arch/x86/kvm/x86.c

   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.
   7  * Copyright (C) 2008 Qumranet, Inc.
   8  * Copyright IBM Corporation, 2008
   9  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  10  *
  11  * Authors:
  12  *   Avi Kivity   <avi@qumranet.com>
  13  *   Yaniv Kamay  <yaniv@qumranet.com>
  14  *   Amit Shah    <amit.shah@qumranet.com>
  15  *   Ben-Ami Yassour <benami@il.ibm.com>
  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
  22 #include <linux/kvm_host.h>
  23 #include "irq.h"
  24 #include "mmu.h"
  25 #include "i8254.h"
  26 #include "tss.h"
  27 #include "kvm_cache_regs.h"
  28 #include "x86.h"
  29
  30 #include <linux/clocksource.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/kvm.h>
  33 #include <linux/fs.h>
  34 #include <linux/vmalloc.h>
  35 #include <linux/module.h>
  36 #include <linux/mman.h>
  37 #include <linux/highmem.h>
  38 #include <linux/iommu.h>
  39 #include <linux/intel-iommu.h>
  40 #include <linux/cpufreq.h>
  41 #include <linux/user-return-notifier.h>
  42 #include <linux/srcu.h>
  43 #include <linux/slab.h>
  44 #include <linux/perf_event.h>
  45 #include <linux/uaccess.h>
  46 #include <linux/hash.h>
  47 #include <trace/events/kvm.h>
  48
  49 #define CREATE_TRACE_POINTS
  50 #include "trace.h"
  51
  52 #include <asm/debugreg.h>
  53 #include <asm/msr.h>
  54 #include <asm/desc.h>
  55 #include <asm/mtrr.h>
  56 #include <asm/mce.h>
  57 #include <asm/i387.h>
  58 #include <asm/xcr.h>
  59 #include <asm/pvclock.h>
  60 #include <asm/div64.h>
  61
  62 #define MAX_IO_MSRS 256
  63 #define CR0_RESERVED_BITS                                               \
  64         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
  65                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
  66                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
  67 #define CR4_RESERVED_BITS                                               \
  68         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
  69                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
  70                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
  71                           | X86_CR4_OSXSAVE \
  72                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
  73
  74 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
  75
  76 #define KVM_MAX_MCE_BANKS 32
  77 #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
  78
  79 /* EFER defaults:
  80  * - enable syscall per default because its emulated by KVM
  81  * - enable LME and LMA per default on 64 bit KVM
  82  */
  83 #ifdef CONFIG_X86_64
  84 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
  85 #else
  86 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
  87 #endif
  88
  89 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
  90 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
  91
  92 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
  93 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
  94                                     struct kvm_cpuid_entry2 __user *entries);
  95
  96 struct kvm_x86_ops *kvm_x86_ops;
  97 EXPORT_SYMBOL_GPL(kvm_x86_ops);
  98
  99 int ignore_msrs = 0;
 100 module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR);
 101
 102 #define KVM_NR_SHARED_MSRS 16
 103
 104 struct kvm_shared_msrs_global {
 105         int nr;
 106         u32 msrs[KVM_NR_SHARED_MSRS];
 107 };
 108
 109 struct kvm_shared_msrs {
 110         struct user_return_notifier urn;
 111         bool registered;
 112         struct kvm_shared_msr_values {
 113                 u64 host;
 114                 u64 curr;
 115         } values[KVM_NR_SHARED_MSRS];
 116 };
 117
 118 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
 119 static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
 120
 121 struct kvm_stats_debugfs_item debugfs_entries[] = {
 122         { "pf_fixed", VCPU_STAT(pf_fixed) },
 123         { "pf_guest", VCPU_STAT(pf_guest) },
 124         { "tlb_flush", VCPU_STAT(tlb_flush) },
 125         { "invlpg", VCPU_STAT(invlpg) },
 126         { "exits", VCPU_STAT(exits) },
 127         { "io_exits", VCPU_STAT(io_exits) },
 128         { "mmio_exits", VCPU_STAT(mmio_exits) },
 129         { "signal_exits", VCPU_STAT(signal_exits) },
 130         { "irq_window", VCPU_STAT(irq_window_exits) },
 131         { "nmi_window", VCPU_STAT(nmi_window_exits) },
 132         { "halt_exits", VCPU_STAT(halt_exits) },
 133         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
 134         { "hypercalls", VCPU_STAT(hypercalls) },
 135         { "request_irq", VCPU_STAT(request_irq_exits) },
 136         { "irq_exits", VCPU_STAT(irq_exits) },
 137         { "host_state_reload", VCPU_STAT(host_state_reload) },
 138         { "efer_reload", VCPU_STAT(efer_reload) },
 139         { "fpu_reload", VCPU_STAT(fpu_reload) },
 140         { "insn_emulation", VCPU_STAT(insn_emulation) },
 141         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
 142         { "irq_injections", VCPU_STAT(irq_injections) },
 143         { "nmi_injections", VCPU_STAT(nmi_injections) },
 144         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
 145         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
 146         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
 147         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
 148         { "mmu_flooded", VM_STAT(mmu_flooded) },
 149         { "mmu_recycled", VM_STAT(mmu_recycled) },
 150         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
 151         { "mmu_unsync", VM_STAT(mmu_unsync) },
 152         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
 153         { "largepages", VM_STAT(lpages) },
 154         { NULL }
 155 };
 156
 157 u64 __read_mostly host_xcr0;
 158
 159 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
 160 {
 161         int i;
 162         for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
 163                 vcpu->arch.apf.gfns[i] = ~0;
 164 }
 165
 166 static void kvm_on_user_return(struct user_return_notifier *urn)
 167 {
 168         unsigned slot;
 169         struct kvm_shared_msrs *locals
 170                 = container_of(urn, struct kvm_shared_msrs, urn);
 171         struct kvm_shared_msr_values *values;
 172
 173         for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
 174                 values = &locals->values[slot];
 175                 if (values->host != values->curr) {
 176                         wrmsrl(shared_msrs_global.msrs[slot], values->host);
 177                         values->curr = values->host;
 178                 }
 179         }
 180         locals->registered = false;
 181         user_return_notifier_unregister(urn);
 182 }
 183
 184 static void shared_msr_update(unsigned slot, u32 msr)
 185 {
 186         struct kvm_shared_msrs *smsr;
 187         u64 value;
 188
 189         smsr = &__get_cpu_var(shared_msrs);
 190         /* only read, and nobody should modify it at this time,
 191          * so don't need lock */
 192         if (slot >= shared_msrs_global.nr) {
 193                 printk(KERN_ERR "kvm: invalid MSR slot!");
 194                 return;
 195         }
 196         rdmsrl_safe(msr, &value);
 197         smsr->values[slot].host = value;
 198         smsr->values[slot].curr = value;
 199 }
 200
 201 void kvm_define_shared_msr(unsigned slot, u32 msr)
 202 {
 203         if (slot >= shared_msrs_global.nr)
 204                 shared_msrs_global.nr = slot + 1;
 205         shared_msrs_global.msrs[slot] = msr;
 206         /* we need ensured the shared_msr_global have been updated */
 207         smp_wmb();
 208 }
 209 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
 210
 211 static void kvm_shared_msr_cpu_online(void)
 212 {
 213         unsigned i;
 214
 215         for (i = 0; i < shared_msrs_global.nr; ++i)
 216                 shared_msr_update(i, shared_msrs_global.msrs[i]);
 217 }
 218
 219 void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
 220 {
 221         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 222
 223         if (((value ^ smsr->values[slot].curr) & mask) == 0)
 224                 return;
 225         smsr->values[slot].curr = value;
 226         wrmsrl(shared_msrs_global.msrs[slot], value);
 227         if (!smsr->registered) {
 228                 smsr->urn.on_user_return = kvm_on_user_return;
 229                 user_return_notifier_register(&smsr->urn);
 230                 smsr->registered = true;
 231         }
 232 }
 233 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
 234
 235 static void drop_user_return_notifiers(void *ignore)
 236 {
 237         struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
 238
 239         if (smsr->registered)
 240                 kvm_on_user_return(&smsr->urn);
 241 }
 242
 243 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
 244 {
 245         if (irqchip_in_kernel(vcpu->kvm))
 246                 return vcpu->arch.apic_base;
 247         else
 248                 return vcpu->arch.apic_base;
 249 }
 250 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
 251
 252 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
 253 {
 254         /* TODO: reserve bits check */
 255         if (irqchip_in_kernel(vcpu->kvm))
 256                 kvm_lapic_set_base(vcpu, data);
 257         else
 258                 vcpu->arch.apic_base = data;
 259 }
 260 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
 261
 262 #define EXCPT_BENIGN            0
 263 #define EXCPT_CONTRIBUTORY      1
 264 #define EXCPT_PF                2
 265
 266 static int exception_class(int vector)
 267 {
 268         switch (vector) {
 269         case PF_VECTOR:
 270                 return EXCPT_PF;
 271         case DE_VECTOR:
 272         case TS_VECTOR:
 273         case NP_VECTOR:
 274         case SS_VECTOR:
 275         case GP_VECTOR:
 276                 return EXCPT_CONTRIBUTORY;
 277         default:
 278                 break;
 279         }
 280         return EXCPT_BENIGN;
 281 }
 282
 283 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
 284                 unsigned nr, bool has_error, u32 error_code,
 285                 bool reinject)
 286 {
 287         u32 prev_nr;
 288         int class1, class2;
 289
 290         kvm_make_request(KVM_REQ_EVENT, vcpu);
 291
 292         if (!vcpu->arch.exception.pending) {
 293         queue:
 294                 vcpu->arch.exception.pending = true;
 295                 vcpu->arch.exception.has_error_code = has_error;
 296                 vcpu->arch.exception.nr = nr;
 297                 vcpu->arch.exception.error_code = error_code;
 298                 vcpu->arch.exception.reinject = reinject;
 299                 return;
 300         }
 301
 302         /* to check exception */
 303         prev_nr = vcpu->arch.exception.nr;
 304         if (prev_nr == DF_VECTOR) {
 305                 /* triple fault -> shutdown */
 306                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
 307                 return;
 308         }
 309         class1 = exception_class(prev_nr);
 310         class2 = exception_class(nr);
 311         if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
 312                 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
 313                 /* generate double fault per SDM Table 5-5 */
 314                 vcpu->arch.exception.pending = true;
 315                 vcpu->arch.exception.has_error_code = true;
 316                 vcpu->arch.exception.nr = DF_VECTOR;
 317                 vcpu->arch.exception.error_code = 0;
 318         } else
 319                 /* replace previous exception with a new one in a hope
 320                    that instruction re-execution will regenerate lost
 321                    exception */
 322                 goto queue;
 323 }
 324
 325 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 326 {
 327         kvm_multiple_exception(vcpu, nr, false, 0, false);
 328 }
 329 EXPORT_SYMBOL_GPL(kvm_queue_exception);
 330
 331 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
 332 {
 333         kvm_multiple_exception(vcpu, nr, false, 0, true);
 334 }
 335 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
 336
 337 void kvm_inject_page_fault(struct kvm_vcpu *vcpu)
 338 {
 339         unsigned error_code = vcpu->arch.fault.error_code;
 340
 341         ++vcpu->stat.pf_guest;
 342         vcpu->arch.cr2 = vcpu->arch.fault.address;
 343         kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
 344 }
 345
 346 void kvm_propagate_fault(struct kvm_vcpu *vcpu)
 347 {
 348         if (mmu_is_nested(vcpu) && !vcpu->arch.fault.nested)
 349                 vcpu->arch.nested_mmu.inject_page_fault(vcpu);
 350         else
 351                 vcpu->arch.mmu.inject_page_fault(vcpu);
 352
 353         vcpu->arch.fault.nested = false;
 354 }
 355
 356 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
 357 {
 358         kvm_make_request(KVM_REQ_EVENT, vcpu);
 359         vcpu->arch.nmi_pending = 1;
 360 }
 361 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
 362
 363 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 364 {
 365         kvm_multiple_exception(vcpu, nr, true, error_code, false);
 366 }
 367 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
 368
 369 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
 370 {
 371         kvm_multiple_exception(vcpu, nr, true, error_code, true);
 372 }
 373 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
 374
 375 /*
 376  * Checks if cpl <= required_cpl; if true, return true.  Otherwise queue
 377  * a #GP and return false.
 378  */
 379 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
 380 {
 381         if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
 382                 return true;
 383         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
 384         return false;
 385 }
 386 EXPORT_SYMBOL_GPL(kvm_require_cpl);
 387
 388 /*
 389  * This function will be used to read from the physical memory of the currently
 390  * running guest. The difference to kvm_read_guest_page is that this function
 391  * can read from guest physical or from the guest's guest physical memory.
 392  */
 393 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
 394                             gfn_t ngfn, void *data, int offset, int len,
 395                             u32 access)
 396 {
 397         gfn_t real_gfn;
 398         gpa_t ngpa;
 399
 400         ngpa     = gfn_to_gpa(ngfn);
 401         real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
 402         if (real_gfn == UNMAPPED_GVA)
 403                 return -EFAULT;
 404
 405         real_gfn = gpa_to_gfn(real_gfn);
 406
 407         return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
 408 }
 409 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
 410
 411 int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
 412                                void *data, int offset, int len, u32 access)
 413 {
 414         return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
 415                                        data, offset, len, access);
 416 }
 417
 418 /*
 419  * Load the pae pdptrs.  Return true is they are all valid.
