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
94 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
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 enter_smm(struct kvm_vcpu
*vcpu
);
102 static void __kvm_set_rflags(struct kvm_vcpu
*vcpu
, unsigned long rflags
);
104 struct kvm_x86_ops
*kvm_x86_ops __read_mostly
;
105 EXPORT_SYMBOL_GPL(kvm_x86_ops
);
107 static bool __read_mostly ignore_msrs
= 0;
108 module_param(ignore_msrs
, bool, S_IRUGO
| S_IWUSR
);
110 unsigned int min_timer_period_us
= 500;
111 module_param(min_timer_period_us
, uint
, S_IRUGO
| S_IWUSR
);
113 static bool __read_mostly kvmclock_periodic_sync
= true;
114 module_param(kvmclock_periodic_sync
, bool, S_IRUGO
);
116 bool __read_mostly kvm_has_tsc_control
;
117 EXPORT_SYMBOL_GPL(kvm_has_tsc_control
);
118 u32 __read_mostly kvm_max_guest_tsc_khz
;
119 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz
);
120 u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits
;
121 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits
);
122 u64 __read_mostly kvm_max_tsc_scaling_ratio
;
123 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio
);
124 u64 __read_mostly kvm_default_tsc_scaling_ratio
;
125 EXPORT_SYMBOL_GPL(kvm_default_tsc_scaling_ratio
);
127 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
128 static u32 __read_mostly tsc_tolerance_ppm
= 250;
129 module_param(tsc_tolerance_ppm
, uint
, S_IRUGO
| S_IWUSR
);
131 /* lapic timer advance (tscdeadline mode only) in nanoseconds */
132 unsigned int __read_mostly lapic_timer_advance_ns
= 0;
133 module_param(lapic_timer_advance_ns
, uint
, S_IRUGO
| S_IWUSR
);
135 static bool __read_mostly vector_hashing
= true;
136 module_param(vector_hashing
, bool, S_IRUGO
);
138 #define KVM_NR_SHARED_MSRS 16
140 struct kvm_shared_msrs_global
{
142 u32 msrs
[KVM_NR_SHARED_MSRS
];
145 struct kvm_shared_msrs
{
146 struct user_return_notifier urn
;
148 struct kvm_shared_msr_values
{
151 } values
[KVM_NR_SHARED_MSRS
];
154 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global
;
155 static struct kvm_shared_msrs __percpu
*shared_msrs
;
157 struct kvm_stats_debugfs_item debugfs_entries
[] = {
158 { "pf_fixed", VCPU_STAT(pf_fixed
) },
159 { "pf_guest", VCPU_STAT(pf_guest
) },
160 { "tlb_flush", VCPU_STAT(tlb_flush
) },
161 { "invlpg", VCPU_STAT(invlpg
) },
162 { "exits", VCPU_STAT(exits
) },
163 { "io_exits", VCPU_STAT(io_exits
) },
164 { "mmio_exits", VCPU_STAT(mmio_exits
) },
165 { "signal_exits", VCPU_STAT(signal_exits
) },
166 { "irq_window", VCPU_STAT(irq_window_exits
) },
167 { "nmi_window", VCPU_STAT(nmi_window_exits
) },
168 { "halt_exits", VCPU_STAT(halt_exits
) },
169 { "halt_successful_poll", VCPU_STAT(halt_successful_poll
) },
170 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll
) },
171 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid
) },
172 { "halt_wakeup", VCPU_STAT(halt_wakeup
) },
173 { "hypercalls", VCPU_STAT(hypercalls
) },
174 { "request_irq", VCPU_STAT(request_irq_exits
) },
175 { "irq_exits", VCPU_STAT(irq_exits
) },
176 { "host_state_reload", VCPU_STAT(host_state_reload
) },
177 { "efer_reload", VCPU_STAT(efer_reload
) },
178 { "fpu_reload", VCPU_STAT(fpu_reload
) },
179 { "insn_emulation", VCPU_STAT(insn_emulation
) },
180 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail
) },
181 { "irq_injections", VCPU_STAT(irq_injections
) },
182 { "nmi_injections", VCPU_STAT(nmi_injections
) },
183 { "req_event", VCPU_STAT(req_event
) },
184 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped
) },
185 { "mmu_pte_write", VM_STAT(mmu_pte_write
) },
186 { "mmu_pte_updated", VM_STAT(mmu_pte_updated
) },
187 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped
) },
188 { "mmu_flooded", VM_STAT(mmu_flooded
) },
189 { "mmu_recycled", VM_STAT(mmu_recycled
) },
190 { "mmu_cache_miss", VM_STAT(mmu_cache_miss
) },
191 { "mmu_unsync", VM_STAT(mmu_unsync
) },
192 { "remote_tlb_flush", VM_STAT(remote_tlb_flush
) },
193 { "largepages", VM_STAT(lpages
) },
194 { "max_mmu_page_hash_collisions",
195 VM_STAT(max_mmu_page_hash_collisions
) },
199 u64 __read_mostly host_xcr0
;
201 static int emulator_fix_hypercall(struct x86_emulate_ctxt
*ctxt
);
203 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu
*vcpu
)
206 for (i
= 0; i
< roundup_pow_of_two(ASYNC_PF_PER_VCPU
); i
++)
207 vcpu
->arch
.apf
.gfns
[i
] = ~0;
210 static void kvm_on_user_return(struct user_return_notifier
*urn
)
213 struct kvm_shared_msrs
*locals
214 = container_of(urn
, struct kvm_shared_msrs
, urn
);
215 struct kvm_shared_msr_values
*values
;
219 * Disabling irqs at this point since the following code could be
220 * interrupted and executed through kvm_arch_hardware_disable()
222 local_irq_save(flags
);
223 if (locals
->registered
) {
224 locals
->registered
= false;
225 user_return_notifier_unregister(urn
);
227 local_irq_restore(flags
);
228 for (slot
= 0; slot
< shared_msrs_global
.nr
; ++slot
) {
229 values
= &locals
->values
[slot
];
230 if (values
->host
!= values
->curr
) {
231 wrmsrl(shared_msrs_global
.msrs
[slot
], values
->host
);
232 values
->curr
= values
->host
;
237 static void shared_msr_update(unsigned slot
, u32 msr
)
240 unsigned int cpu
= smp_processor_id();
241 struct kvm_shared_msrs
*smsr
= per_cpu_ptr(shared_msrs
, cpu
);
243 /* only read, and nobody should modify it at this time,
244 * so don't need lock */
245 if (slot
>= shared_msrs_global
.nr
) {
246 printk(KERN_ERR
"kvm: invalid MSR slot!");
249 rdmsrl_safe(msr
, &value
);
250 smsr
->values
[slot
].host
= value
;
251 smsr
->values
[slot
].curr
= value
;
254 void kvm_define_shared_msr(unsigned slot
, u32 msr
)
256 BUG_ON(slot
>= KVM_NR_SHARED_MSRS
);
257 shared_msrs_global
.msrs
[slot
] = msr
;
258 if (slot
>= shared_msrs_global
.nr
)
259 shared_msrs_global
.nr
= slot
+ 1;
261 EXPORT_SYMBOL_GPL(kvm_define_shared_msr
);
263 static void kvm_shared_msr_cpu_online(void)
267 for (i
= 0; i
< shared_msrs_global
.nr
; ++i
)
268 shared_msr_update(i
, shared_msrs_global
.msrs
[i
]);
271 int kvm_set_shared_msr(unsigned slot
, u64 value
, u64 mask
)
273 unsigned int cpu
= smp_processor_id();
274 struct kvm_shared_msrs
*smsr
= per_cpu_ptr(shared_msrs
, cpu
);
277 if (((value
^ smsr
->values
[slot
].curr
) & mask
) == 0)
279 smsr
->values
[slot
].curr
= value
;
280 err
= wrmsrl_safe(shared_msrs_global
.msrs
[slot
], value
);
284 if (!smsr
->registered
) {
285 smsr
->urn
.on_user_return
= kvm_on_user_return
;
286 user_return_notifier_register(&smsr
->urn
);
287 smsr
->registered
= true;
291 EXPORT_SYMBOL_GPL(kvm_set_shared_msr
);
293 static void drop_user_return_notifiers(void)
295 unsigned int cpu
= smp_processor_id();
296 struct kvm_shared_msrs
*smsr
= per_cpu_ptr(shared_msrs
, cpu
);
298 if (smsr
->registered
)
299 kvm_on_user_return(&smsr
->urn
);
302 u64
kvm_get_apic_base(struct kvm_vcpu
*vcpu
)
304 return vcpu
->arch
.apic_base
;
306 EXPORT_SYMBOL_GPL(kvm_get_apic_base
);
308 int kvm_set_apic_base(struct kvm_vcpu
*vcpu
, struct msr_data
*msr_info
)
310 u64 old_state
= vcpu
->arch
.apic_base
&
311 (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
);
312 u64 new_state
= msr_info
->data
&
313 (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
);
314 u64 reserved_bits
= ((~0ULL) << cpuid_maxphyaddr(vcpu
)) | 0x2ff |
315 (guest_cpuid_has(vcpu
, X86_FEATURE_X2APIC
) ? 0 : X2APIC_ENABLE
);
317 if ((msr_info
->data
& reserved_bits
) || new_state
== X2APIC_ENABLE
)
319 if (!msr_info
->host_initiated
&&
320 ((new_state
== MSR_IA32_APICBASE_ENABLE
&&
321 old_state
== (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
)) ||
322 (new_state
== (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
) &&
326 kvm_lapic_set_base(vcpu
, msr_info
->data
);
329 EXPORT_SYMBOL_GPL(kvm_set_apic_base
);
331 asmlinkage __visible
void kvm_spurious_fault(void)
333 /* Fault while not rebooting. We want the trace. */
336 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
338 #define EXCPT_BENIGN 0
339 #define EXCPT_CONTRIBUTORY 1
342 static int exception_class(int vector
)
352 return EXCPT_CONTRIBUTORY
;
359 #define EXCPT_FAULT 0
361 #define EXCPT_ABORT 2
362 #define EXCPT_INTERRUPT 3
364 static int exception_type(int vector
)
368 if (WARN_ON(vector
> 31 || vector
== NMI_VECTOR
))
369 return EXCPT_INTERRUPT
;
373 /* #DB is trap, as instruction watchpoints are handled elsewhere */
374 if (mask
& ((1 << DB_VECTOR
) | (1 << BP_VECTOR
) | (1 << OF_VECTOR
)))
377 if (mask
& ((1 << DF_VECTOR
) | (1 << MC_VECTOR
)))
380 /* Reserved exceptions will result in fault */
384 static void kvm_multiple_exception(struct kvm_vcpu
*vcpu
,
385 unsigned nr
, bool has_error
, u32 error_code
,
391 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
393 if (!vcpu
->arch
.exception
.pending
&& !vcpu
->arch
.exception
.injected
) {
395 if (has_error
&& !is_protmode(vcpu
))
399 * On vmentry, vcpu->arch.exception.pending is only
400 * true if an event injection was blocked by
401 * nested_run_pending. In that case, however,
402 * vcpu_enter_guest requests an immediate exit,
403 * and the guest shouldn't proceed far enough to
406 WARN_ON_ONCE(vcpu
->arch
.exception
.pending
);
407 vcpu
->arch
.exception
.injected
= true;
409 vcpu
->arch
.exception
.pending
= true;
410 vcpu
->arch
.exception
.injected
= false;
412 vcpu
->arch
.exception
.has_error_code
= has_error
;
413 vcpu
->arch
.exception
.nr
= nr
;
414 vcpu
->arch
.exception
.error_code
= error_code
;
418 /* to check exception */
419 prev_nr
= vcpu
->arch
.exception
.nr
;
420 if (prev_nr
== DF_VECTOR
) {
421 /* triple fault -> shutdown */
422 kvm_make_request(KVM_REQ_TRIPLE_FAULT
, vcpu
);
425 class1
= exception_class(prev_nr
);
426 class2
= exception_class(nr
);
427 if ((class1
== EXCPT_CONTRIBUTORY
&& class2
== EXCPT_CONTRIBUTORY
)
428 || (class1
== EXCPT_PF
&& class2
!= EXCPT_BENIGN
)) {
430 * Generate double fault per SDM Table 5-5. Set
431 * exception.pending = true so that the double fault
432 * can trigger a nested vmexit.
434 vcpu
->arch
.exception
.pending
= true;
435 vcpu
->arch
.exception
.injected
= false;
436 vcpu
->arch
.exception
.has_error_code
= true;
437 vcpu
->arch
.exception
.nr
= DF_VECTOR
;
438 vcpu
->arch
.exception
.error_code
= 0;
440 /* replace previous exception with a new one in a hope
441 that instruction re-execution will regenerate lost
446 void kvm_queue_exception(struct kvm_vcpu
*vcpu
, unsigned nr
)
448 kvm_multiple_exception(vcpu
, nr
, false, 0, false);
450 EXPORT_SYMBOL_GPL(kvm_queue_exception
);
452 void kvm_requeue_exception(struct kvm_vcpu
*vcpu
, unsigned nr
)
454 kvm_multiple_exception(vcpu
, nr
, false, 0, true);
456 EXPORT_SYMBOL_GPL(kvm_requeue_exception
);
458 int kvm_complete_insn_gp(struct kvm_vcpu
*vcpu
, int err
)
461 kvm_inject_gp(vcpu
, 0);
463 return kvm_skip_emulated_instruction(vcpu
);
467 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp
);
469 void kvm_inject_page_fault(struct kvm_vcpu
*vcpu
, struct x86_exception
*fault
)
471 ++vcpu
->stat
.pf_guest
;
472 vcpu
->arch
.exception
.nested_apf
=
473 is_guest_mode(vcpu
) && fault
->async_page_fault
;
474 if (vcpu
->arch
.exception
.nested_apf
)
475 vcpu
->arch
.apf
.nested_apf_token
= fault
->address
;
477 vcpu
->arch
.cr2
= fault
->address
;
478 kvm_queue_exception_e(vcpu
, PF_VECTOR
, fault
->error_code
);
480 EXPORT_SYMBOL_GPL(kvm_inject_page_fault
);
482 static bool kvm_propagate_fault(struct kvm_vcpu
*vcpu
, struct x86_exception
*fault
)
484 if (mmu_is_nested(vcpu
) && !fault
->nested_page_fault
)
485 vcpu
->arch
.nested_mmu
.inject_page_fault(vcpu
, fault
);
487 vcpu
->arch
.mmu
.inject_page_fault(vcpu
, fault
);
489 return fault
->nested_page_fault
;
492 void kvm_inject_nmi(struct kvm_vcpu
*vcpu
)
494 atomic_inc(&vcpu
->arch
.nmi_queued
);
495 kvm_make_request(KVM_REQ_NMI
, vcpu
);
497 EXPORT_SYMBOL_GPL(kvm_inject_nmi
);
499 void kvm_queue_exception_e(struct kvm_vcpu
*vcpu
, unsigned nr
, u32 error_code
)
501 kvm_multiple_exception(vcpu
, nr
, true, error_code
, false);
503 EXPORT_SYMBOL_GPL(kvm_queue_exception_e
);
505 void kvm_requeue_exception_e(struct kvm_vcpu
*vcpu
, unsigned nr
, u32 error_code
)
507 kvm_multiple_exception(vcpu
, nr
, true, error_code
, true);
509 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e
);
512 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
513 * a #GP and return false.
515 bool kvm_require_cpl(struct kvm_vcpu
*vcpu
, int required_cpl
)
517 if (kvm_x86_ops
->get_cpl(vcpu
) <= required_cpl
)
519 kvm_queue_exception_e(vcpu
, GP_VECTOR
, 0);
522 EXPORT_SYMBOL_GPL(kvm_require_cpl
);
524 bool kvm_require_dr(struct kvm_vcpu
*vcpu
, int dr
)
526 if ((dr
!= 4 && dr
!= 5) || !kvm_read_cr4_bits(vcpu
, X86_CR4_DE
))
529 kvm_queue_exception(vcpu
, UD_VECTOR
);
532 EXPORT_SYMBOL_GPL(kvm_require_dr
);
535 * This function will be used to read from the physical memory of the currently
536 * running guest. The difference to kvm_vcpu_read_guest_page is that this function
537 * can read from guest physical or from the guest's guest physical memory.
539 int kvm_read_guest_page_mmu(struct kvm_vcpu
*vcpu
, struct kvm_mmu
*mmu
,
540 gfn_t ngfn
, void *data
, int offset
, int len
,
543 struct x86_exception exception
;
547 ngpa
= gfn_to_gpa(ngfn
);
548 real_gfn
= mmu
->translate_gpa(vcpu
, ngpa
, access
, &exception
);
549 if (real_gfn
== UNMAPPED_GVA
)
552 real_gfn
= gpa_to_gfn(real_gfn
);
554 return kvm_vcpu_read_guest_page(vcpu
, real_gfn
, data
, offset
, len
);
556 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu
);
558 static int kvm_read_nested_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
559 void *data
, int offset
, int len
, u32 access
)
561 return kvm_read_guest_page_mmu(vcpu
, vcpu
->arch
.walk_mmu
, gfn
,
562 data
, offset
, len
, access
);
566 * Load the pae pdptrs. Return true is they are all valid.
568 int load_pdptrs(struct kvm_vcpu
*vcpu
, struct kvm_mmu
*mmu
, unsigned long cr3
)
570 gfn_t pdpt_gfn
= cr3
>> PAGE_SHIFT
;
571 unsigned offset
= ((cr3
& (PAGE_SIZE
-1)) >> 5) << 2;
574 u64 pdpte
[ARRAY_SIZE(mmu
->pdptrs
)];
576 ret
= kvm_read_guest_page_mmu(vcpu
, mmu
, pdpt_gfn
, pdpte
,
577 offset
* sizeof(u64
), sizeof(pdpte
),
578 PFERR_USER_MASK
|PFERR_WRITE_MASK
);
583 for (i
= 0; i
< ARRAY_SIZE(pdpte
); ++i
) {
584 if ((pdpte
[i
] & PT_PRESENT_MASK
) &&
586 vcpu
->arch
.mmu
.guest_rsvd_check
.rsvd_bits_mask
[0][2])) {
593 memcpy(mmu
->pdptrs
, pdpte
, sizeof(mmu
->pdptrs
));
594 __set_bit(VCPU_EXREG_PDPTR
,
595 (unsigned long *)&vcpu
->arch
.regs_avail
);
596 __set_bit(VCPU_EXREG_PDPTR
,
597 (unsigned long *)&vcpu
->arch
.regs_dirty
);
602 EXPORT_SYMBOL_GPL(load_pdptrs
);
604 bool pdptrs_changed(struct kvm_vcpu
*vcpu
)
606 u64 pdpte
[ARRAY_SIZE(vcpu
->arch
.walk_mmu
->pdptrs
)];
612 if (is_long_mode(vcpu
) || !is_pae(vcpu
))
615 if (!test_bit(VCPU_EXREG_PDPTR
,
616 (unsigned long *)&vcpu
->arch
.regs_avail
))
619 gfn
= (kvm_read_cr3(vcpu
) & 0xffffffe0ul
) >> PAGE_SHIFT
;
620 offset
= (kvm_read_cr3(vcpu
) & 0xffffffe0ul
) & (PAGE_SIZE
- 1);
621 r
= kvm_read_nested_guest_page(vcpu
, gfn
, pdpte
, offset
, sizeof(pdpte
),
622 PFERR_USER_MASK
| PFERR_WRITE_MASK
);
625 changed
= memcmp(pdpte
, vcpu
->arch
.walk_mmu
->pdptrs
, sizeof(pdpte
)) != 0;
630 EXPORT_SYMBOL_GPL(pdptrs_changed
);
632 int kvm_set_cr0(struct kvm_vcpu
*vcpu
, unsigned long cr0
)
634 unsigned long old_cr0
= kvm_read_cr0(vcpu
);
635 unsigned long update_bits
= X86_CR0_PG
| X86_CR0_WP
;
640 if (cr0
& 0xffffffff00000000UL
)
644 cr0
&= ~CR0_RESERVED_BITS
;
646 if ((cr0
& X86_CR0_NW
) && !(cr0
& X86_CR0_CD
))
649 if ((cr0
& X86_CR0_PG
) && !(cr0
& X86_CR0_PE
))
652 if (!is_paging(vcpu
) && (cr0
& X86_CR0_PG
)) {
654 if ((vcpu
->arch
.efer
& EFER_LME
)) {
659 kvm_x86_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
664 if (is_pae(vcpu
) && !load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
,
669 if (!(cr0
& X86_CR0_PG
) && kvm_read_cr4_bits(vcpu
, X86_CR4_PCIDE
))
672 kvm_x86_ops
->set_cr0(vcpu
, cr0
);
674 if ((cr0
^ old_cr0
) & X86_CR0_PG
) {
675 kvm_clear_async_pf_completion_queue(vcpu
);
676 kvm_async_pf_hash_reset(vcpu
);
679 if ((cr0
^ old_cr0
) & update_bits
)
680 kvm_mmu_reset_context(vcpu
);
682 if (((cr0
^ old_cr0
) & X86_CR0_CD
) &&
683 kvm_arch_has_noncoherent_dma(vcpu
->kvm
) &&
684 !kvm_check_has_quirk(vcpu
->kvm
, KVM_X86_QUIRK_CD_NW_CLEARED
))
685 kvm_zap_gfn_range(vcpu
->kvm
, 0, ~0ULL);
689 EXPORT_SYMBOL_GPL(kvm_set_cr0
);
691 void kvm_lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
)
693 (void)kvm_set_cr0(vcpu
, kvm_read_cr0_bits(vcpu
, ~0x0eul
) | (msw
& 0x0f));
695 EXPORT_SYMBOL_GPL(kvm_lmsw
);
697 static void kvm_load_guest_xcr0(struct kvm_vcpu
*vcpu
)
699 if (kvm_read_cr4_bits(vcpu
, X86_CR4_OSXSAVE
) &&
700 !vcpu
->guest_xcr0_loaded
) {
701 /* kvm_set_xcr() also depends on this */
702 xsetbv(XCR_XFEATURE_ENABLED_MASK
, vcpu
->arch
.xcr0
);
703 vcpu
->guest_xcr0_loaded
= 1;
707 static void kvm_put_guest_xcr0(struct kvm_vcpu
*vcpu
)
709 if (vcpu
->guest_xcr0_loaded
) {
710 if (vcpu
->arch
.xcr0
!= host_xcr0
)
711 xsetbv(XCR_XFEATURE_ENABLED_MASK
, host_xcr0
);
712 vcpu
->guest_xcr0_loaded
= 0;
716 static int __kvm_set_xcr(struct kvm_vcpu
*vcpu
, u32 index
, u64 xcr
)
719 u64 old_xcr0
= vcpu
->arch
.xcr0
;
722 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
723 if (index
!= XCR_XFEATURE_ENABLED_MASK
)
725 if (!(xcr0
& XFEATURE_MASK_FP
))
727 if ((xcr0
& XFEATURE_MASK_YMM
) && !(xcr0
& XFEATURE_MASK_SSE
))
731 * Do not allow the guest to set bits that we do not support
732 * saving. However, xcr0 bit 0 is always set, even if the
733 * emulated CPU does not support XSAVE (see fx_init).
735 valid_bits
= vcpu
->arch
.guest_supported_xcr0
| XFEATURE_MASK_FP
;
736 if (xcr0
& ~valid_bits
)
739 if ((!(xcr0
& XFEATURE_MASK_BNDREGS
)) !=
740 (!(xcr0
& XFEATURE_MASK_BNDCSR
)))
743 if (xcr0
& XFEATURE_MASK_AVX512
) {
744 if (!(xcr0
& XFEATURE_MASK_YMM
))
746 if ((xcr0
& XFEATURE_MASK_AVX512
) != XFEATURE_MASK_AVX512
)
749 vcpu
->arch
.xcr0
= xcr0
;
751 if ((xcr0
^ old_xcr0
) & XFEATURE_MASK_EXTEND
)
752 kvm_update_cpuid(vcpu
);
756 int kvm_set_xcr(struct kvm_vcpu
*vcpu
, u32 index
, u64 xcr
)
758 if (kvm_x86_ops
->get_cpl(vcpu
) != 0 ||
759 __kvm_set_xcr(vcpu
, index
, xcr
)) {
760 kvm_inject_gp(vcpu
, 0);
765 EXPORT_SYMBOL_GPL(kvm_set_xcr
);
767 int kvm_set_cr4(struct kvm_vcpu
*vcpu
, unsigned long cr4
)
769 unsigned long old_cr4
= kvm_read_cr4(vcpu
);
770 unsigned long pdptr_bits
= X86_CR4_PGE
| X86_CR4_PSE
| X86_CR4_PAE
|
771 X86_CR4_SMEP
| X86_CR4_SMAP
| X86_CR4_PKE
;
773 if (cr4
& CR4_RESERVED_BITS
)
776 if (!guest_cpuid_has(vcpu
, X86_FEATURE_XSAVE
) && (cr4
& X86_CR4_OSXSAVE
))
779 if (!guest_cpuid_has(vcpu
, X86_FEATURE_SMEP
) && (cr4
& X86_CR4_SMEP
))
782 if (!guest_cpuid_has(vcpu
, X86_FEATURE_SMAP
) && (cr4
& X86_CR4_SMAP
))
785 if (!guest_cpuid_has(vcpu
, X86_FEATURE_FSGSBASE
) && (cr4
& X86_CR4_FSGSBASE
))
788 if (!guest_cpuid_has(vcpu
, X86_FEATURE_PKU
) && (cr4
& X86_CR4_PKE
))
791 if (!guest_cpuid_has(vcpu
, X86_FEATURE_LA57
) && (cr4
& X86_CR4_LA57
))
794 if (is_long_mode(vcpu
)) {
795 if (!(cr4
& X86_CR4_PAE
))
797 } else if (is_paging(vcpu
) && (cr4
& X86_CR4_PAE
)
798 && ((cr4
^ old_cr4
) & pdptr_bits
)
799 && !load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
,
803 if ((cr4
& X86_CR4_PCIDE
) && !(old_cr4
& X86_CR4_PCIDE
)) {
804 if (!guest_cpuid_has(vcpu
, X86_FEATURE_PCID
))
807 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
808 if ((kvm_read_cr3(vcpu
) & X86_CR3_PCID_MASK
) || !is_long_mode(vcpu
))
812 if (kvm_x86_ops
->set_cr4(vcpu
, cr4
))
815 if (((cr4
^ old_cr4
) & pdptr_bits
) ||
816 (!(cr4
& X86_CR4_PCIDE
) && (old_cr4
& X86_CR4_PCIDE
)))
817 kvm_mmu_reset_context(vcpu
);
819 if ((cr4
^ old_cr4
) & (X86_CR4_OSXSAVE
| X86_CR4_PKE
))
820 kvm_update_cpuid(vcpu
);
824 EXPORT_SYMBOL_GPL(kvm_set_cr4
);
826 int kvm_set_cr3(struct kvm_vcpu
*vcpu
, unsigned long cr3
)
829 cr3
&= ~CR3_PCID_INVD
;
832 if (cr3
== kvm_read_cr3(vcpu
) && !pdptrs_changed(vcpu
)) {
833 kvm_mmu_sync_roots(vcpu
);
834 kvm_make_request(KVM_REQ_TLB_FLUSH
, vcpu
);
838 if (is_long_mode(vcpu
) &&
839 (cr3
& rsvd_bits(cpuid_maxphyaddr(vcpu
), 62)))
841 else if (is_pae(vcpu
) && is_paging(vcpu
) &&
842 !load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
, cr3
))
845 vcpu
->arch
.cr3
= cr3
;
846 __set_bit(VCPU_EXREG_CR3
, (ulong
*)&vcpu
->arch
.regs_avail
);
847 kvm_mmu_new_cr3(vcpu
);
850 EXPORT_SYMBOL_GPL(kvm_set_cr3
);
852 int kvm_set_cr8(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
854 if (cr8
& CR8_RESERVED_BITS
)
856 if (lapic_in_kernel(vcpu
))
857 kvm_lapic_set_tpr(vcpu
, cr8
);
859 vcpu
->arch
.cr8
= cr8
;
862 EXPORT_SYMBOL_GPL(kvm_set_cr8
);
864 unsigned long kvm_get_cr8(struct kvm_vcpu
*vcpu
)
866 if (lapic_in_kernel(vcpu
))
867 return kvm_lapic_get_cr8(vcpu
);
869 return vcpu
->arch
.cr8
;
871 EXPORT_SYMBOL_GPL(kvm_get_cr8
);
873 static void kvm_update_dr0123(struct kvm_vcpu
*vcpu
)
877 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
)) {
878 for (i
= 0; i
< KVM_NR_DB_REGS
; i
++)
879 vcpu
->arch
.eff_db
[i
] = vcpu
->arch
.db
[i
];
880 vcpu
->arch
.switch_db_regs
|= KVM_DEBUGREG_RELOAD
;
884 static void kvm_update_dr6(struct kvm_vcpu
*vcpu
)
886 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
))
887 kvm_x86_ops
->set_dr6(vcpu
, vcpu
->arch
.dr6
);
890 static void kvm_update_dr7(struct kvm_vcpu
*vcpu
)
894 if (vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
)
895 dr7
= vcpu
->arch
.guest_debug_dr7
;
897 dr7
= vcpu
->arch
.dr7
;
898 kvm_x86_ops
->set_dr7(vcpu
, dr7
);
899 vcpu
->arch
.switch_db_regs
&= ~KVM_DEBUGREG_BP_ENABLED
;
900 if (dr7
& DR7_BP_EN_MASK
)
901 vcpu
->arch
.switch_db_regs
|= KVM_DEBUGREG_BP_ENABLED
;
904 static u64
kvm_dr6_fixed(struct kvm_vcpu
*vcpu
)
906 u64 fixed
= DR6_FIXED_1
;
908 if (!guest_cpuid_has(vcpu
, X86_FEATURE_RTM
))
913 static int __kvm_set_dr(struct kvm_vcpu
*vcpu
, int dr
, unsigned long val
)
917 vcpu
->arch
.db
[dr
] = val
;
918 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
))
919 vcpu
->arch
.eff_db
[dr
] = val
;
924 if (val
& 0xffffffff00000000ULL
)
926 vcpu
->arch
.dr6
= (val
& DR6_VOLATILE
) | kvm_dr6_fixed(vcpu
);
927 kvm_update_dr6(vcpu
);
932 if (val
& 0xffffffff00000000ULL
)
934 vcpu
->arch
.dr7
= (val
& DR7_VOLATILE
) | DR7_FIXED_1
;
935 kvm_update_dr7(vcpu
);
942 int kvm_set_dr(struct kvm_vcpu
*vcpu
, int dr
, unsigned long val
)
944 if (__kvm_set_dr(vcpu
, dr
, val
)) {
945 kvm_inject_gp(vcpu
, 0);
950 EXPORT_SYMBOL_GPL(kvm_set_dr
);
952 int kvm_get_dr(struct kvm_vcpu
*vcpu
, int dr
, unsigned long *val
)
956 *val
= vcpu
->arch
.db
[dr
];
961 if (vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
)
962 *val
= vcpu
->arch
.dr6
;
964 *val
= kvm_x86_ops
->get_dr6(vcpu
);
969 *val
= vcpu
->arch
.dr7
;
974 EXPORT_SYMBOL_GPL(kvm_get_dr
);
976 bool kvm_rdpmc(struct kvm_vcpu
*vcpu
)
978 u32 ecx
= kvm_register_read(vcpu
, VCPU_REGS_RCX
);
982 err
= kvm_pmu_rdpmc(vcpu
, ecx
, &data
);
985 kvm_register_write(vcpu
, VCPU_REGS_RAX
, (u32
)data
);
986 kvm_register_write(vcpu
, VCPU_REGS_RDX
, data
>> 32);
989 EXPORT_SYMBOL_GPL(kvm_rdpmc
);
992 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
993 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
995 * This list is modified at module load time to reflect the
996 * capabilities of the host cpu. This capabilities test skips MSRs that are
997 * kvm-specific. Those are put in emulated_msrs; filtering of emulated_msrs
998 * may depend on host virtualization features rather than host cpu features.
1001 static u32 msrs_to_save
[] = {
1002 MSR_IA32_SYSENTER_CS
, MSR_IA32_SYSENTER_ESP
, MSR_IA32_SYSENTER_EIP
,
1004 #ifdef CONFIG_X86_64
1005 MSR_CSTAR
, MSR_KERNEL_GS_BASE
, MSR_SYSCALL_MASK
, MSR_LSTAR
,
1007 MSR_IA32_TSC
, MSR_IA32_CR_PAT
, MSR_VM_HSAVE_PA
,
1008 MSR_IA32_FEATURE_CONTROL
, MSR_IA32_BNDCFGS
, MSR_TSC_AUX
,
1011 static unsigned num_msrs_to_save
;
1013 static u32 emulated_msrs
[] = {
1014 MSR_KVM_SYSTEM_TIME
, MSR_KVM_WALL_CLOCK
,
1015 MSR_KVM_SYSTEM_TIME_NEW
, MSR_KVM_WALL_CLOCK_NEW
,
1016 HV_X64_MSR_GUEST_OS_ID
, HV_X64_MSR_HYPERCALL
,
1017 HV_X64_MSR_TIME_REF_COUNT
, HV_X64_MSR_REFERENCE_TSC
,
1018 HV_X64_MSR_TSC_FREQUENCY
, HV_X64_MSR_APIC_FREQUENCY
,
1019 HV_X64_MSR_CRASH_P0
, HV_X64_MSR_CRASH_P1
, HV_X64_MSR_CRASH_P2
,
1020 HV_X64_MSR_CRASH_P3
, HV_X64_MSR_CRASH_P4
, HV_X64_MSR_CRASH_CTL
,
1022 HV_X64_MSR_VP_INDEX
,
1023 HV_X64_MSR_VP_RUNTIME
,
1024 HV_X64_MSR_SCONTROL
,
1025 HV_X64_MSR_STIMER0_CONFIG
,
1026 HV_X64_MSR_APIC_ASSIST_PAGE
, MSR_KVM_ASYNC_PF_EN
, MSR_KVM_STEAL_TIME
,
1029 MSR_IA32_TSC_ADJUST
,
1030 MSR_IA32_TSCDEADLINE
,
1031 MSR_IA32_MISC_ENABLE
,
1032 MSR_IA32_MCG_STATUS
,
1034 MSR_IA32_MCG_EXT_CTL
,
1037 MSR_MISC_FEATURES_ENABLES
,
1040 static unsigned num_emulated_msrs
;
1042 bool kvm_valid_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
1044 if (efer
& efer_reserved_bits
)
1047 if (efer
& EFER_FFXSR
&& !guest_cpuid_has(vcpu
, X86_FEATURE_FXSR_OPT
))
1050 if (efer
& EFER_SVME
&& !guest_cpuid_has(vcpu
, X86_FEATURE_SVM
))
1055 EXPORT_SYMBOL_GPL(kvm_valid_efer
);
1057 static int set_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
1059 u64 old_efer
= vcpu
->arch
.efer
;
1061 if (!kvm_valid_efer(vcpu
, efer
))
1065 && (vcpu
->arch
.efer
& EFER_LME
) != (efer
& EFER_LME
))
1069 efer
|= vcpu
->arch
.efer
& EFER_LMA
;
1071 kvm_x86_ops
->set_efer(vcpu
, efer
);
1073 /* Update reserved bits */
1074 if ((efer
^ old_efer
) & EFER_NX
)
1075 kvm_mmu_reset_context(vcpu
);
1080 void kvm_enable_efer_bits(u64 mask
)
1082 efer_reserved_bits
&= ~mask
;
1084 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits
);
1087 * Writes msr value into into the appropriate "register".
1088 * Returns 0 on success, non-0 otherwise.
1089 * Assumes vcpu_load() was already called.
1091 int kvm_set_msr(struct kvm_vcpu
*vcpu
, struct msr_data
*msr
)
1093 switch (msr
->index
) {
1096 case MSR_KERNEL_GS_BASE
:
1099 if (is_noncanonical_address(msr
->data
, vcpu
))
1102 case MSR_IA32_SYSENTER_EIP
:
1103 case MSR_IA32_SYSENTER_ESP
:
1105 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
1106 * non-canonical address is written on Intel but not on
1107 * AMD (which ignores the top 32-bits, because it does
1108 * not implement 64-bit SYSENTER).
1110 * 64-bit code should hence be able to write a non-canonical
1111 * value on AMD. Making the address canonical ensures that
1112 * vmentry does not fail on Intel after writing a non-canonical
1113 * value, and that something deterministic happens if the guest
1114 * invokes 64-bit SYSENTER.
