target-i386/kvm.c

   1 /*
   2  * QEMU KVM support
   3  *
   4  * Copyright (C) 2006-2008 Qumranet Technologies
   5  * Copyright IBM, Corp. 2008
   6  *
   7  * Authors:
   8  *  Anthony Liguori   <aliguori@us.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include <sys/types.h>
  16 #include <sys/ioctl.h>
  17 #include <sys/mman.h>
  18 #include <sys/utsname.h>
  19
  20 #include <linux/kvm.h>
  21 #include <linux/kvm_para.h>
  22
  23 #include "qemu-common.h"
  24 #include "sysemu.h"
  25 #include "kvm.h"
  26 #include "cpu.h"
  27 #include "gdbstub.h"
  28 #include "host-utils.h"
  29 #include "hw/pc.h"
  30 #include "hw/apic.h"
  31 #include "ioport.h"
  32 #include "hyperv.h"
  33
  34 //#define DEBUG_KVM
  35
  36 #ifdef DEBUG_KVM
  37 #define DPRINTF(fmt, ...) \
  38     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  39 #else
  40 #define DPRINTF(fmt, ...) \
  41     do { } while (0)
  42 #endif
  43
  44 #define MSR_KVM_WALL_CLOCK  0x11
  45 #define MSR_KVM_SYSTEM_TIME 0x12
  46
  47 #ifndef BUS_MCEERR_AR
  48 #define BUS_MCEERR_AR 4
  49 #endif
  50 #ifndef BUS_MCEERR_AO
  51 #define BUS_MCEERR_AO 5
  52 #endif
  53
  54 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
  55     KVM_CAP_INFO(SET_TSS_ADDR),
  56     KVM_CAP_INFO(EXT_CPUID),
  57     KVM_CAP_INFO(MP_STATE),
  58     KVM_CAP_LAST_INFO
  59 };
  60
  61 static bool has_msr_star;
  62 static bool has_msr_hsave_pa;
  63 static bool has_msr_tsc_deadline;
  64 static bool has_msr_async_pf_en;
  65 static bool has_msr_misc_enable;
  66 static int lm_capable_kernel;
  67
  68 static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
  69 {
  70     struct kvm_cpuid2 *cpuid;
  71     int r, size;
  72
  73     size = sizeof(*cpuid) + max * sizeof(*cpuid->entries);
  74     cpuid = (struct kvm_cpuid2 *)g_malloc0(size);
  75     cpuid->nent = max;
  76     r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid);
  77     if (r == 0 && cpuid->nent >= max) {
  78         r = -E2BIG;
  79     }
  80     if (r < 0) {
  81         if (r == -E2BIG) {
  82             g_free(cpuid);
  83             return NULL;
  84         } else {
  85             fprintf(stderr, "KVM_GET_SUPPORTED_CPUID failed: %s\n",
  86                     strerror(-r));
  87             exit(1);
  88         }
  89     }
  90     return cpuid;
  91 }
  92
  93 struct kvm_para_features {
  94     int cap;
  95     int feature;
  96 } para_features[] = {
  97     { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE },
  98     { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
  99     { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
 100     { KVM_CAP_ASYNC_PF, KVM_FEATURE_ASYNC_PF },
 101     { -1, -1 }
 102 };
 103
 104 static int get_para_features(KVMState *s)
 105 {
 106     int i, features = 0;
 107
 108     for (i = 0; i < ARRAY_SIZE(para_features) - 1; i++) {
 109         if (kvm_check_extension(s, para_features[i].cap)) {
 110             features |= (1 << para_features[i].feature);
 111         }
 112     }
 113
 114     return features;
 115 }
 116
 117
 118 uint32_t kvm_arch_get_supported_cpuid(KVMState *s, uint32_t function,
 119                                       uint32_t index, int reg)
 120 {
 121     struct kvm_cpuid2 *cpuid;
 122     int i, max;
 123     uint32_t ret = 0;
 124     uint32_t cpuid_1_edx;
 125     int has_kvm_features = 0;
 126
 127     max = 1;
 128     while ((cpuid = try_get_cpuid(s, max)) == NULL) {
 129         max *= 2;
 130     }
 131
 132     for (i = 0; i < cpuid->nent; ++i) {
 133         if (cpuid->entries[i].function == function &&
 134             cpuid->entries[i].index == index) {
 135             if (cpuid->entries[i].function == KVM_CPUID_FEATURES) {
 136                 has_kvm_features = 1;
 137             }
 138             switch (reg) {
 139             case R_EAX:
 140                 ret = cpuid->entries[i].eax;
 141                 break;
 142             case R_EBX:
 143                 ret = cpuid->entries[i].ebx;
 144                 break;
 145             case R_ECX:
 146                 ret = cpuid->entries[i].ecx;
 147                 break;
 148             case R_EDX:
 149                 ret = cpuid->entries[i].edx;
 150                 switch (function) {
 151                 case 1:
 152                     /* KVM before 2.6.30 misreports the following features */
 153                     ret |= CPUID_MTRR | CPUID_PAT | CPUID_MCE | CPUID_MCA;
 154                     break;
 155                 case 0x80000001:
 156                     /* On Intel, kvm returns cpuid according to the Intel spec,
 157                      * so add missing bits according to the AMD spec:
 158                      */
 159                     cpuid_1_edx = kvm_arch_get_supported_cpuid(s, 1, 0, R_EDX);
 160                     ret |= cpuid_1_edx & 0x183f7ff;
 161                     break;
 162                 }
 163                 break;
 164             }
 165         }
 166     }
 167
 168     g_free(cpuid);
 169
 170     /* fallback for older kernels */
 171     if (!has_kvm_features && (function == KVM_CPUID_FEATURES)) {
 172         ret = get_para_features(s);
 173     }
 174
 175     return ret;
 176 }
 177
 178 typedef struct HWPoisonPage {
 179     ram_addr_t ram_addr;
 180     QLIST_ENTRY(HWPoisonPage) list;
 181 } HWPoisonPage;
 182
 183 static QLIST_HEAD(, HWPoisonPage) hwpoison_page_list =
 184     QLIST_HEAD_INITIALIZER(hwpoison_page_list);
 185
 186 static void kvm_unpoison_all(void *param)
 187 {
 188     HWPoisonPage *page, *next_page;
 189
 190     QLIST_FOREACH_SAFE(page, &hwpoison_page_list, list, next_page) {
 191         QLIST_REMOVE(page, list);
 192         qemu_ram_remap(page->ram_addr, TARGET_PAGE_SIZE);
 193         g_free(page);
 194     }
 195 }
 196
 197 static void kvm_hwpoison_page_add(ram_addr_t ram_addr)
 198 {
 199     HWPoisonPage *page;
 200
 201     QLIST_FOREACH(page, &hwpoison_page_list, list) {
 202         if (page->ram_addr == ram_addr) {
 203             return;
 204         }
 205     }
 206     page = g_malloc(sizeof(HWPoisonPage));
 207     page->ram_addr = ram_addr;
 208     QLIST_INSERT_HEAD(&hwpoison_page_list, page, list);
 209 }
 210
 211 static int kvm_get_mce_cap_supported(KVMState *s, uint64_t *mce_cap,
 212                                      int *max_banks)
 213 {
 214     int r;
 215
 216     r = kvm_check_extension(s, KVM_CAP_MCE);
 217     if (r > 0) {
 218         *max_banks = r;
 219         return kvm_ioctl(s, KVM_X86_GET_MCE_CAP_SUPPORTED, mce_cap);
 220     }
 221     return -ENOSYS;
 222 }
 223
 224 static void kvm_mce_inject(CPUState *env, target_phys_addr_t paddr, int code)
 225 {
 226     uint64_t status = MCI_STATUS_VAL | MCI_STATUS_UC | MCI_STATUS_EN |
 227                       MCI_STATUS_MISCV | MCI_STATUS_ADDRV | MCI_STATUS_S;
 228     uint64_t mcg_status = MCG_STATUS_MCIP;
 229
 230     if (code == BUS_MCEERR_AR) {
 231         status |= MCI_STATUS_AR | 0x134;
 232         mcg_status |= MCG_STATUS_EIPV;
 233     } else {
 234         status |= 0xc0;
 235         mcg_status |= MCG_STATUS_RIPV;
 236     }
 237     cpu_x86_inject_mce(NULL, env, 9, status, mcg_status, paddr,
 238                        (MCM_ADDR_PHYS << 6) | 0xc,
 239                        cpu_x86_support_mca_broadcast(env) ?
