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KVM: nVMX: Do not emulate #UD while in guest mode
[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kvm / x86.c
CommitLineData
043405e1
CO		 1/*
2 * Kernel-based Virtual Machine driver for Linux
3 *
4 * derived from drivers/kvm/kvm_main.c
5 *
6 * Copyright (C) 2006 Qumranet, Inc.
4d5c5d0f
BAY		 7 * Copyright (C) 2008 Qumranet, Inc.
8 * Copyright IBM Corporation, 2008
9611c187 9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
043405e1
CO		 10 *
11 * Authors:
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
4d5c5d0f
BAY		 14 * Amit Shah <amit.shah@qumranet.com>
15 * Ben-Ami Yassour <benami@il.ibm.com>
043405e1
CO		 16 *
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
19 *
20 */
21
edf88417 22#include <linux/kvm_host.h>
313a3dc7 23#include "irq.h"
1d737c8a 24#include "mmu.h"
7837699f 25#include "i8254.h"
37817f29 26#include "tss.h"
5fdbf976 27#include "kvm_cache_regs.h"
26eef70c 28#include "x86.h"
00b27a3e 29#include "cpuid.h"
c9eab58f 30#include "assigned-dev.h"
313a3dc7 31
18068523 32#include <linux/clocksource.h>
4d5c5d0f 33#include <linux/interrupt.h>
313a3dc7
CO		 34#include <linux/kvm.h>
35#include <linux/fs.h>
36#include <linux/vmalloc.h>
5fb76f9b 37#include <linux/module.h>
0de10343 38#include <linux/mman.h>
2bacc55c 39#include <linux/highmem.h>
19de40a8 40#include <linux/iommu.h>
62c476c7 41#include <linux/intel-iommu.h>
c8076604 42#include <linux/cpufreq.h>
18863bdd 43#include <linux/user-return-notifier.h>
a983fb23 44#include <linux/srcu.h>
5a0e3ad6 45#include <linux/slab.h>
ff9d07a0 46#include <linux/perf_event.h>
7bee342a 47#include <linux/uaccess.h>
af585b92 48#include <linux/hash.h>
a1b60c1c 49#include <linux/pci.h>
16e8d74d
MT		 50#include <linux/timekeeper_internal.h>
51#include <linux/pvclock_gtod.h>
aec51dc4 52#include <trace/events/kvm.h>
2ed152af 53
229456fc
MT		 54#define CREATE_TRACE_POINTS
55#include "trace.h"
043405e1 56
24f1e32c 57#include <asm/debugreg.h>
d825ed0a 58#include <asm/msr.h>
a5f61300 59#include <asm/desc.h>
0bed3b56 60#include <asm/mtrr.h>
890ca9ae 61#include <asm/mce.h>
7cf30855 62#include <asm/i387.h>
1361b83a 63#include <asm/fpu-internal.h> /* Ugh! */
98918833 64#include <asm/xcr.h>
1d5f066e 65#include <asm/pvclock.h>
217fc9cf 66#include <asm/div64.h>
043405e1 67
313a3dc7 68#define MAX_IO_MSRS 256
890ca9ae 69#define KVM_MAX_MCE_BANKS 32
5854dbca 70#define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
890ca9ae 71
0f65dd70
AK		 72#define emul_to_vcpu(ctxt) \
73 container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
74
50a37eb4
JR		 75/* EFER defaults:
76 * - enable syscall per default because its emulated by KVM
77 * - enable LME and LMA per default on 64 bit KVM
78 */
79#ifdef CONFIG_X86_64
1260edbe
LJ		 80static
81u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
50a37eb4 82#else
1260edbe 83static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
50a37eb4 84#endif
313a3dc7 85
ba1389b7
AK		 86#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
87#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
417bc304 88
cb142eb7 89static void update_cr8_intercept(struct kvm_vcpu *vcpu);
7460fb4a 90static void process_nmi(struct kvm_vcpu *vcpu);
6addfc42 91static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
674eea0f 92
97896d04 93struct kvm_x86_ops *kvm_x86_ops;
5fdbf976 94EXPORT_SYMBOL_GPL(kvm_x86_ops);
97896d04 95
476bc001
RR		 96static bool ignore_msrs = 0;
97module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
ed85c068 98
9ed96e87
MT		 99unsigned int min_timer_period_us = 500;
100module_param(min_timer_period_us, uint, S_IRUGO | S_IWUSR);
101
92a1f12d
JR		 102bool kvm_has_tsc_control;
103EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
104u32 kvm_max_guest_tsc_khz;
105EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
106
cc578287
ZA		 107/* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
108static u32 tsc_tolerance_ppm = 250;
109module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
110
d0659d94
MT		 111/* lapic timer advance (tscdeadline mode only) in nanoseconds */
112unsigned int lapic_timer_advance_ns = 0;
113module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR);
114
16a96021
MT		 115static bool backwards_tsc_observed = false;
116
18863bdd
AK		 117#define KVM_NR_SHARED_MSRS 16
118
119struct kvm_shared_msrs_global {
120 int nr;
2bf78fa7 121 u32 msrs[KVM_NR_SHARED_MSRS];
18863bdd
AK		 122};
123
124struct kvm_shared_msrs {
125 struct user_return_notifier urn;
126 bool registered;
2bf78fa7
SY		 127 struct kvm_shared_msr_values {
128 u64 host;
129 u64 curr;
130 } values[KVM_NR_SHARED_MSRS];
18863bdd
AK		 131};
132
133static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
013f6a5d 134static struct kvm_shared_msrs __percpu *shared_msrs;
18863bdd 135
417bc304 136struct kvm_stats_debugfs_item debugfs_entries[] = {
ba1389b7
AK		 137 { "pf_fixed", VCPU_STAT(pf_fixed) },
138 { "pf_guest", VCPU_STAT(pf_guest) },
139 { "tlb_flush", VCPU_STAT(tlb_flush) },
140 { "invlpg", VCPU_STAT(invlpg) },
141 { "exits", VCPU_STAT(exits) },
142 { "io_exits", VCPU_STAT(io_exits) },
143 { "mmio_exits", VCPU_STAT(mmio_exits) },
144 { "signal_exits", VCPU_STAT(signal_exits) },
145 { "irq_window", VCPU_STAT(irq_window_exits) },
f08864b4 146 { "nmi_window", VCPU_STAT(nmi_window_exits) },
ba1389b7 147 { "halt_exits", VCPU_STAT(halt_exits) },
f7819512 148 { "halt_successful_poll", VCPU_STAT(halt_successful_poll) },
ba1389b7 149 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
f11c3a8d 150 { "hypercalls", VCPU_STAT(hypercalls) },
ba1389b7
AK		 151 { "request_irq", VCPU_STAT(request_irq_exits) },
152 { "irq_exits", VCPU_STAT(irq_exits) },
153 { "host_state_reload", VCPU_STAT(host_state_reload) },
154 { "efer_reload", VCPU_STAT(efer_reload) },
155 { "fpu_reload", VCPU_STAT(fpu_reload) },
156 { "insn_emulation", VCPU_STAT(insn_emulation) },
157 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
fa89a817 158 { "irq_injections", VCPU_STAT(irq_injections) },
c4abb7c9 159 { "nmi_injections", VCPU_STAT(nmi_injections) },
4cee5764
AK		 160 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
161 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
162 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
163 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
164 { "mmu_flooded", VM_STAT(mmu_flooded) },
165 { "mmu_recycled", VM_STAT(mmu_recycled) },
dfc5aa00 166 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
4731d4c7 167 { "mmu_unsync", VM_STAT(mmu_unsync) },
0f74a24c 168 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
05da4558 169 { "largepages", VM_STAT(lpages) },
417bc304
HB		 170 { NULL }
171};
172
2acf923e
DC		 173u64 __read_mostly host_xcr0;
174
b6785def 175static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
d6aa1000 176
af585b92
GN		 177static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
178{
179 int i;
180 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
181 vcpu->arch.apf.gfns[i] = ~0;
182}
183
18863bdd
AK		 184static void kvm_on_user_return(struct user_return_notifier *urn)
185{
186 unsigned slot;
18863bdd
AK		 187 struct kvm_shared_msrs *locals
188 = container_of(urn, struct kvm_shared_msrs, urn);
2bf78fa7 189 struct kvm_shared_msr_values *values;
18863bdd
AK		 190
191 for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
2bf78fa7
SY		 192 values = &locals->values[slot];
193 if (values->host != values->curr) {
194 wrmsrl(shared_msrs_global.msrs[slot], values->host);
195 values->curr = values->host;
18863bdd
AK		 196 }
197 }
198 locals->registered = false;
199 user_return_notifier_unregister(urn);
200}
201
2bf78fa7 202static void shared_msr_update(unsigned slot, u32 msr)
18863bdd 203{
18863bdd 204 u64 value;
013f6a5d
MT		 205 unsigned int cpu = smp_processor_id();
206 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
18863bdd 207
2bf78fa7
SY		 208 /* only read, and nobody should modify it at this time,
209 * so don't need lock */
210 if (slot >= shared_msrs_global.nr) {
211 printk(KERN_ERR "kvm: invalid MSR slot!");
212 return;
213 }
214 rdmsrl_safe(msr, &value);
215 smsr->values[slot].host = value;
216 smsr->values[slot].curr = value;
217}
218
219void kvm_define_shared_msr(unsigned slot, u32 msr)
220{
0123be42 221 BUG_ON(slot >= KVM_NR_SHARED_MSRS);
18863bdd
AK		 222 if (slot >= shared_msrs_global.nr)
223 shared_msrs_global.nr = slot + 1;
2bf78fa7
SY		 224 shared_msrs_global.msrs[slot] = msr;
225 /* we need ensured the shared_msr_global have been updated */
226 smp_wmb();
18863bdd
AK		 227}
228EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
229
230static void kvm_shared_msr_cpu_online(void)
231{
232 unsigned i;
18863bdd
AK		 233
234 for (i = 0; i < shared_msrs_global.nr; ++i)
2bf78fa7 235 shared_msr_update(i, shared_msrs_global.msrs[i]);
18863bdd
AK		 236}
237
8b3c3104 238int kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
18863bdd 239{
013f6a5d
MT		 240 unsigned int cpu = smp_processor_id();
241 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
8b3c3104 242 int err;
18863bdd 243
2bf78fa7 244 if (((value ^ smsr->values[slot].curr) & mask) == 0)
8b3c3104 245 return 0;
2bf78fa7 246 smsr->values[slot].curr = value;
8b3c3104
AH		 247 err = wrmsrl_safe(shared_msrs_global.msrs[slot], value);
248 if (err)
249 return 1;
250
18863bdd
AK		 251 if (!smsr->registered) {
252 smsr->urn.on_user_return = kvm_on_user_return;
253 user_return_notifier_register(&smsr->urn);
254 smsr->registered = true;
255 }
8b3c3104 256 return 0;
18863bdd
AK		 257}
258EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
259
13a34e06 260static void drop_user_return_notifiers(void)
3548bab5 261{
013f6a5d
MT		 262 unsigned int cpu = smp_processor_id();
263 struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
3548bab5
AK		 264
265 if (smsr->registered)
266 kvm_on_user_return(&smsr->urn);
267}
268
6866b83e
CO		 269u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
270{
8a5a87d9 271 return vcpu->arch.apic_base;
6866b83e
CO		 272}
273EXPORT_SYMBOL_GPL(kvm_get_apic_base);
274
58cb628d
JK		 275int kvm_set_apic_base(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
276{
277 u64 old_state = vcpu->arch.apic_base &
278 (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE);
279 u64 new_state = msr_info->data &
280 (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE);
281 u64 reserved_bits = ((~0ULL) << cpuid_maxphyaddr(vcpu)) |
282 0x2ff | (guest_cpuid_has_x2apic(vcpu) ? 0 : X2APIC_ENABLE);
283
284 if (!msr_info->host_initiated &&
285 ((msr_info->data & reserved_bits) != 0 ||
286 new_state == X2APIC_ENABLE ||
287 (new_state == MSR_IA32_APICBASE_ENABLE &&
288 old_state == (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE)) ||
289 (new_state == (MSR_IA32_APICBASE_ENABLE | X2APIC_ENABLE) &&
290 old_state == 0)))
291 return 1;
292
293 kvm_lapic_set_base(vcpu, msr_info->data);
294 return 0;
6866b83e
CO		 295}
296EXPORT_SYMBOL_GPL(kvm_set_apic_base);
297
2605fc21 298asmlinkage __visible void kvm_spurious_fault(void)
e3ba45b8
GL		 299{
300 /* Fault while not rebooting. We want the trace. */
301 BUG();
302}
303EXPORT_SYMBOL_GPL(kvm_spurious_fault);
304
3fd28fce
ED		 305#define EXCPT_BENIGN 0
306#define EXCPT_CONTRIBUTORY 1
307#define EXCPT_PF 2
308
309static int exception_class(int vector)
310{
311 switch (vector) {
312 case PF_VECTOR:
313 return EXCPT_PF;
314 case DE_VECTOR:
315 case TS_VECTOR:
316 case NP_VECTOR:
317 case SS_VECTOR:
318 case GP_VECTOR:
319 return EXCPT_CONTRIBUTORY;
320 default:
321 break;
322 }
323 return EXCPT_BENIGN;
324}
325
d6e8c854
NA		 326#define EXCPT_FAULT 0
327#define EXCPT_TRAP 1
328#define EXCPT_ABORT 2
329#define EXCPT_INTERRUPT 3
330
331static int exception_type(int vector)
332{
333 unsigned int mask;
334
335 if (WARN_ON(vector > 31 || vector == NMI_VECTOR))
336 return EXCPT_INTERRUPT;
337
338 mask = 1 << vector;
339
340 /* #DB is trap, as instruction watchpoints are handled elsewhere */
341 if (mask & ((1 << DB_VECTOR) | (1 << BP_VECTOR) | (1 << OF_VECTOR)))
342 return EXCPT_TRAP;
343
344 if (mask & ((1 << DF_VECTOR) | (1 << MC_VECTOR)))
345 return EXCPT_ABORT;
346
347 /* Reserved exceptions will result in fault */
348 return EXCPT_FAULT;
349}
350
3fd28fce 351static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
ce7ddec4
JR		 352 unsigned nr, bool has_error, u32 error_code,
353 bool reinject)
3fd28fce
ED		 354{
355 u32 prev_nr;
356 int class1, class2;
357
3842d135
AK		 358 kvm_make_request(KVM_REQ_EVENT, vcpu);
359
3fd28fce
ED		 360 if (!vcpu->arch.exception.pending) {
361 queue:
3ffb2468
NA		 362 if (has_error && !is_protmode(vcpu))
363 has_error = false;
3fd28fce
ED		 364 vcpu->arch.exception.pending = true;
365 vcpu->arch.exception.has_error_code = has_error;
366 vcpu->arch.exception.nr = nr;
367 vcpu->arch.exception.error_code = error_code;
3f0fd292 368 vcpu->arch.exception.reinject = reinject;
3fd28fce
ED		 369 return;
370 }
371
372 /* to check exception */
373 prev_nr = vcpu->arch.exception.nr;
374 if (prev_nr == DF_VECTOR) {
375 /* triple fault -> shutdown */
a8eeb04a 376 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
3fd28fce
ED		 377 return;
378 }
379 class1 = exception_class(prev_nr);
380 class2 = exception_class(nr);
381 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
382 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
383 /* generate double fault per SDM Table 5-5 */
384 vcpu->arch.exception.pending = true;
385 vcpu->arch.exception.has_error_code = true;
386 vcpu->arch.exception.nr = DF_VECTOR;
387 vcpu->arch.exception.error_code = 0;
388 } else
389 /* replace previous exception with a new one in a hope
390 that instruction re-execution will regenerate lost
391 exception */
392 goto queue;
393}
394
298101da
AK		 395void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
396{
ce7ddec4 397 kvm_multiple_exception(vcpu, nr, false, 0, false);
298101da
AK		 398}
399EXPORT_SYMBOL_GPL(kvm_queue_exception);
400
ce7ddec4
JR		 401void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
402{
403 kvm_multiple_exception(vcpu, nr, false, 0, true);
404}
405EXPORT_SYMBOL_GPL(kvm_requeue_exception);
406
db8fcefa 407void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
c3c91fee 408{
db8fcefa
AP		 409 if (err)
410 kvm_inject_gp(vcpu, 0);
411 else
412 kvm_x86_ops->skip_emulated_instruction(vcpu);
413}
414EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
8df25a32 415
6389ee94 416void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
c3c91fee
AK		 417{
418 ++vcpu->stat.pf_guest;
6389ee94
AK		 419 vcpu->arch.cr2 = fault->address;
420 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
c3c91fee 421}
27d6c865 422EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
c3c91fee 423
ef54bcfe 424static bool kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
d4f8cf66 425{
6389ee94
AK		 426 if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
427 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
d4f8cf66 428 else
6389ee94 429 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
ef54bcfe
PB		 430
431 return fault->nested_page_fault;
d4f8cf66
JR		 432}
433
3419ffc8
SY		 434void kvm_inject_nmi(struct kvm_vcpu *vcpu)
435{
7460fb4a
AK		 436 atomic_inc(&vcpu->arch.nmi_queued);
437 kvm_make_request(KVM_REQ_NMI, vcpu);
3419ffc8
SY		 438}
439EXPORT_SYMBOL_GPL(kvm_inject_nmi);
440
298101da
AK		 441void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
442{
ce7ddec4 443 kvm_multiple_exception(vcpu, nr, true, error_code, false);
298101da
AK		 444}
445EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
446
ce7ddec4
JR		 447void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
448{
449 kvm_multiple_exception(vcpu, nr, true, error_code, true);
450}
451EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
452
0a79b009
AK		 453/*
454 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
455 * a #GP and return false.
456 */
457bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
298101da 458{
0a79b009
AK		 459 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
460 return true;
461 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
462 return false;
298101da 463}
0a79b009 464EXPORT_SYMBOL_GPL(kvm_require_cpl);
298101da 465
16f8a6f9
NA		 466bool kvm_require_dr(struct kvm_vcpu *vcpu, int dr)
467{
468 if ((dr != 4 && dr != 5) || !kvm_read_cr4_bits(vcpu, X86_CR4_DE))
469 return true;
470
471 kvm_queue_exception(vcpu, UD_VECTOR);
472 return false;
473}
474EXPORT_SYMBOL_GPL(kvm_require_dr);
475
ec92fe44
JR		 476/*
477 * This function will be used to read from the physical memory of the currently
478 * running guest. The difference to kvm_read_guest_page is that this function
479 * can read from guest physical or from the guest's guest physical memory.
480 */
481int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
482 gfn_t ngfn, void *data, int offset, int len,
483 u32 access)
484{
54987b7a 485 struct x86_exception exception;
ec92fe44
JR		 486 gfn_t real_gfn;
487 gpa_t ngpa;
488
489 ngpa = gfn_to_gpa(ngfn);
54987b7a 490 real_gfn = mmu->translate_gpa(vcpu, ngpa, access, &exception);
ec92fe44
JR		 491 if (real_gfn == UNMAPPED_GVA)
492 return -EFAULT;
493
494 real_gfn = gpa_to_gfn(real_gfn);
495
496 return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
497}
498EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
499
69b0049a 500static int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
3d06b8bf
JR		 501 void *data, int offset, int len, u32 access)
502{
503 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
504 data, offset, len, access);
505}
506
a03490ed
CO		 507/*
508 * Load the pae pdptrs. Return true is they are all valid.
509 */
ff03a073 510int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
a03490ed
CO		 511{
512 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
513 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
514 int i;
515 int ret;
ff03a073 516 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
a03490ed 517
ff03a073
JR		 518 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
519 offset * sizeof(u64), sizeof(pdpte),
520 PFERR_USER_MASK|PFERR_WRITE_MASK);
a03490ed
CO		 521 if (ret < 0) {
522 ret = 0;
523 goto out;
524 }
525 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
43a3795a 526 if (is_present_gpte(pdpte[i]) &&
20c466b5 527 (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
a03490ed
CO		 528 ret = 0;
529 goto out;
530 }
531 }
532 ret = 1;
533
ff03a073 534 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
6de4f3ad
AK		 535 __set_bit(VCPU_EXREG_PDPTR,
536 (unsigned long *)&vcpu->arch.regs_avail);
537 __set_bit(VCPU_EXREG_PDPTR,
538 (unsigned long *)&vcpu->arch.regs_dirty);
a03490ed 539out:
a03490ed
CO		 540
541 return ret;
542}
cc4b6871 543EXPORT_SYMBOL_GPL(load_pdptrs);
a03490ed 544
d835dfec
AK		 545static bool pdptrs_changed(struct kvm_vcpu *vcpu)
546{
ff03a073 547 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
d835dfec 548 bool changed = true;
3d06b8bf
JR		 549 int offset;
550 gfn_t gfn;
d835dfec
AK		 551 int r;
552
553 if (is_long_mode(vcpu) || !is_pae(vcpu))
554 return false;
555
6de4f3ad
AK		 556 if (!test_bit(VCPU_EXREG_PDPTR,
557 (unsigned long *)&vcpu->arch.regs_avail))
558 return true;
559
9f8fe504
AK		 560 gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
561 offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
3d06b8bf
JR		 562 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
563 PFERR_USER_MASK | PFERR_WRITE_MASK);
d835dfec
AK		 564 if (r < 0)
565 goto out;
ff03a073 566 changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
d835dfec 567out:
d835dfec
AK		 568
569 return changed;
570}
571
49a9b07e 572int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
a03490ed 573{
aad82703
SY		 574 unsigned long old_cr0 = kvm_read_cr0(vcpu);
575 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
576 X86_CR0_CD | X86_CR0_NW;
577
f9a48e6a
AK		 578 cr0 |= X86_CR0_ET;
579
ab344828 580#ifdef CONFIG_X86_64
0f12244f
GN		 581 if (cr0 & 0xffffffff00000000UL)
582 return 1;
ab344828
GN		 583#endif
584
585 cr0 &= ~CR0_RESERVED_BITS;
a03490ed 586
0f12244f
GN		 587 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
588 return 1;
a03490ed 589
0f12244f
GN		 590 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
591 return 1;
a03490ed
CO		 592
593 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
594#ifdef CONFIG_X86_64
f6801dff 595 if ((vcpu->arch.efer & EFER_LME)) {
a03490ed
CO		 596 int cs_db, cs_l;
597
0f12244f
GN		 598 if (!is_pae(vcpu))
599 return 1;
a03490ed 600 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
0f12244f
GN		 601 if (cs_l)
602 return 1;
a03490ed
CO		 603 } else
604#endif
ff03a073 605 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
9f8fe504 606 kvm_read_cr3(vcpu)))
0f12244f 607 return 1;
a03490ed
CO		 608 }
609
ad756a16
MJ		 610 if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
611 return 1;
612
a03490ed 613 kvm_x86_ops->set_cr0(vcpu, cr0);
a03490ed 614
d170c419 615 if ((cr0 ^ old_cr0) & X86_CR0_PG) {
e5f3f027 616 kvm_clear_async_pf_completion_queue(vcpu);
d170c419
LJ		 617 kvm_async_pf_hash_reset(vcpu);
618 }
e5f3f027 619
aad82703
SY		 620 if ((cr0 ^ old_cr0) & update_bits)
621 kvm_mmu_reset_context(vcpu);
0f12244f
GN		 622 return 0;
623}
2d3ad1f4 624EXPORT_SYMBOL_GPL(kvm_set_cr0);
a03490ed 625
2d3ad1f4 626void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
a03490ed 627{
49a9b07e 628 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
a03490ed 629}
2d3ad1f4 630EXPORT_SYMBOL_GPL(kvm_lmsw);
a03490ed 631
42bdf991
MT		 632static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
633{
634 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
635 !vcpu->guest_xcr0_loaded) {
636 /* kvm_set_xcr() also depends on this */
637 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
638 vcpu->guest_xcr0_loaded = 1;
639 }
640}
641
642static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
643{
644 if (vcpu->guest_xcr0_loaded) {
645 if (vcpu->arch.xcr0 != host_xcr0)
646 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
647 vcpu->guest_xcr0_loaded = 0;
648 }
649}
650
69b0049a 651static int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
2acf923e 652{
56c103ec
LJ		 653 u64 xcr0 = xcr;
654 u64 old_xcr0 = vcpu->arch.xcr0;
46c34cb0 655 u64 valid_bits;
2acf923e
DC		 656
657 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
658 if (index != XCR_XFEATURE_ENABLED_MASK)
659 return 1;
2acf923e
DC		 660 if (!(xcr0 & XSTATE_FP))
661 return 1;
662 if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
663 return 1;
46c34cb0
PB		 664
665 /*
666 * Do not allow the guest to set bits that we do not support
667 * saving. However, xcr0 bit 0 is always set, even if the
668 * emulated CPU does not support XSAVE (see fx_init).
669 */
670 valid_bits = vcpu->arch.guest_supported_xcr0 | XSTATE_FP;
671 if (xcr0 & ~valid_bits)
2acf923e 672 return 1;
46c34cb0 673
390bd528
LJ		 674 if ((!(xcr0 & XSTATE_BNDREGS)) != (!(xcr0 & XSTATE_BNDCSR)))
675 return 1;
676
612263b3
CP		 677 if (xcr0 & XSTATE_AVX512) {
678 if (!(xcr0 & XSTATE_YMM))
679 return 1;
680 if ((xcr0 & XSTATE_AVX512) != XSTATE_AVX512)
681 return 1;
682 }
42bdf991 683 kvm_put_guest_xcr0(vcpu);
2acf923e 684 vcpu->arch.xcr0 = xcr0;
56c103ec
LJ		 685
686 if ((xcr0 ^ old_xcr0) & XSTATE_EXTEND_MASK)
687 kvm_update_cpuid(vcpu);
2acf923e
DC		 688 return 0;
689}
690
691int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
692{
764bcbc5
Z		 693 if (kvm_x86_ops->get_cpl(vcpu) != 0 ||
694 __kvm_set_xcr(vcpu, index, xcr)) {
2acf923e
DC		 695 kvm_inject_gp(vcpu, 0);
696 return 1;
697 }
698 return 0;
699}
700EXPORT_SYMBOL_GPL(kvm_set_xcr);
701
a83b29c6 702int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
a03490ed 703{
fc78f519 704 unsigned long old_cr4 = kvm_read_cr4(vcpu);
c68b734f
YW		 705 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE |
706 X86_CR4_PAE | X86_CR4_SMEP;
0f12244f
GN		 707 if (cr4 & CR4_RESERVED_BITS)
708 return 1;
a03490ed 709
2acf923e
DC		 710 if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
711 return 1;
712
c68b734f
YW		 713 if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP))
714 return 1;
715
97ec8c06
FW		 716 if (!guest_cpuid_has_smap(vcpu) && (cr4 & X86_CR4_SMAP))
717 return 1;
718
afcbf13f 719 if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_FSGSBASE))
74dc2b4f
YW		 720 return 1;
721
a03490ed 722 if (is_long_mode(vcpu)) {
0f12244f
GN		 723 if (!(cr4 & X86_CR4_PAE))
724 return 1;
a2edf57f
AK		 725 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
726 && ((cr4 ^ old_cr4) & pdptr_bits)
9f8fe504
AK		 727 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
728 kvm_read_cr3(vcpu)))
0f12244f
GN		 729 return 1;
730
ad756a16
MJ		 731 if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
732 if (!guest_cpuid_has_pcid(vcpu))
733 return 1;
734
735 /* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
736 if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
737 return 1;
738 }
739
5e1746d6 740 if (kvm_x86_ops->set_cr4(vcpu, cr4))
0f12244f 741 return 1;
a03490ed 742
ad756a16
MJ		 743 if (((cr4 ^ old_cr4) & pdptr_bits) ||
744 (!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
aad82703 745 kvm_mmu_reset_context(vcpu);
0f12244f 746
97ec8c06
FW		 747 if ((cr4 ^ old_cr4) & X86_CR4_SMAP)
748 update_permission_bitmask(vcpu, vcpu->arch.walk_mmu, false);
749
2acf923e 750 if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
00b27a3e 751 kvm_update_cpuid(vcpu);
2acf923e 752
0f12244f
GN		 753 return 0;
754}
2d3ad1f4 755EXPORT_SYMBOL_GPL(kvm_set_cr4);
a03490ed 756
2390218b 757int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
a03490ed 758{
ac146235 759#ifdef CONFIG_X86_64
9d88fca7 760 cr3 &= ~CR3_PCID_INVD;
ac146235 761#endif
9d88fca7 762
9f8fe504 763 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
0ba73cda 764 kvm_mmu_sync_roots(vcpu);
77c3913b 765 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
0f12244f 766 return 0;
d835dfec
AK		 767 }
768
a03490ed 769 if (is_long_mode(vcpu)) {
d9f89b88
JK		 770 if (cr3 & CR3_L_MODE_RESERVED_BITS)
771 return 1;
772 } else if (is_pae(vcpu) && is_paging(vcpu) &&
773 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
346874c9 774 return 1;
a03490ed 775
0f12244f 776 vcpu->arch.cr3 = cr3;
aff48baa 777 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
d8d173da 778 kvm_mmu_new_cr3(vcpu);
0f12244f
GN		 779 return 0;
780}
2d3ad1f4 781EXPORT_SYMBOL_GPL(kvm_set_cr3);
a03490ed 782
eea1cff9 783int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
a03490ed 784{
0f12244f
GN		 785 if (cr8 & CR8_RESERVED_BITS)
786 return 1;
a03490ed
CO		 787 if (irqchip_in_kernel(vcpu->kvm))
788 kvm_lapic_set_tpr(vcpu, cr8);
789 else
ad312c7c 790 vcpu->arch.cr8 = cr8;
0f12244f
GN		 791 return 0;
792}
2d3ad1f4 793EXPORT_SYMBOL_GPL(kvm_set_cr8);
a03490ed 794
2d3ad1f4 795unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
a03490ed
CO		 796{
797 if (irqchip_in_kernel(vcpu->kvm))
798 return kvm_lapic_get_cr8(vcpu);
799 else
ad312c7c 800 return vcpu->arch.cr8;
a03490ed 801}
2d3ad1f4 802EXPORT_SYMBOL_GPL(kvm_get_cr8);
a03490ed 803
73aaf249
JK		 804static void kvm_update_dr6(struct kvm_vcpu *vcpu)
805{
806 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
807 kvm_x86_ops->set_dr6(vcpu, vcpu->arch.dr6);
808}
809
c8639010
JK		 810static void kvm_update_dr7(struct kvm_vcpu *vcpu)
811{
812 unsigned long dr7;
813
814 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
815 dr7 = vcpu->arch.guest_debug_dr7;
816 else
817 dr7 = vcpu->arch.dr7;
818 kvm_x86_ops->set_dr7(vcpu, dr7);
360b948d
PB		 819 vcpu->arch.switch_db_regs &= ~KVM_DEBUGREG_BP_ENABLED;
820 if (dr7 & DR7_BP_EN_MASK)
821 vcpu->arch.switch_db_regs |= KVM_DEBUGREG_BP_ENABLED;
c8639010
JK		 822}
823
6f43ed01
NA		 824static u64 kvm_dr6_fixed(struct kvm_vcpu *vcpu)
825{
826 u64 fixed = DR6_FIXED_1;
827
828 if (!guest_cpuid_has_rtm(vcpu))
829 fixed |= DR6_RTM;
830 return fixed;
831}
832
338dbc97 833static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
020df079
GN		 834{
835 switch (dr) {
836 case 0 ... 3:
837 vcpu->arch.db[dr] = val;
838 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
839 vcpu->arch.eff_db[dr] = val;
840 break;
841 case 4:
020df079
GN		 842 /* fall through */
843 case 6:
338dbc97
GN		 844 if (val & 0xffffffff00000000ULL)
845 return -1; /* #GP */
6f43ed01 846 vcpu->arch.dr6 = (val & DR6_VOLATILE) | kvm_dr6_fixed(vcpu);
73aaf249 847 kvm_update_dr6(vcpu);
020df079
GN		 848 break;
849 case 5:
020df079
GN		 850 /* fall through */
851 default: /* 7 */
338dbc97
GN		 852 if (val & 0xffffffff00000000ULL)
853 return -1; /* #GP */
020df079 854 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
c8639010 855 kvm_update_dr7(vcpu);
020df079
GN		 856 break;
857 }
858
859 return 0;
860}
338dbc97
GN		 861
862int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
863{
16f8a6f9 864 if (__kvm_set_dr(vcpu, dr, val)) {
338dbc97 865 kvm_inject_gp(vcpu, 0);
16f8a6f9
NA		 866 return 1;
867 }
868 return 0;
338dbc97 869}
020df079
GN		 870EXPORT_SYMBOL_GPL(kvm_set_dr);
871
16f8a6f9 872int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
020df079
GN		 873{
874 switch (dr) {
875 case 0 ... 3:
876 *val = vcpu->arch.db[dr];
877 break;
878 case 4:
020df079
GN		 879 /* fall through */
880 case 6:
73aaf249
JK		 881 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
882 *val = vcpu->arch.dr6;
883 else
884 *val = kvm_x86_ops->get_dr6(vcpu);
020df079
GN		 885 break;
886 case 5:
020df079
GN		 887 /* fall through */
888 default: /* 7 */
889 *val = vcpu->arch.dr7;
890 break;
891 }
338dbc97
GN		 892 return 0;
893}
020df079
GN		 894EXPORT_SYMBOL_GPL(kvm_get_dr);
895
022cd0e8
AK		 896bool kvm_rdpmc(struct kvm_vcpu *vcpu)
897{
898 u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
899 u64 data;
900 int err;
901
902 err = kvm_pmu_read_pmc(vcpu, ecx, &data);
903 if (err)
904 return err;
905 kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
906 kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
907 return err;
908}
909EXPORT_SYMBOL_GPL(kvm_rdpmc);
910
043405e1
CO		 911/*
912 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
913 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
914 *
915 * This list is modified at module load time to reflect the
e3267cbb
GC		 916 * capabilities of the host cpu. This capabilities test skips MSRs that are
917 * kvm-specific. Those are put in the beginning of the list.
043405e1 918 */
e3267cbb 919
e984097b 920#define KVM_SAVE_MSRS_BEGIN 12
043405e1 921static u32 msrs_to_save[] = {
e3267cbb 922 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
11c6bffa 923 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
55cd8e5a 924 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
e984097b 925 HV_X64_MSR_TIME_REF_COUNT, HV_X64_MSR_REFERENCE_TSC,
c9aaa895 926 HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
ae7a2a3f 927 MSR_KVM_PV_EOI_EN,
043405e1 928 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
8c06585d 929 MSR_STAR,
043405e1
CO		 930#ifdef CONFIG_X86_64
931 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
932#endif
b3897a49 933 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
0dd376e7 934 MSR_IA32_FEATURE_CONTROL, MSR_IA32_BNDCFGS
043405e1
CO		 935};
936
937static unsigned num_msrs_to_save;
938
f1d24831 939static const u32 emulated_msrs[] = {
ba904635 940 MSR_IA32_TSC_ADJUST,
a3e06bbe 941 MSR_IA32_TSCDEADLINE,
043405e1 942 MSR_IA32_MISC_ENABLE,
908e75f3
AK		 943 MSR_IA32_MCG_STATUS,
944 MSR_IA32_MCG_CTL,
043405e1
CO		 945};
946
384bb783 947bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
15c4a640 948{
b69e8cae 949 if (efer & efer_reserved_bits)
384bb783 950 return false;
15c4a640 951
1b2fd70c
AG		 952 if (efer & EFER_FFXSR) {
953 struct kvm_cpuid_entry2 *feat;
954
955 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
b69e8cae 956 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
384bb783 957 return false;
1b2fd70c
AG		 958 }
959
d8017474
AG		 960 if (efer & EFER_SVME) {
961 struct kvm_cpuid_entry2 *feat;
962
963 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
b69e8cae 964 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
384bb783 965 return false;
d8017474
AG		 966 }
967
384bb783
JK		 968 return true;
969}
970EXPORT_SYMBOL_GPL(kvm_valid_efer);
971
972static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
973{
974 u64 old_efer = vcpu->arch.efer;
975
976 if (!kvm_valid_efer(vcpu, efer))
977 return 1;
978
979 if (is_paging(vcpu)
980 && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
981 return 1;
982
15c4a640 983 efer &= ~EFER_LMA;
f6801dff 984 efer |= vcpu->arch.efer & EFER_LMA;
15c4a640 985
a3d204e2
SY		 986 kvm_x86_ops->set_efer(vcpu, efer);
987
aad82703
SY		 988 /* Update reserved bits */
989 if ((efer ^ old_efer) & EFER_NX)
990 kvm_mmu_reset_context(vcpu);
991
b69e8cae 992 return 0;
15c4a640
CO		 993}
994
f2b4b7dd
JR		 995void kvm_enable_efer_bits(u64 mask)
996{
997 efer_reserved_bits &= ~mask;
998}
999EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
1000
15c4a640
CO		 1001/*
1002 * Writes msr value into into the appropriate "register".
1003 * Returns 0 on success, non-0 otherwise.
1004 * Assumes vcpu_load() was already called.
1005 */
8fe8ab46 1006int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
15c4a640 1007{
854e8bb1
NA		 1008 switch (msr->index) {
1009 case MSR_FS_BASE:
1010 case MSR_GS_BASE:
1011 case MSR_KERNEL_GS_BASE:
1012 case MSR_CSTAR:
1013 case MSR_LSTAR:
1014 if (is_noncanonical_address(msr->data))
1015 return 1;
1016 break;
1017 case MSR_IA32_SYSENTER_EIP:
1018 case MSR_IA32_SYSENTER_ESP:
1019 /*
1020 * IA32_SYSENTER_ESP and IA32_SYSENTER_EIP cause #GP if
1021 * non-canonical address is written on Intel but not on
1022 * AMD (which ignores the top 32-bits, because it does
1023 * not implement 64-bit SYSENTER).
