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25#include "qemu/osdep.h"
26#include "qemu-common.h"
27#include "qemu/config-file.h"
28#include "migration/vmstate.h"
29#include "monitor/monitor.h"
30#include "qapi/error.h"
31#include "qapi/qapi-commands-misc.h"
32#include "qapi/qapi-events-run-state.h"
33#include "qapi/qmp/qerror.h"
34#include "qemu/error-report.h"
35#include "qemu/qemu-print.h"
36#include "sysemu/tcg.h"
37#include "sysemu/block-backend.h"
38#include "exec/gdbstub.h"
39#include "sysemu/dma.h"
40#include "sysemu/hw_accel.h"
41#include "sysemu/kvm.h"
42#include "sysemu/hax.h"
43#include "sysemu/hvf.h"
44#include "sysemu/whpx.h"
45#include "exec/exec-all.h"
46
47#include "qemu/thread.h"
48#include "qemu/plugin.h"
49#include "sysemu/cpus.h"
50#include "sysemu/qtest.h"
51#include "qemu/main-loop.h"
52#include "qemu/option.h"
53#include "qemu/bitmap.h"
54#include "qemu/seqlock.h"
55#include "qemu/guest-random.h"
56#include "tcg.h"
57#include "hw/nmi.h"
58#include "sysemu/replay.h"
59#include "sysemu/runstate.h"
60#include "hw/boards.h"
61#include "hw/hw.h"
62
63#ifdef CONFIG_LINUX
64
65#include <sys/prctl.h>
66
67#ifndef PR_MCE_KILL
68#define PR_MCE_KILL 33
69#endif
70
71#ifndef PR_MCE_KILL_SET
72#define PR_MCE_KILL_SET 1
73#endif
74
75#ifndef PR_MCE_KILL_EARLY
76#define PR_MCE_KILL_EARLY 1
77#endif
78
79#endif
80
81static QemuMutex qemu_global_mutex;
82
83int64_t max_delay;
84int64_t max_advance;
85
86
87static QEMUTimer *throttle_timer;
88static unsigned int throttle_percentage;
89
90#define CPU_THROTTLE_PCT_MIN 1
91#define CPU_THROTTLE_PCT_MAX 99
92#define CPU_THROTTLE_TIMESLICE_NS 10000000
93
94bool cpu_is_stopped(CPUState *cpu)
95{
96 return cpu->stopped || !runstate_is_running();
97}
98
99static bool cpu_thread_is_idle(CPUState *cpu)
100{
101 if (cpu->stop || cpu->queued_work_first) {
102 return false;
103 }
104 if (cpu_is_stopped(cpu)) {
105 return true;
106 }
107 if (!cpu->halted || cpu_has_work(cpu) ||
108 kvm_halt_in_kernel()) {
109 return false;
110 }
111 return true;
112}
113
114static bool all_cpu_threads_idle(void)
115{
116 CPUState *cpu;
117
118 CPU_FOREACH(cpu) {
119 if (!cpu_thread_is_idle(cpu)) {
120 return false;
121 }
122 }
123 return true;
124}
125
126
127
128
129
130
131static bool icount_sleep = true;
132
133#define MAX_ICOUNT_SHIFT 10
134
135typedef struct TimersState {
136
137 int64_t cpu_ticks_prev;
138 int64_t cpu_ticks_offset;
139
140
141
142
143 QemuSeqLock vm_clock_seqlock;
144 QemuSpin vm_clock_lock;
145
146 int16_t cpu_ticks_enabled;
147
148
149 int16_t icount_time_shift;
150
151
152 int64_t qemu_icount_bias;
153
154 int64_t vm_clock_warp_start;
155 int64_t cpu_clock_offset;
156
157
158 int64_t qemu_icount;
159
160
161 QEMUTimer *icount_rt_timer;
162 QEMUTimer *icount_vm_timer;
163 QEMUTimer *icount_warp_timer;
164} TimersState;
165
166static TimersState timers_state;
167bool mttcg_enabled;
168
169
170
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186
187
188
189static bool check_tcg_memory_orders_compatible(void)
190{
191#if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO)
192 return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0;
193#else
194 return false;
195#endif
196}
197
198static bool default_mttcg_enabled(void)
199{
200 if (use_icount || TCG_OVERSIZED_GUEST) {
201 return false;
202 } else {
203#ifdef TARGET_SUPPORTS_MTTCG
204 return check_tcg_memory_orders_compatible();
205#else
206 return false;
207#endif
208 }
209}
210
211void qemu_tcg_configure(QemuOpts *opts, Error **errp)
212{
213 const char *t = qemu_opt_get(opts, "thread");
214 if (t) {
215 if (strcmp(t, "multi") == 0) {
216 if (TCG_OVERSIZED_GUEST) {
217 error_setg(errp, "No MTTCG when guest word size > hosts");
218 } else if (use_icount) {
219 error_setg(errp, "No MTTCG when icount is enabled");
220 } else {
221#ifndef TARGET_SUPPORTS_MTTCG
222 warn_report("Guest not yet converted to MTTCG - "
223 "you may get unexpected results");
224#endif
225 if (!check_tcg_memory_orders_compatible()) {
226 warn_report("Guest expects a stronger memory ordering "
227 "than the host provides");
228 error_printf("This may cause strange/hard to debug errors\n");
229 }
230 mttcg_enabled = true;
231 }
232 } else if (strcmp(t, "single") == 0) {
233 mttcg_enabled = false;
234 } else {
235 error_setg(errp, "Invalid 'thread' setting %s", t);
236 }
237 } else {
238 mttcg_enabled = default_mttcg_enabled();
239 }
240}
241
242
243
244
245
246static int64_t cpu_get_icount_executed(CPUState *cpu)
247{
248 return (cpu->icount_budget -
249 (cpu_neg(cpu)->icount_decr.u16.low + cpu->icount_extra));
250}
251
252
253
254
255
256
257static void cpu_update_icount_locked(CPUState *cpu)
258{
259 int64_t executed = cpu_get_icount_executed(cpu);
260 cpu->icount_budget -= executed;
261
262 atomic_set_i64(&timers_state.qemu_icount,
263 timers_state.qemu_icount + executed);
264}
265
266
267
268
269
270
271void cpu_update_icount(CPUState *cpu)
272{
273 seqlock_write_lock(&timers_state.vm_clock_seqlock,
274 &timers_state.vm_clock_lock);
275 cpu_update_icount_locked(cpu);
276 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
277 &timers_state.vm_clock_lock);
278}
279
280static int64_t cpu_get_icount_raw_locked(void)
281{
282 CPUState *cpu = current_cpu;
283
284 if (cpu && cpu->running) {
285 if (!cpu->can_do_io) {
286 error_report("Bad icount read");
287 exit(1);
288 }
289
290 cpu_update_icount_locked(cpu);
291 }
292
293 return atomic_read_i64(&timers_state.qemu_icount);
294}
295
296static int64_t cpu_get_icount_locked(void)
297{
298 int64_t icount = cpu_get_icount_raw_locked();
299 return atomic_read_i64(&timers_state.qemu_icount_bias) +
300 cpu_icount_to_ns(icount);
301}
302
303int64_t cpu_get_icount_raw(void)
304{
305 int64_t icount;
306 unsigned start;
307
308 do {
309 start = seqlock_read_begin(&timers_state.vm_clock_seqlock);
310 icount = cpu_get_icount_raw_locked();
311 } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start));
312
313 return icount;
314}
315
316
317int64_t cpu_get_icount(void)
318{
319 int64_t icount;
320 unsigned start;
321
322 do {
323 start = seqlock_read_begin(&timers_state.vm_clock_seqlock);
324 icount = cpu_get_icount_locked();
325 } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start));
326
327 return icount;
328}
329
330int64_t cpu_icount_to_ns(int64_t icount)
331{
332 return icount << atomic_read(&timers_state.icount_time_shift);
333}
334
335static int64_t cpu_get_ticks_locked(void)
336{
337 int64_t ticks = timers_state.cpu_ticks_offset;
338 if (timers_state.cpu_ticks_enabled) {
339 ticks += cpu_get_host_ticks();
340 }
341
342 if (timers_state.cpu_ticks_prev > ticks) {
343
344 timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks;
345 ticks = timers_state.cpu_ticks_prev;
346 }
347
348 timers_state.cpu_ticks_prev = ticks;
349 return ticks;
350}
351
352
353
354
355
356int64_t cpu_get_ticks(void)
357{
358 int64_t ticks;
359
360 if (use_icount) {
361 return cpu_get_icount();
362 }
363
364 qemu_spin_lock(&timers_state.vm_clock_lock);
365 ticks = cpu_get_ticks_locked();
366 qemu_spin_unlock(&timers_state.vm_clock_lock);
367 return ticks;
368}
369
370static int64_t cpu_get_clock_locked(void)
371{
372 int64_t time;
373
374 time = timers_state.cpu_clock_offset;
375 if (timers_state.cpu_ticks_enabled) {
376 time += get_clock();
377 }
378
379 return time;
380}
381
382
383
384
385int64_t cpu_get_clock(void)
386{
387 int64_t ti;
388 unsigned start;
389
390 do {
391 start = seqlock_read_begin(&timers_state.vm_clock_seqlock);
392 ti = cpu_get_clock_locked();
393 } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start));
394
395 return ti;
396}
397
398
399
400
401void cpu_enable_ticks(void)
402{
