qemu-kvm-x86.c

   1 /*
   2  * qemu/kvm integration, x86 specific code
   3  *
   4  * Copyright (C) 2006-2008 Qumranet Technologies
   5  *
   6  * Licensed under the terms of the GNU GPL version 2 or higher.
   7  */
   8
   9 #include "config.h"
  10 #include "config-host.h"
  11
  12 #include <string.h>
  13 #include "hw/hw.h"
  14
  15 #include "qemu-kvm.h"
  16 #include <libkvm.h>
  17 #include <pthread.h>
  18 #include <sys/utsname.h>
  19 #include <linux/kvm_para.h>
  20
  21 #define MSR_IA32_TSC            0x10
  22
  23 static struct kvm_msr_list *kvm_msr_list;
  24 extern unsigned int kvm_shadow_memory;
  25 extern kvm_context_t kvm_context;
  26 static int kvm_has_msr_star;
  27
  28 static int lm_capable_kernel;
  29
  30 int kvm_arch_qemu_create_context(void)
  31 {
  32     int i;
  33     struct utsname utsname;
  34
  35     uname(&utsname);
  36     lm_capable_kernel = strcmp(utsname.machine, "x86_64") == 0;
  37
  38     if (kvm_shadow_memory)
  39         kvm_set_shadow_pages(kvm_context, kvm_shadow_memory);
  40
  41     kvm_msr_list = kvm_get_msr_list(kvm_context);
  42     if (!kvm_msr_list)
  43                 return -1;
  44     for (i = 0; i < kvm_msr_list->nmsrs; ++i)
  45         if (kvm_msr_list->indices[i] == MSR_STAR)
  46             kvm_has_msr_star = 1;
  47         return 0;
  48 }
  49
  50 static void set_msr_entry(struct kvm_msr_entry *entry, uint32_t index,
  51                           uint64_t data)
  52 {
  53     entry->index = index;
  54     entry->data  = data;
  55 }
  56
  57 /* returns 0 on success, non-0 on failure */
  58 static int get_msr_entry(struct kvm_msr_entry *entry, CPUState *env)
  59 {
  60         switch (entry->index) {
  61         case MSR_IA32_SYSENTER_CS:
  62             env->sysenter_cs  = entry->data;
  63             break;
  64         case MSR_IA32_SYSENTER_ESP:
  65             env->sysenter_esp = entry->data;
  66             break;
  67         case MSR_IA32_SYSENTER_EIP:
  68             env->sysenter_eip = entry->data;
  69             break;
  70         case MSR_STAR:
  71             env->star         = entry->data;
  72             break;
  73 #ifdef TARGET_X86_64
  74         case MSR_CSTAR:
  75             env->cstar        = entry->data;
  76             break;
  77         case MSR_KERNELGSBASE:
  78             env->kernelgsbase = entry->data;
  79             break;
  80         case MSR_FMASK:
  81             env->fmask        = entry->data;
  82             break;
  83         case MSR_LSTAR:
  84             env->lstar        = entry->data;
  85             break;
  86 #endif
  87         case MSR_IA32_TSC:
  88             env->tsc          = entry->data;
  89             break;
  90         default:
  91             printf("Warning unknown msr index 0x%x\n", entry->index);
  92             return 1;
  93         }
  94         return 0;
  95 }
  96
  97 #ifdef TARGET_X86_64
  98 #define MSR_COUNT 9
  99 #else
 100 #define MSR_COUNT 5
 101 #endif
 102
 103 static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 104 {
 105     lhs->selector = rhs->selector;
 106     lhs->base = rhs->base;