1024 *
1025 * 64-bit code should hence be able to write a non-canonical
1026 * value on AMD. Making the address canonical ensures that
1027 * vmentry does not fail on Intel after writing a non-canonical
1028 * value, and that something deterministic happens if the guest
1029 * invokes 64-bit SYSENTER.
1030 */
1031 msr->data = get_canonical(msr->data);
1032 }
8fe8ab46 1033 return kvm_x86_ops->set_msr(vcpu, msr);
15c4a640 1034}
854e8bb1 1035EXPORT_SYMBOL_GPL(kvm_set_msr);
15c4a640 1036
313a3dc7
CO		 1037/*
1038 * Adapt set_msr() to msr_io()'s calling convention
1039 */
1040static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1041{
8fe8ab46
WA		 1042 struct msr_data msr;
1043
1044 msr.data = *data;
1045 msr.index = index;
1046 msr.host_initiated = true;
1047 return kvm_set_msr(vcpu, &msr);
313a3dc7
CO		 1048}
1049
16e8d74d
MT		 1050#ifdef CONFIG_X86_64
1051struct pvclock_gtod_data {
1052 seqcount_t seq;
1053
1054 struct { /* extract of a clocksource struct */
1055 int vclock_mode;
1056 cycle_t cycle_last;
1057 cycle_t mask;
1058 u32 mult;
1059 u32 shift;
1060 } clock;
1061
cbcf2dd3
TG		 1062 u64 boot_ns;
1063 u64 nsec_base;
16e8d74d
MT		 1064};
1065
1066static struct pvclock_gtod_data pvclock_gtod_data;
1067
1068static void update_pvclock_gtod(struct timekeeper *tk)
1069{
1070 struct pvclock_gtod_data *vdata = &pvclock_gtod_data;
cbcf2dd3
TG		 1071 u64 boot_ns;
1072
d28ede83 1073 boot_ns = ktime_to_ns(ktime_add(tk->tkr.base_mono, tk->offs_boot));
16e8d74d
MT		 1074
1075 write_seqcount_begin(&vdata->seq);
1076
1077 /* copy pvclock gtod data */
d28ede83
TG		 1078 vdata->clock.vclock_mode = tk->tkr.clock->archdata.vclock_mode;
1079 vdata->clock.cycle_last = tk->tkr.cycle_last;
1080 vdata->clock.mask = tk->tkr.mask;
1081 vdata->clock.mult = tk->tkr.mult;
1082 vdata->clock.shift = tk->tkr.shift;
16e8d74d 1083
cbcf2dd3 1084 vdata->boot_ns = boot_ns;
d28ede83 1085 vdata->nsec_base = tk->tkr.xtime_nsec;
16e8d74d
MT		 1086
1087 write_seqcount_end(&vdata->seq);
1088}
1089#endif
1090
bab5bb39
NK		 1091void kvm_set_pending_timer(struct kvm_vcpu *vcpu)
1092{
1093 /*
1094 * Note: KVM_REQ_PENDING_TIMER is implicitly checked in
1095 * vcpu_enter_guest. This function is only called from
1096 * the physical CPU that is running vcpu.
1097 */
1098 kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
1099}
16e8d74d 1100
18068523
GOC		 1101static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
1102{
9ed3c444
AK		 1103 int version;
1104 int r;
50d0a0f9 1105 struct pvclock_wall_clock wc;
923de3cf 1106 struct timespec boot;
18068523
GOC		 1107
1108 if (!wall_clock)
1109 return;
1110
9ed3c444
AK		 1111 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
1112 if (r)
1113 return;
1114
1115 if (version & 1)
1116 ++version; /* first time write, random junk */
1117
1118 ++version;
18068523 1119
18068523
GOC		 1120 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
1121
50d0a0f9
GH		 1122 /*
1123 * The guest calculates current wall clock time by adding
34c238a1 1124 * system time (updated by kvm_guest_time_update below) to the
50d0a0f9
GH		 1125 * wall clock specified here. guest system time equals host
1126 * system time for us, thus we must fill in host boot time here.
1127 */
923de3cf 1128 getboottime(&boot);
50d0a0f9 1129
4b648665
BR		 1130 if (kvm->arch.kvmclock_offset) {
1131 struct timespec ts = ns_to_timespec(kvm->arch.kvmclock_offset);
1132 boot = timespec_sub(boot, ts);
1133 }
50d0a0f9
GH		 1134 wc.sec = boot.tv_sec;
1135 wc.nsec = boot.tv_nsec;
1136 wc.version = version;
18068523
GOC		 1137
1138 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
1139
1140 version++;
1141 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
18068523
GOC		 1142}
1143
50d0a0f9
GH		 1144static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
1145{
1146 uint32_t quotient, remainder;
1147
1148 /* Don't try to replace with do_div(), this one calculates
1149 * "(dividend << 32) / divisor" */
1150 __asm__ ( "divl %4"
1151 : "=a" (quotient), "=d" (remainder)
1152 : "0" (0), "1" (dividend), "r" (divisor) );
1153 return quotient;
1154}
1155
5f4e3f88
ZA		 1156static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
1157 s8 *pshift, u32 *pmultiplier)
50d0a0f9 1158{
5f4e3f88 1159 uint64_t scaled64;
50d0a0f9
GH		 1160 int32_t shift = 0;
1161 uint64_t tps64;
1162 uint32_t tps32;
1163
5f4e3f88
ZA		 1164 tps64 = base_khz * 1000LL;
1165 scaled64 = scaled_khz * 1000LL;
50933623 1166 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
50d0a0f9
GH		 1167 tps64 >>= 1;
1168 shift--;
1169 }
1170
1171 tps32 = (uint32_t)tps64;
50933623
JK		 1172 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
1173 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
5f4e3f88
ZA		 1174 scaled64 >>= 1;
1175 else
1176 tps32 <<= 1;
50d0a0f9
GH		 1177 shift++;
1178 }
1179
5f4e3f88
ZA		 1180 *pshift = shift;
1181 *pmultiplier = div_frac(scaled64, tps32);
50d0a0f9 1182
5f4e3f88
ZA		 1183 pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
1184 __func__, base_khz, scaled_khz, shift, *pmultiplier);
50d0a0f9
GH		 1185}
1186
759379dd
ZA		 1187static inline u64 get_kernel_ns(void)
1188{
bb0b5812 1189 return ktime_get_boot_ns();
50d0a0f9
GH		 1190}
1191
d828199e 1192#ifdef CONFIG_X86_64
16e8d74d 1193static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0);
d828199e 1194#endif
16e8d74d 1195
c8076604 1196static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
69b0049a 1197static unsigned long max_tsc_khz;
c8076604 1198
cc578287 1199static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
8cfdc000 1200{
cc578287
ZA		 1201 return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
1202 vcpu->arch.virtual_tsc_shift);
8cfdc000
ZA		 1203}
1204
cc578287 1205static u32 adjust_tsc_khz(u32 khz, s32 ppm)
1e993611 1206{
cc578287
ZA		 1207 u64 v = (u64)khz * (1000000 + ppm);
1208 do_div(v, 1000000);
1209 return v;
1e993611
JR		 1210}
1211
cc578287 1212static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz)
759379dd 1213{
cc578287
ZA		 1214 u32 thresh_lo, thresh_hi;
1215 int use_scaling = 0;
217fc9cf 1216
03ba32ca
MT		 1217 /* tsc_khz can be zero if TSC calibration fails */
1218 if (this_tsc_khz == 0)
1219 return;
1220
c285545f
ZA		 1221 /* Compute a scale to convert nanoseconds in TSC cycles */
1222 kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
cc578287
ZA		 1223 &vcpu->arch.virtual_tsc_shift,
1224 &vcpu->arch.virtual_tsc_mult);
1225 vcpu->arch.virtual_tsc_khz = this_tsc_khz;
1226
1227 /*
1228 * Compute the variation in TSC rate which is acceptable
1229 * within the range of tolerance and decide if the
1230 * rate being applied is within that bounds of the hardware
1231 * rate. If so, no scaling or compensation need be done.
1232 */
1233 thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
1234 thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
1235 if (this_tsc_khz < thresh_lo || this_tsc_khz > thresh_hi) {
1236 pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", this_tsc_khz, thresh_lo, thresh_hi);
1237 use_scaling = 1;
1238 }
1239 kvm_x86_ops->set_tsc_khz(vcpu, this_tsc_khz, use_scaling);
c285545f
ZA		 1240}
1241
1242static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1243{
e26101b1 1244 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
cc578287
ZA		 1245 vcpu->arch.virtual_tsc_mult,
1246 vcpu->arch.virtual_tsc_shift);
e26101b1 1247 tsc += vcpu->arch.this_tsc_write;
c285545f
ZA		 1248 return tsc;
1249}
1250
69b0049a 1251static void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
b48aa97e
MT		 1252{
1253#ifdef CONFIG_X86_64
1254 bool vcpus_matched;
b48aa97e
MT		 1255 struct kvm_arch *ka = &vcpu->kvm->arch;
1256 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
1257
1258 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
1259 atomic_read(&vcpu->kvm->online_vcpus));
1260
7f187922
MT		 1261 /*
1262 * Once the masterclock is enabled, always perform request in
1263 * order to update it.
1264 *
1265 * In order to enable masterclock, the host clocksource must be TSC
1266 * and the vcpus need to have matched TSCs. When that happens,
1267 * perform request to enable masterclock.
1268 */
1269 if (ka->use_master_clock ||
1270 (gtod->clock.vclock_mode == VCLOCK_TSC && vcpus_matched))
b48aa97e
MT		 1271 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
1272
1273 trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc,
1274 atomic_read(&vcpu->kvm->online_vcpus),
1275 ka->use_master_clock, gtod->clock.vclock_mode);
1276#endif
1277}
1278
ba904635
WA		 1279static void update_ia32_tsc_adjust_msr(struct kvm_vcpu *vcpu, s64 offset)
1280{
1281 u64 curr_offset = kvm_x86_ops->read_tsc_offset(vcpu);
1282 vcpu->arch.ia32_tsc_adjust_msr += offset - curr_offset;
1283}
1284
8fe8ab46 1285void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr)
99e3e30a
ZA		 1286{
1287 struct kvm *kvm = vcpu->kvm;
f38e098f 1288 u64 offset, ns, elapsed;
99e3e30a 1289 unsigned long flags;
02626b6a 1290 s64 usdiff;
b48aa97e 1291 bool matched;
0d3da0d2 1292 bool already_matched;
8fe8ab46 1293 u64 data = msr->data;
99e3e30a 1294
038f8c11 1295 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
857e4099 1296 offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
759379dd 1297 ns = get_kernel_ns();
f38e098f 1298 elapsed = ns - kvm->arch.last_tsc_nsec;
5d3cb0f6 1299
03ba32ca 1300 if (vcpu->arch.virtual_tsc_khz) {
8915aa27
MT		 1301 int faulted = 0;
1302
03ba32ca
MT		 1303 /* n.b - signed multiplication and division required */
1304 usdiff = data - kvm->arch.last_tsc_write;
5d3cb0f6 1305#ifdef CONFIG_X86_64
03ba32ca 1306 usdiff = (usdiff * 1000) / vcpu->arch.virtual_tsc_khz;
5d3cb0f6 1307#else
03ba32ca 1308 /* do_div() only does unsigned */
8915aa27
MT		 1309 asm("1: idivl %[divisor]\n"
1310 "2: xor %%edx, %%edx\n"
1311 " movl $0, %[faulted]\n"
1312 "3:\n"
1313 ".section .fixup,\"ax\"\n"
1314 "4: movl $1, %[faulted]\n"
1315 " jmp 3b\n"
1316 ".previous\n"
1317
1318 _ASM_EXTABLE(1b, 4b)
1319
1320 : "=A"(usdiff), [faulted] "=r" (faulted)
1321 : "A"(usdiff * 1000), [divisor] "rm"(vcpu->arch.virtual_tsc_khz));
1322
5d3cb0f6 1323#endif
03ba32ca
MT		 1324 do_div(elapsed, 1000);
1325 usdiff -= elapsed;
1326 if (usdiff < 0)
1327 usdiff = -usdiff;
8915aa27
MT		 1328
1329 /* idivl overflow => difference is larger than USEC_PER_SEC */
1330 if (faulted)
1331 usdiff = USEC_PER_SEC;
03ba32ca
MT		 1332 } else
1333 usdiff = USEC_PER_SEC; /* disable TSC match window below */
f38e098f
ZA		 1334
1335 /*
5d3cb0f6
ZA		 1336 * Special case: TSC write with a small delta (1 second) of virtual
1337 * cycle time against real time is interpreted as an attempt to
1338 * synchronize the CPU.
1339 *
1340 * For a reliable TSC, we can match TSC offsets, and for an unstable
1341 * TSC, we add elapsed time in this computation. We could let the
1342 * compensation code attempt to catch up if we fall behind, but
1343 * it's better to try to match offsets from the beginning.
1344 */
02626b6a 1345 if (usdiff < USEC_PER_SEC &&
5d3cb0f6 1346 vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
f38e098f 1347 if (!check_tsc_unstable()) {
e26101b1 1348 offset = kvm->arch.cur_tsc_offset;
f38e098f
ZA		 1349 pr_debug("kvm: matched tsc offset for %llu\n", data);
1350 } else {
857e4099 1351 u64 delta = nsec_to_cycles(vcpu, elapsed);
5d3cb0f6
ZA		 1352 data += delta;
1353 offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
759379dd 1354 pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
f38e098f 1355 }
b48aa97e 1356 matched = true;
0d3da0d2 1357 already_matched = (vcpu->arch.this_tsc_generation == kvm->arch.cur_tsc_generation);
e26101b1
ZA		 1358 } else {
1359 /*
1360 * We split periods of matched TSC writes into generations.
1361 * For each generation, we track the original measured
1362 * nanosecond time, offset, and write, so if TSCs are in
1363 * sync, we can match exact offset, and if not, we can match
4a969980 1364 * exact software computation in compute_guest_tsc()
e26101b1
ZA		 1365 *
1366 * These values are tracked in kvm->arch.cur_xxx variables.
1367 */
1368 kvm->arch.cur_tsc_generation++;
1369 kvm->arch.cur_tsc_nsec = ns;
1370 kvm->arch.cur_tsc_write = data;
1371 kvm->arch.cur_tsc_offset = offset;
b48aa97e 1372 matched = false;
0d3da0d2 1373 pr_debug("kvm: new tsc generation %llu, clock %llu\n",
e26101b1 1374 kvm->arch.cur_tsc_generation, data);
f38e098f 1375 }
e26101b1
ZA		 1376
1377 /*
1378 * We also track th most recent recorded KHZ, write and time to
1379 * allow the matching interval to be extended at each write.
1380 */
f38e098f
ZA		 1381 kvm->arch.last_tsc_nsec = ns;
1382 kvm->arch.last_tsc_write = data;
5d3cb0f6 1383 kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
99e3e30a 1384
b183aa58 1385 vcpu->arch.last_guest_tsc = data;
e26101b1
ZA		 1386
1387 /* Keep track of which generation this VCPU has synchronized to */
1388 vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
1389 vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
1390 vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
1391
ba904635
WA		 1392 if (guest_cpuid_has_tsc_adjust(vcpu) && !msr->host_initiated)
1393 update_ia32_tsc_adjust_msr(vcpu, offset);
e26101b1
ZA		 1394 kvm_x86_ops->write_tsc_offset(vcpu, offset);
1395 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
b48aa97e
MT		 1396
1397 spin_lock(&kvm->arch.pvclock_gtod_sync_lock);
0d3da0d2 1398 if (!matched) {
b48aa97e 1399 kvm->arch.nr_vcpus_matched_tsc = 0;
0d3da0d2
TG		 1400 } else if (!already_matched) {
1401 kvm->arch.nr_vcpus_matched_tsc++;
1402 }
b48aa97e
MT		 1403
1404 kvm_track_tsc_matching(vcpu);
1405 spin_unlock(&kvm->arch.pvclock_gtod_sync_lock);
99e3e30a 1406}
e26101b1 1407
99e3e30a
ZA		 1408EXPORT_SYMBOL_GPL(kvm_write_tsc);
1409
d828199e
MT		 1410#ifdef CONFIG_X86_64
1411
1412static cycle_t read_tsc(void)
1413{
1414 cycle_t ret;
1415 u64 last;
1416
1417 /*
1418 * Empirically, a fence (of type that depends on the CPU)
1419 * before rdtsc is enough to ensure that rdtsc is ordered
1420 * with respect to loads. The various CPU manuals are unclear
1421 * as to whether rdtsc can be reordered with later loads,
1422 * but no one has ever seen it happen.
1423 */
1424 rdtsc_barrier();
1425 ret = (cycle_t)vget_cycles();
1426
1427 last = pvclock_gtod_data.clock.cycle_last;
1428
1429 if (likely(ret >= last))
1430 return ret;
1431
1432 /*
1433 * GCC likes to generate cmov here, but this branch is extremely
1434 * predictable (it's just a funciton of time and the likely is
1435 * very likely) and there's a data dependence, so force GCC
1436 * to generate a branch instead. I don't barrier() because
1437 * we don't actually need a barrier, and if this function
1438 * ever gets inlined it will generate worse code.
1439 */
1440 asm volatile ("");
1441 return last;
1442}
1443
1444static inline u64 vgettsc(cycle_t *cycle_now)
1445{
1446 long v;
1447 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
1448
1449 *cycle_now = read_tsc();
1450
1451 v = (*cycle_now - gtod->clock.cycle_last) & gtod->clock.mask;
1452 return v * gtod->clock.mult;
1453}
1454
cbcf2dd3 1455static int do_monotonic_boot(s64 *t, cycle_t *cycle_now)
d828199e 1456{
cbcf2dd3 1457 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
d828199e 1458 unsigned long seq;
d828199e 1459 int mode;
cbcf2dd3 1460 u64 ns;
d828199e 1461
d828199e
MT		 1462 do {
1463 seq = read_seqcount_begin(&gtod->seq);
1464 mode = gtod->clock.vclock_mode;
cbcf2dd3 1465 ns = gtod->nsec_base;
d828199e
MT		 1466 ns += vgettsc(cycle_now);
1467 ns >>= gtod->clock.shift;
cbcf2dd3 1468 ns += gtod->boot_ns;
d828199e 1469 } while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
cbcf2dd3 1470 *t = ns;
d828199e
MT		 1471
1472 return mode;
1473}
1474
1475/* returns true if host is using tsc clocksource */
1476static bool kvm_get_time_and_clockread(s64 *kernel_ns, cycle_t *cycle_now)
1477{
d828199e
MT		 1478 /* checked again under seqlock below */
1479 if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC)
1480 return false;
1481
cbcf2dd3 1482 return do_monotonic_boot(kernel_ns, cycle_now) == VCLOCK_TSC;
d828199e
MT		 1483}
1484#endif
1485
1486/*
1487 *
b48aa97e
MT		 1488 * Assuming a stable TSC across physical CPUS, and a stable TSC
1489 * across virtual CPUs, the following condition is possible.
1490 * Each numbered line represents an event visible to both
d828199e
MT		 1491 * CPUs at the next numbered event.
1492 *
1493 * "timespecX" represents host monotonic time. "tscX" represents
1494 * RDTSC value.
1495 *
1496 * VCPU0 on CPU0 | VCPU1 on CPU1
1497 *
1498 * 1. read timespec0,tsc0
1499 * 2. | timespec1 = timespec0 + N
1500 * | tsc1 = tsc0 + M
1501 * 3. transition to guest | transition to guest
1502 * 4. ret0 = timespec0 + (rdtsc - tsc0) |
1503 * 5. | ret1 = timespec1 + (rdtsc - tsc1)
1504 * | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
1505 *
1506 * Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
1507 *
1508 * - ret0 < ret1
1509 * - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
1510 * ...
1511 * - 0 < N - M => M < N
1512 *
1513 * That is, when timespec0 != timespec1, M < N. Unfortunately that is not
1514 * always the case (the difference between two distinct xtime instances
1515 * might be smaller then the difference between corresponding TSC reads,
1516 * when updating guest vcpus pvclock areas).
1517 *
1518 * To avoid that problem, do not allow visibility of distinct
1519 * system_timestamp/tsc_timestamp values simultaneously: use a master
1520 * copy of host monotonic time values. Update that master copy
1521 * in lockstep.
1522 *
b48aa97e 1523 * Rely on synchronization of host TSCs and guest TSCs for monotonicity.
d828199e
MT		 1524 *
1525 */
1526
1527static void pvclock_update_vm_gtod_copy(struct kvm *kvm)
1528{
1529#ifdef CONFIG_X86_64
1530 struct kvm_arch *ka = &kvm->arch;
1531 int vclock_mode;
b48aa97e
MT		 1532 bool host_tsc_clocksource, vcpus_matched;
1533
1534 vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
1535 atomic_read(&kvm->online_vcpus));
d828199e
MT		 1536
1537 /*
1538 * If the host uses TSC clock, then passthrough TSC as stable
1539 * to the guest.
1540 */
b48aa97e 1541 host_tsc_clocksource = kvm_get_time_and_clockread(
d828199e
MT		 1542 &ka->master_kernel_ns,
1543 &ka->master_cycle_now);
1544
16a96021 1545 ka->use_master_clock = host_tsc_clocksource && vcpus_matched
54750f2c
MT		 1546 && !backwards_tsc_observed
1547 && !ka->boot_vcpu_runs_old_kvmclock;
b48aa97e 1548
d828199e
MT		 1549 if (ka->use_master_clock)
1550 atomic_set(&kvm_guest_has_master_clock, 1);
1551
1552 vclock_mode = pvclock_gtod_data.clock.vclock_mode;
b48aa97e
MT		 1553 trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode,
1554 vcpus_matched);
d828199e
MT		 1555#endif
1556}
1557
2e762ff7
MT		 1558static void kvm_gen_update_masterclock(struct kvm *kvm)
1559{
1560#ifdef CONFIG_X86_64
1561 int i;
1562 struct kvm_vcpu *vcpu;
1563 struct kvm_arch *ka = &kvm->arch;
1564
1565 spin_lock(&ka->pvclock_gtod_sync_lock);
1566 kvm_make_mclock_inprogress_request(kvm);
1567 /* no guest entries from this point */
1568 pvclock_update_vm_gtod_copy(kvm);
1569
1570 kvm_for_each_vcpu(i, vcpu, kvm)
105b21bb 1571 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2e762ff7
MT		 1572
1573 /* guest entries allowed */
1574 kvm_for_each_vcpu(i, vcpu, kvm)
1575 clear_bit(KVM_REQ_MCLOCK_INPROGRESS, &vcpu->requests);
1576
1577 spin_unlock(&ka->pvclock_gtod_sync_lock);
1578#endif
1579}
1580
34c238a1 1581static int kvm_guest_time_update(struct kvm_vcpu *v)
18068523 1582{
d828199e 1583 unsigned long flags, this_tsc_khz;
18068523 1584 struct kvm_vcpu_arch *vcpu = &v->arch;
d828199e 1585 struct kvm_arch *ka = &v->kvm->arch;
f25e656d 1586 s64 kernel_ns;
d828199e 1587 u64 tsc_timestamp, host_tsc;
0b79459b 1588 struct pvclock_vcpu_time_info guest_hv_clock;
51d59c6b 1589 u8 pvclock_flags;
d828199e
MT		 1590 bool use_master_clock;
1591
1592 kernel_ns = 0;
1593 host_tsc = 0;
18068523 1594
d828199e
MT		 1595 /*
1596 * If the host uses TSC clock, then passthrough TSC as stable
1597 * to the guest.
1598 */
1599 spin_lock(&ka->pvclock_gtod_sync_lock);
1600 use_master_clock = ka->use_master_clock;
1601 if (use_master_clock) {
1602 host_tsc = ka->master_cycle_now;
1603 kernel_ns = ka->master_kernel_ns;
1604 }
1605 spin_unlock(&ka->pvclock_gtod_sync_lock);
c09664bb
MT		 1606
1607 /* Keep irq disabled to prevent changes to the clock */
1608 local_irq_save(flags);
89cbc767 1609 this_tsc_khz = __this_cpu_read(cpu_tsc_khz);
c09664bb
MT		 1610 if (unlikely(this_tsc_khz == 0)) {
1611 local_irq_restore(flags);
1612 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1613 return 1;
1614 }
d828199e
MT		 1615 if (!use_master_clock) {
1616 host_tsc = native_read_tsc();
1617 kernel_ns = get_kernel_ns();
1618 }
1619
1620 tsc_timestamp = kvm_x86_ops->read_l1_tsc(v, host_tsc);
1621
c285545f
ZA		 1622 /*
1623 * We may have to catch up the TSC to match elapsed wall clock
1624 * time for two reasons, even if kvmclock is used.
1625 * 1) CPU could have been running below the maximum TSC rate
1626 * 2) Broken TSC compensation resets the base at each VCPU
1627 * entry to avoid unknown leaps of TSC even when running
1628 * again on the same CPU. This may cause apparent elapsed
1629 * time to disappear, and the guest to stand still or run
1630 * very slowly.
1631 */
1632 if (vcpu->tsc_catchup) {
1633 u64 tsc = compute_guest_tsc(v, kernel_ns);
1634 if (tsc > tsc_timestamp) {
f1e2b260 1635 adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
c285545f
ZA		 1636 tsc_timestamp = tsc;
1637 }
50d0a0f9
GH		 1638 }
1639
18068523
GOC		 1640 local_irq_restore(flags);
1641
0b79459b 1642 if (!vcpu->pv_time_enabled)
c285545f 1643 return 0;
18068523 1644
e48672fa 1645 if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
5f4e3f88
ZA		 1646 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1647 &vcpu->hv_clock.tsc_shift,
1648 &vcpu->hv_clock.tsc_to_system_mul);
e48672fa 1649 vcpu->hw_tsc_khz = this_tsc_khz;
8cfdc000
ZA		 1650 }
1651
1652 /* With all the info we got, fill in the values */
1d5f066e 1653 vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
759379dd 1654 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
28e4639a 1655 vcpu->last_guest_tsc = tsc_timestamp;
51d59c6b 1656
09a0c3f1
OH		 1657 if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time,
1658 &guest_hv_clock, sizeof(guest_hv_clock))))
1659 return 0;
1660
18068523
GOC		 1661 /*
1662 * The interface expects us to write an even number signaling that the
1663 * update is finished. Since the guest won't see the intermediate
50d0a0f9 1664 * state, we just increase by 2 at the end.
18068523 1665 */
09a0c3f1 1666 vcpu->hv_clock.version = guest_hv_clock.version + 2;
78c0337a
MT		 1667
1668 /* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
0b79459b 1669 pvclock_flags = (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED);
78c0337a
MT		 1670
1671 if (vcpu->pvclock_set_guest_stopped_request) {
1672 pvclock_flags |= PVCLOCK_GUEST_STOPPED;
1673 vcpu->pvclock_set_guest_stopped_request = false;
1674 }
1675
d828199e
MT		 1676 /* If the host uses TSC clocksource, then it is stable */
1677 if (use_master_clock)
1678 pvclock_flags |= PVCLOCK_TSC_STABLE_BIT;
1679
78c0337a
MT		 1680 vcpu->hv_clock.flags = pvclock_flags;
1681
ce1a5e60
DM		 1682 trace_kvm_pvclock_update(v->vcpu_id, &vcpu->hv_clock);
1683
0b79459b
AH		 1684 kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
1685 &vcpu->hv_clock,
1686 sizeof(vcpu->hv_clock));
8cfdc000 1687 return 0;
c8076604
GH		 1688}
1689
0061d53d
MT		 1690/*
1691 * kvmclock updates which are isolated to a given vcpu, such as
1692 * vcpu->cpu migration, should not allow system_timestamp from
1693 * the rest of the vcpus to remain static. Otherwise ntp frequency
1694 * correction applies to one vcpu's system_timestamp but not
1695 * the others.
1696 *
1697 * So in those cases, request a kvmclock update for all vcpus.
7e44e449
AJ		 1698 * We need to rate-limit these requests though, as they can
1699 * considerably slow guests that have a large number of vcpus.
1700 * The time for a remote vcpu to update its kvmclock is bound
1701 * by the delay we use to rate-limit the updates.
