qemu-kvm.c

   1 /*
   2  * qemu/kvm integration
   3  *
   4  * Copyright (C) 2006-2008 Qumranet Technologies
   5  *
   6  * Licensed under the terms of the GNU GPL version 2 or higher.
   7  */
   8 #include "config.h"
   9 #include "config-host.h"
  10
  11 #include <assert.h>
  12 #include <string.h>
  13 #include "hw/hw.h"
  14 #include "sysemu.h"
  15 #include "qemu-common.h"
  16 #include "console.h"
  17 #include "block.h"
  18 #include "compatfd.h"
  19 #include "gdbstub.h"
  20 #include "monitor.h"
  21
  22 #include "qemu-kvm.h"
  23 #include "libkvm.h"
  24
  25 #include <pthread.h>
  26 #include <sys/utsname.h>
  27 #include <sys/syscall.h>
  28 #include <sys/mman.h>
  29 #include <sys/ioctl.h>
  30 #include "compatfd.h"
  31 #include <sys/prctl.h>
  32
  33 #define false 0
  34 #define true 1
  35
  36 #ifndef PR_MCE_KILL
  37 #define PR_MCE_KILL 33
  38 #endif
  39
  40 #ifndef BUS_MCEERR_AR
  41 #define BUS_MCEERR_AR 4
  42 #endif
  43 #ifndef BUS_MCEERR_AO
  44 #define BUS_MCEERR_AO 5
  45 #endif
  46
  47 #define EXPECTED_KVM_API_VERSION 12
  48
  49 #if EXPECTED_KVM_API_VERSION != KVM_API_VERSION
  50 #error libkvm: userspace and kernel version mismatch
  51 #endif
  52
  53 int kvm_irqchip = 1;
  54 int kvm_pit = 1;
  55 int kvm_pit_reinject = 1;
  56 int kvm_nested = 0;
  57
  58
  59 KVMState *kvm_state;
  60 kvm_context_t kvm_context;
  61
  62 pthread_mutex_t qemu_mutex = PTHREAD_MUTEX_INITIALIZER;
  63 pthread_cond_t qemu_vcpu_cond = PTHREAD_COND_INITIALIZER;
  64 pthread_cond_t qemu_system_cond = PTHREAD_COND_INITIALIZER;
  65 pthread_cond_t qemu_pause_cond = PTHREAD_COND_INITIALIZER;
  66 pthread_cond_t qemu_work_cond = PTHREAD_COND_INITIALIZER;
  67 __thread CPUState *current_env;
  68
  69 static int qemu_system_ready;
  70
  71 #define SIG_IPI (SIGRTMIN+4)
  72
  73 pthread_t io_thread;
  74 static int io_thread_sigfd = -1;
  75
  76 static CPUState *kvm_debug_cpu_requested;
  77
  78 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
  79 /* The list of ioperm_data */
  80 static QLIST_HEAD(, ioperm_data) ioperm_head;
  81 #endif
  82
  83 #define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
  84
  85 int kvm_abi = EXPECTED_KVM_API_VERSION;
  86 int kvm_page_size;
  87
  88 #ifdef KVM_CAP_SET_GUEST_DEBUG
  89 static int kvm_debug(CPUState *env,
  90                      struct kvm_debug_exit_arch *arch_info)
  91 {
  92     int handle = kvm_arch_debug(arch_info);
  93
  94     if (handle) {
  95         kvm_debug_cpu_requested = env;
  96         env->stopped = 1;
  97     }
  98     return handle;
  99 }
 100 #endif
 101
 102 static int handle_unhandled(uint64_t reason)
 103 {
 104     fprintf(stderr, "kvm: unhandled exit %" PRIx64 "\n", reason);
 105     return -EINVAL;
 106 }
 107
 108 #define VMX_INVALID_GUEST_STATE 0x80000021
 109
 110 static int handle_failed_vmentry(uint64_t reason)
 111 {
 112     fprintf(stderr, "kvm: vm entry failed with error 0x%" PRIx64 "\n\n", reason);
 113
 114     /* Perhaps we will need to check if this machine is intel since exit reason 0x21
 115        has a different interpretation on SVM */
 116     if (reason == VMX_INVALID_GUEST_STATE) {
 117         fprintf(stderr, "If you're runnning a guest on an Intel machine without\n");
 118         fprintf(stderr, "unrestricted mode support, the failure can be most likely\n");
 119         fprintf(stderr, "due to the guest entering an invalid state for Intel VT.\n");
 120         fprintf(stderr, "For example, the guest maybe running in big real mode\n");
 121         fprintf(stderr, "which is not supported on less recent Intel processors.\n\n");
 122     }
 123
 124     return -EINVAL;
 125 }
 126
 127 static inline void set_gsi(kvm_context_t kvm, unsigned int gsi)
 128 {
 129     uint32_t *bitmap = kvm->used_gsi_bitmap;
 130
 131     if (gsi < kvm->max_gsi)
 132         bitmap[gsi / 32] |= 1U << (gsi % 32);
 133     else
 134         DPRINTF("Invalid GSI %u\n", gsi);
 135 }
 136
 137 static inline void clear_gsi(kvm_context_t kvm, unsigned int gsi)
 138 {
 139     uint32_t *bitmap = kvm->used_gsi_bitmap;
 140
 141     if (gsi < kvm->max_gsi)
 142         bitmap[gsi / 32] &= ~(1U << (gsi % 32));
 143     else
 144         DPRINTF("Invalid GSI %u\n", gsi);
 145 }
 146
 147 static int kvm_create_context(void);
 148
 149 int kvm_init(int smp_cpus)
 150 {
 151     int fd;
 152     int r, gsi_count;
 153
 154
 155     fd = open("/dev/kvm", O_RDWR);
 156     if (fd == -1) {
 157         perror("open /dev/kvm");
 158         return -1;
 159     }
 160     r = ioctl(fd, KVM_GET_API_VERSION, 0);
 161     if (r == -1) {
 162         fprintf(stderr,
 163                 "kvm kernel version too old: "
 164                 "KVM_GET_API_VERSION ioctl not supported\n");
 165         goto out_close;
 166     }
 167     if (r < EXPECTED_KVM_API_VERSION) {
 168         fprintf(stderr, "kvm kernel version too old: "
 169                 "We expect API version %d or newer, but got "
 170                 "version %d\n", EXPECTED_KVM_API_VERSION, r);
 171         goto out_close;
 172     }
 173     if (r > EXPECTED_KVM_API_VERSION) {
 174         fprintf(stderr, "kvm userspace version too old\n");
 175         goto out_close;
 176     }
 177     kvm_abi = r;
 178     kvm_page_size = getpagesize();
 179     kvm_state = qemu_mallocz(sizeof(*kvm_state));
 180     kvm_context = &kvm_state->kvm_context;
 181
 182     kvm_state->fd = fd;
 183     kvm_state->vmfd = -1;
 184     kvm_context->opaque = cpu_single_env;
 185     kvm_context->dirty_pages_log_all = 0;
 186     kvm_context->no_irqchip_creation = 0;
 187     kvm_context->no_pit_creation = 0;
 188
 189 #ifdef KVM_CAP_SET_GUEST_DEBUG
 190     QTAILQ_INIT(&kvm_state->kvm_sw_breakpoints);
 191 #endif
 192
 193     gsi_count = kvm_get_gsi_count(kvm_context);
 194     if (gsi_count > 0) {
 195         int gsi_bits, i;
 196
 197         /* Round up so we can search ints using ffs */
 198         gsi_bits = ALIGN(gsi_count, 32);
 199         kvm_context->used_gsi_bitmap = qemu_mallocz(gsi_bits / 8);
 200         kvm_context->max_gsi = gsi_bits;
 201
 202         /* Mark any over-allocated bits as already in use */
 203         for (i = gsi_count; i < gsi_bits; i++) {
 204             set_gsi(kvm_context, i);
 205         }
 206     }
 207
 208     kvm_cpu_register_phys_memory_client();
 209
 210     pthread_mutex_lock(&qemu_mutex);
 211     return kvm_create_context();
 212
 213   out_close:
 214     close(fd);