 240                        MCE_INJECT_BROADCAST : 0);
 241 }
 242
 243 static void hardware_memory_error(void)
 244 {
 245     fprintf(stderr, "Hardware memory error!\n");
 246     exit(1);
 247 }
 248
 249 int kvm_arch_on_sigbus_vcpu(CPUState *env, int code, void *addr)
 250 {
 251     ram_addr_t ram_addr;
 252     target_phys_addr_t paddr;
 253
 254     if ((env->mcg_cap & MCG_SER_P) && addr
 255         && (code == BUS_MCEERR_AR || code == BUS_MCEERR_AO)) {
 256         if (qemu_ram_addr_from_host(addr, &ram_addr) ||
 257             !kvm_physical_memory_addr_from_host(env->kvm_state, addr, &paddr)) {
 258             fprintf(stderr, "Hardware memory error for memory used by "
 259                     "QEMU itself instead of guest system!\n");
 260             /* Hope we are lucky for AO MCE */
 261             if (code == BUS_MCEERR_AO) {
 262                 return 0;
 263             } else {
 264                 hardware_memory_error();
 265             }
 266         }
 267         kvm_hwpoison_page_add(ram_addr);
 268         kvm_mce_inject(env, paddr, code);
 269     } else {
 270         if (code == BUS_MCEERR_AO) {
 271             return 0;
 272         } else if (code == BUS_MCEERR_AR) {
 273             hardware_memory_error();
 274         } else {
 275             return 1;
 276         }
 277     }
 278     return 0;
 279 }
 280
 281 int kvm_arch_on_sigbus(int code, void *addr)
 282 {
 283     if ((first_cpu->mcg_cap & MCG_SER_P) && addr && code == BUS_MCEERR_AO) {
 284         ram_addr_t ram_addr;
 285         target_phys_addr_t paddr;
 286
 287         /* Hope we are lucky for AO MCE */
 288         if (qemu_ram_addr_from_host(addr, &ram_addr) ||
 289             !kvm_physical_memory_addr_from_host(first_cpu->kvm_state, addr,
 290                                                 &paddr)) {
 291             fprintf(stderr, "Hardware memory error for memory used by "
 292                     "QEMU itself instead of guest system!: %p\n", addr);
 293             return 0;
 294         }
 295         kvm_hwpoison_page_add(ram_addr);
 296         kvm_mce_inject(first_cpu, paddr, code);
 297     } else {
 298         if (code == BUS_MCEERR_AO) {
 299             return 0;
 300         } else if (code == BUS_MCEERR_AR) {
 301             hardware_memory_error();
 302         } else {
 303             return 1;
 304         }
 305     }
 306     return 0;
 307 }
 308
 309 static int kvm_inject_mce_oldstyle(CPUState *env)
 310 {
 311     if (!kvm_has_vcpu_events() && env->exception_injected == EXCP12_MCHK) {
 312         unsigned int bank, bank_num = env->mcg_cap & 0xff;
 313         struct kvm_x86_mce mce;
 314
 315         env->exception_injected = -1;
 316
 317         /*
 318          * There must be at least one bank in use if an MCE is pending.
 319          * Find it and use its values for the event injection.
 320          */
 321         for (bank = 0; bank < bank_num; bank++) {
 322             if (env->mce_banks[bank * 4 + 1] & MCI_STATUS_VAL) {
 323                 break;
 324             }
 325         }
 326         assert(bank < bank_num);
 327
 328         mce.bank = bank;
 329         mce.status = env->mce_banks[bank * 4 + 1];
 330         mce.mcg_status = env->mcg_status;
 331         mce.addr = env->mce_banks[bank * 4 + 2];
 332         mce.misc = env->mce_banks[bank * 4 + 3];
 333
 334         return kvm_vcpu_ioctl(env, KVM_X86_SET_MCE, &mce);
 335     }
 336     return 0;
 337 }
 338
 339 static void cpu_update_state(void *opaque, int running, RunState state)
 340 {
 341     CPUState *env = opaque;
 342
 343     if (running) {
 344         env->tsc_valid = false;
 345     }
 346 }
 347
 348 int kvm_arch_init_vcpu(CPUState *env)
 349 {
 350     struct {
 351         struct kvm_cpuid2 cpuid;
 352         struct kvm_cpuid_entry2 entries[100];
 353     } QEMU_PACKED cpuid_data;
 354     KVMState *s = env->kvm_state;
 355     uint32_t limit, i, j, cpuid_i;
 356     uint32_t unused;
 357     struct kvm_cpuid_entry2 *c;
 358     uint32_t signature[3];
 359     int r;
 360
 361     env->cpuid_features &= kvm_arch_get_supported_cpuid(s, 1, 0, R_EDX);
 362
 363     i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR;
 364     env->cpuid_ext_features &= kvm_arch_get_supported_cpuid(s, 1, 0, R_ECX);
 365     env->cpuid_ext_features |= i;
 366
 367     env->cpuid_ext2_features &= kvm_arch_get_supported_cpuid(s, 0x80000001,
 368                                                              0, R_EDX);
 369     env->cpuid_ext3_features &= kvm_arch_get_supported_cpuid(s, 0x80000001,
 370                                                              0, R_ECX);
 371     env->cpuid_svm_features  &= kvm_arch_get_supported_cpuid(s, 0x8000000A,
 372                                                              0, R_EDX);
 373
 374     cpuid_i = 0;
 375
 376     /* Paravirtualization CPUIDs */
 377     c = &cpuid_data.entries[cpuid_i++];
 378     memset(c, 0, sizeof(*c));
 379     c->function = KVM_CPUID_SIGNATURE;
 380     if (!hyperv_enabled()) {
 381         memcpy(signature, "KVMKVMKVM\0\0\0", 12);
 382         c->eax = 0;
 383     } else {
 384         memcpy(signature, "Microsoft Hv", 12);
 385         c->eax = HYPERV_CPUID_MIN;
 386     }
 387     c->ebx = signature[0];
 388     c->ecx = signature[1];
 389     c->edx = signature[2];
 390
 391     c = &cpuid_data.entries[cpuid_i++];
 392     memset(c, 0, sizeof(*c));
 393     c->function = KVM_CPUID_FEATURES;
 394     c->eax = env->cpuid_kvm_features &
 395         kvm_arch_get_supported_cpuid(s, KVM_CPUID_FEATURES, 0, R_EAX);
 396
 397     if (hyperv_enabled()) {
 398         memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12);
 399         c->eax = signature[0];
 400
 401         c = &cpuid_data.entries[cpuid_i++];
 402         memset(c, 0, sizeof(*c));
 403         c->function = HYPERV_CPUID_VERSION;
 404         c->eax = 0x00001bbc;
 405         c->ebx = 0x00060001;
 406
 407         c = &cpuid_data.entries[cpuid_i++];
 408         memset(c, 0, sizeof(*c));
 409         c->function = HYPERV_CPUID_FEATURES;
 410         if (hyperv_relaxed_timing_enabled()) {
 411             c->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
 412         }
 413         if (hyperv_vapic_recommended()) {
 414             c->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
 415             c->eax |= HV_X64_MSR_APIC_ACCESS_AVAILABLE;
 416         }
 417
 418         c = &cpuid_data.entries[cpuid_i++];
 419         memset(c, 0, sizeof(*c));
 420         c->function = HYPERV_CPUID_ENLIGHTMENT_INFO;
 421         if (hyperv_relaxed_timing_enabled()) {
 422             c->eax |= HV_X64_RELAXED_TIMING_RECOMMENDED;
 423         }
 424         if (hyperv_vapic_recommended()) {
 425             c->eax |= HV_X64_APIC_ACCESS_RECOMMENDED;
 426         }
 427         c->ebx = hyperv_get_spinlock_retries();
 428
 429         c = &cpuid_data.entries[cpuid_i++];
 430         memset(c, 0, sizeof(*c));
 431         c->function = HYPERV_CPUID_IMPLEMENT_LIMITS;
 432         c->eax = 0x40;
 433         c->ebx = 0x40;
 434
 435         c = &cpuid_data.entries[cpuid_i++];
 436         memset(c, 0, sizeof(*c));
 437         c->function = KVM_CPUID_SIGNATURE_NEXT;
 438         memcpy(signature, "KVMKVMKVM\0\0\0", 12);
 439         c->eax = 0;
 440         c->ebx = signature[0];
 441         c->ecx = signature[1];
 442         c->edx = signature[2];
 443     }
 444
 445     has_msr_async_pf_en = c->eax & (1 << KVM_FEATURE_ASYNC_PF);
 446
 447     cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);
 448
 449     for (i = 0; i <= limit; i++) {
 450         c = &cpuid_data.entries[cpuid_i++];
 451
 452         switch (i) {
 453         case 2: {
 454             /* Keep reading function 2 till all the input is received */
 455             int times;
 456
 457             c->function = i;
 458             c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC |
 459                        KVM_CPUID_FLAG_STATE_READ_NEXT;
 460             cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 461             times = c->eax & 0xff;
 462
 463             for (j = 1; j < times; ++j) {
 464                 c = &cpuid_data.entries[cpuid_i++];
 465                 c->function = i;
 466                 c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC;
 467                 cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 468             }
 469             break;
 470         }
 471         case 4:
 472         case 0xb:
 473         case 0xd:
 474             for (j = 0; ; j++) {
 475                 if (i == 0xd && j == 64) {
 476                     break;
 477                 }
 478                 c->function = i;
 479                 c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
 480                 c->index = j;
 481                 cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->edx);
 482
 483                 if (i == 4 && c->eax == 0) {