 107     lhs->limit = rhs->limit;
 108     lhs->type = 3;
 109     lhs->present = 1;
 110     lhs->dpl = 3;
 111     lhs->db = 0;
 112     lhs->s = 1;
 113     lhs->l = 0;
 114     lhs->g = 0;
 115     lhs->avl = 0;
 116     lhs->unusable = 0;
 117 }
 118
 119 static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 120 {
 121     unsigned flags = rhs->flags;
 122     lhs->selector = rhs->selector;
 123     lhs->base = rhs->base;
 124     lhs->limit = rhs->limit;
 125     lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
 126     lhs->present = (flags & DESC_P_MASK) != 0;
 127     lhs->dpl = rhs->selector & 3;
 128     lhs->db = (flags >> DESC_B_SHIFT) & 1;
 129     lhs->s = (flags & DESC_S_MASK) != 0;
 130     lhs->l = (flags >> DESC_L_SHIFT) & 1;
 131     lhs->g = (flags & DESC_G_MASK) != 0;
 132     lhs->avl = (flags & DESC_AVL_MASK) != 0;
 133     lhs->unusable = 0;
 134 }
 135
 136 static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
 137 {
 138     lhs->selector = rhs->selector;
 139     lhs->base = rhs->base;
 140     lhs->limit = rhs->limit;
 141     lhs->flags =
 142         (rhs->type << DESC_TYPE_SHIFT)
 143         | (rhs->present * DESC_P_MASK)
 144         | (rhs->dpl << DESC_DPL_SHIFT)
 145         | (rhs->db << DESC_B_SHIFT)
 146         | (rhs->s * DESC_S_MASK)
 147         | (rhs->l << DESC_L_SHIFT)
 148         | (rhs->g * DESC_G_MASK)
 149         | (rhs->avl * DESC_AVL_MASK);
 150 }
 151
 152 void kvm_arch_load_regs(CPUState *env)
 153 {
 154     struct kvm_regs regs;
 155     struct kvm_fpu fpu;
 156     struct kvm_sregs sregs;
 157     struct kvm_msr_entry msrs[MSR_COUNT];
 158     int rc, n, i;
 159
 160     regs.rax = env->regs[R_EAX];
 161     regs.rbx = env->regs[R_EBX];
 162     regs.rcx = env->regs[R_ECX];
 163     regs.rdx = env->regs[R_EDX];
 164     regs.rsi = env->regs[R_ESI];
 165     regs.rdi = env->regs[R_EDI];
 166     regs.rsp = env->regs[R_ESP];
 167     regs.rbp = env->regs[R_EBP];
 168 #ifdef TARGET_X86_64
 169     regs.r8 = env->regs[8];
 170     regs.r9 = env->regs[9];
 171     regs.r10 = env->regs[10];
 172     regs.r11 = env->regs[11];
 173     regs.r12 = env->regs[12];
 174     regs.r13 = env->regs[13];
 175     regs.r14 = env->regs[14];
 176     regs.r15 = env->regs[15];
 177 #endif
 178
 179     regs.rflags = env->eflags;
 180     regs.rip = env->eip;
 181
 182     kvm_set_regs(kvm_context, env->cpu_index, &regs);
 183
 184     memset(&fpu, 0, sizeof fpu);
 185     fpu.fsw = env->fpus & ~(7 << 11);
 186     fpu.fsw |= (env->fpstt & 7) << 11;
 187     fpu.fcw = env->fpuc;
 188     for (i = 0; i < 8; ++i)
 189         fpu.ftwx |= (!env->fptags[i]) << i;
 190     memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
 191     memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs);
 192     fpu.mxcsr = env->mxcsr;
 193     kvm_set_fpu(kvm_context, env->cpu_index, &fpu);
 194
 195     memcpy(sregs.interrupt_bitmap, env->kvm_interrupt_bitmap, sizeof(sregs.interrupt_bitmap));
 196
 197     if ((env->eflags & VM_MASK)) {
 198             set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
 199             set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
