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 #include "gdbstub.h"
  26 #include "host-utils.h"
  27
  28 //#define DEBUG_KVM
  29
  30 #ifdef DEBUG_KVM
  31 #define dprintf(fmt, ...) \
  32     do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
  33 #else
  34 #define dprintf(fmt, ...) \
  35     do { } while (0)
  36 #endif
  37
  38 #ifdef KVM_CAP_EXT_CPUID
  39
  40 static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
  41 {
  42     struct kvm_cpuid2 *cpuid;
  43     int r, size;
  44
  45     size = sizeof(*cpuid) + max * sizeof(*cpuid->entries);
  46     cpuid = (struct kvm_cpuid2 *)qemu_mallocz(size);
  47     cpuid->nent = max;
  48     r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid);
  49     if (r == 0 && cpuid->nent >= max) {
  50         r = -E2BIG;
  51     }
  52     if (r < 0) {
  53         if (r == -E2BIG) {
  54             qemu_free(cpuid);
  55             return NULL;
  56         } else {
  57             fprintf(stderr, "KVM_GET_SUPPORTED_CPUID failed: %s\n",
  58                     strerror(-r));
  59             exit(1);
  60         }
  61     }
  62     return cpuid;
  63 }
  64
  65 uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
  66 {
  67     struct kvm_cpuid2 *cpuid;
  68     int i, max;
  69     uint32_t ret = 0;
  70     uint32_t cpuid_1_edx;
  71
  72     if (!kvm_check_extension(env->kvm_state, KVM_CAP_EXT_CPUID)) {
  73         return -1U;
  74     }
  75
  76     max = 1;
  77     while ((cpuid = try_get_cpuid(env->kvm_state, max)) == NULL) {
  78         max *= 2;
  79     }
  80
  81     for (i = 0; i < cpuid->nent; ++i) {
  82         if (cpuid->entries[i].function == function) {
  83             switch (reg) {
  84             case R_EAX:
  85                 ret = cpuid->entries[i].eax;
  86                 break;
  87             case R_EBX:
  88                 ret = cpuid->entries[i].ebx;
  89                 break;
  90             case R_ECX:
  91                 ret = cpuid->entries[i].ecx;
  92                 break;
  93             case R_EDX:
  94                 ret = cpuid->entries[i].edx;
  95                 if (function == 0x80000001) {
  96                     /* On Intel, kvm returns cpuid according to the Intel spec,
  97                      * so add missing bits according to the AMD spec:
  98                      */
  99                     cpuid_1_edx = kvm_arch_get_supported_cpuid(env, 1, R_EDX);
 100                     ret |= cpuid_1_edx & 0xdfeff7ff;
 101                 }
 102                 break;
 103             }
 104         }
 105     }
 106
 107     qemu_free(cpuid);
 108
 109     return ret;
 110 }
 111
 112 #else
 113
 114 uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
 115 {
 116     return -1U;
 117 }
 118
 119 #endif
 120
 121 static void kvm_trim_features(uint32_t *features, uint32_t supported)
 122 {
 123     int i;
 124     uint32_t mask;
 125
 126     for (i = 0; i < 32; ++i) {
 127         mask = 1U << i;
 128         if ((*features & mask) && !(supported & mask)) {
 129             *features &= ~mask;
 130         }
 131     }
 132 }
 133
 134 int kvm_arch_init_vcpu(CPUState *env)
 135 {
 136     struct {
 137         struct kvm_cpuid2 cpuid;
 138         struct kvm_cpuid_entry2 entries[100];
 139     } __attribute__((packed)) cpuid_data;
 140     uint32_t limit, i, j, cpuid_i;
 141     uint32_t unused;
 142
 143     env->mp_state = KVM_MP_STATE_RUNNABLE;
 144
 145     kvm_trim_features(&env->cpuid_features,
 146         kvm_arch_get_supported_cpuid(env, 1, R_EDX));
 147
 148     i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR;
 149     kvm_trim_features(&env->cpuid_ext_features,
 150         kvm_arch_get_supported_cpuid(env, 1, R_ECX));
 151     env->cpuid_ext_features |= i;
 152
 153     kvm_trim_features(&env->cpuid_ext2_features,
 154         kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX));
 155     kvm_trim_features(&env->cpuid_ext3_features,
 156         kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX));
 157
 158     cpuid_i = 0;
 159
 160     cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);
 161
 162     for (i = 0; i <= limit; i++) {
 163         struct kvm_cpuid_entry2 *c = &cpuid_data.entries[cpuid_i++];
 164
 165         switch (i) {
 166         case 2: {
 167             /* Keep reading function 2 till all the input is received */
 168             int times;
 169
 170             c->function = i;
