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 "gdbstub/syscalls.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/accel.h" 44 #include "qemu/error-report.h" 45 #include "qemu/job.h" 46 #include "qemu/log.h" 47 #include "qemu/module.h" 48 #include "qemu/plugin.h" 49 #include "qemu/sockets.h" 50 #include "qemu/timer.h" 51 #include "qemu/thread.h" 52 #include "qom/object.h" 53 #include "qom/object_interfaces.h" 54 #include "sysemu/cpus.h" 55 #include "sysemu/qtest.h" 56 #include "sysemu/replay.h" 57 #include "sysemu/reset.h" 58 #include "sysemu/runstate.h" 59 #include "sysemu/runstate-action.h" 60 #include "sysemu/sysemu.h" 61 #include "sysemu/tpm.h" 62 #include "trace.h" 63 64 static NotifierList exit_notifiers = 65 NOTIFIER_LIST_INITIALIZER(exit_notifiers); 66 67 static RunState current_run_state = RUN_STATE_PRELAUNCH; 68 69 /* We use RUN_STATE__MAX but any invalid value will do */ 70 static RunState vmstop_requested = RUN_STATE__MAX; 71 static QemuMutex vmstop_lock; 72 73 typedef struct { 74 RunState from; 75 RunState to; 76 } RunStateTransition; 77 78 static const RunStateTransition runstate_transitions_def[] = { 79 { RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE }, 80 81 { RUN_STATE_DEBUG, RUN_STATE_RUNNING }, 82 { RUN_STATE_DEBUG, RUN_STATE_FINISH_MIGRATE }, 83 { RUN_STATE_DEBUG, RUN_STATE_PRELAUNCH }, 84 85 { RUN_STATE_INMIGRATE, RUN_STATE_INTERNAL_ERROR }, 86 { RUN_STATE_INMIGRATE, RUN_STATE_IO_ERROR }, 87 { RUN_STATE_INMIGRATE, RUN_STATE_PAUSED }, 88 { RUN_STATE_INMIGRATE, RUN_STATE_RUNNING }, 89 { RUN_STATE_INMIGRATE, RUN_STATE_SHUTDOWN }, 90 { RUN_STATE_INMIGRATE, RUN_STATE_SUSPENDED }, 91 { RUN_STATE_INMIGRATE, RUN_STATE_WATCHDOG }, 92 { RUN_STATE_INMIGRATE, RUN_STATE_GUEST_PANICKED }, 93 { RUN_STATE_INMIGRATE, RUN_STATE_FINISH_MIGRATE }, 94 { RUN_STATE_INMIGRATE, RUN_STATE_PRELAUNCH }, 95 { RUN_STATE_INMIGRATE, RUN_STATE_POSTMIGRATE }, 96 { RUN_STATE_INMIGRATE, RUN_STATE_COLO }, 97 98 { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PAUSED }, 99 { RUN_STATE_INTERNAL_ERROR, RUN_STATE_FINISH_MIGRATE }, 100 { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PRELAUNCH }, 101 102 { RUN_STATE_IO_ERROR, RUN_STATE_RUNNING }, 103 { RUN_STATE_IO_ERROR, RUN_STATE_FINISH_MIGRATE }, 104 { RUN_STATE_IO_ERROR, RUN_STATE_PRELAUNCH }, 105 106 { RUN_STATE_PAUSED, RUN_STATE_RUNNING }, 107 { RUN_STATE_PAUSED, RUN_STATE_FINISH_MIGRATE }, 108 { RUN_STATE_PAUSED, RUN_STATE_POSTMIGRATE }, 109 { RUN_STATE_PAUSED, RUN_STATE_PRELAUNCH }, 110 { RUN_STATE_PAUSED, RUN_STATE_COLO}, 111 112 { RUN_STATE_POSTMIGRATE, RUN_STATE_RUNNING }, 113 { RUN_STATE_POSTMIGRATE, RUN_STATE_FINISH_MIGRATE }, 114 { RUN_STATE_POSTMIGRATE, RUN_STATE_PRELAUNCH }, 115 116 { RUN_STATE_PRELAUNCH, RUN_STATE_RUNNING }, 117 { RUN_STATE_PRELAUNCH, RUN_STATE_FINISH_MIGRATE }, 118 { RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE }, 119 120 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_RUNNING }, 121 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_PAUSED }, 122 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_POSTMIGRATE }, 123 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_PRELAUNCH }, 124 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_COLO }, 125 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_INTERNAL_ERROR }, 126 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_IO_ERROR }, 127 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_SHUTDOWN }, 128 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_SUSPENDED }, 129 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_WATCHDOG }, 130 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_GUEST_PANICKED }, 131 132 { RUN_STATE_RESTORE_VM, RUN_STATE_RUNNING }, 133 { RUN_STATE_RESTORE_VM, RUN_STATE_PRELAUNCH }, 134 135 { RUN_STATE_COLO, RUN_STATE_RUNNING }, 136 { RUN_STATE_COLO, RUN_STATE_PRELAUNCH }, 137 { RUN_STATE_COLO, RUN_STATE_SHUTDOWN}, 138 139 { RUN_STATE_RUNNING, RUN_STATE_DEBUG }, 140 { RUN_STATE_RUNNING, RUN_STATE_INTERNAL_ERROR }, 141 { RUN_STATE_RUNNING, RUN_STATE_IO_ERROR }, 142 { RUN_STATE_RUNNING, RUN_STATE_PAUSED }, 143 { RUN_STATE_RUNNING, RUN_STATE_FINISH_MIGRATE }, 144 { RUN_STATE_RUNNING, RUN_STATE_RESTORE_VM }, 145 { RUN_STATE_RUNNING, RUN_STATE_SAVE_VM }, 146 { RUN_STATE_RUNNING, RUN_STATE_SHUTDOWN }, 147 { RUN_STATE_RUNNING, RUN_STATE_WATCHDOG }, 148 { RUN_STATE_RUNNING, RUN_STATE_GUEST_PANICKED }, 149 { RUN_STATE_RUNNING, RUN_STATE_COLO}, 150 151 { RUN_STATE_SAVE_VM, RUN_STATE_RUNNING }, 152 153 { RUN_STATE_SHUTDOWN, RUN_STATE_PAUSED }, 154 { RUN_STATE_SHUTDOWN, RUN_STATE_FINISH_MIGRATE }, 155 { RUN_STATE_SHUTDOWN, RUN_STATE_PRELAUNCH }, 156 { RUN_STATE_SHUTDOWN, RUN_STATE_COLO }, 157 158 { RUN_STATE_DEBUG, RUN_STATE_SUSPENDED }, 159 { RUN_STATE_RUNNING, RUN_STATE_SUSPENDED }, 160 { RUN_STATE_SUSPENDED, RUN_STATE_RUNNING }, 161 { RUN_STATE_SUSPENDED, RUN_STATE_FINISH_MIGRATE }, 162 { RUN_STATE_SUSPENDED, RUN_STATE_PRELAUNCH }, 163 { RUN_STATE_SUSPENDED, RUN_STATE_COLO}, 164 165 { RUN_STATE_WATCHDOG, RUN_STATE_RUNNING }, 166 { RUN_STATE_WATCHDOG, RUN_STATE_FINISH_MIGRATE }, 167 { RUN_STATE_WATCHDOG, RUN_STATE_PRELAUNCH }, 168 { RUN_STATE_WATCHDOG, RUN_STATE_COLO}, 169 170 { RUN_STATE_GUEST_PANICKED, RUN_STATE_RUNNING }, 171 { RUN_STATE_GUEST_PANICKED, RUN_STATE_FINISH_MIGRATE }, 172 { RUN_STATE_GUEST_PANICKED, RUN_STATE_PRELAUNCH }, 173 174 { RUN_STATE__MAX, RUN_STATE__MAX }, 175 }; 176 177 static bool runstate_valid_transitions[RUN_STATE__MAX][RUN_STATE__MAX]; 178 179 bool runstate_check(RunState state) 180 { 181 return current_run_state == state; 182 } 183 184 static void runstate_init(void) 185 { 186 const RunStateTransition *p; 187 188 memset(&runstate_valid_transitions, 0, sizeof(runstate_valid_transitions)); 189 for (p = &runstate_transitions_def[0]; p->from != RUN_STATE__MAX; p++) { 190 runstate_valid_transitions[p->from][p->to] = true; 191 } 192 193 qemu_mutex_init(&vmstop_lock); 194 } 195 196 /* This function will abort() on invalid state transitions */ 197 void runstate_set(RunState new_state) 198 { 199 assert(new_state < RUN_STATE__MAX); 200 201 