xref: /openbmc/qemu/system/cpus.c (revision 259ebed4)
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 static QemuMutex qemu_global_mutex;
69 
70 /*
71  * The chosen accelerator is supposed to register this.
72  */
73 static const AccelOpsClass *cpus_accel;
74 
75 bool cpu_is_stopped(CPUState *cpu)
76 {
77     return cpu->stopped || !runstate_is_running();
78 }
79 
80 bool cpu_work_list_empty(CPUState *cpu)
81 {
82     return QSIMPLEQ_EMPTY_ATOMIC(&cpu->work_list);
83 }
84 
85 bool cpu_thread_is_idle(CPUState *cpu)
86 {
87     if (cpu->stop || !cpu_work_list_empty(cpu)) {
88         return false;
89     }
90     if (cpu_is_stopped(cpu)) {
91         return true;
92     }
93     if (!cpu->halted || cpu_has_work(cpu)) {
94         return false;
95     }
96     if (cpus_accel->cpu_thread_is_idle) {
97         return cpus_accel->cpu_thread_is_idle(cpu);
98     }
99     return true;
100 }
101 
102 bool all_cpu_threads_idle(void)
103 {
104     CPUState *cpu;
105 
106     CPU_FOREACH(cpu) {
107         if (!cpu_thread_is_idle(cpu)) {
108             return false;
109         }
110     }
111     return true;
112 }
113 
114 /***********************************************************/
115 void hw_error(const char *fmt, ...)
116 {
117     va_list ap;
118     CPUState *cpu;
119 
120     va_start(ap, fmt);
121     fprintf(stderr, "qemu: hardware error: ");
122     vfprintf(stderr, fmt, ap);
123     fprintf(stderr, "\n");
124     CPU_FOREACH(cpu) {
125         fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
126         cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
127     }
128     va_end(ap);
129     abort();
130 }
131 
132 void cpu_synchronize_all_states(void)
133 {
134     CPUState *cpu;
135 
136     CPU_FOREACH(cpu) {
137         cpu_synchronize_state(cpu);
138     }
139 }
140 
141 void cpu_synchronize_all_post_reset(void)
142 {
143     CPUState *cpu;
144 
145     CPU_FOREACH(cpu) {
146         cpu_synchronize_post_reset(cpu);
147     }
148 }
149 
150 void cpu_synchronize_all_post_init(void)
151 {
152     CPUState *cpu;
153 
154     CPU_FOREACH(cpu) {
155         cpu_synchronize_post_init(cpu);
156     }
157 }
158 
159 void cpu_synchronize_all_pre_loadvm(void)
160 {
161     CPUState *cpu;
162 
163     CPU_FOREACH(cpu) {
164         cpu_synchronize_pre_loadvm(cpu);
165     }
166 }
167 
168 void cpu_synchronize_state(CPUState *cpu)
169 {
170     if (cpus_accel->synchronize_state) {
171         cpus_accel->synchronize_state(cpu);
172     }
173 }
174 
175 void cpu_synchronize_post_reset(CPUState *cpu)
176 {
177     if (cpus_accel->synchronize_post_reset) {
178         cpus_accel->synchronize_post_reset(cpu);
179     }
180 }
181 
182 void cpu_synchronize_post_init(CPUState *cpu)
183 {
184     if (cpus_accel->synchronize_post_init) {
185         cpus_accel->synchronize_post_init(cpu);
186     }
187 }
188 
189 void cpu_synchronize_pre_loadvm(CPUState *cpu)
190 {
191     if (cpus_accel->synchronize_pre_loadvm) {
192         cpus_accel->synchronize_pre_loadvm(cpu);
193     }
194 }
195 
196 bool cpus_are_resettable(void)
197 {
198     if (cpus_accel->cpus_are_resettable) {
199         return cpus_accel->cpus_are_resettable();
200     }
201     return true;
202 }
203 
204 int64_t cpus_get_virtual_clock(void)
205 {
206     /*
207      * XXX
208      *
209      * need to check that cpus_accel is not NULL, because qcow2 calls
210      * qemu_get_clock_ns(CLOCK_VIRTUAL) without any accel initialized and
211      * with ticks disabled in some io-tests:
212      * 030 040 041 060 099 120 127 140 156 161 172 181 191 192 195 203 229 249 256 267
213      *
214      * is this expected?