 171             c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC |
 172                        KVM_CPUID_FLAG_STATE_READ_NEXT;
 173             cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 174             times = c->eax & 0xff;
 175
 176             for (j = 1; j < times; ++j) {
 177                 c = &cpuid_data.entries[cpuid_i++];
 178                 c->function = i;
 179                 c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC;
 180                 cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 181             }
 182             break;
 183         }
 184         case 4:
 185         case 0xb:
 186         case 0xd:
 187             for (j = 0; ; j++) {
 188                 c->function = i;
 189                 c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
 190                 c->index = j;
 191                 cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->edx);
 192
 193                 if (i == 4 && c->eax == 0)
 194                     break;
 195                 if (i == 0xb && !(c->ecx & 0xff00))
 196                     break;
 197                 if (i == 0xd && c->eax == 0)
 198                     break;
 199
 200                 c = &cpuid_data.entries[cpuid_i++];
 201             }
 202             break;
 203         default:
 204             c->function = i;
 205             c->flags = 0;
 206             cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 207             break;
 208         }
 209     }
 210     cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused);
 211
 212     for (i = 0x80000000; i <= limit; i++) {
 213         struct kvm_cpuid_entry2 *c = &cpuid_data.entries[cpuid_i++];
 214
 215         c->function = i;
 216         c->flags = 0;
 217         cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
 218     }
 219
 220     cpuid_data.cpuid.nent = cpuid_i;
 221
 222     return kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data);
 223 }
 224
 225 void kvm_arch_reset_vcpu(CPUState *env)
 226 {
 227     env->interrupt_injected = -1;
 228 }
 229
 230 static int kvm_has_msr_star(CPUState *env)
 231 {
 232     static int has_msr_star;
 233     int ret;
 234
 235     /* first time */
 236     if (has_msr_star == 0) {
 237         struct kvm_msr_list msr_list, *kvm_msr_list;
 238
 239         has_msr_star = -1;
 240
 241         /* Obtain MSR list from KVM.  These are the MSRs that we must
 242          * save/restore */
 243         msr_list.nmsrs = 0;
 244         ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list);
 245         if (ret < 0)
 246             return 0;
 247
 248         /* Old kernel modules had a bug and could write beyond the provided
 249            memory. Allocate at least a safe amount of 1K. */
 250         kvm_msr_list = qemu_mallocz(MAX(1024, sizeof(msr_list) +
 251                                               msr_list.nmsrs *
 252                                               sizeof(msr_list.indices[0])));
 253
 254         kvm_msr_list->nmsrs = msr_list.nmsrs;
 255         ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
 256         if (ret >= 0) {
 257             int i;
 258
 259             for (i = 0; i < kvm_msr_list->nmsrs; i++) {
 260                 if (kvm_msr_list->indices[i] == MSR_STAR) {
 261                     has_msr_star = 1;
 262                     break;
 263                 }
 264             }
 265         }
 266
 267         free(kvm_msr_list);
 268     }
 269
 270     if (has_msr_star == 1)
 271         return 1;
 272     return 0;
 273 }
 274
 275 int kvm_arch_init(KVMState *s, int smp_cpus)
 276 {
 277     int ret;
 278
 279     /* create vm86 tss.  KVM uses vm86 mode to emulate 16-bit code
 280      * directly.  In order to use vm86 mode, a TSS is needed.  Since this
 281      * must be part of guest physical memory, we need to allocate it.  Older
 282      * versions of KVM just assumed that it would be at the end of physical
 283      * memory but that doesn't work with more than 4GB of memory.  We simply
 284      * refuse to work with those older versions of KVM. */
 285     ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR);
 286     if (ret <= 0) {
 287         fprintf(stderr, "kvm does not support KVM_CAP_SET_TSS_ADDR\n");
 288         return ret;
 289     }
 290
 291     /* this address is 3 pages before the bios, and the bios should present
 292      * as unavaible memory.  FIXME, need to ensure the e820 map deals with
 293      * this?
