cpus.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /* Needed early for CONFIG_BSD etc. */
  26 #include "config-host.h"
  27
  28 #include "monitor/monitor.h"
  29 #include "sysemu/sysemu.h"
  30 #include "exec/gdbstub.h"
  31 #include "sysemu/dma.h"
  32 #include "sysemu/kvm.h"
  33 #include "qmp-commands.h"
  34
  35 #include "qemu/thread.h"
  36 #include "sysemu/cpus.h"
  37 #include "sysemu/qtest.h"
  38 #include "qemu/main-loop.h"
  39 #include "qemu/bitmap.h"
  40
  41 #ifndef _WIN32
  42 #include "qemu/compatfd.h"
  43 #endif
  44
  45 #ifdef CONFIG_LINUX
  46
  47 #include <sys/prctl.h>
  48
  49 #ifndef PR_MCE_KILL
  50 #define PR_MCE_KILL 33
  51 #endif
  52
  53 #ifndef PR_MCE_KILL_SET
  54 #define PR_MCE_KILL_SET 1
  55 #endif
  56
  57 #ifndef PR_MCE_KILL_EARLY
  58 #define PR_MCE_KILL_EARLY 1
  59 #endif
  60
  61 #endif /* CONFIG_LINUX */
  62
  63 static CPUState *next_cpu;
  64
  65 bool cpu_is_stopped(CPUState *cpu)
  66 {
  67     return cpu->stopped || !runstate_is_running();
  68 }
  69
  70 static bool cpu_thread_is_idle(CPUState *cpu)
  71 {
  72     if (cpu->stop || cpu->queued_work_first) {
  73         return false;
  74     }
  75     if (cpu_is_stopped(cpu)) {
  76         return true;
  77     }
  78     if (!cpu->halted || qemu_cpu_has_work(cpu) ||
  79         kvm_halt_in_kernel()) {
  80         return false;
  81     }
  82     return true;
  83 }
  84
  85 static bool all_cpu_threads_idle(void)
  86 {
  87     CPUState *cpu;
  88
  89     for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
  90         if (!cpu_thread_is_idle(cpu)) {
  91             return false;
  92         }
  93     }
  94     return true;
  95 }
  96
  97 /***********************************************************/
  98 /* guest cycle counter */
  99
 100 /* Conversion factor from emulated instructions to virtual clock ticks.  */
 101 static int icount_time_shift;
 102 /* Arbitrarily pick 1MIPS as the minimum allowable speed.  */
 103 #define MAX_ICOUNT_SHIFT 10
 104 /* Compensate for varying guest execution speed.  */
 105 static int64_t qemu_icount_bias;
 106 static QEMUTimer *icount_rt_timer;
 107 static QEMUTimer *icount_vm_timer;
 108 static QEMUTimer *icount_warp_timer;
 109 static int64_t vm_clock_warp_start;
 110 static int64_t qemu_icount;
 111
 112 typedef struct TimersState {
 113     int64_t cpu_ticks_prev;
 114     int64_t cpu_ticks_offset;
 115     int64_t cpu_clock_offset;
 116     int32_t cpu_ticks_enabled;
 117     int64_t dummy;
 118 } TimersState;
 119
 120 static TimersState timers_state;
 121
 122 /* Return the virtual CPU time, based on the instruction counter.  */
 123 int64_t cpu_get_icount(void)
 124 {
 125     int64_t icount;
 126     CPUState *cpu = current_cpu;
 127
 128     icount = qemu_icount;
 129     if (cpu) {
 130         CPUArchState *env = cpu->env_ptr;
 131         if (!can_do_io(env)) {
 132             fprintf(stderr, "Bad clock read\n");
 133         }
 134         icount -= (env->icount_decr.u16.low + env->icount_extra);
 135     }
 136     return qemu_icount_bias + (icount << icount_time_shift);
 137 }
 138
 139 /* return the host CPU cycle counter and handle stop/restart */
 140 int64_t cpu_get_ticks(void)
 141 {
 142     if (use_icount) {
 143         return cpu_get_icount();
 144     }
 145     if (!timers_state.cpu_ticks_enabled) {
 146         return timers_state.cpu_ticks_offset;
 147     } else {
 148         int64_t ticks;
 149         ticks = cpu_get_real_ticks();
 150         if (timers_state.cpu_ticks_prev > ticks) {
 151             /* Note: non increasing ticks may happen if the host uses
 152                software suspend */
 153             timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks;
 154         }
 155         timers_state.cpu_ticks_prev = ticks;
 156         return ticks + timers_state.cpu_ticks_offset;
 157     }
 158 }
 159
 160 /* return the host CPU monotonic timer and handle stop/restart */
 161 int64_t cpu_get_clock(void)
 162 {
 163     int64_t ti;
 164     if (!timers_state.cpu_ticks_enabled) {
 165         return timers_state.cpu_clock_offset;
 166     } else {
 167         ti = get_clock();
 168         return ti + timers_state.cpu_clock_offset;
 169     }
 170 }
 171
 172 /* enable cpu_get_ticks() */
 173 void cpu_enable_ticks(void)
 174 {
 175     if (!timers_state.cpu_ticks_enabled) {
 176         timers_state.cpu_ticks_offset -= cpu_get_real_ticks();
 177         timers_state.cpu_clock_offset -= get_clock();
 178         timers_state.cpu_ticks_enabled = 1;
 179     }
 180 }
 181
 182 /* disable cpu_get_ticks() : the clock is stopped. You must not call
 183    cpu_get_ticks() after that.  */
 184 void cpu_disable_ticks(void)
 185 {
 186     if (timers_state.cpu_ticks_enabled) {
 187         timers_state.cpu_ticks_offset = cpu_get_ticks();
 188         timers_state.cpu_clock_offset = cpu_get_clock();
 189         timers_state.cpu_ticks_enabled = 0;
 190     }
 191 }
 192
 193 /* Correlation between real and virtual time is always going to be
 194    fairly approximate, so ignore small variation.
