system/cpus.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   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 "monitor/monitor.h"
  27 #include "qemu/coroutine-tls.h"
  28 #include "qapi/error.h"
  29 #include "qapi/qapi-commands-machine.h"
  30 #include "qapi/qapi-commands-misc.h"
  31 #include "qapi/qapi-events-run-state.h"
  32 #include "qapi/qmp/qerror.h"
  33 #include "exec/gdbstub.h"
  34 #include "sysemu/hw_accel.h"
  35 #include "exec/cpu-common.h"
  36 #include "qemu/thread.h"
  37 #include "qemu/main-loop.h"
  38 #include "qemu/plugin.h"
  39 #include "sysemu/cpus.h"
  40 #include "qemu/guest-random.h"
  41 #include "hw/nmi.h"
  42 #include "sysemu/replay.h"
  43 #include "sysemu/runstate.h"
  44 #include "sysemu/cpu-timers.h"
  45 #include "sysemu/whpx.h"
  46 #include "hw/boards.h"
  47 #include "hw/hw.h"
  48 #include "trace.h"
  49
  50 #ifdef CONFIG_LINUX
  51
  52 #include <sys/prctl.h>
  53
  54 #ifndef PR_MCE_KILL
  55 #define PR_MCE_KILL 33
  56 #endif
  57
  58 #ifndef PR_MCE_KILL_SET
  59 #define PR_MCE_KILL_SET 1
  60 #endif
  61
  62 #ifndef PR_MCE_KILL_EARLY
  63 #define PR_MCE_KILL_EARLY 1
  64 #endif
  65
  66 #endif /* CONFIG_LINUX */
  67
  68 /* The Big QEMU Lock (BQL) */
  69 static QemuMutex bql;
  70
  71 /*
  72  * The chosen accelerator is supposed to register this.
  73  */
  74 static const AccelOpsClass *cpus_accel;
  75
  76 bool cpu_is_stopped(CPUState *cpu)
  77 {
  78     return cpu->stopped || !runstate_is_running();
  79 }
  80
  81 bool cpu_work_list_empty(CPUState *cpu)
  82 {
  83     return QSIMPLEQ_EMPTY_ATOMIC(&cpu->work_list);
  84 }
  85
  86 bool cpu_thread_is_idle(CPUState *cpu)
  87 {
  88     if (cpu->stop || !cpu_work_list_empty(cpu)) {
  89         return false;
  90     }
  91     if (cpu_is_stopped(cpu)) {
  92         return true;
  93     }
  94     if (!cpu->halted || cpu_has_work(cpu)) {
  95         return false;
  96     }
  97     if (cpus_accel->cpu_thread_is_idle) {
  98         return cpus_accel->cpu_thread_is_idle(cpu);
  99     }
 100     return true;
 101 }
 102
 103 bool all_cpu_threads_idle(void)
 104 {
 105     CPUState *cpu;
 106
 107     CPU_FOREACH(cpu) {
 108         if (!cpu_thread_is_idle(cpu)) {
 109             return false;
 110         }
 111     }
 112     return true;
 113 }
 114
 115 /***********************************************************/
 116 void hw_error(const char *fmt, ...)
