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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 /* Needed early for CONFIG_BSD etc. */
26 #include "config-host.h"
27
28 #include "monitor/monitor.h"
29 #include "sysemu/sysemu.h"
30 #include "exec/gdbstub.h"
31 #include "sysemu/dma.h"
32 #include "sysemu/kvm.h"
33 #include "qmp-commands.h"
34
35 #include "qemu/thread.h"
36 #include "sysemu/cpus.h"
37 #include "sysemu/qtest.h"
38 #include "qemu/main-loop.h"
39 #include "qemu/bitmap.h"
40
41 #ifndef _WIN32
42 #include "qemu/compatfd.h"
43 #endif
44
45 #ifdef CONFIG_LINUX
46
47 #include <sys/prctl.h>
48
49 #ifndef PR_MCE_KILL
50 #define PR_MCE_KILL 33
51 #endif
52
53 #ifndef PR_MCE_KILL_SET
54 #define PR_MCE_KILL_SET 1
55 #endif
56
57 #ifndef PR_MCE_KILL_EARLY
58 #define PR_MCE_KILL_EARLY 1
59 #endif
60
61 #endif /* CONFIG_LINUX */
62
63 static CPUArchState *next_cpu;
64
65 static bool cpu_thread_is_idle(CPUArchState *env)
66 {
67 CPUState *cpu = ENV_GET_CPU(env);
68
69 if (cpu->stop || cpu->queued_work_first) {
70 return false;
71 }
72 if (cpu->stopped || !runstate_is_running()) {
73 return true;
74 }
75 if (!cpu->halted || qemu_cpu_has_work(cpu) ||
76 kvm_async_interrupts_enabled()) {
77 return false;
78 }
79 return true;
80 }
81
82 static bool all_cpu_threads_idle(void)
83 {
84 CPUArchState *env;
85
86 for (env = first_cpu; env != NULL; env = env->next_cpu) {
87 if (!cpu_thread_is_idle(env)) {
88 return false;
89 }
90 }
91 return true;
92 }
93
94 /***********************************************************/
95 /* guest cycle counter */
96
97 /* Conversion factor from emulated instructions to virtual clock ticks. */
98 static int icount_time_shift;
99 /* Arbitrarily pick 1MIPS as the minimum allowable speed. */
100 #define MAX_ICOUNT_SHIFT 10
101 /* Compensate for varying guest execution speed. */
102 static int64_t qemu_icount_bias;
103 static QEMUTimer *icount_rt_timer;
104 static QEMUTimer *icount_vm_timer;
105 static QEMUTimer *icount_warp_timer;
106 static int64_t vm_clock_warp_start;
107 static int64_t qemu_icount;
108
109 typedef struct TimersState {
110 int64_t cpu_ticks_prev;
111 int64_t cpu_ticks_offset;
112 int64_t cpu_clock_offset;
113 int32_t cpu_ticks_enabled;
114 int64_t dummy;
115 } TimersState;
116
117 TimersState timers_state;
118
119 /* Return the virtual CPU time, based on the instruction counter. */
120 int64_t cpu_get_icount(void)
121 {
122 int64_t icount;
123 CPUArchState *env = cpu_single_env;
124
125 icount = qemu_icount;
126 if (env) {
127 if (!can_do_io(env)) {
128 fprintf(stderr, "Bad clock read\n");
129 }
130 icount -= (env->icount_decr.u16.low + env->icount_extra);
131 }
132 return qemu_icount_bias + (icount << icount_time_shift);
133 }
134
135 /* return the host CPU cycle counter and handle stop/restart */
136 int64_t cpu_get_ticks(void)
137 {
138 if (use_icount) {
139 return cpu_get_icount();
140 }
141 if (!timers_state.cpu_ticks_enabled) {
142 return timers_state.cpu_ticks_offset;
143 } else {
144 int64_t ticks;
145 ticks = cpu_get_real_ticks();
146 if (timers_state.cpu_ticks_prev > ticks) {
147 /* Note: non increasing ticks may happen if the host uses
148 software suspend */
149 timers_state.cpu_ticks_offset += timers_state.cpu_ticks_prev - ticks;
150 }
151 timers_state.cpu_ticks_prev = ticks;
152 return ticks + timers_state.cpu_ticks_offset;
153 }
154 }
155
156 /* return the host CPU monotonic timer and handle stop/restart */
157 int64_t cpu_get_clock(void)
158 {
159 int64_t ti;
160 if (!timers_state.cpu_ticks_enabled) {
161 return timers_state.cpu_clock_offset;
162 } else {
163 ti = get_clock();
164 return ti + timers_state.cpu_clock_offset;
165 }
166 }
167
168 /* enable cpu_get_ticks() */
169 void cpu_enable_ticks(void)
170 {
171 if (!timers_state.cpu_ticks_enabled) {
172 timers_state.cpu_ticks_offset -= cpu_get_real_ticks();
173 timers_state.cpu_clock_offset -= get_clock();
174 timers_state.cpu_ticks_enabled = 1;
175 }
176 }
177
178 /* disable cpu_get_ticks() : the clock is stopped. You must not call
179 cpu_get_ticks() after that. */
180 void cpu_disable_ticks(void)
181 {
182 if (timers_state.cpu_ticks_enabled) {
183 timers_state.cpu_ticks_offset = cpu_get_ticks();
184 timers_state.cpu_clock_offset = cpu_get_clock();
185 timers_state.cpu_ticks_enabled = 0;
186 }
187 }
188
189 /* Correlation between real and virtual time is always going to be
190 fairly approximate, so ignore small variation.
