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 "hw/resettable.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/accel.h" 45 #include "qemu/error-report.h" 46 #include "qemu/job.h" 47 #include "qemu/log.h" 48 #include "qemu/module.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 "system/cpus.h" 55 #include "system/qtest.h" 56 #include "system/replay.h" 57 #include "system/reset.h" 58 #include "system/runstate.h" 59 #include "system/runstate-action.h" 60 #include "system/system.h" 61 #include "system/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 { RUN_STATE_PRELAUNCH, RUN_STATE_SUSPENDED }, 81 82 { RUN_STATE_DEBUG, RUN_STATE_RUNNING }, 83 { RUN_STATE_DEBUG, RUN_STATE_FINISH_MIGRATE }, 84 { RUN_STATE_DEBUG, RUN_STATE_PRELAUNCH }, 85 86 { RUN_STATE_INMIGRATE, RUN_STATE_INTERNAL_ERROR }, 87 { RUN_STATE_INMIGRATE, RUN_STATE_IO_ERROR }, 88 { RUN_STATE_INMIGRATE, RUN_STATE_PAUSED }, 89 { RUN_STATE_INMIGRATE, RUN_STATE_RUNNING }, 90 { RUN_STATE_INMIGRATE, RUN_STATE_SHUTDOWN }, 91 { RUN_STATE_INMIGRATE, RUN_STATE_SUSPENDED }, 92 { RUN_STATE_INMIGRATE, RUN_STATE_WATCHDOG }, 93 { RUN_STATE_INMIGRATE, RUN_STATE_GUEST_PANICKED }, 94 { RUN_STATE_INMIGRATE, RUN_STATE_FINISH_MIGRATE }, 95 { RUN_STATE_INMIGRATE, RUN_STATE_PRELAUNCH }, 96 { RUN_STATE_INMIGRATE, RUN_STATE_POSTMIGRATE }, 97 { RUN_STATE_INMIGRATE, RUN_STATE_COLO }, 98 99 { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PAUSED }, 100 { RUN_STATE_INTERNAL_ERROR, RUN_STATE_FINISH_MIGRATE }, 101 { RUN_STATE_INTERNAL_ERROR, RUN_STATE_PRELAUNCH }, 102 103 { RUN_STATE_IO_ERROR, RUN_STATE_RUNNING }, 104 { RUN_STATE_IO_ERROR, RUN_STATE_FINISH_MIGRATE }, 105 { RUN_STATE_IO_ERROR, RUN_STATE_PRELAUNCH }, 106 107 { RUN_STATE_PAUSED, RUN_STATE_RUNNING }, 108 { RUN_STATE_PAUSED, RUN_STATE_FINISH_MIGRATE }, 109 { RUN_STATE_PAUSED, RUN_STATE_POSTMIGRATE }, 110 { RUN_STATE_PAUSED, RUN_STATE_PRELAUNCH }, 111 { RUN_STATE_PAUSED, RUN_STATE_COLO}, 112 { RUN_STATE_PAUSED, RUN_STATE_SUSPENDED}, 113 114 { RUN_STATE_POSTMIGRATE, RUN_STATE_RUNNING }, 115 { RUN_STATE_POSTMIGRATE, RUN_STATE_FINISH_MIGRATE }, 116 { RUN_STATE_POSTMIGRATE, RUN_STATE_PRELAUNCH }, 117 118 { RUN_STATE_PRELAUNCH, RUN_STATE_RUNNING }, 119 { RUN_STATE_PRELAUNCH, RUN_STATE_FINISH_MIGRATE }, 120 { RUN_STATE_PRELAUNCH, RUN_STATE_INMIGRATE }, 121 122 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_RUNNING }, 123 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_PAUSED }, 124 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_POSTMIGRATE }, 125 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_PRELAUNCH }, 126 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_COLO }, 127 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_INTERNAL_ERROR }, 128 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_IO_ERROR }, 129 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_SHUTDOWN }, 130 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_SUSPENDED }, 131 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_WATCHDOG }, 132 { RUN_STATE_FINISH_MIGRATE, RUN_STATE_GUEST_PANICKED }, 133 134 { RUN_STATE_RESTORE_VM, RUN_STATE_RUNNING }, 135 { RUN_STATE_RESTORE_VM, RUN_STATE_PRELAUNCH }, 136 { RUN_STATE_RESTORE_VM, RUN_STATE_SUSPENDED }, 137 138 { RUN_STATE_COLO, RUN_STATE_RUNNING }, 139 { RUN_STATE_COLO, RUN_STATE_PRELAUNCH }, 140 { RUN_STATE_COLO, RUN_STATE_SHUTDOWN}, 141 142 { RUN_STATE_RUNNING, RUN_STATE_DEBUG }, 143 { RUN_STATE_RUNNING, RUN_STATE_INTERNAL_ERROR }, 144 { RUN_STATE_RUNNING, RUN_STATE_IO_ERROR }, 145 { RUN_STATE_RUNNING, RUN_STATE_PAUSED }, 146 { RUN_STATE_RUNNING, RUN_STATE_FINISH_MIGRATE }, 147 { RUN_STATE_RUNNING, RUN_STATE_RESTORE_VM }, 148 { RUN_STATE_RUNNING, RUN_STATE_SAVE_VM }, 149 { RUN_STATE_RUNNING, RUN_STATE_SHUTDOWN }, 150 { RUN_STATE_RUNNING, RUN_STATE_WATCHDOG }, 151 { RUN_STATE_RUNNING, RUN_STATE_GUEST_PANICKED }, 152 { RUN_STATE_RUNNING, RUN_STATE_COLO}, 153 154 { RUN_STATE_SAVE_VM, RUN_STATE_RUNNING }, 155 { RUN_STATE_SAVE_VM, RUN_STATE_SUSPENDED }, 156 157 { RUN_STATE_SHUTDOWN, RUN_STATE_PAUSED }, 158 { RUN_STATE_SHUTDOWN, RUN_STATE_FINISH_MIGRATE }, 159 { RUN_STATE_SHUTDOWN, RUN_STATE_PRELAUNCH }, 160 { RUN_STATE_SHUTDOWN, RUN_STATE_COLO }, 161 162 { RUN_STATE_DEBUG, RUN_STATE_SUSPENDED }, 163 { RUN_STATE_RUNNING, RUN_STATE_SUSPENDED }, 164 { RUN_STATE_SUSPENDED, RUN_STATE_RUNNING }, 165 { RUN_STATE_SUSPENDED, RUN_STATE_FINISH_MIGRATE }, 166 { RUN_STATE_SUSPENDED, RUN_STATE_PRELAUNCH }, 167 { RUN_STATE_SUSPENDED, RUN_STATE_COLO}, 168 { RUN_STATE_SUSPENDED, RUN_STATE_PAUSED}, 169 { RUN_STATE_SUSPENDED, RUN_STATE_SAVE_VM }, 170 { RUN_STATE_SUSPENDED, RUN_STATE_RESTORE_VM }, 171 { RUN_STATE_SUSPENDED, RUN_STATE_SHUTDOWN }, 172 173 { RUN_STATE_WATCHDOG, RUN_STATE_RUNNING }, 174 { RUN_STATE_WATCHDOG, RUN_STATE_FINISH_MIGRATE }, 175 { RUN_STATE_WATCHDOG, RUN_STATE_PRELAUNCH }, 176 { RUN_STATE_WATCHDOG, RUN_STATE_COLO}, 177 178 { RUN_STATE_GUEST_PANICKED, RUN_STATE_RUNNING }, 179 { RUN_STATE_GUEST_PANICKED, RUN_STATE_FINISH_MIGRATE }, 180 { RUN_STATE_GUEST_PANICKED, RUN_STATE_PRELAUNCH }, 181 182 { RUN_STATE__MAX, RUN_STATE__MAX }, 183 }; 184 185 static const RunStateTransition replay_play_runstate_transitions_def[] = { 186 { RUN_STATE_SHUTDOWN, RUN_STATE_RUNNING}, 187 188 { RUN_STATE__MAX, RUN_STATE__MAX }, 189 }; 190 191 static bool runstate_valid_transitions[RUN_STATE__MAX][RUN_STATE__MAX]; 192 193 bool runstate_check(RunState state) 194 { 195 return current_run_state == state; 196 } 197 198 static void transitions_set_valid(const RunStateTransition *rst) 199 { 200 const RunStateTransition *p; 201 202 for (p = rst; p->from != RUN_STATE__MAX; p++) { 203 runstate_valid_transitions[p->from][p->to] = true; 204 } 205 } 206 207 void runstate_replay_enable(void) 208 { 209 assert(replay_mode != REPLAY_MODE_NONE); 210 211 if (replay_mode == REPLAY_MODE_PLAY) { 212 /* 213 * When reverse-debugging, it is possible to move state from 214 * shutdown to running. 215 */ 216 transitions_set_valid(&replay_play_runstate_transitions_def[0]); 217 } 218 } 219 220 static void runstate_init(void) 221 { 222 memset(&runstate_valid_transitions, 0, sizeof(runstate_valid_transitions)); 223 224 transitions_set_valid(&runstate_transitions_def[0]); 225 226 qemu_mutex_init(&vmstop_lock); 227 } 228 229 /* This function will abort() on invalid state transitions */ 230 void runstate_set(RunState new_state) 231 { 232 assert(new_state < RUN_STATE__MAX); 233 234 trace_runstate_set(current_run_state, RunState_str(current_run_state), 235 new_state, RunState_str(new_state)); 236 237 if (current_run_state == new_state) { 238 return; 239 } 240 241 if (!runstate_valid_transitions[current_run_state][new_state]) { 242 