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"
30 #include "assigned-dev.h"
34 #include <linux/clocksource.h>
35 #include <linux/interrupt.h>
36 #include <linux/kvm.h>
38 #include <linux/vmalloc.h>
39 #include <linux/module.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 <trace/events/kvm.h>
58 #define CREATE_TRACE_POINTS
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 MAX_IO_MSRS 256
72 #define KVM_MAX_MCE_BANKS 32
73 #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
75 #define emul_to_vcpu(ctxt) \
76 container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
79 * - enable syscall per default because its emulated by KVM
80 * - enable LME and LMA per default on 64 bit KVM
84 u64 __read_mostly efer_reserved_bits
= ~((u64
)(EFER_SCE
| EFER_LME
| EFER_LMA
));
86 static u64 __read_mostly efer_reserved_bits
= ~((u64
)EFER_SCE
);
89 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
90 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
92 static void update_cr8_intercept(struct kvm_vcpu
*vcpu
);
93 static void process_nmi(struct kvm_vcpu
*vcpu
);
94 static void __kvm_set_rflags(struct kvm_vcpu
*vcpu
, unsigned long rflags
);
96 struct kvm_x86_ops
*kvm_x86_ops __read_mostly
;
97 EXPORT_SYMBOL_GPL(kvm_x86_ops
);
99 static bool __read_mostly ignore_msrs
= 0;
100 module_param(ignore_msrs
, bool, S_IRUGO
| S_IWUSR
);
102 unsigned int min_timer_period_us
= 500;
103 module_param(min_timer_period_us
, uint
, S_IRUGO
| S_IWUSR
);
105 static bool __read_mostly kvmclock_periodic_sync
= true;
106 module_param(kvmclock_periodic_sync
, bool, S_IRUGO
);
108 bool __read_mostly kvm_has_tsc_control
;
109 EXPORT_SYMBOL_GPL(kvm_has_tsc_control
);
110 u32 __read_mostly kvm_max_guest_tsc_khz
;
111 EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz
);
112 u8 __read_mostly kvm_tsc_scaling_ratio_frac_bits
;
113 EXPORT_SYMBOL_GPL(kvm_tsc_scaling_ratio_frac_bits
);
114 u64 __read_mostly kvm_max_tsc_scaling_ratio
;
115 EXPORT_SYMBOL_GPL(kvm_max_tsc_scaling_ratio
);
116 static u64 __read_mostly kvm_default_tsc_scaling_ratio
;
118 /* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
119 static u32 __read_mostly tsc_tolerance_ppm
= 250;
120 module_param(tsc_tolerance_ppm
, uint
, S_IRUGO
| S_IWUSR
);
122 /* lapic timer advance (tscdeadline mode only) in nanoseconds */
123 unsigned int __read_mostly lapic_timer_advance_ns
= 0;
124 module_param(lapic_timer_advance_ns
, uint
, S_IRUGO
| S_IWUSR
);
126 static bool __read_mostly vector_hashing
= true;
127 module_param(vector_hashing
, bool, S_IRUGO
);
129 static bool __read_mostly backwards_tsc_observed
= false;
131 #define KVM_NR_SHARED_MSRS 16
133 struct kvm_shared_msrs_global
{
135 u32 msrs
[KVM_NR_SHARED_MSRS
];
138 struct kvm_shared_msrs
{
139 struct user_return_notifier urn
;
141 struct kvm_shared_msr_values
{
144 } values
[KVM_NR_SHARED_MSRS
];
147 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global
;
148 static struct kvm_shared_msrs __percpu
*shared_msrs
;
150 struct kvm_stats_debugfs_item debugfs_entries
[] = {
151 { "pf_fixed", VCPU_STAT(pf_fixed
) },
152 { "pf_guest", VCPU_STAT(pf_guest
) },
153 { "tlb_flush", VCPU_STAT(tlb_flush
) },
154 { "invlpg", VCPU_STAT(invlpg
) },
155 { "exits", VCPU_STAT(exits
) },
156 { "io_exits", VCPU_STAT(io_exits
) },
157 { "mmio_exits", VCPU_STAT(mmio_exits
) },
158 { "signal_exits", VCPU_STAT(signal_exits
) },
159 { "irq_window", VCPU_STAT(irq_window_exits
) },
160 { "nmi_window", VCPU_STAT(nmi_window_exits
) },
161 { "halt_exits", VCPU_STAT(halt_exits
) },
162 { "halt_successful_poll", VCPU_STAT(halt_successful_poll
) },
163 { "halt_attempted_poll", VCPU_STAT(halt_attempted_poll
) },
164 { "halt_poll_invalid", VCPU_STAT(halt_poll_invalid
) },
165 { "halt_wakeup", VCPU_STAT(halt_wakeup
) },
166 { "hypercalls", VCPU_STAT(hypercalls
) },
167 { "request_irq", VCPU_STAT(request_irq_exits
) },
168 { "irq_exits", VCPU_STAT(irq_exits
) },
169 { "host_state_reload", VCPU_STAT(host_state_reload
) },
170 { "efer_reload", VCPU_STAT(efer_reload
) },
171 { "fpu_reload", VCPU_STAT(fpu_reload
) },
172 { "insn_emulation", VCPU_STAT(insn_emulation
) },
173 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail
) },
174 { "irq_injections", VCPU_STAT(irq_injections
) },
175 { "nmi_injections", VCPU_STAT(nmi_injections
) },
176 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped
) },
177 { "mmu_pte_write", VM_STAT(mmu_pte_write
) },
178 { "mmu_pte_updated", VM_STAT(mmu_pte_updated
) },
179 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped
) },
180 { "mmu_flooded", VM_STAT(mmu_flooded
) },
181 { "mmu_recycled", VM_STAT(mmu_recycled
) },
182 { "mmu_cache_miss", VM_STAT(mmu_cache_miss
) },
183 { "mmu_unsync", VM_STAT(mmu_unsync
) },
184 { "remote_tlb_flush", VM_STAT(remote_tlb_flush
) },
185 { "largepages", VM_STAT(lpages
) },
189 u64 __read_mostly host_xcr0
;
191 static int emulator_fix_hypercall(struct x86_emulate_ctxt
*ctxt
);
193 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu
*vcpu
)
196 for (i
= 0; i
< roundup_pow_of_two(ASYNC_PF_PER_VCPU
); i
++)
197 vcpu
->arch
.apf
.gfns
[i
] = ~0;
200 static void kvm_on_user_return(struct user_return_notifier
*urn
)
203 struct kvm_shared_msrs
*locals
204 = container_of(urn
, struct kvm_shared_msrs
, urn
);
205 struct kvm_shared_msr_values
*values
;
207 for (slot
= 0; slot
< shared_msrs_global
.nr
; ++slot
) {
208 values
= &locals
->values
[slot
];
209 if (values
->host
!= values
->curr
) {
210 wrmsrl(shared_msrs_global
.msrs
[slot
], values
->host
);
211 values
->curr
= values
->host
;
214 locals
->registered
= false;
215 user_return_notifier_unregister(urn
);
218 static void shared_msr_update(unsigned slot
, u32 msr
)
221 unsigned int cpu
= smp_processor_id();
222 struct kvm_shared_msrs
*smsr
= per_cpu_ptr(shared_msrs
, cpu
);
224 /* only read, and nobody should modify it at this time,
225 * so don't need lock */
226 if (slot
>= shared_msrs_global
.nr
) {
227 printk(KERN_ERR
"kvm: invalid MSR slot!");
230 rdmsrl_safe(msr
, &value
);
231 smsr
->values
[slot
].host
= value
;
232 smsr
->values
[slot
].curr
= value
;
235 void kvm_define_shared_msr(unsigned slot
, u32 msr
)
237 BUG_ON(slot
>= KVM_NR_SHARED_MSRS
);
238 shared_msrs_global
.msrs
[slot
] = msr
;
239 if (slot
>= shared_msrs_global
.nr
)
240 shared_msrs_global
.nr
= slot
+ 1;
242 EXPORT_SYMBOL_GPL(kvm_define_shared_msr
);
244 static void kvm_shared_msr_cpu_online(void)
248 for (i
= 0; i
< shared_msrs_global
.nr
; ++i
)
249 shared_msr_update(i
, shared_msrs_global
.msrs
[i
]);
252 int kvm_set_shared_msr(unsigned slot
, u64 value
, u64 mask
)
254 unsigned int cpu
= smp_processor_id();
255 struct kvm_shared_msrs
*smsr
= per_cpu_ptr(shared_msrs
, cpu
);
258 if (((value
^ smsr
->values
[slot
].curr
) & mask
) == 0)
260 smsr
->values
[slot
].curr
= value
;
261 err
= wrmsrl_safe(shared_msrs_global
.msrs
[slot
], value
);
265 if (!smsr
->registered
) {
266 smsr
->urn
.on_user_return
= kvm_on_user_return
;
267 user_return_notifier_register(&smsr
->urn
);
268 smsr
->registered
= true;
272 EXPORT_SYMBOL_GPL(kvm_set_shared_msr
);
274 static void drop_user_return_notifiers(void)
276 unsigned int cpu
= smp_processor_id();
277 struct kvm_shared_msrs
*smsr
= per_cpu_ptr(shared_msrs
, cpu
);
279 if (smsr
->registered
)
280 kvm_on_user_return(&smsr
->urn
);
283 u64
kvm_get_apic_base(struct kvm_vcpu
*vcpu
)
285 return vcpu
->arch
.apic_base
;
287 EXPORT_SYMBOL_GPL(kvm_get_apic_base
);
289 int kvm_set_apic_base(struct kvm_vcpu
*vcpu
, struct msr_data
*msr_info
)
291 u64 old_state
= vcpu
->arch
.apic_base
&
292 (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
);
293 u64 new_state
= msr_info
->data
&
294 (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
);
295 u64 reserved_bits
= ((~0ULL) << cpuid_maxphyaddr(vcpu
)) |
296 0x2ff | (guest_cpuid_has_x2apic(vcpu
) ? 0 : X2APIC_ENABLE
);
298 if (!msr_info
->host_initiated
&&
299 ((msr_info
->data
& reserved_bits
) != 0 ||
300 new_state
== X2APIC_ENABLE
||
301 (new_state
== MSR_IA32_APICBASE_ENABLE
&&
302 old_state
== (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
)) ||
303 (new_state
== (MSR_IA32_APICBASE_ENABLE
| X2APIC_ENABLE
) &&
307 kvm_lapic_set_base(vcpu
, msr_info
->data
);
310 EXPORT_SYMBOL_GPL(kvm_set_apic_base
);
312 asmlinkage __visible
void kvm_spurious_fault(void)
314 /* Fault while not rebooting. We want the trace. */
317 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
319 #define EXCPT_BENIGN 0
320 #define EXCPT_CONTRIBUTORY 1
323 static int exception_class(int vector
)
333 return EXCPT_CONTRIBUTORY
;
340 #define EXCPT_FAULT 0
342 #define EXCPT_ABORT 2
343 #define EXCPT_INTERRUPT 3
345 static int exception_type(int vector
)
349 if (WARN_ON(vector
> 31 || vector
== NMI_VECTOR
))
350 return EXCPT_INTERRUPT
;
354 /* #DB is trap, as instruction watchpoints are handled elsewhere */
355 if (mask
& ((1 << DB_VECTOR
) | (1 << BP_VECTOR
) | (1 << OF_VECTOR
)))
358 if (mask
& ((1 << DF_VECTOR
) | (1 << MC_VECTOR
)))
361 /* Reserved exceptions will result in fault */
365 static void kvm_multiple_exception(struct kvm_vcpu
*vcpu
,
366 unsigned nr
, bool has_error
, u32 error_code
,
372 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
374 if (!vcpu
->arch
.exception
.pending
) {
376 if (has_error
&& !is_protmode(vcpu
))
378 vcpu
->arch
.exception
.pending
= true;
379 vcpu
->arch
.exception
.has_error_code
= has_error
;
380 vcpu
->arch
.exception
.nr
= nr
;
381 vcpu
->arch
.exception
.error_code
= error_code
;
382 vcpu
->arch
.exception
.reinject
= reinject
;
386 /* to check exception */
387 prev_nr
= vcpu
->arch
.exception
.nr
;
388 if (prev_nr
== DF_VECTOR
) {
389 /* triple fault -> shutdown */
390 kvm_make_request(KVM_REQ_TRIPLE_FAULT
, vcpu
);
393 class1
= exception_class(prev_nr
);
394 class2
= exception_class(nr
);
395 if ((class1
== EXCPT_CONTRIBUTORY
&& class2
== EXCPT_CONTRIBUTORY
)
396 || (class1
== EXCPT_PF
&& class2
!= EXCPT_BENIGN
)) {
397 /* generate double fault per SDM Table 5-5 */
398 vcpu
->arch
.exception
.pending
= true;
399 vcpu
->arch
.exception
.has_error_code
= true;
400 vcpu
->arch
.exception
.nr
= DF_VECTOR
;
401 vcpu
->arch
.exception
.error_code
= 0;
403 /* replace previous exception with a new one in a hope
404 that instruction re-execution will regenerate lost
409 void kvm_queue_exception(struct kvm_vcpu
*vcpu
, unsigned nr
)
411 kvm_multiple_exception(vcpu
, nr
, false, 0, false);
413 EXPORT_SYMBOL_GPL(kvm_queue_exception
);
415 void kvm_requeue_exception(struct kvm_vcpu
*vcpu
, unsigned nr
)
417 kvm_multiple_exception(vcpu
, nr
, false, 0, true);
419 EXPORT_SYMBOL_GPL(kvm_requeue_exception
);
421 void kvm_complete_insn_gp(struct kvm_vcpu
*vcpu
, int err
)
424 kvm_inject_gp(vcpu
, 0);
426 kvm_x86_ops
->skip_emulated_instruction(vcpu
);
428 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp
);
430 void kvm_inject_page_fault(struct kvm_vcpu
*vcpu
, struct x86_exception
*fault
)
432 ++vcpu
->stat
.pf_guest
;
433 vcpu
->arch
.cr2
= fault
->address
;
434 kvm_queue_exception_e(vcpu
, PF_VECTOR
, fault
->error_code
);
436 EXPORT_SYMBOL_GPL(kvm_inject_page_fault
);
438 static bool kvm_propagate_fault(struct kvm_vcpu
*vcpu
, struct x86_exception
*fault
)
440 if (mmu_is_nested(vcpu
) && !fault
->nested_page_fault
)
441 vcpu
->arch
.nested_mmu
.inject_page_fault(vcpu
, fault
);
443 vcpu
->arch
.mmu
.inject_page_fault(vcpu
, fault
);
445 return fault
->nested_page_fault
;
448 void kvm_inject_nmi(struct kvm_vcpu
*vcpu
)
450 atomic_inc(&vcpu
->arch
.nmi_queued
);
451 kvm_make_request(KVM_REQ_NMI
, vcpu
);
453 EXPORT_SYMBOL_GPL(kvm_inject_nmi
);
455 void kvm_queue_exception_e(struct kvm_vcpu
*vcpu
, unsigned nr
, u32 error_code
)
457 kvm_multiple_exception(vcpu
, nr
, true, error_code
, false);
459 EXPORT_SYMBOL_GPL(kvm_queue_exception_e
);
461 void kvm_requeue_exception_e(struct kvm_vcpu
*vcpu
, unsigned nr
, u32 error_code
)
463 kvm_multiple_exception(vcpu
, nr
, true, error_code
, true);
465 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e
);
468 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
469 * a #GP and return false.
471 bool kvm_require_cpl(struct kvm_vcpu
*vcpu
, int required_cpl
)
473 if (kvm_x86_ops
->get_cpl(vcpu
) <= required_cpl
)
475 kvm_queue_exception_e(vcpu
, GP_VECTOR
, 0);
478 EXPORT_SYMBOL_GPL(kvm_require_cpl
);
480 bool kvm_require_dr(struct kvm_vcpu
*vcpu
, int dr
)
482 if ((dr
!= 4 && dr
!= 5) || !kvm_read_cr4_bits(vcpu
, X86_CR4_DE
))
485 kvm_queue_exception(vcpu
, UD_VECTOR
);
488 EXPORT_SYMBOL_GPL(kvm_require_dr
);
491 * This function will be used to read from the physical memory of the currently
492 * running guest. The difference to kvm_vcpu_read_guest_page is that this function
493 * can read from guest physical or from the guest's guest physical memory.
495 int kvm_read_guest_page_mmu(struct kvm_vcpu
*vcpu
, struct kvm_mmu
*mmu
,
496 gfn_t ngfn
, void *data
, int offset
, int len
,
499 struct x86_exception exception
;
503 ngpa
= gfn_to_gpa(ngfn
);
504 real_gfn
= mmu
->translate_gpa(vcpu
, ngpa
, access
, &exception
);
505 if (real_gfn
== UNMAPPED_GVA
)
508 real_gfn
= gpa_to_gfn(real_gfn
);
510 return kvm_vcpu_read_guest_page(vcpu
, real_gfn
, data
, offset
, len
);
512 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu
);
514 static int kvm_read_nested_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
515 void *data
, int offset
, int len
, u32 access
)
517 return kvm_read_guest_page_mmu(vcpu
, vcpu
->arch
.walk_mmu
, gfn
,
518 data
, offset
, len
, access
);
522 * Load the pae pdptrs. Return true is they are all valid.
524 int load_pdptrs(struct kvm_vcpu
*vcpu
, struct kvm_mmu
*mmu
, unsigned long cr3
)
526 gfn_t pdpt_gfn
= cr3
>> PAGE_SHIFT
;
527 unsigned offset
= ((cr3
& (PAGE_SIZE
-1)) >> 5) << 2;
530 u64 pdpte
[ARRAY_SIZE(mmu
->pdptrs
)];
532 ret
= kvm_read_guest_page_mmu(vcpu
, mmu
, pdpt_gfn
, pdpte
,
533 offset
* sizeof(u64
), sizeof(pdpte
),
534 PFERR_USER_MASK
|PFERR_WRITE_MASK
);
539 for (i
= 0; i
< ARRAY_SIZE(pdpte
); ++i
) {
540 if (is_present_gpte(pdpte
[i
]) &&
542 vcpu
->arch
.mmu
.guest_rsvd_check
.rsvd_bits_mask
[0][2])) {
549 memcpy(mmu
->pdptrs
, pdpte
, sizeof(mmu
->pdptrs
));
550 __set_bit(VCPU_EXREG_PDPTR
,
551 (unsigned long *)&vcpu
->arch
.regs_avail
);
552 __set_bit(VCPU_EXREG_PDPTR
,
553 (unsigned long *)&vcpu
->arch
.regs_dirty
);
558 EXPORT_SYMBOL_GPL(load_pdptrs
);
560 static bool pdptrs_changed(struct kvm_vcpu
*vcpu
)
562 u64 pdpte
[ARRAY_SIZE(vcpu
->arch
.walk_mmu
->pdptrs
)];
568 if (is_long_mode(vcpu
) || !is_pae(vcpu
))
571 if (!test_bit(VCPU_EXREG_PDPTR
,
572 (unsigned long *)&vcpu
->arch
.regs_avail
))
575 gfn
= (kvm_read_cr3(vcpu
) & ~31u) >> PAGE_SHIFT
;
576 offset
= (kvm_read_cr3(vcpu
) & ~31u) & (PAGE_SIZE
- 1);
577 r
= kvm_read_nested_guest_page(vcpu
, gfn
, pdpte
, offset
, sizeof(pdpte
),
578 PFERR_USER_MASK
| PFERR_WRITE_MASK
);
581 changed
= memcmp(pdpte
, vcpu
->arch
.walk_mmu
->pdptrs
, sizeof(pdpte
)) != 0;
587 int kvm_set_cr0(struct kvm_vcpu
*vcpu
, unsigned long cr0
)
589 unsigned long old_cr0
= kvm_read_cr0(vcpu
);
590 unsigned long update_bits
= X86_CR0_PG
| X86_CR0_WP
;
595 if (cr0
& 0xffffffff00000000UL
)
599 cr0
&= ~CR0_RESERVED_BITS
;
601 if ((cr0
& X86_CR0_NW
) && !(cr0
& X86_CR0_CD
))
604 if ((cr0
& X86_CR0_PG
) && !(cr0
& X86_CR0_PE
))
607 if (!is_paging(vcpu
) && (cr0
& X86_CR0_PG
)) {
609 if ((vcpu
->arch
.efer
& EFER_LME
)) {
614 kvm_x86_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
619 if (is_pae(vcpu
) && !load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
,
624 if (!(cr0
& X86_CR0_PG
) && kvm_read_cr4_bits(vcpu
, X86_CR4_PCIDE
))
627 kvm_x86_ops
->set_cr0(vcpu
, cr0
);
629 if ((cr0
^ old_cr0
) & X86_CR0_PG
) {
630 kvm_clear_async_pf_completion_queue(vcpu
);
631 kvm_async_pf_hash_reset(vcpu
);
634 if ((cr0
^ old_cr0
) & update_bits
)
635 kvm_mmu_reset_context(vcpu
);
637 if (((cr0
^ old_cr0
) & X86_CR0_CD
) &&
638 kvm_arch_has_noncoherent_dma(vcpu
->kvm
) &&
639 !kvm_check_has_quirk(vcpu
->kvm
, KVM_X86_QUIRK_CD_NW_CLEARED
))
640 kvm_zap_gfn_range(vcpu
->kvm
, 0, ~0ULL);
644 EXPORT_SYMBOL_GPL(kvm_set_cr0
);
646 void kvm_lmsw(struct kvm_vcpu
*vcpu
, unsigned long msw
)
648 (void)kvm_set_cr0(vcpu
, kvm_read_cr0_bits(vcpu
, ~0x0eul
) | (msw
& 0x0f));
650 EXPORT_SYMBOL_GPL(kvm_lmsw
);
652 static void kvm_load_guest_xcr0(struct kvm_vcpu
*vcpu
)
654 if (kvm_read_cr4_bits(vcpu
, X86_CR4_OSXSAVE
) &&
655 !vcpu
->guest_xcr0_loaded
) {
656 /* kvm_set_xcr() also depends on this */
657 xsetbv(XCR_XFEATURE_ENABLED_MASK
, vcpu
->arch
.xcr0
);
658 vcpu
->guest_xcr0_loaded
= 1;
662 static void kvm_put_guest_xcr0(struct kvm_vcpu
*vcpu
)
664 if (vcpu
->guest_xcr0_loaded
) {
665 if (vcpu
->arch
.xcr0
!= host_xcr0
)
666 xsetbv(XCR_XFEATURE_ENABLED_MASK
, host_xcr0
);
667 vcpu
->guest_xcr0_loaded
= 0;
671 static int __kvm_set_xcr(struct kvm_vcpu
*vcpu
, u32 index
, u64 xcr
)
674 u64 old_xcr0
= vcpu
->arch
.xcr0
;
677 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
678 if (index
!= XCR_XFEATURE_ENABLED_MASK
)
680 if (!(xcr0
& XFEATURE_MASK_FP
))
682 if ((xcr0
& XFEATURE_MASK_YMM
) && !(xcr0
& XFEATURE_MASK_SSE
))
686 * Do not allow the guest to set bits that we do not support
687 * saving. However, xcr0 bit 0 is always set, even if the
688 * emulated CPU does not support XSAVE (see fx_init).
690 valid_bits
= vcpu
->arch
.guest_supported_xcr0
| XFEATURE_MASK_FP
;
691 if (xcr0
& ~valid_bits
)
694 if ((!(xcr0
& XFEATURE_MASK_BNDREGS
)) !=
695 (!(xcr0
& XFEATURE_MASK_BNDCSR
)))
698 if (xcr0
& XFEATURE_MASK_AVX512
) {
699 if (!(xcr0
& XFEATURE_MASK_YMM
))
701 if ((xcr0
& XFEATURE_MASK_AVX512
) != XFEATURE_MASK_AVX512
)
704 vcpu
->arch
.xcr0
= xcr0
;
706 if ((xcr0
^ old_xcr0
) & XFEATURE_MASK_EXTEND
)
707 kvm_update_cpuid(vcpu
);
711 int kvm_set_xcr(struct kvm_vcpu
*vcpu
, u32 index
, u64 xcr
)
713 if (kvm_x86_ops
->get_cpl(vcpu
) != 0 ||
714 __kvm_set_xcr(vcpu
, index
, xcr
)) {
715 kvm_inject_gp(vcpu
, 0);
720 EXPORT_SYMBOL_GPL(kvm_set_xcr
);
722 int kvm_set_cr4(struct kvm_vcpu
*vcpu
, unsigned long cr4
)
724 unsigned long old_cr4
= kvm_read_cr4(vcpu
);
725 unsigned long pdptr_bits
= X86_CR4_PGE
| X86_CR4_PSE
| X86_CR4_PAE
|
726 X86_CR4_SMEP
| X86_CR4_SMAP
| X86_CR4_PKE
;
728 if (cr4
& CR4_RESERVED_BITS
)
731 if (!guest_cpuid_has_xsave(vcpu
) && (cr4
& X86_CR4_OSXSAVE
))
734 if (!guest_cpuid_has_smep(vcpu
) && (cr4
& X86_CR4_SMEP
))
737 if (!guest_cpuid_has_smap(vcpu
) && (cr4
& X86_CR4_SMAP
))
740 if (!guest_cpuid_has_fsgsbase(vcpu
) && (cr4
& X86_CR4_FSGSBASE
))
743 if (!guest_cpuid_has_pku(vcpu
) && (cr4
& X86_CR4_PKE
))
746 if (is_long_mode(vcpu
)) {
747 if (!(cr4
& X86_CR4_PAE
))
749 } else if (is_paging(vcpu
) && (cr4
& X86_CR4_PAE
)
750 && ((cr4
^ old_cr4
) & pdptr_bits
)
751 && !load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
,
755 if ((cr4
& X86_CR4_PCIDE
) && !(old_cr4
& X86_CR4_PCIDE
)) {
756 if (!guest_cpuid_has_pcid(vcpu
))
759 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
760 if ((kvm_read_cr3(vcpu
) & X86_CR3_PCID_MASK
) || !is_long_mode(vcpu
))
764 if (kvm_x86_ops
->set_cr4(vcpu
, cr4
))
767 if (((cr4
^ old_cr4
) & pdptr_bits
) ||
768 (!(cr4
& X86_CR4_PCIDE
) && (old_cr4
& X86_CR4_PCIDE
)))
769 kvm_mmu_reset_context(vcpu
);
771 if ((cr4
^ old_cr4
) & (X86_CR4_OSXSAVE
| X86_CR4_PKE
))
772 kvm_update_cpuid(vcpu
);
776 EXPORT_SYMBOL_GPL(kvm_set_cr4
);
778 int kvm_set_cr3(struct kvm_vcpu
*vcpu
, unsigned long cr3
)
781 cr3
&= ~CR3_PCID_INVD
;
784 if (cr3
== kvm_read_cr3(vcpu
) && !pdptrs_changed(vcpu
)) {
785 kvm_mmu_sync_roots(vcpu
);
786 kvm_make_request(KVM_REQ_TLB_FLUSH
, vcpu
);
790 if (is_long_mode(vcpu
)) {
791 if (cr3
& CR3_L_MODE_RESERVED_BITS
)
793 } else if (is_pae(vcpu
) && is_paging(vcpu
) &&
794 !load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
, cr3
))
797 vcpu
->arch
.cr3
= cr3
;
798 __set_bit(VCPU_EXREG_CR3
, (ulong
*)&vcpu
->arch
.regs_avail
);
799 kvm_mmu_new_cr3(vcpu
);
802 EXPORT_SYMBOL_GPL(kvm_set_cr3
);
804 int kvm_set_cr8(struct kvm_vcpu
*vcpu
, unsigned long cr8
)
806 if (cr8
& CR8_RESERVED_BITS
)
808 if (lapic_in_kernel(vcpu
))
809 kvm_lapic_set_tpr(vcpu
, cr8
);
811 vcpu
->arch
.cr8
= cr8
;
814 EXPORT_SYMBOL_GPL(kvm_set_cr8
);
816 unsigned long kvm_get_cr8(struct kvm_vcpu
*vcpu
)
818 if (lapic_in_kernel(vcpu
))
819 return kvm_lapic_get_cr8(vcpu
);
821 return vcpu
->arch
.cr8
;
823 EXPORT_SYMBOL_GPL(kvm_get_cr8
);
825 static void kvm_update_dr0123(struct kvm_vcpu
*vcpu
)
829 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
)) {
830 for (i
= 0; i
< KVM_NR_DB_REGS
; i
++)
831 vcpu
->arch
.eff_db
[i
] = vcpu
->arch
.db
[i
];
832 vcpu
->arch
.switch_db_regs
|= KVM_DEBUGREG_RELOAD
;
836 static void kvm_update_dr6(struct kvm_vcpu
*vcpu
)
838 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
))
839 kvm_x86_ops
->set_dr6(vcpu
, vcpu
->arch
.dr6
);
842 static void kvm_update_dr7(struct kvm_vcpu
*vcpu
)
846 if (vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
)
847 dr7
= vcpu
->arch
.guest_debug_dr7
;
849 dr7
= vcpu
->arch
.dr7
;
850 kvm_x86_ops
->set_dr7(vcpu
, dr7
);
851 vcpu
->arch
.switch_db_regs
&= ~KVM_DEBUGREG_BP_ENABLED
;
852 if (dr7
& DR7_BP_EN_MASK
)
853 vcpu
->arch
.switch_db_regs
|= KVM_DEBUGREG_BP_ENABLED
;
856 static u64
kvm_dr6_fixed(struct kvm_vcpu
*vcpu
)
858 u64 fixed
= DR6_FIXED_1
;
860 if (!guest_cpuid_has_rtm(vcpu
))
865 static int __kvm_set_dr(struct kvm_vcpu
*vcpu
, int dr
, unsigned long val
)
869 vcpu
->arch
.db
[dr
] = val
;
870 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
))
871 vcpu
->arch
.eff_db
[dr
] = val
;
876 if (val
& 0xffffffff00000000ULL
)
878 vcpu
->arch
.dr6
= (val
& DR6_VOLATILE
) | kvm_dr6_fixed(vcpu
);
879 kvm_update_dr6(vcpu
);
884 if (val
& 0xffffffff00000000ULL
)
886 vcpu
->arch
.dr7
= (val
& DR7_VOLATILE
) | DR7_FIXED_1
;
887 kvm_update_dr7(vcpu
);
894 int kvm_set_dr(struct kvm_vcpu
*vcpu
, int dr
, unsigned long val
)
896 if (__kvm_set_dr(vcpu
, dr
, val
)) {
897 kvm_inject_gp(vcpu
, 0);
902 EXPORT_SYMBOL_GPL(kvm_set_dr
);
904 int kvm_get_dr(struct kvm_vcpu
*vcpu
, int dr
, unsigned long *val
)
908 *val
= vcpu
->arch
.db
[dr
];
913 if (vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
)
914 *val
= vcpu
->arch
.dr6
;
916 *val
= kvm_x86_ops
->get_dr6(vcpu
);
921 *val
= vcpu
->arch
.dr7
;
926 EXPORT_SYMBOL_GPL(kvm_get_dr
);
928 bool kvm_rdpmc(struct kvm_vcpu
*vcpu
)
930 u32 ecx
= kvm_register_read(vcpu
, VCPU_REGS_RCX
);
934 err
= kvm_pmu_rdpmc(vcpu
, ecx
, &data
);
937 kvm_register_write(vcpu
, VCPU_REGS_RAX
, (u32
)data
);
938 kvm_register_write(vcpu
, VCPU_REGS_RDX
, data
>> 32);
941 EXPORT_SYMBOL_GPL(kvm_rdpmc
);
944 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
945 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
947 * This list is modified at module load time to reflect the
948 * capabilities of the host cpu. This capabilities test skips MSRs that are
949 * kvm-specific. Those are put in emulated_msrs; filtering of emulated_msrs
950 * may depend on host virtualization features rather than host cpu features.
953 static u32 msrs_to_save
[] = {
954 MSR_IA32_SYSENTER_CS
, MSR_IA32_SYSENTER_ESP
, MSR_IA32_SYSENTER_EIP
,
957 MSR_CSTAR
, MSR_KERNEL_GS_BASE
, MSR_SYSCALL_MASK
, MSR_LSTAR
,
959 MSR_IA32_TSC
, MSR_IA32_CR_PAT
, MSR_VM_HSAVE_PA
,
960 MSR_IA32_FEATURE_CONTROL
, MSR_IA32_BNDCFGS
, MSR_TSC_AUX
,
963 static unsigned num_msrs_to_save
;
965 static u32 emulated_msrs
[] = {
966 MSR_KVM_SYSTEM_TIME
, MSR_KVM_WALL_CLOCK
,
967 MSR_KVM_SYSTEM_TIME_NEW
, MSR_KVM_WALL_CLOCK_NEW
,
968 HV_X64_MSR_GUEST_OS_ID
, HV_X64_MSR_HYPERCALL
,
969 HV_X64_MSR_TIME_REF_COUNT
, HV_X64_MSR_REFERENCE_TSC
,
970 HV_X64_MSR_CRASH_P0
, HV_X64_MSR_CRASH_P1
, HV_X64_MSR_CRASH_P2
,
971 HV_X64_MSR_CRASH_P3
, HV_X64_MSR_CRASH_P4
, HV_X64_MSR_CRASH_CTL
,
974 HV_X64_MSR_VP_RUNTIME
,
976 HV_X64_MSR_STIMER0_CONFIG
,
977 HV_X64_MSR_APIC_ASSIST_PAGE
, MSR_KVM_ASYNC_PF_EN
, MSR_KVM_STEAL_TIME
,
981 MSR_IA32_TSCDEADLINE
,
982 MSR_IA32_MISC_ENABLE
,
988 static unsigned num_emulated_msrs
;
990 bool kvm_valid_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
992 if (efer
& efer_reserved_bits
)
995 if (efer
& EFER_FFXSR
) {
996 struct kvm_cpuid_entry2
*feat
;
998 feat
= kvm_find_cpuid_entry(vcpu
, 0x80000001, 0);
999 if (!feat
|| !(feat
->edx
& bit(X86_FEATURE_FXSR_OPT
)))
1003 if (efer
& EFER_SVME
) {
1004 struct kvm_cpuid_entry2
*feat
;
1006 feat
= kvm_find_cpuid_entry(vcpu
, 0x80000001, 0);
1007 if (!feat
|| !(feat
->ecx
& bit(X86_FEATURE_SVM
)))
1013 EXPORT_SYMBOL_GPL(kvm_valid_efer
);
1015 static int set_efer(struct kvm_vcpu
*vcpu
, u64 efer
)
1017 u64 old_efer
= vcpu
->arch
.efer
;
1019 if (!kvm_valid_efer(vcpu
, efer
))
1023 && (vcpu
->arch
.efer
& EFER_LME
) != (efer
& EFER_LME
))
1027 efer
|= vcpu
->arch
.efer
& EFER_LMA
;
1029 kvm_x86_ops
->set_efer(vcpu
, efer
);
1031 /* Update reserved bits */
1032 if ((efer
^ old_efer
) & EFER_NX
)
1033 kvm_mmu_reset_context(vcpu
);
1038 void kvm_enable_efer_bits(u64 mask
)
1040 efer_reserved_bits
&= ~mask
;
1042 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits
);
1045 * Writes msr value into into the appropriate "register".
1046 * Returns 0 on success, non-0 otherwise.
1047 * Assumes vcpu_load() was already called.
1049 int kvm_set_msr(struct kvm_vcpu
*vcpu
, struct msr_data
*msr
)
1051 switch (msr
->index
) {
1054 case MSR_KERNEL_GS_BASE
:
1057 if (is_noncanonical_address(msr
->data
))
1060 case MSR_IA32_SYSENTER_EIP
:
1061 case MSR_IA32_SYSENTER_ESP
:
1063 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
1064 * non-canonical address is written on Intel but not on
1065 * AMD (which ignores the top 32-bits, because it does
1066 * not implement 64-bit SYSENTER).
1068 * 64-bit code should hence be able to write a non-canonical
1069 * value on AMD. Making the address canonical ensures that
1070 * vmentry does not fail on Intel after writing a non-canonical
1071 * value, and that something deterministic happens if the guest
1072 * invokes 64-bit SYSENTER.