191 When the guest is idle real and virtual time will be aligned in
192 the IO wait loop. */
193 #define ICOUNT_WOBBLE (get_ticks_per_sec() / 10)
194
195 static void icount_adjust(void)
196 {
197 int64_t cur_time;
198 int64_t cur_icount;
199 int64_t delta;
200 static int64_t last_delta;
201 /* If the VM is not running, then do nothing. */
202 if (!runstate_is_running()) {
203 return;
204 }
205 cur_time = cpu_get_clock();
206 cur_icount = qemu_get_clock_ns(vm_clock);
207 delta = cur_icount - cur_time;
208 /* FIXME: This is a very crude algorithm, somewhat prone to oscillation. */
209 if (delta > 0
210 && last_delta + ICOUNT_WOBBLE < delta * 2
211 && icount_time_shift > 0) {
212 /* The guest is getting too far ahead. Slow time down. */
213 icount_time_shift--;
214 }
215 if (delta < 0
216 && last_delta - ICOUNT_WOBBLE > delta * 2
217 && icount_time_shift < MAX_ICOUNT_SHIFT) {
218 /* The guest is getting too far behind. Speed time up. */
219 icount_time_shift++;
220 }
221 last_delta = delta;
222 qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
223 }
224
225 static void icount_adjust_rt(void *opaque)
226 {
227 qemu_mod_timer(icount_rt_timer,
228 qemu_get_clock_ms(rt_clock) + 1000);
229 icount_adjust();
230 }
231
232 static void icount_adjust_vm(void *opaque)
233 {
234 qemu_mod_timer(icount_vm_timer,
235 qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
236 icount_adjust();
237 }
238
239 static int64_t qemu_icount_round(int64_t count)
240 {
241 return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
242 }
243
244 static void icount_warp_rt(void *opaque)
245 {
246 if (vm_clock_warp_start == -1) {
247 return;
248 }
249
250 if (runstate_is_running()) {
251 int64_t clock = qemu_get_clock_ns(rt_clock);
252 int64_t warp_delta = clock - vm_clock_warp_start;
253 if (use_icount == 1) {
254 qemu_icount_bias += warp_delta;
255 } else {
256 /*
257 * In adaptive mode, do not let the vm_clock run too
258 * far ahead of real time.
259 */
260 int64_t cur_time = cpu_get_clock();
261 int64_t cur_icount = qemu_get_clock_ns(vm_clock);
262 int64_t delta = cur_time - cur_icount;
263 qemu_icount_bias += MIN(warp_delta, delta);
264 }
265 if (qemu_clock_expired(vm_clock)) {
266 qemu_notify_event();
267 }
268 }
269 vm_clock_warp_start = -1;
270 }
271
272 void qtest_clock_warp(int64_t dest)
273 {
274 int64_t clock = qemu_get_clock_ns(vm_clock);
275 assert(qtest_enabled());
276 while (clock < dest) {
277 int64_t deadline = qemu_clock_deadline(vm_clock);
278 int64_t warp = MIN(dest - clock, deadline);
279 qemu_icount_bias += warp;
280 qemu_run_timers(vm_clock);
281 clock = qemu_get_clock_ns(vm_clock);
282 }
283 qemu_notify_event();
284 }
285
286 void qemu_clock_warp(QEMUClock *clock)
287 {
288 int64_t deadline;
289
290 /*
291 * There are too many global variables to make the "warp" behavior
292 * applicable to other clocks. But a clock argument removes the
293 * need for if statements all over the place.
294 */
295 if (clock != vm_clock || !use_icount) {
296 return;
297 }
298
299 /*
300 * If the CPUs have been sleeping, advance the vm_clock timer now. This
301 * ensures that the deadline for the timer is computed correctly below.
302 * This also makes sure that the insn counter is synchronized before the
303 * CPU starts running, in case the CPU is woken by an event other than
304 * the earliest vm_clock timer.
305 */
306 icount_warp_rt(NULL);
307 if (!all_cpu_threads_idle() || !qemu_clock_has_timers(vm_clock)) {
308 qemu_del_timer(icount_warp_timer);
309 return;
310 }
311
312 if (qtest_enabled()) {
313 /* When testing, qtest commands advance icount. */
314 return;
315 }
316
317 vm_clock_warp_start = qemu_get_clock_ns(rt_clock);
318 deadline = qemu_clock_deadline(vm_clock);
319 if (deadline > 0) {
320 /*
321 * Ensure the vm_clock proceeds even when the virtual CPU goes to
322 * sleep. Otherwise, the CPU might be waiting for a future timer
323 * interrupt to wake it up, but the interrupt never comes because
324 * the vCPU isn't running any insns and thus doesn't advance the
325 * vm_clock.