trace_runstate_set(current_run_state, RunState_str(current_run_state), 202 new_state, RunState_str(new_state)); 203 204 if (current_run_state == new_state) { 205 return; 206 } 207 208 if (!runstate_valid_transitions[current_run_state][new_state]) { 209 error_report("invalid runstate transition: '%s' -> '%s'", 210 RunState_str(current_run_state), 211 RunState_str(new_state)); 212 abort(); 213 } 214 215 current_run_state = new_state; 216 } 217 218 RunState runstate_get(void) 219 { 220 return current_run_state; 221 } 222 223 bool runstate_is_running(void) 224 { 225 return runstate_check(RUN_STATE_RUNNING); 226 } 227 228 bool runstate_needs_reset(void) 229 { 230 return runstate_check(RUN_STATE_INTERNAL_ERROR) || 231 runstate_check(RUN_STATE_SHUTDOWN); 232 } 233 234 StatusInfo *qmp_query_status(Error **errp) 235 { 236 StatusInfo *info = g_malloc0(sizeof(*info)); 237 AccelState *accel = current_accel(); 238 239 /* 240 * We ignore errors, which will happen if the accelerator 241 * is not TCG. "singlestep" is meaningless for other accelerators, 242 * so we will set the StatusInfo field to false for those. 243 */ 244 info->singlestep = object_property_get_bool(OBJECT(accel), 245 "one-insn-per-tb", NULL); 246 info->running = runstate_is_running(); 247 info->status = current_run_state; 248 249 return info; 250 } 251 252 bool qemu_vmstop_requested(RunState *r) 253 { 254 qemu_mutex_lock(&vmstop_lock); 255 *r = vmstop_requested; 256 vmstop_requested = RUN_STATE__MAX; 257 qemu_mutex_unlock(&vmstop_lock); 258 return *r < RUN_STATE__MAX; 259 } 260 261 void qemu_system_vmstop_request_prepare(void) 262 { 263 qemu_mutex_lock(&vmstop_lock); 264 } 265 266 void qemu_system_vmstop_request(RunState state) 267 { 268 vmstop_requested = state; 269 qemu_mutex_unlock(&vmstop_lock); 270 qemu_notify_event(); 271 } 272 struct VMChangeStateEntry { 273 VMChangeStateHandler *cb; 274 VMChangeStateHandler *prepare_cb; 275 void *opaque; 276 QTAILQ_ENTRY(VMChangeStateEntry) entries; 277 int priority; 278 }; 279 280 static QTAILQ_HEAD(, VMChangeStateEntry) vm_change_state_head = 281 QTAILQ_HEAD_INITIALIZER(vm_change_state_head); 282 283 /** 284 * qemu_add_vm_change_state_handler_prio: 285 * @cb: the callback to invoke 286 * @opaque: user data passed to the callback 287 * @priority: low priorities execute first when the vm runs and the reverse is 288 * true when the vm stops 289 * 290 * Register a callback function that is invoked when the vm starts or stops 291 * running. 292 * 293 * Returns: an entry to be freed using qemu_del_vm_change_state_handler() 294 */ 295 VMChangeStateEntry *qemu_add_vm_change_state_handler_prio( 296 VMChangeStateHandler *cb, void *opaque, int priority) 297 { 298 return qemu_add_vm_change_state_handler_prio_full(cb, NULL, opaque, 299 priority); 300 } 301 302 /** 303 * qemu_add_vm_change_state_handler_prio_full: 304 * @cb: the main callback to invoke 305 * @prepare_cb: a callback to invoke before the main callback 306 * @opaque: user data passed to the callbacks 307 * @priority: low priorities execute first when the vm runs and the reverse is 