0061d53d
MT		 1702 */
1703
7e44e449
AJ		 1704#define KVMCLOCK_UPDATE_DELAY msecs_to_jiffies(100)
1705
1706static void kvmclock_update_fn(struct work_struct *work)
0061d53d
MT		 1707{
1708 int i;
7e44e449
AJ		 1709 struct delayed_work *dwork = to_delayed_work(work);
1710 struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
1711 kvmclock_update_work);
1712 struct kvm *kvm = container_of(ka, struct kvm, arch);
0061d53d
MT		 1713 struct kvm_vcpu *vcpu;
1714
1715 kvm_for_each_vcpu(i, vcpu, kvm) {
105b21bb 1716 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
0061d53d
MT		 1717 kvm_vcpu_kick(vcpu);
1718 }
1719}
1720
7e44e449
AJ		 1721static void kvm_gen_kvmclock_update(struct kvm_vcpu *v)
1722{
1723 struct kvm *kvm = v->kvm;
1724
105b21bb 1725 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
7e44e449
AJ		 1726 schedule_delayed_work(&kvm->arch.kvmclock_update_work,
1727 KVMCLOCK_UPDATE_DELAY);
1728}
1729
332967a3
AJ		 1730#define KVMCLOCK_SYNC_PERIOD (300 * HZ)
1731
1732static void kvmclock_sync_fn(struct work_struct *work)
1733{
1734 struct delayed_work *dwork = to_delayed_work(work);
1735 struct kvm_arch *ka = container_of(dwork, struct kvm_arch,
1736 kvmclock_sync_work);
1737 struct kvm *kvm = container_of(ka, struct kvm, arch);
1738
1739 schedule_delayed_work(&kvm->arch.kvmclock_update_work, 0);
1740 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
1741 KVMCLOCK_SYNC_PERIOD);
1742}
1743
9ba075a6
AK		 1744static bool msr_mtrr_valid(unsigned msr)
1745{
1746 switch (msr) {
1747 case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1748 case MSR_MTRRfix64K_00000:
1749 case MSR_MTRRfix16K_80000:
1750 case MSR_MTRRfix16K_A0000:
1751 case MSR_MTRRfix4K_C0000:
1752 case MSR_MTRRfix4K_C8000:
1753 case MSR_MTRRfix4K_D0000:
1754 case MSR_MTRRfix4K_D8000:
1755 case MSR_MTRRfix4K_E0000:
1756 case MSR_MTRRfix4K_E8000:
1757 case MSR_MTRRfix4K_F0000:
1758 case MSR_MTRRfix4K_F8000:
1759 case MSR_MTRRdefType:
1760 case MSR_IA32_CR_PAT:
1761 return true;
1762 case 0x2f8:
1763 return true;
1764 }
1765 return false;
1766}
1767
d6289b93
MT		 1768static bool valid_pat_type(unsigned t)
1769{
1770 return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1771}
1772
1773static bool valid_mtrr_type(unsigned t)
1774{
1775 return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1776}
1777
4566654b 1778bool kvm_mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
d6289b93
MT		 1779{
1780 int i;
fd275235 1781 u64 mask;
d6289b93
MT		 1782
1783 if (!msr_mtrr_valid(msr))
1784 return false;
1785
1786 if (msr == MSR_IA32_CR_PAT) {
1787 for (i = 0; i < 8; i++)
1788 if (!valid_pat_type((data >> (i * 8)) & 0xff))
1789 return false;
1790 return true;
1791 } else if (msr == MSR_MTRRdefType) {
1792 if (data & ~0xcff)
1793 return false;
1794 return valid_mtrr_type(data & 0xff);
1795 } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1796 for (i = 0; i < 8 ; i++)
1797 if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1798 return false;
1799 return true;
1800 }
1801
1802 /* variable MTRRs */
adfb5d27
WL		 1803 WARN_ON(!(msr >= 0x200 && msr < 0x200 + 2 * KVM_NR_VAR_MTRR));
1804
fd275235 1805 mask = (~0ULL) << cpuid_maxphyaddr(vcpu);
d7a2a246 1806 if ((msr & 1) == 0) {
adfb5d27 1807 /* MTRR base */
d7a2a246
WL		 1808 if (!valid_mtrr_type(data & 0xff))
1809 return false;
1810 mask |= 0xf00;
1811 } else
1812 /* MTRR mask */
1813 mask |= 0x7ff;
1814 if (data & mask) {
1815 kvm_inject_gp(vcpu, 0);
1816 return false;
1817 }
1818
adfb5d27 1819 return true;
d6289b93 1820}
4566654b 1821EXPORT_SYMBOL_GPL(kvm_mtrr_valid);
d6289b93 1822
9ba075a6
AK		 1823static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1824{
0bed3b56
SY		 1825 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1826
4566654b 1827 if (!kvm_mtrr_valid(vcpu, msr, data))
9ba075a6
AK		 1828 return 1;
1829
0bed3b56
SY		 1830 if (msr == MSR_MTRRdefType) {
1831 vcpu->arch.mtrr_state.def_type = data;
1832 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1833 } else if (msr == MSR_MTRRfix64K_00000)
1834 p[0] = data;
1835 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1836 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1837 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1838 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1839 else if (msr == MSR_IA32_CR_PAT)
1840 vcpu->arch.pat = data;
1841 else { /* Variable MTRRs */
1842 int idx, is_mtrr_mask;
1843 u64 *pt;
1844
1845 idx = (msr - 0x200) / 2;
1846 is_mtrr_mask = msr - 0x200 - 2 * idx;
1847 if (!is_mtrr_mask)
1848 pt =
1849 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1850 else
1851 pt =
1852 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1853 *pt = data;
1854 }
1855
1856 kvm_mmu_reset_context(vcpu);
9ba075a6
AK		 1857 return 0;
1858}
15c4a640 1859
890ca9ae 1860static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
15c4a640 1861{
890ca9ae
HY		 1862 u64 mcg_cap = vcpu->arch.mcg_cap;
1863 unsigned bank_num = mcg_cap & 0xff;
1864
15c4a640 1865 switch (msr) {
15c4a640 1866 case MSR_IA32_MCG_STATUS:
890ca9ae 1867 vcpu->arch.mcg_status = data;
15c4a640 1868 break;
c7ac679c 1869 case MSR_IA32_MCG_CTL:
890ca9ae
HY		 1870 if (!(mcg_cap & MCG_CTL_P))
1871 return 1;
1872 if (data != 0 && data != ~(u64)0)
1873 return -1;
1874 vcpu->arch.mcg_ctl = data;
1875 break;
1876 default:
1877 if (msr >= MSR_IA32_MC0_CTL &&
81760dcc 1878 msr < MSR_IA32_MCx_CTL(bank_num)) {
890ca9ae 1879 u32 offset = msr - MSR_IA32_MC0_CTL;
114be429
AP		 1880 /* only 0 or all 1s can be written to IA32_MCi_CTL
1881 * some Linux kernels though clear bit 10 in bank 4 to
1882 * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1883 * this to avoid an uncatched #GP in the guest
1884 */
890ca9ae 1885 if ((offset & 0x3) == 0 &&
114be429 1886 data != 0 && (data | (1 << 10)) != ~(u64)0)
890ca9ae
HY		 1887 return -1;
1888 vcpu->arch.mce_banks[offset] = data;
1889 break;
1890 }
1891 return 1;
1892 }
1893 return 0;
1894}
1895
ffde22ac
ES		 1896static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1897{
1898 struct kvm *kvm = vcpu->kvm;
1899 int lm = is_long_mode(vcpu);
1900 u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1901 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1902 u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1903 : kvm->arch.xen_hvm_config.blob_size_32;
1904 u32 page_num = data & ~PAGE_MASK;
1905 u64 page_addr = data & PAGE_MASK;
1906 u8 *page;
1907 int r;
1908
1909 r = -E2BIG;
1910 if (page_num >= blob_size)
1911 goto out;
1912 r = -ENOMEM;
ff5c2c03
SL		 1913 page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
1914 if (IS_ERR(page)) {
1915 r = PTR_ERR(page);
ffde22ac 1916 goto out;
ff5c2c03 1917 }
ffde22ac
ES		 1918 if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1919 goto out_free;
1920 r = 0;
1921out_free:
1922 kfree(page);
1923out:
1924 return r;
1925}
1926
55cd8e5a
GN		 1927static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1928{
1929 return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1930}
1931
1932static bool kvm_hv_msr_partition_wide(u32 msr)
1933{
1934 bool r = false;
1935 switch (msr) {
1936 case HV_X64_MSR_GUEST_OS_ID:
1937 case HV_X64_MSR_HYPERCALL:
e984097b
VR		 1938 case HV_X64_MSR_REFERENCE_TSC:
1939 case HV_X64_MSR_TIME_REF_COUNT:
55cd8e5a
GN		 1940 r = true;
1941 break;
1942 }
1943
1944 return r;
1945}
1946
1947static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1948{
1949 struct kvm *kvm = vcpu->kvm;
1950
1951 switch (msr) {
1952 case HV_X64_MSR_GUEST_OS_ID:
1953 kvm->arch.hv_guest_os_id = data;
1954 /* setting guest os id to zero disables hypercall page */
1955 if (!kvm->arch.hv_guest_os_id)
1956 kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1957 break;
1958 case HV_X64_MSR_HYPERCALL: {
1959 u64 gfn;
1960 unsigned long addr;
1961 u8 instructions[4];
1962
1963 /* if guest os id is not set hypercall should remain disabled */
1964 if (!kvm->arch.hv_guest_os_id)
1965 break;
1966 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1967 kvm->arch.hv_hypercall = data;
1968 break;
1969 }
1970 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1971 addr = gfn_to_hva(kvm, gfn);
1972 if (kvm_is_error_hva(addr))
1973 return 1;
1974 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1975 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
8b0cedff 1976 if (__copy_to_user((void __user *)addr, instructions, 4))
55cd8e5a
GN		 1977 return 1;
1978 kvm->arch.hv_hypercall = data;
b94b64c9 1979 mark_page_dirty(kvm, gfn);
55cd8e5a
GN		 1980 break;
1981 }
e984097b
VR		 1982 case HV_X64_MSR_REFERENCE_TSC: {
1983 u64 gfn;
1984 HV_REFERENCE_TSC_PAGE tsc_ref;
1985 memset(&tsc_ref, 0, sizeof(tsc_ref));
1986 kvm->arch.hv_tsc_page = data;
1987 if (!(data & HV_X64_MSR_TSC_REFERENCE_ENABLE))
1988 break;
1989 gfn = data >> HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT;
e1fa108d 1990 if (kvm_write_guest(kvm, gfn << HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT,
e984097b
VR		 1991 &tsc_ref, sizeof(tsc_ref)))
1992 return 1;
1993 mark_page_dirty(kvm, gfn);
1994 break;
1995 }
55cd8e5a 1996 default:
a737f256
CD		 1997 vcpu_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1998 "data 0x%llx\n", msr, data);
55cd8e5a
GN		 1999 return 1;
2000 }
2001 return 0;
2002}
2003
2004static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
2005{
10388a07
GN		 2006 switch (msr) {
2007 case HV_X64_MSR_APIC_ASSIST_PAGE: {
b3af1e88 2008 u64 gfn;
10388a07 2009 unsigned long addr;
55cd8e5a 2010
10388a07
GN		 2011 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
2012 vcpu->arch.hv_vapic = data;
b63cf42f
MT		 2013 if (kvm_lapic_enable_pv_eoi(vcpu, 0))
2014 return 1;
10388a07
GN		 2015 break;
2016 }
b3af1e88
VR		 2017 gfn = data >> HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT;
2018 addr = gfn_to_hva(vcpu->kvm, gfn);
10388a07
GN		 2019 if (kvm_is_error_hva(addr))
2020 return 1;
8b0cedff 2021 if (__clear_user((void __user *)addr, PAGE_SIZE))
10388a07
GN		 2022 return 1;
2023 vcpu->arch.hv_vapic = data;
b3af1e88 2024 mark_page_dirty(vcpu->kvm, gfn);
b63cf42f
MT		 2025 if (kvm_lapic_enable_pv_eoi(vcpu, gfn_to_gpa(gfn) | KVM_MSR_ENABLED))
2026 return 1;
10388a07
GN		 2027 break;
2028 }
2029 case HV_X64_MSR_EOI:
2030 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
2031 case HV_X64_MSR_ICR:
2032 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
2033 case HV_X64_MSR_TPR:
2034 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
2035 default:
a737f256
CD		 2036 vcpu_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
2037 "data 0x%llx\n", msr, data);
10388a07
GN		 2038 return 1;
2039 }
2040
2041 return 0;
55cd8e5a
GN		 2042}
2043
344d9588
GN		 2044static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
2045{
2046 gpa_t gpa = data & ~0x3f;
2047
4a969980 2048 /* Bits 2:5 are reserved, Should be zero */
6adba527 2049 if (data & 0x3c)
344d9588
GN		 2050 return 1;
2051
2052 vcpu->arch.apf.msr_val = data;
2053
2054 if (!(data & KVM_ASYNC_PF_ENABLED)) {
2055 kvm_clear_async_pf_completion_queue(vcpu);
2056 kvm_async_pf_hash_reset(vcpu);
2057 return 0;
2058 }
2059
8f964525
AH		 2060 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
2061 sizeof(u32)))
344d9588
GN		 2062 return 1;
2063
6adba527 2064 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
344d9588
GN		 2065 kvm_async_pf_wakeup_all(vcpu);
2066 return 0;
2067}
2068
12f9a48f
GC		 2069static void kvmclock_reset(struct kvm_vcpu *vcpu)
2070{
0b79459b 2071 vcpu->arch.pv_time_enabled = false;
12f9a48f
GC		 2072}
2073
c9aaa895
GC		 2074static void accumulate_steal_time(struct kvm_vcpu *vcpu)
2075{
2076 u64 delta;
2077
2078 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
2079 return;
2080
2081 delta = current->sched_info.run_delay - vcpu->arch.st.last_steal;
2082 vcpu->arch.st.last_steal = current->sched_info.run_delay;
2083 vcpu->arch.st.accum_steal = delta;
2084}
2085
2086static void record_steal_time(struct kvm_vcpu *vcpu)
2087{
2088 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
2089 return;
2090
2091 if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
2092 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
2093 return;
2094
2095 vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal;
2096 vcpu->arch.st.steal.version += 2;
2097 vcpu->arch.st.accum_steal = 0;
2098
2099 kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
2100 &vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
2101}
2102
8fe8ab46 2103int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
15c4a640 2104{
5753785f 2105 bool pr = false;
8fe8ab46
WA		 2106 u32 msr = msr_info->index;
2107 u64 data = msr_info->data;
5753785f 2108
15c4a640 2109 switch (msr) {
2e32b719
BP		 2110 case MSR_AMD64_NB_CFG:
2111 case MSR_IA32_UCODE_REV:
2112 case MSR_IA32_UCODE_WRITE:
2113 case MSR_VM_HSAVE_PA:
2114 case MSR_AMD64_PATCH_LOADER:
2115 case MSR_AMD64_BU_CFG2:
2116 break;
2117
15c4a640 2118 case MSR_EFER:
b69e8cae 2119 return set_efer(vcpu, data);
8f1589d9
AP		 2120 case MSR_K7_HWCR:
2121 data &= ~(u64)0x40; /* ignore flush filter disable */
82494028 2122 data &= ~(u64)0x100; /* ignore ignne emulation enable */
a223c313 2123 data &= ~(u64)0x8; /* ignore TLB cache disable */
22d48b2d 2124 data &= ~(u64)0x40000; /* ignore Mc status write enable */
8f1589d9 2125 if (data != 0) {
a737f256
CD		 2126 vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
2127 data);
8f1589d9
AP		 2128 return 1;
2129 }
15c4a640 2130 break;
f7c6d140
AP		 2131 case MSR_FAM10H_MMIO_CONF_BASE:
2132 if (data != 0) {
a737f256
CD		 2133 vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
2134 "0x%llx\n", data);
f7c6d140
AP		 2135 return 1;
2136 }
15c4a640 2137 break;
b5e2fec0
AG		 2138 case MSR_IA32_DEBUGCTLMSR:
2139 if (!data) {
2140 /* We support the non-activated case already */
2141 break;
2142 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
2143 /* Values other than LBR and BTF are vendor-specific,
2144 thus reserved and should throw a #GP */
2145 return 1;
2146 }
a737f256
CD		 2147 vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
2148 __func__, data);
b5e2fec0 2149 break;
9ba075a6
AK		 2150 case 0x200 ... 0x2ff:
2151 return set_msr_mtrr(vcpu, msr, data);
15c4a640 2152 case MSR_IA32_APICBASE:
58cb628d 2153 return kvm_set_apic_base(vcpu, msr_info);
0105d1a5
GN		 2154 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
2155 return kvm_x2apic_msr_write(vcpu, msr, data);
a3e06bbe
LJ		 2156 case MSR_IA32_TSCDEADLINE:
2157 kvm_set_lapic_tscdeadline_msr(vcpu, data);
2158 break;
ba904635
WA		 2159 case MSR_IA32_TSC_ADJUST:
2160 if (guest_cpuid_has_tsc_adjust(vcpu)) {
2161 if (!msr_info->host_initiated) {
d913b904 2162 s64 adj = data - vcpu->arch.ia32_tsc_adjust_msr;
ba904635
WA		 2163 kvm_x86_ops->adjust_tsc_offset(vcpu, adj, true);
2164 }
2165 vcpu->arch.ia32_tsc_adjust_msr = data;
2166 }
2167 break;
15c4a640 2168 case MSR_IA32_MISC_ENABLE:
ad312c7c 2169 vcpu->arch.ia32_misc_enable_msr = data;
15c4a640 2170 break;
11c6bffa 2171 case MSR_KVM_WALL_CLOCK_NEW:
18068523
GOC		 2172 case MSR_KVM_WALL_CLOCK:
2173 vcpu->kvm->arch.wall_clock = data;
2174 kvm_write_wall_clock(vcpu->kvm, data);
2175 break;
11c6bffa 2176 case MSR_KVM_SYSTEM_TIME_NEW:
18068523 2177 case MSR_KVM_SYSTEM_TIME: {
0b79459b 2178 u64 gpa_offset;
54750f2c
MT		 2179 struct kvm_arch *ka = &vcpu->kvm->arch;
2180
12f9a48f 2181 kvmclock_reset(vcpu);
18068523 2182
54750f2c
MT		 2183 if (vcpu->vcpu_id == 0 && !msr_info->host_initiated) {
2184 bool tmp = (msr == MSR_KVM_SYSTEM_TIME);
2185
2186 if (ka->boot_vcpu_runs_old_kvmclock != tmp)
2187 set_bit(KVM_REQ_MASTERCLOCK_UPDATE,
2188 &vcpu->requests);
2189
2190 ka->boot_vcpu_runs_old_kvmclock = tmp;
2191 }
2192
18068523 2193 vcpu->arch.time = data;
0061d53d 2194 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
18068523
GOC		 2195
2196 /* we verify if the enable bit is set... */
2197 if (!(data & 1))
2198 break;
2199
0b79459b 2200 gpa_offset = data & ~(PAGE_MASK | 1);
18068523 2201
0b79459b 2202 if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
8f964525
AH		 2203 &vcpu->arch.pv_time, data & ~1ULL,
2204 sizeof(struct pvclock_vcpu_time_info)))
0b79459b
AH		 2205 vcpu->arch.pv_time_enabled = false;
2206 else
2207 vcpu->arch.pv_time_enabled = true;
32cad84f 2208
18068523
GOC		 2209 break;
2210 }
344d9588
GN		 2211 case MSR_KVM_ASYNC_PF_EN:
2212 if (kvm_pv_enable_async_pf(vcpu, data))
2213 return 1;
2214 break;
c9aaa895
GC		 2215 case MSR_KVM_STEAL_TIME:
2216
2217 if (unlikely(!sched_info_on()))
2218 return 1;
2219
2220 if (data & KVM_STEAL_RESERVED_MASK)
2221 return 1;
2222
2223 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
8f964525
AH		 2224 data & KVM_STEAL_VALID_BITS,
2225 sizeof(struct kvm_steal_time)))
c9aaa895
GC		 2226 return 1;
2227
2228 vcpu->arch.st.msr_val = data;
2229
2230 if (!(data & KVM_MSR_ENABLED))
2231 break;
2232
2233 vcpu->arch.st.last_steal = current->sched_info.run_delay;
2234
2235 preempt_disable();
2236 accumulate_steal_time(vcpu);
2237 preempt_enable();
2238
2239 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
2240
2241 break;
ae7a2a3f
MT		 2242 case MSR_KVM_PV_EOI_EN:
2243 if (kvm_lapic_enable_pv_eoi(vcpu, data))
2244 return 1;
2245 break;
c9aaa895 2246
890ca9ae
HY		 2247 case MSR_IA32_MCG_CTL:
2248 case MSR_IA32_MCG_STATUS:
81760dcc 2249 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
890ca9ae 2250 return set_msr_mce(vcpu, msr, data);
71db6023
AP		 2251
2252 /* Performance counters are not protected by a CPUID bit,
2253 * so we should check all of them in the generic path for the sake of
2254 * cross vendor migration.
2255 * Writing a zero into the event select MSRs disables them,
2256 * which we perfectly emulate ;-). Any other value should be at least
2257 * reported, some guests depend on them.
2258 */
71db6023
AP		 2259 case MSR_K7_EVNTSEL0:
2260 case MSR_K7_EVNTSEL1:
2261 case MSR_K7_EVNTSEL2:
2262 case MSR_K7_EVNTSEL3:
2263 if (data != 0)
a737f256
CD		 2264 vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
2265 "0x%x data 0x%llx\n", msr, data);
71db6023
AP		 2266 break;
2267 /* at least RHEL 4 unconditionally writes to the perfctr registers,
2268 * so we ignore writes to make it happy.
2269 */
71db6023
AP		 2270 case MSR_K7_PERFCTR0:
2271 case MSR_K7_PERFCTR1:
2272 case MSR_K7_PERFCTR2:
2273 case MSR_K7_PERFCTR3:
a737f256
CD		 2274 vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
2275 "0x%x data 0x%llx\n", msr, data);
71db6023 2276 break;
5753785f
GN		 2277 case MSR_P6_PERFCTR0:
2278 case MSR_P6_PERFCTR1:
2279 pr = true;
2280 case MSR_P6_EVNTSEL0:
2281 case MSR_P6_EVNTSEL1:
2282 if (kvm_pmu_msr(vcpu, msr))
afd80d85 2283 return kvm_pmu_set_msr(vcpu, msr_info);
5753785f
GN		 2284
2285 if (pr || data != 0)
a737f256
CD		 2286 vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
2287 "0x%x data 0x%llx\n", msr, data);
5753785f 2288 break;
84e0cefa
JS		 2289 case MSR_K7_CLK_CTL:
2290 /*
2291 * Ignore all writes to this no longer documented MSR.
2292 * Writes are only relevant for old K7 processors,
2293 * all pre-dating SVM, but a recommended workaround from
4a969980 2294 * AMD for these chips. It is possible to specify the
84e0cefa
JS		 2295 * affected processor models on the command line, hence
2296 * the need to ignore the workaround.
2297 */
2298 break;
55cd8e5a
GN		 2299 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
2300 if (kvm_hv_msr_partition_wide(msr)) {
2301 int r;
2302 mutex_lock(&vcpu->kvm->lock);
2303 r = set_msr_hyperv_pw(vcpu, msr, data);
2304 mutex_unlock(&vcpu->kvm->lock);
2305 return r;
2306 } else
2307 return set_msr_hyperv(vcpu, msr, data);
2308 break;
91c9c3ed 2309 case MSR_IA32_BBL_CR_CTL3:
2310 /* Drop writes to this legacy MSR -- see rdmsr
2311 * counterpart for further detail.
2312 */
a737f256 2313 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
91c9c3ed 2314 break;
2b036c6b
BO		 2315 case MSR_AMD64_OSVW_ID_LENGTH:
2316 if (!guest_cpuid_has_osvw(vcpu))
2317 return 1;
2318 vcpu->arch.osvw.length = data;
2319 break;
2320 case MSR_AMD64_OSVW_STATUS:
2321 if (!guest_cpuid_has_osvw(vcpu))
2322 return 1;
2323 vcpu->arch.osvw.status = data;
2324 break;
15c4a640 2325 default:
ffde22ac
ES		 2326 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
2327 return xen_hvm_config(vcpu, data);
f5132b01 2328 if (kvm_pmu_msr(vcpu, msr))
afd80d85 2329 return kvm_pmu_set_msr(vcpu, msr_info);
ed85c068 2330 if (!ignore_msrs) {
a737f256
CD		 2331 vcpu_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
2332 msr, data);
ed85c068
AP		 2333 return 1;
2334 } else {
a737f256
CD		 2335 vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
2336 msr, data);
ed85c068
AP		 2337 break;
2338 }
15c4a640
CO		 2339 }
2340 return 0;
2341}
2342EXPORT_SYMBOL_GPL(kvm_set_msr_common);
2343
2344
2345/*
2346 * Reads an msr value (of 'msr_index') into 'pdata'.
2347 * Returns 0 on success, non-0 otherwise.
2348 * Assumes vcpu_load() was already called.
2349 */
2350int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
2351{
2352 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
2353}
ff651cb6 2354EXPORT_SYMBOL_GPL(kvm_get_msr);
15c4a640 2355
9ba075a6
AK		 2356static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
2357{
0bed3b56
SY		 2358 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
2359
9ba075a6
AK		 2360 if (!msr_mtrr_valid(msr))
2361 return 1;
2362
0bed3b56
SY		 2363 if (msr == MSR_MTRRdefType)
2364 *pdata = vcpu->arch.mtrr_state.def_type +
2365 (vcpu->arch.mtrr_state.enabled << 10);
2366 else if (msr == MSR_MTRRfix64K_00000)
2367 *pdata = p[0];
2368 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
2369 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
2370 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
2371 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
2372 else if (msr == MSR_IA32_CR_PAT)
2373 *pdata = vcpu->arch.pat;
2374 else { /* Variable MTRRs */
2375 int idx, is_mtrr_mask;
2376 u64 *pt;
2377
2378 idx = (msr - 0x200) / 2;
2379 is_mtrr_mask = msr - 0x200 - 2 * idx;
2380 if (!is_mtrr_mask)
2381 pt =
2382 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
2383 else
2384 pt =
2385 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
2386 *pdata = *pt;
2387 }
2388
9ba075a6
AK		 2389 return 0;
2390}
2391
890ca9ae 2392static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
15c4a640
CO		 2393{
2394 u64 data;
890ca9ae
HY		 2395 u64 mcg_cap = vcpu->arch.mcg_cap;
2396 unsigned bank_num = mcg_cap & 0xff;
15c4a640
CO		 2397
2398 switch (msr) {
15c4a640
CO		 2399 case MSR_IA32_P5_MC_ADDR:
2400 case MSR_IA32_P5_MC_TYPE:
890ca9ae
HY		 2401 data = 0;
2402 break;
15c4a640 2403 case MSR_IA32_MCG_CAP:
890ca9ae
HY		 2404 data = vcpu->arch.mcg_cap;
2405 break;
c7ac679c 2406 case MSR_IA32_MCG_CTL:
890ca9ae
HY		 2407 if (!(mcg_cap & MCG_CTL_P))
2408 return 1;
2409 data = vcpu->arch.mcg_ctl;
2410 break;
2411 case MSR_IA32_MCG_STATUS:
2412 data = vcpu->arch.mcg_status;
2413 break;
2414 default:
2415 if (msr >= MSR_IA32_MC0_CTL &&
81760dcc 2416 msr < MSR_IA32_MCx_CTL(bank_num)) {
890ca9ae
HY		 2417 u32 offset = msr - MSR_IA32_MC0_CTL;
2418 data = vcpu->arch.mce_banks[offset];
2419 break;
2420 }
2421 return 1;
2422 }
2423 *pdata = data;
2424 return 0;
2425}
2426
55cd8e5a
GN		 2427static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
2428{
2429 u64 data = 0;
2430 struct kvm *kvm = vcpu->kvm;
2431
2432 switch (msr) {
2433 case HV_X64_MSR_GUEST_OS_ID:
2434 data = kvm->arch.hv_guest_os_id;
2435 break;
2436 case HV_X64_MSR_HYPERCALL:
2437 data = kvm->arch.hv_hypercall;
2438 break;
e984097b
VR		 2439 case HV_X64_MSR_TIME_REF_COUNT: {
2440 data =
2441 div_u64(get_kernel_ns() + kvm->arch.kvmclock_offset, 100);
2442 break;
2443 }
2444 case HV_X64_MSR_REFERENCE_TSC:
2445 data = kvm->arch.hv_tsc_page;
2446 break;
55cd8e5a 2447 default:
a737f256 2448 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
55cd8e5a
GN		 2449 return 1;
2450 }
2451
2452 *pdata = data;
2453 return 0;
2454}
2455
2456static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
2457{
2458 u64 data = 0;
2459
2460 switch (msr) {
2461 case HV_X64_MSR_VP_INDEX: {
2462 int r;
2463 struct kvm_vcpu *v;
684851a1
TY		 2464 kvm_for_each_vcpu(r, v, vcpu->kvm) {
2465 if (v == vcpu) {
55cd8e5a 2466 data = r;
684851a1
TY		 2467 break;
2468 }
2469 }
55cd8e5a
GN		 2470 break;
2471 }
10388a07
GN		 2472 case HV_X64_MSR_EOI:
2473 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
2474 case HV_X64_MSR_ICR:
2475 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
2476 case HV_X64_MSR_TPR:
2477 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
14fa67ee 2478 case HV_X64_MSR_APIC_ASSIST_PAGE:
d1613ad5
MW		 2479 data = vcpu->arch.hv_vapic;
2480 break;
55cd8e5a 2481 default:
a737f256 2482 vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
55cd8e5a
GN		 2483 return 1;
2484 }
2485 *pdata = data;
2486 return 0;
2487}
2488
890ca9ae
HY		 2489int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
2490{
2491 u64 data;
2492
2493 switch (msr) {
890ca9ae 2494 case MSR_IA32_PLATFORM_ID:
15c4a640 2495 case MSR_IA32_EBL_CR_POWERON:
b5e2fec0
AG		 2496 case MSR_IA32_DEBUGCTLMSR:
2497 case MSR_IA32_LASTBRANCHFROMIP:
2498 case MSR_IA32_LASTBRANCHTOIP:
2499 case MSR_IA32_LASTINTFROMIP:
2500 case MSR_IA32_LASTINTTOIP:
60af2ecd
JSR		 2501 case MSR_K8_SYSCFG:
2502 case MSR_K7_HWCR:
61a6bd67 2503 case MSR_VM_HSAVE_PA:
9e699624 2504 case MSR_K7_EVNTSEL0:
dc9b2d93
WH		 2505 case MSR_K7_EVNTSEL1:
2506 case MSR_K7_EVNTSEL2:
2507 case MSR_K7_EVNTSEL3:
1f3ee616 2508 case MSR_K7_PERFCTR0:
dc9b2d93
WH		 2509 case MSR_K7_PERFCTR1:
2510 case MSR_K7_PERFCTR2:
2511 case MSR_K7_PERFCTR3:
1fdbd48c 2512 case MSR_K8_INT_PENDING_MSG:
c323c0e5 2513 case MSR_AMD64_NB_CFG:
f7c6d140 2514 case MSR_FAM10H_MMIO_CONF_BASE:
2e32b719 2515 case MSR_AMD64_BU_CFG2:
15c4a640
CO		 2516 data = 0;
2517 break;
5753785f
GN		 2518 case MSR_P6_PERFCTR0:
2519 case MSR_P6_PERFCTR1:
2520 case MSR_P6_EVNTSEL0:
2521 case MSR_P6_EVNTSEL1:
2522 if (kvm_pmu_msr(vcpu, msr))
2523 return kvm_pmu_get_msr(vcpu, msr, pdata);
2524 data = 0;
2525 break;
742bc670
MT		 2526 case MSR_IA32_UCODE_REV:
2527 data = 0x100000000ULL;
2528 break;
9ba075a6
AK		 2529 case MSR_MTRRcap:
2530 data = 0x500 | KVM_NR_VAR_MTRR;
2531 break;
2532 case 0x200 ... 0x2ff:
2533 return get_msr_mtrr(vcpu, msr, pdata);
15c4a640
CO		 2534 case 0xcd: /* fsb frequency */
2535 data = 3;
2536 break;
7b914098
JS		 2537 /*
2538 * MSR_EBC_FREQUENCY_ID
2539 * Conservative value valid for even the basic CPU models.
2540 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
2541 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
2542 * and 266MHz for model 3, or 4. Set Core Clock
2543 * Frequency to System Bus Frequency Ratio to 1 (bits
2544 * 31:24) even though these are only valid for CPU
2545 * models > 2, however guests may end up dividing or
2546 * multiplying by zero otherwise.
2547 */
2548 case MSR_EBC_FREQUENCY_ID:
2549 data = 1 << 24;
2550 break;
15c4a640
CO		 2551 case MSR_IA32_APICBASE:
2552 data = kvm_get_apic_base(vcpu);
2553 break;
0105d1a5
GN		 2554 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
2555 return kvm_x2apic_msr_read(vcpu, msr, pdata);
2556 break;
a3e06bbe
LJ		 2557 case MSR_IA32_TSCDEADLINE:
2558 data = kvm_get_lapic_tscdeadline_msr(vcpu);
2559 break;
ba904635
WA		 2560 case MSR_IA32_TSC_ADJUST:
2561 data = (u64)vcpu->arch.ia32_tsc_adjust_msr;
2562 break;
15c4a640 2563 case MSR_IA32_MISC_ENABLE:
ad312c7c 2564 data = vcpu->arch.ia32_misc_enable_msr;
15c4a640 2565 break;
847f0ad8
AG		 2566 case MSR_IA32_PERF_STATUS:
2567 /* TSC increment by tick */
2568 data = 1000ULL;
2569 /* CPU multiplier */
2570 data |= (((uint64_t)4ULL) << 40);
2571 break;
15c4a640 2572 case MSR_EFER:
f6801dff 2573 data = vcpu->arch.efer;
15c4a640 2574 break;
18068523 2575 case MSR_KVM_WALL_CLOCK:
11c6bffa 2576 case MSR_KVM_WALL_CLOCK_NEW:
18068523
GOC		 2577 data = vcpu->kvm->arch.wall_clock;
2578 break;
2579 case MSR_KVM_SYSTEM_TIME:
11c6bffa 2580 case MSR_KVM_SYSTEM_TIME_NEW:
18068523
GOC		 2581 data = vcpu->arch.time;
2582 break;
344d9588
GN		 2583 case MSR_KVM_ASYNC_PF_EN:
2584 data = vcpu->arch.apf.msr_val;
2585 break;
c9aaa895
GC		 2586 case MSR_KVM_STEAL_TIME:
2587 data = vcpu->arch.st.msr_val;
2588 break;
1d92128f
MT		 2589 case MSR_KVM_PV_EOI_EN:
2590 data = vcpu->arch.pv_eoi.msr_val;
2591 break;
890ca9ae
HY		 2592 case MSR_IA32_P5_MC_ADDR:
2593 case MSR_IA32_P5_MC_TYPE:
2594 case MSR_IA32_MCG_CAP:
2595 case MSR_IA32_MCG_CTL:
2596 case MSR_IA32_MCG_STATUS:
81760dcc 2597 case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1:
890ca9ae 2598 return get_msr_mce(vcpu, msr, pdata);
84e0cefa
JS		 2599 case MSR_K7_CLK_CTL:
2600 /*
2601 * Provide expected ramp-up count for K7. All other
2602 * are set to zero, indicating minimum divisors for
2603 * every field.
2604 *
2605 * This prevents guest kernels on AMD host with CPU
2606 * type 6, model 8 and higher from exploding due to
2607 * the rdmsr failing.
2608 */
2609 data = 0x20000000;
2610 break;
55cd8e5a
GN		 2611 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
2612 if (kvm_hv_msr_partition_wide(msr)) {
2613 int r;
2614 mutex_lock(&vcpu->kvm->lock);
2615 r = get_msr_hyperv_pw(vcpu, msr, pdata);
2616 mutex_unlock(&vcpu->kvm->lock);
2617 return r;
2618 } else
2619 return get_msr_hyperv(vcpu, msr, pdata);
2620 break;
91c9c3ed 2621 case MSR_IA32_BBL_CR_CTL3:
2622 /* This legacy MSR exists but isn't fully documented in current
2623 * silicon. It is however accessed by winxp in very narrow
2624 * scenarios where it sets bit #19, itself documented as
2625 * a "reserved" bit. Best effort attempt to source coherent
2626 * read data here should the balance of the register be
2627 * interpreted by the guest:
2628 *
2629 * L2 cache control register 3: 64GB range, 256KB size,
2630 * enabled, latency 0x1, configured
2631 */
2632 data = 0xbe702111;
2633 break;
2b036c6b
BO		 2634 case MSR_AMD64_OSVW_ID_LENGTH:
2635 if (!guest_cpuid_has_osvw(vcpu))
2636 return 1;
2637 data = vcpu->arch.osvw.length;
2638 break;
2639 case MSR_AMD64_OSVW_STATUS:
2640 if (!guest_cpuid_has_osvw(vcpu))
2641 return 1;
2642 data = vcpu->arch.osvw.status;
2643 break;
15c4a640 2644 default:
f5132b01
GN		 2645 if (kvm_pmu_msr(vcpu, msr))
2646 return kvm_pmu_get_msr(vcpu, msr, pdata);
ed85c068 2647 if (!ignore_msrs) {
a737f256 2648 vcpu_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
ed85c068
AP		 2649 return 1;
2650 } else {
a737f256 2651 vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
ed85c068
AP		 2652 data = 0;
2653 }
2654 break;
15c4a640
CO		 2655 }
2656 *pdata = data;
2657 return 0;
2658}
2659EXPORT_SYMBOL_GPL(kvm_get_msr_common);
2660
313a3dc7
CO		 2661/*
2662 * Read or write a bunch of msrs. All parameters are kernel addresses.
2663 *
2664 * @return number of msrs set successfully.
2665 */
2666static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
2667 struct kvm_msr_entry *entries,
2668 int (*do_msr)(struct kvm_vcpu *vcpu,
2669 unsigned index, u64 *data))
2670{
f656ce01 2671 int i, idx;
313a3dc7 2672
f656ce01 2673 idx = srcu_read_lock(&vcpu->kvm->srcu);
313a3dc7
CO		 2674 for (i = 0; i < msrs->nmsrs; ++i)
2675 if (do_msr(vcpu, entries[i].index, &entries[i].data))
2676 break;
f656ce01 2677 srcu_read_unlock(&vcpu->kvm->srcu, idx);
313a3dc7 2678
313a3dc7
CO		 2679 return i;
2680}
2681
2682/*
2683 * Read or write a bunch of msrs. Parameters are user addresses.
2684 *
2685 * @return number of msrs set successfully.