1074 msr
->data
= get_canonical(msr
->data
);
1076 return kvm_x86_ops
->set_msr(vcpu
, msr
);
1078 EXPORT_SYMBOL_GPL(kvm_set_msr
);
1081 * Adapt set_msr() to msr_io()'s calling convention
1083 static int do_get_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1085 struct msr_data msr
;
1089 msr
.host_initiated
= true;
1090 r
= kvm_get_msr(vcpu
, &msr
);
1098 static int do_set_msr(struct kvm_vcpu
*vcpu
, unsigned index
, u64
*data
)
1100 struct msr_data msr
;
1104 msr
.host_initiated
= true;
1105 return kvm_set_msr(vcpu
, &msr
);
1108 #ifdef CONFIG_X86_64
1109 struct pvclock_gtod_data
{
1112 struct { /* extract of a clocksource struct */
1124 static struct pvclock_gtod_data pvclock_gtod_data
;
1126 static void update_pvclock_gtod(struct timekeeper
*tk
)
1128 struct pvclock_gtod_data
*vdata
= &pvclock_gtod_data
;
1131 boot_ns
= ktime_to_ns(ktime_add(tk
->tkr_mono
.base
, tk
->offs_boot
));
1133 write_seqcount_begin(&vdata
->seq
);
1135 /* copy pvclock gtod data */
1136 vdata
->clock
.vclock_mode
= tk
->tkr_mono
.clock
->archdata
.vclock_mode
;
1137 vdata
->clock
.cycle_last
= tk
->tkr_mono
.cycle_last
;
1138 vdata
->clock
.mask
= tk
->tkr_mono
.mask
;
1139 vdata
->clock
.mult
= tk
->tkr_mono
.mult
;
1140 vdata
->clock
.shift
= tk
->tkr_mono
.shift
;
1142 vdata
->boot_ns
= boot_ns
;
1143 vdata
->nsec_base
= tk
->tkr_mono
.xtime_nsec
;
1145 write_seqcount_end(&vdata
->seq
);
1149 void kvm_set_pending_timer(struct kvm_vcpu
*vcpu
)
1152 * Note: KVM_REQ_PENDING_TIMER is implicitly checked in
1153 * vcpu_enter_guest. This function is only called from
1154 * the physical CPU that is running vcpu.
1156 kvm_make_request(KVM_REQ_PENDING_TIMER
, vcpu
);
1159 static void kvm_write_wall_clock(struct kvm
*kvm
, gpa_t wall_clock
)
1163 struct pvclock_wall_clock wc
;
1164 struct timespec boot
;
1169 r
= kvm_read_guest(kvm
, wall_clock
, &version
, sizeof(version
));
1174 ++version
; /* first time write, random junk */
1178 if (kvm_write_guest(kvm
, wall_clock
, &version
, sizeof(version
)))
1182 * The guest calculates current wall clock time by adding
1183 * system time (updated by kvm_guest_time_update below) to the
1184 * wall clock specified here. guest system time equals host
1185 * system time for us, thus we must fill in host boot time here.
1189 if (kvm
->arch
.kvmclock_offset
) {
1190 struct timespec ts
= ns_to_timespec(kvm
->arch
.kvmclock_offset
);
1191 boot
= timespec_sub(boot
, ts
);
1193 wc
.sec
= boot
.tv_sec
;
1194 wc
.nsec
= boot
.tv_nsec
;
1195 wc
.version
= version
;
1197 kvm_write_guest(kvm
, wall_clock
, &wc
, sizeof(wc
));
1200 kvm_write_guest(kvm
, wall_clock
, &version
, sizeof(version
));
1203 static uint32_t div_frac(uint32_t dividend
, uint32_t divisor
)
1205 do_shl32_div32(dividend
, divisor
);
1209 static void kvm_get_time_scale(uint64_t scaled_hz
, uint64_t base_hz
,
1210 s8
*pshift
, u32
*pmultiplier
)
1218 scaled64
= scaled_hz
;
1219 while (tps64
> scaled64
*2 || tps64
& 0xffffffff00000000ULL
) {
1224 tps32
= (uint32_t)tps64
;
1225 while (tps32
<= scaled64
|| scaled64
& 0xffffffff00000000ULL
) {
1226 if (scaled64
& 0xffffffff00000000ULL
|| tps32
& 0x80000000)
1234 *pmultiplier
= div_frac(scaled64
, tps32
);
1236 pr_debug("%s: base_hz %llu => %llu, shift %d, mul %u\n",
1237 __func__
, base_hz
, scaled_hz
, shift
, *pmultiplier
);
1240 #ifdef CONFIG_X86_64
1241 static atomic_t kvm_guest_has_master_clock
= ATOMIC_INIT(0);
1244 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz
);
1245 static unsigned long max_tsc_khz
;
1247 static u32
adjust_tsc_khz(u32 khz
, s32 ppm
)
1249 u64 v
= (u64
)khz
* (1000000 + ppm
);
1254 static int set_tsc_khz(struct kvm_vcpu
*vcpu
, u32 user_tsc_khz
, bool scale
)
1258 /* Guest TSC same frequency as host TSC? */
1260 vcpu
->arch
.tsc_scaling_ratio
= kvm_default_tsc_scaling_ratio
;
1264 /* TSC scaling supported? */
1265 if (!kvm_has_tsc_control
) {
1266 if (user_tsc_khz
> tsc_khz
) {
1267 vcpu
->arch
.tsc_catchup
= 1;
1268 vcpu
->arch
.tsc_always_catchup
= 1;
1271 WARN(1, "user requested TSC rate below hardware speed\n");
1276 /* TSC scaling required - calculate ratio */
1277 ratio
= mul_u64_u32_div(1ULL << kvm_tsc_scaling_ratio_frac_bits
,
1278 user_tsc_khz
, tsc_khz
);
1280 if (ratio
== 0 || ratio
>= kvm_max_tsc_scaling_ratio
) {
1281 WARN_ONCE(1, "Invalid TSC scaling ratio - virtual-tsc-khz=%u\n",
1286 vcpu
->arch
.tsc_scaling_ratio
= ratio
;
1290 static int kvm_set_tsc_khz(struct kvm_vcpu
*vcpu
, u32 user_tsc_khz
)
1292 u32 thresh_lo
, thresh_hi
;
1293 int use_scaling
= 0;
1295 /* tsc_khz can be zero if TSC calibration fails */
1296 if (user_tsc_khz
== 0) {
1297 /* set tsc_scaling_ratio to a safe value */
1298 vcpu
->arch
.tsc_scaling_ratio
= kvm_default_tsc_scaling_ratio
;
1302 /* Compute a scale to convert nanoseconds in TSC cycles */
1303 kvm_get_time_scale(user_tsc_khz
* 1000LL, NSEC_PER_SEC
,
1304 &vcpu
->arch
.virtual_tsc_shift
,
1305 &vcpu
->arch
.virtual_tsc_mult
);
1306 vcpu
->arch
.virtual_tsc_khz
= user_tsc_khz
;
1309 * Compute the variation in TSC rate which is acceptable
1310 * within the range of tolerance and decide if the
1311 * rate being applied is within that bounds of the hardware
1312 * rate. If so, no scaling or compensation need be done.
1314 thresh_lo
= adjust_tsc_khz(tsc_khz
, -tsc_tolerance_ppm
);
1315 thresh_hi
= adjust_tsc_khz(tsc_khz
, tsc_tolerance_ppm
);
1316 if (user_tsc_khz
< thresh_lo
|| user_tsc_khz
> thresh_hi
) {
1317 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", user_tsc_khz
, thresh_lo
, thresh_hi
);
1320 return set_tsc_khz(vcpu
, user_tsc_khz
, use_scaling
);
1323 static u64
compute_guest_tsc(struct kvm_vcpu
*vcpu
, s64 kernel_ns
)
1325 u64 tsc
= pvclock_scale_delta(kernel_ns
-vcpu
->arch
.this_tsc_nsec
,
1326 vcpu
->arch
.virtual_tsc_mult
,
1327 vcpu
->arch
.virtual_tsc_shift
);
1328 tsc
+= vcpu
->arch
.this_tsc_write
;
1332 static void kvm_track_tsc_matching(struct kvm_vcpu
*vcpu
)
1334 #ifdef CONFIG_X86_64
1336 struct kvm_arch
*ka
= &vcpu
->kvm
->arch
;
1337 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1339 vcpus_matched
= (ka
->nr_vcpus_matched_tsc
+ 1 ==
1340 atomic_read(&vcpu
->kvm
->online_vcpus
));
1343 * Once the masterclock is enabled, always perform request in
1344 * order to update it.
1346 * In order to enable masterclock, the host clocksource must be TSC
1347 * and the vcpus need to have matched TSCs. When that happens,
1348 * perform request to enable masterclock.
1350 if (ka
->use_master_clock
||
1351 (gtod
->clock
.vclock_mode
== VCLOCK_TSC
&& vcpus_matched
))
1352 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
1354 trace_kvm_track_tsc(vcpu
->vcpu_id
, ka
->nr_vcpus_matched_tsc
,
1355 atomic_read(&vcpu
->kvm
->online_vcpus
),
1356 ka
->use_master_clock
, gtod
->clock
.vclock_mode
);
1360 static void update_ia32_tsc_adjust_msr(struct kvm_vcpu
*vcpu
, s64 offset
)
1362 u64 curr_offset
= kvm_x86_ops
->read_tsc_offset(vcpu
);
1363 vcpu
->arch
.ia32_tsc_adjust_msr
+= offset
- curr_offset
;
1367 * Multiply tsc by a fixed point number represented by ratio.
1369 * The most significant 64-N bits (mult) of ratio represent the
1370 * integral part of the fixed point number; the remaining N bits
1371 * (frac) represent the fractional part, ie. ratio represents a fixed
1372 * point number (mult + frac * 2^(-N)).
1374 * N equals to kvm_tsc_scaling_ratio_frac_bits.
1376 static inline u64
__scale_tsc(u64 ratio
, u64 tsc
)
1378 return mul_u64_u64_shr(tsc
, ratio
, kvm_tsc_scaling_ratio_frac_bits
);
1381 u64
kvm_scale_tsc(struct kvm_vcpu
*vcpu
, u64 tsc
)
1384 u64 ratio
= vcpu
->arch
.tsc_scaling_ratio
;
1386 if (ratio
!= kvm_default_tsc_scaling_ratio
)
1387 _tsc
= __scale_tsc(ratio
, tsc
);
1391 EXPORT_SYMBOL_GPL(kvm_scale_tsc
);
1393 static u64
kvm_compute_tsc_offset(struct kvm_vcpu
*vcpu
, u64 target_tsc
)
1397 tsc
= kvm_scale_tsc(vcpu
, rdtsc());
1399 return target_tsc
- tsc
;
1402 u64
kvm_read_l1_tsc(struct kvm_vcpu
*vcpu
, u64 host_tsc
)
1404 return kvm_x86_ops
->read_l1_tsc(vcpu
, kvm_scale_tsc(vcpu
, host_tsc
));
1406 EXPORT_SYMBOL_GPL(kvm_read_l1_tsc
);
1408 void kvm_write_tsc(struct kvm_vcpu
*vcpu
, struct msr_data
*msr
)
1410 struct kvm
*kvm
= vcpu
->kvm
;
1411 u64 offset
, ns
, elapsed
;
1412 unsigned long flags
;
1415 bool already_matched
;
1416 u64 data
= msr
->data
;
1418 raw_spin_lock_irqsave(&kvm
->arch
.tsc_write_lock
, flags
);
1419 offset
= kvm_compute_tsc_offset(vcpu
, data
);
1420 ns
= get_kernel_ns();
1421 elapsed
= ns
- kvm
->arch
.last_tsc_nsec
;
1423 if (vcpu
->arch
.virtual_tsc_khz
) {
1426 /* n.b - signed multiplication and division required */
1427 usdiff
= data
- kvm
->arch
.last_tsc_write
;
1428 #ifdef CONFIG_X86_64
1429 usdiff
= (usdiff
* 1000) / vcpu
->arch
.virtual_tsc_khz
;
1431 /* do_div() only does unsigned */
1432 asm("1: idivl %[divisor]\n"
1433 "2: xor %%edx, %%edx\n"
1434 " movl $0, %[faulted]\n"
1436 ".section .fixup,\"ax\"\n"
1437 "4: movl $1, %[faulted]\n"
1441 _ASM_EXTABLE(1b
, 4b
)
1443 : "=A"(usdiff
), [faulted
] "=r" (faulted
)
1444 : "A"(usdiff
* 1000), [divisor
] "rm"(vcpu
->arch
.virtual_tsc_khz
));
1447 do_div(elapsed
, 1000);
1452 /* idivl overflow => difference is larger than USEC_PER_SEC */
1454 usdiff
= USEC_PER_SEC
;
1456 usdiff
= USEC_PER_SEC
; /* disable TSC match window below */
1459 * Special case: TSC write with a small delta (1 second) of virtual
1460 * cycle time against real time is interpreted as an attempt to
1461 * synchronize the CPU.
1463 * For a reliable TSC, we can match TSC offsets, and for an unstable
1464 * TSC, we add elapsed time in this computation. We could let the
1465 * compensation code attempt to catch up if we fall behind, but
1466 * it's better to try to match offsets from the beginning.
1468 if (usdiff
< USEC_PER_SEC
&&
1469 vcpu
->arch
.virtual_tsc_khz
== kvm
->arch
.last_tsc_khz
) {
1470 if (!check_tsc_unstable()) {
1471 offset
= kvm
->arch
.cur_tsc_offset
;
1472 pr_debug("kvm: matched tsc offset for %llu\n", data
);
1474 u64 delta
= nsec_to_cycles(vcpu
, elapsed
);
1476 offset
= kvm_compute_tsc_offset(vcpu
, data
);
1477 pr_debug("kvm: adjusted tsc offset by %llu\n", delta
);
1480 already_matched
= (vcpu
->arch
.this_tsc_generation
== kvm
->arch
.cur_tsc_generation
);
1483 * We split periods of matched TSC writes into generations.
1484 * For each generation, we track the original measured
1485 * nanosecond time, offset, and write, so if TSCs are in
1486 * sync, we can match exact offset, and if not, we can match
1487 * exact software computation in compute_guest_tsc()
1489 * These values are tracked in kvm->arch.cur_xxx variables.
1491 kvm
->arch
.cur_tsc_generation
++;
1492 kvm
->arch
.cur_tsc_nsec
= ns
;
1493 kvm
->arch
.cur_tsc_write
= data
;
1494 kvm
->arch
.cur_tsc_offset
= offset
;
1496 pr_debug("kvm: new tsc generation %llu, clock %llu\n",
1497 kvm
->arch
.cur_tsc_generation
, data
);
1501 * We also track th most recent recorded KHZ, write and time to
1502 * allow the matching interval to be extended at each write.
1504 kvm
->arch
.last_tsc_nsec
= ns
;
1505 kvm
->arch
.last_tsc_write
= data
;
1506 kvm
->arch
.last_tsc_khz
= vcpu
->arch
.virtual_tsc_khz
;
1508 vcpu
->arch
.last_guest_tsc
= data
;
1510 /* Keep track of which generation this VCPU has synchronized to */
1511 vcpu
->arch
.this_tsc_generation
= kvm
->arch
.cur_tsc_generation
;
1512 vcpu
->arch
.this_tsc_nsec
= kvm
->arch
.cur_tsc_nsec
;
1513 vcpu
->arch
.this_tsc_write
= kvm
->arch
.cur_tsc_write
;
1515 if (guest_cpuid_has_tsc_adjust(vcpu
) && !msr
->host_initiated
)
1516 update_ia32_tsc_adjust_msr(vcpu
, offset
);
1517 kvm_x86_ops
->write_tsc_offset(vcpu
, offset
);
1518 raw_spin_unlock_irqrestore(&kvm
->arch
.tsc_write_lock
, flags
);
1520 spin_lock(&kvm
->arch
.pvclock_gtod_sync_lock
);
1522 kvm
->arch
.nr_vcpus_matched_tsc
= 0;
1523 } else if (!already_matched
) {
1524 kvm
->arch
.nr_vcpus_matched_tsc
++;
1527 kvm_track_tsc_matching(vcpu
);
1528 spin_unlock(&kvm
->arch
.pvclock_gtod_sync_lock
);
1531 EXPORT_SYMBOL_GPL(kvm_write_tsc
);
1533 static inline void adjust_tsc_offset_guest(struct kvm_vcpu
*vcpu
,
1536 kvm_x86_ops
->adjust_tsc_offset_guest(vcpu
, adjustment
);
1539 static inline void adjust_tsc_offset_host(struct kvm_vcpu
*vcpu
, s64 adjustment
)
1541 if (vcpu
->arch
.tsc_scaling_ratio
!= kvm_default_tsc_scaling_ratio
)
1542 WARN_ON(adjustment
< 0);
1543 adjustment
= kvm_scale_tsc(vcpu
, (u64
) adjustment
);
1544 kvm_x86_ops
->adjust_tsc_offset_guest(vcpu
, adjustment
);
1547 #ifdef CONFIG_X86_64
1549 static cycle_t
read_tsc(void)
1551 cycle_t ret
= (cycle_t
)rdtsc_ordered();
1552 u64 last
= pvclock_gtod_data
.clock
.cycle_last
;
1554 if (likely(ret
>= last
))
1558 * GCC likes to generate cmov here, but this branch is extremely
1559 * predictable (it's just a function of time and the likely is
1560 * very likely) and there's a data dependence, so force GCC
1561 * to generate a branch instead. I don't barrier() because
1562 * we don't actually need a barrier, and if this function
1563 * ever gets inlined it will generate worse code.
1569 static inline u64
vgettsc(cycle_t
*cycle_now
)
1572 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1574 *cycle_now
= read_tsc();
1576 v
= (*cycle_now
- gtod
->clock
.cycle_last
) & gtod
->clock
.mask
;
1577 return v
* gtod
->clock
.mult
;
1580 static int do_monotonic_boot(s64
*t
, cycle_t
*cycle_now
)
1582 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
1588 seq
= read_seqcount_begin(>od
->seq
);
1589 mode
= gtod
->clock
.vclock_mode
;
1590 ns
= gtod
->nsec_base
;
1591 ns
+= vgettsc(cycle_now
);
1592 ns
>>= gtod
->clock
.shift
;
1593 ns
+= gtod
->boot_ns
;
1594 } while (unlikely(read_seqcount_retry(>od
->seq
, seq
)));
1600 /* returns true if host is using tsc clocksource */
1601 static bool kvm_get_time_and_clockread(s64
*kernel_ns
, cycle_t
*cycle_now
)
1603 /* checked again under seqlock below */
1604 if (pvclock_gtod_data
.clock
.vclock_mode
!= VCLOCK_TSC
)
1607 return do_monotonic_boot(kernel_ns
, cycle_now
) == VCLOCK_TSC
;
1613 * Assuming a stable TSC across physical CPUS, and a stable TSC
1614 * across virtual CPUs, the following condition is possible.
1615 * Each numbered line represents an event visible to both
1616 * CPUs at the next numbered event.
1618 * "timespecX" represents host monotonic time. "tscX" represents
1621 * VCPU0 on CPU0 | VCPU1 on CPU1
1623 * 1. read timespec0,tsc0
1624 * 2. | timespec1 = timespec0 + N
1626 * 3. transition to guest | transition to guest
1627 * 4. ret0 = timespec0 + (rdtsc - tsc0) |
1628 * 5. | ret1 = timespec1 + (rdtsc - tsc1)
1629 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
1631 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
1634 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
1636 * - 0 < N - M => M < N
1638 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not
1639 * always the case (the difference between two distinct xtime instances
1640 * might be smaller then the difference between corresponding TSC reads,
1641 * when updating guest vcpus pvclock areas).
1643 * To avoid that problem, do not allow visibility of distinct
1644 * system_timestamp/tsc_timestamp values simultaneously: use a master
1645 * copy of host monotonic time values. Update that master copy
1648 * Rely on synchronization of host TSCs and guest TSCs for monotonicity.
1652 static void pvclock_update_vm_gtod_copy(struct kvm
*kvm
)
1654 #ifdef CONFIG_X86_64
1655 struct kvm_arch
*ka
= &kvm
->arch
;
1657 bool host_tsc_clocksource
, vcpus_matched
;
1659 vcpus_matched
= (ka
->nr_vcpus_matched_tsc
+ 1 ==
1660 atomic_read(&kvm
->online_vcpus
));
1663 * If the host uses TSC clock, then passthrough TSC as stable
1666 host_tsc_clocksource
= kvm_get_time_and_clockread(
1667 &ka
->master_kernel_ns
,
1668 &ka
->master_cycle_now
);
1670 ka
->use_master_clock
= host_tsc_clocksource
&& vcpus_matched
1671 && !backwards_tsc_observed
1672 && !ka
->boot_vcpu_runs_old_kvmclock
;
1674 if (ka
->use_master_clock
)
1675 atomic_set(&kvm_guest_has_master_clock
, 1);
1677 vclock_mode
= pvclock_gtod_data
.clock
.vclock_mode
;
1678 trace_kvm_update_master_clock(ka
->use_master_clock
, vclock_mode
,
1683 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
1685 kvm_make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
1688 static void kvm_gen_update_masterclock(struct kvm
*kvm
)
1690 #ifdef CONFIG_X86_64
1692 struct kvm_vcpu
*vcpu
;
1693 struct kvm_arch
*ka
= &kvm
->arch
;
1695 spin_lock(&ka
->pvclock_gtod_sync_lock
);
1696 kvm_make_mclock_inprogress_request(kvm
);
1697 /* no guest entries from this point */
1698 pvclock_update_vm_gtod_copy(kvm
);
1700 kvm_for_each_vcpu(i
, vcpu
, kvm
)
1701 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
1703 /* guest entries allowed */
1704 kvm_for_each_vcpu(i
, vcpu
, kvm
)
1705 clear_bit(KVM_REQ_MCLOCK_INPROGRESS
, &vcpu
->requests
);
1707 spin_unlock(&ka
->pvclock_gtod_sync_lock
);
1711 static int kvm_guest_time_update(struct kvm_vcpu
*v
)
1713 unsigned long flags
, tgt_tsc_khz
;
1714 struct kvm_vcpu_arch
*vcpu
= &v
->arch
;
1715 struct kvm_arch
*ka
= &v
->kvm
->arch
;
1717 u64 tsc_timestamp
, host_tsc
;
1718 struct pvclock_vcpu_time_info guest_hv_clock
;
1720 bool use_master_clock
;
1726 * If the host uses TSC clock, then passthrough TSC as stable
1729 spin_lock(&ka
->pvclock_gtod_sync_lock
);
1730 use_master_clock
= ka
->use_master_clock
;
1731 if (use_master_clock
) {
1732 host_tsc
= ka
->master_cycle_now
;
1733 kernel_ns
= ka
->master_kernel_ns
;
1735 spin_unlock(&ka
->pvclock_gtod_sync_lock
);
1737 /* Keep irq disabled to prevent changes to the clock */
1738 local_irq_save(flags
);
1739 tgt_tsc_khz
= __this_cpu_read(cpu_tsc_khz
);
1740 if (unlikely(tgt_tsc_khz
== 0)) {
1741 local_irq_restore(flags
);
1742 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, v
);
1745 if (!use_master_clock
) {
1747 kernel_ns
= get_kernel_ns();
1750 tsc_timestamp
= kvm_read_l1_tsc(v
, host_tsc
);
1753 * We may have to catch up the TSC to match elapsed wall clock
1754 * time for two reasons, even if kvmclock is used.
1755 * 1) CPU could have been running below the maximum TSC rate
1756 * 2) Broken TSC compensation resets the base at each VCPU
1757 * entry to avoid unknown leaps of TSC even when running
1758 * again on the same CPU. This may cause apparent elapsed
1759 * time to disappear, and the guest to stand still or run
1762 if (vcpu
->tsc_catchup
) {
1763 u64 tsc
= compute_guest_tsc(v
, kernel_ns
);
1764 if (tsc
> tsc_timestamp
) {
1765 adjust_tsc_offset_guest(v
, tsc
- tsc_timestamp
);
1766 tsc_timestamp
= tsc
;
1770 local_irq_restore(flags
);
1772 if (!vcpu
->pv_time_enabled
)
1775 if (kvm_has_tsc_control
)
1776 tgt_tsc_khz
= kvm_scale_tsc(v
, tgt_tsc_khz
);
1778 if (unlikely(vcpu
->hw_tsc_khz
!= tgt_tsc_khz
)) {
1779 kvm_get_time_scale(NSEC_PER_SEC
, tgt_tsc_khz
* 1000LL,
1780 &vcpu
->hv_clock
.tsc_shift
,
1781 &vcpu
->hv_clock
.tsc_to_system_mul
);
1782 vcpu
->hw_tsc_khz
= tgt_tsc_khz
;
1785 /* With all the info we got, fill in the values */
1786 vcpu
->hv_clock
.tsc_timestamp
= tsc_timestamp
;
1787 vcpu
->hv_clock
.system_time
= kernel_ns
+ v
->kvm
->arch
.kvmclock_offset
;
1788 vcpu
->last_guest_tsc
= tsc_timestamp
;
1790 if (unlikely(kvm_read_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1791 &guest_hv_clock
, sizeof(guest_hv_clock
))))
1794 /* This VCPU is paused, but it's legal for a guest to read another
1795 * VCPU's kvmclock, so we really have to follow the specification where
1796 * it says that version is odd if data is being modified, and even after
1799 * Version field updates must be kept separate. This is because
1800 * kvm_write_guest_cached might use a "rep movs" instruction, and
1801 * writes within a string instruction are weakly ordered. So there
1802 * are three writes overall.
1804 * As a small optimization, only write the version field in the first
1805 * and third write. The vcpu->pv_time cache is still valid, because the
1806 * version field is the first in the struct.
1808 BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info
, version
) != 0);
1810 vcpu
->hv_clock
.version
= guest_hv_clock
.version
+ 1;
1811 kvm_write_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1813 sizeof(vcpu
->hv_clock
.version
));
1817 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
1818 pvclock_flags
= (guest_hv_clock
.flags
& PVCLOCK_GUEST_STOPPED
);
1820 if (vcpu
->pvclock_set_guest_stopped_request
) {
1821 pvclock_flags
|= PVCLOCK_GUEST_STOPPED
;
1822 vcpu
->pvclock_set_guest_stopped_request
= false;
1825 /* If the host uses TSC clocksource, then it is stable */
1826 if (use_master_clock
)
1827 pvclock_flags
|= PVCLOCK_TSC_STABLE_BIT
;
1829 vcpu
->hv_clock
.flags
= pvclock_flags
;
1831 trace_kvm_pvclock_update(v
->vcpu_id
, &vcpu
->hv_clock
);
1833 kvm_write_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1835 sizeof(vcpu
->hv_clock
));
1839 vcpu
->hv_clock
.version
++;
1840 kvm_write_guest_cached(v
->kvm
, &vcpu
->pv_time
,
1842 sizeof(vcpu
->hv_clock
.version
));
1847 * kvmclock updates which are isolated to a given vcpu, such as
1848 * vcpu->cpu migration, should not allow system_timestamp from
1849 * the rest of the vcpus to remain static. Otherwise ntp frequency
1850 * correction applies to one vcpu's system_timestamp but not
1853 * So in those cases, request a kvmclock update for all vcpus.
1854 * We need to rate-limit these requests though, as they can
1855 * considerably slow guests that have a large number of vcpus.
1856 * The time for a remote vcpu to update its kvmclock is bound
1857 * by the delay we use to rate-limit the updates.
1860 #define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100)
1862 static void kvmclock_update_fn(struct work_struct
*work
)
1865 struct delayed_work
*dwork
= to_delayed_work(work
);
1866 struct kvm_arch
*ka
= container_of(dwork
, struct kvm_arch
,
1867 kvmclock_update_work
);
1868 struct kvm
*kvm
= container_of(ka
, struct kvm
, arch
);
1869 struct kvm_vcpu
*vcpu
;
1871 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1872 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
1873 kvm_vcpu_kick(vcpu
);
1877 static void kvm_gen_kvmclock_update(struct kvm_vcpu
*v
)
1879 struct kvm
*kvm
= v
->kvm
;
1881 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, v
);
1882 schedule_delayed_work(&kvm
->arch
.kvmclock_update_work
,
1883 KVMCLOCK_UPDATE_DELAY
);
1886 #define KVMCLOCK_SYNC_PERIOD (300 * HZ)
1888 static void kvmclock_sync_fn(struct work_struct
*work
)
1890 struct delayed_work
*dwork
= to_delayed_work(work
);
1891 struct kvm_arch
*ka
= container_of(dwork
, struct kvm_arch
,
1892 kvmclock_sync_work
);
1893 struct kvm
*kvm
= container_of(ka
, struct kvm
, arch
);
1895 if (!kvmclock_periodic_sync
)
1898 schedule_delayed_work(&kvm
->arch
.kvmclock_update_work
, 0);
1899 schedule_delayed_work(&kvm
->arch
.kvmclock_sync_work
,
1900 KVMCLOCK_SYNC_PERIOD
);
1903 static int set_msr_mce(struct kvm_vcpu
*vcpu
, u32 msr
, u64 data
)
1905 u64 mcg_cap
= vcpu
->arch
.mcg_cap
;
1906 unsigned bank_num
= mcg_cap
& 0xff;
1909 case MSR_IA32_MCG_STATUS
:
1910 vcpu
->arch
.mcg_status
= data
;
1912 case MSR_IA32_MCG_CTL
:
1913 if (!(mcg_cap
& MCG_CTL_P
))
1915 if (data
!= 0 && data
!= ~(u64
)0)
1917 vcpu
->arch
.mcg_ctl
= data
;
1920 if (msr
>= MSR_IA32_MC0_CTL
&&
1921 msr
< MSR_IA32_MCx_CTL(bank_num
)) {
1922 u32 offset
= msr
- MSR_IA32_MC0_CTL
;
1923 /* only 0 or all 1s can be written to IA32_MCi_CTL
1924 * some Linux kernels though clear bit 10 in bank 4 to
1925 * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1926 * this to avoid an uncatched #GP in the guest
1928 if ((offset
& 0x3) == 0 &&
1929 data
!= 0 && (data
| (1 << 10)) != ~(u64
)0)
1931 vcpu
->arch
.mce_banks
[offset
] = data
;
1939 static int xen_hvm_config(struct kvm_vcpu
*vcpu
, u64 data
)
1941 struct kvm
*kvm
= vcpu
->kvm
;
1942 int lm
= is_long_mode(vcpu
);
1943 u8
*blob_addr
= lm
? (u8
*)(long)kvm
->arch
.xen_hvm_config
.blob_addr_64
1944 : (u8
*)(long)kvm
->arch
.xen_hvm_config
.blob_addr_32
;
1945 u8 blob_size
= lm
? kvm
->arch
.xen_hvm_config
.blob_size_64
1946 : kvm
->arch
.xen_hvm_config
.blob_size_32
;
1947 u32 page_num
= data
& ~PAGE_MASK
;
1948 u64 page_addr
= data
& PAGE_MASK
;
1953 if (page_num
>= blob_size
)
1956 page
= memdup_user(blob_addr
+ (page_num
* PAGE_SIZE
), PAGE_SIZE
);
1961 if (kvm_vcpu_write_guest(vcpu
, page_addr
, page
, PAGE_SIZE
))
1970 static int kvm_pv_enable_async_pf(struct kvm_vcpu
*vcpu
, u64 data
)
1972 gpa_t gpa
= data
& ~0x3f;
1974 /* Bits 2:5 are reserved, Should be zero */
1978 vcpu
->arch
.apf
.msr_val
= data
;
1980 if (!(data
& KVM_ASYNC_PF_ENABLED
)) {
1981 kvm_clear_async_pf_completion_queue(vcpu
);
1982 kvm_async_pf_hash_reset(vcpu
);
1986 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
, &vcpu
->arch
.apf
.data
, gpa
,
1990 vcpu
->arch
.apf
.send_user_only
= !(data
& KVM_ASYNC_PF_SEND_ALWAYS
);
1991 kvm_async_pf_wakeup_all(vcpu
);
1995 static void kvmclock_reset(struct kvm_vcpu
*vcpu
)
1997 vcpu
->arch
.pv_time_enabled
= false;
2000 static void record_steal_time(struct kvm_vcpu
*vcpu
)
2002 if (!(vcpu
->arch
.st
.msr_val
& KVM_MSR_ENABLED
))
2005 if (unlikely(kvm_read_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2006 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
))))
2009 if (vcpu
->arch
.st
.steal
.version
& 1)
2010 vcpu
->arch
.st
.steal
.version
+= 1; /* first time write, random junk */
2012 vcpu
->arch
.st
.steal
.version
+= 1;
2014 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2015 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
));
2019 vcpu
->arch
.st
.steal
.steal
+= current
->sched_info
.run_delay
-
2020 vcpu
->arch
.st
.last_steal
;
2021 vcpu
->arch
.st
.last_steal
= current
->sched_info
.run_delay
;
2023 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2024 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
));
2028 vcpu
->arch
.st
.steal
.version
+= 1;
2030 kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2031 &vcpu
->arch
.st
.steal
, sizeof(struct kvm_steal_time
));
2034 int kvm_set_msr_common(struct kvm_vcpu
*vcpu
, struct msr_data
*msr_info
)
2037 u32 msr
= msr_info
->index
;
2038 u64 data
= msr_info
->data
;
2041 case MSR_AMD64_NB_CFG
:
2042 case MSR_IA32_UCODE_REV
:
2043 case MSR_IA32_UCODE_WRITE
:
2044 case MSR_VM_HSAVE_PA
:
2045 case MSR_AMD64_PATCH_LOADER
:
2046 case MSR_AMD64_BU_CFG2
:
2050 return set_efer(vcpu
, data
);
2052 data
&= ~(u64
)0x40; /* ignore flush filter disable */
2053 data
&= ~(u64
)0x100; /* ignore ignne emulation enable */
2054 data
&= ~(u64
)0x8; /* ignore TLB cache disable */
2055 data
&= ~(u64
)0x40000; /* ignore Mc status write enable */
2057 vcpu_unimpl(vcpu
, "unimplemented HWCR wrmsr: 0x%llx\n",
2062 case MSR_FAM10H_MMIO_CONF_BASE
:
2064 vcpu_unimpl(vcpu
, "unimplemented MMIO_CONF_BASE wrmsr: "
2069 case MSR_IA32_DEBUGCTLMSR
:
2071 /* We support the non-activated case already */
2073 } else if (data
& ~(DEBUGCTLMSR_LBR
| DEBUGCTLMSR_BTF
)) {
2074 /* Values other than LBR and BTF are vendor-specific,
2075 thus reserved and should throw a #GP */
2078 vcpu_unimpl(vcpu
, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
2081 case 0x200 ... 0x2ff:
2082 return kvm_mtrr_set_msr(vcpu
, msr
, data
);
2083 case MSR_IA32_APICBASE
:
2084 return kvm_set_apic_base(vcpu
, msr_info
);
2085 case APIC_BASE_MSR
... APIC_BASE_MSR
+ 0x3ff:
2086 return kvm_x2apic_msr_write(vcpu
, msr
, data
);
2087 case MSR_IA32_TSCDEADLINE
:
2088 kvm_set_lapic_tscdeadline_msr(vcpu
, data
);
2090 case MSR_IA32_TSC_ADJUST
:
2091 if (guest_cpuid_has_tsc_adjust(vcpu
)) {
2092 if (!msr_info
->host_initiated
) {
2093 s64 adj
= data
- vcpu
->arch
.ia32_tsc_adjust_msr
;
2094 adjust_tsc_offset_guest(vcpu
, adj
);
2096 vcpu
->arch
.ia32_tsc_adjust_msr
= data
;
2099 case MSR_IA32_MISC_ENABLE
:
2100 vcpu
->arch
.ia32_misc_enable_msr
= data
;
2102 case MSR_IA32_SMBASE
:
2103 if (!msr_info
->host_initiated
)
2105 vcpu
->arch
.smbase
= data
;
2107 case MSR_KVM_WALL_CLOCK_NEW
:
2108 case MSR_KVM_WALL_CLOCK
:
2109 vcpu
->kvm
->arch
.wall_clock
= data
;
2110 kvm_write_wall_clock(vcpu
->kvm
, data
);
2112 case MSR_KVM_SYSTEM_TIME_NEW
:
2113 case MSR_KVM_SYSTEM_TIME
: {
2115 struct kvm_arch
*ka
= &vcpu
->kvm
->arch
;
2117 kvmclock_reset(vcpu
);
2119 if (vcpu
->vcpu_id
== 0 && !msr_info
->host_initiated
) {
2120 bool tmp
= (msr
== MSR_KVM_SYSTEM_TIME
);
2122 if (ka
->boot_vcpu_runs_old_kvmclock
!= tmp
)
2123 set_bit(KVM_REQ_MASTERCLOCK_UPDATE
,
2126 ka
->boot_vcpu_runs_old_kvmclock
= tmp
;
2129 vcpu
->arch
.time
= data
;
2130 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE
, vcpu
);
2132 /* we verify if the enable bit is set... */
2136 gpa_offset
= data
& ~(PAGE_MASK
| 1);
2138 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
,
2139 &vcpu
->arch
.pv_time
, data
& ~1ULL,
2140 sizeof(struct pvclock_vcpu_time_info
)))
2141 vcpu
->arch
.pv_time_enabled
= false;
2143 vcpu
->arch
.pv_time_enabled
= true;
2147 case MSR_KVM_ASYNC_PF_EN
:
2148 if (kvm_pv_enable_async_pf(vcpu
, data
))
2151 case MSR_KVM_STEAL_TIME
:
2153 if (unlikely(!sched_info_on()))
2156 if (data
& KVM_STEAL_RESERVED_MASK
)
2159 if (kvm_gfn_to_hva_cache_init(vcpu
->kvm
, &vcpu
->arch
.st
.stime
,
2160 data
& KVM_STEAL_VALID_BITS
,
2161 sizeof(struct kvm_steal_time
)))
2164 vcpu
->arch
.st
.msr_val
= data
;
2166 if (!(data
& KVM_MSR_ENABLED
))
2169 kvm_make_request(KVM_REQ_STEAL_UPDATE
, vcpu
);
2172 case MSR_KVM_PV_EOI_EN
:
2173 if (kvm_lapic_enable_pv_eoi(vcpu
, data
))
2177 case MSR_IA32_MCG_CTL
:
2178 case MSR_IA32_MCG_STATUS
:
2179 case MSR_IA32_MC0_CTL
... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS
) - 1:
2180 return set_msr_mce(vcpu
, msr
, data
);
2182 case MSR_K7_PERFCTR0
... MSR_K7_PERFCTR3
:
2183 case MSR_P6_PERFCTR0
... MSR_P6_PERFCTR1
:
2184 pr
= true; /* fall through */
2185 case MSR_K7_EVNTSEL0
... MSR_K7_EVNTSEL3
:
2186 case MSR_P6_EVNTSEL0
... MSR_P6_EVNTSEL1
:
2187 if (kvm_pmu_is_valid_msr(vcpu
, msr
))
2188 return kvm_pmu_set_msr(vcpu
, msr_info
);
2190 if (pr
|| data
!= 0)
2191 vcpu_unimpl(vcpu
, "disabled perfctr wrmsr: "
2192 "0x%x data 0x%llx\n", msr
, data
);
2194 case MSR_K7_CLK_CTL
:
2196 * Ignore all writes to this no longer documented MSR.