326 *
327 * An extreme solution for this problem would be to never let VCPUs
328 * sleep in icount mode if there is a pending vm_clock timer; rather
329 * time could just advance to the next vm_clock event. Instead, we
330 * do stop VCPUs and only advance vm_clock after some "real" time,
331 * (related to the time left until the next event) has passed. This
332 * rt_clock timer will do this. This avoids that the warps are too
333 * visible externally---for example, you will not be sending network
334 * packets continuously instead of every 100ms.
335 */
336 qemu_mod_timer(icount_warp_timer, vm_clock_warp_start + deadline);
337 } else {
338 qemu_notify_event();
339 }
340 }
341
342 static const VMStateDescription vmstate_timers = {
343 .name = "timer",
344 .version_id = 2,
345 .minimum_version_id = 1,
346 .minimum_version_id_old = 1,
347 .fields = (VMStateField[]) {
348 VMSTATE_INT64(cpu_ticks_offset, TimersState),
349 VMSTATE_INT64(dummy, TimersState),
350 VMSTATE_INT64_V(cpu_clock_offset, TimersState, 2),
351 VMSTATE_END_OF_LIST()
352 }
353 };
354
355 void configure_icount(const char *option)
356 {
357 vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
358 if (!option) {
359 return;
360 }
361
362 icount_warp_timer = qemu_new_timer_ns(rt_clock, icount_warp_rt, NULL);
363 if (strcmp(option, "auto") != 0) {
364 icount_time_shift = strtol(option, NULL, 0);
365 use_icount = 1;
366 return;
367 }
368
369 use_icount = 2;
370
371 /* 125MIPS seems a reasonable initial guess at the guest speed.
372 It will be corrected fairly quickly anyway. */
373 icount_time_shift = 3;
374
375 /* Have both realtime and virtual time triggers for speed adjustment.
376 The realtime trigger catches emulated time passing too slowly,
377 the virtual time trigger catches emulated time passing too fast.
378 Realtime triggers occur even when idle, so use them less frequently
379 than VM triggers. */
380 icount_rt_timer = qemu_new_timer_ms(rt_clock, icount_adjust_rt, NULL);
381 qemu_mod_timer(icount_rt_timer,
382 qemu_get_clock_ms(rt_clock) + 1000);
383 icount_vm_timer = qemu_new_timer_ns(vm_clock, icount_adjust_vm, NULL);
384 qemu_mod_timer(icount_vm_timer,
385 qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
386 }
387
388 /***********************************************************/
389 void hw_error(const char *fmt, ...)
390 {
391 va_list ap;
392 CPUArchState *env;
393 CPUState *cpu;
394
395 va_start(ap, fmt);
396 fprintf(stderr, "qemu: hardware error: ");
397 vfprintf(stderr, fmt, ap);
398 fprintf(stderr, "\n");
399 for (env = first_cpu; env != NULL; env = env->next_cpu) {
400 cpu = ENV_GET_CPU(env);
401 fprintf(stderr, "CPU #%d:\n", cpu->cpu_index);
402 cpu_dump_state(env, stderr, fprintf, CPU_DUMP_FPU);
403 }
404 va_end(ap);
405 abort();
406 }
407
408 void cpu_synchronize_all_states(void)
409 {
410 CPUArchState *cpu;
411
412 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
413 cpu_synchronize_state(cpu);
414 }
415 }
416
417 void cpu_synchronize_all_post_reset(void)
418 {
419 CPUArchState *cpu;
420
421 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
422 cpu_synchronize_post_reset(ENV_GET_CPU(cpu));
423 }
424 }
425
426 void cpu_synchronize_all_post_init(void)
427 {
428 CPUArchState *cpu;
429
430 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
431 cpu_synchronize_post_init(ENV_GET_CPU(cpu));
432 }
433 }
434
435 bool cpu_is_stopped(CPUState *cpu)
436 {
437 return !runstate_is_running() || cpu->stopped;
438 }
439
440 static void do_vm_stop(RunState state)
441 {
442 if (runstate_is_running()) {
443 cpu_disable_ticks();
444 pause_all_vcpus();
445 runstate_set(state);
446 vm_state_notify(0, state);
447 bdrv_drain_all();
448 bdrv_flush_all();
449 monitor_protocol_event(QEVENT_STOP, NULL);
450 }
451 }
452
453 static bool cpu_can_run(CPUState *cpu)
454 {
455 if (cpu->stop) {
456 return false;
457 }
458 if (cpu->stopped || !runstate_is_running()) {
459 return false;
460 }
461 return true;
462 }
463
464 static void cpu_handle_guest_debug(CPUArchState *env)
465 {
466 CPUState *cpu = ENV_GET_CPU(env);
467
468 gdb_set_stop_cpu(env);
469 qemu_system_debug_request();
470 cpu->stopped = true;
471 }
472
473 static void cpu_signal(int sig)
474 {
475 if (cpu_single_env) {
476 cpu_exit(cpu_single_env);
477 }
478 exit_request = 1;
479 }
480
481 #ifdef CONFIG_LINUX
482 static void sigbus_reraise(void)
483 {
484 sigset_t set;
485 struct sigaction action;
486
487 memset(&action, 0, sizeof(action));
488 action.sa_handler = SIG_DFL;