error_report("invalid runstate transition: '%s' -> '%s'", 243 RunState_str(current_run_state), 244 RunState_str(new_state)); 245 abort(); 246 } 247 248 current_run_state = new_state; 249 } 250 251 RunState runstate_get(void) 252 { 253 return current_run_state; 254 } 255 256 bool runstate_is_running(void) 257 { 258 return runstate_check(RUN_STATE_RUNNING); 259 } 260 261 bool runstate_needs_reset(void) 262 { 263 return runstate_check(RUN_STATE_INTERNAL_ERROR) || 264 runstate_check(RUN_STATE_SHUTDOWN); 265 } 266 267 StatusInfo *qmp_query_status(Error **errp) 268 { 269 StatusInfo *info = g_malloc0(sizeof(*info)); 270 271 info->running = runstate_is_running(); 272 info->status = current_run_state; 273 274 return info; 275 } 276 277 bool qemu_vmstop_requested(RunState *r) 278 { 279 qemu_mutex_lock(&vmstop_lock); 280 *r = vmstop_requested; 281 vmstop_requested = RUN_STATE__MAX; 282 qemu_mutex_unlock(&vmstop_lock); 283 return *r < RUN_STATE__MAX; 284 } 285 286 void qemu_system_vmstop_request_prepare(void) 287 { 288 qemu_mutex_lock(&vmstop_lock); 289 } 290 291 void qemu_system_vmstop_request(RunState state) 292 { 293 vmstop_requested = state; 294 qemu_mutex_unlock(&vmstop_lock); 295 qemu_notify_event(); 296 } 297 struct VMChangeStateEntry { 298 VMChangeStateHandler *cb; 299 VMChangeStateHandler *prepare_cb; 300 VMChangeStateHandlerWithRet *cb_ret; 301 void *opaque; 302 QTAILQ_ENTRY(VMChangeStateEntry) entries; 303 int priority; 304 }; 305 306 static QTAILQ_HEAD(, VMChangeStateEntry) vm_change_state_head = 307 QTAILQ_HEAD_INITIALIZER(vm_change_state_head); 308 309 VMChangeStateEntry *qemu_add_vm_change_state_handler_prio( 310 VMChangeStateHandler *cb, void *opaque, int priority) 311 { 312 return qemu_add_vm_change_state_handler_prio_full(cb, NULL, NULL, 313 opaque, priority); 314 } 315 316 VMChangeStateEntry * 317 qemu_add_vm_change_state_handler_prio_full(VMChangeStateHandler *cb, 318 VMChangeStateHandler *prepare_cb, 319 VMChangeStateHandlerWithRet *cb_ret, 320 void *opaque, int priority) 321 { 322 VMChangeStateEntry *e; 323 VMChangeStateEntry *other; 324 325 e = g_malloc0(sizeof(*e)); 326 e->cb = cb; 327 e->prepare_cb = prepare_cb; 328 e->cb_ret = cb_ret; 329 e->opaque = opaque; 330 e->priority = priority; 331 332 /* Keep list sorted in ascending priority order */ 333 QTAILQ_FOREACH(other, &vm_change_state_head, entries) { 334 if (priority < other->priority) { 335 QTAILQ_INSERT_BEFORE(other, e, entries); 336 return e; 337 } 338 } 339 340 QTAILQ_INSERT_TAIL(&vm_change_state_head, e, entries); 341 return e; 342 } 343 344 VMChangeStateEntry *qemu_add_vm_change_state_handler(VMChangeStateHandler *cb, 345 void *opaque) 346 { 347 return qemu_add_vm_change_state_handler_prio(cb, opaque, 0); 348 } 349 350 void qemu_del_vm_change_state_handler(VMChangeStateEntry *e) 351 { 352 QTAILQ_REMOVE(&vm_change_state_head, e, entries); 353 g_free(e); 354 } 355 356 int vm_state_notify(bool running, RunState state) 357 { 358 VMChangeStateEntry *e, *next; 359 int ret = 0; 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 if (e->cb) { 372 e->cb(e->opaque, running, state); 373 } else if (e->cb_ret) { 374 /* 375 * Here ignore the return value of cb_ret because 376 * we only care about the stopping the device during 377 * the VM live migration to indicate whether the 378 * connection between qemu and backend is normal. 