 195    When the guest is idle real and virtual time will be aligned in
 196    the IO wait loop.  */
 197 #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10)
 198
 199 static void icount_adjust(void)
 200 {
 201     int64_t cur_time;
 202     int64_t cur_icount;
 203     int64_t delta;
 204     static int64_t last_delta;
 205     /* If the VM is not running, then do nothing.  */
 206     if (!runstate_is_running()) {
 207         return;
 208     }
 209     cur_time = cpu_get_clock();
 210     cur_icount = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 211     delta = cur_icount - cur_time;
 212     /* FIXME: This is a very crude algorithm, somewhat prone to oscillation.  */
 213     if (delta > 0
 214         && last_delta + ICOUNT_WOBBLE < delta * 2
 215         && icount_time_shift > 0) {
 216         /* The guest is getting too far ahead.  Slow time down.  */
 217         icount_time_shift--;
 218     }
 219     if (delta < 0
 220         && last_delta - ICOUNT_WOBBLE > delta * 2
 221         && icount_time_shift < MAX_ICOUNT_SHIFT) {
 222         /* The guest is getting too far behind.  Speed time up.  */
 223         icount_time_shift++;
 224     }
 225     last_delta = delta;
 226     qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
 227 }
 228
 229 static void icount_adjust_rt(void *opaque)
 230 {
 231     timer_mod(icount_rt_timer,
 232                    qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
 233     icount_adjust();
 234 }
 235
 236 static void icount_adjust_vm(void *opaque)
 237 {
 238     timer_mod(icount_vm_timer,
 239                    qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
 240                    get_ticks_per_sec() / 10);
 241     icount_adjust();
 242 }
 243
 244 static int64_t qemu_icount_round(int64_t count)
 245 {
 246     return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
 247 }
 248
 249 static void icount_warp_rt(void *opaque)
 250 {
 251     if (vm_clock_warp_start == -1) {
 252         return;
 253     }
 254
 255     if (runstate_is_running()) {
 256         int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
 257         int64_t warp_delta = clock - vm_clock_warp_start;
 258         if (use_icount == 1) {
 259             qemu_icount_bias += warp_delta;
 260         } else {
 261             /*
 262              * In adaptive mode, do not let QEMU_CLOCK_VIRTUAL run too
 263              * far ahead of real time.
 264              */
 265             int64_t cur_time = cpu_get_clock();
 266             int64_t cur_icount = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 267             int64_t delta = cur_time - cur_icount;
 268             qemu_icount_bias += MIN(warp_delta, delta);
 269         }
 270         if (qemu_clock_expired(QEMU_CLOCK_VIRTUAL)) {
 271             qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
 272         }
 273     }
 274     vm_clock_warp_start = -1;
 275 }
 276
 277 void qtest_clock_warp(int64_t dest)
 278 {
 279     int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 280     assert(qtest_enabled());
 281     while (clock < dest) {
 282         int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
 283         int64_t warp = MIN(dest - clock, deadline);
 284         qemu_icount_bias += warp;
 285         qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
 286         clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 287     }
 288     qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
 289 }
 290
 291 void qemu_clock_warp(QEMUClockType type)
 292 {
 293     int64_t deadline;
 294
 295     /*
 296      * There are too many global variables to make the "warp" behavior
 297      * applicable to other clocks.  But a clock argument removes the
 298      * need for if statements all over the place.
 299      */
 300     if (type != QEMU_CLOCK_VIRTUAL || !use_icount) {
 301         return;
 302     }
 303
 304     /*
 305      * If the CPUs have been sleeping, advance QEMU_CLOCK_VIRTUAL timer now.
 306      * This ensures that the deadline for the timer is computed correctly below.
 307      * This also makes sure that the insn counter is synchronized before the
 308      * CPU starts running, in case the CPU is woken by an event other than
 309      * the earliest QEMU_CLOCK_VIRTUAL timer.
 310      */
 311     icount_warp_rt(NULL);
 312     if (!all_cpu_threads_idle() || !qemu_clock_has_timers(QEMU_CLOCK_VIRTUAL)) {
 313         timer_del(icount_warp_timer);
 314         return;
 315     }
 316
 317     if (qtest_enabled()) {
 318         /* When testing, qtest commands advance icount.  */
 319         return;
 320     }
 321
 322     vm_clock_warp_start = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
 323     /* We want to use the earliest deadline from ALL vm_clocks */
 324     deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
 325
 326     /* Maintain prior (possibly buggy) behaviour where if no deadline
 327      * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
 328      * INT32_MAX nanoseconds ahead, we still use INT32_MAX
 329      * nanoseconds.
 330      */
 331     if ((deadline < 0) || (deadline > INT32_MAX)) {
 332         deadline = INT32_MAX;
 333     }
 334
 335     if (deadline > 0) {
 336         /*
 337          * Ensure QEMU_CLOCK_VIRTUAL proceeds even when the virtual CPU goes to
 338          * sleep.  Otherwise, the CPU might be waiting for a future timer
 339          * interrupt to wake it up, but the interrupt never comes because
 340          * the vCPU isn't running any insns and thus doesn't advance the
 341          * QEMU_CLOCK_VIRTUAL.