 484                     break;
 485                 }
 486                 if (i == 0xb && !(c->ecx & 0xff00)) {
 487                     break;
 488                 }
 489                 if (i == 0xd && c->eax == 0) {
 490                     continue;
 491                 }
 492                 c = &cpuid_data.entries[cpuid_i++];
 493             }
 494             break;
 495         default:
 496             c->function = i;
 497             c->flags = 0;
 498             cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 499             break;
 500         }
 501     }
 502     cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused);
 503
 504     for (i = 0x80000000; i <= limit; i++) {
 505         c = &cpuid_data.entries[cpuid_i++];
 506
 507         c->function = i;
 508         c->flags = 0;
 509         cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 510     }
 511
 512     /* Call Centaur's CPUID instructions they are supported. */
 513     if (env->cpuid_xlevel2 > 0) {
 514         env->cpuid_ext4_features &=
 515             kvm_arch_get_supported_cpuid(s, 0xC0000001, 0, R_EDX);
 516         cpu_x86_cpuid(env, 0xC0000000, 0, &limit, &unused, &unused, &unused);
 517
 518         for (i = 0xC0000000; i <= limit; i++) {
 519             c = &cpuid_data.entries[cpuid_i++];
 520
 521             c->function = i;
 522             c->flags = 0;
 523             cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 524         }
 525     }
 526
 527     cpuid_data.cpuid.nent = cpuid_i;
 528
 529     if (((env->cpuid_version >> 8)&0xF) >= 6
 530         && (env->cpuid_features&(CPUID_MCE|CPUID_MCA)) == (CPUID_MCE|CPUID_MCA)
 531         && kvm_check_extension(env->kvm_state, KVM_CAP_MCE) > 0) {
 532         uint64_t mcg_cap;
 533         int banks;
 534         int ret;
 535
 536         ret = kvm_get_mce_cap_supported(env->kvm_state, &mcg_cap, &banks);
 537         if (ret < 0) {
 538             fprintf(stderr, "kvm_get_mce_cap_supported: %s", strerror(-ret));
 539             return ret;
 540         }
 541
 542         if (banks > MCE_BANKS_DEF) {
 543             banks = MCE_BANKS_DEF;
 544         }
 545         mcg_cap &= MCE_CAP_DEF;
 546         mcg_cap |= banks;
 547         ret = kvm_vcpu_ioctl(env, KVM_X86_SETUP_MCE, &mcg_cap);
 548         if (ret < 0) {
 549             fprintf(stderr, "KVM_X86_SETUP_MCE: %s", strerror(-ret));
 550             return ret;
 551         }
 552
 553         env->mcg_cap = mcg_cap;
 554     }
 555
 556     qemu_add_vm_change_state_handler(cpu_update_state, env);
 557
 558     r = kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data);
 559     if (r) {
 560         return r;
 561     }
 562
 563     r = kvm_check_extension(env->kvm_state, KVM_CAP_TSC_CONTROL);
 564     if (r && env->tsc_khz) {
 565         r = kvm_vcpu_ioctl(env, KVM_SET_TSC_KHZ, env->tsc_khz);
 566         if (r < 0) {
 567             fprintf(stderr, "KVM_SET_TSC_KHZ failed\n");
 568             return r;
 569         }
 570     }
 571
 572     if (kvm_has_xsave()) {
 573         env->kvm_xsave_buf = qemu_memalign(4096, sizeof(struct kvm_xsave));
 574     }
 575
 576     return 0;
 577 }
 578
 579 void kvm_arch_reset_vcpu(CPUState *env)
 580 {
 581     env->exception_injected = -1;
 582     env->interrupt_injected = -1;
 583     env->xcr0 = 1;
 584     if (kvm_irqchip_in_kernel()) {
 585         env->mp_state = cpu_is_bsp(env) ? KVM_MP_STATE_RUNNABLE :
 586                                           KVM_MP_STATE_UNINITIALIZED;
 587     } else {
 588         env->mp_state = KVM_MP_STATE_RUNNABLE;
 589     }
 590 }
 591
 592 static int kvm_get_supported_msrs(KVMState *s)
 593 {
 594     static int kvm_supported_msrs;
 595     int ret = 0;
 596
 597     /* first time */
 598     if (kvm_supported_msrs == 0) {
 599         struct kvm_msr_list msr_list, *kvm_msr_list;
 600
 601         kvm_supported_msrs = -1;
 602
 603         /* Obtain MSR list from KVM.  These are the MSRs that we must
 604          * save/restore */
 605         msr_list.nmsrs = 0;
 606         ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, &msr_list);
 607         if (ret < 0 && ret != -E2BIG) {
 608             return ret;
 609         }
 610         /* Old kernel modules had a bug and could write beyond the provided
 611            memory. Allocate at least a safe amount of 1K. */
 612         kvm_msr_list = g_malloc0(MAX(1024, sizeof(msr_list) +
 613                                               msr_list.nmsrs *
 614                                               sizeof(msr_list.indices[0])));
 615
 616         kvm_msr_list->nmsrs = msr_list.nmsrs;
 617         ret = kvm_ioctl(s, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
 618         if (ret >= 0) {
 619             int i;
 620
 621             for (i = 0; i < kvm_msr_list->nmsrs; i++) {
 622                 if (kvm_msr_list->indices[i] == MSR_STAR) {
 623                     has_msr_star = true;
 624                     continue;
 625                 }
 626                 if (kvm_msr_list->indices[i] == MSR_VM_HSAVE_PA) {
 627                     has_msr_hsave_pa = true;
 628                     continue;
 629                 }
 630                 if (kvm_msr_list->indices[i] == MSR_IA32_TSCDEADLINE) {
 631                     has_msr_tsc_deadline = true;
 632                     continue;
 633                 }
 634                 if (kvm_msr_list->indices[i] == MSR_IA32_MISC_ENABLE) {
 635                     has_msr_misc_enable = true;
 636                     continue;
 637                 }
 638             }
 639         }
 640
 641         g_free(kvm_msr_list);
 642     }
 643
 644     return ret;
 645 }
 646
 647 int kvm_arch_init(KVMState *s)
 648 {
 649     QemuOptsList *list = qemu_find_opts("machine");
 650     uint64_t identity_base = 0xfffbc000;
 651     uint64_t shadow_mem;
 652     int ret;
 653     struct utsname utsname;
 654
 655     ret = kvm_get_supported_msrs(s);
 656     if (ret < 0) {
 657         return ret;
 658     }
 659
 660     uname(&utsname);
 661     lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
 662
 663     /*
 664      * On older Intel CPUs, KVM uses vm86 mode to emulate 16-bit code directly.
 665      * In order to use vm86 mode, an EPT identity map and a TSS  are needed.
 666      * Since these must be part of guest physical memory, we need to allocate
 667      * them, both by setting their start addresses in the kernel and by
 668      * creating a corresponding e820 entry. We need 4 pages before the BIOS.
 669      *
 670      * Older KVM versions may not support setting the identity map base. In
 671      * that case we need to stick with the default, i.e. a 256K maximum BIOS
 672      * size.
 673      */
 674     if (kvm_check_extension(s, KVM_CAP_SET_IDENTITY_MAP_ADDR)) {
 675         /* Allows up to 16M BIOSes. */
 676         identity_base = 0xfeffc000;
 677
 678         ret = kvm_vm_ioctl(s, KVM_SET_IDENTITY_MAP_ADDR, &identity_base);
 679         if (ret < 0) {
 680             return ret;
 681         }
 682     }
 683
 684     /* Set TSS base one page after EPT identity map. */
 685     ret = kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, identity_base + 0x1000);
 686     if (ret < 0) {
 687         return ret;
 688     }
 689
 690     /* Tell fw_cfg to notify the BIOS to reserve the range. */
 691     ret = e820_add_entry(identity_base, 0x4000, E820_RESERVED);
 692     if (ret < 0) {
 693         fprintf(stderr, "e820_add_entry() table is full\n");
 694         return ret;
 695     }
 696     qemu_register_reset(kvm_unpoison_all, NULL);
 697
 698     if (!QTAILQ_EMPTY(&list->head)) {
 699         shadow_mem = qemu_opt_get_size(QTAILQ_FIRST(&list->head),
 700                                        "kvm_shadow_mem", -1);
 701         if (shadow_mem != -1) {
 702             shadow_mem /= 4096;
 703             ret = kvm_vm_ioctl(s, KVM_SET_NR_MMU_PAGES, shadow_mem);
 704             if (ret < 0) {
 705                 return ret;
 706             }
 707         }
 708     }
 709     return 0;
 710 }
 711
 712 static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 713 {
 714     lhs->selector = rhs->selector;
 715     lhs->base = rhs->base;
 716     lhs->limit = rhs->limit;
 717     lhs->type = 3;
 718     lhs->present = 1;
 719     lhs->dpl = 3;
 720     lhs->db = 0;
 721     lhs->s = 1;
 722     lhs->l = 0;
 723     lhs->g = 0;
 724     lhs->avl = 0;
 725     lhs->unusable = 0;
 726 }
 727
 728 static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 729 {
 730     unsigned flags = rhs->flags;
 731     lhs->selector = rhs->selector;
 732     lhs->base = rhs->base;
 733     lhs->limit = rhs->limit;
 734     lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
 735     lhs->present = (flags & DESC_P_MASK) != 0;
 736     lhs->dpl = (flags >> DESC_DPL_SHIFT) & 3;
 737     lhs->db = (flags >> DESC_B_SHIFT) & 1;
 738     lhs->s = (flags & DESC_S_MASK) != 0;
