softmmu/runstate.c

   1 /*
   2  * QEMU main system emulation loop
   3  *
   4  * Copyright (c) 2003-2020 QEMU contributors
   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 #include "qemu/osdep.h"
  26 #include "audio/audio.h"
  27 #include "block/block.h"
  28 #include "block/export.h"
  29 #include "chardev/char.h"
  30 #include "crypto/cipher.h"
  31 #include "crypto/init.h"
  32 #include "exec/cpu-common.h"
  33 #include "exec/exec-all.h"
  34 #include "exec/gdbstub.h"
  35 #include "hw/boards.h"
  36 #include "migration/misc.h"
  37 #include "migration/postcopy-ram.h"
  38 #include "monitor/monitor.h"
  39 #include "net/net.h"
  40 #include "net/vhost_net.h"
  41 #include "qapi/error.h"
  42 #include "qapi/qapi-commands-run-state.h"
  43 #include "qapi/qapi-events-run-state.h"
  44 #include "qemu-common.h"
  45 #include "qemu/error-report.h"
  46 #include "qemu/job.h"
  47 #include "qemu/module.h"
  48 #include "qemu/plugin.h"
  49 #include "qemu/sockets.h"
  50 #include "qemu/thread.h"
  51 #include "qom/object.h"
  52 #include "qom/object_interfaces.h"
  53 #include "sysemu/cpus.h"
  54 #include "sysemu/qtest.h"
  55 #include "sysemu/replay.h"
  56 #include "sysemu/reset.h"
  57 #include "sysemu/runstate.h"
  58 #include "sysemu/runstate-action.h"
  59 #include "sysemu/sysemu.h"
  60 #include "sysemu/tpm.h"
  61 #include "trace.h"
  62
  63 static NotifierList exit_notifiers =
  64     NOTIFIER_LIST_INITIALIZER(exit_notifiers);
  65
  66 static RunState current_run_state = RUN_STATE_PRELAUNCH;
  67
  68 /* We use RUN_STATE__MAX but any invalid value will do */
  69 static RunState vmstop_requested = RUN_STATE__MAX;
  70 static QemuMutex vmstop_lock;
  71
  72 typedef struct {
  73     RunState from;
  74     RunState to;
  75 } RunStateTransition;
  76
  77 static const RunStateTransition runstate_transitions_def[] = {
  78     { RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE },
  79
  80     { RUN_STATE_DEBUG, RUN_STATE_RUNNING },
  81     { RUN_STATE_DEBUG, RUN_STATE_FINISH_MIGRATE },
  82     { RUN_STATE_DEBUG, RUN_STATE_PRELAUNCH },
  83
  84     { RUN_STATE_INMIGRATE, RUN_STATE_INTERNAL_ERROR },
  85     { RUN_STATE_INMIGRATE, RUN_STATE_IO_ERROR },
  86     { RUN_STATE_INMIGRATE, RUN_STATE_PAUSED },
  87     { RUN_STATE_INMIGRATE, RUN_STATE_RUNNING },
  88     { RUN_STATE_INMIGRATE, RUN_STATE_SHUTDOWN },
  89     { RUN_STATE_INMIGRATE, RUN_STATE_SUSPENDED },
  90     { RUN_STATE_INMIGRATE, RUN_STATE_WATCHDOG },
  91     { RUN_STATE_INMIGRATE, RUN_STATE_GUEST_PANICKED },
  92     { RUN_STATE_INMIGRATE, RUN_STATE_FINISH_MIGRATE },
  93     { RUN_STATE_INMIGRATE, RUN_STATE_PRELAUNCH },
  94     { RUN_STATE_INMIGRATE, RUN_STATE_POSTMIGRATE },
  95     { RUN_STATE_INMIGRATE, RUN_STATE_COLO },
  96
  97     { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PAUSED },
  98     { RUN_STATE_INTERNAL_ERROR, RUN_STATE_FINISH_MIGRATE },
  99     { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PRELAUNCH },
 100
 101     { RUN_STATE_IO_ERROR, RUN_STATE_RUNNING },
 102     { RUN_STATE_IO_ERROR, RUN_STATE_FINISH_MIGRATE },