 215     return -1;
 216 }
 217
 218 static void kvm_finalize(KVMState *s)
 219 {
 220     /* FIXME
 221        if (kvm->vcpu_fd[0] != -1)
 222            close(kvm->vcpu_fd[0]);
 223        if (kvm->vm_fd != -1)
 224            close(kvm->vm_fd);
 225      */
 226     close(s->fd);
 227     free(s);
 228 }
 229
 230 void kvm_disable_irqchip_creation(kvm_context_t kvm)
 231 {
 232     kvm->no_irqchip_creation = 1;
 233 }
 234
 235 void kvm_disable_pit_creation(kvm_context_t kvm)
 236 {
 237     kvm->no_pit_creation = 1;
 238 }
 239
 240 static void kvm_reset_vcpu(void *opaque)
 241 {
 242     CPUState *env = opaque;
 243
 244     kvm_arch_cpu_reset(env);
 245 }
 246
 247 static void kvm_create_vcpu(CPUState *env, int id)
 248 {
 249     long mmap_size;
 250     int r;
 251     KVMState *s = kvm_state;
 252
 253     r = kvm_vm_ioctl(kvm_state, KVM_CREATE_VCPU, id);
 254     if (r < 0) {
 255         fprintf(stderr, "kvm_create_vcpu: %m\n");
 256         fprintf(stderr, "Failed to create vCPU. Check the -smp parameter.\n");
 257         goto err;
 258     }
 259
 260     env->kvm_fd = r;
 261     env->kvm_state = kvm_state;
 262
 263     mmap_size = kvm_ioctl(kvm_state, KVM_GET_VCPU_MMAP_SIZE, 0);
 264     if (mmap_size < 0) {
 265         fprintf(stderr, "get vcpu mmap size: %m\n");
 266         goto err_fd;
 267     }
 268     env->kvm_run =
 269         mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, env->kvm_fd,
 270              0);
 271     if (env->kvm_run == MAP_FAILED) {
 272         fprintf(stderr, "mmap vcpu area: %m\n");
 273         goto err_fd;
 274     }
 275
 276 #ifdef KVM_CAP_COALESCED_MMIO
 277     if (s->coalesced_mmio && !s->coalesced_mmio_ring)
 278         s->coalesced_mmio_ring = (void *) env->kvm_run +
 279                s->coalesced_mmio * PAGE_SIZE;
 280 #endif
 281
 282     r = kvm_arch_init_vcpu(env);
 283     if (r == 0) {
 284         qemu_register_reset(kvm_reset_vcpu, env);
 285     }
 286
 287     return;
 288   err_fd:
 289     close(env->kvm_fd);
 290   err:
 291     /* We're no good with semi-broken states. */
 292     abort();
 293 }
 294
 295 static int kvm_set_boot_vcpu_id(kvm_context_t kvm, uint32_t id)
 296 {
 297 #ifdef KVM_CAP_SET_BOOT_CPU_ID
 298     int r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_SET_BOOT_CPU_ID);
 299     if (r > 0) {
 300         return kvm_vm_ioctl(kvm_state, KVM_SET_BOOT_CPU_ID, id);
 301     }
 302     return -ENOSYS;
 303 #else
 304     return -ENOSYS;
 305 #endif
 306 }
 307
 308 int kvm_create_vm(kvm_context_t kvm)
 309 {
 310     int fd;
 311 #ifdef KVM_CAP_IRQ_ROUTING
 312     kvm->irq_routes = qemu_mallocz(sizeof(*kvm->irq_routes));
 313     kvm->nr_allocated_irq_routes = 0;
 314 #endif
 315
 316     fd = kvm_ioctl(kvm_state, KVM_CREATE_VM, 0);
 317     if (fd < 0) {
 318         fprintf(stderr, "kvm_create_vm: %m\n");
 319         return -1;
 320     }
 321     kvm_state->vmfd = fd;
 322     return 0;
 323 }
 324
 325 static int kvm_create_default_phys_mem(kvm_context_t kvm,
 326                                        unsigned long phys_mem_bytes,
 327                                        void **vm_mem)
 328 {
 329 #ifdef KVM_CAP_USER_MEMORY
 330     int r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY);
 331     if (r > 0)
 332         return 0;
 333     fprintf(stderr,
 334             "Hypervisor too old: KVM_CAP_USER_MEMORY extension not supported\n");
 335 #else
 336 #error Hypervisor too old: KVM_CAP_USER_MEMORY extension not supported
 337 #endif
 338     return -1;
 339 }
 340
 341 void kvm_create_irqchip(kvm_context_t kvm)
 342 {
 343     int r;
 344
 345     kvm->irqchip_in_kernel = 0;
 346 #ifdef KVM_CAP_IRQCHIP
 347     if (!kvm->no_irqchip_creation) {
 348         r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_IRQCHIP);
 349         if (r > 0) {            /* kernel irqchip supported */
 350             r = kvm_vm_ioctl(kvm_state, KVM_CREATE_IRQCHIP);
 351             if (r >= 0) {
 352                 kvm->irqchip_inject_ioctl = KVM_IRQ_LINE;
 353 #if defined(KVM_CAP_IRQ_INJECT_STATUS) && defined(KVM_IRQ_LINE_STATUS)
 354                 r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION,
 355                               KVM_CAP_IRQ_INJECT_STATUS);
 356                 if (r > 0) {
 357                     kvm->irqchip_inject_ioctl = KVM_IRQ_LINE_STATUS;
 358                 }
 359 #endif
 360                 kvm->irqchip_in_kernel = 1;
 361             } else
 362                 fprintf(stderr, "Create kernel PIC irqchip failed\n");
 363         }
 364     }
 365 #endif
 366     kvm_state->irqchip_in_kernel = kvm->irqchip_in_kernel;
 367 }
 368
 369 int kvm_create(kvm_context_t kvm, unsigned long phys_mem_bytes, void **vm_mem)
 370 {
 371     int r, i;
 372
 373     r = kvm_create_vm(kvm);
 374     if (r < 0) {
 375         return r;
 376     }
 377     r = kvm_arch_create(kvm, phys_mem_bytes, vm_mem);
 378     if (r < 0) {
 379         return r;
 380     }
 381     for (i = 0; i < ARRAY_SIZE(kvm_state->slots); i++) {
 382         kvm_state->slots[i].slot = i;
 383     }
 384
 385     r = kvm_create_default_phys_mem(kvm, phys_mem_bytes, vm_mem);
 386     if (r < 0) {
 387         return r;
 388     }
 389
 390     kvm_create_irqchip(kvm);
 391
 392     return 0;
 393 }
 394
 395 #ifdef KVM_CAP_IRQCHIP
 396
 397 int kvm_set_irq_level(kvm_context_t kvm, int irq, int level, int *status)
 398 {
 399     struct kvm_irq_level event;
 400     int r;
 401
 402     if (!kvm->irqchip_in_kernel) {
 403         return 0;
 404     }
 405     event.level = level;
 406     event.irq = irq;
 407     r = kvm_vm_ioctl(kvm_state, kvm->irqchip_inject_ioctl, &event);
 408     if (r < 0) {
 409         perror("kvm_set_irq_level");
 410     }
 411
 412     if (status) {
 413 #ifdef KVM_CAP_IRQ_INJECT_STATUS
 414         *status =
 415             (kvm->irqchip_inject_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
 416 #else
 417         *status = 1;
 418 #endif
 419     }
 420
 421     return 1;
 422 }
 423
 424 int kvm_get_irqchip(kvm_context_t kvm, struct kvm_irqchip *chip)
 425 {
 426     int r;
 427
 428     if (!kvm->irqchip_in_kernel) {
 429         return 0;
 430     }
 431     r = kvm_vm_ioctl(kvm_state, KVM_GET_IRQCHIP, chip);
 432     if (r < 0) {
 433         perror("kvm_get_irqchip\n");
 434     }
 435     return r;
 436 }
 437
 438 int kvm_set_irqchip(kvm_context_t kvm, struct kvm_irqchip *chip)
 439 {
 440     int r;
 441