403 seqlock_write_lock(&timers_state.vm_clock_seqlock,
404 &timers_state.vm_clock_lock);
405 if (!timers_state.cpu_ticks_enabled) {
406 timers_state.cpu_ticks_offset -= cpu_get_host_ticks();
407 timers_state.cpu_clock_offset -= get_clock();
408 timers_state.cpu_ticks_enabled = 1;
409 }
410 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
411 &timers_state.vm_clock_lock);
412}
413
414
415
416
417
418void cpu_disable_ticks(void)
419{
420 seqlock_write_lock(&timers_state.vm_clock_seqlock,
421 &timers_state.vm_clock_lock);
422 if (timers_state.cpu_ticks_enabled) {
423 timers_state.cpu_ticks_offset += cpu_get_host_ticks();
424 timers_state.cpu_clock_offset = cpu_get_clock_locked();
425 timers_state.cpu_ticks_enabled = 0;
426 }
427 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
428 &timers_state.vm_clock_lock);
429}
430
431
432
433
434
435#define ICOUNT_WOBBLE (NANOSECONDS_PER_SECOND / 10)
436
437static void icount_adjust(void)
438{
439 int64_t cur_time;
440 int64_t cur_icount;
441 int64_t delta;
442
443
444 static int64_t last_delta;
445
446
447 if (!runstate_is_running()) {
448 return;
449 }
450
451 seqlock_write_lock(&timers_state.vm_clock_seqlock,
452 &timers_state.vm_clock_lock);
453 cur_time = cpu_get_clock_locked();
454 cur_icount = cpu_get_icount_locked();
455
456 delta = cur_icount - cur_time;
457
458 if (delta > 0
459 && last_delta + ICOUNT_WOBBLE < delta * 2
460 && timers_state.icount_time_shift > 0) {
461
462 atomic_set(&timers_state.icount_time_shift,
463 timers_state.icount_time_shift - 1);
464 }
465 if (delta < 0
466 && last_delta - ICOUNT_WOBBLE > delta * 2
467 && timers_state.icount_time_shift < MAX_ICOUNT_SHIFT) {
468
469 atomic_set(&timers_state.icount_time_shift,
470 timers_state.icount_time_shift + 1);
471 }
472 last_delta = delta;
473 atomic_set_i64(&timers_state.qemu_icount_bias,
474 cur_icount - (timers_state.qemu_icount
475 << timers_state.icount_time_shift));
476 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
477 &timers_state.vm_clock_lock);
478}
479
480static void icount_adjust_rt(void *opaque)
481{
482 timer_mod(timers_state.icount_rt_timer,
483 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000);
484 icount_adjust();
485}
486
487static void icount_adjust_vm(void *opaque)
488{
489 timer_mod(timers_state.icount_vm_timer,
490 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
491 NANOSECONDS_PER_SECOND / 10);
492 icount_adjust();
493}
494
495static int64_t qemu_icount_round(int64_t count)
496{
497 int shift = atomic_read(&timers_state.icount_time_shift);
498 return (count + (1 << shift) - 1) >> shift;
499}
500
501static void icount_warp_rt(void)
502{
503 unsigned seq;
504 int64_t warp_start;
505
506
507
508
509 do {
510 seq = seqlock_read_begin(&timers_state.vm_clock_seqlock);
511 warp_start = timers_state.vm_clock_warp_start;
512 } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, seq));
513
514 if (warp_start == -1) {
515 return;
516 }
517
518 seqlock_write_lock(&timers_state.vm_clock_seqlock,
519 &timers_state.vm_clock_lock);
520 if (runstate_is_running()) {
521 int64_t clock = REPLAY_CLOCK_LOCKED(REPLAY_CLOCK_VIRTUAL_RT,
522 cpu_get_clock_locked());
523 int64_t warp_delta;
524
525 warp_delta = clock - timers_state.vm_clock_warp_start;
526 if (use_icount == 2) {
527
528
529
530
531 int64_t cur_icount = cpu_get_icount_locked();
532 int64_t delta = clock - cur_icount;
533 warp_delta = MIN(warp_delta, delta);
534 }
535 atomic_set_i64(&timers_state.qemu_icount_bias,
536 timers_state.qemu_icount_bias + warp_delta);
537 }
538 timers_state.vm_clock_warp_start = -1;
539 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
540 &timers_state.vm_clock_lock);
541
542 if (qemu_clock_expired(QEMU_CLOCK_VIRTUAL)) {
543 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
544 }
545}
546
547static void icount_timer_cb(void *opaque)
548{
549
550
551
552 icount_warp_rt();
553}
554
555void qtest_clock_warp(int64_t dest)
556{
557 int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
558 AioContext *aio_context;
559 assert(qtest_enabled());
560 aio_context = qemu_get_aio_context();
561 while (clock < dest) {
562 int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
563 QEMU_TIMER_ATTR_ALL);
564 int64_t warp = qemu_soonest_timeout(dest - clock, deadline);
565
566 seqlock_write_lock(&timers_state.vm_clock_seqlock,
567 &timers_state.vm_clock_lock);
568 atomic_set_i64(&timers_state.qemu_icount_bias,
569 timers_state.qemu_icount_bias + warp);
570 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
571 &timers_state.vm_clock_lock);
572
573 qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
574 timerlist_run_timers(aio_context->tlg.tl[QEMU_CLOCK_VIRTUAL]);
575 clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
576 }
577 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
578}
579
580void qemu_start_warp_timer(void)
581{
582 int64_t clock;
583 int64_t deadline;
584
585 if (!use_icount) {
586 return;
587 }
588
589
590
591
592 if (!runstate_is_running()) {
593 return;
594 }
595
596 if (replay_mode != REPLAY_MODE_PLAY) {
597 if (!all_cpu_threads_idle()) {
598 return;
599 }
600
601 if (qtest_enabled()) {
602
603 return;
604 }
605
606 replay_checkpoint(CHECKPOINT_CLOCK_WARP_START);
607 } else {
608
609 if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_START)) {
610
611
612
613
614 if (replay_has_checkpoint()) {
615 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
616 }
617 return;
618 }
619 }
620
621
622 clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT);
623 deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
624 ~QEMU_TIMER_ATTR_EXTERNAL);
625 if (deadline < 0) {
626 static bool notified;
627 if (!icount_sleep && !notified) {
628 warn_report("icount sleep disabled and no active timers");
629 notified = true;
630 }
631 return;
632 }
633
634 if (deadline > 0) {
635
636
637
638
639
640
641
642 if (!icount_sleep) {
643
644
645
646
647
648
649
650 seqlock_write_lock(&timers_state.vm_clock_seqlock,
651 &timers_state.vm_clock_lock);
652 atomic_set_i64(&timers_state.qemu_icount_bias,
653 timers_state.qemu_icount_bias + deadline);
654 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
655 &timers_state.vm_clock_lock);
656 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
657 } else {
658
659
660
661
662
663
664
665
666 seqlock_write_lock(&timers_state.vm_clock_seqlock,
667 &timers_state.vm_clock_lock);
668 if (timers_state.vm_clock_warp_start == -1
669 || timers_state.vm_clock_warp_start > clock) {
670 timers_state.vm_clock_warp_start = clock;
671 }
672 seqlock_write_unlock(&timers_state.vm_clock_seqlock,
673 &timers_state.vm_clock_lock);
674 timer_mod_anticipate(timers_state.icount_warp_timer,
675 clock + deadline);
676 }
677 } else if (deadline == 0) {
678 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
679 }
680}
681
682static void qemu_account_warp_timer(void)
683{
684 if (!use_icount || !icount_sleep) {
685 return;
686 }
687
688
689
690
691 if (!runstate_is_running()) {
692 return;
693 }
694
695
696 if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP_ACCOUNT)) {
697 return;
698 }
699
700 timer_del(timers_state.icount_warp_timer);
701 icount_warp_rt();
702}
703
704static bool icount_state_needed(void *opaque)
705{
706 return use_icount;
707}
708
709static bool warp_timer_state_needed(void *opaque)
710{
711 TimersState *s = opaque;
712 return s->icount_warp_timer != NULL;
713}
714
715static bool adjust_timers_state_needed(void *opaque)
716{
717 TimersState *s = opaque;
718 return s->icount_rt_timer != NULL;
719}
720
721
722
723
724static const VMStateDescription icount_vmstate_warp_timer = {
725 .name = "timer/icount/warp_timer",
726 .version_id = 1,
727 .minimum_version_id = 1,
728 .needed = warp_timer_state_needed,
729 .fields = (VMStateField[]) {
730 VMSTATE_INT64(vm_clock_warp_start, TimersState),
731 VMSTATE_TIMER_PTR(icount_warp_timer, TimersState),
732 VMSTATE_END_OF_LIST()
733 }
734};
735
736static const VMStateDescription icount_vmstate_adjust_timers = {
737 .name = "timer/icount/timers",
738 .version_id = 1,
739 .minimum_version_id = 1,
740 .needed = adjust_timers_state_needed,
741 .fields = (VMStateField[]) {
742 VMSTATE_TIMER_PTR(icount_rt_timer, TimersState),
743 VMSTATE_TIMER_PTR(icount_vm_timer, TimersState),
744 VMSTATE_END_OF_LIST()
745 }
746};
747
748
749
750
751static const VMStateDescription icount_vmstate_timers = {
752 .name = "timer/icount",
753 .version_id = 1,
754 .minimum_version_id = 1,
755 .needed = icount_state_needed,
756 .fields = (VMStateField[]) {
757 VMSTATE_INT64(qemu_icount_bias, TimersState),
758 VMSTATE_INT64(qemu_icount, TimersState),
759 VMSTATE_END_OF_LIST()
760 },
761 .subsections = (const VMStateDescription*[]) {
762 &icount_vmstate_warp_timer,
763 &icount_vmstate_adjust_timers,
764 NULL
765 }
766};
767
768static const VMStateDescription vmstate_timers = {
769 .name = "timer",
770 .version_id = 2,
771 .minimum_version_id = 1,
772 .fields = (VMStateField[]) {
773 VMSTATE_INT64(cpu_ticks_offset, TimersState),
774 VMSTATE_UNUSED(8),
775 VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
776 VMSTATE_END_OF_LIST()
777 },
778 .subsections = (const VMStateDescription*[]) {
779 &icount_vmstate_timers,
780 NULL
781 }
782};
783
784static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque)
785{
786 double pct;
787 double throttle_ratio;
788 int64_t sleeptime_ns, endtime_ns;
789
790 if (!cpu_throttle_get_percentage()) {
791 return;
792 }
793
794 pct = (double)cpu_throttle_get_percentage()/100;
795 throttle_ratio = pct / (1 - pct);
796
797 sleeptime_ns = (int64_t)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS + 1);
798 endtime_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + sleeptime_ns;
799 while (sleeptime_ns > 0 && !cpu->stop) {
800 if (sleeptime_ns > SCALE_MS) {
801 qemu_cond_timedwait(cpu->halt_cond, &qemu_global_mutex,
802 sleeptime_ns / SCALE_MS);
803 } else {
804 qemu_mutex_unlock_iothread();
805 g_usleep(sleeptime_ns / SCALE_US);
806 qemu_mutex_lock_iothread();
807 }
808 sleeptime_ns = endtime_ns - qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
809 }
810 atomic_set(&cpu->throttle_thread_scheduled, 0);
811}
812
813static void cpu_throttle_timer_tick(void *opaque)
814{
815 CPUState *cpu;
816 double pct;
817
818
819 if (!cpu_throttle_get_percentage()) {
820 return;
821 }
822 CPU_FOREACH(cpu) {
823 if (!atomic_xchg(&cpu->throttle_thread_scheduled, 1)) {
824 async_run_on_cpu(cpu, cpu_throttle_thread,
825 RUN_ON_CPU_NULL);
826 }
827 }
828
829 pct = (double)cpu_throttle_get_percentage()/100;
830 timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) +
831 CPU_THROTTLE_TIMESLICE_NS / (1-pct));
832}
833
834void cpu_throttle_set(int new_throttle_pct)
835{
836
837 new_throttle_pct = MIN(new_throttle_pct, CPU_THROTTLE_PCT_MAX);
838 new_throttle_pct = MAX(new_throttle_pct, CPU_THROTTLE_PCT_MIN);
839
840 atomic_set(&throttle_percentage, new_throttle_pct);
841
842 timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) +
843 CPU_THROTTLE_TIMESLICE_NS);
844}
845
846void cpu_throttle_stop(void)
847{
848 atomic_set(&throttle_percentage, 0);
849}
850
851bool cpu_throttle_active(void)
852{
853 return (cpu_throttle_get_percentage() != 0);
854}
855
856int cpu_throttle_get_percentage(void)
857{
858 return atomic_read(&throttle_percentage);
859}
860
861void cpu_ticks_init(void)
862{
863 seqlock_init(&timers_state.vm_clock_seqlock);
864 qemu_spin_init(&timers_state.vm_clock_lock);
865 vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
866 throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
867 cpu_throttle_timer_tick, NULL);
868}
869
870void configure_icount(QemuOpts *opts, Error **errp)
871{
872 const char *option;
873 char *rem_str = NULL;
874
875 option = qemu_opt_get(opts, "shift");
876 if (!option) {
877 if (qemu_opt_get(opts, "align") != NULL) {
878 error_setg(errp, "Please specify shift option when using align");
879 }
880 return;
881 }
882
883 icount_sleep = qemu_opt_get_bool(opts, "sleep", true);
884 if (icount_sleep) {
885 timers_state.icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
886 icount_timer_cb, NULL);
887 }
888
889 icount_align_option = qemu_opt_get_bool(opts, "align", false);
890
891 if (icount_align_option && !icount_sleep) {
892 error_setg(errp, "align=on and sleep=off are incompatible");
893 }
894 if (strcmp(option, "auto") != 0) {
895 errno = 0;
896 timers_state.icount_time_shift = strtol(option, &rem_str, 0);
897 if (errno != 0 || *rem_str != '\0' || !strlen(option)) {
898 error_setg(errp, "icount: Invalid shift value");
899 }
900 use_icount = 1;
901 return;
902 } else if (icount_align_option) {
903 error_setg(errp, "shift=auto and align=on are incompatible");
904 } else if (!icount_sleep) {
905 error_setg(errp, "shift=auto and sleep=off are incompatible");
906 }
907
908 use_icount = 2;
909
910
911
912 timers_state.icount_time_shift = 3;
913
914
915
916
917
918
919 timers_state.vm_clock_warp_start = -1;
920 timers_state.icount_rt_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL_RT,
921 icount_adjust_rt, NULL);
922 timer_mod(timers_state.icount_rt_timer,
923 qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL_RT) + 1000);
924 timers_state.icount_vm_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
925 icount_adjust_vm, NULL);
926 timer_mod(timers_state.icount_vm_timer,
927 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) +
928 NANOSECONDS_PER_SECOND / 10);
929}
930
931
932
933
934
935
936
937
938
939
940
941
942
943static QEMUTimer *tcg_kick_vcpu_timer;
944static CPUState *tcg_current_rr_cpu;
945
946#define TCG_KICK_PERIOD (NANOSECONDS_PER_SECOND / 10)
947
948static inline int64_t qemu_tcg_next_kick(void)
949{
950 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + TCG_KICK_PERIOD;
951}
952
953
954static void qemu_cpu_kick_rr_next_cpu(void)
955{
956 CPUState *cpu;
957 do {
958 cpu = atomic_mb_read(&tcg_current_rr_cpu);
959 if (cpu) {
960 cpu_exit(cpu);
961 }
962 } while (cpu != atomic_mb_read(&tcg_current_rr_cpu));
963}
964
965
966static void qemu_cpu_kick_rr_cpus(void)
967{
968 CPUState *cpu;
969
970 CPU_FOREACH(cpu) {
971 cpu_exit(cpu);
972 };
973}
974
975static void do_nothing(CPUState *cpu, run_on_cpu_data unused)
976{
977}
978
979void qemu_timer_notify_cb(void *opaque, QEMUClockType type)
980{
981 if (!use_icount || type != QEMU_CLOCK_VIRTUAL) {
982 qemu_notify_event();
983 return;
984 }
985
986 if (qemu_in_vcpu_thread()) {
987
988
989
990
991 qemu_cpu_kick(current_cpu);
992 } else if (first_cpu) {
993
994
995
996
997
998
999
1000 async_run_on_cpu(first_cpu, do_nothing, RUN_ON_CPU_NULL);
1001 }
1002}
1003
1004static void kick_tcg_thread(void *opaque)
1005{
1006 timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick());
1007 qemu_cpu_kick_rr_next_cpu();
1008}
1009
1010static void start_tcg_kick_timer(void)
1011{
1012 assert(!mttcg_enabled);
1013 if (!tcg_kick_vcpu_timer && CPU_NEXT(first_cpu)) {
1014 tcg_kick_vcpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
1015 kick_tcg_thread, NULL);
1016 }
1017 if (tcg_kick_vcpu_timer && !timer_pending(tcg_kick_vcpu_timer)) {
1018 timer_mod(tcg_kick_vcpu_timer, qemu_tcg_next_kick());
1019 }
1020}
1021
1022static void stop_tcg_kick_timer(void)
1023{
1024 assert(!mttcg_enabled);
1025 if (tcg_kick_vcpu_timer && timer_pending(tcg_kick_vcpu_timer)) {
1026 timer_del(tcg_kick_vcpu_timer);
1027 }
1028}
1029
1030
1031void hw_error(const char *fmt, ...)