 294      */
 295     return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000);
 296 }
 297
 298 static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 299 {
 300     lhs->selector = rhs->selector;
 301     lhs->base = rhs->base;
 302     lhs->limit = rhs->limit;
 303     lhs->type = 3;
 304     lhs->present = 1;
 305     lhs->dpl = 3;
 306     lhs->db = 0;
 307     lhs->s = 1;
 308     lhs->l = 0;
 309     lhs->g = 0;
 310     lhs->avl = 0;
 311     lhs->unusable = 0;
 312 }
 313
 314 static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
 315 {
 316     unsigned flags = rhs->flags;
 317     lhs->selector = rhs->selector;
 318     lhs->base = rhs->base;
 319     lhs->limit = rhs->limit;
 320     lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
 321     lhs->present = (flags & DESC_P_MASK) != 0;
 322     lhs->dpl = rhs->selector & 3;
 323     lhs->db = (flags >> DESC_B_SHIFT) & 1;
 324     lhs->s = (flags & DESC_S_MASK) != 0;
 325     lhs->l = (flags >> DESC_L_SHIFT) & 1;
 326     lhs->g = (flags & DESC_G_MASK) != 0;
 327     lhs->avl = (flags & DESC_AVL_MASK) != 0;
 328     lhs->unusable = 0;
 329 }
 330
 331 static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
 332 {
 333     lhs->selector = rhs->selector;
 334     lhs->base = rhs->base;
 335     lhs->limit = rhs->limit;
 336     lhs->flags =
 337         (rhs->type << DESC_TYPE_SHIFT)
 338         | (rhs->present * DESC_P_MASK)
 339         | (rhs->dpl << DESC_DPL_SHIFT)
 340         | (rhs->db << DESC_B_SHIFT)
 341         | (rhs->s * DESC_S_MASK)
 342         | (rhs->l << DESC_L_SHIFT)
 343         | (rhs->g * DESC_G_MASK)
 344         | (rhs->avl * DESC_AVL_MASK);
 345 }
 346
 347 static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set)
 348 {
 349     if (set)
 350         *kvm_reg = *qemu_reg;
 351     else
 352         *qemu_reg = *kvm_reg;
 353 }
 354
 355 static int kvm_getput_regs(CPUState *env, int set)
 356 {
 357     struct kvm_regs regs;
 358     int ret = 0;
 359
 360     if (!set) {
 361         ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
 362         if (ret < 0)
 363             return ret;
 364     }
 365
 366     kvm_getput_reg(&regs.rax, &env->regs[R_EAX], set);
 367     kvm_getput_reg(&regs.rbx, &env->regs[R_EBX], set);
 368     kvm_getput_reg(&regs.rcx, &env->regs[R_ECX], set);
 369     kvm_getput_reg(&regs.rdx, &env->regs[R_EDX], set);
 370     kvm_getput_reg(&regs.rsi, &env->regs[R_ESI], set);
 371     kvm_getput_reg(&regs.rdi, &env->regs[R_EDI], set);
 372     kvm_getput_reg(&regs.rsp, &env->regs[R_ESP], set);
 373     kvm_getput_reg(&regs.rbp, &env->regs[R_EBP], set);
 374 #ifdef TARGET_X86_64
 375     kvm_getput_reg(&regs.r8, &env->regs[8], set);
 376     kvm_getput_reg(&regs.r9, &env->regs[9], set);
 377     kvm_getput_reg(&regs.r10, &env->regs[10], set);
 378     kvm_getput_reg(&regs.r11, &env->regs[11], set);
 379     kvm_getput_reg(&regs.r12, &env->regs[12], set);
 380     kvm_getput_reg(&regs.r13, &env->regs[13], set);
 381     kvm_getput_reg(&regs.r14, &env->regs[14], set);
 382     kvm_getput_reg(&regs.r15, &env->regs[15], set);
 383 #endif
 384
 385     kvm_getput_reg(&regs.rflags, &env->eflags, set);
 386     kvm_getput_reg(&regs.rip, &env->eip, set);
 387
 388     if (set)
 389         ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
 390
 391     return ret;
 392 }
 393
 394 static int kvm_put_fpu(CPUState *env)
 395 {
 396     struct kvm_fpu fpu;
 397     int i;
 398
 399     memset(&fpu, 0, sizeof fpu);
 400     fpu.fsw = env->fpus & ~(7 << 11);
 401     fpu.fsw |= (env->fpstt & 7) << 11;
 402     fpu.fcw = env->fpuc;
 403     for (i = 0; i < 8; ++i)
 404         fpu.ftwx |= (!env->fptags[i]) << i;
 405     memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
 406     memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs);