 103     { RUN_STATE_IO_ERROR, RUN_STATE_PRELAUNCH },
 104
 105     { RUN_STATE_PAUSED, RUN_STATE_RUNNING },
 106     { RUN_STATE_PAUSED, RUN_STATE_FINISH_MIGRATE },
 107     { RUN_STATE_PAUSED, RUN_STATE_POSTMIGRATE },
 108     { RUN_STATE_PAUSED, RUN_STATE_PRELAUNCH },
 109     { RUN_STATE_PAUSED, RUN_STATE_COLO},
 110
 111     { RUN_STATE_POSTMIGRATE, RUN_STATE_RUNNING },
 112     { RUN_STATE_POSTMIGRATE, RUN_STATE_FINISH_MIGRATE },
 113     { RUN_STATE_POSTMIGRATE, RUN_STATE_PRELAUNCH },
 114
 115     { RUN_STATE_PRELAUNCH, RUN_STATE_RUNNING },
 116     { RUN_STATE_PRELAUNCH, RUN_STATE_FINISH_MIGRATE },
 117     { RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE },
 118
 119     { RUN_STATE_FINISH_MIGRATE, RUN_STATE_RUNNING },
 120     { RUN_STATE_FINISH_MIGRATE, RUN_STATE_PAUSED },
 121     { RUN_STATE_FINISH_MIGRATE, RUN_STATE_POSTMIGRATE },
 122     { RUN_STATE_FINISH_MIGRATE, RUN_STATE_PRELAUNCH },
 123     { RUN_STATE_FINISH_MIGRATE, RUN_STATE_COLO},
 124
 125     { RUN_STATE_RESTORE_VM, RUN_STATE_RUNNING },
 126     { RUN_STATE_RESTORE_VM, RUN_STATE_PRELAUNCH },
 127
 128     { RUN_STATE_COLO, RUN_STATE_RUNNING },
 129     { RUN_STATE_COLO, RUN_STATE_SHUTDOWN},
 130
 131     { RUN_STATE_RUNNING, RUN_STATE_DEBUG },
 132     { RUN_STATE_RUNNING, RUN_STATE_INTERNAL_ERROR },
 133     { RUN_STATE_RUNNING, RUN_STATE_IO_ERROR },
 134     { RUN_STATE_RUNNING, RUN_STATE_PAUSED },
 135     { RUN_STATE_RUNNING, RUN_STATE_FINISH_MIGRATE },
 136     { RUN_STATE_RUNNING, RUN_STATE_RESTORE_VM },
 137     { RUN_STATE_RUNNING, RUN_STATE_SAVE_VM },
 138     { RUN_STATE_RUNNING, RUN_STATE_SHUTDOWN },
 139     { RUN_STATE_RUNNING, RUN_STATE_WATCHDOG },
 140     { RUN_STATE_RUNNING, RUN_STATE_GUEST_PANICKED },
 141     { RUN_STATE_RUNNING, RUN_STATE_COLO},
 142
 143     { RUN_STATE_SAVE_VM, RUN_STATE_RUNNING },
 144
 145     { RUN_STATE_SHUTDOWN, RUN_STATE_PAUSED },
 146     { RUN_STATE_SHUTDOWN, RUN_STATE_FINISH_MIGRATE },
 147     { RUN_STATE_SHUTDOWN, RUN_STATE_PRELAUNCH },
 148     { RUN_STATE_SHUTDOWN, RUN_STATE_COLO },
 149
 150     { RUN_STATE_DEBUG, RUN_STATE_SUSPENDED },
 151     { RUN_STATE_RUNNING, RUN_STATE_SUSPENDED },
 152     { RUN_STATE_SUSPENDED, RUN_STATE_RUNNING },
 153     { RUN_STATE_SUSPENDED, RUN_STATE_FINISH_MIGRATE },
 154     { RUN_STATE_SUSPENDED, RUN_STATE_PRELAUNCH },
 155     { RUN_STATE_SUSPENDED, RUN_STATE_COLO},
 156
 157     { RUN_STATE_WATCHDOG, RUN_STATE_RUNNING },
 158     { RUN_STATE_WATCHDOG, RUN_STATE_FINISH_MIGRATE },
 159     { RUN_STATE_WATCHDOG, RUN_STATE_PRELAUNCH },
 160     { RUN_STATE_WATCHDOG, RUN_STATE_COLO},
 161
 162     { RUN_STATE_GUEST_PANICKED, RUN_STATE_RUNNING },
 163     { RUN_STATE_GUEST_PANICKED, RUN_STATE_FINISH_MIGRATE },
 164     { RUN_STATE_GUEST_PANICKED, RUN_STATE_PRELAUNCH },
 165
 166     { RUN_STATE__MAX, RUN_STATE__MAX },
 167 };
 168
 169 static bool runstate_valid_transitions[RUN_STATE__MAX][RUN_STATE__MAX];
 170
 171 bool runstate_check(RunState state)
 172 {
 173     return current_run_state == state;
 174 }
 175
 176 bool runstate_store(char *str, size_t size)
 177 {
 178     const char *state = RunState_str(current_run_state);
