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
  19 #include <linux/kvm.h>
  20
  21 #include "qemu-common.h"
  22 #include "sysemu.h"
  23 #include "kvm.h"
  24 #include "cpu.h"
  25
  26 //#define DEBUG_KVM
  27
  28 #ifdef DEBUG_KVM
  29 #define dprintf(fmt, ...) \
  30     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  31 #else
  32 #define dprintf(fmt, ...) \
  33     do { } while (0)
  34 #endif
  35
  36 int kvm_arch_init_vcpu(CPUState *env)
  37 {
  38     struct {
  39         struct kvm_cpuid cpuid;
  40         struct kvm_cpuid_entry entries[100];
  41     } __attribute__((packed)) cpuid_data;
  42     uint32_t limit, i, cpuid_i;
  43     uint32_t eax, ebx, ecx, edx;
  44
  45     cpuid_i = 0;
  46
  47     cpu_x86_cpuid(env, 0, &eax, &ebx, &ecx, &edx);
  48     limit = eax;
  49
  50     for (i = 0; i <= limit; i++) {
  51         struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
  52
  53         cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx);
  54         c->function = i;
  55         c->eax = eax;
  56         c->ebx = ebx;
  57         c->ecx = ecx;
  58         c->edx = edx;
  59     }
  60
  61     cpu_x86_cpuid(env, 0x80000000, &eax, &ebx, &ecx, &edx);
  62     limit = eax;
  63
  64     for (i = 0x80000000; i <= limit; i++) {
  65         struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
  66
  67         cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx);
  68         c->function = i;
  69         c->eax = eax;
  70         c->ebx = ebx;
  71         c->ecx = ecx;
  72         c->edx = edx;
  73     }
  74
  75     cpuid_data.cpuid.nent = cpuid_i;
  76
  77     return kvm_vcpu_ioctl(env, KVM_SET_CPUID, &cpuid_data);
  78 }
  79
  80 static int kvm_has_msr_star(CPUState *env)
  81 {
  82     static int has_msr_star;
  83     int ret;
  84
  85     /* first time */
  86     if (has_msr_star == 0) {
  87         struct kvm_msr_list msr_list, *kvm_msr_list;
  88
  89         has_msr_star = -1;
  90
  91         /* Obtain MSR list from KVM.  These are the MSRs that we must
  92          * save/restore */
  93         msr_list.nmsrs = 0;
  94         ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list);
  95         if (ret < 0)
  96             return 0;
  97
  98         kvm_msr_list = qemu_mallocz(sizeof(msr_list) +
  99                                     msr_list.nmsrs * sizeof(msr_list.indices[0]));
 100         if (kvm_msr_list == NULL)
 101             return 0;
 102
 103         kvm_msr_list->nmsrs = msr_list.nmsrs;
 104         ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
 105         if (ret >= 0) {
 106             int i;
 107
 108             for (i = 0; i < kvm_msr_list->nmsrs; i++) {
 109                 if (kvm_msr_list->indices[i] == MSR_STAR) {
 110                     has_msr_star = 1;
 111                     break;
 112                 }
 113             }
 114         }
 115
 116         free(kvm_msr_list);
 117     }
 118
 119     if (has_msr_star == 1)
 120         return 1;
 121     return 0;
 122 }
 123
 124 int kvm_arch_init(KVMState *s, int smp_cpus)
 125 {
 126     int ret;
 127
 128     /* create vm86 tss.  KVM uses vm86 mode to emulate 16-bit code
 129      * directly.  In order to use vm86 mode, a TSS is needed.  Since this
 130      * must be part of guest physical memory, we need to allocate it.  Older
 131      * versions of KVM just assumed that it would be at the end of physical
 132      * memory but that doesn't work with more than 4GB of memory.  We simply
 133      * refuse to work with those older versions of KVM. */
 134     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR);
 135     if (ret <= 0) {
 136         fprintf(stderr, "kvm does not support KVM_CAP_SET_TSS_ADDR\n");
 137         return ret;
 138     }
 139
 140     /* this address is 3 pages before the bios, and the bios should present
 141      * as unavaible memory.  FIXME, need to ensure the e820 map deals with
 142      * this?