1116 msr
->data
= get_canonical(msr
->data
, vcpu_virt_addr_bits(vcpu
));
1118 return kvm_x86_ops
->set_msr(vcpu
, msr
);
1120 EXPORT_SYMBOL_GPL(kvm_set_msr
);
1123 * Adapt set_msr() to msr_io()'s calling convention
1125 static int do_get_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1127 struct msr_data msr
;
1131 msr
.host_initiated
= true;
1132 r
= kvm_get_msr(vcpu
, &msr
);
1140 static int do_set_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1142 struct msr_data msr
;
1146 msr
.host_initiated
= true;
1147 return kvm_set_msr(vcpu
, &msr
);
1150 #ifdef CONFIG_X86_64
1151 struct pvclock_gtod_data
{
1154 struct { /* extract of a clocksource struct */
1167 static struct pvclock_gtod_data pvclock_gtod_data
;
1169 static void update_pvclock_gtod(struct timekeeper
*tk
)
1171 struct pvclock_gtod_data
*vdata
= &pvclock_gtod_data
;
1174 boot_ns
= ktime_to_ns(ktime_add(tk
->tkr_mono
.base
, tk
->offs_boot
));
1176 write_seqcount_begin(&vdata
->seq
);
1178 /* copy pvclock gtod data */
1179 vdata
->clock
.vclock_mode
= tk
->tkr_mono
.clock
->archdata
.vclock_mode
;
1180 vdata
->clock
.cycle_last
= tk
->tkr_mono
.cycle_last
;
1181 vdata
->clock
.mask
= tk
->tkr_mono
.mask
;
1182 vdata
->clock
.mult
= tk
->tkr_mono
.mult
;
1183 vdata
->clock
.shift
= tk
->tkr_mono
.shift
;
1185 vdata
->boot_ns
= boot_ns
;
1186 vdata
->nsec_base
= tk
->tkr_mono
.xtime_nsec
;
1188 vdata
->wall_time_sec
= tk
->xtime_sec
;
1190 write_seqcount_end(&vdata
->seq
);
1194 void kvm_set_pending_timer(struct kvm_vcpu
*vcpu
)
1197 * Note: KVM_REQ_PENDING_TIMER is implicitly checked in
1198 * vcpu_enter_guest. This function is only called from
1199 * the physical CPU that is running vcpu.
1201 kvm_make_request(KVM_REQ_PENDING_TIMER
, vcpu
);
1204 static void kvm_write_wall_clock(struct kvm
*kvm
, gpa_t wall_clock
)
1208 struct pvclock_wall_clock wc
;
1209 struct timespec64 boot
;
1214 r
= kvm_read_guest(kvm
, wall_clock
, &version
, sizeof(version
));
1219 ++version
; /* first time write, random junk */
1223 if (kvm_write_guest(kvm
, wall_clock
, &version
, sizeof(version
)))
1227 * The guest calculates current wall clock time by adding
1228 * system time (updated by kvm_guest_time_update below) to the
1229 * wall clock specified here. guest system time equals host
1230 * system time for us, thus we must fill in host boot time here.
1232 getboottime64(&boot
);
1234 if (kvm
->arch
.kvmclock_offset
) {
1235 struct timespec64 ts
= ns_to_timespec64(kvm
->arch
.kvmclock_offset
);
1236 boot
= timespec64_sub(boot
, ts
);
1238 wc
.sec
= (u32
)boot
.tv_sec
; /* overflow in 2106 guest time */
1239 wc
.nsec
= boot
.tv_nsec
;
1240 wc
.version
= version
;
1242 kvm_write_guest(kvm
, wall_clock
, &wc
, sizeof(wc
));
1245 kvm_write_guest(kvm
, wall_clock
, &version
, sizeof(version
));
1248 static uint32_t div_frac(uint32_t dividend
, uint32_t divisor
)
1250 do_shl32_div32(dividend
, divisor
);
1254 static void kvm_get_time_scale(uint64_t scaled_hz
, uint64_t base_hz
,
1255 s8
*pshift
, u32
*pmultiplier
)
1263 scaled64
= scaled_hz
;
1264 while (tps64
> scaled64
*2 || tps64
& 0xffffffff00000000ULL
) {
1269 tps32
= (uint32_t)tps64
;
1270 while (tps32
<= scaled64
|| scaled64
& 0xffffffff00000000ULL
) {
1271 if (scaled64
& 0xffffffff00000000ULL
|| tps32
& 0x80000000)
1279 *pmultiplier
= div_frac(scaled64
, tps32
);
1281 pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n",
1282 __func__
, base_hz
, scaled_hz
, shift
, *pmultiplier
);
1285 #ifdef CONFIG_X86_64
1286 static atomic_t kvm_guest_has_master_clock
= ATOMIC_INIT(0);
1289 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz
);
1290 static unsigned long max_tsc_khz
;
1292 static u32
adjust_tsc_khz(u32 khz
, s32 ppm
)
1294 u64 v
= (u64
)khz
* (1000000 + ppm
);
1299 static int set_tsc_khz(struct kvm_vcpu
*vcpu
, u32 user_tsc_khz
, bool scale
)
1303 /* Guest TSC same frequency as host TSC? */
1305 vcpu
->arch
.tsc_scaling_ratio
= kvm_default_tsc_scaling_ratio
;
1309 /* TSC scaling supported? */
1310 if (!kvm_has_tsc_control
) {
1311 if (user_tsc_khz
> tsc_khz
) {
1312 vcpu
->arch
.tsc_catchup
= 1;
1313 vcpu
->arch
.tsc_always_catchup
= 1;
1316 WARN(1, "user requested TSC rate below hardware speed\n");
1321 /* TSC scaling required - calculate ratio */
1322 ratio
= mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits
,
1323 user_tsc_khz
, tsc_khz
);
1325 if (ratio
== 0 || ratio
>= kvm_max_tsc_scaling_ratio
) {
1326 WARN_ONCE(1, "Invalid TSC scaling ratio - virtual-tsc-khz=%u\n",
1331 vcpu
->arch
.tsc_scaling_ratio
= ratio
;
1335 static int kvm_set_tsc_khz(struct kvm_vcpu
*vcpu
, u32 user_tsc_khz
)
1337 u32 thresh_lo
, thresh_hi
;
1338 int use_scaling
= 0;
1340 /* tsc_khz can be zero if TSC calibration fails */
1341 if (user_tsc_khz
== 0) {
1342 /* set tsc_scaling_ratio to a safe value */
1343 vcpu
->arch
.tsc_scaling_ratio
= kvm_default_tsc_scaling_ratio
;
1347 /* Compute a scale to convert nanoseconds in TSC cycles */
1348 kvm_get_time_scale(user_tsc_khz
* 1000LL, NSEC_PER_SEC
,
1349 &vcpu
->arch
.virtual_tsc_shift
,
1350 &vcpu
->arch
.virtual_tsc_mult
);
1351 vcpu
->arch
.virtual_tsc_khz
= user_tsc_khz
;
1354 * Compute the variation in TSC rate which is acceptable
1355 * within the range of tolerance and decide if the
1356 * rate being applied is within that bounds of the hardware
1357 * rate. If so, no scaling or compensation need be done.
1359 thresh_lo
= adjust_tsc_khz(tsc_khz
, -tsc_tolerance_ppm
);
1360 thresh_hi
= adjust_tsc_khz(tsc_khz
, tsc_tolerance_ppm
);
1361 if (user_tsc_khz
< thresh_lo
|| user_tsc_khz
> thresh_hi
) {
1362 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz
, thresh_lo
, thresh_hi
);
1365 return set_tsc_khz(vcpu
, user_tsc_khz
, use_scaling
);
1368 static u64
compute_guest_tsc(struct kvm_vcpu
*vcpu
, s64 kernel_ns
)
1370 u64 tsc
= pvclock_scale_delta(kernel_ns
-vcpu
->arch
.this_tsc_nsec
,
1371 vcpu
->arch
.virtual_tsc_mult
,
1372 vcpu
->arch
.virtual_tsc_shift
);
1373 tsc
+= vcpu
->arch
.this_tsc_write
;
1377 static void kvm_track_tsc_matching(struct kvm_vcpu
*vcpu
)
1379 #ifdef CONFIG_X86_64
1381 struct kvm_arch
*ka
= &vcpu
->kvm
->arch
;
1382 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1384 vcpus_matched
= (ka
->nr_vcpus_matched_tsc
+ 1 ==
1385 atomic_read(&vcpu
->kvm
->online_vcpus
));
1388 * Once the masterclock is enabled, always perform request in
1389 * order to update it.
1391 * In order to enable masterclock, the host clocksource must be TSC
1392 * and the vcpus need to have matched TSCs. When that happens,
1393 * perform request to enable masterclock.
1395 if (ka
->use_master_clock
||
1396 (gtod
->clock
.vclock_mode
== VCLOCK_TSC
&& vcpus_matched
))
1397 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
1399 trace_kvm_track_tsc(vcpu
->vcpu_id
, ka
->nr_vcpus_matched_tsc
,
1400 atomic_read(&vcpu
->kvm
->online_vcpus
),
1401 ka
->use_master_clock
, gtod
->clock
.vclock_mode
);
1405 static void update_ia32_tsc_adjust_msr(struct kvm_vcpu
*vcpu
, s64 offset
)
1407 u64 curr_offset
= vcpu
->arch
.tsc_offset
;
1408 vcpu
->arch
.ia32_tsc_adjust_msr
+= offset
- curr_offset
;
1412 * Multiply tsc by a fixed point number represented by ratio.
1414 * The most significant 64-N bits (mult) of ratio represent the
1415 * integral part of the fixed point number; the remaining N bits
1416 * (frac) represent the fractional part, ie. ratio represents a fixed
1417 * point number (mult + frac * 2^(-N)).
1419 * N equals to kvm_tsc_scaling_ratio_frac_bits.
1421 static inline u64
__scale_tsc(u64 ratio
, u64 tsc
)
1423 return mul_u64_u64_shr(tsc
, ratio
, kvm_tsc_scaling_ratio_frac_bits
);
1426 u64
kvm_scale_tsc(struct kvm_vcpu
*vcpu
, u64 tsc
)
1429 u64 ratio
= vcpu
->arch
.tsc_scaling_ratio
;
1431 if (ratio
!= kvm_default_tsc_scaling_ratio
)
1432 _tsc
= __scale_tsc(ratio
, tsc
);
1436 EXPORT_SYMBOL_GPL(kvm_scale_tsc
);
1438 static u64
kvm_compute_tsc_offset(struct kvm_vcpu
*vcpu
, u64 target_tsc
)
1442 tsc
= kvm_scale_tsc(vcpu
, rdtsc());
1444 return target_tsc
- tsc
;
1447 u64
kvm_read_l1_tsc(struct kvm_vcpu
*vcpu
, u64 host_tsc
)
1449 return vcpu
->arch
.tsc_offset
+ kvm_scale_tsc(vcpu
, host_tsc
);
1451 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc
);
1453 static void kvm_vcpu_write_tsc_offset(struct kvm_vcpu
*vcpu
, u64 offset
)
1455 kvm_x86_ops
->write_tsc_offset(vcpu
, offset
);
1456 vcpu
->arch
.tsc_offset
= offset
;
1459 void kvm_write_tsc(struct kvm_vcpu
*vcpu
, struct msr_data
*msr
)
1461 struct kvm
*kvm
= vcpu
->kvm
;
1462 u64 offset
, ns
, elapsed
;
1463 unsigned long flags
;
1465 bool already_matched
;
1466 u64 data
= msr
->data
;
1467 bool synchronizing
= false;
1469 raw_spin_lock_irqsave(&kvm
->arch
.tsc_write_lock
, flags
);
1470 offset
= kvm_compute_tsc_offset(vcpu
, data
);
1471 ns
= ktime_get_boot_ns();
1472 elapsed
= ns
- kvm
->arch
.last_tsc_nsec
;
1474 if (vcpu
->arch
.virtual_tsc_khz
) {
1475 if (data
== 0 && msr
->host_initiated
) {
1477 * detection of vcpu initialization -- need to sync
1478 * with other vCPUs. This particularly helps to keep
1479 * kvm_clock stable after CPU hotplug
1481 synchronizing
= true;
1483 u64 tsc_exp
= kvm
->arch
.last_tsc_write
+
1484 nsec_to_cycles(vcpu
, elapsed
);
1485 u64 tsc_hz
= vcpu
->arch
.virtual_tsc_khz
* 1000LL;
1487 * Special case: TSC write with a small delta (1 second)
1488 * of virtual cycle time against real time is
1489 * interpreted as an attempt to synchronize the CPU.
1491 synchronizing
= data
< tsc_exp
+ tsc_hz
&&
1492 data
+ tsc_hz
> tsc_exp
;
1497 * For a reliable TSC, we can match TSC offsets, and for an unstable
1498 * TSC, we add elapsed time in this computation. We could let the
1499 * compensation code attempt to catch up if we fall behind, but
1500 * it's better to try to match offsets from the beginning.
1502 if (synchronizing
&&
1503 vcpu
->arch
.virtual_tsc_khz
== kvm
->arch
.last_tsc_khz
) {
1504 if (!check_tsc_unstable()) {
1505 offset
= kvm
->arch
.cur_tsc_offset
;
1506 pr_debug("kvm: matched tsc offset for %llu\n", data
);
1508 u64 delta
= nsec_to_cycles(vcpu
, elapsed
);
1510 offset
= kvm_compute_tsc_offset(vcpu
, data
);
1511 pr_debug("kvm: adjusted tsc offset by %llu\n", delta
);
1514 already_matched
= (vcpu
->arch
.this_tsc_generation
== kvm
->arch
.cur_tsc_generation
);
1517 * We split periods of matched TSC writes into generations.
1518 * For each generation, we track the original measured
1519 * nanosecond time, offset, and write, so if TSCs are in
1520 * sync, we can match exact offset, and if not, we can match
1521 * exact software computation in compute_guest_tsc()
1523 * These values are tracked in kvm->arch.cur_xxx variables.
1525 kvm
->arch
.cur_tsc_generation
++;
1526 kvm
->arch
.cur_tsc_nsec
= ns
;
1527 kvm
->arch
.cur_tsc_write
= data
;
1528 kvm
->arch
.cur_tsc_offset
= offset
;
1530 pr_debug("kvm: new tsc generation %llu, clock %llu\n",
1531 kvm
->arch
.cur_tsc_generation
, data
);
1535 * We also track th most recent recorded KHZ, write and time to
1536 * allow the matching interval to be extended at each write.
1538 kvm
->arch
.last_tsc_nsec
= ns
;
1539 kvm
->arch
.last_tsc_write
= data
;
1540 kvm
->arch
.last_tsc_khz
= vcpu
->arch
.virtual_tsc_khz
;
1542 vcpu
->arch
.last_guest_tsc
= data
;
1544 /* Keep track of which generation this VCPU has synchronized to */
1545 vcpu
->arch
.this_tsc_generation
= kvm
->arch
.cur_tsc_generation
;
1546 vcpu
->arch
.this_tsc_nsec
= kvm
->arch
.cur_tsc_nsec
;
1547 vcpu
->arch
.this_tsc_write
= kvm
->arch
.cur_tsc_write
;
1549 if (!msr
->host_initiated
&& guest_cpuid_has(vcpu
, X86_FEATURE_TSC_ADJUST
))
1550 update_ia32_tsc_adjust_msr(vcpu
, offset
);
1552 kvm_vcpu_write_tsc_offset(vcpu
, offset
);
1553 raw_spin_unlock_irqrestore(&kvm
->arch
.tsc_write_lock
, flags
);
1555 spin_lock(&kvm
->arch
.pvclock_gtod_sync_lock
);
1557 kvm
->arch
.nr_vcpus_matched_tsc
= 0;
1558 } else if (!already_matched
) {
1559 kvm
->arch
.nr_vcpus_matched_tsc
++;
1562 kvm_track_tsc_matching(vcpu
);
1563 spin_unlock(&kvm
->arch
.pvclock_gtod_sync_lock
);
1566 EXPORT_SYMBOL_GPL(kvm_write_tsc
);
1568 static inline void adjust_tsc_offset_guest(struct kvm_vcpu
*vcpu
,
1571 kvm_vcpu_write_tsc_offset(vcpu
, vcpu
->arch
.tsc_offset
+ adjustment
);
1574 static inline void adjust_tsc_offset_host(struct kvm_vcpu
*vcpu
, s64 adjustment
)
1576 if (vcpu
->arch
.tsc_scaling_ratio
!= kvm_default_tsc_scaling_ratio
)
1577 WARN_ON(adjustment
< 0);
1578 adjustment
= kvm_scale_tsc(vcpu
, (u64
) adjustment
);
1579 adjust_tsc_offset_guest(vcpu
, adjustment
);
1582 #ifdef CONFIG_X86_64
1584 static u64
read_tsc(void)
1586 u64 ret
= (u64
)rdtsc_ordered();
1587 u64 last
= pvclock_gtod_data
.clock
.cycle_last
;
1589 if (likely(ret
>= last
))
1593 * GCC likes to generate cmov here, but this branch is extremely
1594 * predictable (it's just a function of time and the likely is
1595 * very likely) and there's a data dependence, so force GCC
1596 * to generate a branch instead. I don't barrier() because
1597 * we don't actually need a barrier, and if this function
1598 * ever gets inlined it will generate worse code.
1604 static inline u64
vgettsc(u64
*cycle_now
)
1607 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1609 *cycle_now
= read_tsc();
1611 v
= (*cycle_now
- gtod
->clock
.cycle_last
) & gtod
->clock
.mask
;
1612 return v
* gtod
->clock
.mult
;
1615 static int do_monotonic_boot(s64
*t
, u64
*cycle_now
)
1617 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1623 seq
= read_seqcount_begin(>od
->seq
);
1624 mode
= gtod
->clock
.vclock_mode
;
1625 ns
= gtod
->nsec_base
;
1626 ns
+= vgettsc(cycle_now
);
1627 ns
>>= gtod
->clock
.shift
;
1628 ns
+= gtod
->boot_ns
;
1629 } while (unlikely(read_seqcount_retry(>od
->seq
, seq
)));
1635 static int do_realtime(struct timespec
*ts
, u64
*cycle_now
)
1637 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1643 seq
= read_seqcount_begin(>od
->seq
);
1644 mode
= gtod
->clock
.vclock_mode
;
1645 ts
->tv_sec
= gtod
->wall_time_sec
;
1646 ns
= gtod
->nsec_base
;
1647 ns
+= vgettsc(cycle_now
);
1648 ns
>>= gtod
->clock
.shift
;
1649 } while (unlikely(read_seqcount_retry(>od
->seq
, seq
)));
1651 ts
->tv_sec
+= __iter_div_u64_rem(ns
, NSEC_PER_SEC
, &ns
);
1657 /* returns true if host is using tsc clocksource */
1658 static bool kvm_get_time_and_clockread(s64
*kernel_ns
, u64
*cycle_now
)
1660 /* checked again under seqlock below */
1661 if (pvclock_gtod_data
.clock
.vclock_mode
!= VCLOCK_TSC
)
1664 return do_monotonic_boot(kernel_ns
, cycle_now
) == VCLOCK_TSC
;
1667 /* returns true if host is using tsc clocksource */
1668 static bool kvm_get_walltime_and_clockread(struct timespec
*ts
,
1671 /* checked again under seqlock below */
1672 if (pvclock_gtod_data
.clock
.vclock_mode
!= VCLOCK_TSC
)
1675 return do_realtime(ts
, cycle_now
) == VCLOCK_TSC
;
1681 * Assuming a stable TSC across physical CPUS, and a stable TSC
1682 * across virtual CPUs, the following condition is possible.
1683 * Each numbered line represents an event visible to both
1684 * CPUs at the next numbered event.
1686 * "timespecX" represents host monotonic time. "tscX" represents
1689 * VCPU0 on CPU0 | VCPU1 on CPU1
1691 * 1. read timespec0,tsc0
1692 * 2. | timespec1 = timespec0 + N
1694 * 3. transition to guest | transition to guest
1695 * 4. ret0 = timespec0 + (rdtsc - tsc0) |
1696 * 5. | ret1 = timespec1 + (rdtsc - tsc1)
1697 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
1699 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
1702 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
1704 * - 0 < N - M => M < N
1706 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not
1707 * always the case (the difference between two distinct xtime instances
1708 * might be smaller then the difference between corresponding TSC reads,
1709 * when updating guest vcpus pvclock areas).
1711 * To avoid that problem, do not allow visibility of distinct
1712 * system_timestamp/tsc_timestamp values simultaneously: use a master
1713 * copy of host monotonic time values. Update that master copy
1716 * Rely on synchronization of host TSCs and guest TSCs for monotonicity.
1720 static void pvclock_update_vm_gtod_copy(struct kvm
*kvm
)
1722 #ifdef CONFIG_X86_64
1723 struct kvm_arch
*ka
= &kvm
->arch
;
1725 bool host_tsc_clocksource
, vcpus_matched
;
1727 vcpus_matched
= (ka
->nr_vcpus_matched_tsc
+ 1 ==
1728 atomic_read(&kvm
->online_vcpus
));
1731 * If the host uses TSC clock, then passthrough TSC as stable
1734 host_tsc_clocksource
= kvm_get_time_and_clockread(
1735 &ka
->master_kernel_ns
,
1736 &ka
->master_cycle_now
);
1738 ka
->use_master_clock
= host_tsc_clocksource
&& vcpus_matched
1739 && !ka
->backwards_tsc_observed
1740 && !ka
->boot_vcpu_runs_old_kvmclock
;
1742 if (ka
->use_master_clock
)
1743 atomic_set(&kvm_guest_has_master_clock
, 1);
1745 vclock_mode
= pvclock_gtod_data
.clock
.vclock_mode
;
1746 trace_kvm_update_master_clock(ka
->use_master_clock
, vclock_mode
,
1751 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
1753 kvm_make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
1756 static void kvm_gen_update_masterclock(struct kvm
*kvm
)
1758 #ifdef CONFIG_X86_64
1760 struct kvm_vcpu
*vcpu
;
1761 struct kvm_arch
*ka
= &kvm
->arch
;
1763 spin_lock(&ka
->pvclock_gtod_sync_lock
);
1764 kvm_make_mclock_inprogress_request(kvm
);
1765 /* no guest entries from this point */
1766 pvclock_update_vm_gtod_copy(kvm
);
1768 kvm_for_each_vcpu(i
, vcpu
, kvm
)
1769 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
1771 /* guest entries allowed */
1772 kvm_for_each_vcpu(i
, vcpu
, kvm
)
1773 kvm_clear_request(KVM_REQ_MCLOCK_INPROGRESS
, vcpu
);
1775 spin_unlock(&ka
->pvclock_gtod_sync_lock
);
1779 u64
get_kvmclock_ns(struct kvm
*kvm
)
1781 struct kvm_arch
*ka
= &kvm
->arch
;
1782 struct pvclock_vcpu_time_info hv_clock
;
1785 spin_lock(&ka
->pvclock_gtod_sync_lock
);
1786 if (!ka
->use_master_clock
) {
1787 spin_unlock(&ka
->pvclock_gtod_sync_lock
);
1788 return ktime_get_boot_ns() + ka
->kvmclock_offset
;
1791 hv_clock
.tsc_timestamp
= ka
->master_cycle_now
;
1792 hv_clock
.system_time
= ka
->master_kernel_ns
+ ka
->kvmclock_offset
;
1793 spin_unlock(&ka
->pvclock_gtod_sync_lock
);
1795 /* both __this_cpu_read() and rdtsc() should be on the same cpu */
1798 kvm_get_time_scale(NSEC_PER_SEC
, __this_cpu_read(cpu_tsc_khz
) * 1000LL,
1799 &hv_clock
.tsc_shift
,
1800 &hv_clock
.tsc_to_system_mul
);
1801 ret
= __pvclock_read_cycles(&hv_clock
, rdtsc());
1808 static void kvm_setup_pvclock_page(struct kvm_vcpu
*v
)
1810 struct kvm_vcpu_arch
*vcpu
= &v
->arch
;
1811 struct pvclock_vcpu_time_info guest_hv_clock
;
1813 if (unlikely(kvm_read_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1814 &guest_hv_clock
, sizeof(guest_hv_clock
))))
1817 /* This VCPU is paused, but it's legal for a guest to read another
1818 * VCPU's kvmclock, so we really have to follow the specification where
1819 * it says that version is odd if data is being modified, and even after
1822 * Version field updates must be kept separate. This is because
1823 * kvm_write_guest_cached might use a "rep movs" instruction, and
1824 * writes within a string instruction are weakly ordered. So there
1825 * are three writes overall.
1827 * As a small optimization, only write the version field in the first
1828 * and third write. The vcpu->pv_time cache is still valid, because the
1829 * version field is the first in the struct.
1831 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info
, version
) != 0);
1833 vcpu
->hv_clock
.version
= guest_hv_clock
.version
+ 1;
1834 kvm_write_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1836 sizeof(vcpu
->hv_clock
.version
));
1840 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
1841 vcpu
->hv_clock
.flags
|= (guest_hv_clock
.flags
& PVCLOCK_GUEST_STOPPED
);
1843 if (vcpu
->pvclock_set_guest_stopped_request
) {
1844 vcpu
->hv_clock
.flags
|= PVCLOCK_GUEST_STOPPED
;
1845 vcpu
->pvclock_set_guest_stopped_request
= false;
1848 trace_kvm_pvclock_update(v
->vcpu_id
, &vcpu
->hv_clock
);
1850 kvm_write_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1852 sizeof(vcpu
->hv_clock
));
1856 vcpu
->hv_clock
.version
++;
1857 kvm_write_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1859 sizeof(vcpu
->hv_clock
.version
));
1862 static int kvm_guest_time_update(struct kvm_vcpu
*v
)
1864 unsigned long flags
, tgt_tsc_khz
;
1865 struct kvm_vcpu_arch
*vcpu
= &v
->arch
;
1866 struct kvm_arch
*ka
= &v
->kvm
->arch
;
1868 u64 tsc_timestamp
, host_tsc
;
1870 bool use_master_clock
;
1876 * If the host uses TSC clock, then passthrough TSC as stable
1879 spin_lock(&ka
->pvclock_gtod_sync_lock
);
1880 use_master_clock
= ka
->use_master_clock
;
1881 if (use_master_clock
) {
1882 host_tsc
= ka
->master_cycle_now
;
1883 kernel_ns
= ka
->master_kernel_ns
;
1885 spin_unlock(&ka
->pvclock_gtod_sync_lock
);
1887 /* Keep irq disabled to prevent changes to the clock */
1888 local_irq_save(flags
);
1889 tgt_tsc_khz
= __this_cpu_read(cpu_tsc_khz
);
1890 if (unlikely(tgt_tsc_khz
== 0)) {
1891 local_irq_restore(flags
);
1892 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, v
);
1895 if (!use_master_clock
) {
1897 kernel_ns
= ktime_get_boot_ns();
1900 tsc_timestamp
= kvm_read_l1_tsc(v
, host_tsc
);
1903 * We may have to catch up the TSC to match elapsed wall clock
1904 * time for two reasons, even if kvmclock is used.
1905 * 1) CPU could have been running below the maximum TSC rate
1906 * 2) Broken TSC compensation resets the base at each VCPU
1907 * entry to avoid unknown leaps of TSC even when running
1908 * again on the same CPU. This may cause apparent elapsed
1909 * time to disappear, and the guest to stand still or run
1912 if (vcpu
->tsc_catchup
) {
1913 u64 tsc
= compute_guest_tsc(v
, kernel_ns
);
1914 if (tsc
> tsc_timestamp
) {
1915 adjust_tsc_offset_guest(v
, tsc
- tsc_timestamp
);
1916 tsc_timestamp
= tsc
;
1920 local_irq_restore(flags
);
1922 /* With all the info we got, fill in the values */
1924 if (kvm_has_tsc_control
)
1925 tgt_tsc_khz
= kvm_scale_tsc(v
, tgt_tsc_khz
);
1927 if (unlikely(vcpu
->hw_tsc_khz
!= tgt_tsc_khz
)) {
1928 kvm_get_time_scale(NSEC_PER_SEC
, tgt_tsc_khz
* 1000LL,
1929 &vcpu
->hv_clock
.tsc_shift
,
1930 &vcpu
->hv_clock
.tsc_to_system_mul
);
1931 vcpu
->hw_tsc_khz
= tgt_tsc_khz
;
1934 vcpu
->hv_clock
.tsc_timestamp
= tsc_timestamp
;
1935 vcpu
->hv_clock
.system_time
= kernel_ns
+ v
->kvm
->arch
.kvmclock_offset
;
1936 vcpu
->last_guest_tsc
= tsc_timestamp
;
1938 /* If the host uses TSC clocksource, then it is stable */
1940 if (use_master_clock
)
1941 pvclock_flags
|= PVCLOCK_TSC_STABLE_BIT
;
1943 vcpu
->hv_clock
.flags
= pvclock_flags
;
1945 if (vcpu
->pv_time_enabled
)
1946 kvm_setup_pvclock_page(v
);
1947 if (v
== kvm_get_vcpu(v
->kvm
, 0))
1948 kvm_hv_setup_tsc_page(v
->kvm
, &vcpu
->hv_clock
);
1953 * kvmclock updates which are isolated to a given vcpu, such as
1954 * vcpu->cpu migration, should not allow system_timestamp from
1955 * the rest of the vcpus to remain static. Otherwise ntp frequency
1956 * correction applies to one vcpu's system_timestamp but not
1959 * So in those cases, request a kvmclock update for all vcpus.
1960 * We need to rate-limit these requests though, as they can
1961 * considerably slow guests that have a large number of vcpus.
1962 * The time for a remote vcpu to update its kvmclock is bound
1963 * by the delay we use to rate-limit the updates.
1966 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100)
1968 static void kvmclock_update_fn(struct work_struct
*work
)
1971 struct delayed_work
*dwork
= to_delayed_work(work
);
1972 struct kvm_arch
*ka
= container_of(dwork
, struct kvm_arch
,
1973 kvmclock_update_work
);
1974 struct kvm
*kvm
= container_of(ka
, struct kvm
, arch
);
1975 struct kvm_vcpu
*vcpu
;
1977 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1978 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
1979 kvm_vcpu_kick(vcpu
);
1983 static void kvm_gen_kvmclock_update(struct kvm_vcpu
*v
)
1985 struct kvm
*kvm
= v
->kvm
;
1987 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, v
);
1988 schedule_delayed_work(&kvm
->arch
.kvmclock_update_work
,
1989 KVMCLOCK_UPDATE_DELAY
);
1992 #define KVMCLOCK_SYNC_PERIOD (300 * HZ)
1994 static void kvmclock_sync_fn(struct work_struct
*work
)
1996 struct delayed_work
*dwork
= to_delayed_work(work
);
1997 struct kvm_arch
*ka
= container_of(dwork
, struct kvm_arch
,
1998 kvmclock_sync_work
);
1999 struct kvm
*kvm
= container_of(ka
, struct kvm
, arch
);
2001 if (!kvmclock_periodic_sync
)
2004 schedule_delayed_work(&kvm
->arch
.kvmclock_update_work
, 0);
2005 schedule_delayed_work(&kvm
->arch
.kvmclock_sync_work
,
2006 KVMCLOCK_SYNC_PERIOD
);
2009 static int set_msr_mce(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
)
2011 u64 mcg_cap
= vcpu
->arch
.mcg_cap
;
2012 unsigned bank_num
= mcg_cap
& 0xff;
2015 case MSR_IA32_MCG_STATUS
:
2016 vcpu
->arch
.mcg_status
= data
;
2018 case MSR_IA32_MCG_CTL
:
2019 if (!(mcg_cap
& MCG_CTL_P
))
2021 if (data
!= 0 && data
!= ~(u64
)0)
2023 vcpu
->arch
.mcg_ctl
= data
;
2026 if (msr
>= MSR_IA32_MC0_CTL
&&
2027 msr
< MSR_IA32_MCx_CTL(bank_num
)) {
2028 u32 offset
= msr
- MSR_IA32_MC0_CTL
;
2029 /* only 0 or all 1s can be written to IA32_MCi_CTL
2030 * some Linux kernels though clear bit 10 in bank 4 to
2031 * workaround a BIOS/GART TBL issue on AMD K8s, ignore
2032 * this to avoid an uncatched #GP in the guest
2034 if ((offset
& 0x3) == 0 &&
2035 data
!= 0 && (data
| (1 << 10)) != ~(u64
)0)
2037 vcpu
->arch
.mce_banks
[offset
] = data
;
2045 static int xen_hvm_config(struct kvm_vcpu
*vcpu
, u64 data
)
2047 struct kvm
*kvm
= vcpu
->kvm
;
2048 int lm
= is_long_mode(vcpu
);
2049 u8
*blob_addr
= lm
? (u8
*)(long)kvm
->arch
.xen_hvm_config
.blob_addr_64
2050 : (u8
*)(long)kvm
->arch
.xen_hvm_config
.blob_addr_32
;
2051 u8 blob_size
= lm
? kvm
->arch
.xen_hvm_config
.blob_size_64
2052 : kvm
->arch
.xen_hvm_config
.blob_size_32
;
2053 u32 page_num
= data
& ~PAGE_MASK
;
2054 u64 page_addr
= data
& PAGE_MASK
;
2059 if (page_num
>= blob_size
)
2062 page
= memdup_user(blob_addr
+ (page_num
* PAGE_SIZE
), PAGE_SIZE
);
2067 if (kvm_vcpu_write_guest(vcpu
, page_addr
, page
, PAGE_SIZE
))
2076 static int kvm_pv_enable_async_pf(struct kvm_vcpu
*vcpu
, u64 data
)
2078 gpa_t gpa
= data
& ~0x3f;
2080 /* Bits 3:5 are reserved, Should be zero */
2084 vcpu
->arch
.apf
.msr_val
= data
;
2086 if (!(data
& KVM_ASYNC_PF_ENABLED
)) {
2087 kvm_clear_async_pf_completion_queue(vcpu
);
2088 kvm_async_pf_hash_reset(vcpu
);
2092 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
, &vcpu
->arch
.apf
.data
, gpa
,
2096 vcpu
->arch
.apf
.send_user_only
= !(data
& KVM_ASYNC_PF_SEND_ALWAYS
);
2097 vcpu
->arch
.apf
.delivery_as_pf_vmexit
= data
& KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT
;
2098 kvm_async_pf_wakeup_all(vcpu
);
2102 static void kvmclock_reset(struct kvm_vcpu
*vcpu
)
2104 vcpu
->arch
.pv_time_enabled
= false;
2107 static void record_steal_time(struct kvm_vcpu
*vcpu
)
2109 if (!(vcpu
->arch
.st
.msr_val
& KVM_MSR_ENABLED
))
2112 if (unlikely(kvm_read_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2113 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
))))
2116 vcpu
->arch
.st
.steal
.preempted
= 0;
2118 if (vcpu
->arch
.st
.steal
.version
& 1)
2119 vcpu
->arch
.st
.steal
.version
+= 1; /* first time write, random junk */
2121 vcpu
->arch
.st
.steal
.version
+= 1;
2123 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2124 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
));
2128 vcpu
->arch
.st
.steal
.steal
+= current
->sched_info
.run_delay
-
2129 vcpu
->arch
.st
.last_steal
;
2130 vcpu
->arch
.st
.last_steal
= current
->sched_info
.run_delay
;
2132 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2133 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
));
2137 vcpu
->arch
.st
.steal
.version
+= 1;
2139 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2140 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
));
2143 int kvm_set_msr_common(struct kvm_vcpu
*vcpu
, struct msr_data
*msr_info
)
2146 u32 msr
= msr_info
->index
;
2147 u64 data
= msr_info
->data
;
2150 case MSR_AMD64_NB_CFG
:
2151 case MSR_IA32_UCODE_REV
:
2152 case MSR_IA32_UCODE_WRITE
:
2153 case MSR_VM_HSAVE_PA
:
2154 case MSR_AMD64_PATCH_LOADER
:
2155 case MSR_AMD64_BU_CFG2
:
2156 case MSR_AMD64_DC_CFG
:
2160 return set_efer(vcpu
, data
);
2162 data
&= ~(u64
)0x40; /* ignore flush filter disable */
2163 data
&= ~(u64
)0x100; /* ignore ignne emulation enable */
2164 data
&= ~(u64
)0x8; /* ignore TLB cache disable */
2165 data
&= ~(u64
)0x40000; /* ignore Mc status write enable */
2167 vcpu_unimpl(vcpu
, "unimplemented HWCR wrmsr: 0x%llx\n",
2172 case MSR_FAM10H_MMIO_CONF_BASE
:
2174 vcpu_unimpl(vcpu
, "unimplemented MMIO_CONF_BASE wrmsr: "
2179 case MSR_IA32_DEBUGCTLMSR
:
2181 /* We support the non-activated case already */
2183 } else if (data
& ~(DEBUGCTLMSR_LBR
| DEBUGCTLMSR_BTF
)) {
2184 /* Values other than LBR and BTF are vendor-specific,
2185 thus reserved and should throw a #GP */
2188 vcpu_unimpl(vcpu
, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
2191 case 0x200 ... 0x2ff:
2192 return kvm_mtrr_set_msr(vcpu
, msr
, data
);
2193 case MSR_IA32_APICBASE
:
2194 return kvm_set_apic_base(vcpu
, msr_info
);
2195 case APIC_BASE_MSR
... APIC_BASE_MSR
+ 0x3ff:
2196 return kvm_x2apic_msr_write(vcpu
, msr
, data
);
2197 case MSR_IA32_TSCDEADLINE
:
2198 kvm_set_lapic_tscdeadline_msr(vcpu
, data
);
2200 case MSR_IA32_TSC_ADJUST
:
2201 if (guest_cpuid_has(vcpu
, X86_FEATURE_TSC_ADJUST
)) {
2202 if (!msr_info
->host_initiated
) {
2203 s64 adj
= data
- vcpu
->arch
.ia32_tsc_adjust_msr
;
2204 adjust_tsc_offset_guest(vcpu
, adj
);
2206 vcpu
->arch
.ia32_tsc_adjust_msr
= data
;
2209 case MSR_IA32_MISC_ENABLE
:
2210 vcpu
->arch
.ia32_misc_enable_msr
= data
;
2212 case MSR_IA32_SMBASE
:
2213 if (!msr_info
->host_initiated
)
2215 vcpu
->arch
.smbase
= data
;
2217 case MSR_KVM_WALL_CLOCK_NEW
:
2218 case MSR_KVM_WALL_CLOCK
:
2219 vcpu
->kvm
->arch
.wall_clock
= data
;
2220 kvm_write_wall_clock(vcpu
->kvm
, data
);
2222 case MSR_KVM_SYSTEM_TIME_NEW
:
2223 case MSR_KVM_SYSTEM_TIME
: {
2224 struct kvm_arch
*ka
= &vcpu
->kvm
->arch
;
2226 kvmclock_reset(vcpu
);
2228 if (vcpu
->vcpu_id
== 0 && !msr_info
->host_initiated
) {
2229 bool tmp
= (msr
== MSR_KVM_SYSTEM_TIME
);
2231 if (ka
->boot_vcpu_runs_old_kvmclock
!= tmp
)
2232 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
2234 ka
->boot_vcpu_runs_old_kvmclock
= tmp
;
2237 vcpu
->arch
.time
= data
;
2238 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE
, vcpu
);
2240 /* we verify if the enable bit is set... */
2244 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
,
2245 &vcpu
->arch
.pv_time
, data
& ~1ULL,
2246 sizeof(struct pvclock_vcpu_time_info
)))
2247 vcpu
->arch
.pv_time_enabled
= false;
2249 vcpu
->arch
.pv_time_enabled
= true;
2253 case MSR_KVM_ASYNC_PF_EN
:
2254 if (kvm_pv_enable_async_pf(vcpu
, data
))
2257 case MSR_KVM_STEAL_TIME
:
2259 if (unlikely(!sched_info_on()))
2262 if (data
& KVM_STEAL_RESERVED_MASK
)
2265 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2266 data
& KVM_STEAL_VALID_BITS
,
2267 sizeof(struct kvm_steal_time
)))
2270 vcpu
->arch
.st
.msr_val
= data
;
2272 if (!(data
& KVM_MSR_ENABLED
))
2275 kvm_make_request(KVM_REQ_STEAL_UPDATE
, vcpu
);
2278 case MSR_KVM_PV_EOI_EN
:
2279 if (kvm_lapic_enable_pv_eoi(vcpu
, data
))
2283 case MSR_IA32_MCG_CTL
:
2284 case MSR_IA32_MCG_STATUS
:
2285 case MSR_IA32_MC0_CTL
... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS
) - 1:
2286 return set_msr_mce(vcpu
, msr
, data
);
2288 case MSR_K7_PERFCTR0
... MSR_K7_PERFCTR3
:
2289 case MSR_P6_PERFCTR0
... MSR_P6_PERFCTR1
:
2290 pr
= true; /* fall through */
2291 case MSR_K7_EVNTSEL0
... MSR_K7_EVNTSEL3
:
2292 case MSR_P6_EVNTSEL0
... MSR_P6_EVNTSEL1
:
2293 if (kvm_pmu_is_valid_msr(vcpu
, msr
))
2294 return kvm_pmu_set_msr(vcpu
, msr_info
);
2296 if (pr
|| data
!= 0)
2297 vcpu_unimpl(vcpu
, "disabled perfctr wrmsr: "
2298 "0x%x data 0x%llx\n", msr
, data
);
2300 case MSR_K7_CLK_CTL
:
2302 * Ignore all writes to this no longer documented MSR.