1032{
1033 va_list ap;
1034 CPUState *cpu;
1035
1036 va_start(ap, fmt);
1037 fprintf(stderr, "qemu: hardware error: ");
1038 vfprintf(stderr, fmt, ap);
1039 fprintf(stderr, "\n");
1040 CPU_FOREACH(cpu) {
1041 fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
1042 cpu_dump_state(cpu, stderr, CPU_DUMP_FPU);
1043 }
1044 va_end(ap);
1045 abort();
1046}
1047
1048void cpu_synchronize_all_states(void)
1049{
1050 CPUState *cpu;
1051
1052 CPU_FOREACH(cpu) {
1053 cpu_synchronize_state(cpu);
1054
1055 if (hvf_enabled()) {
1056 hvf_cpu_synchronize_state(cpu);
1057 }
1058 }
1059}
1060
1061void cpu_synchronize_all_post_reset(void)
1062{
1063 CPUState *cpu;
1064
1065 CPU_FOREACH(cpu) {
1066 cpu_synchronize_post_reset(cpu);
1067
1068 if (hvf_enabled()) {
1069 hvf_cpu_synchronize_post_reset(cpu);
1070 }
1071 }
1072}
1073
1074void cpu_synchronize_all_post_init(void)
1075{
1076 CPUState *cpu;
1077
1078 CPU_FOREACH(cpu) {
1079 cpu_synchronize_post_init(cpu);
1080
1081 if (hvf_enabled()) {
1082 hvf_cpu_synchronize_post_init(cpu);
1083 }
1084 }
1085}
1086
1087void cpu_synchronize_all_pre_loadvm(void)
1088{
1089 CPUState *cpu;
1090
1091 CPU_FOREACH(cpu) {
1092 cpu_synchronize_pre_loadvm(cpu);
1093 }
1094}
1095
1096static int do_vm_stop(RunState state, bool send_stop)
1097{
1098 int ret = 0;
1099
1100 if (runstate_is_running()) {
1101 cpu_disable_ticks();
1102 pause_all_vcpus();
1103 runstate_set(state);
1104 vm_state_notify(0, state);
1105 if (send_stop) {
1106 qapi_event_send_stop();
1107 }
1108 }
1109
1110 bdrv_drain_all();
1111 ret = bdrv_flush_all();
1112
1113 return ret;
1114}
1115
1116
1117
1118
1119int vm_shutdown(void)
1120{
1121 return do_vm_stop(RUN_STATE_SHUTDOWN, false);
1122}
1123
1124static bool cpu_can_run(CPUState *cpu)
1125{
1126 if (cpu->stop) {
1127 return false;
1128 }
1129 if (cpu_is_stopped(cpu)) {
1130 return false;
1131 }
1132 return true;
1133}
1134
1135static void cpu_handle_guest_debug(CPUState *cpu)
1136{
1137 gdb_set_stop_cpu(cpu);
1138 qemu_system_debug_request();
1139 cpu->stopped = true;
1140}
1141
1142#ifdef CONFIG_LINUX
1143static void sigbus_reraise(void)
1144{
1145 sigset_t set;
1146 struct sigaction action;
1147
1148 memset(&action, 0, sizeof(action));
1149 action.sa_handler = SIG_DFL;
1150 if (!sigaction(SIGBUS, &action, NULL)) {
1151 raise(SIGBUS);
1152 sigemptyset(&set);
1153 sigaddset(&set, SIGBUS);
1154 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
1155 }
1156 perror("Failed to re-raise SIGBUS!\n");
1157 abort();
1158}
1159
1160static void sigbus_handler(int n, siginfo_t *siginfo, void *ctx)
1161{
1162 if (siginfo->si_code != BUS_MCEERR_AO && siginfo->si_code != BUS_MCEERR_AR) {
1163 sigbus_reraise();
1164 }
1165
1166 if (current_cpu) {
1167
1168 if (kvm_on_sigbus_vcpu(current_cpu, siginfo->si_code, siginfo->si_addr)) {
1169 sigbus_reraise();
1170 }
1171 } else {
1172
1173 if (kvm_on_sigbus(siginfo->si_code, siginfo->si_addr)) {
1174 sigbus_reraise();
1175 }
1176 }
1177}
1178
1179static void qemu_init_sigbus(void)
1180{
1181 struct sigaction action;
1182
1183 memset(&action, 0, sizeof(action));
1184 action.sa_flags = SA_SIGINFO;
1185 action.sa_sigaction = sigbus_handler;
1186 sigaction(SIGBUS, &action, NULL);
1187
1188 prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
1189}
1190#else
1191static void qemu_init_sigbus(void)
1192{
1193}
1194#endif
1195
1196static QemuThread io_thread;
1197
1198
1199static QemuCond qemu_cpu_cond;
1200
1201static QemuCond qemu_pause_cond;
1202
1203void qemu_init_cpu_loop(void)
1204{
1205 qemu_init_sigbus();
1206 qemu_cond_init(&qemu_cpu_cond);
1207 qemu_cond_init(&qemu_pause_cond);
1208 qemu_mutex_init(&qemu_global_mutex);
1209
1210 qemu_thread_get_self(&io_thread);
1211}
1212
1213void run_on_cpu(CPUState *cpu, run_on_cpu_func func, run_on_cpu_data data)
1214{
1215 do_run_on_cpu(cpu, func, data, &qemu_global_mutex);
1216}
1217
1218static void qemu_kvm_destroy_vcpu(CPUState *cpu)
1219{
1220 if (kvm_destroy_vcpu(cpu) < 0) {
1221 error_report("kvm_destroy_vcpu failed");
1222 exit(EXIT_FAILURE);
1223 }
1224}
1225
1226static void qemu_tcg_destroy_vcpu(CPUState *cpu)
1227{
1228}
1229
1230static void qemu_cpu_stop(CPUState *cpu, bool exit)
1231{
1232 g_assert(qemu_cpu_is_self(cpu));
1233 cpu->stop = false;
1234 cpu->stopped = true;
1235 if (exit) {
1236 cpu_exit(cpu);
1237 }
1238 qemu_cond_broadcast(&qemu_pause_cond);
1239}
1240
1241static void qemu_wait_io_event_common(CPUState *cpu)
1242{
1243 atomic_mb_set(&cpu->thread_kicked, false);
1244 if (cpu->stop) {
1245 qemu_cpu_stop(cpu, false);
1246 }
1247 process_queued_cpu_work(cpu);
1248}
1249
1250static void qemu_tcg_rr_wait_io_event(void)
1251{
1252 CPUState *cpu;
1253
1254 while (all_cpu_threads_idle()) {
1255 stop_tcg_kick_timer();
1256 qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex);
1257 }
1258
1259 start_tcg_kick_timer();
1260
1261 CPU_FOREACH(cpu) {
1262 qemu_wait_io_event_common(cpu);
1263 }
1264}
1265
1266static void qemu_wait_io_event(CPUState *cpu)
1267{
1268 bool slept = false;
1269
1270 while (cpu_thread_is_idle(cpu)) {
1271 if (!slept) {
1272 slept = true;
1273 qemu_plugin_vcpu_idle_cb(cpu);
1274 }
1275 qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
1276 }
1277 if (slept) {
1278 qemu_plugin_vcpu_resume_cb(cpu);
1279 }
1280
1281#ifdef _WIN32
1282
1283 if (!tcg_enabled()) {
1284 SleepEx(0, TRUE);
1285 }
1286#endif
1287 qemu_wait_io_event_common(cpu);
1288}
1289
1290static void *qemu_kvm_cpu_thread_fn(void *arg)
1291{
1292 CPUState *cpu = arg;
1293 int r;
1294
1295 rcu_register_thread();
1296
1297 qemu_mutex_lock_iothread();
1298 qemu_thread_get_self(cpu->thread);
1299 cpu->thread_id = qemu_get_thread_id();
1300 cpu->can_do_io = 1;