 179     size_t len = strlen(state) + 1;
 180
 181     if (len > size) {
 182         return false;
 183     }
 184     memcpy(str, state, len);
 185     return true;
 186 }
 187
 188 static void runstate_init(void)
 189 {
 190     const RunStateTransition *p;
 191
 192     memset(&runstate_valid_transitions, 0, sizeof(runstate_valid_transitions));
 193     for (p = &runstate_transitions_def[0]; p->from != RUN_STATE__MAX; p++) {
 194         runstate_valid_transitions[p->from][p->to] = true;
 195     }
 196
 197     qemu_mutex_init(&vmstop_lock);
 198 }
 199
 200 /* This function will abort() on invalid state transitions */
 201 void runstate_set(RunState new_state)
 202 {
 203     assert(new_state < RUN_STATE__MAX);
 204
 205     trace_runstate_set(current_run_state, RunState_str(current_run_state),
 206                        new_state, RunState_str(new_state));
 207
 208     if (current_run_state == new_state) {
 209         return;
 210     }
 211
 212     if (!runstate_valid_transitions[current_run_state][new_state]) {
 213         error_report("invalid runstate transition: '%s' -> '%s'",
 214                      RunState_str(current_run_state),
 215                      RunState_str(new_state));
 216         abort();
 217     }
 218
 219     current_run_state = new_state;
 220 }
 221
 222 bool runstate_is_running(void)
 223 {
 224     return runstate_check(RUN_STATE_RUNNING);
 225 }
 226
 227 bool runstate_needs_reset(void)
 228 {
 229     return runstate_check(RUN_STATE_INTERNAL_ERROR) ||
 230         runstate_check(RUN_STATE_SHUTDOWN);
 231 }
 232
 233 StatusInfo *qmp_query_status(Error **errp)
 234 {
 235     StatusInfo *info = g_malloc0(sizeof(*info));
 236
 237     info->running = runstate_is_running();
 238     info->singlestep = singlestep;
 239     info->status = current_run_state;
 240
 241     return info;
 242 }
 243
 244 bool qemu_vmstop_requested(RunState *r)
 245 {
 246     qemu_mutex_lock(&vmstop_lock);
 247     *r = vmstop_requested;
 248     vmstop_requested = RUN_STATE__MAX;
 249     qemu_mutex_unlock(&vmstop_lock);
 250     return *r < RUN_STATE__MAX;
 251 }
 252
 253 void qemu_system_vmstop_request_prepare(void)
 254 {
 255     qemu_mutex_lock(&vmstop_lock);
 256 }
 257
 258 void qemu_system_vmstop_request(RunState state)
 259 {
 260     vmstop_requested = state;
 261     qemu_mutex_unlock(&vmstop_lock);
 262     qemu_notify_event();
 263 }
 264 struct VMChangeStateEntry {
 265     VMChangeStateHandler *cb;
 266     void *opaque;
 267     QTAILQ_ENTRY(VMChangeStateEntry) entries;
 268     int priority;
 269 };
 270
 271 static QTAILQ_HEAD(, VMChangeStateEntry) vm_change_state_head =
 272     QTAILQ_HEAD_INITIALIZER(vm_change_state_head);
 273
 274 /**
 275  * qemu_add_vm_change_state_handler_prio:
 276  * @cb: the callback to invoke
 277  * @opaque: user data passed to the callback
 278  * @priority: low priorities execute first when the vm runs and the reverse is
 279  *            true when the vm stops
 280  *
 281  * Register a callback function that is invoked when the vm starts or stops
 282  * running.
