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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/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#include "trace.h"
48
49#ifdef CONFIG_LINUX
50
51#include <sys/prctl.h>
52
53#ifndef PR_MCE_KILL
54#define PR_MCE_KILL 33
55#endif
56
57#ifndef PR_MCE_KILL_SET
58#define PR_MCE_KILL_SET 1
59#endif
60
61#ifndef PR_MCE_KILL_EARLY
62#define PR_MCE_KILL_EARLY 1
63#endif
64
65#endif
66
67static QemuMutex qemu_global_mutex;
68
69
70
71
72static const AccelOpsClass *cpus_accel;
73
74bool cpu_is_stopped(CPUState *cpu)
75{
76 return cpu->stopped || !runstate_is_running();
77}
78
79bool cpu_work_list_empty(CPUState *cpu)
80{
81 return QSIMPLEQ_EMPTY_ATOMIC(&cpu->work_list);
82}
83
84bool cpu_thread_is_idle(CPUState *cpu)
85{
86 if (cpu->stop || !cpu_work_list_empty(cpu)) {
87 return false;
88 }
89 if (cpu_is_stopped(cpu)) {
90 return true;
91 }
92 if (!cpu->halted || cpu_has_work(cpu)) {
93 return false;
94 }
95 if (cpus_accel->cpu_thread_is_idle) {
96 return cpus_accel->cpu_thread_is_idle(cpu);
97 }
98 return true;
99}
100
101bool all_cpu_threads_idle(void)
102{
103 CPUState *cpu;
104
105 CPU_FOREACH(cpu) {
106 if (!cpu_thread_is_idle(cpu)) {
107 return false;
108 }
109 }
110 return true;
111}
112
113
114void hw_error(const char *fmt, ...)
115{
116 va_list ap;
117 CPUState *cpu;
118
119 va_start(ap, fmt);
120 fprintf(stderr, "qemu: hardware error: ");
121 vfprintf(stderr, fmt, ap);
122 fprintf(stderr, "\n");
123 CPU_FOREACH(cpu) {
124 fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
125 cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
126 }
127 va_end(ap);
128 abort();
129}
130
131void cpu_synchronize_all_states(void)
132{
133 CPUState *cpu;
134
135 CPU_FOREACH(cpu) {
136 cpu_synchronize_state(cpu);
137 }
138}
139
140void cpu_synchronize_all_post_reset(void)
141{
142 CPUState *cpu;
143
144 CPU_FOREACH(cpu) {
145 cpu_synchronize_post_reset(cpu);
146 }
147}
148
149void cpu_synchronize_all_post_init(void)
150{
151 CPUState *cpu;
152
153 CPU_FOREACH(cpu) {
154 cpu_synchronize_post_init(cpu);
155 }
156}
157
158void cpu_synchronize_all_pre_loadvm(void)
159{
160 CPUState *cpu;
161
162 CPU_FOREACH(cpu) {
163 cpu_synchronize_pre_loadvm(cpu);
164 }
165}
166
167void cpu_synchronize_state(CPUState *cpu)
168{
169 if (cpus_accel->synchronize_state) {
170 cpus_accel->synchronize_state(cpu);
171 }
172}
173
174void cpu_synchronize_post_reset(CPUState *cpu)
175{
176 if (cpus_accel->synchronize_post_reset) {
177 cpus_accel->synchronize_post_reset(cpu);
178 }
179}
180
181void cpu_synchronize_post_init(CPUState *cpu)
182{
183 if (cpus_accel->synchronize_post_init) {
184 cpus_accel->synchronize_post_init(cpu);
185 }
186}
187
188void cpu_synchronize_pre_loadvm(CPUState *cpu)
189{
190 if (cpus_accel->synchronize_pre_loadvm) {
191 cpus_accel->synchronize_pre_loadvm(cpu);
192 }
193}
194
195bool cpus_are_resettable(void)
196{
197 if (cpus_accel->cpus_are_resettable) {
198 return cpus_accel->cpus_are_resettable();
199 }
200 return true;
201}
202
203int64_t cpus_get_virtual_clock(void)
204{
205
206
207
208
209
210
211
212
213
214
215
216
217 if (cpus_accel && cpus_accel->get_virtual_clock) {
218 return cpus_accel->get_virtual_clock();
219 }
220 return cpu_get_clock();
221}
222
223
224
225
226
227
228int64_t cpus_get_elapsed_ticks(void)
229{
230 if (cpus_accel->get_elapsed_ticks) {
231 return cpus_accel->get_elapsed_ticks();
232 }
233 return cpu_get_ticks();
234}
235
236static void generic_handle_interrupt(CPUState *cpu, int mask)
237{
238 cpu->interrupt_request |= mask;
239
240 if (!qemu_cpu_is_self(cpu)) {
241 qemu_cpu_kick(cpu);
242 }
243}
244
245void cpu_interrupt(CPUState *cpu, int mask)
246{
247 if (cpus_accel->handle_interrupt) {
248 cpus_accel->handle_interrupt(cpu, mask);
249 } else {
250 generic_handle_interrupt(cpu, mask);
251 }
252}
253
254static int do_vm_stop(RunState state, bool send_stop)
255{
256 int ret = 0;
257
258 if (runstate_is_running()) {
259 runstate_set(state);
260 cpu_disable_ticks();
261 pause_all_vcpus();
262 vm_state_notify(0, state);
263 if (send_stop) {
264 qapi_event_send_stop();
265 }
266 }
267
268 bdrv_drain_all();
269 ret = bdrv_flush_all();
270 trace_vm_stop_flush_all(ret);
271
272 return ret;
273}
274
275
276
277
278int vm_shutdown(void)
279{
280 return do_vm_stop(RUN_STATE_SHUTDOWN, false);
281}
282
283bool cpu_can_run(CPUState *cpu)
284{
285 if (cpu->stop) {
286 return false;
287 }
288 if (cpu_is_stopped(cpu)) {
289 return false;
290 }
291 return true;
292}
293
294void cpu_handle_guest_debug(CPUState *cpu)
295{
296 if (replay_running_debug()) {
297 if (!cpu->singlestep_enabled) {
298
299
300
301
302 replay_breakpoint();
303 cpu_single_step(cpu, SSTEP_ENABLE);
304 } else {
305 cpu_single_step(cpu, 0);
306 }
307 } else {
308 gdb_set_stop_cpu(cpu);
309 qemu_system_debug_request();
310 cpu->stopped = true;
311 }
312}
313
314#ifdef CONFIG_LINUX
315static void sigbus_reraise(void)
316{
317 sigset_t set;
318 struct sigaction action;
319
320 memset(&action, 0, sizeof(action));
321 action.sa_handler = SIG_DFL;
322 if (!sigaction(SIGBUS, &action, NULL)) {
323 raise(SIGBUS);
324 sigemptyset(&set);
325 sigaddset(&set, SIGBUS);
326 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
327 }
328 perror("Failed to re-raise SIGBUS!");
329 abort();
330}
331
332static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
333{
334 if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
335 sigbus_reraise();
336 }
337
338 if (current_cpu) {
339
340 if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) {
341 sigbus_reraise();
342 }
343 } else {
344
345 if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
346 sigbus_reraise();
347 }
348 }
349}
350
351static void qemu_init_sigbus(void)
352{
353 struct sigaction action;
354
355
356
357
358
359 memset(&action, 0, sizeof(action));
360 action.sa_flags = SA_SIGINFO;
361 action.sa_sigaction = sigbus_handler;
362 sigaction(SIGBUS, &action, NULL);
363
364 prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
365}
366#else
367static void qemu_init_sigbus(void)
368{
369}
370#endif
371
372static QemuThread io_thread;
373
374
375static QemuCond qemu_cpu_cond;
376
377static QemuCond qemu_pause_cond;
378
379void qemu_init_cpu_loop(void)
380{
381 qemu_init_sigbus();
382 qemu_cond_init(&qemu_cpu_cond);
383 qemu_cond_init(&qemu_pause_cond);
384 qemu_mutex_init(&qemu_global_mutex);
385
386 qemu_thread_get_self(&io_thread);
387}
388
389void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data)
390{
391 do_run_on_cpu(cpu, func, data, &qemu_global_mutex);
392}
393
394static void qemu_cpu_stop(CPUState *cpu, bool exit)
395{
396 g_assert(qemu_cpu_is_self(cpu));
397 cpu->stop = false;
398 cpu->stopped = true;
399 if (exit) {
400 cpu_exit(cpu);
401 }
402 qemu_cond_broadcast(&qemu_pause_cond);
403}
404
405void qemu_wait_io_event_common(CPUState *cpu)
406{
407 qatomic_mb_set(&cpu->thread_kicked, false);
408 if (cpu->stop) {
409 qemu_cpu_stop(cpu, false);
410 }
411 process_queued_cpu_work(cpu);
412}
413
414void qemu_wait_io_event(CPUState *cpu)
415{
416 bool slept = false;
417
418 while (cpu_thread_is_idle(cpu)) {
419 if (!slept) {
420 slept = true;
421 qemu_plugin_vcpu_idle_cb(cpu);
422 }
423 qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
424 }
425 if (slept) {
426 qemu_plugin_vcpu_resume_cb(cpu);
427 }
428
429#ifdef _WIN32
430
431 if (hax_enabled()) {
432 SleepEx(0, TRUE);
433 }
434#endif
435 qemu_wait_io_event_common(cpu);
436}
437
438void cpus_kick_thread(CPUState *cpu)
439{
440#ifndef _WIN32
441 int err;
442
443 if (cpu->thread_kicked) {
444 return;
445 }
446 cpu->thread_kicked = true;
447 err = pthread_kill(cpu->thread->thread, SIG_IPI);
448 if (err && err != ESRCH) {
449 fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
450 exit(1);
451 }
452#endif
453}
454
455void qemu_cpu_kick(CPUState *cpu)
456{
457 qemu_cond_broadcast(cpu->halt_cond);
458 if (cpus_accel->kick_vcpu_thread) {
459 cpus_accel->kick_vcpu_thread(cpu);
460 } else {
461 cpus_kick_thread(cpu);
462 }
463}
464
465void qemu_cpu_kick_self(void)
466{
467 assert(current_cpu);
468 cpus_kick_thread(current_cpu);
469}
470
471bool qemu_cpu_is_self(CPUState *cpu)
472{
473 return qemu_thread_is_self(cpu->thread);
474}
475
476bool qemu_in_vcpu_thread(void)
477{
478 return current_cpu && qemu_cpu_is_self(current_cpu);
479}
480
481QEMU_DEFINE_STATIC_CO_TLS(bool, iothread_locked)
482
483bool qemu_mutex_iothread_locked(void)
484{
485 return get_iothread_locked();
486}
487
488bool qemu_in_main_thread(void)
489{
490 return qemu_mutex_iothread_locked();
491}
492
493
494
495
496
497void qemu_mutex_lock_iothread_impl(const char *file, int line)
498{
499 QemuMutexLockFunc bql_lock = qatomic_read(&qemu_bql_mutex_lock_func);
500
501 g_assert(!qemu_mutex_iothread_locked());
502 bql_lock(&qemu_global_mutex, file, line);
503 set_iothread_locked(true);
504}
505
506void qemu_mutex_unlock_iothread(void)
507{
508 g_assert(qemu_mutex_iothread_locked());
509 set_iothread_locked(false);
510 qemu_mutex_unlock(&qemu_global_mutex);
511}
512
513void qemu_cond_wait_iothread(QemuCond *cond)
514{
515 qemu_cond_wait(cond, &qemu_global_mutex);
516}
517
518void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
519{
520 qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
521}
522
523
524void cpu_thread_signal_created(CPUState *cpu)
525{
526 cpu->created = true;
527 qemu_cond_signal(&qemu_cpu_cond);
528}
529
530
531void cpu_thread_signal_destroyed(CPUState *cpu)
532{
533 cpu->created = false;
534 qemu_cond_signal(&qemu_cpu_cond);
535}
536
537
538static bool all_vcpus_paused(void)
539{
540 CPUState *cpu;
541
542 CPU_FOREACH(cpu) {
543 if (!cpu->stopped) {
544 return false;
545 }
546 }
547
548 return true;
549}
550
551void pause_all_vcpus(void)
552{
553 CPUState *cpu;
554
555 qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
556 CPU_FOREACH(cpu) {
557 if (qemu_cpu_is_self(cpu)) {
558 qemu_cpu_stop(cpu, true);
559 } else {
560 cpu->stop = true;
561 qemu_cpu_kick(cpu);
562 }
563 }
564
565
566
567
568 replay_mutex_unlock();
569
570 while (!all_vcpus_paused()) {
571 qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
572 CPU_FOREACH(cpu) {
573 qemu_cpu_kick(cpu);
574 }
575 }
576
577 qemu_mutex_unlock_iothread();
578 replay_mutex_lock();
579 qemu_mutex_lock_iothread();
580}
581
582void cpu_resume(CPUState *cpu)
583{
584 cpu->stop = false;
585 cpu->stopped = false;
586 qemu_cpu_kick(cpu);
587}
588
589void resume_all_vcpus(void)
590{
591 CPUState *cpu;
592
593 if (!runstate_is_running()) {
594 return;
595 }
596
597 qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
598 CPU_FOREACH(cpu) {
599 cpu_resume(cpu);
600 }
601}
602
603void cpu_remove_sync(CPUState *cpu)
604{
605 cpu->stop = true;
606 cpu->unplug = true;
607 qemu_cpu_kick(cpu);
608 qemu_mutex_unlock_iothread();
609 qemu_thread_join(cpu->thread);
610 qemu_mutex_lock_iothread();
611}
612
613void cpus_register_accel(const AccelOpsClass *ops)
614{
615 assert(ops != NULL);
616 assert(ops->create_vcpu_thread != NULL);
617 cpus_accel = ops;
618}
619
620void qemu_init_vcpu(CPUState *cpu)
