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