2197 * Writes are only relevant for old K7 processors,
2198 * all pre-dating SVM, but a recommended workaround from
2199 * AMD for these chips. It is possible to specify the
2200 * affected processor models on the command line, hence
2201 * the need to ignore the workaround.
2204 case HV_X64_MSR_GUEST_OS_ID
... HV_X64_MSR_SINT15
:
2205 case HV_X64_MSR_CRASH_P0
... HV_X64_MSR_CRASH_P4
:
2206 case HV_X64_MSR_CRASH_CTL
:
2207 case HV_X64_MSR_STIMER0_CONFIG
... HV_X64_MSR_STIMER3_COUNT
:
2208 return kvm_hv_set_msr_common(vcpu
, msr
, data
,
2209 msr_info
->host_initiated
);
2210 case MSR_IA32_BBL_CR_CTL3
:
2211 /* Drop writes to this legacy MSR -- see rdmsr
2212 * counterpart for further detail.
2214 vcpu_unimpl(vcpu
, "ignored wrmsr: 0x%x data %llx\n", msr
, data
);
2216 case MSR_AMD64_OSVW_ID_LENGTH
:
2217 if (!guest_cpuid_has_osvw(vcpu
))
2219 vcpu
->arch
.osvw
.length
= data
;
2221 case MSR_AMD64_OSVW_STATUS
:
2222 if (!guest_cpuid_has_osvw(vcpu
))
2224 vcpu
->arch
.osvw
.status
= data
;
2227 if (msr
&& (msr
== vcpu
->kvm
->arch
.xen_hvm_config
.msr
))
2228 return xen_hvm_config(vcpu
, data
);
2229 if (kvm_pmu_is_valid_msr(vcpu
, msr
))
2230 return kvm_pmu_set_msr(vcpu
, msr_info
);
2232 vcpu_unimpl(vcpu
, "unhandled wrmsr: 0x%x data %llx\n",
2236 vcpu_unimpl(vcpu
, "ignored wrmsr: 0x%x data %llx\n",
2243 EXPORT_SYMBOL_GPL(kvm_set_msr_common
);
2247 * Reads an msr value (of 'msr_index') into 'pdata'.
2248 * Returns 0 on success, non-0 otherwise.
2249 * Assumes vcpu_load() was already called.
2251 int kvm_get_msr(struct kvm_vcpu
*vcpu
, struct msr_data
*msr
)
2253 return kvm_x86_ops
->get_msr(vcpu
, msr
);
2255 EXPORT_SYMBOL_GPL(kvm_get_msr
);
2257 static int get_msr_mce(struct kvm_vcpu
*vcpu
, u32 msr
, u64
*pdata
)
2260 u64 mcg_cap
= vcpu
->arch
.mcg_cap
;
2261 unsigned bank_num
= mcg_cap
& 0xff;
2264 case MSR_IA32_P5_MC_ADDR
:
2265 case MSR_IA32_P5_MC_TYPE
:
2268 case MSR_IA32_MCG_CAP
:
2269 data
= vcpu
->arch
.mcg_cap
;
2271 case MSR_IA32_MCG_CTL
:
2272 if (!(mcg_cap
& MCG_CTL_P
))
2274 data
= vcpu
->arch
.mcg_ctl
;
2276 case MSR_IA32_MCG_STATUS
:
2277 data
= vcpu
->arch
.mcg_status
;
2280 if (msr
>= MSR_IA32_MC0_CTL
&&
2281 msr
< MSR_IA32_MCx_CTL(bank_num
)) {
2282 u32 offset
= msr
- MSR_IA32_MC0_CTL
;
2283 data
= vcpu
->arch
.mce_banks
[offset
];
2292 int kvm_get_msr_common(struct kvm_vcpu
*vcpu
, struct msr_data
*msr_info
)
2294 switch (msr_info
->index
) {
2295 case MSR_IA32_PLATFORM_ID
:
2296 case MSR_IA32_EBL_CR_POWERON
:
2297 case MSR_IA32_DEBUGCTLMSR
:
2298 case MSR_IA32_LASTBRANCHFROMIP
:
2299 case MSR_IA32_LASTBRANCHTOIP
:
2300 case MSR_IA32_LASTINTFROMIP
:
2301 case MSR_IA32_LASTINTTOIP
:
2303 case MSR_K8_TSEG_ADDR
:
2304 case MSR_K8_TSEG_MASK
:
2306 case MSR_VM_HSAVE_PA
:
2307 case MSR_K8_INT_PENDING_MSG
:
2308 case MSR_AMD64_NB_CFG
:
2309 case MSR_FAM10H_MMIO_CONF_BASE
:
2310 case MSR_AMD64_BU_CFG2
:
2311 case MSR_IA32_PERF_CTL
:
2314 case MSR_K7_EVNTSEL0
... MSR_K7_EVNTSEL3
:
2315 case MSR_K7_PERFCTR0
... MSR_K7_PERFCTR3
:
2316 case MSR_P6_PERFCTR0
... MSR_P6_PERFCTR1
:
2317 case MSR_P6_EVNTSEL0
... MSR_P6_EVNTSEL1
:
2318 if (kvm_pmu_is_valid_msr(vcpu
, msr_info
->index
))
2319 return kvm_pmu_get_msr(vcpu
, msr_info
->index
, &msr_info
->data
);
2322 case MSR_IA32_UCODE_REV
:
2323 msr_info
->data
= 0x100000000ULL
;
2326 case 0x200 ... 0x2ff:
2327 return kvm_mtrr_get_msr(vcpu
, msr_info
->index
, &msr_info
->data
);
2328 case 0xcd: /* fsb frequency */
2332 * MSR_EBC_FREQUENCY_ID
2333 * Conservative value valid for even the basic CPU models.
2334 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
2335 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
2336 * and 266MHz for model 3, or 4. Set Core Clock
2337 * Frequency to System Bus Frequency Ratio to 1 (bits
2338 * 31:24) even though these are only valid for CPU
2339 * models > 2, however guests may end up dividing or
2340 * multiplying by zero otherwise.
2342 case MSR_EBC_FREQUENCY_ID
:
2343 msr_info
->data
= 1 << 24;
2345 case MSR_IA32_APICBASE
:
2346 msr_info
->data
= kvm_get_apic_base(vcpu
);
2348 case APIC_BASE_MSR
... APIC_BASE_MSR
+ 0x3ff:
2349 return kvm_x2apic_msr_read(vcpu
, msr_info
->index
, &msr_info
->data
);
2351 case MSR_IA32_TSCDEADLINE
:
2352 msr_info
->data
= kvm_get_lapic_tscdeadline_msr(vcpu
);
2354 case MSR_IA32_TSC_ADJUST
:
2355 msr_info
->data
= (u64
)vcpu
->arch
.ia32_tsc_adjust_msr
;
2357 case MSR_IA32_MISC_ENABLE
:
2358 msr_info
->data
= vcpu
->arch
.ia32_misc_enable_msr
;
2360 case MSR_IA32_SMBASE
:
2361 if (!msr_info
->host_initiated
)
2363 msr_info
->data
= vcpu
->arch
.smbase
;
2365 case MSR_IA32_PERF_STATUS
:
2366 /* TSC increment by tick */
2367 msr_info
->data
= 1000ULL;
2368 /* CPU multiplier */
2369 msr_info
->data
|= (((uint64_t)4ULL) << 40);
2372 msr_info
->data
= vcpu
->arch
.efer
;
2374 case MSR_KVM_WALL_CLOCK
:
2375 case MSR_KVM_WALL_CLOCK_NEW
:
2376 msr_info
->data
= vcpu
->kvm
->arch
.wall_clock
;
2378 case MSR_KVM_SYSTEM_TIME
:
2379 case MSR_KVM_SYSTEM_TIME_NEW
:
2380 msr_info
->data
= vcpu
->arch
.time
;
2382 case MSR_KVM_ASYNC_PF_EN
:
2383 msr_info
->data
= vcpu
->arch
.apf
.msr_val
;
2385 case MSR_KVM_STEAL_TIME
:
2386 msr_info
->data
= vcpu
->arch
.st
.msr_val
;
2388 case MSR_KVM_PV_EOI_EN
:
2389 msr_info
->data
= vcpu
->arch
.pv_eoi
.msr_val
;
2391 case MSR_IA32_P5_MC_ADDR
:
2392 case MSR_IA32_P5_MC_TYPE
:
2393 case MSR_IA32_MCG_CAP
:
2394 case MSR_IA32_MCG_CTL
:
2395 case MSR_IA32_MCG_STATUS
:
2396 case MSR_IA32_MC0_CTL
... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS
) - 1:
2397 return get_msr_mce(vcpu
, msr_info
->index
, &msr_info
->data
);
2398 case MSR_K7_CLK_CTL
:
2400 * Provide expected ramp-up count for K7. All other
2401 * are set to zero, indicating minimum divisors for
2404 * This prevents guest kernels on AMD host with CPU
2405 * type 6, model 8 and higher from exploding due to
2406 * the rdmsr failing.
2408 msr_info
->data
= 0x20000000;
2410 case HV_X64_MSR_GUEST_OS_ID
... HV_X64_MSR_SINT15
:
2411 case HV_X64_MSR_CRASH_P0
... HV_X64_MSR_CRASH_P4
:
2412 case HV_X64_MSR_CRASH_CTL
:
2413 case HV_X64_MSR_STIMER0_CONFIG
... HV_X64_MSR_STIMER3_COUNT
:
2414 return kvm_hv_get_msr_common(vcpu
,
2415 msr_info
->index
, &msr_info
->data
);
2417 case MSR_IA32_BBL_CR_CTL3
:
2418 /* This legacy MSR exists but isn't fully documented in current
2419 * silicon. It is however accessed by winxp in very narrow
2420 * scenarios where it sets bit #19, itself documented as
2421 * a "reserved" bit. Best effort attempt to source coherent
2422 * read data here should the balance of the register be
2423 * interpreted by the guest:
2425 * L2 cache control register 3: 64GB range, 256KB size,
2426 * enabled, latency 0x1, configured
2428 msr_info
->data
= 0xbe702111;
2430 case MSR_AMD64_OSVW_ID_LENGTH
:
2431 if (!guest_cpuid_has_osvw(vcpu
))
2433 msr_info
->data
= vcpu
->arch
.osvw
.length
;
2435 case MSR_AMD64_OSVW_STATUS
:
2436 if (!guest_cpuid_has_osvw(vcpu
))
2438 msr_info
->data
= vcpu
->arch
.osvw
.status
;
2441 if (kvm_pmu_is_valid_msr(vcpu
, msr_info
->index
))
2442 return kvm_pmu_get_msr(vcpu
, msr_info
->index
, &msr_info
->data
);
2444 vcpu_unimpl(vcpu
, "unhandled rdmsr: 0x%x\n", msr_info
->index
);
2447 vcpu_unimpl(vcpu
, "ignored rdmsr: 0x%x\n", msr_info
->index
);
2454 EXPORT_SYMBOL_GPL(kvm_get_msr_common
);
2457 * Read or write a bunch of msrs. All parameters are kernel addresses.
2459 * @return number of msrs set successfully.
2461 static int __msr_io(struct kvm_vcpu
*vcpu
, struct kvm_msrs
*msrs
,
2462 struct kvm_msr_entry
*entries
,
2463 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
2464 unsigned index
, u64
*data
))
2468 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
2469 for (i
= 0; i
< msrs
->nmsrs
; ++i
)
2470 if (do_msr(vcpu
, entries
[i
].index
, &entries
[i
].data
))
2472 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
2478 * Read or write a bunch of msrs. Parameters are user addresses.
2480 * @return number of msrs set successfully.
2482 static int msr_io(struct kvm_vcpu
*vcpu
, struct kvm_msrs __user
*user_msrs
,
2483 int (*do_msr
)(struct kvm_vcpu
*vcpu
,
2484 unsigned index
, u64
*data
),
2487 struct kvm_msrs msrs
;
2488 struct kvm_msr_entry
*entries
;
2493 if (copy_from_user(&msrs
, user_msrs
, sizeof msrs
))
2497 if (msrs
.nmsrs
>= MAX_IO_MSRS
)
2500 size
= sizeof(struct kvm_msr_entry
) * msrs
.nmsrs
;
2501 entries
= memdup_user(user_msrs
->entries
, size
);
2502 if (IS_ERR(entries
)) {
2503 r
= PTR_ERR(entries
);
2507 r
= n
= __msr_io(vcpu
, &msrs
, entries
, do_msr
);
2512 if (writeback
&& copy_to_user(user_msrs
->entries
, entries
, size
))
2523 int kvm_vm_ioctl_check_extension(struct kvm
*kvm
, long ext
)
2528 case KVM_CAP_IRQCHIP
:
2530 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL
:
2531 case KVM_CAP_SET_TSS_ADDR
:
2532 case KVM_CAP_EXT_CPUID
:
2533 case KVM_CAP_EXT_EMUL_CPUID
:
2534 case KVM_CAP_CLOCKSOURCE
:
2536 case KVM_CAP_NOP_IO_DELAY
:
2537 case KVM_CAP_MP_STATE
:
2538 case KVM_CAP_SYNC_MMU
:
2539 case KVM_CAP_USER_NMI
:
2540 case KVM_CAP_REINJECT_CONTROL
:
2541 case KVM_CAP_IRQ_INJECT_STATUS
:
2542 case KVM_CAP_IOEVENTFD
:
2543 case KVM_CAP_IOEVENTFD_NO_LENGTH
:
2545 case KVM_CAP_PIT_STATE2
:
2546 case KVM_CAP_SET_IDENTITY_MAP_ADDR
:
2547 case KVM_CAP_XEN_HVM
:
2548 case KVM_CAP_ADJUST_CLOCK
:
2549 case KVM_CAP_VCPU_EVENTS
:
2550 case KVM_CAP_HYPERV
:
2551 case KVM_CAP_HYPERV_VAPIC
:
2552 case KVM_CAP_HYPERV_SPIN
:
2553 case KVM_CAP_HYPERV_SYNIC
:
2554 case KVM_CAP_PCI_SEGMENT
:
2555 case KVM_CAP_DEBUGREGS
:
2556 case KVM_CAP_X86_ROBUST_SINGLESTEP
:
2558 case KVM_CAP_ASYNC_PF
:
2559 case KVM_CAP_GET_TSC_KHZ
:
2560 case KVM_CAP_KVMCLOCK_CTRL
:
2561 case KVM_CAP_READONLY_MEM
:
2562 case KVM_CAP_HYPERV_TIME
:
2563 case KVM_CAP_IOAPIC_POLARITY_IGNORED
:
2564 case KVM_CAP_TSC_DEADLINE_TIMER
:
2565 case KVM_CAP_ENABLE_CAP_VM
:
2566 case KVM_CAP_DISABLE_QUIRKS
:
2567 case KVM_CAP_SET_BOOT_CPU_ID
:
2568 case KVM_CAP_SPLIT_IRQCHIP
:
2569 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
2570 case KVM_CAP_ASSIGN_DEV_IRQ
:
2571 case KVM_CAP_PCI_2_3
:
2575 case KVM_CAP_X86_SMM
:
2576 /* SMBASE is usually relocated above 1M on modern chipsets,
2577 * and SMM handlers might indeed rely on 4G segment limits,
2578 * so do not report SMM to be available if real mode is
2579 * emulated via vm86 mode. Still, do not go to great lengths
2580 * to avoid userspace's usage of the feature, because it is a
2581 * fringe case that is not enabled except via specific settings
2582 * of the module parameters.
2584 r
= kvm_x86_ops
->cpu_has_high_real_mode_segbase();
2586 case KVM_CAP_COALESCED_MMIO
:
2587 r
= KVM_COALESCED_MMIO_PAGE_OFFSET
;
2590 r
= !kvm_x86_ops
->cpu_has_accelerated_tpr();
2592 case KVM_CAP_NR_VCPUS
:
2593 r
= KVM_SOFT_MAX_VCPUS
;
2595 case KVM_CAP_MAX_VCPUS
:
2598 case KVM_CAP_NR_MEMSLOTS
:
2599 r
= KVM_USER_MEM_SLOTS
;
2601 case KVM_CAP_PV_MMU
: /* obsolete */
2604 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
2606 r
= iommu_present(&pci_bus_type
);
2610 r
= KVM_MAX_MCE_BANKS
;
2613 r
= boot_cpu_has(X86_FEATURE_XSAVE
);
2615 case KVM_CAP_TSC_CONTROL
:
2616 r
= kvm_has_tsc_control
;
2626 long kvm_arch_dev_ioctl(struct file
*filp
,
2627 unsigned int ioctl
, unsigned long arg
)
2629 void __user
*argp
= (void __user
*)arg
;
2633 case KVM_GET_MSR_INDEX_LIST
: {
2634 struct kvm_msr_list __user
*user_msr_list
= argp
;
2635 struct kvm_msr_list msr_list
;
2639 if (copy_from_user(&msr_list
, user_msr_list
, sizeof msr_list
))
2642 msr_list
.nmsrs
= num_msrs_to_save
+ num_emulated_msrs
;
2643 if (copy_to_user(user_msr_list
, &msr_list
, sizeof msr_list
))
2646 if (n
< msr_list
.nmsrs
)
2649 if (copy_to_user(user_msr_list
->indices
, &msrs_to_save
,
2650 num_msrs_to_save
* sizeof(u32
)))
2652 if (copy_to_user(user_msr_list
->indices
+ num_msrs_to_save
,
2654 num_emulated_msrs
* sizeof(u32
)))
2659 case KVM_GET_SUPPORTED_CPUID
:
2660 case KVM_GET_EMULATED_CPUID
: {
2661 struct kvm_cpuid2 __user
*cpuid_arg
= argp
;
2662 struct kvm_cpuid2 cpuid
;
2665 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
2668 r
= kvm_dev_ioctl_get_cpuid(&cpuid
, cpuid_arg
->entries
,
2674 if (copy_to_user(cpuid_arg
, &cpuid
, sizeof cpuid
))
2679 case KVM_X86_GET_MCE_CAP_SUPPORTED
: {
2682 mce_cap
= KVM_MCE_CAP_SUPPORTED
;
2684 if (copy_to_user(argp
, &mce_cap
, sizeof mce_cap
))
2696 static void wbinvd_ipi(void *garbage
)
2701 static bool need_emulate_wbinvd(struct kvm_vcpu
*vcpu
)
2703 return kvm_arch_has_noncoherent_dma(vcpu
->kvm
);
2706 static inline void kvm_migrate_timers(struct kvm_vcpu
*vcpu
)
2708 set_bit(KVM_REQ_MIGRATE_TIMER
, &vcpu
->requests
);
2711 void kvm_arch_vcpu_load(struct kvm_vcpu
*vcpu
, int cpu
)
2713 /* Address WBINVD may be executed by guest */
2714 if (need_emulate_wbinvd(vcpu
)) {
2715 if (kvm_x86_ops
->has_wbinvd_exit())
2716 cpumask_set_cpu(cpu
, vcpu
->arch
.wbinvd_dirty_mask
);
2717 else if (vcpu
->cpu
!= -1 && vcpu
->cpu
!= cpu
)
2718 smp_call_function_single(vcpu
->cpu
,
2719 wbinvd_ipi
, NULL
, 1);
2722 kvm_x86_ops
->vcpu_load(vcpu
, cpu
);
2724 /* Apply any externally detected TSC adjustments (due to suspend) */
2725 if (unlikely(vcpu
->arch
.tsc_offset_adjustment
)) {
2726 adjust_tsc_offset_host(vcpu
, vcpu
->arch
.tsc_offset_adjustment
);
2727 vcpu
->arch
.tsc_offset_adjustment
= 0;
2728 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
2731 if (unlikely(vcpu
->cpu
!= cpu
) || check_tsc_unstable()) {
2732 s64 tsc_delta
= !vcpu
->arch
.last_host_tsc
? 0 :
2733 rdtsc() - vcpu
->arch
.last_host_tsc
;
2735 mark_tsc_unstable("KVM discovered backwards TSC");
2736 if (check_tsc_unstable()) {
2737 u64 offset
= kvm_compute_tsc_offset(vcpu
,
2738 vcpu
->arch
.last_guest_tsc
);
2739 kvm_x86_ops
->write_tsc_offset(vcpu
, offset
);
2740 vcpu
->arch
.tsc_catchup
= 1;
2743 * On a host with synchronized TSC, there is no need to update
2744 * kvmclock on vcpu->cpu migration
2746 if (!vcpu
->kvm
->arch
.use_master_clock
|| vcpu
->cpu
== -1)
2747 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE
, vcpu
);
2748 if (vcpu
->cpu
!= cpu
)
2749 kvm_migrate_timers(vcpu
);
2753 kvm_make_request(KVM_REQ_STEAL_UPDATE
, vcpu
);
2756 void kvm_arch_vcpu_put(struct kvm_vcpu
*vcpu
)
2758 kvm_x86_ops
->vcpu_put(vcpu
);
2759 kvm_put_guest_fpu(vcpu
);
2760 vcpu
->arch
.last_host_tsc
= rdtsc();
2763 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu
*vcpu
,
2764 struct kvm_lapic_state
*s
)
2766 if (vcpu
->arch
.apicv_active
)
2767 kvm_x86_ops
->sync_pir_to_irr(vcpu
);
2769 memcpy(s
->regs
, vcpu
->arch
.apic
->regs
, sizeof *s
);
2774 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu
*vcpu
,
2775 struct kvm_lapic_state
*s
)
2777 kvm_apic_post_state_restore(vcpu
, s
);
2778 update_cr8_intercept(vcpu
);
2783 static int kvm_cpu_accept_dm_intr(struct kvm_vcpu
*vcpu
)
2785 return (!lapic_in_kernel(vcpu
) ||
2786 kvm_apic_accept_pic_intr(vcpu
));
2790 * if userspace requested an interrupt window, check that the
2791 * interrupt window is open.
2793 * No need to exit to userspace if we already have an interrupt queued.
2795 static int kvm_vcpu_ready_for_interrupt_injection(struct kvm_vcpu
*vcpu
)
2797 return kvm_arch_interrupt_allowed(vcpu
) &&
2798 !kvm_cpu_has_interrupt(vcpu
) &&
2799 !kvm_event_needs_reinjection(vcpu
) &&
2800 kvm_cpu_accept_dm_intr(vcpu
);
2803 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu
*vcpu
,
2804 struct kvm_interrupt
*irq
)
2806 if (irq
->irq
>= KVM_NR_INTERRUPTS
)
2809 if (!irqchip_in_kernel(vcpu
->kvm
)) {
2810 kvm_queue_interrupt(vcpu
, irq
->irq
, false);
2811 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
2816 * With in-kernel LAPIC, we only use this to inject EXTINT, so
2817 * fail for in-kernel 8259.
2819 if (pic_in_kernel(vcpu
->kvm
))
2822 if (vcpu
->arch
.pending_external_vector
!= -1)
2825 vcpu
->arch
.pending_external_vector
= irq
->irq
;
2826 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
2830 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu
*vcpu
)
2832 kvm_inject_nmi(vcpu
);
2837 static int kvm_vcpu_ioctl_smi(struct kvm_vcpu
*vcpu
)
2839 kvm_make_request(KVM_REQ_SMI
, vcpu
);
2844 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu
*vcpu
,
2845 struct kvm_tpr_access_ctl
*tac
)
2849 vcpu
->arch
.tpr_access_reporting
= !!tac
->enabled
;
2853 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu
*vcpu
,
2857 unsigned bank_num
= mcg_cap
& 0xff, bank
;
2860 if (!bank_num
|| bank_num
>= KVM_MAX_MCE_BANKS
)
2862 if (mcg_cap
& ~(KVM_MCE_CAP_SUPPORTED
| 0xff | 0xff0000))
2865 vcpu
->arch
.mcg_cap
= mcg_cap
;
2866 /* Init IA32_MCG_CTL to all 1s */
2867 if (mcg_cap
& MCG_CTL_P
)
2868 vcpu
->arch
.mcg_ctl
= ~(u64
)0;
2869 /* Init IA32_MCi_CTL to all 1s */
2870 for (bank
= 0; bank
< bank_num
; bank
++)
2871 vcpu
->arch
.mce_banks
[bank
*4] = ~(u64
)0;
2876 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu
*vcpu
,
2877 struct kvm_x86_mce
*mce
)
2879 u64 mcg_cap
= vcpu
->arch
.mcg_cap
;
2880 unsigned bank_num
= mcg_cap
& 0xff;
2881 u64
*banks
= vcpu
->arch
.mce_banks
;
2883 if (mce
->bank
>= bank_num
|| !(mce
->status
& MCI_STATUS_VAL
))
2886 * if IA32_MCG_CTL is not all 1s, the uncorrected error
2887 * reporting is disabled
2889 if ((mce
->status
& MCI_STATUS_UC
) && (mcg_cap
& MCG_CTL_P
) &&
2890 vcpu
->arch
.mcg_ctl
!= ~(u64
)0)
2892 banks
+= 4 * mce
->bank
;
2894 * if IA32_MCi_CTL is not all 1s, the uncorrected error
2895 * reporting is disabled for the bank
2897 if ((mce
->status
& MCI_STATUS_UC
) && banks
[0] != ~(u64
)0)
2899 if (mce
->status
& MCI_STATUS_UC
) {
2900 if ((vcpu
->arch
.mcg_status
& MCG_STATUS_MCIP
) ||
2901 !kvm_read_cr4_bits(vcpu
, X86_CR4_MCE
)) {
2902 kvm_make_request(KVM_REQ_TRIPLE_FAULT
, vcpu
);
2905 if (banks
[1] & MCI_STATUS_VAL
)
2906 mce
->status
|= MCI_STATUS_OVER
;
2907 banks
[2] = mce
->addr
;
2908 banks
[3] = mce
->misc
;
2909 vcpu
->arch
.mcg_status
= mce
->mcg_status
;
2910 banks
[1] = mce
->status
;
2911 kvm_queue_exception(vcpu
, MC_VECTOR
);
2912 } else if (!(banks
[1] & MCI_STATUS_VAL
)
2913 || !(banks
[1] & MCI_STATUS_UC
)) {
2914 if (banks
[1] & MCI_STATUS_VAL
)
2915 mce
->status
|= MCI_STATUS_OVER
;
2916 banks
[2] = mce
->addr
;
2917 banks
[3] = mce
->misc
;
2918 banks
[1] = mce
->status
;
2920 banks
[1] |= MCI_STATUS_OVER
;
2924 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu
*vcpu
,
2925 struct kvm_vcpu_events
*events
)
2928 events
->exception
.injected
=
2929 vcpu
->arch
.exception
.pending
&&
2930 !kvm_exception_is_soft(vcpu
->arch
.exception
.nr
);
2931 events
->exception
.nr
= vcpu
->arch
.exception
.nr
;
2932 events
->exception
.has_error_code
= vcpu
->arch
.exception
.has_error_code
;
2933 events
->exception
.pad
= 0;
2934 events
->exception
.error_code
= vcpu
->arch
.exception
.error_code
;
2936 events
->interrupt
.injected
=
2937 vcpu
->arch
.interrupt
.pending
&& !vcpu
->arch
.interrupt
.soft
;
2938 events
->interrupt
.nr
= vcpu
->arch
.interrupt
.nr
;
2939 events
->interrupt
.soft
= 0;
2940 events
->interrupt
.shadow
= kvm_x86_ops
->get_interrupt_shadow(vcpu
);
2942 events
->nmi
.injected
= vcpu
->arch
.nmi_injected
;
2943 events
->nmi
.pending
= vcpu
->arch
.nmi_pending
!= 0;
2944 events
->nmi
.masked
= kvm_x86_ops
->get_nmi_mask(vcpu
);
2945 events
->nmi
.pad
= 0;
2947 events
->sipi_vector
= 0; /* never valid when reporting to user space */
2949 events
->smi
.smm
= is_smm(vcpu
);
2950 events
->smi
.pending
= vcpu
->arch
.smi_pending
;
2951 events
->smi
.smm_inside_nmi
=
2952 !!(vcpu
->arch
.hflags
& HF_SMM_INSIDE_NMI_MASK
);
2953 events
->smi
.latched_init
= kvm_lapic_latched_init(vcpu
);
2955 events
->flags
= (KVM_VCPUEVENT_VALID_NMI_PENDING
2956 | KVM_VCPUEVENT_VALID_SHADOW
2957 | KVM_VCPUEVENT_VALID_SMM
);
2958 memset(&events
->reserved
, 0, sizeof(events
->reserved
));
2961 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu
*vcpu
,
2962 struct kvm_vcpu_events
*events
)
2964 if (events
->flags
& ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2965 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2966 | KVM_VCPUEVENT_VALID_SHADOW
2967 | KVM_VCPUEVENT_VALID_SMM
))
2970 if (events
->exception
.injected
&&
2971 (events
->exception
.nr
> 31 || events
->exception
.nr
== NMI_VECTOR
))
2975 vcpu
->arch
.exception
.pending
= events
->exception
.injected
;
2976 vcpu
->arch
.exception
.nr
= events
->exception
.nr
;
2977 vcpu
->arch
.exception
.has_error_code
= events
->exception
.has_error_code
;
2978 vcpu
->arch
.exception
.error_code
= events
->exception
.error_code
;
2980 vcpu
->arch
.interrupt
.pending
= events
->interrupt
.injected
;
2981 vcpu
->arch
.interrupt
.nr
= events
->interrupt
.nr
;
2982 vcpu
->arch
.interrupt
.soft
= events
->interrupt
.soft
;
2983 if (events
->flags
& KVM_VCPUEVENT_VALID_SHADOW
)
2984 kvm_x86_ops
->set_interrupt_shadow(vcpu
,
2985 events
->interrupt
.shadow
);
2987 vcpu
->arch
.nmi_injected
= events
->nmi
.injected
;
2988 if (events
->flags
& KVM_VCPUEVENT_VALID_NMI_PENDING
)
2989 vcpu
->arch
.nmi_pending
= events
->nmi
.pending
;
2990 kvm_x86_ops
->set_nmi_mask(vcpu
, events
->nmi
.masked
);
2992 if (events
->flags
& KVM_VCPUEVENT_VALID_SIPI_VECTOR
&&
2993 lapic_in_kernel(vcpu
))
2994 vcpu
->arch
.apic
->sipi_vector
= events
->sipi_vector
;
2996 if (events
->flags
& KVM_VCPUEVENT_VALID_SMM
) {
2997 if (events
->smi
.smm
)
2998 vcpu
->arch
.hflags
|= HF_SMM_MASK
;
3000 vcpu
->arch
.hflags
&= ~HF_SMM_MASK
;
3001 vcpu
->arch
.smi_pending
= events
->smi
.pending
;
3002 if (events
->smi
.smm_inside_nmi
)
3003 vcpu
->arch
.hflags
|= HF_SMM_INSIDE_NMI_MASK
;
3005 vcpu
->arch
.hflags
&= ~HF_SMM_INSIDE_NMI_MASK
;
3006 if (lapic_in_kernel(vcpu
)) {
3007 if (events
->smi
.latched_init
)
3008 set_bit(KVM_APIC_INIT
, &vcpu
->arch
.apic
->pending_events
);
3010 clear_bit(KVM_APIC_INIT
, &vcpu
->arch
.apic
->pending_events
);
3014 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
3019 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu
*vcpu
,
3020 struct kvm_debugregs
*dbgregs
)
3024 memcpy(dbgregs
->db
, vcpu
->arch
.db
, sizeof(vcpu
->arch
.db
));
3025 kvm_get_dr(vcpu
, 6, &val
);
3027 dbgregs
->dr7
= vcpu
->arch
.dr7
;
3029 memset(&dbgregs
->reserved
, 0, sizeof(dbgregs
->reserved
));
3032 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu
*vcpu
,
3033 struct kvm_debugregs
*dbgregs
)
3038 if (dbgregs
->dr6
& ~0xffffffffull
)
3040 if (dbgregs
->dr7
& ~0xffffffffull
)
3043 memcpy(vcpu
->arch
.db
, dbgregs
->db
, sizeof(vcpu
->arch
.db
));
3044 kvm_update_dr0123(vcpu
);
3045 vcpu
->arch
.dr6
= dbgregs
->dr6
;
3046 kvm_update_dr6(vcpu
);
3047 vcpu
->arch
.dr7
= dbgregs
->dr7
;
3048 kvm_update_dr7(vcpu
);
3053 #define XSTATE_COMPACTION_ENABLED (1ULL << 63)
3055 static void fill_xsave(u8
*dest
, struct kvm_vcpu
*vcpu
)
3057 struct xregs_state
*xsave
= &vcpu
->arch
.guest_fpu
.state
.xsave
;
3058 u64 xstate_bv
= xsave
->header
.xfeatures
;
3062 * Copy legacy XSAVE area, to avoid complications with CPUID
3063 * leaves 0 and 1 in the loop below.
3065 memcpy(dest
, xsave
, XSAVE_HDR_OFFSET
);
3068 *(u64
*)(dest
+ XSAVE_HDR_OFFSET
) = xstate_bv
;
3071 * Copy each region from the possibly compacted offset to the
3072 * non-compacted offset.
3074 valid
= xstate_bv
& ~XFEATURE_MASK_FPSSE
;
3076 u64 feature
= valid
& -valid
;
3077 int index
= fls64(feature
) - 1;
3078 void *src
= get_xsave_addr(xsave
, feature
);
3081 u32 size
, offset
, ecx
, edx
;
3082 cpuid_count(XSTATE_CPUID
, index
,
3083 &size
, &offset
, &ecx
, &edx
);
3084 memcpy(dest
+ offset
, src
, size
);
3091 static void load_xsave(struct kvm_vcpu
*vcpu
, u8
*src
)
3093 struct xregs_state
*xsave
= &vcpu
->arch
.guest_fpu
.state
.xsave
;
3094 u64 xstate_bv
= *(u64
*)(src
+ XSAVE_HDR_OFFSET
);
3098 * Copy legacy XSAVE area, to avoid complications with CPUID
3099 * leaves 0 and 1 in the loop below.