 739     lhs->l = (flags >> DESC_L_SHIFT) & 1;
 740     lhs->g = (flags & DESC_G_MASK) != 0;
 741     lhs->avl = (flags & DESC_AVL_MASK) != 0;
 742     lhs->unusable = 0;
 743 }
 744
 745 static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
 746 {
 747     lhs->selector = rhs->selector;
 748     lhs->base = rhs->base;
 749     lhs->limit = rhs->limit;
 750     lhs->flags = (rhs->type << DESC_TYPE_SHIFT) |
 751                  (rhs->present * DESC_P_MASK) |
 752                  (rhs->dpl << DESC_DPL_SHIFT) |
 753                  (rhs->db << DESC_B_SHIFT) |
 754                  (rhs->s * DESC_S_MASK) |
 755                  (rhs->l << DESC_L_SHIFT) |
 756                  (rhs->g * DESC_G_MASK) |
 757                  (rhs->avl * DESC_AVL_MASK);
 758 }
 759
 760 static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set)
 761 {
 762     if (set) {
 763         *kvm_reg = *qemu_reg;
 764     } else {
 765         *qemu_reg = *kvm_reg;
 766     }
 767 }
 768
 769 static int kvm_getput_regs(CPUState *env, int set)
 770 {
 771     struct kvm_regs regs;
 772     int ret = 0;
 773
 774     if (!set) {
 775         ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 776         if (ret < 0) {
 777             return ret;
 778         }
 779     }
 780
 781     kvm_getput_reg(&regs.rax, &env->regs[R_EAX], set);
 782     kvm_getput_reg(&regs.rbx, &env->regs[R_EBX], set);
 783     kvm_getput_reg(&regs.rcx, &env->regs[R_ECX], set);
 784     kvm_getput_reg(&regs.rdx, &env->regs[R_EDX], set);
 785     kvm_getput_reg(&regs.rsi, &env->regs[R_ESI], set);
 786     kvm_getput_reg(&regs.rdi, &env->regs[R_EDI], set);
 787     kvm_getput_reg(&regs.rsp, &env->regs[R_ESP], set);
 788     kvm_getput_reg(&regs.rbp, &env->regs[R_EBP], set);
 789 #ifdef TARGET_X86_64
 790     kvm_getput_reg(&regs.r8, &env->regs[8], set);
 791     kvm_getput_reg(&regs.r9, &env->regs[9], set);
 792     kvm_getput_reg(&regs.r10, &env->regs[10], set);
 793     kvm_getput_reg(&regs.r11, &env->regs[11], set);
 794     kvm_getput_reg(&regs.r12, &env->regs[12], set);
 795     kvm_getput_reg(&regs.r13, &env->regs[13], set);
 796     kvm_getput_reg(&regs.r14, &env->regs[14], set);
 797     kvm_getput_reg(&regs.r15, &env->regs[15], set);
 798 #endif
 799
 800     kvm_getput_reg(&regs.rflags, &env->eflags, set);
 801     kvm_getput_reg(&regs.rip, &env->eip, set);
 802
 803     if (set) {
 804         ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 805     }
 806
 807     return ret;
 808 }
 809
 810 static int kvm_put_fpu(CPUState *env)
 811 {
 812     struct kvm_fpu fpu;
 813     int i;
 814
 815     memset(&fpu, 0, sizeof fpu);
 816     fpu.fsw = env->fpus & ~(7 << 11);
 817     fpu.fsw |= (env->fpstt & 7) << 11;
 818     fpu.fcw = env->fpuc;
 819     fpu.last_opcode = env->fpop;
 820     fpu.last_ip = env->fpip;
 821     fpu.last_dp = env->fpdp;
 822     for (i = 0; i < 8; ++i) {
 823         fpu.ftwx |= (!env->fptags[i]) << i;
 824     }
 825     memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
 826     memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs);
 827     fpu.mxcsr = env->mxcsr;
 828
 829     return kvm_vcpu_ioctl(env, KVM_SET_FPU, &fpu);
 830 }
 831
 832 #define XSAVE_FCW_FSW     0
 833 #define XSAVE_FTW_FOP     1
 834 #define XSAVE_CWD_RIP     2
 835 #define XSAVE_CWD_RDP     4
 836 #define XSAVE_MXCSR       6
 837 #define XSAVE_ST_SPACE    8
 838 #define XSAVE_XMM_SPACE   40
 839 #define XSAVE_XSTATE_BV   128
 840 #define XSAVE_YMMH_SPACE  144
 841
 842 static int kvm_put_xsave(CPUState *env)
 843 {
 844     struct kvm_xsave* xsave = env->kvm_xsave_buf;
 845     uint16_t cwd, swd, twd;
 846     int i, r;
 847
 848     if (!kvm_has_xsave()) {
 849         return kvm_put_fpu(env);
 850     }
 851
 852     memset(xsave, 0, sizeof(struct kvm_xsave));
 853     twd = 0;
 854     swd = env->fpus & ~(7 << 11);
 855     swd |= (env->fpstt & 7) << 11;
 856     cwd = env->fpuc;
 857     for (i = 0; i < 8; ++i) {
 858         twd |= (!env->fptags[i]) << i;
 859     }
 860     xsave->region[XSAVE_FCW_FSW] = (uint32_t)(swd << 16) + cwd;
 861     xsave->region[XSAVE_FTW_FOP] = (uint32_t)(env->fpop << 16) + twd;
 862     memcpy(&xsave->region[XSAVE_CWD_RIP], &env->fpip, sizeof(env->fpip));
 863     memcpy(&xsave->region[XSAVE_CWD_RDP], &env->fpdp, sizeof(env->fpdp));
 864     memcpy(&xsave->region[XSAVE_ST_SPACE], env->fpregs,
 865             sizeof env->fpregs);
 866     memcpy(&xsave->region[XSAVE_XMM_SPACE], env->xmm_regs,
 867             sizeof env->xmm_regs);
 868     xsave->region[XSAVE_MXCSR] = env->mxcsr;
 869     *(uint64_t *)&xsave->region[XSAVE_XSTATE_BV] = env->xstate_bv;
 870     memcpy(&xsave->region[XSAVE_YMMH_SPACE], env->ymmh_regs,
 871             sizeof env->ymmh_regs);
 872     r = kvm_vcpu_ioctl(env, KVM_SET_XSAVE, xsave);
 873     return r;
 874 }
 875
 876 static int kvm_put_xcrs(CPUState *env)
 877 {
 878     struct kvm_xcrs xcrs;
 879
 880     if (!kvm_has_xcrs()) {
 881         return 0;
 882     }
 883
 884     xcrs.nr_xcrs = 1;
 885     xcrs.flags = 0;
 886     xcrs.xcrs[0].xcr = 0;
 887     xcrs.xcrs[0].value = env->xcr0;
 888     return kvm_vcpu_ioctl(env, KVM_SET_XCRS, &xcrs);
 889 }
 890
 891 static int kvm_put_sregs(CPUState *env)
 892 {
 893     struct kvm_sregs sregs;
 894
 895     memset(sregs.interrupt_bitmap, 0, sizeof(sregs.interrupt_bitmap));
 896     if (env->interrupt_injected >= 0) {
 897         sregs.interrupt_bitmap[env->interrupt_injected / 64] |=
 898                 (uint64_t)1 << (env->interrupt_injected % 64);
 899     }
 900
 901     if ((env->eflags & VM_MASK)) {
 902         set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
 903         set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
 904         set_v8086_seg(&sregs.es, &env->segs[R_ES]);
 905         set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
 906         set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
 907         set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
 908     } else {
 909         set_seg(&sregs.cs, &env->segs[R_CS]);
 910         set_seg(&sregs.ds, &env->segs[R_DS]);
 911         set_seg(&sregs.es, &env->segs[R_ES]);
 912         set_seg(&sregs.fs, &env->segs[R_FS]);
 913         set_seg(&sregs.gs, &env->segs[R_GS]);
 914         set_seg(&sregs.ss, &env->segs[R_SS]);
 915     }
 916
 917     set_seg(&sregs.tr, &env->tr);
 918     set_seg(&sregs.ldt, &env->ldt);
 919
 920     sregs.idt.limit = env->idt.limit;
 921     sregs.idt.base = env->idt.base;
 922     sregs.gdt.limit = env->gdt.limit;
 923     sregs.gdt.base = env->gdt.base;
 924
 925     sregs.cr0 = env->cr[0];
 926     sregs.cr2 = env->cr[2];
 927     sregs.cr3 = env->cr[3];
 928     sregs.cr4 = env->cr[4];
 929
 930     sregs.cr8 = cpu_get_apic_tpr(env->apic_state);
 931     sregs.apic_base = cpu_get_apic_base(env->apic_state);
 932
 933     sregs.efer = env->efer;
 934
 935     return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
 936 }
 937
 938 static void kvm_msr_entry_set(struct kvm_msr_entry *entry,
 939                               uint32_t index, uint64_t value)
 940 {
 941     entry->index = index;
 942     entry->data = value;
 943 }
 944
 945 static int kvm_put_msrs(CPUState *env, int level)
 946 {
 947     struct {
 948         struct kvm_msrs info;
 949         struct kvm_msr_entry entries[100];
 950     } msr_data;
 951     struct kvm_msr_entry *msrs = msr_data.entries;
 952     int n = 0;
 953
 954     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
 955     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
 956     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
 957     kvm_msr_entry_set(&msrs[n++], MSR_PAT, env->pat);
 958     if (has_msr_star) {
 959         kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star);
 960     }
 961     if (has_msr_hsave_pa) {
 962         kvm_msr_entry_set(&msrs[n++], MSR_VM_HSAVE_PA, env->vm_hsave);
 963     }
 964     if (has_msr_tsc_deadline) {
 965         kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSCDEADLINE, env->tsc_deadline);
 966     }
 967     if (has_msr_misc_enable) {
 968         kvm_msr_entry_set(&msrs[n++], MSR_IA32_MISC_ENABLE,
 969                           env->msr_ia32_misc_enable);
 970     }
 971 #ifdef TARGET_X86_64
 972     if (lm_capable_kernel) {
 973         kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
 974         kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
 975         kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
 976         kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
 977     }
 978 #endif
 979     if (level == KVM_PUT_FULL_STATE) {
 980         /*
 981          * KVM is yet unable to synchronize TSC values of multiple VCPUs on
 982          * writeback. Until this is fixed, we only write the offset to SMP
 983          * guests after migration, desynchronizing the VCPUs, but avoiding
 984          * huge jump-backs that would occur without any writeback at all.