489 if (!sigaction(SIGBUS, &action, NULL)) {
490 raise(SIGBUS);
491 sigemptyset(&set);
492 sigaddset(&set, SIGBUS);
493 sigprocmask(SIG_UNBLOCK, &set, NULL);
494 }
495 perror("Failed to re-raise SIGBUS!\n");
496 abort();
497 }
498
499 static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
500 void *ctx)
501 {
502 if (kvm_on_sigbus(siginfo->ssi_code,
503 (void *)(intptr_t)siginfo->ssi_addr)) {
504 sigbus_reraise();
505 }
506 }
507
508 static void qemu_init_sigbus(void)
509 {
510 struct sigaction action;
511
512 memset(&action, 0, sizeof(action));
513 action.sa_flags = SA_SIGINFO;
514 action.sa_sigaction = (void (*)(int, siginfo_t*, void*))sigbus_handler;
515 sigaction(SIGBUS, &action, NULL);
516
517 prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
518 }
519
520 static void qemu_kvm_eat_signals(CPUState *cpu)
521 {
522 struct timespec ts = { 0, 0 };
523 siginfo_t siginfo;
524 sigset_t waitset;
525 sigset_t chkset;
526 int r;
527
528 sigemptyset(&waitset);
529 sigaddset(&waitset, SIG_IPI);
530 sigaddset(&waitset, SIGBUS);
531
532 do {
533 r = sigtimedwait(&waitset, &siginfo, &ts);
534 if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
535 perror("sigtimedwait");
536 exit(1);
537 }
538
539 switch (r) {
540 case SIGBUS:
541 if (kvm_on_sigbus_vcpu(cpu, siginfo.si_code, siginfo.si_addr)) {
542 sigbus_reraise();
543 }
544 break;
545 default:
546 break;
547 }
548
549 r = sigpending(&chkset);
550 if (r == -1) {
551 perror("sigpending");
552 exit(1);
553 }
554 } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
555 }
556
557 #else /* !CONFIG_LINUX */
558
559 static void qemu_init_sigbus(void)
560 {
561 }
562
563 static void qemu_kvm_eat_signals(CPUState *cpu)
564 {
565 }
566 #endif /* !CONFIG_LINUX */
567
568 #ifndef _WIN32
569 static void dummy_signal(int sig)
570 {
571 }
572
573 static void qemu_kvm_init_cpu_signals(CPUArchState *env)
574 {
575 int r;
576 sigset_t set;
577 struct sigaction sigact;
578
579 memset(&sigact, 0, sizeof(sigact));
580 sigact.sa_handler = dummy_signal;
581 sigaction(SIG_IPI, &sigact, NULL);
582
583 pthread_sigmask(SIG_BLOCK, NULL, &set);
584 sigdelset(&set, SIG_IPI);
585 sigdelset(&set, SIGBUS);
586 r = kvm_set_signal_mask(env, &set);
587 if (r) {
588 fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
589 exit(1);
590 }
591 }
592
593 static void qemu_tcg_init_cpu_signals(void)
594 {
595 sigset_t set;
596 struct sigaction sigact;
597
598 memset(&sigact, 0, sizeof(sigact));
599 sigact.sa_handler = cpu_signal;
600 sigaction(SIG_IPI, &sigact, NULL);
601
602 sigemptyset(&set);
603 sigaddset(&set, SIG_IPI);
604 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
605 }
606
607 #else /* _WIN32 */
608 static void qemu_kvm_init_cpu_signals(CPUArchState *env)
609 {
610 abort();
611 }
612
613 static void qemu_tcg_init_cpu_signals(void)
614 {
615 }
616 #endif /* _WIN32 */
617
618 static QemuMutex qemu_global_mutex;
619 static QemuCond qemu_io_proceeded_cond;
620 static bool iothread_requesting_mutex;
621
622 static QemuThread io_thread;
623
624 static QemuThread *tcg_cpu_thread;
625 static QemuCond *tcg_halt_cond;
626
627 /* cpu creation */
628 static QemuCond qemu_cpu_cond;
629 /* system init */
630 static QemuCond qemu_pause_cond;
631 static QemuCond qemu_work_cond;
632
633 void qemu_init_cpu_loop(void)
634 {
635 qemu_init_sigbus();
636 qemu_cond_init(&qemu_cpu_cond);
637 qemu_cond_init(&qemu_pause_cond);
638 qemu_cond_init(&qemu_work_cond);
639 qemu_cond_init(&qemu_io_proceeded_cond);
640 qemu_mutex_init(&qemu_global_mutex);
641
642 qemu_thread_get_self(&io_thread);
643 }
644
645 void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
646 {
647 struct qemu_work_item wi;
648
649 if (qemu_cpu_is_self(cpu)) {
650 func(data);
651 return;
652 }
653
654 wi.func = func;
655 wi.data = data;
656 if (cpu->queued_work_first == NULL) {
657 cpu->queued_work_first = &wi;
658 } else {
659 cpu->queued_work_last->next = &wi;
660 }
661 cpu->queued_work_last = &wi;
662 wi.next = NULL;
663 wi.done = false;
664
665 qemu_cpu_kick(cpu);
666 while (!wi.done) {
667 CPUArchState *self_env = cpu_single_env;
668
669 qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
670 cpu_single_env = self_env;
671 }
672 }
673
674 static void flush_queued_work(CPUState *cpu)
675 {
676 struct qemu_work_item *wi;
677
678 if (cpu->queued_work_first == NULL) {
679 return;
680 }
681
682 while ((wi = cpu->queued_work_first)) {
683 cpu->queued_work_first = wi->next;
684 wi->func(wi->data);
685 wi->done = true;
686 }
687 cpu->queued_work_last = NULL;