3101 memcpy(xsave
, src
, XSAVE_HDR_OFFSET
);
3103 /* Set XSTATE_BV and possibly XCOMP_BV. */
3104 xsave
->header
.xfeatures
= xstate_bv
;
3105 if (boot_cpu_has(X86_FEATURE_XSAVES
))
3106 xsave
->header
.xcomp_bv
= host_xcr0
| XSTATE_COMPACTION_ENABLED
;
3109 * Copy each region from the non-compacted offset to the
3110 * possibly compacted offset.
3112 valid
= xstate_bv
& ~XFEATURE_MASK_FPSSE
;
3114 u64 feature
= valid
& -valid
;
3115 int index
= fls64(feature
) - 1;
3116 void *dest
= get_xsave_addr(xsave
, feature
);
3119 u32 size
, offset
, ecx
, edx
;
3120 cpuid_count(XSTATE_CPUID
, index
,
3121 &size
, &offset
, &ecx
, &edx
);
3122 memcpy(dest
, src
+ offset
, size
);
3129 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu
*vcpu
,
3130 struct kvm_xsave
*guest_xsave
)
3132 if (boot_cpu_has(X86_FEATURE_XSAVE
)) {
3133 memset(guest_xsave
, 0, sizeof(struct kvm_xsave
));
3134 fill_xsave((u8
*) guest_xsave
->region
, vcpu
);
3136 memcpy(guest_xsave
->region
,
3137 &vcpu
->arch
.guest_fpu
.state
.fxsave
,
3138 sizeof(struct fxregs_state
));
3139 *(u64
*)&guest_xsave
->region
[XSAVE_HDR_OFFSET
/ sizeof(u32
)] =
3140 XFEATURE_MASK_FPSSE
;
3144 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu
*vcpu
,
3145 struct kvm_xsave
*guest_xsave
)
3148 *(u64
*)&guest_xsave
->region
[XSAVE_HDR_OFFSET
/ sizeof(u32
)];
3150 if (boot_cpu_has(X86_FEATURE_XSAVE
)) {
3152 * Here we allow setting states that are not present in
3153 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility
3154 * with old userspace.
3156 if (xstate_bv
& ~kvm_supported_xcr0())
3158 load_xsave(vcpu
, (u8
*)guest_xsave
->region
);
3160 if (xstate_bv
& ~XFEATURE_MASK_FPSSE
)
3162 memcpy(&vcpu
->arch
.guest_fpu
.state
.fxsave
,
3163 guest_xsave
->region
, sizeof(struct fxregs_state
));
3168 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu
*vcpu
,
3169 struct kvm_xcrs
*guest_xcrs
)
3171 if (!boot_cpu_has(X86_FEATURE_XSAVE
)) {
3172 guest_xcrs
->nr_xcrs
= 0;
3176 guest_xcrs
->nr_xcrs
= 1;
3177 guest_xcrs
->flags
= 0;
3178 guest_xcrs
->xcrs
[0].xcr
= XCR_XFEATURE_ENABLED_MASK
;
3179 guest_xcrs
->xcrs
[0].value
= vcpu
->arch
.xcr0
;
3182 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu
*vcpu
,
3183 struct kvm_xcrs
*guest_xcrs
)
3187 if (!boot_cpu_has(X86_FEATURE_XSAVE
))
3190 if (guest_xcrs
->nr_xcrs
> KVM_MAX_XCRS
|| guest_xcrs
->flags
)
3193 for (i
= 0; i
< guest_xcrs
->nr_xcrs
; i
++)
3194 /* Only support XCR0 currently */
3195 if (guest_xcrs
->xcrs
[i
].xcr
== XCR_XFEATURE_ENABLED_MASK
) {
3196 r
= __kvm_set_xcr(vcpu
, XCR_XFEATURE_ENABLED_MASK
,
3197 guest_xcrs
->xcrs
[i
].value
);
3206 * kvm_set_guest_paused() indicates to the guest kernel that it has been
3207 * stopped by the hypervisor. This function will be called from the host only.
3208 * EINVAL is returned when the host attempts to set the flag for a guest that
3209 * does not support pv clocks.
3211 static int kvm_set_guest_paused(struct kvm_vcpu
*vcpu
)
3213 if (!vcpu
->arch
.pv_time_enabled
)
3215 vcpu
->arch
.pvclock_set_guest_stopped_request
= true;
3216 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
3220 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu
*vcpu
,
3221 struct kvm_enable_cap
*cap
)
3227 case KVM_CAP_HYPERV_SYNIC
:
3228 return kvm_hv_activate_synic(vcpu
);
3234 long kvm_arch_vcpu_ioctl(struct file
*filp
,
3235 unsigned int ioctl
, unsigned long arg
)
3237 struct kvm_vcpu
*vcpu
= filp
->private_data
;
3238 void __user
*argp
= (void __user
*)arg
;
3241 struct kvm_lapic_state
*lapic
;
3242 struct kvm_xsave
*xsave
;
3243 struct kvm_xcrs
*xcrs
;
3249 case KVM_GET_LAPIC
: {
3251 if (!lapic_in_kernel(vcpu
))
3253 u
.lapic
= kzalloc(sizeof(struct kvm_lapic_state
), GFP_KERNEL
);
3258 r
= kvm_vcpu_ioctl_get_lapic(vcpu
, u
.lapic
);
3262 if (copy_to_user(argp
, u
.lapic
, sizeof(struct kvm_lapic_state
)))
3267 case KVM_SET_LAPIC
: {
3269 if (!lapic_in_kernel(vcpu
))
3271 u
.lapic
= memdup_user(argp
, sizeof(*u
.lapic
));
3272 if (IS_ERR(u
.lapic
))
3273 return PTR_ERR(u
.lapic
);
3275 r
= kvm_vcpu_ioctl_set_lapic(vcpu
, u
.lapic
);
3278 case KVM_INTERRUPT
: {
3279 struct kvm_interrupt irq
;
3282 if (copy_from_user(&irq
, argp
, sizeof irq
))
3284 r
= kvm_vcpu_ioctl_interrupt(vcpu
, &irq
);
3288 r
= kvm_vcpu_ioctl_nmi(vcpu
);
3292 r
= kvm_vcpu_ioctl_smi(vcpu
);
3295 case KVM_SET_CPUID
: {
3296 struct kvm_cpuid __user
*cpuid_arg
= argp
;
3297 struct kvm_cpuid cpuid
;
3300 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
3302 r
= kvm_vcpu_ioctl_set_cpuid(vcpu
, &cpuid
, cpuid_arg
->entries
);
3305 case KVM_SET_CPUID2
: {
3306 struct kvm_cpuid2 __user
*cpuid_arg
= argp
;
3307 struct kvm_cpuid2 cpuid
;
3310 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
3312 r
= kvm_vcpu_ioctl_set_cpuid2(vcpu
, &cpuid
,
3313 cpuid_arg
->entries
);
3316 case KVM_GET_CPUID2
: {
3317 struct kvm_cpuid2 __user
*cpuid_arg
= argp
;
3318 struct kvm_cpuid2 cpuid
;
3321 if (copy_from_user(&cpuid
, cpuid_arg
, sizeof cpuid
))
3323 r
= kvm_vcpu_ioctl_get_cpuid2(vcpu
, &cpuid
,
3324 cpuid_arg
->entries
);
3328 if (copy_to_user(cpuid_arg
, &cpuid
, sizeof cpuid
))
3334 r
= msr_io(vcpu
, argp
, do_get_msr
, 1);
3337 r
= msr_io(vcpu
, argp
, do_set_msr
, 0);
3339 case KVM_TPR_ACCESS_REPORTING
: {
3340 struct kvm_tpr_access_ctl tac
;
3343 if (copy_from_user(&tac
, argp
, sizeof tac
))
3345 r
= vcpu_ioctl_tpr_access_reporting(vcpu
, &tac
);
3349 if (copy_to_user(argp
, &tac
, sizeof tac
))
3354 case KVM_SET_VAPIC_ADDR
: {
3355 struct kvm_vapic_addr va
;
3358 if (!lapic_in_kernel(vcpu
))
3361 if (copy_from_user(&va
, argp
, sizeof va
))
3363 r
= kvm_lapic_set_vapic_addr(vcpu
, va
.vapic_addr
);
3366 case KVM_X86_SETUP_MCE
: {
3370 if (copy_from_user(&mcg_cap
, argp
, sizeof mcg_cap
))
3372 r
= kvm_vcpu_ioctl_x86_setup_mce(vcpu
, mcg_cap
);
3375 case KVM_X86_SET_MCE
: {
3376 struct kvm_x86_mce mce
;
3379 if (copy_from_user(&mce
, argp
, sizeof mce
))
3381 r
= kvm_vcpu_ioctl_x86_set_mce(vcpu
, &mce
);
3384 case KVM_GET_VCPU_EVENTS
: {
3385 struct kvm_vcpu_events events
;
3387 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu
, &events
);
3390 if (copy_to_user(argp
, &events
, sizeof(struct kvm_vcpu_events
)))
3395 case KVM_SET_VCPU_EVENTS
: {
3396 struct kvm_vcpu_events events
;
3399 if (copy_from_user(&events
, argp
, sizeof(struct kvm_vcpu_events
)))
3402 r
= kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu
, &events
);
3405 case KVM_GET_DEBUGREGS
: {
3406 struct kvm_debugregs dbgregs
;
3408 kvm_vcpu_ioctl_x86_get_debugregs(vcpu
, &dbgregs
);
3411 if (copy_to_user(argp
, &dbgregs
,
3412 sizeof(struct kvm_debugregs
)))
3417 case KVM_SET_DEBUGREGS
: {
3418 struct kvm_debugregs dbgregs
;
3421 if (copy_from_user(&dbgregs
, argp
,
3422 sizeof(struct kvm_debugregs
)))
3425 r
= kvm_vcpu_ioctl_x86_set_debugregs(vcpu
, &dbgregs
);
3428 case KVM_GET_XSAVE
: {
3429 u
.xsave
= kzalloc(sizeof(struct kvm_xsave
), GFP_KERNEL
);
3434 kvm_vcpu_ioctl_x86_get_xsave(vcpu
, u
.xsave
);
3437 if (copy_to_user(argp
, u
.xsave
, sizeof(struct kvm_xsave
)))
3442 case KVM_SET_XSAVE
: {
3443 u
.xsave
= memdup_user(argp
, sizeof(*u
.xsave
));
3444 if (IS_ERR(u
.xsave
))
3445 return PTR_ERR(u
.xsave
);
3447 r
= kvm_vcpu_ioctl_x86_set_xsave(vcpu
, u
.xsave
);
3450 case KVM_GET_XCRS
: {
3451 u
.xcrs
= kzalloc(sizeof(struct kvm_xcrs
), GFP_KERNEL
);
3456 kvm_vcpu_ioctl_x86_get_xcrs(vcpu
, u
.xcrs
);
3459 if (copy_to_user(argp
, u
.xcrs
,
3460 sizeof(struct kvm_xcrs
)))
3465 case KVM_SET_XCRS
: {
3466 u
.xcrs
= memdup_user(argp
, sizeof(*u
.xcrs
));
3468 return PTR_ERR(u
.xcrs
);
3470 r
= kvm_vcpu_ioctl_x86_set_xcrs(vcpu
, u
.xcrs
);
3473 case KVM_SET_TSC_KHZ
: {
3477 user_tsc_khz
= (u32
)arg
;
3479 if (user_tsc_khz
>= kvm_max_guest_tsc_khz
)
3482 if (user_tsc_khz
== 0)
3483 user_tsc_khz
= tsc_khz
;
3485 if (!kvm_set_tsc_khz(vcpu
, user_tsc_khz
))
3490 case KVM_GET_TSC_KHZ
: {
3491 r
= vcpu
->arch
.virtual_tsc_khz
;
3494 case KVM_KVMCLOCK_CTRL
: {
3495 r
= kvm_set_guest_paused(vcpu
);
3498 case KVM_ENABLE_CAP
: {
3499 struct kvm_enable_cap cap
;
3502 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
3504 r
= kvm_vcpu_ioctl_enable_cap(vcpu
, &cap
);
3515 int kvm_arch_vcpu_fault(struct kvm_vcpu
*vcpu
, struct vm_fault
*vmf
)
3517 return VM_FAULT_SIGBUS
;
3520 static int kvm_vm_ioctl_set_tss_addr(struct kvm
*kvm
, unsigned long addr
)
3524 if (addr
> (unsigned int)(-3 * PAGE_SIZE
))
3526 ret
= kvm_x86_ops
->set_tss_addr(kvm
, addr
);
3530 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm
*kvm
,
3533 kvm
->arch
.ept_identity_map_addr
= ident_addr
;
3537 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm
*kvm
,
3538 u32 kvm_nr_mmu_pages
)
3540 if (kvm_nr_mmu_pages
< KVM_MIN_ALLOC_MMU_PAGES
)
3543 mutex_lock(&kvm
->slots_lock
);
3545 kvm_mmu_change_mmu_pages(kvm
, kvm_nr_mmu_pages
);
3546 kvm
->arch
.n_requested_mmu_pages
= kvm_nr_mmu_pages
;
3548 mutex_unlock(&kvm
->slots_lock
);
3552 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm
*kvm
)
3554 return kvm
->arch
.n_max_mmu_pages
;
3557 static int kvm_vm_ioctl_get_irqchip(struct kvm
*kvm
, struct kvm_irqchip
*chip
)
3562 switch (chip
->chip_id
) {
3563 case KVM_IRQCHIP_PIC_MASTER
:
3564 memcpy(&chip
->chip
.pic
,
3565 &pic_irqchip(kvm
)->pics
[0],
3566 sizeof(struct kvm_pic_state
));
3568 case KVM_IRQCHIP_PIC_SLAVE
:
3569 memcpy(&chip
->chip
.pic
,
3570 &pic_irqchip(kvm
)->pics
[1],
3571 sizeof(struct kvm_pic_state
));
3573 case KVM_IRQCHIP_IOAPIC
:
3574 r
= kvm_get_ioapic(kvm
, &chip
->chip
.ioapic
);
3583 static int kvm_vm_ioctl_set_irqchip(struct kvm
*kvm
, struct kvm_irqchip
*chip
)
3588 switch (chip
->chip_id
) {
3589 case KVM_IRQCHIP_PIC_MASTER
:
3590 spin_lock(&pic_irqchip(kvm
)->lock
);
3591 memcpy(&pic_irqchip(kvm
)->pics
[0],
3593 sizeof(struct kvm_pic_state
));
3594 spin_unlock(&pic_irqchip(kvm
)->lock
);
3596 case KVM_IRQCHIP_PIC_SLAVE
:
3597 spin_lock(&pic_irqchip(kvm
)->lock
);
3598 memcpy(&pic_irqchip(kvm
)->pics
[1],
3600 sizeof(struct kvm_pic_state
));
3601 spin_unlock(&pic_irqchip(kvm
)->lock
);
3603 case KVM_IRQCHIP_IOAPIC
:
3604 r
= kvm_set_ioapic(kvm
, &chip
->chip
.ioapic
);
3610 kvm_pic_update_irq(pic_irqchip(kvm
));
3614 static int kvm_vm_ioctl_get_pit(struct kvm
*kvm
, struct kvm_pit_state
*ps
)
3616 struct kvm_kpit_state
*kps
= &kvm
->arch
.vpit
->pit_state
;
3618 BUILD_BUG_ON(sizeof(*ps
) != sizeof(kps
->channels
));
3620 mutex_lock(&kps
->lock
);
3621 memcpy(ps
, &kps
->channels
, sizeof(*ps
));
3622 mutex_unlock(&kps
->lock
);
3626 static int kvm_vm_ioctl_set_pit(struct kvm
*kvm
, struct kvm_pit_state
*ps
)
3629 struct kvm_pit
*pit
= kvm
->arch
.vpit
;
3631 mutex_lock(&pit
->pit_state
.lock
);
3632 memcpy(&pit
->pit_state
.channels
, ps
, sizeof(*ps
));
3633 for (i
= 0; i
< 3; i
++)
3634 kvm_pit_load_count(pit
, i
, ps
->channels
[i
].count
, 0);
3635 mutex_unlock(&pit
->pit_state
.lock
);
3639 static int kvm_vm_ioctl_get_pit2(struct kvm
*kvm
, struct kvm_pit_state2
*ps
)
3641 mutex_lock(&kvm
->arch
.vpit
->pit_state
.lock
);
3642 memcpy(ps
->channels
, &kvm
->arch
.vpit
->pit_state
.channels
,
3643 sizeof(ps
->channels
));
3644 ps
->flags
= kvm
->arch
.vpit
->pit_state
.flags
;
3645 mutex_unlock(&kvm
->arch
.vpit
->pit_state
.lock
);
3646 memset(&ps
->reserved
, 0, sizeof(ps
->reserved
));
3650 static int kvm_vm_ioctl_set_pit2(struct kvm
*kvm
, struct kvm_pit_state2
*ps
)
3654 u32 prev_legacy
, cur_legacy
;
3655 struct kvm_pit
*pit
= kvm
->arch
.vpit
;
3657 mutex_lock(&pit
->pit_state
.lock
);
3658 prev_legacy
= pit
->pit_state
.flags
& KVM_PIT_FLAGS_HPET_LEGACY
;
3659 cur_legacy
= ps
->flags
& KVM_PIT_FLAGS_HPET_LEGACY
;
3660 if (!prev_legacy
&& cur_legacy
)
3662 memcpy(&pit
->pit_state
.channels
, &ps
->channels
,
3663 sizeof(pit
->pit_state
.channels
));
3664 pit
->pit_state
.flags
= ps
->flags
;
3665 for (i
= 0; i
< 3; i
++)
3666 kvm_pit_load_count(pit
, i
, pit
->pit_state
.channels
[i
].count
,
3668 mutex_unlock(&pit
->pit_state
.lock
);
3672 static int kvm_vm_ioctl_reinject(struct kvm
*kvm
,
3673 struct kvm_reinject_control
*control
)
3675 struct kvm_pit
*pit
= kvm
->arch
.vpit
;
3680 /* pit->pit_state.lock was overloaded to prevent userspace from getting
3681 * an inconsistent state after running multiple KVM_REINJECT_CONTROL
3682 * ioctls in parallel. Use a separate lock if that ioctl isn't rare.
3684 mutex_lock(&pit
->pit_state
.lock
);
3685 kvm_pit_set_reinject(pit
, control
->pit_reinject
);
3686 mutex_unlock(&pit
->pit_state
.lock
);
3692 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
3693 * @kvm: kvm instance
3694 * @log: slot id and address to which we copy the log
3696 * Steps 1-4 below provide general overview of dirty page logging. See
3697 * kvm_get_dirty_log_protect() function description for additional details.
3699 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
3700 * always flush the TLB (step 4) even if previous step failed and the dirty
3701 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
3702 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
3703 * writes will be marked dirty for next log read.
3705 * 1. Take a snapshot of the bit and clear it if needed.
3706 * 2. Write protect the corresponding page.
3707 * 3. Copy the snapshot to the userspace.
3708 * 4. Flush TLB's if needed.
3710 int kvm_vm_ioctl_get_dirty_log(struct kvm
*kvm
, struct kvm_dirty_log
*log
)
3712 bool is_dirty
= false;
3715 mutex_lock(&kvm
->slots_lock
);
3718 * Flush potentially hardware-cached dirty pages to dirty_bitmap.
3720 if (kvm_x86_ops
->flush_log_dirty
)
3721 kvm_x86_ops
->flush_log_dirty(kvm
);
3723 r
= kvm_get_dirty_log_protect(kvm
, log
, &is_dirty
);
3726 * All the TLBs can be flushed out of mmu lock, see the comments in
3727 * kvm_mmu_slot_remove_write_access().
3729 lockdep_assert_held(&kvm
->slots_lock
);
3731 kvm_flush_remote_tlbs(kvm
);
3733 mutex_unlock(&kvm
->slots_lock
);
3737 int kvm_vm_ioctl_irq_line(struct kvm
*kvm
, struct kvm_irq_level
*irq_event
,
3740 if (!irqchip_in_kernel(kvm
))
3743 irq_event
->status
= kvm_set_irq(kvm
, KVM_USERSPACE_IRQ_SOURCE_ID
,
3744 irq_event
->irq
, irq_event
->level
,
3749 static int kvm_vm_ioctl_enable_cap(struct kvm
*kvm
,
3750 struct kvm_enable_cap
*cap
)
3758 case KVM_CAP_DISABLE_QUIRKS
:
3759 kvm
->arch
.disabled_quirks
= cap
->args
[0];
3762 case KVM_CAP_SPLIT_IRQCHIP
: {
3763 mutex_lock(&kvm
->lock
);
3765 if (cap
->args
[0] > MAX_NR_RESERVED_IOAPIC_PINS
)
3766 goto split_irqchip_unlock
;
3768 if (irqchip_in_kernel(kvm
))
3769 goto split_irqchip_unlock
;
3770 if (atomic_read(&kvm
->online_vcpus
))
3771 goto split_irqchip_unlock
;
3772 r
= kvm_setup_empty_irq_routing(kvm
);
3774 goto split_irqchip_unlock
;
3775 /* Pairs with irqchip_in_kernel. */
3777 kvm
->arch
.irqchip_split
= true;
3778 kvm
->arch
.nr_reserved_ioapic_pins
= cap
->args
[0];
3780 split_irqchip_unlock
:
3781 mutex_unlock(&kvm
->lock
);
3791 long kvm_arch_vm_ioctl(struct file
*filp
,
3792 unsigned int ioctl
, unsigned long arg
)
3794 struct kvm
*kvm
= filp
->private_data
;
3795 void __user
*argp
= (void __user
*)arg
;
3798 * This union makes it completely explicit to gcc-3.x
3799 * that these two variables' stack usage should be
3800 * combined, not added together.
3803 struct kvm_pit_state ps
;
3804 struct kvm_pit_state2 ps2
;
3805 struct kvm_pit_config pit_config
;
3809 case KVM_SET_TSS_ADDR
:
3810 r
= kvm_vm_ioctl_set_tss_addr(kvm
, arg
);
3812 case KVM_SET_IDENTITY_MAP_ADDR
: {
3816 if (copy_from_user(&ident_addr
, argp
, sizeof ident_addr
))
3818 r
= kvm_vm_ioctl_set_identity_map_addr(kvm
, ident_addr
);
3821 case KVM_SET_NR_MMU_PAGES
:
3822 r
= kvm_vm_ioctl_set_nr_mmu_pages(kvm
, arg
);
3824 case KVM_GET_NR_MMU_PAGES
:
3825 r
= kvm_vm_ioctl_get_nr_mmu_pages(kvm
);
3827 case KVM_CREATE_IRQCHIP
: {
3828 struct kvm_pic
*vpic
;
3830 mutex_lock(&kvm
->lock
);
3833 goto create_irqchip_unlock
;
3835 if (atomic_read(&kvm
->online_vcpus
))
3836 goto create_irqchip_unlock
;
3838 vpic
= kvm_create_pic(kvm
);
3840 r
= kvm_ioapic_init(kvm
);
3842 mutex_lock(&kvm
->slots_lock
);
3843 kvm_destroy_pic(vpic
);
3844 mutex_unlock(&kvm
->slots_lock
);
3845 goto create_irqchip_unlock
;
3848 goto create_irqchip_unlock
;
3849 r
= kvm_setup_default_irq_routing(kvm
);
3851 mutex_lock(&kvm
->slots_lock
);
3852 mutex_lock(&kvm
->irq_lock
);
3853 kvm_ioapic_destroy(kvm
);
3854 kvm_destroy_pic(vpic
);
3855 mutex_unlock(&kvm
->irq_lock
);
3856 mutex_unlock(&kvm
->slots_lock
);
3857 goto create_irqchip_unlock
;
3859 /* Write kvm->irq_routing before kvm->arch.vpic. */
3861 kvm
->arch
.vpic
= vpic
;
3862 create_irqchip_unlock
:
3863 mutex_unlock(&kvm
->lock
);
3866 case KVM_CREATE_PIT
:
3867 u
.pit_config
.flags
= KVM_PIT_SPEAKER_DUMMY
;
3869 case KVM_CREATE_PIT2
:
3871 if (copy_from_user(&u
.pit_config
, argp
,
3872 sizeof(struct kvm_pit_config
)))
3875 mutex_lock(&kvm
->slots_lock
);
3878 goto create_pit_unlock
;
3880 kvm
->arch
.vpit
= kvm_create_pit(kvm
, u
.pit_config
.flags
);
3884 mutex_unlock(&kvm
->slots_lock
);
3886 case KVM_GET_IRQCHIP
: {
3887 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3888 struct kvm_irqchip
*chip
;
3890 chip
= memdup_user(argp
, sizeof(*chip
));
3897 if (!irqchip_in_kernel(kvm
) || irqchip_split(kvm
))
3898 goto get_irqchip_out
;
3899 r
= kvm_vm_ioctl_get_irqchip(kvm
, chip
);
3901 goto get_irqchip_out
;
3903 if (copy_to_user(argp
, chip
, sizeof *chip
))
3904 goto get_irqchip_out
;
3910 case KVM_SET_IRQCHIP
: {
3911 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3912 struct kvm_irqchip
*chip
;
3914 chip
= memdup_user(argp
, sizeof(*chip
));
3921 if (!irqchip_in_kernel(kvm
) || irqchip_split(kvm
))
3922 goto set_irqchip_out
;
3923 r
= kvm_vm_ioctl_set_irqchip(kvm
, chip
);
3925 goto set_irqchip_out
;
3933 if (copy_from_user(&u
.ps
, argp
, sizeof(struct kvm_pit_state
)))
3936 if (!kvm
->arch
.vpit
)
3938 r
= kvm_vm_ioctl_get_pit(kvm
, &u
.ps
);
3942 if (copy_to_user(argp
, &u
.ps
, sizeof(struct kvm_pit_state
)))
3949 if (copy_from_user(&u
.ps
, argp
, sizeof u
.ps
))
3952 if (!kvm
->arch
.vpit
)
3954 r
= kvm_vm_ioctl_set_pit(kvm
, &u
.ps
);
3957 case KVM_GET_PIT2
: {
3959 if (!kvm
->arch
.vpit
)
3961 r
= kvm_vm_ioctl_get_pit2(kvm
, &u
.ps2
);
3965 if (copy_to_user(argp
, &u
.ps2
, sizeof(u
.ps2
)))
3970 case KVM_SET_PIT2
: {
3972 if (copy_from_user(&u
.ps2
, argp
, sizeof(u
.ps2
)))
3975 if (!kvm
->arch
.vpit
)
3977 r
= kvm_vm_ioctl_set_pit2(kvm
, &u
.ps2
);
3980 case KVM_REINJECT_CONTROL
: {
3981 struct kvm_reinject_control control
;
3983 if (copy_from_user(&control
, argp
, sizeof(control
)))
3985 r
= kvm_vm_ioctl_reinject(kvm
, &control
);
3988 case KVM_SET_BOOT_CPU_ID
:
3990 mutex_lock(&kvm
->lock
);
3991 if (atomic_read(&kvm
->online_vcpus
) != 0)
3994 kvm
->arch
.bsp_vcpu_id
= arg
;
3995 mutex_unlock(&kvm
->lock
);
3997 case KVM_XEN_HVM_CONFIG
: {
3999 if (copy_from_user(&kvm
->arch
.xen_hvm_config
, argp
,
4000 sizeof(struct kvm_xen_hvm_config
)))
4003 if (kvm
->arch
.xen_hvm_config
.flags
)
4008 case KVM_SET_CLOCK
: {
4009 struct kvm_clock_data user_ns
;
4014 if (copy_from_user(&user_ns
, argp
, sizeof(user_ns
)))
4022 local_irq_disable();
4023 now_ns
= get_kernel_ns();
4024 delta
= user_ns
.clock
- now_ns
;
4026 kvm
->arch
.kvmclock_offset
= delta
;
4027 kvm_gen_update_masterclock(kvm
);
4030 case KVM_GET_CLOCK
: {
4031 struct kvm_clock_data user_ns
;
4034 local_irq_disable();
4035 now_ns
= get_kernel_ns();
4036 user_ns
.clock
= kvm
->arch
.kvmclock_offset
+ now_ns
;
4039 memset(&user_ns
.pad
, 0, sizeof(user_ns
.pad
));
4042 if (copy_to_user(argp
, &user_ns
, sizeof(user_ns
)))
4047 case KVM_ENABLE_CAP
: {
4048 struct kvm_enable_cap cap
;
4051 if (copy_from_user(&cap
, argp
, sizeof(cap
)))
4053 r
= kvm_vm_ioctl_enable_cap(kvm
, &cap
);
4057 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
4063 static void kvm_init_msr_list(void)
4068 for (i
= j
= 0; i
< ARRAY_SIZE(msrs_to_save
); i
++) {
4069 if (rdmsr_safe(msrs_to_save
[i
], &dummy
[0], &dummy
[1]) < 0)
4073 * Even MSRs that are valid in the host may not be exposed
4074 * to the guests in some cases.
4076 switch (msrs_to_save
[i
]) {
4077 case MSR_IA32_BNDCFGS
:
4078 if (!kvm_x86_ops
->mpx_supported())
4082 if (!kvm_x86_ops
->rdtscp_supported())
4090 msrs_to_save
[j
] = msrs_to_save
[i
];
4093 num_msrs_to_save
= j
;
4095 for (i
= j
= 0; i
< ARRAY_SIZE(emulated_msrs
); i
++) {
4096 switch (emulated_msrs
[i
]) {
4097 case MSR_IA32_SMBASE
:
4098 if (!kvm_x86_ops
->cpu_has_high_real_mode_segbase())
4106 emulated_msrs
[j
] = emulated_msrs
[i
];
4109 num_emulated_msrs
= j
;
4112 static int vcpu_mmio_write(struct kvm_vcpu
*vcpu
, gpa_t addr
, int len
,
4120 if (!(lapic_in_kernel(vcpu
) &&
4121 !kvm_iodevice_write(vcpu
, &vcpu
->arch
.apic
->dev
, addr
, n
, v
))
4122 && kvm_io_bus_write(vcpu
, KVM_MMIO_BUS
, addr
, n
, v
))
4133 static int vcpu_mmio_read(struct kvm_vcpu
*vcpu
, gpa_t addr
, int len
, void *v
)
4140 if (!(lapic_in_kernel(vcpu
) &&
4141 !kvm_iodevice_read(vcpu
, &vcpu
->arch
.apic
->dev
,
4143 && kvm_io_bus_read(vcpu
, KVM_MMIO_BUS
, addr
, n
, v
))
4145 trace_kvm_mmio(KVM_TRACE_MMIO_READ
, n
, addr
, *(u64
*)v
);
4155 static void kvm_set_segment(struct kvm_vcpu
*vcpu
,
4156 struct kvm_segment
*var
, int seg
)
4158 kvm_x86_ops
->set_segment(vcpu
, var
, seg
);
4161 void kvm_get_segment(struct kvm_vcpu
*vcpu
,
4162 struct kvm_segment
*var
, int seg
)
4164 kvm_x86_ops
->get_segment(vcpu
, var
, seg
);
4167 gpa_t
translate_nested_gpa(struct kvm_vcpu
*vcpu
, gpa_t gpa
, u32 access
,
4168 struct x86_exception
*exception
)
4172 BUG_ON(!mmu_is_nested(vcpu
));
4174 /* NPT walks are always user-walks */
4175 access
|= PFERR_USER_MASK
;
4176 t_gpa
= vcpu
->arch
.mmu
.gva_to_gpa(vcpu
, gpa
, access
, exception
);
4181 gpa_t
kvm_mmu_gva_to_gpa_read(struct kvm_vcpu
*vcpu
, gva_t gva
,
4182 struct x86_exception
*exception
)
4184 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4185 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4188 gpa_t
kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu
*vcpu
, gva_t gva
,
4189 struct x86_exception
*exception
)
4191 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4192 access
|= PFERR_FETCH_MASK
;
4193 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4196 gpa_t
kvm_mmu_gva_to_gpa_write(struct kvm_vcpu
*vcpu
, gva_t gva
,
4197 struct x86_exception
*exception
)
4199 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4200 access
|= PFERR_WRITE_MASK
;
4201 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4204 /* uses this to access any guest's mapped memory without checking CPL */
4205 gpa_t
kvm_mmu_gva_to_gpa_system(struct kvm_vcpu
*vcpu
, gva_t gva
,
4206 struct x86_exception
*exception
)
4208 return vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, 0, exception
);
4211 static int kvm_read_guest_virt_helper(gva_t addr
, void *val
, unsigned int bytes
,
4212 struct kvm_vcpu
*vcpu
, u32 access
,
4213 struct x86_exception
*exception
)
4216 int r
= X86EMUL_CONTINUE
;
4219 gpa_t gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, addr
, access
,
4221 unsigned offset
= addr
& (PAGE_SIZE
-1);
4222 unsigned toread
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
4225 if (gpa
== UNMAPPED_GVA
)
4226 return X86EMUL_PROPAGATE_FAULT
;
4227 ret
= kvm_vcpu_read_guest_page(vcpu
, gpa
>> PAGE_SHIFT
, data
,
4230 r
= X86EMUL_IO_NEEDED
;
4242 /* used for instruction fetching */
4243 static int kvm_fetch_guest_virt(struct x86_emulate_ctxt
*ctxt
,
4244 gva_t addr
, void *val
, unsigned int bytes
,
4245 struct x86_exception
*exception
)
4247 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4248 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4252 /* Inline kvm_read_guest_virt_helper for speed. */
4253 gpa_t gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, addr
, access
|PFERR_FETCH_MASK
,
4255 if (unlikely(gpa
== UNMAPPED_GVA
))
4256 return X86EMUL_PROPAGATE_FAULT
;
4258 offset
= addr
& (PAGE_SIZE
-1);
4259 if (WARN_ON(offset
+ bytes
> PAGE_SIZE
))
4260 bytes
= (unsigned)PAGE_SIZE
- offset
;
4261 ret
= kvm_vcpu_read_guest_page(vcpu
, gpa
>> PAGE_SHIFT
, val
,
4263 if (unlikely(ret
< 0))
4264 return X86EMUL_IO_NEEDED
;
4266 return X86EMUL_CONTINUE
;
4269 int kvm_read_guest_virt(struct x86_emulate_ctxt
*ctxt
,
4270 gva_t addr
, void *val
, unsigned int bytes
,
4271 struct x86_exception
*exception
)
4273 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4274 u32 access
= (kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0;
4276 return kvm_read_guest_virt_helper(addr
, val
, bytes
, vcpu
, access
,
4279 EXPORT_SYMBOL_GPL(kvm_read_guest_virt
);
4281 static int kvm_read_guest_virt_system(struct x86_emulate_ctxt
*ctxt
,
4282 gva_t addr
, void *val
, unsigned int bytes
,
4283 struct x86_exception
*exception
)
4285 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4286 return kvm_read_guest_virt_helper(addr
, val
, bytes
, vcpu
, 0, exception
);
4289 static int kvm_read_guest_phys_system(struct x86_emulate_ctxt
*ctxt
,
4290 unsigned long addr
, void *val
, unsigned int bytes
)
4292 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4293 int r
= kvm_vcpu_read_guest(vcpu
, addr
, val
, bytes
);
4295 return r
< 0 ? X86EMUL_IO_NEEDED
: X86EMUL_CONTINUE
;
4298 int kvm_write_guest_virt_system(struct x86_emulate_ctxt
*ctxt
,
4299 gva_t addr
, void *val
,
4301 struct x86_exception
*exception
)
4303 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4305 int r
= X86EMUL_CONTINUE
;
4308 gpa_t gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, addr
,
4311 unsigned offset
= addr
& (PAGE_SIZE
-1);
4312 unsigned towrite
= min(bytes
, (unsigned)PAGE_SIZE
- offset
);
4315 if (gpa
== UNMAPPED_GVA
)
4316 return X86EMUL_PROPAGATE_FAULT
;
4317 ret
= kvm_vcpu_write_guest(vcpu
, gpa
, data
, towrite
);
4319 r
= X86EMUL_IO_NEEDED
;
4330 EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system
);
4332 static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu
*vcpu
, unsigned long gva
,
4333 gpa_t
*gpa
, struct x86_exception
*exception
,
4336 u32 access
= ((kvm_x86_ops
->get_cpl(vcpu
) == 3) ? PFERR_USER_MASK
: 0)
4337 | (write
? PFERR_WRITE_MASK
: 0);
4340 * currently PKRU is only applied to ept enabled guest so
4341 * there is no pkey in EPT page table for L1 guest or EPT
4342 * shadow page table for L2 guest.