 407     fpu.mxcsr = env->mxcsr;
 408
 409     return kvm_vcpu_ioctl(env, KVM_SET_FPU, &fpu);
 410 }
 411
 412 static int kvm_put_sregs(CPUState *env)
 413 {
 414     struct kvm_sregs sregs;
 415
 416     memset(sregs.interrupt_bitmap, 0, sizeof(sregs.interrupt_bitmap));
 417     if (env->interrupt_injected >= 0) {
 418         sregs.interrupt_bitmap[env->interrupt_injected / 64] |=
 419                 (uint64_t)1 << (env->interrupt_injected % 64);
 420     }
 421
 422     if ((env->eflags & VM_MASK)) {
 423             set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
 424             set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
 425             set_v8086_seg(&sregs.es, &env->segs[R_ES]);
 426             set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
 427             set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
 428             set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
 429     } else {
 430             set_seg(&sregs.cs, &env->segs[R_CS]);
 431             set_seg(&sregs.ds, &env->segs[R_DS]);
 432             set_seg(&sregs.es, &env->segs[R_ES]);
 433             set_seg(&sregs.fs, &env->segs[R_FS]);
 434             set_seg(&sregs.gs, &env->segs[R_GS]);
 435             set_seg(&sregs.ss, &env->segs[R_SS]);
 436
 437             if (env->cr[0] & CR0_PE_MASK) {
 438                 /* force ss cpl to cs cpl */
 439                 sregs.ss.selector = (sregs.ss.selector & ~3) |
 440                         (sregs.cs.selector & 3);
 441                 sregs.ss.dpl = sregs.ss.selector & 3;
 442             }
 443     }
 444
 445     set_seg(&sregs.tr, &env->tr);
 446     set_seg(&sregs.ldt, &env->ldt);
 447
 448     sregs.idt.limit = env->idt.limit;
 449     sregs.idt.base = env->idt.base;
 450     sregs.gdt.limit = env->gdt.limit;
 451     sregs.gdt.base = env->gdt.base;
 452
 453     sregs.cr0 = env->cr[0];
 454     sregs.cr2 = env->cr[2];
 455     sregs.cr3 = env->cr[3];
 456     sregs.cr4 = env->cr[4];
 457
 458     sregs.cr8 = cpu_get_apic_tpr(env);
 459     sregs.apic_base = cpu_get_apic_base(env);
 460
 461     sregs.efer = env->efer;
 462
 463     return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
 464 }
 465
 466 static void kvm_msr_entry_set(struct kvm_msr_entry *entry,
 467                               uint32_t index, uint64_t value)
 468 {
 469     entry->index = index;
 470     entry->data = value;
 471 }
 472
 473 static int kvm_put_msrs(CPUState *env)
 474 {
 475     struct {
 476         struct kvm_msrs info;
 477         struct kvm_msr_entry entries[100];
 478     } msr_data;
 479     struct kvm_msr_entry *msrs = msr_data.entries;
 480     int n = 0;
 481
 482     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
 483     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
 484     kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
 485     if (kvm_has_msr_star(env))
 486         kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star);
 487     kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
 488 #ifdef TARGET_X86_64
 489     /* FIXME if lm capable */
 490     kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
 491     kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
 492     kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
 493     kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
 494 #endif
 495     msr_data.info.nmsrs = n;
 496
 497     return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data);
 498
 499 }
 500
 501
 502 static int kvm_get_fpu(CPUState *env)
 503 {
 504     struct kvm_fpu fpu;
 505     int i, ret;
 506
 507     ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu);
 508     if (ret < 0)
 509         return ret;
 510
 511     env->fpstt = (fpu.fsw >> 11) & 7;
