const struct kvm_memory_slot *new,
8728 enum kvm_mr_change change)
8730 int nr_mmu_pages = 0;
8732 if (!kvm->arch.n_requested_mmu_pages)
8733 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
8736 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
8739 * Dirty logging tracks sptes in 4k granularity, meaning that large
8740 * sptes have to be split. If live migration is successful, the guest
8741 * in the source machine will be destroyed and large sptes will be
8742 * created in the destination. However, if the guest continues to run
8743 * in the source machine (for example if live migration fails), small
8744 * sptes will remain around and cause bad performance.
8746 * Scan sptes if dirty logging has been stopped, dropping those
8747 * which can be collapsed into a single large-page spte. Later
8748 * page faults will create the large-page sptes.
8750 if ((change != KVM_MR_DELETE) &&
8751 (old->flags & KVM_MEM_LOG_DIRTY_PAGES) &&
8752 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES))
8753 kvm_mmu_zap_collapsible_sptes(kvm, new);
8756 * Set up write protection and/or dirty logging for the new slot.
8758 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have
8759 * been zapped so no dirty logging staff is needed for old slot. For
8760 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the
8761 * new and it's also covered when dealing with the new slot.
8763 * FIXME: const-ify all uses of struct kvm_memory_slot.
8765 if (change != KVM_MR_DELETE)
8766 kvm_mmu_slot_apply_flags(kvm, (struct kvm_memory_slot *) new);
8769 void kvm_arch_flush_shadow_all(struct kvm *kvm)
8771 kvm_mmu_invalidate_zap_all_pages(kvm);
8774 void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
8775 struct kvm_memory_slot *slot)
8777 kvm_page_track_flush_slot(kvm, slot);
8780 static inline bool kvm_vcpu_has_events(struct kvm_vcpu *vcpu)
8782 if (!list_empty_careful(&vcpu->async_pf.done))
8785 if (kvm_apic_has_events(vcpu))
8788 if (vcpu->arch.pv.pv_unhalted)
8791 if (vcpu->arch.exception.pending)
8794 if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
8795 (vcpu->arch.nmi_pending &&
8796 kvm_x86_ops->nmi_allowed(vcpu)))
8799 if (kvm_test_request(KVM_REQ_SMI, vcpu) ||
8800 (vcpu->arch.smi_pending && !is_smm(vcpu)))
8803 if (kvm_arch_interrupt_allowed(vcpu) &&
8804 kvm_cpu_has_interrupt(vcpu))
8807 if (kvm_hv_has_stimer_pending(vcpu))
8813 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
8815 return kvm_vcpu_running(vcpu) || kvm_vcpu_has_events(vcpu);
8818 bool kvm_arch_dy_runnable(struct kvm_vcpu *vcpu)
8820 if (READ_ONCE(vcpu->arch.pv.pv_unhalted))
8823 if (kvm_test_request(KVM_REQ_NMI, vcpu) ||
8824 kvm_test_request(KVM_REQ_SMI, vcpu) ||
8825 kvm_test_request(KVM_REQ_EVENT, vcpu))
8828 if (vcpu->arch.apicv_active && kvm_x86_ops->dy_apicv_has_pending_interrupt(vcpu))
8834 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
8836 return vcpu->arch.preempted_in_kernel;
8839 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
8841 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
8844 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
8846 return kvm_x86_ops->interrupt_allowed(vcpu);
8849 unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu)
8851 if (is_64_bit_mode(vcpu))
8852 return kvm_rip_read(vcpu);
8853 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) +
8854 kvm_rip_read(vcpu));
8856 EXPORT_SYMBOL_GPL(kvm_get_linear_rip);
8858 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
8860 return kvm_get_linear_rip(vcpu) == linear_rip;
8862 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
8864 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
8866 unsigned long rflags;
8868 rflags = kvm_x86_ops->get_rflags(vcpu);
8869 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
8870 rflags &= ~X86_EFLAGS_TF;
8873 EXPORT_SYMBOL_GPL(kvm_get_rflags);
8875 static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
8877 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
8878 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
8879 rflags |= X86_EFLAGS_TF;
8880 kvm_x86_ops->set_rflags(vcpu, rflags);
8883 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
8885 __kvm_set_rflags(vcpu, rflags);
8886 kvm_make_request(KVM_REQ_EVENT, vcpu);
8888 EXPORT_SYMBOL_GPL(kvm_set_rflags);
8890 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
8894 if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
8898 r = kvm_mmu_reload(vcpu);
8902 if (!vcpu->arch.mmu.direct_map &&
8903 work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
8906 vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
8909 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
8911 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
8914 static inline u32 kvm_async_pf_next_probe(u32 key)
8916 return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
8919 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
8921 u32 key = kvm_async_pf_hash_fn(gfn);
8923 while (vcpu->arch.apf.gfns[key] != ~0)
8924 key = kvm_async_pf_next_probe(key);
8926 vcpu->arch.apf.gfns[key] = gfn;
8929 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
8932 u32 key = kvm_async_pf_hash_fn(gfn);
8934 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
8935 (vcpu->arch.apf.gfns[key] != gfn &&
8936 vcpu->arch.apf.gfns[key] != ~0); i++)
8937 key = kvm_async_pf_next_probe(key);
8942 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
8944 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
8947 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
8951 i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
8953 vcpu->arch.apf.gfns[i] = ~0;
8955 j = kvm_async_pf_next_probe(j);
8956 if (vcpu->arch.apf.gfns[j] == ~0)
8958 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
8960 * k lies cyclically in ]i,j]
8962 * |....j i.k.| or |.k..j i...|
8964 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
8965 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
8970 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