 420  */
 421 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
 422 {
 423         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
 424         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
 425         int i;
 426         int ret;
 427         u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
 428
 429         ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
 430                                       offset * sizeof(u64), sizeof(pdpte),
 431                                       PFERR_USER_MASK|PFERR_WRITE_MASK);
 432         if (ret < 0) {
 433                 ret = 0;
 434                 goto out;
 435         }
 436         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
 437                 if (is_present_gpte(pdpte[i]) &&
 438                     (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
 439                         ret = 0;
 440                         goto out;
 441                 }
 442         }
 443         ret = 1;
 444
 445         memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
 446         __set_bit(VCPU_EXREG_PDPTR,
 447                   (unsigned long *)&vcpu->arch.regs_avail);
 448         __set_bit(VCPU_EXREG_PDPTR,
 449                   (unsigned long *)&vcpu->arch.regs_dirty);
 450 out:
 451
 452         return ret;
 453 }
 454 EXPORT_SYMBOL_GPL(load_pdptrs);
 455
 456 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
 457 {
 458         u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
 459         bool changed = true;
 460         int offset;
 461         gfn_t gfn;
 462         int r;
 463
 464         if (is_long_mode(vcpu) || !is_pae(vcpu))
 465                 return false;
 466
 467         if (!test_bit(VCPU_EXREG_PDPTR,
 468                       (unsigned long *)&vcpu->arch.regs_avail))
 469                 return true;
 470
 471         gfn = (vcpu->arch.cr3 & ~31u) >> PAGE_SHIFT;
 472         offset = (vcpu->arch.cr3 & ~31u) & (PAGE_SIZE - 1);
 473         r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
 474                                        PFERR_USER_MASK | PFERR_WRITE_MASK);
 475         if (r < 0)
 476                 goto out;
 477         changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
 478 out:
 479
 480         return changed;
 481 }
 482
 483 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
 484 {
 485         unsigned long old_cr0 = kvm_read_cr0(vcpu);
 486         unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
 487                                     X86_CR0_CD | X86_CR0_NW;
 488
 489         cr0 |= X86_CR0_ET;
 490
 491 #ifdef CONFIG_X86_64
 492         if (cr0 & 0xffffffff00000000UL)
 493                 return 1;
 494 #endif
 495
 496         cr0 &= ~CR0_RESERVED_BITS;
 497
 498         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
 499                 return 1;
 500
 501         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
 502                 return 1;
 503
 504         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
 505 #ifdef CONFIG_X86_64
 506                 if ((vcpu->arch.efer & EFER_LME)) {
 507                         int cs_db, cs_l;
 508
 509                         if (!is_pae(vcpu))
 510                                 return 1;
 511                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
 512                         if (cs_l)
 513                                 return 1;
 514                 } else
 515 #endif
 516                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
 517                                                  vcpu->arch.cr3))
 518                         return 1;
 519         }
 520
 521         kvm_x86_ops->set_cr0(vcpu, cr0);
 522
 523         if ((cr0 ^ old_cr0) & update_bits)
 524                 kvm_mmu_reset_context(vcpu);
 525         return 0;
 526 }
 527 EXPORT_SYMBOL_GPL(kvm_set_cr0);
 528
 529 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
 530 {
 531         (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
 532 }
 533 EXPORT_SYMBOL_GPL(kvm_lmsw);
 534
 535 int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 536 {
 537         u64 xcr0;
 538
 539         /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now  */
 540         if (index != XCR_XFEATURE_ENABLED_MASK)
 541                 return 1;
 542         xcr0 = xcr;
 543         if (kvm_x86_ops->get_cpl(vcpu) != 0)
 544                 return 1;
 545         if (!(xcr0 & XSTATE_FP))
 546                 return 1;
 547         if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
 548                 return 1;
 549         if (xcr0 & ~host_xcr0)
 550                 return 1;
 551         vcpu->arch.xcr0 = xcr0;
 552         vcpu->guest_xcr0_loaded = 0;
 553         return 0;
 554 }
 555
 556 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
 557 {
 558         if (__kvm_set_xcr(vcpu, index, xcr)) {
 559                 kvm_inject_gp(vcpu, 0);
 560                 return 1;
 561         }
 562         return 0;
 563 }
 564 EXPORT_SYMBOL_GPL(kvm_set_xcr);
 565
 566 static bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu)
 567 {
 568         struct kvm_cpuid_entry2 *best;
 569
 570         best = kvm_find_cpuid_entry(vcpu, 1, 0);
 571         return best && (best->ecx & bit(X86_FEATURE_XSAVE));
 572 }
 573
 574 static void update_cpuid(struct kvm_vcpu *vcpu)
 575 {
 576         struct kvm_cpuid_entry2 *best;
 577
 578         best = kvm_find_cpuid_entry(vcpu, 1, 0);
 579         if (!best)
 580                 return;
 581
 582         /* Update OSXSAVE bit */
 583         if (cpu_has_xsave && best->function == 0x1) {
 584                 best->ecx &= ~(bit(X86_FEATURE_OSXSAVE));
 585                 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
 586                         best->ecx |= bit(X86_FEATURE_OSXSAVE);
 587         }
 588 }
 589
 590 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
 591 {
 592         unsigned long old_cr4 = kvm_read_cr4(vcpu);
 593         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
 594
 595         if (cr4 & CR4_RESERVED_BITS)
 596                 return 1;
 597
 598         if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
 599                 return 1;
 600
 601         if (is_long_mode(vcpu)) {
 602                 if (!(cr4 & X86_CR4_PAE))
 603                         return 1;
 604         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
 605                    && ((cr4 ^ old_cr4) & pdptr_bits)
 606                    && !load_pdptrs(vcpu, vcpu->arch.walk_mmu, vcpu->arch.cr3))
 607                 return 1;
 608
 609         if (cr4 & X86_CR4_VMXE)
 610                 return 1;
 611
 612         kvm_x86_ops->set_cr4(vcpu, cr4);
 613
 614         if ((cr4 ^ old_cr4) & pdptr_bits)
 615                 kvm_mmu_reset_context(vcpu);
 616
 617         if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
 618                 update_cpuid(vcpu);
 619
 620         return 0;
 621 }
 622 EXPORT_SYMBOL_GPL(kvm_set_cr4);
 623
 624 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
 625 {
 626         if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
 627                 kvm_mmu_sync_roots(vcpu);
 628                 kvm_mmu_flush_tlb(vcpu);
 629                 return 0;
 630         }
 631
 632         if (is_long_mode(vcpu)) {
 633                 if (cr3 & CR3_L_MODE_RESERVED_BITS)
 634                         return 1;
 635         } else {
 636                 if (is_pae(vcpu)) {
 637                         if (cr3 & CR3_PAE_RESERVED_BITS)
 638                                 return 1;
 639                         if (is_paging(vcpu) &&
 640                             !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
 641                                 return 1;
 642                 }
 643                 /*
 644                  * We don't check reserved bits in nonpae mode, because
 645                  * this isn't enforced, and VMware depends on this.
 646                  */
 647         }
 648
 649         /*
 650          * Does the new cr3 value map to physical memory? (Note, we
 651          * catch an invalid cr3 even in real-mode, because it would
 652          * cause trouble later on when we turn on paging anyway.)
 653          *
 654          * A real CPU would silently accept an invalid cr3 and would
 655          * attempt to use it - with largely undefined (and often hard
 656          * to debug) behavior on the guest side.
 657          */
 658         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
 659                 return 1;
 660         vcpu->arch.cr3 = cr3;
 661         vcpu->arch.mmu.new_cr3(vcpu);
 662         return 0;
 663 }
 664 EXPORT_SYMBOL_GPL(kvm_set_cr3);
 665
 666 int __kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 667 {
 668         if (cr8 & CR8_RESERVED_BITS)
 669                 return 1;
 670         if (irqchip_in_kernel(vcpu->kvm))
 671                 kvm_lapic_set_tpr(vcpu, cr8);
 672         else
 673                 vcpu->arch.cr8 = cr8;
 674         return 0;
 675 }
 676
 677 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
 678 {
 679         if (__kvm_set_cr8(vcpu, cr8))
 680                 kvm_inject_gp(vcpu, 0);
 681 }
 682 EXPORT_SYMBOL_GPL(kvm_set_cr8);
 683
 684 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
 685 {
 686         if (irqchip_in_kernel(vcpu->kvm))
 687                 return kvm_lapic_get_cr8(vcpu);
 688         else
 689                 return vcpu->arch.cr8;
 690 }
 691 EXPORT_SYMBOL_GPL(kvm_get_cr8);
 692
 693 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 694 {
 695         switch (dr) {
 696         case 0 ... 3:
 697                 vcpu->arch.db[dr] = val;
 698                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
 699                         vcpu->arch.eff_db[dr] = val;
 700                 break;
 701         case 4:
 702                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 703                         return 1; /* #UD */
 704                 /* fall through */
 705         case 6:
 706                 if (val & 0xffffffff00000000ULL)
 707                         return -1; /* #GP */
 708                 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
 709                 break;
 710         case 5:
 711                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 712                         return 1; /* #UD */
 713                 /* fall through */
 714         default: /* 7 */
 715                 if (val & 0xffffffff00000000ULL)
 716                         return -1; /* #GP */
 717                 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
 718                 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
 719                         kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
 720                         vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
 721                 }
 722                 break;
 723         }
 724
 725         return 0;
 726 }
 727
 728 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
 729 {
 730         int res;
 731
 732         res = __kvm_set_dr(vcpu, dr, val);
 733         if (res > 0)
 734                 kvm_queue_exception(vcpu, UD_VECTOR);
 735         else if (res < 0)
 736                 kvm_inject_gp(vcpu, 0);
 737
 738         return res;
 739 }
 740 EXPORT_SYMBOL_GPL(kvm_set_dr);
 741
 742 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 743 {
 744         switch (dr) {
 745         case 0 ... 3:
 746                 *val = vcpu->arch.db[dr];
 747                 break;
 748         case 4:
 749                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 750                         return 1;
 751                 /* fall through */
 752         case 6:
 753                 *val = vcpu->arch.dr6;
 754                 break;
 755         case 5:
 756                 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
 757                         return 1;
 758                 /* fall through */
 759         default: /* 7 */
 760                 *val = vcpu->arch.dr7;
 761                 break;
 762         }
 763
 764         return 0;
 765 }
 766
 767 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
 768 {
 769         if (_kvm_get_dr(vcpu, dr, val)) {
 770                 kvm_queue_exception(vcpu, UD_VECTOR);
 771                 return 1;
 772         }
 773         return 0;
 774 }
 775 EXPORT_SYMBOL_GPL(kvm_get_dr);
 776
 777 /*
 778  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 779  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
 780  *
 781  * This list is modified at module load time to reflect the
 782  * capabilities of the host cpu. This capabilities test skips MSRs that are
 783  * kvm-specific. Those are put in the beginning of the list.
 784  */
 785
 786 #define KVM_SAVE_MSRS_BEGIN     7
 787 static u32 msrs_to_save[] = {
 788         MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
 789         MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
 790         HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
 791         HV_X64_MSR_APIC_ASSIST_PAGE,
 792         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
 793         MSR_STAR,
 794 #ifdef CONFIG_X86_64
 795         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
 796 #endif
 797         MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
 798 };
 799
 800 static unsigned num_msrs_to_save;
 801
 802 static u32 emulated_msrs[] = {
 803         MSR_IA32_MISC_ENABLE,
 804         MSR_IA32_MCG_STATUS,
 805         MSR_IA32_MCG_CTL,
 806 };
 807
 808 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
 809 {
 810         u64 old_efer = vcpu->arch.efer;
 811
 812         if (efer & efer_reserved_bits)
 813                 return 1;
 814
 815         if (is_paging(vcpu)
 816             && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
 817                 return 1;
 818
 819         if (efer & EFER_FFXSR) {
 820                 struct kvm_cpuid_entry2 *feat;
 821
 822                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 823                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
 824                         return 1;
 825         }
 826
 827         if (efer & EFER_SVME) {
 828                 struct kvm_cpuid_entry2 *feat;
 829
 830                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
 831                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
 832                         return 1;
 833         }
 834
 835         efer &= ~EFER_LMA;
 836         efer |= vcpu->arch.efer & EFER_LMA;
 837
 838         kvm_x86_ops->set_efer(vcpu, efer);
 839
 840         vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
 841
 842         /* Update reserved bits */
 843         if ((efer ^ old_efer) & EFER_NX)
 844                 kvm_mmu_reset_context(vcpu);
 845
 846         return 0;
 847 }
 848
 849 void kvm_enable_efer_bits(u64 mask)
 850 {
 851        efer_reserved_bits &= ~mask;
 852 }
 853 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
 854
 855
 856 /*
 857  * Writes msr value into into the appropriate "register".