 117 {
 118     va_list ap;
 119     CPUState *cpu;
 120
 121     va_start(ap, fmt);
 122     fprintf(stderr, "qemu: hardware error: ");
 123     vfprintf(stderr, fmt, ap);
 124     fprintf(stderr, "\n");
 125     CPU_FOREACH(cpu) {
 126         fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
 127         cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
 128     }
 129     va_end(ap);
 130     abort();
 131 }
 132
 133 void cpu_synchronize_all_states(void)
 134 {
 135     CPUState *cpu;
 136
 137     CPU_FOREACH(cpu) {
 138         cpu_synchronize_state(cpu);
 139     }
 140 }
 141
 142 void cpu_synchronize_all_post_reset(void)
 143 {
 144     CPUState *cpu;
 145
 146     CPU_FOREACH(cpu) {
 147         cpu_synchronize_post_reset(cpu);
 148     }
 149 }
 150
 151 void cpu_synchronize_all_post_init(void)
 152 {
 153     CPUState *cpu;
 154
 155     CPU_FOREACH(cpu) {
 156         cpu_synchronize_post_init(cpu);
 157     }
 158 }
 159
 160 void cpu_synchronize_all_pre_loadvm(void)
 161 {
 162     CPUState *cpu;
 163
 164     CPU_FOREACH(cpu) {
 165         cpu_synchronize_pre_loadvm(cpu);
 166     }
 167 }
 168
 169 void cpu_synchronize_state(CPUState *cpu)
 170 {
 171     if (cpus_accel->synchronize_state) {
 172         cpus_accel->synchronize_state(cpu);
 173     }
 174 }
 175
 176 void cpu_synchronize_post_reset(CPUState *cpu)
 177 {
 178     if (cpus_accel->synchronize_post_reset) {
 179         cpus_accel->synchronize_post_reset(cpu);
 180     }
 181 }
 182
 183 void cpu_synchronize_post_init(CPUState *cpu)
 184 {
 185     if (cpus_accel->synchronize_post_init) {
 186         cpus_accel->synchronize_post_init(cpu);
 187     }
 188 }
 189
 190 void cpu_synchronize_pre_loadvm(CPUState *cpu)
 191 {
 192     if (cpus_accel->synchronize_pre_loadvm) {
 193         cpus_accel->synchronize_pre_loadvm(cpu);
 194     }
 195 }
 196
 197 bool cpus_are_resettable(void)
 198 {
 199     if (cpus_accel->cpus_are_resettable) {
 200         return cpus_accel->cpus_are_resettable();
 201     }
 202     return true;
 203 }
 204
 205 void cpu_exec_reset_hold(CPUState *cpu)
 206 {
 207     if (cpus_accel->cpu_reset_hold) {
 208         cpus_accel->cpu_reset_hold(cpu);
 209     }
 210 }
 211
 212 int64_t cpus_get_virtual_clock(void)
 213 {
 214     /*
 215      * XXX
 216      *
 217      * need to check that cpus_accel is not NULL, because qcow2 calls
 218      * qemu_get_clock_ns(CLOCK_VIRTUAL) without any accel initialized and
 219      * with ticks disabled in some io-tests:
 220      * 030 040 041 060 099 120 127 140 156 161 172 181 191 192 195 203 229 249 256 267
 221      *
 222      * is this expected?
 223      *
 224      * XXX
 225      */
 226     if (cpus_accel && cpus_accel->get_virtual_clock) {
 227         return cpus_accel->get_virtual_clock();
 228     }
 229     return cpu_get_clock();
 230 }
 231
 232 /*
 233  * return the time elapsed in VM between vm_start and vm_stop.  Unless
 234  * icount is active, cpus_get_elapsed_ticks() uses units of the host CPU cycle
 235  * counter.
 236  */
 237 int64_t cpus_get_elapsed_ticks(void)
 238 {
 239     if (cpus_accel->get_elapsed_ticks) {
 240         return cpus_accel->get_elapsed_ticks();
 241     }
 242     return cpu_get_ticks();
 243 }
 244
 245 static void generic_handle_interrupt(CPUState *cpu, int mask)
 246 {
 247     cpu->interrupt_request |= mask;
 248
 249     if (!qemu_cpu_is_self(cpu)) {
 250         qemu_cpu_kick(cpu);
 251     }
 252 }
 253
 254 void cpu_interrupt(CPUState *cpu, int mask)
 255 {
 256     if (cpus_accel->handle_interrupt) {
 257         cpus_accel->handle_interrupt(cpu, mask);
 258     } else {
 259         generic_handle_interrupt(cpu, mask);
 260     }
 261 }
 262
 263 /*
 264  * True if the vm was previously suspended, and has not been woken or reset.
 265  */
 266 static int vm_was_suspended;
 267
 268 void vm_set_suspended(bool suspended)
 269 {
 270     vm_was_suspended = suspended;
 271 }
 272
 273 bool vm_get_suspended(void)
 274 {
 275     return vm_was_suspended;
 276 }
 277
 278 static int do_vm_stop(RunState state, bool send_stop)
 279 {
 280     int ret = 0;
 281     RunState oldstate = runstate_get();
 282
 283     if (runstate_is_live(oldstate)) {
 284         vm_was_suspended = (oldstate == RUN_STATE_SUSPENDED);
 285         runstate_set(state);
 286         cpu_disable_ticks();
 287         if (oldstate == RUN_STATE_RUNNING) {
 288             pause_all_vcpus();
 289         }
 290         vm_state_notify(0, state);
 291         if (send_stop) {
 292             qapi_event_send_stop();
 293         }
 294     }
 295
 296     bdrv_drain_all();
 297     ret = bdrv_flush_all();
 298     trace_vm_stop_flush_all(ret);
 299
 300     return ret;
 301 }
 302
 303 /* Special vm_stop() variant for terminating the process.  Historically clients
 304  * did not expect a QMP STOP event and so we need to retain compatibility.