 200             set_v8086_seg(&sregs.es, &env->segs[R_ES]);
 201             set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
 202             set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
 203             set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
 204     } else {
 205             set_seg(&sregs.cs, &env->segs[R_CS]);
 206             set_seg(&sregs.ds, &env->segs[R_DS]);
 207             set_seg(&sregs.es, &env->segs[R_ES]);
 208             set_seg(&sregs.fs, &env->segs[R_FS]);
 209             set_seg(&sregs.gs, &env->segs[R_GS]);
 210             set_seg(&sregs.ss, &env->segs[R_SS]);
 211
 212             if (env->cr[0] & CR0_PE_MASK) {
 213                 /* force ss cpl to cs cpl */
 214                 sregs.ss.selector = (sregs.ss.selector & ~3) |
 215                         (sregs.cs.selector & 3);
 216                 sregs.ss.dpl = sregs.ss.selector & 3;
 217             }
 218     }
 219
 220     set_seg(&sregs.tr, &env->tr);
 221     set_seg(&sregs.ldt, &env->ldt);
 222
 223     sregs.idt.limit = env->idt.limit;
 224     sregs.idt.base = env->idt.base;
 225     sregs.gdt.limit = env->gdt.limit;
 226     sregs.gdt.base = env->gdt.base;
 227
 228     sregs.cr0 = env->cr[0];
 229     sregs.cr2 = env->cr[2];
 230     sregs.cr3 = env->cr[3];
 231     sregs.cr4 = env->cr[4];
 232
 233     sregs.cr8 = cpu_get_apic_tpr(env);
 234     sregs.apic_base = cpu_get_apic_base(env);
 235
 236     sregs.efer = env->efer;
 237
 238     kvm_set_sregs(kvm_context, env->cpu_index, &sregs);
 239
 240     /* msrs */
 241     n = 0;
 242     set_msr_entry(&msrs[n++], MSR_IA32_SYSENTER_CS,  env->sysenter_cs);
 243     set_msr_entry(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
 244     set_msr_entry(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
 245     if (kvm_has_msr_star)
 246         set_msr_entry(&msrs[n++], MSR_STAR,              env->star);
 247     set_msr_entry(&msrs[n++], MSR_IA32_TSC, env->tsc);
 248 #ifdef TARGET_X86_64
 249     if (lm_capable_kernel) {
 250         set_msr_entry(&msrs[n++], MSR_CSTAR,             env->cstar);
 251         set_msr_entry(&msrs[n++], MSR_KERNELGSBASE,      env->kernelgsbase);
 252         set_msr_entry(&msrs[n++], MSR_FMASK,             env->fmask);
 253         set_msr_entry(&msrs[n++], MSR_LSTAR  ,           env->lstar);
 254     }
 255 #endif
 256
 257     rc = kvm_set_msrs(kvm_context, env->cpu_index, msrs, n);
 258     if (rc == -1)
 259         perror("kvm_set_msrs FAILED");
 260 }
 261
 262 void kvm_save_mpstate(CPUState *env)
 263 {
 264 #ifdef KVM_CAP_MP_STATE
 265     int r;
 266     struct kvm_mp_state mp_state;
 267
 268     r = kvm_get_mpstate(kvm_context, env->cpu_index, &mp_state);
 269     if (r < 0)
 270         env->mp_state = -1;
 271     else
 272         env->mp_state = mp_state.mp_state;
 273 #endif
 274 }
 275
 276 void kvm_load_mpstate(CPUState *env)
 277 {
 278 #ifdef KVM_CAP_MP_STATE
 279     struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
 280
 281     /*
 282      * -1 indicates that the host did not support GET_MP_STATE ioctl,
 283      *  so don't touch it.