 143      */
 144     return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000);
 145 }
 146
 147 static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 148 {
 149     lhs->selector = rhs->selector;
 150     lhs->base = rhs->base;
 151     lhs->limit = rhs->limit;
 152     lhs->type = 3;
 153     lhs->present = 1;
 154     lhs->dpl = 3;
 155     lhs->db = 0;
 156     lhs->s = 1;
 157     lhs->l = 0;
 158     lhs->g = 0;
 159     lhs->avl = 0;
 160     lhs->unusable = 0;
 161 }
 162
 163 static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 164 {
 165     unsigned flags = rhs->flags;
 166     lhs->selector = rhs->selector;
 167     lhs->base = rhs->base;
 168     lhs->limit = rhs->limit;
 169     lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
 170     lhs->present = (flags & DESC_P_MASK) != 0;
 171     lhs->dpl = rhs->selector & 3;
 172     lhs->db = (flags >> DESC_B_SHIFT) & 1;
 173     lhs->s = (flags & DESC_S_MASK) != 0;
 174     lhs->l = (flags >> DESC_L_SHIFT) & 1;
 175     lhs->g = (flags & DESC_G_MASK) != 0;
 176     lhs->avl = (flags & DESC_AVL_MASK) != 0;
 177     lhs->unusable = 0;
 178 }
 179
 180 static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
 181 {
 182     lhs->selector = rhs->selector;
 183     lhs->base = rhs->base;
 184     lhs->limit = rhs->limit;
 185     lhs->flags =
 186         (rhs->type << DESC_TYPE_SHIFT)
 187         | (rhs->present * DESC_P_MASK)
 188         | (rhs->dpl << DESC_DPL_SHIFT)
 189         | (rhs->db << DESC_B_SHIFT)
 190         | (rhs->s * DESC_S_MASK)
 191         | (rhs->l << DESC_L_SHIFT)
 192         | (rhs->g * DESC_G_MASK)
 193         | (rhs->avl * DESC_AVL_MASK);
 194 }
 195
 196 static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set)
 197 {
 198     if (set)
 199         *kvm_reg = *qemu_reg;
 200     else
 201         *qemu_reg = *kvm_reg;
 202 }
 203
 204 static int kvm_getput_regs(CPUState *env, int set)
 205 {
 206     struct kvm_regs regs;
 207     int ret = 0;
 208
 209     if (!set) {
 210         ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 211         if (ret < 0)
 212             return ret;
 213     }
 214
 215     kvm_getput_reg(&regs.rax, &env->regs[R_EAX], set);
 216     kvm_getput_reg(&regs.rbx, &env->regs[R_EBX], set);
 217     kvm_getput_reg(&regs.rcx, &env->regs[R_ECX], set);
 218     kvm_getput_reg(&regs.rdx, &env->regs[R_EDX], set);
 219     kvm_getput_reg(&regs.rsi, &env->regs[R_ESI], set);
 220     kvm_getput_reg(&regs.rdi, &env->regs[R_EDI], set);
 221     kvm_getput_reg(&regs.rsp, &env->regs[R_ESP], set);
 222     kvm_getput_reg(&regs.rbp, &env->regs[R_EBP], set);
 223 #ifdef TARGET_X86_64
 224     kvm_getput_reg(&regs.r8, &env->regs[8], set);
 225     kvm_getput_reg(&regs.r9, &env->regs[9], set);
 226     kvm_getput_reg(&regs.r10, &env->regs[10], set);
 227     kvm_getput_reg(&regs.r11, &env->regs[11], set);
 228     kvm_getput_reg(&regs.r12, &env->regs[12], set);
 229     kvm_getput_reg(&regs.r13, &env->regs[13], set);
 230     kvm_getput_reg(&regs.r14, &env->regs[14], set);
 231     kvm_getput_reg(&regs.r15, &env->regs[15], set);
 232 #endif
 233
 234     kvm_getput_reg(&regs.rflags, &env->eflags, set);
 235     kvm_getput_reg(&regs.rip, &env->eip, set);
 236
 237     if (set)
 238         ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 239
 240     return ret;
 241 }
 242
 243 static int kvm_put_fpu(CPUState *env)
 244 {
 245     struct kvm_fpu fpu;
 246     int i;
 247
 248     memset(&fpu, 0, sizeof fpu);
 249     fpu.fsw = env->fpus & ~(7 << 11);
 250     fpu.fsw |= (env->fpstt & 7) << 11;
 251     fpu.fcw = env->fpuc;
 252     for (i = 0; i < 8; ++i)
 253         fpu.ftwx |= (!env->fptags[i]) << i;
 254     memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
 255     memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs);
 256     fpu.mxcsr = env->mxcsr;
 257
 258     return kvm_vcpu_ioctl(env, KVM_SET_FPU, &fpu);
 259 }
 260
 261 static int kvm_put_sregs(CPUState *env)
 262 {
 263     struct kvm_sregs sregs;
 264
 265     memcpy(sregs.interrupt_bitmap,
 266            env->interrupt_bitmap,