 305  */
 306 int vm_shutdown(void)
 307 {
 308     return do_vm_stop(RUN_STATE_SHUTDOWN, false);
 309 }
 310
 311 bool cpu_can_run(CPUState *cpu)
 312 {
 313     if (cpu->stop) {
 314         return false;
 315     }
 316     if (cpu_is_stopped(cpu)) {
 317         return false;
 318     }
 319     return true;
 320 }
 321
 322 void cpu_handle_guest_debug(CPUState *cpu)
 323 {
 324     if (replay_running_debug()) {
 325         if (!cpu->singlestep_enabled) {
 326             /*
 327              * Report about the breakpoint and
 328              * make a single step to skip it
 329              */
 330             replay_breakpoint();
 331             cpu_single_step(cpu, SSTEP_ENABLE);
 332         } else {
 333             cpu_single_step(cpu, 0);
 334         }
 335     } else {
 336         gdb_set_stop_cpu(cpu);
 337         qemu_system_debug_request();
 338         cpu->stopped = true;
 339     }
 340 }
 341
 342 #ifdef CONFIG_LINUX
 343 static void sigbus_reraise(void)
 344 {
 345     sigset_t set;
 346     struct sigaction action;
 347
 348     memset(&action, 0, sizeof(action));
 349     action.sa_handler = SIG_DFL;
 350     if (!sigaction(SIGBUS, &action, NULL)) {
 351         raise(SIGBUS);
 352         sigemptyset(&set);
 353         sigaddset(&set, SIGBUS);
 354         pthread_sigmask(SIG_UNBLOCK, &set, NULL);
 355     }
 356     perror("Failed to re-raise SIGBUS!");
 357     abort();
 358 }
 359
 360 static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
 361 {
 362     if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
 363         sigbus_reraise();
 364     }
 365
 366     if (current_cpu) {
 367         /* Called asynchronously in VCPU thread.  */
 368         if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) {
 369             sigbus_reraise();
 370         }
 371     } else {
 372         /* Called synchronously (via signalfd) in main thread.  */
 373         if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
 374             sigbus_reraise();
 375         }
 376     }
 377 }
 378
 379 static void qemu_init_sigbus(void)
 380 {
 381     struct sigaction action;
 382
 383     /*
 384      * ALERT: when modifying this, take care that SIGBUS forwarding in
 385      * qemu_prealloc_mem() will continue working as expected.
 386      */
 387     memset(&action, 0, sizeof(action));
 388     action.sa_flags = SA_SIGINFO;
 389     action.sa_sigaction = sigbus_handler;
 390     sigaction(SIGBUS, &action, NULL);
 391
 392     prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
 393 }
 394 #else /* !CONFIG_LINUX */
 395 static void qemu_init_sigbus(void)
 396 {
 397 }
 398 #endif /* !CONFIG_LINUX */
 399
 400 static QemuThread io_thread;
 401
 402 /* cpu creation */
 403 static QemuCond qemu_cpu_cond;
 404 /* system init */
 405 static QemuCond qemu_pause_cond;
 406
 407 void qemu_init_cpu_loop(void)
 408 {
 409     qemu_init_sigbus();
 410     qemu_cond_init(&qemu_cpu_cond);
 411     qemu_cond_init(&qemu_pause_cond);
 412     qemu_mutex_init(&bql);
 413
 414     qemu_thread_get_self(&io_thread);
 415 }
 416
 417 void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data)
 418 {
 419     do_run_on_cpu(cpu, func, data, &bql);
 420 }
 421
 422 static void qemu_cpu_stop(CPUState *cpu, bool exit)
 423 {
 424     g_assert(qemu_cpu_is_self(cpu));
 425     cpu->stop = false;
 426     cpu->stopped = true;
 427     if (exit) {
 428         cpu_exit(cpu);
 429     }