 512     env->fpus = fpu.fsw;
 513     env->fpuc = fpu.fcw;
 514     for (i = 0; i < 8; ++i)
 515         env->fptags[i] = !((fpu.ftwx >> i) & 1);
 516     memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
 517     memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
 518     env->mxcsr = fpu.mxcsr;
 519
 520     return 0;
 521 }
 522
 523 static int kvm_get_sregs(CPUState *env)
 524 {
 525     struct kvm_sregs sregs;
 526     uint32_t hflags;
 527     int bit, i, ret;
 528
 529     ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
 530     if (ret < 0)
 531         return ret;
 532
 533     /* There can only be one pending IRQ set in the bitmap at a time, so try
 534        to find it and save its number instead (-1 for none). */
 535     env->interrupt_injected = -1;
 536     for (i = 0; i < ARRAY_SIZE(sregs.interrupt_bitmap); i++) {
 537         if (sregs.interrupt_bitmap[i]) {
 538             bit = ctz64(sregs.interrupt_bitmap[i]);
 539             env->interrupt_injected = i * 64 + bit;
 540             break;
 541         }
 542     }
 543
 544     get_seg(&env->segs[R_CS], &sregs.cs);
 545     get_seg(&env->segs[R_DS], &sregs.ds);
 546     get_seg(&env->segs[R_ES], &sregs.es);
 547     get_seg(&env->segs[R_FS], &sregs.fs);
 548     get_seg(&env->segs[R_GS], &sregs.gs);
 549     get_seg(&env->segs[R_SS], &sregs.ss);
 550
 551     get_seg(&env->tr, &sregs.tr);
 552     get_seg(&env->ldt, &sregs.ldt);
 553
 554     env->idt.limit = sregs.idt.limit;
 555     env->idt.base = sregs.idt.base;
 556     env->gdt.limit = sregs.gdt.limit;
 557     env->gdt.base = sregs.gdt.base;
 558
 559     env->cr[0] = sregs.cr0;
 560     env->cr[2] = sregs.cr2;
 561     env->cr[3] = sregs.cr3;
 562     env->cr[4] = sregs.cr4;
 563
 564     cpu_set_apic_base(env, sregs.apic_base);
 565
 566     env->efer = sregs.efer;
 567     //cpu_set_apic_tpr(env, sregs.cr8);
 568
 569 #define HFLAG_COPY_MASK ~( \
 570                         HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
 571                         HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
 572                         HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
 573                         HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
 574
 575
 576
 577     hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
 578     hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
 579     hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
 580             (HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
 581     hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
 582     hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
 583             (HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
 584
 585     if (env->efer & MSR_EFER_LMA) {
 586         hflags |= HF_LMA_MASK;
 587     }
 588
 589     if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
 590         hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
 591     } else {
 592         hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
 593                 (DESC_B_SHIFT - HF_CS32_SHIFT);
 594         hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
 595                 (DESC_B_SHIFT - HF_SS32_SHIFT);
 596         if (!(env->cr[0] & CR0_PE_MASK) ||
 597                    (env->eflags & VM_MASK) ||
 598                    !(hflags & HF_CS32_MASK)) {
 599                 hflags |= HF_ADDSEG_MASK;
 600             } else {
 601                 hflags |= ((env->segs[R_DS].base |
 602                                 env->segs[R_ES].base |
 603                                 env->segs[R_SS].base) != 0) <<
 604                     HF_ADDSEG_SHIFT;
 605             }
 606     }
 607     env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
 608
 609     return 0;
 610 }
 611