2303 * Writes are only relevant for old K7 processors,
2304 * all pre-dating SVM, but a recommended workaround from
2305 * AMD for these chips. It is possible to specify the
2306 * affected processor models on the command line, hence
2307 * the need to ignore the workaround.
2310 case HV_X64_MSR_GUEST_OS_ID
... HV_X64_MSR_SINT15
:
2311 case HV_X64_MSR_CRASH_P0
... HV_X64_MSR_CRASH_P4
:
2312 case HV_X64_MSR_CRASH_CTL
:
2313 case HV_X64_MSR_STIMER0_CONFIG
... HV_X64_MSR_STIMER3_COUNT
:
2314 return kvm_hv_set_msr_common(vcpu
, msr
, data
,
2315 msr_info
->host_initiated
);
2316 case MSR_IA32_BBL_CR_CTL3
:
2317 /* Drop writes to this legacy MSR -- see rdmsr
2318 * counterpart for further detail.
2320 vcpu_unimpl(vcpu
, "ignored wrmsr: 0x%x data 0x%llx\n", msr
, data
);
2322 case MSR_AMD64_OSVW_ID_LENGTH
:
2323 if (!guest_cpuid_has(vcpu
, X86_FEATURE_OSVW
))
2325 vcpu
->arch
.osvw
.length
= data
;
2327 case MSR_AMD64_OSVW_STATUS
:
2328 if (!guest_cpuid_has(vcpu
, X86_FEATURE_OSVW
))
2330 vcpu
->arch
.osvw
.status
= data
;
2332 case MSR_PLATFORM_INFO
:
2333 if (!msr_info
->host_initiated
||
2334 data
& ~MSR_PLATFORM_INFO_CPUID_FAULT
||
2335 (!(data
& MSR_PLATFORM_INFO_CPUID_FAULT
) &&
2336 cpuid_fault_enabled(vcpu
)))
2338 vcpu
->arch
.msr_platform_info
= data
;
2340 case MSR_MISC_FEATURES_ENABLES
:
2341 if (data
& ~MSR_MISC_FEATURES_ENABLES_CPUID_FAULT
||
2342 (data
& MSR_MISC_FEATURES_ENABLES_CPUID_FAULT
&&
2343 !supports_cpuid_fault(vcpu
)))
2345 vcpu
->arch
.msr_misc_features_enables
= data
;
2348 if (msr
&& (msr
== vcpu
->kvm
->arch
.xen_hvm_config
.msr
))
2349 return xen_hvm_config(vcpu
, data
);
2350 if (kvm_pmu_is_valid_msr(vcpu
, msr
))
2351 return kvm_pmu_set_msr(vcpu
, msr_info
);
2353 vcpu_debug_ratelimited(vcpu
, "unhandled wrmsr: 0x%x data 0x%llx\n",
2357 vcpu_unimpl(vcpu
, "ignored wrmsr: 0x%x data 0x%llx\n",
2364 EXPORT_SYMBOL_GPL(kvm_set_msr_common
);
2368 * Reads an msr value (of 'msr_index') into 'pdata'.
2369 * Returns 0 on success, non-0 otherwise.
2370 * Assumes vcpu_load() was already called.
2372 int kvm_get_msr(struct kvm_vcpu
*vcpu
, struct msr_data
*msr
)
2374 return kvm_x86_ops
->get_msr(vcpu
, msr
);
2376 EXPORT_SYMBOL_GPL(kvm_get_msr
);
2378 static int get_msr_mce(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*pdata
)
2381 u64 mcg_cap
= vcpu
->arch
.mcg_cap
;
2382 unsigned bank_num
= mcg_cap
& 0xff;
2385 case MSR_IA32_P5_MC_ADDR
:
2386 case MSR_IA32_P5_MC_TYPE
:
2389 case MSR_IA32_MCG_CAP
:
2390 data
= vcpu
->arch
.mcg_cap
;
2392 case MSR_IA32_MCG_CTL
:
2393 if (!(mcg_cap
& MCG_CTL_P
))
2395 data
= vcpu
->arch
.mcg_ctl
;
2397 case MSR_IA32_MCG_STATUS
:
2398 data
= vcpu
->arch
.mcg_status
;
2401 if (msr
>= MSR_IA32_MC0_CTL
&&
2402 msr
< MSR_IA32_MCx_CTL(bank_num
)) {
2403 u32 offset
= msr
- MSR_IA32_MC0_CTL
;
2404 data
= vcpu
->arch
.mce_banks
[offset
];
2413 int kvm_get_msr_common(struct kvm_vcpu
*vcpu
, struct msr_data
*msr_info
)
2415 switch (msr_info
->index
) {
2416 case MSR_IA32_PLATFORM_ID
:
2417 case MSR_IA32_EBL_CR_POWERON
:
2418 case MSR_IA32_DEBUGCTLMSR
:
2419 case MSR_IA32_LASTBRANCHFROMIP
:
2420 case MSR_IA32_LASTBRANCHTOIP
:
2421 case MSR_IA32_LASTINTFROMIP
:
2422 case MSR_IA32_LASTINTTOIP
:
2424 case MSR_K8_TSEG_ADDR
:
2425 case MSR_K8_TSEG_MASK
:
2427 case MSR_VM_HSAVE_PA
:
2428 case MSR_K8_INT_PENDING_MSG
:
2429 case MSR_AMD64_NB_CFG
:
2430 case MSR_FAM10H_MMIO_CONF_BASE
:
2431 case MSR_AMD64_BU_CFG2
:
2432 case MSR_IA32_PERF_CTL
:
2433 case MSR_AMD64_DC_CFG
:
2436 case MSR_K7_EVNTSEL0
... MSR_K7_EVNTSEL3
:
2437 case MSR_K7_PERFCTR0
... MSR_K7_PERFCTR3
:
2438 case MSR_P6_PERFCTR0
... MSR_P6_PERFCTR1
:
2439 case MSR_P6_EVNTSEL0
... MSR_P6_EVNTSEL1
:
2440 if (kvm_pmu_is_valid_msr(vcpu
, msr_info
->index
))
2441 return kvm_pmu_get_msr(vcpu
, msr_info
->index
, &msr_info
->data
);
2444 case MSR_IA32_UCODE_REV
:
2445 msr_info
->data
= 0x100000000ULL
;
2448 case 0x200 ... 0x2ff:
2449 return kvm_mtrr_get_msr(vcpu
, msr_info
->index
, &msr_info
->data
);
2450 case 0xcd: /* fsb frequency */
2454 * MSR_EBC_FREQUENCY_ID
2455 * Conservative value valid for even the basic CPU models.
2456 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
2457 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
2458 * and 266MHz for model 3, or 4. Set Core Clock
2459 * Frequency to System Bus Frequency Ratio to 1 (bits
2460 * 31:24) even though these are only valid for CPU
2461 * models > 2, however guests may end up dividing or
2462 * multiplying by zero otherwise.
2464 case MSR_EBC_FREQUENCY_ID
:
2465 msr_info
->data
= 1 << 24;
2467 case MSR_IA32_APICBASE
:
2468 msr_info
->data
= kvm_get_apic_base(vcpu
);
2470 case APIC_BASE_MSR
... APIC_BASE_MSR
+ 0x3ff:
2471 return kvm_x2apic_msr_read(vcpu
, msr_info
->index
, &msr_info
->data
);
2473 case MSR_IA32_TSCDEADLINE
:
2474 msr_info
->data
= kvm_get_lapic_tscdeadline_msr(vcpu
);
2476 case MSR_IA32_TSC_ADJUST
:
2477 msr_info
->data
= (u64
)vcpu
->arch
.ia32_tsc_adjust_msr
;
2479 case MSR_IA32_MISC_ENABLE
:
2480 msr_info
->data
= vcpu
->arch
.ia32_misc_enable_msr
;
2482 case MSR_IA32_SMBASE
:
2483 if (!msr_info
->host_initiated
)
2485 msr_info
->data
= vcpu
->arch
.smbase
;
2487 case MSR_IA32_PERF_STATUS
:
2488 /* TSC increment by tick */
2489 msr_info
->data
= 1000ULL;
2490 /* CPU multiplier */
2491 msr_info
->data
|= (((uint64_t)4ULL) << 40);
2494 msr_info
->data
= vcpu
->arch
.efer
;
2496 case MSR_KVM_WALL_CLOCK
:
2497 case MSR_KVM_WALL_CLOCK_NEW
:
2498 msr_info
->data
= vcpu
->kvm
->arch
.wall_clock
;
2500 case MSR_KVM_SYSTEM_TIME
:
2501 case MSR_KVM_SYSTEM_TIME_NEW
:
2502 msr_info
->data
= vcpu
->arch
.time
;
2504 case MSR_KVM_ASYNC_PF_EN
:
2505 msr_info
->data
= vcpu
->arch
.apf
.msr_val
;
2507 case MSR_KVM_STEAL_TIME
:
2508 msr_info
->data
= vcpu
->arch
.st
.msr_val
;
2510 case MSR_KVM_PV_EOI_EN
:
2511 msr_info
->data
= vcpu
->arch
.pv_eoi
.msr_val
;
2513 case MSR_IA32_P5_MC_ADDR
:
2514 case MSR_IA32_P5_MC_TYPE
:
2515 case MSR_IA32_MCG_CAP
:
2516 case MSR_IA32_MCG_CTL
:
2517 case MSR_IA32_MCG_STATUS
:
2518 case MSR_IA32_MC0_CTL
... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS
) - 1:
2519 return get_msr_mce(vcpu
, msr_info
->index
, &msr_info
->data
);
2520 case MSR_K7_CLK_CTL
:
2522 * Provide expected ramp-up count for K7. All other
2523 * are set to zero, indicating minimum divisors for
2526 * This prevents guest kernels on AMD host with CPU
2527 * type 6, model 8 and higher from exploding due to
2528 * the rdmsr failing.
2530 msr_info
->data
= 0x20000000;
2532 case HV_X64_MSR_GUEST_OS_ID
... HV_X64_MSR_SINT15
:
2533 case HV_X64_MSR_CRASH_P0
... HV_X64_MSR_CRASH_P4
:
2534 case HV_X64_MSR_CRASH_CTL
:
2535 case HV_X64_MSR_STIMER0_CONFIG
... HV_X64_MSR_STIMER3_COUNT
:
2536 return kvm_hv_get_msr_common(vcpu
,
2537 msr_info
->index
, &msr_info
->data
);
2539 case MSR_IA32_BBL_CR_CTL3
:
2540 /* This legacy MSR exists but isn't fully documented in current
2541 * silicon. It is however accessed by winxp in very narrow
2542 * scenarios where it sets bit #19, itself documented as
2543 * a "reserved" bit. Best effort attempt to source coherent
2544 * read data here should the balance of the register be
2545 * interpreted by the guest:
2547 * L2 cache control register 3: 64GB range, 256KB size,
2548 * enabled, latency 0x1, configured
2550 msr_info
->data
= 0xbe702111;
2552 case MSR_AMD64_OSVW_ID_LENGTH
:
2553 if (!guest_cpuid_has(vcpu
, X86_FEATURE_OSVW
))
2555 msr_info
->data
= vcpu
->arch
.osvw
.length
;
2557 case MSR_AMD64_OSVW_STATUS
:
2558 if (!guest_cpuid_has(vcpu
, X86_FEATURE_OSVW
))
2560 msr_info
->data
= vcpu
->arch
.osvw
.status
;
2562 case MSR_PLATFORM_INFO
:
2563 msr_info
->data
= vcpu
->arch
.msr_platform_info
;
2565 case MSR_MISC_FEATURES_ENABLES
:
2566 msr_info
->data
= vcpu
->arch
.msr_misc_features_enables
;
2569 if (kvm_pmu_is_valid_msr(vcpu
, msr_info
->index
))
2570 return kvm_pmu_get_msr(vcpu
, msr_info
->index
, &msr_info
->data
);
2572 vcpu_debug_ratelimited(vcpu
, "unhandled rdmsr: 0x%x\n",
2576 vcpu_unimpl(vcpu
, "ignored rdmsr: 0x%x\n", msr_info
->index
);
2583 EXPORT_SYMBOL_GPL(kvm_get_msr_common
);
2586 * Read or write a bunch of msrs. All parameters are kernel addresses.
2588 * @return number of msrs set successfully.
2590 static int __msr_io(struct kvm_vcpu
*vcpu
, struct kvm_msrs
*msrs
,
2591 struct kvm_msr_entry
*entries
,
2592 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
2593 unsigned index
, u64
*data
))
2597 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2598 for (i
= 0; i
< msrs
->nmsrs
; ++i
)
2599 if (do_msr(vcpu
, entries
[i
].index
, &entries
[i
].data
))
2601 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2607 * Read or write a bunch of msrs. Parameters are user addresses.
2609 * @return number of msrs set successfully.
2611 static int msr_io(struct kvm_vcpu
*vcpu
, struct kvm_msrs __user
*user_msrs
,
2612 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
2613 unsigned index
, u64
*data
),
2616 struct kvm_msrs msrs
;
2617 struct kvm_msr_entry
*entries
;
2622 if (copy_from_user(&msrs
, user_msrs
, sizeof msrs
))
2626 if (msrs
.nmsrs
>= MAX_IO_MSRS
)
2629 size
= sizeof(struct kvm_msr_entry
) * msrs
.nmsrs
;
2630 entries
= memdup_user(user_msrs
->entries
, size
);
2631 if (IS_ERR(entries
)) {
2632 r
= PTR_ERR(entries
);
2636 r
= n
= __msr_io(vcpu
, &msrs
, entries
, do_msr
);
2641 if (writeback
&& copy_to_user(user_msrs
->entries
, entries
, size
))
2652 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
2657 case KVM_CAP_IRQCHIP
:
2659 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL
:
2660 case KVM_CAP_SET_TSS_ADDR
:
2661 case KVM_CAP_EXT_CPUID
:
2662 case KVM_CAP_EXT_EMUL_CPUID
:
2663 case KVM_CAP_CLOCKSOURCE
:
2665 case KVM_CAP_NOP_IO_DELAY
:
2666 case KVM_CAP_MP_STATE
:
2667 case KVM_CAP_SYNC_MMU
:
2668 case KVM_CAP_USER_NMI
:
2669 case KVM_CAP_REINJECT_CONTROL
:
2670 case KVM_CAP_IRQ_INJECT_STATUS
:
2671 case KVM_CAP_IOEVENTFD
:
2672 case KVM_CAP_IOEVENTFD_NO_LENGTH
:
2674 case KVM_CAP_PIT_STATE2
:
2675 case KVM_CAP_SET_IDENTITY_MAP_ADDR
:
2676 case KVM_CAP_XEN_HVM
:
2677 case KVM_CAP_VCPU_EVENTS
:
2678 case KVM_CAP_HYPERV
:
2679 case KVM_CAP_HYPERV_VAPIC
:
2680 case KVM_CAP_HYPERV_SPIN
:
2681 case KVM_CAP_HYPERV_SYNIC
:
2682 case KVM_CAP_HYPERV_SYNIC2
:
2683 case KVM_CAP_HYPERV_VP_INDEX
:
2684 case KVM_CAP_PCI_SEGMENT
:
2685 case KVM_CAP_DEBUGREGS
:
2686 case KVM_CAP_X86_ROBUST_SINGLESTEP
:
2688 case KVM_CAP_ASYNC_PF
:
2689 case KVM_CAP_GET_TSC_KHZ
:
2690 case KVM_CAP_KVMCLOCK_CTRL
:
2691 case KVM_CAP_READONLY_MEM
:
2692 case KVM_CAP_HYPERV_TIME
:
2693 case KVM_CAP_IOAPIC_POLARITY_IGNORED
:
2694 case KVM_CAP_TSC_DEADLINE_TIMER
:
2695 case KVM_CAP_ENABLE_CAP_VM
:
2696 case KVM_CAP_DISABLE_QUIRKS
:
2697 case KVM_CAP_SET_BOOT_CPU_ID
:
2698 case KVM_CAP_SPLIT_IRQCHIP
:
2699 case KVM_CAP_IMMEDIATE_EXIT
:
2702 case KVM_CAP_ADJUST_CLOCK
:
2703 r
= KVM_CLOCK_TSC_STABLE
;
2705 case KVM_CAP_X86_GUEST_MWAIT
:
2706 r
= kvm_mwait_in_guest();
2708 case KVM_CAP_X86_SMM
:
2709 /* SMBASE is usually relocated above 1M on modern chipsets,
2710 * and SMM handlers might indeed rely on 4G segment limits,
2711 * so do not report SMM to be available if real mode is
2712 * emulated via vm86 mode. Still, do not go to great lengths
2713 * to avoid userspace's usage of the feature, because it is a
2714 * fringe case that is not enabled except via specific settings
2715 * of the module parameters.
2717 r
= kvm_x86_ops
->cpu_has_high_real_mode_segbase();
2720 r
= !kvm_x86_ops
->cpu_has_accelerated_tpr();
2722 case KVM_CAP_NR_VCPUS
:
2723 r
= KVM_SOFT_MAX_VCPUS
;
2725 case KVM_CAP_MAX_VCPUS
:
2728 case KVM_CAP_NR_MEMSLOTS
:
2729 r
= KVM_USER_MEM_SLOTS
;
2731 case KVM_CAP_PV_MMU
: /* obsolete */
2735 r
= KVM_MAX_MCE_BANKS
;
2738 r
= boot_cpu_has(X86_FEATURE_XSAVE
);
2740 case KVM_CAP_TSC_CONTROL
:
2741 r
= kvm_has_tsc_control
;
2743 case KVM_CAP_X2APIC_API
:
2744 r
= KVM_X2APIC_API_VALID_FLAGS
;
2754 long kvm_arch_dev_ioctl(struct file
*filp
,
2755 unsigned int ioctl
, unsigned long arg
)
2757 void __user
*argp
= (void __user
*)arg
;
2761 case KVM_GET_MSR_INDEX_LIST
: {
2762 struct kvm_msr_list __user
*user_msr_list
= argp
;
2763 struct kvm_msr_list msr_list
;
2767 if (copy_from_user(&msr_list
, user_msr_list
, sizeof msr_list
))
2770 msr_list
.nmsrs
= num_msrs_to_save
+ num_emulated_msrs
;
2771 if (copy_to_user(user_msr_list
, &msr_list
, sizeof msr_list
))
2774 if (n
< msr_list
.nmsrs
)
2777 if (copy_to_user(user_msr_list
->indices
, &msrs_to_save
,
2778 num_msrs_to_save
* sizeof(u32
)))
2780 if (copy_to_user(user_msr_list
->indices
+ num_msrs_to_save
,
2782 num_emulated_msrs
* sizeof(u32
)))
2787 case KVM_GET_SUPPORTED_CPUID
:
2788 case KVM_GET_EMULATED_CPUID
: {
2789 struct kvm_cpuid2 __user
*cpuid_arg
= argp
;
2790 struct kvm_cpuid2 cpuid
;
2793 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
2796 r
= kvm_dev_ioctl_get_cpuid(&cpuid
, cpuid_arg
->entries
,
2802 if (copy_to_user(cpuid_arg
, &cpuid
, sizeof cpuid
))
2807 case KVM_X86_GET_MCE_CAP_SUPPORTED
: {
2809 if (copy_to_user(argp
, &kvm_mce_cap_supported
,
2810 sizeof(kvm_mce_cap_supported
)))
2822 static void wbinvd_ipi(void *garbage
)
2827 static bool need_emulate_wbinvd(struct kvm_vcpu
*vcpu
)
2829 return kvm_arch_has_noncoherent_dma(vcpu
->kvm
);
2832 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
2834 /* Address WBINVD may be executed by guest */
2835 if (need_emulate_wbinvd(vcpu
)) {
2836 if (kvm_x86_ops
->has_wbinvd_exit())
2837 cpumask_set_cpu(cpu
, vcpu
->arch
.wbinvd_dirty_mask
);
2838 else if (vcpu
->cpu
!= -1 && vcpu
->cpu
!= cpu
)
2839 smp_call_function_single(vcpu
->cpu
,
2840 wbinvd_ipi
, NULL
, 1);
2843 kvm_x86_ops
->vcpu_load(vcpu
, cpu
);
2845 /* Apply any externally detected TSC adjustments (due to suspend) */
2846 if (unlikely(vcpu
->arch
.tsc_offset_adjustment
)) {
2847 adjust_tsc_offset_host(vcpu
, vcpu
->arch
.tsc_offset_adjustment
);
2848 vcpu
->arch
.tsc_offset_adjustment
= 0;
2849 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
2852 if (unlikely(vcpu
->cpu
!= cpu
) || check_tsc_unstable()) {
2853 s64 tsc_delta
= !vcpu
->arch
.last_host_tsc
? 0 :
2854 rdtsc() - vcpu
->arch
.last_host_tsc
;
2856 mark_tsc_unstable("KVM discovered backwards TSC");
2858 if (check_tsc_unstable()) {
2859 u64 offset
= kvm_compute_tsc_offset(vcpu
,
2860 vcpu
->arch
.last_guest_tsc
);
2861 kvm_vcpu_write_tsc_offset(vcpu
, offset
);
2862 vcpu
->arch
.tsc_catchup
= 1;
2865 if (kvm_lapic_hv_timer_in_use(vcpu
))
2866 kvm_lapic_restart_hv_timer(vcpu
);
2869 * On a host with synchronized TSC, there is no need to update
2870 * kvmclock on vcpu->cpu migration
2872 if (!vcpu
->kvm
->arch
.use_master_clock
|| vcpu
->cpu
== -1)
2873 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE
, vcpu
);
2874 if (vcpu
->cpu
!= cpu
)
2875 kvm_make_request(KVM_REQ_MIGRATE_TIMER
, vcpu
);
2879 kvm_make_request(KVM_REQ_STEAL_UPDATE
, vcpu
);
2882 static void kvm_steal_time_set_preempted(struct kvm_vcpu
*vcpu
)
2884 if (!(vcpu
->arch
.st
.msr_val
& KVM_MSR_ENABLED
))
2887 vcpu
->arch
.st
.steal
.preempted
= 1;
2889 kvm_write_guest_offset_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2890 &vcpu
->arch
.st
.steal
.preempted
,
2891 offsetof(struct kvm_steal_time
, preempted
),
2892 sizeof(vcpu
->arch
.st
.steal
.preempted
));
2895 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
2899 if (vcpu
->preempted
)
2900 vcpu
->arch
.preempted_in_kernel
= !kvm_x86_ops
->get_cpl(vcpu
);
2903 * Disable page faults because we're in atomic context here.
2904 * kvm_write_guest_offset_cached() would call might_fault()
2905 * that relies on pagefault_disable() to tell if there's a
2906 * bug. NOTE: the write to guest memory may not go through if
2907 * during postcopy live migration or if there's heavy guest
2910 pagefault_disable();
2912 * kvm_memslots() will be called by
2913 * kvm_write_guest_offset_cached() so take the srcu lock.
2915 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2916 kvm_steal_time_set_preempted(vcpu
);
2917 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2919 kvm_x86_ops
->vcpu_put(vcpu
);
2920 kvm_put_guest_fpu(vcpu
);
2921 vcpu
->arch
.last_host_tsc
= rdtsc();
2924 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu
*vcpu
,
2925 struct kvm_lapic_state
*s
)
2927 if (kvm_x86_ops
->sync_pir_to_irr
&& vcpu
->arch
.apicv_active
)
2928 kvm_x86_ops
->sync_pir_to_irr(vcpu
);
2930 return kvm_apic_get_state(vcpu
, s
);
2933 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu
*vcpu
,
2934 struct kvm_lapic_state
*s
)
2938 r
= kvm_apic_set_state(vcpu
, s
);
2941 update_cr8_intercept(vcpu
);
2946 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu
*vcpu
)
2948 return (!lapic_in_kernel(vcpu
) ||
2949 kvm_apic_accept_pic_intr(vcpu
));
2953 * if userspace requested an interrupt window, check that the
2954 * interrupt window is open.
2956 * No need to exit to userspace if we already have an interrupt queued.
2958 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu
*vcpu
)
2960 return kvm_arch_interrupt_allowed(vcpu
) &&
2961 !kvm_cpu_has_interrupt(vcpu
) &&
2962 !kvm_event_needs_reinjection(vcpu
) &&
2963 kvm_cpu_accept_dm_intr(vcpu
);
2966 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu
*vcpu
,
2967 struct kvm_interrupt
*irq
)
2969 if (irq
->irq
>= KVM_NR_INTERRUPTS
)
2972 if (!irqchip_in_kernel(vcpu
->kvm
)) {
2973 kvm_queue_interrupt(vcpu
, irq
->irq
, false);
2974 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
2979 * With in-kernel LAPIC, we only use this to inject EXTINT, so
2980 * fail for in-kernel 8259.
2982 if (pic_in_kernel(vcpu
->kvm
))
2985 if (vcpu
->arch
.pending_external_vector
!= -1)
2988 vcpu
->arch
.pending_external_vector
= irq
->irq
;
2989 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
2993 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu
*vcpu
)
2995 kvm_inject_nmi(vcpu
);
3000 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu
*vcpu
)
3002 kvm_make_request(KVM_REQ_SMI
, vcpu
);
3007 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu
*vcpu
,
3008 struct kvm_tpr_access_ctl
*tac
)
3012 vcpu
->arch
.tpr_access_reporting
= !!tac
->enabled
;
3016 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu
*vcpu
,
3020 unsigned bank_num
= mcg_cap
& 0xff, bank
;
3023 if (!bank_num
|| bank_num
>= KVM_MAX_MCE_BANKS
)
3025 if (mcg_cap
& ~(kvm_mce_cap_supported
| 0xff | 0xff0000))
3028 vcpu
->arch
.mcg_cap
= mcg_cap
;
3029 /* Init IA32_MCG_CTL to all 1s */
3030 if (mcg_cap
& MCG_CTL_P
)
3031 vcpu
->arch
.mcg_ctl
= ~(u64
)0;
3032 /* Init IA32_MCi_CTL to all 1s */
3033 for (bank
= 0; bank
< bank_num
; bank
++)
3034 vcpu
->arch
.mce_banks
[bank
*4] = ~(u64
)0;
3036 if (kvm_x86_ops
->setup_mce
)
3037 kvm_x86_ops
->setup_mce(vcpu
);
3042 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu
*vcpu
,
3043 struct kvm_x86_mce
*mce
)
3045 u64 mcg_cap
= vcpu
->arch
.mcg_cap
;
3046 unsigned bank_num
= mcg_cap
& 0xff;
3047 u64
*banks
= vcpu
->arch
.mce_banks
;
3049 if (mce
->bank
>= bank_num
|| !(mce
->status
& MCI_STATUS_VAL
))
3052 * if IA32_MCG_CTL is not all 1s, the uncorrected error
3053 * reporting is disabled
3055 if ((mce
->status
& MCI_STATUS_UC
) && (mcg_cap
& MCG_CTL_P
) &&
3056 vcpu
->arch
.mcg_ctl
!= ~(u64
)0)
3058 banks
+= 4 * mce
->bank
;
3060 * if IA32_MCi_CTL is not all 1s, the uncorrected error
3061 * reporting is disabled for the bank
3063 if ((mce
->status
& MCI_STATUS_UC
) && banks
[0] != ~(u64
)0)
3065 if (mce
->status
& MCI_STATUS_UC
) {
3066 if ((vcpu
->arch
.mcg_status
& MCG_STATUS_MCIP
) ||
3067 !kvm_read_cr4_bits(vcpu
, X86_CR4_MCE
)) {
3068 kvm_make_request(KVM_REQ_TRIPLE_FAULT
, vcpu
);
3071 if (banks
[1] & MCI_STATUS_VAL
)
3072 mce
->status
|= MCI_STATUS_OVER
;
3073 banks
[2] = mce
->addr
;
3074 banks
[3] = mce
->misc
;
3075 vcpu
->arch
.mcg_status
= mce
->mcg_status
;
3076 banks
[1] = mce
->status
;
3077 kvm_queue_exception(vcpu
, MC_VECTOR
);
3078 } else if (!(banks
[1] & MCI_STATUS_VAL
)
3079 || !(banks
[1] & MCI_STATUS_UC
)) {
3080 if (banks
[1] & MCI_STATUS_VAL
)
3081 mce
->status
|= MCI_STATUS_OVER
;
3082 banks
[2] = mce
->addr
;
3083 banks
[3] = mce
->misc
;
3084 banks
[1] = mce
->status
;
3086 banks
[1] |= MCI_STATUS_OVER
;
3090 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu
*vcpu
,
3091 struct kvm_vcpu_events
*events
)
3095 * FIXME: pass injected and pending separately. This is only
3096 * needed for nested virtualization, whose state cannot be
3097 * migrated yet. For now we can combine them.
3099 events
->exception
.injected
=
3100 (vcpu
->arch
.exception
.pending
||
3101 vcpu
->arch
.exception
.injected
) &&
3102 !kvm_exception_is_soft(vcpu
->arch
.exception
.nr
);
3103 events
->exception
.nr
= vcpu
->arch
.exception
.nr
;
3104 events
->exception
.has_error_code
= vcpu
->arch
.exception
.has_error_code
;
3105 events
->exception
.pad
= 0;
3106 events
->exception
.error_code
= vcpu
->arch
.exception
.error_code
;
3108 events
->interrupt
.injected
=
3109 vcpu
->arch
.interrupt
.pending
&& !vcpu
->arch
.interrupt
.soft
;
3110 events
->interrupt
.nr
= vcpu
->arch
.interrupt
.nr
;
3111 events
->interrupt
.soft
= 0;
3112 events
->interrupt
.shadow
= kvm_x86_ops
->get_interrupt_shadow(vcpu
);
3114 events
->nmi
.injected
= vcpu
->arch
.nmi_injected
;
3115 events
->nmi
.pending
= vcpu
->arch
.nmi_pending
!= 0;
3116 events
->nmi
.masked
= kvm_x86_ops
->get_nmi_mask(vcpu
);
3117 events
->nmi
.pad
= 0;
3119 events
->sipi_vector
= 0; /* never valid when reporting to user space */
3121 events
->smi
.smm
= is_smm(vcpu
);
3122 events
->smi
.pending
= vcpu
->arch
.smi_pending
;
3123 events
->smi
.smm_inside_nmi
=
3124 !!(vcpu
->arch
.hflags
& HF_SMM_INSIDE_NMI_MASK
);
3125 events
->smi
.latched_init
= kvm_lapic_latched_init(vcpu
);
3127 events
->flags
= (KVM_VCPUEVENT_VALID_NMI_PENDING
3128 | KVM_VCPUEVENT_VALID_SHADOW
3129 | KVM_VCPUEVENT_VALID_SMM
);
3130 memset(&events
->reserved
, 0, sizeof(events
->reserved
));
3133 static void kvm_set_hflags(struct kvm_vcpu
*vcpu
, unsigned emul_flags
);
3135 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu
*vcpu
,
3136 struct kvm_vcpu_events
*events
)
3138 if (events
->flags
& ~(KVM_VCPUEVENT_VALID_NMI_PENDING
3139 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
3140 | KVM_VCPUEVENT_VALID_SHADOW
3141 | KVM_VCPUEVENT_VALID_SMM
))
3144 if (events
->exception
.injected
&&
3145 (events
->exception
.nr
> 31 || events
->exception
.nr
== NMI_VECTOR
||
3146 is_guest_mode(vcpu
)))
3149 /* INITs are latched while in SMM */
3150 if (events
->flags
& KVM_VCPUEVENT_VALID_SMM
&&
3151 (events
->smi
.smm
|| events
->smi
.pending
) &&
3152 vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
)
3156 vcpu
->arch
.exception
.injected
= false;
3157 vcpu
->arch
.exception
.pending
= events
->exception
.injected
;
3158 vcpu
->arch
.exception
.nr
= events
->exception
.nr
;
3159 vcpu
->arch
.exception
.has_error_code
= events
->exception
.has_error_code
;
3160 vcpu
->arch
.exception
.error_code
= events
->exception
.error_code
;
3162 vcpu
->arch
.interrupt
.pending
= events
->interrupt
.injected
;
3163 vcpu
->arch
.interrupt
.nr
= events
->interrupt
.nr
;
3164 vcpu
->arch
.interrupt
.soft
= events
->interrupt
.soft
;
3165 if (events
->flags
& KVM_VCPUEVENT_VALID_SHADOW
)
3166 kvm_x86_ops
->set_interrupt_shadow(vcpu
,
3167 events
->interrupt
.shadow
);
3169 vcpu
->arch
.nmi_injected
= events
->nmi
.injected
;
3170 if (events
->flags
& KVM_VCPUEVENT_VALID_NMI_PENDING
)
3171 vcpu
->arch
.nmi_pending
= events
->nmi
.pending
;
3172 kvm_x86_ops
->set_nmi_mask(vcpu
, events
->nmi
.masked
);
3174 if (events
->flags
& KVM_VCPUEVENT_VALID_SIPI_VECTOR
&&
3175 lapic_in_kernel(vcpu
))
3176 vcpu
->arch
.apic
->sipi_vector
= events
->sipi_vector
;
3178 if (events
->flags
& KVM_VCPUEVENT_VALID_SMM
) {
3179 u32 hflags
= vcpu
->arch
.hflags
;
3180 if (events
->smi
.smm
)
3181 hflags
|= HF_SMM_MASK
;
3183 hflags
&= ~HF_SMM_MASK
;
3184 kvm_set_hflags(vcpu
, hflags
);
3186 vcpu
->arch
.smi_pending
= events
->smi
.pending
;
3188 if (events
->smi
.smm
) {
3189 if (events
->smi
.smm_inside_nmi
)
3190 vcpu
->arch
.hflags
|= HF_SMM_INSIDE_NMI_MASK
;
3192 vcpu
->arch
.hflags
&= ~HF_SMM_INSIDE_NMI_MASK
;
3193 if (lapic_in_kernel(vcpu
)) {
3194 if (events
->smi
.latched_init
)
3195 set_bit(KVM_APIC_INIT
, &vcpu
->arch
.apic
->pending_events
);
3197 clear_bit(KVM_APIC_INIT
, &vcpu
->arch
.apic
->pending_events
);
3202 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
3207 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu
*vcpu
,
3208 struct kvm_debugregs
*dbgregs
)
3212 memcpy(dbgregs
->db
, vcpu
->arch
.db
, sizeof(vcpu
->arch
.db
));
3213 kvm_get_dr(vcpu
, 6, &val
);
3215 dbgregs
->dr7
= vcpu
->arch
.dr7
;
3217 memset(&dbgregs
->reserved
, 0, sizeof(dbgregs
->reserved
));
3220 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu
*vcpu
,
3221 struct kvm_debugregs
*dbgregs
)
3226 if (dbgregs
->dr6
& ~0xffffffffull
)
3228 if (dbgregs
->dr7
& ~0xffffffffull
)
3231 memcpy(vcpu
->arch
.db
, dbgregs
->db
, sizeof(vcpu
->arch
.db
));
3232 kvm_update_dr0123(vcpu
);
3233 vcpu
->arch
.dr6
= dbgregs
->dr6
;
3234 kvm_update_dr6(vcpu
);
3235 vcpu
->arch
.dr7
= dbgregs
->dr7
;
3236 kvm_update_dr7(vcpu
);
3241 #define XSTATE_COMPACTION_ENABLED (1ULL << 63)
3243 static void fill_xsave(u8
*dest
, struct kvm_vcpu
*vcpu
)
3245 struct xregs_state
*xsave
= &vcpu
->arch
.guest_fpu
.state
.xsave
;
3246 u64 xstate_bv
= xsave
->header
.xfeatures
;
3250 * Copy legacy XSAVE area, to avoid complications with CPUID
3251 * leaves 0 and 1 in the loop below.