308 * true when the vm stops 309 * 310 * Register a main callback function and an optional prepare callback function 311 * that are invoked when the vm starts or stops running. The main callback and 312 * the prepare callback are called in two separate phases: First all prepare 313 * callbacks are called and only then all main callbacks are called. As its 314 * name suggests, the prepare callback can be used to do some preparatory work 315 * before invoking the main callback. 316 * 317 * Returns: an entry to be freed using qemu_del_vm_change_state_handler() 318 */ 319 VMChangeStateEntry * 320 qemu_add_vm_change_state_handler_prio_full(VMChangeStateHandler *cb, 321 VMChangeStateHandler *prepare_cb, 322 void *opaque, int priority) 323 { 324 VMChangeStateEntry *e; 325 VMChangeStateEntry *other; 326 327 e = g_malloc0(sizeof(*e)); 328 e->cb = cb; 329 e->prepare_cb = prepare_cb; 330 e->opaque = opaque; 331 e->priority = priority; 332 333 /* Keep list sorted in ascending priority order */ 334 QTAILQ_FOREACH(other, &vm_change_state_head, entries) { 335 if (priority < other->priority) { 336 QTAILQ_INSERT_BEFORE(other, e, entries); 337 return e; 338 } 339 } 340 341 QTAILQ_INSERT_TAIL(&vm_change_state_head, e, entries); 342 return e; 343 } 344 345 VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb, 346 void *opaque) 347 { 348 return qemu_add_vm_change_state_handler_prio(cb, opaque, 0); 349 } 350 351 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e) 352 { 353 QTAILQ_REMOVE(&vm_change_state_head, e, entries); 354 g_free(e); 355 } 356 357 void vm_state_notify(bool running, RunState state) 358 { 359 VMChangeStateEntry *e, *next; 360 361 trace_vm_state_notify(running, state, RunState_str(state)); 362 363 if (running) { 364 QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) { 365 if (e->prepare_cb) { 366 e->prepare_cb(e->opaque, running, state); 367 } 368 } 369 370 QTAILQ_FOREACH_SAFE(e, &vm_change_state_head, entries, next) { 371 e->cb(e->opaque, running, state); 372 } 373 } else { 374 QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) { 375 if (e->prepare_cb) { 376 e->prepare_cb(e->opaque, running, state); 377 } 378 } 379 380 QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) { 381 e->cb(e->opaque, running, state); 382 } 383 } 384 } 385 386 static ShutdownCause reset_requested; 387 static ShutdownCause shutdown_requested; 388 static int shutdown_signal; 389 static pid_t shutdown_pid; 390 static int powerdown_requested; 391 static int debug_requested; 392 static int suspend_requested; 393 static WakeupReason wakeup_reason; 394 static NotifierList powerdown_notifiers = 395 NOTIFIER_LIST_INITIALIZER(powerdown_notifiers); 396 static NotifierList suspend_notifiers = 397 NOTIFIER_LIST_INITIALIZER(suspend_notifiers); 398 static NotifierList wakeup_notifiers = 399 NOTIFIER_LIST_INITIALIZER(wakeup_notifiers); 400 static NotifierList shutdown_notifiers = 401 NOTIFIER_LIST_INITIALIZER(shutdown_notifiers); 402 static uint32_t wakeup_reason_mask = ~(1 << QEMU_WAKEUP_REASON_NONE); 403 404 ShutdownCause