379 */ 380 e->cb_ret(e->opaque, running, state); 381 } 382 } 383 } else { 384 QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) { 385 if (e->prepare_cb) { 386 e->prepare_cb(e->opaque, running, state); 387 } 388 } 389 390 QTAILQ_FOREACH_REVERSE_SAFE(e, &vm_change_state_head, entries, next) { 391 if (e->cb) { 392 e->cb(e->opaque, running, state); 393 } else if (e->cb_ret) { 394 /* 395 * We should execute all registered callbacks even if 396 * one of them returns failure, otherwise, some cleanup 397 * work of the device will be skipped. 398 */ 399 ret |= e->cb_ret(e->opaque, running, state); 400 } 401 } 402 } 403 return ret; 404 } 405 406 static ShutdownCause reset_requested; 407 static ShutdownCause shutdown_requested; 408 static int shutdown_exit_code = EXIT_SUCCESS; 409 static int shutdown_signal; 410 static bool force_shutdown; 411 static pid_t shutdown_pid; 412 static int powerdown_requested; 413 static int debug_requested; 414 static int suspend_requested; 415 static WakeupReason wakeup_reason; 416 static NotifierList powerdown_notifiers = 417 NOTIFIER_LIST_INITIALIZER(powerdown_notifiers); 418 static NotifierList suspend_notifiers = 419 NOTIFIER_LIST_INITIALIZER(suspend_notifiers); 420 static NotifierList wakeup_notifiers = 421 NOTIFIER_LIST_INITIALIZER(wakeup_notifiers); 422 static NotifierList shutdown_notifiers = 423 NOTIFIER_LIST_INITIALIZER(shutdown_notifiers); 424 static uint32_t wakeup_reason_mask = ~(1 << QEMU_WAKEUP_REASON_NONE); 425 426 ShutdownCause qemu_shutdown_requested_get(void) 427 { 428 return shutdown_requested; 429 } 430 431 bool qemu_force_shutdown_requested(void) 432 { 433 return force_shutdown; 434 } 435 436 ShutdownCause qemu_reset_requested_get(void) 437 { 438 return reset_requested; 439 } 440 441 static int qemu_shutdown_requested(void) 442 { 443 return qatomic_xchg(&shutdown_requested, SHUTDOWN_CAUSE_NONE); 444 } 445 446 static void qemu_kill_report(void) 447 { 448 if (!qtest_driver() && shutdown_signal) { 449 if (shutdown_pid == 0) { 450 /* This happens for eg ^C at the terminal, so it's worth 451 * avoiding printing an odd message in that case. 452 */ 453 error_report("terminating on signal %d", shutdown_signal); 454 } else { 455 char *shutdown_cmd = qemu_get_pid_name(shutdown_pid); 456 457 error_report("terminating on signal %d from pid " FMT_pid " (%s)", 458 shutdown_signal, shutdown_pid, 459 shutdown_cmd ? shutdown_cmd : "<unknown process>"); 460 g_free(shutdown_cmd); 461 } 462 shutdown_signal = 0; 463 } 464 } 465 466 static ShutdownCause qemu_reset_requested(void) 467 { 468 ShutdownCause r = reset_requested; 469 470 if (r && replay_checkpoint(CHECKPOINT_RESET_REQUESTED)) { 471 reset_requested = SHUTDOWN_CAUSE_NONE; 472 return r; 473 } 474 return SHUTDOWN_CAUSE_NONE; 475 } 476 477 static int qemu_suspend_requested(void) 478 { 479 int r = suspend_requested; 480 if (r && replay_checkpoint(CHECKPOINT_SUSPEND_REQUESTED)) { 481 suspend_requested = 0; 482 return r; 483 } 484 return false; 485 } 486 487 static WakeupReason qemu_wakeup_requested(void) 488 { 489 return wakeup_reason; 490 } 491 492 static int qemu_powerdown_requested(void) 493 { 494 int r = powerdown_requested; 495 powerdown_requested = 0; 496 return r; 497 } 498 499 static int qemu_debug_requested(void) 500 { 501 int r = debug_requested; 502 debug_requested = 