 612 static int kvm_get_msrs(CPUState *env)
 613 {
 614     struct {
 615         struct kvm_msrs info;
 616         struct kvm_msr_entry entries[100];
 617     } msr_data;
 618     struct kvm_msr_entry *msrs = msr_data.entries;
 619     int ret, i, n;
 620
 621     n = 0;
 622     msrs[n++].index = MSR_IA32_SYSENTER_CS;
 623     msrs[n++].index = MSR_IA32_SYSENTER_ESP;
 624     msrs[n++].index = MSR_IA32_SYSENTER_EIP;
 625     if (kvm_has_msr_star(env))
 626         msrs[n++].index = MSR_STAR;
 627     msrs[n++].index = MSR_IA32_TSC;
 628 #ifdef TARGET_X86_64
 629     /* FIXME lm_capable_kernel */
 630     msrs[n++].index = MSR_CSTAR;
 631     msrs[n++].index = MSR_KERNELGSBASE;
 632     msrs[n++].index = MSR_FMASK;
 633     msrs[n++].index = MSR_LSTAR;
 634 #endif
 635     msr_data.info.nmsrs = n;
 636     ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
 637     if (ret < 0)
 638         return ret;
 639
 640     for (i = 0; i < ret; i++) {
 641         switch (msrs[i].index) {
 642         case MSR_IA32_SYSENTER_CS:
 643             env->sysenter_cs = msrs[i].data;
 644             break;
 645         case MSR_IA32_SYSENTER_ESP:
 646             env->sysenter_esp = msrs[i].data;
 647             break;
 648         case MSR_IA32_SYSENTER_EIP:
 649             env->sysenter_eip = msrs[i].data;
 650             break;
 651         case MSR_STAR:
 652             env->star = msrs[i].data;
 653             break;
 654 #ifdef TARGET_X86_64
 655         case MSR_CSTAR:
 656             env->cstar = msrs[i].data;
 657             break;
 658         case MSR_KERNELGSBASE:
 659             env->kernelgsbase = msrs[i].data;
 660             break;
 661         case MSR_FMASK:
 662             env->fmask = msrs[i].data;
 663             break;
 664         case MSR_LSTAR:
 665             env->lstar = msrs[i].data;
 666             break;
 667 #endif
 668         case MSR_IA32_TSC:
 669             env->tsc = msrs[i].data;
 670             break;
 671         }
 672     }
 673
 674     return 0;
 675 }
 676
 677 static int kvm_put_mp_state(CPUState *env)
 678 {
 679     struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
 680
 681     return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state);
 682 }
 683
 684 static int kvm_get_mp_state(CPUState *env)
 685 {
 686     struct kvm_mp_state mp_state;
 687     int ret;
 688
 689     ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state);
 690     if (ret < 0) {
 691         return ret;
 692     }
 693     env->mp_state = mp_state.mp_state;
 694     return 0;
 695 }
 696
 697 int kvm_arch_put_registers(CPUState *env)
 698 {
 699     int ret;
 700
 701     ret = kvm_getput_regs(env, 1);
 702     if (ret < 0)
 703         return ret;
 704
 705     ret = kvm_put_fpu(env);
 706     if (ret < 0)
 707         return ret;
 708
 709     ret = kvm_put_sregs(env);
 710     if (ret < 0)
 711         return ret;
 712
 713     ret = kvm_put_msrs(env);
 714     if (ret < 0)
 715         return ret;
 716
 717     ret = kvm_put_mp_state(env);
 718     if (ret < 0)
 719         return ret;
 720
 721     ret = kvm_get_mp_state(env);
 722     if (ret < 0)
 723         return ret;
 724
 725     return 0;
 726 }
 727
 728 int kvm_arch_get_registers(CPUState *env)
 729 {
 730     int ret;
 731
 732     ret = kvm_getput_regs(env, 0);
 733     if (ret < 0)
 734         return ret;
 735
 736     ret = kvm_get_fpu(env);
 737     if (ret < 0)
 738         return ret;
 739
 740     ret = kvm_get_sregs(env);
 741     if (ret < 0)
 742         return ret;
 743
 744     ret = kvm_get_msrs(env);
 745     if (ret < 0)
 746         return ret;
 747
 748     return 0;
 749 }
 750
 751 int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
 752 {
 753     /* Try to inject an interrupt if the guest can accept it */