qemu_shutdown_requested_get(void) 405 { 406 return shutdown_requested; 407 } 408 409 ShutdownCause qemu_reset_requested_get(void) 410 { 411 return reset_requested; 412 } 413 414 static int qemu_shutdown_requested(void) 415 { 416 return qatomic_xchg(&shutdown_requested, SHUTDOWN_CAUSE_NONE); 417 } 418 419 static void qemu_kill_report(void) 420 { 421 if (!qtest_driver() && shutdown_signal) { 422 if (shutdown_pid == 0) { 423 /* This happens for eg ^C at the terminal, so it's worth 424 * avoiding printing an odd message in that case. 425 */ 426 error_report("terminating on signal %d", shutdown_signal); 427 } else { 428 char *shutdown_cmd = qemu_get_pid_name(shutdown_pid); 429 430 error_report("terminating on signal %d from pid " FMT_pid " (%s)", 431 shutdown_signal, shutdown_pid, 432 shutdown_cmd ? shutdown_cmd : "<unknown process>"); 433 g_free(shutdown_cmd); 434 } 435 shutdown_signal = 0; 436 } 437 } 438 439 static ShutdownCause qemu_reset_requested(void) 440 { 441 ShutdownCause r = reset_requested; 442 443 if (r && replay_checkpoint(CHECKPOINT_RESET_REQUESTED)) { 444 reset_requested = SHUTDOWN_CAUSE_NONE; 445 return r; 446 } 447 return SHUTDOWN_CAUSE_NONE; 448 } 449 450 static int qemu_suspend_requested(void) 451 { 452 int r = suspend_requested; 453 if (r && replay_checkpoint(CHECKPOINT_SUSPEND_REQUESTED)) { 454 suspend_requested = 0; 455 return r; 456 } 457 return false; 458 } 459 460 static WakeupReason qemu_wakeup_requested(void) 461 { 462 return wakeup_reason; 463 } 464 465 static int qemu_powerdown_requested(void) 466 { 467 int r = powerdown_requested; 468 powerdown_requested = 0; 469 return r; 470 } 471 472 static int qemu_debug_requested(void) 473 { 474 int r = debug_requested; 475 debug_requested = 0; 476 return r; 477 } 478 479 /* 480 * Reset the VM. Issue an event unless @reason is SHUTDOWN_CAUSE_NONE. 481 */ 482 void qemu_system_reset(ShutdownCause reason) 483 { 484 MachineClass *mc; 485 486 mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL; 487 488 cpu_synchronize_all_states(); 489 490 if (mc && mc->reset) { 491 mc->reset(current_machine, reason); 492 } else { 493 qemu_devices_reset(reason); 494 } 495 switch (reason) { 496 case SHUTDOWN_CAUSE_NONE: 497 case SHUTDOWN_CAUSE_SUBSYSTEM_RESET: 498 case SHUTDOWN_CAUSE_SNAPSHOT_LOAD: 499 break; 500 default: 501 qapi_event_send_reset(shutdown_caused_by_guest(reason), reason); 502 } 503 cpu_synchronize_all_post_reset(); 504 } 505 506 /* 507 * Wake the VM after suspend. 508 */ 509 static void qemu_system_wakeup(void) 510 { 511 MachineClass *mc; 512 513 mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL; 514 515 if (mc && mc->wakeup) { 516 mc->wakeup(current_machine); 517 } 518 } 519 520 void qemu_system_guest_panicked(GuestPanicInformation *info) 521 { 522 qemu_log_mask(LOG_GUEST_ERROR, "Guest crashed"); 523 524 if (current_cpu) { 525 current_cpu->crash_occurred = true; 526 } 527 /* 528 * TODO: Currently the available panic actions are: none, pause, and 529 * shutdown, but in principle debug and reset could be supported as well. 530 * Investigate any potential use cases for the unimplemented actions. 