 283  *
 284  * Returns: an entry to be freed using qemu_del_vm_change_state_handler()
 285  */
 286 VMChangeStateEntry *qemu_add_vm_change_state_handler_prio(
 287         VMChangeStateHandler *cb, void *opaque, int priority)
 288 {
 289     VMChangeStateEntry *e;
 290     VMChangeStateEntry *other;
 291
 292     e = g_malloc0(sizeof(*e));
 293     e->cb = cb;
 294     e->opaque = opaque;
 295     e->priority = priority;
 296
 297     /* Keep list sorted in ascending priority order */
 298     QTAILQ_FOREACH(other, &vm_change_state_head, entries) {
 299         if (priority < other->priority) {
 300             QTAILQ_INSERT_BEFORE(other, e, entries);
 301             return e;
 302         }
 303     }
 304
 305     QTAILQ_INSERT_TAIL(&vm_change_state_head, e, entries);
 306     return e;
 307 }
 308
 309 VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb,
 310                                                      void *opaque)
 311 {
 312     return qemu_add_vm_change_state_handler_prio(cb, opaque, 0);
 313 }
 314
 315 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e)
 316 {
 317     QTAILQ_REMOVE(&vm_change_state_head, e, entries);
 318     g_free(e);
 319 }
 320
 321 void vm_state_notify(bool running, RunState state)
 322 {
 323     VMChangeStateEntry *e, *next;
 324
 325     trace_vm_state_notify(running, state, RunState_str(state));
 326
 327     if (running) {
 328         QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) {
 329             e->cb(e->opaque, running, state);
 330         }
 331     } else {
 332         QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) {
 333             e->cb(e->opaque, running, state);
 334         }
 335     }
 336 }
 337
 338 static ShutdownCause reset_requested;
 339 static ShutdownCause shutdown_requested;
 340 static int shutdown_signal;
 341 static pid_t shutdown_pid;
 342 static int powerdown_requested;
 343 static int debug_requested;
 344 static int suspend_requested;
 345 static WakeupReason wakeup_reason;
 346 static NotifierList powerdown_notifiers =
 347     NOTIFIER_LIST_INITIALIZER(powerdown_notifiers);
 348 static NotifierList suspend_notifiers =
 349     NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
 350 static NotifierList wakeup_notifiers =
 351     NOTIFIER_LIST_INITIALIZER(wakeup_notifiers);
 352 static NotifierList shutdown_notifiers =
 353     NOTIFIER_LIST_INITIALIZER(shutdown_notifiers);
 354 static uint32_t wakeup_reason_mask = ~(1 << QEMU_WAKEUP_REASON_NONE);
 355
 356 ShutdownCause qemu_shutdown_requested_get(void)
 357 {
 358     return shutdown_requested;
 359 }
 360
 361 ShutdownCause qemu_reset_requested_get(void)
 362 {
 363     return reset_requested;
 364 }
 365
 366 static int qemu_shutdown_requested(void)
 367 {
 368     return qatomic_xchg(&shutdown_requested, SHUTDOWN_CAUSE_NONE);
 369 }
 370
 371 static void qemu_kill_report(void)
 372 {
 373     if (!qtest_driver() && shutdown_signal) {
 374         if (shutdown_pid == 0) {
 375             /* This happens for eg ^C at the terminal, so it's worth
 376              * avoiding printing an odd message in that case.