 858  * Returns 0 on success, non-0 otherwise.
 859  * Assumes vcpu_load() was already called.
 860  */
 861 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
 862 {
 863         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
 864 }
 865
 866 /*
 867  * Adapt set_msr() to msr_io()'s calling convention
 868  */
 869 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
 870 {
 871         return kvm_set_msr(vcpu, index, *data);
 872 }
 873
 874 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
 875 {
 876         int version;
 877         int r;
 878         struct pvclock_wall_clock wc;
 879         struct timespec boot;
 880
 881         if (!wall_clock)
 882                 return;
 883
 884         r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
 885         if (r)
 886                 return;
 887
 888         if (version & 1)
 889                 ++version;  /* first time write, random junk */
 890
 891         ++version;
 892
 893         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 894
 895         /*
 896          * The guest calculates current wall clock time by adding
 897          * system time (updated by kvm_guest_time_update below) to the
 898          * wall clock specified here.  guest system time equals host
 899          * system time for us, thus we must fill in host boot time here.
 900          */
 901         getboottime(&boot);
 902
 903         wc.sec = boot.tv_sec;
 904         wc.nsec = boot.tv_nsec;
 905         wc.version = version;
 906
 907         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
 908
 909         version++;
 910         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
 911 }
 912
 913 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
 914 {
 915         uint32_t quotient, remainder;
 916
 917         /* Don't try to replace with do_div(), this one calculates
 918          * "(dividend << 32) / divisor" */
 919         __asm__ ( "divl %4"
 920                   : "=a" (quotient), "=d" (remainder)
 921                   : "0" (0), "1" (dividend), "r" (divisor) );
 922         return quotient;
 923 }
 924
 925 static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
 926                                s8 *pshift, u32 *pmultiplier)
 927 {
 928         uint64_t scaled64;
 929         int32_t  shift = 0;
 930         uint64_t tps64;
 931         uint32_t tps32;
 932
 933         tps64 = base_khz * 1000LL;
 934         scaled64 = scaled_khz * 1000LL;
 935         while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
 936                 tps64 >>= 1;
 937                 shift--;
 938         }
 939
 940         tps32 = (uint32_t)tps64;
 941         while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
 942                 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
 943                         scaled64 >>= 1;
 944                 else
 945                         tps32 <<= 1;
 946                 shift++;
 947         }
 948
 949         *pshift = shift;
 950         *pmultiplier = div_frac(scaled64, tps32);
 951
 952         pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
 953                  __func__, base_khz, scaled_khz, shift, *pmultiplier);
 954 }
 955
 956 static inline u64 get_kernel_ns(void)
 957 {
 958         struct timespec ts;
 959
 960         WARN_ON(preemptible());
 961         ktime_get_ts(&ts);
 962         monotonic_to_bootbased(&ts);
 963         return timespec_to_ns(&ts);
 964 }
 965
 966 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
 967 unsigned long max_tsc_khz;
 968
 969 static inline int kvm_tsc_changes_freq(void)
 970 {
 971         int cpu = get_cpu();
 972         int ret = !boot_cpu_has(X86_FEATURE_CONSTANT_TSC) &&
 973                   cpufreq_quick_get(cpu) != 0;
 974         put_cpu();
 975         return ret;
 976 }
 977
 978 static inline u64 nsec_to_cycles(u64 nsec)
 979 {
 980         u64 ret;
 981
 982         WARN_ON(preemptible());
 983         if (kvm_tsc_changes_freq())
 984                 printk_once(KERN_WARNING
 985                  "kvm: unreliable cycle conversion on adjustable rate TSC\n");
 986         ret = nsec * __get_cpu_var(cpu_tsc_khz);
 987         do_div(ret, USEC_PER_SEC);
 988         return ret;
 989 }
 990
 991 static void kvm_arch_set_tsc_khz(struct kvm *kvm, u32 this_tsc_khz)
 992 {
 993         /* Compute a scale to convert nanoseconds in TSC cycles */
 994         kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
 995                            &kvm->arch.virtual_tsc_shift,
 996                            &kvm->arch.virtual_tsc_mult);
 997         kvm->arch.virtual_tsc_khz = this_tsc_khz;
 998 }
 999
1000 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1001 {
1002         u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.last_tsc_nsec,
1003                                       vcpu->kvm->arch.virtual_tsc_mult,
1004                                       vcpu->kvm->arch.virtual_tsc_shift);
1005         tsc += vcpu->arch.last_tsc_write;
1006         return tsc;
1007 }
1008
1009 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
1010 {
1011         struct kvm *kvm = vcpu->kvm;
1012         u64 offset, ns, elapsed;
1013         unsigned long flags;
1014         s64 sdiff;
1015
1016         spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1017         offset = data - native_read_tsc();
1018         ns = get_kernel_ns();
1019         elapsed = ns - kvm->arch.last_tsc_nsec;
1020         sdiff = data - kvm->arch.last_tsc_write;
1021         if (sdiff < 0)
1022                 sdiff = -sdiff;
1023
1024         /*
1025          * Special case: close write to TSC within 5 seconds of
1026          * another CPU is interpreted as an attempt to synchronize
1027          * The 5 seconds is to accomodate host load / swapping as
1028          * well as any reset of TSC during the boot process.
1029          *
1030          * In that case, for a reliable TSC, we can match TSC offsets,
1031          * or make a best guest using elapsed value.
1032          */
1033         if (sdiff < nsec_to_cycles(5ULL * NSEC_PER_SEC) &&
1034             elapsed < 5ULL * NSEC_PER_SEC) {
1035                 if (!check_tsc_unstable()) {
1036                         offset = kvm->arch.last_tsc_offset;
1037                         pr_debug("kvm: matched tsc offset for %llu\n", data);
1038                 } else {
1039                         u64 delta = nsec_to_cycles(elapsed);
1040                         offset += delta;
1041                         pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1042                 }
1043                 ns = kvm->arch.last_tsc_nsec;
1044         }
1045         kvm->arch.last_tsc_nsec = ns;
1046         kvm->arch.last_tsc_write = data;
1047         kvm->arch.last_tsc_offset = offset;
1048         kvm_x86_ops->write_tsc_offset(vcpu, offset);
1049         spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1050
1051         /* Reset of TSC must disable overshoot protection below */
1052         vcpu->arch.hv_clock.tsc_timestamp = 0;
1053         vcpu->arch.last_tsc_write = data;
1054         vcpu->arch.last_tsc_nsec = ns;
1055 }
1056 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1057
1058 static int kvm_guest_time_update(struct kvm_vcpu *v)
1059 {
1060         unsigned long flags;
1061         struct kvm_vcpu_arch *vcpu = &v->arch;
1062         void *shared_kaddr;
1063         unsigned long this_tsc_khz;
1064         s64 kernel_ns, max_kernel_ns;
1065         u64 tsc_timestamp;
1066
1067         /* Keep irq disabled to prevent changes to the clock */
1068         local_irq_save(flags);
1069         kvm_get_msr(v, MSR_IA32_TSC, &tsc_timestamp);
1070         kernel_ns = get_kernel_ns();
1071         this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
1072
1073         if (unlikely(this_tsc_khz == 0)) {
1074                 local_irq_restore(flags);
1075                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1076                 return 1;
1077         }
1078
1079         /*
1080          * We may have to catch up the TSC to match elapsed wall clock
1081          * time for two reasons, even if kvmclock is used.
1082          *   1) CPU could have been running below the maximum TSC rate
1083          *   2) Broken TSC compensation resets the base at each VCPU
1084          *      entry to avoid unknown leaps of TSC even when running
1085          *      again on the same CPU.  This may cause apparent elapsed
1086          *      time to disappear, and the guest to stand still or run
1087          *      very slowly.
1088          */
1089         if (vcpu->tsc_catchup) {
1090                 u64 tsc = compute_guest_tsc(v, kernel_ns);
1091                 if (tsc > tsc_timestamp) {
1092                         kvm_x86_ops->adjust_tsc_offset(v, tsc - tsc_timestamp);
1093                         tsc_timestamp = tsc;
1094                 }
1095         }
1096
1097         local_irq_restore(flags);
1098
1099         if (!vcpu->time_page)
1100                 return 0;
1101
1102         /*
1103          * Time as measured by the TSC may go backwards when resetting the base
1104          * tsc_timestamp.  The reason for this is that the TSC resolution is
1105          * higher than the resolution of the other clock scales.  Thus, many
1106          * possible measurments of the TSC correspond to one measurement of any
1107          * other clock, and so a spread of values is possible.  This is not a
1108          * problem for the computation of the nanosecond clock; with TSC rates
1109          * around 1GHZ, there can only be a few cycles which correspond to one
1110          * nanosecond value, and any path through this code will inevitably
1111          * take longer than that.  However, with the kernel_ns value itself,
1112          * the precision may be much lower, down to HZ granularity.  If the
1113          * first sampling of TSC against kernel_ns ends in the low part of the
1114          * range, and the second in the high end of the range, we can get:
1115          *
1116          * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
1117          *
1118          * As the sampling errors potentially range in the thousands of cycles,
1119          * it is possible such a time value has already been observed by the
1120          * guest.  To protect against this, we must compute the system time as
1121          * observed by the guest and ensure the new system time is greater.
1122          */
1123         max_kernel_ns = 0;
1124         if (vcpu->hv_clock.tsc_timestamp && vcpu->last_guest_tsc) {
1125                 max_kernel_ns = vcpu->last_guest_tsc -
1126                                 vcpu->hv_clock.tsc_timestamp;
1127                 max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
1128                                     vcpu->hv_clock.tsc_to_system_mul,
1129                                     vcpu->hv_clock.tsc_shift);
1130                 max_kernel_ns += vcpu->last_kernel_ns;
1131         }
1132
1133         if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
1134                 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1135                                    &vcpu->hv_clock.tsc_shift,
1136                                    &vcpu->hv_clock.tsc_to_system_mul);
1137                 vcpu->hw_tsc_khz = this_tsc_khz;
1138         }
1139
1140         if (max_kernel_ns > kernel_ns)
1141                 kernel_ns = max_kernel_ns;
1142
1143         /* With all the info we got, fill in the values */
1144         vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
1145         vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
1146         vcpu->last_kernel_ns = kernel_ns;
1147         vcpu->last_guest_tsc = tsc_timestamp;
1148         vcpu->hv_clock.flags = 0;
1149
1150         /*
1151          * The interface expects us to write an even number signaling that the
1152          * update is finished. Since the guest won't see the intermediate
1153          * state, we just increase by 2 at the end.