4344 if (vcpu_match_mmio_gva(vcpu
, gva
)
4345 && !permission_fault(vcpu
, vcpu
->arch
.walk_mmu
,
4346 vcpu
->arch
.access
, 0, access
)) {
4347 *gpa
= vcpu
->arch
.mmio_gfn
<< PAGE_SHIFT
|
4348 (gva
& (PAGE_SIZE
- 1));
4349 trace_vcpu_match_mmio(gva
, *gpa
, write
, false);
4353 *gpa
= vcpu
->arch
.walk_mmu
->gva_to_gpa(vcpu
, gva
, access
, exception
);
4355 if (*gpa
== UNMAPPED_GVA
)
4358 /* For APIC access vmexit */
4359 if ((*gpa
& PAGE_MASK
) == APIC_DEFAULT_PHYS_BASE
)
4362 if (vcpu_match_mmio_gpa(vcpu
, *gpa
)) {
4363 trace_vcpu_match_mmio(gva
, *gpa
, write
, true);
4370 int emulator_write_phys(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4371 const void *val
, int bytes
)
4375 ret
= kvm_vcpu_write_guest(vcpu
, gpa
, val
, bytes
);
4378 kvm_page_track_write(vcpu
, gpa
, val
, bytes
);
4382 struct read_write_emulator_ops
{
4383 int (*read_write_prepare
)(struct kvm_vcpu
*vcpu
, void *val
,
4385 int (*read_write_emulate
)(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4386 void *val
, int bytes
);
4387 int (*read_write_mmio
)(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4388 int bytes
, void *val
);
4389 int (*read_write_exit_mmio
)(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4390 void *val
, int bytes
);
4394 static int read_prepare(struct kvm_vcpu
*vcpu
, void *val
, int bytes
)
4396 if (vcpu
->mmio_read_completed
) {
4397 trace_kvm_mmio(KVM_TRACE_MMIO_READ
, bytes
,
4398 vcpu
->mmio_fragments
[0].gpa
, *(u64
*)val
);
4399 vcpu
->mmio_read_completed
= 0;
4406 static int read_emulate(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4407 void *val
, int bytes
)
4409 return !kvm_vcpu_read_guest(vcpu
, gpa
, val
, bytes
);
4412 static int write_emulate(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4413 void *val
, int bytes
)
4415 return emulator_write_phys(vcpu
, gpa
, val
, bytes
);
4418 static int write_mmio(struct kvm_vcpu
*vcpu
, gpa_t gpa
, int bytes
, void *val
)
4420 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE
, bytes
, gpa
, *(u64
*)val
);
4421 return vcpu_mmio_write(vcpu
, gpa
, bytes
, val
);
4424 static int read_exit_mmio(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4425 void *val
, int bytes
)
4427 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED
, bytes
, gpa
, 0);
4428 return X86EMUL_IO_NEEDED
;
4431 static int write_exit_mmio(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
4432 void *val
, int bytes
)
4434 struct kvm_mmio_fragment
*frag
= &vcpu
->mmio_fragments
[0];
4436 memcpy(vcpu
->run
->mmio
.data
, frag
->data
, min(8u, frag
->len
));
4437 return X86EMUL_CONTINUE
;
4440 static const struct read_write_emulator_ops read_emultor
= {
4441 .read_write_prepare
= read_prepare
,
4442 .read_write_emulate
= read_emulate
,
4443 .read_write_mmio
= vcpu_mmio_read
,
4444 .read_write_exit_mmio
= read_exit_mmio
,
4447 static const struct read_write_emulator_ops write_emultor
= {
4448 .read_write_emulate
= write_emulate
,
4449 .read_write_mmio
= write_mmio
,
4450 .read_write_exit_mmio
= write_exit_mmio
,
4454 static int emulator_read_write_onepage(unsigned long addr
, void *val
,
4456 struct x86_exception
*exception
,
4457 struct kvm_vcpu
*vcpu
,
4458 const struct read_write_emulator_ops
*ops
)
4462 bool write
= ops
->write
;
4463 struct kvm_mmio_fragment
*frag
;
4465 ret
= vcpu_mmio_gva_to_gpa(vcpu
, addr
, &gpa
, exception
, write
);
4468 return X86EMUL_PROPAGATE_FAULT
;
4470 /* For APIC access vmexit */
4474 if (ops
->read_write_emulate(vcpu
, gpa
, val
, bytes
))
4475 return X86EMUL_CONTINUE
;
4479 * Is this MMIO handled locally?
4481 handled
= ops
->read_write_mmio(vcpu
, gpa
, bytes
, val
);
4482 if (handled
== bytes
)
4483 return X86EMUL_CONTINUE
;
4489 WARN_ON(vcpu
->mmio_nr_fragments
>= KVM_MAX_MMIO_FRAGMENTS
);
4490 frag
= &vcpu
->mmio_fragments
[vcpu
->mmio_nr_fragments
++];
4494 return X86EMUL_CONTINUE
;
4497 static int emulator_read_write(struct x86_emulate_ctxt
*ctxt
,
4499 void *val
, unsigned int bytes
,
4500 struct x86_exception
*exception
,
4501 const struct read_write_emulator_ops
*ops
)
4503 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4507 if (ops
->read_write_prepare
&&
4508 ops
->read_write_prepare(vcpu
, val
, bytes
))
4509 return X86EMUL_CONTINUE
;
4511 vcpu
->mmio_nr_fragments
= 0;
4513 /* Crossing a page boundary? */
4514 if (((addr
+ bytes
- 1) ^ addr
) & PAGE_MASK
) {
4517 now
= -addr
& ~PAGE_MASK
;
4518 rc
= emulator_read_write_onepage(addr
, val
, now
, exception
,
4521 if (rc
!= X86EMUL_CONTINUE
)
4524 if (ctxt
->mode
!= X86EMUL_MODE_PROT64
)
4530 rc
= emulator_read_write_onepage(addr
, val
, bytes
, exception
,
4532 if (rc
!= X86EMUL_CONTINUE
)
4535 if (!vcpu
->mmio_nr_fragments
)
4538 gpa
= vcpu
->mmio_fragments
[0].gpa
;
4540 vcpu
->mmio_needed
= 1;
4541 vcpu
->mmio_cur_fragment
= 0;
4543 vcpu
->run
->mmio
.len
= min(8u, vcpu
->mmio_fragments
[0].len
);
4544 vcpu
->run
->mmio
.is_write
= vcpu
->mmio_is_write
= ops
->write
;
4545 vcpu
->run
->exit_reason
= KVM_EXIT_MMIO
;
4546 vcpu
->run
->mmio
.phys_addr
= gpa
;
4548 return ops
->read_write_exit_mmio(vcpu
, gpa
, val
, bytes
);
4551 static int emulator_read_emulated(struct x86_emulate_ctxt
*ctxt
,
4555 struct x86_exception
*exception
)
4557 return emulator_read_write(ctxt
, addr
, val
, bytes
,
4558 exception
, &read_emultor
);
4561 static int emulator_write_emulated(struct x86_emulate_ctxt
*ctxt
,
4565 struct x86_exception
*exception
)
4567 return emulator_read_write(ctxt
, addr
, (void *)val
, bytes
,
4568 exception
, &write_emultor
);
4571 #define CMPXCHG_TYPE(t, ptr, old, new) \
4572 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
4574 #ifdef CONFIG_X86_64
4575 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
4577 # define CMPXCHG64(ptr, old, new) \
4578 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
4581 static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt
*ctxt
,
4586 struct x86_exception
*exception
)
4588 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4594 /* guests cmpxchg8b have to be emulated atomically */
4595 if (bytes
> 8 || (bytes
& (bytes
- 1)))
4598 gpa
= kvm_mmu_gva_to_gpa_write(vcpu
, addr
, NULL
);
4600 if (gpa
== UNMAPPED_GVA
||
4601 (gpa
& PAGE_MASK
) == APIC_DEFAULT_PHYS_BASE
)
4604 if (((gpa
+ bytes
- 1) & PAGE_MASK
) != (gpa
& PAGE_MASK
))
4607 page
= kvm_vcpu_gfn_to_page(vcpu
, gpa
>> PAGE_SHIFT
);
4608 if (is_error_page(page
))
4611 kaddr
= kmap_atomic(page
);
4612 kaddr
+= offset_in_page(gpa
);
4615 exchanged
= CMPXCHG_TYPE(u8
, kaddr
, old
, new);
4618 exchanged
= CMPXCHG_TYPE(u16
, kaddr
, old
, new);
4621 exchanged
= CMPXCHG_TYPE(u32
, kaddr
, old
, new);
4624 exchanged
= CMPXCHG64(kaddr
, old
, new);
4629 kunmap_atomic(kaddr
);
4630 kvm_release_page_dirty(page
);
4633 return X86EMUL_CMPXCHG_FAILED
;
4635 kvm_vcpu_mark_page_dirty(vcpu
, gpa
>> PAGE_SHIFT
);
4636 kvm_page_track_write(vcpu
, gpa
, new, bytes
);
4638 return X86EMUL_CONTINUE
;
4641 printk_once(KERN_WARNING
"kvm: emulating exchange as write\n");
4643 return emulator_write_emulated(ctxt
, addr
, new, bytes
, exception
);
4646 static int kernel_pio(struct kvm_vcpu
*vcpu
, void *pd
)
4648 /* TODO: String I/O for in kernel device */
4651 if (vcpu
->arch
.pio
.in
)
4652 r
= kvm_io_bus_read(vcpu
, KVM_PIO_BUS
, vcpu
->arch
.pio
.port
,
4653 vcpu
->arch
.pio
.size
, pd
);
4655 r
= kvm_io_bus_write(vcpu
, KVM_PIO_BUS
,
4656 vcpu
->arch
.pio
.port
, vcpu
->arch
.pio
.size
,
4661 static int emulator_pio_in_out(struct kvm_vcpu
*vcpu
, int size
,
4662 unsigned short port
, void *val
,
4663 unsigned int count
, bool in
)
4665 vcpu
->arch
.pio
.port
= port
;
4666 vcpu
->arch
.pio
.in
= in
;
4667 vcpu
->arch
.pio
.count
= count
;
4668 vcpu
->arch
.pio
.size
= size
;
4670 if (!kernel_pio(vcpu
, vcpu
->arch
.pio_data
)) {
4671 vcpu
->arch
.pio
.count
= 0;
4675 vcpu
->run
->exit_reason
= KVM_EXIT_IO
;
4676 vcpu
->run
->io
.direction
= in
? KVM_EXIT_IO_IN
: KVM_EXIT_IO_OUT
;
4677 vcpu
->run
->io
.size
= size
;
4678 vcpu
->run
->io
.data_offset
= KVM_PIO_PAGE_OFFSET
* PAGE_SIZE
;
4679 vcpu
->run
->io
.count
= count
;
4680 vcpu
->run
->io
.port
= port
;
4685 static int emulator_pio_in_emulated(struct x86_emulate_ctxt
*ctxt
,
4686 int size
, unsigned short port
, void *val
,
4689 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4692 if (vcpu
->arch
.pio
.count
)
4695 ret
= emulator_pio_in_out(vcpu
, size
, port
, val
, count
, true);
4698 memcpy(val
, vcpu
->arch
.pio_data
, size
* count
);
4699 trace_kvm_pio(KVM_PIO_IN
, port
, size
, count
, vcpu
->arch
.pio_data
);
4700 vcpu
->arch
.pio
.count
= 0;
4707 static int emulator_pio_out_emulated(struct x86_emulate_ctxt
*ctxt
,
4708 int size
, unsigned short port
,
4709 const void *val
, unsigned int count
)
4711 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4713 memcpy(vcpu
->arch
.pio_data
, val
, size
* count
);
4714 trace_kvm_pio(KVM_PIO_OUT
, port
, size
, count
, vcpu
->arch
.pio_data
);
4715 return emulator_pio_in_out(vcpu
, size
, port
, (void *)val
, count
, false);
4718 static unsigned long get_segment_base(struct kvm_vcpu
*vcpu
, int seg
)
4720 return kvm_x86_ops
->get_segment_base(vcpu
, seg
);
4723 static void emulator_invlpg(struct x86_emulate_ctxt
*ctxt
, ulong address
)
4725 kvm_mmu_invlpg(emul_to_vcpu(ctxt
), address
);
4728 int kvm_emulate_wbinvd_noskip(struct kvm_vcpu
*vcpu
)
4730 if (!need_emulate_wbinvd(vcpu
))
4731 return X86EMUL_CONTINUE
;
4733 if (kvm_x86_ops
->has_wbinvd_exit()) {
4734 int cpu
= get_cpu();
4736 cpumask_set_cpu(cpu
, vcpu
->arch
.wbinvd_dirty_mask
);
4737 smp_call_function_many(vcpu
->arch
.wbinvd_dirty_mask
,
4738 wbinvd_ipi
, NULL
, 1);
4740 cpumask_clear(vcpu
->arch
.wbinvd_dirty_mask
);
4743 return X86EMUL_CONTINUE
;
4746 int kvm_emulate_wbinvd(struct kvm_vcpu
*vcpu
)
4748 kvm_x86_ops
->skip_emulated_instruction(vcpu
);
4749 return kvm_emulate_wbinvd_noskip(vcpu
);
4751 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd
);
4755 static void emulator_wbinvd(struct x86_emulate_ctxt
*ctxt
)
4757 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt
));
4760 static int emulator_get_dr(struct x86_emulate_ctxt
*ctxt
, int dr
,
4761 unsigned long *dest
)
4763 return kvm_get_dr(emul_to_vcpu(ctxt
), dr
, dest
);
4766 static int emulator_set_dr(struct x86_emulate_ctxt
*ctxt
, int dr
,
4767 unsigned long value
)
4770 return __kvm_set_dr(emul_to_vcpu(ctxt
), dr
, value
);
4773 static u64
mk_cr_64(u64 curr_cr
, u32 new_val
)
4775 return (curr_cr
& ~((1ULL << 32) - 1)) | new_val
;
4778 static unsigned long emulator_get_cr(struct x86_emulate_ctxt
*ctxt
, int cr
)
4780 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4781 unsigned long value
;
4785 value
= kvm_read_cr0(vcpu
);
4788 value
= vcpu
->arch
.cr2
;
4791 value
= kvm_read_cr3(vcpu
);
4794 value
= kvm_read_cr4(vcpu
);
4797 value
= kvm_get_cr8(vcpu
);
4800 kvm_err("%s: unexpected cr %u\n", __func__
, cr
);
4807 static int emulator_set_cr(struct x86_emulate_ctxt
*ctxt
, int cr
, ulong val
)
4809 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4814 res
= kvm_set_cr0(vcpu
, mk_cr_64(kvm_read_cr0(vcpu
), val
));
4817 vcpu
->arch
.cr2
= val
;
4820 res
= kvm_set_cr3(vcpu
, val
);
4823 res
= kvm_set_cr4(vcpu
, mk_cr_64(kvm_read_cr4(vcpu
), val
));
4826 res
= kvm_set_cr8(vcpu
, val
);
4829 kvm_err("%s: unexpected cr %u\n", __func__
, cr
);
4836 static int emulator_get_cpl(struct x86_emulate_ctxt
*ctxt
)
4838 return kvm_x86_ops
->get_cpl(emul_to_vcpu(ctxt
));
4841 static void emulator_get_gdt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
4843 kvm_x86_ops
->get_gdt(emul_to_vcpu(ctxt
), dt
);
4846 static void emulator_get_idt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
4848 kvm_x86_ops
->get_idt(emul_to_vcpu(ctxt
), dt
);
4851 static void emulator_set_gdt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
4853 kvm_x86_ops
->set_gdt(emul_to_vcpu(ctxt
), dt
);
4856 static void emulator_set_idt(struct x86_emulate_ctxt
*ctxt
, struct desc_ptr
*dt
)
4858 kvm_x86_ops
->set_idt(emul_to_vcpu(ctxt
), dt
);
4861 static unsigned long emulator_get_cached_segment_base(
4862 struct x86_emulate_ctxt
*ctxt
, int seg
)
4864 return get_segment_base(emul_to_vcpu(ctxt
), seg
);
4867 static bool emulator_get_segment(struct x86_emulate_ctxt
*ctxt
, u16
*selector
,
4868 struct desc_struct
*desc
, u32
*base3
,
4871 struct kvm_segment var
;
4873 kvm_get_segment(emul_to_vcpu(ctxt
), &var
, seg
);
4874 *selector
= var
.selector
;
4877 memset(desc
, 0, sizeof(*desc
));
4883 set_desc_limit(desc
, var
.limit
);
4884 set_desc_base(desc
, (unsigned long)var
.base
);
4885 #ifdef CONFIG_X86_64
4887 *base3
= var
.base
>> 32;
4889 desc
->type
= var
.type
;
4891 desc
->dpl
= var
.dpl
;
4892 desc
->p
= var
.present
;
4893 desc
->avl
= var
.avl
;
4901 static void emulator_set_segment(struct x86_emulate_ctxt
*ctxt
, u16 selector
,
4902 struct desc_struct
*desc
, u32 base3
,
4905 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4906 struct kvm_segment var
;
4908 var
.selector
= selector
;
4909 var
.base
= get_desc_base(desc
);
4910 #ifdef CONFIG_X86_64
4911 var
.base
|= ((u64
)base3
) << 32;
4913 var
.limit
= get_desc_limit(desc
);
4915 var
.limit
= (var
.limit
<< 12) | 0xfff;
4916 var
.type
= desc
->type
;
4917 var
.dpl
= desc
->dpl
;
4922 var
.avl
= desc
->avl
;
4923 var
.present
= desc
->p
;
4924 var
.unusable
= !var
.present
;
4927 kvm_set_segment(vcpu
, &var
, seg
);
4931 static int emulator_get_msr(struct x86_emulate_ctxt
*ctxt
,
4932 u32 msr_index
, u64
*pdata
)
4934 struct msr_data msr
;
4937 msr
.index
= msr_index
;
4938 msr
.host_initiated
= false;
4939 r
= kvm_get_msr(emul_to_vcpu(ctxt
), &msr
);
4947 static int emulator_set_msr(struct x86_emulate_ctxt
*ctxt
,
4948 u32 msr_index
, u64 data
)
4950 struct msr_data msr
;
4953 msr
.index
= msr_index
;
4954 msr
.host_initiated
= false;
4955 return kvm_set_msr(emul_to_vcpu(ctxt
), &msr
);
4958 static u64
emulator_get_smbase(struct x86_emulate_ctxt
*ctxt
)
4960 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4962 return vcpu
->arch
.smbase
;
4965 static void emulator_set_smbase(struct x86_emulate_ctxt
*ctxt
, u64 smbase
)
4967 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
4969 vcpu
->arch
.smbase
= smbase
;
4972 static int emulator_check_pmc(struct x86_emulate_ctxt
*ctxt
,
4975 return kvm_pmu_is_valid_msr_idx(emul_to_vcpu(ctxt
), pmc
);
4978 static int emulator_read_pmc(struct x86_emulate_ctxt
*ctxt
,
4979 u32 pmc
, u64
*pdata
)
4981 return kvm_pmu_rdpmc(emul_to_vcpu(ctxt
), pmc
, pdata
);
4984 static void emulator_halt(struct x86_emulate_ctxt
*ctxt
)
4986 emul_to_vcpu(ctxt
)->arch
.halt_request
= 1;
4989 static void emulator_get_fpu(struct x86_emulate_ctxt
*ctxt
)
4992 kvm_load_guest_fpu(emul_to_vcpu(ctxt
));
4994 * CR0.TS may reference the host fpu state, not the guest fpu state,
4995 * so it may be clear at this point.
5000 static void emulator_put_fpu(struct x86_emulate_ctxt
*ctxt
)
5005 static int emulator_intercept(struct x86_emulate_ctxt
*ctxt
,
5006 struct x86_instruction_info
*info
,
5007 enum x86_intercept_stage stage
)
5009 return kvm_x86_ops
->check_intercept(emul_to_vcpu(ctxt
), info
, stage
);
5012 static void emulator_get_cpuid(struct x86_emulate_ctxt
*ctxt
,
5013 u32
*eax
, u32
*ebx
, u32
*ecx
, u32
*edx
)
5015 kvm_cpuid(emul_to_vcpu(ctxt
), eax
, ebx
, ecx
, edx
);
5018 static ulong
emulator_read_gpr(struct x86_emulate_ctxt
*ctxt
, unsigned reg
)
5020 return kvm_register_read(emul_to_vcpu(ctxt
), reg
);
5023 static void emulator_write_gpr(struct x86_emulate_ctxt
*ctxt
, unsigned reg
, ulong val
)
5025 kvm_register_write(emul_to_vcpu(ctxt
), reg
, val
);
5028 static void emulator_set_nmi_mask(struct x86_emulate_ctxt
*ctxt
, bool masked
)
5030 kvm_x86_ops
->set_nmi_mask(emul_to_vcpu(ctxt
), masked
);
5033 static const struct x86_emulate_ops emulate_ops
= {
5034 .read_gpr
= emulator_read_gpr
,
5035 .write_gpr
= emulator_write_gpr
,
5036 .read_std
= kvm_read_guest_virt_system
,
5037 .write_std
= kvm_write_guest_virt_system
,
5038 .read_phys
= kvm_read_guest_phys_system
,
5039 .fetch
= kvm_fetch_guest_virt
,
5040 .read_emulated
= emulator_read_emulated
,
5041 .write_emulated
= emulator_write_emulated
,
5042 .cmpxchg_emulated
= emulator_cmpxchg_emulated
,
5043 .invlpg
= emulator_invlpg
,
5044 .pio_in_emulated
= emulator_pio_in_emulated
,
5045 .pio_out_emulated
= emulator_pio_out_emulated
,
5046 .get_segment
= emulator_get_segment
,
5047 .set_segment
= emulator_set_segment
,
5048 .get_cached_segment_base
= emulator_get_cached_segment_base
,
5049 .get_gdt
= emulator_get_gdt
,
5050 .get_idt
= emulator_get_idt
,
5051 .set_gdt
= emulator_set_gdt
,
5052 .set_idt
= emulator_set_idt
,
5053 .get_cr
= emulator_get_cr
,
5054 .set_cr
= emulator_set_cr
,
5055 .cpl
= emulator_get_cpl
,
5056 .get_dr
= emulator_get_dr
,
5057 .set_dr
= emulator_set_dr
,
5058 .get_smbase
= emulator_get_smbase
,
5059 .set_smbase
= emulator_set_smbase
,
5060 .set_msr
= emulator_set_msr
,
5061 .get_msr
= emulator_get_msr
,
5062 .check_pmc
= emulator_check_pmc
,
5063 .read_pmc
= emulator_read_pmc
,
5064 .halt
= emulator_halt
,
5065 .wbinvd
= emulator_wbinvd
,
5066 .fix_hypercall
= emulator_fix_hypercall
,
5067 .get_fpu
= emulator_get_fpu
,
5068 .put_fpu
= emulator_put_fpu
,
5069 .intercept
= emulator_intercept
,
5070 .get_cpuid
= emulator_get_cpuid
,
5071 .set_nmi_mask
= emulator_set_nmi_mask
,
5074 static void toggle_interruptibility(struct kvm_vcpu
*vcpu
, u32 mask
)
5076 u32 int_shadow
= kvm_x86_ops
->get_interrupt_shadow(vcpu
);
5078 * an sti; sti; sequence only disable interrupts for the first
5079 * instruction. So, if the last instruction, be it emulated or
5080 * not, left the system with the INT_STI flag enabled, it
5081 * means that the last instruction is an sti. We should not
5082 * leave the flag on in this case. The same goes for mov ss
5084 if (int_shadow
& mask
)
5086 if (unlikely(int_shadow
|| mask
)) {
5087 kvm_x86_ops
->set_interrupt_shadow(vcpu
, mask
);
5089 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
5093 static bool inject_emulated_exception(struct kvm_vcpu
*vcpu
)
5095 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5096 if (ctxt
->exception
.vector
== PF_VECTOR
)
5097 return kvm_propagate_fault(vcpu
, &ctxt
->exception
);
5099 if (ctxt
->exception
.error_code_valid
)
5100 kvm_queue_exception_e(vcpu
, ctxt
->exception
.vector
,
5101 ctxt
->exception
.error_code
);
5103 kvm_queue_exception(vcpu
, ctxt
->exception
.vector
);
5107 static void init_emulate_ctxt(struct kvm_vcpu
*vcpu
)
5109 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5112 kvm_x86_ops
->get_cs_db_l_bits(vcpu
, &cs_db
, &cs_l
);
5114 ctxt
->eflags
= kvm_get_rflags(vcpu
);
5115 ctxt
->eip
= kvm_rip_read(vcpu
);
5116 ctxt
->mode
= (!is_protmode(vcpu
)) ? X86EMUL_MODE_REAL
:
5117 (ctxt
->eflags
& X86_EFLAGS_VM
) ? X86EMUL_MODE_VM86
:
5118 (cs_l
&& is_long_mode(vcpu
)) ? X86EMUL_MODE_PROT64
:
5119 cs_db
? X86EMUL_MODE_PROT32
:
5120 X86EMUL_MODE_PROT16
;
5121 BUILD_BUG_ON(HF_GUEST_MASK
!= X86EMUL_GUEST_MASK
);
5122 BUILD_BUG_ON(HF_SMM_MASK
!= X86EMUL_SMM_MASK
);
5123 BUILD_BUG_ON(HF_SMM_INSIDE_NMI_MASK
!= X86EMUL_SMM_INSIDE_NMI_MASK
);
5124 ctxt
->emul_flags
= vcpu
->arch
.hflags
;
5126 init_decode_cache(ctxt
);
5127 vcpu
->arch
.emulate_regs_need_sync_from_vcpu
= false;
5130 int kvm_inject_realmode_interrupt(struct kvm_vcpu
*vcpu
, int irq
, int inc_eip
)
5132 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5135 init_emulate_ctxt(vcpu
);
5139 ctxt
->_eip
= ctxt
->eip
+ inc_eip
;
5140 ret
= emulate_int_real(ctxt
, irq
);
5142 if (ret
!= X86EMUL_CONTINUE
)
5143 return EMULATE_FAIL
;
5145 ctxt
->eip
= ctxt
->_eip
;
5146 kvm_rip_write(vcpu
, ctxt
->eip
);
5147 kvm_set_rflags(vcpu
, ctxt
->eflags
);
5149 if (irq
== NMI_VECTOR
)
5150 vcpu
->arch
.nmi_pending
= 0;
5152 vcpu
->arch
.interrupt
.pending
= false;
5154 return EMULATE_DONE
;
5156 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt
);
5158 static int handle_emulation_failure(struct kvm_vcpu
*vcpu
)
5160 int r
= EMULATE_DONE
;
5162 ++vcpu
->stat
.insn_emulation_fail
;
5163 trace_kvm_emulate_insn_failed(vcpu
);
5164 if (!is_guest_mode(vcpu
) && kvm_x86_ops
->get_cpl(vcpu
) == 0) {
5165 vcpu
->run
->exit_reason
= KVM_EXIT_INTERNAL_ERROR
;
5166 vcpu
->run
->internal
.suberror
= KVM_INTERNAL_ERROR_EMULATION
;
5167 vcpu
->run
->internal
.ndata
= 0;
5170 kvm_queue_exception(vcpu
, UD_VECTOR
);
5175 static bool reexecute_instruction(struct kvm_vcpu
*vcpu
, gva_t cr2
,
5176 bool write_fault_to_shadow_pgtable
,
5182 if (emulation_type
& EMULTYPE_NO_REEXECUTE
)
5185 if (!vcpu
->arch
.mmu
.direct_map
) {
5187 * Write permission should be allowed since only
5188 * write access need to be emulated.
5190 gpa
= kvm_mmu_gva_to_gpa_write(vcpu
, cr2
, NULL
);
5193 * If the mapping is invalid in guest, let cpu retry
5194 * it to generate fault.
5196 if (gpa
== UNMAPPED_GVA
)
5201 * Do not retry the unhandleable instruction if it faults on the
5202 * readonly host memory, otherwise it will goto a infinite loop:
5203 * retry instruction -> write #PF -> emulation fail -> retry
5204 * instruction -> ...
5206 pfn
= gfn_to_pfn(vcpu
->kvm
, gpa_to_gfn(gpa
));
5209 * If the instruction failed on the error pfn, it can not be fixed,
5210 * report the error to userspace.
5212 if (is_error_noslot_pfn(pfn
))
5215 kvm_release_pfn_clean(pfn
);
5217 /* The instructions are well-emulated on direct mmu. */
5218 if (vcpu
->arch
.mmu
.direct_map
) {
5219 unsigned int indirect_shadow_pages
;
5221 spin_lock(&vcpu
->kvm
->mmu_lock
);
5222 indirect_shadow_pages
= vcpu
->kvm
->arch
.indirect_shadow_pages
;
5223 spin_unlock(&vcpu
->kvm
->mmu_lock
);
5225 if (indirect_shadow_pages
)
5226 kvm_mmu_unprotect_page(vcpu
->kvm
, gpa_to_gfn(gpa
));
5232 * if emulation was due to access to shadowed page table
5233 * and it failed try to unshadow page and re-enter the
5234 * guest to let CPU execute the instruction.
5236 kvm_mmu_unprotect_page(vcpu
->kvm
, gpa_to_gfn(gpa
));
5239 * If the access faults on its page table, it can not
5240 * be fixed by unprotecting shadow page and it should
5241 * be reported to userspace.
5243 return !write_fault_to_shadow_pgtable
;
5246 static bool retry_instruction(struct x86_emulate_ctxt
*ctxt
,
5247 unsigned long cr2
, int emulation_type
)
5249 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
5250 unsigned long last_retry_eip
, last_retry_addr
, gpa
= cr2
;
5252 last_retry_eip
= vcpu
->arch
.last_retry_eip
;
5253 last_retry_addr
= vcpu
->arch
.last_retry_addr
;
5256 * If the emulation is caused by #PF and it is non-page_table
5257 * writing instruction, it means the VM-EXIT is caused by shadow
5258 * page protected, we can zap the shadow page and retry this
5259 * instruction directly.
5261 * Note: if the guest uses a non-page-table modifying instruction
5262 * on the PDE that points to the instruction, then we will unmap
5263 * the instruction and go to an infinite loop. So, we cache the
5264 * last retried eip and the last fault address, if we meet the eip
5265 * and the address again, we can break out of the potential infinite
5268 vcpu
->arch
.last_retry_eip
= vcpu
->arch
.last_retry_addr
= 0;
5270 if (!(emulation_type
& EMULTYPE_RETRY
))
5273 if (x86_page_table_writing_insn(ctxt
))
5276 if (ctxt
->eip
== last_retry_eip
&& last_retry_addr
== cr2
)
5279 vcpu
->arch
.last_retry_eip
= ctxt
->eip
;
5280 vcpu
->arch
.last_retry_addr
= cr2
;
5282 if (!vcpu
->arch
.mmu
.direct_map
)
5283 gpa
= kvm_mmu_gva_to_gpa_write(vcpu
, cr2
, NULL
);
5285 kvm_mmu_unprotect_page(vcpu
->kvm
, gpa_to_gfn(gpa
));
5290 static int complete_emulated_mmio(struct kvm_vcpu
*vcpu
);
5291 static int complete_emulated_pio(struct kvm_vcpu
*vcpu
);
5293 static void kvm_smm_changed(struct kvm_vcpu
*vcpu
)
5295 if (!(vcpu
->arch
.hflags
& HF_SMM_MASK
)) {
5296 /* This is a good place to trace that we are exiting SMM. */
5297 trace_kvm_enter_smm(vcpu
->vcpu_id
, vcpu
->arch
.smbase
, false);
5299 if (unlikely(vcpu
->arch
.smi_pending
)) {
5300 kvm_make_request(KVM_REQ_SMI
, vcpu
);
5301 vcpu
->arch
.smi_pending
= 0;
5303 /* Process a latched INIT, if any. */
5304 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
5308 kvm_mmu_reset_context(vcpu
);
5311 static void kvm_set_hflags(struct kvm_vcpu
*vcpu
, unsigned emul_flags
)
5313 unsigned changed
= vcpu
->arch
.hflags
^ emul_flags
;
5315 vcpu
->arch
.hflags
= emul_flags
;
5317 if (changed
& HF_SMM_MASK
)
5318 kvm_smm_changed(vcpu
);
5321 static int kvm_vcpu_check_hw_bp(unsigned long addr
, u32 type
, u32 dr7
,
5330 for (i
= 0; i
< 4; i
++, enable
>>= 2, rwlen
>>= 4)
5331 if ((enable
& 3) && (rwlen
& 15) == type
&& db
[i
] == addr
)
5336 static void kvm_vcpu_check_singlestep(struct kvm_vcpu
*vcpu
, unsigned long rflags
, int *r
)
5338 struct kvm_run
*kvm_run
= vcpu
->run
;
5341 * rflags is the old, "raw" value of the flags. The new value has
5342 * not been saved yet.
5344 * This is correct even for TF set by the guest, because "the
5345 * processor will not generate this exception after the instruction
5346 * that sets the TF flag".
5348 if (unlikely(rflags
& X86_EFLAGS_TF
)) {
5349 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
) {
5350 kvm_run
->debug
.arch
.dr6
= DR6_BS
| DR6_FIXED_1
|
5352 kvm_run
->debug
.arch
.pc
= vcpu
->arch
.singlestep_rip
;
5353 kvm_run
->debug
.arch
.exception
= DB_VECTOR
;
5354 kvm_run
->exit_reason
= KVM_EXIT_DEBUG
;
5355 *r
= EMULATE_USER_EXIT
;
5357 vcpu
->arch
.emulate_ctxt
.eflags
&= ~X86_EFLAGS_TF
;
5359 * "Certain debug exceptions may clear bit 0-3. The
5360 * remaining contents of the DR6 register are never
5361 * cleared by the processor".