 284      */
 285     if (env->mp_state != -1)
 286         kvm_set_mpstate(kvm_context, env->cpu_index, &mp_state);
 287 #endif
 288 }
 289
 290 void kvm_arch_save_regs(CPUState *env)
 291 {
 292     struct kvm_regs regs;
 293     struct kvm_fpu fpu;
 294     struct kvm_sregs sregs;
 295     struct kvm_msr_entry msrs[MSR_COUNT];
 296     uint32_t hflags;
 297     uint32_t i, n, rc;
 298
 299     kvm_get_regs(kvm_context, env->cpu_index, &regs);
 300
 301     env->regs[R_EAX] = regs.rax;
 302     env->regs[R_EBX] = regs.rbx;
 303     env->regs[R_ECX] = regs.rcx;
 304     env->regs[R_EDX] = regs.rdx;
 305     env->regs[R_ESI] = regs.rsi;
 306     env->regs[R_EDI] = regs.rdi;
 307     env->regs[R_ESP] = regs.rsp;
 308     env->regs[R_EBP] = regs.rbp;
 309 #ifdef TARGET_X86_64
 310     env->regs[8] = regs.r8;
 311     env->regs[9] = regs.r9;
 312     env->regs[10] = regs.r10;
 313     env->regs[11] = regs.r11;
 314     env->regs[12] = regs.r12;
 315     env->regs[13] = regs.r13;
 316     env->regs[14] = regs.r14;
 317     env->regs[15] = regs.r15;
 318 #endif
 319
 320     env->eflags = regs.rflags;
 321     env->eip = regs.rip;
 322
 323     kvm_get_fpu(kvm_context, env->cpu_index, &fpu);
 324     env->fpstt = (fpu.fsw >> 11) & 7;
 325     env->fpus = fpu.fsw;
 326     env->fpuc = fpu.fcw;
 327     for (i = 0; i < 8; ++i)
 328         env->fptags[i] = !((fpu.ftwx >> i) & 1);
 329     memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
 330     memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
 331     env->mxcsr = fpu.mxcsr;
 332
 333     kvm_get_sregs(kvm_context, env->cpu_index, &sregs);
 334
 335     memcpy(env->kvm_interrupt_bitmap, sregs.interrupt_bitmap, sizeof(env->kvm_interrupt_bitmap));
 336
 337     get_seg(&env->segs[R_CS], &sregs.cs);
 338     get_seg(&env->segs[R_DS], &sregs.ds);
 339     get_seg(&env->segs[R_ES], &sregs.es);
 340     get_seg(&env->segs[R_FS], &sregs.fs);
 341     get_seg(&env->segs[R_GS], &sregs.gs);
 342     get_seg(&env->segs[R_SS], &sregs.ss);
 343
 344     get_seg(&env->tr, &sregs.tr);
 345     get_seg(&env->ldt, &sregs.ldt);
 346
 347     env->idt.limit = sregs.idt.limit;
 348     env->idt.base = sregs.idt.base;
 349     env->gdt.limit = sregs.gdt.limit;
 350     env->gdt.base = sregs.gdt.base;
 351
 352     env->cr[0] = sregs.cr0;
 353     env->cr[2] = sregs.cr2;
 354     env->cr[3] = sregs.cr3;
 355     env->cr[4] = sregs.cr4;
 356
 357     cpu_set_apic_base(env, sregs.apic_base);
 358
 359     env->efer = sregs.efer;
 360     //cpu_set_apic_tpr(env, sregs.cr8);
 361
 362 #define HFLAG_COPY_MASK ~( \
 363                         HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
 364                         HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
 365                         HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
 366                         HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
 367
 368
 369
 370     hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
 371     hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
 372     hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
 373             (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
 374     hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
 375     hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
 376             (HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
 377
 378     if (env->efer & MSR_EFER_LMA) {
 379         hflags |= HF_LMA_MASK;
 380     }
 381
 382     if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
 383         hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
 384     } else {
 385         hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
 386                 (DESC_B_SHIFT - HF_CS32_SHIFT);
 387         hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
 388                 (DESC_B_SHIFT - HF_SS32_SHIFT);
 389         if (!(env->cr[0] & CR0_PE_MASK) ||