 985          */
 986         if (smp_cpus == 1 || env->tsc != 0) {
 987             kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
 988         }
 989     }
 990     /*
 991      * The following paravirtual MSRs have side effects on the guest or are
 992      * too heavy for normal writeback. Limit them to reset or full state
 993      * updates.
 994      */
 995     if (level >= KVM_PUT_RESET_STATE) {
 996         kvm_msr_entry_set(&msrs[n++], MSR_KVM_SYSTEM_TIME,
 997                           env->system_time_msr);
 998         kvm_msr_entry_set(&msrs[n++], MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
 999         if (has_msr_async_pf_en) {
1000             kvm_msr_entry_set(&msrs[n++], MSR_KVM_ASYNC_PF_EN,
1001                               env->async_pf_en_msr);
1002         }
1003         if (hyperv_hypercall_available()) {
1004             kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_GUEST_OS_ID, 0);
1005             kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_HYPERCALL, 0);
1006         }
1007         if (hyperv_vapic_recommended()) {
1008             kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_APIC_ASSIST_PAGE, 0);
1009         }
1010     }
1011     if (env->mcg_cap) {
1012         int i;
1013
1014         kvm_msr_entry_set(&msrs[n++], MSR_MCG_STATUS, env->mcg_status);
1015         kvm_msr_entry_set(&msrs[n++], MSR_MCG_CTL, env->mcg_ctl);
1016         for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
1017             kvm_msr_entry_set(&msrs[n++], MSR_MC0_CTL + i, env->mce_banks[i]);
1018         }
1019     }
1020
1021     msr_data.info.nmsrs = n;
1022
1023     return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data);
1024
1025 }
1026
1027
1028 static int kvm_get_fpu(CPUState *env)
1029 {
1030     struct kvm_fpu fpu;
1031     int i, ret;
1032
1033     ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu);
1034     if (ret < 0) {
1035         return ret;
1036     }
1037
1038     env->fpstt = (fpu.fsw >> 11) & 7;
1039     env->fpus = fpu.fsw;
1040     env->fpuc = fpu.fcw;
1041     env->fpop = fpu.last_opcode;
1042     env->fpip = fpu.last_ip;
1043     env->fpdp = fpu.last_dp;
1044     for (i = 0; i < 8; ++i) {
1045         env->fptags[i] = !((fpu.ftwx >> i) & 1);
1046     }
1047     memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
1048     memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
1049     env->mxcsr = fpu.mxcsr;
1050
1051     return 0;
1052 }
1053
1054 static int kvm_get_xsave(CPUState *env)
1055 {
1056     struct kvm_xsave* xsave = env->kvm_xsave_buf;
1057     int ret, i;
1058     uint16_t cwd, swd, twd;
1059
1060     if (!kvm_has_xsave()) {
1061         return kvm_get_fpu(env);
1062     }
1063
1064     ret = kvm_vcpu_ioctl(env, KVM_GET_XSAVE, xsave);
1065     if (ret < 0) {
1066         return ret;
1067     }
1068
1069     cwd = (uint16_t)xsave->region[XSAVE_FCW_FSW];
1070     swd = (uint16_t)(xsave->region[XSAVE_FCW_FSW] >> 16);
1071     twd = (uint16_t)xsave->region[XSAVE_FTW_FOP];
1072     env->fpop = (uint16_t)(xsave->region[XSAVE_FTW_FOP] >> 16);
1073     env->fpstt = (swd >> 11) & 7;
1074     env->fpus = swd;
1075     env->fpuc = cwd;
1076     for (i = 0; i < 8; ++i) {
1077         env->fptags[i] = !((twd >> i) & 1);
1078     }
1079     memcpy(&env->fpip, &xsave->region[XSAVE_CWD_RIP], sizeof(env->fpip));
1080     memcpy(&env->fpdp, &xsave->region[XSAVE_CWD_RDP], sizeof(env->fpdp));
1081     env->mxcsr = xsave->region[XSAVE_MXCSR];
1082     memcpy(env->fpregs, &xsave->region[XSAVE_ST_SPACE],
1083             sizeof env->fpregs);
1084     memcpy(env->xmm_regs, &xsave->region[XSAVE_XMM_SPACE],
1085             sizeof env->xmm_regs);
1086     env->xstate_bv = *(uint64_t *)&xsave->region[XSAVE_XSTATE_BV];
1087     memcpy(env->ymmh_regs, &xsave->region[XSAVE_YMMH_SPACE],
1088             sizeof env->ymmh_regs);
1089     return 0;
1090 }
1091
1092 static int kvm_get_xcrs(CPUState *env)
1093 {
1094     int i, ret;
1095     struct kvm_xcrs xcrs;
1096
1097     if (!kvm_has_xcrs()) {
1098         return 0;
1099     }
1100
1101     ret = kvm_vcpu_ioctl(env, KVM_GET_XCRS, &xcrs);
1102     if (ret < 0) {
1103         return ret;
1104     }
1105
1106     for (i = 0; i < xcrs.nr_xcrs; i++) {
1107         /* Only support xcr0 now */
1108         if (xcrs.xcrs[0].xcr == 0) {
1109             env->xcr0 = xcrs.xcrs[0].value;
1110             break;
1111         }
1112     }
1113     return 0;
1114 }
1115
1116 static int kvm_get_sregs(CPUState *env)
1117 {
1118     struct kvm_sregs sregs;
1119     uint32_t hflags;
1120     int bit, i, ret;
1121
1122     ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
1123     if (ret < 0) {
1124         return ret;
1125     }
1126
1127     /* There can only be one pending IRQ set in the bitmap at a time, so try
1128        to find it and save its number instead (-1 for none). */
1129     env->interrupt_injected = -1;
1130     for (i = 0; i < ARRAY_SIZE(sregs.interrupt_bitmap); i++) {
1131         if (sregs.interrupt_bitmap[i]) {
1132             bit = ctz64(sregs.interrupt_bitmap[i]);
1133             env->interrupt_injected = i * 64 + bit;
1134             break;
1135         }
1136     }
1137
1138     get_seg(&env->segs[R_CS], &sregs.cs);
1139     get_seg(&env->segs[R_DS], &sregs.ds);
1140     get_seg(&env->segs[R_ES], &sregs.es);
1141     get_seg(&env->segs[R_FS], &sregs.fs);
1142     get_seg(&env->segs[R_GS], &sregs.gs);
1143     get_seg(&env->segs[R_SS], &sregs.ss);
1144
1145     get_seg(&env->tr, &sregs.tr);
1146     get_seg(&env->ldt, &sregs.ldt);
1147
1148     env->idt.limit = sregs.idt.limit;
1149     env->idt.base = sregs.idt.base;
1150     env->gdt.limit = sregs.gdt.limit;
1151     env->gdt.base = sregs.gdt.base;
1152
1153     env->cr[0] = sregs.cr0;
1154     env->cr[2] = sregs.cr2;
1155     env->cr[3] = sregs.cr3;
1156     env->cr[4] = sregs.cr4;
1157
1158     env->efer = sregs.efer;
1159
1160     /* changes to apic base and cr8/tpr are read back via kvm_arch_post_run */
1161
1162 #define HFLAG_COPY_MASK \
1163     ~( HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
1164        HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
1165        HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
1166        HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
1167
1168     hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
1169     hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
1170     hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
1171                 (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
1172     hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
1173     hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
1174                 (HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
1175
1176     if (env->efer & MSR_EFER_LMA) {
1177         hflags |= HF_LMA_MASK;
1178     }
1179
1180     if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
1181         hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
1182     } else {
1183         hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
1184                     (DESC_B_SHIFT - HF_CS32_SHIFT);
1185         hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
1186                     (DESC_B_SHIFT - HF_SS32_SHIFT);
1187         if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK) ||
1188             !(hflags & HF_CS32_MASK)) {
1189             hflags |= HF_ADDSEG_MASK;
1190         } else {
1191             hflags |= ((env->segs[R_DS].base | env->segs[R_ES].base |
1192                         env->segs[R_SS].base) != 0) << HF_ADDSEG_SHIFT;
1193         }
1194     }
1195     env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
1196
1197     return 0;
1198 }
1199
1200 static int kvm_get_msrs(CPUState *env)
1201 {
1202     struct {
1203         struct kvm_msrs info;
1204         struct kvm_msr_entry entries[100];
1205     } msr_data;
1206     struct kvm_msr_entry *msrs = msr_data.entries;
1207     int ret, i, n;
1208
1209     n = 0;
1210     msrs[n++].index = MSR_IA32_SYSENTER_CS;
1211     msrs[n++].index = MSR_IA32_SYSENTER_ESP;
1212     msrs[n++].index = MSR_IA32_SYSENTER_EIP;