 430     qemu_cond_broadcast(&qemu_pause_cond);
 431 }
 432
 433 void qemu_wait_io_event_common(CPUState *cpu)
 434 {
 435     qatomic_set_mb(&cpu->thread_kicked, false);
 436     if (cpu->stop) {
 437         qemu_cpu_stop(cpu, false);
 438     }
 439     process_queued_cpu_work(cpu);
 440 }
 441
 442 void qemu_wait_io_event(CPUState *cpu)
 443 {
 444     bool slept = false;
 445
 446     while (cpu_thread_is_idle(cpu)) {
 447         if (!slept) {
 448             slept = true;
 449             qemu_plugin_vcpu_idle_cb(cpu);
 450         }
 451         qemu_cond_wait(cpu->halt_cond, &bql);
 452     }
 453     if (slept) {
 454         qemu_plugin_vcpu_resume_cb(cpu);
 455     }
 456
 457     qemu_wait_io_event_common(cpu);
 458 }
 459
 460 void cpus_kick_thread(CPUState *cpu)
 461 {
 462     if (cpu->thread_kicked) {
 463         return;
 464     }
 465     cpu->thread_kicked = true;
 466
 467 #ifndef _WIN32
 468     int err = pthread_kill(cpu->thread->thread, SIG_IPI);
 469     if (err && err != ESRCH) {
 470         fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
 471         exit(1);
 472     }
 473 #else
 474     qemu_sem_post(&cpu->sem);
 475 #endif
 476 }
 477
 478 void qemu_cpu_kick(CPUState *cpu)
 479 {
 480     qemu_cond_broadcast(cpu->halt_cond);
 481     if (cpus_accel->kick_vcpu_thread) {
 482         cpus_accel->kick_vcpu_thread(cpu);
 483     } else { /* default */
 484         cpus_kick_thread(cpu);
 485     }
 486 }
 487
 488 void qemu_cpu_kick_self(void)
 489 {
 490     assert(current_cpu);
 491     cpus_kick_thread(current_cpu);
 492 }
 493
 494 bool qemu_cpu_is_self(CPUState *cpu)
 495 {
 496     return qemu_thread_is_self(cpu->thread);
 497 }
 498
 499 bool qemu_in_vcpu_thread(void)
 500 {
 501     return current_cpu && qemu_cpu_is_self(current_cpu);
 502 }
 503
 504 QEMU_DEFINE_STATIC_CO_TLS(bool, bql_locked)
 505
 506 bool bql_locked(void)
 507 {
 508     return get_bql_locked();
 509 }
 510
 511 bool qemu_in_main_thread(void)
 512 {
 513     return bql_locked();
 514 }
 515
 516 /*
 517  * The BQL is taken from so many places that it is worth profiling the
 518  * callers directly, instead of funneling them all through a single function.
 519  */
 520 void bql_lock_impl(const char *file, int line)
 521 {
 522     QemuMutexLockFunc bql_lock_fn = qatomic_read(&bql_mutex_lock_func);
 523
 524     g_assert(!bql_locked());
 525     bql_lock_fn(&bql, file, line);
 526     set_bql_locked(true);
 527 }
 528
 529 void bql_unlock(void)
 530 {
 531     g_assert(bql_locked());
 532     set_bql_locked(false);
 533     qemu_mutex_unlock(&bql);
 534 }
 535
 536 void qemu_cond_wait_bql(QemuCond *cond)
 537 {
 538     qemu_cond_wait(cond, &bql);
 539 }
 540
 541 void qemu_cond_timedwait_bql(QemuCond *cond, int ms)
 542 {
 543     qemu_cond_timedwait(cond, &bql, ms);
 544 }
 545
 546 /* signal CPU creation */
 547 void cpu_thread_signal_created(CPUState *cpu)
 548 {
 549     cpu->created = true;
 550     qemu_cond_signal(&qemu_cpu_cond);
 551 }
 552
 553 /* signal CPU destruction */
 554 void cpu_thread_signal_destroyed(CPUState *cpu)
 555 {
 556     cpu->created = false;
 557     qemu_cond_signal(&qemu_cpu_cond);
 558 }
 559
 560
 561 static bool all_vcpus_paused(void)
 562 {
 563     CPUState *cpu;
 564
 565     CPU_FOREACH(cpu) {
 566         if (!cpu->stopped) {
 567             return false;
 568         }
 569     }
 570
 571     return true;
 572 }
 573
 574 void pause_all_vcpus(void)
 575 {