1154          */
1155         vcpu->hv_clock.version += 2;
1156
1157         shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
1158
1159         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
1160                sizeof(vcpu->hv_clock));
1161
1162         kunmap_atomic(shared_kaddr, KM_USER0);
1163
1164         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
1165         return 0;
1166 }
1167
1168 static bool msr_mtrr_valid(unsigned msr)
1169 {
1170         switch (msr) {
1171         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1172         case MSR_MTRRfix64K_00000:
1173         case MSR_MTRRfix16K_80000:
1174         case MSR_MTRRfix16K_A0000:
1175         case MSR_MTRRfix4K_C0000:
1176         case MSR_MTRRfix4K_C8000:
1177         case MSR_MTRRfix4K_D0000:
1178         case MSR_MTRRfix4K_D8000:
1179         case MSR_MTRRfix4K_E0000:
1180         case MSR_MTRRfix4K_E8000:
1181         case MSR_MTRRfix4K_F0000:
1182         case MSR_MTRRfix4K_F8000:
1183         case MSR_MTRRdefType:
1184         case MSR_IA32_CR_PAT:
1185                 return true;
1186         case 0x2f8:
1187                 return true;
1188         }
1189         return false;
1190 }
1191
1192 static bool valid_pat_type(unsigned t)
1193 {
1194         return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1195 }
1196
1197 static bool valid_mtrr_type(unsigned t)
1198 {
1199         return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1200 }
1201
1202 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1203 {
1204         int i;
1205
1206         if (!msr_mtrr_valid(msr))
1207                 return false;
1208
1209         if (msr == MSR_IA32_CR_PAT) {
1210                 for (i = 0; i < 8; i++)
1211                         if (!valid_pat_type((data >> (i * 8)) & 0xff))
1212                                 return false;
1213                 return true;
1214         } else if (msr == MSR_MTRRdefType) {
1215                 if (data & ~0xcff)
1216                         return false;
1217                 return valid_mtrr_type(data & 0xff);
1218         } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1219                 for (i = 0; i < 8 ; i++)
1220                         if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1221                                 return false;
1222                 return true;
1223         }
1224
1225         /* variable MTRRs */
1226         return valid_mtrr_type(data & 0xff);
1227 }
1228
1229 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1230 {
1231         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1232
1233         if (!mtrr_valid(vcpu, msr, data))
1234                 return 1;
1235
1236         if (msr == MSR_MTRRdefType) {
1237                 vcpu->arch.mtrr_state.def_type = data;
1238                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1239         } else if (msr == MSR_MTRRfix64K_00000)
1240                 p[0] = data;
1241         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1242                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1243         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1244                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1245         else if (msr == MSR_IA32_CR_PAT)
1246                 vcpu->arch.pat = data;
1247         else {  /* Variable MTRRs */
1248                 int idx, is_mtrr_mask;
1249                 u64 *pt;
1250
1251                 idx = (msr - 0x200) / 2;
1252                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1253                 if (!is_mtrr_mask)
1254                         pt =
1255                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1256                 else
1257                         pt =
1258                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1259                 *pt = data;
1260         }
1261
1262         kvm_mmu_reset_context(vcpu);
1263         return 0;
1264 }
1265
1266 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1267 {
1268         u64 mcg_cap = vcpu->arch.mcg_cap;
1269         unsigned bank_num = mcg_cap & 0xff;
1270
1271         switch (msr) {
1272         case MSR_IA32_MCG_STATUS:
1273                 vcpu->arch.mcg_status = data;
1274                 break;
1275         case MSR_IA32_MCG_CTL:
1276                 if (!(mcg_cap & MCG_CTL_P))
1277                         return 1;
1278                 if (data != 0 && data != ~(u64)0)
1279                         return -1;
1280                 vcpu->arch.mcg_ctl = data;
1281                 break;
1282         default:
1283                 if (msr >= MSR_IA32_MC0_CTL &&
1284                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1285                         u32 offset = msr - MSR_IA32_MC0_CTL;
1286                         /* only 0 or all 1s can be written to IA32_MCi_CTL
1287                          * some Linux kernels though clear bit 10 in bank 4 to
1288                          * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1289                          * this to avoid an uncatched #GP in the guest
1290                          */
1291                         if ((offset & 0x3) == 0 &&
1292                             data != 0 && (data | (1 << 10)) != ~(u64)0)
1293                                 return -1;
1294                         vcpu->arch.mce_banks[offset] = data;
1295                         break;
1296                 }
1297                 return 1;
1298         }
1299         return 0;
1300 }
1301
1302 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1303 {
1304         struct kvm *kvm = vcpu->kvm;
1305         int lm = is_long_mode(vcpu);
1306         u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1307                 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1308         u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1309                 : kvm->arch.xen_hvm_config.blob_size_32;
1310         u32 page_num = data & ~PAGE_MASK;
1311         u64 page_addr = data & PAGE_MASK;
1312         u8 *page;
1313         int r;
1314
1315         r = -E2BIG;
1316         if (page_num >= blob_size)
1317                 goto out;
1318         r = -ENOMEM;
1319         page = kzalloc(PAGE_SIZE, GFP_KERNEL);
1320         if (!page)
1321                 goto out;
1322         r = -EFAULT;
1323         if (copy_from_user(page, blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE))
1324                 goto out_free;
1325         if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1326                 goto out_free;
1327         r = 0;
1328 out_free:
1329         kfree(page);
1330 out:
1331         return r;
1332 }
1333
1334 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1335 {
1336         return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1337 }
1338
1339 static bool kvm_hv_msr_partition_wide(u32 msr)
1340 {
1341         bool r = false;
1342         switch (msr) {
1343         case HV_X64_MSR_GUEST_OS_ID:
1344         case HV_X64_MSR_HYPERCALL:
1345                 r = true;
1346                 break;
1347         }
1348
1349         return r;
1350 }
1351
1352 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1353 {
1354         struct kvm *kvm = vcpu->kvm;
1355
1356         switch (msr) {
1357         case HV_X64_MSR_GUEST_OS_ID:
1358                 kvm->arch.hv_guest_os_id = data;
1359                 /* setting guest os id to zero disables hypercall page */
1360                 if (!kvm->arch.hv_guest_os_id)
1361                         kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1362                 break;
1363         case HV_X64_MSR_HYPERCALL: {
1364                 u64 gfn;
1365                 unsigned long addr;
1366                 u8 instructions[4];
1367
1368                 /* if guest os id is not set hypercall should remain disabled */
1369                 if (!kvm->arch.hv_guest_os_id)
1370                         break;
1371                 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1372                         kvm->arch.hv_hypercall = data;
1373                         break;
1374                 }
1375                 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1376                 addr = gfn_to_hva(kvm, gfn);
1377                 if (kvm_is_error_hva(addr))
1378                         return 1;
1379                 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1380                 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1381                 if (copy_to_user((void __user *)addr, instructions, 4))
1382                         return 1;
1383                 kvm->arch.hv_hypercall = data;
1384                 break;
1385         }
1386         default:
1387                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1388                           "data 0x%llx\n", msr, data);
1389                 return 1;
1390         }
1391         return 0;
1392 }
1393
1394 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1395 {
1396         switch (msr) {
1397         case HV_X64_MSR_APIC_ASSIST_PAGE: {
1398                 unsigned long addr;
1399
1400                 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1401                         vcpu->arch.hv_vapic = data;
1402                         break;
1403                 }
1404                 addr = gfn_to_hva(vcpu->kvm, data >>
1405                                   HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1406                 if (kvm_is_error_hva(addr))
1407                         return 1;
1408                 if (clear_user((void __user *)addr, PAGE_SIZE))
1409                         return 1;
1410                 vcpu->arch.hv_vapic = data;
1411                 break;
1412         }
1413         case HV_X64_MSR_EOI:
1414                 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1415         case HV_X64_MSR_ICR:
1416                 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1417         case HV_X64_MSR_TPR:
1418                 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1419         default:
1420                 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1421                           "data 0x%llx\n", msr, data);
1422                 return 1;
1423         }
1424
1425         return 0;
1426 }
1427
1428 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1429 {
1430         switch (msr) {
1431         case MSR_EFER:
1432                 return set_efer(vcpu, data);
1433         case MSR_K7_HWCR:
1434                 data &= ~(u64)0x40;     /* ignore flush filter disable */
1435                 data &= ~(u64)0x100;    /* ignore ignne emulation enable */
1436                 if (data != 0) {
1437                         pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1438                                 data);
1439                         return 1;
1440                 }
1441                 break;
1442         case MSR_FAM10H_MMIO_CONF_BASE:
1443                 if (data != 0) {
1444                         pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1445                                 "0x%llx\n", data);
1446                         return 1;
1447                 }
1448                 break;
1449         case MSR_AMD64_NB_CFG:
1450                 break;
1451         case MSR_IA32_DEBUGCTLMSR:
1452                 if (!data) {
1453                         /* We support the non-activated case already */
1454                         break;
1455                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1456                         /* Values other than LBR and BTF are vendor-specific,
1457                            thus reserved and should throw a #GP */
1458                         return 1;
1459                 }
1460                 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1461                         __func__, data);
1462                 break;
1463         case MSR_IA32_UCODE_REV:
1464         case MSR_IA32_UCODE_WRITE:
1465         case MSR_VM_HSAVE_PA:
1466         case MSR_AMD64_PATCH_LOADER:
1467                 break;
1468         case 0x200 ... 0x2ff:
1469                 return set_msr_mtrr(vcpu, msr, data);
1470         case MSR_IA32_APICBASE:
1471                 kvm_set_apic_base(vcpu, data);
1472                 break;
1473         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1474                 return kvm_x2apic_msr_write(vcpu, msr, data);
1475         case MSR_IA32_MISC_ENABLE:
1476                 vcpu->arch.ia32_misc_enable_msr = data;
1477                 break;
1478         case MSR_KVM_WALL_CLOCK_NEW:
1479         case MSR_KVM_WALL_CLOCK:
1480                 vcpu->kvm->arch.wall_clock = data;
1481                 kvm_write_wall_clock(vcpu->kvm, data);
1482                 break;
1483         case MSR_KVM_SYSTEM_TIME_NEW:
1484         case MSR_KVM_SYSTEM_TIME: {
1485                 if (vcpu->arch.time_page) {
1486                         kvm_release_page_dirty(vcpu->arch.time_page);
1487                         vcpu->arch.time_page = NULL;
1488                 }
1489
1490                 vcpu->arch.time = data;
1491                 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1492
1493                 /* we verify if the enable bit is set... */
1494                 if (!(data & 1))
1495                         break;
1496
1497                 /* ...but clean it before doing the actual write */
1498                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1499
1500                 vcpu->arch.time_page =
1501                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1502
1503                 if (is_error_page(vcpu->arch.time_page)) {
1504                         kvm_release_page_clean(vcpu->arch.time_page);
1505                         vcpu->arch.time_page = NULL;
1506                 }
1507                 break;
1508         }
1509         case MSR_IA32_MCG_CTL:
1510         case MSR_IA32_MCG_STATUS:
1511         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1512                 return set_msr_mce(vcpu, msr, data);
1513
1514         /* Performance counters are not protected by a CPUID bit,
1515          * so we should check all of them in the generic path for the sake of
1516          * cross vendor migration.
1517          * Writing a zero into the event select MSRs disables them,
1518          * which we perfectly emulate ;-). Any other value should be at least
1519          * reported, some guests depend on them.
1520          */
1521         case MSR_P6_EVNTSEL0:
1522         case MSR_P6_EVNTSEL1:
1523         case MSR_K7_EVNTSEL0:
1524         case MSR_K7_EVNTSEL1:
1525         case MSR_K7_EVNTSEL2:
1526         case MSR_K7_EVNTSEL3:
1527                 if (data != 0)
1528                         pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1529                                 "0x%x data 0x%llx\n", msr, data);
1530                 break;
1531         /* at least RHEL 4 unconditionally writes to the perfctr registers,
1532          * so we ignore writes to make it happy.
1533          */
1534         case MSR_P6_PERFCTR0:
1535         case MSR_P6_PERFCTR1:
1536         case MSR_K7_PERFCTR0:
1537         case MSR_K7_PERFCTR1:
1538         case MSR_K7_PERFCTR2:
1539         case MSR_K7_PERFCTR3:
1540                 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1541                         "0x%x data 0x%llx\n", msr, data);
1542                 break;
1543         case MSR_K7_CLK_CTL:
1544                 /*
1545                  * Ignore all writes to this no longer documented MSR.
1546                  * Writes are only relevant for old K7 processors,
1547                  * all pre-dating SVM, but a recommended workaround from
1548                  * AMD for these chips. It is possible to speicify the
1549                  * affected processor models on the command line, hence
1550                  * the need to ignore the workaround.
1551                  */
1552                 break;
1553         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1554                 if (kvm_hv_msr_partition_wide(msr)) {
1555                         int r;
1556                         mutex_lock(&vcpu->kvm->lock);
1557                         r = set_msr_hyperv_pw(vcpu, msr, data);
1558                         mutex_unlock(&vcpu->kvm->lock);
1559                         return r;
1560                 } else
1561                         return set_msr_hyperv(vcpu, msr, data);
1562                 break;
1563         default:
1564                 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1565                         return xen_hvm_config(vcpu, data);
1566                 if (!ignore_msrs) {
1567                         pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1568                                 msr, data);
1569                         return 1;
1570                 } else {
1571                         pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1572                                 msr, data);
1573                         break;
1574                 }
1575         }
1576         return 0;
1577 }
1578 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1579
1580
1581 /*
1582  * Reads an msr value (of 'msr_index') into 'pdata'.
1583  * Returns 0 on success, non-0 otherwise.
1584  * Assumes vcpu_load() was already called.
