Merge remote-tracking branch 'remotes/cschoenebeck/tags/pull-9p-20211027' into staging
[qemu.git] / 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;
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 }