5363 vcpu
->arch
.dr6
&= ~15;
5364 vcpu
->arch
.dr6
|= DR6_BS
| DR6_RTM
;
5365 kvm_queue_exception(vcpu
, DB_VECTOR
);
5370 static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu
*vcpu
, int *r
)
5372 if (unlikely(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
) &&
5373 (vcpu
->arch
.guest_debug_dr7
& DR7_BP_EN_MASK
)) {
5374 struct kvm_run
*kvm_run
= vcpu
->run
;
5375 unsigned long eip
= kvm_get_linear_rip(vcpu
);
5376 u32 dr6
= kvm_vcpu_check_hw_bp(eip
, 0,
5377 vcpu
->arch
.guest_debug_dr7
,
5381 kvm_run
->debug
.arch
.dr6
= dr6
| DR6_FIXED_1
| DR6_RTM
;
5382 kvm_run
->debug
.arch
.pc
= eip
;
5383 kvm_run
->debug
.arch
.exception
= DB_VECTOR
;
5384 kvm_run
->exit_reason
= KVM_EXIT_DEBUG
;
5385 *r
= EMULATE_USER_EXIT
;
5390 if (unlikely(vcpu
->arch
.dr7
& DR7_BP_EN_MASK
) &&
5391 !(kvm_get_rflags(vcpu
) & X86_EFLAGS_RF
)) {
5392 unsigned long eip
= kvm_get_linear_rip(vcpu
);
5393 u32 dr6
= kvm_vcpu_check_hw_bp(eip
, 0,
5398 vcpu
->arch
.dr6
&= ~15;
5399 vcpu
->arch
.dr6
|= dr6
| DR6_RTM
;
5400 kvm_queue_exception(vcpu
, DB_VECTOR
);
5409 int x86_emulate_instruction(struct kvm_vcpu
*vcpu
,
5416 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
5417 bool writeback
= true;
5418 bool write_fault_to_spt
= vcpu
->arch
.write_fault_to_shadow_pgtable
;
5421 * Clear write_fault_to_shadow_pgtable here to ensure it is
5424 vcpu
->arch
.write_fault_to_shadow_pgtable
= false;
5425 kvm_clear_exception_queue(vcpu
);
5427 if (!(emulation_type
& EMULTYPE_NO_DECODE
)) {
5428 init_emulate_ctxt(vcpu
);
5431 * We will reenter on the same instruction since
5432 * we do not set complete_userspace_io. This does not
5433 * handle watchpoints yet, those would be handled in
5436 if (kvm_vcpu_check_breakpoint(vcpu
, &r
))
5439 ctxt
->interruptibility
= 0;
5440 ctxt
->have_exception
= false;
5441 ctxt
->exception
.vector
= -1;
5442 ctxt
->perm_ok
= false;
5444 ctxt
->ud
= emulation_type
& EMULTYPE_TRAP_UD
;
5446 r
= x86_decode_insn(ctxt
, insn
, insn_len
);
5448 trace_kvm_emulate_insn_start(vcpu
);
5449 ++vcpu
->stat
.insn_emulation
;
5450 if (r
!= EMULATION_OK
) {
5451 if (emulation_type
& EMULTYPE_TRAP_UD
)
5452 return EMULATE_FAIL
;
5453 if (reexecute_instruction(vcpu
, cr2
, write_fault_to_spt
,
5455 return EMULATE_DONE
;
5456 if (emulation_type
& EMULTYPE_SKIP
)
5457 return EMULATE_FAIL
;
5458 return handle_emulation_failure(vcpu
);
5462 if (emulation_type
& EMULTYPE_SKIP
) {
5463 kvm_rip_write(vcpu
, ctxt
->_eip
);
5464 if (ctxt
->eflags
& X86_EFLAGS_RF
)
5465 kvm_set_rflags(vcpu
, ctxt
->eflags
& ~X86_EFLAGS_RF
);
5466 return EMULATE_DONE
;
5469 if (retry_instruction(ctxt
, cr2
, emulation_type
))
5470 return EMULATE_DONE
;
5472 /* this is needed for vmware backdoor interface to work since it
5473 changes registers values during IO operation */
5474 if (vcpu
->arch
.emulate_regs_need_sync_from_vcpu
) {
5475 vcpu
->arch
.emulate_regs_need_sync_from_vcpu
= false;
5476 emulator_invalidate_register_cache(ctxt
);
5480 r
= x86_emulate_insn(ctxt
);
5482 if (r
== EMULATION_INTERCEPTED
)
5483 return EMULATE_DONE
;
5485 if (r
== EMULATION_FAILED
) {
5486 if (reexecute_instruction(vcpu
, cr2
, write_fault_to_spt
,
5488 return EMULATE_DONE
;
5490 return handle_emulation_failure(vcpu
);
5493 if (ctxt
->have_exception
) {
5495 if (inject_emulated_exception(vcpu
))
5497 } else if (vcpu
->arch
.pio
.count
) {
5498 if (!vcpu
->arch
.pio
.in
) {
5499 /* FIXME: return into emulator if single-stepping. */
5500 vcpu
->arch
.pio
.count
= 0;
5503 vcpu
->arch
.complete_userspace_io
= complete_emulated_pio
;
5505 r
= EMULATE_USER_EXIT
;
5506 } else if (vcpu
->mmio_needed
) {
5507 if (!vcpu
->mmio_is_write
)
5509 r
= EMULATE_USER_EXIT
;
5510 vcpu
->arch
.complete_userspace_io
= complete_emulated_mmio
;
5511 } else if (r
== EMULATION_RESTART
)
5517 unsigned long rflags
= kvm_x86_ops
->get_rflags(vcpu
);
5518 toggle_interruptibility(vcpu
, ctxt
->interruptibility
);
5519 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= false;
5520 if (vcpu
->arch
.hflags
!= ctxt
->emul_flags
)
5521 kvm_set_hflags(vcpu
, ctxt
->emul_flags
);
5522 kvm_rip_write(vcpu
, ctxt
->eip
);
5523 if (r
== EMULATE_DONE
)
5524 kvm_vcpu_check_singlestep(vcpu
, rflags
, &r
);
5525 if (!ctxt
->have_exception
||
5526 exception_type(ctxt
->exception
.vector
) == EXCPT_TRAP
)
5527 __kvm_set_rflags(vcpu
, ctxt
->eflags
);
5530 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
5531 * do nothing, and it will be requested again as soon as
5532 * the shadow expires. But we still need to check here,
5533 * because POPF has no interrupt shadow.
5535 if (unlikely((ctxt
->eflags
& ~rflags
) & X86_EFLAGS_IF
))
5536 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
5538 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= true;
5542 EXPORT_SYMBOL_GPL(x86_emulate_instruction
);
5544 int kvm_fast_pio_out(struct kvm_vcpu
*vcpu
, int size
, unsigned short port
)
5546 unsigned long val
= kvm_register_read(vcpu
, VCPU_REGS_RAX
);
5547 int ret
= emulator_pio_out_emulated(&vcpu
->arch
.emulate_ctxt
,
5548 size
, port
, &val
, 1);
5549 /* do not return to emulator after return from userspace */
5550 vcpu
->arch
.pio
.count
= 0;
5553 EXPORT_SYMBOL_GPL(kvm_fast_pio_out
);
5555 static void tsc_bad(void *info
)
5557 __this_cpu_write(cpu_tsc_khz
, 0);
5560 static void tsc_khz_changed(void *data
)
5562 struct cpufreq_freqs
*freq
= data
;
5563 unsigned long khz
= 0;
5567 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC
))
5568 khz
= cpufreq_quick_get(raw_smp_processor_id());
5571 __this_cpu_write(cpu_tsc_khz
, khz
);
5574 static int kvmclock_cpufreq_notifier(struct notifier_block
*nb
, unsigned long val
,
5577 struct cpufreq_freqs
*freq
= data
;
5579 struct kvm_vcpu
*vcpu
;
5580 int i
, send_ipi
= 0;
5583 * We allow guests to temporarily run on slowing clocks,
5584 * provided we notify them after, or to run on accelerating
5585 * clocks, provided we notify them before. Thus time never
5588 * However, we have a problem. We can't atomically update
5589 * the frequency of a given CPU from this function; it is
5590 * merely a notifier, which can be called from any CPU.
5591 * Changing the TSC frequency at arbitrary points in time
5592 * requires a recomputation of local variables related to
5593 * the TSC for each VCPU. We must flag these local variables
5594 * to be updated and be sure the update takes place with the
5595 * new frequency before any guests proceed.
5597 * Unfortunately, the combination of hotplug CPU and frequency
5598 * change creates an intractable locking scenario; the order
5599 * of when these callouts happen is undefined with respect to
5600 * CPU hotplug, and they can race with each other. As such,
5601 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
5602 * undefined; you can actually have a CPU frequency change take
5603 * place in between the computation of X and the setting of the
5604 * variable. To protect against this problem, all updates of
5605 * the per_cpu tsc_khz variable are done in an interrupt
5606 * protected IPI, and all callers wishing to update the value
5607 * must wait for a synchronous IPI to complete (which is trivial
5608 * if the caller is on the CPU already). This establishes the
5609 * necessary total order on variable updates.
5611 * Note that because a guest time update may take place
5612 * anytime after the setting of the VCPU's request bit, the
5613 * correct TSC value must be set before the request. However,
5614 * to ensure the update actually makes it to any guest which
5615 * starts running in hardware virtualization between the set
5616 * and the acquisition of the spinlock, we must also ping the
5617 * CPU after setting the request bit.
5621 if (val
== CPUFREQ_PRECHANGE
&& freq
->old
> freq
->new)
5623 if (val
== CPUFREQ_POSTCHANGE
&& freq
->old
< freq
->new)
5626 smp_call_function_single(freq
->cpu
, tsc_khz_changed
, freq
, 1);
5628 spin_lock(&kvm_lock
);
5629 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
5630 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
5631 if (vcpu
->cpu
!= freq
->cpu
)
5633 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
5634 if (vcpu
->cpu
!= smp_processor_id())
5638 spin_unlock(&kvm_lock
);
5640 if (freq
->old
< freq
->new && send_ipi
) {
5642 * We upscale the frequency. Must make the guest
5643 * doesn't see old kvmclock values while running with
5644 * the new frequency, otherwise we risk the guest sees
5645 * time go backwards.
5647 * In case we update the frequency for another cpu
5648 * (which might be in guest context) send an interrupt
5649 * to kick the cpu out of guest context. Next time
5650 * guest context is entered kvmclock will be updated,
5651 * so the guest will not see stale values.
5653 smp_call_function_single(freq
->cpu
, tsc_khz_changed
, freq
, 1);
5658 static struct notifier_block kvmclock_cpufreq_notifier_block
= {
5659 .notifier_call
= kvmclock_cpufreq_notifier
5662 static int kvmclock_cpu_notifier(struct notifier_block
*nfb
,
5663 unsigned long action
, void *hcpu
)
5665 unsigned int cpu
= (unsigned long)hcpu
;
5669 case CPU_DOWN_FAILED
:
5670 smp_call_function_single(cpu
, tsc_khz_changed
, NULL
, 1);
5672 case CPU_DOWN_PREPARE
:
5673 smp_call_function_single(cpu
, tsc_bad
, NULL
, 1);
5679 static struct notifier_block kvmclock_cpu_notifier_block
= {
5680 .notifier_call
= kvmclock_cpu_notifier
,
5681 .priority
= -INT_MAX
5684 static void kvm_timer_init(void)
5688 max_tsc_khz
= tsc_khz
;
5690 cpu_notifier_register_begin();
5691 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC
)) {
5692 #ifdef CONFIG_CPU_FREQ
5693 struct cpufreq_policy policy
;
5694 memset(&policy
, 0, sizeof(policy
));
5696 cpufreq_get_policy(&policy
, cpu
);
5697 if (policy
.cpuinfo
.max_freq
)
5698 max_tsc_khz
= policy
.cpuinfo
.max_freq
;
5701 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block
,
5702 CPUFREQ_TRANSITION_NOTIFIER
);
5704 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz
);
5705 for_each_online_cpu(cpu
)
5706 smp_call_function_single(cpu
, tsc_khz_changed
, NULL
, 1);
5708 __register_hotcpu_notifier(&kvmclock_cpu_notifier_block
);
5709 cpu_notifier_register_done();
5713 static DEFINE_PER_CPU(struct kvm_vcpu
*, current_vcpu
);
5715 int kvm_is_in_guest(void)
5717 return __this_cpu_read(current_vcpu
) != NULL
;
5720 static int kvm_is_user_mode(void)
5724 if (__this_cpu_read(current_vcpu
))
5725 user_mode
= kvm_x86_ops
->get_cpl(__this_cpu_read(current_vcpu
));
5727 return user_mode
!= 0;
5730 static unsigned long kvm_get_guest_ip(void)
5732 unsigned long ip
= 0;
5734 if (__this_cpu_read(current_vcpu
))
5735 ip
= kvm_rip_read(__this_cpu_read(current_vcpu
));
5740 static struct perf_guest_info_callbacks kvm_guest_cbs
= {
5741 .is_in_guest
= kvm_is_in_guest
,
5742 .is_user_mode
= kvm_is_user_mode
,
5743 .get_guest_ip
= kvm_get_guest_ip
,
5746 void kvm_before_handle_nmi(struct kvm_vcpu
*vcpu
)
5748 __this_cpu_write(current_vcpu
, vcpu
);
5750 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi
);
5752 void kvm_after_handle_nmi(struct kvm_vcpu
*vcpu
)
5754 __this_cpu_write(current_vcpu
, NULL
);
5756 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi
);
5758 static void kvm_set_mmio_spte_mask(void)
5761 int maxphyaddr
= boot_cpu_data
.x86_phys_bits
;
5764 * Set the reserved bits and the present bit of an paging-structure
5765 * entry to generate page fault with PFER.RSV = 1.
5767 /* Mask the reserved physical address bits. */
5768 mask
= rsvd_bits(maxphyaddr
, 51);
5770 /* Bit 62 is always reserved for 32bit host. */
5771 mask
|= 0x3ull
<< 62;
5773 /* Set the present bit. */
5776 #ifdef CONFIG_X86_64
5778 * If reserved bit is not supported, clear the present bit to disable
5781 if (maxphyaddr
== 52)
5785 kvm_mmu_set_mmio_spte_mask(mask
);
5788 #ifdef CONFIG_X86_64
5789 static void pvclock_gtod_update_fn(struct work_struct
*work
)
5793 struct kvm_vcpu
*vcpu
;
5796 spin_lock(&kvm_lock
);
5797 list_for_each_entry(kvm
, &vm_list
, vm_list
)
5798 kvm_for_each_vcpu(i
, vcpu
, kvm
)
5799 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
5800 atomic_set(&kvm_guest_has_master_clock
, 0);
5801 spin_unlock(&kvm_lock
);
5804 static DECLARE_WORK(pvclock_gtod_work
, pvclock_gtod_update_fn
);
5807 * Notification about pvclock gtod data update.
5809 static int pvclock_gtod_notify(struct notifier_block
*nb
, unsigned long unused
,
5812 struct pvclock_gtod_data
*gtod
= &pvclock_gtod_data
;
5813 struct timekeeper
*tk
= priv
;
5815 update_pvclock_gtod(tk
);
5817 /* disable master clock if host does not trust, or does not
5818 * use, TSC clocksource
5820 if (gtod
->clock
.vclock_mode
!= VCLOCK_TSC
&&
5821 atomic_read(&kvm_guest_has_master_clock
) != 0)
5822 queue_work(system_long_wq
, &pvclock_gtod_work
);
5827 static struct notifier_block pvclock_gtod_notifier
= {
5828 .notifier_call
= pvclock_gtod_notify
,
5832 int kvm_arch_init(void *opaque
)
5835 struct kvm_x86_ops
*ops
= opaque
;
5838 printk(KERN_ERR
"kvm: already loaded the other module\n");
5843 if (!ops
->cpu_has_kvm_support()) {
5844 printk(KERN_ERR
"kvm: no hardware support\n");
5848 if (ops
->disabled_by_bios()) {
5849 printk(KERN_ERR
"kvm: disabled by bios\n");
5855 shared_msrs
= alloc_percpu(struct kvm_shared_msrs
);
5857 printk(KERN_ERR
"kvm: failed to allocate percpu kvm_shared_msrs\n");
5861 r
= kvm_mmu_module_init();
5863 goto out_free_percpu
;
5865 kvm_set_mmio_spte_mask();
5869 kvm_mmu_set_mask_ptes(PT_USER_MASK
, PT_ACCESSED_MASK
,
5870 PT_DIRTY_MASK
, PT64_NX_MASK
, 0);
5874 perf_register_guest_info_callbacks(&kvm_guest_cbs
);
5876 if (boot_cpu_has(X86_FEATURE_XSAVE
))
5877 host_xcr0
= xgetbv(XCR_XFEATURE_ENABLED_MASK
);
5880 #ifdef CONFIG_X86_64
5881 pvclock_gtod_register_notifier(&pvclock_gtod_notifier
);
5887 free_percpu(shared_msrs
);
5892 void kvm_arch_exit(void)
5894 perf_unregister_guest_info_callbacks(&kvm_guest_cbs
);
5896 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC
))
5897 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block
,
5898 CPUFREQ_TRANSITION_NOTIFIER
);
5899 unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block
);
5900 #ifdef CONFIG_X86_64
5901 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier
);
5904 kvm_mmu_module_exit();
5905 free_percpu(shared_msrs
);
5908 int kvm_vcpu_halt(struct kvm_vcpu
*vcpu
)
5910 ++vcpu
->stat
.halt_exits
;
5911 if (lapic_in_kernel(vcpu
)) {
5912 vcpu
->arch
.mp_state
= KVM_MP_STATE_HALTED
;
5915 vcpu
->run
->exit_reason
= KVM_EXIT_HLT
;
5919 EXPORT_SYMBOL_GPL(kvm_vcpu_halt
);
5921 int kvm_emulate_halt(struct kvm_vcpu
*vcpu
)
5923 kvm_x86_ops
->skip_emulated_instruction(vcpu
);
5924 return kvm_vcpu_halt(vcpu
);
5926 EXPORT_SYMBOL_GPL(kvm_emulate_halt
);
5929 * kvm_pv_kick_cpu_op: Kick a vcpu.
5931 * @apicid - apicid of vcpu to be kicked.
5933 static void kvm_pv_kick_cpu_op(struct kvm
*kvm
, unsigned long flags
, int apicid
)
5935 struct kvm_lapic_irq lapic_irq
;
5937 lapic_irq
.shorthand
= 0;
5938 lapic_irq
.dest_mode
= 0;
5939 lapic_irq
.dest_id
= apicid
;
5940 lapic_irq
.msi_redir_hint
= false;
5942 lapic_irq
.delivery_mode
= APIC_DM_REMRD
;
5943 kvm_irq_delivery_to_apic(kvm
, NULL
, &lapic_irq
, NULL
);
5946 void kvm_vcpu_deactivate_apicv(struct kvm_vcpu
*vcpu
)
5948 vcpu
->arch
.apicv_active
= false;
5949 kvm_x86_ops
->refresh_apicv_exec_ctrl(vcpu
);
5952 int kvm_emulate_hypercall(struct kvm_vcpu
*vcpu
)
5954 unsigned long nr
, a0
, a1
, a2
, a3
, ret
;
5955 int op_64_bit
, r
= 1;
5957 kvm_x86_ops
->skip_emulated_instruction(vcpu
);
5959 if (kvm_hv_hypercall_enabled(vcpu
->kvm
))
5960 return kvm_hv_hypercall(vcpu
);
5962 nr
= kvm_register_read(vcpu
, VCPU_REGS_RAX
);
5963 a0
= kvm_register_read(vcpu
, VCPU_REGS_RBX
);
5964 a1
= kvm_register_read(vcpu
, VCPU_REGS_RCX
);
5965 a2
= kvm_register_read(vcpu
, VCPU_REGS_RDX
);
5966 a3
= kvm_register_read(vcpu
, VCPU_REGS_RSI
);
5968 trace_kvm_hypercall(nr
, a0
, a1
, a2
, a3
);
5970 op_64_bit
= is_64_bit_mode(vcpu
);
5979 if (kvm_x86_ops
->get_cpl(vcpu
) != 0) {
5985 case KVM_HC_VAPIC_POLL_IRQ
:
5988 case KVM_HC_KICK_CPU
:
5989 kvm_pv_kick_cpu_op(vcpu
->kvm
, a0
, a1
);
5999 kvm_register_write(vcpu
, VCPU_REGS_RAX
, ret
);
6000 ++vcpu
->stat
.hypercalls
;
6003 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall
);
6005 static int emulator_fix_hypercall(struct x86_emulate_ctxt
*ctxt
)
6007 struct kvm_vcpu
*vcpu
= emul_to_vcpu(ctxt
);
6008 char instruction
[3];
6009 unsigned long rip
= kvm_rip_read(vcpu
);
6011 kvm_x86_ops
->patch_hypercall(vcpu
, instruction
);
6013 return emulator_write_emulated(ctxt
, rip
, instruction
, 3, NULL
);
6016 static int dm_request_for_irq_injection(struct kvm_vcpu
*vcpu
)
6018 return vcpu
->run
->request_interrupt_window
&&
6019 likely(!pic_in_kernel(vcpu
->kvm
));
6022 static void post_kvm_run_save(struct kvm_vcpu
*vcpu
)
6024 struct kvm_run
*kvm_run
= vcpu
->run
;
6026 kvm_run
->if_flag
= (kvm_get_rflags(vcpu
) & X86_EFLAGS_IF
) != 0;
6027 kvm_run
->flags
= is_smm(vcpu
) ? KVM_RUN_X86_SMM
: 0;
6028 kvm_run
->cr8
= kvm_get_cr8(vcpu
);
6029 kvm_run
->apic_base
= kvm_get_apic_base(vcpu
);
6030 kvm_run
->ready_for_interrupt_injection
=
6031 pic_in_kernel(vcpu
->kvm
) ||
6032 kvm_vcpu_ready_for_interrupt_injection(vcpu
);
6035 static void update_cr8_intercept(struct kvm_vcpu
*vcpu
)
6039 if (!kvm_x86_ops
->update_cr8_intercept
)
6042 if (!lapic_in_kernel(vcpu
))
6045 if (vcpu
->arch
.apicv_active
)
6048 if (!vcpu
->arch
.apic
->vapic_addr
)
6049 max_irr
= kvm_lapic_find_highest_irr(vcpu
);
6056 tpr
= kvm_lapic_get_cr8(vcpu
);
6058 kvm_x86_ops
->update_cr8_intercept(vcpu
, tpr
, max_irr
);
6061 static int inject_pending_event(struct kvm_vcpu
*vcpu
, bool req_int_win
)
6065 /* try to reinject previous events if any */
6066 if (vcpu
->arch
.exception
.pending
) {
6067 trace_kvm_inj_exception(vcpu
->arch
.exception
.nr
,
6068 vcpu
->arch
.exception
.has_error_code
,
6069 vcpu
->arch
.exception
.error_code
);
6071 if (exception_type(vcpu
->arch
.exception
.nr
) == EXCPT_FAULT
)
6072 __kvm_set_rflags(vcpu
, kvm_get_rflags(vcpu
) |
6075 if (vcpu
->arch
.exception
.nr
== DB_VECTOR
&&
6076 (vcpu
->arch
.dr7
& DR7_GD
)) {
6077 vcpu
->arch
.dr7
&= ~DR7_GD
;
6078 kvm_update_dr7(vcpu
);
6081 kvm_x86_ops
->queue_exception(vcpu
, vcpu
->arch
.exception
.nr
,
6082 vcpu
->arch
.exception
.has_error_code
,
6083 vcpu
->arch
.exception
.error_code
,
6084 vcpu
->arch
.exception
.reinject
);
6088 if (vcpu
->arch
.nmi_injected
) {
6089 kvm_x86_ops
->set_nmi(vcpu
);
6093 if (vcpu
->arch
.interrupt
.pending
) {
6094 kvm_x86_ops
->set_irq(vcpu
);
6098 if (is_guest_mode(vcpu
) && kvm_x86_ops
->check_nested_events
) {
6099 r
= kvm_x86_ops
->check_nested_events(vcpu
, req_int_win
);
6104 /* try to inject new event if pending */
6105 if (vcpu
->arch
.nmi_pending
&& kvm_x86_ops
->nmi_allowed(vcpu
)) {
6106 --vcpu
->arch
.nmi_pending
;
6107 vcpu
->arch
.nmi_injected
= true;
6108 kvm_x86_ops
->set_nmi(vcpu
);
6109 } else if (kvm_cpu_has_injectable_intr(vcpu
)) {
6111 * Because interrupts can be injected asynchronously, we are
6112 * calling check_nested_events again here to avoid a race condition.
6113 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this
6114 * proposal and current concerns. Perhaps we should be setting
6115 * KVM_REQ_EVENT only on certain events and not unconditionally?
6117 if (is_guest_mode(vcpu
) && kvm_x86_ops
->check_nested_events
) {
6118 r
= kvm_x86_ops
->check_nested_events(vcpu
, req_int_win
);
6122 if (kvm_x86_ops
->interrupt_allowed(vcpu
)) {
6123 kvm_queue_interrupt(vcpu
, kvm_cpu_get_interrupt(vcpu
),
6125 kvm_x86_ops
->set_irq(vcpu
);
6131 static void process_nmi(struct kvm_vcpu
*vcpu
)
6136 * x86 is limited to one NMI running, and one NMI pending after it.
6137 * If an NMI is already in progress, limit further NMIs to just one.
6138 * Otherwise, allow two (and we'll inject the first one immediately).
6140 if (kvm_x86_ops
->get_nmi_mask(vcpu
) || vcpu
->arch
.nmi_injected
)
6143 vcpu
->arch
.nmi_pending
+= atomic_xchg(&vcpu
->arch
.nmi_queued
, 0);
6144 vcpu
->arch
.nmi_pending
= min(vcpu
->arch
.nmi_pending
, limit
);
6145 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
6148 #define put_smstate(type, buf, offset, val) \
6149 *(type *)((buf) + (offset) - 0x7e00) = val
6151 static u32
process_smi_get_segment_flags(struct kvm_segment
*seg
)
6154 flags
|= seg
->g
<< 23;
6155 flags
|= seg
->db
<< 22;
6156 flags
|= seg
->l
<< 21;
6157 flags
|= seg
->avl
<< 20;
6158 flags
|= seg
->present
<< 15;
6159 flags
|= seg
->dpl
<< 13;
6160 flags
|= seg
->s
<< 12;
6161 flags
|= seg
->type
<< 8;
6165 static void process_smi_save_seg_32(struct kvm_vcpu
*vcpu
, char *buf
, int n
)
6167 struct kvm_segment seg
;
6170 kvm_get_segment(vcpu
, &seg
, n
);
6171 put_smstate(u32
, buf
, 0x7fa8 + n
* 4, seg
.selector
);
6174 offset
= 0x7f84 + n
* 12;
6176 offset
= 0x7f2c + (n
- 3) * 12;
6178 put_smstate(u32
, buf
, offset
+ 8, seg
.base
);
6179 put_smstate(u32
, buf
, offset
+ 4, seg
.limit
);
6180 put_smstate(u32
, buf
, offset
, process_smi_get_segment_flags(&seg
));
6183 #ifdef CONFIG_X86_64
6184 static void process_smi_save_seg_64(struct kvm_vcpu
*vcpu
, char *buf
, int n
)
6186 struct kvm_segment seg
;
6190 kvm_get_segment(vcpu
, &seg
, n
);
6191 offset
= 0x7e00 + n
* 16;
6193 flags
= process_smi_get_segment_flags(&seg
) >> 8;
6194 put_smstate(u16
, buf
, offset
, seg
.selector
);
6195 put_smstate(u16
, buf
, offset
+ 2, flags
);
6196 put_smstate(u32
, buf
, offset
+ 4, seg
.limit
);
6197 put_smstate(u64
, buf
, offset
+ 8, seg
.base
);
6201 static void process_smi_save_state_32(struct kvm_vcpu
*vcpu
, char *buf
)
6204 struct kvm_segment seg
;
6208 put_smstate(u32
, buf
, 0x7ffc, kvm_read_cr0(vcpu
));
6209 put_smstate(u32
, buf
, 0x7ff8, kvm_read_cr3(vcpu
));
6210 put_smstate(u32
, buf
, 0x7ff4, kvm_get_rflags(vcpu
));
6211 put_smstate(u32
, buf
, 0x7ff0, kvm_rip_read(vcpu
));
6213 for (i
= 0; i
< 8; i
++)
6214 put_smstate(u32
, buf
, 0x7fd0 + i
* 4, kvm_register_read(vcpu
, i
));
6216 kvm_get_dr(vcpu
, 6, &val
);
6217 put_smstate(u32
, buf
, 0x7fcc, (u32
)val
);
6218 kvm_get_dr(vcpu
, 7, &val
);
6219 put_smstate(u32
, buf
, 0x7fc8, (u32
)val
);
6221 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_TR
);
6222 put_smstate(u32
, buf
, 0x7fc4, seg
.selector
);
6223 put_smstate(u32
, buf
, 0x7f64, seg
.base
);
6224 put_smstate(u32
, buf
, 0x7f60, seg
.limit
);
6225 put_smstate(u32
, buf
, 0x7f5c, process_smi_get_segment_flags(&seg
));
6227 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_LDTR
);
6228 put_smstate(u32
, buf
, 0x7fc0, seg
.selector
);
6229 put_smstate(u32
, buf
, 0x7f80, seg
.base
);
6230 put_smstate(u32
, buf
, 0x7f7c, seg
.limit
);
6231 put_smstate(u32
, buf
, 0x7f78, process_smi_get_segment_flags(&seg
));
6233 kvm_x86_ops
->get_gdt(vcpu
, &dt
);
6234 put_smstate(u32
, buf
, 0x7f74, dt
.address
);
6235 put_smstate(u32
, buf
, 0x7f70, dt
.size
);
6237 kvm_x86_ops
->get_idt(vcpu
, &dt
);
6238 put_smstate(u32
, buf
, 0x7f58, dt
.address
);
6239 put_smstate(u32
, buf
, 0x7f54, dt
.size
);
6241 for (i
= 0; i
< 6; i
++)
6242 process_smi_save_seg_32(vcpu
, buf
, i
);
6244 put_smstate(u32
, buf
, 0x7f14, kvm_read_cr4(vcpu
));
6247 put_smstate(u32
, buf
, 0x7efc, 0x00020000);
6248 put_smstate(u32
, buf
, 0x7ef8, vcpu
->arch
.smbase
);
6251 static void process_smi_save_state_64(struct kvm_vcpu
*vcpu
, char *buf
)
6253 #ifdef CONFIG_X86_64
6255 struct kvm_segment seg
;
6259 for (i
= 0; i
< 16; i
++)
6260 put_smstate(u64
, buf
, 0x7ff8 - i
* 8, kvm_register_read(vcpu
, i
));
6262 put_smstate(u64
, buf
, 0x7f78, kvm_rip_read(vcpu
));
6263 put_smstate(u32
, buf
, 0x7f70, kvm_get_rflags(vcpu
));
6265 kvm_get_dr(vcpu
, 6, &val
);
6266 put_smstate(u64
, buf
, 0x7f68, val
);
6267 kvm_get_dr(vcpu
, 7, &val
);
6268 put_smstate(u64
, buf
, 0x7f60, val
);
6270 put_smstate(u64
, buf
, 0x7f58, kvm_read_cr0(vcpu
));
6271 put_smstate(u64
, buf
, 0x7f50, kvm_read_cr3(vcpu
));
6272 put_smstate(u64
, buf
, 0x7f48, kvm_read_cr4(vcpu
));
6274 put_smstate(u32
, buf
, 0x7f00, vcpu
->arch
.smbase
);
6277 put_smstate(u32
, buf
, 0x7efc, 0x00020064);
6279 put_smstate(u64
, buf
, 0x7ed0, vcpu
->arch
.efer
);
6281 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_TR
);
6282 put_smstate(u16
, buf
, 0x7e90, seg
.selector
);
6283 put_smstate(u16
, buf
, 0x7e92, process_smi_get_segment_flags(&seg
) >> 8);
6284 put_smstate(u32
, buf
, 0x7e94, seg
.limit
);
6285 put_smstate(u64
, buf
, 0x7e98, seg
.base
);
6287 kvm_x86_ops
->get_idt(vcpu
, &dt
);
6288 put_smstate(u32
, buf
, 0x7e84, dt
.size
);
6289 put_smstate(u64
, buf
, 0x7e88, dt
.address
);
6291 kvm_get_segment(vcpu
, &seg
, VCPU_SREG_LDTR
);
6292 put_smstate(u16
, buf
, 0x7e70, seg
.selector
);
6293 put_smstate(u16
, buf
, 0x7e72, process_smi_get_segment_flags(&seg
) >> 8);
6294 put_smstate(u32
, buf
, 0x7e74, seg
.limit
);
6295 put_smstate(u64
, buf
, 0x7e78, seg
.base
);
6297 kvm_x86_ops
->get_gdt(vcpu
, &dt
);
6298 put_smstate(u32
, buf
, 0x7e64, dt
.size
);
6299 put_smstate(u64
, buf
, 0x7e68, dt
.address
);
6301 for (i
= 0; i
< 6; i
++)
6302 process_smi_save_seg_64(vcpu
, buf
, i
);
6308 static void process_smi(struct kvm_vcpu
*vcpu
)
6310 struct kvm_segment cs
, ds
;
6316 vcpu
->arch
.smi_pending
= true;
6320 trace_kvm_enter_smm(vcpu
->vcpu_id
, vcpu
->arch
.smbase
, true);
6321 vcpu
->arch
.hflags
|= HF_SMM_MASK
;
6322 memset(buf
, 0, 512);
6323 if (guest_cpuid_has_longmode(vcpu
))
6324 process_smi_save_state_64(vcpu
, buf
);
6326 process_smi_save_state_32(vcpu
, buf
);
6328 kvm_vcpu_write_guest(vcpu
, vcpu
->arch
.smbase
+ 0xfe00, buf
, sizeof(buf
));
6330 if (kvm_x86_ops
->get_nmi_mask(vcpu
))
6331 vcpu
->arch
.hflags
|= HF_SMM_INSIDE_NMI_MASK
;
6333 kvm_x86_ops
->set_nmi_mask(vcpu
, true);
6335 kvm_set_rflags(vcpu
, X86_EFLAGS_FIXED
);
6336 kvm_rip_write(vcpu
, 0x8000);
6338 cr0
= vcpu
->arch
.cr0
& ~(X86_CR0_PE
| X86_CR0_EM
| X86_CR0_TS
| X86_CR0_PG
);
6339 kvm_x86_ops
->set_cr0(vcpu
, cr0
);
6340 vcpu
->arch
.cr0
= cr0
;
6342 kvm_x86_ops
->set_cr4(vcpu
, 0);
6344 /* Undocumented: IDT limit is set to zero on entry to SMM. */
6345 dt
.address
= dt
.size
= 0;
6346 kvm_x86_ops
->set_idt(vcpu
, &dt
);
6348 __kvm_set_dr(vcpu
, 7, DR7_FIXED_1
);
6350 cs
.selector
= (vcpu
->arch
.smbase
>> 4) & 0xffff;
6351 cs
.base
= vcpu
->arch
.smbase
;
6356 cs
.limit
= ds
.limit
= 0xffffffff;
6357 cs
.type
= ds
.type
= 0x3;
6358 cs
.dpl
= ds
.dpl
= 0;
6363 cs
.avl
= ds
.avl
= 0;
6364 cs
.present
= ds
.present
= 1;
6365 cs
.unusable
= ds
.unusable
= 0;
6366 cs
.padding
= ds
.padding
= 0;
6368 kvm_set_segment(vcpu
, &cs
, VCPU_SREG_CS
);
6369 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_DS
);
6370 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_ES
);
6371 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_FS
);
6372 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_GS
);
6373 kvm_set_segment(vcpu
, &ds
, VCPU_SREG_SS
);
6375 if (guest_cpuid_has_longmode(vcpu
))
6376 kvm_x86_ops
->set_efer(vcpu
, 0);
6378 kvm_update_cpuid(vcpu
);
6379 kvm_mmu_reset_context(vcpu
);
6382 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
6384 kvm_make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
6387 static void vcpu_scan_ioapic(struct kvm_vcpu
*vcpu
)
6389 u64 eoi_exit_bitmap
[4];
6391 if (!kvm_apic_hw_enabled(vcpu
->arch
.apic
))
6394 bitmap_zero(vcpu
->arch
.ioapic_handled_vectors
, 256);
6396 if (irqchip_split(vcpu
->kvm
))
6397 kvm_scan_ioapic_routes(vcpu
, vcpu
->arch
.ioapic_handled_vectors
);
6399 if (vcpu
->arch
.apicv_active
)
6400 kvm_x86_ops
->sync_pir_to_irr(vcpu
);
6401 kvm_ioapic_scan_entry(vcpu
, vcpu
->arch
.ioapic_handled_vectors
);
6403 bitmap_or((ulong
*)eoi_exit_bitmap
, vcpu
->arch
.ioapic_handled_vectors
,
6404 vcpu_to_synic(vcpu
)->vec_bitmap
, 256);
6405 kvm_x86_ops
->load_eoi_exitmap(vcpu
, eoi_exit_bitmap
);
6408 static void kvm_vcpu_flush_tlb(struct kvm_vcpu
*vcpu
)
6410 ++vcpu
->stat
.tlb_flush
;
6411 kvm_x86_ops
->tlb_flush(vcpu
);
6414 void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu
*vcpu
)
6416 struct page
*page
= NULL
;
6418 if (!lapic_in_kernel(vcpu
))
6421 if (!kvm_x86_ops
->set_apic_access_page_addr
)
6424 page
= gfn_to_page(vcpu
->kvm
, APIC_DEFAULT_PHYS_BASE
>> PAGE_SHIFT
);
6425 if (is_error_page(page
))
6427 kvm_x86_ops
->set_apic_access_page_addr(vcpu
, page_to_phys(page
));
6430 * Do not pin apic access page in memory, the MMU notifier
6431 * will call us again if it is migrated or swapped out.
6435 EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page
);
6437 void kvm_arch_mmu_notifier_invalidate_page(struct kvm
*kvm
,
6438 unsigned long address
)
6441 * The physical address of apic access page is stored in the VMCS.
6442 * Update it when it becomes invalid.