1213     msrs[n++].index = MSR_PAT;
1214     if (has_msr_star) {
1215         msrs[n++].index = MSR_STAR;
1216     }
1217     if (has_msr_hsave_pa) {
1218         msrs[n++].index = MSR_VM_HSAVE_PA;
1219     }
1220     if (has_msr_tsc_deadline) {
1221         msrs[n++].index = MSR_IA32_TSCDEADLINE;
1222     }
1223     if (has_msr_misc_enable) {
1224         msrs[n++].index = MSR_IA32_MISC_ENABLE;
1225     }
1226
1227     if (!env->tsc_valid) {
1228         msrs[n++].index = MSR_IA32_TSC;
1229         env->tsc_valid = !runstate_is_running();
1230     }
1231
1232 #ifdef TARGET_X86_64
1233     if (lm_capable_kernel) {
1234         msrs[n++].index = MSR_CSTAR;
1235         msrs[n++].index = MSR_KERNELGSBASE;
1236         msrs[n++].index = MSR_FMASK;
1237         msrs[n++].index = MSR_LSTAR;
1238     }
1239 #endif
1240     msrs[n++].index = MSR_KVM_SYSTEM_TIME;
1241     msrs[n++].index = MSR_KVM_WALL_CLOCK;
1242     if (has_msr_async_pf_en) {
1243         msrs[n++].index = MSR_KVM_ASYNC_PF_EN;
1244     }
1245
1246     if (env->mcg_cap) {
1247         msrs[n++].index = MSR_MCG_STATUS;
1248         msrs[n++].index = MSR_MCG_CTL;
1249         for (i = 0; i < (env->mcg_cap & 0xff) * 4; i++) {
1250             msrs[n++].index = MSR_MC0_CTL + i;
1251         }
1252     }
1253
1254     msr_data.info.nmsrs = n;
1255     ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
1256     if (ret < 0) {
1257         return ret;
1258     }
1259
1260     for (i = 0; i < ret; i++) {
1261         switch (msrs[i].index) {
1262         case MSR_IA32_SYSENTER_CS:
1263             env->sysenter_cs = msrs[i].data;
1264             break;
1265         case MSR_IA32_SYSENTER_ESP:
1266             env->sysenter_esp = msrs[i].data;
1267             break;
1268         case MSR_IA32_SYSENTER_EIP:
1269             env->sysenter_eip = msrs[i].data;
1270             break;
1271         case MSR_PAT:
1272             env->pat = msrs[i].data;
1273             break;
1274         case MSR_STAR:
1275             env->star = msrs[i].data;
1276             break;
1277 #ifdef TARGET_X86_64
1278         case MSR_CSTAR:
1279             env->cstar = msrs[i].data;
1280             break;
1281         case MSR_KERNELGSBASE:
1282             env->kernelgsbase = msrs[i].data;
1283             break;
1284         case MSR_FMASK:
1285             env->fmask = msrs[i].data;
1286             break;
1287         case MSR_LSTAR:
1288             env->lstar = msrs[i].data;
1289             break;
1290 #endif
1291         case MSR_IA32_TSC:
1292             env->tsc = msrs[i].data;
1293             break;
1294         case MSR_IA32_TSCDEADLINE:
1295             env->tsc_deadline = msrs[i].data;
1296             break;
1297         case MSR_VM_HSAVE_PA:
1298             env->vm_hsave = msrs[i].data;
1299             break;
1300         case MSR_KVM_SYSTEM_TIME:
1301             env->system_time_msr = msrs[i].data;
1302             break;
1303         case MSR_KVM_WALL_CLOCK:
1304             env->wall_clock_msr = msrs[i].data;
1305             break;
1306         case MSR_MCG_STATUS:
1307             env->mcg_status = msrs[i].data;
1308             break;
1309         case MSR_MCG_CTL:
1310             env->mcg_ctl = msrs[i].data;
1311             break;
1312         case MSR_IA32_MISC_ENABLE:
1313             env->msr_ia32_misc_enable = msrs[i].data;
1314             break;
1315         default:
1316             if (msrs[i].index >= MSR_MC0_CTL &&
1317                 msrs[i].index < MSR_MC0_CTL + (env->mcg_cap & 0xff) * 4) {
1318                 env->mce_banks[msrs[i].index - MSR_MC0_CTL] = msrs[i].data;
1319             }
1320             break;
1321         case MSR_KVM_ASYNC_PF_EN:
1322             env->async_pf_en_msr = msrs[i].data;
1323             break;
1324         }
1325     }
1326
1327     return 0;
1328 }
1329
1330 static int kvm_put_mp_state(CPUState *env)
1331 {
1332     struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
1333
1334     return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state);
1335 }
1336
1337 static int kvm_get_mp_state(CPUState *env)
1338 {
1339     struct kvm_mp_state mp_state;
1340     int ret;
1341
1342     ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state);
1343     if (ret < 0) {
1344         return ret;
1345     }
1346     env->mp_state = mp_state.mp_state;
1347     if (kvm_irqchip_in_kernel()) {
1348         env->halted = (mp_state.mp_state == KVM_MP_STATE_HALTED);
1349     }
1350     return 0;
1351 }
1352
1353 static int kvm_get_apic(CPUState *env)
1354 {
1355     DeviceState *apic = env->apic_state;
1356     struct kvm_lapic_state kapic;
1357     int ret;
1358
1359     if (apic && kvm_irqchip_in_kernel()) {
1360         ret = kvm_vcpu_ioctl(env, KVM_GET_LAPIC, &kapic);
1361         if (ret < 0) {
1362             return ret;
1363         }
1364
1365         kvm_get_apic_state(apic, &kapic);
1366     }
1367     return 0;
1368 }
1369
1370 static int kvm_put_apic(CPUState *env)
1371 {
1372     DeviceState *apic = env->apic_state;
1373     struct kvm_lapic_state kapic;
1374
1375     if (apic && kvm_irqchip_in_kernel()) {
1376         kvm_put_apic_state(apic, &kapic);
1377
1378         return kvm_vcpu_ioctl(env, KVM_SET_LAPIC, &kapic);
1379     }
1380     return 0;
1381 }
1382
1383 static int kvm_put_vcpu_events(CPUState *env, int level)
1384 {
1385     struct kvm_vcpu_events events;
1386
1387     if (!kvm_has_vcpu_events()) {
1388         return 0;
1389     }
1390
1391     events.exception.injected = (env->exception_injected >= 0);
1392     events.exception.nr = env->exception_injected;
1393     events.exception.has_error_code = env->has_error_code;
1394     events.exception.error_code = env->error_code;
1395
1396     events.interrupt.injected = (env->interrupt_injected >= 0);
1397     events.interrupt.nr = env->interrupt_injected;
1398     events.interrupt.soft = env->soft_interrupt;
1399
1400     events.nmi.injected = env->nmi_injected;
1401     events.nmi.pending = env->nmi_pending;
1402     events.nmi.masked = !!(env->hflags2 & HF2_NMI_MASK);
1403
1404     events.sipi_vector = env->sipi_vector;
1405
1406     events.flags = 0;
1407     if (level >= KVM_PUT_RESET_STATE) {
1408         events.flags |=
1409             KVM_VCPUEVENT_VALID_NMI_PENDING | KVM_VCPUEVENT_VALID_SIPI_VECTOR;
1410     }
1411
1412     return kvm_vcpu_ioctl(env, KVM_SET_VCPU_EVENTS, &events);
1413 }
1414
1415 static int kvm_get_vcpu_events(CPUState *env)
1416 {
1417     struct kvm_vcpu_events events;
1418     int ret;
1419
1420     if (!kvm_has_vcpu_events()) {
1421         return 0;
1422     }
1423
1424     ret = kvm_vcpu_ioctl(env, KVM_GET_VCPU_EVENTS, &events);
1425     if (ret < 0) {
1426        return ret;
1427     }
1428     env->exception_injected =
1429        events.exception.injected ? events.exception.nr : -1;
1430     env->has_error_code = events.exception.has_error_code;
1431     env->error_code = events.exception.error_code;
1432
1433     env->interrupt_injected =
1434         events.interrupt.injected ? events.interrupt.nr : -1;
1435     env->soft_interrupt = events.interrupt.soft;
1436
1437     env->nmi_injected = events.nmi.injected;
1438     env->nmi_pending = events.nmi.pending;
1439     if (events.nmi.masked) {
1440         env->hflags2 |= HF2_NMI_MASK;
1441     } else {
1442         env->hflags2 &= ~HF2_NMI_MASK;
1443     }
1444
1445     env->sipi_vector = events.sipi_vector;
1446
1447     return 0;
1448 }
1449
1450 static int kvm_guest_debug_workarounds(CPUState *env)
1451 {
1452     int ret = 0;
1453     unsigned long reinject_trap = 0;
1454
1455     if (!kvm_has_vcpu_events()) {
1456         if (env->exception_injected == 1) {
1457             reinject_trap = KVM_GUESTDBG_INJECT_DB;
1458         } else if (env->exception_injected == 3) {
1459             reinject_trap = KVM_GUESTDBG_INJECT_BP;
1460         }
1461         env->exception_injected = -1;
1462     }
1463
1464     /*
1465      * Kernels before KVM_CAP_X86_ROBUST_SINGLESTEP overwrote flags.TF
1466      * injected via SET_GUEST_DEBUG while updating GP regs. Work around this
1467      * by updating the debug state once again if single-stepping is on.