1585  */
1586 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1587 {
1588         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1589 }
1590
1591 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1592 {
1593         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1594
1595         if (!msr_mtrr_valid(msr))
1596                 return 1;
1597
1598         if (msr == MSR_MTRRdefType)
1599                 *pdata = vcpu->arch.mtrr_state.def_type +
1600                          (vcpu->arch.mtrr_state.enabled << 10);
1601         else if (msr == MSR_MTRRfix64K_00000)
1602                 *pdata = p[0];
1603         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1604                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1605         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1606                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1607         else if (msr == MSR_IA32_CR_PAT)
1608                 *pdata = vcpu->arch.pat;
1609         else {  /* Variable MTRRs */
1610                 int idx, is_mtrr_mask;
1611                 u64 *pt;
1612
1613                 idx = (msr - 0x200) / 2;
1614                 is_mtrr_mask = msr - 0x200 - 2 * idx;
1615                 if (!is_mtrr_mask)
1616                         pt =
1617                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1618                 else
1619                         pt =
1620                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1621                 *pdata = *pt;
1622         }
1623
1624         return 0;
1625 }
1626
1627 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1628 {
1629         u64 data;
1630         u64 mcg_cap = vcpu->arch.mcg_cap;
1631         unsigned bank_num = mcg_cap & 0xff;
1632
1633         switch (msr) {
1634         case MSR_IA32_P5_MC_ADDR:
1635         case MSR_IA32_P5_MC_TYPE:
1636                 data = 0;
1637                 break;
1638         case MSR_IA32_MCG_CAP:
1639                 data = vcpu->arch.mcg_cap;
1640                 break;
1641         case MSR_IA32_MCG_CTL:
1642                 if (!(mcg_cap & MCG_CTL_P))
1643                         return 1;
1644                 data = vcpu->arch.mcg_ctl;
1645                 break;
1646         case MSR_IA32_MCG_STATUS:
1647                 data = vcpu->arch.mcg_status;
1648                 break;
1649         default:
1650                 if (msr >= MSR_IA32_MC0_CTL &&
1651                     msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1652                         u32 offset = msr - MSR_IA32_MC0_CTL;
1653                         data = vcpu->arch.mce_banks[offset];
1654                         break;
1655                 }
1656                 return 1;
1657         }
1658         *pdata = data;
1659         return 0;
1660 }
1661
1662 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1663 {
1664         u64 data = 0;
1665         struct kvm *kvm = vcpu->kvm;
1666
1667         switch (msr) {
1668         case HV_X64_MSR_GUEST_OS_ID:
1669                 data = kvm->arch.hv_guest_os_id;
1670                 break;
1671         case HV_X64_MSR_HYPERCALL:
1672                 data = kvm->arch.hv_hypercall;
1673                 break;
1674         default:
1675                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1676                 return 1;
1677         }
1678
1679         *pdata = data;
1680         return 0;
1681 }
1682
1683 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1684 {
1685         u64 data = 0;
1686
1687         switch (msr) {
1688         case HV_X64_MSR_VP_INDEX: {
1689                 int r;
1690                 struct kvm_vcpu *v;
1691                 kvm_for_each_vcpu(r, v, vcpu->kvm)
1692                         if (v == vcpu)
1693                                 data = r;
1694                 break;
1695         }
1696         case HV_X64_MSR_EOI:
1697                 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1698         case HV_X64_MSR_ICR:
1699                 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1700         case HV_X64_MSR_TPR:
1701                 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1702         default:
1703                 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1704                 return 1;
1705         }
1706         *pdata = data;
1707         return 0;
1708 }
1709
1710 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1711 {
1712         u64 data;
1713
1714         switch (msr) {
1715         case MSR_IA32_PLATFORM_ID:
1716         case MSR_IA32_UCODE_REV:
1717         case MSR_IA32_EBL_CR_POWERON:
1718         case MSR_IA32_DEBUGCTLMSR:
1719         case MSR_IA32_LASTBRANCHFROMIP:
1720         case MSR_IA32_LASTBRANCHTOIP:
1721         case MSR_IA32_LASTINTFROMIP:
1722         case MSR_IA32_LASTINTTOIP:
1723         case MSR_K8_SYSCFG:
1724         case MSR_K7_HWCR:
1725         case MSR_VM_HSAVE_PA:
1726         case MSR_P6_PERFCTR0:
1727         case MSR_P6_PERFCTR1:
1728         case MSR_P6_EVNTSEL0:
1729         case MSR_P6_EVNTSEL1:
1730         case MSR_K7_EVNTSEL0:
1731         case MSR_K7_PERFCTR0:
1732         case MSR_K8_INT_PENDING_MSG:
1733         case MSR_AMD64_NB_CFG:
1734         case MSR_FAM10H_MMIO_CONF_BASE:
1735                 data = 0;
1736                 break;
1737         case MSR_MTRRcap:
1738                 data = 0x500 | KVM_NR_VAR_MTRR;
1739                 break;
1740         case 0x200 ... 0x2ff:
1741                 return get_msr_mtrr(vcpu, msr, pdata);
1742         case 0xcd: /* fsb frequency */
1743                 data = 3;
1744                 break;
1745                 /*
1746                  * MSR_EBC_FREQUENCY_ID
1747                  * Conservative value valid for even the basic CPU models.
1748                  * Models 0,1: 000 in bits 23:21 indicating a bus speed of
1749                  * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
1750                  * and 266MHz for model 3, or 4. Set Core Clock
1751                  * Frequency to System Bus Frequency Ratio to 1 (bits
1752                  * 31:24) even though these are only valid for CPU
1753                  * models > 2, however guests may end up dividing or
1754                  * multiplying by zero otherwise.
1755                  */
1756         case MSR_EBC_FREQUENCY_ID:
1757                 data = 1 << 24;
1758                 break;
1759         case MSR_IA32_APICBASE:
1760                 data = kvm_get_apic_base(vcpu);
1761                 break;
1762         case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1763                 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1764                 break;
1765         case MSR_IA32_MISC_ENABLE:
1766                 data = vcpu->arch.ia32_misc_enable_msr;
1767                 break;
1768         case MSR_IA32_PERF_STATUS:
1769                 /* TSC increment by tick */
1770                 data = 1000ULL;
1771                 /* CPU multiplier */
1772                 data |= (((uint64_t)4ULL) << 40);
1773                 break;
1774         case MSR_EFER:
1775                 data = vcpu->arch.efer;
1776                 break;
1777         case MSR_KVM_WALL_CLOCK:
1778         case MSR_KVM_WALL_CLOCK_NEW:
1779                 data = vcpu->kvm->arch.wall_clock;
1780                 break;
1781         case MSR_KVM_SYSTEM_TIME:
1782         case MSR_KVM_SYSTEM_TIME_NEW:
1783                 data = vcpu->arch.time;
1784                 break;
1785         case MSR_IA32_P5_MC_ADDR:
1786         case MSR_IA32_P5_MC_TYPE:
1787         case MSR_IA32_MCG_CAP:
1788         case MSR_IA32_MCG_CTL:
1789         case MSR_IA32_MCG_STATUS:
1790         case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1791                 return get_msr_mce(vcpu, msr, pdata);
1792         case MSR_K7_CLK_CTL:
1793                 /*
1794                  * Provide expected ramp-up count for K7. All other
1795                  * are set to zero, indicating minimum divisors for
1796                  * every field.
1797                  *
1798                  * This prevents guest kernels on AMD host with CPU
1799                  * type 6, model 8 and higher from exploding due to
1800                  * the rdmsr failing.
1801                  */
1802                 data = 0x20000000;
1803                 break;
1804         case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1805                 if (kvm_hv_msr_partition_wide(msr)) {
1806                         int r;
1807                         mutex_lock(&vcpu->kvm->lock);
1808                         r = get_msr_hyperv_pw(vcpu, msr, pdata);
1809                         mutex_unlock(&vcpu->kvm->lock);
1810                         return r;
1811                 } else
1812                         return get_msr_hyperv(vcpu, msr, pdata);
1813                 break;
1814         default:
1815                 if (!ignore_msrs) {
1816                         pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1817                         return 1;
1818                 } else {
1819                         pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
1820                         data = 0;
1821                 }
1822                 break;
1823         }
1824         *pdata = data;
1825         return 0;
1826 }
1827 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1828
1829 /*
1830  * Read or write a bunch of msrs. All parameters are kernel addresses.
1831  *
1832  * @return number of msrs set successfully.
1833  */
1834 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1835                     struct kvm_msr_entry *entries,
1836                     int (*do_msr)(struct kvm_vcpu *vcpu,
1837                                   unsigned index, u64 *data))
1838 {
1839         int i, idx;
1840
1841         idx = srcu_read_lock(&vcpu->kvm->srcu);
1842         for (i = 0; i < msrs->nmsrs; ++i)
1843                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1844                         break;
1845         srcu_read_unlock(&vcpu->kvm->srcu, idx);
1846
1847         return i;
1848 }
1849
1850 /*
1851  * Read or write a bunch of msrs. Parameters are user addresses.
1852  *
1853  * @return number of msrs set successfully.
1854  */
1855 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1856                   int (*do_msr)(struct kvm_vcpu *vcpu,
1857                                 unsigned index, u64 *data),
1858                   int writeback)
1859 {
1860         struct kvm_msrs msrs;
1861         struct kvm_msr_entry *entries;
1862         int r, n;
1863         unsigned size;
1864
1865         r = -EFAULT;
1866         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1867                 goto out;
1868
1869         r = -E2BIG;
1870         if (msrs.nmsrs >= MAX_IO_MSRS)
1871                 goto out;
1872
1873         r = -ENOMEM;
1874         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1875         entries = kmalloc(size, GFP_KERNEL);
1876         if (!entries)
1877                 goto out;
1878
1879         r = -EFAULT;
1880         if (copy_from_user(entries, user_msrs->entries, size))
1881                 goto out_free;
1882
1883         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1884         if (r < 0)
1885                 goto out_free;
1886
1887         r = -EFAULT;
1888         if (writeback && copy_to_user(user_msrs->entries, entries, size))
1889                 goto out_free;
1890
1891         r = n;
1892
1893 out_free:
1894         kfree(entries);
1895 out:
1896         return r;
1897 }
1898
1899 int kvm_dev_ioctl_check_extension(long ext)
1900 {
1901         int r;
1902
1903         switch (ext) {
1904         case KVM_CAP_IRQCHIP:
1905         case KVM_CAP_HLT:
1906         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1907         case KVM_CAP_SET_TSS_ADDR:
1908         case KVM_CAP_EXT_CPUID:
1909         case KVM_CAP_CLOCKSOURCE:
1910         case KVM_CAP_PIT:
1911         case KVM_CAP_NOP_IO_DELAY:
1912         case KVM_CAP_MP_STATE:
1913         case KVM_CAP_SYNC_MMU:
1914         case KVM_CAP_REINJECT_CONTROL:
1915         case KVM_CAP_IRQ_INJECT_STATUS:
1916         case KVM_CAP_ASSIGN_DEV_IRQ:
1917         case KVM_CAP_IRQFD:
1918         case KVM_CAP_IOEVENTFD:
1919         case KVM_CAP_PIT2:
1920         case KVM_CAP_PIT_STATE2:
1921         case KVM_CAP_SET_IDENTITY_MAP_ADDR:
1922         case KVM_CAP_XEN_HVM:
1923         case KVM_CAP_ADJUST_CLOCK:
1924         case KVM_CAP_VCPU_EVENTS:
1925         case KVM_CAP_HYPERV:
1926         case KVM_CAP_HYPERV_VAPIC:
1927         case KVM_CAP_HYPERV_SPIN:
1928         case KVM_CAP_PCI_SEGMENT:
1929         case KVM_CAP_DEBUGREGS:
1930         case KVM_CAP_X86_ROBUST_SINGLESTEP:
1931         case KVM_CAP_XSAVE:
1932                 r = 1;
1933                 break;
1934         case KVM_CAP_COALESCED_MMIO:
1935                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
1936                 break;
1937         case KVM_CAP_VAPIC:
1938                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
1939                 break;
1940         case KVM_CAP_NR_VCPUS:
1941                 r = KVM_MAX_VCPUS;
1942                 break;
1943         case KVM_CAP_NR_MEMSLOTS:
1944                 r = KVM_MEMORY_SLOTS;
1945                 break;
1946         case KVM_CAP_PV_MMU:    /* obsolete */
1947                 r = 0;
1948                 break;
1949         case KVM_CAP_IOMMU:
1950                 r = iommu_found();
1951                 break;
1952         case KVM_CAP_MCE:
1953                 r = KVM_MAX_MCE_BANKS;
1954                 break;
1955         case KVM_CAP_XCRS:
1956                 r = cpu_has_xsave;
1957                 break;
1958         default:
1959                 r = 0;
1960                 break;
1961         }
1962         return r;
1963
1964 }
1965
1966 long kvm_arch_dev_ioctl(struct file *filp,
1967                         unsigned int ioctl, unsigned long arg)
1968 {
1969         void __user *argp = (void __user *)arg;
1970         long r;
1971
1972         switch (ioctl) {
1973         case KVM_GET_MSR_INDEX_LIST: {
1974                 struct kvm_msr_list __user *user_msr_list = argp;
1975                 struct kvm_msr_list msr_list;
1976                 unsigned n;
1977
1978                 r = -EFAULT;
1979                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1980                         goto out;
1981                 n = msr_list.nmsrs;
1982                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1983                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1984                         goto out;
1985                 r = -E2BIG;
1986                 if (n < msr_list.nmsrs)
1987                         goto out;
1988                 r = -EFAULT;
1989                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1990                                  num_msrs_to_save * sizeof(u32)))
1991                         goto out;
1992                 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
1993                                  &emulated_msrs,
1994                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1995                         goto out;
1996                 r = 0;
1997                 break;
1998         }
1999         case KVM_GET_SUPPORTED_CPUID: {
2000                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2001                 struct kvm_cpuid2 cpuid;
2002
2003                 r = -EFAULT;
2004                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2005                         goto out;
2006                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
2007                                                       cpuid_arg->entries);
2008                 if (r)
2009                         goto out;
2010
2011                 r = -EFAULT;
2012                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2013                         goto out;
2014                 r = 0;
2015                 break;
2016         }
2017         case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2018                 u64 mce_cap;
2019
2020                 mce_cap = KVM_MCE_CAP_SUPPORTED;
2021                 r = -EFAULT;
2022                 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2023                         goto out;
2024                 r = 0;
2025                 break;
2026         }
2027         default:
2028                 r = -EINVAL;
2029         }
2030 out:
2031         return r;
2032 }
2033
2034 static void wbinvd_ipi(void *garbage)
2035 {
2036         wbinvd();
2037 }
2038
2039 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2040 {
2041         return vcpu->kvm->arch.iommu_domain &&
2042                 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
2043 }
2044
2045 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2046 {
2047         /* Address WBINVD may be executed by guest */
2048         if (need_emulate_wbinvd(vcpu)) {
2049                 if (kvm_x86_ops->has_wbinvd_exit())
2050                         cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2051                 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2052                         smp_call_function_single(vcpu->cpu,