688 qemu_cond_broadcast(&qemu_work_cond);
689 }
690
691 static void qemu_wait_io_event_common(CPUState *cpu)
692 {
693 if (cpu->stop) {
694 cpu->stop = false;
695 cpu->stopped = true;
696 qemu_cond_signal(&qemu_pause_cond);
697 }
698 flush_queued_work(cpu);
699 cpu->thread_kicked = false;
700 }
701
702 static void qemu_tcg_wait_io_event(void)
703 {
704 CPUArchState *env;
705
706 while (all_cpu_threads_idle()) {
707 /* Start accounting real time to the virtual clock if the CPUs
708 are idle. */
709 qemu_clock_warp(vm_clock);
710 qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
711 }
712
713 while (iothread_requesting_mutex) {
714 qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex);
715 }
716
717 for (env = first_cpu; env != NULL; env = env->next_cpu) {
718 qemu_wait_io_event_common(ENV_GET_CPU(env));
719 }
720 }
721
722 static void qemu_kvm_wait_io_event(CPUArchState *env)
723 {
724 CPUState *cpu = ENV_GET_CPU(env);
725
726 while (cpu_thread_is_idle(env)) {
727 qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
728 }
729
730 qemu_kvm_eat_signals(cpu);
731 qemu_wait_io_event_common(cpu);
732 }
733
734 static void *qemu_kvm_cpu_thread_fn(void *arg)
735 {
736 CPUArchState *env = arg;
737 CPUState *cpu = ENV_GET_CPU(env);
738 int r;
739
740 qemu_mutex_lock(&qemu_global_mutex);
741 qemu_thread_get_self(cpu->thread);
742 cpu->thread_id = qemu_get_thread_id();
743 cpu_single_env = env;
744
745 r = kvm_init_vcpu(cpu);
746 if (r < 0) {
747 fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
748 exit(1);
749 }
750
751 qemu_kvm_init_cpu_signals(env);
752
753 /* signal CPU creation */
754 cpu->created = true;
755 qemu_cond_signal(&qemu_cpu_cond);
756
757 while (1) {
758 if (cpu_can_run(cpu)) {
759 r = kvm_cpu_exec(env);
760 if (r == EXCP_DEBUG) {
761 cpu_handle_guest_debug(env);
762 }
763 }
764 qemu_kvm_wait_io_event(env);
765 }
766
767 return NULL;
768 }
769
770 static void *qemu_dummy_cpu_thread_fn(void *arg)
771 {
772 #ifdef _WIN32
773 fprintf(stderr, "qtest is not supported under Windows\n");
774 exit(1);
775 #else
776 CPUArchState *env = arg;
777 CPUState *cpu = ENV_GET_CPU(env);
778 sigset_t waitset;
779 int r;
780
781 qemu_mutex_lock_iothread();
782 qemu_thread_get_self(cpu->thread);
783 cpu->thread_id = qemu_get_thread_id();
784
785 sigemptyset(&waitset);
786 sigaddset(&waitset, SIG_IPI);
787
788 /* signal CPU creation */
789 cpu->created = true;
790 qemu_cond_signal(&qemu_cpu_cond);
791
792 cpu_single_env = env;
793 while (1) {
794 cpu_single_env = NULL;
795 qemu_mutex_unlock_iothread();
796 do {
797 int sig;
798 r = sigwait(&waitset, &sig);
799 } while (r == -1 && (errno == EAGAIN || errno == EINTR));
800 if (r == -1) {
801 perror("sigwait");
802 exit(1);
803 }
804 qemu_mutex_lock_iothread();
805 cpu_single_env = env;
806 qemu_wait_io_event_common(cpu);
807 }
808
809 return NULL;
810 #endif
811 }
812
813 static void tcg_exec_all(void);
814
815 static void *qemu_tcg_cpu_thread_fn(void *arg)
816 {
817 CPUState *cpu = arg;
818 CPUArchState *env;
819
820 qemu_tcg_init_cpu_signals();
821 qemu_thread_get_self(cpu->thread);
822
823 /* signal CPU creation */
824 qemu_mutex_lock(&qemu_global_mutex);
825 for (env = first_cpu; env != NULL; env = env->next_cpu) {
826 cpu = ENV_GET_CPU(env);
827 cpu->thread_id = qemu_get_thread_id();
828 cpu->created = true;
829 }
830 qemu_cond_signal(&qemu_cpu_cond);
831
832 /* wait for initial kick-off after machine start */
833 while (ENV_GET_CPU(first_cpu)->stopped) {
834 qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
835
836 /* process any pending work */
837 for (env = first_cpu; env != NULL; env = env->next_cpu) {
838 qemu_wait_io_event_common(ENV_GET_CPU(env));
839 }
840 }
841
842 while (1) {
843 tcg_exec_all();
844 if (use_icount && qemu_clock_deadline(vm_clock) <= 0) {
845 qemu_notify_event();
846 }
847 qemu_tcg_wait_io_event();
848 }
849
850 return NULL;
851 }
852
853 static void qemu_cpu_kick_thread(CPUState *cpu)
854 {
855 #ifndef _WIN32
856 int err;
857
858 err = pthread_kill(cpu->thread->thread, SIG_IPI);
859 if (err) {
860 fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
861 exit(1);
862 }
863 #else /* _WIN32 */
864 if (!qemu_cpu_is_self(cpu)) {
865 CONTEXT tcgContext;
866
867 if (SuspendThread(cpu->hThread) == (DWORD)-1) {
868 fprintf(stderr, "qemu:%s: GetLastError:%d\n", __func__,
869 GetLastError());
870 exit(1);
871 }
872
873 /* On multi-core systems, we are not sure that the thread is actually
874 * suspended until we can get the context.