215      *
216      * XXX
217      */
218     if (cpus_accel && cpus_accel->get_virtual_clock) {
219         return cpus_accel->get_virtual_clock();
220     }
221     return cpu_get_clock();
222 }
223 
224 /*
225  * return the time elapsed in VM between vm_start and vm_stop.  Unless
226  * icount is active, cpus_get_elapsed_ticks() uses units of the host CPU cycle
227  * counter.
228  */
229 int64_t cpus_get_elapsed_ticks(void)
230 {
231     if (cpus_accel->get_elapsed_ticks) {
232         return cpus_accel->get_elapsed_ticks();
233     }
234     return cpu_get_ticks();
235 }
236 
237 static void generic_handle_interrupt(CPUState *cpu, int mask)
238 {
239     cpu->interrupt_request |= mask;
240 
241     if (!qemu_cpu_is_self(cpu)) {
242         qemu_cpu_kick(cpu);
243     }
244 }
245 
246 void cpu_interrupt(CPUState *cpu, int mask)
247 {
248     if (cpus_accel->handle_interrupt) {
249         cpus_accel->handle_interrupt(cpu, mask);
250     } else {
251         generic_handle_interrupt(cpu, mask);
252     }
253 }
254 
255 static int do_vm_stop(RunState state, bool send_stop)
256 {
257     int ret = 0;
258 
259     if (runstate_is_running()) {
260         runstate_set(state);
261         cpu_disable_ticks();
262         pause_all_vcpus();
263         vm_state_notify(0, state);
264         if (send_stop) {
265             qapi_event_send_stop();
266         }
267     }
268 
269     bdrv_drain_all();
270     ret = bdrv_flush_all();
271     trace_vm_stop_flush_all(ret);
272 
273     return ret;
274 }
275 
276 /* Special vm_stop() variant for terminating the process.  Historically clients
277  * did not expect a QMP STOP event and so we need to retain compatibility.
278  */
279 int vm_shutdown(void)
280 {
281     return do_vm_stop(RUN_STATE_SHUTDOWN, false);
282 }
283 
284 bool cpu_can_run(CPUState *cpu)
285 {
286     if (cpu->stop) {
287         return false;
288     }
289     if (cpu_is_stopped(cpu)) {
290         return false;
291     }
292     return true;
293 }
294 
295 void cpu_handle_guest_debug(CPUState *cpu)
296 {
297     if (replay_running_debug()) {
298         if (!cpu->singlestep_enabled) {
299             /*
300              * Report about the breakpoint and
301              * make a single step to skip it
302              */
303             replay_breakpoint();
304             cpu_single_step(cpu, SSTEP_ENABLE);
305         } else {
306             cpu_single_step(cpu, 0);
307         }
308     } else {
309         gdb_set_stop_cpu(cpu);
310         qemu_system_debug_request();
311         cpu->stopped = true;
312     }
313 }
314 
315 #ifdef CONFIG_LINUX
316 static void sigbus_reraise(void)
317 {
318     sigset_t set;
319     struct sigaction action;
320 
321     memset(&action, 0, sizeof(action));
322     action.sa_handler = SIG_DFL;
323     if (!sigaction(SIGBUS, &action, NULL)) {
324         raise(SIGBUS);
325         sigemptyset(&set);
326         sigaddset(&set, SIGBUS);
327         pthread_sigmask(SIG_UNBLOCK, &set, NULL);
328     }
329     perror("Failed to re-raise SIGBUS!");
330     abort();
331 }
332 
333 static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
334 {
335     if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
336         sigbus_reraise();
337     }
338 
339     if (current_cpu) {
340         /* Called asynchronously in VCPU thread.  */
341         if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) {
342             sigbus_reraise();
343         }
344     } else {
345         /* Called synchronously (via signalfd) in main thread.  */
346         if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
347             sigbus_reraise();
348         }
349     }
350 }
351 
352 static void qemu_init_sigbus(void)
353 {
354     struct sigaction action;
355 
356     /*
357      * ALERT: when modifying this, take care that SIGBUS forwarding in
358      * qemu_prealloc_mem() will continue working as expected.