621{
622 MachineState *ms = MACHINE(qdev_get_machine());
623
624 cpu->nr_cores = ms->smp.cores;
625 cpu->nr_threads = ms->smp.threads;
626 cpu->stopped = true;
627 cpu->random_seed = qemu_guest_random_seed_thread_part1();
628
629 if (!cpu->as) {
630
631
632
633 cpu->num_ases = 1;
634 cpu_address_space_init(cpu, 0, "cpu-memory", cpu->memory);
635 }
636
637
638 g_assert(cpus_accel != NULL && cpus_accel->create_vcpu_thread != NULL);
639 cpus_accel->create_vcpu_thread(cpu);
640
641 while (!cpu->created) {
642 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
643 }
644}
645
646void cpu_stop_current(void)
647{
648 if (current_cpu) {
649 current_cpu->stop = true;
650 cpu_exit(current_cpu);
651 }
652}
653
654int vm_stop(RunState state)
655{
656 if (qemu_in_vcpu_thread()) {
657 qemu_system_vmstop_request_prepare();
658 qemu_system_vmstop_request(state);
659
660
661
662
663 cpu_stop_current();
664 return 0;
665 }
666
667 return do_vm_stop(state, true);
668}
669
670
671
672
673
674
675int vm_prepare_start(bool step_pending)
676{
677 RunState requested;
678
679 qemu_vmstop_requested(&requested);
680 if (runstate_is_running() && requested == RUN_STATE__MAX) {
681 return -1;
682 }
683
684
685
686
687
688
689 if (runstate_is_running()) {
690 qapi_event_send_stop();
691 qapi_event_send_resume();
692 return -1;
693 }
694
695
696
697
698
699 if (cpus_accel->synchronize_pre_resume) {
700 cpus_accel->synchronize_pre_resume(step_pending);
701 }
702
703
704 qapi_event_send_resume();
705
706 cpu_enable_ticks();
707 runstate_set(RUN_STATE_RUNNING);
708 vm_state_notify(1, RUN_STATE_RUNNING);
709 return 0;
710}
711
712void vm_start(void)
713{
714 if (!vm_prepare_start(false)) {
715 resume_all_vcpus();
716 }
717}
718
719
720
721int vm_stop_force_state(RunState state)
722{
723 if (runstate_is_running()) {
724 return vm_stop(state);
725 } else {
726 int ret;
727 runstate_set(state);
728
729 bdrv_drain_all();
730
731
732 ret = bdrv_flush_all();
733 trace_vm_stop_flush_all(ret);
734 return ret;
735 }
736}
737
738void qmp_memsave(int64_t addr, int64_t size, const char *filename,
739 bool has_cpu, int64_t cpu_index, Error **errp)
740{
741 FILE *f;
742 uint32_t l;
743 CPUState *cpu;
744 uint8_t buf[1024];
745 int64_t orig_addr = addr, orig_size = size;
746
747 if (!has_cpu) {
748 cpu_index = 0;
749 }
750
751 cpu = qemu_get_cpu(cpu_index);
752 if (cpu == NULL) {
753 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
754 "a CPU number");
755 return;
756 }
757
758 f = fopen(filename, "wb");
759 if (!f) {
760 error_setg_file_open(errp, errno, filename);
761 return;
762 }
763
764 while (size != 0) {
765 l = sizeof(buf);
766 if (l > size)
767 l = size;
768 if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) {
769 error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64
770 " specified", orig_addr, orig_size);
771 goto exit;
772 }
773 if (fwrite(buf, 1, l, f) != l) {
774 error_setg(errp, QERR_IO_ERROR);
775 goto exit;
776 }
777 addr += l;
778 size -= l;
779 }
780
781exit:
782 fclose(f);
783}
784
785void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
786 Error **errp)
787{
788 FILE *f;
789 uint32_t l;
790 uint8_t buf[1024];
791
792 f = fopen(filename, "wb");
793 if (!f) {
794 error_setg_file_open(errp, errno, filename);
795 return;
796 }
797
798 while (size != 0) {
799 l = sizeof(buf);
800 if (l > size)
801 l = size;
802 cpu_physical_memory_read(addr, buf, l);
803 if (fwrite(buf, 1, l, f) != l) {
804 error_setg(errp, QERR_IO_ERROR);
805 goto exit;
806 }
807 addr += l;
808 size -= l;
809 }
810
811exit:
812 fclose(f);
813}
814
815void qmp_inject_nmi(Error **errp)
816{
817 nmi_monitor_handle(monitor_get_cpu_index(monitor_cur()), errp);
818}
819
820