 377              */
 378             error_report("terminating on signal %d", shutdown_signal);
 379         } else {
 380             char *shutdown_cmd = qemu_get_pid_name(shutdown_pid);
 381
 382             error_report("terminating on signal %d from pid " FMT_pid " (%s)",
 383                          shutdown_signal, shutdown_pid,
 384                          shutdown_cmd ? shutdown_cmd : "<unknown process>");
 385             g_free(shutdown_cmd);
 386         }
 387         shutdown_signal = 0;
 388     }
 389 }
 390
 391 static ShutdownCause qemu_reset_requested(void)
 392 {
 393     ShutdownCause r = reset_requested;
 394
 395     if (r && replay_checkpoint(CHECKPOINT_RESET_REQUESTED)) {
 396         reset_requested = SHUTDOWN_CAUSE_NONE;
 397         return r;
 398     }
 399     return SHUTDOWN_CAUSE_NONE;
 400 }
 401
 402 static int qemu_suspend_requested(void)
 403 {
 404     int r = suspend_requested;
 405     if (r && replay_checkpoint(CHECKPOINT_SUSPEND_REQUESTED)) {
 406         suspend_requested = 0;
 407         return r;
 408     }
 409     return false;
 410 }
 411
 412 static WakeupReason qemu_wakeup_requested(void)
 413 {
 414     return wakeup_reason;
 415 }
 416
 417 static int qemu_powerdown_requested(void)
 418 {
 419     int r = powerdown_requested;
 420     powerdown_requested = 0;
 421     return r;
 422 }
 423
 424 static int qemu_debug_requested(void)
 425 {
 426     int r = debug_requested;
 427     debug_requested = 0;
 428     return r;
 429 }
 430
 431 /*
 432  * Reset the VM. Issue an event unless @reason is SHUTDOWN_CAUSE_NONE.
 433  */
 434 void qemu_system_reset(ShutdownCause reason)
 435 {
 436     MachineClass *mc;
 437
 438     mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL;
 439
 440     cpu_synchronize_all_states();
 441
 442     if (mc && mc->reset) {
 443         mc->reset(current_machine);
 444     } else {
 445         qemu_devices_reset();
 446     }
 447     if (reason && reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) {
 448         qapi_event_send_reset(shutdown_caused_by_guest(reason), reason);
 449     }
 450     cpu_synchronize_all_post_reset();
 451 }
 452
 453 /*
 454  * Wake the VM after suspend.
 455  */
 456 static void qemu_system_wakeup(void)
 457 {
 458     MachineClass *mc;
 459
 460     mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL;
 461
 462     if (mc && mc->wakeup) {
 463         mc->wakeup(current_machine);
 464     }
 465 }
 466
 467 void qemu_system_guest_panicked(GuestPanicInformation *info)
 468 {
 469     qemu_log_mask(LOG_GUEST_ERROR, "Guest crashed");
 470
 471     if (current_cpu) {
 472         current_cpu->crash_occurred = true;
 473     }
 474     /*
 475      * TODO:  Currently the available panic actions are: none, pause, and
 476      * shutdown, but in principle debug and reset could be supported as well.
 477      * Investigate any potential use cases for the unimplemented actions.