 390                    (env->eflags & VM_MASK) ||
 391                    !(hflags & HF_CS32_MASK)) {
 392                 hflags |= HF_ADDSEG_MASK;
 393             } else {
 394                 hflags |= ((env->segs[R_DS].base |
 395                                 env->segs[R_ES].base |
 396                                 env->segs[R_SS].base) != 0) <<
 397                     HF_ADDSEG_SHIFT;
 398             }
 399     }
 400     env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
 401     env->cc_src = env->eflags & (CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
 402     env->df = 1 - (2 * ((env->eflags >> 10) & 1));
 403     env->cc_op = CC_OP_EFLAGS;
 404     env->eflags &= ~(DF_MASK | CC_O | CC_S | CC_Z | CC_A | CC_P | CC_C);
 405
 406     /* msrs */
 407     n = 0;
 408     msrs[n++].index = MSR_IA32_SYSENTER_CS;
 409     msrs[n++].index = MSR_IA32_SYSENTER_ESP;
 410     msrs[n++].index = MSR_IA32_SYSENTER_EIP;
 411     if (kvm_has_msr_star)
 412         msrs[n++].index = MSR_STAR;
 413     msrs[n++].index = MSR_IA32_TSC;
 414 #ifdef TARGET_X86_64
 415     if (lm_capable_kernel) {
 416         msrs[n++].index = MSR_CSTAR;
 417         msrs[n++].index = MSR_KERNELGSBASE;
 418         msrs[n++].index = MSR_FMASK;
 419         msrs[n++].index = MSR_LSTAR;
 420     }
 421 #endif
 422     rc = kvm_get_msrs(kvm_context, env->cpu_index, msrs, n);
 423     if (rc == -1) {
 424         perror("kvm_get_msrs FAILED");
 425     }
 426     else {
 427         n = rc; /* actual number of MSRs */
 428         for (i=0 ; i<n; i++) {
 429             if (get_msr_entry(&msrs[i], env))
 430                 return;
 431         }
 432     }
 433 }
 434
 435 static void host_cpuid(uint32_t function, uint32_t *eax, uint32_t *ebx,
 436                        uint32_t *ecx, uint32_t *edx)
 437 {
 438     uint32_t vec[4];
 439
 440 #ifdef __x86_64__
 441     asm volatile("cpuid"
 442                  : "=a"(vec[0]), "=b"(vec[1]),
 443                    "=c"(vec[2]), "=d"(vec[3])
 444                  : "0"(function) : "cc");
 445 #else
 446     asm volatile("pusha \n\t"
 447                  "cpuid \n\t"
 448                  "mov %%eax, 0(%1) \n\t"
 449                  "mov %%ebx, 4(%1) \n\t"
 450                  "mov %%ecx, 8(%1) \n\t"
 451                  "mov %%edx, 12(%1) \n\t"
 452                  "popa"
 453                  : : "a"(function), "S"(vec)
 454                  : "memory", "cc");
 455 #endif
 456
 457     if (eax)
 458         *eax = vec[0];
 459     if (ebx)
 460         *ebx = vec[1];
 461     if (ecx)
 462         *ecx = vec[2];
 463     if (edx)
 464         *edx = vec[3];
 465 }
 466
 467
 468 static void do_cpuid_ent(struct kvm_cpuid_entry *e, uint32_t function,
 469                          CPUState *env)
 470 {
 471     env->regs[R_EAX] = function;
 472     qemu_kvm_cpuid_on_env(env);
 473     e->function = function;
 474     e->eax = env->regs[R_EAX];
 475     e->ebx = env->regs[R_EBX];
 476     e->ecx = env->regs[R_ECX];
 477     e->edx = env->regs[R_EDX];
 478     if (function == 0x80000001) {
 479         uint32_t h_eax, h_edx;
 480
 481         host_cpuid(function, &h_eax, NULL, NULL, &h_edx);
 482
 483         // long mode
 484         if ((h_edx & 0x20000000) == 0 || !lm_capable_kernel)
 485             e->edx &= ~0x20000000u;
 486         // syscall
 487         if ((h_edx & 0x00000800) == 0)
 488             e->edx &= ~0x00000800u;
 489         // nx
 490         if ((h_edx & 0x00100000) == 0)
 491             e->edx &= ~0x00100000u;
 492         // svm
 493         if (e->ecx & 4)
 494             e->ecx &= ~4u;
 495     }
 496     // sysenter isn't supported on compatibility mode on AMD.  and syscall
 497     // isn't supported in compatibility mode on Intel.  so advertise the
 498     // actuall cpu, and say goodbye to migration between different vendors
 499     // is you use compatibility mode.