2686 */
2687static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
2688 int (*do_msr)(struct kvm_vcpu *vcpu,
2689 unsigned index, u64 *data),
2690 int writeback)
2691{
2692 struct kvm_msrs msrs;
2693 struct kvm_msr_entry *entries;
2694 int r, n;
2695 unsigned size;
2696
2697 r = -EFAULT;
2698 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
2699 goto out;
2700
2701 r = -E2BIG;
2702 if (msrs.nmsrs >= MAX_IO_MSRS)
2703 goto out;
2704
313a3dc7 2705 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
ff5c2c03
SL		 2706 entries = memdup_user(user_msrs->entries, size);
2707 if (IS_ERR(entries)) {
2708 r = PTR_ERR(entries);
313a3dc7 2709 goto out;
ff5c2c03 2710 }
313a3dc7
CO		 2711
2712 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
2713 if (r < 0)
2714 goto out_free;
2715
2716 r = -EFAULT;
2717 if (writeback && copy_to_user(user_msrs->entries, entries, size))
2718 goto out_free;
2719
2720 r = n;
2721
2722out_free:
7a73c028 2723 kfree(entries);
313a3dc7
CO		 2724out:
2725 return r;
2726}
2727
784aa3d7 2728int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
018d00d2
ZX		 2729{
2730 int r;
2731
2732 switch (ext) {
2733 case KVM_CAP_IRQCHIP:
2734 case KVM_CAP_HLT:
2735 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
018d00d2 2736 case KVM_CAP_SET_TSS_ADDR:
07716717 2737 case KVM_CAP_EXT_CPUID:
9c15bb1d 2738 case KVM_CAP_EXT_EMUL_CPUID:
c8076604 2739 case KVM_CAP_CLOCKSOURCE:
7837699f 2740 case KVM_CAP_PIT:
a28e4f5a 2741 case KVM_CAP_NOP_IO_DELAY:
62d9f0db 2742 case KVM_CAP_MP_STATE:
ed848624 2743 case KVM_CAP_SYNC_MMU:
a355c85c 2744 case KVM_CAP_USER_NMI:
52d939a0 2745 case KVM_CAP_REINJECT_CONTROL:
4925663a 2746 case KVM_CAP_IRQ_INJECT_STATUS:
721eecbf 2747 case KVM_CAP_IRQFD:
d34e6b17 2748 case KVM_CAP_IOEVENTFD:
f848a5a8 2749 case KVM_CAP_IOEVENTFD_NO_LENGTH:
c5ff41ce 2750 case KVM_CAP_PIT2:
e9f42757 2751 case KVM_CAP_PIT_STATE2:
b927a3ce 2752 case KVM_CAP_SET_IDENTITY_MAP_ADDR:
ffde22ac 2753 case KVM_CAP_XEN_HVM:
afbcf7ab 2754 case KVM_CAP_ADJUST_CLOCK:
3cfc3092 2755 case KVM_CAP_VCPU_EVENTS:
55cd8e5a 2756 case KVM_CAP_HYPERV:
10388a07 2757 case KVM_CAP_HYPERV_VAPIC:
c25bc163 2758 case KVM_CAP_HYPERV_SPIN:
ab9f4ecb 2759 case KVM_CAP_PCI_SEGMENT:
a1efbe77 2760 case KVM_CAP_DEBUGREGS:
d2be1651 2761 case KVM_CAP_X86_ROBUST_SINGLESTEP:
2d5b5a66 2762 case KVM_CAP_XSAVE:
344d9588 2763 case KVM_CAP_ASYNC_PF:
92a1f12d 2764 case KVM_CAP_GET_TSC_KHZ:
1c0b28c2 2765 case KVM_CAP_KVMCLOCK_CTRL:
4d8b81ab 2766 case KVM_CAP_READONLY_MEM:
5f66b620 2767 case KVM_CAP_HYPERV_TIME:
100943c5 2768 case KVM_CAP_IOAPIC_POLARITY_IGNORED:
defcf51f 2769 case KVM_CAP_TSC_DEADLINE_TIMER:
2a5bab10
AW		 2770#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
2771 case KVM_CAP_ASSIGN_DEV_IRQ:
2772 case KVM_CAP_PCI_2_3:
2773#endif
018d00d2
ZX		 2774 r = 1;
2775 break;
542472b5
LV		 2776 case KVM_CAP_COALESCED_MMIO:
2777 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
2778 break;
774ead3a
AK		 2779 case KVM_CAP_VAPIC:
2780 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2781 break;
f725230a 2782 case KVM_CAP_NR_VCPUS:
8c3ba334
SL		 2783 r = KVM_SOFT_MAX_VCPUS;
2784 break;
2785 case KVM_CAP_MAX_VCPUS:
f725230a
AK		 2786 r = KVM_MAX_VCPUS;
2787 break;
a988b910 2788 case KVM_CAP_NR_MEMSLOTS:
bbacc0c1 2789 r = KVM_USER_MEM_SLOTS;
a988b910 2790 break;
a68a6a72
MT		 2791 case KVM_CAP_PV_MMU: /* obsolete */
2792 r = 0;
2f333bcb 2793 break;
4cee4b72 2794#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
62c476c7 2795 case KVM_CAP_IOMMU:
a1b60c1c 2796 r = iommu_present(&pci_bus_type);
62c476c7 2797 break;
4cee4b72 2798#endif
890ca9ae
HY		 2799 case KVM_CAP_MCE:
2800 r = KVM_MAX_MCE_BANKS;
2801 break;
2d5b5a66
SY		 2802 case KVM_CAP_XCRS:
2803 r = cpu_has_xsave;
2804 break;
92a1f12d
JR		 2805 case KVM_CAP_TSC_CONTROL:
2806 r = kvm_has_tsc_control;
2807 break;
018d00d2
ZX		 2808 default:
2809 r = 0;
2810 break;
2811 }
2812 return r;
2813
2814}
2815
043405e1
CO		 2816long kvm_arch_dev_ioctl(struct file *filp,
2817 unsigned int ioctl, unsigned long arg)
2818{
2819 void __user *argp = (void __user *)arg;
2820 long r;
2821
2822 switch (ioctl) {
2823 case KVM_GET_MSR_INDEX_LIST: {
2824 struct kvm_msr_list __user *user_msr_list = argp;
2825 struct kvm_msr_list msr_list;
2826 unsigned n;
2827
2828 r = -EFAULT;
2829 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2830 goto out;
2831 n = msr_list.nmsrs;
2832 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2833 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2834 goto out;
2835 r = -E2BIG;
e125e7b6 2836 if (n < msr_list.nmsrs)
043405e1
CO		 2837 goto out;
2838 r = -EFAULT;
2839 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2840 num_msrs_to_save * sizeof(u32)))
2841 goto out;
e125e7b6 2842 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
043405e1
CO		 2843 &emulated_msrs,
2844 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2845 goto out;
2846 r = 0;
2847 break;
2848 }
9c15bb1d
BP		 2849 case KVM_GET_SUPPORTED_CPUID:
2850 case KVM_GET_EMULATED_CPUID: {
674eea0f
AK		 2851 struct kvm_cpuid2 __user *cpuid_arg = argp;
2852 struct kvm_cpuid2 cpuid;
2853
2854 r = -EFAULT;
2855 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2856 goto out;
9c15bb1d
BP		 2857
2858 r = kvm_dev_ioctl_get_cpuid(&cpuid, cpuid_arg->entries,
2859 ioctl);
674eea0f
AK		 2860 if (r)
2861 goto out;
2862
2863 r = -EFAULT;
2864 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2865 goto out;
2866 r = 0;
2867 break;
2868 }
890ca9ae
HY		 2869 case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2870 u64 mce_cap;
2871
2872 mce_cap = KVM_MCE_CAP_SUPPORTED;
2873 r = -EFAULT;
2874 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2875 goto out;
2876 r = 0;
2877 break;
2878 }
043405e1
CO		 2879 default:
2880 r = -EINVAL;
2881 }
2882out:
2883 return r;
2884}
2885
f5f48ee1
SY		 2886static void wbinvd_ipi(void *garbage)
2887{
2888 wbinvd();
2889}
2890
2891static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2892{
e0f0bbc5 2893 return kvm_arch_has_noncoherent_dma(vcpu->kvm);
f5f48ee1
SY		 2894}
2895
313a3dc7
CO		 2896void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2897{
f5f48ee1
SY		 2898 /* Address WBINVD may be executed by guest */
2899 if (need_emulate_wbinvd(vcpu)) {
2900 if (kvm_x86_ops->has_wbinvd_exit())
2901 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2902 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2903 smp_call_function_single(vcpu->cpu,
2904 wbinvd_ipi, NULL, 1);
2905 }
2906
313a3dc7 2907 kvm_x86_ops->vcpu_load(vcpu, cpu);
8f6055cb 2908
0dd6a6ed
ZA		 2909 /* Apply any externally detected TSC adjustments (due to suspend) */
2910 if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
2911 adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
2912 vcpu->arch.tsc_offset_adjustment = 0;
105b21bb 2913 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
0dd6a6ed 2914 }
8f6055cb 2915
48434c20 2916 if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
6f526ec5
ZA		 2917 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
2918 native_read_tsc() - vcpu->arch.last_host_tsc;
e48672fa
ZA		 2919 if (tsc_delta < 0)
2920 mark_tsc_unstable("KVM discovered backwards TSC");
c285545f 2921 if (check_tsc_unstable()) {
b183aa58
ZA		 2922 u64 offset = kvm_x86_ops->compute_tsc_offset(vcpu,
2923 vcpu->arch.last_guest_tsc);
2924 kvm_x86_ops->write_tsc_offset(vcpu, offset);
c285545f 2925 vcpu->arch.tsc_catchup = 1;
c285545f 2926 }
d98d07ca
MT		 2927 /*
2928 * On a host with synchronized TSC, there is no need to update
2929 * kvmclock on vcpu->cpu migration
2930 */
2931 if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1)
0061d53d 2932 kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
c285545f
ZA		 2933 if (vcpu->cpu != cpu)
2934 kvm_migrate_timers(vcpu);
e48672fa 2935 vcpu->cpu = cpu;
6b7d7e76 2936 }
c9aaa895
GC		 2937
2938 accumulate_steal_time(vcpu);
2939 kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
313a3dc7
CO		 2940}
2941
2942void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2943{
02daab21 2944 kvm_x86_ops->vcpu_put(vcpu);
1c11e713 2945 kvm_put_guest_fpu(vcpu);
6f526ec5 2946 vcpu->arch.last_host_tsc = native_read_tsc();
313a3dc7
CO		 2947}
2948
313a3dc7
CO		 2949static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2950 struct kvm_lapic_state *s)
2951{
5a71785d 2952 kvm_x86_ops->sync_pir_to_irr(vcpu);
ad312c7c 2953 memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
313a3dc7
CO		 2954
2955 return 0;
2956}
2957
2958static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2959 struct kvm_lapic_state *s)
2960{
64eb0620 2961 kvm_apic_post_state_restore(vcpu, s);
cb142eb7 2962 update_cr8_intercept(vcpu);
313a3dc7
CO		 2963
2964 return 0;
2965}
2966
f77bc6a4
ZX		 2967static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2968 struct kvm_interrupt *irq)
2969{
02cdb50f 2970 if (irq->irq >= KVM_NR_INTERRUPTS)
f77bc6a4
ZX		 2971 return -EINVAL;
2972 if (irqchip_in_kernel(vcpu->kvm))
2973 return -ENXIO;
f77bc6a4 2974
66fd3f7f 2975 kvm_queue_interrupt(vcpu, irq->irq, false);
3842d135 2976 kvm_make_request(KVM_REQ_EVENT, vcpu);
f77bc6a4 2977
f77bc6a4
ZX		 2978 return 0;
2979}
2980
c4abb7c9
JK		 2981static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2982{
c4abb7c9 2983 kvm_inject_nmi(vcpu);
c4abb7c9
JK		 2984
2985 return 0;
2986}
2987
b209749f
AK		 2988static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2989 struct kvm_tpr_access_ctl *tac)
2990{
2991 if (tac->flags)
2992 return -EINVAL;
2993 vcpu->arch.tpr_access_reporting = !!tac->enabled;
2994 return 0;
2995}
2996
890ca9ae
HY		 2997static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2998 u64 mcg_cap)
2999{
3000 int r;
3001 unsigned bank_num = mcg_cap & 0xff, bank;
3002
3003 r = -EINVAL;
a9e38c3e 3004 if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
890ca9ae
HY		 3005 goto out;
3006 if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
3007 goto out;
3008 r = 0;
3009 vcpu->arch.mcg_cap = mcg_cap;
3010 /* Init IA32_MCG_CTL to all 1s */
3011 if (mcg_cap & MCG_CTL_P)
3012 vcpu->arch.mcg_ctl = ~(u64)0;
3013 /* Init IA32_MCi_CTL to all 1s */
3014 for (bank = 0; bank < bank_num; bank++)
3015 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
3016out:
3017 return r;
3018}
3019
3020static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
3021 struct kvm_x86_mce *mce)
3022{
3023 u64 mcg_cap = vcpu->arch.mcg_cap;
3024 unsigned bank_num = mcg_cap & 0xff;
3025 u64 *banks = vcpu->arch.mce_banks;
3026
3027 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
3028 return -EINVAL;
3029 /*
3030 * if IA32_MCG_CTL is not all 1s, the uncorrected error
3031 * reporting is disabled
3032 */
3033 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
3034 vcpu->arch.mcg_ctl != ~(u64)0)
3035 return 0;
3036 banks += 4 * mce->bank;
3037 /*
3038 * if IA32_MCi_CTL is not all 1s, the uncorrected error
3039 * reporting is disabled for the bank
3040 */
3041 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
3042 return 0;
3043 if (mce->status & MCI_STATUS_UC) {
3044 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
fc78f519 3045 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
a8eeb04a 3046 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
890ca9ae
HY		 3047 return 0;
3048 }
3049 if (banks[1] & MCI_STATUS_VAL)
3050 mce->status |= MCI_STATUS_OVER;
3051 banks[2] = mce->addr;
3052 banks[3] = mce->misc;
3053 vcpu->arch.mcg_status = mce->mcg_status;
3054 banks[1] = mce->status;
3055 kvm_queue_exception(vcpu, MC_VECTOR);
3056 } else if (!(banks[1] & MCI_STATUS_VAL)
3057 || !(banks[1] & MCI_STATUS_UC)) {
3058 if (banks[1] & MCI_STATUS_VAL)
3059 mce->status |= MCI_STATUS_OVER;
3060 banks[2] = mce->addr;
3061 banks[3] = mce->misc;
3062 banks[1] = mce->status;
3063 } else
3064 banks[1] |= MCI_STATUS_OVER;
3065 return 0;
3066}
3067
3cfc3092
JK		 3068static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
3069 struct kvm_vcpu_events *events)
3070{
7460fb4a 3071 process_nmi(vcpu);
03b82a30
JK		 3072 events->exception.injected =
3073 vcpu->arch.exception.pending &&
3074 !kvm_exception_is_soft(vcpu->arch.exception.nr);
3cfc3092
JK		 3075 events->exception.nr = vcpu->arch.exception.nr;
3076 events->exception.has_error_code = vcpu->arch.exception.has_error_code;
97e69aa6 3077 events->exception.pad = 0;
3cfc3092
JK		 3078 events->exception.error_code = vcpu->arch.exception.error_code;
3079
03b82a30
JK		 3080 events->interrupt.injected =
3081 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
3cfc3092 3082 events->interrupt.nr = vcpu->arch.interrupt.nr;
03b82a30 3083 events->interrupt.soft = 0;
37ccdcbe 3084 events->interrupt.shadow = kvm_x86_ops->get_interrupt_shadow(vcpu);
3cfc3092
JK		 3085
3086 events->nmi.injected = vcpu->arch.nmi_injected;
7460fb4a 3087 events->nmi.pending = vcpu->arch.nmi_pending != 0;
3cfc3092 3088 events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
97e69aa6 3089 events->nmi.pad = 0;
3cfc3092 3090
66450a21 3091 events->sipi_vector = 0; /* never valid when reporting to user space */
3cfc3092 3092
dab4b911 3093 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
48005f64 3094 | KVM_VCPUEVENT_VALID_SHADOW);
97e69aa6 3095 memset(&events->reserved, 0, sizeof(events->reserved));
3cfc3092
JK		 3096}
3097
3098static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
3099 struct kvm_vcpu_events *events)
3100{
dab4b911 3101 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
48005f64
JK		 3102 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
3103 | KVM_VCPUEVENT_VALID_SHADOW))
3cfc3092
JK		 3104 return -EINVAL;
3105
7460fb4a 3106 process_nmi(vcpu);
3cfc3092
JK		 3107 vcpu->arch.exception.pending = events->exception.injected;
3108 vcpu->arch.exception.nr = events->exception.nr;
3109 vcpu->arch.exception.has_error_code = events->exception.has_error_code;
3110 vcpu->arch.exception.error_code = events->exception.error_code;
3111
3112 vcpu->arch.interrupt.pending = events->interrupt.injected;
3113 vcpu->arch.interrupt.nr = events->interrupt.nr;
3114 vcpu->arch.interrupt.soft = events->interrupt.soft;
48005f64
JK		 3115 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
3116 kvm_x86_ops->set_interrupt_shadow(vcpu,
3117 events->interrupt.shadow);
3cfc3092
JK		 3118
3119 vcpu->arch.nmi_injected = events->nmi.injected;
dab4b911
JK		 3120 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
3121 vcpu->arch.nmi_pending = events->nmi.pending;
3cfc3092
JK		 3122 kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
3123
66450a21
JK		 3124 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR &&
3125 kvm_vcpu_has_lapic(vcpu))
3126 vcpu->arch.apic->sipi_vector = events->sipi_vector;
3cfc3092 3127
3842d135
AK		 3128 kvm_make_request(KVM_REQ_EVENT, vcpu);
3129
3cfc3092
JK		 3130 return 0;
3131}
3132
a1efbe77
JK		 3133static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
3134 struct kvm_debugregs *dbgregs)
3135{
73aaf249
JK		 3136 unsigned long val;
3137
a1efbe77 3138 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
16f8a6f9 3139 kvm_get_dr(vcpu, 6, &val);
73aaf249 3140 dbgregs->dr6 = val;
a1efbe77
JK		 3141 dbgregs->dr7 = vcpu->arch.dr7;
3142 dbgregs->flags = 0;
97e69aa6 3143 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
a1efbe77
JK		 3144}
3145
3146static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
3147 struct kvm_debugregs *dbgregs)
3148{
3149 if (dbgregs->flags)
3150 return -EINVAL;
3151
a1efbe77
JK		 3152 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
3153 vcpu->arch.dr6 = dbgregs->dr6;
73aaf249 3154 kvm_update_dr6(vcpu);
a1efbe77 3155 vcpu->arch.dr7 = dbgregs->dr7;
9926c9fd 3156 kvm_update_dr7(vcpu);
a1efbe77 3157
a1efbe77
JK		 3158 return 0;
3159}
3160
df1daba7
PB		 3161#define XSTATE_COMPACTION_ENABLED (1ULL << 63)
3162
3163static void fill_xsave(u8 *dest, struct kvm_vcpu *vcpu)
3164{
3165 struct xsave_struct *xsave = &vcpu->arch.guest_fpu.state->xsave;
3166 u64 xstate_bv = xsave->xsave_hdr.xstate_bv;
3167 u64 valid;
3168
3169 /*
3170 * Copy legacy XSAVE area, to avoid complications with CPUID
3171 * leaves 0 and 1 in the loop below.
3172 */
3173 memcpy(dest, xsave, XSAVE_HDR_OFFSET);
3174
3175 /* Set XSTATE_BV */
3176 *(u64 *)(dest + XSAVE_HDR_OFFSET) = xstate_bv;
3177
3178 /*
3179 * Copy each region from the possibly compacted offset to the
3180 * non-compacted offset.
3181 */
3182 valid = xstate_bv & ~XSTATE_FPSSE;
3183 while (valid) {
3184 u64 feature = valid & -valid;
3185 int index = fls64(feature) - 1;
3186 void *src = get_xsave_addr(xsave, feature);
3187
3188 if (src) {
3189 u32 size, offset, ecx, edx;
3190 cpuid_count(XSTATE_CPUID, index,
3191 &size, &offset, &ecx, &edx);
3192 memcpy(dest + offset, src, size);
3193 }
3194
3195 valid -= feature;
3196 }
3197}
3198
3199static void load_xsave(struct kvm_vcpu *vcpu, u8 *src)
3200{
3201 struct xsave_struct *xsave = &vcpu->arch.guest_fpu.state->xsave;
3202 u64 xstate_bv = *(u64 *)(src + XSAVE_HDR_OFFSET);
3203 u64 valid;
3204
3205 /*
3206 * Copy legacy XSAVE area, to avoid complications with CPUID
3207 * leaves 0 and 1 in the loop below.
3208 */
3209 memcpy(xsave, src, XSAVE_HDR_OFFSET);
3210
3211 /* Set XSTATE_BV and possibly XCOMP_BV. */
3212 xsave->xsave_hdr.xstate_bv = xstate_bv;
3213 if (cpu_has_xsaves)
3214 xsave->xsave_hdr.xcomp_bv = host_xcr0 | XSTATE_COMPACTION_ENABLED;
3215
3216 /*
3217 * Copy each region from the non-compacted offset to the
3218 * possibly compacted offset.
3219 */
3220 valid = xstate_bv & ~XSTATE_FPSSE;
3221 while (valid) {
3222 u64 feature = valid & -valid;
3223 int index = fls64(feature) - 1;
3224 void *dest = get_xsave_addr(xsave, feature);
3225
3226 if (dest) {
3227 u32 size, offset, ecx, edx;
3228 cpuid_count(XSTATE_CPUID, index,
3229 &size, &offset, &ecx, &edx);
3230 memcpy(dest, src + offset, size);
3231 } else
3232 WARN_ON_ONCE(1);
3233
3234 valid -= feature;
3235 }
3236}
3237
2d5b5a66
SY		 3238static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
3239 struct kvm_xsave *guest_xsave)
3240{
4344ee98 3241 if (cpu_has_xsave) {
df1daba7
PB		 3242 memset(guest_xsave, 0, sizeof(struct kvm_xsave));
3243 fill_xsave((u8 *) guest_xsave->region, vcpu);
4344ee98 3244 } else {
2d5b5a66
SY		 3245 memcpy(guest_xsave->region,
3246 &vcpu->arch.guest_fpu.state->fxsave,
3247 sizeof(struct i387_fxsave_struct));
3248 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
3249 XSTATE_FPSSE;
3250 }
3251}
3252
3253static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
3254 struct kvm_xsave *guest_xsave)
3255{
3256 u64 xstate_bv =
3257 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
3258
d7876f1b
PB		 3259 if (cpu_has_xsave) {
3260 /*
3261 * Here we allow setting states that are not present in
3262 * CPUID leaf 0xD, index 0, EDX:EAX. This is for compatibility
3263 * with old userspace.
3264 */
4ff41732 3265 if (xstate_bv & ~kvm_supported_xcr0())
d7876f1b 3266 return -EINVAL;
df1daba7 3267 load_xsave(vcpu, (u8 *)guest_xsave->region);
d7876f1b 3268 } else {
2d5b5a66
SY		 3269 if (xstate_bv & ~XSTATE_FPSSE)
3270 return -EINVAL;
3271 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
3272 guest_xsave->region, sizeof(struct i387_fxsave_struct));
3273 }
3274 return 0;
3275}
3276
3277static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
3278 struct kvm_xcrs *guest_xcrs)
3279{
3280 if (!cpu_has_xsave) {
3281 guest_xcrs->nr_xcrs = 0;
3282 return;
3283 }
3284
3285 guest_xcrs->nr_xcrs = 1;
3286 guest_xcrs->flags = 0;
3287 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
3288 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
3289}
3290
3291static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
3292 struct kvm_xcrs *guest_xcrs)
3293{
3294 int i, r = 0;
3295
3296 if (!cpu_has_xsave)
3297 return -EINVAL;
3298
3299 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
3300 return -EINVAL;
3301
3302 for (i = 0; i < guest_xcrs->nr_xcrs; i++)
3303 /* Only support XCR0 currently */
c67a04cb 3304 if (guest_xcrs->xcrs[i].xcr == XCR_XFEATURE_ENABLED_MASK) {
2d5b5a66 3305 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
c67a04cb 3306 guest_xcrs->xcrs[i].value);
2d5b5a66
SY		 3307 break;
3308 }
3309 if (r)
3310 r = -EINVAL;
3311 return r;
3312}
3313
1c0b28c2
EM		 3314/*
3315 * kvm_set_guest_paused() indicates to the guest kernel that it has been
3316 * stopped by the hypervisor. This function will be called from the host only.
3317 * EINVAL is returned when the host attempts to set the flag for a guest that
3318 * does not support pv clocks.
3319 */
3320static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
3321{
0b79459b 3322 if (!vcpu->arch.pv_time_enabled)
1c0b28c2 3323 return -EINVAL;
51d59c6b 3324 vcpu->arch.pvclock_set_guest_stopped_request = true;
1c0b28c2
EM		 3325 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
3326 return 0;
3327}
3328
313a3dc7
CO		 3329long kvm_arch_vcpu_ioctl(struct file *filp,
3330 unsigned int ioctl, unsigned long arg)
3331{
3332 struct kvm_vcpu *vcpu = filp->private_data;
3333 void __user *argp = (void __user *)arg;
3334 int r;
d1ac91d8
AK		 3335 union {
3336 struct kvm_lapic_state *lapic;
3337 struct kvm_xsave *xsave;
3338 struct kvm_xcrs *xcrs;
3339 void *buffer;
3340 } u;
3341
3342 u.buffer = NULL;
313a3dc7
CO		 3343 switch (ioctl) {
3344 case KVM_GET_LAPIC: {
2204ae3c
MT		 3345 r = -EINVAL;
3346 if (!vcpu->arch.apic)
3347 goto out;
d1ac91d8 3348 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
313a3dc7 3349
b772ff36 3350 r = -ENOMEM;
d1ac91d8 3351 if (!u.lapic)
b772ff36 3352 goto out;
d1ac91d8 3353 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
313a3dc7
CO		 3354 if (r)
3355 goto out;
3356 r = -EFAULT;
d1ac91d8 3357 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
313a3dc7
CO		 3358 goto out;
3359 r = 0;
3360 break;
3361 }
3362 case KVM_SET_LAPIC: {
2204ae3c
MT		 3363 r = -EINVAL;
3364 if (!vcpu->arch.apic)
3365 goto out;
ff5c2c03 3366 u.lapic = memdup_user(argp, sizeof(*u.lapic));
18595411
GC		 3367 if (IS_ERR(u.lapic))
3368 return PTR_ERR(u.lapic);
ff5c2c03 3369
d1ac91d8 3370 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
313a3dc7
CO		 3371 break;
3372 }
f77bc6a4
ZX		 3373 case KVM_INTERRUPT: {
3374 struct kvm_interrupt irq;
3375
3376 r = -EFAULT;
3377 if (copy_from_user(&irq, argp, sizeof irq))
3378 goto out;
3379 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
f77bc6a4
ZX		 3380 break;
3381 }
c4abb7c9
JK		 3382 case KVM_NMI: {
3383 r = kvm_vcpu_ioctl_nmi(vcpu);
c4abb7c9
JK		 3384 break;
3385 }
313a3dc7
CO		 3386 case KVM_SET_CPUID: {
3387 struct kvm_cpuid __user *cpuid_arg = argp;
3388 struct kvm_cpuid cpuid;
3389
3390 r = -EFAULT;
3391 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3392 goto out;
3393 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
313a3dc7
CO		 3394 break;
3395 }
07716717
DK		 3396 case KVM_SET_CPUID2: {
3397 struct kvm_cpuid2 __user *cpuid_arg = argp;
3398 struct kvm_cpuid2 cpuid;
3399
3400 r = -EFAULT;
3401 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3402 goto out;
3403 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
19355475 3404 cpuid_arg->entries);
07716717
DK		 3405 break;
3406 }
3407 case KVM_GET_CPUID2: {
3408 struct kvm_cpuid2 __user *cpuid_arg = argp;
3409 struct kvm_cpuid2 cpuid;
3410
3411 r = -EFAULT;
3412 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
3413 goto out;
3414 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
19355475 3415 cpuid_arg->entries);
07716717
DK		 3416 if (r)
3417 goto out;
3418 r = -EFAULT;
3419 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
3420 goto out;
3421 r = 0;
3422 break;
3423 }
313a3dc7
CO		 3424 case KVM_GET_MSRS:
3425 r = msr_io(vcpu, argp, kvm_get_msr, 1);
3426 break;
3427 case KVM_SET_MSRS:
3428 r = msr_io(vcpu, argp, do_set_msr, 0);
3429 break;
b209749f
AK		 3430 case KVM_TPR_ACCESS_REPORTING: {
3431 struct kvm_tpr_access_ctl tac;
3432
3433 r = -EFAULT;
3434 if (copy_from_user(&tac, argp, sizeof tac))
3435 goto out;
3436 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
3437 if (r)
3438 goto out;
3439 r = -EFAULT;
3440 if (copy_to_user(argp, &tac, sizeof tac))
3441 goto out;
3442 r = 0;
3443 break;
3444 };
b93463aa
AK		 3445 case KVM_SET_VAPIC_ADDR: {
3446 struct kvm_vapic_addr va;
3447
3448 r = -EINVAL;
3449 if (!irqchip_in_kernel(vcpu->kvm))
3450 goto out;
3451 r = -EFAULT;
3452 if (copy_from_user(&va, argp, sizeof va))
3453 goto out;
fda4e2e8 3454 r = kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
b93463aa
AK		 3455 break;
3456 }
890ca9ae
HY		 3457 case KVM_X86_SETUP_MCE: {
3458 u64 mcg_cap;
3459
3460 r = -EFAULT;
3461 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
3462 goto out;
3463 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
3464 break;
3465 }
3466 case KVM_X86_SET_MCE: {
3467 struct kvm_x86_mce mce;
3468
3469 r = -EFAULT;
3470 if (copy_from_user(&mce, argp, sizeof mce))
3471 goto out;
3472 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
3473 break;
3474 }
3cfc3092
JK		 3475 case KVM_GET_VCPU_EVENTS: {
3476 struct kvm_vcpu_events events;
3477
3478 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
3479
3480 r = -EFAULT;
3481 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
3482 break;
3483 r = 0;
3484 break;
3485 }
3486 case KVM_SET_VCPU_EVENTS: {
3487 struct kvm_vcpu_events events;
3488
3489 r = -EFAULT;
3490 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
3491 break;
3492
3493 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
3494 break;
3495 }
a1efbe77
JK		 3496 case KVM_GET_DEBUGREGS: {
3497 struct kvm_debugregs dbgregs;
3498
3499 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
3500
3501 r = -EFAULT;
3502 if (copy_to_user(argp, &dbgregs,
3503 sizeof(struct kvm_debugregs)))
3504 break;
3505 r = 0;
3506 break;
3507 }
3508 case KVM_SET_DEBUGREGS: {
3509 struct kvm_debugregs dbgregs;
3510
3511 r = -EFAULT;
3512 if (copy_from_user(&dbgregs, argp,
3513 sizeof(struct kvm_debugregs)))
3514 break;
3515
3516 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
3517 break;
3518 }
2d5b5a66 3519 case KVM_GET_XSAVE: {
d1ac91d8 3520 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2d5b5a66 3521 r = -ENOMEM;
d1ac91d8 3522 if (!u.xsave)
2d5b5a66
SY		 3523 break;
3524
d1ac91d8 3525 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
2d5b5a66
SY		 3526
3527 r = -EFAULT;
d1ac91d8 3528 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
2d5b5a66
SY		 3529 break;
3530 r = 0;
3531 break;
3532 }
3533 case KVM_SET_XSAVE: {
ff5c2c03 3534 u.xsave = memdup_user(argp, sizeof(*u.xsave));
18595411
GC		 3535 if (IS_ERR(u.xsave))
3536 return PTR_ERR(u.xsave);
2d5b5a66 3537
d1ac91d8 3538 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
2d5b5a66
SY		 3539 break;
3540 }
3541 case KVM_GET_XCRS: {
d1ac91d8 3542 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
2d5b5a66 3543 r = -ENOMEM;
d1ac91d8 3544 if (!u.xcrs)
2d5b5a66
SY		 3545 break;
3546
d1ac91d8 3547 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
2d5b5a66
SY		 3548
3549 r = -EFAULT;
d1ac91d8 3550 if (copy_to_user(argp, u.xcrs,
2d5b5a66
SY		 3551 sizeof(struct kvm_xcrs)))
3552 break;
3553 r = 0;
3554 break;
3555 }
3556 case KVM_SET_XCRS: {
ff5c2c03 3557 u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
18595411
GC		 3558 if (IS_ERR(u.xcrs))
3559 return PTR_ERR(u.xcrs);
2d5b5a66 3560
d1ac91d8 3561 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
2d5b5a66
SY		 3562 break;
3563 }
92a1f12d
JR		 3564 case KVM_SET_TSC_KHZ: {
3565 u32 user_tsc_khz;
3566
3567 r = -EINVAL;
92a1f12d
JR		 3568 user_tsc_khz = (u32)arg;
3569
3570 if (user_tsc_khz >= kvm_max_guest_tsc_khz)
3571 goto out;
3572
cc578287
ZA		 3573 if (user_tsc_khz == 0)
3574 user_tsc_khz = tsc_khz;
3575
3576 kvm_set_tsc_khz(vcpu, user_tsc_khz);
92a1f12d
JR		 3577
3578 r = 0;
3579 goto out;
3580 }
3581 case KVM_GET_TSC_KHZ: {
cc578287 3582 r = vcpu->arch.virtual_tsc_khz;
92a1f12d
JR		 3583 goto out;
3584 }
1c0b28c2
EM		 3585 case KVM_KVMCLOCK_CTRL: {
3586 r = kvm_set_guest_paused(vcpu);
3587 goto out;
3588 }
313a3dc7
CO		 3589 default:
3590 r = -EINVAL;
3591 }
3592out:
d1ac91d8 3593 kfree(u.buffer);
313a3dc7
CO		 3594 return r;
3595}
3596
5b1c1493
CO		 3597int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
3598{
3599 return VM_FAULT_SIGBUS;
3600}
3601
1fe779f8
CO		 3602static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
3603{
3604 int ret;
3605
3606 if (addr > (unsigned int)(-3 * PAGE_SIZE))
951179ce 3607 return -EINVAL;
1fe779f8
CO		 3608 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
3609 return ret;
3610}
3611
b927a3ce
SY		 3612static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
3613 u64 ident_addr)
3614{
3615 kvm->arch.ept_identity_map_addr = ident_addr;
3616 return 0;
3617}
3618
1fe779f8
CO		 3619static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
3620 u32 kvm_nr_mmu_pages)
3621{
3622 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
3623 return -EINVAL;
3624
79fac95e 3625 mutex_lock(&kvm->slots_lock);
1fe779f8
CO		 3626
3627 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
f05e70ac 3628 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1fe779f8 3629
79fac95e 3630 mutex_unlock(&kvm->slots_lock);
1fe779f8
CO		 3631 return 0;
3632}
3633
3634static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
3635{
39de71ec 3636 return kvm->arch.n_max_mmu_pages;
1fe779f8
CO		 3637}
3638
1fe779f8
CO		 3639static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3640{
3641 int r;
3642
3643 r = 0;
3644 switch (chip->chip_id) {
3645 case KVM_IRQCHIP_PIC_MASTER:
3646 memcpy(&chip->chip.pic,
3647 &pic_irqchip(kvm)->pics[0],
3648 sizeof(struct kvm_pic_state));
3649 break;
3650 case KVM_IRQCHIP_PIC_SLAVE:
3651 memcpy(&chip->chip.pic,
3652 &pic_irqchip(kvm)->pics[1],
3653 sizeof(struct kvm_pic_state));
3654 break;
3655 case KVM_IRQCHIP_IOAPIC:
eba0226b 3656 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
1fe779f8
CO		 3657 break;
3658 default:
3659 r = -EINVAL;
3660 break;
3661 }
3662 return r;
3663}
3664
3665static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3666{
3667 int r;
3668
3669 r = 0;
3670 switch (chip->chip_id) {
3671 case KVM_IRQCHIP_PIC_MASTER:
f4f51050 3672 spin_lock(&pic_irqchip(kvm)->lock);
1fe779f8
CO		 3673 memcpy(&pic_irqchip(kvm)->pics[0],
3674 &chip->chip.pic,
3675 sizeof(struct kvm_pic_state));
f4f51050 3676 spin_unlock(&pic_irqchip(kvm)->lock);
1fe779f8
CO		 3677 break;
3678 case KVM_IRQCHIP_PIC_SLAVE:
f4f51050 3679 spin_lock(&pic_irqchip(kvm)->lock);
1fe779f8
CO		 3680 memcpy(&pic_irqchip(kvm)->pics[1],
3681 &chip->chip.pic,
3682 sizeof(struct kvm_pic_state));
f4f51050 3683 spin_unlock(&pic_irqchip(kvm)->lock);
1fe779f8
CO		 3684 break;
3685 case KVM_IRQCHIP_IOAPIC:
eba0226b 3686 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
1fe779f8
CO		 3687 break;
3688 default:
3689 r = -EINVAL;
3690 break;
3691 }
3692 kvm_pic_update_irq(pic_irqchip(kvm));
3693 return r;
3694}
3695
e0f63cb9
SY		 3696static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3697{
3698 int r = 0;
3699
894a9c55 3700 mutex_lock(&kvm->arch.vpit->pit_state.lock);
e0f63cb9 3701 memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
894a9c55 3702 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
e0f63cb9
SY		 3703 return r;
3704}
3705
3706static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3707{
3708 int r = 0;
3709
894a9c55 3710 mutex_lock(&kvm->arch.vpit->pit_state.lock);
e0f63cb9 3711 memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
e9f42757
BK		 3712 kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3713 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3714 return r;
3715}
3716
3717static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3718{
3719 int r = 0;
3720
3721 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3722 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3723 sizeof(ps->channels));
3724 ps->flags = kvm->arch.vpit->pit_state.flags;
3725 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
97e69aa6 3726 memset(&ps->reserved, 0, sizeof(ps->reserved));
e9f42757
BK		 3727 return r;
3728}
3729
3730static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3731{
3732 int r = 0, start = 0;
3733 u32 prev_legacy, cur_legacy;
3734 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3735 prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3736 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3737 if (!prev_legacy && cur_legacy)
3738 start = 1;
3739 memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3740 sizeof(kvm->arch.vpit->pit_state.channels));
3741 kvm->arch.vpit->pit_state.flags = ps->flags;
3742 kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
894a9c55 3743 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
e0f63cb9
SY		 3744 return r;
3745}
3746
52d939a0
MT		 3747static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3748 struct kvm_reinject_control *control)
3749{
3750 if (!kvm->arch.vpit)
3751 return -ENXIO;
894a9c55 3752 mutex_lock(&kvm->arch.vpit->pit_state.lock);
26ef1924 3753 kvm->arch.vpit->pit_state.reinject = control->pit_reinject;
894a9c55 3754 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
52d939a0
MT		 3755 return 0;
3756}
3757
95d4c16c 3758/**
60c34612
TY		 3759 * kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
3760 * @kvm: kvm instance
3761 * @log: slot id and address to which we copy the log
95d4c16c 3762 *
e108ff2f
PB		 3763 * Steps 1-4 below provide general overview of dirty page logging. See
3764 * kvm_get_dirty_log_protect() function description for additional details.
3765 *
3766 * We call kvm_get_dirty_log_protect() to handle steps 1-3, upon return we
3767 * always flush the TLB (step 4) even if previous step failed and the dirty
3768 * bitmap may be corrupt. Regardless of previous outcome the KVM logging API
3769 * does not preclude user space subsequent dirty log read. Flushing TLB ensures
3770 * writes will be marked dirty for next log read.
95d4c16c 3771 *
60c34612
TY		 3772 * 1. Take a snapshot of the bit and clear it if needed.
3773 * 2. Write protect the corresponding page.
e108ff2f
PB		 3774 * 3. Copy the snapshot to the userspace.
3775 * 4. Flush TLB's if needed.
5bb064dc 3776 */
60c34612 3777int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
5bb064dc 3778{
60c34612 3779 bool is_dirty = false;
e108ff2f 3780 int r;
5bb064dc 3781
79fac95e 3782 mutex_lock(&kvm->slots_lock);
5bb064dc 3783
88178fd4
KH		 3784 /*
3785 * Flush potentially hardware-cached dirty pages to dirty_bitmap.
3786 */
3787 if (kvm_x86_ops->flush_log_dirty)
3788 kvm_x86_ops->flush_log_dirty(kvm);
3789
e108ff2f 3790 r = kvm_get_dirty_log_protect(kvm, log, &is_dirty);
198c74f4
XG		 3791
3792 /*
3793 * All the TLBs can be flushed out of mmu lock, see the comments in
3794 * kvm_mmu_slot_remove_write_access().
3795 */
e108ff2f 3796 lockdep_assert_held(&kvm->slots_lock);
198c74f4
XG		 3797 if (is_dirty)
3798 kvm_flush_remote_tlbs(kvm);
3799
79fac95e 3800 mutex_unlock(&kvm->slots_lock);
5bb064dc
ZX		 3801 return r;
3802}
3803
aa2fbe6d
YZ		 3804int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
3805 bool line_status)
23d43cf9
CD		 3806{
3807 if (!irqchip_in_kernel(kvm))
3808 return -ENXIO;
3809
3810 irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
aa2fbe6d
YZ		 3811 irq_event->irq, irq_event->level,
3812 line_status);
23d43cf9
CD		 3813 return 0;
3814}
3815
1fe779f8
CO		 3816long kvm_arch_vm_ioctl(struct file *filp,
3817 unsigned int ioctl, unsigned long arg)
3818{
3819 struct kvm *kvm = filp->private_data;
3820 void __user *argp = (void __user *)arg;
367e1319 3821 int r = -ENOTTY;
f0d66275
DH		 3822 /*
3823 * This union makes it completely explicit to gcc-3.x
3824 * that these two variables' stack usage should be
3825 * combined, not added together.