 478      */
 479     if (panic_action == PANIC_ACTION_PAUSE
 480         || (panic_action == PANIC_ACTION_SHUTDOWN && shutdown_action == SHUTDOWN_ACTION_PAUSE)) {
 481         qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE,
 482                                         !!info, info);
 483         vm_stop(RUN_STATE_GUEST_PANICKED);
 484     } else if (panic_action == PANIC_ACTION_SHUTDOWN) {
 485         qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_POWEROFF,
 486                                        !!info, info);
 487         vm_stop(RUN_STATE_GUEST_PANICKED);
 488         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC);
 489     } else {
 490         qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_RUN,
 491                                         !!info, info);
 492     }
 493
 494     if (info) {
 495         if (info->type == GUEST_PANIC_INFORMATION_TYPE_HYPER_V) {
 496             qemu_log_mask(LOG_GUEST_ERROR, "\nHV crash parameters: (%#"PRIx64
 497                           " %#"PRIx64" %#"PRIx64" %#"PRIx64" %#"PRIx64")\n",
 498                           info->u.hyper_v.arg1,
 499                           info->u.hyper_v.arg2,
 500                           info->u.hyper_v.arg3,
 501                           info->u.hyper_v.arg4,
 502                           info->u.hyper_v.arg5);
 503         } else if (info->type == GUEST_PANIC_INFORMATION_TYPE_S390) {
 504             qemu_log_mask(LOG_GUEST_ERROR, " on cpu %d: %s\n"
 505                           "PSW: 0x%016" PRIx64 " 0x%016" PRIx64"\n",
 506                           info->u.s390.core,
 507                           S390CrashReason_str(info->u.s390.reason),
 508                           info->u.s390.psw_mask,
 509                           info->u.s390.psw_addr);
 510         }
 511         qapi_free_GuestPanicInformation(info);
 512     }
 513 }
 514
 515 void qemu_system_guest_crashloaded(GuestPanicInformation *info)
 516 {
 517     qemu_log_mask(LOG_GUEST_ERROR, "Guest crash loaded");
 518
 519     qapi_event_send_guest_crashloaded(GUEST_PANIC_ACTION_RUN,
 520                                    !!info, info);
 521
 522     if (info) {
 523         qapi_free_GuestPanicInformation(info);
 524     }
 525 }
 526
 527 void qemu_system_reset_request(ShutdownCause reason)
 528 {
 529     if (reboot_action == REBOOT_ACTION_SHUTDOWN &&
 530         reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) {
 531         shutdown_requested = reason;
 532     } else if (!cpus_are_resettable()) {
 533         error_report("cpus are not resettable, terminating");
 534         shutdown_requested = reason;
 535     } else {
 536         reset_requested = reason;
 537     }
 538     cpu_stop_current();
 539     qemu_notify_event();
 540 }
 541
 542 static void qemu_system_suspend(void)
 543 {
 544     pause_all_vcpus();
 545     notifier_list_notify(&suspend_notifiers, NULL);
 546     runstate_set(RUN_STATE_SUSPENDED);
 547     qapi_event_send_suspend();
 548 }
 549
 550 void qemu_system_suspend_request(void)
 551 {
 552     if (runstate_check(RUN_STATE_SUSPENDED)) {
 553         return;
 554     }
 555     suspend_requested = 1;
 556     cpu_stop_current();
 557     qemu_notify_event();
 558 }
 559
 560 void qemu_register_suspend_notifier(Notifier *notifier)
 561 {
 562     notifier_list_add(&suspend_notifiers, notifier);
 563 }
 564
 565 void qemu_system_wakeup_request(WakeupReason reason, Error **errp)
 566 {
 567     trace_system_wakeup_request(reason);
 568
 569     if (!runstate_check(RUN_STATE_SUSPENDED)) {
 570         error_setg(errp,
 571                    "Unable to wake up: guest is not in suspended state");
 572         return;
 573     }
 574     if (!(wakeup_reason_mask & (1 << reason))) {
 575         return;
 576     }
 577     runstate_set(RUN_STATE_RUNNING);
 578     wakeup_reason = reason;
 579     qemu_notify_event();
 580 }
 581
 582 void qemu_system_wakeup_enable(WakeupReason reason, bool enabled)
 583 {
 584     if (enabled) {
 585         wakeup_reason_mask |= (1 << reason);
 586     } else {
 587         wakeup_reason_mask &= ~(1 << reason);
 588     }
 589 }
 590
 591 void qemu_register_wakeup_notifier(Notifier *notifier)
 592 {
 593     notifier_list_add(&wakeup_notifiers, notifier);
 594 }
 595
 596 static bool wakeup_suspend_enabled;
 597
 598 void qemu_register_wakeup_support(void)
 599 {
 600     wakeup_suspend_enabled = true;
 601 }
 602
 603 bool qemu_wakeup_suspend_enabled(void)
 604 {
 605     return wakeup_suspend_enabled;
 606 }
 607
 608 void qemu_system_killed(int signal, pid_t pid)
 609 {
 610     shutdown_signal = signal;
 611     shutdown_pid = pid;
 612     shutdown_action = SHUTDOWN_ACTION_POWEROFF;
 613
 614     /* Cannot call qemu_system_shutdown_request directly because
 615      * we are in a signal handler.