 267            sizeof(sregs.interrupt_bitmap));
 268
 269     if ((env->eflags & VM_MASK)) {
 270             set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
 271             set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
 272             set_v8086_seg(&sregs.es, &env->segs[R_ES]);
 273             set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
 274             set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
 275             set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
 276     } else {
 277             set_seg(&sregs.cs, &env->segs[R_CS]);
 278             set_seg(&sregs.ds, &env->segs[R_DS]);
 279             set_seg(&sregs.es, &env->segs[R_ES]);
 280             set_seg(&sregs.fs, &env->segs[R_FS]);
 281             set_seg(&sregs.gs, &env->segs[R_GS]);
 282             set_seg(&sregs.ss, &env->segs[R_SS]);
 283
 284             if (env->cr[0] & CR0_PE_MASK) {
 285                 /* force ss cpl to cs cpl */
 286                 sregs.ss.selector = (sregs.ss.selector & ~3) |
 287                         (sregs.cs.selector & 3);
 288                 sregs.ss.dpl = sregs.ss.selector & 3;
 289             }
 290     }
 291
 292     set_seg(&sregs.tr, &env->tr);
 293     set_seg(&sregs.ldt, &env->ldt);
 294
 295     sregs.idt.limit = env->idt.limit;
 296     sregs.idt.base = env->idt.base;
 297     sregs.gdt.limit = env->gdt.limit;
 298     sregs.gdt.base = env->gdt.base;
 299
 300     sregs.cr0 = env->cr[0];
 301     sregs.cr2 = env->cr[2];
 302     sregs.cr3 = env->cr[3];
 303     sregs.cr4 = env->cr[4];
 304
 305     sregs.cr8 = cpu_get_apic_tpr(env);
 306     sregs.apic_base = cpu_get_apic_base(env);
 307
 308     sregs.efer = env->efer;
 309
 310     return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
 311 }
 312
 313 static void kvm_msr_entry_set(struct kvm_msr_entry *entry,
 314                               uint32_t index, uint64_t value)
 315 {
 316     entry->index = index;
 317     entry->data = value;
 318 }
 319
 320 static int kvm_put_msrs(CPUState *env)
 321 {
 322     struct {
 323         struct kvm_msrs info;
 324         struct kvm_msr_entry entries[100];
 325     } msr_data;
 326     struct kvm_msr_entry *msrs = msr_data.entries;
 327     int n = 0;
 328
 329     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
 330     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
 331     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
 332     if (kvm_has_msr_star(env))
 333         kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star);
 334     kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
 335     kvm_msr_entry_set(&msrs[n++], MSR_VM_HSAVE_PA, env->vm_hsave);
 336 #ifdef TARGET_X86_64
 337     /* FIXME if lm capable */
 338     kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
 339     kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
 340     kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
 341     kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
 342 #endif
 343     msr_data.info.nmsrs = n;
 344
 345     return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data);
 346
 347 }
 348
 349
 350 static int kvm_get_fpu(CPUState *env)
 351 {
 352     struct kvm_fpu fpu;
 353     int i, ret;
 354
 355     ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu);
 356     if (ret < 0)
 357         return ret;
 358
 359     env->fpstt = (fpu.fsw >> 11) & 7;
 360     env->fpus = fpu.fsw;
 361     env->fpuc = fpu.fcw;
 362     for (i = 0; i < 8; ++i)
 363         env->fptags[i] = !((fpu.ftwx >> i) & 1);
 364     memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
 365     memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
 366     env->mxcsr = fpu.mxcsr;
 367
 368     return 0;
 369 }
 370
 371 static int kvm_get_sregs(CPUState *env)
 372 {
 373     struct kvm_sregs sregs;
 374     uint32_t hflags;
 375     int ret;
 376
 377     ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
 378     if (ret < 0)
 379         return ret;
 380
 381     memcpy(env->interrupt_bitmap,
