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 #ifdef TARGET_X86_64
 336     /* FIXME if lm capable */
 337     kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
 338     kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
 339     kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
 340     kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
 341 #endif
 342     msr_data.info.nmsrs = n;
 343
 344     return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data);
 345
 346 }
 347
 348
 349 static int kvm_get_fpu(CPUState *env)
 350 {
 351     struct kvm_fpu fpu;
 352     int i, ret;
 353
 354     ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu);
 355     if (ret < 0)
 356         return ret;
 357
 358     env->fpstt = (fpu.fsw >> 11) & 7;
 359     env->fpus = fpu.fsw;
 360     env->fpuc = fpu.fcw;
 361     for (i = 0; i < 8; ++i)
 362         env->fptags[i] = !((fpu.ftwx >> i) & 1);
 363     memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
 364     memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
 365     env->mxcsr = fpu.mxcsr;
 366
 367     return 0;
 368 }
 369
 370 static int kvm_get_sregs(CPUState *env)
 371 {
 372     struct kvm_sregs sregs;
 373     uint32_t hflags;
 374     int ret;
 375
 376     ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
 377     if (ret < 0)
 378         return ret;
 379
 380     memcpy(env->interrupt_bitmap,
 381            sregs.interrupt_bitmap,
 382            sizeof(sregs.interrupt_bitmap));
 383
 384     get_seg(&env->segs[R_CS], &sregs.cs);
 385     get_seg(&env->segs[R_DS], &sregs.ds);
 386     get_seg(&env->segs[R_ES], &sregs.es);
 387     get_seg(&env->segs[R_FS], &sregs.fs);
 388     get_seg(&env->segs[R_GS], &sregs.gs);
 389     get_seg(&env->segs[R_SS], &sregs.ss);
 390
 391     get_seg(&env->tr, &sregs.tr);
 392     get_seg(&env->ldt, &sregs.ldt);
 393
 394     env->idt.limit = sregs.idt.limit;
 395     env->idt.base = sregs.idt.base;
 396     env->gdt.limit = sregs.gdt.limit;
 397     env->gdt.base = sregs.gdt.base;
 398
 399     env->cr[0] = sregs.cr0;
 400     env->cr[2] = sregs.cr2;
 401     env->cr[3] = sregs.cr3;
 402     env->cr[4] = sregs.cr4;
 403
 404     cpu_set_apic_base(env, sregs.apic_base);
 405
 406     env->efer = sregs.efer;
 407     //cpu_set_apic_tpr(env, sregs.cr8);
 408
 409 #define HFLAG_COPY_MASK ~( \
 410                         HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
 411                         HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
 412                         HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
 413                         HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
 414
 415
 416
 417     hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
 418     hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
 419     hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
 420             (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
 421     hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
 422     hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
 423             (HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
 424
 425     if (env->efer & MSR_EFER_LMA) {
 426         hflags |= HF_LMA_MASK;
 427     }
 428
 429     if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
 430         hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
 431     } else {
 432         hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
 433                 (DESC_B_SHIFT - HF_CS32_SHIFT);
 434         hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
 435                 (DESC_B_SHIFT - HF_SS32_SHIFT);
 436         if (!(env->cr[0] & CR0_PE_MASK) ||
 437                    (env->eflags & VM_MASK) ||
 438                    !(hflags & HF_CS32_MASK)) {
 439                 hflags |= HF_ADDSEG_MASK;
 440             } else {
 441                 hflags |= ((env->segs[R_DS].base |
 442                                 env->segs[R_ES].base |
 443                                 env->segs[R_SS].base) != 0) <<
 444                     HF_ADDSEG_SHIFT;
 445             }
 446     }
 447     env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
 448     env->cc_src = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
 449     env->df = 1 - (2 * ((env->eflags >> 10) & 1));
 450     env->cc_op = CC_OP_EFLAGS;
 451     env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
 452
 453     return 0;
 454 }
 455
 456 static int kvm_get_msrs(CPUState *env)
 457 {
 458     struct {
 459         struct kvm_msrs info;
 460         struct kvm_msr_entry entries[100];
 461     } msr_data;
 462     struct kvm_msr_entry *msrs = msr_data.entries;
 463     int ret, i, n;
 464
 465     n = 0;
 466     msrs[n++].index = MSR_IA32_SYSENTER_CS;
 467     msrs[n++].index = MSR_IA32_SYSENTER_ESP;