0; 503 return r; 504 } 505 506 /* 507 * Reset the VM. Issue an event unless @reason is SHUTDOWN_CAUSE_NONE. 508 */ 509 void qemu_system_reset(ShutdownCause reason) 510 { 511 MachineClass *mc; 512 ResetType type; 513 514 mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL; 515 516 cpu_synchronize_all_states(); 517 518 switch (reason) { 519 case SHUTDOWN_CAUSE_SNAPSHOT_LOAD: 520 type = RESET_TYPE_SNAPSHOT_LOAD; 521 break; 522 default: 523 type = RESET_TYPE_COLD; 524 } 525 if (mc && mc->reset) { 526 mc->reset(current_machine, type); 527 } else { 528 qemu_devices_reset(type); 529 } 530 switch (reason) { 531 case SHUTDOWN_CAUSE_NONE: 532 case SHUTDOWN_CAUSE_SUBSYSTEM_RESET: 533 case SHUTDOWN_CAUSE_SNAPSHOT_LOAD: 534 break; 535 default: 536 qapi_event_send_reset(shutdown_caused_by_guest(reason), reason); 537 } 538 539 /* 540 * Some boards use the machine reset callback to point CPUs to the firmware 541 * entry point. Assume that this is not the case for boards that support 542 * non-resettable CPUs (currently used only for confidential guests), in 543 * which case cpu_synchronize_all_post_init() is enough because 544 * it does _more_ than cpu_synchronize_all_post_reset(). 545 */ 546 if (cpus_are_resettable()) { 547 cpu_synchronize_all_post_reset(); 548 } else { 549 assert(runstate_check(RUN_STATE_PRELAUNCH)); 550 } 551 552 vm_set_suspended(false); 553 } 554 555 /* 556 * Wake the VM after suspend. 557 */ 558 static void qemu_system_wakeup(void) 559 { 560 MachineClass *mc; 561 562 mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL; 563 564 if (mc && mc->wakeup) { 565 mc->wakeup(current_machine); 566 } 567 } 568 569 static char *tdx_parse_panic_message(char *message) 570 { 571 bool printable = false; 572 char *buf = NULL; 573 int len = 0, i; 574 575 /* 576 * Although message is defined as a json string, we shouldn't 577 * unconditionally treat it as is because the guest generated it and 578 * it's not necessarily trustable. 579 */ 580 if (message) { 581 /* The caller guarantees the NULL-terminated string. */ 582 len = strlen(message); 583 584 printable = len > 0; 585 for (i = 0; i < len; i++) { 586 if (!(0x20 <= message[i] && message[i] <= 0x7e)) { 587 printable = false; 588 break; 589 } 590 } 591 } 592 593 if (len == 0) { 594 buf = g_malloc(1); 595 buf[0] = '\0'; 596 } else { 597 if (!printable) { 598 /* 3 = length of "%02x " */ 599 buf = g_malloc(len * 3); 600 for (i = 0; i < len; i++) { 601 if (message[i] == '\0') { 602 break; 603 } else { 604 sprintf(buf + 3 * i, "%02x ", message[i]); 605 } 606 } 607 if (i > 0) { 608 /* replace the last ' '(space) to NULL */ 609 buf[i * 3 - 1] = '\0'; 610 } else { 611 buf[0] = '\0'; 612 } 613 } else { 614 buf = g_strdup(message); 615 } 616 } 617 618 return buf; 619 } 620 621 void qemu_system_guest_panicked(GuestPanicInformation *info) 622 { 623 qemu_log_mask(LOG_GUEST_ERROR, "Guest crashed"); 624 625 if (current_cpu) { 626 current_cpu->crash_occurred = true; 627 } 628 /* 629 * TODO: Currently the available panic actions are: none, pause, and 630 * shutdown, but in principle debug and reset could be supported as well. 631 * Investigate any potential use cases for the unimplemented actions. 