359      */
360     memset(&action, 0, sizeof(action));
361     action.sa_flags = SA_SIGINFO;
362     action.sa_sigaction = sigbus_handler;
363     sigaction(SIGBUS, &action, NULL);
364 
365     prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
366 }
367 #else /* !CONFIG_LINUX */
368 static void qemu_init_sigbus(void)
369 {
370 }
371 #endif /* !CONFIG_LINUX */
372 
373 static QemuThread io_thread;
374 
375 /* cpu creation */
376 static QemuCond qemu_cpu_cond;
377 /* system init */
378 static QemuCond qemu_pause_cond;
379 
380 void qemu_init_cpu_loop(void)
381 {
382     qemu_init_sigbus();
383     qemu_cond_init(&qemu_cpu_cond);
384     qemu_cond_init(&qemu_pause_cond);
385     qemu_mutex_init(&qemu_global_mutex);
386 
387     qemu_thread_get_self(&io_thread);
388 }
389 
390 void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data)
391 {
392     do_run_on_cpu(cpu, func, data, &qemu_global_mutex);
393 }
394 
395 static void qemu_cpu_stop(CPUState *cpu, bool exit)
396 {
397     g_assert(qemu_cpu_is_self(cpu));
398     cpu->stop = false;
399     cpu->stopped = true;
400     if (exit) {
401         cpu_exit(cpu);
402     }
403     qemu_cond_broadcast(&qemu_pause_cond);
404 }
405 
406 void qemu_wait_io_event_common(CPUState *cpu)
407 {
408     qatomic_set_mb(&cpu->thread_kicked, false);
409     if (cpu->stop) {
410         qemu_cpu_stop(cpu, false);
411     }
412     process_queued_cpu_work(cpu);
413 }
414 
415 void qemu_wait_io_event(CPUState *cpu)
416 {
417     bool slept = false;
418 
419     while (cpu_thread_is_idle(cpu)) {
420         if (!slept) {
421             slept = true;
422             qemu_plugin_vcpu_idle_cb(cpu);
423         }
424         qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
425     }
426     if (slept) {
427         qemu_plugin_vcpu_resume_cb(cpu);
428     }
429 
430     qemu_wait_io_event_common(cpu);
431 }
432 
433 void cpus_kick_thread(CPUState *cpu)
434 {
435     if (cpu->thread_kicked) {
436         return;
437     }
438     cpu->thread_kicked = true;
439 
440 #ifndef _WIN32
441     int err = pthread_kill(cpu->thread->thread, SIG_IPI);
442     if (err && err != ESRCH) {
443         fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
444         exit(1);
445     }
446 #else
447     qemu_sem_post(&cpu->sem);
448 #endif
449 }
450 
451 void qemu_cpu_kick(CPUState *cpu)
452 {
453     qemu_cond_broadcast(cpu->halt_cond);
454     if (cpus_accel->kick_vcpu_thread) {
455         cpus_accel->kick_vcpu_thread(cpu);
456     } else { /* default */
457         cpus_kick_thread(cpu);
458     }
459 }
460 
461 void qemu_cpu_kick_self(void)
462 {
463     assert(current_cpu);
464     cpus_kick_thread(current_cpu);
465 }
466 
467 bool qemu_cpu_is_self(CPUState *cpu)
468 {
469     return qemu_thread_is_self(cpu->thread);
470 }
471 
472 bool qemu_in_vcpu_thread(void)
473 {
474     return current_cpu && qemu_cpu_is_self(current_cpu);
475 }
476 
477 QEMU_DEFINE_STATIC_CO_TLS(bool, iothread_locked)
478 
479 bool qemu_mutex_iothread_locked(void)
480 {
481     return get_iothread_locked();
482 }
483 
484 bool qemu_in_main_thread(void)
485 {
486     return qemu_mutex_iothread_locked();
487 }
488 
489 /*
490  * The BQL is taken from so many places that it is worth profiling the
491  * callers directly, instead of funneling them all through a single function.
492  */
493 void qemu_mutex_lock_iothread_impl(const char *file, int line)
494 {
495     QemuMutexLockFunc bql_lock = qatomic_read(&qemu_bql_mutex_lock_func);
496 
497     g_assert(!qemu_mutex_iothread_locked());
498     bql_lock(&qemu_global_mutex, file, line);
499     set_iothread_locked(true);
500 }
501 
502 void qemu_mutex_unlock_iothread(void)
503 {
504     g_assert(qemu_mutex_iothread_locked());
505     set_iothread_locked(false);
506     qemu_mutex_unlock(&qemu_global_mutex);
507 }
508 
509 void qemu_cond_wait_iothread(QemuCond *cond)
510 {
511     qemu_cond_wait(cond, &qemu_global_mutex);
512 }
513 
514 void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
515 {
516     qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
517 }
518 
519 /* signal CPU creation */
520 void cpu_thread_signal_created(CPUState *cpu)
521 {
522     cpu->created = true;
523     qemu_cond_signal(&qemu_cpu_cond);
524 }
525 
526 /* signal CPU destruction */
527 void cpu_thread_signal_destroyed(CPUState *cpu)
528 {
529     cpu->created = false;
530     qemu_cond_signal(&qemu_cpu_cond);
531 }
532 
533 
534 static bool all_vcpus_paused(void)
535 {
536     CPUState *cpu;
537 
538     CPU_FOREACH(cpu) {
539         if (!cpu->stopped) {
540             return false;
541         }
542     }
543 
544     return true;
545 }
546 
547 void pause_all_vcpus(void)
548 {
549     CPUState *cpu;
550 
551     qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
552     CPU_FOREACH(cpu) {
553         if (qemu_cpu_is_self(cpu)) {
554             qemu_cpu_stop(cpu, true);
555         } else {
556             cpu->stop = true;
557             qemu_cpu_kick(cpu);
558         }
559     }
560 
561     /* We need to drop the replay_lock so any vCPU threads woken up
562      * can finish their replay tasks
563      */
564     replay_mutex_unlock();
565 
566     while (!all_vcpus_paused()) {
567         qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
568         CPU_FOREACH(cpu) {
569             qemu_cpu_kick(cpu);
570         }
571     }
572 
573     qemu_mutex_unlock_iothread();
574     replay_mutex_lock();
575     qemu_mutex_lock_iothread();
576 }
577 
578 void cpu_resume(CPUState *cpu)
579 {
580     cpu->stop = false;
581     cpu->stopped = false;
582     qemu_cpu_kick(cpu);
583 }
584 
585 void resume_all_vcpus(void)
586 {
587     CPUState *cpu;
588 
589     if (!runstate_is_running()) {
590         return;
591     }
592 
593     qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
594     CPU_FOREACH(cpu) {
595         cpu_resume(cpu);
596     }
597 }
598 
599 void cpu_remove_sync(CPUState *cpu)
600 {
601     cpu->stop = true;
602     cpu->unplug = true;
603     qemu_cpu_kick(cpu);
604     qemu_mutex_unlock_iothread();
605     qemu_thread_join(cpu->thread);
606     qemu_mutex_lock_iothread();
607 }
608 
609 void cpus_register_accel(const AccelOpsClass *ops)
610 {
611     assert(ops != NULL);
612     assert(ops->create_vcpu_thread != NULL); /* mandatory */
613     cpus_accel = ops;
614 }
615 
616 const AccelOpsClass *cpus_get_accel(void)
617 {
618     /* broken if we call this early */
619     assert(cpus_accel);
620     return cpus_accel;
621 }
622 
623 void qemu_init_vcpu(CPUState *cpu)
624 {
625     MachineState *ms = MACHINE(qdev_get_machine());
626 
627     cpu->nr_cores = ms->smp.cores;
628     cpu->nr_threads =  ms->smp.threads;
629     cpu->stopped = true;
630     cpu->random_seed = qemu_guest_random_seed_thread_part1();
631 
632     if (!cpu->as) {
633         /* If the target cpu hasn't set up any address spaces itself,
634          * give it the default one.
635          */
636         cpu->num_ases = 1;
637         cpu_address_space_init(cpu, 0, "cpu-memory", cpu->memory);
638     }
639 
640     /* accelerators all implement the AccelOpsClass */
641     g_assert(cpus_accel != NULL && cpus_accel->create_vcpu_thread != NULL);
642     cpus_accel->create_vcpu_thread(cpu);
643 
644     while (!cpu->created) {
645         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
646     }
647 }
648 
649 void cpu_stop_current(void)
650 {
651     if (current_cpu) {
652         current_cpu->stop = true;
653         cpu_exit(current_cpu);
654     }
655 }
656 
657 int vm_stop(RunState state)
658 {
659     if (qemu_in_vcpu_thread()) {
660         qemu_system_vmstop_request_prepare();
661         qemu_system_vmstop_request(state);
662         /*
663          * FIXME: should not return to device code in case
664          * vm_stop() has been requested.