 500     if (function == 0) {
 501         uint32_t bcd[3];
 502
 503         host_cpuid(0, NULL, &bcd[0], &bcd[1], &bcd[2]);
 504         e->ebx = bcd[0];
 505         e->ecx = bcd[1];
 506         e->edx = bcd[2];
 507     }
 508     // "Hypervisor present" bit for Microsoft guests
 509     if (function == 1)
 510         e->ecx |= (1u << 31);
 511
 512     // 3dnow isn't properly emulated yet
 513     if (function == 0x80000001)
 514         e->edx &= ~0xc0000000;
 515 }
 516
 517 struct kvm_para_features {
 518         int cap;
 519         int feature;
 520 } para_features[] = {
 521 #ifdef KVM_CAP_CLOCKSOURCE
 522         { KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE },
 523 #endif
 524 #ifdef KVM_CAP_NOP_IO_DELAY
 525         { KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
 526 #endif
 527 #ifdef KVM_CAP_PV_MMU
 528         { KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
 529 #endif
 530 #ifdef KVM_CAP_CR3_CACHE
 531         { KVM_CAP_CR3_CACHE, KVM_FEATURE_CR3_CACHE },
 532 #endif
 533         { -1, -1 }
 534 };
 535
 536 static int get_para_features(kvm_context_t kvm_context)
 537 {
 538         int i, features = 0;
 539
 540         for (i = 0; i < ARRAY_SIZE(para_features)-1; i++) {
 541                 if (kvm_check_extension(kvm_context, para_features[i].cap))
 542                         features |= (1 << para_features[i].feature);
 543         }
 544
 545         return features;
 546 }
 547
 548 int kvm_arch_qemu_init_env(CPUState *cenv)
 549 {
 550     struct kvm_cpuid_entry cpuid_ent[100];
 551 #ifdef KVM_CPUID_SIGNATURE
 552     struct kvm_cpuid_entry *pv_ent;
 553     uint32_t signature[3];
 554 #endif
 555     int cpuid_nent = 0;
 556     CPUState copy;
 557     uint32_t i, limit;
 558
 559     copy = *cenv;
 560
 561 #ifdef KVM_CPUID_SIGNATURE
 562     /* Paravirtualization CPUIDs */
 563     memcpy(signature, "KVMKVMKVM", 12);
 564     pv_ent = &cpuid_ent[cpuid_nent++];
 565     memset(pv_ent, 0, sizeof(*pv_ent));
 566     pv_ent->function = KVM_CPUID_SIGNATURE;
 567     pv_ent->eax = 0;
 568     pv_ent->ebx = signature[0];
 569     pv_ent->ecx = signature[1];
 570     pv_ent->edx = signature[2];
 571
 572     pv_ent = &cpuid_ent[cpuid_nent++];
 573     memset(pv_ent, 0, sizeof(*pv_ent));
 574     pv_ent->function = KVM_CPUID_FEATURES;
 575     pv_ent->eax = get_para_features(kvm_context);
 576 #endif
 577
 578     copy.regs[R_EAX] = 0;
 579     qemu_kvm_cpuid_on_env(&copy);
 580     limit = copy.regs[R_EAX];
 581
 582     for (i = 0; i <= limit; ++i)
 583         do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, &copy);
 584
 585     copy.regs[R_EAX] = 0x80000000;
 586     qemu_kvm_cpuid_on_env(&copy);
 587     limit = copy.regs[R_EAX];
 588
 589     for (i = 0x80000000; i <= limit; ++i)
 590         do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, &copy);
 591
 592     kvm_setup_cpuid(kvm_context, cenv->cpu_index, cpuid_nent, cpuid_ent);
 593     return 0;