875 */
876 tcgContext.ContextFlags = CONTEXT_CONTROL;
877 while (GetThreadContext(cpu->hThread, &tcgContext) != 0) {
878 continue;
879 }
880
881 cpu_signal(0);
882
883 if (ResumeThread(cpu->hThread) == (DWORD)-1) {
884 fprintf(stderr, "qemu:%s: GetLastError:%d\n", __func__,
885 GetLastError());
886 exit(1);
887 }
888 }
889 #endif
890 }
891
892 void qemu_cpu_kick(CPUState *cpu)
893 {
894 qemu_cond_broadcast(cpu->halt_cond);
895 if (!tcg_enabled() && !cpu->thread_kicked) {
896 qemu_cpu_kick_thread(cpu);
897 cpu->thread_kicked = true;
898 }
899 }
900
901 void qemu_cpu_kick_self(void)
902 {
903 #ifndef _WIN32
904 assert(cpu_single_env);
905 CPUState *cpu_single_cpu = ENV_GET_CPU(cpu_single_env);
906
907 if (!cpu_single_cpu->thread_kicked) {
908 qemu_cpu_kick_thread(cpu_single_cpu);
909 cpu_single_cpu->thread_kicked = true;
910 }
911 #else
912 abort();
913 #endif
914 }
915
916 bool qemu_cpu_is_self(CPUState *cpu)
917 {
918 return qemu_thread_is_self(cpu->thread);
919 }
920
921 static bool qemu_in_vcpu_thread(void)
922 {
923 return cpu_single_env && qemu_cpu_is_self(ENV_GET_CPU(cpu_single_env));
924 }
925
926 void qemu_mutex_lock_iothread(void)
927 {
928 if (!tcg_enabled()) {
929 qemu_mutex_lock(&qemu_global_mutex);
930 } else {
931 iothread_requesting_mutex = true;
932 if (qemu_mutex_trylock(&qemu_global_mutex)) {
933 qemu_cpu_kick_thread(ENV_GET_CPU(first_cpu));
934 qemu_mutex_lock(&qemu_global_mutex);
935 }
936 iothread_requesting_mutex = false;
937 qemu_cond_broadcast(&qemu_io_proceeded_cond);
938 }
939 }
940
941 void qemu_mutex_unlock_iothread(void)
942 {
943 qemu_mutex_unlock(&qemu_global_mutex);
944 }
945
946 static int all_vcpus_paused(void)
947 {
948 CPUArchState *penv = first_cpu;
949
950 while (penv) {
951 CPUState *pcpu = ENV_GET_CPU(penv);
952 if (!pcpu->stopped) {
953 return 0;
954 }
955 penv = penv->next_cpu;
956 }
957
958 return 1;
959 }
960
961 void pause_all_vcpus(void)
962 {
963 CPUArchState *penv = first_cpu;
964
965 qemu_clock_enable(vm_clock, false);
966 while (penv) {
967 CPUState *pcpu = ENV_GET_CPU(penv);
968 pcpu->stop = true;
969 qemu_cpu_kick(pcpu);
970 penv = penv->next_cpu;
971 }
972
973 if (qemu_in_vcpu_thread()) {
974 cpu_stop_current();
975 if (!kvm_enabled()) {
976 while (penv) {
977 CPUState *pcpu = ENV_GET_CPU(penv);
978 pcpu->stop = 0;
979 pcpu->stopped = true;
980 penv = penv->next_cpu;
981 }
982 return;
983 }
984 }
985
986 while (!all_vcpus_paused()) {
987 qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
988 penv = first_cpu;
989 while (penv) {
990 qemu_cpu_kick(ENV_GET_CPU(penv));
991 penv = penv->next_cpu;
992 }
993 }
994 }
995
996 void resume_all_vcpus(void)
997 {
998 CPUArchState *penv = first_cpu;
999
1000 qemu_clock_enable(vm_clock, true);
1001 while (penv) {
1002 CPUState *pcpu = ENV_GET_CPU(penv);
1003 pcpu->stop = false;
1004 pcpu->stopped = false;
1005 qemu_cpu_kick(pcpu);
1006 penv = penv->next_cpu;
1007 }
1008 }
1009
1010 static void qemu_tcg_init_vcpu(CPUState *cpu)
1011 {
1012 /* share a single thread for all cpus with TCG */
1013 if (!tcg_cpu_thread) {
1014 cpu->thread = g_malloc0(sizeof(QemuThread));
1015 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1016 qemu_cond_init(cpu->halt_cond);
1017 tcg_halt_cond = cpu->halt_cond;
1018 qemu_thread_create(cpu->thread, qemu_tcg_cpu_thread_fn, cpu,
1019 QEMU_THREAD_JOINABLE);
1020 #ifdef _WIN32
1021 cpu->hThread = qemu_thread_get_handle(cpu->thread);
1022 #endif
1023 while (!cpu->created) {
1024 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1025 }
1026 tcg_cpu_thread = cpu->thread;
1027 } else {
1028 cpu->thread = tcg_cpu_thread;
1029 cpu->halt_cond = tcg_halt_cond;
1030 }
1031 }
1032
1033 static void qemu_kvm_start_vcpu(CPUArchState *env)
1034 {
1035 CPUState *cpu = ENV_GET_CPU(env);
1036