 754     if (run->ready_for_interrupt_injection &&
 755         (env->interrupt_request & CPU_INTERRUPT_HARD) &&
 756         (env->eflags & IF_MASK)) {
 757         int irq;
 758
 759         env->interrupt_request &= ~CPU_INTERRUPT_HARD;
 760         irq = cpu_get_pic_interrupt(env);
 761         if (irq >= 0) {
 762             struct kvm_interrupt intr;
 763             intr.irq = irq;
 764             /* FIXME: errors */
 765             dprintf("injected interrupt %d\n", irq);
 766             kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
 767         }
 768     }
 769
 770     /* If we have an interrupt but the guest is not ready to receive an
 771      * interrupt, request an interrupt window exit.  This will
 772      * cause a return to userspace as soon as the guest is ready to
 773      * receive interrupts. */
 774     if ((env->interrupt_request & CPU_INTERRUPT_HARD))
 775         run->request_interrupt_window = 1;
 776     else
 777         run->request_interrupt_window = 0;
 778
 779     dprintf("setting tpr\n");
 780     run->cr8 = cpu_get_apic_tpr(env);
 781
 782     return 0;
 783 }
 784
 785 int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
 786 {
 787     if (run->if_flag)
 788         env->eflags |= IF_MASK;
 789     else
 790         env->eflags &= ~IF_MASK;
 791
 792     cpu_set_apic_tpr(env, run->cr8);
 793     cpu_set_apic_base(env, run->apic_base);
 794
 795     return 0;
 796 }
 797
 798 static int kvm_handle_halt(CPUState *env)
 799 {
 800     if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
 801           (env->eflags & IF_MASK)) &&
 802         !(env->interrupt_request & CPU_INTERRUPT_NMI)) {
 803         env->halted = 1;
 804         env->exception_index = EXCP_HLT;
 805         return 0;
 806     }
 807
 808     return 1;
 809 }
 810
 811 int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
 812 {
 813     int ret = 0;
 814
 815     switch (run->exit_reason) {
 816     case KVM_EXIT_HLT:
 817         dprintf("handle_hlt\n");
 818         ret = kvm_handle_halt(env);
 819         break;
 820     }
 821
 822     return ret;
 823 }
 824
 825 #ifdef KVM_CAP_SET_GUEST_DEBUG
 826 int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 827 {
 828     static const uint8_t int3 = 0xcc;
 829
 830     if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 0) ||
 831         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&int3, 1, 1))
 832         return -EINVAL;
 833     return 0;
 834 }
 835
 836 int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
 837 {
 838     uint8_t int3;
 839
 840     if (cpu_memory_rw_debug(env, bp->pc, &int3, 1, 0) || int3 != 0xcc ||
 841         cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1))
 842         return -EINVAL;
 843     return 0;
 844 }
 845
 846 static struct {
 847     target_ulong addr;
 848     int len;
 849     int type;
 850 } hw_breakpoint[4];
 851
 852 static int nb_hw_breakpoint;
 853
 854 static int find_hw_breakpoint(target_ulong addr, int len, int type)
 855 {
 856     int n;
 857
 858     for (n = 0; n < nb_hw_breakpoint; n++)
 859         if (hw_breakpoint[n].addr == addr && hw_breakpoint[n].type == type &&
 860             (hw_breakpoint[n].len == len || len == -1))
 861             return n;
 862     return -1;
 863 }
 864
 865 int kvm_arch_insert_hw_breakpoint(target_ulong addr,
 866                                   target_ulong len, int type)
 867 {
 868     switch (type) {
 869     case GDB_BREAKPOINT_HW:
 870         len = 1;
 871         break;
 872     case GDB_WATCHPOINT_WRITE:
 873     case GDB_WATCHPOINT_ACCESS:
 874         switch (len) {
 875         case 1:
 876             break;
 877         case 2:
 878         case 4:
 879         case 8:
 880             if (addr & (len - 1))
 881                 return -EINVAL;