 342          *
 343          * An extreme solution for this problem would be to never let VCPUs
 344          * sleep in icount mode if there is a pending QEMU_CLOCK_VIRTUAL
 345          * timer; rather time could just advance to the next QEMU_CLOCK_VIRTUAL
 346          * event.  Instead, we do stop VCPUs and only advance QEMU_CLOCK_VIRTUAL
 347          * after some e"real" time, (related to the time left until the next
 348          * event) has passed. The QEMU_CLOCK_REALTIME timer will do this.
 349          * This avoids that the warps are visible externally; for example,
 350          * you will not be sending network packets continuously instead of
 351          * every 100ms.
 352          */
 353         timer_mod(icount_warp_timer, vm_clock_warp_start + deadline);
 354     } else if (deadline == 0) {
 355         qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
 356     }
 357 }
 358
 359 static const VMStateDescription vmstate_timers = {
 360     .name = "timer",
 361     .version_id = 2,
 362     .minimum_version_id = 1,
 363     .minimum_version_id_old = 1,
 364     .fields      = (VMStateField[]) {
 365         VMSTATE_INT64(cpu_ticks_offset, TimersState),
 366         VMSTATE_INT64(dummy, TimersState),
 367         VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
 368         VMSTATE_END_OF_LIST()
 369     }
 370 };
 371
 372 void configure_icount(const char *option)
 373 {
 374     vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
 375     if (!option) {
 376         return;
 377     }
 378
 379     icount_warp_timer = timer_new_ns(QEMU_CLOCK_REALTIME,
 380                                           icount_warp_rt, NULL);
 381     if (strcmp(option, "auto") != 0) {
 382         icount_time_shift = strtol(option, NULL, 0);
 383         use_icount = 1;
 384         return;
 385     }
 386
 387     use_icount = 2;
 388
 389     /* 125MIPS seems a reasonable initial guess at the guest speed.
 390        It will be corrected fairly quickly anyway.  */
 391     icount_time_shift = 3;
 392
 393     /* Have both realtime and virtual time triggers for speed adjustment.
 394        The realtime trigger catches emulated time passing too slowly,
 395        the virtual time trigger catches emulated time passing too fast.
 396        Realtime triggers occur even when idle, so use them less frequently
 397        than VM triggers.  */
 398     icount_rt_timer = timer_new_ms(QEMU_CLOCK_REALTIME,
 399                                         icount_adjust_rt, NULL);
 400     timer_mod(icount_rt_timer,
 401                    qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 1000);
 402     icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
 403                                         icount_adjust_vm, NULL);
 404     timer_mod(icount_vm_timer,
 405                    qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
 406                    get_ticks_per_sec() / 10);
 407 }
 408
 409 /***********************************************************/
 410 void hw_error(const char *fmt, ...)
 411 {
 412     va_list ap;
 413     CPUState *cpu;
 414
 415     va_start(ap, fmt);
 416     fprintf(stderr, "qemu: hardware error: ");
 417     vfprintf(stderr, fmt, ap);
 418     fprintf(stderr, "\n");
 419     for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
 420         fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
 421         cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_FPU);
 422     }
 423     va_end(ap);
 424     abort();
 425 }
 426
 427 void cpu_synchronize_all_states(void)
 428 {
 429     CPUState *cpu;
 430
 431     for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
 432         cpu_synchronize_state(cpu);
 433     }
 434 }
 435
 436 void cpu_synchronize_all_post_reset(void)
 437 {
 438     CPUState *cpu;
 439
 440     for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
 441         cpu_synchronize_post_reset(cpu);
 442     }
 443 }
 444
 445 void cpu_synchronize_all_post_init(void)
 446 {
 447     CPUState *cpu;
 448
 449     for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
 450         cpu_synchronize_post_init(cpu);
 451     }
 452 }
 453
 454 static int do_vm_stop(RunState state)
 455 {
 456     int ret = 0;
 457
 458     if (runstate_is_running()) {
 459         cpu_disable_ticks();
 460         pause_all_vcpus();
 461         runstate_set(state);
 462         vm_state_notify(0, state);
 463         monitor_protocol_event(QEVENT_STOP, NULL);
 464     }
 465
 466     bdrv_drain_all();
 467     ret = bdrv_flush_all();
 468
 469     return ret;
 470 }
 471
 472 static bool cpu_can_run(CPUState *cpu)
 473 {
 474     if (cpu->stop) {
 475         return false;
 476     }
 477     if (cpu_is_stopped(cpu)) {
 478         return false;
 479     }
 480     return true;
 481 }
 482
 483 static void cpu_handle_guest_debug(CPUState *cpu)
 484 {
 485     gdb_set_stop_cpu(cpu);
 486     qemu_system_debug_request();
 487     cpu->stopped = true;
 488 }
 489
 490 static void cpu_signal(int sig)
 491 {
 492     if (current_cpu) {
 493         cpu_exit(current_cpu);
 494     }
 495     exit_request = 1;
 496 }
 497
 498 #ifdef CONFIG_LINUX
 499 static void sigbus_reraise(void)
 500 {
 501     sigset_t set;
 502     struct sigaction action;
 503
 504     memset(&action, 0, sizeof(action));
 505     action.sa_handler = SIG_DFL;
 506     if (!sigaction(SIGBUS, &action, NULL)) {
 507         raise(SIGBUS);
 508         sigemptyset(&set);
 509         sigaddset(&set, SIGBUS);
 510         sigprocmask(SIG_UNBLOCK, &set, NULL);
 511     }
 512     perror("Failed to re-raise SIGBUS!\n");