 382            sregs.interrupt_bitmap,
 383            sizeof(sregs.interrupt_bitmap));
 384
 385     get_seg(&env->segs[R_CS], &sregs.cs);
 386     get_seg(&env->segs[R_DS], &sregs.ds);
 387     get_seg(&env->segs[R_ES], &sregs.es);
 388     get_seg(&env->segs[R_FS], &sregs.fs);
 389     get_seg(&env->segs[R_GS], &sregs.gs);
 390     get_seg(&env->segs[R_SS], &sregs.ss);
 391
 392     get_seg(&env->tr, &sregs.tr);
 393     get_seg(&env->ldt, &sregs.ldt);
 394
 395     env->idt.limit = sregs.idt.limit;
 396     env->idt.base = sregs.idt.base;
 397     env->gdt.limit = sregs.gdt.limit;
 398     env->gdt.base = sregs.gdt.base;
 399
 400     env->cr[0] = sregs.cr0;
 401     env->cr[2] = sregs.cr2;
 402     env->cr[3] = sregs.cr3;
 403     env->cr[4] = sregs.cr4;
 404
 405     cpu_set_apic_base(env, sregs.apic_base);
 406
 407     env->efer = sregs.efer;
 408     //cpu_set_apic_tpr(env, sregs.cr8);
 409
 410 #define HFLAG_COPY_MASK ~( \
 411                         HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
 412                         HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
 413                         HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
 414                         HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
 415
 416
 417
 418     hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
 419     hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
 420     hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
 421             (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
 422     hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
 423     hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
 424             (HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
 425
 426     if (env->efer & MSR_EFER_LMA) {
 427         hflags |= HF_LMA_MASK;
 428     }
 429
 430     if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
 431         hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
 432     } else {
 433         hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
 434                 (DESC_B_SHIFT - HF_CS32_SHIFT);
 435         hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
 436                 (DESC_B_SHIFT - HF_SS32_SHIFT);
 437         if (!(env->cr[0] & CR0_PE_MASK) ||
 438                    (env->eflags & VM_MASK) ||
 439                    !(hflags & HF_CS32_MASK)) {
 440                 hflags |= HF_ADDSEG_MASK;
 441             } else {
 442                 hflags |= ((env->segs[R_DS].base |
 443                                 env->segs[R_ES].base |
 444                                 env->segs[R_SS].base) != 0) <<
 445                     HF_ADDSEG_SHIFT;
 446             }
 447     }
 448     env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
 449
 450     return 0;
 451 }
 452
 453 static int kvm_get_msrs(CPUState *env)
 454 {
 455     struct {
 456         struct kvm_msrs info;
 457         struct kvm_msr_entry entries[100];
 458     } msr_data;
 459     struct kvm_msr_entry *msrs = msr_data.entries;
 460     int ret, i, n;
 461
 462     n = 0;
 463     msrs[n++].index = MSR_IA32_SYSENTER_CS;
 464     msrs[n++].index = MSR_IA32_SYSENTER_ESP;
 465     msrs[n++].index = MSR_IA32_SYSENTER_EIP;
 466     if (kvm_has_msr_star(env))
 467         msrs[n++].index = MSR_STAR;
 468     msrs[n++].index = MSR_IA32_TSC;
 469     msrs[n++].index = MSR_VM_HSAVE_PA;
 470 #ifdef TARGET_X86_64
 471     /* FIXME lm_capable_kernel */
 472     msrs[n++].index = MSR_CSTAR;
 473     msrs[n++].index = MSR_KERNELGSBASE;
 474     msrs[n++].index = MSR_FMASK;
 475     msrs[n++].index = MSR_LSTAR;
 476 #endif
 477     msr_data.info.nmsrs = n;
 478     ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
 479     if (ret < 0)
 480         return ret;
 481
 482     for (i = 0; i < ret; i++) {
 483         switch (msrs[i].index) {
 484         case MSR_IA32_SYSENTER_CS:
 485             env->sysenter_cs = msrs[i].data;
 486             break;
 487         case MSR_IA32_SYSENTER_ESP:
 488             env->sysenter_esp = msrs[i].data;
 489             break;