 882             break;
 883         default:
 884             return -EINVAL;
 885         }
 886         break;
 887     default:
 888         return -ENOSYS;
 889     }
 890
 891     if (nb_hw_breakpoint == 4)
 892         return -ENOBUFS;
 893
 894     if (find_hw_breakpoint(addr, len, type) >= 0)
 895         return -EEXIST;
 896
 897     hw_breakpoint[nb_hw_breakpoint].addr = addr;
 898     hw_breakpoint[nb_hw_breakpoint].len = len;
 899     hw_breakpoint[nb_hw_breakpoint].type = type;
 900     nb_hw_breakpoint++;
 901
 902     return 0;
 903 }
 904
 905 int kvm_arch_remove_hw_breakpoint(target_ulong addr,
 906                                   target_ulong len, int type)
 907 {
 908     int n;
 909
 910     n = find_hw_breakpoint(addr, (type == GDB_BREAKPOINT_HW) ? 1 : len, type);
 911     if (n < 0)
 912         return -ENOENT;
 913
 914     nb_hw_breakpoint--;
 915     hw_breakpoint[n] = hw_breakpoint[nb_hw_breakpoint];
 916
 917     return 0;
 918 }
 919
 920 void kvm_arch_remove_all_hw_breakpoints(void)
 921 {
 922     nb_hw_breakpoint = 0;
 923 }
 924
 925 static CPUWatchpoint hw_watchpoint;
 926
 927 int kvm_arch_debug(struct kvm_debug_exit_arch *arch_info)
 928 {
 929     int handle = 0;
 930     int n;
 931
 932     if (arch_info->exception == 1) {
 933         if (arch_info->dr6 & (1 << 14)) {
 934             if (cpu_single_env->singlestep_enabled)
 935                 handle = 1;
 936         } else {
 937             for (n = 0; n < 4; n++)
 938                 if (arch_info->dr6 & (1 << n))
 939                     switch ((arch_info->dr7 >> (16 + n*4)) & 0x3) {
 940                     case 0x0:
 941                         handle = 1;
 942                         break;
 943                     case 0x1:
 944                         handle = 1;
 945                         cpu_single_env->watchpoint_hit = &hw_watchpoint;
 946                         hw_watchpoint.vaddr = hw_breakpoint[n].addr;
 947                         hw_watchpoint.flags = BP_MEM_WRITE;
 948                         break;
 949                     case 0x3:
 950                         handle = 1;
 951                         cpu_single_env->watchpoint_hit = &hw_watchpoint;
 952                         hw_watchpoint.vaddr = hw_breakpoint[n].addr;
 953                         hw_watchpoint.flags = BP_MEM_ACCESS;
 954                         break;
 955                     }
 956         }
 957     } else if (kvm_find_sw_breakpoint(cpu_single_env, arch_info->pc))
 958         handle = 1;
 959
 960     if (!handle)
 961         kvm_update_guest_debug(cpu_single_env,
 962                         (arch_info->exception == 1) ?
 963                         KVM_GUESTDBG_INJECT_DB : KVM_GUESTDBG_INJECT_BP);
 964
 965     return handle;
 966 }
 967
 968 void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg)
 969 {
 970     const uint8_t type_code[] = {
 971         [GDB_BREAKPOINT_HW] = 0x0,
 972         [GDB_WATCHPOINT_WRITE] = 0x1,
 973         [GDB_WATCHPOINT_ACCESS] = 0x3
 974     };
 975     const uint8_t len_code[] = {
 976         [1] = 0x0, [2] = 0x1, [4] = 0x3, [8] = 0x2
 977     };
 978     int n;
 979
 980     if (kvm_sw_breakpoints_active(env))
 981         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
 982
 983     if (nb_hw_breakpoint > 0) {
 984         dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
 985         dbg->arch.debugreg[7] = 0x0600;
 986         for (n = 0; n < nb_hw_breakpoint; n++) {
 987             dbg->arch.debugreg[n] = hw_breakpoint[n].addr;
 988             dbg->arch.debugreg[7] |= (2 << (n * 2)) |
 989                 (type_code[hw_breakpoint[n].type] << (16 + n*4)) |
 990                 (len_code[hw_breakpoint[n].len] << (18 + n*4));
 991         }
 992     }
 993 }
 994 #endif /* KVM_CAP_SET_GUEST_DEBUG */