 513     abort();
 514 }
 515
 516 static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
 517                            void *ctx)
 518 {
 519     if (kvm_on_sigbus(siginfo->ssi_code,
 520                       (void *)(intptr_t)siginfo->ssi_addr)) {
 521         sigbus_reraise();
 522     }
 523 }
 524
 525 static void qemu_init_sigbus(void)
 526 {
 527     struct sigaction action;
 528
 529     memset(&action, 0, sizeof(action));
 530     action.sa_flags = SA_SIGINFO;
 531     action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
 532     sigaction(SIGBUS, &action, NULL);
 533
 534     prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
 535 }
 536
 537 static void qemu_kvm_eat_signals(CPUState *cpu)
 538 {
 539     struct timespec ts = { 0, 0 };
 540     siginfo_t siginfo;
 541     sigset_t waitset;
 542     sigset_t chkset;
 543     int r;
 544
 545     sigemptyset(&waitset);
 546     sigaddset(&waitset, SIG_IPI);
 547     sigaddset(&waitset, SIGBUS);
 548
 549     do {
 550         r = sigtimedwait(&waitset, &siginfo, &ts);
 551         if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
 552             perror("sigtimedwait");
 553             exit(1);
 554         }
 555
 556         switch (r) {
 557         case SIGBUS:
 558             if (kvm_on_sigbus_vcpu(cpu, siginfo.si_code, siginfo.si_addr)) {
 559                 sigbus_reraise();
 560             }
 561             break;
 562         default:
 563             break;
 564         }
 565
 566         r = sigpending(&chkset);
 567         if (r == -1) {
 568             perror("sigpending");
 569             exit(1);
 570         }
 571     } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
 572 }
 573
 574 #else /* !CONFIG_LINUX */
 575
 576 static void qemu_init_sigbus(void)
 577 {
 578 }
 579
 580 static void qemu_kvm_eat_signals(CPUState *cpu)
 581 {
 582 }
 583 #endif /* !CONFIG_LINUX */
 584
 585 #ifndef _WIN32
 586 static void dummy_signal(int sig)
 587 {
 588 }
 589
 590 static void qemu_kvm_init_cpu_signals(CPUState *cpu)
 591 {
 592     int r;
 593     sigset_t set;
 594     struct sigaction sigact;
 595
 596     memset(&sigact, 0, sizeof(sigact));
 597     sigact.sa_handler = dummy_signal;
 598     sigaction(SIG_IPI, &sigact, NULL);
 599
 600     pthread_sigmask(SIG_BLOCK, NULL, &set);
 601     sigdelset(&set, SIG_IPI);
 602     sigdelset(&set, SIGBUS);
 603     r = kvm_set_signal_mask(cpu, &set);
 604     if (r) {
 605         fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
 606         exit(1);
 607     }
 608 }
 609
 610 static void qemu_tcg_init_cpu_signals(void)
 611 {
 612     sigset_t set;
 613     struct sigaction sigact;
 614
 615     memset(&sigact, 0, sizeof(sigact));
 616     sigact.sa_handler = cpu_signal;
 617     sigaction(SIG_IPI, &sigact, NULL);
 618
 619     sigemptyset(&set);
 620     sigaddset(&set, SIG_IPI);
 621     pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 622 }
 623
 624 #else /* _WIN32 */
 625 static void qemu_kvm_init_cpu_signals(CPUState *cpu)
 626 {
 627     abort();
 628 }
 629
 630 static void qemu_tcg_init_cpu_signals(void)
 631 {
 632 }
 633 #endif /* _WIN32 */
 634
 635 static QemuMutex qemu_global_mutex;
 636 static QemuCond qemu_io_proceeded_cond;
 637 static bool iothread_requesting_mutex;
 638
 639 static QemuThread io_thread;
 640
 641 static QemuThread *tcg_cpu_thread;
 642 static QemuCond *tcg_halt_cond;
 643
 644 /* cpu creation */
 645 static QemuCond qemu_cpu_cond;
 646 /* system init */
 647 static QemuCond qemu_pause_cond;
 648 static QemuCond qemu_work_cond;
 649
 650 void qemu_init_cpu_loop(void)
 651 {
 652     qemu_init_sigbus();
 653     qemu_cond_init(&qemu_cpu_cond);
 654     qemu_cond_init(&qemu_pause_cond);
 655     qemu_cond_init(&qemu_work_cond);
 656     qemu_cond_init(&qemu_io_proceeded_cond);
 657     qemu_mutex_init(&qemu_global_mutex);
 658
 659     qemu_thread_get_self(&io_thread);
 660 }
 661
 662 void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
 663 {
 664     struct qemu_work_item wi;
 665
 666     if (qemu_cpu_is_self(cpu)) {
 667         func(data);
 668         return;
 669     }
 670
 671     wi.func = func;
 672     wi.data = data;
 673     wi.free = false;
 674     if (cpu->queued_work_first == NULL) {
 675         cpu->queued_work_first = &wi;
 676     } else {
 677         cpu->queued_work_last->next = &wi;
 678     }
 679     cpu->queued_work_last = &wi;
 680     wi.next = NULL;
 681     wi.done = false;
 682
 683     qemu_cpu_kick(cpu);
 684     while (!wi.done) {
 685         CPUState *self_cpu = current_cpu;
 686
 687         qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
 688         current_cpu = self_cpu;
 689     }
 690 }
 691
 692 void async_run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
 693 {
 694     struct qemu_work_item *wi;
 695
 696     if (qemu_cpu_is_self(cpu)) {
 697         func(data);
 698         return;
 699     }
 700
 701     wi = g_malloc0(sizeof(struct qemu_work_item));
 702     wi->func = func;
 703     wi->data = data;
 704     wi->free = true;
 705     if (cpu->queued_work_first == NULL) {
 706         cpu->queued_work_first = wi;
 707     } else {
 708         cpu->queued_work_last->next = wi;
 709     }
 710     cpu->queued_work_last = wi;
 711     wi->next = NULL;
 712     wi->done = false;
 713
 714     qemu_cpu_kick(cpu);
 715 }
 716
 717 static void flush_queued_work(CPUState *cpu)
 718 {
 719     struct qemu_work_item *wi;
 720
 721     if (cpu->queued_work_first == NULL) {
 722         return;
 723     }
 724
 725     while ((wi = cpu->queued_work_first)) {
