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