3826 */
3827 union {
3828 struct kvm_pit_state ps;
e9f42757 3829 struct kvm_pit_state2 ps2;
c5ff41ce 3830 struct kvm_pit_config pit_config;
f0d66275 3831 } u;
1fe779f8
CO		 3832
3833 switch (ioctl) {
3834 case KVM_SET_TSS_ADDR:
3835 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1fe779f8 3836 break;
b927a3ce
SY		 3837 case KVM_SET_IDENTITY_MAP_ADDR: {
3838 u64 ident_addr;
3839
3840 r = -EFAULT;
3841 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3842 goto out;
3843 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
b927a3ce
SY		 3844 break;
3845 }
1fe779f8
CO		 3846 case KVM_SET_NR_MMU_PAGES:
3847 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1fe779f8
CO		 3848 break;
3849 case KVM_GET_NR_MMU_PAGES:
3850 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3851 break;
3ddea128
MT		 3852 case KVM_CREATE_IRQCHIP: {
3853 struct kvm_pic *vpic;
3854
3855 mutex_lock(&kvm->lock);
3856 r = -EEXIST;
3857 if (kvm->arch.vpic)
3858 goto create_irqchip_unlock;
3e515705
AK		 3859 r = -EINVAL;
3860 if (atomic_read(&kvm->online_vcpus))
3861 goto create_irqchip_unlock;
1fe779f8 3862 r = -ENOMEM;
3ddea128
MT		 3863 vpic = kvm_create_pic(kvm);
3864 if (vpic) {
1fe779f8
CO		 3865 r = kvm_ioapic_init(kvm);
3866 if (r) {
175504cd 3867 mutex_lock(&kvm->slots_lock);
72bb2fcd 3868 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
743eeb0b
SL		 3869 &vpic->dev_master);
3870 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3871 &vpic->dev_slave);
3872 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3873 &vpic->dev_eclr);
175504cd 3874 mutex_unlock(&kvm->slots_lock);
3ddea128
MT		 3875 kfree(vpic);
3876 goto create_irqchip_unlock;
1fe779f8
CO		 3877 }
3878 } else
3ddea128
MT		 3879 goto create_irqchip_unlock;
3880 smp_wmb();
3881 kvm->arch.vpic = vpic;
3882 smp_wmb();
399ec807
AK		 3883 r = kvm_setup_default_irq_routing(kvm);
3884 if (r) {
175504cd 3885 mutex_lock(&kvm->slots_lock);
3ddea128 3886 mutex_lock(&kvm->irq_lock);
72bb2fcd
WY		 3887 kvm_ioapic_destroy(kvm);
3888 kvm_destroy_pic(kvm);
3ddea128 3889 mutex_unlock(&kvm->irq_lock);
175504cd 3890 mutex_unlock(&kvm->slots_lock);
399ec807 3891 }
3ddea128
MT		 3892 create_irqchip_unlock:
3893 mutex_unlock(&kvm->lock);
1fe779f8 3894 break;
3ddea128 3895 }
7837699f 3896 case KVM_CREATE_PIT:
c5ff41ce
JK		 3897 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3898 goto create_pit;
3899 case KVM_CREATE_PIT2:
3900 r = -EFAULT;
3901 if (copy_from_user(&u.pit_config, argp,
3902 sizeof(struct kvm_pit_config)))
3903 goto out;
3904 create_pit:
79fac95e 3905 mutex_lock(&kvm->slots_lock);
269e05e4
AK		 3906 r = -EEXIST;
3907 if (kvm->arch.vpit)
3908 goto create_pit_unlock;
7837699f 3909 r = -ENOMEM;
c5ff41ce 3910 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
7837699f
SY		 3911 if (kvm->arch.vpit)
3912 r = 0;
269e05e4 3913 create_pit_unlock:
79fac95e 3914 mutex_unlock(&kvm->slots_lock);
7837699f 3915 break;
1fe779f8
CO		 3916 case KVM_GET_IRQCHIP: {
3917 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
ff5c2c03 3918 struct kvm_irqchip *chip;
1fe779f8 3919
ff5c2c03
SL		 3920 chip = memdup_user(argp, sizeof(*chip));
3921 if (IS_ERR(chip)) {
3922 r = PTR_ERR(chip);
1fe779f8 3923 goto out;
ff5c2c03
SL		 3924 }
3925
1fe779f8
CO		 3926 r = -ENXIO;
3927 if (!irqchip_in_kernel(kvm))
f0d66275
DH		 3928 goto get_irqchip_out;
3929 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
1fe779f8 3930 if (r)
f0d66275 3931 goto get_irqchip_out;
1fe779f8 3932 r = -EFAULT;
f0d66275
DH		 3933 if (copy_to_user(argp, chip, sizeof *chip))
3934 goto get_irqchip_out;
1fe779f8 3935 r = 0;
f0d66275
DH		 3936 get_irqchip_out:
3937 kfree(chip);
1fe779f8
CO		 3938 break;
3939 }
3940 case KVM_SET_IRQCHIP: {
3941 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
ff5c2c03 3942 struct kvm_irqchip *chip;
1fe779f8 3943
ff5c2c03
SL		 3944 chip = memdup_user(argp, sizeof(*chip));
3945 if (IS_ERR(chip)) {
3946 r = PTR_ERR(chip);
1fe779f8 3947 goto out;
ff5c2c03
SL		 3948 }
3949
1fe779f8
CO		 3950 r = -ENXIO;
3951 if (!irqchip_in_kernel(kvm))
f0d66275
DH		 3952 goto set_irqchip_out;
3953 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
1fe779f8 3954 if (r)
f0d66275 3955 goto set_irqchip_out;
1fe779f8 3956 r = 0;
f0d66275
DH		 3957 set_irqchip_out:
3958 kfree(chip);
1fe779f8
CO		 3959 break;
3960 }
e0f63cb9 3961 case KVM_GET_PIT: {
e0f63cb9 3962 r = -EFAULT;
f0d66275 3963 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
e0f63cb9
SY		 3964 goto out;
3965 r = -ENXIO;
3966 if (!kvm->arch.vpit)
3967 goto out;
f0d66275 3968 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
e0f63cb9
SY		 3969 if (r)
3970 goto out;
3971 r = -EFAULT;
f0d66275 3972 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
e0f63cb9
SY		 3973 goto out;
3974 r = 0;
3975 break;
3976 }
3977 case KVM_SET_PIT: {
e0f63cb9 3978 r = -EFAULT;
f0d66275 3979 if (copy_from_user(&u.ps, argp, sizeof u.ps))
e0f63cb9
SY		 3980 goto out;
3981 r = -ENXIO;
3982 if (!kvm->arch.vpit)
3983 goto out;
f0d66275 3984 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
e0f63cb9
SY		 3985 break;
3986 }
e9f42757
BK		 3987 case KVM_GET_PIT2: {
3988 r = -ENXIO;
3989 if (!kvm->arch.vpit)
3990 goto out;
3991 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3992 if (r)
3993 goto out;
3994 r = -EFAULT;
3995 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3996 goto out;
3997 r = 0;
3998 break;
3999 }
4000 case KVM_SET_PIT2: {
4001 r = -EFAULT;
4002 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
4003 goto out;
4004 r = -ENXIO;
4005 if (!kvm->arch.vpit)
4006 goto out;
4007 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
e9f42757
BK		 4008 break;
4009 }
52d939a0
MT		 4010 case KVM_REINJECT_CONTROL: {
4011 struct kvm_reinject_control control;
4012 r = -EFAULT;
4013 if (copy_from_user(&control, argp, sizeof(control)))
4014 goto out;
4015 r = kvm_vm_ioctl_reinject(kvm, &control);
52d939a0
MT		 4016 break;
4017 }
ffde22ac
ES		 4018 case KVM_XEN_HVM_CONFIG: {
4019 r = -EFAULT;
4020 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
4021 sizeof(struct kvm_xen_hvm_config)))
4022 goto out;
4023 r = -EINVAL;
4024 if (kvm->arch.xen_hvm_config.flags)
4025 goto out;
4026 r = 0;
4027 break;
4028 }
afbcf7ab 4029 case KVM_SET_CLOCK: {
afbcf7ab
GC		 4030 struct kvm_clock_data user_ns;
4031 u64 now_ns;
4032 s64 delta;
4033
4034 r = -EFAULT;
4035 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
4036 goto out;
4037
4038 r = -EINVAL;
4039 if (user_ns.flags)
4040 goto out;
4041
4042 r = 0;
395c6b0a 4043 local_irq_disable();
759379dd 4044 now_ns = get_kernel_ns();
afbcf7ab 4045 delta = user_ns.clock - now_ns;
395c6b0a 4046 local_irq_enable();
afbcf7ab 4047 kvm->arch.kvmclock_offset = delta;
2e762ff7 4048 kvm_gen_update_masterclock(kvm);
afbcf7ab
GC		 4049 break;
4050 }
4051 case KVM_GET_CLOCK: {
afbcf7ab
GC		 4052 struct kvm_clock_data user_ns;
4053 u64 now_ns;
4054
395c6b0a 4055 local_irq_disable();
759379dd 4056 now_ns = get_kernel_ns();
afbcf7ab 4057 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
395c6b0a 4058 local_irq_enable();
afbcf7ab 4059 user_ns.flags = 0;
97e69aa6 4060 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
afbcf7ab
GC		 4061
4062 r = -EFAULT;
4063 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
4064 goto out;
4065 r = 0;
4066 break;
4067 }
4068
1fe779f8 4069 default:
c274e03a 4070 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1fe779f8
CO		 4071 }
4072out:
4073 return r;
4074}
4075
a16b043c 4076static void kvm_init_msr_list(void)
043405e1
CO		 4077{
4078 u32 dummy[2];
4079 unsigned i, j;
4080
e3267cbb
GC		 4081 /* skip the first msrs in the list. KVM-specific */
4082 for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
043405e1
CO		 4083 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
4084 continue;
93c4adc7
PB		 4085
4086 /*
4087 * Even MSRs that are valid in the host may not be exposed
4088 * to the guests in some cases. We could work around this
4089 * in VMX with the generic MSR save/load machinery, but it
4090 * is not really worthwhile since it will really only
4091 * happen with nested virtualization.
4092 */
4093 switch (msrs_to_save[i]) {
4094 case MSR_IA32_BNDCFGS:
4095 if (!kvm_x86_ops->mpx_supported())
4096 continue;
4097 break;
4098 default:
4099 break;
4100 }
4101
043405e1
CO		 4102 if (j < i)
4103 msrs_to_save[j] = msrs_to_save[i];
4104 j++;
4105 }
4106 num_msrs_to_save = j;
4107}
4108
bda9020e
MT		 4109static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
4110 const void *v)
bbd9b64e 4111{
70252a10
AK		 4112 int handled = 0;
4113 int n;
4114
4115 do {
4116 n = min(len, 8);
4117 if (!(vcpu->arch.apic &&
4118 !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
4119 && kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
4120 break;
4121 handled += n;
4122 addr += n;
4123 len -= n;
4124 v += n;
4125 } while (len);
bbd9b64e 4126
70252a10 4127 return handled;
bbd9b64e
CO		 4128}
4129
bda9020e 4130static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
bbd9b64e 4131{
70252a10
AK		 4132 int handled = 0;
4133 int n;
4134
4135 do {
4136 n = min(len, 8);
4137 if (!(vcpu->arch.apic &&
4138 !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
4139 && kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
4140 break;
4141 trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
4142 handled += n;
4143 addr += n;
4144 len -= n;
4145 v += n;
4146 } while (len);
bbd9b64e 4147
70252a10 4148 return handled;
bbd9b64e
CO		 4149}
4150
2dafc6c2
GN		 4151static void kvm_set_segment(struct kvm_vcpu *vcpu,
4152 struct kvm_segment *var, int seg)
4153{
4154 kvm_x86_ops->set_segment(vcpu, var, seg);
4155}
4156
4157void kvm_get_segment(struct kvm_vcpu *vcpu,
4158 struct kvm_segment *var, int seg)
4159{
4160 kvm_x86_ops->get_segment(vcpu, var, seg);
4161}
4162
54987b7a
PB		 4163gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access,
4164 struct x86_exception *exception)
02f59dc9
JR		 4165{
4166 gpa_t t_gpa;
02f59dc9
JR		 4167
4168 BUG_ON(!mmu_is_nested(vcpu));
4169
4170 /* NPT walks are always user-walks */
4171 access |= PFERR_USER_MASK;
54987b7a 4172 t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, exception);
02f59dc9
JR		 4173
4174 return t_gpa;
4175}
4176
ab9ae313
AK		 4177gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
4178 struct x86_exception *exception)
1871c602
GN		 4179{
4180 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
ab9ae313 4181 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
1871c602
GN		 4182}
4183
ab9ae313
AK		 4184 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
4185 struct x86_exception *exception)
1871c602
GN		 4186{
4187 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4188 access |= PFERR_FETCH_MASK;
ab9ae313 4189 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
1871c602
GN		 4190}
4191
ab9ae313
AK		 4192gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
4193 struct x86_exception *exception)
1871c602
GN		 4194{
4195 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
4196 access |= PFERR_WRITE_MASK;
ab9ae313 4197 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
1871c602
GN		 4198}
4199
4200/* uses this to access any guest's mapped memory without checking CPL */
ab9ae313
AK		 4201gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
4202 struct x86_exception *exception)
1871c602 4203{
ab9ae313 4204 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
1871c602
GN		 4205}
4206
4207static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
4208 struct kvm_vcpu *vcpu, u32 access,
bcc55cba 4209 struct x86_exception *exception)
bbd9b64e
CO		 4210{
4211 void *data = val;
10589a46 4212 int r = X86EMUL_CONTINUE;
bbd9b64e
CO		 4213
4214 while (bytes) {
14dfe855 4215 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
ab9ae313 4216 exception);
bbd9b64e 4217 unsigned offset = addr & (PAGE_SIZE-1);
77c2002e 4218 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
bbd9b64e
CO		 4219 int ret;
4220
bcc55cba 4221 if (gpa == UNMAPPED_GVA)
ab9ae313 4222 return X86EMUL_PROPAGATE_FAULT;
44583cba
PB		 4223 ret = kvm_read_guest_page(vcpu->kvm, gpa >> PAGE_SHIFT, data,
4224 offset, toread);
10589a46 4225 if (ret < 0) {
c3cd7ffa 4226 r = X86EMUL_IO_NEEDED;
10589a46
MT		 4227 goto out;
4228 }
bbd9b64e 4229
77c2002e
IE		 4230 bytes -= toread;
4231 data += toread;
4232 addr += toread;
bbd9b64e 4233 }
10589a46 4234out:
10589a46 4235 return r;
bbd9b64e 4236}
77c2002e 4237
1871c602 4238/* used for instruction fetching */
0f65dd70
AK		 4239static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
4240 gva_t addr, void *val, unsigned int bytes,
bcc55cba 4241 struct x86_exception *exception)
1871c602 4242{
0f65dd70 4243 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
1871c602 4244 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
44583cba
PB		 4245 unsigned offset;
4246 int ret;
0f65dd70 4247
44583cba
PB		 4248 /* Inline kvm_read_guest_virt_helper for speed. */
4249 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access|PFERR_FETCH_MASK,
4250 exception);
4251 if (unlikely(gpa == UNMAPPED_GVA))
4252 return X86EMUL_PROPAGATE_FAULT;
4253
4254 offset = addr & (PAGE_SIZE-1);
4255 if (WARN_ON(offset + bytes > PAGE_SIZE))
4256 bytes = (unsigned)PAGE_SIZE - offset;
4257 ret = kvm_read_guest_page(vcpu->kvm, gpa >> PAGE_SHIFT, val,
4258 offset, bytes);
4259 if (unlikely(ret < 0))
4260 return X86EMUL_IO_NEEDED;
4261
4262 return X86EMUL_CONTINUE;
1871c602
GN		 4263}
4264
064aea77 4265int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt,
0f65dd70 4266 gva_t addr, void *val, unsigned int bytes,
bcc55cba 4267 struct x86_exception *exception)
1871c602 4268{
0f65dd70 4269 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
1871c602 4270 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
0f65dd70 4271
1871c602 4272 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
bcc55cba 4273 exception);
1871c602 4274}
064aea77 4275EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
1871c602 4276
0f65dd70
AK		 4277static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt,
4278 gva_t addr, void *val, unsigned int bytes,
bcc55cba 4279 struct x86_exception *exception)
1871c602 4280{
0f65dd70 4281 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
bcc55cba 4282 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
1871c602
GN		 4283}
4284
6a4d7550 4285int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
0f65dd70 4286 gva_t addr, void *val,
2dafc6c2 4287 unsigned int bytes,
bcc55cba 4288 struct x86_exception *exception)
77c2002e 4289{
0f65dd70 4290 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
77c2002e
IE		 4291 void *data = val;
4292 int r = X86EMUL_CONTINUE;
4293
4294 while (bytes) {
14dfe855
JR		 4295 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
4296 PFERR_WRITE_MASK,
ab9ae313 4297 exception);
77c2002e
IE		 4298 unsigned offset = addr & (PAGE_SIZE-1);
4299 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
4300 int ret;
4301
bcc55cba 4302 if (gpa == UNMAPPED_GVA)
ab9ae313 4303 return X86EMUL_PROPAGATE_FAULT;
77c2002e
IE		 4304 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
4305 if (ret < 0) {
c3cd7ffa 4306 r = X86EMUL_IO_NEEDED;
77c2002e
IE		 4307 goto out;
4308 }
4309
4310 bytes -= towrite;
4311 data += towrite;
4312 addr += towrite;
4313 }
4314out:
4315 return r;
4316}
6a4d7550 4317EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
77c2002e 4318
af7cc7d1
XG		 4319static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
4320 gpa_t *gpa, struct x86_exception *exception,
4321 bool write)
4322{
97d64b78
AK		 4323 u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0)
4324 | (write ? PFERR_WRITE_MASK : 0);
af7cc7d1 4325
97d64b78 4326 if (vcpu_match_mmio_gva(vcpu, gva)
97ec8c06
FW		 4327 && !permission_fault(vcpu, vcpu->arch.walk_mmu,
4328 vcpu->arch.access, access)) {
bebb106a
XG		 4329 *gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
4330 (gva & (PAGE_SIZE - 1));
4f022648 4331 trace_vcpu_match_mmio(gva, *gpa, write, false);
bebb106a
XG		 4332 return 1;
4333 }
4334
af7cc7d1
XG		 4335 *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
4336
4337 if (*gpa == UNMAPPED_GVA)
4338 return -1;
4339
4340 /* For APIC access vmexit */
4341 if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
4342 return 1;
4343
4f022648
XG		 4344 if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
4345 trace_vcpu_match_mmio(gva, *gpa, write, true);
bebb106a 4346 return 1;
4f022648 4347 }
bebb106a 4348
af7cc7d1
XG		 4349 return 0;
4350}
4351
3200f405 4352int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
bcc55cba 4353 const void *val, int bytes)
bbd9b64e
CO		 4354{
4355 int ret;
4356
4357 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
9f811285 4358 if (ret < 0)
bbd9b64e 4359 return 0;
f57f2ef5 4360 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
bbd9b64e
CO		 4361 return 1;
4362}
4363
77d197b2
XG		 4364struct read_write_emulator_ops {
4365 int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
4366 int bytes);
4367 int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
4368 void *val, int bytes);
4369 int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
4370 int bytes, void *val);
4371 int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
4372 void *val, int bytes);
4373 bool write;
4374};
4375
4376static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
4377{
4378 if (vcpu->mmio_read_completed) {
77d197b2 4379 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
f78146b0 4380 vcpu->mmio_fragments[0].gpa, *(u64 *)val);
77d197b2
XG		 4381 vcpu->mmio_read_completed = 0;
4382 return 1;
4383 }
4384
4385 return 0;
4386}
4387
4388static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
4389 void *val, int bytes)
4390{
4391 return !kvm_read_guest(vcpu->kvm, gpa, val, bytes);
4392}
4393
4394static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
4395 void *val, int bytes)
4396{
4397 return emulator_write_phys(vcpu, gpa, val, bytes);
4398}
4399
4400static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
4401{
4402 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
4403 return vcpu_mmio_write(vcpu, gpa, bytes, val);
4404}
4405
4406static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
4407 void *val, int bytes)
4408{
4409 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
4410 return X86EMUL_IO_NEEDED;
4411}
4412
4413static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
4414 void *val, int bytes)
4415{
f78146b0
AK		 4416 struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
4417
87da7e66 4418 memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
77d197b2
XG		 4419 return X86EMUL_CONTINUE;
4420}
4421
0fbe9b0b 4422static const struct read_write_emulator_ops read_emultor = {
77d197b2
XG		 4423 .read_write_prepare = read_prepare,
4424 .read_write_emulate = read_emulate,
4425 .read_write_mmio = vcpu_mmio_read,
4426 .read_write_exit_mmio = read_exit_mmio,
4427};
4428
0fbe9b0b 4429static const struct read_write_emulator_ops write_emultor = {
77d197b2
XG		 4430 .read_write_emulate = write_emulate,
4431 .read_write_mmio = write_mmio,
4432 .read_write_exit_mmio = write_exit_mmio,
4433 .write = true,
4434};
4435
22388a3c
XG		 4436static int emulator_read_write_onepage(unsigned long addr, void *val,
4437 unsigned int bytes,
4438 struct x86_exception *exception,
4439 struct kvm_vcpu *vcpu,
0fbe9b0b 4440 const struct read_write_emulator_ops *ops)
bbd9b64e 4441{
af7cc7d1
XG		 4442 gpa_t gpa;
4443 int handled, ret;
22388a3c 4444 bool write = ops->write;
f78146b0 4445 struct kvm_mmio_fragment *frag;
10589a46 4446
22388a3c 4447 ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
bbd9b64e 4448
af7cc7d1 4449 if (ret < 0)
bbd9b64e 4450 return X86EMUL_PROPAGATE_FAULT;
bbd9b64e
CO		 4451
4452 /* For APIC access vmexit */
af7cc7d1 4453 if (ret)
bbd9b64e
CO		 4454 goto mmio;
4455
22388a3c 4456 if (ops->read_write_emulate(vcpu, gpa, val, bytes))
bbd9b64e
CO		 4457 return X86EMUL_CONTINUE;
4458
4459mmio:
4460 /*
4461 * Is this MMIO handled locally?
4462 */
22388a3c 4463 handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
70252a10 4464 if (handled == bytes)
bbd9b64e 4465 return X86EMUL_CONTINUE;
bbd9b64e 4466
70252a10
AK		 4467 gpa += handled;
4468 bytes -= handled;
4469 val += handled;
4470
87da7e66
XG		 4471 WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS);
4472 frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
4473 frag->gpa = gpa;
4474 frag->data = val;
4475 frag->len = bytes;
f78146b0 4476 return X86EMUL_CONTINUE;
bbd9b64e
CO		 4477}
4478
22388a3c
XG		 4479int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
4480 void *val, unsigned int bytes,
4481 struct x86_exception *exception,
0fbe9b0b 4482 const struct read_write_emulator_ops *ops)
bbd9b64e 4483{
0f65dd70 4484 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
f78146b0
AK		 4485 gpa_t gpa;
4486 int rc;
4487
4488 if (ops->read_write_prepare &&
4489 ops->read_write_prepare(vcpu, val, bytes))
4490 return X86EMUL_CONTINUE;
4491
4492 vcpu->mmio_nr_fragments = 0;
0f65dd70 4493
bbd9b64e
CO		 4494 /* Crossing a page boundary? */
4495 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
f78146b0 4496 int now;
bbd9b64e
CO		 4497
4498 now = -addr & ~PAGE_MASK;
22388a3c
XG		 4499 rc = emulator_read_write_onepage(addr, val, now, exception,
4500 vcpu, ops);
4501
bbd9b64e
CO		 4502 if (rc != X86EMUL_CONTINUE)
4503 return rc;
4504 addr += now;
bac15531
NA		 4505 if (ctxt->mode != X86EMUL_MODE_PROT64)
4506 addr = (u32)addr;
bbd9b64e
CO		 4507 val += now;
4508 bytes -= now;
4509 }
22388a3c 4510
f78146b0
AK		 4511 rc = emulator_read_write_onepage(addr, val, bytes, exception,
4512 vcpu, ops);
4513 if (rc != X86EMUL_CONTINUE)
4514 return rc;
4515
4516 if (!vcpu->mmio_nr_fragments)
4517 return rc;
4518
4519 gpa = vcpu->mmio_fragments[0].gpa;
4520
4521 vcpu->mmio_needed = 1;
4522 vcpu->mmio_cur_fragment = 0;
4523
87da7e66 4524 vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len);
f78146b0
AK		 4525 vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
4526 vcpu->run->exit_reason = KVM_EXIT_MMIO;
4527 vcpu->run->mmio.phys_addr = gpa;
4528
4529 return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
22388a3c
XG		 4530}
4531
4532static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
4533 unsigned long addr,
4534 void *val,
4535 unsigned int bytes,
4536 struct x86_exception *exception)
4537{
4538 return emulator_read_write(ctxt, addr, val, bytes,
4539 exception, &read_emultor);
4540}
4541
4542int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
4543 unsigned long addr,
4544 const void *val,
4545 unsigned int bytes,
4546 struct x86_exception *exception)
4547{
4548 return emulator_read_write(ctxt, addr, (void *)val, bytes,
4549 exception, &write_emultor);
bbd9b64e 4550}
bbd9b64e 4551
daea3e73
AK		 4552#define CMPXCHG_TYPE(t, ptr, old, new) \
4553 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
4554
4555#ifdef CONFIG_X86_64
4556# define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
4557#else
4558# define CMPXCHG64(ptr, old, new) \
9749a6c0 4559 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
daea3e73
AK		 4560#endif
4561
0f65dd70
AK		 4562static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
4563 unsigned long addr,
bbd9b64e
CO		 4564 const void *old,
4565 const void *new,
4566 unsigned int bytes,
0f65dd70 4567 struct x86_exception *exception)
bbd9b64e 4568{
0f65dd70 4569 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
daea3e73
AK		 4570 gpa_t gpa;
4571 struct page *page;
4572 char *kaddr;
4573 bool exchanged;
2bacc55c 4574
daea3e73
AK		 4575 /* guests cmpxchg8b have to be emulated atomically */
4576 if (bytes > 8 || (bytes & (bytes - 1)))
4577 goto emul_write;
10589a46 4578
daea3e73 4579 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
2bacc55c 4580
daea3e73
AK		 4581 if (gpa == UNMAPPED_GVA ||
4582 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
4583 goto emul_write;
2bacc55c 4584
daea3e73
AK		 4585 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
4586 goto emul_write;
72dc67a6 4587
daea3e73 4588 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
32cad84f 4589 if (is_error_page(page))
c19b8bd6 4590 goto emul_write;
72dc67a6 4591
8fd75e12 4592 kaddr = kmap_atomic(page);
daea3e73
AK		 4593 kaddr += offset_in_page(gpa);
4594 switch (bytes) {
4595 case 1:
4596 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
4597 break;
4598 case 2:
4599 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
4600 break;
4601 case 4:
4602 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
4603 break;
4604 case 8:
4605 exchanged = CMPXCHG64(kaddr, old, new);
4606 break;
4607 default:
4608 BUG();
2bacc55c 4609 }
8fd75e12 4610 kunmap_atomic(kaddr);
daea3e73
AK		 4611 kvm_release_page_dirty(page);
4612
4613 if (!exchanged)
4614 return X86EMUL_CMPXCHG_FAILED;
4615
d3714010 4616 mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
f57f2ef5 4617 kvm_mmu_pte_write(vcpu, gpa, new, bytes);
8f6abd06
GN		 4618
4619 return X86EMUL_CONTINUE;
4a5f48f6 4620
3200f405 4621emul_write:
daea3e73 4622 printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
2bacc55c 4623
0f65dd70 4624 return emulator_write_emulated(ctxt, addr, new, bytes, exception);
bbd9b64e
CO		 4625}
4626
cf8f70bf
GN		 4627static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
4628{
4629 /* TODO: String I/O for in kernel device */
4630 int r;
4631
4632 if (vcpu->arch.pio.in)
4633 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
4634 vcpu->arch.pio.size, pd);
4635 else
4636 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
4637 vcpu->arch.pio.port, vcpu->arch.pio.size,
4638 pd);
4639 return r;
4640}
4641
6f6fbe98
XG		 4642static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
4643 unsigned short port, void *val,
4644 unsigned int count, bool in)
cf8f70bf 4645{
cf8f70bf 4646 vcpu->arch.pio.port = port;
6f6fbe98 4647 vcpu->arch.pio.in = in;
7972995b 4648 vcpu->arch.pio.count = count;
cf8f70bf
GN		 4649 vcpu->arch.pio.size = size;
4650
4651 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
7972995b 4652 vcpu->arch.pio.count = 0;
cf8f70bf
GN		 4653 return 1;
4654 }
4655
4656 vcpu->run->exit_reason = KVM_EXIT_IO;
6f6fbe98 4657 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
cf8f70bf
GN		 4658 vcpu->run->io.size = size;
4659 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4660 vcpu->run->io.count = count;
4661 vcpu->run->io.port = port;
4662
4663 return 0;
4664}
4665
6f6fbe98
XG		 4666static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
4667 int size, unsigned short port, void *val,
4668 unsigned int count)
cf8f70bf 4669{
ca1d4a9e 4670 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
6f6fbe98 4671 int ret;
ca1d4a9e 4672
6f6fbe98
XG		 4673 if (vcpu->arch.pio.count)
4674 goto data_avail;
cf8f70bf 4675
6f6fbe98
XG		 4676 ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
4677 if (ret) {
4678data_avail:
4679 memcpy(val, vcpu->arch.pio_data, size * count);
1171903d 4680 trace_kvm_pio(KVM_PIO_IN, port, size, count, vcpu->arch.pio_data);
7972995b 4681 vcpu->arch.pio.count = 0;
cf8f70bf
GN		 4682 return 1;
4683 }
4684
cf8f70bf
GN		 4685 return 0;
4686}
4687
6f6fbe98
XG		 4688static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
4689 int size, unsigned short port,
4690 const void *val, unsigned int count)
4691{
4692 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
4693
4694 memcpy(vcpu->arch.pio_data, val, size * count);
1171903d 4695 trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data);
6f6fbe98
XG		 4696 return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
4697}
4698
bbd9b64e
CO		 4699static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
4700{
4701 return kvm_x86_ops->get_segment_base(vcpu, seg);
4702}
4703
3cb16fe7 4704static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
bbd9b64e 4705{
3cb16fe7 4706 kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
bbd9b64e
CO		 4707}
4708
5cb56059 4709int kvm_emulate_wbinvd_noskip(struct kvm_vcpu *vcpu)
f5f48ee1
SY		 4710{
4711 if (!need_emulate_wbinvd(vcpu))
4712 return X86EMUL_CONTINUE;
4713
4714 if (kvm_x86_ops->has_wbinvd_exit()) {
2eec7343
JK		 4715 int cpu = get_cpu();
4716
4717 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
f5f48ee1
SY		 4718 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
4719 wbinvd_ipi, NULL, 1);
2eec7343 4720 put_cpu();
f5f48ee1 4721 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
2eec7343
JK		 4722 } else
4723 wbinvd();
f5f48ee1
SY		 4724 return X86EMUL_CONTINUE;
4725}
5cb56059
JS		 4726
4727int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
4728{
4729 kvm_x86_ops->skip_emulated_instruction(vcpu);
4730 return kvm_emulate_wbinvd_noskip(vcpu);
4731}
f5f48ee1
SY		 4732EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
4733
5cb56059
JS		 4734
4735
bcaf5cc5
AK		 4736static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
4737{
5cb56059 4738 kvm_emulate_wbinvd_noskip(emul_to_vcpu(ctxt));
bcaf5cc5
AK		 4739}
4740
717746e3 4741int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
bbd9b64e 4742{
16f8a6f9 4743 return kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
bbd9b64e
CO		 4744}
4745
717746e3 4746int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
bbd9b64e 4747{
338dbc97 4748
717746e3 4749 return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
bbd9b64e
CO		 4750}
4751
52a46617 4752static u64 mk_cr_64(u64 curr_cr, u32 new_val)
5fdbf976 4753{
52a46617 4754 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
5fdbf976
MT		 4755}
4756
717746e3 4757static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
bbd9b64e 4758{
717746e3 4759 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
52a46617
GN		 4760 unsigned long value;
4761
4762 switch (cr) {
4763 case 0:
4764 value = kvm_read_cr0(vcpu);
4765 break;
4766 case 2:
4767 value = vcpu->arch.cr2;
4768 break;
4769 case 3:
9f8fe504 4770 value = kvm_read_cr3(vcpu);
52a46617
GN		 4771 break;
4772 case 4:
4773 value = kvm_read_cr4(vcpu);
4774 break;
4775 case 8:
4776 value = kvm_get_cr8(vcpu);
4777 break;
4778 default:
a737f256 4779 kvm_err("%s: unexpected cr %u\n", __func__, cr);
52a46617
GN		 4780 return 0;
4781 }
4782
4783 return value;
4784}
4785
717746e3 4786static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
52a46617 4787{
717746e3 4788 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
0f12244f
GN		 4789 int res = 0;
4790
52a46617
GN		 4791 switch (cr) {
4792 case 0:
49a9b07e 4793 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
52a46617
GN		 4794 break;
4795 case 2:
4796 vcpu->arch.cr2 = val;
4797 break;
4798 case 3:
2390218b 4799 res = kvm_set_cr3(vcpu, val);
52a46617
GN		 4800 break;
4801 case 4:
a83b29c6 4802 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
52a46617
GN		 4803 break;
4804 case 8:
eea1cff9 4805 res = kvm_set_cr8(vcpu, val);
52a46617
GN		 4806 break;
4807 default:
a737f256 4808 kvm_err("%s: unexpected cr %u\n", __func__, cr);
0f12244f 4809 res = -1;
52a46617 4810 }
0f12244f
GN		 4811
4812 return res;
52a46617
GN		 4813}
4814
717746e3 4815static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
9c537244 4816{
717746e3 4817 return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
9c537244
GN		 4818}
4819
4bff1e86 4820static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
2dafc6c2 4821{
4bff1e86 4822 kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
2dafc6c2
GN		 4823}
4824
4bff1e86 4825static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
160ce1f1 4826{
4bff1e86 4827 kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
160ce1f1
MG		 4828}
4829
1ac9d0cf
AK		 4830static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4831{
4832 kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
4833}
4834
4835static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
4836{
4837 kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
4838}
4839
4bff1e86
AK		 4840static unsigned long emulator_get_cached_segment_base(
4841 struct x86_emulate_ctxt *ctxt, int seg)
5951c442 4842{
4bff1e86 4843 return get_segment_base(emul_to_vcpu(ctxt), seg);
5951c442
GN		 4844}
4845
1aa36616
AK		 4846static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
4847 struct desc_struct *desc, u32 *base3,
4848 int seg)
2dafc6c2
GN		 4849{
4850 struct kvm_segment var;
4851
4bff1e86 4852 kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
1aa36616 4853 *selector = var.selector;
2dafc6c2 4854
378a8b09
GN		 4855 if (var.unusable) {
4856 memset(desc, 0, sizeof(*desc));
2dafc6c2 4857 return false;
378a8b09 4858 }
2dafc6c2
GN		 4859
4860 if (var.g)
4861 var.limit >>= 12;
4862 set_desc_limit(desc, var.limit);
4863 set_desc_base(desc, (unsigned long)var.base);
5601d05b
GN		 4864#ifdef CONFIG_X86_64
4865 if (base3)
4866 *base3 = var.base >> 32;
4867#endif
2dafc6c2
GN		 4868 desc->type = var.type;
4869 desc->s = var.s;
4870 desc->dpl = var.dpl;
4871 desc->p = var.present;
4872 desc->avl = var.avl;
4873 desc->l = var.l;
4874 desc->d = var.db;
4875 desc->g = var.g;
4876
4877 return true;
4878}
4879
1aa36616
AK		 4880static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
4881 struct desc_struct *desc, u32 base3,
4882 int seg)
2dafc6c2 4883{
4bff1e86 4884 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
2dafc6c2
GN		 4885 struct kvm_segment var;
4886
1aa36616 4887 var.selector = selector;
2dafc6c2 4888 var.base = get_desc_base(desc);
5601d05b
GN		 4889#ifdef CONFIG_X86_64
4890 var.base |= ((u64)base3) << 32;
4891#endif
2dafc6c2
GN		 4892 var.limit = get_desc_limit(desc);
4893 if (desc->g)
4894 var.limit = (var.limit << 12) | 0xfff;
4895 var.type = desc->type;
2dafc6c2
GN		 4896 var.dpl = desc->dpl;
4897 var.db = desc->d;
4898 var.s = desc->s;
4899 var.l = desc->l;
4900 var.g = desc->g;
4901 var.avl = desc->avl;
4902 var.present = desc->p;
4903 var.unusable = !var.present;
4904 var.padding = 0;
4905
4906 kvm_set_segment(vcpu, &var, seg);
4907 return;
4908}
4909
717746e3
AK		 4910static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
4911 u32 msr_index, u64 *pdata)
4912{
4913 return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
4914}
4915
4916static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
4917 u32 msr_index, u64 data)
4918{
8fe8ab46
WA		 4919 struct msr_data msr;
4920
4921 msr.data = data;
4922 msr.index = msr_index;
4923 msr.host_initiated = false;
4924 return kvm_set_msr(emul_to_vcpu(ctxt), &msr);
717746e3
AK		 4925}
4926
67f4d428
NA		 4927static int emulator_check_pmc(struct x86_emulate_ctxt *ctxt,
4928 u32 pmc)
4929{
4930 return kvm_pmu_check_pmc(emul_to_vcpu(ctxt), pmc);
4931}
4932
222d21aa
AK		 4933static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
4934 u32 pmc, u64 *pdata)
4935{
4936 return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata);
4937}
4938
6c3287f7
AK		 4939static void emulator_halt(struct x86_emulate_ctxt *ctxt)
4940{
4941 emul_to_vcpu(ctxt)->arch.halt_request = 1;
4942}
4943
5037f6f3
AK		 4944static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
4945{
4946 preempt_disable();
5197b808 4947 kvm_load_guest_fpu(emul_to_vcpu(ctxt));
5037f6f3
AK		 4948 /*
4949 * CR0.TS may reference the host fpu state, not the guest fpu state,
4950 * so it may be clear at this point.
4951 */
4952 clts();
4953}
4954
4955static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
4956{
4957 preempt_enable();
4958}
4959
2953538e 4960static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
8a76d7f2 4961 struct x86_instruction_info *info,
c4f035c6
AK		 4962 enum x86_intercept_stage stage)
4963{
2953538e 4964 return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
c4f035c6
AK		 4965}
4966
0017f93a 4967static void emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
bdb42f5a
SB		 4968 u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
4969{
0017f93a 4970 kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx);
bdb42f5a
SB		 4971}
4972
dd856efa
AK		 4973static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
4974{
4975 return kvm_register_read(emul_to_vcpu(ctxt), reg);
4976}
4977
4978static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val)
4979{
4980 kvm_register_write(emul_to_vcpu(ctxt), reg, val);
4981}
4982
801806d9
NA		 4983static void emulator_set_nmi_mask(struct x86_emulate_ctxt *ctxt, bool masked)
4984{
4985 kvm_x86_ops->set_nmi_mask(emul_to_vcpu(ctxt), masked);
4986}
4987
0225fb50 4988static const struct x86_emulate_ops emulate_ops = {
dd856efa
AK		 4989 .read_gpr = emulator_read_gpr,
4990 .write_gpr = emulator_write_gpr,
1871c602 4991 .read_std = kvm_read_guest_virt_system,
2dafc6c2 4992 .write_std = kvm_write_guest_virt_system,
1871c602 4993 .fetch = kvm_fetch_guest_virt,
bbd9b64e
CO		 4994 .read_emulated = emulator_read_emulated,
4995 .write_emulated = emulator_write_emulated,
4996 .cmpxchg_emulated = emulator_cmpxchg_emulated,
3cb16fe7 4997 .invlpg = emulator_invlpg,
cf8f70bf
GN		 4998 .pio_in_emulated = emulator_pio_in_emulated,
4999 .pio_out_emulated = emulator_pio_out_emulated,
1aa36616
AK		 5000 .get_segment = emulator_get_segment,
5001 .set_segment = emulator_set_segment,
5951c442 5002 .get_cached_segment_base = emulator_get_cached_segment_base,
2dafc6c2 5003 .get_gdt = emulator_get_gdt,
160ce1f1 5004 .get_idt = emulator_get_idt,
1ac9d0cf
AK		 5005 .set_gdt = emulator_set_gdt,
5006 .set_idt = emulator_set_idt,
52a46617
GN		 5007 .get_cr = emulator_get_cr,
5008 .set_cr = emulator_set_cr,
9c537244 5009 .cpl = emulator_get_cpl,
35aa5375
GN		 5010 .get_dr = emulator_get_dr,
5011 .set_dr = emulator_set_dr,
717746e3
AK		 5012 .set_msr = emulator_set_msr,
5013 .get_msr = emulator_get_msr,
67f4d428 5014 .check_pmc = emulator_check_pmc,
222d21aa 5015 .read_pmc = emulator_read_pmc,
6c3287f7 5016 .halt = emulator_halt,
bcaf5cc5 5017 .wbinvd = emulator_wbinvd,
d6aa1000 5018 .fix_hypercall = emulator_fix_hypercall,
5037f6f3
AK		 5019 .get_fpu = emulator_get_fpu,
5020 .put_fpu = emulator_put_fpu,
c4f035c6 5021 .intercept = emulator_intercept,
bdb42f5a 5022 .get_cpuid = emulator_get_cpuid,
801806d9 5023 .set_nmi_mask = emulator_set_nmi_mask,
bbd9b64e
CO		 5024};
5025
95cb2295
GN		 5026static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
5027{
37ccdcbe 5028 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu);
95cb2295
GN		 5029 /*
5030 * an sti; sti; sequence only disable interrupts for the first
5031 * instruction. So, if the last instruction, be it emulated or
5032 * not, left the system with the INT_STI flag enabled, it
5033 * means that the last instruction is an sti. We should not
5034 * leave the flag on in this case. The same goes for mov ss
5035 */
37ccdcbe
PB		 5036 if (int_shadow & mask)
5037 mask = 0;
6addfc42 5038 if (unlikely(int_shadow || mask)) {
95cb2295 5039 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
6addfc42
PB		 5040 if (!mask)
5041 kvm_make_request(KVM_REQ_EVENT, vcpu);
5042 }
95cb2295
GN		 5043}
5044
ef54bcfe 5045static bool inject_emulated_exception(struct kvm_vcpu *vcpu)
54b8486f
GN		 5046{
5047 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
da9cb575 5048 if (ctxt->exception.vector == PF_VECTOR)
ef54bcfe
PB		 5049 return kvm_propagate_fault(vcpu, &ctxt->exception);
5050
5051 if (ctxt->exception.error_code_valid)
da9cb575
AK		 5052 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
5053 ctxt->exception.error_code);
54b8486f 5054 else
da9cb575 5055 kvm_queue_exception(vcpu, ctxt->exception.vector);
ef54bcfe 5056 return false;
54b8486f
GN		 5057}
5058
8ec4722d
MG		 5059static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
5060{
adf52235 5061 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
8ec4722d
MG		 5062 int cs_db, cs_l;
5063
8ec4722d
MG		 5064 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
5065
adf52235
TY		 5066 ctxt->eflags = kvm_get_rflags(vcpu);
5067 ctxt->eip = kvm_rip_read(vcpu);
5068 ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
5069 (ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 :
42bf549f 5070 (cs_l && is_long_mode(vcpu)) ? X86EMUL_MODE_PROT64 :
adf52235
TY		 5071 cs_db ? X86EMUL_MODE_PROT32 :
5072 X86EMUL_MODE_PROT16;
5073 ctxt->guest_mode = is_guest_mode(vcpu);
5074
dd856efa 5075 init_decode_cache(ctxt);
7ae441ea 5076 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
8ec4722d
MG		 5077}
5078
71f9833b 5079int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
63995653 5080{
9d74191a 5081 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
63995653
MG		 5082 int ret;
5083
5084 init_emulate_ctxt(vcpu);
5085
9dac77fa
AK		 5086 ctxt->op_bytes = 2;
5087 ctxt->ad_bytes = 2;
5088 ctxt->_eip = ctxt->eip + inc_eip;
9d74191a 5089 ret = emulate_int_real(ctxt, irq);
63995653
MG		 5090
5091 if (ret != X86EMUL_CONTINUE)
5092 return EMULATE_FAIL;
5093
9dac77fa 5094 ctxt->eip = ctxt->_eip;
9d74191a
TY		 5095 kvm_rip_write(vcpu, ctxt->eip);
5096 kvm_set_rflags(vcpu, ctxt->eflags);
63995653
MG		 5097
5098 if (irq == NMI_VECTOR)
7460fb4a 5099 vcpu->arch.nmi_pending = 0;
63995653
MG		 5100 else
5101 vcpu->arch.interrupt.pending = false;
5102
5103 return EMULATE_DONE;
5104}
5105EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
5106
6d77dbfc
GN		 5107static int handle_emulation_failure(struct kvm_vcpu *vcpu)
5108{
fc3a9157
JR		 5109 int r = EMULATE_DONE;
5110
6d77dbfc
GN		 5111 ++vcpu->stat.insn_emulation_fail;
5112 trace_kvm_emulate_insn_failed(vcpu);
a2b9e6c1 5113 if (!is_guest_mode(vcpu) && kvm_x86_ops->get_cpl(vcpu) == 0) {
fc3a9157
JR		 5114 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
5115 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
5116 vcpu->run->internal.ndata = 0;
5117 r = EMULATE_FAIL;
5118 }
6d77dbfc 5119 kvm_queue_exception(vcpu, UD_VECTOR);
fc3a9157
JR		 5120
5121 return r;
6d77dbfc
GN		 5122}
5123
93c05d3e 5124static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2,
991eebf9
GN		 5125 bool write_fault_to_shadow_pgtable,
5126 int emulation_type)
a6f177ef 5127{
95b3cf69 5128 gpa_t gpa = cr2;
8e3d9d06 5129 pfn_t pfn;
a6f177ef 5130
991eebf9
GN		 5131 if (emulation_type & EMULTYPE_NO_REEXECUTE)
5132 return false;
5133
95b3cf69
XG		 5134 if (!vcpu->arch.mmu.direct_map) {
5135 /*
5136 * Write permission should be allowed since only
5137 * write access need to be emulated.