632 */ 633 if (panic_action == PANIC_ACTION_PAUSE 634 || (panic_action == PANIC_ACTION_SHUTDOWN && shutdown_action == SHUTDOWN_ACTION_PAUSE)) { 635 qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_PAUSE, info); 636 vm_stop(RUN_STATE_GUEST_PANICKED); 637 } else if (panic_action == PANIC_ACTION_SHUTDOWN || 638 panic_action == PANIC_ACTION_EXIT_FAILURE) { 639 qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_POWEROFF, info); 640 vm_stop(RUN_STATE_GUEST_PANICKED); 641 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_PANIC); 642 } else { 643 qapi_event_send_guest_panicked(GUEST_PANIC_ACTION_RUN, info); 644 } 645 646 if (info) { 647 if (info->type == GUEST_PANIC_INFORMATION_TYPE_HYPER_V) { 648 qemu_log_mask(LOG_GUEST_ERROR, "\nHV crash parameters: (%#"PRIx64 649 " %#"PRIx64" %#"PRIx64" %#"PRIx64" %#"PRIx64")\n", 650 info->u.hyper_v.arg1, 651 info->u.hyper_v.arg2, 652 info->u.hyper_v.arg3, 653 info->u.hyper_v.arg4, 654 info->u.hyper_v.arg5); 655 } else if (info->type == GUEST_PANIC_INFORMATION_TYPE_S390) { 656 qemu_log_mask(LOG_GUEST_ERROR, " on cpu %d: %s\n" 657 "PSW: 0x%016" PRIx64 " 0x%016" PRIx64"\n", 658 info->u.s390.core, 659 S390CrashReason_str(info->u.s390.reason), 660 info->u.s390.psw_mask, 661 info->u.s390.psw_addr); 662 } else if (info->type == GUEST_PANIC_INFORMATION_TYPE_TDX) { 663 char *message = tdx_parse_panic_message(info->u.tdx.message); 664 qemu_log_mask(LOG_GUEST_ERROR, 665 "\nTDX guest reports fatal error." 666 " error code: 0x%" PRIx32 " error message:\"%s\"\n", 667 info->u.tdx.error_code, message); 668 g_free(message); 669 if (info->u.tdx.gpa != -1ull) { 670 qemu_log_mask(LOG_GUEST_ERROR, "Additional error information " 671 "can be found at gpa page: 0x%" PRIx64 "\n", 672 info->u.tdx.gpa); 673 } 674 } 675 676 qapi_free_GuestPanicInformation(info); 677 } 678 } 679 680 void qemu_system_guest_crashloaded(GuestPanicInformation *info) 681 { 682 qemu_log_mask(LOG_GUEST_ERROR, "Guest crash loaded"); 683 qapi_event_send_guest_crashloaded(GUEST_PANIC_ACTION_RUN, info); 684 qapi_free_GuestPanicInformation(info); 685 } 686 687 void qemu_system_guest_pvshutdown(void) 688 { 689 qapi_event_send_guest_pvshutdown(); 690 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 691 } 692 693 void qemu_system_reset_request(ShutdownCause reason) 694 { 695 if (reboot_action == REBOOT_ACTION_SHUTDOWN && 696 reason != SHUTDOWN_CAUSE_SUBSYSTEM_RESET) { 697 shutdown_requested = reason; 698 } else if (!cpus_are_resettable()) { 699 error_report("cpus are not resettable, terminating"); 700 shutdown_requested = reason; 701 } else { 702 reset_requested = reason; 703 } 704 cpu_stop_current(); 705 qemu_notify_event(); 706 } 707 708 static void qemu_system_suspend(void) 709 { 710 pause_all_vcpus(); 711 notifier_list_notify(&suspend_notifiers, NULL); 712 runstate_set(RUN_STATE_SUSPENDED); 713 qapi_event_send_suspend(); 714 } 715 716 void qemu_system_suspend_request(void) 717 { 718 if (runstate_check(RUN_STATE_SUSPENDED)) { 719 return; 720 } 721 suspend_requested = 1; 722 cpu_stop_current(); 723 qemu_notify_event(); 724 } 725 726 void qemu_register_suspend_notifier(Notifier *notifier) 727 { 728 notifier_list_add(&suspend_notifiers, notifier); 729 } 730 731 void qemu_system_wakeup_request(WakeupReason reason, Error **errp) 732 { 733 trace_system_wakeup_request(reason); 734 735 if (!runstate_check(RUN_STATE_SUSPENDED)) { 736 error_setg(errp, 737 "Unable to wake up: guest is not in suspended state"); 738 return; 739 } 740 if (!