2053                                         wbinvd_ipi, NULL, 1);
2054         }
2055
2056         kvm_x86_ops->vcpu_load(vcpu, cpu);
2057         if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
2058                 /* Make sure TSC doesn't go backwards */
2059                 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
2060                                 native_read_tsc() - vcpu->arch.last_host_tsc;
2061                 if (tsc_delta < 0)
2062                         mark_tsc_unstable("KVM discovered backwards TSC");
2063                 if (check_tsc_unstable()) {
2064                         kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
2065                         vcpu->arch.tsc_catchup = 1;
2066                         kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2067                 }
2068                 if (vcpu->cpu != cpu)
2069                         kvm_migrate_timers(vcpu);
2070                 vcpu->cpu = cpu;
2071         }
2072 }
2073
2074 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2075 {
2076         kvm_x86_ops->vcpu_put(vcpu);
2077         kvm_put_guest_fpu(vcpu);
2078         vcpu->arch.last_host_tsc = native_read_tsc();
2079 }
2080
2081 static int is_efer_nx(void)
2082 {
2083         unsigned long long efer = 0;
2084
2085         rdmsrl_safe(MSR_EFER, &efer);
2086         return efer & EFER_NX;
2087 }
2088
2089 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2090 {
2091         int i;
2092         struct kvm_cpuid_entry2 *e, *entry;
2093
2094         entry = NULL;
2095         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2096                 e = &vcpu->arch.cpuid_entries[i];
2097                 if (e->function == 0x80000001) {
2098                         entry = e;
2099                         break;
2100                 }
2101         }
2102         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
2103                 entry->edx &= ~(1 << 20);
2104                 printk(KERN_INFO "kvm: guest NX capability removed\n");
2105         }
2106 }
2107
2108 /* when an old userspace process fills a new kernel module */
2109 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2110                                     struct kvm_cpuid *cpuid,
2111                                     struct kvm_cpuid_entry __user *entries)
2112 {
2113         int r, i;
2114         struct kvm_cpuid_entry *cpuid_entries;
2115
2116         r = -E2BIG;
2117         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2118                 goto out;
2119         r = -ENOMEM;
2120         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
2121         if (!cpuid_entries)
2122                 goto out;
2123         r = -EFAULT;
2124         if (copy_from_user(cpuid_entries, entries,
2125                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2126                 goto out_free;
2127         for (i = 0; i < cpuid->nent; i++) {
2128                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
2129                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
2130                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
2131                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
2132                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
2133                 vcpu->arch.cpuid_entries[i].index = 0;
2134                 vcpu->arch.cpuid_entries[i].flags = 0;
2135                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
2136                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
2137                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
2138         }
2139         vcpu->arch.cpuid_nent = cpuid->nent;
2140         cpuid_fix_nx_cap(vcpu);
2141         r = 0;
2142         kvm_apic_set_version(vcpu);
2143         kvm_x86_ops->cpuid_update(vcpu);
2144         update_cpuid(vcpu);
2145
2146 out_free:
2147         vfree(cpuid_entries);
2148 out:
2149         return r;
2150 }
2151
2152 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
2153                                      struct kvm_cpuid2 *cpuid,
2154                                      struct kvm_cpuid_entry2 __user *entries)
2155 {
2156         int r;
2157
2158         r = -E2BIG;
2159         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2160                 goto out;
2161         r = -EFAULT;
2162         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
2163                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
2164                 goto out;
2165         vcpu->arch.cpuid_nent = cpuid->nent;
2166         kvm_apic_set_version(vcpu);
2167         kvm_x86_ops->cpuid_update(vcpu);
2168         update_cpuid(vcpu);
2169         return 0;
2170
2171 out:
2172         return r;
2173 }
2174
2175 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
2176                                      struct kvm_cpuid2 *cpuid,
2177                                      struct kvm_cpuid_entry2 __user *entries)
2178 {
2179         int r;
2180
2181         r = -E2BIG;
2182         if (cpuid->nent < vcpu->arch.cpuid_nent)
2183                 goto out;
2184         r = -EFAULT;
2185         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
2186                          vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
2187                 goto out;
2188         return 0;
2189
2190 out:
2191         cpuid->nent = vcpu->arch.cpuid_nent;
2192         return r;
2193 }
2194
2195 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
2196                            u32 index)
2197 {
2198         entry->function = function;
2199         entry->index = index;
2200         cpuid_count(entry->function, entry->index,
2201                     &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
2202         entry->flags = 0;
2203 }
2204
2205 #define F(x) bit(X86_FEATURE_##x)
2206
2207 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
2208                          u32 index, int *nent, int maxnent)
2209 {
2210         unsigned f_nx = is_efer_nx() ? F(NX) : 0;
2211 #ifdef CONFIG_X86_64
2212         unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
2213                                 ? F(GBPAGES) : 0;
2214         unsigned f_lm = F(LM);
2215 #else
2216         unsigned f_gbpages = 0;
2217         unsigned f_lm = 0;
2218 #endif
2219         unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
2220
2221         /* cpuid 1.edx */
2222         const u32 kvm_supported_word0_x86_features =
2223                 F(FPU) | F(VME) | F(DE) | F(PSE) |
2224                 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
2225                 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
2226                 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
2227                 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
2228                 0 /* Reserved, DS, ACPI */ | F(MMX) |
2229                 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
2230                 0 /* HTT, TM, Reserved, PBE */;
2231         /* cpuid 0x80000001.edx */
2232         const u32 kvm_supported_word1_x86_features =
2233                 F(FPU) | F(VME) | F(DE) | F(PSE) |
2234                 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
2235                 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
2236                 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
2237                 F(PAT) | F(PSE36) | 0 /* Reserved */ |
2238                 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
2239                 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
2240                 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
2241         /* cpuid 1.ecx */
2242         const u32 kvm_supported_word4_x86_features =
2243                 F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
2244                 0 /* DS-CPL, VMX, SMX, EST */ |
2245                 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
2246                 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
2247                 0 /* Reserved, DCA */ | F(XMM4_1) |
2248                 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
2249                 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
2250                 F(F16C);
2251         /* cpuid 0x80000001.ecx */
2252         const u32 kvm_supported_word6_x86_features =
2253                 F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
2254                 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
2255                 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
2256                 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
2257
2258         /* all calls to cpuid_count() should be made on the same cpu */
2259         get_cpu();
2260         do_cpuid_1_ent(entry, function, index);
2261         ++*nent;
2262
2263         switch (function) {
2264         case 0:
2265                 entry->eax = min(entry->eax, (u32)0xd);
2266                 break;
2267         case 1:
2268                 entry->edx &= kvm_supported_word0_x86_features;
2269                 entry->ecx &= kvm_supported_word4_x86_features;
2270                 /* we support x2apic emulation even if host does not support
2271                  * it since we emulate x2apic in software */
2272                 entry->ecx |= F(X2APIC);
2273                 break;
2274         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
2275          * may return different values. This forces us to get_cpu() before
2276          * issuing the first command, and also to emulate this annoying behavior
2277          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
2278         case 2: {
2279                 int t, times = entry->eax & 0xff;
2280
2281                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
2282                 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2283                 for (t = 1; t < times && *nent < maxnent; ++t) {
2284                         do_cpuid_1_ent(&entry[t], function, 0);
2285                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
2286                         ++*nent;
2287                 }
2288                 break;
2289         }
2290         /* function 4 and 0xb have additional index. */
2291         case 4: {
2292                 int i, cache_type;
2293
2294                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2295                 /* read more entries until cache_type is zero */
2296                 for (i = 1; *nent < maxnent; ++i) {
2297                         cache_type = entry[i - 1].eax & 0x1f;
2298                         if (!cache_type)
2299                                 break;
2300                         do_cpuid_1_ent(&entry[i], function, i);
2301                         entry[i].flags |=
2302                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2303                         ++*nent;
2304                 }
2305                 break;
2306         }
2307         case 0xb: {
2308                 int i, level_type;
2309
2310                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2311                 /* read more entries until level_type is zero */
2312                 for (i = 1; *nent < maxnent; ++i) {
2313                         level_type = entry[i - 1].ecx & 0xff00;
2314                         if (!level_type)
2315                                 break;
2316                         do_cpuid_1_ent(&entry[i], function, i);
2317                         entry[i].flags |=
2318                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2319                         ++*nent;
2320                 }
2321                 break;
2322         }
2323         case 0xd: {
2324                 int i;
2325
2326                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2327                 for (i = 1; *nent < maxnent; ++i) {
2328                         if (entry[i - 1].eax == 0 && i != 2)
2329                                 break;
2330                         do_cpuid_1_ent(&entry[i], function, i);
2331                         entry[i].flags |=
2332                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2333                         ++*nent;
2334                 }
2335                 break;
2336         }
2337         case KVM_CPUID_SIGNATURE: {
2338                 char signature[12] = "KVMKVMKVM\0\0";
2339                 u32 *sigptr = (u32 *)signature;
2340                 entry->eax = 0;
2341                 entry->ebx = sigptr[0];
2342                 entry->ecx = sigptr[1];
2343                 entry->edx = sigptr[2];
2344                 break;
2345         }
2346         case KVM_CPUID_FEATURES:
2347                 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
2348                              (1 << KVM_FEATURE_NOP_IO_DELAY) |
2349                              (1 << KVM_FEATURE_CLOCKSOURCE2) |
2350                              (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
2351                 entry->ebx = 0;
2352                 entry->ecx = 0;
2353                 entry->edx = 0;
2354                 break;
2355         case 0x80000000:
2356                 entry->eax = min(entry->eax, 0x8000001a);
2357                 break;
2358         case 0x80000001:
2359                 entry->edx &= kvm_supported_word1_x86_features;
2360                 entry->ecx &= kvm_supported_word6_x86_features;
2361                 break;
2362         }
2363
2364         kvm_x86_ops->set_supported_cpuid(function, entry);
2365
2366         put_cpu();
2367 }
2368
2369 #undef F
2370
2371 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
2372                                      struct kvm_cpuid_entry2 __user *entries)
2373 {
2374         struct kvm_cpuid_entry2 *cpuid_entries;
2375         int limit, nent = 0, r = -E2BIG;
2376         u32 func;
2377
2378         if (cpuid->nent < 1)
2379                 goto out;
2380         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2381                 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
2382         r = -ENOMEM;
2383         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
2384         if (!cpuid_entries)
2385                 goto out;
2386
2387         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
2388         limit = cpuid_entries[0].eax;
2389         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
2390                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2391                              &nent, cpuid->nent);
2392         r = -E2BIG;
2393         if (nent >= cpuid->nent)
2394                 goto out_free;
2395
2396         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
2397         limit = cpuid_entries[nent - 1].eax;
2398         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
2399                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2400                              &nent, cpuid->nent);
2401
2402
2403
2404         r = -E2BIG;
2405         if (nent >= cpuid->nent)
2406                 goto out_free;
2407
2408         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
2409                      cpuid->nent);
2410
2411         r = -E2BIG;
2412         if (nent >= cpuid->nent)
2413                 goto out_free;
2414
2415         do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent,
2416                      cpuid->nent);
2417
2418         r = -E2BIG;
2419         if (nent >= cpuid->nent)
2420                 goto out_free;
2421
2422         r = -EFAULT;
2423         if (copy_to_user(entries, cpuid_entries,
2424                          nent * sizeof(struct kvm_cpuid_entry2)))
2425                 goto out_free;
2426         cpuid->nent = nent;
2427         r = 0;
2428
2429 out_free:
2430         vfree(cpuid_entries);
2431 out:
2432         return r;
2433 }
2434
2435 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2436                                     struct kvm_lapic_state *s)
2437 {
2438         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2439
2440         return 0;
2441 }
2442
2443 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2444                                     struct kvm_lapic_state *s)
2445 {
2446         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2447         kvm_apic_post_state_restore(vcpu);
2448         update_cr8_intercept(vcpu);
2449
2450         return 0;
2451 }
2452
2453 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2454                                     struct kvm_interrupt *irq)
2455 {
2456         if (irq->irq < 0 || irq->irq >= 256)
2457                 return -EINVAL;
2458         if (irqchip_in_kernel(vcpu->kvm))
2459                 return -ENXIO;
2460
2461         kvm_queue_interrupt(vcpu, irq->irq, false);
2462         kvm_make_request(KVM_REQ_EVENT, vcpu);
2463
2464         return 0;
2465 }
2466
2467 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2468 {
2469         kvm_inject_nmi(vcpu);
2470
2471         return 0;
2472 }
2473
2474 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2475                                            struct kvm_tpr_access_ctl *tac)