5138 */
5139 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
a6f177ef 5140
95b3cf69
XG		 5141 /*
5142 * If the mapping is invalid in guest, let cpu retry
5143 * it to generate fault.
5144 */
5145 if (gpa == UNMAPPED_GVA)
5146 return true;
5147 }
a6f177ef 5148
8e3d9d06
XG		 5149 /*
5150 * Do not retry the unhandleable instruction if it faults on the
5151 * readonly host memory, otherwise it will goto a infinite loop:
5152 * retry instruction -> write #PF -> emulation fail -> retry
5153 * instruction -> ...
5154 */
5155 pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
95b3cf69
XG		 5156
5157 /*
5158 * If the instruction failed on the error pfn, it can not be fixed,
5159 * report the error to userspace.
5160 */
5161 if (is_error_noslot_pfn(pfn))
5162 return false;
5163
5164 kvm_release_pfn_clean(pfn);
5165
5166 /* The instructions are well-emulated on direct mmu. */
5167 if (vcpu->arch.mmu.direct_map) {
5168 unsigned int indirect_shadow_pages;
5169
5170 spin_lock(&vcpu->kvm->mmu_lock);
5171 indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages;
5172 spin_unlock(&vcpu->kvm->mmu_lock);
5173
5174 if (indirect_shadow_pages)
5175 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
5176
a6f177ef 5177 return true;
8e3d9d06 5178 }
a6f177ef 5179
95b3cf69
XG		 5180 /*
5181 * if emulation was due to access to shadowed page table
5182 * and it failed try to unshadow page and re-enter the
5183 * guest to let CPU execute the instruction.
5184 */
5185 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
93c05d3e
XG		 5186
5187 /*
5188 * If the access faults on its page table, it can not
5189 * be fixed by unprotecting shadow page and it should
5190 * be reported to userspace.
5191 */
5192 return !write_fault_to_shadow_pgtable;
a6f177ef
GN		 5193}
5194
1cb3f3ae
XG		 5195static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
5196 unsigned long cr2, int emulation_type)
5197{
5198 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
5199 unsigned long last_retry_eip, last_retry_addr, gpa = cr2;
5200
5201 last_retry_eip = vcpu->arch.last_retry_eip;
5202 last_retry_addr = vcpu->arch.last_retry_addr;
5203
5204 /*
5205 * If the emulation is caused by #PF and it is non-page_table
5206 * writing instruction, it means the VM-EXIT is caused by shadow
5207 * page protected, we can zap the shadow page and retry this
5208 * instruction directly.
5209 *
5210 * Note: if the guest uses a non-page-table modifying instruction
5211 * on the PDE that points to the instruction, then we will unmap
5212 * the instruction and go to an infinite loop. So, we cache the
5213 * last retried eip and the last fault address, if we meet the eip
5214 * and the address again, we can break out of the potential infinite
5215 * loop.
5216 */
5217 vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
5218
5219 if (!(emulation_type & EMULTYPE_RETRY))
5220 return false;
5221
5222 if (x86_page_table_writing_insn(ctxt))
5223 return false;
5224
5225 if (ctxt->eip == last_retry_eip && last_retry_addr == cr2)
5226 return false;
5227
5228 vcpu->arch.last_retry_eip = ctxt->eip;
5229 vcpu->arch.last_retry_addr = cr2;
5230
5231 if (!vcpu->arch.mmu.direct_map)
5232 gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
5233
22368028 5234 kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
1cb3f3ae
XG		 5235
5236 return true;
5237}
5238
716d51ab
GN		 5239static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
5240static int complete_emulated_pio(struct kvm_vcpu *vcpu);
5241
4a1e10d5
PB		 5242static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
5243 unsigned long *db)
5244{
5245 u32 dr6 = 0;
5246 int i;
5247 u32 enable, rwlen;
5248
5249 enable = dr7;
5250 rwlen = dr7 >> 16;
5251 for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4)
5252 if ((enable & 3) && (rwlen & 15) == type && db[i] == addr)
5253 dr6 |= (1 << i);
5254 return dr6;
5255}
5256
6addfc42 5257static void kvm_vcpu_check_singlestep(struct kvm_vcpu *vcpu, unsigned long rflags, int *r)
663f4c61
PB		 5258{
5259 struct kvm_run *kvm_run = vcpu->run;
5260
5261 /*
6addfc42
PB		 5262 * rflags is the old, "raw" value of the flags. The new value has
5263 * not been saved yet.
663f4c61
PB		 5264 *
5265 * This is correct even for TF set by the guest, because "the
5266 * processor will not generate this exception after the instruction
5267 * that sets the TF flag".
5268 */
663f4c61
PB		 5269 if (unlikely(rflags & X86_EFLAGS_TF)) {
5270 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP) {
6f43ed01
NA		 5271 kvm_run->debug.arch.dr6 = DR6_BS | DR6_FIXED_1 |
5272 DR6_RTM;
663f4c61
PB		 5273 kvm_run->debug.arch.pc = vcpu->arch.singlestep_rip;
5274 kvm_run->debug.arch.exception = DB_VECTOR;
5275 kvm_run->exit_reason = KVM_EXIT_DEBUG;
5276 *r = EMULATE_USER_EXIT;
5277 } else {
5278 vcpu->arch.emulate_ctxt.eflags &= ~X86_EFLAGS_TF;
5279 /*
5280 * "Certain debug exceptions may clear bit 0-3. The
5281 * remaining contents of the DR6 register are never
5282 * cleared by the processor".
5283 */
5284 vcpu->arch.dr6 &= ~15;
6f43ed01 5285 vcpu->arch.dr6 |= DR6_BS | DR6_RTM;
663f4c61
PB		 5286 kvm_queue_exception(vcpu, DB_VECTOR);
5287 }
5288 }
5289}
5290
4a1e10d5
PB		 5291static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r)
5292{
4a1e10d5
PB		 5293 if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) &&
5294 (vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) {
82b32774
NA		 5295 struct kvm_run *kvm_run = vcpu->run;
5296 unsigned long eip = kvm_get_linear_rip(vcpu);
5297 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
4a1e10d5
PB		 5298 vcpu->arch.guest_debug_dr7,
5299 vcpu->arch.eff_db);
5300
5301 if (dr6 != 0) {
6f43ed01 5302 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1 | DR6_RTM;
82b32774 5303 kvm_run->debug.arch.pc = eip;
4a1e10d5
PB		 5304 kvm_run->debug.arch.exception = DB_VECTOR;
5305 kvm_run->exit_reason = KVM_EXIT_DEBUG;
5306 *r = EMULATE_USER_EXIT;
5307 return true;
5308 }
5309 }
5310
4161a569
NA		 5311 if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK) &&
5312 !(kvm_get_rflags(vcpu) & X86_EFLAGS_RF)) {
82b32774
NA		 5313 unsigned long eip = kvm_get_linear_rip(vcpu);
5314 u32 dr6 = kvm_vcpu_check_hw_bp(eip, 0,
4a1e10d5
PB		 5315 vcpu->arch.dr7,
5316 vcpu->arch.db);
5317
5318 if (dr6 != 0) {
5319 vcpu->arch.dr6 &= ~15;
6f43ed01 5320 vcpu->arch.dr6 |= dr6 | DR6_RTM;
4a1e10d5
PB		 5321 kvm_queue_exception(vcpu, DB_VECTOR);
5322 *r = EMULATE_DONE;
5323 return true;
5324 }
5325 }
5326
5327 return false;
5328}
5329
51d8b661
AP		 5330int x86_emulate_instruction(struct kvm_vcpu *vcpu,
5331 unsigned long cr2,
dc25e89e
AP		 5332 int emulation_type,
5333 void *insn,
5334 int insn_len)
bbd9b64e 5335{
95cb2295 5336 int r;
9d74191a 5337 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
7ae441ea 5338 bool writeback = true;
93c05d3e 5339 bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
bbd9b64e 5340
93c05d3e
XG		 5341 /*
5342 * Clear write_fault_to_shadow_pgtable here to ensure it is
5343 * never reused.
5344 */
5345 vcpu->arch.write_fault_to_shadow_pgtable = false;
26eef70c 5346 kvm_clear_exception_queue(vcpu);
8d7d8102 5347
571008da 5348 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
8ec4722d 5349 init_emulate_ctxt(vcpu);
4a1e10d5
PB		 5350
5351 /*
5352 * We will reenter on the same instruction since
5353 * we do not set complete_userspace_io. This does not
5354 * handle watchpoints yet, those would be handled in
5355 * the emulate_ops.
5356 */
5357 if (kvm_vcpu_check_breakpoint(vcpu, &r))
5358 return r;
5359
9d74191a
TY		 5360 ctxt->interruptibility = 0;
5361 ctxt->have_exception = false;
e0ad0b47 5362 ctxt->exception.vector = -1;
9d74191a 5363 ctxt->perm_ok = false;
bbd9b64e 5364
b51e974f 5365 ctxt->ud = emulation_type & EMULTYPE_TRAP_UD;
4005996e 5366
9d74191a 5367 r = x86_decode_insn(ctxt, insn, insn_len);
bbd9b64e 5368
e46479f8 5369 trace_kvm_emulate_insn_start(vcpu);
f2b5756b 5370 ++vcpu->stat.insn_emulation;
1d2887e2 5371 if (r != EMULATION_OK) {
4005996e
AK		 5372 if (emulation_type & EMULTYPE_TRAP_UD)
5373 return EMULATE_FAIL;
991eebf9
GN		 5374 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
5375 emulation_type))
bbd9b64e 5376 return EMULATE_DONE;
6d77dbfc
GN		 5377 if (emulation_type & EMULTYPE_SKIP)
5378 return EMULATE_FAIL;
5379 return handle_emulation_failure(vcpu);
bbd9b64e
CO		 5380 }
5381 }
5382
ba8afb6b 5383 if (emulation_type & EMULTYPE_SKIP) {
9dac77fa 5384 kvm_rip_write(vcpu, ctxt->_eip);
bb663c7a
NA		 5385 if (ctxt->eflags & X86_EFLAGS_RF)
5386 kvm_set_rflags(vcpu, ctxt->eflags & ~X86_EFLAGS_RF);
ba8afb6b
GN		 5387 return EMULATE_DONE;
5388 }
5389
1cb3f3ae
XG		 5390 if (retry_instruction(ctxt, cr2, emulation_type))
5391 return EMULATE_DONE;
5392
7ae441ea 5393 /* this is needed for vmware backdoor interface to work since it
4d2179e1 5394 changes registers values during IO operation */
7ae441ea
GN		 5395 if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
5396 vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
dd856efa 5397 emulator_invalidate_register_cache(ctxt);
7ae441ea 5398 }
4d2179e1 5399
5cd21917 5400restart:
9d74191a 5401 r = x86_emulate_insn(ctxt);
bbd9b64e 5402
775fde86
JR		 5403 if (r == EMULATION_INTERCEPTED)
5404 return EMULATE_DONE;
5405
d2ddd1c4 5406 if (r == EMULATION_FAILED) {
991eebf9
GN		 5407 if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
5408 emulation_type))
c3cd7ffa
GN		 5409 return EMULATE_DONE;
5410
6d77dbfc 5411 return handle_emulation_failure(vcpu);
bbd9b64e
CO		 5412 }
5413
9d74191a 5414 if (ctxt->have_exception) {
d2ddd1c4 5415 r = EMULATE_DONE;
ef54bcfe
PB		 5416 if (inject_emulated_exception(vcpu))
5417 return r;
d2ddd1c4 5418 } else if (vcpu->arch.pio.count) {
0912c977
PB		 5419 if (!vcpu->arch.pio.in) {
5420 /* FIXME: return into emulator if single-stepping. */
3457e419 5421 vcpu->arch.pio.count = 0;
0912c977 5422 } else {
7ae441ea 5423 writeback = false;
716d51ab
GN		 5424 vcpu->arch.complete_userspace_io = complete_emulated_pio;
5425 }
ac0a48c3 5426 r = EMULATE_USER_EXIT;
7ae441ea
GN		 5427 } else if (vcpu->mmio_needed) {
5428 if (!vcpu->mmio_is_write)
5429 writeback = false;
ac0a48c3 5430 r = EMULATE_USER_EXIT;
716d51ab 5431 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
7ae441ea 5432 } else if (r == EMULATION_RESTART)
5cd21917 5433 goto restart;
d2ddd1c4
GN		 5434 else
5435 r = EMULATE_DONE;
f850e2e6 5436
7ae441ea 5437 if (writeback) {
6addfc42 5438 unsigned long rflags = kvm_x86_ops->get_rflags(vcpu);
9d74191a 5439 toggle_interruptibility(vcpu, ctxt->interruptibility);
7ae441ea 5440 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
9d74191a 5441 kvm_rip_write(vcpu, ctxt->eip);
663f4c61 5442 if (r == EMULATE_DONE)
6addfc42 5443 kvm_vcpu_check_singlestep(vcpu, rflags, &r);
38827dbd
NA		 5444 if (!ctxt->have_exception ||
5445 exception_type(ctxt->exception.vector) == EXCPT_TRAP)
5446 __kvm_set_rflags(vcpu, ctxt->eflags);
6addfc42
PB		 5447
5448 /*
5449 * For STI, interrupts are shadowed; so KVM_REQ_EVENT will
5450 * do nothing, and it will be requested again as soon as
5451 * the shadow expires. But we still need to check here,
5452 * because POPF has no interrupt shadow.
5453 */
5454 if (unlikely((ctxt->eflags & ~rflags) & X86_EFLAGS_IF))
5455 kvm_make_request(KVM_REQ_EVENT, vcpu);
7ae441ea
GN		 5456 } else
5457 vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
e85d28f8
GN		 5458
5459 return r;
de7d789a 5460}
51d8b661 5461EXPORT_SYMBOL_GPL(x86_emulate_instruction);
de7d789a 5462
cf8f70bf 5463int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
de7d789a 5464{
cf8f70bf 5465 unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
ca1d4a9e
AK		 5466 int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
5467 size, port, &val, 1);
cf8f70bf 5468 /* do not return to emulator after return from userspace */
7972995b 5469 vcpu->arch.pio.count = 0;
de7d789a
CO		 5470 return ret;
5471}
cf8f70bf 5472EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
de7d789a 5473
8cfdc000
ZA		 5474static void tsc_bad(void *info)
5475{
0a3aee0d 5476 __this_cpu_write(cpu_tsc_khz, 0);
8cfdc000
ZA		 5477}
5478
5479static void tsc_khz_changed(void *data)
c8076604 5480{
8cfdc000
ZA		 5481 struct cpufreq_freqs *freq = data;
5482 unsigned long khz = 0;
5483
5484 if (data)
5485 khz = freq->new;
5486 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
5487 khz = cpufreq_quick_get(raw_smp_processor_id());
5488 if (!khz)
5489 khz = tsc_khz;
0a3aee0d 5490 __this_cpu_write(cpu_tsc_khz, khz);
c8076604
GH		 5491}
5492
c8076604
GH		 5493static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
5494 void *data)
5495{
5496 struct cpufreq_freqs *freq = data;
5497 struct kvm *kvm;
5498 struct kvm_vcpu *vcpu;
5499 int i, send_ipi = 0;
5500
8cfdc000
ZA		 5501 /*
5502 * We allow guests to temporarily run on slowing clocks,
5503 * provided we notify them after, or to run on accelerating
5504 * clocks, provided we notify them before. Thus time never
5505 * goes backwards.
5506 *
5507 * However, we have a problem. We can't atomically update
5508 * the frequency of a given CPU from this function; it is
5509 * merely a notifier, which can be called from any CPU.
5510 * Changing the TSC frequency at arbitrary points in time
5511 * requires a recomputation of local variables related to
5512 * the TSC for each VCPU. We must flag these local variables
5513 * to be updated and be sure the update takes place with the
5514 * new frequency before any guests proceed.
5515 *
5516 * Unfortunately, the combination of hotplug CPU and frequency
5517 * change creates an intractable locking scenario; the order
5518 * of when these callouts happen is undefined with respect to
5519 * CPU hotplug, and they can race with each other. As such,
5520 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
5521 * undefined; you can actually have a CPU frequency change take
5522 * place in between the computation of X and the setting of the
5523 * variable. To protect against this problem, all updates of
5524 * the per_cpu tsc_khz variable are done in an interrupt
5525 * protected IPI, and all callers wishing to update the value
5526 * must wait for a synchronous IPI to complete (which is trivial
5527 * if the caller is on the CPU already). This establishes the
5528 * necessary total order on variable updates.
5529 *
5530 * Note that because a guest time update may take place
5531 * anytime after the setting of the VCPU's request bit, the
5532 * correct TSC value must be set before the request. However,
5533 * to ensure the update actually makes it to any guest which
5534 * starts running in hardware virtualization between the set
5535 * and the acquisition of the spinlock, we must also ping the
5536 * CPU after setting the request bit.
5537 *
5538 */
5539
c8076604
GH		 5540 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
5541 return 0;
5542 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
5543 return 0;
8cfdc000
ZA		 5544
5545 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
c8076604 5546
2f303b74 5547 spin_lock(&kvm_lock);
c8076604 5548 list_for_each_entry(kvm, &vm_list, vm_list) {
988a2cae 5549 kvm_for_each_vcpu(i, vcpu, kvm) {
c8076604
GH		 5550 if (vcpu->cpu != freq->cpu)
5551 continue;
c285545f 5552 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
c8076604 5553 if (vcpu->cpu != smp_processor_id())
8cfdc000 5554 send_ipi = 1;
c8076604
GH		 5555 }
5556 }
2f303b74 5557 spin_unlock(&kvm_lock);
c8076604
GH		 5558
5559 if (freq->old < freq->new && send_ipi) {
5560 /*
5561 * We upscale the frequency. Must make the guest
5562 * doesn't see old kvmclock values while running with
5563 * the new frequency, otherwise we risk the guest sees
5564 * time go backwards.
5565 *
5566 * In case we update the frequency for another cpu
5567 * (which might be in guest context) send an interrupt
5568 * to kick the cpu out of guest context. Next time
5569 * guest context is entered kvmclock will be updated,
5570 * so the guest will not see stale values.
5571 */
8cfdc000 5572 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
c8076604
GH		 5573 }
5574 return 0;
5575}
5576
5577static struct notifier_block kvmclock_cpufreq_notifier_block = {
8cfdc000
ZA		 5578 .notifier_call = kvmclock_cpufreq_notifier
5579};
5580
5581static int kvmclock_cpu_notifier(struct notifier_block *nfb,
5582 unsigned long action, void *hcpu)
5583{
5584 unsigned int cpu = (unsigned long)hcpu;
5585
5586 switch (action) {
5587 case CPU_ONLINE:
5588 case CPU_DOWN_FAILED:
5589 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
5590 break;
5591 case CPU_DOWN_PREPARE:
5592 smp_call_function_single(cpu, tsc_bad, NULL, 1);
5593 break;
5594 }
5595 return NOTIFY_OK;
5596}
5597
5598static struct notifier_block kvmclock_cpu_notifier_block = {
5599 .notifier_call = kvmclock_cpu_notifier,
5600 .priority = -INT_MAX
c8076604
GH		 5601};
5602
b820cc0c
ZA		 5603static void kvm_timer_init(void)
5604{
5605 int cpu;
5606
c285545f 5607 max_tsc_khz = tsc_khz;
460dd42e
SB		 5608
5609 cpu_notifier_register_begin();
b820cc0c 5610 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
c285545f
ZA		 5611#ifdef CONFIG_CPU_FREQ
5612 struct cpufreq_policy policy;
5613 memset(&policy, 0, sizeof(policy));
3e26f230
AK		 5614 cpu = get_cpu();
5615 cpufreq_get_policy(&policy, cpu);
c285545f
ZA		 5616 if (policy.cpuinfo.max_freq)
5617 max_tsc_khz = policy.cpuinfo.max_freq;
3e26f230 5618 put_cpu();
c285545f 5619#endif
b820cc0c
ZA		 5620 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
5621 CPUFREQ_TRANSITION_NOTIFIER);
5622 }
c285545f 5623 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
8cfdc000
ZA		 5624 for_each_online_cpu(cpu)
5625 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
460dd42e
SB		 5626
5627 __register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
5628 cpu_notifier_register_done();
5629
b820cc0c
ZA		 5630}
5631
ff9d07a0
ZY		 5632static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
5633
f5132b01 5634int kvm_is_in_guest(void)
ff9d07a0 5635{
086c9855 5636 return __this_cpu_read(current_vcpu) != NULL;
ff9d07a0
ZY		 5637}
5638
5639static int kvm_is_user_mode(void)
5640{
5641 int user_mode = 3;
dcf46b94 5642
086c9855
AS		 5643 if (__this_cpu_read(current_vcpu))
5644 user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu));
dcf46b94 5645
ff9d07a0
ZY		 5646 return user_mode != 0;
5647}
5648
5649static unsigned long kvm_get_guest_ip(void)
5650{
5651 unsigned long ip = 0;
dcf46b94 5652
086c9855
AS		 5653 if (__this_cpu_read(current_vcpu))
5654 ip = kvm_rip_read(__this_cpu_read(current_vcpu));
dcf46b94 5655
ff9d07a0
ZY		 5656 return ip;
5657}
5658
5659static struct perf_guest_info_callbacks kvm_guest_cbs = {
5660 .is_in_guest = kvm_is_in_guest,
5661 .is_user_mode = kvm_is_user_mode,
5662 .get_guest_ip = kvm_get_guest_ip,
5663};
5664
5665void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
5666{
086c9855 5667 __this_cpu_write(current_vcpu, vcpu);
ff9d07a0
ZY		 5668}
5669EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
5670
5671void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
5672{
086c9855 5673 __this_cpu_write(current_vcpu, NULL);
ff9d07a0
ZY		 5674}
5675EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
5676
ce88decf
XG		 5677static void kvm_set_mmio_spte_mask(void)
5678{
5679 u64 mask;
5680 int maxphyaddr = boot_cpu_data.x86_phys_bits;
5681
5682 /*
5683 * Set the reserved bits and the present bit of an paging-structure
5684 * entry to generate page fault with PFER.RSV = 1.
5685 */
885032b9 5686 /* Mask the reserved physical address bits. */
d1431483 5687 mask = rsvd_bits(maxphyaddr, 51);
885032b9
XG		 5688
5689 /* Bit 62 is always reserved for 32bit host. */
5690 mask |= 0x3ull << 62;
5691
5692 /* Set the present bit. */
ce88decf
XG		 5693 mask |= 1ull;
5694
5695#ifdef CONFIG_X86_64
5696 /*
5697 * If reserved bit is not supported, clear the present bit to disable
5698 * mmio page fault.
5699 */
5700 if (maxphyaddr == 52)
5701 mask &= ~1ull;
5702#endif
5703
5704 kvm_mmu_set_mmio_spte_mask(mask);
5705}
5706
16e8d74d
MT		 5707#ifdef CONFIG_X86_64
5708static void pvclock_gtod_update_fn(struct work_struct *work)
5709{
d828199e
MT		 5710 struct kvm *kvm;
5711
5712 struct kvm_vcpu *vcpu;
5713 int i;
5714
2f303b74 5715 spin_lock(&kvm_lock);
d828199e
MT		 5716 list_for_each_entry(kvm, &vm_list, vm_list)
5717 kvm_for_each_vcpu(i, vcpu, kvm)
105b21bb 5718 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
d828199e 5719 atomic_set(&kvm_guest_has_master_clock, 0);
2f303b74 5720 spin_unlock(&kvm_lock);
16e8d74d
MT		 5721}
5722
5723static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn);
5724
5725/*
5726 * Notification about pvclock gtod data update.
5727 */
5728static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused,
5729 void *priv)
5730{
5731 struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
5732 struct timekeeper *tk = priv;
5733
5734 update_pvclock_gtod(tk);
5735
5736 /* disable master clock if host does not trust, or does not
5737 * use, TSC clocksource
5738 */
5739 if (gtod->clock.vclock_mode != VCLOCK_TSC &&
5740 atomic_read(&kvm_guest_has_master_clock) != 0)
5741 queue_work(system_long_wq, &pvclock_gtod_work);
5742
5743 return 0;
5744}
5745
5746static struct notifier_block pvclock_gtod_notifier = {
5747 .notifier_call = pvclock_gtod_notify,
5748};
5749#endif
5750
f8c16bba 5751int kvm_arch_init(void *opaque)
043405e1 5752{
b820cc0c 5753 int r;
6b61edf7 5754 struct kvm_x86_ops *ops = opaque;
f8c16bba 5755
f8c16bba
ZX		 5756 if (kvm_x86_ops) {
5757 printk(KERN_ERR "kvm: already loaded the other module\n");
56c6d28a
ZX		 5758 r = -EEXIST;
5759 goto out;
f8c16bba
ZX		 5760 }
5761
5762 if (!ops->cpu_has_kvm_support()) {
5763 printk(KERN_ERR "kvm: no hardware support\n");
56c6d28a
ZX		 5764 r = -EOPNOTSUPP;
5765 goto out;
f8c16bba
ZX		 5766 }
5767 if (ops->disabled_by_bios()) {
5768 printk(KERN_ERR "kvm: disabled by bios\n");
56c6d28a
ZX		 5769 r = -EOPNOTSUPP;
5770 goto out;
f8c16bba
ZX		 5771 }
5772
013f6a5d
MT		 5773 r = -ENOMEM;
5774 shared_msrs = alloc_percpu(struct kvm_shared_msrs);
5775 if (!shared_msrs) {
5776 printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n");
5777 goto out;
5778 }
5779
97db56ce
AK		 5780 r = kvm_mmu_module_init();
5781 if (r)
013f6a5d 5782 goto out_free_percpu;
97db56ce 5783
ce88decf 5784 kvm_set_mmio_spte_mask();
97db56ce 5785
f8c16bba 5786 kvm_x86_ops = ops;
920c8377
PB		 5787 kvm_init_msr_list();
5788
7b52345e 5789 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4b12f0de 5790 PT_DIRTY_MASK, PT64_NX_MASK, 0);
c8076604 5791
b820cc0c 5792 kvm_timer_init();
c8076604 5793
ff9d07a0
ZY		 5794 perf_register_guest_info_callbacks(&kvm_guest_cbs);
5795
2acf923e
DC		 5796 if (cpu_has_xsave)
5797 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
5798
c5cc421b 5799 kvm_lapic_init();
16e8d74d
MT		 5800#ifdef CONFIG_X86_64
5801 pvclock_gtod_register_notifier(&pvclock_gtod_notifier);
5802#endif
5803
f8c16bba 5804 return 0;
56c6d28a 5805
013f6a5d
MT		 5806out_free_percpu:
5807 free_percpu(shared_msrs);
56c6d28a 5808out:
56c6d28a 5809 return r;
043405e1 5810}
8776e519 5811
f8c16bba
ZX		 5812void kvm_arch_exit(void)
5813{
ff9d07a0
ZY		 5814 perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
5815
888d256e
JK		 5816 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
5817 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
5818 CPUFREQ_TRANSITION_NOTIFIER);
8cfdc000 5819 unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
16e8d74d
MT		 5820#ifdef CONFIG_X86_64
5821 pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier);
5822#endif
f8c16bba 5823 kvm_x86_ops = NULL;
56c6d28a 5824 kvm_mmu_module_exit();
013f6a5d 5825 free_percpu(shared_msrs);
56c6d28a 5826}
f8c16bba 5827
5cb56059 5828int kvm_vcpu_halt(struct kvm_vcpu *vcpu)
8776e519
HB		 5829{
5830 ++vcpu->stat.halt_exits;
5831 if (irqchip_in_kernel(vcpu->kvm)) {
a4535290 5832 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
8776e519
HB		 5833 return 1;
5834 } else {
5835 vcpu->run->exit_reason = KVM_EXIT_HLT;
5836 return 0;
5837 }
5838}
5cb56059
JS		 5839EXPORT_SYMBOL_GPL(kvm_vcpu_halt);
5840
5841int kvm_emulate_halt(struct kvm_vcpu *vcpu)
5842{
5843 kvm_x86_ops->skip_emulated_instruction(vcpu);
5844 return kvm_vcpu_halt(vcpu);
5845}
8776e519
HB		 5846EXPORT_SYMBOL_GPL(kvm_emulate_halt);
5847
55cd8e5a
GN		 5848int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
5849{
5850 u64 param, ingpa, outgpa, ret;
5851 uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
5852 bool fast, longmode;
55cd8e5a
GN		 5853
5854 /*
5855 * hypercall generates UD from non zero cpl and real mode
5856 * per HYPER-V spec
5857 */
3eeb3288 5858 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
55cd8e5a
GN		 5859 kvm_queue_exception(vcpu, UD_VECTOR);
5860 return 0;
5861 }
5862
a449c7aa 5863 longmode = is_64_bit_mode(vcpu);
55cd8e5a
GN		 5864
5865 if (!longmode) {
ccd46936
GN		 5866 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
5867 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
5868 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
5869 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
5870 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
5871 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
55cd8e5a
GN		 5872 }
5873#ifdef CONFIG_X86_64
5874 else {
5875 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
5876 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
5877 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
5878 }
5879#endif
5880
5881 code = param & 0xffff;
5882 fast = (param >> 16) & 0x1;
5883 rep_cnt = (param >> 32) & 0xfff;
5884 rep_idx = (param >> 48) & 0xfff;
5885
5886 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
5887
c25bc163
GN		 5888 switch (code) {
5889 case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
5890 kvm_vcpu_on_spin(vcpu);
5891 break;
5892 default:
5893 res = HV_STATUS_INVALID_HYPERCALL_CODE;
5894 break;
5895 }
55cd8e5a
GN		 5896
5897 ret = res | (((u64)rep_done & 0xfff) << 32);
5898 if (longmode) {
5899 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
5900 } else {
5901 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
5902 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
5903 }
5904
5905 return 1;
5906}
5907
6aef266c
SV		 5908/*
5909 * kvm_pv_kick_cpu_op: Kick a vcpu.
5910 *
5911 * @apicid - apicid of vcpu to be kicked.
5912 */
5913static void kvm_pv_kick_cpu_op(struct kvm *kvm, unsigned long flags, int apicid)
5914{
24d2166b 5915 struct kvm_lapic_irq lapic_irq;
6aef266c 5916
24d2166b
R		 5917 lapic_irq.shorthand = 0;
5918 lapic_irq.dest_mode = 0;
5919 lapic_irq.dest_id = apicid;
6aef266c 5920
24d2166b
R		 5921 lapic_irq.delivery_mode = APIC_DM_REMRD;
5922 kvm_irq_delivery_to_apic(kvm, 0, &lapic_irq, NULL);
6aef266c
SV		 5923}
5924
8776e519
HB		 5925int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
5926{
5927 unsigned long nr, a0, a1, a2, a3, ret;
a449c7aa 5928 int op_64_bit, r = 1;
8776e519 5929
5cb56059
JS		 5930 kvm_x86_ops->skip_emulated_instruction(vcpu);
5931
55cd8e5a
GN		 5932 if (kvm_hv_hypercall_enabled(vcpu->kvm))
5933 return kvm_hv_hypercall(vcpu);
5934
5fdbf976
MT		 5935 nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
5936 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
5937 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
5938 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
5939 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
8776e519 5940
229456fc 5941 trace_kvm_hypercall(nr, a0, a1, a2, a3);
2714d1d3 5942
a449c7aa
NA		 5943 op_64_bit = is_64_bit_mode(vcpu);
5944 if (!op_64_bit) {
8776e519
HB		 5945 nr &= 0xFFFFFFFF;
5946 a0 &= 0xFFFFFFFF;
5947 a1 &= 0xFFFFFFFF;
5948 a2 &= 0xFFFFFFFF;
5949 a3 &= 0xFFFFFFFF;
5950 }
5951
07708c4a
JK		 5952 if (kvm_x86_ops->get_cpl(vcpu) != 0) {
5953 ret = -KVM_EPERM;
5954 goto out;
5955 }
5956
8776e519 5957 switch (nr) {
b93463aa
AK		 5958 case KVM_HC_VAPIC_POLL_IRQ:
5959 ret = 0;
5960 break;
6aef266c
SV		 5961 case KVM_HC_KICK_CPU:
5962 kvm_pv_kick_cpu_op(vcpu->kvm, a0, a1);
5963 ret = 0;
5964 break;
8776e519
HB		 5965 default:
5966 ret = -KVM_ENOSYS;
5967 break;
5968 }
07708c4a 5969out:
a449c7aa
NA		 5970 if (!op_64_bit)
5971 ret = (u32)ret;
5fdbf976 5972 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
f11c3a8d 5973 ++vcpu->stat.hypercalls;
2f333bcb 5974 return r;
8776e519
HB		 5975}
5976EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
5977
b6785def 5978static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
8776e519 5979{
d6aa1000 5980 struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
8776e519 5981 char instruction[3];
5fdbf976 5982 unsigned long rip = kvm_rip_read(vcpu);
8776e519 5983
8776e519 5984 kvm_x86_ops->patch_hypercall(vcpu, instruction);
8776e519 5985
9d74191a 5986 return emulator_write_emulated(ctxt, rip, instruction, 3, NULL);
8776e519
HB		 5987}
5988
b6c7a5dc
HB		 5989/*
5990 * Check if userspace requested an interrupt window, and that the
5991 * interrupt window is open.
5992 *
5993 * No need to exit to userspace if we already have an interrupt queued.