 576     CPUState *cpu;
 577
 578     qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
 579     CPU_FOREACH(cpu) {
 580         if (qemu_cpu_is_self(cpu)) {
 581             qemu_cpu_stop(cpu, true);
 582         } else {
 583             cpu->stop = true;
 584             qemu_cpu_kick(cpu);
 585         }
 586     }
 587
 588     /* We need to drop the replay_lock so any vCPU threads woken up
 589      * can finish their replay tasks
 590      */
 591     replay_mutex_unlock();
 592
 593     while (!all_vcpus_paused()) {
 594         qemu_cond_wait(&qemu_pause_cond, &bql);
 595         CPU_FOREACH(cpu) {
 596             qemu_cpu_kick(cpu);
 597         }
 598     }
 599
 600     bql_unlock();
 601     replay_mutex_lock();
 602     bql_lock();
 603 }
 604
 605 void cpu_resume(CPUState *cpu)
 606 {
 607     cpu->stop = false;
 608     cpu->stopped = false;
 609     qemu_cpu_kick(cpu);
 610 }
 611
 612 void resume_all_vcpus(void)
 613 {
 614     CPUState *cpu;
 615
 616     if (!runstate_is_running()) {
 617         return;
 618     }
 619
 620     qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
 621     CPU_FOREACH(cpu) {
 622         cpu_resume(cpu);
 623     }
 624 }
 625
 626 void cpu_remove_sync(CPUState *cpu)
 627 {
 628     cpu->stop = true;
 629     cpu->unplug = true;
 630     qemu_cpu_kick(cpu);
 631     bql_unlock();
 632     qemu_thread_join(cpu->thread);
 633     bql_lock();
 634 }
 635
 636 void cpus_register_accel(const AccelOpsClass *ops)
 637 {
 638     assert(ops != NULL);
 639     assert(ops->create_vcpu_thread != NULL); /* mandatory */
 640     cpus_accel = ops;
 641 }
 642
 643 const AccelOpsClass *cpus_get_accel(void)
 644 {
 645     /* broken if we call this early */
 646     assert(cpus_accel);
 647     return cpus_accel;
 648 }
 649
 650 void qemu_init_vcpu(CPUState *cpu)
 651 {
 652     MachineState *ms = MACHINE(qdev_get_machine());
 653
 654     cpu->nr_cores = machine_topo_get_cores_per_socket(ms);
 655     cpu->nr_threads =  ms->smp.threads;
 656     cpu->stopped = true;
 657     cpu->random_seed = qemu_guest_random_seed_thread_part1();
 658
 659     if (!cpu->as) {
 660         /* If the target cpu hasn't set up any address spaces itself,
 661          * give it the default one.
 662          */
 663         cpu->num_ases = 1;
 664         cpu_address_space_init(cpu, 0, "cpu-memory", cpu->memory);
 665     }
 666
 667     /* accelerators all implement the AccelOpsClass */
 668     g_assert(cpus_accel != NULL && cpus_accel->create_vcpu_thread != NULL);
 669     cpus_accel->create_vcpu_thread(cpu);
 670
 671     while (!cpu->created) {
 672         qemu_cond_wait(&qemu_cpu_cond, &bql);
 673     }
 674 }
 675
 676 void cpu_stop_current(void)
 677 {
 678     if (current_cpu) {
 679         current_cpu->stop = true;
 680         cpu_exit(current_cpu);
 681     }
 682 }
 683
 684 int vm_stop(RunState state)
 685 {
 686     if (qemu_in_vcpu_thread()) {
 687         qemu_system_vmstop_request_prepare();
 688         qemu_system_vmstop_request(state);
 689         /*
 690          * FIXME: should not return to device code in case
 691          * vm_stop() has been requested.
 692          */
 693         cpu_stop_current();
 694         return 0;
 695     }
 696
 697     return do_vm_stop(state, true);
 698 }
 699
 700 /**
 701  * Prepare for (re)starting the VM.
 702  * Returns 0 if the vCPUs should be restarted, -1 on an error condition,
 703  * and 1 otherwise.