 442     if (!kvm->irqchip_in_kernel) {
 443         return 0;
 444     }
 445     r = kvm_vm_ioctl(kvm_state, KVM_SET_IRQCHIP, chip);
 446     if (r < 0) {
 447         perror("kvm_set_irqchip\n");
 448     }
 449     return r;
 450 }
 451
 452 #endif
 453
 454 static int handle_debug(CPUState *env)
 455 {
 456 #ifdef KVM_CAP_SET_GUEST_DEBUG
 457     struct kvm_run *run = env->kvm_run;
 458
 459     return kvm_debug(env, &run->debug.arch);
 460 #else
 461     return 0;
 462 #endif
 463 }
 464
 465 int kvm_get_regs(CPUState *env, struct kvm_regs *regs)
 466 {
 467     return kvm_vcpu_ioctl(env, KVM_GET_REGS, regs);
 468 }
 469
 470 int kvm_set_regs(CPUState *env, struct kvm_regs *regs)
 471 {
 472     return kvm_vcpu_ioctl(env, KVM_SET_REGS, regs);
 473 }
 474
 475 int kvm_get_fpu(CPUState *env, struct kvm_fpu *fpu)
 476 {
 477     return kvm_vcpu_ioctl(env, KVM_GET_FPU, fpu);
 478 }
 479
 480 int kvm_set_fpu(CPUState *env, struct kvm_fpu *fpu)
 481 {
 482     return kvm_vcpu_ioctl(env, KVM_SET_FPU, fpu);
 483 }
 484
 485 int kvm_get_sregs(CPUState *env, struct kvm_sregs *sregs)
 486 {
 487     return kvm_vcpu_ioctl(env, KVM_GET_SREGS, sregs);
 488 }
 489
 490 int kvm_set_sregs(CPUState *env, struct kvm_sregs *sregs)
 491 {
 492     return kvm_vcpu_ioctl(env, KVM_SET_SREGS, sregs);
 493 }
 494
 495 #ifdef KVM_CAP_MP_STATE
 496 int kvm_get_mpstate(CPUState *env, struct kvm_mp_state *mp_state)
 497 {
 498     int r;
 499
 500     r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_MP_STATE);
 501     if (r > 0) {
 502         return kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, mp_state);
 503     }
 504     return -ENOSYS;
 505 }
 506
 507 int kvm_set_mpstate(CPUState *env, struct kvm_mp_state *mp_state)
 508 {
 509     int r;
 510
 511     r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_MP_STATE);
 512     if (r > 0) {
 513         return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, mp_state);
 514     }
 515     return -ENOSYS;
 516 }
 517 #endif
 518
 519 #ifdef KVM_CAP_XSAVE
 520 int kvm_get_xsave(CPUState *env, struct kvm_xsave *xsave)
 521 {
 522     return kvm_vcpu_ioctl(env, KVM_GET_XSAVE, xsave);
 523 }
 524
 525 int kvm_set_xsave(CPUState *env, struct kvm_xsave *xsave)
 526 {
 527     return kvm_vcpu_ioctl(env, KVM_SET_XSAVE, xsave);
 528 }
 529 #endif
 530
 531 #ifdef KVM_CAP_XCRS
 532 int kvm_get_xcrs(CPUState *env, struct kvm_xcrs *xcrs)
 533 {
 534     return kvm_vcpu_ioctl(env, KVM_GET_XCRS, xcrs);
 535 }
 536
 537 int kvm_set_xcrs(CPUState *env, struct kvm_xcrs *xcrs)
 538 {
 539     return kvm_vcpu_ioctl(env, KVM_SET_XCRS, xcrs);
 540 }
 541 #endif
 542
 543 static int handle_mmio(CPUState *env)
 544 {
 545     unsigned long addr = env->kvm_run->mmio.phys_addr;
 546     struct kvm_run *kvm_run = env->kvm_run;
 547     void *data = kvm_run->mmio.data;
 548
 549     /* hack: Red Hat 7.1 generates these weird accesses. */
 550     if ((addr > 0xa0000 - 4 && addr <= 0xa0000) && kvm_run->mmio.len == 3) {
 551         return 0;
 552     }
 553
 554     cpu_physical_memory_rw(addr, data, kvm_run->mmio.len, kvm_run->mmio.is_write);
 555     return 0;
 556 }
 557
 558 int handle_io_window(kvm_context_t kvm)
 559 {
 560     return 1;
 561 }
 562
 563 int handle_shutdown(kvm_context_t kvm, CPUState *env)
 564 {
 565     /* stop the current vcpu from going back to guest mode */
 566     env->stopped = 1;
 567
 568     qemu_system_reset_request();
 569     return 1;
 570 }
 571
 572 static inline void push_nmi(kvm_context_t kvm)
 573 {
 574 #ifdef KVM_CAP_USER_NMI
 575     kvm_arch_push_nmi(kvm->opaque);
 576 #endif                          /* KVM_CAP_USER_NMI */
 577 }
 578
 579 void post_kvm_run(kvm_context_t kvm, CPUState *env)
 580 {
 581     pthread_mutex_lock(&qemu_mutex);
 582     kvm_arch_post_run(env, env->kvm_run);
 583     cpu_single_env = env;
 584 }
 585
 586 int pre_kvm_run(kvm_context_t kvm, CPUState *env)
 587 {
 588     kvm_arch_pre_run(env, env->kvm_run);
 589
 590     pthread_mutex_unlock(&qemu_mutex);
 591     return 0;
 592 }
 593
 594 int kvm_is_ready_for_interrupt_injection(CPUState *env)
 595 {
 596     return env->kvm_run->ready_for_interrupt_injection;
 597 }
 598
 599 int kvm_run(CPUState *env)
 600 {
 601     int r;
 602     kvm_context_t kvm = &env->kvm_state->kvm_context;
 603     struct kvm_run *run = env->kvm_run;
 604     int fd = env->kvm_fd;
 605
 606   again:
 607     if (env->kvm_vcpu_dirty) {
 608         kvm_arch_load_regs(env, KVM_PUT_RUNTIME_STATE);
 609         env->kvm_vcpu_dirty = 0;
 610     }
 611     push_nmi(kvm);
 612 #if !defined(__s390__)
 613     if (!kvm->irqchip_in_kernel) {
 614         run->request_interrupt_window = kvm_arch_try_push_interrupts(env);
 615     }
 616 #endif
 617
 618     r = pre_kvm_run(kvm, env);
 619     if (r) {
 620         return r;
 621     }
 622     if (env->exit_request) {
 623         env->exit_request = 0;
 624         pthread_kill(env->kvm_cpu_state.thread, SIG_IPI);
 625     }
 626     r = ioctl(fd, KVM_RUN, 0);
 627
 628     if (r == -1 && errno != EINTR && errno != EAGAIN) {
 629         r = -errno;
 630         post_kvm_run(kvm, env);
 631         fprintf(stderr, "kvm_run: %s\n", strerror(-r));
 632         return r;
 633     }
 634
 635     post_kvm_run(kvm, env);
 636
 637     kvm_flush_coalesced_mmio_buffer();
 638
 639 #if !defined(__s390__)
 640     if (r == -1) {
 641         r = handle_io_window(kvm);
 642         goto more;
 643     }
 644 #endif
 645     if (1) {
 646         switch (run->exit_reason) {
 647         case KVM_EXIT_UNKNOWN:
 648             r = handle_unhandled(run->hw.hardware_exit_reason);
 649             break;
 650         case KVM_EXIT_FAIL_ENTRY:
 651             r = handle_failed_vmentry(run->fail_entry.hardware_entry_failure_reason);
 652             break;
 653         case KVM_EXIT_EXCEPTION:
 654             fprintf(stderr, "exception %d (%x)\n", run->ex.exception,
 655                     run->ex.error_code);
 656             kvm_show_regs(env);
 657             kvm_show_code(env);
 658             abort();
 659             break;
 660         case KVM_EXIT_IO:
 661             r = kvm_handle_io(run->io.port,
 662                                 (uint8_t *)run + run->io.data_offset,
 663                                 run->io.direction,
 664                                 run->io.size,
 665                                 run->io.count);
 666             r = 0;
 667             break;
 668         case KVM_EXIT_DEBUG:
 669             r = handle_debug(env);
 670             break;
 671         case KVM_EXIT_MMIO:
 672             r = handle_mmio(env);
 673             break;
 674         case KVM_EXIT_HLT:
 675             r = kvm_arch_halt(env);
 676             break;
 677         case KVM_EXIT_IRQ_WINDOW_OPEN:
 678             break;
 679         case KVM_EXIT_SHUTDOWN:
 680             r = handle_shutdown(kvm, env);
 681             break;
 682 #if defined(__s390__)
 683         case KVM_EXIT_S390_SIEIC:
 684             r = kvm_s390_handle_intercept(kvm, env, run);
 685             break;
 686         case KVM_EXIT_S390_RESET:
 687             r = kvm_s390_handle_reset(kvm, env, run);
 688             break;
 689 #endif
 690         case KVM_EXIT_INTERNAL_ERROR:
 691             kvm_handle_internal_error(env, run);
 692             r = 1;
 693             break;
 694         default:
 695             if (kvm_arch_run(env)) {
 696                 fprintf(stderr, "unhandled vm exit: 0x%x\n", run->exit_reason);
 697                 kvm_show_regs(env);
 698                 abort();
 699             }
 700             break;
 701         }
 702     }
 703 more:
 704     if (!r) {
 705         goto again;
 706     }
 707     return r;
 708 }
 709
 710 int kvm_inject_irq(CPUState *env, unsigned irq)
 711 {
 712     struct kvm_interrupt intr;
 713
 714     intr.irq = irq;
 715     return kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
 716 }
 717
 718 int kvm_inject_nmi(CPUState *env)
 719 {
 720 #ifdef KVM_CAP_USER_NMI
 721     return kvm_vcpu_ioctl(env, KVM_NMI);
 722 #else
 723     return -ENOSYS;
 724 #endif
 725 }
 726
 727 int kvm_init_coalesced_mmio(kvm_context_t kvm)
 728 {
 729     int r = 0;
 730     kvm_state->coalesced_mmio = 0;
 731 #ifdef KVM_CAP_COALESCED_MMIO
 732     r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO);
 733     if (r > 0) {
 734         kvm_state->coalesced_mmio = r;
 735         return 0;
 736     }
 737 #endif
 738     return r;
 739 }
 740
 741 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
 742 int kvm_assign_pci_device(kvm_context_t kvm,
 743                           struct kvm_assigned_pci_dev *assigned_dev)
 744 {
 745     return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_PCI_DEVICE, assigned_dev);
 746 }
 747
 748 static int kvm_old_assign_irq(kvm_context_t kvm,
 749                               struct kvm_assigned_irq *assigned_irq)
 750 {
 751     return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_IRQ, assigned_irq);
 752 }
 753
 754 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
 755 int kvm_assign_irq(kvm_context_t kvm, struct kvm_assigned_irq *assigned_irq)
 756 {
 757     int ret;
 758
 759     ret = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_ASSIGN_DEV_IRQ);
 760     if (ret > 0) {
 761         return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_DEV_IRQ, assigned_irq);
 762     }
 763
 764     return kvm_old_assign_irq(kvm, assigned_irq);
 765 }
 766
 767 int kvm_deassign_irq(kvm_context_t kvm, struct kvm_assigned_irq *assigned_irq)
 768 {
 769     return kvm_vm_ioctl(kvm_state, KVM_DEASSIGN_DEV_IRQ, assigned_irq);
 770 }
 771 #else
 772 int kvm_assign_irq(kvm_context_t kvm, struct kvm_assigned_irq *assigned_irq)
 773 {
 774     return kvm_old_assign_irq(kvm, assigned_irq);
 775 }
 776 #endif
 777 #endif
 778
 779 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
 780 int kvm_deassign_pci_device(kvm_context_t kvm,
 781                             struct kvm_assigned_pci_dev *assigned_dev)
 782 {
 783     return kvm_vm_ioctl(kvm_state, KVM_DEASSIGN_PCI_DEVICE, assigned_dev);
 784 }
 785 #endif
 786
 787 int kvm_reinject_control(kvm_context_t kvm, int pit_reinject)
 788 {
 789 #ifdef KVM_CAP_REINJECT_CONTROL
 790     int r;
 791     struct kvm_reinject_control control;
 792
 793     control.pit_reinject = pit_reinject;
 794
 795     r = kvm_ioctl(kvm_state, KVM_CHECK_EXTENSION, KVM_CAP_REINJECT_CONTROL);
 796     if (r > 0) {
 797         return kvm_vm_ioctl(kvm_state, KVM_REINJECT_CONTROL, &control);
 798     }
 799 #endif
 800     return -ENOSYS;
 801 }
 802
 803 int kvm_has_gsi_routing(void)
 804 {
 805     int r = 0;
 806
 807 #ifdef KVM_CAP_IRQ_ROUTING
 808     r = kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
 809 #endif
 810     return r;
 811 }
 812
 813 int kvm_get_gsi_count(kvm_context_t kvm)
 814 {
 815 #ifdef KVM_CAP_IRQ_ROUTING
 816     return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
 817 #else
 818     return -EINVAL;
 819 #endif
 820 }
 821
 822 int kvm_clear_gsi_routes(void)
 823 {
 824 #ifdef KVM_CAP_IRQ_ROUTING
 825     kvm_context_t kvm = kvm_context;
 826
 827     kvm->irq_routes->nr = 0;
 828     return 0;
 829 #else
 830     return -EINVAL;
 831 #endif
 832 }
 833
 834 int kvm_add_routing_entry(struct kvm_irq_routing_entry *entry)
 835 {
 836 #ifdef KVM_CAP_IRQ_ROUTING
 837     kvm_context_t kvm = kvm_context;
 838     struct kvm_irq_routing *z;
 839     struct kvm_irq_routing_entry *new;
 840     int n, size;
 841
 842     if (kvm->irq_routes->nr == kvm->nr_allocated_irq_routes) {
 843         n = kvm->nr_allocated_irq_routes * 2;
 844         if (n < 64) {
 845             n = 64;
 846         }
 847         size = sizeof(struct kvm_irq_routing);
 848         size += n * sizeof(*new);
 849         z = realloc(kvm->irq_routes, size);
 850         if (!z) {
 851             return -ENOMEM;
 852         }
 853         kvm->nr_allocated_irq_routes = n;
 854         kvm->irq_routes = z;
 855     }
 856     n = kvm->irq_routes->nr++;
 857     new = &kvm->irq_routes->entries[n];
 858     memset(new, 0, sizeof(*new));
 859     new->gsi = entry->gsi;
 860     new->type = entry->type;
 861     new->flags = entry->flags;
 862     new->u = entry->u;
 863
 864     set_gsi(kvm, entry->gsi);
 865
 866     return 0;
 867 #else
 868     return -ENOSYS;
 869 #endif
 870 }
 871
 872 int kvm_add_irq_route(int gsi, int irqchip, int pin)
 873 {
 874 #ifdef KVM_CAP_IRQ_ROUTING
 875     struct kvm_irq_routing_entry e;
 876
 877     e.gsi = gsi;
 878     e.type = KVM_IRQ_ROUTING_IRQCHIP;
 879     e.flags = 0;
 880     e.u.irqchip.irqchip = irqchip;
 881     e.u.irqchip.pin = pin;
 882     return kvm_add_routing_entry(&e);
 883 #else
 884     return -ENOSYS;
 885 #endif
 886 }
 887
 888 int kvm_del_routing_entry(struct kvm_irq_routing_entry *entry)
 889 {
 890 #ifdef KVM_CAP_IRQ_ROUTING
 891     kvm_context_t kvm = kvm_context;
 892     struct kvm_irq_routing_entry *e, *p;