 726         cpu->queued_work_first = wi->next;
 727         wi->func(wi->data);
 728         wi->done = true;
 729         if (wi->free) {
 730             g_free(wi);
 731         }
 732     }
 733     cpu->queued_work_last = NULL;
 734     qemu_cond_broadcast(&qemu_work_cond);
 735 }
 736
 737 static void qemu_wait_io_event_common(CPUState *cpu)
 738 {
 739     if (cpu->stop) {
 740         cpu->stop = false;
 741         cpu->stopped = true;
 742         qemu_cond_signal(&qemu_pause_cond);
 743     }
 744     flush_queued_work(cpu);
 745     cpu->thread_kicked = false;
 746 }
 747
 748 static void qemu_tcg_wait_io_event(void)
 749 {
 750     CPUState *cpu;
 751
 752     while (all_cpu_threads_idle()) {
 753        /* Start accounting real time to the virtual clock if the CPUs
 754           are idle.  */
 755         qemu_clock_warp(QEMU_CLOCK_VIRTUAL);
 756         qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
 757     }
 758
 759     while (iothread_requesting_mutex) {
 760         qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex);
 761     }
 762
 763     for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
 764         qemu_wait_io_event_common(cpu);
 765     }
 766 }
 767
 768 static void qemu_kvm_wait_io_event(CPUState *cpu)
 769 {
 770     while (cpu_thread_is_idle(cpu)) {
 771         qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
 772     }
 773
 774     qemu_kvm_eat_signals(cpu);
 775     qemu_wait_io_event_common(cpu);
 776 }
 777
 778 static void *qemu_kvm_cpu_thread_fn(void *arg)
 779 {
 780     CPUState *cpu = arg;
 781     int r;
 782
 783     qemu_mutex_lock(&qemu_global_mutex);
 784     qemu_thread_get_self(cpu->thread);
 785     cpu->thread_id = qemu_get_thread_id();
 786     current_cpu = cpu;
 787
 788     r = kvm_init_vcpu(cpu);
 789     if (r < 0) {
 790         fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
 791         exit(1);
 792     }
 793
 794     qemu_kvm_init_cpu_signals(cpu);
 795
 796     /* signal CPU creation */
 797     cpu->created = true;
 798     qemu_cond_signal(&qemu_cpu_cond);
 799
 800     while (1) {
 801         if (cpu_can_run(cpu)) {
 802             r = kvm_cpu_exec(cpu);
 803             if (r == EXCP_DEBUG) {
 804                 cpu_handle_guest_debug(cpu);
 805             }
 806         }
 807         qemu_kvm_wait_io_event(cpu);
 808     }
 809
 810     return NULL;
 811 }
 812
 813 static void *qemu_dummy_cpu_thread_fn(void *arg)
 814 {
 815 #ifdef _WIN32
 816     fprintf(stderr, "qtest is not supported under Windows\n");
 817     exit(1);
 818 #else
 819     CPUState *cpu = arg;
 820     sigset_t waitset;
 821     int r;
 822
 823     qemu_mutex_lock_iothread();
 824     qemu_thread_get_self(cpu->thread);
 825     cpu->thread_id = qemu_get_thread_id();
 826
 827     sigemptyset(&waitset);
 828     sigaddset(&waitset, SIG_IPI);
 829
 830     /* signal CPU creation */
 831     cpu->created = true;
 832     qemu_cond_signal(&qemu_cpu_cond);
 833
 834     current_cpu = cpu;
 835     while (1) {
 836         current_cpu = NULL;
 837         qemu_mutex_unlock_iothread();
 838         do {
 839             int sig;
 840             r = sigwait(&waitset, &sig);
 841         } while (r == -1 && (errno == EAGAIN || errno == EINTR));
 842         if (r == -1) {
 843             perror("sigwait");
 844             exit(1);
 845         }
 846         qemu_mutex_lock_iothread();
 847         current_cpu = cpu;
 848         qemu_wait_io_event_common(cpu);
 849     }
 850
 851     return NULL;
 852 #endif
 853 }
 854
 855 static void tcg_exec_all(void);
 856
 857 static void tcg_signal_cpu_creation(CPUState *cpu, void *data)
 858 {
 859     cpu->thread_id = qemu_get_thread_id();
 860     cpu->created = true;
 861 }
 862
 863 static void *qemu_tcg_cpu_thread_fn(void *arg)
 864 {
 865     CPUState *cpu = arg;
 866
 867     qemu_tcg_init_cpu_signals();
 868     qemu_thread_get_self(cpu->thread);
 869
 870     qemu_mutex_lock(&qemu_global_mutex);
 871     qemu_for_each_cpu(tcg_signal_cpu_creation, NULL);
 872     qemu_cond_signal(&qemu_cpu_cond);
 873
 874     /* wait for initial kick-off after machine start */
 875     while (first_cpu->stopped) {
 876         qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
 877
 878         /* process any pending work */
 879         for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
 880             qemu_wait_io_event_common(cpu);
 881         }
 882     }
 883
 884     while (1) {
 885         tcg_exec_all();
 886
 887         if (use_icount) {
 888             int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
 889
 890             if (deadline == 0) {
 891                 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
 892             }
 893         }
 894         qemu_tcg_wait_io_event();
 895     }
 896
 897     return NULL;
 898 }
 899
 900 static void qemu_cpu_kick_thread(CPUState *cpu)
 901 {
 902 #ifndef _WIN32
 903     int err;
 904
 905     err = pthread_kill(cpu->thread->thread, SIG_IPI);
 906     if (err) {
 907         fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
 908         exit(1);
 909     }
 910 #else /* _WIN32 */
 911     if (!qemu_cpu_is_self(cpu)) {
 912         CONTEXT tcgContext;
 913
 914         if (SuspendThread(cpu->hThread) == (DWORD)-1) {
 915             fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
 916                     GetLastError());
 917             exit(1);
 918         }
 919
 920         /* On multi-core systems, we are not sure that the thread is actually
 921          * suspended until we can get the context.