531 */ 532 if (panic_action == PANIC_ACTION_PAUSE 533 || (panic_action == PANIC_ACTION_SHUTDOWN && shutdown_action == SHUTDOWN_ACTION_PAUSE)) { 534 qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE, info); 535 vm_stop(RUN_STATE_GUEST_PANICKED); 536 } else if (panic_action == PANIC_ACTION_SHUTDOWN || 537 panic_action == PANIC_ACTION_EXIT_FAILURE) { 538 qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_POWEROFF, info); 539 vm_stop(RUN_STATE_GUEST_PANICKED); 540 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC); 541 } else { 542 qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_RUN, info); 543 } 544 545 if (info) { 546 if (info->type == GUEST_PANIC_INFORMATION_TYPE_HYPER_V) { 547 qemu_log_mask(LOG_GUEST_ERROR, "\nHV crash parameters: (%#"PRIx64 548 " %#"PRIx64" %#"PRIx64" %#"PRIx64" %#"PRIx64")\n", 549 info->u.hyper_v.arg1, 550 info->u.hyper_v.arg2, 551 info->u.hyper_v.arg3, 552 info->u.hyper_v.arg4, 553 info->u.hyper_v.arg5); 554 } else if (info->type == GUEST_PANIC_INFORMATION_TYPE_S390) { 555 qemu_log_mask(LOG_GUEST_ERROR, " on cpu %d: %s\n" 556 "PSW: 0x%016" PRIx64 " 0x%016" PRIx64"\n", 557 info->u.s390.core, 558 S390CrashReason_str(info->u.s390.reason), 559 info->u.s390.psw_mask, 560 info->u.s390.psw_addr); 561 } 562 qapi_free_GuestPanicInformation(info); 563 } 564 } 565 566 void qemu_system_guest_crashloaded(GuestPanicInformation *info) 567 { 568 qemu_log_mask(LOG_GUEST_ERROR, "Guest crash loaded"); 569 qapi_event_send_guest_crashloaded(GUEST_PANIC_ACTION_RUN, info); 570 qapi_free_GuestPanicInformation(info); 571 } 572 573 void qemu_system_reset_request(ShutdownCause reason) 574 { 575 if (reboot_action == REBOOT_ACTION_SHUTDOWN && 576 reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) { 577 shutdown_requested = reason; 578 } else if (!cpus_are_resettable()) { 579 error_report("cpus are not resettable, terminating"); 580 shutdown_requested = reason; 581 } else { 582 reset_requested = reason; 583 } 584 cpu_stop_current(); 585 qemu_notify_event(); 586 } 587 588 static void qemu_system_suspend(void) 589 { 590 pause_all_vcpus(); 591 notifier_list_notify(&suspend_notifiers, NULL); 592 runstate_set(RUN_STATE_SUSPENDED); 593 qapi_event_send_suspend(); 594 } 595 596 void qemu_system_suspend_request(void) 597 { 598 if (runstate_check(RUN_STATE_SUSPENDED)) { 599 return; 600 } 601 suspend_requested = 1; 602 cpu_stop_current(); 603 qemu_notify_event(); 604 } 605 606 void qemu_register_suspend_notifier(Notifier *notifier) 607 { 608 notifier_list_add(&suspend_notifiers, notifier); 609 } 610 611 void qemu_system_wakeup_request(WakeupReason reason, Error **errp) 612 { 613 trace_system_wakeup_request(reason); 614 615 if (!runstate_check(RUN_STATE_SUSPENDED)) { 616 error_setg(errp, 617 "Unable to wake up: guest is not in suspended state"); 618 return; 619 } 620 if (!