 616      */
 617     shutdown_requested = SHUTDOWN_CAUSE_HOST_SIGNAL;
 618     qemu_notify_event();
 619 }
 620
 621 void qemu_system_shutdown_request(ShutdownCause reason)
 622 {
 623     trace_qemu_system_shutdown_request(reason);
 624     replay_shutdown_request(reason);
 625     shutdown_requested = reason;
 626     qemu_notify_event();
 627 }
 628
 629 static void qemu_system_powerdown(void)
 630 {
 631     qapi_event_send_powerdown();
 632     notifier_list_notify(&powerdown_notifiers, NULL);
 633 }
 634
 635 static void qemu_system_shutdown(ShutdownCause cause)
 636 {
 637     qapi_event_send_shutdown(shutdown_caused_by_guest(cause), cause);
 638     notifier_list_notify(&shutdown_notifiers, &cause);
 639 }
 640
 641 void qemu_system_powerdown_request(void)
 642 {
 643     trace_qemu_system_powerdown_request();
 644     powerdown_requested = 1;
 645     qemu_notify_event();
 646 }
 647
 648 void qemu_register_powerdown_notifier(Notifier *notifier)
 649 {
 650     notifier_list_add(&powerdown_notifiers, notifier);
 651 }
 652
 653 void qemu_register_shutdown_notifier(Notifier *notifier)
 654 {
 655     notifier_list_add(&shutdown_notifiers, notifier);
 656 }
 657
 658 void qemu_system_debug_request(void)
 659 {
 660     debug_requested = 1;
 661     qemu_notify_event();
 662 }
 663
 664 static bool main_loop_should_exit(void)
 665 {
 666     RunState r;
 667     ShutdownCause request;
 668
 669     if (qemu_debug_requested()) {
 670         vm_stop(RUN_STATE_DEBUG);
 671     }
 672     if (qemu_suspend_requested()) {
 673         qemu_system_suspend();
 674     }
 675     request = qemu_shutdown_requested();
 676     if (request) {
 677         qemu_kill_report();
 678         qemu_system_shutdown(request);
 679         if (shutdown_action == SHUTDOWN_ACTION_PAUSE) {
 680             vm_stop(RUN_STATE_SHUTDOWN);
 681         } else {
 682             return true;
 683         }
 684     }
 685     request = qemu_reset_requested();
 686     if (request) {
 687         pause_all_vcpus();
 688         qemu_system_reset(request);
 689         resume_all_vcpus();
 690         /*
 691          * runstate can change in pause_all_vcpus()
 692          * as iothread mutex is unlocked
 693          */
 694         if (!runstate_check(RUN_STATE_RUNNING) &&
 695                 !runstate_check(RUN_STATE_INMIGRATE) &&
 696                 !runstate_check(RUN_STATE_FINISH_MIGRATE)) {
 697             runstate_set(RUN_STATE_PRELAUNCH);
 698         }
 699     }
 700     if (qemu_wakeup_requested()) {
 701         pause_all_vcpus();
 702         qemu_system_wakeup();
 703         notifier_list_notify(&wakeup_notifiers, &wakeup_reason);
 704         wakeup_reason = QEMU_WAKEUP_REASON_NONE;
 705         resume_all_vcpus();
 706         qapi_event_send_wakeup();
 707     }
 708     if (qemu_powerdown_requested()) {
 709         qemu_system_powerdown();
 710     }
 711     if (qemu_vmstop_requested(&r)) {
 712         vm_stop(r);
 713     }
 714     return false;
 715 }
 716
 717 void qemu_main_loop(void)
 718 {
 719 #ifdef CONFIG_PROFILER