 922          */
 923         tcgContext.ContextFlags = CONTEXT_CONTROL;
 924         while (GetThreadContext(cpu->hThread, &tcgContext) != 0) {
 925             continue;
 926         }
 927
 928         cpu_signal(0);
 929
 930         if (ResumeThread(cpu->hThread) == (DWORD)-1) {
 931             fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
 932                     GetLastError());
 933             exit(1);
 934         }
 935     }
 936 #endif
 937 }
 938
 939 void qemu_cpu_kick(CPUState *cpu)
 940 {
 941     qemu_cond_broadcast(cpu->halt_cond);
 942     if (!tcg_enabled() && !cpu->thread_kicked) {
 943         qemu_cpu_kick_thread(cpu);
 944         cpu->thread_kicked = true;
 945     }
 946 }
 947
 948 void qemu_cpu_kick_self(void)
 949 {
 950 #ifndef _WIN32
 951     assert(current_cpu);
 952
 953     if (!current_cpu->thread_kicked) {
 954         qemu_cpu_kick_thread(current_cpu);
 955         current_cpu->thread_kicked = true;
 956     }
 957 #else
 958     abort();
 959 #endif
 960 }
 961
 962 bool qemu_cpu_is_self(CPUState *cpu)
 963 {
 964     return qemu_thread_is_self(cpu->thread);
 965 }
 966
 967 static bool qemu_in_vcpu_thread(void)
 968 {
 969     return current_cpu && qemu_cpu_is_self(current_cpu);
 970 }
 971
 972 void qemu_mutex_lock_iothread(void)
 973 {
 974     if (!tcg_enabled()) {
 975         qemu_mutex_lock(&qemu_global_mutex);
 976     } else {
 977         iothread_requesting_mutex = true;
 978         if (qemu_mutex_trylock(&qemu_global_mutex)) {
 979             qemu_cpu_kick_thread(first_cpu);
 980             qemu_mutex_lock(&qemu_global_mutex);
 981         }
 982         iothread_requesting_mutex = false;
 983         qemu_cond_broadcast(&qemu_io_proceeded_cond);
 984     }
 985 }
 986
 987 void qemu_mutex_unlock_iothread(void)
 988 {
 989     qemu_mutex_unlock(&qemu_global_mutex);
 990 }
 991
 992 static int all_vcpus_paused(void)
 993 {
 994     CPUState *cpu = first_cpu;
 995
 996     while (cpu) {
 997         if (!cpu->stopped) {
 998             return 0;
 999         }
1000         cpu = cpu->next_cpu;
1001     }
1002
1003     return 1;
1004 }
1005
1006 void pause_all_vcpus(void)
1007 {
1008     CPUState *cpu = first_cpu;
1009
1010     qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
1011     while (cpu) {
1012         cpu->stop = true;
1013         qemu_cpu_kick(cpu);
1014         cpu = cpu->next_cpu;
1015     }
1016
1017     if (qemu_in_vcpu_thread()) {
1018         cpu_stop_current();
1019         if (!kvm_enabled()) {
1020             cpu = first_cpu;
1021             while (cpu) {
1022                 cpu->stop = false;
1023                 cpu->stopped = true;
1024                 cpu = cpu->next_cpu;
1025             }
1026             return;
1027         }
1028     }
1029
1030     while (!all_vcpus_paused()) {
1031         qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
1032         cpu = first_cpu;
1033         while (cpu) {
1034             qemu_cpu_kick(cpu);
1035             cpu = cpu->next_cpu;
1036         }
1037     }
1038 }
1039
1040 void cpu_resume(CPUState *cpu)
1041 {
1042     cpu->stop = false;
1043     cpu->stopped = false;
1044     qemu_cpu_kick(cpu);
1045 }
1046
1047 void resume_all_vcpus(void)
1048 {
1049     CPUState *cpu = first_cpu;
1050
1051     qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
1052     while (cpu) {
1053         cpu_resume(cpu);
1054         cpu = cpu->next_cpu;
1055     }
1056 }
1057
1058 static void qemu_tcg_init_vcpu(CPUState *cpu)
1059 {
1060     /* share a single thread for all cpus with TCG */
1061     if (!tcg_cpu_thread) {
1062         cpu->thread = g_malloc0(sizeof(QemuThread));
1063         cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1064         qemu_cond_init(cpu->halt_cond);
1065         tcg_halt_cond = cpu->halt_cond;
1066         qemu_thread_create(cpu->thread, qemu_tcg_cpu_thread_fn, cpu,
1067                            QEMU_THREAD_JOINABLE);
1068 #ifdef _WIN32
1069         cpu->hThread = qemu_thread_get_handle(cpu->thread);
1070 #endif
1071         while (!cpu->created) {
1072             qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1073         }
1074         tcg_cpu_thread = cpu->thread;
1075     } else {
1076         cpu->thread = tcg_cpu_thread;
1077         cpu->halt_cond = tcg_halt_cond;
1078     }
1079 }
1080
1081 static void qemu_kvm_start_vcpu(CPUState *cpu)
1082 {
1083     cpu->thread = g_malloc0(sizeof(QemuThread));
1084     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1085     qemu_cond_init(cpu->halt_cond);
1086     qemu_thread_create(cpu->thread, qemu_kvm_cpu_thread_fn, cpu,
1087                        QEMU_THREAD_JOINABLE);
1088     while (!cpu->created) {
1089         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1090     }