1037 cpu->thread = g_malloc0(sizeof(QemuThread));
1038 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1039 qemu_cond_init(cpu->halt_cond);
1040 qemu_thread_create(cpu->thread, qemu_kvm_cpu_thread_fn, env,
1041 QEMU_THREAD_JOINABLE);
1042 while (!cpu->created) {
1043 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1044 }
1045 }
1046
1047 static void qemu_dummy_start_vcpu(CPUArchState *env)
1048 {
1049 CPUState *cpu = ENV_GET_CPU(env);
1050
1051 cpu->thread = g_malloc0(sizeof(QemuThread));
1052 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1053 qemu_cond_init(cpu->halt_cond);
1054 qemu_thread_create(cpu->thread, qemu_dummy_cpu_thread_fn, env,
1055 QEMU_THREAD_JOINABLE);
1056 while (!cpu->created) {
1057 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1058 }
1059 }
1060
1061 void qemu_init_vcpu(void *_env)
1062 {
1063 CPUArchState *env = _env;
1064 CPUState *cpu = ENV_GET_CPU(env);
1065
1066 cpu->nr_cores = smp_cores;
1067 cpu->nr_threads = smp_threads;
1068 cpu->stopped = true;
1069 if (kvm_enabled()) {
1070 qemu_kvm_start_vcpu(env);
1071 } else if (tcg_enabled()) {
1072 qemu_tcg_init_vcpu(cpu);
1073 } else {
1074 qemu_dummy_start_vcpu(env);
1075 }
1076 }
1077
1078 void cpu_stop_current(void)
1079 {
1080 if (cpu_single_env) {
1081 CPUState *cpu_single_cpu = ENV_GET_CPU(cpu_single_env);
1082 cpu_single_cpu->stop = false;
1083 cpu_single_cpu->stopped = true;
1084 cpu_exit(cpu_single_env);
1085 qemu_cond_signal(&qemu_pause_cond);
1086 }
1087 }
1088
1089 void vm_stop(RunState state)
1090 {
1091 if (qemu_in_vcpu_thread()) {
1092 qemu_system_vmstop_request(state);
1093 /*
1094 * FIXME: should not return to device code in case
1095 * vm_stop() has been requested.
1096 */
1097 cpu_stop_current();
1098 return;
1099 }
1100 do_vm_stop(state);
1101 }
1102
1103 /* does a state transition even if the VM is already stopped,
1104 current state is forgotten forever */
1105 void vm_stop_force_state(RunState state)
1106 {
1107 if (runstate_is_running()) {
1108 vm_stop(state);
1109 } else {
1110 runstate_set(state);
1111 }
1112 }
1113
1114 static int tcg_cpu_exec(CPUArchState *env)
1115 {
1116 int ret;
1117 #ifdef CONFIG_PROFILER
1118 int64_t ti;
1119 #endif
1120
1121 #ifdef CONFIG_PROFILER
1122 ti = profile_getclock();
1123 #endif
1124 if (use_icount) {
1125 int64_t count;
1126 int decr;
1127 qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
1128 env->icount_decr.u16.low = 0;
1129 env->icount_extra = 0;
1130 count = qemu_icount_round(qemu_clock_deadline(vm_clock));
1131 qemu_icount += count;
1132 decr = (count > 0xffff) ? 0xffff : count;
1133 count -= decr;
1134 env->icount_decr.u16.low = decr;
1135 env->icount_extra = count;
1136 }
1137 ret = cpu_exec(env);
1138 #ifdef CONFIG_PROFILER
1139 qemu_time += profile_getclock() - ti;
1140 #endif
1141 if (use_icount) {
1142 /* Fold pending instructions back into the
1143 instruction counter, and clear the interrupt flag. */
1144 qemu_icount -= (env->icount_decr.u16.low
1145 + env->icount_extra);
1146 env->icount_decr.u32 = 0;
1147 env->icount_extra = 0;
1148 }
1149 return ret;
1150 }
1151
1152 static void tcg_exec_all(void)
1153 {
1154 int r;
1155
1156 /* Account partial waits to the vm_clock. */
1157 qemu_clock_warp(vm_clock);
1158
1159 if (next_cpu == NULL) {
1160 next_cpu = first_cpu;
1161 }
1162 for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
1163 CPUArchState *env = next_cpu;
1164 CPUState *cpu = ENV_GET_CPU(env);
1165
1166 qemu_clock_enable(vm_clock,
1167 (env->singlestep_enabled & SSTEP_NOTIMER) == 0);
1168
1169 if (cpu_can_run(cpu)) {
1170 r = tcg_cpu_exec(env);
1171 if (r == EXCP_DEBUG) {
1172 cpu_handle_guest_debug(env);
1173 break;
1174 }
1175 } else if (cpu->stop || cpu->stopped) {
1176 break;
1177 }
1178 }
1179 exit_request = 0;