 893     int i, gsi, found = 0;
 894
 895     gsi = entry->gsi;
 896
 897     for (i = 0; i < kvm->irq_routes->nr; ++i) {
 898         e = &kvm->irq_routes->entries[i];
 899         if (e->type == entry->type && e->gsi == gsi) {
 900             switch (e->type) {
 901             case KVM_IRQ_ROUTING_IRQCHIP:{
 902                     if (e->u.irqchip.irqchip ==
 903                         entry->u.irqchip.irqchip
 904                         && e->u.irqchip.pin == entry->u.irqchip.pin) {
 905                         p = &kvm->irq_routes->entries[--kvm->irq_routes->nr];
 906                         *e = *p;
 907                         found = 1;
 908                     }
 909                     break;
 910                 }
 911             case KVM_IRQ_ROUTING_MSI:{
 912                     if (e->u.msi.address_lo ==
 913                         entry->u.msi.address_lo
 914                         && e->u.msi.address_hi ==
 915                         entry->u.msi.address_hi
 916                         && e->u.msi.data == entry->u.msi.data) {
 917                         p = &kvm->irq_routes->entries[--kvm->irq_routes->nr];
 918                         *e = *p;
 919                         found = 1;
 920                     }
 921                     break;
 922                 }
 923             default:
 924                 break;
 925             }
 926             if (found) {
 927                 /* If there are no other users of this GSI
 928                  * mark it available in the bitmap */
 929                 for (i = 0; i < kvm->irq_routes->nr; i++) {
 930                     e = &kvm->irq_routes->entries[i];
 931                     if (e->gsi == gsi)
 932                         break;
 933                 }
 934                 if (i == kvm->irq_routes->nr) {
 935                     clear_gsi(kvm, gsi);
 936                 }
 937
 938                 return 0;
 939             }
 940         }
 941     }
 942     return -ESRCH;
 943 #else
 944     return -ENOSYS;
 945 #endif
 946 }
 947
 948 int kvm_update_routing_entry(struct kvm_irq_routing_entry *entry,
 949                              struct kvm_irq_routing_entry *newentry)
 950 {
 951 #ifdef KVM_CAP_IRQ_ROUTING
 952     kvm_context_t kvm = kvm_context;
 953     struct kvm_irq_routing_entry *e;
 954     int i;
 955
 956     if (entry->gsi != newentry->gsi || entry->type != newentry->type) {
 957         return -EINVAL;
 958     }
 959
 960     for (i = 0; i < kvm->irq_routes->nr; ++i) {
 961         e = &kvm->irq_routes->entries[i];
 962         if (e->type != entry->type || e->gsi != entry->gsi) {
 963             continue;
 964         }
 965         switch (e->type) {
 966         case KVM_IRQ_ROUTING_IRQCHIP:
 967             if (e->u.irqchip.irqchip == entry->u.irqchip.irqchip &&
 968                 e->u.irqchip.pin == entry->u.irqchip.pin) {
 969                 memcpy(&e->u.irqchip, &newentry->u.irqchip,
 970                        sizeof e->u.irqchip);
 971                 return 0;
 972             }
 973             break;
 974         case KVM_IRQ_ROUTING_MSI:
 975             if (e->u.msi.address_lo == entry->u.msi.address_lo &&
 976                 e->u.msi.address_hi == entry->u.msi.address_hi &&
 977                 e->u.msi.data == entry->u.msi.data) {
 978                 memcpy(&e->u.msi, &newentry->u.msi, sizeof e->u.msi);
 979                 return 0;
 980             }
 981             break;
 982         default:
 983             break;
 984         }
 985     }
 986     return -ESRCH;
 987 #else
 988     return -ENOSYS;
 989 #endif
 990 }
 991
 992 int kvm_del_irq_route(int gsi, int irqchip, int pin)
 993 {
 994 #ifdef KVM_CAP_IRQ_ROUTING
 995     struct kvm_irq_routing_entry e;
 996
 997     e.gsi = gsi;
 998     e.type = KVM_IRQ_ROUTING_IRQCHIP;
 999     e.flags = 0;
1000     e.u.irqchip.irqchip = irqchip;
1001     e.u.irqchip.pin = pin;
1002     return kvm_del_routing_entry(&e);
1003 #else
1004     return -ENOSYS;
1005 #endif
1006 }
1007
1008 int kvm_commit_irq_routes(void)
1009 {
1010 #ifdef KVM_CAP_IRQ_ROUTING
1011     kvm_context_t kvm = kvm_context;
1012
1013     kvm->irq_routes->flags = 0;
1014     return kvm_vm_ioctl(kvm_state, KVM_SET_GSI_ROUTING, kvm->irq_routes);
1015 #else
1016     return -ENOSYS;
1017 #endif
1018 }
1019
1020 int kvm_get_irq_route_gsi(void)
1021 {
1022     kvm_context_t kvm = kvm_context;
1023     int i, bit;
1024     uint32_t *buf = kvm->used_gsi_bitmap;
1025
1026     /* Return the lowest unused GSI in the bitmap */
1027     for (i = 0; i < kvm->max_gsi / 32; i++) {
1028         bit = ffs(~buf[i]);
1029         if (!bit) {
1030             continue;
1031         }
1032
1033         return bit - 1 + i * 32;
1034     }
1035
1036     return -ENOSPC;
1037 }
1038
1039 static void kvm_msix_routing_entry(struct kvm_irq_routing_entry *e,
1040                                    uint32_t gsi, uint32_t addr_lo,
1041                                    uint32_t addr_hi, uint32_t data)
1042
1043 {
1044     e->gsi = gsi;
1045     e->type = KVM_IRQ_ROUTING_MSI;
1046     e->flags = 0;
1047     e->u.msi.address_lo = addr_lo;
1048     e->u.msi.address_hi = addr_hi;
1049     e->u.msi.data = data;
1050 }
1051
1052 int kvm_add_msix(uint32_t gsi, uint32_t addr_lo,
1053                         uint32_t addr_hi, uint32_t data)
1054 {
1055     struct kvm_irq_routing_entry e;
1056
1057     kvm_msix_routing_entry(&e, gsi, addr_lo, addr_hi, data);
1058     return kvm_add_routing_entry(&e);
1059 }
1060
1061 int kvm_del_msix(uint32_t gsi, uint32_t addr_lo,
1062                         uint32_t addr_hi, uint32_t data)
1063 {
1064     struct kvm_irq_routing_entry e;
1065
1066     kvm_msix_routing_entry(&e, gsi, addr_lo, addr_hi, data);
1067     return kvm_del_routing_entry(&e);
1068 }
1069
1070 int kvm_update_msix(uint32_t old_gsi, uint32_t old_addr_lo,
1071                     uint32_t old_addr_hi, uint32_t old_data,
1072                     uint32_t new_gsi, uint32_t new_addr_lo,
1073                     uint32_t new_addr_hi, uint32_t new_data)
1074 {
1075     struct kvm_irq_routing_entry e1, e2;
1076
1077     kvm_msix_routing_entry(&e1, old_gsi, old_addr_lo, old_addr_hi, old_data);
1078     kvm_msix_routing_entry(&e2, new_gsi, new_addr_lo, new_addr_hi, new_data);
1079     return kvm_update_routing_entry(&e1, &e2);
1080 }
1081
1082
1083 #ifdef KVM_CAP_DEVICE_MSIX
1084 int kvm_assign_set_msix_nr(kvm_context_t kvm,