 468     msrs[n++].index = MSR_IA32_SYSENTER_EIP;
 469     if (kvm_has_msr_star(env))
 470         msrs[n++].index = MSR_STAR;
 471     msrs[n++].index = MSR_IA32_TSC;
 472 #ifdef TARGET_X86_64
 473     /* FIXME lm_capable_kernel */
 474     msrs[n++].index = MSR_CSTAR;
 475     msrs[n++].index = MSR_KERNELGSBASE;
 476     msrs[n++].index = MSR_FMASK;
 477     msrs[n++].index = MSR_LSTAR;
 478 #endif
 479     msr_data.info.nmsrs = n;
 480     ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
 481     if (ret < 0)
 482         return ret;
 483
 484     for (i = 0; i < ret; i++) {
 485         switch (msrs[i].index) {
 486         case MSR_IA32_SYSENTER_CS:
 487             env->sysenter_cs = msrs[i].data;
 488             break;
 489         case MSR_IA32_SYSENTER_ESP:
 490             env->sysenter_esp = msrs[i].data;
 491             break;
 492         case MSR_IA32_SYSENTER_EIP:
 493             env->sysenter_eip = msrs[i].data;
 494             break;
 495         case MSR_STAR:
 496             env->star = msrs[i].data;
 497             break;
 498 #ifdef TARGET_X86_64
 499         case MSR_CSTAR:
 500             env->cstar = msrs[i].data;
 501             break;
 502         case MSR_KERNELGSBASE:
 503             env->kernelgsbase = msrs[i].data;
 504             break;
 505         case MSR_FMASK:
 506             env->fmask = msrs[i].data;
 507             break;
 508         case MSR_LSTAR:
 509             env->lstar = msrs[i].data;
 510             break;
 511 #endif
 512         case MSR_IA32_TSC:
 513             env->tsc = msrs[i].data;
 514             break;
 515         }
 516     }
 517
 518     return 0;
 519 }
 520
 521 int kvm_arch_put_registers(CPUState *env)
 522 {
 523     int ret;
 524
 525     ret = kvm_getput_regs(env, 1);
 526     if (ret < 0)
 527         return ret;
 528
 529     ret = kvm_put_fpu(env);
 530     if (ret < 0)
 531         return ret;
 532
 533     ret = kvm_put_sregs(env);
 534     if (ret < 0)
 535         return ret;
 536
 537     ret = kvm_put_msrs(env);
 538     if (ret < 0)
 539         return ret;
 540
 541     return 0;
 542 }
 543
 544 int kvm_arch_get_registers(CPUState *env)
 545 {
 546     int ret;
 547
 548     ret = kvm_getput_regs(env, 0);
 549     if (ret < 0)
 550         return ret;
 551
 552     ret = kvm_get_fpu(env);
 553     if (ret < 0)
 554         return ret;
 555
 556     ret = kvm_get_sregs(env);
 557     if (ret < 0)
 558         return ret;
 559
 560     ret = kvm_get_msrs(env);
 561     if (ret < 0)
 562         return ret;
 563
 564     return 0;
 565 }
 566
 567 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 568 {
 569     /* Try to inject an interrupt if the guest can accept it */
 570     if (run->ready_for_interrupt_injection &&
 571         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 572         (env->eflags & IF_MASK)) {
 573         int irq;
 574
 575         env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 576         irq = cpu_get_pic_interrupt(env);
 577         if (irq >= 0) {
 578             struct kvm_interrupt intr;
 579             intr.irq = irq;
 580             /* FIXME: errors */
 581             dprintf("injected interrupt %d\n", irq);
 582             kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
 583         }
 584     }
 585
 586     /* If we have an interrupt but the guest is not ready to receive an
 587      * interrupt, request an interrupt window exit.  This will
 588      * cause a return to userspace as soon as the guest is ready to
 589      * receive interrupts. */
 590     if ((env->interrupt_request & CPU_INTERRUPT_HARD))
 591         run->request_interrupt_window = 1;
 592     else
 593         run->request_interrupt_window = 0;
 594
 595     dprintf("setting tpr\n");
 596     run->cr8 = cpu_get_apic_tpr(env);
 597
 598     return 0;
 599 }
 600
 601 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 602 {
 603     if (run->if_flag)
 604         env->eflags |= IF_MASK;
 605     else
 606         env->eflags &= ~IF_MASK;
 607
 608     cpu_set_apic_tpr(env, run->cr8);
 609     cpu_set_apic_base(env, run->apic_base);
 610
 611     return 0;
 612 }
 613
 614 static int kvm_handle_halt(CPUState *env)
 615 {
 616     if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
 617           (env->eflags & IF_MASK)) &&
 618         !(env->interrupt_request & CPU_INTERRUPT_NMI)) {
 619         env->halted = 1;
 620         env->exception_index = EXCP_HLT;
 621         return 0;
 622     }
 623
 624     return 1;
 625 }
 626
 627 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 628 {
 629     int ret = 0;
 630
 631     switch (run->exit_reason) {
 632     case KVM_EXIT_HLT:
 633         dprintf("handle_hlt\n");
 634         ret = kvm_handle_halt(env);
 635         break;
 636     }
 637
 638     return ret;
 639 }