1468      * Another reason to call kvm_update_guest_debug here is a pending debug
1469      * trap raise by the guest. On kernels without SET_VCPU_EVENTS we have to
1470      * reinject them via SET_GUEST_DEBUG.
1471      */
1472     if (reinject_trap ||
1473         (!kvm_has_robust_singlestep() && env->singlestep_enabled)) {
1474         ret = kvm_update_guest_debug(env, reinject_trap);
1475     }
1476     return ret;
1477 }
1478
1479 static int kvm_put_debugregs(CPUState *env)
1480 {
1481     struct kvm_debugregs dbgregs;
1482     int i;
1483
1484     if (!kvm_has_debugregs()) {
1485         return 0;
1486     }
1487
1488     for (i = 0; i < 4; i++) {
1489         dbgregs.db[i] = env->dr[i];
1490     }
1491     dbgregs.dr6 = env->dr[6];
1492     dbgregs.dr7 = env->dr[7];
1493     dbgregs.flags = 0;
1494
1495     return kvm_vcpu_ioctl(env, KVM_SET_DEBUGREGS, &dbgregs);
1496 }
1497
1498 static int kvm_get_debugregs(CPUState *env)
1499 {
1500     struct kvm_debugregs dbgregs;
1501     int i, ret;
1502
1503     if (!kvm_has_debugregs()) {
1504         return 0;
1505     }
1506
1507     ret = kvm_vcpu_ioctl(env, KVM_GET_DEBUGREGS, &dbgregs);
1508     if (ret < 0) {
1509         return ret;
1510     }
1511     for (i = 0; i < 4; i++) {
1512         env->dr[i] = dbgregs.db[i];
1513     }
1514     env->dr[4] = env->dr[6] = dbgregs.dr6;
1515     env->dr[5] = env->dr[7] = dbgregs.dr7;
1516
1517     return 0;
1518 }
1519
1520 int kvm_arch_put_registers(CPUState *env, int level)
1521 {
1522     int ret;
1523
1524     assert(cpu_is_stopped(env) || qemu_cpu_is_self(env));
1525
1526     ret = kvm_getput_regs(env, 1);
1527     if (ret < 0) {
1528         return ret;
1529     }
1530     ret = kvm_put_xsave(env);
1531     if (ret < 0) {
1532         return ret;
1533     }
1534     ret = kvm_put_xcrs(env);
1535     if (ret < 0) {
1536         return ret;
1537     }
1538     ret = kvm_put_sregs(env);
1539     if (ret < 0) {
1540         return ret;
1541     }
1542     /* must be before kvm_put_msrs */
1543     ret = kvm_inject_mce_oldstyle(env);
1544     if (ret < 0) {
1545         return ret;
1546     }
1547     ret = kvm_put_msrs(env, level);
1548     if (ret < 0) {
1549         return ret;
1550     }
1551     if (level >= KVM_PUT_RESET_STATE) {
1552         ret = kvm_put_mp_state(env);
1553         if (ret < 0) {
1554             return ret;
1555         }
1556         ret = kvm_put_apic(env);
1557         if (ret < 0) {
1558             return ret;
1559         }
1560     }
1561     ret = kvm_put_vcpu_events(env, level);
1562     if (ret < 0) {
1563         return ret;
1564     }
1565     ret = kvm_put_debugregs(env);
1566     if (ret < 0) {
1567         return ret;
1568     }
1569     /* must be last */
1570     ret = kvm_guest_debug_workarounds(env);
1571     if (ret < 0) {
1572         return ret;
1573     }
1574     return 0;
1575 }
1576
1577 int kvm_arch_get_registers(CPUState *env)
1578 {
1579     int ret;
1580
1581     assert(cpu_is_stopped(env) || qemu_cpu_is_self(env));
1582
1583     ret = kvm_getput_regs(env, 0);
1584     if (ret < 0) {
1585         return ret;
1586     }
1587     ret = kvm_get_xsave(env);
1588     if (ret < 0) {
1589         return ret;
1590     }
1591     ret = kvm_get_xcrs(env);
1592     if (ret < 0) {
1593         return ret;
1594     }
1595     ret = kvm_get_sregs(env);
1596     if (ret < 0) {
1597         return ret;
1598     }
1599     ret = kvm_get_msrs(env);
1600     if (ret < 0) {
1601         return ret;
1602     }
1603     ret = kvm_get_mp_state(env);
1604     if (ret < 0) {
1605         return ret;
1606     }
1607     ret = kvm_get_apic(env);
1608     if (ret < 0) {
1609         return ret;
1610     }
1611     ret = kvm_get_vcpu_events(env);
1612     if (ret < 0) {
1613         return ret;
1614     }
1615     ret = kvm_get_debugregs(env);
1616     if (ret < 0) {
1617         return ret;
1618     }
1619     return 0;
1620 }
1621
1622 void kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
1623 {
1624     int ret;
1625
1626     /* Inject NMI */
1627     if (env->interrupt_request & CPU_INTERRUPT_NMI) {
1628         env->interrupt_request &= ~CPU_INTERRUPT_NMI;
1629         DPRINTF("injected NMI\n");
1630         ret = kvm_vcpu_ioctl(env, KVM_NMI);
1631         if (ret < 0) {
1632             fprintf(stderr, "KVM: injection failed, NMI lost (%s)\n",
1633                     strerror(-ret));
1634         }
1635     }
1636
1637     if (!kvm_irqchip_in_kernel()) {
1638         /* Force the VCPU out of its inner loop to process the INIT request */
1639         if (env->interrupt_request & CPU_INTERRUPT_INIT) {
1640             env->exit_request = 1;
1641         }
1642
1643         /* Try to inject an interrupt if the guest can accept it */
1644         if (run->ready_for_interrupt_injection &&
1645             (env->interrupt_request & CPU_INTERRUPT_HARD) &&
1646             (env->eflags & IF_MASK)) {
1647             int irq;
1648
1649             env->interrupt_request &= ~CPU_INTERRUPT_HARD;
1650             irq = cpu_get_pic_interrupt(env);
1651             if (irq >= 0) {
1652                 struct kvm_interrupt intr;
1653
1654                 intr.irq = irq;
1655                 DPRINTF("injected interrupt %d\n", irq);
1656                 ret = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
1657                 if (ret < 0) {
1658                     fprintf(stderr,
1659                             "KVM: injection failed, interrupt lost (%s)\n",
1660                             strerror(-ret));
1661                 }
1662             }
1663         }
1664
1665         /* If we have an interrupt but the guest is not ready to receive an
1666          * interrupt, request an interrupt window exit.  This will
1667          * cause a return to userspace as soon as the guest is ready to
1668          * receive interrupts. */
1669         if ((env->interrupt_request & CPU_INTERRUPT_HARD)) {
1670             run->request_interrupt_window = 1;
1671         } else {
1672             run->request_interrupt_window = 0;
1673         }
1674
1675         DPRINTF("setting tpr\n");
1676         run->cr8 = cpu_get_apic_tpr(env->apic_state);
1677     }
1678 }
1679
1680 void kvm_arch_post_run(CPUState *env, struct kvm_run *run)
1681 {
1682     if (run->if_flag) {
1683         env->eflags |= IF_MASK;
1684     } else {
1685         env->eflags &= ~IF_MASK;
1686     }
1687     cpu_set_apic_tpr(env->apic_state, run->cr8);
1688     cpu_set_apic_base(env->apic_state, run->apic_base);
1689 }
1690
1691 int kvm_arch_process_async_events(CPUState *env)
1692 {
1693     if (env->interrupt_request & CPU_INTERRUPT_MCE) {
1694         /* We must not raise CPU_INTERRUPT_MCE if it's not supported. */
1695         assert(env->mcg_cap);
1696
1697         env->interrupt_request &= ~CPU_INTERRUPT_MCE;
1698
1699         kvm_cpu_synchronize_state(env);
1700
1701         if (env->exception_injected == EXCP08_DBLE) {
1702             /* this means triple fault */
1703             qemu_system_reset_request();
1704             env->exit_request = 1;
1705             return 0;
1706         }
1707         env->exception_injected = EXCP12_MCHK;
1708         env->has_error_code = 0;
1709
1710         env->halted = 0;
1711         if (kvm_irqchip_in_kernel() && env->mp_state == KVM_MP_STATE_HALTED) {
1712             env->mp_state = KVM_MP_STATE_RUNNABLE;
1713         }
1714     }
1715
1716     if (kvm_irqchip_in_kernel()) {
1717         return 0;
1718     }
1719
1720     if (((env->interrupt_request & CPU_INTERRUPT_HARD) &&
1721          (env->eflags & IF_MASK)) ||
1722         (env->interrupt_request & CPU_INTERRUPT_NMI)) {
1723         env->halted = 0;
1724     }
1725     if (env->interrupt_request & CPU_INTERRUPT_INIT) {
1726         kvm_cpu_synchronize_state(env);
1727         do_cpu_init(env);
1728     }
1729     if (env->interrupt_request & CPU_INTERRUPT_SIPI) {
1730         kvm_cpu_synchronize_state(env);
1731         do_cpu_sipi(env);
1732     }
1733
1734     return env->halted;
1735 }
1736
1737 static int kvm_handle_halt(CPUState *env)
1738 {
1739     if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
1740           (env->eflags & IF_MASK)) &&
1741         !(env->interrupt_request & CPU_INTERRUPT_NMI)) {
1742         env->halted = 1;
1743         return EXCP_HLT;
1744     }
1745
1746     return 0;