(wakeup_reason_mask & (1 << reason))) { 741 return; 742 } 743 runstate_set(RUN_STATE_RUNNING); 744 wakeup_reason = reason; 745 qemu_notify_event(); 746 } 747 748 void qemu_system_wakeup_enable(WakeupReason reason, bool enabled) 749 { 750 if (enabled) { 751 wakeup_reason_mask |= (1 << reason); 752 } else { 753 wakeup_reason_mask &= ~(1 << reason); 754 } 755 } 756 757 void qemu_register_wakeup_notifier(Notifier *notifier) 758 { 759 notifier_list_add(&wakeup_notifiers, notifier); 760 } 761 762 static bool wakeup_suspend_enabled; 763 764 void qemu_register_wakeup_support(void) 765 { 766 wakeup_suspend_enabled = true; 767 } 768 769 bool qemu_wakeup_suspend_enabled(void) 770 { 771 return wakeup_suspend_enabled; 772 } 773 774 void qemu_system_killed(int signal, pid_t pid) 775 { 776 shutdown_signal = signal; 777 shutdown_pid = pid; 778 shutdown_action = SHUTDOWN_ACTION_POWEROFF; 779 780 /* Cannot call qemu_system_shutdown_request directly because 781 * we are in a signal handler. 782 */ 783 shutdown_requested = SHUTDOWN_CAUSE_HOST_SIGNAL; 784 force_shutdown = true; 785 qemu_notify_event(); 786 } 787 788 void qemu_system_shutdown_request_with_code(ShutdownCause reason, 789 int exit_code) 790 { 791 shutdown_exit_code = exit_code; 792 qemu_system_shutdown_request(reason); 793 } 794 795 void qemu_system_shutdown_request(ShutdownCause reason) 796 { 797 trace_qemu_system_shutdown_request(reason); 798 replay_shutdown_request(reason); 799 shutdown_requested = reason; 800 if (reason == SHUTDOWN_CAUSE_HOST_QMP_QUIT) { 801 force_shutdown = true; 802 } 803 qemu_notify_event(); 804 } 805 806 static void qemu_system_powerdown(void) 807 { 808 qapi_event_send_powerdown(); 809 notifier_list_notify(&powerdown_notifiers, NULL); 810 } 811 812 static void qemu_system_shutdown(ShutdownCause cause) 813 { 814 qapi_event_send_shutdown(shutdown_caused_by_guest(cause), cause); 815 notifier_list_notify(&shutdown_notifiers, &cause); 816 } 817 818 void qemu_system_powerdown_request(void) 819 { 820 trace_qemu_system_powerdown_request(); 821 powerdown_requested = 1; 822 qemu_notify_event(); 823 } 824 825 void qemu_register_powerdown_notifier(Notifier *notifier) 826 { 827 notifier_list_add(&powerdown_notifiers, notifier); 828 } 829 830 void qemu_register_shutdown_notifier(Notifier *notifier) 831 { 832 notifier_list_add(&shutdown_notifiers, notifier); 833 } 834 835 void qemu_system_debug_request(void) 836 { 837 debug_requested = 1; 838 qemu_notify_event(); 839 } 840 841 static bool main_loop_should_exit(int *status) 842 { 843 RunState r; 844 ShutdownCause request; 845 846 if (qemu_debug_requested()) { 847 vm_stop(RUN_STATE_DEBUG); 848 } 849 if (qemu_suspend_requested()) { 850 qemu_system_suspend(); 851 } 852 request = qemu_shutdown_requested(); 853 if (request) { 854 qemu_kill_report(); 855 qemu_system_shutdown(request); 856 if (shutdown_action == SHUTDOWN_ACTION_PAUSE) { 857 vm_stop(RUN_STATE_SHUTDOWN); 858 } else { 859 if (shutdown_exit_code != EXIT_SUCCESS) { 860 *status = shutdown_exit_code; 861 } else if (request == SHUTDOWN_CAUSE_GUEST_PANIC && 862 panic_action == PANIC_ACTION_EXIT_FAILURE) { 863 *status = EXIT_FAILURE; 864 } 865 return true; 866 } 867 } 868 request = qemu_reset_requested(); 869 if (request) { 870 pause_all_vcpus(); 871 qemu_system_reset(request); 872 resume_all_vcpus(); 873 /* 874 * runstate can change in pause_all_vcpus() 875 * as iothread mutex is unlocked 876 */ 877 if (!runstate_check(RUN_STATE_RUNNING) && 878 !runstate_check(RUN_STATE_INMIGRATE) && 879 !runstate_check(RUN_STATE_FINISH_MIGRATE)) { 880 runstate_set(RUN_STATE_PRELAUNCH); 881 } 882 } 883 if (qemu_wakeup_requested()) { 884 pause_all_vcpus(); 885 qemu_system_wakeup(); 886 notifier_list_notify(&wakeup_notifiers, &wakeup_reason); 887 wakeup_reason = QEMU_WAKEUP_REASON_NONE; 888 resume_all_vcpus(); 889 qapi_event_send_wakeup(); 890 } 891 if (qemu_powerdown_requested()) { 892 qemu_system_powerdown(); 893 } 894 if (qemu_vmstop_requested(&r)) { 895 vm_stop(r); 896 } 897 return false; 898 } 899 900 int qemu_main_loop(void) 901 { 902 int status = EXIT_SUCCESS; 903 904 while (!main_loop_should_exit(&status)) { 905 main_loop_wait(false); 906 } 907 908 return status; 909 } 910 911 void qemu_add_exit_notifier(Notifier *notify) 912 { 913 notifier_list_add(&exit_notifiers, notify); 914 } 915 916 void qemu_remove_exit_notifier(Notifier *notify) 917 { 918 notifier_remove(notify); 919 } 920 921 static void qemu_run_exit_notifiers(void) 922 { 923 BQL_LOCK_GUARD(); 924 notifier_list_notify(&exit_notifiers, NULL); 925 } 926 927 void qemu_init_subsystems(void) 928 { 929 Error *err = NULL; 930 931 os_set_line_buffering(); 932 933 module_call_init(MODULE_INIT_TRACE); 934 935 qemu_init_cpu_list(); 936 qemu_init_cpu_loop(); 937 bql_lock(); 938 939 atexit(qemu_run_exit_notifiers); 940 941 module_call_init(MODULE_INIT_QOM); 942 module_call_init(MODULE_INIT_MIGRATION); 943 944 runstate_init(); 945 precopy_infrastructure_init(); 946 postcopy_infrastructure_init(); 947 monitor_init_globals(); 948 949 if (qcrypto_init(&err) < 0) { 950 error_reportf_err(err, "cannot initialize crypto: "); 951 exit(1); 952 } 953 954 os_setup_early_signal_handling(); 955 956 bdrv_init_with_whitelist(); 957 socket_init(); 958 } 959 960 961 void qemu_cleanup(int status) 962 { 963 gdb_exit(status); 964 965 /* 966 * cleaning up the migration object cancels any existing migration 967 * try to do this early so that it also stops using devices. 968 */ 969 migration_shutdown(); 970 971 /* 972 * Close the exports before draining the block layer. The export 973 * drivers may have coroutines yielding on it, so we need to clean 974 * them up before the drain, as otherwise they may be get stuck in 975 * blk_wait_while_drained(). 976 */ 977 blk_exp_close_all(); 978 979 980 /* No more vcpu or device emulation activity beyond this point */ 981 vm_shutdown(); 982 replay_finish(); 983 984 /* 985 * We must cancel all block jobs while the block layer is drained, 986 * or cancelling will be affected by throttling and thus may block 987 * for an extended period of time. 988 * Begin the drained section after vm_shutdown() to avoid requests being 989 * stuck in the BlockBackend's request queue. 990 * We do not need to end this section, because we do not want any 991 * requests happening from here on anyway. 992 */ 993 bdrv_drain_all_begin(); 994 job_cancel_sync_all(); 995 bdrv_close_all(); 996 997 /* vhost-user must be cleaned up before chardevs. */ 998 tpm_cleanup(); 999 net_cleanup(); 1000 audio_cleanup(); 1001 monitor_cleanup(); 1002 qemu_chr_cleanup(); 1003 user_creatable_cleanup(); 1004 /* TODO: unref root container, check all devices are ok */ 1005 } 1006