2476 {
2477         if (tac->flags)
2478                 return -EINVAL;
2479         vcpu->arch.tpr_access_reporting = !!tac->enabled;
2480         return 0;
2481 }
2482
2483 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2484                                         u64 mcg_cap)
2485 {
2486         int r;
2487         unsigned bank_num = mcg_cap & 0xff, bank;
2488
2489         r = -EINVAL;
2490         if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2491                 goto out;
2492         if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2493                 goto out;
2494         r = 0;
2495         vcpu->arch.mcg_cap = mcg_cap;
2496         /* Init IA32_MCG_CTL to all 1s */
2497         if (mcg_cap & MCG_CTL_P)
2498                 vcpu->arch.mcg_ctl = ~(u64)0;
2499         /* Init IA32_MCi_CTL to all 1s */
2500         for (bank = 0; bank < bank_num; bank++)
2501                 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2502 out:
2503         return r;
2504 }
2505
2506 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2507                                       struct kvm_x86_mce *mce)
2508 {
2509         u64 mcg_cap = vcpu->arch.mcg_cap;
2510         unsigned bank_num = mcg_cap & 0xff;
2511         u64 *banks = vcpu->arch.mce_banks;
2512
2513         if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2514                 return -EINVAL;
2515         /*
2516          * if IA32_MCG_CTL is not all 1s, the uncorrected error
2517          * reporting is disabled
2518          */
2519         if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2520             vcpu->arch.mcg_ctl != ~(u64)0)
2521                 return 0;
2522         banks += 4 * mce->bank;
2523         /*
2524          * if IA32_MCi_CTL is not all 1s, the uncorrected error
2525          * reporting is disabled for the bank
2526          */
2527         if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2528                 return 0;
2529         if (mce->status & MCI_STATUS_UC) {
2530                 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2531                     !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2532                         printk(KERN_DEBUG "kvm: set_mce: "
2533                                "injects mce exception while "
2534                                "previous one is in progress!\n");
2535                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2536                         return 0;
2537                 }
2538                 if (banks[1] & MCI_STATUS_VAL)
2539                         mce->status |= MCI_STATUS_OVER;
2540                 banks[2] = mce->addr;
2541                 banks[3] = mce->misc;
2542                 vcpu->arch.mcg_status = mce->mcg_status;
2543                 banks[1] = mce->status;
2544                 kvm_queue_exception(vcpu, MC_VECTOR);
2545         } else if (!(banks[1] & MCI_STATUS_VAL)
2546                    || !(banks[1] & MCI_STATUS_UC)) {
2547                 if (banks[1] & MCI_STATUS_VAL)
2548                         mce->status |= MCI_STATUS_OVER;
2549                 banks[2] = mce->addr;
2550                 banks[3] = mce->misc;
2551                 banks[1] = mce->status;
2552         } else
2553                 banks[1] |= MCI_STATUS_OVER;
2554         return 0;
2555 }
2556
2557 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2558                                                struct kvm_vcpu_events *events)
2559 {
2560         events->exception.injected =
2561                 vcpu->arch.exception.pending &&
2562                 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2563         events->exception.nr = vcpu->arch.exception.nr;
2564         events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2565         events->exception.pad = 0;
2566         events->exception.error_code = vcpu->arch.exception.error_code;
2567
2568         events->interrupt.injected =
2569                 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2570         events->interrupt.nr = vcpu->arch.interrupt.nr;
2571         events->interrupt.soft = 0;
2572         events->interrupt.shadow =
2573                 kvm_x86_ops->get_interrupt_shadow(vcpu,
2574                         KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2575
2576         events->nmi.injected = vcpu->arch.nmi_injected;
2577         events->nmi.pending = vcpu->arch.nmi_pending;
2578         events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2579         events->nmi.pad = 0;
2580
2581         events->sipi_vector = vcpu->arch.sipi_vector;
2582
2583         events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2584                          | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2585                          | KVM_VCPUEVENT_VALID_SHADOW);
2586         memset(&events->reserved, 0, sizeof(events->reserved));
2587 }
2588
2589 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2590                                               struct kvm_vcpu_events *events)
2591 {
2592         if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2593                               | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2594                               | KVM_VCPUEVENT_VALID_SHADOW))
2595                 return -EINVAL;
2596
2597         vcpu->arch.exception.pending = events->exception.injected;
2598         vcpu->arch.exception.nr = events->exception.nr;
2599         vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2600         vcpu->arch.exception.error_code = events->exception.error_code;
2601
2602         vcpu->arch.interrupt.pending = events->interrupt.injected;
2603         vcpu->arch.interrupt.nr = events->interrupt.nr;
2604         vcpu->arch.interrupt.soft = events->interrupt.soft;
2605         if (vcpu->arch.interrupt.pending && irqchip_in_kernel(vcpu->kvm))
2606                 kvm_pic_clear_isr_ack(vcpu->kvm);
2607         if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2608                 kvm_x86_ops->set_interrupt_shadow(vcpu,
2609                                                   events->interrupt.shadow);
2610
2611         vcpu->arch.nmi_injected = events->nmi.injected;
2612         if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2613                 vcpu->arch.nmi_pending = events->nmi.pending;
2614         kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2615
2616         if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2617                 vcpu->arch.sipi_vector = events->sipi_vector;
2618
2619         kvm_make_request(KVM_REQ_EVENT, vcpu);
2620
2621         return 0;
2622 }
2623
2624 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2625                                              struct kvm_debugregs *dbgregs)
2626 {
2627         memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2628         dbgregs->dr6 = vcpu->arch.dr6;
2629         dbgregs->dr7 = vcpu->arch.dr7;
2630         dbgregs->flags = 0;
2631         memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
2632 }
2633
2634 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2635                                             struct kvm_debugregs *dbgregs)
2636 {
2637         if (dbgregs->flags)
2638                 return -EINVAL;
2639
2640         memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2641         vcpu->arch.dr6 = dbgregs->dr6;
2642         vcpu->arch.dr7 = dbgregs->dr7;
2643
2644         return 0;
2645 }
2646
2647 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
2648                                          struct kvm_xsave *guest_xsave)
2649 {
2650         if (cpu_has_xsave)
2651                 memcpy(guest_xsave->region,
2652                         &vcpu->arch.guest_fpu.state->xsave,
2653                         xstate_size);
2654         else {
2655                 memcpy(guest_xsave->region,
2656                         &vcpu->arch.guest_fpu.state->fxsave,
2657                         sizeof(struct i387_fxsave_struct));
2658                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
2659                         XSTATE_FPSSE;
2660         }
2661 }
2662
2663 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
2664                                         struct kvm_xsave *guest_xsave)
2665 {
2666         u64 xstate_bv =
2667                 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
2668
2669         if (cpu_has_xsave)
2670                 memcpy(&vcpu->arch.guest_fpu.state->xsave,
2671                         guest_xsave->region, xstate_size);
2672         else {
2673                 if (xstate_bv & ~XSTATE_FPSSE)
2674                         return -EINVAL;
2675                 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
2676                         guest_xsave->region, sizeof(struct i387_fxsave_struct));
2677         }
2678         return 0;
2679 }
2680
2681 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
2682                                         struct kvm_xcrs *guest_xcrs)
2683 {
2684         if (!cpu_has_xsave) {
2685                 guest_xcrs->nr_xcrs = 0;
2686                 return;
2687         }
2688
2689         guest_xcrs->nr_xcrs = 1;
2690         guest_xcrs->flags = 0;
2691         guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
2692         guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
2693 }
2694
2695 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
2696                                        struct kvm_xcrs *guest_xcrs)
2697 {
2698         int i, r = 0;
2699
2700         if (!cpu_has_xsave)
2701                 return -EINVAL;
2702
2703         if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
2704                 return -EINVAL;
2705
2706         for (i = 0; i < guest_xcrs->nr_xcrs; i++)
2707                 /* Only support XCR0 currently */
2708                 if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
2709                         r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
2710                                 guest_xcrs->xcrs[0].value);
2711                         break;
2712                 }
2713         if (r)
2714                 r = -EINVAL;
2715         return r;
2716 }
2717
2718 long kvm_arch_vcpu_ioctl(struct file *filp,
2719                          unsigned int ioctl, unsigned long arg)
2720 {
2721         struct kvm_vcpu *vcpu = filp->private_data;
2722         void __user *argp = (void __user *)arg;
2723         int r;
2724         union {
2725                 struct kvm_lapic_state *lapic;
2726                 struct kvm_xsave *xsave;
2727                 struct kvm_xcrs *xcrs;
2728                 void *buffer;
2729         } u;
2730
2731         u.buffer = NULL;
2732         switch (ioctl) {
2733         case KVM_GET_LAPIC: {
2734                 r = -EINVAL;
2735                 if (!vcpu->arch.apic)
2736                         goto out;
2737                 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2738
2739                 r = -ENOMEM;
2740                 if (!u.lapic)
2741                         goto out;
2742                 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
2743                 if (r)
2744                         goto out;
2745                 r = -EFAULT;
2746                 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
2747                         goto out;
2748                 r = 0;
2749                 break;
2750         }
2751         case KVM_SET_LAPIC: {
2752                 r = -EINVAL;
2753                 if (!vcpu->arch.apic)
2754                         goto out;
2755                 u.lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2756                 r = -ENOMEM;
2757                 if (!u.lapic)
2758                         goto out;
2759                 r = -EFAULT;
2760                 if (copy_from_user(u.lapic, argp, sizeof(struct kvm_lapic_state)))
2761                         goto out;
2762                 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
2763                 if (r)
2764                         goto out;
2765                 r = 0;
2766                 break;
2767         }
2768         case KVM_INTERRUPT: {
2769                 struct kvm_interrupt irq;
2770
2771                 r = -EFAULT;
2772                 if (copy_from_user(&irq, argp, sizeof irq))
2773                         goto out;
2774                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2775                 if (r)
2776                         goto out;
2777                 r = 0;
2778                 break;
2779         }
2780         case KVM_NMI: {
2781                 r = kvm_vcpu_ioctl_nmi(vcpu);
2782                 if (r)
2783                         goto out;
2784                 r = 0;
2785                 break;
2786         }
2787         case KVM_SET_CPUID: {
2788                 struct kvm_cpuid __user *cpuid_arg = argp;
2789                 struct kvm_cpuid cpuid;
2790
2791                 r = -EFAULT;
2792                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2793                         goto out;
2794                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2795                 if (r)
2796                         goto out;
2797                 break;
2798         }
2799         case KVM_SET_CPUID2: {
2800                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2801                 struct kvm_cpuid2 cpuid;
2802
2803                 r = -EFAULT;
2804                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2805                         goto out;
2806                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2807                                               cpuid_arg->entries);
2808                 if (r)
2809                         goto out;
2810                 break;
2811         }
2812         case KVM_GET_CPUID2: {
2813                 struct kvm_cpuid2 __user *cpuid_arg = argp;
2814                 struct kvm_cpuid2 cpuid;
2815
2816                 r = -EFAULT;
2817                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2818                         goto out;
2819                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2820                                               cpuid_arg->entries);
2821                 if (r)
2822                         goto out;
2823                 r = -EFAULT;
2824                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2825                         goto out;
2826                 r = 0;
2827                 break;
2828         }
2829         case KVM_GET_MSRS:
2830                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2831                 break;
2832         case KVM_SET_MSRS:
2833                 r = msr_io(vcpu, argp, do_set_msr, 0);
2834                 break;
2835         case KVM_TPR_ACCESS_REPORTING: {
2836                 struct kvm_tpr_access_ctl tac;
2837
2838                 r = -EFAULT;
2839                 if (copy_from_user(&tac, argp, sizeof tac))
2840                         goto out;
2841                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2842                 if (r)
2843                         goto out;
2844                 r = -EFAULT;
2845                 if (copy_to_user(argp, &tac, sizeof tac))
2846                         goto out;
2847                 r = 0;
2848                 break;
2849         };
2850         case KVM_SET_VAPIC_ADDR: {
2851                 struct kvm_vapic_addr va;
2852
2853                 r = -EINVAL;
2854                 if (!irqchip_in_kernel(vcpu->kvm))
2855                         goto out;
2856                 r = -EFAULT;
2857                 if (copy_from_user(&va, argp, sizeof va))
2858                         goto out;
2859                 r = 0;
2860                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
2861                 break;
2862         }
2863         case KVM_X86_SETUP_MCE: {
2864                 u64 mcg_cap;
2865
2866                 r = -EFAULT;
2867                 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
2868                         goto out;
2869                 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
2870                 break;
2871         }
2872         case KVM_X86_SET_MCE: {
2873                 struct kvm_x86_mce mce;
2874
2875                 r = -EFAULT;
2876                 if (copy_from_user(&mce, argp, sizeof mce))
2877                         goto out;
2878                 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
2879                 break;
2880         }
2881         case KVM_GET_VCPU_EVENTS: {
2882                 struct kvm_vcpu_events events;
2883
2884                 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
2885
2886                 r = -EFAULT;
2887                 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
2888                         break;
2889                 r = 0;
2890                 break;
2891         }
2892         case KVM_SET_VCPU_EVENTS: {
2893                 struct kvm_vcpu_events events;
2894
2895                 r = -EFAULT;
2896                 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
2897                         break;
2898