1085                            struct kvm_assigned_msix_nr *msix_nr)
1086 {
1087     return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_SET_MSIX_NR, msix_nr);
1088 }
1089
1090 int kvm_assign_set_msix_entry(kvm_context_t kvm,
1091                               struct kvm_assigned_msix_entry *entry)
1092 {
1093     return kvm_vm_ioctl(kvm_state, KVM_ASSIGN_SET_MSIX_ENTRY, entry);
1094 }
1095 #endif
1096
1097 #if defined(KVM_CAP_IRQFD) && defined(CONFIG_EVENTFD)
1098
1099 #include <sys/eventfd.h>
1100
1101 static int _kvm_irqfd(kvm_context_t kvm, int fd, int gsi, int flags)
1102 {
1103     struct kvm_irqfd data = {
1104         .fd = fd,
1105         .gsi = gsi,
1106         .flags = flags,
1107     };
1108
1109     return kvm_vm_ioctl(kvm_state, KVM_IRQFD, &data);
1110 }
1111
1112 int kvm_irqfd(kvm_context_t kvm, int gsi, int flags)
1113 {
1114     int r;
1115     int fd;
1116
1117     if (!kvm_check_extension(kvm_state, KVM_CAP_IRQFD))
1118         return -ENOENT;
1119
1120     fd = eventfd(0, 0);
1121     if (fd < 0) {
1122         return -errno;
1123     }
1124
1125     r = _kvm_irqfd(kvm, fd, gsi, 0);
1126     if (r < 0) {
1127         close(fd);
1128         return -errno;
1129     }
1130
1131     return fd;
1132 }
1133
1134 #else                           /* KVM_CAP_IRQFD */
1135
1136 int kvm_irqfd(kvm_context_t kvm, int gsi, int flags)
1137 {
1138     return -ENOSYS;
1139 }
1140
1141 #endif                          /* KVM_CAP_IRQFD */
1142 unsigned long kvm_get_thread_id(void)
1143 {
1144     return syscall(SYS_gettid);
1145 }
1146
1147 static void qemu_cond_wait(pthread_cond_t *cond)
1148 {
1149     CPUState *env = cpu_single_env;
1150
1151     pthread_cond_wait(cond, &qemu_mutex);
1152     cpu_single_env = env;
1153 }
1154
1155 static void sig_ipi_handler(int n)
1156 {
1157 }
1158
1159 static void sigbus_reraise(void)
1160 {
1161     sigset_t set;
1162     struct sigaction action;
1163
1164     memset(&action, 0, sizeof(action));
1165     action.sa_handler = SIG_DFL;
1166     if (!sigaction(SIGBUS, &action, NULL)) {
1167         raise(SIGBUS);
1168         sigemptyset(&set);
1169         sigaddset(&set, SIGBUS);
1170         sigprocmask(SIG_UNBLOCK, &set, NULL);
1171     }
1172     perror("Failed to re-raise SIGBUS!\n");
1173     abort();
1174 }
1175
1176 static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
1177                            void *ctx)
1178 {
1179     if (kvm_on_sigbus(siginfo->ssi_code, (void *)(intptr_t)siginfo->ssi_addr))
1180         sigbus_reraise();
1181 }
1182
1183 void on_vcpu(CPUState *env, void (*func)(void *data), void *data)
1184 {
1185     struct qemu_work_item wi;
1186
1187     if (env == current_env) {
1188         func(data);
1189         return;
1190     }
1191
1192     wi.func = func;
1193     wi.data = data;
1194     if (!env->kvm_cpu_state.queued_work_first) {
1195         env->kvm_cpu_state.queued_work_first = &wi;
1196     } else {
1197         env->kvm_cpu_state.queued_work_last->next = &wi;
1198     }
1199     env->kvm_cpu_state.queued_work_last = &wi;
1200     wi.next = NULL;
1201     wi.done = false;
1202
1203     pthread_kill(env->kvm_cpu_state.thread, SIG_IPI);
1204     while (!wi.done) {
1205         qemu_cond_wait(&qemu_work_cond);
1206     }
1207 }
1208
1209 static void do_kvm_cpu_synchronize_state(void *_env)
1210 {
1211     CPUState *env = _env;
1212
1213     if (!env->kvm_vcpu_dirty) {
1214         kvm_arch_save_regs(env);
1215         env->kvm_vcpu_dirty = 1;
1216     }
1217 }
1218
1219 void kvm_cpu_synchronize_state(CPUState *env)
1220 {
1221     if (!env->kvm_vcpu_dirty) {
1222         on_vcpu(env, do_kvm_cpu_synchronize_state, env);
1223     }
1224 }
1225
1226 void kvm_cpu_synchronize_post_reset(CPUState *env)
1227 {
1228     kvm_arch_load_regs(env, KVM_PUT_RESET_STATE);
1229     env->kvm_vcpu_dirty = 0;
1230 }
1231
1232 void kvm_cpu_synchronize_post_init(CPUState *env)
1233 {
1234     kvm_arch_load_regs(env, KVM_PUT_FULL_STATE);
1235     env->kvm_vcpu_dirty = 0;
1236 }
1237
1238 static void inject_interrupt(void *data)
1239 {
1240     cpu_interrupt(current_env, (long) data);
1241 }
1242
1243 void kvm_inject_interrupt(CPUState *env, int mask)
1244 {
1245     on_vcpu(env, inject_interrupt, (void *) (long) mask);
1246 }
1247
1248 void kvm_update_interrupt_request(CPUState *env)
1249 {
1250     int signal = 0;
1251
1252     if (env) {
1253         if (!current_env || !current_env->created) {
1254             signal = 1;
1255         }
1256         /*
1257          * Testing for created here is really redundant
1258          */
1259         if (current_env && current_env->created &&
1260             env != current_env && !env->kvm_cpu_state.signalled) {
1261             signal = 1;
1262         }
1263
1264         if (signal) {
1265             env->kvm_cpu_state.signalled = 1;
1266             if (env->kvm_cpu_state.thread) {
1267                 pthread_kill(env->kvm_cpu_state.thread, SIG_IPI);
1268             }
1269         }
1270     }
1271 }
1272
1273 int kvm_cpu_exec(CPUState *env)
1274 {
1275     int r;
1276
1277     r = kvm_run(env);
1278     if (r < 0) {
1279         printf("kvm_run returned %d\n", r);
1280         vm_stop(0);
1281     }
1282
1283     return 0;
1284 }
1285
1286 int kvm_cpu_is_stopped(CPUState *env)
1287 {
1288     return !vm_running || env->stopped;
1289 }
1290
1291 static void flush_queued_work(CPUState *env)
1292 {
1293     struct qemu_work_item *wi;
1294
1295     if (!env->kvm_cpu_state.queued_work_first) {
1296         return;
1297     }
1298
1299     while ((wi = env->kvm_cpu_state.queued_work_first)) {
1300         env->kvm_cpu_state.queued_work_first = wi->next;
1301         wi->func(wi->data);
1302         wi->done = true;
1303     }
1304     env->kvm_cpu_state.queued_work_last = NULL;
1305     pthread_cond_broadcast(&qemu_work_cond);
1306 }
1307
1308 static void kvm_main_loop_wait(CPUState *env, int timeout)
1309 {
1310     struct timespec ts;
1311     int r, e;
1312     siginfo_t siginfo;
1313     sigset_t waitset;
1314     sigset_t chkset;
1315
1316     ts.tv_sec = timeout / 1000;
1317     ts.tv_nsec = (timeout % 1000) * 1000000;
1318     sigemptyset(&waitset);
1319     sigaddset(&waitset, SIG_IPI);
1320     sigaddset(&waitset, SIGBUS);
1321
1322     do {
1323         pthread_mutex_unlock(&qemu_mutex);
1324
1325         r = sigtimedwait(&waitset, &siginfo, &ts);
1326         e = errno;
1327
1328         pthread_mutex_lock(&qemu_mutex);
1329
1330         if (r == -1 && !(e == EAGAIN || e == EINTR)) {