 594 }
 595
 596 int kvm_arch_halt(void *opaque, int vcpu)
 597 {
 598     CPUState *env = cpu_single_env;
 599
 600     if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
 601           (env->eflags & IF_MASK))) {
 602             env->halted = 1;
 603             env->exception_index = EXCP_HLT;
 604     }
 605     return 1;
 606 }
 607
 608 void kvm_arch_pre_kvm_run(void *opaque, int vcpu)
 609 {
 610     CPUState *env = cpu_single_env;
 611
 612     if (!kvm_irqchip_in_kernel(kvm_context))
 613         kvm_set_cr8(kvm_context, vcpu, cpu_get_apic_tpr(env));
 614 }
 615
 616 void kvm_arch_post_kvm_run(void *opaque, int vcpu)
 617 {
 618     CPUState *env = qemu_kvm_cpu_env(vcpu);
 619     cpu_single_env = env;
 620
 621     env->eflags = kvm_get_interrupt_flag(kvm_context, vcpu)
 622         ? env->eflags | IF_MASK : env->eflags & ~IF_MASK;
 623
 624     cpu_set_apic_tpr(env, kvm_get_cr8(kvm_context, vcpu));
 625     cpu_set_apic_base(env, kvm_get_apic_base(kvm_context, vcpu));
 626 }
 627
 628 int kvm_arch_has_work(CPUState *env)
 629 {
 630     if ((env->interrupt_request & (CPU_INTERRUPT_HARD | CPU_INTERRUPT_EXIT)) &&
 631         (env->eflags & IF_MASK))
 632         return 1;
 633     return 0;
 634 }
 635
 636 int kvm_arch_try_push_interrupts(void *opaque)
 637 {
 638     CPUState *env = cpu_single_env;
 639     int r, irq;
 640
 641     if (kvm_is_ready_for_interrupt_injection(kvm_context, env->cpu_index) &&
 642         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 643         (env->eflags & IF_MASK)) {
 644             env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 645             irq = cpu_get_pic_interrupt(env);
 646             if (irq >= 0) {
 647                 r = kvm_inject_irq(kvm_context, env->cpu_index, irq);
 648                 if (r < 0)
 649                     printf("cpu %d fail inject %x\n", env->cpu_index, irq);
 650             }
 651     }
 652
 653     return (env->interrupt_request & CPU_INTERRUPT_HARD) != 0;
 654 }
 655
 656 void kvm_arch_update_regs_for_sipi(CPUState *env)
 657 {
 658     SegmentCache cs = env->segs[R_CS];
 659
 660     kvm_arch_save_regs(env);
 661     env->segs[R_CS] = cs;
 662     env->eip = 0;
 663     kvm_arch_load_regs(env);
 664 }
 665
 666 int handle_tpr_access(void *opaque, int vcpu,
 667                              uint64_t rip, int is_write)
 668 {
 669     kvm_tpr_access_report(cpu_single_env, rip, is_write);
 670     return 0;
 671 }
 672
 673 void kvm_arch_cpu_reset(CPUState *env)
 674 {
 675     kvm_arch_load_regs(env);
 676     if (env->cpu_index != 0) {
 677         if (kvm_irqchip_in_kernel(kvm_context)) {
 678 #ifdef KVM_CAP_MP_STATE
 679             kvm_reset_mpstate(kvm_context, env->cpu_index);
 680 #endif
 681         } else {
 682             env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 683             env->halted = 1;
 684             env->exception_index = EXCP_HLT;
 685         }
 686     }
 687 }