2899                 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
2900                 break;
2901         }
2902         case KVM_GET_DEBUGREGS: {
2903                 struct kvm_debugregs dbgregs;
2904
2905                 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
2906
2907                 r = -EFAULT;
2908                 if (copy_to_user(argp, &dbgregs,
2909                                  sizeof(struct kvm_debugregs)))
2910                         break;
2911                 r = 0;
2912                 break;
2913         }
2914         case KVM_SET_DEBUGREGS: {
2915                 struct kvm_debugregs dbgregs;
2916
2917                 r = -EFAULT;
2918                 if (copy_from_user(&dbgregs, argp,
2919                                    sizeof(struct kvm_debugregs)))
2920                         break;
2921
2922                 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
2923                 break;
2924         }
2925         case KVM_GET_XSAVE: {
2926                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2927                 r = -ENOMEM;
2928                 if (!u.xsave)
2929                         break;
2930
2931                 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
2932
2933                 r = -EFAULT;
2934                 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
2935                         break;
2936                 r = 0;
2937                 break;
2938         }
2939         case KVM_SET_XSAVE: {
2940                 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2941                 r = -ENOMEM;
2942                 if (!u.xsave)
2943                         break;
2944
2945                 r = -EFAULT;
2946                 if (copy_from_user(u.xsave, argp, sizeof(struct kvm_xsave)))
2947                         break;
2948
2949                 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
2950                 break;
2951         }
2952         case KVM_GET_XCRS: {
2953                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
2954                 r = -ENOMEM;
2955                 if (!u.xcrs)
2956                         break;
2957
2958                 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
2959
2960                 r = -EFAULT;
2961                 if (copy_to_user(argp, u.xcrs,
2962                                  sizeof(struct kvm_xcrs)))
2963                         break;
2964                 r = 0;
2965                 break;
2966         }
2967         case KVM_SET_XCRS: {
2968                 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
2969                 r = -ENOMEM;
2970                 if (!u.xcrs)
2971                         break;
2972
2973                 r = -EFAULT;
2974                 if (copy_from_user(u.xcrs, argp,
2975                                    sizeof(struct kvm_xcrs)))
2976                         break;
2977
2978                 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
2979                 break;
2980         }
2981         default:
2982                 r = -EINVAL;
2983         }
2984 out:
2985         kfree(u.buffer);
2986         return r;
2987 }
2988
2989 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
2990 {
2991         int ret;
2992
2993         if (addr > (unsigned int)(-3 * PAGE_SIZE))
2994                 return -1;
2995         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
2996         return ret;
2997 }
2998
2999 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
3000                                               u64 ident_addr)
3001 {
3002         kvm->arch.ept_identity_map_addr = ident_addr;
3003         return 0;
3004 }
3005
3006 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
3007                                           u32 kvm_nr_mmu_pages)
3008 {
3009         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
3010                 return -EINVAL;
3011
3012         mutex_lock(&kvm->slots_lock);
3013         spin_lock(&kvm->mmu_lock);
3014
3015         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
3016         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
3017
3018         spin_unlock(&kvm->mmu_lock);
3019         mutex_unlock(&kvm->slots_lock);
3020         return 0;
3021 }
3022
3023 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
3024 {
3025         return kvm->arch.n_max_mmu_pages;
3026 }
3027
3028 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3029 {
3030         int r;
3031
3032         r = 0;
3033         switch (chip->chip_id) {
3034         case KVM_IRQCHIP_PIC_MASTER:
3035                 memcpy(&chip->chip.pic,
3036                         &pic_irqchip(kvm)->pics[0],
3037                         sizeof(struct kvm_pic_state));
3038                 break;
3039         case KVM_IRQCHIP_PIC_SLAVE:
3040                 memcpy(&chip->chip.pic,
3041                         &pic_irqchip(kvm)->pics[1],
3042                         sizeof(struct kvm_pic_state));
3043                 break;
3044         case KVM_IRQCHIP_IOAPIC:
3045                 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
3046                 break;
3047         default:
3048                 r = -EINVAL;
3049                 break;
3050         }
3051         return r;
3052 }
3053
3054 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3055 {
3056         int r;
3057
3058         r = 0;
3059         switch (chip->chip_id) {
3060         case KVM_IRQCHIP_PIC_MASTER:
3061                 spin_lock(&pic_irqchip(kvm)->lock);
3062                 memcpy(&pic_irqchip(kvm)->pics[0],
3063                         &chip->chip.pic,
3064                         sizeof(struct kvm_pic_state));
3065                 spin_unlock(&pic_irqchip(kvm)->lock);
3066                 break;
3067         case KVM_IRQCHIP_PIC_SLAVE:
3068                 spin_lock(&pic_irqchip(kvm)->lock);
3069                 memcpy(&pic_irqchip(kvm)->pics[1],
3070                         &chip->chip.pic,
3071                         sizeof(struct kvm_pic_state));
3072                 spin_unlock(&pic_irqchip(kvm)->lock);
3073                 break;
3074         case KVM_IRQCHIP_IOAPIC:
3075                 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
3076                 break;
3077         default:
3078                 r = -EINVAL;
3079                 break;
3080         }
3081         kvm_pic_update_irq(pic_irqchip(kvm));
3082         return r;
3083 }
3084
3085 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3086 {
3087         int r = 0;
3088
3089         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3090         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
3091         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3092         return r;
3093 }
3094
3095 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3096 {
3097         int r = 0;
3098
3099         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3100         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
3101         kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3102         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3103         return r;
3104 }
3105
3106 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3107 {
3108         int r = 0;
3109
3110         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3111         memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3112                 sizeof(ps->channels));
3113         ps->flags = kvm->arch.vpit->pit_state.flags;
3114         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3115         memset(&ps->reserved, 0, sizeof(ps->reserved));
3116         return r;
3117 }
3118
3119 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3120 {
3121         int r = 0, start = 0;
3122         u32 prev_legacy, cur_legacy;
3123         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3124         prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3125         cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3126         if (!prev_legacy && cur_legacy)
3127                 start = 1;
3128         memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3129                sizeof(kvm->arch.vpit->pit_state.channels));
3130         kvm->arch.vpit->pit_state.flags = ps->flags;
3131         kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
3132         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3133         return r;
3134 }
3135
3136 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3137                                  struct kvm_reinject_control *control)
3138 {
3139         if (!kvm->arch.vpit)
3140                 return -ENXIO;
3141         mutex_lock(&kvm->arch.vpit->pit_state.lock);
3142         kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
3143         mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3144         return 0;
3145 }
3146
3147 /*
3148  * Get (and clear) the dirty memory log for a memory slot.
3149  */
3150 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
3151                                       struct kvm_dirty_log *log)
3152 {
3153         int r, i;
3154         struct kvm_memory_slot *memslot;
3155         unsigned long n;
3156         unsigned long is_dirty = 0;
3157
3158         mutex_lock(&kvm->slots_lock);
3159
3160         r = -EINVAL;
3161         if (log->slot >= KVM_MEMORY_SLOTS)
3162                 goto out;
3163
3164         memslot = &kvm->memslots->memslots[log->slot];
3165         r = -ENOENT;
3166         if (!memslot->dirty_bitmap)
3167                 goto out;
3168
3169         n = kvm_dirty_bitmap_bytes(memslot);
3170
3171         for (i = 0; !is_dirty && i < n/sizeof(long); i++)
3172                 is_dirty = memslot->dirty_bitmap[i];
3173
3174         /* If nothing is dirty, don't bother messing with page tables. */
3175         if (is_dirty) {
3176                 struct kvm_memslots *slots, *old_slots;
3177                 unsigned long *dirty_bitmap;
3178
3179                 r = -ENOMEM;
3180                 dirty_bitmap = vmalloc(n);
3181                 if (!dirty_bitmap)
3182                         goto out;
3183                 memset(dirty_bitmap, 0, n);
3184
3185                 r = -ENOMEM;
3186                 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
3187                 if (!slots) {
3188                         vfree(dirty_bitmap);
3189                         goto out;
3190                 }
3191                 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
3192                 slots->memslots[log->slot].dirty_bitmap = dirty_bitmap;
3193
3194                 old_slots = kvm->memslots;
3195                 rcu_assign_pointer(kvm->memslots, slots);
3196                 synchronize_srcu_expedited(&kvm->srcu);
3197                 dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap;
3198                 kfree(old_slots);
3199
3200                 spin_lock(&kvm->mmu_lock);
3201                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
3202                 spin_unlock(&kvm->mmu_lock);
3203
3204                 r = -EFAULT;
3205                 if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n)) {
3206                         vfree(dirty_bitmap);
3207                         goto out;
3208                 }
3209                 vfree(dirty_bitmap);
3210         } else {
3211                 r = -EFAULT;
3212                 if (clear_user(log->dirty_bitmap, n))
3213                         goto out;
3214         }
3215
3216         r = 0;
3217 out:
3218         mutex_unlock(&kvm->slots_lock);
3219         return r;
3220 }
3221
3222 long kvm_arch_vm_ioctl(struct file *filp,
3223                        unsigned int ioctl, unsigned long arg)
3224 {
3225         struct kvm *kvm = filp->private_data;
3226         void __user *argp = (void __user *)arg;
3227         int r = -ENOTTY;
3228         /*
3229          * This union makes it completely explicit to gcc-3.x
3230          * that these two variables' stack usage should be
3231          * combined, not added together.
3232          */
3233         union {
3234                 struct kvm_pit_state ps;
3235                 struct kvm_pit_state2 ps2;
3236                 struct kvm_pit_config pit_config;
3237         } u;
3238
3239         switch (ioctl) {
3240         case KVM_SET_TSS_ADDR:
3241                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
3242                 if (r < 0)
3243                         goto out;
3244                 break;
3245         case KVM_SET_IDENTITY_MAP_ADDR: {
3246                 u64 ident_addr;
3247
3248                 r = -EFAULT;
3249                 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3250                         goto out;
3251                 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
3252                 if (r < 0)
3253                         goto out;
3254                 break;
3255         }
3256         case KVM_SET_NR_MMU_PAGES:
3257                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3258                 if (r)
3259                         goto out;
3260                 break;
3261         case KVM_GET_NR_MMU_PAGES:
3262                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3263                 break;
3264         case KVM_CREATE_IRQCHIP: {
3265                 struct kvm_pic *vpic;
3266
3267                 mutex_lock(&kvm->lock);
3268                 r = -EEXIST;
3269                 if (kvm->arch.vpic)
3270                         goto create_irqchip_unlock;
3271                 r = -ENOMEM;
3272                 vpic = kvm_create_pic(kvm);
3273                 if (vpic) {
3274                         r = kvm_ioapic_init(kvm);
3275                         if (r) {
3276                                 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3277                                                           &vpic->dev);
3278                                 kfree(vpic);
3279                                 goto create_irqchip_unlock;
3280                         }
3281                 } else
3282                         goto create_irqchip_unlock;
3283                 smp_wmb();
3284                 kvm->arch.vpic = vpic;
3285                 smp_wmb();
3286                 r = kvm_setup_default_irq_routing(kvm);
3287                 if (r) {
3288                         mutex_lock(&kvm->irq_lock);
3289                         kvm_ioapic_destroy(kvm);
3290                         kvm_destroy_pic(kvm);
3291                         mutex_unlock(&kvm->irq_lock);
3292                 }
3293         create_irqchip_unlock:
3294                 mutex_unlock(&kvm->lock);
3295                 break;
3296         }
3297         case KVM_CREATE_PIT:
3298                 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3299                 goto create_pit;
3300         case KVM_CREATE_PIT2:
3301                 r = -EFAULT;
3302                 if (copy_from_user(&u.pit_config, argp,
3303                                    sizeof(struct kvm_pit_config)))
3304                         goto out;
3305         create_pit:
3306                 mutex_lock(&kvm->slots_lock);
3307                 r = -EEXIST;
3308                 if (kvm->arch.vpit)
3309                         goto create_pit_unlock;
3310                 r = -ENOMEM;
3311                 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
3312                 if (kvm->arch.vpit)
3313                         r = 0;
3314         create_pit_unlock:
3315                 mutex_unlock(&kvm->slots_lock);
3316                 break;
3317         case KVM_IRQ_LINE_STATUS:
3318         case KVM_IRQ_LINE: {
3319                 struct kvm_irq_level irq_event;
3320
3321                 r = -EFAULT;
3322                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3323                         goto out;
3324                 r = -ENXIO;
3325                 if (irqchip_in_kernel(kvm)) {
3326                         __s32 status;
3327                         status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3328                                         irq_event.irq, irq_event.level);
3329                         if (ioctl == KVM_IRQ_LINE_STATUS) {
3330                                 r = -EFAULT;
3331                                 irq_event.status = status;
3332                                 if (copy_to_user(argp, &irq_event,
3333                                                         sizeof irq_event))
3334                                         goto out;
3335                         }
3336                         r = 0;
3337                 }
3338                 break;
3339         }
3340         case KVM_GET_IRQCHIP: {
3341                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3342                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3343
3344                 r = -ENOMEM;
3345                 if (!chip)
3346                         goto out;
3347                 r = -EFAULT;
3348                 if (copy_from_user(chip, argp, sizeof *chip))
3349                         goto get_irqchip_out;
3350                 r = -ENXIO;
3351                 if (!irqchip_in_kernel(kvm))
3352                         goto get_irqchip_out;
3353     &