1331             printf("sigtimedwait: %s\n", strerror(e));
1332             exit(1);
1333         }
1334
1335         switch (r) {
1336         case SIGBUS:
1337             if (kvm_on_sigbus_vcpu(env, siginfo.si_code, siginfo.si_addr))
1338                 sigbus_reraise();
1339             break;
1340         default:
1341             break;
1342         }
1343
1344         r = sigpending(&chkset);
1345         if (r == -1) {
1346             printf("sigpending: %s\n", strerror(e));
1347             exit(1);
1348         }
1349     } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
1350
1351     cpu_single_env = env;
1352     flush_queued_work(env);
1353
1354     if (env->stop) {
1355         env->stop = 0;
1356         env->stopped = 1;
1357         pthread_cond_signal(&qemu_pause_cond);
1358     }
1359
1360     env->kvm_cpu_state.signalled = 0;
1361 }
1362
1363 static int all_threads_paused(void)
1364 {
1365     CPUState *penv = first_cpu;
1366
1367     while (penv) {
1368         if (penv->stop) {
1369             return 0;
1370         }
1371         penv = (CPUState *) penv->next_cpu;
1372     }
1373
1374     return 1;
1375 }
1376
1377 static void pause_all_threads(void)
1378 {
1379     CPUState *penv = first_cpu;
1380
1381     while (penv) {
1382         if (penv != cpu_single_env) {
1383             penv->stop = 1;
1384             pthread_kill(penv->kvm_cpu_state.thread, SIG_IPI);
1385         } else {
1386             penv->stop = 0;
1387             penv->stopped = 1;
1388             cpu_exit(penv);
1389         }
1390         penv = (CPUState *) penv->next_cpu;
1391     }
1392
1393     while (!all_threads_paused()) {
1394         qemu_cond_wait(&qemu_pause_cond);
1395     }
1396 }
1397
1398 static void resume_all_threads(void)
1399 {
1400     CPUState *penv = first_cpu;
1401
1402     assert(!cpu_single_env);
1403
1404     while (penv) {
1405         penv->stop = 0;
1406         penv->stopped = 0;
1407         pthread_kill(penv->kvm_cpu_state.thread, SIG_IPI);
1408         penv = (CPUState *) penv->next_cpu;
1409     }
1410 }
1411
1412 static void kvm_vm_state_change_handler(void *context, int running, int reason)
1413 {
1414     if (running) {
1415         resume_all_threads();
1416     } else {
1417         pause_all_threads();
1418     }
1419 }
1420
1421 static void setup_kernel_sigmask(CPUState *env)
1422 {
1423     sigset_t set;
1424
1425     sigemptyset(&set);
1426     sigaddset(&set, SIGUSR2);
1427     sigaddset(&set, SIGIO);
1428     sigaddset(&set, SIGALRM);
1429     sigprocmask(SIG_BLOCK, &set, NULL);
1430
1431     sigprocmask(SIG_BLOCK, NULL, &set);
1432     sigdelset(&set, SIG_IPI);
1433     sigdelset(&set, SIGBUS);
1434
1435     kvm_set_signal_mask(env, &set);
1436 }
1437
1438 static void qemu_kvm_system_reset(void)
1439 {
1440     pause_all_threads();
1441
1442     qemu_system_reset();
1443
1444     resume_all_threads();
1445 }
1446
1447 static void process_irqchip_events(CPUState *env)
1448 {
1449     kvm_arch_process_irqchip_events(env);
1450     if (kvm_arch_has_work(env))
1451         env->halted = 0;
1452 }
1453
1454 static int kvm_main_loop_cpu(CPUState *env)
1455 {
1456     while (1) {
1457         int run_cpu = !kvm_cpu_is_stopped(env);
1458         if (run_cpu && !kvm_irqchip_in_kernel()) {
1459             process_irqchip_events(env);
1460             run_cpu = !env->halted;
1461         }
1462         if (run_cpu) {
1463             kvm_cpu_exec(env);
1464             kvm_main_loop_wait(env, 0);
1465         } else {
1466             kvm_main_loop_wait(env, 1000);
1467         }
1468     }
1469     pthread_mutex_unlock(&qemu_mutex);
1470     return 0;
1471 }
1472
1473 static void *ap_main_loop(void *_env)
1474 {
1475     CPUState *env = _env;
1476     sigset_t signals;
1477 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
1478     struct ioperm_data *data = NULL;
1479 #endif
1480
1481     current_env = env;
1482     env->thread_id = kvm_get_thread_id();
1483     sigfillset(&signals);
1484     sigprocmask(SIG_BLOCK, &signals, NULL);
1485
1486 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
1487     /* do ioperm for io ports of assigned devices */
1488     QLIST_FOREACH(data, &ioperm_head, entries)
1489         on_vcpu(env, kvm_arch_do_ioperm, data);
1490 #endif
1491
1492     pthread_mutex_lock(&qemu_mutex);
1493     cpu_single_env = env;
1494
1495     kvm_create_vcpu(env, env->cpu_index);
1496     setup_kernel_sigmask(env);
1497
1498     /* signal VCPU creation */
1499     current_env->created = 1;
1500     pthread_cond_signal(&qemu_vcpu_cond);
1501
1502     /* and wait for machine initialization */
1503     while (!qemu_system_ready) {
1504         qemu_cond_wait(&qemu_system_cond);
1505     }
1506
1507     /* re-initialize cpu_single_env after re-acquiring qemu_mutex */
1508     cpu_single_env = env;
1509
1510     kvm_main_loop_cpu(env);
1511     return NULL;
1512 }
1513
1514 int kvm_init_vcpu(CPUState *env)
1515 {
1516     pthread_create(&env->kvm_cpu_state.thread, NULL, ap_main_loop, env);
1517
1518     while (env->created == 0) {
1519         qemu_cond_wait(&qemu_vcpu_cond);
1520     }
1521
1522     return 0;
1523 }
1524
1525 int kvm_vcpu_inited(CPUState *env)
1526 {
1527     return env->created;
1528 }
1529
1530 #ifdef TARGET_I386
1531 void kvm_hpet_disable_kpit(void)
1532 {
1533     struct kvm_pit_state2 ps2;
1534
1535     kvm_get_pit2(kvm_context, &ps2);
1536     ps2.flags |= KVM_PIT_FLAGS_HPET_LEGACY;
1537     kvm_set_pit2(kvm_context, &ps2);
1538 }
1539
1540 void kvm_hpet_enable_kpit(void)
1541 {
1542     struct kvm_pit_state2 ps2;
1543
1544     kvm_get_pit2(kvm_context, &ps2);
1545     ps2.flags &= ~KVM_PIT_FLAGS_HPET_LEGACY;
1546     kvm_set_pit2(kvm_context, &ps2);
1547 }
1548 #endif
1549
1550 int kvm_init_ap(void)
1551 {
1552     struct sigaction action;
1553
1554     qemu_add_vm_change_state_handler(kvm_vm_state_change_handler, NULL);
1555
1556     signal(SIG_IPI, sig_ipi_handler);
1557
1558     memset(&action, 0, sizeof(action));
1559     action.sa_flags = SA_SIGINFO;
1560     action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
1561     sigaction(SIGBUS, &action, NULL);
1562     prctl(PR_MCE_KILL, 1, 1, 0, 0);
1563     return 0;
1564 }
1565
1566 /* If we have signalfd, we mask out the signals we want to handle and then
1567  * use signalfd to listen for them.  We rely on whatever the current signal
1568  * handler is to dispatch the signals when we receive them.