3253 memcpy(dest
, xsave
, XSAVE_HDR_OFFSET
);
3256 xstate_bv
&= vcpu
->arch
.guest_supported_xcr0
| XFEATURE_MASK_FPSSE
;
3257 *(u64
*)(dest
+ XSAVE_HDR_OFFSET
) = xstate_bv
;
3260 * Copy each region from the possibly compacted offset to the
3261 * non-compacted offset.
3263 valid
= xstate_bv
& ~XFEATURE_MASK_FPSSE
;
3265 u64 feature
= valid
& -valid
;
3266 int index
= fls64(feature
) - 1;
3267 void *src
= get_xsave_addr(xsave
, feature
);
3270 u32 size
, offset
, ecx
, edx
;
3271 cpuid_count(XSTATE_CPUID
, index
,
3272 &size
, &offset
, &ecx
, &edx
);
3273 if (feature
== XFEATURE_MASK_PKRU
)
3274 memcpy(dest
+ offset
, &vcpu
->arch
.pkru
,
3275 sizeof(vcpu
->arch
.pkru
));
3277 memcpy(dest
+ offset
, src
, size
);
3285 static void load_xsave(struct kvm_vcpu
*vcpu
, u8
*src
)
3287 struct xregs_state
*xsave
= &vcpu
->arch
.guest_fpu
.state
.xsave
;
3288 u64 xstate_bv
= *(u64
*)(src
+ XSAVE_HDR_OFFSET
);
3292 * Copy legacy XSAVE area, to avoid complications with CPUID
3293 * leaves 0 and 1 in the loop below.
3295 memcpy(xsave
, src
, XSAVE_HDR_OFFSET
);
3297 /* Set XSTATE_BV and possibly XCOMP_BV. */
3298 xsave
->header
.xfeatures
= xstate_bv
;
3299 if (boot_cpu_has(X86_FEATURE_XSAVES
))
3300 xsave
->header
.xcomp_bv
= host_xcr0
| XSTATE_COMPACTION_ENABLED
;
3303 * Copy each region from the non-compacted offset to the
3304 * possibly compacted offset.
3306 valid
= xstate_bv
& ~XFEATURE_MASK_FPSSE
;
3308 u64 feature
= valid
& -valid
;
3309 int index
= fls64(feature
) - 1;
3310 void *dest
= get_xsave_addr(xsave
, feature
);
3313 u32 size
, offset
, ecx
, edx
;
3314 cpuid_count(XSTATE_CPUID
, index
,
3315 &size
, &offset
, &ecx
, &edx
);
3316 if (feature
== XFEATURE_MASK_PKRU
)
3317 memcpy(&vcpu
->arch
.pkru
, src
+ offset
,
3318 sizeof(vcpu
->arch
.pkru
));
3320 memcpy(dest
, src
+ offset
, size
);
3327 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu
*vcpu
,
3328 struct kvm_xsave
*guest_xsave
)
3330 if (boot_cpu_has(X86_FEATURE_XSAVE
)) {
3331 memset(guest_xsave
, 0, sizeof(struct kvm_xsave
));
3332 fill_xsave((u8
*) guest_xsave
->region
, vcpu
);
3334 memcpy(guest_xsave
->region
,
3335 &vcpu
->arch
.guest_fpu
.state
.fxsave
,
3336 sizeof(struct fxregs_state
));
3337 *(u64
*)&guest_xsave
->region
[XSAVE_HDR_OFFSET
/ sizeof(u32
)] =
3338 XFEATURE_MASK_FPSSE
;
3342 #define XSAVE_MXCSR_OFFSET 24
3344 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu
*vcpu
,
3345 struct kvm_xsave
*guest_xsave
)
3348 *(u64
*)&guest_xsave
->region
[XSAVE_HDR_OFFSET
/ sizeof(u32
)];
3349 u32 mxcsr
= *(u32
*)&guest_xsave
->region
[XSAVE_MXCSR_OFFSET
/ sizeof(u32
)];
3351 if (boot_cpu_has(X86_FEATURE_XSAVE
)) {
3353 * Here we allow setting states that are not present in
3354 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility
3355 * with old userspace.
3357 if (xstate_bv
& ~kvm_supported_xcr0() ||
3358 mxcsr
& ~mxcsr_feature_mask
)
3360 load_xsave(vcpu
, (u8
*)guest_xsave
->region
);
3362 if (xstate_bv
& ~XFEATURE_MASK_FPSSE
||
3363 mxcsr
& ~mxcsr_feature_mask
)
3365 memcpy(&vcpu
->arch
.guest_fpu
.state
.fxsave
,
3366 guest_xsave
->region
, sizeof(struct fxregs_state
));
3371 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu
*vcpu
,
3372 struct kvm_xcrs
*guest_xcrs
)
3374 if (!boot_cpu_has(X86_FEATURE_XSAVE
)) {
3375 guest_xcrs
->nr_xcrs
= 0;
3379 guest_xcrs
->nr_xcrs
= 1;
3380 guest_xcrs
->flags
= 0;
3381 guest_xcrs
->xcrs
[0].xcr
= XCR_XFEATURE_ENABLED_MASK
;
3382 guest_xcrs
->xcrs
[0].value
= vcpu
->arch
.xcr0
;
3385 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu
*vcpu
,
3386 struct kvm_xcrs
*guest_xcrs
)
3390 if (!boot_cpu_has(X86_FEATURE_XSAVE
))
3393 if (guest_xcrs
->nr_xcrs
> KVM_MAX_XCRS
|| guest_xcrs
->flags
)
3396 for (i
= 0; i
< guest_xcrs
->nr_xcrs
; i
++)
3397 /* Only support XCR0 currently */
3398 if (guest_xcrs
->xcrs
[i
].xcr
== XCR_XFEATURE_ENABLED_MASK
) {
3399 r
= __kvm_set_xcr(vcpu
, XCR_XFEATURE_ENABLED_MASK
,
3400 guest_xcrs
->xcrs
[i
].value
);
3409 * kvm_set_guest_paused() indicates to the guest kernel that it has been
3410 * stopped by the hypervisor. This function will be called from the host only.
3411 * EINVAL is returned when the host attempts to set the flag for a guest that
3412 * does not support pv clocks.
3414 static int kvm_set_guest_paused(struct kvm_vcpu
*vcpu
)
3416 if (!vcpu
->arch
.pv_time_enabled
)
3418 vcpu
->arch
.pvclock_set_guest_stopped_request
= true;
3419 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
3423 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu
*vcpu
,
3424 struct kvm_enable_cap
*cap
)
3430 case KVM_CAP_HYPERV_SYNIC2
:
3433 case KVM_CAP_HYPERV_SYNIC
:
3434 if (!irqchip_in_kernel(vcpu
->kvm
))
3436 return kvm_hv_activate_synic(vcpu
, cap
->cap
==
3437 KVM_CAP_HYPERV_SYNIC2
);
3443 long kvm_arch_vcpu_ioctl(struct file
*filp
,
3444 unsigned int ioctl
, unsigned long arg
)
3446 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3447 void __user
*argp
= (void __user
*)arg
;
3450 struct kvm_lapic_state
*lapic
;
3451 struct kvm_xsave
*xsave
;
3452 struct kvm_xcrs
*xcrs
;
3458 case KVM_GET_LAPIC
: {
3460 if (!lapic_in_kernel(vcpu
))
3462 u
.lapic
= kzalloc(sizeof(struct kvm_lapic_state
), GFP_KERNEL
);
3467 r
= kvm_vcpu_ioctl_get_lapic(vcpu
, u
.lapic
);
3471 if (copy_to_user(argp
, u
.lapic
, sizeof(struct kvm_lapic_state
)))
3476 case KVM_SET_LAPIC
: {
3478 if (!lapic_in_kernel(vcpu
))
3480 u
.lapic
= memdup_user(argp
, sizeof(*u
.lapic
));
3481 if (IS_ERR(u
.lapic
))
3482 return PTR_ERR(u
.lapic
);
3484 r
= kvm_vcpu_ioctl_set_lapic(vcpu
, u
.lapic
);
3487 case KVM_INTERRUPT
: {
3488 struct kvm_interrupt irq
;
3491 if (copy_from_user(&irq
, argp
, sizeof irq
))
3493 r
= kvm_vcpu_ioctl_interrupt(vcpu
, &irq
);
3497 r
= kvm_vcpu_ioctl_nmi(vcpu
);
3501 r
= kvm_vcpu_ioctl_smi(vcpu
);
3504 case KVM_SET_CPUID
: {
3505 struct kvm_cpuid __user
*cpuid_arg
= argp
;
3506 struct kvm_cpuid cpuid
;
3509 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
3511 r
= kvm_vcpu_ioctl_set_cpuid(vcpu
, &cpuid
, cpuid_arg
->entries
);
3514 case KVM_SET_CPUID2
: {
3515 struct kvm_cpuid2 __user
*cpuid_arg
= argp
;
3516 struct kvm_cpuid2 cpuid
;
3519 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
3521 r
= kvm_vcpu_ioctl_set_cpuid2(vcpu
, &cpuid
,
3522 cpuid_arg
->entries
);
3525 case KVM_GET_CPUID2
: {
3526 struct kvm_cpuid2 __user
*cpuid_arg
= argp
;
3527 struct kvm_cpuid2 cpuid
;
3530 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
3532 r
= kvm_vcpu_ioctl_get_cpuid2(vcpu
, &cpuid
,
3533 cpuid_arg
->entries
);
3537 if (copy_to_user(cpuid_arg
, &cpuid
, sizeof cpuid
))
3543 r
= msr_io(vcpu
, argp
, do_get_msr
, 1);
3546 r
= msr_io(vcpu
, argp
, do_set_msr
, 0);
3548 case KVM_TPR_ACCESS_REPORTING
: {
3549 struct kvm_tpr_access_ctl tac
;
3552 if (copy_from_user(&tac
, argp
, sizeof tac
))
3554 r
= vcpu_ioctl_tpr_access_reporting(vcpu
, &tac
);
3558 if (copy_to_user(argp
, &tac
, sizeof tac
))
3563 case KVM_SET_VAPIC_ADDR
: {
3564 struct kvm_vapic_addr va
;
3568 if (!lapic_in_kernel(vcpu
))
3571 if (copy_from_user(&va
, argp
, sizeof va
))
3573 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
3574 r
= kvm_lapic_set_vapic_addr(vcpu
, va
.vapic_addr
);
3575 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
3578 case KVM_X86_SETUP_MCE
: {
3582 if (copy_from_user(&mcg_cap
, argp
, sizeof mcg_cap
))
3584 r
= kvm_vcpu_ioctl_x86_setup_mce(vcpu
, mcg_cap
);
3587 case KVM_X86_SET_MCE
: {
3588 struct kvm_x86_mce mce
;
3591 if (copy_from_user(&mce
, argp
, sizeof mce
))
3593 r
= kvm_vcpu_ioctl_x86_set_mce(vcpu
, &mce
);
3596 case KVM_GET_VCPU_EVENTS
: {
3597 struct kvm_vcpu_events events
;
3599 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu
, &events
);
3602 if (copy_to_user(argp
, &events
, sizeof(struct kvm_vcpu_events
)))
3607 case KVM_SET_VCPU_EVENTS
: {
3608 struct kvm_vcpu_events events
;
3611 if (copy_from_user(&events
, argp
, sizeof(struct kvm_vcpu_events
)))
3614 r
= kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu
, &events
);
3617 case KVM_GET_DEBUGREGS
: {
3618 struct kvm_debugregs dbgregs
;
3620 kvm_vcpu_ioctl_x86_get_debugregs(vcpu
, &dbgregs
);
3623 if (copy_to_user(argp
, &dbgregs
,
3624 sizeof(struct kvm_debugregs
)))
3629 case KVM_SET_DEBUGREGS
: {
3630 struct kvm_debugregs dbgregs
;
3633 if (copy_from_user(&dbgregs
, argp
,
3634 sizeof(struct kvm_debugregs
)))
3637 r
= kvm_vcpu_ioctl_x86_set_debugregs(vcpu
, &dbgregs
);
3640 case KVM_GET_XSAVE
: {
3641 u
.xsave
= kzalloc(sizeof(struct kvm_xsave
), GFP_KERNEL
);
3646 kvm_vcpu_ioctl_x86_get_xsave(vcpu
, u
.xsave
);
3649 if (copy_to_user(argp
, u
.xsave
, sizeof(struct kvm_xsave
)))
3654 case KVM_SET_XSAVE
: {
3655 u
.xsave
= memdup_user(argp
, sizeof(*u
.xsave
));
3656 if (IS_ERR(u
.xsave
))
3657 return PTR_ERR(u
.xsave
);
3659 r
= kvm_vcpu_ioctl_x86_set_xsave(vcpu
, u
.xsave
);
3662 case KVM_GET_XCRS
: {
3663 u
.xcrs
= kzalloc(sizeof(struct kvm_xcrs
), GFP_KERNEL
);
3668 kvm_vcpu_ioctl_x86_get_xcrs(vcpu
, u
.xcrs
);
3671 if (copy_to_user(argp
, u
.xcrs
,
3672 sizeof(struct kvm_xcrs
)))
3677 case KVM_SET_XCRS
: {
3678 u
.xcrs
= memdup_user(argp
, sizeof(*u
.xcrs
));
3680 return PTR_ERR(u
.xcrs
);
3682 r
= kvm_vcpu_ioctl_x86_set_xcrs(vcpu
, u
.xcrs
);
3685 case KVM_SET_TSC_KHZ
: {
3689 user_tsc_khz
= (u32
)arg
;
3691 if (user_tsc_khz
>= kvm_max_guest_tsc_khz
)
3694 if (user_tsc_khz
== 0)
3695 user_tsc_khz
= tsc_khz
;
3697 if (!kvm_set_tsc_khz(vcpu
, user_tsc_khz
))
3702 case KVM_GET_TSC_KHZ
: {
3703 r
= vcpu
->arch
.virtual_tsc_khz
;
3706 case KVM_KVMCLOCK_CTRL
: {
3707 r
= kvm_set_guest_paused(vcpu
);
3710 case KVM_ENABLE_CAP
: {
3711 struct kvm_enable_cap cap
;
3714 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
3716 r
= kvm_vcpu_ioctl_enable_cap(vcpu
, &cap
);
3727 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
3729 return VM_FAULT_SIGBUS
;
3732 static int kvm_vm_ioctl_set_tss_addr(struct kvm
*kvm
, unsigned long addr
)
3736 if (addr
> (unsigned int)(-3 * PAGE_SIZE
))
3738 ret
= kvm_x86_ops
->set_tss_addr(kvm
, addr
);
3742 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm
*kvm
,
3745 kvm
->arch
.ept_identity_map_addr
= ident_addr
;
3749 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm
*kvm
,
3750 u32 kvm_nr_mmu_pages
)
3752 if (kvm_nr_mmu_pages
< KVM_MIN_ALLOC_MMU_PAGES
)
3755 mutex_lock(&kvm
->slots_lock
);
3757 kvm_mmu_change_mmu_pages(kvm
, kvm_nr_mmu_pages
);
3758 kvm
->arch
.n_requested_mmu_pages
= kvm_nr_mmu_pages
;
3760 mutex_unlock(&kvm
->slots_lock
);
3764 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm
*kvm
)
3766 return kvm
->arch
.n_max_mmu_pages
;
3769 static int kvm_vm_ioctl_get_irqchip(struct kvm
*kvm
, struct kvm_irqchip
*chip
)
3771 struct kvm_pic
*pic
= kvm
->arch
.vpic
;
3775 switch (chip
->chip_id
) {
3776 case KVM_IRQCHIP_PIC_MASTER
:
3777 memcpy(&chip
->chip
.pic
, &pic
->pics
[0],
3778 sizeof(struct kvm_pic_state
));
3780 case KVM_IRQCHIP_PIC_SLAVE
:
3781 memcpy(&chip
->chip
.pic
, &pic
->pics
[1],
3782 sizeof(struct kvm_pic_state
));
3784 case KVM_IRQCHIP_IOAPIC
:
3785 kvm_get_ioapic(kvm
, &chip
->chip
.ioapic
);
3794 static int kvm_vm_ioctl_set_irqchip(struct kvm
*kvm
, struct kvm_irqchip
*chip
)
3796 struct kvm_pic
*pic
= kvm
->arch
.vpic
;
3800 switch (chip
->chip_id
) {
3801 case KVM_IRQCHIP_PIC_MASTER
:
3802 spin_lock(&pic
->lock
);
3803 memcpy(&pic
->pics
[0], &chip
->chip
.pic
,
3804 sizeof(struct kvm_pic_state
));
3805 spin_unlock(&pic
->lock
);
3807 case KVM_IRQCHIP_PIC_SLAVE
:
3808 spin_lock(&pic
->lock
);
3809 memcpy(&pic
->pics
[1], &chip
->chip
.pic
,
3810 sizeof(struct kvm_pic_state
));
3811 spin_unlock(&pic
->lock
);
3813 case KVM_IRQCHIP_IOAPIC
:
3814 kvm_set_ioapic(kvm
, &chip
->chip
.ioapic
);
3820 kvm_pic_update_irq(pic
);
3824 static int kvm_vm_ioctl_get_pit(struct kvm
*kvm
, struct kvm_pit_state
*ps
)
3826 struct kvm_kpit_state
*kps
= &kvm
->arch
.vpit
->pit_state
;
3828 BUILD_BUG_ON(sizeof(*ps
) != sizeof(kps
->channels
));
3830 mutex_lock(&kps
->lock
);
3831 memcpy(ps
, &kps
->channels
, sizeof(*ps
));
3832 mutex_unlock(&kps
->lock
);
3836 static int kvm_vm_ioctl_set_pit(struct kvm
*kvm
, struct kvm_pit_state
*ps
)
3839 struct kvm_pit
*pit
= kvm
->arch
.vpit
;
3841 mutex_lock(&pit
->pit_state
.lock
);
3842 memcpy(&pit
->pit_state
.channels
, ps
, sizeof(*ps
));
3843 for (i
= 0; i
< 3; i
++)
3844 kvm_pit_load_count(pit
, i
, ps
->channels
[i
].count
, 0);
3845 mutex_unlock(&pit
->pit_state
.lock
);
3849 static int kvm_vm_ioctl_get_pit2(struct kvm
*kvm
, struct kvm_pit_state2
*ps
)
3851 mutex_lock(&kvm
->arch
.vpit
->pit_state
.lock
);
3852 memcpy(ps
->channels
, &kvm
->arch
.vpit
->pit_state
.channels
,
3853 sizeof(ps
->channels
));
3854 ps
->flags
= kvm
->arch
.vpit
->pit_state
.flags
;
3855 mutex_unlock(&kvm
->arch
.vpit
->pit_state
.lock
);
3856 memset(&ps
->reserved
, 0, sizeof(ps
->reserved
));
3860 static int kvm_vm_ioctl_set_pit2(struct kvm
*kvm
, struct kvm_pit_state2
*ps
)
3864 u32 prev_legacy
, cur_legacy
;
3865 struct kvm_pit
*pit
= kvm
->arch
.vpit
;
3867 mutex_lock(&pit
->pit_state
.lock
);
3868 prev_legacy
= pit
->pit_state
.flags
& KVM_PIT_FLAGS_HPET_LEGACY
;
3869 cur_legacy
= ps
->flags
& KVM_PIT_FLAGS_HPET_LEGACY
;
3870 if (!prev_legacy
&& cur_legacy
)
3872 memcpy(&pit
->pit_state
.channels
, &ps
->channels
,
3873 sizeof(pit
->pit_state
.channels
));
3874 pit
->pit_state
.flags
= ps
->flags
;
3875 for (i
= 0; i
< 3; i
++)
3876 kvm_pit_load_count(pit
, i
, pit
->pit_state
.channels
[i
].count
,
3878 mutex_unlock(&pit
->pit_state
.lock
);
3882 static int kvm_vm_ioctl_reinject(struct kvm
*kvm
,
3883 struct kvm_reinject_control
*control
)
3885 struct kvm_pit
*pit
= kvm
->arch
.vpit
;
3890 /* pit->pit_state.lock was overloaded to prevent userspace from getting
3891 * an inconsistent state after running multiple KVM_REINJECT_CONTROL
3892 * ioctls in parallel. Use a separate lock if that ioctl isn't rare.
3894 mutex_lock(&pit
->pit_state
.lock
);
3895 kvm_pit_set_reinject(pit
, control
->pit_reinject
);
3896 mutex_unlock(&pit
->pit_state
.lock
);
3902 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
3903 * @kvm: kvm instance
3904 * @log: slot id and address to which we copy the log
3906 * Steps 1-4 below provide general overview of dirty page logging. See
3907 * kvm_get_dirty_log_protect() function description for additional details.
3909 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
3910 * always flush the TLB (step 4) even if previous step failed and the dirty
3911 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
3912 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
3913 * writes will be marked dirty for next log read.
3915 * 1. Take a snapshot of the bit and clear it if needed.
3916 * 2. Write protect the corresponding page.
3917 * 3. Copy the snapshot to the userspace.
3918 * 4. Flush TLB's if needed.
3920 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
3922 bool is_dirty
= false;
3925 mutex_lock(&kvm
->slots_lock
);
3928 * Flush potentially hardware-cached dirty pages to dirty_bitmap.
3930 if (kvm_x86_ops
->flush_log_dirty
)
3931 kvm_x86_ops
->flush_log_dirty(kvm
);
3933 r
= kvm_get_dirty_log_protect(kvm
, log
, &is_dirty
);
3936 * All the TLBs can be flushed out of mmu lock, see the comments in
3937 * kvm_mmu_slot_remove_write_access().
3939 lockdep_assert_held(&kvm
->slots_lock
);
3941 kvm_flush_remote_tlbs(kvm
);
3943 mutex_unlock(&kvm
->slots_lock
);
3947 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_event
,
3950 if (!irqchip_in_kernel(kvm
))
3953 irq_event
->status
= kvm_set_irq(kvm
, KVM_USERSPACE_IRQ_SOURCE_ID
,
3954 irq_event
->irq
, irq_event
->level
,
3959 static int kvm_vm_ioctl_enable_cap(struct kvm
*kvm
,
3960 struct kvm_enable_cap
*cap
)
3968 case KVM_CAP_DISABLE_QUIRKS
:
3969 kvm
->arch
.disabled_quirks
= cap
->args
[0];
3972 case KVM_CAP_SPLIT_IRQCHIP
: {
3973 mutex_lock(&kvm
->lock
);
3975 if (cap
->args
[0] > MAX_NR_RESERVED_IOAPIC_PINS
)
3976 goto split_irqchip_unlock
;
3978 if (irqchip_in_kernel(kvm
))
3979 goto split_irqchip_unlock
;
3980 if (kvm
->created_vcpus
)
3981 goto split_irqchip_unlock
;
3982 r
= kvm_setup_empty_irq_routing(kvm
);
3984 goto split_irqchip_unlock
;
3985 /* Pairs with irqchip_in_kernel. */
3987 kvm
->arch
.irqchip_mode
= KVM_IRQCHIP_SPLIT
;
3988 kvm
->arch
.nr_reserved_ioapic_pins
= cap
->args
[0];
3990 split_irqchip_unlock
:
3991 mutex_unlock(&kvm
->lock
);
3994 case KVM_CAP_X2APIC_API
:
3996 if (cap
->args
[0] & ~KVM_X2APIC_API_VALID_FLAGS
)
3999 if (cap
->args
[0] & KVM_X2APIC_API_USE_32BIT_IDS
)
4000 kvm
->arch
.x2apic_format
= true;
4001 if (cap
->args
[0] & KVM_X2APIC_API_DISABLE_BROADCAST_QUIRK
)
4002 kvm
->arch
.x2apic_broadcast_quirk_disabled
= true;
4013 long kvm_arch_vm_ioctl(struct file
*filp
,
4014 unsigned int ioctl
, unsigned long arg
)
4016 struct kvm
*kvm
= filp
->private_data
;
4017 void __user
*argp
= (void __user
*)arg
;
4020 * This union makes it completely explicit to gcc-3.x
4021 * that these two variables' stack usage should be
4022 * combined, not added together.
4025 struct kvm_pit_state ps
;
4026 struct kvm_pit_state2 ps2
;
4027 struct kvm_pit_config pit_config
;
4031 case KVM_SET_TSS_ADDR
:
4032 r
= kvm_vm_ioctl_set_tss_addr(kvm
, arg
);
4034 case KVM_SET_IDENTITY_MAP_ADDR
: {
4038 if (copy_from_user(&ident_addr
, argp
, sizeof ident_addr
))
4040 r
= kvm_vm_ioctl_set_identity_map_addr(kvm
, ident_addr
);
4043 case KVM_SET_NR_MMU_PAGES
:
4044 r
= kvm_vm_ioctl_set_nr_mmu_pages(kvm
, arg
);
4046 case KVM_GET_NR_MMU_PAGES
:
4047 r
= kvm_vm_ioctl_get_nr_mmu_pages(kvm
);
4049 case KVM_CREATE_IRQCHIP
: {
4050 mutex_lock(&kvm
->lock
);
4053 if (irqchip_in_kernel(kvm
))
4054 goto create_irqchip_unlock
;
4057 if (kvm
->created_vcpus
)
4058 goto create_irqchip_unlock
;
4060 r
= kvm_pic_init(kvm
);
4062 goto create_irqchip_unlock
;
4064 r
= kvm_ioapic_init(kvm
);
4066 kvm_pic_destroy(kvm
);
4067 goto create_irqchip_unlock
;
4070 r
= kvm_setup_default_irq_routing(kvm
);
4072 kvm_ioapic_destroy(kvm
);
4073 kvm_pic_destroy(kvm
);
4074 goto create_irqchip_unlock
;
4076 /* Write kvm->irq_routing before enabling irqchip_in_kernel. */
4078 kvm
->arch
.irqchip_mode
= KVM_IRQCHIP_KERNEL
;
4079 create_irqchip_unlock
:
4080 mutex_unlock(&kvm
->lock
);
4083 case KVM_CREATE_PIT
:
4084 u
.pit_config
.flags
= KVM_PIT_SPEAKER_DUMMY
;
4086 case KVM_CREATE_PIT2
:
4088 if (copy_from_user(&u
.pit_config
, argp
,
4089 sizeof(struct kvm_pit_config
)))
4092 mutex_lock(&kvm
->lock
);
4095 goto create_pit_unlock
;
4097 kvm
->arch
.vpit
= kvm_create_pit(kvm
, u
.pit_config
.flags
);
4101 mutex_unlock(&kvm
->lock
);
4103 case KVM_GET_IRQCHIP
: {
4104 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
4105 struct kvm_irqchip
*chip
;
4107 chip
= memdup_user(argp
, sizeof(*chip
));
4114 if (!irqchip_kernel(kvm
))
4115 goto get_irqchip_out
;
4116 r
= kvm_vm_ioctl_get_irqchip(kvm
, chip
);
4118 goto get_irqchip_out
;
4120 if (copy_to_user(argp
, chip
, sizeof *chip
))
4121 goto get_irqchip_out
;
4127 case KVM_SET_IRQCHIP
: {
4128 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
4129 struct kvm_irqchip
*chip
;
4131 chip
= memdup_user(argp
, sizeof(*chip
));
4138 if (!irqchip_kernel(kvm
))
4139 goto set_irqchip_out
;
4140 r
= kvm_vm_ioctl_set_irqchip(kvm
, chip
);
4142 goto set_irqchip_out
;
4150 if (copy_from_user(&u
.ps
, argp
, sizeof(struct kvm_pit_state
)))
4153 if (!kvm
->arch
.vpit
)
4155 r
= kvm_vm_ioctl_get_pit(kvm
, &u
.ps
);
4159 if (copy_to_user(argp
, &u
.ps
, sizeof(struct kvm_pit_state
)))
4166 if (copy_from_user(&u
.ps
, argp
, sizeof u
.ps
))
4169 if (!kvm
->arch
.vpit
)
4171 r
= kvm_vm_ioctl_set_pit(kvm
, &u
.ps
);
4174 case KVM_GET_PIT2
: {
4176 if (!kvm
->arch
.vpit
)
4178 r
= kvm_vm_ioctl_get_pit2(kvm
, &u
.ps2
);
4182 if (copy_to_user(argp
, &u
.ps2
, sizeof(u
.ps2
)))
4187 case KVM_SET_PIT2
: {
4189 if (copy_from_user(&u
.ps2
, argp
, sizeof(u
.ps2
)))
4192 if (!kvm
->arch
.vpit
)
4194 r
= kvm_vm_ioctl_set_pit2(kvm
, &u
.ps2
);
4197 case KVM_REINJECT_CONTROL
: {
4198 struct kvm_reinject_control control
;
4200 if (copy_from_user(&control
, argp
, sizeof(control
)))
4202 r
= kvm_vm_ioctl_reinject(kvm
, &control
);
4205 case KVM_SET_BOOT_CPU_ID
:
4207 mutex_lock(&kvm
->lock
);
4208 if (kvm
->created_vcpus
)
4211 kvm
->arch
.bsp_vcpu_id
= arg
;
4212 mutex_unlock(&kvm
->lock
);
4214 case KVM_XEN_HVM_CONFIG
: {
4216 if (copy_from_user(&kvm
->arch
.xen_hvm_config
, argp
,
4217 sizeof(struct kvm_xen_hvm_config
)))
4220 if (kvm
->arch
.xen_hvm_config
.flags
)
4225 case KVM_SET_CLOCK
: {
4226 struct kvm_clock_data user_ns
;
4230 if (copy_from_user(&user_ns
, argp
, sizeof(user_ns
)))
4239 * TODO: userspace has to take care of races with VCPU_RUN, so
4240 * kvm_gen_update_masterclock() can be cut down to locked
4241 * pvclock_update_vm_gtod_copy().
4243 kvm_gen_update_masterclock(kvm
);
4244 now_ns
= get_kvmclock_ns(kvm
);
4245 kvm
->arch
.kvmclock_offset
+= user_ns
.clock
- now_ns
;
4246 kvm_make_all_cpus_request(kvm
, KVM_REQ_CLOCK_UPDATE
);
4249 case KVM_GET_CLOCK
: {
4250 struct kvm_clock_data user_ns
;
4253 now_ns
= get_kvmclock_ns(kvm
);
4254 user_ns
.clock
= now_ns
;
4255 user_ns
.flags
= kvm
->arch
.use_master_clock
? KVM_CLOCK_TSC_STABLE
: 0;
4256 memset(&user_ns
.pad
, 0, sizeof(user_ns
.pad
));
4259 if (copy_to_user(argp
, &user_ns
, sizeof(user_ns
)))
4264 case KVM_ENABLE_CAP
: {
4265 struct kvm_enable_cap cap
;
4268 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
4270 r
= kvm_vm_ioctl_enable_cap(kvm
, &cap
);
4280 static void kvm_init_msr_list(void)
4285 for (i
= j
= 0; i
< ARRAY_SIZE(msrs_to_save
); i
++) {
4286 if (rdmsr_safe(msrs_to_save
[i
], &dummy
[0], &dummy
[1]) < 0)
4290 * Even MSRs that are valid in the host may not be exposed
4291 * to the guests in some cases.
4293 switch (msrs_to_save
[i
]) {
4294 case MSR_IA32_BNDCFGS
:
4295 if (!kvm_x86_ops
->mpx_supported())
4299 if (!kvm_x86_ops
->rdtscp_supported())
4307 msrs_to_save
[j
] = msrs_to_save
[i
];
4310 num_msrs_to_save
= j
;
4312 for (i
= j
= 0; i
< ARRAY_SIZE(emulated_msrs
); i
++) {
4313 switch (emulated_msrs
[i
]) {
4314 case MSR_IA32_SMBASE
:
4315 if (!kvm_x86_ops
->cpu_has_high_real_mode_segbase())
4323 emulated_msrs
[j
] = emulated_msrs
[i
];
4326 num_emulated_msrs
= j
;
4329 static int vcpu_mmio_write(struct kvm_vcpu
*vcpu
, gpa_t addr
, int len
,
4337 if (!(lapic_in_kernel(vcpu
) &&
4338 !kvm_iodevice_write(vcpu
, &vcpu
->arch
.apic
->dev
, addr
, n
, v
))
4339 && kvm_io_bus_write(vcpu
, KVM_MMIO_BUS
, addr
, n
, v
))
4350 static int vcpu_mmio_read(struct kvm_vcpu
*vcpu
, gpa_t addr
, int len
, void *v
)
4357 if (!(lapic_in_kernel(vcpu
) &&
4358 !kvm_iodevice_read(vcpu
, &vcpu
->arch
.apic
->dev
,
4360 && kvm_io_bus_read(vcpu
, KVM_MMIO_BUS
, addr
, n
, v
))
4362 trace_kvm_mmio(KVM_TRACE_MMIO_READ
, n
, addr
, *(u64
*)v
);
4372 static void kvm_set_segment(struct kvm_vcpu
*vcpu
,
4373 struct kvm_segment
*var
, int seg
)
4375 kvm_x86_ops
->set_segment(vcpu
, var
, seg
);
4378 void kvm_get_segment(struct kvm_vcpu
*vcpu
,
4379 struct kvm_segment
*var
, int seg
)
4381 kvm_x86_ops
->get_segment(vcpu
, var
, seg
);
4384 gpa_t
translate_nested_gpa(struct kvm_vcpu
*vcpu
, gpa_t gpa
, u32 access
,
4385 struct x86_exception
*exception
)
4389 BUG_ON(!mmu_is_nested(vcpu
));
4391 /* NPT walks are always user-walks */
4392 access
|= PFERR_USER_MASK
;
4393 t_gpa
= vcpu
->arch
.mmu
.gva_to_gpa(vcpu
, gpa
, access
, exception
);
4398 gpa_t
kvm_mmu_gva_to_gpa_read(struct kvm_vcpu
*vcpu
, gva_t gva
,
4399 struct x86_exception
*exception
)
4401 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4402 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4405 gpa_t
kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu
*vcpu
, gva_t gva
,
4406 struct x86_exception
*exception
)
4408 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4409 access
|= PFERR_FETCH_MASK
;
4410 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4413 gpa_t
kvm_mmu_gva_to_gpa_write(struct kvm_vcpu
*vcpu
, gva_t gva
,
4414 struct x86_exception
*exception
)
4416 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4417 access
|= PFERR_WRITE_MASK
;
4418 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4421 /* uses this to access any guest's mapped memory without checking CPL */
4422 gpa_t
kvm_mmu_gva_to_gpa_system(struct kvm_vcpu
*vcpu
, gva_t gva
,
4423 struct x86_exception
*exception
)
4425 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, 0, exception
);
4428 static int kvm_read_guest_virt_helper(gva_t addr
, void *val
, unsigned int bytes
,
4429 struct kvm_vcpu
*vcpu
, u32 access
,
4430 struct x86_exception
*exception
)
4433 int r
= X86EMUL_CONTINUE
;
4436 gpa_t gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, addr
, access
,
4438 unsigned offset
= addr
& (PAGE_SIZE
-1);
4439 unsigned toread
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
4442 if (gpa
== UNMAPPED_GVA
)
4443 return X86EMUL_PROPAGATE_FAULT
;
4444 ret
= kvm_vcpu_read_guest_page(vcpu
, gpa
>> PAGE_SHIFT
, data
,
4447 r
= X86EMUL_IO_NEEDED
;
4459 /* used for instruction fetching */
4460 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt
*ctxt
,
4461 gva_t addr
, void *val
, unsigned int bytes
,
4462 struct x86_exception
*exception
)
4464 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4465 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4469 /* Inline kvm_read_guest_virt_helper for speed. */
4470 gpa_t gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, addr
, access
|PFERR_FETCH_MASK
,
4472 if (unlikely(gpa
== UNMAPPED_GVA
))
4473 return X86EMUL_PROPAGATE_FAULT
;
4475 offset
= addr
& (PAGE_SIZE
-1);
4476 if (WARN_ON(offset
+ bytes
> PAGE_SIZE
))
4477 bytes
= (unsigned)PAGE_SIZE
- offset
;
4478 ret
= kvm_vcpu_read_guest_page(vcpu
, gpa
>> PAGE_SHIFT
, val
,
4480 if (unlikely(ret
< 0))
4481 return X86EMUL_IO_NEEDED
;
4483 return X86EMUL_CONTINUE
;
4486 int kvm_read_guest_virt(struct x86_emulate_ctxt
*ctxt
,
4487 gva_t addr
, void *val
, unsigned int bytes
,
4488 struct x86_exception
*exception
)
4490 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4491 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4493 return kvm_read_guest_virt_helper(addr
, val
, bytes
, vcpu
, access
,
4496 EXPORT_SYMBOL_GPL(kvm_read_guest_virt
);
4498 static int kvm_read_guest_virt_system(struct x86_emulate_ctxt
*ctxt
,
4499 gva_t addr
, void *val
, unsigned int bytes
,
4500 struct x86_exception
*exception
)
4502 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4503 return kvm_read_guest_virt_helper(addr
, val
, bytes
, vcpu
, 0, exception
);
4506 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt
*ctxt
,
4507 unsigned long addr
, void *val
, unsigned int bytes
)
4509 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4510 int r
= kvm_vcpu_read_guest(vcpu
, addr
, val
, bytes
);
4512 return r
< 0 ? X86EMUL_IO_NEEDED
: X86EMUL_CONTINUE
;
4515 int kvm_write_guest_virt_system(struct x86_emulate_ctxt
*ctxt
,
4516 gva_t addr
, void *val
,
4518 struct x86_exception
*exception
)
4520 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4522 int r
= X86EMUL_CONTINUE
;
4525 gpa_t gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, addr
,
4528 unsigned offset
= addr
& (PAGE_SIZE
-1);
4529 unsigned towrite
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
4532 if (gpa
== UNMAPPED_GVA
)
4533 return X86EMUL_PROPAGATE_FAULT
;
4534 ret
= kvm_vcpu_write_guest(vcpu
, gpa
, data
, towrite
);
4536 r
= X86EMUL_IO_NEEDED
;
4547 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system
);
4549 static int vcpu_is_mmio_gpa(struct kvm_vcpu
*vcpu
, unsigned long gva
,
4550 gpa_t gpa
, bool write
)
4552 /* For APIC access vmexit */
4553 if ((gpa
& PAGE_MASK
) == APIC_DEFAULT_PHYS_BASE
)
4556 if (vcpu_match_mmio_gpa(vcpu
, gpa
)) {
4557 trace_vcpu_match_mmio(gva
, gpa
, write
, true);
4564 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu
*vcpu
, unsigned long gva
,
4565 gpa_t
*gpa
, struct x86_exception
*exception
,
4568 u32 access
= ((kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0)
4569 | (write
? PFERR_WRITE_MASK
: 0);
4572 * currently PKRU is only applied to ept enabled guest so
4573 * there is no pkey in EPT page table for L1 guest or EPT
4574 * shadow page table for L2 guest.