1747 }
1748
1749 int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
1750 {
1751     static const uint8_t int3 = 0xcc;
1752
1753     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 0) ||
1754         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&int3, 1, 1)) {
1755         return -EINVAL;
1756     }
1757     return 0;
1758 }
1759
1760 int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
1761 {
1762     uint8_t int3;
1763
1764     if (cpu_memory_rw_debug(env, bp->pc, &int3, 1, 0) || int3 != 0xcc ||
1765         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
1766         return -EINVAL;
1767     }
1768     return 0;
1769 }
1770
1771 static struct {
1772     target_ulong addr;
1773     int len;
1774     int type;
1775 } hw_breakpoint[4];
1776
1777 static int nb_hw_breakpoint;
1778
1779 static int find_hw_breakpoint(target_ulong addr, int len, int type)
1780 {
1781     int n;
1782
1783     for (n = 0; n < nb_hw_breakpoint; n++) {
1784         if (hw_breakpoint[n].addr == addr && hw_breakpoint[n].type == type &&
1785             (hw_breakpoint[n].len == len || len == -1)) {
1786             return n;
1787         }
1788     }
1789     return -1;
1790 }
1791
1792 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
1793                                   target_ulong len, int type)
1794 {
1795     switch (type) {
1796     case GDB_BREAKPOINT_HW:
1797         len = 1;
1798         break;
1799     case GDB_WATCHPOINT_WRITE:
1800     case GDB_WATCHPOINT_ACCESS:
1801         switch (len) {
1802         case 1:
1803             break;
1804         case 2:
1805         case 4:
1806         case 8:
1807             if (addr & (len - 1)) {
1808                 return -EINVAL;
1809             }
1810             break;
1811         default:
1812             return -EINVAL;
1813         }
1814         break;
1815     default:
1816         return -ENOSYS;
1817     }
1818
1819     if (nb_hw_breakpoint == 4) {
1820         return -ENOBUFS;
1821     }
1822     if (find_hw_breakpoint(addr, len, type) >= 0) {
1823         return -EEXIST;
1824     }
1825     hw_breakpoint[nb_hw_breakpoint].addr = addr;
1826     hw_breakpoint[nb_hw_breakpoint].len = len;
1827     hw_breakpoint[nb_hw_breakpoint].type = type;
1828     nb_hw_breakpoint++;
1829
1830     return 0;
1831 }
1832
1833 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
1834                                   target_ulong len, int type)
1835 {
1836     int n;
1837
1838     n = find_hw_breakpoint(addr, (type == GDB_BREAKPOINT_HW) ? 1 : len, type);
1839     if (n < 0) {
1840         return -ENOENT;
1841     }
1842     nb_hw_breakpoint--;
1843     hw_breakpoint[n] = hw_breakpoint[nb_hw_breakpoint];
1844
1845     return 0;
1846 }
1847
1848 void kvm_arch_remove_all_hw_breakpoints(void)
1849 {
1850     nb_hw_breakpoint = 0;
1851 }
1852
1853 static CPUWatchpoint hw_watchpoint;
1854
1855 static int kvm_handle_debug(struct kvm_debug_exit_arch *arch_info)
1856 {
1857     int ret = 0;
1858     int n;
1859
1860     if (arch_info->exception == 1) {
1861         if (arch_info->dr6 & (1 << 14)) {
1862             if (cpu_single_env->singlestep_enabled) {
1863                 ret = EXCP_DEBUG;
1864             }
1865         } else {
1866             for (n = 0; n < 4; n++) {
1867                 if (arch_info->dr6 & (1 << n)) {
1868                     switch ((arch_info->dr7 >> (16 + n*4)) & 0x3) {
1869                     case 0x0:
1870                         ret = EXCP_DEBUG;
1871                         break;
1872                     case 0x1:
1873                         ret = EXCP_DEBUG;
1874                         cpu_single_env->watchpoint_hit = &hw_watchpoint;
1875                         hw_watchpoint.vaddr = hw_breakpoint[n].addr;
1876                         hw_watchpoint.flags = BP_MEM_WRITE;
1877                         break;
1878                     case 0x3:
1879                         ret = EXCP_DEBUG;
1880                         cpu_single_env->watchpoint_hit = &hw_watchpoint;
1881                         hw_watchpoint.vaddr = hw_breakpoint[n].addr;
1882                         hw_watchpoint.flags = BP_MEM_ACCESS;
1883                         break;
1884                     }
1885                 }
1886             }
1887         }
1888     } else if (kvm_find_sw_breakpoint(cpu_single_env, arch_info->pc)) {
1889         ret = EXCP_DEBUG;
1890     }
1891     if (ret == 0) {
1892         cpu_synchronize_state(cpu_single_env);
1893         assert(cpu_single_env->exception_injected == -1);
1894
1895         /* pass to guest */
1896         cpu_single_env->exception_injected = arch_info->exception;
1897         cpu_single_env->has_error_code = 0;
1898     }
1899
1900     return ret;
1901 }
1902
1903 void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg)
1904 {
1905     const uint8_t type_code[] = {
1906         [GDB_BREAKPOINT_HW] = 0x0,
1907         [GDB_WATCHPOINT_WRITE] = 0x1,
1908         [GDB_WATCHPOINT_ACCESS] = 0x3
1909     };
1910     const uint8_t len_code[] = {
1911         [1] = 0x0, [2] = 0x1, [4] = 0x3, [8] = 0x2
1912     };
1913     int n;
1914
1915     if (kvm_sw_breakpoints_active(env)) {
1916         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
1917     }
1918     if (nb_hw_breakpoint > 0) {
1919         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
1920         dbg->arch.debugreg[7] = 0x0600;
1921         for (n = 0; n < nb_hw_breakpoint; n++) {
1922             dbg->arch.debugreg[n] = hw_breakpoint[n].addr;
1923             dbg->arch.debugreg[7] |= (2 << (n * 2)) |
1924                 (type_code[hw_breakpoint[n].type] << (16 + n*4)) |
1925                 ((uint32_t)len_code[hw_breakpoint[n].len] << (18 + n*4));
1926         }
1927     }
1928 }
1929
1930 static bool host_supports_vmx(void)
1931 {
1932     uint32_t ecx, unused;
1933
1934     host_cpuid(1, 0, &unused, &unused, &ecx, &unused);
1935     return ecx & CPUID_EXT_VMX;
1936 }
1937
1938 #define VMX_INVALID_GUEST_STATE 0x80000021
1939
1940 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
1941 {
1942     uint64_t code;
1943     int ret;
1944
1945     switch (run->exit_reason) {
1946     case KVM_EXIT_HLT:
1947         DPRINTF("handle_hlt\n");
1948         ret = kvm_handle_halt(env);
1949         break;
1950     case KVM_EXIT_SET_TPR:
1951         ret = 0;
1952         break;
1953     case KVM_EXIT_FAIL_ENTRY:
1954         code = run->fail_entry.hardware_entry_failure_reason;
1955         fprintf(stderr, "KVM: entry failed, hardware error 0x%" PRIx64 "\n",
1956                 code);
1957         if (host_supports_vmx() && code == VMX_INVALID_GUEST_STATE) {
1958             fprintf(stderr,
1959                     "\nIf you're running a guest on an Intel machine without "
1960                         "unrestricted mode\n"
1961                     "support, the failure can be most likely due to the guest "
1962                         "entering an invalid\n"
1963                     "state for Intel VT. For example, the guest maybe running "
1964                         "in big real mode\n"
1965                     "which is not supported on less recent Intel processors."
1966                         "\n\n");
1967         }
1968         ret = -1;
1969         break;
1970     case KVM_EXIT_EXCEPTION:
1971         fprintf(stderr, "KVM: exception %d exit (error code 0x%x)\n",
1972                 run->ex.exception, run->ex.error_code);
1973         ret = -1;
1974         break;
1975     case KVM_EXIT_DEBUG:
1976         DPRINTF("kvm_exit_debug\n");
1977         ret = kvm_handle_debug(&run->debug.arch);
1978         break;
1979     default:
1980         fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
1981         ret = -1;
1982         break;
1983     }
1984
1985     return ret;
1986 }
1987
1988 bool kvm_arch_stop_on_emulation_error(CPUState *env)
1989 {
1990     return !(env->cr[0] & CR0_PE_MASK) ||
1991            ((env->segs[R_CS].selector  & 3) != 3);
1992 }
1993
1994 void kvm_arch_init_irq_routing(KVMState *s)
1995 {
1996     if (!kvm_check_extension(s, KVM_CAP_IRQ_ROUTING)) {
1997         /* If kernel can't do irq routing, interrupt source
1998          * override 0->2 cannot be set up as required by HPET.
1999          * So we have to disable it.
2000          */
2001         no_hpet = 1;
2002     }
2003 }