(wakeup_reason_mask & (1 << reason))) { 621 return; 622 } 623 runstate_set(RUN_STATE_RUNNING); 624 wakeup_reason = reason; 625 qemu_notify_event(); 626 } 627 628 void qemu_system_wakeup_enable(WakeupReason reason, bool enabled) 629 { 630 if (enabled) { 631 wakeup_reason_mask |= (1 << reason); 632 } else { 633 wakeup_reason_mask &= ~(1 << reason); 634 } 635 } 636 637 void qemu_register_wakeup_notifier(Notifier *notifier) 638 { 639 notifier_list_add(&wakeup_notifiers, notifier); 640 } 641 642 static bool wakeup_suspend_enabled; 643 644 void qemu_register_wakeup_support(void) 645 { 646 wakeup_suspend_enabled = true; 647 } 648 649 bool qemu_wakeup_suspend_enabled(void) 650 { 651 return wakeup_suspend_enabled; 652 } 653 654 void qemu_system_killed(int signal, pid_t pid) 655 { 656 shutdown_signal = signal; 657 shutdown_pid = pid; 658 shutdown_action = SHUTDOWN_ACTION_POWEROFF; 659 660 /* Cannot call qemu_system_shutdown_request directly because 661 * we are in a signal handler. 662 */ 663 shutdown_requested = SHUTDOWN_CAUSE_HOST_SIGNAL; 664 qemu_notify_event(); 665 } 666 667 void qemu_system_shutdown_request(ShutdownCause reason) 668 { 669 trace_qemu_system_shutdown_request(reason); 670 replay_shutdown_request(reason); 671 shutdown_requested = reason; 672 qemu_notify_event(); 673 } 674 675 static void qemu_system_powerdown(void) 676 { 677 qapi_event_send_powerdown(); 678 notifier_list_notify(&powerdown_notifiers, NULL); 679 } 680 681 static void qemu_system_shutdown(ShutdownCause cause) 682 { 683 qapi_event_send_shutdown(shutdown_caused_by_guest(cause), cause); 684 notifier_list_notify(&shutdown_notifiers, &cause); 685 } 686 687 void qemu_system_powerdown_request(void) 688 { 689 trace_qemu_system_powerdown_request(); 690 powerdown_requested = 1; 691 qemu_notify_event(); 692 } 693 694 void qemu_register_powerdown_notifier(Notifier *notifier) 695 { 696 notifier_list_add(&powerdown_notifiers, notifier); 697 } 698 699 void qemu_register_shutdown_notifier(Notifier *notifier) 700 { 701 notifier_list_add(&shutdown_notifiers, notifier); 702 } 703 704 void qemu_system_debug_request(void) 705 { 706 debug_requested = 1; 707 qemu_notify_event(); 708 } 709 710 static bool main_loop_should_exit(int *status) 711 { 712 RunState r; 713 ShutdownCause request; 714 715 if (qemu_debug_requested()) { 716 vm_stop(RUN_STATE_DEBUG); 717 } 718 if (qemu_suspend_requested()) { 719 qemu_system_suspend(); 720 } 721 request = qemu_shutdown_requested(); 722 if (request) { 723 qemu_kill_report(); 724 qemu_system_shutdown(request); 725 if (shutdown_action == SHUTDOWN_ACTION_PAUSE) { 726 vm_stop(RUN_STATE_SHUTDOWN); 727 } else { 728 if (request == SHUTDOWN_CAUSE_GUEST_PANIC && 729 panic_action == PANIC_ACTION_EXIT_FAILURE) { 730 *status = EXIT_FAILURE; 731 } 732 return true; 733 } 734 } 735 request = qemu_reset_requested(); 736 if (request) { 737 pause_all_vcpus(); 738 qemu_system_reset(request); 739 resume_all_vcpus(); 740 /* 741 * runstate can change in pause_all_vcpus() 742 * as iothread mutex is unlocked 743 */ 744 if (!runstate_check(RUN_STATE_RUNNING) && 745 !runstate_check(RUN_STATE_INMIGRATE) && 746 !runstate_check(RUN_STATE_FINISH_MIGRATE)) { 747 runstate_set(RUN_STATE_PRELAUNCH); 