665          */
666         cpu_stop_current();
667         return 0;
668     }
669 
670     return do_vm_stop(state, true);
671 }
672 
673 /**
674  * Prepare for (re)starting the VM.
675  * Returns -1 if the vCPUs are not to be restarted (e.g. if they are already
676  * running or in case of an error condition), 0 otherwise.
677  */
678 int vm_prepare_start(bool step_pending)
679 {
680     RunState requested;
681 
682     qemu_vmstop_requested(&requested);
683     if (runstate_is_running() && requested == RUN_STATE__MAX) {
684         return -1;
685     }
686 
687     /* Ensure that a STOP/RESUME pair of events is emitted if a
688      * vmstop request was pending.  The BLOCK_IO_ERROR event, for
689      * example, according to documentation is always followed by
690      * the STOP event.
691      */
692     if (runstate_is_running()) {
693         qapi_event_send_stop();
694         qapi_event_send_resume();
695         return -1;
696     }
697 
698     /*
699      * WHPX accelerator needs to know whether we are going to step
700      * any CPUs, before starting the first one.
701      */
702     if (cpus_accel->synchronize_pre_resume) {
703         cpus_accel->synchronize_pre_resume(step_pending);
704     }
705 
706     /* We are sending this now, but the CPUs will be resumed shortly later */
707     qapi_event_send_resume();
708 
709     cpu_enable_ticks();
710     runstate_set(RUN_STATE_RUNNING);
711     vm_state_notify(1, RUN_STATE_RUNNING);
712     return 0;
713 }
714 
715 void vm_start(void)
716 {
717     if (!vm_prepare_start(false)) {
718         resume_all_vcpus();
719     }
720 }
721 
722 /* does a state transition even if the VM is already stopped,
723    current state is forgotten forever */
724 int vm_stop_force_state(RunState state)
725 {
726     if (runstate_is_running()) {
727         return vm_stop(state);
728     } else {
729         int ret;
730         runstate_set(state);
731 
732         bdrv_drain_all();
733         /* Make sure to return an error if the flush in a previous vm_stop()
734          * failed. */
735         ret = bdrv_flush_all();
736         trace_vm_stop_flush_all(ret);
737         return ret;
738     }
739 }
740 
741 void qmp_memsave(int64_t addr, int64_t size, const char *filename,
742                  bool has_cpu, int64_t cpu_index, Error **errp)
743 {
744     FILE *f;
745     uint32_t l;
746     CPUState *cpu;
747     uint8_t buf[1024];
748     int64_t orig_addr = addr, orig_size = size;
749 
750     if (!has_cpu) {
751         cpu_index = 0;
752     }
753 
754     cpu = qemu_get_cpu(cpu_index);
755     if (cpu == NULL) {
756         error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
757                    "a CPU number");
758         return;
759     }
760 
761     f = fopen(filename, "wb");
762     if (!f) {
763         error_setg_file_open(errp, errno, filename);
764         return;
765     }
766 
767     while (size != 0) {
768         l = sizeof(buf);
769         if (l > size)
770             l = size;
771         if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) {
772             error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64
773                              " specified", orig_addr, orig_size);
774             goto exit;
775         }
776         if (fwrite(buf, 1, l, f) != l) {
777             error_setg(errp, QERR_IO_ERROR);
778             goto exit;
779         }
780         addr += l;
781         size -= l;
782     }
783 
784 exit:
785     fclose(f);
786 }
787 
788 void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
789                   Error **errp)
790 {
791     FILE *f;
792     uint32_t l;
793     uint8_t buf[1024];
794 
795     f = fopen(filename, "wb");
796     if (!f) {
797         error_setg_file_open(errp, errno, filename);
798         return;
799     }
800 
801     while (size != 0) {
802         l = sizeof(buf);
803         if (l > size)
804             l = size;
805         cpu_physical_memory_read(addr, buf, l);
806         if (fwrite(buf, 1, l, f) != l) {
807             error_setg(errp, QERR_IO_ERROR);
808             goto exit;
809         }
810         addr += l;
811         size -= l;
812     }
813 
814 exit:
815     fclose(f);
816 }
817 
818 void qmp_inject_nmi(Error **errp)
819 {
820     nmi_monitor_handle(monitor_get_cpu_index(monitor_cur()), errp);
821 }
822 
823