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