4576 if (vcpu_match_mmio_gva(vcpu
, gva
)
4577 && !permission_fault(vcpu
, vcpu
->arch
.walk_mmu
,
4578 vcpu
->arch
.access
, 0, access
)) {
4579 *gpa
= vcpu
->arch
.mmio_gfn
<< PAGE_SHIFT
|
4580 (gva
& (PAGE_SIZE
- 1));
4581 trace_vcpu_match_mmio(gva
, *gpa
, write
, false);
4585 *gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4587 if (*gpa
== UNMAPPED_GVA
)
4590 return vcpu_is_mmio_gpa(vcpu
, gva
, *gpa
, write
);
4593 int emulator_write_phys(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4594 const void *val
, int bytes
)
4598 ret
= kvm_vcpu_write_guest(vcpu
, gpa
, val
, bytes
);
4601 kvm_page_track_write(vcpu
, gpa
, val
, bytes
);
4605 struct read_write_emulator_ops
{
4606 int (*read_write_prepare
)(struct kvm_vcpu
*vcpu
, void *val
,
4608 int (*read_write_emulate
)(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4609 void *val
, int bytes
);
4610 int (*read_write_mmio
)(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4611 int bytes
, void *val
);
4612 int (*read_write_exit_mmio
)(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4613 void *val
, int bytes
);
4617 static int read_prepare(struct kvm_vcpu
*vcpu
, void *val
, int bytes
)
4619 if (vcpu
->mmio_read_completed
) {
4620 trace_kvm_mmio(KVM_TRACE_MMIO_READ
, bytes
,
4621 vcpu
->mmio_fragments
[0].gpa
, *(u64
*)val
);
4622 vcpu
->mmio_read_completed
= 0;
4629 static int read_emulate(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4630 void *val
, int bytes
)
4632 return !kvm_vcpu_read_guest(vcpu
, gpa
, val
, bytes
);
4635 static int write_emulate(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4636 void *val
, int bytes
)
4638 return emulator_write_phys(vcpu
, gpa
, val
, bytes
);
4641 static int write_mmio(struct kvm_vcpu
*vcpu
, gpa_t gpa
, int bytes
, void *val
)
4643 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE
, bytes
, gpa
, *(u64
*)val
);
4644 return vcpu_mmio_write(vcpu
, gpa
, bytes
, val
);
4647 static int read_exit_mmio(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4648 void *val
, int bytes
)
4650 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED
, bytes
, gpa
, 0);
4651 return X86EMUL_IO_NEEDED
;
4654 static int write_exit_mmio(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4655 void *val
, int bytes
)
4657 struct kvm_mmio_fragment
*frag
= &vcpu
->mmio_fragments
[0];
4659 memcpy(vcpu
->run
->mmio
.data
, frag
->data
, min(8u, frag
->len
));
4660 return X86EMUL_CONTINUE
;
4663 static const struct read_write_emulator_ops read_emultor
= {
4664 .read_write_prepare
= read_prepare
,
4665 .read_write_emulate
= read_emulate
,
4666 .read_write_mmio
= vcpu_mmio_read
,
4667 .read_write_exit_mmio
= read_exit_mmio
,
4670 static const struct read_write_emulator_ops write_emultor
= {
4671 .read_write_emulate
= write_emulate
,
4672 .read_write_mmio
= write_mmio
,
4673 .read_write_exit_mmio
= write_exit_mmio
,
4677 static int emulator_read_write_onepage(unsigned long addr
, void *val
,
4679 struct x86_exception
*exception
,
4680 struct kvm_vcpu
*vcpu
,
4681 const struct read_write_emulator_ops
*ops
)
4685 bool write
= ops
->write
;
4686 struct kvm_mmio_fragment
*frag
;
4687 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
4690 * If the exit was due to a NPF we may already have a GPA.
4691 * If the GPA is present, use it to avoid the GVA to GPA table walk.
4692 * Note, this cannot be used on string operations since string
4693 * operation using rep will only have the initial GPA from the NPF
4696 if (vcpu
->arch
.gpa_available
&&
4697 emulator_can_use_gpa(ctxt
) &&
4698 (addr
& ~PAGE_MASK
) == (vcpu
->arch
.gpa_val
& ~PAGE_MASK
)) {
4699 gpa
= vcpu
->arch
.gpa_val
;
4700 ret
= vcpu_is_mmio_gpa(vcpu
, addr
, gpa
, write
);
4702 ret
= vcpu_mmio_gva_to_gpa(vcpu
, addr
, &gpa
, exception
, write
);
4704 return X86EMUL_PROPAGATE_FAULT
;
4707 if (!ret
&& ops
->read_write_emulate(vcpu
, gpa
, val
, bytes
))
4708 return X86EMUL_CONTINUE
;
4711 * Is this MMIO handled locally?
4713 handled
= ops
->read_write_mmio(vcpu
, gpa
, bytes
, val
);
4714 if (handled
== bytes
)
4715 return X86EMUL_CONTINUE
;
4721 WARN_ON(vcpu
->mmio_nr_fragments
>= KVM_MAX_MMIO_FRAGMENTS
);
4722 frag
= &vcpu
->mmio_fragments
[vcpu
->mmio_nr_fragments
++];
4726 return X86EMUL_CONTINUE
;
4729 static int emulator_read_write(struct x86_emulate_ctxt
*ctxt
,
4731 void *val
, unsigned int bytes
,
4732 struct x86_exception
*exception
,
4733 const struct read_write_emulator_ops
*ops
)
4735 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4739 if (ops
->read_write_prepare
&&
4740 ops
->read_write_prepare(vcpu
, val
, bytes
))
4741 return X86EMUL_CONTINUE
;
4743 vcpu
->mmio_nr_fragments
= 0;
4745 /* Crossing a page boundary? */
4746 if (((addr
+ bytes
- 1) ^ addr
) & PAGE_MASK
) {
4749 now
= -addr
& ~PAGE_MASK
;
4750 rc
= emulator_read_write_onepage(addr
, val
, now
, exception
,
4753 if (rc
!= X86EMUL_CONTINUE
)
4756 if (ctxt
->mode
!= X86EMUL_MODE_PROT64
)
4762 rc
= emulator_read_write_onepage(addr
, val
, bytes
, exception
,
4764 if (rc
!= X86EMUL_CONTINUE
)
4767 if (!vcpu
->mmio_nr_fragments
)
4770 gpa
= vcpu
->mmio_fragments
[0].gpa
;
4772 vcpu
->mmio_needed
= 1;
4773 vcpu
->mmio_cur_fragment
= 0;
4775 vcpu
->run
->mmio
.len
= min(8u, vcpu
->mmio_fragments
[0].len
);
4776 vcpu
->run
->mmio
.is_write
= vcpu
->mmio_is_write
= ops
->write
;
4777 vcpu
->run
->exit_reason
= KVM_EXIT_MMIO
;
4778 vcpu
->run
->mmio
.phys_addr
= gpa
;
4780 return ops
->read_write_exit_mmio(vcpu
, gpa
, val
, bytes
);
4783 static int emulator_read_emulated(struct x86_emulate_ctxt
*ctxt
,
4787 struct x86_exception
*exception
)
4789 return emulator_read_write(ctxt
, addr
, val
, bytes
,
4790 exception
, &read_emultor
);
4793 static int emulator_write_emulated(struct x86_emulate_ctxt
*ctxt
,
4797 struct x86_exception
*exception
)
4799 return emulator_read_write(ctxt
, addr
, (void *)val
, bytes
,
4800 exception
, &write_emultor
);
4803 #define CMPXCHG_TYPE(t, ptr, old, new) \
4804 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
4806 #ifdef CONFIG_X86_64
4807 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
4809 # define CMPXCHG64(ptr, old, new) \
4810 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
4813 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt
*ctxt
,
4818 struct x86_exception
*exception
)
4820 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4826 /* guests cmpxchg8b have to be emulated atomically */
4827 if (bytes
> 8 || (bytes
& (bytes
- 1)))
4830 gpa
= kvm_mmu_gva_to_gpa_write(vcpu
, addr
, NULL
);
4832 if (gpa
== UNMAPPED_GVA
||
4833 (gpa
& PAGE_MASK
) == APIC_DEFAULT_PHYS_BASE
)
4836 if (((gpa
+ bytes
- 1) & PAGE_MASK
) != (gpa
& PAGE_MASK
))
4839 page
= kvm_vcpu_gfn_to_page(vcpu
, gpa
>> PAGE_SHIFT
);
4840 if (is_error_page(page
))
4843 kaddr
= kmap_atomic(page
);
4844 kaddr
+= offset_in_page(gpa
);
4847 exchanged
= CMPXCHG_TYPE(u8
, kaddr
, old
, new);
4850 exchanged
= CMPXCHG_TYPE(u16
, kaddr
, old
, new);
4853 exchanged
= CMPXCHG_TYPE(u32
, kaddr
, old
, new);
4856 exchanged
= CMPXCHG64(kaddr
, old
, new);
4861 kunmap_atomic(kaddr
);
4862 kvm_release_page_dirty(page
);
4865 return X86EMUL_CMPXCHG_FAILED
;
4867 kvm_vcpu_mark_page_dirty(vcpu
, gpa
>> PAGE_SHIFT
);
4868 kvm_page_track_write(vcpu
, gpa
, new, bytes
);
4870 return X86EMUL_CONTINUE
;
4873 printk_once(KERN_WARNING
"kvm: emulating exchange as write\n");
4875 return emulator_write_emulated(ctxt
, addr
, new, bytes
, exception
);
4878 static int kernel_pio(struct kvm_vcpu
*vcpu
, void *pd
)
4882 for (i
= 0; i
< vcpu
->arch
.pio
.count
; i
++) {
4883 if (vcpu
->arch
.pio
.in
)
4884 r
= kvm_io_bus_read(vcpu
, KVM_PIO_BUS
, vcpu
->arch
.pio
.port
,
4885 vcpu
->arch
.pio
.size
, pd
);
4887 r
= kvm_io_bus_write(vcpu
, KVM_PIO_BUS
,
4888 vcpu
->arch
.pio
.port
, vcpu
->arch
.pio
.size
,
4892 pd
+= vcpu
->arch
.pio
.size
;
4897 static int emulator_pio_in_out(struct kvm_vcpu
*vcpu
, int size
,
4898 unsigned short port
, void *val
,
4899 unsigned int count
, bool in
)
4901 vcpu
->arch
.pio
.port
= port
;
4902 vcpu
->arch
.pio
.in
= in
;
4903 vcpu
->arch
.pio
.count
= count
;
4904 vcpu
->arch
.pio
.size
= size
;
4906 if (!kernel_pio(vcpu
, vcpu
->arch
.pio_data
)) {
4907 vcpu
->arch
.pio
.count
= 0;
4911 vcpu
->run
->exit_reason
= KVM_EXIT_IO
;
4912 vcpu
->run
->io
.direction
= in
? KVM_EXIT_IO_IN
: KVM_EXIT_IO_OUT
;
4913 vcpu
->run
->io
.size
= size
;
4914 vcpu
->run
->io
.data_offset
= KVM_PIO_PAGE_OFFSET
* PAGE_SIZE
;
4915 vcpu
->run
->io
.count
= count
;
4916 vcpu
->run
->io
.port
= port
;
4921 static int emulator_pio_in_emulated(struct x86_emulate_ctxt
*ctxt
,
4922 int size
, unsigned short port
, void *val
,
4925 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4928 if (vcpu
->arch
.pio
.count
)
4931 memset(vcpu
->arch
.pio_data
, 0, size
* count
);
4933 ret
= emulator_pio_in_out(vcpu
, size
, port
, val
, count
, true);
4936 memcpy(val
, vcpu
->arch
.pio_data
, size
* count
);
4937 trace_kvm_pio(KVM_PIO_IN
, port
, size
, count
, vcpu
->arch
.pio_data
);
4938 vcpu
->arch
.pio
.count
= 0;
4945 static int emulator_pio_out_emulated(struct x86_emulate_ctxt
*ctxt
,
4946 int size
, unsigned short port
,
4947 const void *val
, unsigned int count
)
4949 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4951 memcpy(vcpu
->arch
.pio_data
, val
, size
* count
);
4952 trace_kvm_pio(KVM_PIO_OUT
, port
, size
, count
, vcpu
->arch
.pio_data
);
4953 return emulator_pio_in_out(vcpu
, size
, port
, (void *)val
, count
, false);
4956 static unsigned long get_segment_base(struct kvm_vcpu
*vcpu
, int seg
)
4958 return kvm_x86_ops
->get_segment_base(vcpu
, seg
);
4961 static void emulator_invlpg(struct x86_emulate_ctxt
*ctxt
, ulong address
)
4963 kvm_mmu_invlpg(emul_to_vcpu(ctxt
), address
);
4966 static int kvm_emulate_wbinvd_noskip(struct kvm_vcpu
*vcpu
)
4968 if (!need_emulate_wbinvd(vcpu
))
4969 return X86EMUL_CONTINUE
;
4971 if (kvm_x86_ops
->has_wbinvd_exit()) {
4972 int cpu
= get_cpu();
4974 cpumask_set_cpu(cpu
, vcpu
->arch
.wbinvd_dirty_mask
);
4975 smp_call_function_many(vcpu
->arch
.wbinvd_dirty_mask
,
4976 wbinvd_ipi
, NULL
, 1);
4978 cpumask_clear(vcpu
->arch
.wbinvd_dirty_mask
);
4981 return X86EMUL_CONTINUE
;
4984 int kvm_emulate_wbinvd(struct kvm_vcpu
*vcpu
)
4986 kvm_emulate_wbinvd_noskip(vcpu
);
4987 return kvm_skip_emulated_instruction(vcpu
);
4989 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd
);
4993 static void emulator_wbinvd(struct x86_emulate_ctxt
*ctxt
)
4995 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt
));
4998 static int emulator_get_dr(struct x86_emulate_ctxt
*ctxt
, int dr
,
4999 unsigned long *dest
)
5001 return kvm_get_dr(emul_to_vcpu(ctxt
), dr
, dest
);
5004 static int emulator_set_dr(struct x86_emulate_ctxt
*ctxt
, int dr
,
5005 unsigned long value
)
5008 return __kvm_set_dr(emul_to_vcpu(ctxt
), dr
, value
);
5011 static u64
mk_cr_64(u64 curr_cr
, u32 new_val
)
5013 return (curr_cr
& ~((1ULL << 32) - 1)) | new_val
;
5016 static unsigned long emulator_get_cr(struct x86_emulate_ctxt
*ctxt
, int cr
)
5018 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5019 unsigned long value
;
5023 value
= kvm_read_cr0(vcpu
);
5026 value
= vcpu
->arch
.cr2
;
5029 value
= kvm_read_cr3(vcpu
);
5032 value
= kvm_read_cr4(vcpu
);
5035 value
= kvm_get_cr8(vcpu
);
5038 kvm_err("%s: unexpected cr %u\n", __func__
, cr
);
5045 static int emulator_set_cr(struct x86_emulate_ctxt
*ctxt
, int cr
, ulong val
)
5047 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5052 res
= kvm_set_cr0(vcpu
, mk_cr_64(kvm_read_cr0(vcpu
), val
));
5055 vcpu
->arch
.cr2
= val
;
5058 res
= kvm_set_cr3(vcpu
, val
);
5061 res
= kvm_set_cr4(vcpu
, mk_cr_64(kvm_read_cr4(vcpu
), val
));
5064 res
= kvm_set_cr8(vcpu
, val
);
5067 kvm_err("%s: unexpected cr %u\n", __func__
, cr
);
5074 static int emulator_get_cpl(struct x86_emulate_ctxt
*ctxt
)
5076 return kvm_x86_ops
->get_cpl(emul_to_vcpu(ctxt
));
5079 static void emulator_get_gdt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
5081 kvm_x86_ops
->get_gdt(emul_to_vcpu(ctxt
), dt
);
5084 static void emulator_get_idt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
5086 kvm_x86_ops
->get_idt(emul_to_vcpu(ctxt
), dt
);
5089 static void emulator_set_gdt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
5091 kvm_x86_ops
->set_gdt(emul_to_vcpu(ctxt
), dt
);
5094 static void emulator_set_idt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
5096 kvm_x86_ops
->set_idt(emul_to_vcpu(ctxt
), dt
);
5099 static unsigned long emulator_get_cached_segment_base(
5100 struct x86_emulate_ctxt
*ctxt
, int seg
)
5102 return get_segment_base(emul_to_vcpu(ctxt
), seg
);
5105 static bool emulator_get_segment(struct x86_emulate_ctxt
*ctxt
, u16
*selector
,
5106 struct desc_struct
*desc
, u32
*base3
,
5109 struct kvm_segment var
;
5111 kvm_get_segment(emul_to_vcpu(ctxt
), &var
, seg
);
5112 *selector
= var
.selector
;
5115 memset(desc
, 0, sizeof(*desc
));
5123 set_desc_limit(desc
, var
.limit
);
5124 set_desc_base(desc
, (unsigned long)var
.base
);
5125 #ifdef CONFIG_X86_64
5127 *base3
= var
.base
>> 32;
5129 desc
->type
= var
.type
;
5131 desc
->dpl
= var
.dpl
;
5132 desc
->p
= var
.present
;
5133 desc
->avl
= var
.avl
;
5141 static void emulator_set_segment(struct x86_emulate_ctxt
*ctxt
, u16 selector
,
5142 struct desc_struct
*desc
, u32 base3
,
5145 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5146 struct kvm_segment var
;
5148 var
.selector
= selector
;
5149 var
.base
= get_desc_base(desc
);
5150 #ifdef CONFIG_X86_64
5151 var
.base
|= ((u64
)base3
) << 32;
5153 var
.limit
= get_desc_limit(desc
);
5155 var
.limit
= (var
.limit
<< 12) | 0xfff;
5156 var
.type
= desc
->type
;
5157 var
.dpl
= desc
->dpl
;
5162 var
.avl
= desc
->avl
;
5163 var
.present
= desc
->p
;
5164 var
.unusable
= !var
.present
;
5167 kvm_set_segment(vcpu
, &var
, seg
);
5171 static int emulator_get_msr(struct x86_emulate_ctxt
*ctxt
,
5172 u32 msr_index
, u64
*pdata
)
5174 struct msr_data msr
;
5177 msr
.index
= msr_index
;
5178 msr
.host_initiated
= false;
5179 r
= kvm_get_msr(emul_to_vcpu(ctxt
), &msr
);
5187 static int emulator_set_msr(struct x86_emulate_ctxt
*ctxt
,
5188 u32 msr_index
, u64 data
)
5190 struct msr_data msr
;
5193 msr
.index
= msr_index
;
5194 msr
.host_initiated
= false;
5195 return kvm_set_msr(emul_to_vcpu(ctxt
), &msr
);
5198 static u64
emulator_get_smbase(struct x86_emulate_ctxt
*ctxt
)
5200 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5202 return vcpu
->arch
.smbase
;
5205 static void emulator_set_smbase(struct x86_emulate_ctxt
*ctxt
, u64 smbase
)
5207 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5209 vcpu
->arch
.smbase
= smbase
;
5212 static int emulator_check_pmc(struct x86_emulate_ctxt
*ctxt
,
5215 return kvm_pmu_is_valid_msr_idx(emul_to_vcpu(ctxt
), pmc
);
5218 static int emulator_read_pmc(struct x86_emulate_ctxt
*ctxt
,
5219 u32 pmc
, u64
*pdata
)
5221 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt
), pmc
, pdata
);
5224 static void emulator_halt(struct x86_emulate_ctxt
*ctxt
)
5226 emul_to_vcpu(ctxt
)->arch
.halt_request
= 1;
5229 static void emulator_get_fpu(struct x86_emulate_ctxt
*ctxt
)
5232 kvm_load_guest_fpu(emul_to_vcpu(ctxt
));
5235 static void emulator_put_fpu(struct x86_emulate_ctxt
*ctxt
)
5240 static int emulator_intercept(struct x86_emulate_ctxt
*ctxt
,
5241 struct x86_instruction_info
*info
,
5242 enum x86_intercept_stage stage
)
5244 return kvm_x86_ops
->check_intercept(emul_to_vcpu(ctxt
), info
, stage
);
5247 static bool emulator_get_cpuid(struct x86_emulate_ctxt
*ctxt
,
5248 u32
*eax
, u32
*ebx
, u32
*ecx
, u32
*edx
, bool check_limit
)
5250 return kvm_cpuid(emul_to_vcpu(ctxt
), eax
, ebx
, ecx
, edx
, check_limit
);
5253 static ulong
emulator_read_gpr(struct x86_emulate_ctxt
*ctxt
, unsigned reg
)
5255 return kvm_register_read(emul_to_vcpu(ctxt
), reg
);
5258 static void emulator_write_gpr(struct x86_emulate_ctxt
*ctxt
, unsigned reg
, ulong val
)
5260 kvm_register_write(emul_to_vcpu(ctxt
), reg
, val
);
5263 static void emulator_set_nmi_mask(struct x86_emulate_ctxt
*ctxt
, bool masked
)
5265 kvm_x86_ops
->set_nmi_mask(emul_to_vcpu(ctxt
), masked
);
5268 static unsigned emulator_get_hflags(struct x86_emulate_ctxt
*ctxt
)
5270 return emul_to_vcpu(ctxt
)->arch
.hflags
;
5273 static void emulator_set_hflags(struct x86_emulate_ctxt
*ctxt
, unsigned emul_flags
)
5275 kvm_set_hflags(emul_to_vcpu(ctxt
), emul_flags
);
5278 static const struct x86_emulate_ops emulate_ops
= {
5279 .read_gpr
= emulator_read_gpr
,
5280 .write_gpr
= emulator_write_gpr
,
5281 .read_std
= kvm_read_guest_virt_system
,
5282 .write_std
= kvm_write_guest_virt_system
,
5283 .read_phys
= kvm_read_guest_phys_system
,
5284 .fetch
= kvm_fetch_guest_virt
,
5285 .read_emulated
= emulator_read_emulated
,
5286 .write_emulated
= emulator_write_emulated
,
5287 .cmpxchg_emulated
= emulator_cmpxchg_emulated
,
5288 .invlpg
= emulator_invlpg
,
5289 .pio_in_emulated
= emulator_pio_in_emulated
,
5290 .pio_out_emulated
= emulator_pio_out_emulated
,
5291 .get_segment
= emulator_get_segment
,
5292 .set_segment
= emulator_set_segment
,
5293 .get_cached_segment_base
= emulator_get_cached_segment_base
,
5294 .get_gdt
= emulator_get_gdt
,
5295 .get_idt
= emulator_get_idt
,
5296 .set_gdt
= emulator_set_gdt
,
5297 .set_idt
= emulator_set_idt
,
5298 .get_cr
= emulator_get_cr
,
5299 .set_cr
= emulator_set_cr
,
5300 .cpl
= emulator_get_cpl
,
5301 .get_dr
= emulator_get_dr
,
5302 .set_dr
= emulator_set_dr
,
5303 .get_smbase
= emulator_get_smbase
,
5304 .set_smbase
= emulator_set_smbase
,
5305 .set_msr
= emulator_set_msr
,
5306 .get_msr
= emulator_get_msr
,
5307 .check_pmc
= emulator_check_pmc
,
5308 .read_pmc
= emulator_read_pmc
,
5309 .halt
= emulator_halt
,
5310 .wbinvd
= emulator_wbinvd
,
5311 .fix_hypercall
= emulator_fix_hypercall
,
5312 .get_fpu
= emulator_get_fpu
,
5313 .put_fpu
= emulator_put_fpu
,
5314 .intercept
= emulator_intercept
,
5315 .get_cpuid
= emulator_get_cpuid
,
5316 .set_nmi_mask
= emulator_set_nmi_mask
,
5317 .get_hflags
= emulator_get_hflags
,
5318 .set_hflags
= emulator_set_hflags
,
5321 static void toggle_interruptibility(struct kvm_vcpu
*vcpu
, u32 mask
)
5323 u32 int_shadow
= kvm_x86_ops
->get_interrupt_shadow(vcpu
);
5325 * an sti; sti; sequence only disable interrupts for the first
5326 * instruction. So, if the last instruction, be it emulated or
5327 * not, left the system with the INT_STI flag enabled, it
5328 * means that the last instruction is an sti. We should not
5329 * leave the flag on in this case. The same goes for mov ss
5331 if (int_shadow
& mask
)
5333 if (unlikely(int_shadow
|| mask
)) {
5334 kvm_x86_ops
->set_interrupt_shadow(vcpu
, mask
);
5336 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
5340 static bool inject_emulated_exception(struct kvm_vcpu
*vcpu
)
5342 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5343 if (ctxt
->exception
.vector
== PF_VECTOR
)
5344 return kvm_propagate_fault(vcpu
, &ctxt
->exception
);
5346 if (ctxt
->exception
.error_code_valid
)
5347 kvm_queue_exception_e(vcpu
, ctxt
->exception
.vector
,
5348 ctxt
->exception
.error_code
);
5350 kvm_queue_exception(vcpu
, ctxt
->exception
.vector
);
5354 static void init_emulate_ctxt(struct kvm_vcpu
*vcpu
)
5356 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5359 kvm_x86_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
5361 ctxt
->eflags
= kvm_get_rflags(vcpu
);
5362 ctxt
->tf
= (ctxt
->eflags
& X86_EFLAGS_TF
) != 0;
5364 ctxt
->eip
= kvm_rip_read(vcpu
);
5365 ctxt
->mode
= (!is_protmode(vcpu
)) ? X86EMUL_MODE_REAL
:
5366 (ctxt
->eflags
& X86_EFLAGS_VM
) ? X86EMUL_MODE_VM86
:
5367 (cs_l
&& is_long_mode(vcpu
)) ? X86EMUL_MODE_PROT64
:
5368 cs_db
? X86EMUL_MODE_PROT32
:
5369 X86EMUL_MODE_PROT16
;
5370 BUILD_BUG_ON(HF_GUEST_MASK
!= X86EMUL_GUEST_MASK
);
5371 BUILD_BUG_ON(HF_SMM_MASK
!= X86EMUL_SMM_MASK
);
5372 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK
!= X86EMUL_SMM_INSIDE_NMI_MASK
);
5374 init_decode_cache(ctxt
);
5375 vcpu
->arch
.emulate_regs_need_sync_from_vcpu
= false;
5378 int kvm_inject_realmode_interrupt(struct kvm_vcpu
*vcpu
, int irq
, int inc_eip
)
5380 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5383 init_emulate_ctxt(vcpu
);
5387 ctxt
->_eip
= ctxt
->eip
+ inc_eip
;
5388 ret
= emulate_int_real(ctxt
, irq
);
5390 if (ret
!= X86EMUL_CONTINUE
)
5391 return EMULATE_FAIL
;
5393 ctxt
->eip
= ctxt
->_eip
;
5394 kvm_rip_write(vcpu
, ctxt
->eip
);
5395 kvm_set_rflags(vcpu
, ctxt
->eflags
);
5397 if (irq
== NMI_VECTOR
)
5398 vcpu
->arch
.nmi_pending
= 0;
5400 vcpu
->arch
.interrupt
.pending
= false;
5402 return EMULATE_DONE
;
5404 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt
);
5406 static int handle_emulation_failure(struct kvm_vcpu
*vcpu
)
5408 int r
= EMULATE_DONE
;
5410 ++vcpu
->stat
.insn_emulation_fail
;
5411 trace_kvm_emulate_insn_failed(vcpu
);
5412 if (!is_guest_mode(vcpu
) && kvm_x86_ops
->get_cpl(vcpu
) == 0) {
5413 vcpu
->run
->exit_reason
= KVM_EXIT_INTERNAL_ERROR
;
5414 vcpu
->run
->internal
.suberror
= KVM_INTERNAL_ERROR_EMULATION
;
5415 vcpu
->run
->internal
.ndata
= 0;
5418 kvm_queue_exception(vcpu
, UD_VECTOR
);
5423 static bool reexecute_instruction(struct kvm_vcpu
*vcpu
, gva_t cr2
,
5424 bool write_fault_to_shadow_pgtable
,
5430 if (emulation_type
& EMULTYPE_NO_REEXECUTE
)
5433 if (!vcpu
->arch
.mmu
.direct_map
) {
5435 * Write permission should be allowed since only
5436 * write access need to be emulated.
5438 gpa
= kvm_mmu_gva_to_gpa_write(vcpu
, cr2
, NULL
);
5441 * If the mapping is invalid in guest, let cpu retry
5442 * it to generate fault.
5444 if (gpa
== UNMAPPED_GVA
)
5449 * Do not retry the unhandleable instruction if it faults on the
5450 * readonly host memory, otherwise it will goto a infinite loop:
5451 * retry instruction -> write #PF -> emulation fail -> retry
5452 * instruction -> ...
5454 pfn
= gfn_to_pfn(vcpu
->kvm
, gpa_to_gfn(gpa
));
5457 * If the instruction failed on the error pfn, it can not be fixed,
5458 * report the error to userspace.
5460 if (is_error_noslot_pfn(pfn
))
5463 kvm_release_pfn_clean(pfn
);
5465 /* The instructions are well-emulated on direct mmu. */
5466 if (vcpu
->arch
.mmu
.direct_map
) {
5467 unsigned int indirect_shadow_pages
;
5469 spin_lock(&vcpu
->kvm
->mmu_lock
);
5470 indirect_shadow_pages
= vcpu
->kvm
->arch
.indirect_shadow_pages
;
5471 spin_unlock(&vcpu
->kvm
->mmu_lock
);
5473 if (indirect_shadow_pages
)
5474 kvm_mmu_unprotect_page(vcpu
->kvm
, gpa_to_gfn(gpa
));
5480 * if emulation was due to access to shadowed page table
5481 * and it failed try to unshadow page and re-enter the
5482 * guest to let CPU execute the instruction.
5484 kvm_mmu_unprotect_page(vcpu
->kvm
, gpa_to_gfn(gpa
));
5487 * If the access faults on its page table, it can not
5488 * be fixed by unprotecting shadow page and it should
5489 * be reported to userspace.
5491 return !write_fault_to_shadow_pgtable
;
5494 static bool retry_instruction(struct x86_emulate_ctxt
*ctxt
,
5495 unsigned long cr2
, int emulation_type
)
5497 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5498 unsigned long last_retry_eip
, last_retry_addr
, gpa
= cr2
;
5500 last_retry_eip
= vcpu
->arch
.last_retry_eip
;
5501 last_retry_addr
= vcpu
->arch
.last_retry_addr
;
5504 * If the emulation is caused by #PF and it is non-page_table
5505 * writing instruction, it means the VM-EXIT is caused by shadow
5506 * page protected, we can zap the shadow page and retry this
5507 * instruction directly.
5509 * Note: if the guest uses a non-page-table modifying instruction
5510 * on the PDE that points to the instruction, then we will unmap
5511 * the instruction and go to an infinite loop. So, we cache the
5512 * last retried eip and the last fault address, if we meet the eip
5513 * and the address again, we can break out of the potential infinite
5516 vcpu
->arch
.last_retry_eip
= vcpu
->arch
.last_retry_addr
= 0;
5518 if (!(emulation_type
& EMULTYPE_RETRY
))
5521 if (x86_page_table_writing_insn(ctxt
))
5524 if (ctxt
->eip
== last_retry_eip
&& last_retry_addr
== cr2
)
5527 vcpu
->arch
.last_retry_eip
= ctxt
->eip
;
5528 vcpu
->arch
.last_retry_addr
= cr2
;
5530 if (!vcpu
->arch
.mmu
.direct_map
)
5531 gpa
= kvm_mmu_gva_to_gpa_write(vcpu
, cr2
, NULL
);
5533 kvm_mmu_unprotect_page(vcpu
->kvm
, gpa_to_gfn(gpa
));
5538 static int complete_emulated_mmio(struct kvm_vcpu
*vcpu
);
5539 static int complete_emulated_pio(struct kvm_vcpu
*vcpu
);
5541 static void kvm_smm_changed(struct kvm_vcpu
*vcpu
)
5543 if (!(vcpu
->arch
.hflags
& HF_SMM_MASK
)) {
5544 /* This is a good place to trace that we are exiting SMM. */
5545 trace_kvm_enter_smm(vcpu
->vcpu_id
, vcpu
->arch
.smbase
, false);
5547 /* Process a latched INIT or SMI, if any. */
5548 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
5551 kvm_mmu_reset_context(vcpu
);
5554 static void kvm_set_hflags(struct kvm_vcpu
*vcpu
, unsigned emul_flags
)
5556 unsigned changed
= vcpu
->arch
.hflags
^ emul_flags
;
5558 vcpu
->arch
.hflags
= emul_flags
;
5560 if (changed
& HF_SMM_MASK
)
5561 kvm_smm_changed(vcpu
);
5564 static int kvm_vcpu_check_hw_bp(unsigned long addr
, u32 type
, u32 dr7
,
5573 for (i
= 0; i
< 4; i
++, enable
>>= 2, rwlen
>>= 4)
5574 if ((enable
& 3) && (rwlen
& 15) == type
&& db
[i
] == addr
)
5579 static void kvm_vcpu_do_singlestep(struct kvm_vcpu
*vcpu
, int *r
)
5581 struct kvm_run
*kvm_run
= vcpu
->run
;
5583 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
) {
5584 kvm_run
->debug
.arch
.dr6
= DR6_BS
| DR6_FIXED_1
| DR6_RTM
;
5585 kvm_run
->debug
.arch
.pc
= vcpu
->arch
.singlestep_rip
;
5586 kvm_run
->debug
.arch
.exception
= DB_VECTOR
;
5587 kvm_run
->exit_reason
= KVM_EXIT_DEBUG
;
5588 *r
= EMULATE_USER_EXIT
;
5591 * "Certain debug exceptions may clear bit 0-3. The
5592 * remaining contents of the DR6 register are never
5593 * cleared by the processor".
5595 vcpu
->arch
.dr6
&= ~15;
5596 vcpu
->arch
.dr6
|= DR6_BS
| DR6_RTM
;
5597 kvm_queue_exception(vcpu
, DB_VECTOR
);
5601 int kvm_skip_emulated_instruction(struct kvm_vcpu
*vcpu
)
5603 unsigned long rflags
= kvm_x86_ops
->get_rflags(vcpu
);
5604 int r
= EMULATE_DONE
;
5606 kvm_x86_ops
->skip_emulated_instruction(vcpu
);
5609 * rflags is the old, "raw" value of the flags. The new value has
5610 * not been saved yet.