 490         case MSR_IA32_SYSENTER_EIP:
 491             env->sysenter_eip = msrs[i].data;
 492             break;
 493         case MSR_STAR:
 494             env->star = msrs[i].data;
 495             break;
 496 #ifdef TARGET_X86_64
 497         case MSR_CSTAR:
 498             env->cstar = msrs[i].data;
 499             break;
 500         case MSR_KERNELGSBASE:
 501             env->kernelgsbase = msrs[i].data;
 502             break;
 503         case MSR_FMASK:
 504             env->fmask = msrs[i].data;
 505             break;
 506         case MSR_LSTAR:
 507             env->lstar = msrs[i].data;
 508             break;
 509 #endif
 510         case MSR_IA32_TSC:
 511             env->tsc = msrs[i].data;
 512             break;
 513         case MSR_VM_HSAVE_PA:
 514             env->vm_hsave = msrs[i].data;
 515             break;
 516         }
 517     }
 518
 519     return 0;
 520 }
 521
 522 int kvm_arch_put_registers(CPUState *env)
 523 {
 524     int ret;
 525
 526     ret = kvm_getput_regs(env, 1);
 527     if (ret < 0)
 528         return ret;
 529
 530     ret = kvm_put_fpu(env);
 531     if (ret < 0)
 532         return ret;
 533
 534     ret = kvm_put_sregs(env);
 535     if (ret < 0)
 536         return ret;
 537
 538     ret = kvm_put_msrs(env);
 539     if (ret < 0)
 540         return ret;
 541
 542     return 0;
 543 }
 544
 545 int kvm_arch_get_registers(CPUState *env)
 546 {
 547     int ret;
 548
 549     ret = kvm_getput_regs(env, 0);
 550     if (ret < 0)
 551         return ret;
 552
 553     ret = kvm_get_fpu(env);
 554     if (ret < 0)
 555         return ret;
 556
 557     ret = kvm_get_sregs(env);
 558     if (ret < 0)
 559         return ret;
 560
 561     ret = kvm_get_msrs(env);
 562     if (ret < 0)
 563         return ret;
 564
 565     return 0;
 566 }
 567
 568 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 569 {
 570     /* Try to inject an interrupt if the guest can accept it */
 571     if (run->ready_for_interrupt_injection &&
 572         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 573         (env->eflags & IF_MASK)) {
 574         int irq;
 575
 576         env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 577         irq = cpu_get_pic_interrupt(env);
 578         if (irq >= 0) {
 579             struct kvm_interrupt intr;
 580             intr.irq = irq;
 581             /* FIXME: errors */
 582             dprintf("injected interrupt %d\n", irq);
 583             kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
 584         }
 585     }
 586
 587     /* If we have an interrupt but the guest is not ready to receive an
 588      * interrupt, request an interrupt window exit.  This will
 589      * cause a return to userspace as soon as the guest is ready to
 590      * receive interrupts. */
 591     if ((env->interrupt_request & CPU_INTERRUPT_HARD))
 592         run->request_interrupt_window = 1;
 593     else
 594         run->request_interrupt_window = 0;
 595
 596     dprintf("setting tpr\n");
 597     run->cr8 = cpu_get_apic_tpr(env);
 598
 599     return 0;
 600 }
 601
 602 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 603 {
 604     if (run->if_flag)
 605         env->eflags |= IF_MASK;
 606     else
 607         env->eflags &= ~IF_MASK;
 608
 609     cpu_set_apic_tpr(env, run->cr8);
 610     cpu_set_apic_base(env, run->apic_base);
 611
 612     return 0;
 613 }
 614
 615 static int kvm_handle_halt(CPUState *env)
 616 {
 617     if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
 618           (env->eflags & IF_MASK)) &&
 619         !(env->interrupt_request & CPU_INTERRUPT_NMI)) {
 620         env->halted = 1;
 621         env->exception_index = EXCP_HLT;
 622         return 0;
 623     }
 624
 625     return 1;
 626 }
 627
 628 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 629 {
 630     int ret = 0;
 631
 632     switch (run->exit_reason) {
 633     case KVM_EXIT_HLT:
 634         dprintf("handle_hlt\n");
 635         ret = kvm_handle_halt(env);
 636         break;
 637     }
 638
 639     return ret;
 640 }