1180 }
1181
1182 void set_numa_modes(void)
1183 {
1184 CPUArchState *env;
1185 CPUState *cpu;
1186 int i;
1187
1188 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1189 cpu = ENV_GET_CPU(env);
1190 for (i = 0; i < nb_numa_nodes; i++) {
1191 if (test_bit(cpu->cpu_index, node_cpumask[i])) {
1192 cpu->numa_node = i;
1193 }
1194 }
1195 }
1196 }
1197
1198 void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
1199 {
1200 /* XXX: implement xxx_cpu_list for targets that still miss it */
1201 #if defined(cpu_list)
1202 cpu_list(f, cpu_fprintf);
1203 #endif
1204 }
1205
1206 CpuInfoList *qmp_query_cpus(Error **errp)
1207 {
1208 CpuInfoList *head = NULL, *cur_item = NULL;
1209 CPUArchState *env;
1210
1211 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1212 CPUState *cpu = ENV_GET_CPU(env);
1213 CpuInfoList *info;
1214
1215 cpu_synchronize_state(env);
1216
1217 info = g_malloc0(sizeof(*info));
1218 info->value = g_malloc0(sizeof(*info->value));
1219 info->value->CPU = cpu->cpu_index;
1220 info->value->current = (env == first_cpu);
1221 info->value->halted = cpu->halted;
1222 info->value->thread_id = cpu->thread_id;
1223 #if defined(TARGET_I386)
1224 info->value->has_pc = true;
1225 info->value->pc = env->eip + env->segs[R_CS].base;
1226 #elif defined(TARGET_PPC)
1227 info->value->has_nip = true;
1228 info->value->nip = env->nip;
1229 #elif defined(TARGET_SPARC)
1230 info->value->has_pc = true;
1231 info->value->pc = env->pc;
1232 info->value->has_npc = true;
1233 info->value->npc = env->npc;
1234 #elif defined(TARGET_MIPS)
1235 info->value->has_PC = true;
1236 info->value->PC = env->active_tc.PC;
1237 #endif
1238
1239 /* XXX: waiting for the qapi to support GSList */
1240 if (!cur_item) {
1241 head = cur_item = info;
1242 } else {
1243 cur_item->next = info;
1244 cur_item = info;
1245 }
1246 }
1247
1248 return head;
1249 }
1250
1251 void qmp_memsave(int64_t addr, int64_t size, const char *filename,
1252 bool has_cpu, int64_t cpu_index, Error **errp)
1253 {
1254 FILE *f;
1255 uint32_t l;
1256 CPUArchState *env;
1257 CPUState *cpu;
1258 uint8_t buf[1024];
1259
1260 if (!has_cpu) {
1261 cpu_index = 0;
1262 }
1263
1264 cpu = qemu_get_cpu(cpu_index);
1265 if (cpu == NULL) {
1266 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
1267 "a CPU number");
1268 return;
1269 }
1270 env = cpu->env_ptr;
1271
1272 f = fopen(filename, "wb");
1273 if (!f) {
1274 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
1275 return;
1276 }
1277
1278 while (size != 0) {
1279 l = sizeof(buf);
1280 if (l > size)
1281 l = size;
1282 cpu_memory_rw_debug(env, addr, buf, l, 0);
1283 if (fwrite(buf, 1, l, f) != l) {
1284 error_set(errp, QERR_IO_ERROR);
1285 goto exit;
1286 }
1287 addr += l;
1288 size -= l;
1289 }
1290
1291 exit:
1292 fclose(f);
1293 }
1294
1295 void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
1296 Error **errp)
1297 {
1298 FILE *f;
1299 uint32_t l;
1300 uint8_t buf[1024];
1301
1302 f = fopen(filename, "wb");
1303 if (!f) {
1304 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
1305 return;
1306 }
1307
1308 while (size != 0) {
1309 l = sizeof(buf);
1310 if (l > size)
1311 l = size;
1312 cpu_physical_memory_rw(addr, buf, l, 0);
1313 if (fwrite(buf, 1, l, f) != l) {
1314 error_set(errp, QERR_IO_ERROR);
1315 goto exit;
1316 }
1317 addr += l;
1318 size -= l;
1319 }
1320
1321 exit:
1322 fclose(f);
1323 }
1324
1325 void qmp_inject_nmi(Error **errp)
1326 {
1327 #if defined(TARGET_I386)
1328 CPUArchState *env;
1329
1330 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1331 if (!env->apic_state) {
1332 cpu_interrupt(CPU(x86_env_get_cpu(env)), CPU_INTERRUPT_NMI);
1333 } else {
1334 apic_deliver_nmi(env->apic_state);
1335 }
1336 }
1337 #else
1338 error_set(errp, QERR_UNSUPPORTED);
1339 #endif
1340 }