5612 * This is correct even for TF set by the guest, because "the
5613 * processor will not generate this exception after the instruction
5614 * that sets the TF flag".
5616 if (unlikely(rflags
& X86_EFLAGS_TF
))
5617 kvm_vcpu_do_singlestep(vcpu
, &r
);
5618 return r
== EMULATE_DONE
;
5620 EXPORT_SYMBOL_GPL(kvm_skip_emulated_instruction
);
5622 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu
*vcpu
, int *r
)
5624 if (unlikely(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
) &&
5625 (vcpu
->arch
.guest_debug_dr7
& DR7_BP_EN_MASK
)) {
5626 struct kvm_run
*kvm_run
= vcpu
->run
;
5627 unsigned long eip
= kvm_get_linear_rip(vcpu
);
5628 u32 dr6
= kvm_vcpu_check_hw_bp(eip
, 0,
5629 vcpu
->arch
.guest_debug_dr7
,
5633 kvm_run
->debug
.arch
.dr6
= dr6
| DR6_FIXED_1
| DR6_RTM
;
5634 kvm_run
->debug
.arch
.pc
= eip
;
5635 kvm_run
->debug
.arch
.exception
= DB_VECTOR
;
5636 kvm_run
->exit_reason
= KVM_EXIT_DEBUG
;
5637 *r
= EMULATE_USER_EXIT
;
5642 if (unlikely(vcpu
->arch
.dr7
& DR7_BP_EN_MASK
) &&
5643 !(kvm_get_rflags(vcpu
) & X86_EFLAGS_RF
)) {
5644 unsigned long eip
= kvm_get_linear_rip(vcpu
);
5645 u32 dr6
= kvm_vcpu_check_hw_bp(eip
, 0,
5650 vcpu
->arch
.dr6
&= ~15;
5651 vcpu
->arch
.dr6
|= dr6
| DR6_RTM
;
5652 kvm_queue_exception(vcpu
, DB_VECTOR
);
5661 int x86_emulate_instruction(struct kvm_vcpu
*vcpu
,
5668 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5669 bool writeback
= true;
5670 bool write_fault_to_spt
= vcpu
->arch
.write_fault_to_shadow_pgtable
;
5673 * Clear write_fault_to_shadow_pgtable here to ensure it is
5676 vcpu
->arch
.write_fault_to_shadow_pgtable
= false;
5677 kvm_clear_exception_queue(vcpu
);
5679 if (!(emulation_type
& EMULTYPE_NO_DECODE
)) {
5680 init_emulate_ctxt(vcpu
);
5683 * We will reenter on the same instruction since
5684 * we do not set complete_userspace_io. This does not
5685 * handle watchpoints yet, those would be handled in
5688 if (kvm_vcpu_check_breakpoint(vcpu
, &r
))
5691 ctxt
->interruptibility
= 0;
5692 ctxt
->have_exception
= false;
5693 ctxt
->exception
.vector
= -1;
5694 ctxt
->perm_ok
= false;
5696 ctxt
->ud
= emulation_type
& EMULTYPE_TRAP_UD
;
5698 r
= x86_decode_insn(ctxt
, insn
, insn_len
);
5700 trace_kvm_emulate_insn_start(vcpu
);
5701 ++vcpu
->stat
.insn_emulation
;
5702 if (r
!= EMULATION_OK
) {
5703 if (emulation_type
& EMULTYPE_TRAP_UD
)
5704 return EMULATE_FAIL
;
5705 if (reexecute_instruction(vcpu
, cr2
, write_fault_to_spt
,
5707 return EMULATE_DONE
;
5708 if (emulation_type
& EMULTYPE_SKIP
)
5709 return EMULATE_FAIL
;
5710 return handle_emulation_failure(vcpu
);
5714 if (emulation_type
& EMULTYPE_SKIP
) {
5715 kvm_rip_write(vcpu
, ctxt
->_eip
);
5716 if (ctxt
->eflags
& X86_EFLAGS_RF
)
5717 kvm_set_rflags(vcpu
, ctxt
->eflags
& ~X86_EFLAGS_RF
);
5718 return EMULATE_DONE
;
5721 if (retry_instruction(ctxt
, cr2
, emulation_type
))
5722 return EMULATE_DONE
;
5724 /* this is needed for vmware backdoor interface to work since it
5725 changes registers values during IO operation */
5726 if (vcpu
->arch
.emulate_regs_need_sync_from_vcpu
) {
5727 vcpu
->arch
.emulate_regs_need_sync_from_vcpu
= false;
5728 emulator_invalidate_register_cache(ctxt
);
5732 /* Save the faulting GPA (cr2) in the address field */
5733 ctxt
->exception
.address
= cr2
;
5735 r
= x86_emulate_insn(ctxt
);
5737 if (r
== EMULATION_INTERCEPTED
)
5738 return EMULATE_DONE
;
5740 if (r
== EMULATION_FAILED
) {
5741 if (reexecute_instruction(vcpu
, cr2
, write_fault_to_spt
,
5743 return EMULATE_DONE
;
5745 return handle_emulation_failure(vcpu
);
5748 if (ctxt
->have_exception
) {
5750 if (inject_emulated_exception(vcpu
))
5752 } else if (vcpu
->arch
.pio
.count
) {
5753 if (!vcpu
->arch
.pio
.in
) {
5754 /* FIXME: return into emulator if single-stepping. */
5755 vcpu
->arch
.pio
.count
= 0;
5758 vcpu
->arch
.complete_userspace_io
= complete_emulated_pio
;
5760 r
= EMULATE_USER_EXIT
;
5761 } else if (vcpu
->mmio_needed
) {
5762 if (!vcpu
->mmio_is_write
)
5764 r
= EMULATE_USER_EXIT
;
5765 vcpu
->arch
.complete_userspace_io
= complete_emulated_mmio
;
5766 } else if (r
== EMULATION_RESTART
)
5772 unsigned long rflags
= kvm_x86_ops
->get_rflags(vcpu
);
5773 toggle_interruptibility(vcpu
, ctxt
->interruptibility
);
5774 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= false;
5775 kvm_rip_write(vcpu
, ctxt
->eip
);
5776 if (r
== EMULATE_DONE
&&
5777 (ctxt
->tf
|| (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
)))
5778 kvm_vcpu_do_singlestep(vcpu
, &r
);
5779 if (!ctxt
->have_exception
||
5780 exception_type(ctxt
->exception
.vector
) == EXCPT_TRAP
)
5781 __kvm_set_rflags(vcpu
, ctxt
->eflags
);
5784 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
5785 * do nothing, and it will be requested again as soon as
5786 * the shadow expires. But we still need to check here,
5787 * because POPF has no interrupt shadow.
5789 if (unlikely((ctxt
->eflags
& ~rflags
) & X86_EFLAGS_IF
))
5790 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
5792 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= true;
5796 EXPORT_SYMBOL_GPL(x86_emulate_instruction
);
5798 int kvm_fast_pio_out(struct kvm_vcpu
*vcpu
, int size
, unsigned short port
)
5800 unsigned long val
= kvm_register_read(vcpu
, VCPU_REGS_RAX
);
5801 int ret
= emulator_pio_out_emulated(&vcpu
->arch
.emulate_ctxt
,
5802 size
, port
, &val
, 1);
5803 /* do not return to emulator after return from userspace */
5804 vcpu
->arch
.pio
.count
= 0;
5807 EXPORT_SYMBOL_GPL(kvm_fast_pio_out
);
5809 static int complete_fast_pio_in(struct kvm_vcpu
*vcpu
)
5813 /* We should only ever be called with arch.pio.count equal to 1 */
5814 BUG_ON(vcpu
->arch
.pio
.count
!= 1);
5816 /* For size less than 4 we merge, else we zero extend */
5817 val
= (vcpu
->arch
.pio
.size
< 4) ? kvm_register_read(vcpu
, VCPU_REGS_RAX
)
5821 * Since vcpu->arch.pio.count == 1 let emulator_pio_in_emulated perform
5822 * the copy and tracing
5824 emulator_pio_in_emulated(&vcpu
->arch
.emulate_ctxt
, vcpu
->arch
.pio
.size
,
5825 vcpu
->arch
.pio
.port
, &val
, 1);
5826 kvm_register_write(vcpu
, VCPU_REGS_RAX
, val
);
5831 int kvm_fast_pio_in(struct kvm_vcpu
*vcpu
, int size
, unsigned short port
)
5836 /* For size less than 4 we merge, else we zero extend */
5837 val
= (size
< 4) ? kvm_register_read(vcpu
, VCPU_REGS_RAX
) : 0;
5839 ret
= emulator_pio_in_emulated(&vcpu
->arch
.emulate_ctxt
, size
, port
,
5842 kvm_register_write(vcpu
, VCPU_REGS_RAX
, val
);
5846 vcpu
->arch
.complete_userspace_io
= complete_fast_pio_in
;
5850 EXPORT_SYMBOL_GPL(kvm_fast_pio_in
);
5852 static int kvmclock_cpu_down_prep(unsigned int cpu
)
5854 __this_cpu_write(cpu_tsc_khz
, 0);
5858 static void tsc_khz_changed(void *data
)
5860 struct cpufreq_freqs
*freq
= data
;
5861 unsigned long khz
= 0;
5865 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC
))
5866 khz
= cpufreq_quick_get(raw_smp_processor_id());
5869 __this_cpu_write(cpu_tsc_khz
, khz
);
5872 static int kvmclock_cpufreq_notifier(struct notifier_block
*nb
, unsigned long val
,
5875 struct cpufreq_freqs
*freq
= data
;
5877 struct kvm_vcpu
*vcpu
;
5878 int i
, send_ipi
= 0;
5881 * We allow guests to temporarily run on slowing clocks,
5882 * provided we notify them after, or to run on accelerating
5883 * clocks, provided we notify them before. Thus time never
5886 * However, we have a problem. We can't atomically update
5887 * the frequency of a given CPU from this function; it is
5888 * merely a notifier, which can be called from any CPU.
5889 * Changing the TSC frequency at arbitrary points in time
5890 * requires a recomputation of local variables related to
5891 * the TSC for each VCPU. We must flag these local variables
5892 * to be updated and be sure the update takes place with the
5893 * new frequency before any guests proceed.
5895 * Unfortunately, the combination of hotplug CPU and frequency
5896 * change creates an intractable locking scenario; the order
5897 * of when these callouts happen is undefined with respect to
5898 * CPU hotplug, and they can race with each other. As such,
5899 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
5900 * undefined; you can actually have a CPU frequency change take
5901 * place in between the computation of X and the setting of the
5902 * variable. To protect against this problem, all updates of
5903 * the per_cpu tsc_khz variable are done in an interrupt
5904 * protected IPI, and all callers wishing to update the value
5905 * must wait for a synchronous IPI to complete (which is trivial
5906 * if the caller is on the CPU already). This establishes the
5907 * necessary total order on variable updates.
5909 * Note that because a guest time update may take place
5910 * anytime after the setting of the VCPU's request bit, the
5911 * correct TSC value must be set before the request. However,
5912 * to ensure the update actually makes it to any guest which
5913 * starts running in hardware virtualization between the set
5914 * and the acquisition of the spinlock, we must also ping the
5915 * CPU after setting the request bit.
5919 if (val
== CPUFREQ_PRECHANGE
&& freq
->old
> freq
->new)
5921 if (val
== CPUFREQ_POSTCHANGE
&& freq
->old
< freq
->new)
5924 smp_call_function_single(freq
->cpu
, tsc_khz_changed
, freq
, 1);
5926 spin_lock(&kvm_lock
);
5927 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
5928 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
5929 if (vcpu
->cpu
!= freq
->cpu
)
5931 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
5932 if (vcpu
->cpu
!= smp_processor_id())
5936 spin_unlock(&kvm_lock
);
5938 if (freq
->old
< freq
->new && send_ipi
) {
5940 * We upscale the frequency. Must make the guest
5941 * doesn't see old kvmclock values while running with
5942 * the new frequency, otherwise we risk the guest sees
5943 * time go backwards.
5945 * In case we update the frequency for another cpu
5946 * (which might be in guest context) send an interrupt
5947 * to kick the cpu out of guest context. Next time
5948 * guest context is entered kvmclock will be updated,
5949 * so the guest will not see stale values.
5951 smp_call_function_single(freq
->cpu
, tsc_khz_changed
, freq
, 1);
5956 static struct notifier_block kvmclock_cpufreq_notifier_block
= {
5957 .notifier_call
= kvmclock_cpufreq_notifier
5960 static int kvmclock_cpu_online(unsigned int cpu
)
5962 tsc_khz_changed(NULL
);
5966 static void kvm_timer_init(void)
5968 max_tsc_khz
= tsc_khz
;
5970 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC
)) {
5971 #ifdef CONFIG_CPU_FREQ
5972 struct cpufreq_policy policy
;
5975 memset(&policy
, 0, sizeof(policy
));
5977 cpufreq_get_policy(&policy
, cpu
);
5978 if (policy
.cpuinfo
.max_freq
)
5979 max_tsc_khz
= policy
.cpuinfo
.max_freq
;
5982 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block
,
5983 CPUFREQ_TRANSITION_NOTIFIER
);
5985 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz
);
5987 cpuhp_setup_state(CPUHP_AP_X86_KVM_CLK_ONLINE
, "x86/kvm/clk:online",
5988 kvmclock_cpu_online
, kvmclock_cpu_down_prep
);
5991 static DEFINE_PER_CPU(struct kvm_vcpu
*, current_vcpu
);
5993 int kvm_is_in_guest(void)
5995 return __this_cpu_read(current_vcpu
) != NULL
;
5998 static int kvm_is_user_mode(void)
6002 if (__this_cpu_read(current_vcpu
))
6003 user_mode
= kvm_x86_ops
->get_cpl(__this_cpu_read(current_vcpu
));
6005 return user_mode
!= 0;
6008 static unsigned long kvm_get_guest_ip(void)
6010 unsigned long ip
= 0;
6012 if (__this_cpu_read(current_vcpu
))
6013 ip
= kvm_rip_read(__this_cpu_read(current_vcpu
));
6018 static struct perf_guest_info_callbacks kvm_guest_cbs
= {
6019 .is_in_guest
= kvm_is_in_guest
,
6020 .is_user_mode
= kvm_is_user_mode
,
6021 .get_guest_ip
= kvm_get_guest_ip
,
6024 void kvm_before_handle_nmi(struct kvm_vcpu
*vcpu
)
6026 __this_cpu_write(current_vcpu
, vcpu
);
6028 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi
);
6030 void kvm_after_handle_nmi(struct kvm_vcpu
*vcpu
)
6032 __this_cpu_write(current_vcpu
, NULL
);
6034 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi
);
6036 static void kvm_set_mmio_spte_mask(void)
6039 int maxphyaddr
= boot_cpu_data
.x86_phys_bits
;
6042 * Set the reserved bits and the present bit of an paging-structure
6043 * entry to generate page fault with PFER.RSV = 1.
6045 /* Mask the reserved physical address bits. */
6046 mask
= rsvd_bits(maxphyaddr
, 51);
6048 /* Set the present bit. */
6051 #ifdef CONFIG_X86_64
6053 * If reserved bit is not supported, clear the present bit to disable
6056 if (maxphyaddr
== 52)
6060 kvm_mmu_set_mmio_spte_mask(mask
, mask
);
6063 #ifdef CONFIG_X86_64
6064 static void pvclock_gtod_update_fn(struct work_struct
*work
)
6068 struct kvm_vcpu
*vcpu
;
6071 spin_lock(&kvm_lock
);
6072 list_for_each_entry(kvm
, &vm_list
, vm_list
)
6073 kvm_for_each_vcpu(i
, vcpu
, kvm
)
6074 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
6075 atomic_set(&kvm_guest_has_master_clock
, 0);
6076 spin_unlock(&kvm_lock
);
6079 static DECLARE_WORK(pvclock_gtod_work
, pvclock_gtod_update_fn
);
6082 * Notification about pvclock gtod data update.
6084 static int pvclock_gtod_notify(struct notifier_block
*nb
, unsigned long unused
,
6087 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
6088 struct timekeeper
*tk
= priv
;
6090 update_pvclock_gtod(tk
);
6092 /* disable master clock if host does not trust, or does not
6093 * use, TSC clocksource
6095 if (gtod
->clock
.vclock_mode
!= VCLOCK_TSC
&&
6096 atomic_read(&kvm_guest_has_master_clock
) != 0)
6097 queue_work(system_long_wq
, &pvclock_gtod_work
);
6102 static struct notifier_block pvclock_gtod_notifier
= {
6103 .notifier_call
= pvclock_gtod_notify
,
6107 int kvm_arch_init(void *opaque
)
6110 struct kvm_x86_ops
*ops
= opaque
;
6113 printk(KERN_ERR
"kvm: already loaded the other module\n");
6118 if (!ops
->cpu_has_kvm_support()) {
6119 printk(KERN_ERR
"kvm: no hardware support\n");
6123 if (ops
->disabled_by_bios()) {
6124 printk(KERN_ERR
"kvm: disabled by bios\n");
6130 shared_msrs
= alloc_percpu(struct kvm_shared_msrs
);
6132 printk(KERN_ERR
"kvm: failed to allocate percpu kvm_shared_msrs\n");
6136 r
= kvm_mmu_module_init();
6138 goto out_free_percpu
;
6140 kvm_set_mmio_spte_mask();
6144 kvm_mmu_set_mask_ptes(PT_USER_MASK
, PT_ACCESSED_MASK
,
6145 PT_DIRTY_MASK
, PT64_NX_MASK
, 0,
6146 PT_PRESENT_MASK
, 0, sme_me_mask
);
6149 perf_register_guest_info_callbacks(&kvm_guest_cbs
);
6151 if (boot_cpu_has(X86_FEATURE_XSAVE
))
6152 host_xcr0
= xgetbv(XCR_XFEATURE_ENABLED_MASK
);
6155 #ifdef CONFIG_X86_64
6156 pvclock_gtod_register_notifier(&pvclock_gtod_notifier
);
6162 free_percpu(shared_msrs
);
6167 void kvm_arch_exit(void)
6170 perf_unregister_guest_info_callbacks(&kvm_guest_cbs
);
6172 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC
))
6173 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block
,
6174 CPUFREQ_TRANSITION_NOTIFIER
);
6175 cpuhp_remove_state_nocalls(CPUHP_AP_X86_KVM_CLK_ONLINE
);
6176 #ifdef CONFIG_X86_64
6177 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier
);
6180 kvm_mmu_module_exit();
6181 free_percpu(shared_msrs
);
6184 int kvm_vcpu_halt(struct kvm_vcpu
*vcpu
)
6186 ++vcpu
->stat
.halt_exits
;
6187 if (lapic_in_kernel(vcpu
)) {
6188 vcpu
->arch
.mp_state
= KVM_MP_STATE_HALTED
;
6191 vcpu
->run
->exit_reason
= KVM_EXIT_HLT
;
6195 EXPORT_SYMBOL_GPL(kvm_vcpu_halt
);
6197 int kvm_emulate_halt(struct kvm_vcpu
*vcpu
)
6199 int ret
= kvm_skip_emulated_instruction(vcpu
);
6201 * TODO: we might be squashing a GUESTDBG_SINGLESTEP-triggered
6202 * KVM_EXIT_DEBUG here.
6204 return kvm_vcpu_halt(vcpu
) && ret
;
6206 EXPORT_SYMBOL_GPL(kvm_emulate_halt
);
6208 #ifdef CONFIG_X86_64
6209 static int kvm_pv_clock_pairing(struct kvm_vcpu
*vcpu
, gpa_t paddr
,
6210 unsigned long clock_type
)
6212 struct kvm_clock_pairing clock_pairing
;
6217 if (clock_type
!= KVM_CLOCK_PAIRING_WALLCLOCK
)
6218 return -KVM_EOPNOTSUPP
;
6220 if (kvm_get_walltime_and_clockread(&ts
, &cycle
) == false)
6221 return -KVM_EOPNOTSUPP
;
6223 clock_pairing
.sec
= ts
.tv_sec
;
6224 clock_pairing
.nsec
= ts
.tv_nsec
;
6225 clock_pairing
.tsc
= kvm_read_l1_tsc(vcpu
, cycle
);
6226 clock_pairing
.flags
= 0;
6229 if (kvm_write_guest(vcpu
->kvm
, paddr
, &clock_pairing
,
6230 sizeof(struct kvm_clock_pairing
)))
6238 * kvm_pv_kick_cpu_op: Kick a vcpu.
6240 * @apicid - apicid of vcpu to be kicked.
6242 static void kvm_pv_kick_cpu_op(struct kvm
*kvm
, unsigned long flags
, int apicid
)
6244 struct kvm_lapic_irq lapic_irq
;
6246 lapic_irq
.shorthand
= 0;
6247 lapic_irq
.dest_mode
= 0;
6248 lapic_irq
.level
= 0;
6249 lapic_irq
.dest_id
= apicid
;
6250 lapic_irq
.msi_redir_hint
= false;
6252 lapic_irq
.delivery_mode
= APIC_DM_REMRD
;
6253 kvm_irq_delivery_to_apic(kvm
, NULL
, &lapic_irq
, NULL
);
6256 void kvm_vcpu_deactivate_apicv(struct kvm_vcpu
*vcpu
)
6258 vcpu
->arch
.apicv_active
= false;
6259 kvm_x86_ops
->refresh_apicv_exec_ctrl(vcpu
);
6262 int kvm_emulate_hypercall(struct kvm_vcpu
*vcpu
)
6264 unsigned long nr
, a0
, a1
, a2
, a3
, ret
;
6267 r
= kvm_skip_emulated_instruction(vcpu
);
6269 if (kvm_hv_hypercall_enabled(vcpu
->kvm
))
6270 return kvm_hv_hypercall(vcpu
);
6272 nr
= kvm_register_read(vcpu
, VCPU_REGS_RAX
);
6273 a0
= kvm_register_read(vcpu
, VCPU_REGS_RBX
);
6274 a1
= kvm_register_read(vcpu
, VCPU_REGS_RCX
);
6275 a2
= kvm_register_read(vcpu
, VCPU_REGS_RDX
);
6276 a3
= kvm_register_read(vcpu
, VCPU_REGS_RSI
);
6278 trace_kvm_hypercall(nr
, a0
, a1
, a2
, a3
);
6280 op_64_bit
= is_64_bit_mode(vcpu
);
6289 if (kvm_x86_ops
->get_cpl(vcpu
) != 0) {
6295 case KVM_HC_VAPIC_POLL_IRQ
:
6298 case KVM_HC_KICK_CPU
:
6299 kvm_pv_kick_cpu_op(vcpu
->kvm
, a0
, a1
);
6302 #ifdef CONFIG_X86_64
6303 case KVM_HC_CLOCK_PAIRING
:
6304 ret
= kvm_pv_clock_pairing(vcpu
, a0
, a1
);
6314 kvm_register_write(vcpu
, VCPU_REGS_RAX
, ret
);
6315 ++vcpu
->stat
.hypercalls
;
6318 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall
);
6320 static int emulator_fix_hypercall(struct x86_emulate_ctxt
*ctxt
)
6322 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
6323 char instruction
[3];
6324 unsigned long rip
= kvm_rip_read(vcpu
);
6326 kvm_x86_ops
->patch_hypercall(vcpu
, instruction
);
6328 return emulator_write_emulated(ctxt
, rip
, instruction
, 3,
6332 static int dm_request_for_irq_injection(struct kvm_vcpu
*vcpu
)
6334 return vcpu
->run
->request_interrupt_window
&&
6335 likely(!pic_in_kernel(vcpu
->kvm
));
6338 static void post_kvm_run_save(struct kvm_vcpu
*vcpu
)
6340 struct kvm_run
*kvm_run
= vcpu
->run
;
6342 kvm_run
->if_flag
= (kvm_get_rflags(vcpu
) & X86_EFLAGS_IF
) != 0;
6343 kvm_run
->flags
= is_smm(vcpu
) ? KVM_RUN_X86_SMM
: 0;
6344 kvm_run
->cr8
= kvm_get_cr8(vcpu
);
6345 kvm_run
->apic_base
= kvm_get_apic_base(vcpu
);
6346 kvm_run
->ready_for_interrupt_injection
=
6347 pic_in_kernel(vcpu
->kvm
) ||
6348 kvm_vcpu_ready_for_interrupt_injection(vcpu
);
6351 static void update_cr8_intercept(struct kvm_vcpu
*vcpu
)
6355 if (!kvm_x86_ops
->update_cr8_intercept
)
6358 if (!lapic_in_kernel(vcpu
))
6361 if (vcpu
->arch
.apicv_active
)
6364 if (!vcpu
->arch
.apic
->vapic_addr
)
6365 max_irr
= kvm_lapic_find_highest_irr(vcpu
);
6372 tpr
= kvm_lapic_get_cr8(vcpu
);
6374 kvm_x86_ops
->update_cr8_intercept(vcpu
, tpr
, max_irr
);
6377 static int inject_pending_event(struct kvm_vcpu
*vcpu
, bool req_int_win
)
6381 /* try to reinject previous events if any */
6382 if (vcpu
->arch
.exception
.injected
) {
6383 kvm_x86_ops
->queue_exception(vcpu
);
6388 * Exceptions must be injected immediately, or the exception
6389 * frame will have the address of the NMI or interrupt handler.
6391 if (!vcpu
->arch
.exception
.pending
) {
6392 if (vcpu
->arch
.nmi_injected
) {
6393 kvm_x86_ops
->set_nmi(vcpu
);
6397 if (vcpu
->arch
.interrupt
.pending
) {
6398 kvm_x86_ops
->set_irq(vcpu
);
6403 if (is_guest_mode(vcpu
) && kvm_x86_ops
->check_nested_events
) {
6404 r
= kvm_x86_ops
->check_nested_events(vcpu
, req_int_win
);
6409 /* try to inject new event if pending */
6410 if (vcpu
->arch
.exception
.pending
) {
6411 trace_kvm_inj_exception(vcpu
->arch
.exception
.nr
,
6412 vcpu
->arch
.exception
.has_error_code
,
6413 vcpu
->arch
.exception
.error_code
);
6415 vcpu
->arch
.exception
.pending
= false;
6416 vcpu
->arch
.exception
.injected
= true;
6418 if (exception_type(vcpu
->arch
.exception
.nr
) == EXCPT_FAULT
)
6419 __kvm_set_rflags(vcpu
, kvm_get_rflags(vcpu
) |
6422 if (vcpu
->arch
.exception
.nr
== DB_VECTOR
&&
6423 (vcpu
->arch
.dr7
& DR7_GD
)) {
6424 vcpu
->arch
.dr7
&= ~DR7_GD
;
6425 kvm_update_dr7(vcpu
);
6428 kvm_x86_ops
->queue_exception(vcpu
);
6429 } else if (vcpu
->arch
.smi_pending
&& !is_smm(vcpu
)) {
6430 vcpu
->arch
.smi_pending
= false;
6432 } else if (vcpu
->arch
.nmi_pending
&& kvm_x86_ops
->nmi_allowed(vcpu
)) {
6433 --vcpu
->arch
.nmi_pending
;
6434 vcpu
->arch
.nmi_injected
= true;
6435 kvm_x86_ops
->set_nmi(vcpu
);
6436 } else if (kvm_cpu_has_injectable_intr(vcpu
)) {
6438 * Because interrupts can be injected asynchronously, we are
6439 * calling check_nested_events again here to avoid a race condition.
6440 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this
6441 * proposal and current concerns. Perhaps we should be setting
6442 * KVM_REQ_EVENT only on certain events and not unconditionally?
6444 if (is_guest_mode(vcpu
) && kvm_x86_ops
->check_nested_events
) {
6445 r
= kvm_x86_ops
->check_nested_events(vcpu
, req_int_win
);
6449 if (kvm_x86_ops
->interrupt_allowed(vcpu
)) {
6450 kvm_queue_interrupt(vcpu
, kvm_cpu_get_interrupt(vcpu
),
6452 kvm_x86_ops
->set_irq(vcpu
);
6459 static void process_nmi(struct kvm_vcpu
*vcpu
)
6464 * x86 is limited to one NMI running, and one NMI pending after it.
6465 * If an NMI is already in progress, limit further NMIs to just one.
6466 * Otherwise, allow two (and we'll inject the first one immediately).
6468 if (kvm_x86_ops
->get_nmi_mask(vcpu
) || vcpu
->arch
.nmi_injected
)
6471 vcpu
->arch
.nmi_pending
+= atomic_xchg(&vcpu
->arch
.nmi_queued
, 0);
6472 vcpu
->arch
.nmi_pending
= min(vcpu
->arch
.nmi_pending
, limit
);
6473 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
6476 #define put_smstate(type, buf, offset, val) \
6477 *(type *)((buf) + (offset) - 0x7e00) = val
6479 static u32
enter_smm_get_segment_flags(struct kvm_segment
*seg
)
6482 flags
|= seg
->g
<< 23;
6483 flags
|= seg
->db
<< 22;
6484 flags
|= seg
->l
<< 21;
6485 flags
|= seg
->avl
<< 20;
6486 flags
|= seg
->present
<< 15;
6487 flags
|= seg
->dpl
<< 13;
6488 flags
|= seg
->s
<< 12;
6489 flags
|= seg
->type
<< 8;
6493 static void enter_smm_save_seg_32(struct kvm_vcpu
*vcpu
, char *buf
, int n
)
6495 struct kvm_segment seg
;
6498 kvm_get_segment(vcpu
, &seg
, n
);
6499 put_smstate(u32
, buf
, 0x7fa8 + n
* 4, seg
.selector
);
6502 offset
= 0x7f84 + n
* 12;
6504 offset
= 0x7f2c + (n
- 3) * 12;
6506 put_smstate(u32
, buf
, offset
+ 8, seg
.base
);
6507 put_smstate(u32
, buf
, offset
+ 4, seg
.limit
);
6508 put_smstate(u32
, buf
, offset
, enter_smm_get_segment_flags(&seg
));
6511 #ifdef CONFIG_X86_64
6512 static void enter_smm_save_seg_64(struct kvm_vcpu
*vcpu
, char *buf
, int n
)
6514 struct kvm_segment seg
;
6518 kvm_get_segment(vcpu
, &seg
, n
);
6519 offset
= 0x7e00 + n
* 16;
6521 flags
= enter_smm_get_segment_flags(&seg
) >> 8;
6522 put_smstate(u16
, buf
, offset
, seg
.selector
);
6523 put_smstate(u16
, buf
, offset
+ 2, flags
);
6524 put_smstate(u32
, buf
, offset
+ 4, seg
.limit
);
6525 put_smstate(u64
, buf
, offset
+ 8, seg
.base
);
6529 static void enter_smm_save_state_32(struct kvm_vcpu
*vcpu
, char *buf
)
6532 struct kvm_segment seg
;
6536 put_smstate(u32
, buf
, 0x7ffc, kvm_read_cr0(vcpu
));
6537 put_smstate(u32
, buf
, 0x7ff8, kvm_read_cr3(vcpu
));
6538 put_smstate(u32
, buf
, 0x7ff4, kvm_get_rflags(vcpu
));
6539 put_smstate(u32
, buf
, 0x7ff0, kvm_rip_read(vcpu
));
6541 for (i
= 0; i
< 8; i
++)
6542 put_smstate(u32
, buf
, 0x7fd0 + i
* 4, kvm_register_read(vcpu
, i
));
6544 kvm_get_dr(vcpu
, 6, &val
);
6545 put_smstate(u32
, buf
, 0x7fcc, (u32
)val
);
6546 kvm_get_dr(vcpu
, 7, &val
);
6547 put_smstate(u32
, buf
, 0x7fc8, (u32
)val
);
6549 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_TR
);
6550 put_smstate(u32
, buf
, 0x7fc4, seg
.selector
);
6551 put_smstate(u32
, buf
, 0x7f64, seg
.base
);
6552 put_smstate(u32
, buf
, 0x7f60, seg
.limit
);
6553 put_smstate(u32
, buf
, 0x7f5c, enter_smm_get_segment_flags(&seg
));
6555 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_LDTR
);
6556 put_smstate(u32
, buf
, 0x7fc0, seg
.selector
);
6557 put_smstate(u32
, buf
, 0x7f80, seg
.base
);
6558 put_smstate(u32
, buf
, 0x7f7c, seg
.limit
);
6559 put_smstate(u32
, buf
, 0x7f78, enter_smm_get_segment_flags(&seg
));
6561 kvm_x86_ops
->get_gdt(vcpu
, &dt
);
6562 put_smstate(u32
, buf
, 0x7f74, dt
.address
);
6563 put_smstate(u32
, buf
, 0x7f70, dt
.size
);
6565 kvm_x86_ops
->get_idt(vcpu
, &dt
);
6566 put_smstate(u32
, buf
, 0x7f58, dt
.address
);
6567 put_smstate(u32
, buf
, 0x7f54, dt
.size
);
6569 for (i
= 0; i
< 6; i
++)
6570 enter_smm_save_seg_32(vcpu
, buf
, i
);
6572 put_smstate(u32
, buf
, 0x7f14, kvm_read_cr4(vcpu
));
6575 put_smstate(u32
, buf
, 0x7efc, 0x00020000);
6576 put_smstate(u32
, buf
, 0x7ef8, vcpu
->arch
.smbase
);
6579 static void enter_smm_save_state_64(struct kvm_vcpu
*vcpu
, char *buf
)
6581 #ifdef CONFIG_X86_64
6583 struct kvm_segment seg
;
6587 for (i
= 0; i
< 16; i
++)
6588 put_smstate(u64
, buf
, 0x7ff8 - i
* 8, kvm_register_read(vcpu
, i
));
6590 put_smstate(u64
, buf
, 0x7f78, kvm_rip_read(vcpu
));
6591 put_smstate(u32
, buf
, 0x7f70, kvm_get_rflags(vcpu
));
6593 kvm_get_dr(vcpu
, 6, &val
);
6594 put_smstate(u64
, buf
, 0x7f68, val
);
6595 kvm_get_dr(vcpu
, 7, &val
);
6596 put_smstate(u64
, buf
, 0x7f60, val
);
6598 put_smstate(u64
, buf
, 0x7f58, kvm_read_cr0(vcpu
));
6599 put_smstate(u64
, buf
, 0x7f50, kvm_read_cr3(vcpu
));
6600 put_smstate(u64
, buf
, 0x7f48, kvm_read_cr4(vcpu
));
6602 put_smstate(u32
, buf
, 0x7f00, vcpu
->arch
.smbase
);
6605 put_smstate(u32
, buf
, 0x7efc, 0x00020064);
6607 put_smstate(u64
, buf
, 0x7ed0, vcpu
->arch
.efer
);
6609 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_TR
);
6610 put_smstate(u16
, buf
, 0x7e90, seg
.selector
);
6611 put_smstate(u16
, buf
, 0x7e92, enter_smm_get_segment_flags(&seg
) >> 8);
6612 put_smstate(u32
, buf
, 0x7e94, seg
.limit
);
6613 put_smstate(u64
, buf
, 0x7e98, seg
.base
);
6615 kvm_x86_ops
->get_idt(vcpu
, &dt
);
6616 put_smstate(u32
, buf
, 0x7e84, dt
.size
);
6617 put_smstate(u64
, buf
, 0x7e88, dt
.address
);
6619 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_LDTR
);
6620 put_smstate(u16
, buf
, 0x7e70, seg
.selector
);
6621 put_smstate(u16
, buf
, 0x7e72, enter_smm_get_segment_flags(&seg
) >> 8);
6622 put_smstate(u32
, buf
, 0x7e74, seg
.limit
);
6623 put_smstate(u64
, buf
, 0x7e78, seg
.base
);
6625 kvm_x86_ops
->get_gdt(vcpu
, &dt
);
6626 put_smstate(u32
, buf
, 0x7e64, dt
.size
);
6627 put_smstate(u64
, buf
, 0x7e68, dt
.address
);
6629 for (i
= 0; i
< 6; i
++)
6630 enter_smm_save_seg_64(vcpu
, buf
, i
);
6636 static void enter_smm(struct kvm_vcpu
*vcpu
)
6638 struct kvm_segment cs
, ds
;
6643 trace_kvm_enter_smm(vcpu
->vcpu_id
, vcpu
->arch
.smbase
, true);
6644 vcpu
->arch
.hflags
|= HF_SMM_MASK
;
6645 memset(buf
, 0, 512);
6646 if (guest_cpuid_has(vcpu
, X86_FEATURE_LM
))
6647 enter_smm_save_state_64(vcpu
, buf
);
6649 enter_smm_save_state_32(vcpu
, buf
);
6651 kvm_vcpu_write_guest(vcpu
, vcpu
->arch
.smbase
+ 0xfe00, buf
, sizeof(buf
));
6653 if (kvm_x86_ops
->get_nmi_mask(vcpu
))
6654 vcpu
->arch
.hflags
|= HF_SMM_INSIDE_NMI_MASK
;
6656 kvm_x86_ops
->set_nmi_mask(vcpu
, true);
6658 kvm_set_rflags(vcpu
, X86_EFLAGS_FIXED
);
6659 kvm_rip_write(vcpu
, 0x8000);
6661 cr0
= vcpu
->arch
.cr0
& ~(X86_CR0_PE
| X86_CR0_EM
| X86_CR0_TS
| X86_CR0_PG
);
6662 kvm_x86_ops
->set_cr0(vcpu
, cr0
);
6663 vcpu
->arch
.cr0
= cr0
;
6665 kvm_x86_ops
->set_cr4(vcpu
, 0);
6667 /* Undocumented: IDT limit is set to zero on entry to SMM. */
6668 dt
.address
= dt
.size
= 0;
6669 kvm_x86_ops
->set_idt(vcpu
, &dt
);
6671 __kvm_set_dr(vcpu
, 7, DR7_FIXED_1
);
6673 cs
.selector
= (vcpu
->arch
.smbase
>> 4) & 0xffff;
6674 cs
.base
= vcpu
->arch
.smbase
;
6679 cs
.limit
= ds
.limit
= 0xffffffff;
6680 cs
.type
= ds
.type
= 0x3;
6681 cs
.dpl
= ds
.dpl
= 0;
6686 cs
.avl
= ds
.avl
= 0;
6687 cs
.present
= ds
.present
= 1;
6688 cs
.unusable
= ds
.unusable
= 0;
6689 cs
.padding
= ds
.padding
= 0;
6691 kvm_set_segment(vcpu
, &cs
, VCPU_SREG_CS
);
6692 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_DS
);
6693 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_ES
);
6694 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_FS
);
6695 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_GS
);
6696 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_SS
);
6698 if (guest_cpuid_has(vcpu
, X86_FEATURE_LM
))
6699 kvm_x86_ops
->set_efer(vcpu
, 0);
6701 kvm_update_cpuid(vcpu
);
6702 kvm_mmu_reset_context(vcpu
);
6705 static void process_smi(struct kvm_vcpu
*vcpu
)
6707 vcpu
->arch
.smi_pending
= true;
6708 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
6711 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
6713 kvm_make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
6716 static void vcpu_scan_ioapic(struct kvm_vcpu
*vcpu
)
6718 u64 eoi_exit_bitmap
[4];
6720 if (!kvm_apic_hw_enabled(vcpu
->arch
.apic
))
6723 bitmap_zero(vcpu
->arch
.ioapic_handled_vectors
, 256);
6725 if (irqchip_split(vcpu
->kvm
))
6726 kvm_scan_ioapic_routes(vcpu
, vcpu
->arch
.ioapic_handled_vectors
);
6728 if (kvm_x86_ops
->sync_pir_to_irr
&& vcpu
->arch
.apicv_active
)
6729 kvm_x86_ops
->sync_pir_to_irr(vcpu
);
6730 kvm_ioapic_scan_entry(vcpu
, vcpu
->arch
.ioapic_handled_vectors
);
6732 bitmap_or((ulong
*)eoi_exit_bitmap
, vcpu
->arch
.ioapic_handled_vectors
,
6733 vcpu_to_synic(vcpu
)->vec_bitmap
, 256);
6734 kvm_x86_ops
->load_eoi_exitmap(vcpu
, eoi_exit_bitmap
);
6737 static void kvm_vcpu_flush_tlb(struct kvm_vcpu
*vcpu
)
6739 ++vcpu
->stat
.tlb_flush
;
6740 kvm_x86_ops
->tlb_flush(vcpu
);
6743 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu
*vcpu
)
6745 struct page
*page
= NULL
;
6747 if (!lapic_in_kernel(vcpu
))
6750 if (!kvm_x86_ops
->set_apic_access_page_addr
)
6753 page
= gfn_to_page(vcpu
->kvm
, APIC_DEFAULT_PHYS_BASE
>> PAGE_SHIFT
);
6754 if (is_error_page(page
))
6756 kvm_x86_ops
->set_apic_access_page_addr(vcpu
, page_to_phys(page
));
6759 * Do not pin apic access page in memory, the MMU notifier
6760 * will call us again if it is migrated or swapped out.