1091 }
1092
1093 static void qemu_dummy_start_vcpu(CPUState *cpu)
1094 {
1095     cpu->thread = g_malloc0(sizeof(QemuThread));
1096     cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1097     qemu_cond_init(cpu->halt_cond);
1098     qemu_thread_create(cpu->thread, qemu_dummy_cpu_thread_fn, cpu,
1099                        QEMU_THREAD_JOINABLE);
1100     while (!cpu->created) {
1101         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1102     }
1103 }
1104
1105 void qemu_init_vcpu(CPUState *cpu)
1106 {
1107     cpu->nr_cores = smp_cores;
1108     cpu->nr_threads = smp_threads;
1109     cpu->stopped = true;
1110     if (kvm_enabled()) {
1111         qemu_kvm_start_vcpu(cpu);
1112     } else if (tcg_enabled()) {
1113         qemu_tcg_init_vcpu(cpu);
1114     } else {
1115         qemu_dummy_start_vcpu(cpu);
1116     }
1117 }
1118
1119 void cpu_stop_current(void)
1120 {
1121     if (current_cpu) {
1122         current_cpu->stop = false;
1123         current_cpu->stopped = true;
1124         cpu_exit(current_cpu);
1125         qemu_cond_signal(&qemu_pause_cond);
1126     }
1127 }
1128
1129 int vm_stop(RunState state)
1130 {
1131     if (qemu_in_vcpu_thread()) {
1132         qemu_system_vmstop_request(state);
1133         /*
1134          * FIXME: should not return to device code in case
1135          * vm_stop() has been requested.
1136          */
1137         cpu_stop_current();
1138         return 0;
1139     }
1140
1141     return do_vm_stop(state);
1142 }
1143
1144 /* does a state transition even if the VM is already stopped,
1145    current state is forgotten forever */
1146 int vm_stop_force_state(RunState state)
1147 {
1148     if (runstate_is_running()) {
1149         return vm_stop(state);
1150     } else {
1151         runstate_set(state);
1152         /* Make sure to return an error if the flush in a previous vm_stop()
1153          * failed. */
1154         return bdrv_flush_all();
1155     }
1156 }
1157
1158 static int tcg_cpu_exec(CPUArchState *env)
1159 {
1160     int ret;
1161 #ifdef CONFIG_PROFILER
1162     int64_t ti;
1163 #endif
1164
1165 #ifdef CONFIG_PROFILER
1166     ti = profile_getclock();
1167 #endif
1168     if (use_icount) {
1169         int64_t count;
1170         int64_t deadline;
1171         int decr;
1172         qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
1173         env->icount_decr.u16.low = 0;
1174         env->icount_extra = 0;
1175         deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
1176
1177         /* Maintain prior (possibly buggy) behaviour where if no deadline
1178          * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
1179          * INT32_MAX nanoseconds ahead, we still use INT32_MAX
1180          * nanoseconds.
1181          */
1182         if ((deadline < 0) || (deadline > INT32_MAX)) {
1183             deadline = INT32_MAX;
1184         }
1185
1186         count = qemu_icount_round(deadline);
1187         qemu_icount += count;
1188         decr = (count > 0xffff) ? 0xffff : count;
1189         count -= decr;
1190         env->icount_decr.u16.low = decr;
1191         env->icount_extra = count;
1192     }
1193     ret = cpu_exec(env);
1194 #ifdef CONFIG_PROFILER
1195     qemu_time += profile_getclock() - ti;
1196 #endif
1197     if (use_icount) {
1198         /* Fold pending instructions back into the
1199            instruction counter, and clear the interrupt flag.  */
1200         qemu_icount -= (env->icount_decr.u16.low
1201                         + env->icount_extra);
1202         env->icount_decr.u32 = 0;
1203         env->icount_extra = 0;
1204     }
1205     return ret;
1206 }
1207
1208 static void tcg_exec_all(void)
1209 {
1210     int r;
1211
1212     /* Account partial waits to QEMU_CLOCK_VIRTUAL.  */
1213     qemu_clock_warp(QEMU_CLOCK_VIRTUAL);
1214
1215     if (next_cpu == NULL) {
1216         next_cpu = first_cpu;
1217     }
1218     for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
1219         CPUState *cpu = next_cpu;
1220         CPUArchState *env = cpu->env_ptr;
1221
1222         qemu_clock_enable(QEMU_CLOCK_VIRTUAL,
1223                           (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
1224
1225         if (cpu_can_run(cpu)) {
1226             r = tcg_cpu_exec(env);
1227             if (r == EXCP_DEBUG) {
1228                 cpu_handle_guest_debug(cpu);
1229                 break;
1230             }
1231         } else if (cpu->stop || cpu->stopped) {
1232             break;
1233         }
1234     }
1235     exit_request = 0;
1236 }
1237
1238 void set_numa_modes(void)
1239 {
1240     CPUState *cpu;
1241     int i;
1242
1243     for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
1244         for (i = 0; i < nb_numa_nodes; i++) {