 720     int64_t ti;
 721 #endif
 722     while (!main_loop_should_exit()) {
 723 #ifdef CONFIG_PROFILER
 724         ti = profile_getclock();
 725 #endif
 726         main_loop_wait(false);
 727 #ifdef CONFIG_PROFILER
 728         dev_time += profile_getclock() - ti;
 729 #endif
 730     }
 731 }
 732
 733 void qemu_add_exit_notifier(Notifier *notify)
 734 {
 735     notifier_list_add(&exit_notifiers, notify);
 736 }
 737
 738 void qemu_remove_exit_notifier(Notifier *notify)
 739 {
 740     notifier_remove(notify);
 741 }
 742
 743 static void qemu_run_exit_notifiers(void)
 744 {
 745     notifier_list_notify(&exit_notifiers, NULL);
 746 }
 747
 748 void qemu_init_subsystems(void)
 749 {
 750     Error *err = NULL;
 751
 752     os_set_line_buffering();
 753
 754     module_call_init(MODULE_INIT_TRACE);
 755
 756     qemu_init_cpu_list();
 757     qemu_init_cpu_loop();
 758     qemu_mutex_lock_iothread();
 759
 760     atexit(qemu_run_exit_notifiers);
 761
 762     module_call_init(MODULE_INIT_QOM);
 763     module_call_init(MODULE_INIT_MIGRATION);
 764
 765     runstate_init();
 766     precopy_infrastructure_init();
 767     postcopy_infrastructure_init();
 768     monitor_init_globals();
 769
 770     if (qcrypto_init(&err) < 0) {
 771         error_reportf_err(err, "cannot initialize crypto: ");
 772         exit(1);
 773     }
 774
 775     os_setup_early_signal_handling();
 776
 777     bdrv_init_with_whitelist();
 778     socket_init();
 779 }
 780
 781
 782 void qemu_cleanup(void)
 783 {
 784     gdb_exit(0);
 785
 786     /*
 787      * cleaning up the migration object cancels any existing migration
 788      * try to do this early so that it also stops using devices.
 789      */
 790     migration_shutdown();
 791
 792     /*
 793      * Close the exports before draining the block layer. The export
 794      * drivers may have coroutines yielding on it, so we need to clean
 795      * them up before the drain, as otherwise they may be get stuck in
 796      * blk_wait_while_drained().
 797      */
 798     blk_exp_close_all();
 799
 800     /*
 801      * We must cancel all block jobs while the block layer is drained,
 802      * or cancelling will be affected by throttling and thus may block
 803      * for an extended period of time.
 804      * vm_shutdown() will bdrv_drain_all(), so we may as well include
 805      * it in the drained section.
 806      * We do not need to end this section, because we do not want any
 807      * requests happening from here on anyway.
 808      */
 809     bdrv_drain_all_begin();
 810
 811     /* No more vcpu or device emulation activity beyond this point */
 812     vm_shutdown();
 813     replay_finish();
 814
 815     job_cancel_sync_all();
 816     bdrv_close_all();
 817
 818     /* vhost-user must be cleaned up before chardevs.  */
 819     tpm_cleanup();
 820     net_cleanup();
 821     audio_cleanup();
 822     monitor_cleanup();
 823     qemu_chr_cleanup();
 824     user_creatable_cleanup();
 825     /* TODO: unref root container, check all devices are ok */
 826 }