1301 current_cpu = cpu;
1302
1303 r = kvm_init_vcpu(cpu);
1304 if (r < 0) {
1305 error_report("kvm_init_vcpu failed: %s", strerror(-r));
1306 exit(1);
1307 }
1308
1309 kvm_init_cpu_signals(cpu);
1310
1311
1312 cpu->created = true;
1313 qemu_cond_signal(&qemu_cpu_cond);
1314 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1315
1316 do {
1317 if (cpu_can_run(cpu)) {
1318 r = kvm_cpu_exec(cpu);
1319 if (r == EXCP_DEBUG) {
1320 cpu_handle_guest_debug(cpu);
1321 }
1322 }
1323 qemu_wait_io_event(cpu);
1324 } while (!cpu->unplug || cpu_can_run(cpu));
1325
1326 qemu_kvm_destroy_vcpu(cpu);
1327 cpu->created = false;
1328 qemu_cond_signal(&qemu_cpu_cond);
1329 qemu_mutex_unlock_iothread();
1330 rcu_unregister_thread();
1331 return NULL;
1332}
1333
1334static void *qemu_dummy_cpu_thread_fn(void *arg)
1335{
1336#ifdef _WIN32
1337 error_report("qtest is not supported under Windows");
1338 exit(1);
1339#else
1340 CPUState *cpu = arg;
1341 sigset_t waitset;
1342 int r;
1343
1344 rcu_register_thread();
1345
1346 qemu_mutex_lock_iothread();
1347 qemu_thread_get_self(cpu->thread);
1348 cpu->thread_id = qemu_get_thread_id();
1349 cpu->can_do_io = 1;
1350 current_cpu = cpu;
1351
1352 sigemptyset(&waitset);
1353 sigaddset(&waitset, SIG_IPI);
1354
1355
1356 cpu->created = true;
1357 qemu_cond_signal(&qemu_cpu_cond);
1358 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1359
1360 do {
1361 qemu_mutex_unlock_iothread();
1362 do {
1363 int sig;
1364 r = sigwait(&waitset, &sig);
1365 } while (r == -1 && (errno == EAGAIN || errno == EINTR));
1366 if (r == -1) {
1367 perror("sigwait");
1368 exit(1);
1369 }
1370 qemu_mutex_lock_iothread();
1371 qemu_wait_io_event(cpu);
1372 } while (!cpu->unplug);
1373
1374 qemu_mutex_unlock_iothread();
1375 rcu_unregister_thread();
1376 return NULL;
1377#endif
1378}
1379
1380static int64_t tcg_get_icount_limit(void)
1381{
1382 int64_t deadline;
1383
1384 if (replay_mode != REPLAY_MODE_PLAY) {
1385
1386
1387
1388
1389 deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
1390 QEMU_TIMER_ATTR_ALL);
1391
1392
1393
1394
1395
1396
1397 if ((deadline < 0) || (deadline > INT32_MAX)) {
1398 deadline = INT32_MAX;
1399 }
1400
1401 return qemu_icount_round(deadline);
1402 } else {
1403 return replay_get_instructions();
1404 }
1405}
1406
1407static void handle_icount_deadline(void)
1408{
1409 assert(qemu_in_vcpu_thread());
1410 if (use_icount) {
1411 int64_t deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL,
1412 QEMU_TIMER_ATTR_ALL);
1413
1414 if (deadline == 0) {
1415
1416 qemu_clock_notify(QEMU_CLOCK_VIRTUAL);
1417 qemu_clock_run_timers(QEMU_CLOCK_VIRTUAL);
1418 }
1419 }
1420}
1421
1422static void prepare_icount_for_run(CPUState *cpu)
1423{
1424 if (use_icount) {
1425 int insns_left;
1426
1427
1428
1429
1430
1431 g_assert(cpu_neg(cpu)->icount_decr.u16.low == 0);
1432 g_assert(cpu->icount_extra == 0);
1433
1434 cpu->icount_budget = tcg_get_icount_limit();
1435 insns_left = MIN(0xffff, cpu->icount_budget);
1436 cpu_neg(cpu)->icount_decr.u16.low = insns_left;
1437 cpu->icount_extra = cpu->icount_budget - insns_left;
1438
1439 replay_mutex_lock();
1440 }
1441}
1442
1443static void process_icount_data(CPUState *cpu)
1444{
1445 if (use_icount) {
1446
1447 cpu_update_icount(cpu);
1448
1449
1450 cpu_neg(cpu)->icount_decr.u16.low = 0;
1451 cpu->icount_extra = 0;
1452 cpu->icount_budget = 0;
1453
1454 replay_account_executed_instructions();
1455
1456 replay_mutex_unlock();
1457 }
1458}
1459
1460
1461static int tcg_cpu_exec(CPUState *cpu)
1462{
1463 int ret;
1464#ifdef CONFIG_PROFILER
1465 int64_t ti;
1466#endif
1467
1468 assert(tcg_enabled());
1469#ifdef CONFIG_PROFILER
1470 ti = profile_getclock();
1471#endif
1472 cpu_exec_start(cpu);
1473 ret = cpu_exec(cpu);
1474 cpu_exec_end(cpu);
1475#ifdef CONFIG_PROFILER
1476 atomic_set(&tcg_ctx->prof.cpu_exec_time,
1477 tcg_ctx->prof.cpu_exec_time + profile_getclock() - ti);
1478#endif
1479 return ret;
1480}
1481
1482
1483
1484
1485static void deal_with_unplugged_cpus(void)
1486{
1487 CPUState *cpu;
1488
1489 CPU_FOREACH(cpu) {
1490 if (cpu->unplug && !cpu_can_run(cpu)) {
1491 qemu_tcg_destroy_vcpu(cpu);
1492 cpu->created = false;
1493 qemu_cond_signal(&qemu_cpu_cond);
1494 break;
1495 }
1496 }
1497}
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508static void *qemu_tcg_rr_cpu_thread_fn(void *arg)
1509{
1510 CPUState *cpu = arg;
1511
1512 assert(tcg_enabled());
1513 rcu_register_thread();
1514 tcg_register_thread();
1515
1516 qemu_mutex_lock_iothread();
1517 qemu_thread_get_self(cpu->thread);
1518
1519 cpu->thread_id = qemu_get_thread_id();
1520 cpu->created = true;
1521 cpu->can_do_io = 1;
1522 qemu_cond_signal(&qemu_cpu_cond);
1523 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1524
1525
1526 while (first_cpu->stopped) {
1527 qemu_cond_wait(first_cpu->halt_cond, &qemu_global_mutex);
1528
1529
1530 CPU_FOREACH(cpu) {
1531 current_cpu = cpu;
1532 qemu_wait_io_event_common(cpu);
1533 }
1534 }
1535
1536 start_tcg_kick_timer();
1537
1538 cpu = first_cpu;
1539
1540
1541 cpu->exit_request = 1;
1542
1543 while (1) {
1544 qemu_mutex_unlock_iothread();
1545 replay_mutex_lock();
1546 qemu_mutex_lock_iothread();
1547
1548 qemu_account_warp_timer();
1549
1550
1551
1552
1553 handle_icount_deadline();
1554
1555 replay_mutex_unlock();
1556
1557 if (!cpu) {
1558 cpu = first_cpu;
1559 }
1560
1561 while (cpu && !cpu->queued_work_first && !cpu->exit_request) {
1562
1563 atomic_mb_set(&tcg_current_rr_cpu, cpu);
1564 current_cpu = cpu;
1565
1566 qemu_clock_enable(QEMU_CLOCK_VIRTUAL,
1567 (cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
1568
1569 if (cpu_can_run(cpu)) {
1570 int r;
1571
1572 qemu_mutex_unlock_iothread();
1573 prepare_icount_for_run(cpu);