6764 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page
);
6767 * Returns 1 to let vcpu_run() continue the guest execution loop without
6768 * exiting to the userspace. Otherwise, the value will be returned to the
6771 static int vcpu_enter_guest(struct kvm_vcpu
*vcpu
)
6775 dm_request_for_irq_injection(vcpu
) &&
6776 kvm_cpu_accept_dm_intr(vcpu
);
6778 bool req_immediate_exit
= false;
6780 if (kvm_request_pending(vcpu
)) {
6781 if (kvm_check_request(KVM_REQ_MMU_RELOAD
, vcpu
))
6782 kvm_mmu_unload(vcpu
);
6783 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER
, vcpu
))
6784 __kvm_migrate_timers(vcpu
);
6785 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
))
6786 kvm_gen_update_masterclock(vcpu
->kvm
);
6787 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE
, vcpu
))
6788 kvm_gen_kvmclock_update(vcpu
);
6789 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE
, vcpu
)) {
6790 r
= kvm_guest_time_update(vcpu
);
6794 if (kvm_check_request(KVM_REQ_MMU_SYNC
, vcpu
))
6795 kvm_mmu_sync_roots(vcpu
);
6796 if (kvm_check_request(KVM_REQ_TLB_FLUSH
, vcpu
))
6797 kvm_vcpu_flush_tlb(vcpu
);
6798 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS
, vcpu
)) {
6799 vcpu
->run
->exit_reason
= KVM_EXIT_TPR_ACCESS
;
6803 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT
, vcpu
)) {
6804 vcpu
->run
->exit_reason
= KVM_EXIT_SHUTDOWN
;
6805 vcpu
->mmio_needed
= 0;
6809 if (kvm_check_request(KVM_REQ_APF_HALT
, vcpu
)) {
6810 /* Page is swapped out. Do synthetic halt */
6811 vcpu
->arch
.apf
.halted
= true;
6815 if (kvm_check_request(KVM_REQ_STEAL_UPDATE
, vcpu
))
6816 record_steal_time(vcpu
);
6817 if (kvm_check_request(KVM_REQ_SMI
, vcpu
))
6819 if (kvm_check_request(KVM_REQ_NMI
, vcpu
))
6821 if (kvm_check_request(KVM_REQ_PMU
, vcpu
))
6822 kvm_pmu_handle_event(vcpu
);
6823 if (kvm_check_request(KVM_REQ_PMI
, vcpu
))
6824 kvm_pmu_deliver_pmi(vcpu
);
6825 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT
, vcpu
)) {
6826 BUG_ON(vcpu
->arch
.pending_ioapic_eoi
> 255);
6827 if (test_bit(vcpu
->arch
.pending_ioapic_eoi
,
6828 vcpu
->arch
.ioapic_handled_vectors
)) {
6829 vcpu
->run
->exit_reason
= KVM_EXIT_IOAPIC_EOI
;
6830 vcpu
->run
->eoi
.vector
=
6831 vcpu
->arch
.pending_ioapic_eoi
;
6836 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC
, vcpu
))
6837 vcpu_scan_ioapic(vcpu
);
6838 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD
, vcpu
))
6839 kvm_vcpu_reload_apic_access_page(vcpu
);
6840 if (kvm_check_request(KVM_REQ_HV_CRASH
, vcpu
)) {
6841 vcpu
->run
->exit_reason
= KVM_EXIT_SYSTEM_EVENT
;
6842 vcpu
->run
->system_event
.type
= KVM_SYSTEM_EVENT_CRASH
;
6846 if (kvm_check_request(KVM_REQ_HV_RESET
, vcpu
)) {
6847 vcpu
->run
->exit_reason
= KVM_EXIT_SYSTEM_EVENT
;
6848 vcpu
->run
->system_event
.type
= KVM_SYSTEM_EVENT_RESET
;
6852 if (kvm_check_request(KVM_REQ_HV_EXIT
, vcpu
)) {
6853 vcpu
->run
->exit_reason
= KVM_EXIT_HYPERV
;
6854 vcpu
->run
->hyperv
= vcpu
->arch
.hyperv
.exit
;
6860 * KVM_REQ_HV_STIMER has to be processed after
6861 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers
6862 * depend on the guest clock being up-to-date
6864 if (kvm_check_request(KVM_REQ_HV_STIMER
, vcpu
))
6865 kvm_hv_process_stimers(vcpu
);
6868 if (kvm_check_request(KVM_REQ_EVENT
, vcpu
) || req_int_win
) {
6869 ++vcpu
->stat
.req_event
;
6870 kvm_apic_accept_events(vcpu
);
6871 if (vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
) {
6876 if (inject_pending_event(vcpu
, req_int_win
) != 0)
6877 req_immediate_exit
= true;
6879 /* Enable NMI/IRQ window open exits if needed.
6881 * SMIs have two cases: 1) they can be nested, and
6882 * then there is nothing to do here because RSM will
6883 * cause a vmexit anyway; 2) or the SMI can be pending
6884 * because inject_pending_event has completed the
6885 * injection of an IRQ or NMI from the previous vmexit,
6886 * and then we request an immediate exit to inject the SMI.
6888 if (vcpu
->arch
.smi_pending
&& !is_smm(vcpu
))
6889 req_immediate_exit
= true;
6890 if (vcpu
->arch
.nmi_pending
)
6891 kvm_x86_ops
->enable_nmi_window(vcpu
);
6892 if (kvm_cpu_has_injectable_intr(vcpu
) || req_int_win
)
6893 kvm_x86_ops
->enable_irq_window(vcpu
);
6894 WARN_ON(vcpu
->arch
.exception
.pending
);
6897 if (kvm_lapic_enabled(vcpu
)) {
6898 update_cr8_intercept(vcpu
);
6899 kvm_lapic_sync_to_vapic(vcpu
);
6903 r
= kvm_mmu_reload(vcpu
);
6905 goto cancel_injection
;
6910 kvm_x86_ops
->prepare_guest_switch(vcpu
);
6911 kvm_load_guest_fpu(vcpu
);
6914 * Disable IRQs before setting IN_GUEST_MODE. Posted interrupt
6915 * IPI are then delayed after guest entry, which ensures that they
6916 * result in virtual interrupt delivery.
6918 local_irq_disable();
6919 vcpu
->mode
= IN_GUEST_MODE
;
6921 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
6924 * 1) We should set ->mode before checking ->requests. Please see
6925 * the comment in kvm_vcpu_exiting_guest_mode().
6927 * 2) For APICv, we should set ->mode before checking PIR.ON. This
6928 * pairs with the memory barrier implicit in pi_test_and_set_on
6929 * (see vmx_deliver_posted_interrupt).
6931 * 3) This also orders the write to mode from any reads to the page
6932 * tables done while the VCPU is running. Please see the comment
6933 * in kvm_flush_remote_tlbs.
6935 smp_mb__after_srcu_read_unlock();
6938 * This handles the case where a posted interrupt was
6939 * notified with kvm_vcpu_kick.
6941 if (kvm_lapic_enabled(vcpu
)) {
6942 if (kvm_x86_ops
->sync_pir_to_irr
&& vcpu
->arch
.apicv_active
)
6943 kvm_x86_ops
->sync_pir_to_irr(vcpu
);
6946 if (vcpu
->mode
== EXITING_GUEST_MODE
|| kvm_request_pending(vcpu
)
6947 || need_resched() || signal_pending(current
)) {
6948 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
6952 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
6954 goto cancel_injection
;
6957 kvm_load_guest_xcr0(vcpu
);
6959 if (req_immediate_exit
) {
6960 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
6961 smp_send_reschedule(vcpu
->cpu
);
6964 trace_kvm_entry(vcpu
->vcpu_id
);
6965 wait_lapic_expire(vcpu
);
6966 guest_enter_irqoff();
6968 if (unlikely(vcpu
->arch
.switch_db_regs
)) {
6970 set_debugreg(vcpu
->arch
.eff_db
[0], 0);
6971 set_debugreg(vcpu
->arch
.eff_db
[1], 1);
6972 set_debugreg(vcpu
->arch
.eff_db
[2], 2);
6973 set_debugreg(vcpu
->arch
.eff_db
[3], 3);
6974 set_debugreg(vcpu
->arch
.dr6
, 6);
6975 vcpu
->arch
.switch_db_regs
&= ~KVM_DEBUGREG_RELOAD
;
6978 kvm_x86_ops
->run(vcpu
);
6981 * Do this here before restoring debug registers on the host. And
6982 * since we do this before handling the vmexit, a DR access vmexit
6983 * can (a) read the correct value of the debug registers, (b) set
6984 * KVM_DEBUGREG_WONT_EXIT again.
6986 if (unlikely(vcpu
->arch
.switch_db_regs
& KVM_DEBUGREG_WONT_EXIT
)) {
6987 WARN_ON(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
);
6988 kvm_x86_ops
->sync_dirty_debug_regs(vcpu
);
6989 kvm_update_dr0123(vcpu
);
6990 kvm_update_dr6(vcpu
);
6991 kvm_update_dr7(vcpu
);
6992 vcpu
->arch
.switch_db_regs
&= ~KVM_DEBUGREG_RELOAD
;
6996 * If the guest has used debug registers, at least dr7
6997 * will be disabled while returning to the host.
6998 * If we don't have active breakpoints in the host, we don't
6999 * care about the messed up debug address registers. But if
7000 * we have some of them active, restore the old state.
7002 if (hw_breakpoint_active())
7003 hw_breakpoint_restore();
7005 vcpu
->arch
.last_guest_tsc
= kvm_read_l1_tsc(vcpu
, rdtsc());
7007 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
7010 kvm_put_guest_xcr0(vcpu
);
7012 kvm_x86_ops
->handle_external_intr(vcpu
);
7016 guest_exit_irqoff();
7021 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7024 * Profile KVM exit RIPs:
7026 if (unlikely(prof_on
== KVM_PROFILING
)) {
7027 unsigned long rip
= kvm_rip_read(vcpu
);
7028 profile_hit(KVM_PROFILING
, (void *)rip
);
7031 if (unlikely(vcpu
->arch
.tsc_always_catchup
))
7032 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
7034 if (vcpu
->arch
.apic_attention
)
7035 kvm_lapic_sync_from_vapic(vcpu
);
7037 vcpu
->arch
.gpa_available
= false;
7038 r
= kvm_x86_ops
->handle_exit(vcpu
);
7042 kvm_x86_ops
->cancel_injection(vcpu
);
7043 if (unlikely(vcpu
->arch
.apic_attention
))
7044 kvm_lapic_sync_from_vapic(vcpu
);
7049 static inline int vcpu_block(struct kvm
*kvm
, struct kvm_vcpu
*vcpu
)
7051 if (!kvm_arch_vcpu_runnable(vcpu
) &&
7052 (!kvm_x86_ops
->pre_block
|| kvm_x86_ops
->pre_block(vcpu
) == 0)) {
7053 srcu_read_unlock(&kvm
->srcu
, vcpu
->srcu_idx
);
7054 kvm_vcpu_block(vcpu
);
7055 vcpu
->srcu_idx
= srcu_read_lock(&kvm
->srcu
);
7057 if (kvm_x86_ops
->post_block
)
7058 kvm_x86_ops
->post_block(vcpu
);
7060 if (!kvm_check_request(KVM_REQ_UNHALT
, vcpu
))
7064 kvm_apic_accept_events(vcpu
);
7065 switch(vcpu
->arch
.mp_state
) {
7066 case KVM_MP_STATE_HALTED
:
7067 vcpu
->arch
.pv
.pv_unhalted
= false;
7068 vcpu
->arch
.mp_state
=
7069 KVM_MP_STATE_RUNNABLE
;
7070 case KVM_MP_STATE_RUNNABLE
:
7071 vcpu
->arch
.apf
.halted
= false;
7073 case KVM_MP_STATE_INIT_RECEIVED
:
7082 static inline bool kvm_vcpu_running(struct kvm_vcpu
*vcpu
)
7084 if (is_guest_mode(vcpu
) && kvm_x86_ops
->check_nested_events
)
7085 kvm_x86_ops
->check_nested_events(vcpu
, false);
7087 return (vcpu
->arch
.mp_state
== KVM_MP_STATE_RUNNABLE
&&
7088 !vcpu
->arch
.apf
.halted
);
7091 static int vcpu_run(struct kvm_vcpu
*vcpu
)
7094 struct kvm
*kvm
= vcpu
->kvm
;
7096 vcpu
->srcu_idx
= srcu_read_lock(&kvm
->srcu
);
7099 if (kvm_vcpu_running(vcpu
)) {
7100 r
= vcpu_enter_guest(vcpu
);
7102 r
= vcpu_block(kvm
, vcpu
);
7108 kvm_clear_request(KVM_REQ_PENDING_TIMER
, vcpu
);
7109 if (kvm_cpu_has_pending_timer(vcpu
))
7110 kvm_inject_pending_timer_irqs(vcpu
);
7112 if (dm_request_for_irq_injection(vcpu
) &&
7113 kvm_vcpu_ready_for_interrupt_injection(vcpu
)) {
7115 vcpu
->run
->exit_reason
= KVM_EXIT_IRQ_WINDOW_OPEN
;
7116 ++vcpu
->stat
.request_irq_exits
;
7120 kvm_check_async_pf_completion(vcpu
);
7122 if (signal_pending(current
)) {
7124 vcpu
->run
->exit_reason
= KVM_EXIT_INTR
;
7125 ++vcpu
->stat
.signal_exits
;
7128 if (need_resched()) {
7129 srcu_read_unlock(&kvm
->srcu
, vcpu
->srcu_idx
);
7131 vcpu
->srcu_idx
= srcu_read_lock(&kvm
->srcu
);
7135 srcu_read_unlock(&kvm
->srcu
, vcpu
->srcu_idx
);
7140 static inline int complete_emulated_io(struct kvm_vcpu
*vcpu
)
7143 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7144 r
= emulate_instruction(vcpu
, EMULTYPE_NO_DECODE
);
7145 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
7146 if (r
!= EMULATE_DONE
)
7151 static int complete_emulated_pio(struct kvm_vcpu
*vcpu
)
7153 BUG_ON(!vcpu
->arch
.pio
.count
);
7155 return complete_emulated_io(vcpu
);
7159 * Implements the following, as a state machine:
7163 * for each mmio piece in the fragment
7171 * for each mmio piece in the fragment
7176 static int complete_emulated_mmio(struct kvm_vcpu
*vcpu
)
7178 struct kvm_run
*run
= vcpu
->run
;
7179 struct kvm_mmio_fragment
*frag
;
7182 BUG_ON(!vcpu
->mmio_needed
);
7184 /* Complete previous fragment */
7185 frag
= &vcpu
->mmio_fragments
[vcpu
->mmio_cur_fragment
];
7186 len
= min(8u, frag
->len
);
7187 if (!vcpu
->mmio_is_write
)
7188 memcpy(frag
->data
, run
->mmio
.data
, len
);
7190 if (frag
->len
<= 8) {
7191 /* Switch to the next fragment. */
7193 vcpu
->mmio_cur_fragment
++;
7195 /* Go forward to the next mmio piece. */
7201 if (vcpu
->mmio_cur_fragment
>= vcpu
->mmio_nr_fragments
) {
7202 vcpu
->mmio_needed
= 0;
7204 /* FIXME: return into emulator if single-stepping. */
7205 if (vcpu
->mmio_is_write
)
7207 vcpu
->mmio_read_completed
= 1;
7208 return complete_emulated_io(vcpu
);
7211 run
->exit_reason
= KVM_EXIT_MMIO
;
7212 run
->mmio
.phys_addr
= frag
->gpa
;
7213 if (vcpu
->mmio_is_write
)
7214 memcpy(run
->mmio
.data
, frag
->data
, min(8u, frag
->len
));
7215 run
->mmio
.len
= min(8u, frag
->len
);
7216 run
->mmio
.is_write
= vcpu
->mmio_is_write
;
7217 vcpu
->arch
.complete_userspace_io
= complete_emulated_mmio
;
7222 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*kvm_run
)
7224 struct fpu
*fpu
= ¤t
->thread
.fpu
;
7228 fpu__activate_curr(fpu
);
7230 if (vcpu
->sigset_active
)
7231 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
7233 if (unlikely(vcpu
->arch
.mp_state
== KVM_MP_STATE_UNINITIALIZED
)) {
7234 if (kvm_run
->immediate_exit
) {
7238 kvm_vcpu_block(vcpu
);
7239 kvm_apic_accept_events(vcpu
);
7240 kvm_clear_request(KVM_REQ_UNHALT
, vcpu
);
7242 if (signal_pending(current
)) {
7244 vcpu
->run
->exit_reason
= KVM_EXIT_INTR
;
7245 ++vcpu
->stat
.signal_exits
;
7250 /* re-sync apic's tpr */
7251 if (!lapic_in_kernel(vcpu
)) {
7252 if (kvm_set_cr8(vcpu
, kvm_run
->cr8
) != 0) {
7258 if (unlikely(vcpu
->arch
.complete_userspace_io
)) {
7259 int (*cui
)(struct kvm_vcpu
*) = vcpu
->arch
.complete_userspace_io
;
7260 vcpu
->arch
.complete_userspace_io
= NULL
;
7265 WARN_ON(vcpu
->arch
.pio
.count
|| vcpu
->mmio_needed
);
7267 if (kvm_run
->immediate_exit
)
7273 post_kvm_run_save(vcpu
);
7274 if (vcpu
->sigset_active
)
7275 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
7280 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu
*vcpu
, struct kvm_regs
*regs
)
7282 if (vcpu
->arch
.emulate_regs_need_sync_to_vcpu
) {
7284 * We are here if userspace calls get_regs() in the middle of
7285 * instruction emulation. Registers state needs to be copied
7286 * back from emulation context to vcpu. Userspace shouldn't do
7287 * that usually, but some bad designed PV devices (vmware
7288 * backdoor interface) need this to work
7290 emulator_writeback_register_cache(&vcpu
->arch
.emulate_ctxt
);
7291 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= false;
7293 regs
->rax
= kvm_register_read(vcpu
, VCPU_REGS_RAX
);
7294 regs
->rbx
= kvm_register_read(vcpu
, VCPU_REGS_RBX
);
7295 regs
->rcx
= kvm_register_read(vcpu
, VCPU_REGS_RCX
);
7296 regs
->rdx
= kvm_register_read(vcpu
, VCPU_REGS_RDX
);
7297 regs
->rsi
= kvm_register_read(vcpu
, VCPU_REGS_RSI
);
7298 regs
->rdi
= kvm_register_read(vcpu
, VCPU_REGS_RDI
);
7299 regs
->rsp
= kvm_register_read(vcpu
, VCPU_REGS_RSP
);
7300 regs
->rbp
= kvm_register_read(vcpu
, VCPU_REGS_RBP
);
7301 #ifdef CONFIG_X86_64
7302 regs
->r8
= kvm_register_read(vcpu
, VCPU_REGS_R8
);
7303 regs
->r9
= kvm_register_read(vcpu
, VCPU_REGS_R9
);
7304 regs
->r10
= kvm_register_read(vcpu
, VCPU_REGS_R10
);
7305 regs
->r11
= kvm_register_read(vcpu
, VCPU_REGS_R11
);
7306 regs
->r12
= kvm_register_read(vcpu
, VCPU_REGS_R12
);
7307 regs
->r13
= kvm_register_read(vcpu
, VCPU_REGS_R13
);
7308 regs
->r14
= kvm_register_read(vcpu
, VCPU_REGS_R14
);
7309 regs
->r15
= kvm_register_read(vcpu
, VCPU_REGS_R15
);
7312 regs
->rip
= kvm_rip_read(vcpu
);
7313 regs
->rflags
= kvm_get_rflags(vcpu
);
7318 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu
*vcpu
, struct kvm_regs
*regs
)
7320 vcpu
->arch
.emulate_regs_need_sync_from_vcpu
= true;
7321 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= false;
7323 kvm_register_write(vcpu
, VCPU_REGS_RAX
, regs
->rax
);
7324 kvm_register_write(vcpu
, VCPU_REGS_RBX
, regs
->rbx
);
7325 kvm_register_write(vcpu
, VCPU_REGS_RCX
, regs
->rcx
);
7326 kvm_register_write(vcpu
, VCPU_REGS_RDX
, regs
->rdx
);
7327 kvm_register_write(vcpu
, VCPU_REGS_RSI
, regs
->rsi
);
7328 kvm_register_write(vcpu
, VCPU_REGS_RDI
, regs
->rdi
);
7329 kvm_register_write(vcpu
, VCPU_REGS_RSP
, regs
->rsp
);
7330 kvm_register_write(vcpu
, VCPU_REGS_RBP
, regs
->rbp
);
7331 #ifdef CONFIG_X86_64
7332 kvm_register_write(vcpu
, VCPU_REGS_R8
, regs
->r8
);
7333 kvm_register_write(vcpu
, VCPU_REGS_R9
, regs
->r9
);
7334 kvm_register_write(vcpu
, VCPU_REGS_R10
, regs
->r10
);
7335 kvm_register_write(vcpu
, VCPU_REGS_R11
, regs
->r11
);
7336 kvm_register_write(vcpu
, VCPU_REGS_R12
, regs
->r12
);
7337 kvm_register_write(vcpu
, VCPU_REGS_R13
, regs
->r13
);
7338 kvm_register_write(vcpu
, VCPU_REGS_R14
, regs
->r14
);
7339 kvm_register_write(vcpu
, VCPU_REGS_R15
, regs
->r15
);
7342 kvm_rip_write(vcpu
, regs
->rip
);
7343 kvm_set_rflags(vcpu
, regs
->rflags
);
7345 vcpu
->arch
.exception
.pending
= false;
7347 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7352 void kvm_get_cs_db_l_bits(struct kvm_vcpu
*vcpu
, int *db
, int *l
)
7354 struct kvm_segment cs
;
7356 kvm_get_segment(vcpu
, &cs
, VCPU_SREG_CS
);
7360 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits
);
7362 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu
*vcpu
,
7363 struct kvm_sregs
*sregs
)
7367 kvm_get_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
7368 kvm_get_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
7369 kvm_get_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
7370 kvm_get_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
7371 kvm_get_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
7372 kvm_get_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
7374 kvm_get_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
7375 kvm_get_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
7377 kvm_x86_ops
->get_idt(vcpu
, &dt
);
7378 sregs
->idt
.limit
= dt
.size
;
7379 sregs
->idt
.base
= dt
.address
;
7380 kvm_x86_ops
->get_gdt(vcpu
, &dt
);
7381 sregs
->gdt
.limit
= dt
.size
;
7382 sregs
->gdt
.base
= dt
.address
;
7384 sregs
->cr0
= kvm_read_cr0(vcpu
);
7385 sregs
->cr2
= vcpu
->arch
.cr2
;
7386 sregs
->cr3
= kvm_read_cr3(vcpu
);
7387 sregs
->cr4
= kvm_read_cr4(vcpu
);
7388 sregs
->cr8
= kvm_get_cr8(vcpu
);
7389 sregs
->efer
= vcpu
->arch
.efer
;
7390 sregs
->apic_base
= kvm_get_apic_base(vcpu
);
7392 memset(sregs
->interrupt_bitmap
, 0, sizeof sregs
->interrupt_bitmap
);
7394 if (vcpu
->arch
.interrupt
.pending
&& !vcpu
->arch
.interrupt
.soft
)
7395 set_bit(vcpu
->arch
.interrupt
.nr
,
7396 (unsigned long *)sregs
->interrupt_bitmap
);
7401 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
7402 struct kvm_mp_state
*mp_state
)
7404 kvm_apic_accept_events(vcpu
);
7405 if (vcpu
->arch
.mp_state
== KVM_MP_STATE_HALTED
&&
7406 vcpu
->arch
.pv
.pv_unhalted
)
7407 mp_state
->mp_state
= KVM_MP_STATE_RUNNABLE
;
7409 mp_state
->mp_state
= vcpu
->arch
.mp_state
;
7414 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
7415 struct kvm_mp_state
*mp_state
)
7417 if (!lapic_in_kernel(vcpu
) &&
7418 mp_state
->mp_state
!= KVM_MP_STATE_RUNNABLE
)
7421 /* INITs are latched while in SMM */
7422 if ((is_smm(vcpu
) || vcpu
->arch
.smi_pending
) &&
7423 (mp_state
->mp_state
== KVM_MP_STATE_SIPI_RECEIVED
||
7424 mp_state
->mp_state
== KVM_MP_STATE_INIT_RECEIVED
))
7427 if (mp_state
->mp_state
== KVM_MP_STATE_SIPI_RECEIVED
) {
7428 vcpu
->arch
.mp_state
= KVM_MP_STATE_INIT_RECEIVED
;
7429 set_bit(KVM_APIC_SIPI
, &vcpu
->arch
.apic
->pending_events
);
7431 vcpu
->arch
.mp_state
= mp_state
->mp_state
;
7432 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7436 int kvm_task_switch(struct kvm_vcpu
*vcpu
, u16 tss_selector
, int idt_index
,
7437 int reason
, bool has_error_code
, u32 error_code
)
7439 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
7442 init_emulate_ctxt(vcpu
);
7444 ret
= emulator_task_switch(ctxt
, tss_selector
, idt_index
, reason
,
7445 has_error_code
, error_code
);
7448 return EMULATE_FAIL
;
7450 kvm_rip_write(vcpu
, ctxt
->eip
);
7451 kvm_set_rflags(vcpu
, ctxt
->eflags
);
7452 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7453 return EMULATE_DONE
;
7455 EXPORT_SYMBOL_GPL(kvm_task_switch
);
7457 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu
*vcpu
,
7458 struct kvm_sregs
*sregs
)
7460 struct msr_data apic_base_msr
;
7461 int mmu_reset_needed
= 0;
7462 int pending_vec
, max_bits
, idx
;
7465 if (!guest_cpuid_has(vcpu
, X86_FEATURE_XSAVE
) &&
7466 (sregs
->cr4
& X86_CR4_OSXSAVE
))
7469 apic_base_msr
.data
= sregs
->apic_base
;
7470 apic_base_msr
.host_initiated
= true;
7471 if (kvm_set_apic_base(vcpu
, &apic_base_msr
))
7474 dt
.size
= sregs
->idt
.limit
;
7475 dt
.address
= sregs
->idt
.base
;
7476 kvm_x86_ops
->set_idt(vcpu
, &dt
);
7477 dt
.size
= sregs
->gdt
.limit
;
7478 dt
.address
= sregs
->gdt
.base
;
7479 kvm_x86_ops
->set_gdt(vcpu
, &dt
);
7481 vcpu
->arch
.cr2
= sregs
->cr2
;
7482 mmu_reset_needed
|= kvm_read_cr3(vcpu
) != sregs
->cr3
;
7483 vcpu
->arch
.cr3
= sregs
->cr3
;
7484 __set_bit(VCPU_EXREG_CR3
, (ulong
*)&vcpu
->arch
.regs_avail
);
7486 kvm_set_cr8(vcpu
, sregs
->cr8
);
7488 mmu_reset_needed
|= vcpu
->arch
.efer
!= sregs
->efer
;
7489 kvm_x86_ops
->set_efer(vcpu
, sregs
->efer
);
7491 mmu_reset_needed
|= kvm_read_cr0(vcpu
) != sregs
->cr0
;
7492 kvm_x86_ops
->set_cr0(vcpu
, sregs
->cr0
);
7493 vcpu
->arch
.cr0
= sregs
->cr0
;
7495 mmu_reset_needed
|= kvm_read_cr4(vcpu
) != sregs
->cr4
;
7496 kvm_x86_ops
->set_cr4(vcpu
, sregs
->cr4
);
7497 if (sregs
->cr4
& (X86_CR4_OSXSAVE
| X86_CR4_PKE
))
7498 kvm_update_cpuid(vcpu
);
7500 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7501 if (!is_long_mode(vcpu
) && is_pae(vcpu
)) {
7502 load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
, kvm_read_cr3(vcpu
));
7503 mmu_reset_needed
= 1;
7505 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
7507 if (mmu_reset_needed
)
7508 kvm_mmu_reset_context(vcpu
);
7510 max_bits
= KVM_NR_INTERRUPTS
;
7511 pending_vec
= find_first_bit(
7512 (const unsigned long *)sregs
->interrupt_bitmap
, max_bits
);
7513 if (pending_vec
< max_bits
) {
7514 kvm_queue_interrupt(vcpu
, pending_vec
, false);
7515 pr_debug("Set back pending irq %d\n", pending_vec
);
7518 kvm_set_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
7519 kvm_set_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
7520 kvm_set_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
7521 kvm_set_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
7522 kvm_set_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
7523 kvm_set_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
7525 kvm_set_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
7526 kvm_set_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
7528 update_cr8_intercept(vcpu
);
7530 /* Older userspace won't unhalt the vcpu on reset. */
7531 if (kvm_vcpu_is_bsp(vcpu
) && kvm_rip_read(vcpu
) == 0xfff0 &&
7532 sregs
->cs
.selector
== 0xf000 && sregs
->cs
.base
== 0xffff0000 &&
7534 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
7536 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7541 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu
*vcpu
,
7542 struct kvm_guest_debug
*dbg
)
7544 unsigned long rflags
;
7547 if (dbg
->control
& (KVM_GUESTDBG_INJECT_DB
| KVM_GUESTDBG_INJECT_BP
)) {
7549 if (vcpu
->arch
.exception
.pending
)
7551 if (dbg
->control
& KVM_GUESTDBG_INJECT_DB
)
7552 kvm_queue_exception(vcpu
, DB_VECTOR
);
7554 kvm_queue_exception(vcpu
, BP_VECTOR
);
7558 * Read rflags as long as potentially injected trace flags are still
7561 rflags
= kvm_get_rflags(vcpu
);
7563 vcpu
->guest_debug
= dbg
->control
;
7564 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_ENABLE
))
7565 vcpu
->guest_debug
= 0;
7567 if (vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
) {
7568 for (i
= 0; i
< KVM_NR_DB_REGS
; ++i
)
7569 vcpu
->arch
.eff_db
[i
] = dbg
->arch
.debugreg
[i
];
7570 vcpu
->arch
.guest_debug_dr7
= dbg
->arch
.debugreg
[7];
7572 for (i
= 0; i
< KVM_NR_DB_REGS
; i
++)
7573 vcpu
->arch
.eff_db
[i
] = vcpu
->arch
.db
[i
];
7575 kvm_update_dr7(vcpu
);
7577 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
)
7578 vcpu
->arch
.singlestep_rip
= kvm_rip_read(vcpu
) +
7579 get_segment_base(vcpu
, VCPU_SREG_CS
);
7582 * Trigger an rflags update that will inject or remove the trace
7585 kvm_set_rflags(vcpu
, rflags
);
7587 kvm_x86_ops
->update_bp_intercept(vcpu
);
7597 * Translate a guest virtual address to a guest physical address.
7599 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu
*vcpu
,
7600 struct kvm_translation
*tr
)
7602 unsigned long vaddr
= tr
->linear_address
;
7606 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7607 gpa
= kvm_mmu_gva_to_gpa_system(vcpu
, vaddr
, NULL
);
7608 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
7609 tr
->physical_address
= gpa
;
7610 tr
->valid
= gpa
!= UNMAPPED_GVA
;
7617 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu
*vcpu
, struct kvm_fpu
*fpu
)
7619 struct fxregs_state
*fxsave
=
7620 &vcpu
->arch
.guest_fpu
.state
.fxsave
;
7622 memcpy(fpu
->fpr
, fxsave
->st_space
, 128);
7623 fpu
->fcw
= fxsave
->cwd
;
7624 fpu
->fsw
= fxsave
->swd
;
7625 fpu
->ftwx
= fxsave
->twd
;
7626 fpu
->last_opcode
= fxsave
->fop
;
7627 fpu
->last_ip
= fxsave
->rip
;
7628 fpu
->last_dp
= fxsave
->rdp
;
7629 memcpy(fpu
->xmm
, fxsave
->xmm_space
, sizeof fxsave
->xmm_space
);
7634 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu
*vcpu
, struct kvm_fpu
*fpu
)
7636 struct fxregs_state
*fxsave
=
7637 &vcpu
->arch
.guest_fpu
.state
.fxsave
;
7639 memcpy(fxsave
->st_space
, fpu
->fpr
, 128);
7640 fxsave
->cwd
= fpu
->fcw
;
7641 fxsave
->swd
= fpu
->fsw
;
7642 fxsave
->twd
= fpu
->ftwx
;
7643 fxsave
->fop
= fpu
->last_opcode
;
7644 fxsave
->rip
= fpu
->last_ip
;
7645 fxsave
->rdp
= fpu
->last_dp
;
7646 memcpy(fxsave
->xmm_space
, fpu
->xmm
, sizeof fxsave
->xmm_space
);
7651 static void fx_init(struct kvm_vcpu
*vcpu
)
7653 fpstate_init(&vcpu
->arch
.guest_fpu
.state
);
7654 if (boot_cpu_has(X86_FEATURE_XSAVES
))
7655 vcpu
->arch
.guest_fpu
.state
.xsave
.header
.xcomp_bv
=
7656 host_xcr0
| XSTATE_COMPACTION_ENABLED
;
7659 * Ensure guest xcr0 is valid for loading
7661 vcpu
->arch
.xcr0
= XFEATURE_MASK_FP
;
7663 vcpu
->arch
.cr0
|= X86_CR0_ET
;
7666 void kvm_load_guest_fpu(struct kvm_vcpu
*vcpu
)
7668 if (vcpu
->guest_fpu_loaded
)
7672 * Restore all possible states in the guest,
7673 * and assume host would use all available bits.