5994 */
851ba692 5995static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
b6c7a5dc 5996{
8061823a 5997 return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
851ba692 5998 vcpu->run->request_interrupt_window &&
5df56646 5999 kvm_arch_interrupt_allowed(vcpu));
b6c7a5dc
HB		 6000}
6001
851ba692 6002static void post_kvm_run_save(struct kvm_vcpu *vcpu)
b6c7a5dc 6003{
851ba692
AK		 6004 struct kvm_run *kvm_run = vcpu->run;
6005
91586a3b 6006 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2d3ad1f4 6007 kvm_run->cr8 = kvm_get_cr8(vcpu);
b6c7a5dc 6008 kvm_run->apic_base = kvm_get_apic_base(vcpu);
4531220b 6009 if (irqchip_in_kernel(vcpu->kvm))
b6c7a5dc 6010 kvm_run->ready_for_interrupt_injection = 1;
4531220b 6011 else
b6c7a5dc 6012 kvm_run->ready_for_interrupt_injection =
fa9726b0
GN		 6013 kvm_arch_interrupt_allowed(vcpu) &&
6014 !kvm_cpu_has_interrupt(vcpu) &&
6015 !kvm_event_needs_reinjection(vcpu);
b6c7a5dc
HB		 6016}
6017
95ba8273
GN		 6018static void update_cr8_intercept(struct kvm_vcpu *vcpu)
6019{
6020 int max_irr, tpr;
6021
6022 if (!kvm_x86_ops->update_cr8_intercept)
6023 return;
6024
88c808fd
AK		 6025 if (!vcpu->arch.apic)
6026 return;
6027
8db3baa2
GN		 6028 if (!vcpu->arch.apic->vapic_addr)
6029 max_irr = kvm_lapic_find_highest_irr(vcpu);
6030 else
6031 max_irr = -1;
95ba8273
GN		 6032
6033 if (max_irr != -1)
6034 max_irr >>= 4;
6035
6036 tpr = kvm_lapic_get_cr8(vcpu);
6037
6038 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
6039}
6040
b6b8a145 6041static int inject_pending_event(struct kvm_vcpu *vcpu, bool req_int_win)
95ba8273 6042{
b6b8a145
JK		 6043 int r;
6044
95ba8273 6045 /* try to reinject previous events if any */
b59bb7bd 6046 if (vcpu->arch.exception.pending) {
5c1c85d0
AK		 6047 trace_kvm_inj_exception(vcpu->arch.exception.nr,
6048 vcpu->arch.exception.has_error_code,
6049 vcpu->arch.exception.error_code);
d6e8c854
NA		 6050
6051 if (exception_type(vcpu->arch.exception.nr) == EXCPT_FAULT)
6052 __kvm_set_rflags(vcpu, kvm_get_rflags(vcpu) |
6053 X86_EFLAGS_RF);
6054
6bdf0662
NA		 6055 if (vcpu->arch.exception.nr == DB_VECTOR &&
6056 (vcpu->arch.dr7 & DR7_GD)) {
6057 vcpu->arch.dr7 &= ~DR7_GD;
6058 kvm_update_dr7(vcpu);
6059 }
6060
b59bb7bd
GN		 6061 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
6062 vcpu->arch.exception.has_error_code,
ce7ddec4
JR		 6063 vcpu->arch.exception.error_code,
6064 vcpu->arch.exception.reinject);
b6b8a145 6065 return 0;
b59bb7bd
GN		 6066 }
6067
95ba8273
GN		 6068 if (vcpu->arch.nmi_injected) {
6069 kvm_x86_ops->set_nmi(vcpu);
b6b8a145 6070 return 0;
95ba8273
GN		 6071 }
6072
6073 if (vcpu->arch.interrupt.pending) {
66fd3f7f 6074 kvm_x86_ops->set_irq(vcpu);
b6b8a145
JK		 6075 return 0;
6076 }
6077
6078 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) {
6079 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win);
6080 if (r != 0)
6081 return r;
95ba8273
GN		 6082 }
6083
6084 /* try to inject new event if pending */
6085 if (vcpu->arch.nmi_pending) {
6086 if (kvm_x86_ops->nmi_allowed(vcpu)) {
7460fb4a 6087 --vcpu->arch.nmi_pending;
95ba8273
GN		 6088 vcpu->arch.nmi_injected = true;
6089 kvm_x86_ops->set_nmi(vcpu);
6090 }
c7c9c56c 6091 } else if (kvm_cpu_has_injectable_intr(vcpu)) {
9242b5b6
BD		 6092 /*
6093 * Because interrupts can be injected asynchronously, we are
6094 * calling check_nested_events again here to avoid a race condition.
6095 * See https://lkml.org/lkml/2014/7/2/60 for discussion about this
6096 * proposal and current concerns. Perhaps we should be setting
6097 * KVM_REQ_EVENT only on certain events and not unconditionally?
6098 */
6099 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events) {
6100 r = kvm_x86_ops->check_nested_events(vcpu, req_int_win);
6101 if (r != 0)
6102 return r;
6103 }
95ba8273 6104 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
66fd3f7f
GN		 6105 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
6106 false);
6107 kvm_x86_ops->set_irq(vcpu);
95ba8273
GN		 6108 }
6109 }
b6b8a145 6110 return 0;
95ba8273
GN		 6111}
6112
7460fb4a
AK		 6113static void process_nmi(struct kvm_vcpu *vcpu)
6114{
6115 unsigned limit = 2;
6116
6117 /*
6118 * x86 is limited to one NMI running, and one NMI pending after it.
6119 * If an NMI is already in progress, limit further NMIs to just one.
6120 * Otherwise, allow two (and we'll inject the first one immediately).
6121 */
6122 if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected)
6123 limit = 1;
6124
6125 vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
6126 vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
6127 kvm_make_request(KVM_REQ_EVENT, vcpu);
6128}
6129
3d81bc7e 6130static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
c7c9c56c
YZ		 6131{
6132 u64 eoi_exit_bitmap[4];
cf9e65b7 6133 u32 tmr[8];
c7c9c56c 6134
3d81bc7e
YZ		 6135 if (!kvm_apic_hw_enabled(vcpu->arch.apic))
6136 return;
c7c9c56c
YZ		 6137
6138 memset(eoi_exit_bitmap, 0, 32);
cf9e65b7 6139 memset(tmr, 0, 32);
c7c9c56c 6140
cf9e65b7 6141 kvm_ioapic_scan_entry(vcpu, eoi_exit_bitmap, tmr);
c7c9c56c 6142 kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
cf9e65b7 6143 kvm_apic_update_tmr(vcpu, tmr);
c7c9c56c
YZ		 6144}
6145
a70656b6
RK		 6146static void kvm_vcpu_flush_tlb(struct kvm_vcpu *vcpu)
6147{
6148 ++vcpu->stat.tlb_flush;
6149 kvm_x86_ops->tlb_flush(vcpu);
6150}
6151
4256f43f
TC		 6152void kvm_vcpu_reload_apic_access_page(struct kvm_vcpu *vcpu)
6153{
c24ae0dc
TC		 6154 struct page *page = NULL;
6155
f439ed27
PB		 6156 if (!irqchip_in_kernel(vcpu->kvm))
6157 return;
6158
4256f43f
TC		 6159 if (!kvm_x86_ops->set_apic_access_page_addr)
6160 return;
6161
c24ae0dc
TC		 6162 page = gfn_to_page(vcpu->kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
6163 kvm_x86_ops->set_apic_access_page_addr(vcpu, page_to_phys(page));
6164
6165 /*
6166 * Do not pin apic access page in memory, the MMU notifier
6167 * will call us again if it is migrated or swapped out.
6168 */
6169 put_page(page);
4256f43f
TC		 6170}
6171EXPORT_SYMBOL_GPL(kvm_vcpu_reload_apic_access_page);
6172
fe71557a
TC		 6173void kvm_arch_mmu_notifier_invalidate_page(struct kvm *kvm,
6174 unsigned long address)
6175{
c24ae0dc
TC		 6176 /*
6177 * The physical address of apic access page is stored in the VMCS.
6178 * Update it when it becomes invalid.
6179 */
6180 if (address == gfn_to_hva(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT))
6181 kvm_make_all_cpus_request(kvm, KVM_REQ_APIC_PAGE_RELOAD);
fe71557a
TC		 6182}
6183
9357d939
TY		 6184/*
6185 * Returns 1 to let __vcpu_run() continue the guest execution loop without
6186 * exiting to the userspace. Otherwise, the value will be returned to the
6187 * userspace.
6188 */
851ba692 6189static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
b6c7a5dc
HB		 6190{
6191 int r;
6a8b1d13 6192 bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
851ba692 6193 vcpu->run->request_interrupt_window;
730dca42 6194 bool req_immediate_exit = false;
b6c7a5dc 6195
3e007509 6196 if (vcpu->requests) {
a8eeb04a 6197 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
2e53d63a 6198 kvm_mmu_unload(vcpu);
a8eeb04a 6199 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
2f599714 6200 __kvm_migrate_timers(vcpu);
d828199e
MT		 6201 if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu))
6202 kvm_gen_update_masterclock(vcpu->kvm);
0061d53d
MT		 6203 if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu))
6204 kvm_gen_kvmclock_update(vcpu);
34c238a1
ZA		 6205 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
6206 r = kvm_guest_time_update(vcpu);
8cfdc000
ZA		 6207 if (unlikely(r))
6208 goto out;
6209 }
a8eeb04a 6210 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
4731d4c7 6211 kvm_mmu_sync_roots(vcpu);
a8eeb04a 6212 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
a70656b6 6213 kvm_vcpu_flush_tlb(vcpu);
a8eeb04a 6214 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
851ba692 6215 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
b93463aa
AK		 6216 r = 0;
6217 goto out;
6218 }
a8eeb04a 6219 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
851ba692 6220 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
71c4dfaf
JR		 6221 r = 0;
6222 goto out;
6223 }
a8eeb04a 6224 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
02daab21
AK		 6225 vcpu->fpu_active = 0;
6226 kvm_x86_ops->fpu_deactivate(vcpu);
6227 }
af585b92
GN		 6228 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
6229 /* Page is swapped out. Do synthetic halt */
6230 vcpu->arch.apf.halted = true;
6231 r = 1;
6232 goto out;
6233 }
c9aaa895
GC		 6234 if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
6235 record_steal_time(vcpu);
7460fb4a
AK		 6236 if (kvm_check_request(KVM_REQ_NMI, vcpu))
6237 process_nmi(vcpu);
f5132b01
GN		 6238 if (kvm_check_request(KVM_REQ_PMU, vcpu))
6239 kvm_handle_pmu_event(vcpu);
6240 if (kvm_check_request(KVM_REQ_PMI, vcpu))
6241 kvm_deliver_pmi(vcpu);
3d81bc7e
YZ		 6242 if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu))
6243 vcpu_scan_ioapic(vcpu);
4256f43f
TC		 6244 if (kvm_check_request(KVM_REQ_APIC_PAGE_RELOAD, vcpu))
6245 kvm_vcpu_reload_apic_access_page(vcpu);
2f52d58c 6246 }
b93463aa 6247
b463a6f7 6248 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
66450a21
JK		 6249 kvm_apic_accept_events(vcpu);
6250 if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
6251 r = 1;
6252 goto out;
6253 }
6254
b6b8a145
JK		 6255 if (inject_pending_event(vcpu, req_int_win) != 0)
6256 req_immediate_exit = true;
b463a6f7 6257 /* enable NMI/IRQ window open exits if needed */
b6b8a145 6258 else if (vcpu->arch.nmi_pending)
c9a7953f 6259 kvm_x86_ops->enable_nmi_window(vcpu);
c7c9c56c 6260 else if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win)
c9a7953f 6261 kvm_x86_ops->enable_irq_window(vcpu);
b463a6f7
AK		 6262
6263 if (kvm_lapic_enabled(vcpu)) {
c7c9c56c
YZ		 6264 /*
6265 * Update architecture specific hints for APIC
6266 * virtual interrupt delivery.
6267 */
6268 if (kvm_x86_ops->hwapic_irr_update)
6269 kvm_x86_ops->hwapic_irr_update(vcpu,
6270 kvm_lapic_find_highest_irr(vcpu));
b463a6f7
AK		 6271 update_cr8_intercept(vcpu);
6272 kvm_lapic_sync_to_vapic(vcpu);
6273 }
6274 }
6275
d8368af8
AK		 6276 r = kvm_mmu_reload(vcpu);
6277 if (unlikely(r)) {
d905c069 6278 goto cancel_injection;
d8368af8
AK		 6279 }
6280
b6c7a5dc
HB		 6281 preempt_disable();
6282
6283 kvm_x86_ops->prepare_guest_switch(vcpu);
2608d7a1
AK		 6284 if (vcpu->fpu_active)
6285 kvm_load_guest_fpu(vcpu);
2acf923e 6286 kvm_load_guest_xcr0(vcpu);
b6c7a5dc 6287
6b7e2d09
XG		 6288 vcpu->mode = IN_GUEST_MODE;
6289
01b71917
MT		 6290 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
6291
6b7e2d09
XG		 6292 /* We should set ->mode before check ->requests,
6293 * see the comment in make_all_cpus_request.
6294 */
01b71917 6295 smp_mb__after_srcu_read_unlock();
b6c7a5dc 6296
d94e1dc9 6297 local_irq_disable();
32f88400 6298
6b7e2d09 6299 if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
d94e1dc9 6300 || need_resched() || signal_pending(current)) {
6b7e2d09 6301 vcpu->mode = OUTSIDE_GUEST_MODE;
d94e1dc9 6302 smp_wmb();
6c142801
AK		 6303 local_irq_enable();
6304 preempt_enable();
01b71917 6305 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
6c142801 6306 r = 1;
d905c069 6307 goto cancel_injection;
6c142801
AK		 6308 }
6309
d6185f20
NHE		 6310 if (req_immediate_exit)
6311 smp_send_reschedule(vcpu->cpu);
6312
b6c7a5dc
HB		 6313 kvm_guest_enter();
6314
42dbaa5a 6315 if (unlikely(vcpu->arch.switch_db_regs)) {
42dbaa5a
JK		 6316 set_debugreg(0, 7);
6317 set_debugreg(vcpu->arch.eff_db[0], 0);
6318 set_debugreg(vcpu->arch.eff_db[1], 1);
6319 set_debugreg(vcpu->arch.eff_db[2], 2);
6320 set_debugreg(vcpu->arch.eff_db[3], 3);
c77fb5fe 6321 set_debugreg(vcpu->arch.dr6, 6);
42dbaa5a 6322 }
b6c7a5dc 6323
229456fc 6324 trace_kvm_entry(vcpu->vcpu_id);
d0659d94 6325 wait_lapic_expire(vcpu);
851ba692 6326 kvm_x86_ops->run(vcpu);
b6c7a5dc 6327
c77fb5fe
PB		 6328 /*
6329 * Do this here before restoring debug registers on the host. And
6330 * since we do this before handling the vmexit, a DR access vmexit
6331 * can (a) read the correct value of the debug registers, (b) set
6332 * KVM_DEBUGREG_WONT_EXIT again.
6333 */
6334 if (unlikely(vcpu->arch.switch_db_regs & KVM_DEBUGREG_WONT_EXIT)) {
6335 int i;
6336
6337 WARN_ON(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP);
6338 kvm_x86_ops->sync_dirty_debug_regs(vcpu);
6339 for (i = 0; i < KVM_NR_DB_REGS; i++)
6340 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
6341 }
6342
24f1e32c
FW		 6343 /*
6344 * If the guest has used debug registers, at least dr7
6345 * will be disabled while returning to the host.
6346 * If we don't have active breakpoints in the host, we don't
6347 * care about the messed up debug address registers. But if
6348 * we have some of them active, restore the old state.
6349 */
59d8eb53 6350 if (hw_breakpoint_active())
24f1e32c 6351 hw_breakpoint_restore();
42dbaa5a 6352
886b470c
MT		 6353 vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu,
6354 native_read_tsc());
1d5f066e 6355
6b7e2d09 6356 vcpu->mode = OUTSIDE_GUEST_MODE;
d94e1dc9 6357 smp_wmb();
a547c6db
YZ		 6358
6359 /* Interrupt is enabled by handle_external_intr() */
6360 kvm_x86_ops->handle_external_intr(vcpu);
b6c7a5dc
HB		 6361
6362 ++vcpu->stat.exits;
6363
6364 /*
6365 * We must have an instruction between local_irq_enable() and
6366 * kvm_guest_exit(), so the timer interrupt isn't delayed by
6367 * the interrupt shadow. The stat.exits increment will do nicely.
6368 * But we need to prevent reordering, hence this barrier():
6369 */
6370 barrier();
6371
6372 kvm_guest_exit();
6373
6374 preempt_enable();
6375
f656ce01 6376 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3200f405 6377
b6c7a5dc
HB		 6378 /*
6379 * Profile KVM exit RIPs:
6380 */
6381 if (unlikely(prof_on == KVM_PROFILING)) {
5fdbf976
MT		 6382 unsigned long rip = kvm_rip_read(vcpu);
6383 profile_hit(KVM_PROFILING, (void *)rip);
b6c7a5dc
HB		 6384 }
6385
cc578287
ZA		 6386 if (unlikely(vcpu->arch.tsc_always_catchup))
6387 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
298101da 6388
5cfb1d5a
MT		 6389 if (vcpu->arch.apic_attention)
6390 kvm_lapic_sync_from_vapic(vcpu);
b93463aa 6391
851ba692 6392 r = kvm_x86_ops->handle_exit(vcpu);
d905c069
MT		 6393 return r;
6394
6395cancel_injection:
6396 kvm_x86_ops->cancel_injection(vcpu);
ae7a2a3f
MT		 6397 if (unlikely(vcpu->arch.apic_attention))
6398 kvm_lapic_sync_from_vapic(vcpu);
d7690175
MT		 6399out:
6400 return r;
6401}
b6c7a5dc 6402
09cec754 6403
851ba692 6404static int __vcpu_run(struct kvm_vcpu *vcpu)
d7690175
MT		 6405{
6406 int r;
f656ce01 6407 struct kvm *kvm = vcpu->kvm;
d7690175 6408
f656ce01 6409 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
d7690175
MT		 6410
6411 r = 1;
6412 while (r > 0) {
af585b92
GN		 6413 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
6414 !vcpu->arch.apf.halted)
851ba692 6415 r = vcpu_enter_guest(vcpu);
d7690175 6416 else {
f656ce01 6417 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
d7690175 6418 kvm_vcpu_block(vcpu);
f656ce01 6419 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
66450a21
JK		 6420 if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) {
6421 kvm_apic_accept_events(vcpu);
09cec754
GN		 6422 switch(vcpu->arch.mp_state) {
6423 case KVM_MP_STATE_HALTED:
6aef266c 6424 vcpu->arch.pv.pv_unhalted = false;
d7690175 6425 vcpu->arch.mp_state =
09cec754
GN		 6426 KVM_MP_STATE_RUNNABLE;
6427 case KVM_MP_STATE_RUNNABLE:
af585b92 6428 vcpu->arch.apf.halted = false;
09cec754 6429 break;
66450a21
JK		 6430 case KVM_MP_STATE_INIT_RECEIVED:
6431 break;
09cec754
GN		 6432 default:
6433 r = -EINTR;
6434 break;
6435 }
6436 }
d7690175
MT		 6437 }
6438
09cec754
GN		 6439 if (r <= 0)
6440 break;
6441
6442 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
6443 if (kvm_cpu_has_pending_timer(vcpu))
6444 kvm_inject_pending_timer_irqs(vcpu);
6445
851ba692 6446 if (dm_request_for_irq_injection(vcpu)) {
09cec754 6447 r = -EINTR;
851ba692 6448 vcpu->run->exit_reason = KVM_EXIT_INTR;
09cec754
GN		 6449 ++vcpu->stat.request_irq_exits;
6450 }
af585b92
GN		 6451
6452 kvm_check_async_pf_completion(vcpu);
6453
09cec754
GN		 6454 if (signal_pending(current)) {
6455 r = -EINTR;
851ba692 6456 vcpu->run->exit_reason = KVM_EXIT_INTR;
09cec754
GN		 6457 ++vcpu->stat.signal_exits;
6458 }
6459 if (need_resched()) {
f656ce01 6460 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
c08ac06a 6461 cond_resched();
f656ce01 6462 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
d7690175 6463 }
b6c7a5dc
HB		 6464 }
6465
f656ce01 6466 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
b6c7a5dc
HB		 6467
6468 return r;
6469}
6470
716d51ab
GN		 6471static inline int complete_emulated_io(struct kvm_vcpu *vcpu)
6472{
6473 int r;
6474 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
6475 r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
6476 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
6477 if (r != EMULATE_DONE)
6478 return 0;
6479 return 1;
6480}
6481
6482static int complete_emulated_pio(struct kvm_vcpu *vcpu)
6483{
6484 BUG_ON(!vcpu->arch.pio.count);
6485
6486 return complete_emulated_io(vcpu);
6487}
6488
f78146b0
AK		 6489/*
6490 * Implements the following, as a state machine:
6491 *
6492 * read:
6493 * for each fragment
87da7e66
XG		 6494 * for each mmio piece in the fragment
6495 * write gpa, len
6496 * exit
6497 * copy data
f78146b0
AK		 6498 * execute insn
6499 *
6500 * write:
6501 * for each fragment
87da7e66
XG		 6502 * for each mmio piece in the fragment
6503 * write gpa, len
6504 * copy data
6505 * exit
f78146b0 6506 */
716d51ab 6507static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
5287f194
AK		 6508{
6509 struct kvm_run *run = vcpu->run;
f78146b0 6510 struct kvm_mmio_fragment *frag;
87da7e66 6511 unsigned len;
5287f194 6512
716d51ab 6513 BUG_ON(!vcpu->mmio_needed);
5287f194 6514
716d51ab 6515 /* Complete previous fragment */
87da7e66
XG		 6516 frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
6517 len = min(8u, frag->len);
716d51ab 6518 if (!vcpu->mmio_is_write)
87da7e66
XG		 6519 memcpy(frag->data, run->mmio.data, len);
6520
6521 if (frag->len <= 8) {
6522 /* Switch to the next fragment. */
6523 frag++;
6524 vcpu->mmio_cur_fragment++;
6525 } else {
6526 /* Go forward to the next mmio piece. */
6527 frag->data += len;
6528 frag->gpa += len;
6529 frag->len -= len;
6530 }
6531
a08d3b3b 6532 if (vcpu->mmio_cur_fragment >= vcpu->mmio_nr_fragments) {
716d51ab 6533 vcpu->mmio_needed = 0;
0912c977
PB		 6534
6535 /* FIXME: return into emulator if single-stepping. */
cef4dea0 6536 if (vcpu->mmio_is_write)
716d51ab
GN		 6537 return 1;
6538 vcpu->mmio_read_completed = 1;
6539 return complete_emulated_io(vcpu);
6540 }
87da7e66 6541
716d51ab
GN		 6542 run->exit_reason = KVM_EXIT_MMIO;
6543 run->mmio.phys_addr = frag->gpa;
6544 if (vcpu->mmio_is_write)
87da7e66
XG		 6545 memcpy(run->mmio.data, frag->data, min(8u, frag->len));
6546 run->mmio.len = min(8u, frag->len);
716d51ab
GN		 6547 run->mmio.is_write = vcpu->mmio_is_write;
6548 vcpu->arch.complete_userspace_io = complete_emulated_mmio;
6549 return 0;
5287f194
AK		 6550}
6551
716d51ab 6552
b6c7a5dc
HB		 6553int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
6554{
6555 int r;
6556 sigset_t sigsaved;
6557
e5c30142
AK		 6558 if (!tsk_used_math(current) && init_fpu(current))
6559 return -ENOMEM;
6560
ac9f6dc0
AK		 6561 if (vcpu->sigset_active)
6562 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
6563
a4535290 6564 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
b6c7a5dc 6565 kvm_vcpu_block(vcpu);
66450a21 6566 kvm_apic_accept_events(vcpu);
d7690175 6567 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
ac9f6dc0
AK		 6568 r = -EAGAIN;
6569 goto out;
b6c7a5dc
HB		 6570 }
6571
b6c7a5dc 6572 /* re-sync apic's tpr */
eea1cff9
AP		 6573 if (!irqchip_in_kernel(vcpu->kvm)) {
6574 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
6575 r = -EINVAL;
6576 goto out;
6577 }
6578 }
b6c7a5dc 6579
716d51ab
GN		 6580 if (unlikely(vcpu->arch.complete_userspace_io)) {
6581 int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io;
6582 vcpu->arch.complete_userspace_io = NULL;
6583 r = cui(vcpu);
6584 if (r <= 0)
6585 goto out;
6586 } else
6587 WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
5287f194 6588
851ba692 6589 r = __vcpu_run(vcpu);
b6c7a5dc
HB		 6590
6591out:
f1d86e46 6592 post_kvm_run_save(vcpu);
b6c7a5dc
HB		 6593 if (vcpu->sigset_active)
6594 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
6595
b6c7a5dc
HB		 6596 return r;
6597}
6598
6599int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
6600{
7ae441ea
GN		 6601 if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
6602 /*
6603 * We are here if userspace calls get_regs() in the middle of
6604 * instruction emulation. Registers state needs to be copied
4a969980 6605 * back from emulation context to vcpu. Userspace shouldn't do
7ae441ea
GN		 6606 * that usually, but some bad designed PV devices (vmware
6607 * backdoor interface) need this to work
6608 */
dd856efa 6609 emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt);
7ae441ea
GN		 6610 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
6611 }
5fdbf976
MT		 6612 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
6613 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
6614 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
6615 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
6616 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
6617 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
6618 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
6619 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
b6c7a5dc 6620#ifdef CONFIG_X86_64
5fdbf976
MT		 6621 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
6622 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
6623 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
6624 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
6625 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
6626 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
6627 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
6628 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
b6c7a5dc
HB		 6629#endif
6630
5fdbf976 6631 regs->rip = kvm_rip_read(vcpu);
91586a3b 6632 regs->rflags = kvm_get_rflags(vcpu);
b6c7a5dc 6633
b6c7a5dc
HB		 6634 return 0;
6635}
6636
6637int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
6638{
7ae441ea
GN		 6639 vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
6640 vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
6641
5fdbf976
MT		 6642 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
6643 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
6644 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
6645 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
6646 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
6647 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
6648 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
6649 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
b6c7a5dc 6650#ifdef CONFIG_X86_64
5fdbf976
MT		 6651 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
6652 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
6653 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
6654 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
6655 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
6656 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
6657 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
6658 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
b6c7a5dc
HB		 6659#endif
6660
5fdbf976 6661 kvm_rip_write(vcpu, regs->rip);
91586a3b 6662 kvm_set_rflags(vcpu, regs->rflags);
b6c7a5dc 6663
b4f14abd
JK		 6664 vcpu->arch.exception.pending = false;
6665
3842d135
AK		 6666 kvm_make_request(KVM_REQ_EVENT, vcpu);
6667
b6c7a5dc
HB		 6668 return 0;
6669}
6670
b6c7a5dc
HB		 6671void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
6672{
6673 struct kvm_segment cs;
6674
3e6e0aab 6675 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
b6c7a5dc
HB		 6676 *db = cs.db;
6677 *l = cs.l;
6678}
6679EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
6680
6681int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
6682 struct kvm_sregs *sregs)
6683{
89a27f4d 6684 struct desc_ptr dt;
b6c7a5dc 6685
3e6e0aab
GT		 6686 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
6687 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
6688 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
6689 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
6690 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
6691 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
b6c7a5dc 6692
3e6e0aab
GT		 6693 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
6694 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
b6c7a5dc
HB		 6695
6696 kvm_x86_ops->get_idt(vcpu, &dt);
89a27f4d
GN		 6697 sregs->idt.limit = dt.size;
6698 sregs->idt.base = dt.address;
b6c7a5dc 6699 kvm_x86_ops->get_gdt(vcpu, &dt);
89a27f4d
GN		 6700 sregs->gdt.limit = dt.size;
6701 sregs->gdt.base = dt.address;
b6c7a5dc 6702
4d4ec087 6703 sregs->cr0 = kvm_read_cr0(vcpu);
ad312c7c 6704 sregs->cr2 = vcpu->arch.cr2;
9f8fe504 6705 sregs->cr3 = kvm_read_cr3(vcpu);
fc78f519 6706 sregs->cr4 = kvm_read_cr4(vcpu);
2d3ad1f4 6707 sregs->cr8 = kvm_get_cr8(vcpu);
f6801dff 6708 sregs->efer = vcpu->arch.efer;
b6c7a5dc
HB		 6709 sregs->apic_base = kvm_get_apic_base(vcpu);
6710
923c61bb 6711 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
b6c7a5dc 6712
36752c9b 6713 if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
14d0bc1f
GN		 6714 set_bit(vcpu->arch.interrupt.nr,
6715 (unsigned long *)sregs->interrupt_bitmap);
16d7a191 6716
b6c7a5dc
HB		 6717 return 0;
6718}
6719
62d9f0db
MT		 6720int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
6721 struct kvm_mp_state *mp_state)
6722{
66450a21 6723 kvm_apic_accept_events(vcpu);
6aef266c
SV		 6724 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED &&
6725 vcpu->arch.pv.pv_unhalted)
6726 mp_state->mp_state = KVM_MP_STATE_RUNNABLE;
6727 else
6728 mp_state->mp_state = vcpu->arch.mp_state;
6729
62d9f0db
MT		 6730 return 0;
6731}
6732
6733int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
6734 struct kvm_mp_state *mp_state)
6735{
66450a21
JK		 6736 if (!kvm_vcpu_has_lapic(vcpu) &&
6737 mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
6738 return -EINVAL;
6739
6740 if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
6741 vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
6742 set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events);
6743 } else
6744 vcpu->arch.mp_state = mp_state->mp_state;
3842d135 6745 kvm_make_request(KVM_REQ_EVENT, vcpu);
62d9f0db
MT		 6746 return 0;
6747}
6748
7f3d35fd
KW		 6749int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
6750 int reason, bool has_error_code, u32 error_code)
b6c7a5dc 6751{
9d74191a 6752 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
8ec4722d 6753 int ret;
e01c2426 6754
8ec4722d 6755 init_emulate_ctxt(vcpu);
c697518a 6756
7f3d35fd 6757 ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
9d74191a 6758 has_error_code, error_code);
c697518a 6759
c697518a 6760 if (ret)
19d04437 6761 return EMULATE_FAIL;
37817f29 6762
9d74191a
TY		 6763 kvm_rip_write(vcpu, ctxt->eip);
6764 kvm_set_rflags(vcpu, ctxt->eflags);
3842d135 6765 kvm_make_request(KVM_REQ_EVENT, vcpu);
19d04437 6766 return EMULATE_DONE;
37817f29
IE		 6767}
6768EXPORT_SYMBOL_GPL(kvm_task_switch);
6769
b6c7a5dc
HB		 6770int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
6771 struct kvm_sregs *sregs)
6772{
58cb628d 6773 struct msr_data apic_base_msr;
b6c7a5dc 6774 int mmu_reset_needed = 0;
63f42e02 6775 int pending_vec, max_bits, idx;
89a27f4d 6776 struct desc_ptr dt;
b6c7a5dc 6777
6d1068b3
PM		 6778 if (!guest_cpuid_has_xsave(vcpu) && (sregs->cr4 & X86_CR4_OSXSAVE))
6779 return -EINVAL;
6780
89a27f4d
GN		 6781 dt.size = sregs->idt.limit;
6782 dt.address = sregs->idt.base;
b6c7a5dc 6783 kvm_x86_ops->set_idt(vcpu, &dt);
89a27f4d
GN		 6784 dt.size = sregs->gdt.limit;
6785 dt.address = sregs->gdt.base;
b6c7a5dc
HB		 6786 kvm_x86_ops->set_gdt(vcpu, &dt);
6787
ad312c7c 6788 vcpu->arch.cr2 = sregs->cr2;
9f8fe504 6789 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
dc7e795e 6790 vcpu->arch.cr3 = sregs->cr3;
aff48baa 6791 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
b6c7a5dc 6792
2d3ad1f4 6793 kvm_set_cr8(vcpu, sregs->cr8);
b6c7a5dc 6794
f6801dff 6795 mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
b6c7a5dc 6796 kvm_x86_ops->set_efer(vcpu, sregs->efer);
58cb628d
JK		 6797 apic_base_msr.data = sregs->apic_base;
6798 apic_base_msr.host_initiated = true;
6799 kvm_set_apic_base(vcpu, &apic_base_msr);
b6c7a5dc 6800
4d4ec087 6801 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
b6c7a5dc 6802 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
d7306163 6803 vcpu->arch.cr0 = sregs->cr0;
b6c7a5dc 6804
fc78f519 6805 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
b6c7a5dc 6806 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
3ea3aa8c 6807 if (sregs->cr4 & X86_CR4_OSXSAVE)
00b27a3e 6808 kvm_update_cpuid(vcpu);
63f42e02
XG		 6809
6810 idx = srcu_read_lock(&vcpu->kvm->srcu);
7c93be44 6811 if (!is_long_mode(vcpu) && is_pae(vcpu)) {
9f8fe504 6812 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
7c93be44
MT		 6813 mmu_reset_needed = 1;
6814 }
63f42e02 6815 srcu_read_unlock(&vcpu->kvm->srcu, idx);
b6c7a5dc
HB		 6816
6817 if (mmu_reset_needed)
6818 kvm_mmu_reset_context(vcpu);
6819
a50abc3b 6820 max_bits = KVM_NR_INTERRUPTS;
923c61bb
GN		 6821 pending_vec = find_first_bit(
6822 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
6823 if (pending_vec < max_bits) {
66fd3f7f 6824 kvm_queue_interrupt(vcpu, pending_vec, false);
923c61bb 6825 pr_debug("Set back pending irq %d\n", pending_vec);
b6c7a5dc
HB		 6826 }
6827
3e6e0aab
GT		 6828 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
6829 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
6830 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
6831 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
6832 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
6833 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
b6c7a5dc 6834
3e6e0aab
GT		 6835 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
6836 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
b6c7a5dc 6837
5f0269f5
ME		 6838 update_cr8_intercept(vcpu);
6839
9c3e4aab 6840 /* Older userspace won't unhalt the vcpu on reset. */
c5af89b6 6841 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
9c3e4aab 6842 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
3eeb3288 6843 !is_protmode(vcpu))
9c3e4aab
MT		 6844 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
6845
3842d135
AK		 6846 kvm_make_request(KVM_REQ_EVENT, vcpu);
6847
b6c7a5dc
HB		 6848 return 0;
6849}
6850
d0bfb940
JK		 6851int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
6852 struct kvm_guest_debug *dbg)
b6c7a5dc 6853{
355be0b9 6854 unsigned long rflags;
ae675ef0 6855 int i, r;
b6c7a5dc 6856
4f926bf2
JK		 6857 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
6858 r = -EBUSY;
6859 if (vcpu->arch.exception.pending)
2122ff5e 6860 goto out;
4f926bf2
JK		 6861 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
6862 kvm_queue_exception(vcpu, DB_VECTOR);
6863 else
6864 kvm_queue_exception(vcpu, BP_VECTOR);
6865 }
6866
91586a3b
JK		 6867 /*
6868 * Read rflags as long as potentially injected trace flags are still
6869 * filtered out.
6870 */
6871 rflags = kvm_get_rflags(vcpu);
355be0b9
JK		 6872
6873 vcpu->guest_debug = dbg->control;
6874 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
6875 vcpu->guest_debug = 0;
6876
6877 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
ae675ef0
JK		 6878 for (i = 0; i < KVM_NR_DB_REGS; ++i)
6879 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
c8639010 6880 vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7];
ae675ef0
JK		 6881 } else {
6882 for (i = 0; i < KVM_NR_DB_REGS; i++)
6883 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
ae675ef0 6884 }
c8639010 6885 kvm_update_dr7(vcpu);
ae675ef0 6886
f92653ee
JK		 6887 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6888 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
6889 get_segment_base(vcpu, VCPU_SREG_CS);
94fe45da 6890
91586a3b
JK		 6891 /*
6892 * Trigger an rflags update that will inject or remove the trace
6893 * flags.
6894 */
6895 kvm_set_rflags(vcpu, rflags);
b6c7a5dc 6896
c8639010 6897 kvm_x86_ops->update_db_bp_intercept(vcpu);
b6c7a5dc 6898
4f926bf2 6899 r = 0;
d0bfb940 6900
2122ff5e 6901out:
b6c7a5dc
HB		 6902
6903 return r;
6904}
6905
8b006791
ZX		 6906/*
6907 * Translate a guest virtual address to a guest physical address.
6908 */
6909int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
6910 struct kvm_translation *tr)
6911{
6912 unsigned long vaddr = tr->linear_address;
6913 gpa_t gpa;
f656ce01 6914 int idx;
8b006791 6915
f656ce01 6916 idx = srcu_read_lock(&vcpu->kvm->srcu);
1871c602 6917 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
f656ce01 6918 srcu_read_unlock(&vcpu->kvm->srcu, idx);
8b006791
ZX		 6919 tr->physical_address = gpa;
6920 tr->valid = gpa != UNMAPPED_GVA;
6921 tr->writeable = 1;
6922 tr->usermode = 0;
8b006791
ZX		 6923
6924 return 0;
6925}
6926
d0752060
HB		 6927int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
6928{
98918833
SY		 6929 struct i387_fxsave_struct *fxsave =
6930 &vcpu->arch.guest_fpu.state->fxsave;
d0752060 6931
d0752060
HB		 6932 memcpy(fpu->fpr, fxsave->st_space, 128);
6933 fpu->fcw = fxsave->cwd;
6934 fpu->fsw = fxsave->swd;
6935 fpu->ftwx = fxsave->twd;
6936 fpu->last_opcode = fxsave->fop;
6937 fpu->last_ip = fxsave->rip;
6938 fpu->last_dp = fxsave->rdp;
6939 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
6940
d0752060
HB		 6941 return 0;
6942}
6943
6944int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
6945{
98918833
SY		 6946 struct i387_fxsave_struct *fxsave =
6947 &vcpu->arch.guest_fpu.state->fxsave;
d0752060 6948
d0752060
HB		 6949 memcpy(fxsave->st_space, fpu->fpr, 128);
6950 fxsave->cwd = fpu->fcw;
6951 fxsave->swd = fpu->fsw;
6952 fxsave->twd = fpu->ftwx;
6953 fxsave->fop = fpu->last_opcode;
6954 fxsave->rip = fpu->last_ip;
6955 fxsave->rdp = fpu->last_dp;
6956 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
6957
d0752060
HB		 6958 return 0;
6959}
6960
10ab25cd 6961int fx_init(struct kvm_vcpu *vcpu)
d0752060 6962{
10ab25cd
JK		 6963 int err;
6964
6965 err = fpu_alloc(&vcpu->arch.guest_fpu);
6966 if (err)
6967 return err;
6968
98918833 6969 fpu_finit(&vcpu->arch.guest_fpu);
df1daba7
PB		 6970 if (cpu_has_xsaves)
6971 vcpu->arch.guest_fpu.state->xsave.xsave_hdr.xcomp_bv =
6972 host_xcr0 | XSTATE_COMPACTION_ENABLED;
d0752060 6973
2acf923e
DC		 6974 /*
6975 * Ensure guest xcr0 is valid for loading
6976 */
6977 vcpu->arch.xcr0 = XSTATE_FP;
6978
ad312c7c 6979 vcpu->arch.cr0 |= X86_CR0_ET;
10ab25cd
JK		 6980
6981 return 0;
d0752060
HB		 6982}
6983EXPORT_SYMBOL_GPL(fx_init);
6984
98918833
SY		 6985static void fx_free(struct kvm_vcpu *vcpu)
6986{
6987 fpu_free(&vcpu->arch.guest_fpu);
6988}
6989
d0752060
HB		 6990void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
6991{
2608d7a1 6992 if (vcpu->guest_fpu_loaded)
d0752060
HB		 6993 return;
6994
2acf923e
DC		 6995 /*
6996 * Restore all possible states in the guest,
6997 * and assume host would use all available bits.