1569  */
1570
1571 static void sigfd_handler(void *opaque)
1572 {
1573     int fd = (unsigned long) opaque;
1574     struct qemu_signalfd_siginfo info;
1575     struct sigaction action;
1576     ssize_t len;
1577
1578     while (1) {
1579         do {
1580             len = read(fd, &info, sizeof(info));
1581         } while (len == -1 && errno == EINTR);
1582
1583         if (len == -1 && errno == EAGAIN) {
1584             break;
1585         }
1586
1587         if (len != sizeof(info)) {
1588             printf("read from sigfd returned %zd: %m\n", len);
1589             return;
1590         }
1591
1592         sigaction(info.ssi_signo, NULL, &action);
1593         if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
1594             action.sa_sigaction(info.ssi_signo,
1595                                 (siginfo_t *)&info, NULL);
1596         } else if (action.sa_handler) {
1597             action.sa_handler(info.ssi_signo);
1598         }
1599     }
1600 }
1601
1602 int kvm_main_loop(void)
1603 {
1604     sigset_t mask;
1605     int sigfd;
1606
1607     io_thread = pthread_self();
1608     qemu_system_ready = 1;
1609
1610     sigemptyset(&mask);
1611     sigaddset(&mask, SIGIO);
1612     sigaddset(&mask, SIGALRM);
1613     sigaddset(&mask, SIGBUS);
1614     sigprocmask(SIG_BLOCK, &mask, NULL);
1615
1616     sigfd = qemu_signalfd(&mask);
1617     if (sigfd == -1) {
1618         fprintf(stderr, "failed to create signalfd\n");
1619         return -errno;
1620     }
1621
1622     fcntl(sigfd, F_SETFL, O_NONBLOCK);
1623
1624     qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL,
1625                          (void *)(unsigned long) sigfd);
1626
1627     pthread_cond_broadcast(&qemu_system_cond);
1628
1629     io_thread_sigfd = sigfd;
1630     cpu_single_env = NULL;
1631
1632     while (1) {
1633         main_loop_wait(0);
1634         if (qemu_shutdown_requested()) {
1635             monitor_protocol_event(QEVENT_SHUTDOWN, NULL);
1636             if (qemu_no_shutdown()) {
1637                 vm_stop(0);
1638             } else {
1639                 break;
1640             }
1641         } else if (qemu_powerdown_requested()) {
1642             monitor_protocol_event(QEVENT_POWERDOWN, NULL);
1643             qemu_irq_raise(qemu_system_powerdown);
1644         } else if (qemu_reset_requested()) {
1645             qemu_kvm_system_reset();
1646         } else if (kvm_debug_cpu_requested) {
1647             gdb_set_stop_cpu(kvm_debug_cpu_requested);
1648             vm_stop(EXCP_DEBUG);
1649             kvm_debug_cpu_requested = NULL;
1650         }
1651     }
1652
1653     pause_all_threads();
1654     pthread_mutex_unlock(&qemu_mutex);
1655
1656     return 0;
1657 }
1658
1659 #if !defined(TARGET_I386)
1660 int kvm_arch_init_irq_routing(void)
1661 {
1662     return 0;
1663 }
1664 #endif
1665
1666 extern int no_hpet;
1667
1668 static int kvm_create_context(void)
1669 {
1670     static const char upgrade_note[] =
1671     "Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
1672     "(see http://sourceforge.net/projects/kvm).\n";
1673
1674     int r;
1675
1676     if (!kvm_irqchip) {
1677         kvm_disable_irqchip_creation(kvm_context);
1678     }
1679     if (!kvm_pit) {
1680         kvm_disable_pit_creation(kvm_context);
1681     }
1682     if (kvm_create(kvm_context, 0, NULL) < 0) {
1683         kvm_finalize(kvm_state);
1684         return -1;
1685     }
1686     r = kvm_arch_qemu_create_context();
1687     if (r < 0) {
1688         kvm_finalize(kvm_state);
1689         return -1;
1690     }
1691     if (kvm_pit && !kvm_pit_reinject) {
1692         if (kvm_reinject_control(kvm_context, 0)) {
1693             fprintf(stderr, "failure to disable in-kernel PIT reinjection\n");
1694             return -1;
1695         }
1696     }
1697
1698     /* There was a nasty bug in < kvm-80 that prevents memory slots from being
1699      * destroyed properly.  Since we rely on this capability, refuse to work
1700      * with any kernel without this capability. */
1701     if (!kvm_check_extension(kvm_state, KVM_CAP_DESTROY_MEMORY_REGION_WORKS)) {
1702         fprintf(stderr,
1703                 "KVM kernel module broken (DESTROY_MEMORY_REGION).\n%s",
1704                 upgrade_note);
1705         return -EINVAL;
1706     }
1707
1708     r = kvm_arch_init_irq_routing();
1709     if (r < 0) {
1710         return r;
1711     }
1712
1713     kvm_state->vcpu_events = 0;
1714 #ifdef KVM_CAP_VCPU_EVENTS
1715     kvm_state->vcpu_events = kvm_check_extension(kvm_state, KVM_CAP_VCPU_EVENTS);
1716 #endif
1717
1718     kvm_state->debugregs = 0;
1719 #ifdef KVM_CAP_DEBUGREGS
1720     kvm_state->debugregs = kvm_check_extension(kvm_state, KVM_CAP_DEBUGREGS);
1721 #endif
1722
1723     kvm_init_ap();
1724     if (kvm_irqchip) {
1725         if (!qemu_kvm_has_gsi_routing()) {
1726             irq0override = 0;
1727 #ifdef TARGET_I386
1728             /* if kernel can't do irq routing, interrupt source
1729              * override 0->2 can not be set up as required by hpet,
1730              * so disable hpet.
1731              */
1732             no_hpet = 1;
1733         } else if (!qemu_kvm_has_pit_state2()) {
1734             no_hpet = 1;
1735         }
1736 #else
1737         }
1738 #endif
1739     }
1740
1741     return 0;
1742 }
1743
1744 #ifdef KVM_CAP_IRQCHIP
1745
1746 int kvm_set_irq(int irq, int level, int *status)
1747 {
1748     return kvm_set_irq_level(kvm_context, irq, level, status);
1749 }
1750
1751 #endif
1752
1753 static void kvm_mutex_unlock(void)
1754 {
1755     assert(!cpu_single_env);
1756     pthread_mutex_unlock(&qemu_mutex);
1757 }
1758
1759 static void kvm_mutex_lock(void)
1760 {
1761     pthread_mutex_lock(&qemu_mutex);
1762     cpu_single_env = NULL;
1763 }
1764
1765 void qemu_mutex_unlock_iothread(void)
1766 {
1767     if (kvm_enabled()) {
1768         kvm_mutex_unlock();
1769     }
1770 }
1771
1772 void qemu_mutex_lock_iothread(void)
1773 {
1774     if (kvm_enabled()) {
1775         kvm_mutex_lock();
1776     }
1777 }
1778
1779 #ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
1780 void kvm_add_ioperm_data(struct ioperm_data *data)
1781 {
1782     QLIST_INSERT_HEAD(&ioperm_head, data, entries);
1783 }
1784
1785 void kvm_remove_ioperm_data(unsigned long start_port, unsigned long num)
1786 {
1787     struct ioperm_data *data;
1788
1789     data = QLIST_FIRST(&ioperm_head);
1790     while (data) {
1791         struct ioperm_data *next = QLIST_NEXT(data, entries);
1792
1793         if (data->start_port == start_port && data->num == num) {
1794             QLIST_REMOVE(data, entries);
1795             qemu_free(data);
1796         }
1797
1798         data = next;
1799     }
1800 }
1801
1802 void kvm_ioperm(CPUState *env, void *data)
1803 {
1804     if (kvm_enabled() && qemu_system_ready) {
1805         on_vcpu(env, kvm_arch_do_ioperm, data);
1806     }
1807 }
1808
1809 #endif
1810
1811 int kvm_set_boot_cpu_id(uint32_t id)
1812 {
1813     return kvm_set_boot_vcpu_id(kvm_context, id);
1814 }
1815