 704  */
 705 int vm_prepare_start(bool step_pending)
 706 {
 707     int ret = vm_was_suspended ? 1 : 0;
 708     RunState state = vm_was_suspended ? RUN_STATE_SUSPENDED : RUN_STATE_RUNNING;
 709     RunState requested;
 710
 711     qemu_vmstop_requested(&requested);
 712     if (runstate_is_running() && requested == RUN_STATE__MAX) {
 713         return -1;
 714     }
 715
 716     /* Ensure that a STOP/RESUME pair of events is emitted if a
 717      * vmstop request was pending.  The BLOCK_IO_ERROR event, for
 718      * example, according to documentation is always followed by
 719      * the STOP event.
 720      */
 721     if (runstate_is_running()) {
 722         qapi_event_send_stop();
 723         qapi_event_send_resume();
 724         return -1;
 725     }
 726
 727     /*
 728      * WHPX accelerator needs to know whether we are going to step
 729      * any CPUs, before starting the first one.
 730      */
 731     if (cpus_accel->synchronize_pre_resume) {
 732         cpus_accel->synchronize_pre_resume(step_pending);
 733     }
 734
 735     /* We are sending this now, but the CPUs will be resumed shortly later */
 736     qapi_event_send_resume();
 737
 738     cpu_enable_ticks();
 739     runstate_set(state);
 740     vm_state_notify(1, state);
 741     vm_was_suspended = false;
 742     return ret;
 743 }
 744
 745 void vm_start(void)
 746 {
 747     if (!vm_prepare_start(false)) {
 748         resume_all_vcpus();
 749     }
 750 }
 751
 752 void vm_resume(RunState state)
 753 {
 754     if (runstate_is_live(state)) {
 755         vm_start();
 756     } else {
 757         runstate_set(state);
 758     }
 759 }
 760
 761 /* does a state transition even if the VM is already stopped,
 762    current state is forgotten forever */
 763 int vm_stop_force_state(RunState state)
 764 {
 765     if (runstate_is_live(runstate_get())) {
 766         return vm_stop(state);
 767     } else {
 768         int ret;
 769         runstate_set(state);
 770
 771         bdrv_drain_all();
 772         /* Make sure to return an error if the flush in a previous vm_stop()
 773          * failed. */
 774         ret = bdrv_flush_all();
 775         trace_vm_stop_flush_all(ret);
 776         return ret;
 777     }
 778 }
 779
 780 void qmp_memsave(int64_t addr, int64_t size, const char *filename,
 781                  bool has_cpu, int64_t cpu_index, Error **errp)
 782 {
 783     FILE *f;
 784     uint32_t l;
 785     CPUState *cpu;
 786     uint8_t buf[1024];
 787     int64_t orig_addr = addr, orig_size = size;
 788
 789     if (!has_cpu) {
 790         cpu_index = 0;
 791     }
 792
 793     cpu = qemu_get_cpu(cpu_index);
 794     if (cpu == NULL) {
 795         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
 796                    "a CPU number");
 797         return;
 798     }
 799
 800     f = fopen(filename, "wb");
 801     if (!f) {
 802         error_setg_file_open(errp, errno, filename);
 803         return;
 804     }
 805
 806     while (size != 0) {
 807         l = sizeof(buf);
 808         if (l > size)
 809             l = size;
 810         if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) {
 811             error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64
 812                              " specified", orig_addr, orig_size);
 813             goto exit;
 814         }
 815         if (fwrite(buf, 1, l, f) != l) {
 816             error_setg(errp, QERR_IO_ERROR);
 817             goto exit;
 818         }
 819         addr += l;
 820         size -= l;
 821     }
 822
 823 exit:
 824     fclose(f);
 825 }
 826
 827 void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
 828                   Error **errp)
 829 {
 830     FILE *f;
 831     uint32_t l;
 832     uint8_t buf[1024];
 833
 834     f = fopen(filename, "wb");
 835     if (!f) {
 836         error_setg_file_open(errp, errno, filename);
 837         return;
 838     }
 839
 840     while (size != 0) {
 841         l = sizeof(buf);
 842         if (l > size)
 843             l = size;
 844         cpu_physical_memory_read(addr, buf, l);
 845         if (fwrite(buf, 1, l, f) != l) {
 846             error_setg(errp, QERR_IO_ERROR);
 847             goto exit;
 848         }
 849         addr += l;
 850         size -= l;
 851     }
 852
 853 exit:
 854     fclose(f);
 855 }
 856
 857 void qmp_inject_nmi(Error **errp)
 858 {
 859     nmi_monitor_handle(monitor_get_cpu_index(monitor_cur()), errp);
 860 }
 861