6444 if (address
== gfn_to_hva(kvm
, APIC_DEFAULT_PHYS_BASE
>> PAGE_SHIFT
))
6445 kvm_make_all_cpus_request(kvm
, KVM_REQ_APIC_PAGE_RELOAD
);
6449 * Returns 1 to let vcpu_run() continue the guest execution loop without
6450 * exiting to the userspace. Otherwise, the value will be returned to the
6453 static int vcpu_enter_guest(struct kvm_vcpu
*vcpu
)
6457 dm_request_for_irq_injection(vcpu
) &&
6458 kvm_cpu_accept_dm_intr(vcpu
);
6460 bool req_immediate_exit
= false;
6462 if (vcpu
->requests
) {
6463 if (kvm_check_request(KVM_REQ_MMU_RELOAD
, vcpu
))
6464 kvm_mmu_unload(vcpu
);
6465 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER
, vcpu
))
6466 __kvm_migrate_timers(vcpu
);
6467 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
))
6468 kvm_gen_update_masterclock(vcpu
->kvm
);
6469 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE
, vcpu
))
6470 kvm_gen_kvmclock_update(vcpu
);
6471 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE
, vcpu
)) {
6472 r
= kvm_guest_time_update(vcpu
);
6476 if (kvm_check_request(KVM_REQ_MMU_SYNC
, vcpu
))
6477 kvm_mmu_sync_roots(vcpu
);
6478 if (kvm_check_request(KVM_REQ_TLB_FLUSH
, vcpu
))
6479 kvm_vcpu_flush_tlb(vcpu
);
6480 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS
, vcpu
)) {
6481 vcpu
->run
->exit_reason
= KVM_EXIT_TPR_ACCESS
;
6485 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT
, vcpu
)) {
6486 vcpu
->run
->exit_reason
= KVM_EXIT_SHUTDOWN
;
6490 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU
, vcpu
)) {
6491 vcpu
->fpu_active
= 0;
6492 kvm_x86_ops
->fpu_deactivate(vcpu
);
6494 if (kvm_check_request(KVM_REQ_APF_HALT
, vcpu
)) {
6495 /* Page is swapped out. Do synthetic halt */
6496 vcpu
->arch
.apf
.halted
= true;
6500 if (kvm_check_request(KVM_REQ_STEAL_UPDATE
, vcpu
))
6501 record_steal_time(vcpu
);
6502 if (kvm_check_request(KVM_REQ_SMI
, vcpu
))
6504 if (kvm_check_request(KVM_REQ_NMI
, vcpu
))
6506 if (kvm_check_request(KVM_REQ_PMU
, vcpu
))
6507 kvm_pmu_handle_event(vcpu
);
6508 if (kvm_check_request(KVM_REQ_PMI
, vcpu
))
6509 kvm_pmu_deliver_pmi(vcpu
);
6510 if (kvm_check_request(KVM_REQ_IOAPIC_EOI_EXIT
, vcpu
)) {
6511 BUG_ON(vcpu
->arch
.pending_ioapic_eoi
> 255);
6512 if (test_bit(vcpu
->arch
.pending_ioapic_eoi
,
6513 vcpu
->arch
.ioapic_handled_vectors
)) {
6514 vcpu
->run
->exit_reason
= KVM_EXIT_IOAPIC_EOI
;
6515 vcpu
->run
->eoi
.vector
=
6516 vcpu
->arch
.pending_ioapic_eoi
;
6521 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC
, vcpu
))
6522 vcpu_scan_ioapic(vcpu
);
6523 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD
, vcpu
))
6524 kvm_vcpu_reload_apic_access_page(vcpu
);
6525 if (kvm_check_request(KVM_REQ_HV_CRASH
, vcpu
)) {
6526 vcpu
->run
->exit_reason
= KVM_EXIT_SYSTEM_EVENT
;
6527 vcpu
->run
->system_event
.type
= KVM_SYSTEM_EVENT_CRASH
;
6531 if (kvm_check_request(KVM_REQ_HV_RESET
, vcpu
)) {
6532 vcpu
->run
->exit_reason
= KVM_EXIT_SYSTEM_EVENT
;
6533 vcpu
->run
->system_event
.type
= KVM_SYSTEM_EVENT_RESET
;
6537 if (kvm_check_request(KVM_REQ_HV_EXIT
, vcpu
)) {
6538 vcpu
->run
->exit_reason
= KVM_EXIT_HYPERV
;
6539 vcpu
->run
->hyperv
= vcpu
->arch
.hyperv
.exit
;
6545 * KVM_REQ_HV_STIMER has to be processed after
6546 * KVM_REQ_CLOCK_UPDATE, because Hyper-V SynIC timers
6547 * depend on the guest clock being up-to-date
6549 if (kvm_check_request(KVM_REQ_HV_STIMER
, vcpu
))
6550 kvm_hv_process_stimers(vcpu
);
6554 * KVM_REQ_EVENT is not set when posted interrupts are set by
6555 * VT-d hardware, so we have to update RVI unconditionally.
6557 if (kvm_lapic_enabled(vcpu
)) {
6559 * Update architecture specific hints for APIC
6560 * virtual interrupt delivery.
6562 if (vcpu
->arch
.apicv_active
)
6563 kvm_x86_ops
->hwapic_irr_update(vcpu
,
6564 kvm_lapic_find_highest_irr(vcpu
));
6567 if (kvm_check_request(KVM_REQ_EVENT
, vcpu
) || req_int_win
) {
6568 kvm_apic_accept_events(vcpu
);
6569 if (vcpu
->arch
.mp_state
== KVM_MP_STATE_INIT_RECEIVED
) {
6574 if (inject_pending_event(vcpu
, req_int_win
) != 0)
6575 req_immediate_exit
= true;
6576 /* enable NMI/IRQ window open exits if needed */
6578 if (vcpu
->arch
.nmi_pending
)
6579 kvm_x86_ops
->enable_nmi_window(vcpu
);
6580 if (kvm_cpu_has_injectable_intr(vcpu
) || req_int_win
)
6581 kvm_x86_ops
->enable_irq_window(vcpu
);
6584 if (kvm_lapic_enabled(vcpu
)) {
6585 update_cr8_intercept(vcpu
);
6586 kvm_lapic_sync_to_vapic(vcpu
);
6590 r
= kvm_mmu_reload(vcpu
);
6592 goto cancel_injection
;
6597 kvm_x86_ops
->prepare_guest_switch(vcpu
);
6598 if (vcpu
->fpu_active
)
6599 kvm_load_guest_fpu(vcpu
);
6600 vcpu
->mode
= IN_GUEST_MODE
;
6602 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
6605 * We should set ->mode before check ->requests,
6606 * Please see the comment in kvm_make_all_cpus_request.
6607 * This also orders the write to mode from any reads
6608 * to the page tables done while the VCPU is running.
6609 * Please see the comment in kvm_flush_remote_tlbs.
6611 smp_mb__after_srcu_read_unlock();
6613 local_irq_disable();
6615 if (vcpu
->mode
== EXITING_GUEST_MODE
|| vcpu
->requests
6616 || need_resched() || signal_pending(current
)) {
6617 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
6621 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
6623 goto cancel_injection
;
6626 kvm_load_guest_xcr0(vcpu
);
6628 if (req_immediate_exit
)
6629 smp_send_reschedule(vcpu
->cpu
);
6631 trace_kvm_entry(vcpu
->vcpu_id
);
6632 wait_lapic_expire(vcpu
);
6633 __kvm_guest_enter();
6635 if (unlikely(vcpu
->arch
.switch_db_regs
)) {
6637 set_debugreg(vcpu
->arch
.eff_db
[0], 0);
6638 set_debugreg(vcpu
->arch
.eff_db
[1], 1);
6639 set_debugreg(vcpu
->arch
.eff_db
[2], 2);
6640 set_debugreg(vcpu
->arch
.eff_db
[3], 3);
6641 set_debugreg(vcpu
->arch
.dr6
, 6);
6642 vcpu
->arch
.switch_db_regs
&= ~KVM_DEBUGREG_RELOAD
;
6645 kvm_x86_ops
->run(vcpu
);
6648 * Do this here before restoring debug registers on the host. And
6649 * since we do this before handling the vmexit, a DR access vmexit
6650 * can (a) read the correct value of the debug registers, (b) set
6651 * KVM_DEBUGREG_WONT_EXIT again.
6653 if (unlikely(vcpu
->arch
.switch_db_regs
& KVM_DEBUGREG_WONT_EXIT
)) {
6654 WARN_ON(vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
);
6655 kvm_x86_ops
->sync_dirty_debug_regs(vcpu
);
6656 kvm_update_dr0123(vcpu
);
6657 kvm_update_dr6(vcpu
);
6658 kvm_update_dr7(vcpu
);
6659 vcpu
->arch
.switch_db_regs
&= ~KVM_DEBUGREG_RELOAD
;
6663 * If the guest has used debug registers, at least dr7
6664 * will be disabled while returning to the host.
6665 * If we don't have active breakpoints in the host, we don't
6666 * care about the messed up debug address registers. But if
6667 * we have some of them active, restore the old state.
6669 if (hw_breakpoint_active())
6670 hw_breakpoint_restore();
6672 vcpu
->arch
.last_guest_tsc
= kvm_read_l1_tsc(vcpu
, rdtsc());
6674 vcpu
->mode
= OUTSIDE_GUEST_MODE
;
6677 kvm_put_guest_xcr0(vcpu
);
6679 /* Interrupt is enabled by handle_external_intr() */
6680 kvm_x86_ops
->handle_external_intr(vcpu
);
6685 * We must have an instruction between local_irq_enable() and
6686 * kvm_guest_exit(), so the timer interrupt isn't delayed by
6687 * the interrupt shadow. The stat.exits increment will do nicely.
6688 * But we need to prevent reordering, hence this barrier():
6696 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
6699 * Profile KVM exit RIPs:
6701 if (unlikely(prof_on
== KVM_PROFILING
)) {
6702 unsigned long rip
= kvm_rip_read(vcpu
);
6703 profile_hit(KVM_PROFILING
, (void *)rip
);
6706 if (unlikely(vcpu
->arch
.tsc_always_catchup
))
6707 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
6709 if (vcpu
->arch
.apic_attention
)
6710 kvm_lapic_sync_from_vapic(vcpu
);
6712 r
= kvm_x86_ops
->handle_exit(vcpu
);
6716 kvm_x86_ops
->cancel_injection(vcpu
);
6717 if (unlikely(vcpu
->arch
.apic_attention
))
6718 kvm_lapic_sync_from_vapic(vcpu
);
6723 static inline int vcpu_block(struct kvm
*kvm
, struct kvm_vcpu
*vcpu
)
6725 if (!kvm_arch_vcpu_runnable(vcpu
) &&
6726 (!kvm_x86_ops
->pre_block
|| kvm_x86_ops
->pre_block(vcpu
) == 0)) {
6727 srcu_read_unlock(&kvm
->srcu
, vcpu
->srcu_idx
);
6728 kvm_vcpu_block(vcpu
);
6729 vcpu
->srcu_idx
= srcu_read_lock(&kvm
->srcu
);
6731 if (kvm_x86_ops
->post_block
)
6732 kvm_x86_ops
->post_block(vcpu
);
6734 if (!kvm_check_request(KVM_REQ_UNHALT
, vcpu
))
6738 kvm_apic_accept_events(vcpu
);
6739 switch(vcpu
->arch
.mp_state
) {
6740 case KVM_MP_STATE_HALTED
:
6741 vcpu
->arch
.pv
.pv_unhalted
= false;
6742 vcpu
->arch
.mp_state
=
6743 KVM_MP_STATE_RUNNABLE
;
6744 case KVM_MP_STATE_RUNNABLE
:
6745 vcpu
->arch
.apf
.halted
= false;
6747 case KVM_MP_STATE_INIT_RECEIVED
:
6756 static inline bool kvm_vcpu_running(struct kvm_vcpu
*vcpu
)
6758 return (vcpu
->arch
.mp_state
== KVM_MP_STATE_RUNNABLE
&&
6759 !vcpu
->arch
.apf
.halted
);
6762 static int vcpu_run(struct kvm_vcpu
*vcpu
)
6765 struct kvm
*kvm
= vcpu
->kvm
;
6767 vcpu
->srcu_idx
= srcu_read_lock(&kvm
->srcu
);
6770 if (kvm_vcpu_running(vcpu
)) {
6771 r
= vcpu_enter_guest(vcpu
);
6773 r
= vcpu_block(kvm
, vcpu
);
6779 clear_bit(KVM_REQ_PENDING_TIMER
, &vcpu
->requests
);
6780 if (kvm_cpu_has_pending_timer(vcpu
))
6781 kvm_inject_pending_timer_irqs(vcpu
);
6783 if (dm_request_for_irq_injection(vcpu
) &&
6784 kvm_vcpu_ready_for_interrupt_injection(vcpu
)) {
6786 vcpu
->run
->exit_reason
= KVM_EXIT_IRQ_WINDOW_OPEN
;
6787 ++vcpu
->stat
.request_irq_exits
;
6791 kvm_check_async_pf_completion(vcpu
);
6793 if (signal_pending(current
)) {
6795 vcpu
->run
->exit_reason
= KVM_EXIT_INTR
;
6796 ++vcpu
->stat
.signal_exits
;
6799 if (need_resched()) {
6800 srcu_read_unlock(&kvm
->srcu
, vcpu
->srcu_idx
);
6802 vcpu
->srcu_idx
= srcu_read_lock(&kvm
->srcu
);
6806 srcu_read_unlock(&kvm
->srcu
, vcpu
->srcu_idx
);
6811 static inline int complete_emulated_io(struct kvm_vcpu
*vcpu
)
6814 vcpu
->srcu_idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
6815 r
= emulate_instruction(vcpu
, EMULTYPE_NO_DECODE
);
6816 srcu_read_unlock(&vcpu
->kvm
->srcu
, vcpu
->srcu_idx
);
6817 if (r
!= EMULATE_DONE
)
6822 static int complete_emulated_pio(struct kvm_vcpu
*vcpu
)
6824 BUG_ON(!vcpu
->arch
.pio
.count
);
6826 return complete_emulated_io(vcpu
);
6830 * Implements the following, as a state machine:
6834 * for each mmio piece in the fragment
6842 * for each mmio piece in the fragment
6847 static int complete_emulated_mmio(struct kvm_vcpu
*vcpu
)
6849 struct kvm_run
*run
= vcpu
->run
;
6850 struct kvm_mmio_fragment
*frag
;
6853 BUG_ON(!vcpu
->mmio_needed
);
6855 /* Complete previous fragment */
6856 frag
= &vcpu
->mmio_fragments
[vcpu
->mmio_cur_fragment
];
6857 len
= min(8u, frag
->len
);
6858 if (!vcpu
->mmio_is_write
)
6859 memcpy(frag
->data
, run
->mmio
.data
, len
);
6861 if (frag
->len
<= 8) {
6862 /* Switch to the next fragment. */
6864 vcpu
->mmio_cur_fragment
++;
6866 /* Go forward to the next mmio piece. */
6872 if (vcpu
->mmio_cur_fragment
>= vcpu
->mmio_nr_fragments
) {
6873 vcpu
->mmio_needed
= 0;
6875 /* FIXME: return into emulator if single-stepping. */
6876 if (vcpu
->mmio_is_write
)
6878 vcpu
->mmio_read_completed
= 1;
6879 return complete_emulated_io(vcpu
);
6882 run
->exit_reason
= KVM_EXIT_MMIO
;
6883 run
->mmio
.phys_addr
= frag
->gpa
;
6884 if (vcpu
->mmio_is_write
)
6885 memcpy(run
->mmio
.data
, frag
->data
, min(8u, frag
->len
));
6886 run
->mmio
.len
= min(8u, frag
->len
);
6887 run
->mmio
.is_write
= vcpu
->mmio_is_write
;
6888 vcpu
->arch
.complete_userspace_io
= complete_emulated_mmio
;
6893 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu
*vcpu
, struct kvm_run
*kvm_run
)
6895 struct fpu
*fpu
= ¤t
->thread
.fpu
;
6899 fpu__activate_curr(fpu
);
6901 if (vcpu
->sigset_active
)
6902 sigprocmask(SIG_SETMASK
, &vcpu
->sigset
, &sigsaved
);
6904 if (unlikely(vcpu
->arch
.mp_state
== KVM_MP_STATE_UNINITIALIZED
)) {
6905 kvm_vcpu_block(vcpu
);
6906 kvm_apic_accept_events(vcpu
);
6907 clear_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
6912 /* re-sync apic's tpr */
6913 if (!lapic_in_kernel(vcpu
)) {
6914 if (kvm_set_cr8(vcpu
, kvm_run
->cr8
) != 0) {
6920 if (unlikely(vcpu
->arch
.complete_userspace_io
)) {
6921 int (*cui
)(struct kvm_vcpu
*) = vcpu
->arch
.complete_userspace_io
;
6922 vcpu
->arch
.complete_userspace_io
= NULL
;
6927 WARN_ON(vcpu
->arch
.pio
.count
|| vcpu
->mmio_needed
);
6932 post_kvm_run_save(vcpu
);
6933 if (vcpu
->sigset_active
)
6934 sigprocmask(SIG_SETMASK
, &sigsaved
, NULL
);
6939 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu
*vcpu
, struct kvm_regs
*regs
)
6941 if (vcpu
->arch
.emulate_regs_need_sync_to_vcpu
) {
6943 * We are here if userspace calls get_regs() in the middle of
6944 * instruction emulation. Registers state needs to be copied
6945 * back from emulation context to vcpu. Userspace shouldn't do
6946 * that usually, but some bad designed PV devices (vmware
6947 * backdoor interface) need this to work
6949 emulator_writeback_register_cache(&vcpu
->arch
.emulate_ctxt
);
6950 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= false;
6952 regs
->rax
= kvm_register_read(vcpu
, VCPU_REGS_RAX
);
6953 regs
->rbx
= kvm_register_read(vcpu
, VCPU_REGS_RBX
);
6954 regs
->rcx
= kvm_register_read(vcpu
, VCPU_REGS_RCX
);
6955 regs
->rdx
= kvm_register_read(vcpu
, VCPU_REGS_RDX
);
6956 regs
->rsi
= kvm_register_read(vcpu
, VCPU_REGS_RSI
);
6957 regs
->rdi
= kvm_register_read(vcpu
, VCPU_REGS_RDI
);
6958 regs
->rsp
= kvm_register_read(vcpu
, VCPU_REGS_RSP
);
6959 regs
->rbp
= kvm_register_read(vcpu
, VCPU_REGS_RBP
);
6960 #ifdef CONFIG_X86_64
6961 regs
->r8
= kvm_register_read(vcpu
, VCPU_REGS_R8
);
6962 regs
->r9
= kvm_register_read(vcpu
, VCPU_REGS_R9
);
6963 regs
->r10
= kvm_register_read(vcpu
, VCPU_REGS_R10
);
6964 regs
->r11
= kvm_register_read(vcpu
, VCPU_REGS_R11
);
6965 regs
->r12
= kvm_register_read(vcpu
, VCPU_REGS_R12
);
6966 regs
->r13
= kvm_register_read(vcpu
, VCPU_REGS_R13
);
6967 regs
->r14
= kvm_register_read(vcpu
, VCPU_REGS_R14
);
6968 regs
->r15
= kvm_register_read(vcpu
, VCPU_REGS_R15
);
6971 regs
->rip
= kvm_rip_read(vcpu
);
6972 regs
->rflags
= kvm_get_rflags(vcpu
);
6977 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu
*vcpu
, struct kvm_regs
*regs
)
6979 vcpu
->arch
.emulate_regs_need_sync_from_vcpu
= true;
6980 vcpu
->arch
.emulate_regs_need_sync_to_vcpu
= false;
6982 kvm_register_write(vcpu
, VCPU_REGS_RAX
, regs
->rax
);
6983 kvm_register_write(vcpu
, VCPU_REGS_RBX
, regs
->rbx
);
6984 kvm_register_write(vcpu
, VCPU_REGS_RCX
, regs
->rcx
);
6985 kvm_register_write(vcpu
, VCPU_REGS_RDX
, regs
->rdx
);
6986 kvm_register_write(vcpu
, VCPU_REGS_RSI
, regs
->rsi
);
6987 kvm_register_write(vcpu
, VCPU_REGS_RDI
, regs
->rdi
);
6988 kvm_register_write(vcpu
, VCPU_REGS_RSP
, regs
->rsp
);
6989 kvm_register_write(vcpu
, VCPU_REGS_RBP
, regs
->rbp
);
6990 #ifdef CONFIG_X86_64
6991 kvm_register_write(vcpu
, VCPU_REGS_R8
, regs
->r8
);
6992 kvm_register_write(vcpu
, VCPU_REGS_R9
, regs
->r9
);
6993 kvm_register_write(vcpu
, VCPU_REGS_R10
, regs
->r10
);
6994 kvm_register_write(vcpu
, VCPU_REGS_R11
, regs
->r11
);
6995 kvm_register_write(vcpu
, VCPU_REGS_R12
, regs
->r12
);
6996 kvm_register_write(vcpu
, VCPU_REGS_R13
, regs
->r13
);
6997 kvm_register_write(vcpu
, VCPU_REGS_R14
, regs
->r14
);
6998 kvm_register_write(vcpu
, VCPU_REGS_R15
, regs
->r15
);
7001 kvm_rip_write(vcpu
, regs
->rip
);
7002 kvm_set_rflags(vcpu
, regs
->rflags
);
7004 vcpu
->arch
.exception
.pending
= false;
7006 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7011 void kvm_get_cs_db_l_bits(struct kvm_vcpu
*vcpu
, int *db
, int *l
)
7013 struct kvm_segment cs
;
7015 kvm_get_segment(vcpu
, &cs
, VCPU_SREG_CS
);
7019 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits
);
7021 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu
*vcpu
,
7022 struct kvm_sregs
*sregs
)
7026 kvm_get_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
7027 kvm_get_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
7028 kvm_get_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
7029 kvm_get_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
7030 kvm_get_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
7031 kvm_get_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
7033 kvm_get_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
7034 kvm_get_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
7036 kvm_x86_ops
->get_idt(vcpu
, &dt
);
7037 sregs
->idt
.limit
= dt
.size
;
7038 sregs
->idt
.base
= dt
.address
;
7039 kvm_x86_ops
->get_gdt(vcpu
, &dt
);
7040 sregs
->gdt
.limit
= dt
.size
;
7041 sregs
->gdt
.base
= dt
.address
;
7043 sregs
->cr0
= kvm_read_cr0(vcpu
);
7044 sregs
->cr2
= vcpu
->arch
.cr2
;
7045 sregs
->cr3
= kvm_read_cr3(vcpu
);
7046 sregs
->cr4
= kvm_read_cr4(vcpu
);
7047 sregs
->cr8
= kvm_get_cr8(vcpu
);
7048 sregs
->efer
= vcpu
->arch
.efer
;
7049 sregs
->apic_base
= kvm_get_apic_base(vcpu
);
7051 memset(sregs
->interrupt_bitmap
, 0, sizeof sregs
->interrupt_bitmap
);
7053 if (vcpu
->arch
.interrupt
.pending
&& !vcpu
->arch
.interrupt
.soft
)
7054 set_bit(vcpu
->arch
.interrupt
.nr
,
7055 (unsigned long *)sregs
->interrupt_bitmap
);
7060 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu
*vcpu
,
7061 struct kvm_mp_state
*mp_state
)
7063 kvm_apic_accept_events(vcpu
);
7064 if (vcpu
->arch
.mp_state
== KVM_MP_STATE_HALTED
&&
7065 vcpu
->arch
.pv
.pv_unhalted
)
7066 mp_state
->mp_state
= KVM_MP_STATE_RUNNABLE
;
7068 mp_state
->mp_state
= vcpu
->arch
.mp_state
;
7073 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu
*vcpu
,
7074 struct kvm_mp_state
*mp_state
)
7076 if (!lapic_in_kernel(vcpu
) &&
7077 mp_state
->mp_state
!= KVM_MP_STATE_RUNNABLE
)
7080 if (mp_state
->mp_state
== KVM_MP_STATE_SIPI_RECEIVED
) {
7081 vcpu
->arch
.mp_state
= KVM_MP_STATE_INIT_RECEIVED
;
7082 set_bit(KVM_APIC_SIPI
, &vcpu
->arch
.apic
->pending_events
);
7084 vcpu
->arch
.mp_state
= mp_state
->mp_state
;
7085 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7089 int kvm_task_switch(struct kvm_vcpu
*vcpu
, u16 tss_selector
, int idt_index
,
7090 int reason
, bool has_error_code
, u32 error_code
)
7092 struct x86_emulate_ctxt
*ctxt
= &vcpu
->arch
.emulate_ctxt
;
7095 init_emulate_ctxt(vcpu
);
7097 ret
= emulator_task_switch(ctxt
, tss_selector
, idt_index
, reason
,
7098 has_error_code
, error_code
);
7101 return EMULATE_FAIL
;
7103 kvm_rip_write(vcpu
, ctxt
->eip
);
7104 kvm_set_rflags(vcpu
, ctxt
->eflags
);
7105 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7106 return EMULATE_DONE
;
7108 EXPORT_SYMBOL_GPL(kvm_task_switch
);
7110 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu
*vcpu
,
7111 struct kvm_sregs
*sregs
)
7113 struct msr_data apic_base_msr
;
7114 int mmu_reset_needed
= 0;
7115 int pending_vec
, max_bits
, idx
;
7118 if (!guest_cpuid_has_xsave(vcpu
) && (sregs
->cr4
& X86_CR4_OSXSAVE
))
7121 dt
.size
= sregs
->idt
.limit
;
7122 dt
.address
= sregs
->idt
.base
;
7123 kvm_x86_ops
->set_idt(vcpu
, &dt
);
7124 dt
.size
= sregs
->gdt
.limit
;
7125 dt
.address
= sregs
->gdt
.base
;
7126 kvm_x86_ops
->set_gdt(vcpu
, &dt
);
7128 vcpu
->arch
.cr2
= sregs
->cr2
;
7129 mmu_reset_needed
|= kvm_read_cr3(vcpu
) != sregs
->cr3
;
7130 vcpu
->arch
.cr3
= sregs
->cr3
;
7131 __set_bit(VCPU_EXREG_CR3
, (ulong
*)&vcpu
->arch
.regs_avail
);
7133 kvm_set_cr8(vcpu
, sregs
->cr8
);
7135 mmu_reset_needed
|= vcpu
->arch
.efer
!= sregs
->efer
;
7136 kvm_x86_ops
->set_efer(vcpu
, sregs
->efer
);
7137 apic_base_msr
.data
= sregs
->apic_base
;
7138 apic_base_msr
.host_initiated
= true;
7139 kvm_set_apic_base(vcpu
, &apic_base_msr
);
7141 mmu_reset_needed
|= kvm_read_cr0(vcpu
) != sregs
->cr0
;
7142 kvm_x86_ops
->set_cr0(vcpu
, sregs
->cr0
);
7143 vcpu
->arch
.cr0
= sregs
->cr0
;
7145 mmu_reset_needed
|= kvm_read_cr4(vcpu
) != sregs
->cr4
;
7146 kvm_x86_ops
->set_cr4(vcpu
, sregs
->cr4
);
7147 if (sregs
->cr4
& (X86_CR4_OSXSAVE
| X86_CR4_PKE
))
7148 kvm_update_cpuid(vcpu
);
7150 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7151 if (!is_long_mode(vcpu
) && is_pae(vcpu
)) {
7152 load_pdptrs(vcpu
, vcpu
->arch
.walk_mmu
, kvm_read_cr3(vcpu
));
7153 mmu_reset_needed
= 1;
7155 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
7157 if (mmu_reset_needed
)
7158 kvm_mmu_reset_context(vcpu
);
7160 max_bits
= KVM_NR_INTERRUPTS
;
7161 pending_vec
= find_first_bit(
7162 (const unsigned long *)sregs
->interrupt_bitmap
, max_bits
);
7163 if (pending_vec
< max_bits
) {
7164 kvm_queue_interrupt(vcpu
, pending_vec
, false);
7165 pr_debug("Set back pending irq %d\n", pending_vec
);
7168 kvm_set_segment(vcpu
, &sregs
->cs
, VCPU_SREG_CS
);
7169 kvm_set_segment(vcpu
, &sregs
->ds
, VCPU_SREG_DS
);
7170 kvm_set_segment(vcpu
, &sregs
->es
, VCPU_SREG_ES
);
7171 kvm_set_segment(vcpu
, &sregs
->fs
, VCPU_SREG_FS
);
7172 kvm_set_segment(vcpu
, &sregs
->gs
, VCPU_SREG_GS
);
7173 kvm_set_segment(vcpu
, &sregs
->ss
, VCPU_SREG_SS
);
7175 kvm_set_segment(vcpu
, &sregs
->tr
, VCPU_SREG_TR
);
7176 kvm_set_segment(vcpu
, &sregs
->ldt
, VCPU_SREG_LDTR
);
7178 update_cr8_intercept(vcpu
);
7180 /* Older userspace won't unhalt the vcpu on reset. */
7181 if (kvm_vcpu_is_bsp(vcpu
) && kvm_rip_read(vcpu
) == 0xfff0 &&
7182 sregs
->cs
.selector
== 0xf000 && sregs
->cs
.base
== 0xffff0000 &&
7184 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
7186 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7191 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu
*vcpu
,
7192 struct kvm_guest_debug
*dbg
)
7194 unsigned long rflags
;
7197 if (dbg
->control
& (KVM_GUESTDBG_INJECT_DB
| KVM_GUESTDBG_INJECT_BP
)) {
7199 if (vcpu
->arch
.exception
.pending
)
7201 if (dbg
->control
& KVM_GUESTDBG_INJECT_DB
)
7202 kvm_queue_exception(vcpu
, DB_VECTOR
);
7204 kvm_queue_exception(vcpu
, BP_VECTOR
);
7208 * Read rflags as long as potentially injected trace flags are still
7211 rflags
= kvm_get_rflags(vcpu
);
7213 vcpu
->guest_debug
= dbg
->control
;
7214 if (!(vcpu
->guest_debug
& KVM_GUESTDBG_ENABLE
))
7215 vcpu
->guest_debug
= 0;
7217 if (vcpu
->guest_debug
& KVM_GUESTDBG_USE_HW_BP
) {
7218 for (i
= 0; i
< KVM_NR_DB_REGS
; ++i
)
7219 vcpu
->arch
.eff_db
[i
] = dbg
->arch
.debugreg
[i
];
7220 vcpu
->arch
.guest_debug_dr7
= dbg
->arch
.debugreg
[7];
7222 for (i
= 0; i
< KVM_NR_DB_REGS
; i
++)
7223 vcpu
->arch
.eff_db
[i
] = vcpu
->arch
.db
[i
];
7225 kvm_update_dr7(vcpu
);
7227 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
)
7228 vcpu
->arch
.singlestep_rip
= kvm_rip_read(vcpu
) +
7229 get_segment_base(vcpu
, VCPU_SREG_CS
);
7232 * Trigger an rflags update that will inject or remove the trace
7235 kvm_set_rflags(vcpu
, rflags
);
7237 kvm_x86_ops
->update_bp_intercept(vcpu
);
7247 * Translate a guest virtual address to a guest physical address.
7249 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu
*vcpu
,
7250 struct kvm_translation
*tr
)
7252 unsigned long vaddr
= tr
->linear_address
;
7256 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7257 gpa
= kvm_mmu_gva_to_gpa_system(vcpu
, vaddr
, NULL
);
7258 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
7259 tr
->physical_address
= gpa
;
7260 tr
->valid
= gpa
!= UNMAPPED_GVA
;
7267 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu
*vcpu
, struct kvm_fpu
*fpu
)
7269 struct fxregs_state
*fxsave
=
7270 &vcpu
->arch
.guest_fpu
.state
.fxsave
;
7272 memcpy(fpu
->fpr
, fxsave
->st_space
, 128);
7273 fpu
->fcw
= fxsave
->cwd
;
7274 fpu
->fsw
= fxsave
->swd
;
7275 fpu
->ftwx
= fxsave
->twd
;
7276 fpu
->last_opcode
= fxsave
->fop
;
7277 fpu
->last_ip
= fxsave
->rip
;
7278 fpu
->last_dp
= fxsave
->rdp
;
7279 memcpy(fpu
->xmm
, fxsave
->xmm_space
, sizeof fxsave
->xmm_space
);
7284 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu
*vcpu
, struct kvm_fpu
*fpu
)
7286 struct fxregs_state
*fxsave
=
7287 &vcpu
->arch
.guest_fpu
.state
.fxsave
;
7289 memcpy(fxsave
->st_space
, fpu
->fpr
, 128);
7290 fxsave
->cwd
= fpu
->fcw
;
7291 fxsave
->swd
= fpu
->fsw
;
7292 fxsave
->twd
= fpu
->ftwx
;
7293 fxsave
->fop
= fpu
->last_opcode
;
7294 fxsave
->rip
= fpu
->last_ip
;
7295 fxsave
->rdp
= fpu
->last_dp
;
7296 memcpy(fxsave
->xmm_space
, fpu
->xmm
, sizeof fxsave
->xmm_space
);
7301 static void fx_init(struct kvm_vcpu
*vcpu
)
7303 fpstate_init(&vcpu
->arch
.guest_fpu
.state
);
7304 if (boot_cpu_has(X86_FEATURE_XSAVES
))
7305 vcpu
->arch
.guest_fpu
.state
.xsave
.header
.xcomp_bv
=
7306 host_xcr0
| XSTATE_COMPACTION_ENABLED
;
7309 * Ensure guest xcr0 is valid for loading
7311 vcpu
->arch
.xcr0
= XFEATURE_MASK_FP
;
7313 vcpu
->arch
.cr0
|= X86_CR0_ET
;
7316 void kvm_load_guest_fpu(struct kvm_vcpu
*vcpu
)
7318 if (vcpu
->guest_fpu_loaded
)
7322 * Restore all possible states in the guest,
7323 * and assume host would use all available bits.
7324 * Guest xcr0 would be loaded later.
7326 vcpu
->guest_fpu_loaded
= 1;
7327 __kernel_fpu_begin();
7328 __copy_kernel_to_fpregs(&vcpu
->arch
.guest_fpu
.state
);
7332 void kvm_put_guest_fpu(struct kvm_vcpu
*vcpu
)
7334 if (!vcpu
->guest_fpu_loaded
) {
7335 vcpu
->fpu_counter
= 0;
7339 vcpu
->guest_fpu_loaded
= 0;
7340 copy_fpregs_to_fpstate(&vcpu
->arch
.guest_fpu
);
7342 ++vcpu
->stat
.fpu_reload
;
7344 * If using eager FPU mode, or if the guest is a frequent user
7345 * of the FPU, just leave the FPU active for next time.
7346 * Every 255 times fpu_counter rolls over to 0; a guest that uses
7347 * the FPU in bursts will revert to loading it on demand.