8973 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
8977 static int apf_get_user(struct kvm_vcpu *vcpu, u32 *val)
8980 return kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, val,
8984 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
8985 struct kvm_async_pf *work)
8987 struct x86_exception fault;
8989 trace_kvm_async_pf_not_present(work->arch.token, work->gva);
8990 kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
8992 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
8993 (vcpu->arch.apf.send_user_only &&
8994 kvm_x86_ops->get_cpl(vcpu) == 0))
8995 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
8996 else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
8997 fault.vector = PF_VECTOR;
8998 fault.error_code_valid = true;
8999 fault.error_code = 0;
9000 fault.nested_page_fault = false;
9001 fault.address = work->arch.token;
9002 fault.async_page_fault = true;
9003 kvm_inject_page_fault(vcpu, &fault);
9007 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
9008 struct kvm_async_pf *work)
9010 struct x86_exception fault;
9013 if (work->wakeup_all)
9014 work->arch.token = ~0; /* broadcast wakeup */
9016 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
9017 trace_kvm_async_pf_ready(work->arch.token, work->gva);
9019 if (vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED &&
9020 !apf_get_user(vcpu, &val)) {
9021 if (val == KVM_PV_REASON_PAGE_NOT_PRESENT &&
9022 vcpu->arch.exception.pending &&
9023 vcpu->arch.exception.nr == PF_VECTOR &&
9024 !apf_put_user(vcpu, 0)) {
9025 vcpu->arch.exception.injected = false;
9026 vcpu->arch.exception.pending = false;
9027 vcpu->arch.exception.nr = 0;
9028 vcpu->arch.exception.has_error_code = false;
9029 vcpu->arch.exception.error_code = 0;
9030 } else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
9031 fault.vector = PF_VECTOR;
9032 fault.error_code_valid = true;
9033 fault.error_code = 0;
9034 fault.nested_page_fault = false;
9035 fault.address = work->arch.token;
9036 fault.async_page_fault = true;
9037 kvm_inject_page_fault(vcpu, &fault);
9040 vcpu->arch.apf.halted = false;
9041 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
9044 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
9046 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
9049 return kvm_can_do_async_pf(vcpu);
9052 void kvm_arch_start_assignment(struct kvm *kvm)
9054 atomic_inc(&kvm->arch.assigned_device_count);
9056 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment);
9058 void kvm_arch_end_assignment(struct kvm *kvm)
9060 atomic_dec(&kvm->arch.assigned_device_count);
9062 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment);
9064 bool kvm_arch_has_assigned_device(struct kvm *kvm)
9066 return atomic_read(&kvm->arch.assigned_device_count);
9068 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device);
9070 void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
9072 atomic_inc(&kvm->arch.noncoherent_dma_count);
9074 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma);
9076 void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
9078 atomic_dec(&kvm->arch.noncoherent_dma_count);
9080 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma);
9082 bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
9084 return atomic_read(&kvm->arch.noncoherent_dma_count);
9086 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
9088 bool kvm_arch_has_irq_bypass(void)
9090 return kvm_x86_ops->update_pi_irte != NULL;
9093 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
9094 struct irq_bypass_producer *prod)
9096 struct kvm_kernel_irqfd *irqfd =
9097 container_of(cons, struct kvm_kernel_irqfd, consumer);
9099 irqfd->producer = prod;
9101 return kvm_x86_ops->update_pi_irte(irqfd->kvm,
9102 prod->irq, irqfd->gsi, 1);
9105 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
9106 struct irq_bypass_producer *prod)
9109 struct kvm_kernel_irqfd *irqfd =
9110 container_of(cons, struct kvm_kernel_irqfd, consumer);
9112 WARN_ON(irqfd->producer != prod);
9113 irqfd->producer = NULL;
9116 * When producer of consumer is unregistered, we change back to
9117 * remapped mode, so we can re-use the current implementation
9118 * when the irq is masked/disabled or the consumer side (KVM
9119 * int this case doesn't want to receive the interrupts.
9121 ret = kvm_x86_ops->update_pi_irte(irqfd->kvm, prod->irq, irqfd->gsi, 0);
9123 printk(KERN_INFO "irq bypass consumer (token %p) unregistration"
9124 " fails: %d\n", irqfd->consumer.token, ret);
9127 int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
9128 uint32_t guest_irq, bool set)
9130 if (!kvm_x86_ops->update_pi_irte)
9133 return kvm_x86_ops->update_pi_irte(kvm, host_irq, guest_irq, set);
9136 bool kvm_vector_hashing_enabled(void)
9138 return vector_hashing;
9140 EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled);
9142 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
9143 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio);
9144 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
9145 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
9146 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
9147 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
9148 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
9149 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
9150 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
9151 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
9152 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
9153 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
9154 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
9155 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
9156 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window);
9157 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
9158 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update);
9159 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access);
9160 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi);