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