1574
1575 r = tcg_cpu_exec(cpu);
1576
1577 process_icount_data(cpu);
1578 qemu_mutex_lock_iothread();
1579
1580 if (r == EXCP_DEBUG) {
1581 cpu_handle_guest_debug(cpu);
1582 break;
1583 } else if (r == EXCP_ATOMIC) {
1584 qemu_mutex_unlock_iothread();
1585 cpu_exec_step_atomic(cpu);
1586 qemu_mutex_lock_iothread();
1587 break;
1588 }
1589 } else if (cpu->stop) {
1590 if (cpu->unplug) {
1591 cpu = CPU_NEXT(cpu);
1592 }
1593 break;
1594 }
1595
1596 cpu = CPU_NEXT(cpu);
1597 }
1598
1599
1600 atomic_set(&tcg_current_rr_cpu, NULL);
1601
1602 if (cpu && cpu->exit_request) {
1603 atomic_mb_set(&cpu->exit_request, 0);
1604 }
1605
1606 if (use_icount && all_cpu_threads_idle()) {
1607
1608
1609
1610
1611 qemu_notify_event();
1612 }
1613
1614 qemu_tcg_rr_wait_io_event();
1615 deal_with_unplugged_cpus();
1616 }
1617
1618 rcu_unregister_thread();
1619 return NULL;
1620}
1621
1622static void *qemu_hax_cpu_thread_fn(void *arg)
1623{
1624 CPUState *cpu = arg;
1625 int r;
1626
1627 rcu_register_thread();
1628 qemu_mutex_lock_iothread();
1629 qemu_thread_get_self(cpu->thread);
1630
1631 cpu->thread_id = qemu_get_thread_id();
1632 cpu->created = true;
1633 current_cpu = cpu;
1634
1635 hax_init_vcpu(cpu);
1636 qemu_cond_signal(&qemu_cpu_cond);
1637 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1638
1639 do {
1640 if (cpu_can_run(cpu)) {
1641 r = hax_smp_cpu_exec(cpu);
1642 if (r == EXCP_DEBUG) {
1643 cpu_handle_guest_debug(cpu);
1644 }
1645 }
1646
1647 qemu_wait_io_event(cpu);
1648 } while (!cpu->unplug || cpu_can_run(cpu));
1649 rcu_unregister_thread();
1650 return NULL;
1651}
1652
1653
1654
1655static void *qemu_hvf_cpu_thread_fn(void *arg)
1656{
1657 CPUState *cpu = arg;
1658
1659 int r;
1660
1661 assert(hvf_enabled());
1662
1663 rcu_register_thread();
1664
1665 qemu_mutex_lock_iothread();
1666 qemu_thread_get_self(cpu->thread);
1667
1668 cpu->thread_id = qemu_get_thread_id();
1669 cpu->can_do_io = 1;
1670 current_cpu = cpu;
1671
1672 hvf_init_vcpu(cpu);
1673
1674
1675 cpu->created = true;
1676 qemu_cond_signal(&qemu_cpu_cond);
1677 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1678
1679 do {
1680 if (cpu_can_run(cpu)) {
1681 r = hvf_vcpu_exec(cpu);
1682 if (r == EXCP_DEBUG) {
1683 cpu_handle_guest_debug(cpu);
1684 }
1685 }
1686 qemu_wait_io_event(cpu);
1687 } while (!cpu->unplug || cpu_can_run(cpu));
1688
1689 hvf_vcpu_destroy(cpu);
1690 cpu->created = false;
1691 qemu_cond_signal(&qemu_cpu_cond);
1692 qemu_mutex_unlock_iothread();
1693 rcu_unregister_thread();
1694 return NULL;
1695}
1696
1697static void *qemu_whpx_cpu_thread_fn(void *arg)
1698{
1699 CPUState *cpu = arg;
1700 int r;
1701
1702 rcu_register_thread();
1703
1704 qemu_mutex_lock_iothread();
1705 qemu_thread_get_self(cpu->thread);
1706 cpu->thread_id = qemu_get_thread_id();
1707 current_cpu = cpu;
1708
1709 r = whpx_init_vcpu(cpu);
1710 if (r < 0) {
1711 fprintf(stderr, "whpx_init_vcpu failed: %s\n", strerror(-r));
1712 exit(1);
1713 }
1714
1715
1716 cpu->created = true;
1717 qemu_cond_signal(&qemu_cpu_cond);
1718 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1719
1720 do {
1721 if (cpu_can_run(cpu)) {
1722 r = whpx_vcpu_exec(cpu);
1723 if (r == EXCP_DEBUG) {
1724 cpu_handle_guest_debug(cpu);
1725 }
1726 }
1727 while (cpu_thread_is_idle(cpu)) {
1728 qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
1729 }
1730 qemu_wait_io_event_common(cpu);
1731 } while (!cpu->unplug || cpu_can_run(cpu));
1732
1733 whpx_destroy_vcpu(cpu);
1734 cpu->created = false;
1735 qemu_cond_signal(&qemu_cpu_cond);
1736 qemu_mutex_unlock_iothread();
1737 rcu_unregister_thread();
1738 return NULL;
1739}
1740
1741#ifdef _WIN32
1742static void CALLBACK dummy_apc_func(ULONG_PTR unused)
1743{
1744}
1745#endif
1746
1747
1748
1749
1750
1751
1752
1753
1754static void *qemu_tcg_cpu_thread_fn(void *arg)
1755{
1756 CPUState *cpu = arg;
1757
1758 assert(tcg_enabled());
1759 g_assert(!use_icount);
1760
1761 rcu_register_thread();
1762 tcg_register_thread();
1763
1764 qemu_mutex_lock_iothread();
1765 qemu_thread_get_self(cpu->thread);
1766
1767 cpu->thread_id = qemu_get_thread_id();
1768 cpu->created = true;
1769 cpu->can_do_io = 1;
1770 current_cpu = cpu;
1771 qemu_cond_signal(&qemu_cpu_cond);
1772 qemu_guest_random_seed_thread_part2(cpu->random_seed);
1773
1774
1775 cpu->exit_request = 1;
1776
1777 do {
1778 if (cpu_can_run(cpu)) {
1779 int r;
1780 qemu_mutex_unlock_iothread();
1781 r = tcg_cpu_exec(cpu);
1782 qemu_mutex_lock_iothread();
1783 switch (r) {
1784 case EXCP_DEBUG:
1785 cpu_handle_guest_debug(cpu);
1786 break;
1787 case EXCP_HALTED:
1788
1789
1790
1791
1792
1793
1794
1795 g_assert(cpu->halted);
1796 break;
1797 case EXCP_ATOMIC:
1798 qemu_mutex_unlock_iothread();
1799 cpu_exec_step_atomic(cpu);
1800 qemu_mutex_lock_iothread();
1801 default:
1802
1803 break;
1804 }
1805 }
1806
1807 atomic_mb_set(&cpu->exit_request, 0);
1808 qemu_wait_io_event(cpu);
1809 } while (!cpu->unplug || cpu_can_run(cpu));
1810
1811 qemu_tcg_destroy_vcpu(cpu);
1812 cpu->created = false;
1813 qemu_cond_signal(&qemu_cpu_cond);
1814 qemu_mutex_unlock_iothread();
1815 rcu_unregister_thread();
1816 return NULL;
1817}
1818
1819static void qemu_cpu_kick_thread(CPUState *cpu)
1820{
1821#ifndef _WIN32
1822 int err;
1823
1824 if (cpu->thread_kicked) {
1825 return;
1826 }
1827 cpu->thread_kicked = true;
1828 err = pthread_kill(cpu->thread->thread, SIG_IPI);
1829 if (err && err != ESRCH) {
1830 fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
1831 exit(1);
1832 }
1833#else
1834 if (!qemu_cpu_is_self(cpu)) {
1835 if (whpx_enabled()) {
1836 whpx_vcpu_kick(cpu);
1837 } else if (!QueueUserAPC(dummy_apc_func, cpu->hThread, 0)) {
1838 fprintf(stderr, "%s: QueueUserAPC failed with error %lu\n",
1839 __func__, GetLastError());
1840 exit(1);
1841 }
1842 }
1843#endif
1844}
1845
1846void qemu_cpu_kick(CPUState *cpu)
1847{
1848 qemu_cond_broadcast(cpu->halt_cond);
1849 if (tcg_enabled()) {
1850 if (qemu_tcg_mttcg_enabled()) {
1851 cpu_exit(cpu);
1852 } else {
1853 qemu_cpu_kick_rr_cpus();
1854 }
1855 } else {
1856 if (hax_enabled()) {
1857
1858
1859
1860
1861 cpu->exit_request = 1;
1862 }
1863 qemu_cpu_kick_thread(cpu);
1864 }
1865}
1866
1867void qemu_cpu_kick_self(void)
1868{
1869 assert(current_cpu);
1870 qemu_cpu_kick_thread(current_cpu);
1871}
1872
1873bool qemu_cpu_is_self(CPUState *cpu)
1874{
1875 return qemu_thread_is_self(cpu->thread);
1876}
1877
1878bool qemu_in_vcpu_thread(void)
1879{
1880 return current_cpu && qemu_cpu_is_self(current_cpu);
1881}
1882
1883static __thread bool iothread_locked = false;
1884
1885bool qemu_mutex_iothread_locked(void)
1886{
1887 return iothread_locked;
1888}
1889
1890
1891
1892
1893
1894void qemu_mutex_lock_iothread_impl(const char *file, int line)
1895{
1896 QemuMutexLockFunc bql_lock = atomic_read(&qemu_bql_mutex_lock_func);
1897
1898 g_assert(!qemu_mutex_iothread_locked());
1899 bql_lock(&qemu_global_mutex, file, line);
1900 iothread_locked = true;
1901}
1902
1903void qemu_mutex_unlock_iothread(void)
1904{
1905 g_assert(qemu_mutex_iothread_locked());
1906 iothread_locked = false;
1907 qemu_mutex_unlock(&qemu_global_mutex);
1908}
1909
1910static bool all_vcpus_paused(void)
1911{
1912 CPUState *cpu;
1913
1914 CPU_FOREACH(cpu) {
1915 if (!cpu->stopped) {
1916 return false;
1917 }
1918 }
1919
1920 return true;
1921}
1922
1923void pause_all_vcpus(void)
1924{
1925 CPUState *cpu;
1926
1927 qemu_clock_enable(QEMU_CLOCK_VIRTUAL, false);
1928 CPU_FOREACH(cpu) {
1929 if (qemu_cpu_is_self(cpu)) {
1930 qemu_cpu_stop(cpu, true);
1931 } else {
1932 cpu->stop = true;
1933 qemu_cpu_kick(cpu);
1934 }
1935 }
1936
1937
1938
1939
1940 replay_mutex_unlock();
1941
1942 while (!all_vcpus_paused()) {
1943 qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
1944 CPU_FOREACH(cpu) {
1945 qemu_cpu_kick(cpu);
1946 }
1947 }
1948
1949 qemu_mutex_unlock_iothread();
1950 replay_mutex_lock();
1951 qemu_mutex_lock_iothread();
1952}
1953
1954void cpu_resume(CPUState *cpu)
1955{
1956 cpu->stop = false;
1957 cpu->stopped = false;
1958 qemu_cpu_kick(cpu);
1959}
1960
1961void resume_all_vcpus(void)
1962{
1963 CPUState *cpu;
1964
1965 qemu_clock_enable(QEMU_CLOCK_VIRTUAL, true);
1966 CPU_FOREACH(cpu) {
1967 cpu_resume(cpu);
1968 }
1969}
1970
1971void cpu_remove_sync(CPUState *cpu)
1972{
1973 cpu->stop = true;
1974 cpu->unplug = true;
1975 qemu_cpu_kick(cpu);
1976 qemu_mutex_unlock_iothread();
1977 qemu_thread_join(cpu->thread);
1978 qemu_mutex_lock_iothread();
1979}
1980
1981
1982#define VCPU_THREAD_NAME_SIZE 16
1983
1984static void qemu_tcg_init_vcpu(CPUState *cpu)
1985{
1986 char thread_name[VCPU_THREAD_NAME_SIZE];
1987 static QemuCond *single_tcg_halt_cond;
1988 static QemuThread *single_tcg_cpu_thread;
1989 static int tcg_region_inited;
1990
1991 assert(tcg_enabled());
1992
1993
1994
1995
1996
1997
1998 if (!tcg_region_inited) {
1999 tcg_region_inited = 1;
2000 tcg_region_init();
2001 }
2002
2003 if (qemu_tcg_mttcg_enabled() || !single_tcg_cpu_thread) {
2004 cpu->thread = g_malloc0(sizeof(QemuThread));
2005 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
2006 qemu_cond_init(cpu->halt_cond);
2007
2008 if (qemu_tcg_mttcg_enabled()) {
2009
2010 parallel_cpus = true;
2011 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/TCG",
2012 cpu->cpu_index);
2013
2014 qemu_thread_create(cpu->thread, thread_name, qemu_tcg_cpu_thread_fn,
2015 cpu, QEMU_THREAD_JOINABLE);
2016
2017 } else {
2018
2019 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "ALL CPUs/TCG");
2020 qemu_thread_create(cpu->thread, thread_name,
2021 qemu_tcg_rr_cpu_thread_fn,
2022 cpu, QEMU_THREAD_JOINABLE);
2023
2024 single_tcg_halt_cond = cpu->halt_cond;
2025 single_tcg_cpu_thread = cpu->thread;
2026 }
2027#ifdef _WIN32
2028 cpu->hThread = qemu_thread_get_handle(cpu->thread);
2029#endif
2030 } else {
2031
2032 cpu->thread = single_tcg_cpu_thread;
2033 cpu->halt_cond = single_tcg_halt_cond;
2034 cpu->thread_id = first_cpu->thread_id;
2035 cpu->can_do_io = 1;
2036 cpu->created = true;
2037 }
2038}
2039
2040static void qemu_hax_start_vcpu(CPUState *cpu)
2041{
2042 char thread_name[VCPU_THREAD_NAME_SIZE];
2043
2044 cpu->thread = g_malloc0(sizeof(QemuThread));
2045 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
2046 qemu_cond_init(cpu->halt_cond);
2047
2048 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HAX",
2049 cpu->cpu_index);
2050 qemu_thread_create(cpu->thread, thread_name, qemu_hax_cpu_thread_fn,
2051 cpu, QEMU_THREAD_JOINABLE);
2052#ifdef _WIN32
2053 cpu->hThread = qemu_thread_get_handle(cpu->thread);
2054#endif
2055}
2056
2057static void qemu_kvm_start_vcpu(CPUState *cpu)
2058{
2059 char thread_name[VCPU_THREAD_NAME_SIZE];
2060
2061 cpu->thread = g_malloc0(sizeof(QemuThread));
2062 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
2063 qemu_cond_init(cpu->halt_cond);
2064 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM",
2065 cpu->cpu_index);
2066 qemu_thread_create(cpu->thread, thread_name, qemu_kvm_cpu_thread_fn,
2067 cpu, QEMU_THREAD_JOINABLE);
2068}
2069
2070static void qemu_hvf_start_vcpu(CPUState *cpu)
2071{
2072 char thread_name[VCPU_THREAD_NAME_SIZE];
2073
2074
2075
2076 assert(hvf_enabled());
2077
2078 cpu->thread = g_malloc0(sizeof(QemuThread));
2079 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
2080 qemu_cond_init(cpu->halt_cond);
2081
2082 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/HVF",
2083 cpu->cpu_index);