7674 * Guest xcr0 would be loaded later.
7676 vcpu
->guest_fpu_loaded
= 1;
7677 __kernel_fpu_begin();
7678 /* PKRU is separately restored in kvm_x86_ops->run. */
7679 __copy_kernel_to_fpregs(&vcpu
->arch
.guest_fpu
.state
,
7680 ~XFEATURE_MASK_PKRU
);
7684 void kvm_put_guest_fpu(struct kvm_vcpu
*vcpu
)
7686 if (!vcpu
->guest_fpu_loaded
)
7689 vcpu
->guest_fpu_loaded
= 0;
7690 copy_fpregs_to_fpstate(&vcpu
->arch
.guest_fpu
);
7692 ++vcpu
->stat
.fpu_reload
;
7696 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
7698 void *wbinvd_dirty_mask
= vcpu
->arch
.wbinvd_dirty_mask
;
7700 kvmclock_reset(vcpu
);
7702 kvm_x86_ops
->vcpu_free(vcpu
);
7703 free_cpumask_var(wbinvd_dirty_mask
);
7706 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
,
7709 struct kvm_vcpu
*vcpu
;
7711 if (check_tsc_unstable() && atomic_read(&kvm
->online_vcpus
) != 0)
7712 printk_once(KERN_WARNING
7713 "kvm: SMP vm created on host with unstable TSC; "
7714 "guest TSC will not be reliable\n");
7716 vcpu
= kvm_x86_ops
->vcpu_create(kvm
, id
);
7721 int kvm_arch_vcpu_setup(struct kvm_vcpu
*vcpu
)
7725 kvm_vcpu_mtrr_init(vcpu
);
7726 r
= vcpu_load(vcpu
);
7729 kvm_vcpu_reset(vcpu
, false);
7730 kvm_mmu_setup(vcpu
);
7735 void kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
7737 struct msr_data msr
;
7738 struct kvm
*kvm
= vcpu
->kvm
;
7740 kvm_hv_vcpu_postcreate(vcpu
);
7742 if (vcpu_load(vcpu
))
7745 msr
.index
= MSR_IA32_TSC
;
7746 msr
.host_initiated
= true;
7747 kvm_write_tsc(vcpu
, &msr
);
7750 if (!kvmclock_periodic_sync
)
7753 schedule_delayed_work(&kvm
->arch
.kvmclock_sync_work
,
7754 KVMCLOCK_SYNC_PERIOD
);
7757 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
7760 vcpu
->arch
.apf
.msr_val
= 0;
7762 r
= vcpu_load(vcpu
);
7764 kvm_mmu_unload(vcpu
);
7767 kvm_x86_ops
->vcpu_free(vcpu
);
7770 void kvm_vcpu_reset(struct kvm_vcpu
*vcpu
, bool init_event
)
7772 vcpu
->arch
.hflags
= 0;
7774 vcpu
->arch
.smi_pending
= 0;
7775 atomic_set(&vcpu
->arch
.nmi_queued
, 0);
7776 vcpu
->arch
.nmi_pending
= 0;
7777 vcpu
->arch
.nmi_injected
= false;
7778 kvm_clear_interrupt_queue(vcpu
);
7779 kvm_clear_exception_queue(vcpu
);
7780 vcpu
->arch
.exception
.pending
= false;
7782 memset(vcpu
->arch
.db
, 0, sizeof(vcpu
->arch
.db
));
7783 kvm_update_dr0123(vcpu
);
7784 vcpu
->arch
.dr6
= DR6_INIT
;
7785 kvm_update_dr6(vcpu
);
7786 vcpu
->arch
.dr7
= DR7_FIXED_1
;
7787 kvm_update_dr7(vcpu
);
7791 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7792 vcpu
->arch
.apf
.msr_val
= 0;
7793 vcpu
->arch
.st
.msr_val
= 0;
7795 kvmclock_reset(vcpu
);
7797 kvm_clear_async_pf_completion_queue(vcpu
);
7798 kvm_async_pf_hash_reset(vcpu
);
7799 vcpu
->arch
.apf
.halted
= false;
7802 kvm_pmu_reset(vcpu
);
7803 vcpu
->arch
.smbase
= 0x30000;
7805 vcpu
->arch
.msr_platform_info
= MSR_PLATFORM_INFO_CPUID_FAULT
;
7806 vcpu
->arch
.msr_misc_features_enables
= 0;
7809 memset(vcpu
->arch
.regs
, 0, sizeof(vcpu
->arch
.regs
));
7810 vcpu
->arch
.regs_avail
= ~0;
7811 vcpu
->arch
.regs_dirty
= ~0;
7813 kvm_x86_ops
->vcpu_reset(vcpu
, init_event
);
7816 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu
*vcpu
, u8 vector
)
7818 struct kvm_segment cs
;
7820 kvm_get_segment(vcpu
, &cs
, VCPU_SREG_CS
);
7821 cs
.selector
= vector
<< 8;
7822 cs
.base
= vector
<< 12;
7823 kvm_set_segment(vcpu
, &cs
, VCPU_SREG_CS
);
7824 kvm_rip_write(vcpu
, 0);
7827 int kvm_arch_hardware_enable(void)
7830 struct kvm_vcpu
*vcpu
;
7835 bool stable
, backwards_tsc
= false;
7837 kvm_shared_msr_cpu_online();
7838 ret
= kvm_x86_ops
->hardware_enable();
7842 local_tsc
= rdtsc();
7843 stable
= !check_tsc_unstable();
7844 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
7845 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
7846 if (!stable
&& vcpu
->cpu
== smp_processor_id())
7847 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
7848 if (stable
&& vcpu
->arch
.last_host_tsc
> local_tsc
) {
7849 backwards_tsc
= true;
7850 if (vcpu
->arch
.last_host_tsc
> max_tsc
)
7851 max_tsc
= vcpu
->arch
.last_host_tsc
;
7857 * Sometimes, even reliable TSCs go backwards. This happens on
7858 * platforms that reset TSC during suspend or hibernate actions, but
7859 * maintain synchronization. We must compensate. Fortunately, we can
7860 * detect that condition here, which happens early in CPU bringup,
7861 * before any KVM threads can be running. Unfortunately, we can't
7862 * bring the TSCs fully up to date with real time, as we aren't yet far
7863 * enough into CPU bringup that we know how much real time has actually
7864 * elapsed; our helper function, ktime_get_boot_ns() will be using boot
7865 * variables that haven't been updated yet.
7867 * So we simply find the maximum observed TSC above, then record the
7868 * adjustment to TSC in each VCPU. When the VCPU later gets loaded,
7869 * the adjustment will be applied. Note that we accumulate
7870 * adjustments, in case multiple suspend cycles happen before some VCPU
7871 * gets a chance to run again. In the event that no KVM threads get a
7872 * chance to run, we will miss the entire elapsed period, as we'll have
7873 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
7874 * loose cycle time. This isn't too big a deal, since the loss will be
7875 * uniform across all VCPUs (not to mention the scenario is extremely
7876 * unlikely). It is possible that a second hibernate recovery happens
7877 * much faster than a first, causing the observed TSC here to be
7878 * smaller; this would require additional padding adjustment, which is
7879 * why we set last_host_tsc to the local tsc observed here.
7881 * N.B. - this code below runs only on platforms with reliable TSC,
7882 * as that is the only way backwards_tsc is set above. Also note
7883 * that this runs for ALL vcpus, which is not a bug; all VCPUs should
7884 * have the same delta_cyc adjustment applied if backwards_tsc
7885 * is detected. Note further, this adjustment is only done once,
7886 * as we reset last_host_tsc on all VCPUs to stop this from being
7887 * called multiple times (one for each physical CPU bringup).
7889 * Platforms with unreliable TSCs don't have to deal with this, they
7890 * will be compensated by the logic in vcpu_load, which sets the TSC to
7891 * catchup mode. This will catchup all VCPUs to real time, but cannot
7892 * guarantee that they stay in perfect synchronization.
7894 if (backwards_tsc
) {
7895 u64 delta_cyc
= max_tsc
- local_tsc
;
7896 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
7897 kvm
->arch
.backwards_tsc_observed
= true;
7898 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
7899 vcpu
->arch
.tsc_offset_adjustment
+= delta_cyc
;
7900 vcpu
->arch
.last_host_tsc
= local_tsc
;
7901 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
7905 * We have to disable TSC offset matching.. if you were
7906 * booting a VM while issuing an S4 host suspend....
7907 * you may have some problem. Solving this issue is
7908 * left as an exercise to the reader.
7910 kvm
->arch
.last_tsc_nsec
= 0;
7911 kvm
->arch
.last_tsc_write
= 0;
7918 void kvm_arch_hardware_disable(void)
7920 kvm_x86_ops
->hardware_disable();
7921 drop_user_return_notifiers();
7924 int kvm_arch_hardware_setup(void)
7928 r
= kvm_x86_ops
->hardware_setup();
7932 if (kvm_has_tsc_control
) {
7934 * Make sure the user can only configure tsc_khz values that
7935 * fit into a signed integer.
7936 * A min value is not calculated needed because it will always
7937 * be 1 on all machines.
7939 u64 max
= min(0x7fffffffULL
,
7940 __scale_tsc(kvm_max_tsc_scaling_ratio
, tsc_khz
));
7941 kvm_max_guest_tsc_khz
= max
;
7943 kvm_default_tsc_scaling_ratio
= 1ULL << kvm_tsc_scaling_ratio_frac_bits
;
7946 kvm_init_msr_list();
7950 void kvm_arch_hardware_unsetup(void)
7952 kvm_x86_ops
->hardware_unsetup();
7955 void kvm_arch_check_processor_compat(void *rtn
)
7957 kvm_x86_ops
->check_processor_compatibility(rtn
);
7960 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu
*vcpu
)
7962 return vcpu
->kvm
->arch
.bsp_vcpu_id
== vcpu
->vcpu_id
;
7964 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp
);
7966 bool kvm_vcpu_is_bsp(struct kvm_vcpu
*vcpu
)
7968 return (vcpu
->arch
.apic_base
& MSR_IA32_APICBASE_BSP
) != 0;
7971 struct static_key kvm_no_apic_vcpu __read_mostly
;
7972 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu
);
7974 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
7980 BUG_ON(vcpu
->kvm
== NULL
);
7983 vcpu
->arch
.apicv_active
= kvm_x86_ops
->get_enable_apicv(vcpu
);
7984 vcpu
->arch
.pv
.pv_unhalted
= false;
7985 vcpu
->arch
.emulate_ctxt
.ops
= &emulate_ops
;
7986 if (!irqchip_in_kernel(kvm
) || kvm_vcpu_is_reset_bsp(vcpu
))
7987 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
7989 vcpu
->arch
.mp_state
= KVM_MP_STATE_UNINITIALIZED
;
7991 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
7996 vcpu
->arch
.pio_data
= page_address(page
);
7998 kvm_set_tsc_khz(vcpu
, max_tsc_khz
);
8000 r
= kvm_mmu_create(vcpu
);
8002 goto fail_free_pio_data
;
8004 if (irqchip_in_kernel(kvm
)) {
8005 r
= kvm_create_lapic(vcpu
);
8007 goto fail_mmu_destroy
;
8009 static_key_slow_inc(&kvm_no_apic_vcpu
);
8011 vcpu
->arch
.mce_banks
= kzalloc(KVM_MAX_MCE_BANKS
* sizeof(u64
) * 4,
8013 if (!vcpu
->arch
.mce_banks
) {
8015 goto fail_free_lapic
;
8017 vcpu
->arch
.mcg_cap
= KVM_MAX_MCE_BANKS
;
8019 if (!zalloc_cpumask_var(&vcpu
->arch
.wbinvd_dirty_mask
, GFP_KERNEL
)) {
8021 goto fail_free_mce_banks
;
8026 vcpu
->arch
.ia32_tsc_adjust_msr
= 0x0;
8027 vcpu
->arch
.pv_time_enabled
= false;
8029 vcpu
->arch
.guest_supported_xcr0
= 0;
8030 vcpu
->arch
.guest_xstate_size
= XSAVE_HDR_SIZE
+ XSAVE_HDR_OFFSET
;
8032 vcpu
->arch
.maxphyaddr
= cpuid_query_maxphyaddr(vcpu
);
8034 vcpu
->arch
.pat
= MSR_IA32_CR_PAT_DEFAULT
;
8036 kvm_async_pf_hash_reset(vcpu
);
8039 vcpu
->arch
.pending_external_vector
= -1;
8040 vcpu
->arch
.preempted_in_kernel
= false;
8042 kvm_hv_vcpu_init(vcpu
);
8046 fail_free_mce_banks
:
8047 kfree(vcpu
->arch
.mce_banks
);
8049 kvm_free_lapic(vcpu
);
8051 kvm_mmu_destroy(vcpu
);
8053 free_page((unsigned long)vcpu
->arch
.pio_data
);
8058 void kvm_arch_vcpu_uninit(struct kvm_vcpu
*vcpu
)
8062 kvm_hv_vcpu_uninit(vcpu
);
8063 kvm_pmu_destroy(vcpu
);
8064 kfree(vcpu
->arch
.mce_banks
);
8065 kvm_free_lapic(vcpu
);
8066 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
8067 kvm_mmu_destroy(vcpu
);
8068 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
8069 free_page((unsigned long)vcpu
->arch
.pio_data
);
8070 if (!lapic_in_kernel(vcpu
))
8071 static_key_slow_dec(&kvm_no_apic_vcpu
);
8074 void kvm_arch_sched_in(struct kvm_vcpu
*vcpu
, int cpu
)
8076 kvm_x86_ops
->sched_in(vcpu
, cpu
);
8079 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
8084 INIT_HLIST_HEAD(&kvm
->arch
.mask_notifier_list
);
8085 INIT_LIST_HEAD(&kvm
->arch
.active_mmu_pages
);
8086 INIT_LIST_HEAD(&kvm
->arch
.zapped_obsolete_pages
);
8087 INIT_LIST_HEAD(&kvm
->arch
.assigned_dev_head
);
8088 atomic_set(&kvm
->arch
.noncoherent_dma_count
, 0);
8090 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
8091 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID
, &kvm
->arch
.irq_sources_bitmap
);
8092 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
8093 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID
,
8094 &kvm
->arch
.irq_sources_bitmap
);
8096 raw_spin_lock_init(&kvm
->arch
.tsc_write_lock
);
8097 mutex_init(&kvm
->arch
.apic_map_lock
);
8098 mutex_init(&kvm
->arch
.hyperv
.hv_lock
);
8099 spin_lock_init(&kvm
->arch
.pvclock_gtod_sync_lock
);
8101 kvm
->arch
.kvmclock_offset
= -ktime_get_boot_ns();
8102 pvclock_update_vm_gtod_copy(kvm
);
8104 INIT_DELAYED_WORK(&kvm
->arch
.kvmclock_update_work
, kvmclock_update_fn
);
8105 INIT_DELAYED_WORK(&kvm
->arch
.kvmclock_sync_work
, kvmclock_sync_fn
);
8107 kvm_page_track_init(kvm
);
8108 kvm_mmu_init_vm(kvm
);
8110 if (kvm_x86_ops
->vm_init
)
8111 return kvm_x86_ops
->vm_init(kvm
);
8116 static void kvm_unload_vcpu_mmu(struct kvm_vcpu
*vcpu
)
8119 r
= vcpu_load(vcpu
);
8121 kvm_mmu_unload(vcpu
);
8125 static void kvm_free_vcpus(struct kvm
*kvm
)
8128 struct kvm_vcpu
*vcpu
;
8131 * Unpin any mmu pages first.
8133 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
8134 kvm_clear_async_pf_completion_queue(vcpu
);
8135 kvm_unload_vcpu_mmu(vcpu
);
8137 kvm_for_each_vcpu(i
, vcpu
, kvm
)
8138 kvm_arch_vcpu_free(vcpu
);
8140 mutex_lock(&kvm
->lock
);
8141 for (i
= 0; i
< atomic_read(&kvm
->online_vcpus
); i
++)
8142 kvm
->vcpus
[i
] = NULL
;
8144 atomic_set(&kvm
->online_vcpus
, 0);
8145 mutex_unlock(&kvm
->lock
);
8148 void kvm_arch_sync_events(struct kvm
*kvm
)
8150 cancel_delayed_work_sync(&kvm
->arch
.kvmclock_sync_work
);
8151 cancel_delayed_work_sync(&kvm
->arch
.kvmclock_update_work
);
8155 int __x86_set_memory_region(struct kvm
*kvm
, int id
, gpa_t gpa
, u32 size
)
8159 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
8160 struct kvm_memory_slot
*slot
, old
;
8162 /* Called with kvm->slots_lock held. */
8163 if (WARN_ON(id
>= KVM_MEM_SLOTS_NUM
))
8166 slot
= id_to_memslot(slots
, id
);
8172 * MAP_SHARED to prevent internal slot pages from being moved
8175 hva
= vm_mmap(NULL
, 0, size
, PROT_READ
| PROT_WRITE
,
8176 MAP_SHARED
| MAP_ANONYMOUS
, 0);
8177 if (IS_ERR((void *)hva
))
8178 return PTR_ERR((void *)hva
);
8187 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
8188 struct kvm_userspace_memory_region m
;
8190 m
.slot
= id
| (i
<< 16);
8192 m
.guest_phys_addr
= gpa
;
8193 m
.userspace_addr
= hva
;
8194 m
.memory_size
= size
;
8195 r
= __kvm_set_memory_region(kvm
, &m
);
8201 r
= vm_munmap(old
.userspace_addr
, old
.npages
* PAGE_SIZE
);
8207 EXPORT_SYMBOL_GPL(__x86_set_memory_region
);
8209 int x86_set_memory_region(struct kvm
*kvm
, int id
, gpa_t gpa
, u32 size
)
8213 mutex_lock(&kvm
->slots_lock
);
8214 r
= __x86_set_memory_region(kvm
, id
, gpa
, size
);
8215 mutex_unlock(&kvm
->slots_lock
);
8219 EXPORT_SYMBOL_GPL(x86_set_memory_region
);
8221 void kvm_arch_destroy_vm(struct kvm
*kvm
)
8223 if (current
->mm
== kvm
->mm
) {
8225 * Free memory regions allocated on behalf of userspace,
8226 * unless the the memory map has changed due to process exit
8229 x86_set_memory_region(kvm
, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT
, 0, 0);
8230 x86_set_memory_region(kvm
, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT
, 0, 0);
8231 x86_set_memory_region(kvm
, TSS_PRIVATE_MEMSLOT
, 0, 0);
8233 if (kvm_x86_ops
->vm_destroy
)
8234 kvm_x86_ops
->vm_destroy(kvm
);
8235 kvm_pic_destroy(kvm
);
8236 kvm_ioapic_destroy(kvm
);
8237 kvm_free_vcpus(kvm
);
8238 kvfree(rcu_dereference_check(kvm
->arch
.apic_map
, 1));
8239 kvm_mmu_uninit_vm(kvm
);
8240 kvm_page_track_cleanup(kvm
);
8243 void kvm_arch_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
8244 struct kvm_memory_slot
*dont
)
8248 for (i
= 0; i
< KVM_NR_PAGE_SIZES
; ++i
) {
8249 if (!dont
|| free
->arch
.rmap
[i
] != dont
->arch
.rmap
[i
]) {
8250 kvfree(free
->arch
.rmap
[i
]);
8251 free
->arch
.rmap
[i
] = NULL
;
8256 if (!dont
|| free
->arch
.lpage_info
[i
- 1] !=
8257 dont
->arch
.lpage_info
[i
- 1]) {
8258 kvfree(free
->arch
.lpage_info
[i
- 1]);
8259 free
->arch
.lpage_info
[i
- 1] = NULL
;
8263 kvm_page_track_free_memslot(free
, dont
);
8266 int kvm_arch_create_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*slot
,
8267 unsigned long npages
)
8271 for (i
= 0; i
< KVM_NR_PAGE_SIZES
; ++i
) {
8272 struct kvm_lpage_info
*linfo
;
8277 lpages
= gfn_to_index(slot
->base_gfn
+ npages
- 1,
8278 slot
->base_gfn
, level
) + 1;
8280 slot
->arch
.rmap
[i
] =
8281 kvzalloc(lpages
* sizeof(*slot
->arch
.rmap
[i
]), GFP_KERNEL
);
8282 if (!slot
->arch
.rmap
[i
])
8287 linfo
= kvzalloc(lpages
* sizeof(*linfo
), GFP_KERNEL
);
8291 slot
->arch
.lpage_info
[i
- 1] = linfo
;
8293 if (slot
->base_gfn
& (KVM_PAGES_PER_HPAGE(level
) - 1))
8294 linfo
[0].disallow_lpage
= 1;
8295 if ((slot
->base_gfn
+ npages
) & (KVM_PAGES_PER_HPAGE(level
) - 1))
8296 linfo
[lpages
- 1].disallow_lpage
= 1;
8297 ugfn
= slot
->userspace_addr
>> PAGE_SHIFT
;
8299 * If the gfn and userspace address are not aligned wrt each
8300 * other, or if explicitly asked to, disable large page
8301 * support for this slot
8303 if ((slot
->base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
8304 !kvm_largepages_enabled()) {
8307 for (j
= 0; j
< lpages
; ++j
)
8308 linfo
[j
].disallow_lpage
= 1;
8312 if (kvm_page_track_create_memslot(slot
, npages
))
8318 for (i
= 0; i
< KVM_NR_PAGE_SIZES
; ++i
) {
8319 kvfree(slot
->arch
.rmap
[i
]);
8320 slot
->arch
.rmap
[i
] = NULL
;
8324 kvfree(slot
->arch
.lpage_info
[i
- 1]);
8325 slot
->arch
.lpage_info
[i
- 1] = NULL
;
8330 void kvm_arch_memslots_updated(struct kvm
*kvm
, struct kvm_memslots
*slots
)
8333 * memslots->generation has been incremented.
8334 * mmio generation may have reached its maximum value.
8336 kvm_mmu_invalidate_mmio_sptes(kvm
, slots
);
8339 int kvm_arch_prepare_memory_region(struct kvm
*kvm
,
8340 struct kvm_memory_slot
*memslot
,
8341 const struct kvm_userspace_memory_region
*mem
,
8342 enum kvm_mr_change change
)
8347 static void kvm_mmu_slot_apply_flags(struct kvm
*kvm
,
8348 struct kvm_memory_slot
*new)
8350 /* Still write protect RO slot */
8351 if (new->flags
& KVM_MEM_READONLY
) {
8352 kvm_mmu_slot_remove_write_access(kvm
, new);
8357 * Call kvm_x86_ops dirty logging hooks when they are valid.
8359 * kvm_x86_ops->slot_disable_log_dirty is called when:
8361 * - KVM_MR_CREATE with dirty logging is disabled
8362 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag
8364 * The reason is, in case of PML, we need to set D-bit for any slots
8365 * with dirty logging disabled in order to eliminate unnecessary GPA
8366 * logging in PML buffer (and potential PML buffer full VMEXT). This
8367 * guarantees leaving PML enabled during guest's lifetime won't have
8368 * any additonal overhead from PML when guest is running with dirty
8369 * logging disabled for memory slots.
8371 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot
8372 * to dirty logging mode.
8374 * If kvm_x86_ops dirty logging hooks are invalid, use write protect.
8376 * In case of write protect:
8378 * Write protect all pages for dirty logging.
8380 * All the sptes including the large sptes which point to this
8381 * slot are set to readonly. We can not create any new large
8382 * spte on this slot until the end of the logging.
8384 * See the comments in fast_page_fault().
8386 if (new->flags
& KVM_MEM_LOG_DIRTY_PAGES
) {
8387 if (kvm_x86_ops
->slot_enable_log_dirty
)
8388 kvm_x86_ops
->slot_enable_log_dirty(kvm
, new);
8390 kvm_mmu_slot_remove_write_access(kvm
, new);
8392 if (kvm_x86_ops
->slot_disable_log_dirty
)
8393 kvm_x86_ops
->slot_disable_log_dirty(kvm
, new);
8397 void kvm_arch_commit_memory_region(struct kvm
*kvm
,
8398 const struct kvm_userspace_memory_region
*mem
,
8399 const struct kvm_memory_slot
*old
,
8400 const struct kvm_memory_slot
*new,
8401 enum kvm_mr_change change
)
8403 int nr_mmu_pages
= 0;
8405 if (!kvm
->arch
.n_requested_mmu_pages
)
8406 nr_mmu_pages
= kvm_mmu_calculate_mmu_pages(kvm
);
8409 kvm_mmu_change_mmu_pages(kvm
, nr_mmu_pages
);
8412 * Dirty logging tracks sptes in 4k granularity, meaning that large
8413 * sptes have to be split. If live migration is successful, the guest
8414 * in the source machine will be destroyed and large sptes will be
8415 * created in the destination. However, if the guest continues to run
8416 * in the source machine (for example if live migration fails), small
8417 * sptes will remain around and cause bad performance.
8419 * Scan sptes if dirty logging has been stopped, dropping those
8420 * which can be collapsed into a single large-page spte. Later
8421 * page faults will create the large-page sptes.
8423 if ((change
!= KVM_MR_DELETE
) &&
8424 (old
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) &&
8425 !(new->flags
& KVM_MEM_LOG_DIRTY_PAGES
))
8426 kvm_mmu_zap_collapsible_sptes(kvm
, new);
8429 * Set up write protection and/or dirty logging for the new slot.
8431 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have
8432 * been zapped so no dirty logging staff is needed for old slot. For
8433 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the
8434 * new and it's also covered when dealing with the new slot.
8436 * FIXME: const-ify all uses of struct kvm_memory_slot.
8438 if (change
!= KVM_MR_DELETE
)
8439 kvm_mmu_slot_apply_flags(kvm
, (struct kvm_memory_slot
*) new);
8442 void kvm_arch_flush_shadow_all(struct kvm
*kvm
)
8444 kvm_mmu_invalidate_zap_all_pages(kvm
);
8447 void kvm_arch_flush_shadow_memslot(struct kvm
*kvm
,
8448 struct kvm_memory_slot
*slot
)
8450 kvm_page_track_flush_slot(kvm
, slot
);
8453 static inline bool kvm_vcpu_has_events(struct kvm_vcpu
*vcpu
)
8455 if (!list_empty_careful(&vcpu
->async_pf
.done
))
8458 if (kvm_apic_has_events(vcpu
))
8461 if (vcpu
->arch
.pv
.pv_unhalted
)
8464 if (kvm_test_request(KVM_REQ_NMI
, vcpu
) ||
8465 (vcpu
->arch
.nmi_pending
&&
8466 kvm_x86_ops
->nmi_allowed(vcpu
)))
8469 if (kvm_test_request(KVM_REQ_SMI
, vcpu
) ||
8470 (vcpu
->arch
.smi_pending
&& !is_smm(vcpu
)))
8473 if (kvm_arch_interrupt_allowed(vcpu
) &&
8474 kvm_cpu_has_interrupt(vcpu
))
8477 if (kvm_hv_has_stimer_pending(vcpu
))
8483 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*vcpu
)
8485 return kvm_vcpu_running(vcpu
) || kvm_vcpu_has_events(vcpu
);
8488 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu
*vcpu
)
8490 return vcpu
->arch
.preempted_in_kernel
;
8493 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
8495 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
8498 int kvm_arch_interrupt_allowed(struct kvm_vcpu
*vcpu
)
8500 return kvm_x86_ops
->interrupt_allowed(vcpu
);
8503 unsigned long kvm_get_linear_rip(struct kvm_vcpu
*vcpu
)
8505 if (is_64_bit_mode(vcpu
))
8506 return kvm_rip_read(vcpu
);
8507 return (u32
)(get_segment_base(vcpu
, VCPU_SREG_CS
) +
8508 kvm_rip_read(vcpu
));
8510 EXPORT_SYMBOL_GPL(kvm_get_linear_rip
);
8512 bool kvm_is_linear_rip(struct kvm_vcpu
*vcpu
, unsigned long linear_rip
)
8514 return kvm_get_linear_rip(vcpu
) == linear_rip
;
8516 EXPORT_SYMBOL_GPL(kvm_is_linear_rip
);
8518 unsigned long kvm_get_rflags(struct kvm_vcpu
*vcpu
)
8520 unsigned long rflags
;
8522 rflags
= kvm_x86_ops
->get_rflags(vcpu
);
8523 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
)
8524 rflags
&= ~X86_EFLAGS_TF
;
8527 EXPORT_SYMBOL_GPL(kvm_get_rflags
);
8529 static void __kvm_set_rflags(struct kvm_vcpu
*vcpu
, unsigned long rflags
)
8531 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
&&
8532 kvm_is_linear_rip(vcpu
, vcpu
->arch
.singlestep_rip
))
8533 rflags
|= X86_EFLAGS_TF
;
8534 kvm_x86_ops
->set_rflags(vcpu
, rflags
);
8537 void kvm_set_rflags(struct kvm_vcpu
*vcpu
, unsigned long rflags
)
8539 __kvm_set_rflags(vcpu
, rflags
);
8540 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
8542 EXPORT_SYMBOL_GPL(kvm_set_rflags
);
8544 void kvm_arch_async_page_ready(struct kvm_vcpu
*vcpu
, struct kvm_async_pf
*work
)
8548 if ((vcpu
->arch
.mmu
.direct_map
!= work
->arch
.direct_map
) ||
8552 r
= kvm_mmu_reload(vcpu
);
8556 if (!vcpu
->arch
.mmu
.direct_map
&&
8557 work
->arch
.cr3
!= vcpu
->arch
.mmu
.get_cr3(vcpu
))
8560 vcpu
->arch
.mmu
.page_fault(vcpu
, work
->gva
, 0, true);
8563 static inline u32
kvm_async_pf_hash_fn(gfn_t gfn
)
8565 return hash_32(gfn
& 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU
));
8568 static inline u32
kvm_async_pf_next_probe(u32 key
)
8570 return (key
+ 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU
) - 1);
8573 static void kvm_add_async_pf_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8575 u32 key
= kvm_async_pf_hash_fn(gfn
);
8577 while (vcpu
->arch
.apf
.gfns
[key
] != ~0)
8578 key
= kvm_async_pf_next_probe(key
);
8580 vcpu
->arch
.apf
.gfns
[key
] = gfn
;
8583 static u32
kvm_async_pf_gfn_slot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8586 u32 key
= kvm_async_pf_hash_fn(gfn
);
8588 for (i
= 0; i
< roundup_pow_of_two(ASYNC_PF_PER_VCPU
) &&
8589 (vcpu
->arch
.apf
.gfns
[key
] != gfn
&&
8590 vcpu
->arch
.apf
.gfns
[key
] != ~0); i
++)
8591 key
= kvm_async_pf_next_probe(key
);
8596 bool kvm_find_async_pf_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8598 return vcpu
->arch
.apf
.gfns
[kvm_async_pf_gfn_slot(vcpu
, gfn
)] == gfn
;
8601 static void kvm_del_async_pf_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8605 i
= j
= kvm_async_pf_gfn_slot(vcpu
, gfn
);
8607 vcpu
->arch
.apf
.gfns
[i
] = ~0;
8609 j
= kvm_async_pf_next_probe(j
);
8610 if (vcpu
->arch
.apf
.gfns
[j
] == ~0)
8612 k
= kvm_async_pf_hash_fn(vcpu
->arch
.apf
.gfns
[j
]);
8614 * k lies cyclically in ]i,j]
8616 * |....j i.k.| or |.k..j i...|
8618 } while ((i
<= j
) ? (i
< k
&& k
<= j
) : (i
< k
|| k
<= j
));
8619 vcpu
->arch
.apf
.gfns
[i
] = vcpu
->arch
.apf
.gfns
[j
];
8624 static int apf_put_user(struct kvm_vcpu
*vcpu
, u32 val
)
8627 return kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.apf
.data
, &val
,
8631 void kvm_arch_async_page_not_present(struct kvm_vcpu
*vcpu
,
8632 struct kvm_async_pf
*work
)
8634 struct x86_exception fault
;
8636 trace_kvm_async_pf_not_present(work
->arch
.token
, work
->gva
);
8637 kvm_add_async_pf_gfn(vcpu
, work
->arch
.gfn
);
8639 if (!(vcpu
->arch
.apf
.msr_val
& KVM_ASYNC_PF_ENABLED
) ||
8640 (vcpu
->arch
.apf
.send_user_only
&&
8641 kvm_x86_ops
->get_cpl(vcpu
) == 0))
8642 kvm_make_request(KVM_REQ_APF_HALT
, vcpu
);
8643 else if (!apf_put_user(vcpu
, KVM_PV_REASON_PAGE_NOT_PRESENT
)) {
8644 fault
.vector
= PF_VECTOR
;
8645 fault
.error_code_valid
= true;
8646 fault
.error_code
= 0;
8647 fault
.nested_page_fault
= false;
8648 fault
.address
= work
->arch
.token
;
8649 fault
.async_page_fault
= true;
8650 kvm_inject_page_fault(vcpu
, &fault
);
8654 void kvm_arch_async_page_present(struct kvm_vcpu
*vcpu
,
8655 struct kvm_async_pf
*work
)
8657 struct x86_exception fault
;
8659 if (work
->wakeup_all
)
8660 work
->arch
.token
= ~0; /* broadcast wakeup */
8662 kvm_del_async_pf_gfn(vcpu
, work
->arch
.gfn
);
8663 trace_kvm_async_pf_ready(work
->arch
.token
, work
->gva
);
8665 if ((vcpu
->arch
.apf
.msr_val
& KVM_ASYNC_PF_ENABLED
) &&
8666 !apf_put_user(vcpu
, KVM_PV_REASON_PAGE_READY
)) {
8667 fault
.vector
= PF_VECTOR
;
8668 fault
.error_code_valid
= true;
8669 fault
.error_code
= 0;
8670 fault
.nested_page_fault
= false;
8671 fault
.address
= work
->arch
.token
;
8672 fault
.async_page_fault
= true;
8673 kvm_inject_page_fault(vcpu
, &fault
);
8675 vcpu
->arch
.apf
.halted
= false;
8676 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
8679 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu
*vcpu
)
8681 if (!(vcpu
->arch
.apf
.msr_val
& KVM_ASYNC_PF_ENABLED
))
8684 return kvm_can_do_async_pf(vcpu
);
8687 void kvm_arch_start_assignment(struct kvm
*kvm
)
8689 atomic_inc(&kvm
->arch
.assigned_device_count
);
8691 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment
);
8693 void kvm_arch_end_assignment(struct kvm
*kvm
)
8695 atomic_dec(&kvm
->arch
.assigned_device_count
);
8697 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment
);
8699 bool kvm_arch_has_assigned_device(struct kvm
*kvm
)
8701 return atomic_read(&kvm
->arch
.assigned_device_count
);
8703 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device
);
8705 void kvm_arch_register_noncoherent_dma(struct kvm
*kvm
)
8707 atomic_inc(&kvm
->arch
.noncoherent_dma_count
);
8709 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma
);
8711 void kvm_arch_unregister_noncoherent_dma(struct kvm
*kvm
)
8713 atomic_dec(&kvm
->arch
.noncoherent_dma_count
);
8715 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma
);
8717 bool kvm_arch_has_noncoherent_dma(struct kvm
*kvm
)
8719 return atomic_read(&kvm
->arch
.noncoherent_dma_count
);
8721 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma
);
8723 bool kvm_arch_has_irq_bypass(void)
8725 return kvm_x86_ops
->update_pi_irte
!= NULL
;
8728 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer
*cons
,
8729 struct irq_bypass_producer
*prod
)
8731 struct kvm_kernel_irqfd
*irqfd
=
8732 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
8734 irqfd
->producer
= prod
;
8736 return kvm_x86_ops
->update_pi_irte(irqfd
->kvm
,
8737 prod
->irq
, irqfd
->gsi
, 1);
8740 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer
*cons
,
8741 struct irq_bypass_producer
*prod
)
8744 struct kvm_kernel_irqfd
*irqfd
=
8745 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
8747 WARN_ON(irqfd
->producer
!= prod
);
8748 irqfd
->producer
= NULL
;
8751 * When producer of consumer is unregistered, we change back to
8752 * remapped mode, so we can re-use the current implementation
8753 * when the irq is masked/disabled or the consumer side (KVM
8754 * int this case doesn't want to receive the interrupts.
8756 ret
= kvm_x86_ops
->update_pi_irte(irqfd
->kvm
, prod
->irq
, irqfd
->gsi
, 0);
8758 printk(KERN_INFO
"irq bypass consumer (token %p) unregistration"
8759 " fails: %d\n", irqfd
->consumer
.token
, ret
);
8762 int kvm_arch_update_irqfd_routing(struct kvm
*kvm
, unsigned int host_irq
,
8763 uint32_t guest_irq
, bool set
)
8765 if (!kvm_x86_ops
->update_pi_irte
)
8768 return kvm_x86_ops
->update_pi_irte(kvm
, host_irq
, guest_irq
, set
);
8771 bool kvm_vector_hashing_enabled(void)
8773 return vector_hashing
;
8775 EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled
);
8777 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit
);
8778 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio
);
8779 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq
);
8780 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault
);
8781 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr
);
8782 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr
);
8783 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun
);
8784 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit
);
8785 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject
);
8786 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit
);
8787 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga
);
8788 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit
);
8789 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts
);
8790 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset
);
8791 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window
);
8792 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full
);
8793 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update
);
8794 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access
);
8795 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi
);