6998 * Guest xcr0 would be loaded later.
6999 */
7000 kvm_put_guest_xcr0(vcpu);
d0752060 7001 vcpu->guest_fpu_loaded = 1;
b1a74bf8 7002 __kernel_fpu_begin();
98918833 7003 fpu_restore_checking(&vcpu->arch.guest_fpu);
0c04851c 7004 trace_kvm_fpu(1);
d0752060 7005}
d0752060
HB		 7006
7007void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
7008{
2acf923e
DC		 7009 kvm_put_guest_xcr0(vcpu);
7010
d0752060
HB		 7011 if (!vcpu->guest_fpu_loaded)
7012 return;
7013
7014 vcpu->guest_fpu_loaded = 0;
98918833 7015 fpu_save_init(&vcpu->arch.guest_fpu);
b1a74bf8 7016 __kernel_fpu_end();
f096ed85 7017 ++vcpu->stat.fpu_reload;
a8eeb04a 7018 kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
0c04851c 7019 trace_kvm_fpu(0);
d0752060 7020}
e9b11c17
ZX		 7021
7022void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
7023{
12f9a48f 7024 kvmclock_reset(vcpu);
7f1ea208 7025
f5f48ee1 7026 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
98918833 7027 fx_free(vcpu);
e9b11c17
ZX		 7028 kvm_x86_ops->vcpu_free(vcpu);
7029}
7030
7031struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
7032 unsigned int id)
7033{
6755bae8
ZA		 7034 if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
7035 printk_once(KERN_WARNING
7036 "kvm: SMP vm created on host with unstable TSC; "
7037 "guest TSC will not be reliable\n");
26e5215f
AK		 7038 return kvm_x86_ops->vcpu_create(kvm, id);
7039}
e9b11c17 7040
26e5215f
AK		 7041int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
7042{
7043 int r;
e9b11c17 7044
0bed3b56 7045 vcpu->arch.mtrr_state.have_fixed = 1;
9fc77441
MT		 7046 r = vcpu_load(vcpu);
7047 if (r)
7048 return r;
57f252f2 7049 kvm_vcpu_reset(vcpu);
8a3c1a33 7050 kvm_mmu_setup(vcpu);
e9b11c17 7051 vcpu_put(vcpu);
e9b11c17 7052
26e5215f 7053 return r;
e9b11c17
ZX		 7054}
7055
31928aa5 7056void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
42897d86 7057{
8fe8ab46 7058 struct msr_data msr;
332967a3 7059 struct kvm *kvm = vcpu->kvm;
42897d86 7060
31928aa5
DD		 7061 if (vcpu_load(vcpu))
7062 return;
8fe8ab46
WA		 7063 msr.data = 0x0;
7064 msr.index = MSR_IA32_TSC;
7065 msr.host_initiated = true;
7066 kvm_write_tsc(vcpu, &msr);
42897d86
MT		 7067 vcpu_put(vcpu);
7068
332967a3
AJ		 7069 schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
7070 KVMCLOCK_SYNC_PERIOD);
42897d86
MT		 7071}
7072
d40ccc62 7073void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
e9b11c17 7074{
9fc77441 7075 int r;
344d9588
GN		 7076 vcpu->arch.apf.msr_val = 0;
7077
9fc77441
MT		 7078 r = vcpu_load(vcpu);
7079 BUG_ON(r);
e9b11c17
ZX		 7080 kvm_mmu_unload(vcpu);
7081 vcpu_put(vcpu);
7082
98918833 7083 fx_free(vcpu);
e9b11c17
ZX		 7084 kvm_x86_ops->vcpu_free(vcpu);
7085}
7086
66450a21 7087void kvm_vcpu_reset(struct kvm_vcpu *vcpu)
e9b11c17 7088{
7460fb4a
AK		 7089 atomic_set(&vcpu->arch.nmi_queued, 0);
7090 vcpu->arch.nmi_pending = 0;
448fa4a9 7091 vcpu->arch.nmi_injected = false;
5f7552d4
NA		 7092 kvm_clear_interrupt_queue(vcpu);
7093 kvm_clear_exception_queue(vcpu);
448fa4a9 7094
42dbaa5a 7095 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
6f43ed01 7096 vcpu->arch.dr6 = DR6_INIT;
73aaf249 7097 kvm_update_dr6(vcpu);
42dbaa5a 7098 vcpu->arch.dr7 = DR7_FIXED_1;
c8639010 7099 kvm_update_dr7(vcpu);
42dbaa5a 7100
3842d135 7101 kvm_make_request(KVM_REQ_EVENT, vcpu);
344d9588 7102 vcpu->arch.apf.msr_val = 0;
c9aaa895 7103 vcpu->arch.st.msr_val = 0;
3842d135 7104
12f9a48f
GC		 7105 kvmclock_reset(vcpu);
7106
af585b92
GN		 7107 kvm_clear_async_pf_completion_queue(vcpu);
7108 kvm_async_pf_hash_reset(vcpu);
7109 vcpu->arch.apf.halted = false;
3842d135 7110
f5132b01
GN		 7111 kvm_pmu_reset(vcpu);
7112
66f7b72e
JS		 7113 memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
7114 vcpu->arch.regs_avail = ~0;
7115 vcpu->arch.regs_dirty = ~0;
7116
57f252f2 7117 kvm_x86_ops->vcpu_reset(vcpu);
e9b11c17
ZX		 7118}
7119
2b4a273b 7120void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)
66450a21
JK		 7121{
7122 struct kvm_segment cs;
7123
7124 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
7125 cs.selector = vector << 8;
7126 cs.base = vector << 12;
7127 kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
7128 kvm_rip_write(vcpu, 0);
e9b11c17
ZX		 7129}
7130
13a34e06 7131int kvm_arch_hardware_enable(void)
e9b11c17 7132{
ca84d1a2
ZA		 7133 struct kvm *kvm;
7134 struct kvm_vcpu *vcpu;
7135 int i;
0dd6a6ed
ZA		 7136 int ret;
7137 u64 local_tsc;
7138 u64 max_tsc = 0;
7139 bool stable, backwards_tsc = false;
18863bdd
AK		 7140
7141 kvm_shared_msr_cpu_online();
13a34e06 7142 ret = kvm_x86_ops->hardware_enable();
0dd6a6ed
ZA		 7143 if (ret != 0)
7144 return ret;
7145
7146 local_tsc = native_read_tsc();
7147 stable = !check_tsc_unstable();
7148 list_for_each_entry(kvm, &vm_list, vm_list) {
7149 kvm_for_each_vcpu(i, vcpu, kvm) {
7150 if (!stable && vcpu->cpu == smp_processor_id())
105b21bb 7151 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
0dd6a6ed
ZA		 7152 if (stable && vcpu->arch.last_host_tsc > local_tsc) {
7153 backwards_tsc = true;
7154 if (vcpu->arch.last_host_tsc > max_tsc)
7155 max_tsc = vcpu->arch.last_host_tsc;
7156 }
7157 }
7158 }
7159
7160 /*
7161 * Sometimes, even reliable TSCs go backwards. This happens on
7162 * platforms that reset TSC during suspend or hibernate actions, but
7163 * maintain synchronization. We must compensate. Fortunately, we can
7164 * detect that condition here, which happens early in CPU bringup,
7165 * before any KVM threads can be running. Unfortunately, we can't
7166 * bring the TSCs fully up to date with real time, as we aren't yet far
7167 * enough into CPU bringup that we know how much real time has actually
7168 * elapsed; our helper function, get_kernel_ns() will be using boot
7169 * variables that haven't been updated yet.
7170 *
7171 * So we simply find the maximum observed TSC above, then record the
7172 * adjustment to TSC in each VCPU. When the VCPU later gets loaded,
7173 * the adjustment will be applied. Note that we accumulate
7174 * adjustments, in case multiple suspend cycles happen before some VCPU
7175 * gets a chance to run again. In the event that no KVM threads get a
7176 * chance to run, we will miss the entire elapsed period, as we'll have
7177 * reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
7178 * loose cycle time. This isn't too big a deal, since the loss will be
7179 * uniform across all VCPUs (not to mention the scenario is extremely
7180 * unlikely). It is possible that a second hibernate recovery happens
7181 * much faster than a first, causing the observed TSC here to be
7182 * smaller; this would require additional padding adjustment, which is
7183 * why we set last_host_tsc to the local tsc observed here.
7184 *
7185 * N.B. - this code below runs only on platforms with reliable TSC,
7186 * as that is the only way backwards_tsc is set above. Also note
7187 * that this runs for ALL vcpus, which is not a bug; all VCPUs should
7188 * have the same delta_cyc adjustment applied if backwards_tsc
7189 * is detected. Note further, this adjustment is only done once,
7190 * as we reset last_host_tsc on all VCPUs to stop this from being
7191 * called multiple times (one for each physical CPU bringup).
7192 *
4a969980 7193 * Platforms with unreliable TSCs don't have to deal with this, they
0dd6a6ed
ZA		 7194 * will be compensated by the logic in vcpu_load, which sets the TSC to
7195 * catchup mode. This will catchup all VCPUs to real time, but cannot
7196 * guarantee that they stay in perfect synchronization.
7197 */
7198 if (backwards_tsc) {
7199 u64 delta_cyc = max_tsc - local_tsc;
16a96021 7200 backwards_tsc_observed = true;
0dd6a6ed
ZA		 7201 list_for_each_entry(kvm, &vm_list, vm_list) {
7202 kvm_for_each_vcpu(i, vcpu, kvm) {
7203 vcpu->arch.tsc_offset_adjustment += delta_cyc;
7204 vcpu->arch.last_host_tsc = local_tsc;
105b21bb 7205 kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
0dd6a6ed
ZA		 7206 }
7207
7208 /*
7209 * We have to disable TSC offset matching.. if you were
7210 * booting a VM while issuing an S4 host suspend....
7211 * you may have some problem. Solving this issue is
7212 * left as an exercise to the reader.
7213 */
7214 kvm->arch.last_tsc_nsec = 0;
7215 kvm->arch.last_tsc_write = 0;
7216 }
7217
7218 }
7219 return 0;
e9b11c17
ZX		 7220}
7221
13a34e06 7222void kvm_arch_hardware_disable(void)
e9b11c17 7223{
13a34e06
RK		 7224 kvm_x86_ops->hardware_disable();
7225 drop_user_return_notifiers();
e9b11c17
ZX		 7226}
7227
7228int kvm_arch_hardware_setup(void)
7229{
7230 return kvm_x86_ops->hardware_setup();
7231}
7232
7233void kvm_arch_hardware_unsetup(void)
7234{
7235 kvm_x86_ops->hardware_unsetup();
7236}
7237
7238void kvm_arch_check_processor_compat(void *rtn)
7239{
7240 kvm_x86_ops->check_processor_compatibility(rtn);
7241}
7242
3e515705
AK		 7243bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
7244{
7245 return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
7246}
7247
54e9818f
GN		 7248struct static_key kvm_no_apic_vcpu __read_mostly;
7249
e9b11c17
ZX		 7250int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
7251{
7252 struct page *page;
7253 struct kvm *kvm;
7254 int r;
7255
7256 BUG_ON(vcpu->kvm == NULL);
7257 kvm = vcpu->kvm;
7258
6aef266c 7259 vcpu->arch.pv.pv_unhalted = false;
9aabc88f 7260 vcpu->arch.emulate_ctxt.ops = &emulate_ops;
c5af89b6 7261 if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
a4535290 7262 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
e9b11c17 7263 else
a4535290 7264 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
e9b11c17
ZX		 7265
7266 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
7267 if (!page) {
7268 r = -ENOMEM;
7269 goto fail;
7270 }
ad312c7c 7271 vcpu->arch.pio_data = page_address(page);
e9b11c17 7272
cc578287 7273 kvm_set_tsc_khz(vcpu, max_tsc_khz);
c285545f 7274
e9b11c17
ZX		 7275 r = kvm_mmu_create(vcpu);
7276 if (r < 0)
7277 goto fail_free_pio_data;
7278
7279 if (irqchip_in_kernel(kvm)) {
7280 r = kvm_create_lapic(vcpu);
7281 if (r < 0)
7282 goto fail_mmu_destroy;
54e9818f
GN		 7283 } else
7284 static_key_slow_inc(&kvm_no_apic_vcpu);
e9b11c17 7285
890ca9ae
HY		 7286 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
7287 GFP_KERNEL);
7288 if (!vcpu->arch.mce_banks) {
7289 r = -ENOMEM;
443c39bc 7290 goto fail_free_lapic;
890ca9ae
HY		 7291 }
7292 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
7293
f1797359
WY		 7294 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) {
7295 r = -ENOMEM;
f5f48ee1 7296 goto fail_free_mce_banks;
f1797359 7297 }
f5f48ee1 7298
66f7b72e
JS		 7299 r = fx_init(vcpu);
7300 if (r)
7301 goto fail_free_wbinvd_dirty_mask;
7302
ba904635 7303 vcpu->arch.ia32_tsc_adjust_msr = 0x0;
0b79459b 7304 vcpu->arch.pv_time_enabled = false;
d7876f1b
PB		 7305
7306 vcpu->arch.guest_supported_xcr0 = 0;
4344ee98 7307 vcpu->arch.guest_xstate_size = XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET;
d7876f1b 7308
af585b92 7309 kvm_async_pf_hash_reset(vcpu);
f5132b01 7310 kvm_pmu_init(vcpu);
af585b92 7311
e9b11c17 7312 return 0;
66f7b72e
JS		 7313fail_free_wbinvd_dirty_mask:
7314 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
f5f48ee1
SY		 7315fail_free_mce_banks:
7316 kfree(vcpu->arch.mce_banks);
443c39bc
WY		 7317fail_free_lapic:
7318 kvm_free_lapic(vcpu);
e9b11c17
ZX		 7319fail_mmu_destroy:
7320 kvm_mmu_destroy(vcpu);
7321fail_free_pio_data:
ad312c7c 7322 free_page((unsigned long)vcpu->arch.pio_data);
e9b11c17
ZX		 7323fail:
7324 return r;
7325}
7326
7327void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
7328{
f656ce01
MT		 7329 int idx;
7330
f5132b01 7331 kvm_pmu_destroy(vcpu);
36cb93fd 7332 kfree(vcpu->arch.mce_banks);
e9b11c17 7333 kvm_free_lapic(vcpu);
f656ce01 7334 idx = srcu_read_lock(&vcpu->kvm->srcu);
e9b11c17 7335 kvm_mmu_destroy(vcpu);
f656ce01 7336 srcu_read_unlock(&vcpu->kvm->srcu, idx);
ad312c7c 7337 free_page((unsigned long)vcpu->arch.pio_data);
54e9818f
GN		 7338 if (!irqchip_in_kernel(vcpu->kvm))
7339 static_key_slow_dec(&kvm_no_apic_vcpu);
e9b11c17 7340}
d19a9cd2 7341
e790d9ef
RK		 7342void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu)
7343{
ae97a3b8 7344 kvm_x86_ops->sched_in(vcpu, cpu);
e790d9ef
RK		 7345}
7346
e08b9637 7347int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
d19a9cd2 7348{
e08b9637
CO		 7349 if (type)
7350 return -EINVAL;
7351
6ef768fa 7352 INIT_HLIST_HEAD(&kvm->arch.mask_notifier_list);
f05e70ac 7353 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
365c8868 7354 INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
4d5c5d0f 7355 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
e0f0bbc5 7356 atomic_set(&kvm->arch.noncoherent_dma_count, 0);
d19a9cd2 7357
5550af4d
SY		 7358 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
7359 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
7a84428a
AW		 7360 /* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
7361 set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
7362 &kvm->arch.irq_sources_bitmap);
5550af4d 7363
038f8c11 7364 raw_spin_lock_init(&kvm->arch.tsc_write_lock);
1e08ec4a 7365 mutex_init(&kvm->arch.apic_map_lock);
d828199e
MT		 7366 spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock);
7367
7368 pvclock_update_vm_gtod_copy(kvm);
53f658b3 7369
7e44e449 7370 INIT_DELAYED_WORK(&kvm->arch.kvmclock_update_work, kvmclock_update_fn);
332967a3 7371 INIT_DELAYED_WORK(&kvm->arch.kvmclock_sync_work, kvmclock_sync_fn);
7e44e449 7372
d89f5eff 7373 return 0;
d19a9cd2
ZX		 7374}
7375
7376static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
7377{
9fc77441
MT		 7378 int r;
7379 r = vcpu_load(vcpu);
7380 BUG_ON(r);
d19a9cd2
ZX		 7381 kvm_mmu_unload(vcpu);
7382 vcpu_put(vcpu);
7383}
7384
7385static void kvm_free_vcpus(struct kvm *kvm)
7386{
7387 unsigned int i;
988a2cae 7388 struct kvm_vcpu *vcpu;
d19a9cd2
ZX		 7389
7390 /*
7391 * Unpin any mmu pages first.
7392 */
af585b92
GN		 7393 kvm_for_each_vcpu(i, vcpu, kvm) {
7394 kvm_clear_async_pf_completion_queue(vcpu);
988a2cae 7395 kvm_unload_vcpu_mmu(vcpu);
af585b92 7396 }
988a2cae
GN		 7397 kvm_for_each_vcpu(i, vcpu, kvm)
7398 kvm_arch_vcpu_free(vcpu);
7399
7400 mutex_lock(&kvm->lock);
7401 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
7402 kvm->vcpus[i] = NULL;
d19a9cd2 7403
988a2cae
GN		 7404 atomic_set(&kvm->online_vcpus, 0);
7405 mutex_unlock(&kvm->lock);
d19a9cd2
ZX		 7406}
7407
ad8ba2cd
SY		 7408void kvm_arch_sync_events(struct kvm *kvm)
7409{
332967a3 7410 cancel_delayed_work_sync(&kvm->arch.kvmclock_sync_work);
7e44e449 7411 cancel_delayed_work_sync(&kvm->arch.kvmclock_update_work);
ba4cef31 7412 kvm_free_all_assigned_devices(kvm);
aea924f6 7413 kvm_free_pit(kvm);
ad8ba2cd
SY		 7414}
7415
d19a9cd2
ZX		 7416void kvm_arch_destroy_vm(struct kvm *kvm)
7417{
27469d29
AH		 7418 if (current->mm == kvm->mm) {
7419 /*
7420 * Free memory regions allocated on behalf of userspace,
7421 * unless the the memory map has changed due to process exit
7422 * or fd copying.
7423 */
7424 struct kvm_userspace_memory_region mem;
7425 memset(&mem, 0, sizeof(mem));
7426 mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
7427 kvm_set_memory_region(kvm, &mem);
7428
7429 mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
7430 kvm_set_memory_region(kvm, &mem);
7431
7432 mem.slot = TSS_PRIVATE_MEMSLOT;
7433 kvm_set_memory_region(kvm, &mem);
7434 }
6eb55818 7435 kvm_iommu_unmap_guest(kvm);
d7deeeb0
ZX		 7436 kfree(kvm->arch.vpic);
7437 kfree(kvm->arch.vioapic);
d19a9cd2 7438 kvm_free_vcpus(kvm);
1e08ec4a 7439 kfree(rcu_dereference_check(kvm->arch.apic_map, 1));
d19a9cd2 7440}
0de10343 7441
5587027c 7442void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
db3fe4eb
TY		 7443 struct kvm_memory_slot *dont)
7444{
7445 int i;
7446
d89cc617
TY		 7447 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
7448 if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) {
548ef284 7449 kvfree(free->arch.rmap[i]);
d89cc617 7450 free->arch.rmap[i] = NULL;
77d11309 7451 }
d89cc617
TY		 7452 if (i == 0)
7453 continue;
7454
7455 if (!dont || free->arch.lpage_info[i - 1] !=
7456 dont->arch.lpage_info[i - 1]) {
548ef284 7457 kvfree(free->arch.lpage_info[i - 1]);
d89cc617 7458 free->arch.lpage_info[i - 1] = NULL;
db3fe4eb
TY		 7459 }
7460 }
7461}
7462
5587027c
AK		 7463int kvm_arch_create_memslot(struct kvm *kvm, struct kvm_memory_slot *slot,
7464 unsigned long npages)
db3fe4eb
TY		 7465{
7466 int i;
7467
d89cc617 7468 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
db3fe4eb
TY		 7469 unsigned long ugfn;
7470 int lpages;
d89cc617 7471 int level = i + 1;
db3fe4eb
TY		 7472
7473 lpages = gfn_to_index(slot->base_gfn + npages - 1,
7474 slot->base_gfn, level) + 1;
7475
d89cc617
TY		 7476 slot->arch.rmap[i] =
7477 kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap[i]));
7478 if (!slot->arch.rmap[i])
77d11309 7479 goto out_free;
d89cc617
TY		 7480 if (i == 0)
7481 continue;
77d11309 7482
d89cc617
TY		 7483 slot->arch.lpage_info[i - 1] = kvm_kvzalloc(lpages *
7484 sizeof(*slot->arch.lpage_info[i - 1]));
7485 if (!slot->arch.lpage_info[i - 1])
db3fe4eb
TY		 7486 goto out_free;
7487
7488 if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
d89cc617 7489 slot->arch.lpage_info[i - 1][0].write_count = 1;
db3fe4eb 7490 if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
d89cc617 7491 slot->arch.lpage_info[i - 1][lpages - 1].write_count = 1;
db3fe4eb
TY		 7492 ugfn = slot->userspace_addr >> PAGE_SHIFT;
7493 /*
7494 * If the gfn and userspace address are not aligned wrt each
7495 * other, or if explicitly asked to, disable large page
7496 * support for this slot
7497 */
7498 if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
7499 !kvm_largepages_enabled()) {
7500 unsigned long j;
7501
7502 for (j = 0; j < lpages; ++j)
d89cc617 7503 slot->arch.lpage_info[i - 1][j].write_count = 1;
db3fe4eb
TY		 7504 }
7505 }
7506
7507 return 0;
7508
7509out_free:
d89cc617 7510 for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
548ef284 7511 kvfree(slot->arch.rmap[i]);
d89cc617
TY		 7512 slot->arch.rmap[i] = NULL;
7513 if (i == 0)
7514 continue;
7515
548ef284 7516 kvfree(slot->arch.lpage_info[i - 1]);
d89cc617 7517 slot->arch.lpage_info[i - 1] = NULL;
db3fe4eb
TY		 7518 }
7519 return -ENOMEM;
7520}
7521
e59dbe09
TY		 7522void kvm_arch_memslots_updated(struct kvm *kvm)
7523{
e6dff7d1
TY		 7524 /*
7525 * memslots->generation has been incremented.
7526 * mmio generation may have reached its maximum value.
7527 */
7528 kvm_mmu_invalidate_mmio_sptes(kvm);
e59dbe09
TY		 7529}
7530
f7784b8e
MT		 7531int kvm_arch_prepare_memory_region(struct kvm *kvm,
7532 struct kvm_memory_slot *memslot,
f7784b8e 7533 struct kvm_userspace_memory_region *mem,
7b6195a9 7534 enum kvm_mr_change change)
0de10343 7535{
7a905b14
TY		 7536 /*
7537 * Only private memory slots need to be mapped here since
7538 * KVM_SET_MEMORY_REGION ioctl is no longer supported.
0de10343 7539 */
7b6195a9 7540 if ((memslot->id >= KVM_USER_MEM_SLOTS) && (change == KVM_MR_CREATE)) {
7a905b14 7541 unsigned long userspace_addr;
604b38ac 7542
7a905b14
TY		 7543 /*
7544 * MAP_SHARED to prevent internal slot pages from being moved
7545 * by fork()/COW.
7546 */
7b6195a9 7547 userspace_addr = vm_mmap(NULL, 0, memslot->npages * PAGE_SIZE,
7a905b14
TY		 7548 PROT_READ | PROT_WRITE,
7549 MAP_SHARED | MAP_ANONYMOUS, 0);
0de10343 7550
7a905b14
TY		 7551 if (IS_ERR((void *)userspace_addr))
7552 return PTR_ERR((void *)userspace_addr);
604b38ac 7553
7a905b14 7554 memslot->userspace_addr = userspace_addr;
0de10343
ZX		 7555 }
7556
f7784b8e
MT		 7557 return 0;
7558}
7559
88178fd4
KH		 7560static void kvm_mmu_slot_apply_flags(struct kvm *kvm,
7561 struct kvm_memory_slot *new)
7562{
7563 /* Still write protect RO slot */
7564 if (new->flags & KVM_MEM_READONLY) {
7565 kvm_mmu_slot_remove_write_access(kvm, new);
7566 return;
7567 }
7568
7569 /*
7570 * Call kvm_x86_ops dirty logging hooks when they are valid.
7571 *
7572 * kvm_x86_ops->slot_disable_log_dirty is called when:
7573 *
7574 * - KVM_MR_CREATE with dirty logging is disabled
7575 * - KVM_MR_FLAGS_ONLY with dirty logging is disabled in new flag
7576 *
7577 * The reason is, in case of PML, we need to set D-bit for any slots
7578 * with dirty logging disabled in order to eliminate unnecessary GPA
7579 * logging in PML buffer (and potential PML buffer full VMEXT). This
7580 * guarantees leaving PML enabled during guest's lifetime won't have
7581 * any additonal overhead from PML when guest is running with dirty
7582 * logging disabled for memory slots.
7583 *
7584 * kvm_x86_ops->slot_enable_log_dirty is called when switching new slot
7585 * to dirty logging mode.
7586 *
7587 * If kvm_x86_ops dirty logging hooks are invalid, use write protect.
7588 *
7589 * In case of write protect:
7590 *
7591 * Write protect all pages for dirty logging.
7592 *
7593 * All the sptes including the large sptes which point to this
7594 * slot are set to readonly. We can not create any new large
7595 * spte on this slot until the end of the logging.
7596 *
7597 * See the comments in fast_page_fault().
7598 */
7599 if (new->flags & KVM_MEM_LOG_DIRTY_PAGES) {
7600 if (kvm_x86_ops->slot_enable_log_dirty)
7601 kvm_x86_ops->slot_enable_log_dirty(kvm, new);
7602 else
7603 kvm_mmu_slot_remove_write_access(kvm, new);
7604 } else {
7605 if (kvm_x86_ops->slot_disable_log_dirty)
7606 kvm_x86_ops->slot_disable_log_dirty(kvm, new);
7607 }
7608}
7609
f7784b8e
MT		 7610void kvm_arch_commit_memory_region(struct kvm *kvm,
7611 struct kvm_userspace_memory_region *mem,
8482644a
TY		 7612 const struct kvm_memory_slot *old,
7613 enum kvm_mr_change change)
f7784b8e 7614{
1c91cad4 7615 struct kvm_memory_slot *new;
8482644a 7616 int nr_mmu_pages = 0;
f7784b8e 7617
8482644a 7618 if ((mem->slot >= KVM_USER_MEM_SLOTS) && (change == KVM_MR_DELETE)) {
f7784b8e
MT		 7619 int ret;
7620
8482644a
TY		 7621 ret = vm_munmap(old->userspace_addr,
7622 old->npages * PAGE_SIZE);
f7784b8e
MT		 7623 if (ret < 0)
7624 printk(KERN_WARNING
7625 "kvm_vm_ioctl_set_memory_region: "
7626 "failed to munmap memory\n");
7627 }
7628
48c0e4e9
XG		 7629 if (!kvm->arch.n_requested_mmu_pages)
7630 nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
7631
48c0e4e9 7632 if (nr_mmu_pages)
0de10343 7633 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
1c91cad4
KH		 7634
7635 /* It's OK to get 'new' slot here as it has already been installed */
7636 new = id_to_memslot(kvm->memslots, mem->slot);
7637
c972f3b1 7638 /*
88178fd4 7639 * Set up write protection and/or dirty logging for the new slot.
c126d94f 7640 *
88178fd4
KH		 7641 * For KVM_MR_DELETE and KVM_MR_MOVE, the shadow pages of old slot have
7642 * been zapped so no dirty logging staff is needed for old slot. For
7643 * KVM_MR_FLAGS_ONLY, the old slot is essentially the same one as the
7644 * new and it's also covered when dealing with the new slot.
c972f3b1 7645 */
88178fd4
KH		 7646 if (change != KVM_MR_DELETE)
7647 kvm_mmu_slot_apply_flags(kvm, new);
0de10343 7648}
1d737c8a 7649
2df72e9b 7650void kvm_arch_flush_shadow_all(struct kvm *kvm)
34d4cb8f 7651{
6ca18b69 7652 kvm_mmu_invalidate_zap_all_pages(kvm);
34d4cb8f
MT		 7653}
7654
2df72e9b
MT		 7655void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
7656 struct kvm_memory_slot *slot)
7657{
6ca18b69 7658 kvm_mmu_invalidate_zap_all_pages(kvm);
2df72e9b
MT		 7659}
7660
1d737c8a
ZX		 7661int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
7662{
b6b8a145
JK		 7663 if (is_guest_mode(vcpu) && kvm_x86_ops->check_nested_events)
7664 kvm_x86_ops->check_nested_events(vcpu, false);
7665
af585b92
GN		 7666 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
7667 !vcpu->arch.apf.halted)
7668 || !list_empty_careful(&vcpu->async_pf.done)
66450a21 7669 || kvm_apic_has_events(vcpu)
6aef266c 7670 || vcpu->arch.pv.pv_unhalted
7460fb4a 7671 || atomic_read(&vcpu->arch.nmi_queued) ||
a1b37100
GN		 7672 (kvm_arch_interrupt_allowed(vcpu) &&
7673 kvm_cpu_has_interrupt(vcpu));
1d737c8a 7674}
5736199a 7675
b6d33834 7676int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
5736199a 7677{
b6d33834 7678 return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
5736199a 7679}
78646121
GN		 7680
7681int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
7682{
7683 return kvm_x86_ops->interrupt_allowed(vcpu);
7684}
229456fc 7685
82b32774 7686unsigned long kvm_get_linear_rip(struct kvm_vcpu *vcpu)
f92653ee 7687{
82b32774
NA		 7688 if (is_64_bit_mode(vcpu))
7689 return kvm_rip_read(vcpu);
7690 return (u32)(get_segment_base(vcpu, VCPU_SREG_CS) +
7691 kvm_rip_read(vcpu));
7692}
7693EXPORT_SYMBOL_GPL(kvm_get_linear_rip);
f92653ee 7694
82b32774
NA		 7695bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
7696{
7697 return kvm_get_linear_rip(vcpu) == linear_rip;
f92653ee
JK		 7698}
7699EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
7700
94fe45da
JK		 7701unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
7702{
7703 unsigned long rflags;
7704
7705 rflags = kvm_x86_ops->get_rflags(vcpu);
7706 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
c310bac5 7707 rflags &= ~X86_EFLAGS_TF;
94fe45da
JK		 7708 return rflags;
7709}
7710EXPORT_SYMBOL_GPL(kvm_get_rflags);
7711
6addfc42 7712static void __kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
94fe45da
JK		 7713{
7714 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
f92653ee 7715 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
c310bac5 7716 rflags |= X86_EFLAGS_TF;
94fe45da 7717 kvm_x86_ops->set_rflags(vcpu, rflags);
6addfc42
PB		 7718}
7719
7720void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
7721{
7722 __kvm_set_rflags(vcpu, rflags);
3842d135 7723 kvm_make_request(KVM_REQ_EVENT, vcpu);
94fe45da
JK		 7724}
7725EXPORT_SYMBOL_GPL(kvm_set_rflags);
7726
56028d08
GN		 7727void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
7728{
7729 int r;
7730
fb67e14f 7731 if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
f2e10669 7732 work->wakeup_all)
56028d08
GN		 7733 return;
7734
7735 r = kvm_mmu_reload(vcpu);
7736 if (unlikely(r))
7737 return;
7738
fb67e14f
XG		 7739 if (!vcpu->arch.mmu.direct_map &&
7740 work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
7741 return;
7742
56028d08
GN		 7743 vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
7744}
7745
af585b92
GN		 7746static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
7747{
7748 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
7749}
7750
7751static inline u32 kvm_async_pf_next_probe(u32 key)
7752{
7753 return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
7754}
7755
7756static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
7757{
7758 u32 key = kvm_async_pf_hash_fn(gfn);
7759
7760 while (vcpu->arch.apf.gfns[key] != ~0)
7761 key = kvm_async_pf_next_probe(key);
7762
7763 vcpu->arch.apf.gfns[key] = gfn;
7764}
7765
7766static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
7767{
7768 int i;
7769 u32 key = kvm_async_pf_hash_fn(gfn);
7770
7771 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
c7d28c24
XG		 7772 (vcpu->arch.apf.gfns[key] != gfn &&
7773 vcpu->arch.apf.gfns[key] != ~0); i++)
af585b92
GN		 7774 key = kvm_async_pf_next_probe(key);
7775
7776 return key;
7777}
7778
7779bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
7780{
7781 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
7782}
7783
7784static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
7785{
7786 u32 i, j, k;
7787
7788 i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
7789 while (true) {
7790 vcpu->arch.apf.gfns[i] = ~0;
7791 do {
7792 j = kvm_async_pf_next_probe(j);
7793 if (vcpu->arch.apf.gfns[j] == ~0)
7794 return;
7795 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
7796 /*
7797 * k lies cyclically in ]i,j]
7798 * | i.k.j |
7799 * |....j i.k.| or |.k..j i...|
7800 */
7801 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
7802 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
7803 i = j;
7804 }
7805}
7806
7c90705b
GN		 7807static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
7808{
7809
7810 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
7811 sizeof(val));
7812}
7813
af585b92
GN		 7814void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
7815 struct kvm_async_pf *work)
7816{
6389ee94
AK		 7817 struct x86_exception fault;
7818
7c90705b 7819 trace_kvm_async_pf_not_present(work->arch.token, work->gva);
af585b92 7820 kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
7c90705b
GN		 7821
7822 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
fc5f06fa
GN		 7823 (vcpu->arch.apf.send_user_only &&
7824 kvm_x86_ops->get_cpl(vcpu) == 0))
7c90705b
GN		 7825 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
7826 else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
6389ee94
AK		 7827 fault.vector = PF_VECTOR;
7828 fault.error_code_valid = true;
7829 fault.error_code = 0;
7830 fault.nested_page_fault = false;
7831 fault.address = work->arch.token;
7832 kvm_inject_page_fault(vcpu, &fault);
7c90705b 7833 }
af585b92
GN		 7834}
7835
7836void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
7837 struct kvm_async_pf *work)
7838{
6389ee94
AK		 7839 struct x86_exception fault;
7840
7c90705b 7841 trace_kvm_async_pf_ready(work->arch.token, work->gva);
f2e10669 7842 if (work->wakeup_all)
7c90705b
GN		 7843 work->arch.token = ~0; /* broadcast wakeup */
7844 else
7845 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
7846
7847 if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
7848 !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
6389ee94
AK		 7849 fault.vector = PF_VECTOR;
7850 fault.error_code_valid = true;
7851 fault.error_code = 0;
7852 fault.nested_page_fault = false;
7853 fault.address = work->arch.token;
7854 kvm_inject_page_fault(vcpu, &fault);
7c90705b 7855 }
e6d53e3b 7856 vcpu->arch.apf.halted = false;
a4fa1635 7857 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
7c90705b
GN		 7858}
7859
7860bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
7861{
7862 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
7863 return true;
7864 else
7865 return !kvm_event_needs_reinjection(vcpu) &&
7866 kvm_x86_ops->interrupt_allowed(vcpu);
af585b92
GN		 7867}
7868
e0f0bbc5
AW		 7869void kvm_arch_register_noncoherent_dma(struct kvm *kvm)
7870{
7871 atomic_inc(&kvm->arch.noncoherent_dma_count);
7872}
7873EXPORT_SYMBOL_GPL(kvm_arch_register_noncoherent_dma);
7874
7875void kvm_arch_unregister_noncoherent_dma(struct kvm *kvm)
7876{
7877 atomic_dec(&kvm->arch.noncoherent_dma_count);
7878}
7879EXPORT_SYMBOL_GPL(kvm_arch_unregister_noncoherent_dma);
7880
7881bool kvm_arch_has_noncoherent_dma(struct kvm *kvm)
7882{
7883 return atomic_read(&kvm->arch.noncoherent_dma_count);
7884}
7885EXPORT_SYMBOL_GPL(kvm_arch_has_noncoherent_dma);
7886
229456fc
MT		 7887EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
7888EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
7889EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
7890EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
7891EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
0ac406de 7892EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
d8cabddf 7893EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
17897f36 7894EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
236649de 7895EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
ec1ff790 7896EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
532a46b9 7897EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
2e554e8d 7898EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
489223ed 7899EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
7b46268d 7900EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_ple_window);
843e4330 7901EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_pml_full);
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