2084 qemu_thread_create(cpu->thread, thread_name, qemu_hvf_cpu_thread_fn,
2085 cpu, QEMU_THREAD_JOINABLE);
2086}
2087
2088static void qemu_whpx_start_vcpu(CPUState *cpu)
2089{
2090 char thread_name[VCPU_THREAD_NAME_SIZE];
2091
2092 cpu->thread = g_malloc0(sizeof(QemuThread));
2093 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
2094 qemu_cond_init(cpu->halt_cond);
2095 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/WHPX",
2096 cpu->cpu_index);
2097 qemu_thread_create(cpu->thread, thread_name, qemu_whpx_cpu_thread_fn,
2098 cpu, QEMU_THREAD_JOINABLE);
2099#ifdef _WIN32
2100 cpu->hThread = qemu_thread_get_handle(cpu->thread);
2101#endif
2102}
2103
2104static void qemu_dummy_start_vcpu(CPUState *cpu)
2105{
2106 char thread_name[VCPU_THREAD_NAME_SIZE];
2107
2108 cpu->thread = g_malloc0(sizeof(QemuThread));
2109 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
2110 qemu_cond_init(cpu->halt_cond);
2111 snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/DUMMY",
2112 cpu->cpu_index);
2113 qemu_thread_create(cpu->thread, thread_name, qemu_dummy_cpu_thread_fn, cpu,
2114 QEMU_THREAD_JOINABLE);
2115}
2116
2117void qemu_init_vcpu(CPUState *cpu)
2118{
2119 MachineState *ms = MACHINE(qdev_get_machine());
2120
2121 cpu->nr_cores = ms->smp.cores;
2122 cpu->nr_threads = ms->smp.threads;
2123 cpu->stopped = true;
2124 cpu->random_seed = qemu_guest_random_seed_thread_part1();
2125
2126 if (!cpu->as) {
2127
2128
2129
2130 cpu->num_ases = 1;
2131 cpu_address_space_init(cpu, 0, "cpu-memory", cpu->memory);
2132 }
2133
2134 if (kvm_enabled()) {
2135 qemu_kvm_start_vcpu(cpu);
2136 } else if (hax_enabled()) {
2137 qemu_hax_start_vcpu(cpu);
2138 } else if (hvf_enabled()) {
2139 qemu_hvf_start_vcpu(cpu);
2140 } else if (tcg_enabled()) {
2141 qemu_tcg_init_vcpu(cpu);
2142 } else if (whpx_enabled()) {
2143 qemu_whpx_start_vcpu(cpu);
2144 } else {
2145 qemu_dummy_start_vcpu(cpu);
2146 }
2147
2148 while (!cpu->created) {
2149 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
2150 }
2151}
2152
2153void cpu_stop_current(void)
2154{
2155 if (current_cpu) {
2156 current_cpu->stop = true;
2157 cpu_exit(current_cpu);
2158 }
2159}
2160
2161int vm_stop(RunState state)
2162{
2163 if (qemu_in_vcpu_thread()) {
2164 qemu_system_vmstop_request_prepare();
2165 qemu_system_vmstop_request(state);
2166
2167
2168
2169
2170 cpu_stop_current();
2171 return 0;
2172 }
2173
2174 return do_vm_stop(state, true);
2175}
2176
2177
2178
2179
2180
2181
2182int vm_prepare_start(void)
2183{
2184 RunState requested;
2185
2186 qemu_vmstop_requested(&requested);
2187 if (runstate_is_running() && requested == RUN_STATE__MAX) {
2188 return -1;
2189 }
2190
2191
2192
2193
2194
2195
2196 if (runstate_is_running()) {
2197 qapi_event_send_stop();
2198 qapi_event_send_resume();
2199 return -1;
2200 }
2201
2202
2203 qapi_event_send_resume();
2204
2205 cpu_enable_ticks();
2206 runstate_set(RUN_STATE_RUNNING);
2207 vm_state_notify(1, RUN_STATE_RUNNING);
2208 return 0;
2209}
2210
2211void vm_start(void)
2212{
2213 if (!vm_prepare_start()) {
2214 resume_all_vcpus();
2215 }
2216}
2217
2218
2219
2220int vm_stop_force_state(RunState state)
2221{
2222 if (runstate_is_running()) {
2223 return vm_stop(state);
2224 } else {
2225 runstate_set(state);
2226
2227 bdrv_drain_all();
2228
2229
2230 return bdrv_flush_all();
2231 }
2232}
2233
2234void list_cpus(const char *optarg)
2235{
2236
2237#if defined(cpu_list)
2238 cpu_list();
2239#endif
2240}
2241
2242void qmp_memsave(int64_t addr, int64_t size, const char *filename,
2243 bool has_cpu, int64_t cpu_index, Error **errp)
2244{
2245 FILE *f;
2246 uint32_t l;
2247 CPUState *cpu;
2248 uint8_t buf[1024];
2249 int64_t orig_addr = addr, orig_size = size;
2250
2251 if (!has_cpu) {
2252 cpu_index = 0;
2253 }
2254
2255 cpu = qemu_get_cpu(cpu_index);
2256 if (cpu == NULL) {
2257 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
2258 "a CPU number");
2259 return;
2260 }
2261
2262 f = fopen(filename, "wb");
2263 if (!f) {
2264 error_setg_file_open(errp, errno, filename);
2265 return;
2266 }
2267
2268 while (size != 0) {
2269 l = sizeof(buf);
2270 if (l > size)
2271 l = size;
2272 if (cpu_memory_rw_debug(cpu, addr, buf, l, 0) != 0) {
2273 error_setg(errp, "Invalid addr 0x%016" PRIx64 "/size %" PRId64
2274 " specified", orig_addr, orig_size);
2275 goto exit;
2276 }
2277 if (fwrite(buf, 1, l, f) != l) {
2278 error_setg(errp, QERR_IO_ERROR);
2279 goto exit;
2280 }
2281 addr += l;
2282 size -= l;
2283 }
2284
2285exit:
2286 fclose(f);
2287}
2288
2289void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
2290 Error **errp)
2291{
2292 FILE *f;
2293 uint32_t l;
2294 uint8_t buf[1024];
2295
2296 f = fopen(filename, "wb");
2297 if (!f) {
2298 error_setg_file_open(errp, errno, filename);
2299 return;
2300 }
2301
2302 while (size != 0) {
2303 l = sizeof(buf);
2304 if (l > size)
2305 l = size;
2306 cpu_physical_memory_read(addr, buf, l);
2307 if (fwrite(buf, 1, l, f) != l) {
2308 error_setg(errp, QERR_IO_ERROR);
2309 goto exit;
2310 }
2311 addr += l;
2312 size -= l;
2313 }
2314
2315exit:
2316 fclose(f);
2317}
2318
2319void qmp_inject_nmi(Error **errp)
2320{
2321 nmi_monitor_handle(monitor_get_cpu_index(), errp);
2322}
2323
2324void dump_drift_info(void)
2325{
2326 if (!use_icount) {
2327 return;
2328 }
2329
2330 qemu_printf("Host - Guest clock %"PRIi64" ms\n",
2331 (cpu_get_clock() - cpu_get_icount())/SCALE_MS);
2332 if (icount_align_option) {
2333 qemu_printf("Max guest delay %"PRIi64" ms\n",
2334 -max_delay / SCALE_MS);
2335 qemu_printf("Max guest advance %"PRIi64" ms\n",
2336 max_advance / SCALE_MS);
2337 } else {
2338 qemu_printf("Max guest delay NA\n");
2339 qemu_printf("Max guest advance NA\n");
2340 }
2341}
2342