1245             if (test_bit(cpu->cpu_index, node_cpumask[i])) {
1246                 cpu->numa_node = i;
1247             }
1248         }
1249     }
1250 }
1251
1252 void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
1253 {
1254     /* XXX: implement xxx_cpu_list for targets that still miss it */
1255 #if defined(cpu_list)
1256     cpu_list(f, cpu_fprintf);
1257 #endif
1258 }
1259
1260 CpuInfoList *qmp_query_cpus(Error **errp)
1261 {
1262     CpuInfoList *head = NULL, *cur_item = NULL;
1263     CPUState *cpu;
1264
1265     for (cpu = first_cpu; cpu != NULL; cpu = cpu->next_cpu) {
1266         CpuInfoList *info;
1267 #if defined(TARGET_I386)
1268         X86CPU *x86_cpu = X86_CPU(cpu);
1269         CPUX86State *env = &x86_cpu->env;
1270 #elif defined(TARGET_PPC)
1271         PowerPCCPU *ppc_cpu = POWERPC_CPU(cpu);
1272         CPUPPCState *env = &ppc_cpu->env;
1273 #elif defined(TARGET_SPARC)
1274         SPARCCPU *sparc_cpu = SPARC_CPU(cpu);
1275         CPUSPARCState *env = &sparc_cpu->env;
1276 #elif defined(TARGET_MIPS)
1277         MIPSCPU *mips_cpu = MIPS_CPU(cpu);
1278         CPUMIPSState *env = &mips_cpu->env;
1279 #endif
1280
1281         cpu_synchronize_state(cpu);
1282
1283         info = g_malloc0(sizeof(*info));
1284         info->value = g_malloc0(sizeof(*info->value));
1285         info->value->CPU = cpu->cpu_index;
1286         info->value->current = (cpu == first_cpu);
1287         info->value->halted = cpu->halted;
1288         info->value->thread_id = cpu->thread_id;
1289 #if defined(TARGET_I386)
1290         info->value->has_pc = true;
1291         info->value->pc = env->eip + env->segs[R_CS].base;
1292 #elif defined(TARGET_PPC)
1293         info->value->has_nip = true;
1294         info->value->nip = env->nip;
1295 #elif defined(TARGET_SPARC)
1296         info->value->has_pc = true;
1297         info->value->pc = env->pc;
1298         info->value->has_npc = true;
1299         info->value->npc = env->npc;
1300 #elif defined(TARGET_MIPS)
1301         info->value->has_PC = true;
1302         info->value->PC = env->active_tc.PC;
1303 #endif
1304
1305         /* XXX: waiting for the qapi to support GSList */
1306         if (!cur_item) {
1307             head = cur_item = info;
1308         } else {
1309             cur_item->next = info;
1310             cur_item = info;
1311         }
1312     }
1313
1314     return head;
1315 }
1316
1317 void qmp_memsave(int64_t addr, int64_t size, const char *filename,
1318                  bool has_cpu, int64_t cpu_index, Error **errp)
1319 {
1320     FILE *f;
1321     uint32_t l;
1322     CPUState *cpu;
1323     uint8_t buf[1024];
1324
1325     if (!has_cpu) {
1326         cpu_index = 0;
1327     }
1328
1329     cpu = qemu_get_cpu(cpu_index);
1330     if (cpu == NULL) {
1331         error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
1332                   "a CPU number");
1333         return;
1334     }
1335
1336     f = fopen(filename, "wb");
1337     if (!f) {
1338         error_setg_file_open(errp, errno, filename);
1339         return;
1340     }
1341
1342     while (size != 0) {
1343         l = sizeof(buf);
1344         if (l > size)
1345             l = size;
1346         cpu_memory_rw_debug(cpu, addr, buf, l, 0);
1347         if (fwrite(buf, 1, l, f) != l) {
1348             error_set(errp, QERR_IO_ERROR);
1349             goto exit;
1350         }
1351         addr += l;
1352         size -= l;
1353     }
1354
1355 exit:
1356     fclose(f);
1357 }
1358
1359 void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
1360                   Error **errp)
1361 {
1362     FILE *f;
1363     uint32_t l;
1364     uint8_t buf[1024];
1365
1366     f = fopen(filename, "wb");
1367     if (!f) {
1368         error_setg_file_open(errp, errno, filename);
1369         return;
1370     }
1371
1372     while (size != 0) {
1373         l = sizeof(buf);
1374         if (l > size)
1375             l = size;
1376         cpu_physical_memory_rw(addr, buf, l, 0);
1377         if (fwrite(buf, 1, l, f) != l) {
1378             error_set(errp, QERR_IO_ERROR);
1379             goto exit;
1380         }
1381         addr += l;
1382         size -= l;
1383     }
1384
1385 exit:
1386     fclose(f);
1387 }
1388
1389 void qmp_inject_nmi(Error **errp)
1390 {
1391 #if defined(TARGET_I386)
1392     CPUState *cs;
1393
1394     for (cs = first_cpu; cs != NULL; cs = cs->next_cpu) {
1395         X86CPU *cpu = X86_CPU(cs);
1396         CPUX86State *env = &cpu->env;
1397
1398         if (!env->apic_state) {
1399             cpu_interrupt(cs, CPU_INTERRUPT_NMI);
1400         } else {
1401             apic_deliver_nmi(env->apic_state);
1402         }
1403     }
1404 #else
1405     error_set(errp, QERR_UNSUPPORTED);
1406 #endif
1407 }