748 } 749 } 750 if (qemu_wakeup_requested()) { 751 pause_all_vcpus(); 752 qemu_system_wakeup(); 753 notifier_list_notify(&wakeup_notifiers, &wakeup_reason); 754 wakeup_reason = QEMU_WAKEUP_REASON_NONE; 755 resume_all_vcpus(); 756 qapi_event_send_wakeup(); 757 } 758 if (qemu_powerdown_requested()) { 759 qemu_system_powerdown(); 760 } 761 if (qemu_vmstop_requested(&r)) { 762 vm_stop(r); 763 } 764 return false; 765 } 766 767 int qemu_main_loop(void) 768 { 769 int status = EXIT_SUCCESS; 770 771 while (!main_loop_should_exit(&status)) { 772 main_loop_wait(false); 773 } 774 775 return status; 776 } 777 778 void qemu_add_exit_notifier(Notifier *notify) 779 { 780 notifier_list_add(&exit_notifiers, notify); 781 } 782 783 void qemu_remove_exit_notifier(Notifier *notify) 784 { 785 notifier_remove(notify); 786 } 787 788 static void qemu_run_exit_notifiers(void) 789 { 790 notifier_list_notify(&exit_notifiers, NULL); 791 } 792 793 void qemu_init_subsystems(void) 794 { 795 Error *err = NULL; 796 797 os_set_line_buffering(); 798 799 module_call_init(MODULE_INIT_TRACE); 800 801 qemu_init_cpu_list(); 802 qemu_init_cpu_loop(); 803 qemu_mutex_lock_iothread(); 804 805 atexit(qemu_run_exit_notifiers); 806 807 module_call_init(MODULE_INIT_QOM); 808 module_call_init(MODULE_INIT_MIGRATION); 809 810 runstate_init(); 811 precopy_infrastructure_init(); 812 postcopy_infrastructure_init(); 813 monitor_init_globals(); 814 815 if (qcrypto_init(&err) < 0) { 816 error_reportf_err(err, "cannot initialize crypto: "); 817 exit(1); 818 } 819 820 os_setup_early_signal_handling(); 821 822 bdrv_init_with_whitelist(); 823 socket_init(); 824 } 825 826 827 void qemu_cleanup(void) 828 { 829 gdb_exit(0); 830 831 /* 832 * cleaning up the migration object cancels any existing migration 833 * try to do this early so that it also stops using devices. 834 */ 835 migration_shutdown(); 836 837 /* 838 * Close the exports before draining the block layer. The export 839 * drivers may have coroutines yielding on it, so we need to clean 840 * them up before the drain, as otherwise they may be get stuck in 841 * blk_wait_while_drained(). 842 */ 843 blk_exp_close_all(); 844 845 846 /* No more vcpu or device emulation activity beyond this point */ 847 vm_shutdown(); 848 replay_finish(); 849 850 /* 851 * We must cancel all block jobs while the block layer is drained, 852 * or cancelling will be affected by throttling and thus may block 853 * for an extended period of time. 854 * Begin the drained section after vm_shutdown() to avoid requests being 855 * stuck in the BlockBackend's request queue. 856 * We do not need to end this section, because we do not want any 857 * requests happening from here on anyway. 858 */ 859 bdrv_drain_all_begin(); 860 job_cancel_sync_all(); 861 bdrv_close_all(); 862 863 /* vhost-user must be cleaned up before chardevs. */ 864 tpm_cleanup(); 865 net_cleanup(); 866 audio_cleanup(); 867 monitor_cleanup(); 868 qemu_chr_cleanup(); 869 user_creatable_cleanup(); 870 /* TODO: unref root container, check all devices are ok */ 871 } 872