7349 if (!use_eager_fpu()) {
7350 if (++vcpu
->fpu_counter
< 5)
7351 kvm_make_request(KVM_REQ_DEACTIVATE_FPU
, vcpu
);
7356 void kvm_arch_vcpu_free(struct kvm_vcpu
*vcpu
)
7358 kvmclock_reset(vcpu
);
7360 free_cpumask_var(vcpu
->arch
.wbinvd_dirty_mask
);
7361 kvm_x86_ops
->vcpu_free(vcpu
);
7364 struct kvm_vcpu
*kvm_arch_vcpu_create(struct kvm
*kvm
,
7367 struct kvm_vcpu
*vcpu
;
7369 if (check_tsc_unstable() && atomic_read(&kvm
->online_vcpus
) != 0)
7370 printk_once(KERN_WARNING
7371 "kvm: SMP vm created on host with unstable TSC; "
7372 "guest TSC will not be reliable\n");
7374 vcpu
= kvm_x86_ops
->vcpu_create(kvm
, id
);
7379 int kvm_arch_vcpu_setup(struct kvm_vcpu
*vcpu
)
7383 kvm_vcpu_mtrr_init(vcpu
);
7384 r
= vcpu_load(vcpu
);
7387 kvm_vcpu_reset(vcpu
, false);
7388 kvm_mmu_setup(vcpu
);
7393 void kvm_arch_vcpu_postcreate(struct kvm_vcpu
*vcpu
)
7395 struct msr_data msr
;
7396 struct kvm
*kvm
= vcpu
->kvm
;
7398 if (vcpu_load(vcpu
))
7401 msr
.index
= MSR_IA32_TSC
;
7402 msr
.host_initiated
= true;
7403 kvm_write_tsc(vcpu
, &msr
);
7406 if (!kvmclock_periodic_sync
)
7409 schedule_delayed_work(&kvm
->arch
.kvmclock_sync_work
,
7410 KVMCLOCK_SYNC_PERIOD
);
7413 void kvm_arch_vcpu_destroy(struct kvm_vcpu
*vcpu
)
7416 vcpu
->arch
.apf
.msr_val
= 0;
7418 r
= vcpu_load(vcpu
);
7420 kvm_mmu_unload(vcpu
);
7423 kvm_x86_ops
->vcpu_free(vcpu
);
7426 void kvm_vcpu_reset(struct kvm_vcpu
*vcpu
, bool init_event
)
7428 vcpu
->arch
.hflags
= 0;
7430 atomic_set(&vcpu
->arch
.nmi_queued
, 0);
7431 vcpu
->arch
.nmi_pending
= 0;
7432 vcpu
->arch
.nmi_injected
= false;
7433 kvm_clear_interrupt_queue(vcpu
);
7434 kvm_clear_exception_queue(vcpu
);
7436 memset(vcpu
->arch
.db
, 0, sizeof(vcpu
->arch
.db
));
7437 kvm_update_dr0123(vcpu
);
7438 vcpu
->arch
.dr6
= DR6_INIT
;
7439 kvm_update_dr6(vcpu
);
7440 vcpu
->arch
.dr7
= DR7_FIXED_1
;
7441 kvm_update_dr7(vcpu
);
7445 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
7446 vcpu
->arch
.apf
.msr_val
= 0;
7447 vcpu
->arch
.st
.msr_val
= 0;
7449 kvmclock_reset(vcpu
);
7451 kvm_clear_async_pf_completion_queue(vcpu
);
7452 kvm_async_pf_hash_reset(vcpu
);
7453 vcpu
->arch
.apf
.halted
= false;
7456 kvm_pmu_reset(vcpu
);
7457 vcpu
->arch
.smbase
= 0x30000;
7460 memset(vcpu
->arch
.regs
, 0, sizeof(vcpu
->arch
.regs
));
7461 vcpu
->arch
.regs_avail
= ~0;
7462 vcpu
->arch
.regs_dirty
= ~0;
7464 kvm_x86_ops
->vcpu_reset(vcpu
, init_event
);
7467 void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu
*vcpu
, u8 vector
)
7469 struct kvm_segment cs
;
7471 kvm_get_segment(vcpu
, &cs
, VCPU_SREG_CS
);
7472 cs
.selector
= vector
<< 8;
7473 cs
.base
= vector
<< 12;
7474 kvm_set_segment(vcpu
, &cs
, VCPU_SREG_CS
);
7475 kvm_rip_write(vcpu
, 0);
7478 int kvm_arch_hardware_enable(void)
7481 struct kvm_vcpu
*vcpu
;
7486 bool stable
, backwards_tsc
= false;
7488 kvm_shared_msr_cpu_online();
7489 ret
= kvm_x86_ops
->hardware_enable();
7493 local_tsc
= rdtsc();
7494 stable
= !check_tsc_unstable();
7495 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
7496 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
7497 if (!stable
&& vcpu
->cpu
== smp_processor_id())
7498 kvm_make_request(KVM_REQ_CLOCK_UPDATE
, vcpu
);
7499 if (stable
&& vcpu
->arch
.last_host_tsc
> local_tsc
) {
7500 backwards_tsc
= true;
7501 if (vcpu
->arch
.last_host_tsc
> max_tsc
)
7502 max_tsc
= vcpu
->arch
.last_host_tsc
;
7508 * Sometimes, even reliable TSCs go backwards. This happens on
7509 * platforms that reset TSC during suspend or hibernate actions, but
7510 * maintain synchronization. We must compensate. Fortunately, we can
7511 * detect that condition here, which happens early in CPU bringup,
7512 * before any KVM threads can be running. Unfortunately, we can't
7513 * bring the TSCs fully up to date with real time, as we aren't yet far
7514 * enough into CPU bringup that we know how much real time has actually
7515 * elapsed; our helper function, get_kernel_ns() will be using boot
7516 * variables that haven't been updated yet.
7518 * So we simply find the maximum observed TSC above, then record the
7519 * adjustment to TSC in each VCPU. When the VCPU later gets loaded,
7520 * the adjustment will be applied. Note that we accumulate
7521 * adjustments, in case multiple suspend cycles happen before some VCPU
7522 * gets a chance to run again. In the event that no KVM threads get a
7523 * chance to run, we will miss the entire elapsed period, as we'll have
7524 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
7525 * loose cycle time. This isn't too big a deal, since the loss will be
7526 * uniform across all VCPUs (not to mention the scenario is extremely
7527 * unlikely). It is possible that a second hibernate recovery happens
7528 * much faster than a first, causing the observed TSC here to be
7529 * smaller; this would require additional padding adjustment, which is
7530 * why we set last_host_tsc to the local tsc observed here.
7532 * N.B. - this code below runs only on platforms with reliable TSC,
7533 * as that is the only way backwards_tsc is set above. Also note
7534 * that this runs for ALL vcpus, which is not a bug; all VCPUs should
7535 * have the same delta_cyc adjustment applied if backwards_tsc
7536 * is detected. Note further, this adjustment is only done once,
7537 * as we reset last_host_tsc on all VCPUs to stop this from being
7538 * called multiple times (one for each physical CPU bringup).
7540 * Platforms with unreliable TSCs don't have to deal with this, they
7541 * will be compensated by the logic in vcpu_load, which sets the TSC to
7542 * catchup mode. This will catchup all VCPUs to real time, but cannot
7543 * guarantee that they stay in perfect synchronization.
7545 if (backwards_tsc
) {
7546 u64 delta_cyc
= max_tsc
- local_tsc
;
7547 backwards_tsc_observed
= true;
7548 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
7549 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
7550 vcpu
->arch
.tsc_offset_adjustment
+= delta_cyc
;
7551 vcpu
->arch
.last_host_tsc
= local_tsc
;
7552 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE
, vcpu
);
7556 * We have to disable TSC offset matching.. if you were
7557 * booting a VM while issuing an S4 host suspend....
7558 * you may have some problem. Solving this issue is
7559 * left as an exercise to the reader.
7561 kvm
->arch
.last_tsc_nsec
= 0;
7562 kvm
->arch
.last_tsc_write
= 0;
7569 void kvm_arch_hardware_disable(void)
7571 kvm_x86_ops
->hardware_disable();
7572 drop_user_return_notifiers();
7575 int kvm_arch_hardware_setup(void)
7579 r
= kvm_x86_ops
->hardware_setup();
7583 if (kvm_has_tsc_control
) {
7585 * Make sure the user can only configure tsc_khz values that
7586 * fit into a signed integer.
7587 * A min value is not calculated needed because it will always
7588 * be 1 on all machines.
7590 u64 max
= min(0x7fffffffULL
,
7591 __scale_tsc(kvm_max_tsc_scaling_ratio
, tsc_khz
));
7592 kvm_max_guest_tsc_khz
= max
;
7594 kvm_default_tsc_scaling_ratio
= 1ULL << kvm_tsc_scaling_ratio_frac_bits
;
7597 kvm_init_msr_list();
7601 void kvm_arch_hardware_unsetup(void)
7603 kvm_x86_ops
->hardware_unsetup();
7606 void kvm_arch_check_processor_compat(void *rtn
)
7608 kvm_x86_ops
->check_processor_compatibility(rtn
);
7611 bool kvm_vcpu_is_reset_bsp(struct kvm_vcpu
*vcpu
)
7613 return vcpu
->kvm
->arch
.bsp_vcpu_id
== vcpu
->vcpu_id
;
7615 EXPORT_SYMBOL_GPL(kvm_vcpu_is_reset_bsp
);
7617 bool kvm_vcpu_is_bsp(struct kvm_vcpu
*vcpu
)
7619 return (vcpu
->arch
.apic_base
& MSR_IA32_APICBASE_BSP
) != 0;
7622 bool kvm_vcpu_compatible(struct kvm_vcpu
*vcpu
)
7624 return irqchip_in_kernel(vcpu
->kvm
) == lapic_in_kernel(vcpu
);
7627 struct static_key kvm_no_apic_vcpu __read_mostly
;
7628 EXPORT_SYMBOL_GPL(kvm_no_apic_vcpu
);
7630 int kvm_arch_vcpu_init(struct kvm_vcpu
*vcpu
)
7636 BUG_ON(vcpu
->kvm
== NULL
);
7639 vcpu
->arch
.apicv_active
= kvm_x86_ops
->get_enable_apicv();
7640 vcpu
->arch
.pv
.pv_unhalted
= false;
7641 vcpu
->arch
.emulate_ctxt
.ops
= &emulate_ops
;
7642 if (!irqchip_in_kernel(kvm
) || kvm_vcpu_is_reset_bsp(vcpu
))
7643 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
7645 vcpu
->arch
.mp_state
= KVM_MP_STATE_UNINITIALIZED
;
7647 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
7652 vcpu
->arch
.pio_data
= page_address(page
);
7654 kvm_set_tsc_khz(vcpu
, max_tsc_khz
);
7656 r
= kvm_mmu_create(vcpu
);
7658 goto fail_free_pio_data
;
7660 if (irqchip_in_kernel(kvm
)) {
7661 r
= kvm_create_lapic(vcpu
);
7663 goto fail_mmu_destroy
;
7665 static_key_slow_inc(&kvm_no_apic_vcpu
);
7667 vcpu
->arch
.mce_banks
= kzalloc(KVM_MAX_MCE_BANKS
* sizeof(u64
) * 4,
7669 if (!vcpu
->arch
.mce_banks
) {
7671 goto fail_free_lapic
;
7673 vcpu
->arch
.mcg_cap
= KVM_MAX_MCE_BANKS
;
7675 if (!zalloc_cpumask_var(&vcpu
->arch
.wbinvd_dirty_mask
, GFP_KERNEL
)) {
7677 goto fail_free_mce_banks
;
7682 vcpu
->arch
.ia32_tsc_adjust_msr
= 0x0;
7683 vcpu
->arch
.pv_time_enabled
= false;
7685 vcpu
->arch
.guest_supported_xcr0
= 0;
7686 vcpu
->arch
.guest_xstate_size
= XSAVE_HDR_SIZE
+ XSAVE_HDR_OFFSET
;
7688 vcpu
->arch
.maxphyaddr
= cpuid_query_maxphyaddr(vcpu
);
7690 vcpu
->arch
.pat
= MSR_IA32_CR_PAT_DEFAULT
;
7692 kvm_async_pf_hash_reset(vcpu
);
7695 vcpu
->arch
.pending_external_vector
= -1;
7697 kvm_hv_vcpu_init(vcpu
);
7701 fail_free_mce_banks
:
7702 kfree(vcpu
->arch
.mce_banks
);
7704 kvm_free_lapic(vcpu
);
7706 kvm_mmu_destroy(vcpu
);
7708 free_page((unsigned long)vcpu
->arch
.pio_data
);
7713 void kvm_arch_vcpu_uninit(struct kvm_vcpu
*vcpu
)
7717 kvm_hv_vcpu_uninit(vcpu
);
7718 kvm_pmu_destroy(vcpu
);
7719 kfree(vcpu
->arch
.mce_banks
);
7720 kvm_free_lapic(vcpu
);
7721 idx
= srcu_read_lock(&vcpu
->kvm
->srcu
);
7722 kvm_mmu_destroy(vcpu
);
7723 srcu_read_unlock(&vcpu
->kvm
->srcu
, idx
);
7724 free_page((unsigned long)vcpu
->arch
.pio_data
);
7725 if (!lapic_in_kernel(vcpu
))
7726 static_key_slow_dec(&kvm_no_apic_vcpu
);
7729 void kvm_arch_sched_in(struct kvm_vcpu
*vcpu
, int cpu
)
7731 kvm_x86_ops
->sched_in(vcpu
, cpu
);
7734 int kvm_arch_init_vm(struct kvm
*kvm
, unsigned long type
)
7739 INIT_HLIST_HEAD(&kvm
->arch
.mask_notifier_list
);
7740 INIT_LIST_HEAD(&kvm
->arch
.active_mmu_pages
);
7741 INIT_LIST_HEAD(&kvm
->arch
.zapped_obsolete_pages
);
7742 INIT_LIST_HEAD(&kvm
->arch
.assigned_dev_head
);
7743 atomic_set(&kvm
->arch
.noncoherent_dma_count
, 0);
7745 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
7746 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID
, &kvm
->arch
.irq_sources_bitmap
);
7747 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
7748 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID
,
7749 &kvm
->arch
.irq_sources_bitmap
);
7751 raw_spin_lock_init(&kvm
->arch
.tsc_write_lock
);
7752 mutex_init(&kvm
->arch
.apic_map_lock
);
7753 spin_lock_init(&kvm
->arch
.pvclock_gtod_sync_lock
);
7755 pvclock_update_vm_gtod_copy(kvm
);
7757 INIT_DELAYED_WORK(&kvm
->arch
.kvmclock_update_work
, kvmclock_update_fn
);
7758 INIT_DELAYED_WORK(&kvm
->arch
.kvmclock_sync_work
, kvmclock_sync_fn
);
7760 kvm_page_track_init(kvm
);
7761 kvm_mmu_init_vm(kvm
);
7763 if (kvm_x86_ops
->vm_init
)
7764 return kvm_x86_ops
->vm_init(kvm
);
7769 static void kvm_unload_vcpu_mmu(struct kvm_vcpu
*vcpu
)
7772 r
= vcpu_load(vcpu
);
7774 kvm_mmu_unload(vcpu
);
7778 static void kvm_free_vcpus(struct kvm
*kvm
)
7781 struct kvm_vcpu
*vcpu
;
7784 * Unpin any mmu pages first.
7786 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
7787 kvm_clear_async_pf_completion_queue(vcpu
);
7788 kvm_unload_vcpu_mmu(vcpu
);
7790 kvm_for_each_vcpu(i
, vcpu
, kvm
)
7791 kvm_arch_vcpu_free(vcpu
);
7793 mutex_lock(&kvm
->lock
);
7794 for (i
= 0; i
< atomic_read(&kvm
->online_vcpus
); i
++)
7795 kvm
->vcpus
[i
] = NULL
;
7797 atomic_set(&kvm
->online_vcpus
, 0);
7798 mutex_unlock(&kvm
->lock
);
7801 void kvm_arch_sync_events(struct kvm
*kvm
)
7803 cancel_delayed_work_sync(&kvm
->arch
.kvmclock_sync_work
);
7804 cancel_delayed_work_sync(&kvm
->arch
.kvmclock_update_work
);
7805 kvm_free_all_assigned_devices(kvm
);
7809 int __x86_set_memory_region(struct kvm
*kvm
, int id
, gpa_t gpa
, u32 size
)
7813 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
7814 struct kvm_memory_slot
*slot
, old
;
7816 /* Called with kvm->slots_lock held. */
7817 if (WARN_ON(id
>= KVM_MEM_SLOTS_NUM
))
7820 slot
= id_to_memslot(slots
, id
);
7826 * MAP_SHARED to prevent internal slot pages from being moved
7829 hva
= vm_mmap(NULL
, 0, size
, PROT_READ
| PROT_WRITE
,
7830 MAP_SHARED
| MAP_ANONYMOUS
, 0);
7831 if (IS_ERR((void *)hva
))
7832 return PTR_ERR((void *)hva
);
7841 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
7842 struct kvm_userspace_memory_region m
;
7844 m
.slot
= id
| (i
<< 16);
7846 m
.guest_phys_addr
= gpa
;
7847 m
.userspace_addr
= hva
;
7848 m
.memory_size
= size
;
7849 r
= __kvm_set_memory_region(kvm
, &m
);
7855 r
= vm_munmap(old
.userspace_addr
, old
.npages
* PAGE_SIZE
);
7861 EXPORT_SYMBOL_GPL(__x86_set_memory_region
);
7863 int x86_set_memory_region(struct kvm
*kvm
, int id
, gpa_t gpa
, u32 size
)
7867 mutex_lock(&kvm
->slots_lock
);
7868 r
= __x86_set_memory_region(kvm
, id
, gpa
, size
);
7869 mutex_unlock(&kvm
->slots_lock
);
7873 EXPORT_SYMBOL_GPL(x86_set_memory_region
);
7875 void kvm_arch_destroy_vm(struct kvm
*kvm
)
7877 if (current
->mm
== kvm
->mm
) {
7879 * Free memory regions allocated on behalf of userspace,
7880 * unless the the memory map has changed due to process exit
7883 x86_set_memory_region(kvm
, APIC_ACCESS_PAGE_PRIVATE_MEMSLOT
, 0, 0);
7884 x86_set_memory_region(kvm
, IDENTITY_PAGETABLE_PRIVATE_MEMSLOT
, 0, 0);
7885 x86_set_memory_region(kvm
, TSS_PRIVATE_MEMSLOT
, 0, 0);
7887 if (kvm_x86_ops
->vm_destroy
)
7888 kvm_x86_ops
->vm_destroy(kvm
);
7889 kvm_iommu_unmap_guest(kvm
);
7890 kfree(kvm
->arch
.vpic
);
7891 kfree(kvm
->arch
.vioapic
);
7892 kvm_free_vcpus(kvm
);
7893 kfree(rcu_dereference_check(kvm
->arch
.apic_map
, 1));
7894 kvm_mmu_uninit_vm(kvm
);
7897 void kvm_arch_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
7898 struct kvm_memory_slot
*dont
)
7902 for (i
= 0; i
< KVM_NR_PAGE_SIZES
; ++i
) {
7903 if (!dont
|| free
->arch
.rmap
[i
] != dont
->arch
.rmap
[i
]) {
7904 kvfree(free
->arch
.rmap
[i
]);
7905 free
->arch
.rmap
[i
] = NULL
;
7910 if (!dont
|| free
->arch
.lpage_info
[i
- 1] !=
7911 dont
->arch
.lpage_info
[i
- 1]) {
7912 kvfree(free
->arch
.lpage_info
[i
- 1]);
7913 free
->arch
.lpage_info
[i
- 1] = NULL
;
7917 kvm_page_track_free_memslot(free
, dont
);
7920 int kvm_arch_create_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*slot
,
7921 unsigned long npages
)
7925 for (i
= 0; i
< KVM_NR_PAGE_SIZES
; ++i
) {
7926 struct kvm_lpage_info
*linfo
;
7931 lpages
= gfn_to_index(slot
->base_gfn
+ npages
- 1,
7932 slot
->base_gfn
, level
) + 1;
7934 slot
->arch
.rmap
[i
] =
7935 kvm_kvzalloc(lpages
* sizeof(*slot
->arch
.rmap
[i
]));
7936 if (!slot
->arch
.rmap
[i
])
7941 linfo
= kvm_kvzalloc(lpages
* sizeof(*linfo
));
7945 slot
->arch
.lpage_info
[i
- 1] = linfo
;
7947 if (slot
->base_gfn
& (KVM_PAGES_PER_HPAGE(level
) - 1))
7948 linfo
[0].disallow_lpage
= 1;
7949 if ((slot
->base_gfn
+ npages
) & (KVM_PAGES_PER_HPAGE(level
) - 1))
7950 linfo
[lpages
- 1].disallow_lpage
= 1;
7951 ugfn
= slot
->userspace_addr
>> PAGE_SHIFT
;
7953 * If the gfn and userspace address are not aligned wrt each
7954 * other, or if explicitly asked to, disable large page
7955 * support for this slot
7957 if ((slot
->base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
7958 !kvm_largepages_enabled()) {
7961 for (j
= 0; j
< lpages
; ++j
)
7962 linfo
[j
].disallow_lpage
= 1;
7966 if (kvm_page_track_create_memslot(slot
, npages
))
7972 for (i
= 0; i
< KVM_NR_PAGE_SIZES
; ++i
) {
7973 kvfree(slot
->arch
.rmap
[i
]);
7974 slot
->arch
.rmap
[i
] = NULL
;
7978 kvfree(slot
->arch
.lpage_info
[i
- 1]);
7979 slot
->arch
.lpage_info
[i
- 1] = NULL
;
7984 void kvm_arch_memslots_updated(struct kvm
*kvm
, struct kvm_memslots
*slots
)
7987 * memslots->generation has been incremented.
7988 * mmio generation may have reached its maximum value.
7990 kvm_mmu_invalidate_mmio_sptes(kvm
, slots
);
7993 int kvm_arch_prepare_memory_region(struct kvm
*kvm
,
7994 struct kvm_memory_slot
*memslot
,
7995 const struct kvm_userspace_memory_region
*mem
,
7996 enum kvm_mr_change change
)
8001 static void kvm_mmu_slot_apply_flags(struct kvm
*kvm
,
8002 struct kvm_memory_slot
*new)
8004 /* Still write protect RO slot */
8005 if (new->flags
& KVM_MEM_READONLY
) {
8006 kvm_mmu_slot_remove_write_access(kvm
, new);
8011 * Call kvm_x86_ops dirty logging hooks when they are valid.
8013 * kvm_x86_ops->slot_disable_log_dirty is called when:
8015 * - KVM_MR_CREATE with dirty logging is disabled
8016 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag
8018 * The reason is, in case of PML, we need to set D-bit for any slots
8019 * with dirty logging disabled in order to eliminate unnecessary GPA
8020 * logging in PML buffer (and potential PML buffer full VMEXT). This
8021 * guarantees leaving PML enabled during guest's lifetime won't have
8022 * any additonal overhead from PML when guest is running with dirty
8023 * logging disabled for memory slots.
8025 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot
8026 * to dirty logging mode.
8028 * If kvm_x86_ops dirty logging hooks are invalid, use write protect.
8030 * In case of write protect:
8032 * Write protect all pages for dirty logging.
8034 * All the sptes including the large sptes which point to this
8035 * slot are set to readonly. We can not create any new large
8036 * spte on this slot until the end of the logging.
8038 * See the comments in fast_page_fault().
8040 if (new->flags
& KVM_MEM_LOG_DIRTY_PAGES
) {
8041 if (kvm_x86_ops
->slot_enable_log_dirty
)
8042 kvm_x86_ops
->slot_enable_log_dirty(kvm
, new);
8044 kvm_mmu_slot_remove_write_access(kvm
, new);
8046 if (kvm_x86_ops
->slot_disable_log_dirty
)
8047 kvm_x86_ops
->slot_disable_log_dirty(kvm
, new);
8051 void kvm_arch_commit_memory_region(struct kvm
*kvm
,
8052 const struct kvm_userspace_memory_region
*mem
,
8053 const struct kvm_memory_slot
*old
,
8054 const struct kvm_memory_slot
*new,
8055 enum kvm_mr_change change
)
8057 int nr_mmu_pages
= 0;
8059 if (!kvm
->arch
.n_requested_mmu_pages
)
8060 nr_mmu_pages
= kvm_mmu_calculate_mmu_pages(kvm
);
8063 kvm_mmu_change_mmu_pages(kvm
, nr_mmu_pages
);
8066 * Dirty logging tracks sptes in 4k granularity, meaning that large
8067 * sptes have to be split. If live migration is successful, the guest
8068 * in the source machine will be destroyed and large sptes will be
8069 * created in the destination. However, if the guest continues to run
8070 * in the source machine (for example if live migration fails), small
8071 * sptes will remain around and cause bad performance.
8073 * Scan sptes if dirty logging has been stopped, dropping those
8074 * which can be collapsed into a single large-page spte. Later
8075 * page faults will create the large-page sptes.
8077 if ((change
!= KVM_MR_DELETE
) &&
8078 (old
->flags
& KVM_MEM_LOG_DIRTY_PAGES
) &&
8079 !(new->flags
& KVM_MEM_LOG_DIRTY_PAGES
))
8080 kvm_mmu_zap_collapsible_sptes(kvm
, new);
8083 * Set up write protection and/or dirty logging for the new slot.
8085 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have
8086 * been zapped so no dirty logging staff is needed for old slot. For
8087 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the
8088 * new and it's also covered when dealing with the new slot.
8090 * FIXME: const-ify all uses of struct kvm_memory_slot.
8092 if (change
!= KVM_MR_DELETE
)
8093 kvm_mmu_slot_apply_flags(kvm
, (struct kvm_memory_slot
*) new);
8096 void kvm_arch_flush_shadow_all(struct kvm
*kvm
)
8098 kvm_mmu_invalidate_zap_all_pages(kvm
);
8101 void kvm_arch_flush_shadow_memslot(struct kvm
*kvm
,
8102 struct kvm_memory_slot
*slot
)
8104 kvm_mmu_invalidate_zap_all_pages(kvm
);
8107 static inline bool kvm_vcpu_has_events(struct kvm_vcpu
*vcpu
)
8109 if (!list_empty_careful(&vcpu
->async_pf
.done
))
8112 if (kvm_apic_has_events(vcpu
))
8115 if (vcpu
->arch
.pv
.pv_unhalted
)
8118 if (atomic_read(&vcpu
->arch
.nmi_queued
))
8121 if (test_bit(KVM_REQ_SMI
, &vcpu
->requests
))
8124 if (kvm_arch_interrupt_allowed(vcpu
) &&
8125 kvm_cpu_has_interrupt(vcpu
))
8128 if (kvm_hv_has_stimer_pending(vcpu
))
8134 int kvm_arch_vcpu_runnable(struct kvm_vcpu
*vcpu
)
8136 if (is_guest_mode(vcpu
) && kvm_x86_ops
->check_nested_events
)
8137 kvm_x86_ops
->check_nested_events(vcpu
, false);
8139 return kvm_vcpu_running(vcpu
) || kvm_vcpu_has_events(vcpu
);
8142 int kvm_arch_vcpu_should_kick(struct kvm_vcpu
*vcpu
)
8144 return kvm_vcpu_exiting_guest_mode(vcpu
) == IN_GUEST_MODE
;
8147 int kvm_arch_interrupt_allowed(struct kvm_vcpu
*vcpu
)
8149 return kvm_x86_ops
->interrupt_allowed(vcpu
);
8152 unsigned long kvm_get_linear_rip(struct kvm_vcpu
*vcpu
)
8154 if (is_64_bit_mode(vcpu
))
8155 return kvm_rip_read(vcpu
);
8156 return (u32
)(get_segment_base(vcpu
, VCPU_SREG_CS
) +
8157 kvm_rip_read(vcpu
));
8159 EXPORT_SYMBOL_GPL(kvm_get_linear_rip
);
8161 bool kvm_is_linear_rip(struct kvm_vcpu
*vcpu
, unsigned long linear_rip
)
8163 return kvm_get_linear_rip(vcpu
) == linear_rip
;
8165 EXPORT_SYMBOL_GPL(kvm_is_linear_rip
);
8167 unsigned long kvm_get_rflags(struct kvm_vcpu
*vcpu
)
8169 unsigned long rflags
;
8171 rflags
= kvm_x86_ops
->get_rflags(vcpu
);
8172 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
)
8173 rflags
&= ~X86_EFLAGS_TF
;
8176 EXPORT_SYMBOL_GPL(kvm_get_rflags
);
8178 static void __kvm_set_rflags(struct kvm_vcpu
*vcpu
, unsigned long rflags
)
8180 if (vcpu
->guest_debug
& KVM_GUESTDBG_SINGLESTEP
&&
8181 kvm_is_linear_rip(vcpu
, vcpu
->arch
.singlestep_rip
))
8182 rflags
|= X86_EFLAGS_TF
;
8183 kvm_x86_ops
->set_rflags(vcpu
, rflags
);
8186 void kvm_set_rflags(struct kvm_vcpu
*vcpu
, unsigned long rflags
)
8188 __kvm_set_rflags(vcpu
, rflags
);
8189 kvm_make_request(KVM_REQ_EVENT
, vcpu
);
8191 EXPORT_SYMBOL_GPL(kvm_set_rflags
);
8193 void kvm_arch_async_page_ready(struct kvm_vcpu
*vcpu
, struct kvm_async_pf
*work
)
8197 if ((vcpu
->arch
.mmu
.direct_map
!= work
->arch
.direct_map
) ||
8201 r
= kvm_mmu_reload(vcpu
);
8205 if (!vcpu
->arch
.mmu
.direct_map
&&
8206 work
->arch
.cr3
!= vcpu
->arch
.mmu
.get_cr3(vcpu
))
8209 vcpu
->arch
.mmu
.page_fault(vcpu
, work
->gva
, 0, true);
8212 static inline u32
kvm_async_pf_hash_fn(gfn_t gfn
)
8214 return hash_32(gfn
& 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU
));
8217 static inline u32
kvm_async_pf_next_probe(u32 key
)
8219 return (key
+ 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU
) - 1);
8222 static void kvm_add_async_pf_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8224 u32 key
= kvm_async_pf_hash_fn(gfn
);
8226 while (vcpu
->arch
.apf
.gfns
[key
] != ~0)
8227 key
= kvm_async_pf_next_probe(key
);
8229 vcpu
->arch
.apf
.gfns
[key
] = gfn
;
8232 static u32
kvm_async_pf_gfn_slot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8235 u32 key
= kvm_async_pf_hash_fn(gfn
);
8237 for (i
= 0; i
< roundup_pow_of_two(ASYNC_PF_PER_VCPU
) &&
8238 (vcpu
->arch
.apf
.gfns
[key
] != gfn
&&
8239 vcpu
->arch
.apf
.gfns
[key
] != ~0); i
++)
8240 key
= kvm_async_pf_next_probe(key
);
8245 bool kvm_find_async_pf_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8247 return vcpu
->arch
.apf
.gfns
[kvm_async_pf_gfn_slot(vcpu
, gfn
)] == gfn
;
8250 static void kvm_del_async_pf_gfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
8254 i
= j
= kvm_async_pf_gfn_slot(vcpu
, gfn
);
8256 vcpu
->arch
.apf
.gfns
[i
] = ~0;
8258 j
= kvm_async_pf_next_probe(j
);
8259 if (vcpu
->arch
.apf
.gfns
[j
] == ~0)
8261 k
= kvm_async_pf_hash_fn(vcpu
->arch
.apf
.gfns
[j
]);
8263 * k lies cyclically in ]i,j]
8265 * |....j i.k.| or |.k..j i...|
8267 } while ((i
<= j
) ? (i
< k
&& k
<= j
) : (i
< k
|| k
<= j
));
8268 vcpu
->arch
.apf
.gfns
[i
] = vcpu
->arch
.apf
.gfns
[j
];
8273 static int apf_put_user(struct kvm_vcpu
*vcpu
, u32 val
)
8276 return kvm_write_guest_cached(vcpu
->kvm
, &vcpu
->arch
.apf
.data
, &val
,
8280 void kvm_arch_async_page_not_present(struct kvm_vcpu
*vcpu
,
8281 struct kvm_async_pf
*work
)
8283 struct x86_exception fault
;
8285 trace_kvm_async_pf_not_present(work
->arch
.token
, work
->gva
);
8286 kvm_add_async_pf_gfn(vcpu
, work
->arch
.gfn
);
8288 if (!(vcpu
->arch
.apf
.msr_val
& KVM_ASYNC_PF_ENABLED
) ||
8289 (vcpu
->arch
.apf
.send_user_only
&&
8290 kvm_x86_ops
->get_cpl(vcpu
) == 0))
8291 kvm_make_request(KVM_REQ_APF_HALT
, vcpu
);
8292 else if (!apf_put_user(vcpu
, KVM_PV_REASON_PAGE_NOT_PRESENT
)) {
8293 fault
.vector
= PF_VECTOR
;
8294 fault
.error_code_valid
= true;
8295 fault
.error_code
= 0;
8296 fault
.nested_page_fault
= false;
8297 fault
.address
= work
->arch
.token
;
8298 kvm_inject_page_fault(vcpu
, &fault
);
8302 void kvm_arch_async_page_present(struct kvm_vcpu
*vcpu
,
8303 struct kvm_async_pf
*work
)
8305 struct x86_exception fault
;
8307 trace_kvm_async_pf_ready(work
->arch
.token
, work
->gva
);
8308 if (work
->wakeup_all
)
8309 work
->arch
.token
= ~0; /* broadcast wakeup */
8311 kvm_del_async_pf_gfn(vcpu
, work
->arch
.gfn
);
8313 if ((vcpu
->arch
.apf
.msr_val
& KVM_ASYNC_PF_ENABLED
) &&
8314 !apf_put_user(vcpu
, KVM_PV_REASON_PAGE_READY
)) {
8315 fault
.vector
= PF_VECTOR
;
8316 fault
.error_code_valid
= true;
8317 fault
.error_code
= 0;
8318 fault
.nested_page_fault
= false;
8319 fault
.address
= work
->arch
.token
;
8320 kvm_inject_page_fault(vcpu
, &fault
);
8322 vcpu
->arch
.apf
.halted
= false;
8323 vcpu
->arch
.mp_state
= KVM_MP_STATE_RUNNABLE
;
8326 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu
*vcpu
)
8328 if (!(vcpu
->arch
.apf
.msr_val
& KVM_ASYNC_PF_ENABLED
))
8331 return !kvm_event_needs_reinjection(vcpu
) &&
8332 kvm_x86_ops
->interrupt_allowed(vcpu
);
8335 void kvm_arch_start_assignment(struct kvm
*kvm
)
8337 atomic_inc(&kvm
->arch
.assigned_device_count
);
8339 EXPORT_SYMBOL_GPL(kvm_arch_start_assignment
);
8341 void kvm_arch_end_assignment(struct kvm
*kvm
)
8343 atomic_dec(&kvm
->arch
.assigned_device_count
);
8345 EXPORT_SYMBOL_GPL(kvm_arch_end_assignment
);
8347 bool kvm_arch_has_assigned_device(struct kvm
*kvm
)
8349 return atomic_read(&kvm
->arch
.assigned_device_count
);
8351 EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device
);
8353 void kvm_arch_register_noncoherent_dma(struct kvm
*kvm
)
8355 atomic_inc(&kvm
->arch
.noncoherent_dma_count
);
8357 EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma
);
8359 void kvm_arch_unregister_noncoherent_dma(struct kvm
*kvm
)
8361 atomic_dec(&kvm
->arch
.noncoherent_dma_count
);
8363 EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma
);
8365 bool kvm_arch_has_noncoherent_dma(struct kvm
*kvm
)
8367 return atomic_read(&kvm
->arch
.noncoherent_dma_count
);
8369 EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma
);
8371 bool kvm_arch_has_irq_bypass(void)
8373 return kvm_x86_ops
->update_pi_irte
!= NULL
;
8376 int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer
*cons
,
8377 struct irq_bypass_producer
*prod
)
8379 struct kvm_kernel_irqfd
*irqfd
=
8380 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
8382 irqfd
->producer
= prod
;
8384 return kvm_x86_ops
->update_pi_irte(irqfd
->kvm
,
8385 prod
->irq
, irqfd
->gsi
, 1);
8388 void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer
*cons
,
8389 struct irq_bypass_producer
*prod
)
8392 struct kvm_kernel_irqfd
*irqfd
=
8393 container_of(cons
, struct kvm_kernel_irqfd
, consumer
);
8395 WARN_ON(irqfd
->producer
!= prod
);
8396 irqfd
->producer
= NULL
;
8399 * When producer of consumer is unregistered, we change back to
8400 * remapped mode, so we can re-use the current implementation
8401 * when the irq is masked/disabed or the consumer side (KVM
8402 * int this case doesn't want to receive the interrupts.
8404 ret
= kvm_x86_ops
->update_pi_irte(irqfd
->kvm
, prod
->irq
, irqfd
->gsi
, 0);
8406 printk(KERN_INFO
"irq bypass consumer (token %p) unregistration"
8407 " fails: %d\n", irqfd
->consumer
.token
, ret
);
8410 int kvm_arch_update_irqfd_routing(struct kvm
*kvm
, unsigned int host_irq
,
8411 uint32_t guest_irq
, bool set
)
8413 if (!kvm_x86_ops
->update_pi_irte
)
8416 return kvm_x86_ops
->update_pi_irte(kvm
, host_irq
, guest_irq
, set
);
8419 bool kvm_vector_hashing_enabled(void)
8421 return vector_hashing
;
8423 EXPORT_SYMBOL_GPL(kvm_vector_hashing_enabled
);
8425 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit
);
8426 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_fast_mmio
);
8427 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq
);
8428 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault
);
8429 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr
);
8430 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr
);
8431 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun
);
8432 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit
);
8433 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject
);
8434 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit
);
8435 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga
);
8436 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit
);
8437 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts
);
8438 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset
);
8439 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window
);
8440 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full
);
8441 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pi_irte_update
);
8442 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_unaccelerated_access
);
8443 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_avic_incomplete_ipi
);