tap: properly initialize vhostfds
[qemu/ar7.git] / cpus.c
blobc232265cd25245fae1983ed4e1c775709fc66908
1 /*
2 * QEMU System Emulator
4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
25 /* Needed early for CONFIG_BSD etc. */
26 #include "config-host.h"
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"
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"
41 #ifndef _WIN32
42 #include "qemu/compatfd.h"
43 #endif
45 #ifdef CONFIG_LINUX
47 #include <sys/prctl.h>
49 #ifndef PR_MCE_KILL
50 #define PR_MCE_KILL 33
51 #endif
53 #ifndef PR_MCE_KILL_SET
54 #define PR_MCE_KILL_SET 1
55 #endif
57 #ifndef PR_MCE_KILL_EARLY
58 #define PR_MCE_KILL_EARLY 1
59 #endif
61 #endif /* CONFIG_LINUX */
63 static CPUArchState *next_cpu;
65 static bool cpu_thread_is_idle(CPUArchState *env)
67 CPUState *cpu = ENV_GET_CPU(env);
69 if (cpu->stop || cpu->queued_work_first) {
70 return false;
72 if (cpu->stopped || !runstate_is_running()) {
73 return true;
75 if (!cpu->halted || qemu_cpu_has_work(cpu) ||
76 kvm_async_interrupts_enabled()) {
77 return false;
79 return true;
82 static bool all_cpu_threads_idle(void)
84 CPUArchState *env;
86 for (env = first_cpu; env != NULL; env = env->next_cpu) {
87 if (!cpu_thread_is_idle(env)) {
88 return false;
91 return true;
94 /***********************************************************/
95 /* guest cycle counter */
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;
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;
117 TimersState timers_state;
119 /* Return the virtual CPU time, based on the instruction counter. */
120 int64_t cpu_get_icount(void)
122 int64_t icount;
123 CPUArchState *env = cpu_single_env;
125 icount = qemu_icount;
126 if (env) {
127 if (!can_do_io(env)) {
128 fprintf(stderr, "Bad clock read\n");
130 icount -= (env->icount_decr.u16.low + env->icount_extra);
132 return qemu_icount_bias + (icount << icount_time_shift);
135 /* return the host CPU cycle counter and handle stop/restart */
136 int64_t cpu_get_ticks(void)
138 if (use_icount) {
139 return cpu_get_icount();
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;
151 timers_state.cpu_ticks_prev = ticks;
152 return ticks + timers_state.cpu_ticks_offset;
156 /* return the host CPU monotonic timer and handle stop/restart */
157 int64_t cpu_get_clock(void)
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;
168 /* enable cpu_get_ticks() */
169 void cpu_enable_ticks(void)
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;
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)
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;
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)
195 static void icount_adjust(void)
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;
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--;
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++;
221 last_delta = delta;
222 qemu_icount_bias = cur_icount - (qemu_icount << icount_time_shift);
225 static void icount_adjust_rt(void *opaque)
227 qemu_mod_timer(icount_rt_timer,
228 qemu_get_clock_ms(rt_clock) + 1000);
229 icount_adjust();
232 static void icount_adjust_vm(void *opaque)
234 qemu_mod_timer(icount_vm_timer,
235 qemu_get_clock_ns(vm_clock) + get_ticks_per_sec() / 10);
236 icount_adjust();
239 static int64_t qemu_icount_round(int64_t count)
241 return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
244 static void icount_warp_rt(void *opaque)
246 if (vm_clock_warp_start == -1) {
247 return;
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 {
257 * In adaptive mode, do not let the vm_clock run too
258 * far ahead of real time.
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);
265 if (qemu_clock_expired(vm_clock)) {
266 qemu_notify_event();
269 vm_clock_warp_start = -1;
272 void qtest_clock_warp(int64_t dest)
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);
283 qemu_notify_event();
286 void qemu_clock_warp(QEMUClock *clock)
288 int64_t deadline;
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.
295 if (clock != vm_clock || !use_icount) {
296 return;
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.
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;
312 if (qtest_enabled()) {
313 /* When testing, qtest commands advance icount. */
314 return;
317 vm_clock_warp_start = qemu_get_clock_ns(rt_clock);
318 deadline = qemu_clock_deadline(vm_clock);
319 if (deadline > 0) {
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.
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.
336 qemu_mod_timer(icount_warp_timer, vm_clock_warp_start + deadline);
337 } else {
338 qemu_notify_event();
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()
355 void configure_icount(const char *option)
357 vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
358 if (!option) {
359 return;
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;
369 use_icount = 2;
371 /* 125MIPS seems a reasonable initial guess at the guest speed.
372 It will be corrected fairly quickly anyway. */
373 icount_time_shift = 3;
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);
388 /***********************************************************/
389 void hw_error(const char *fmt, ...)
391 va_list ap;
392 CPUArchState *env;
393 CPUState *cpu;
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);
404 va_end(ap);
405 abort();
408 void cpu_synchronize_all_states(void)
410 CPUArchState *cpu;
412 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
413 cpu_synchronize_state(cpu);
417 void cpu_synchronize_all_post_reset(void)
419 CPUArchState *cpu;
421 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
422 cpu_synchronize_post_reset(ENV_GET_CPU(cpu));
426 void cpu_synchronize_all_post_init(void)
428 CPUArchState *cpu;
430 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
431 cpu_synchronize_post_init(ENV_GET_CPU(cpu));
435 bool cpu_is_stopped(CPUState *cpu)
437 return !runstate_is_running() || cpu->stopped;
440 static void do_vm_stop(RunState state)
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);
453 static bool cpu_can_run(CPUState *cpu)
455 if (cpu->stop) {
456 return false;
458 if (cpu->stopped || !runstate_is_running()) {
459 return false;
461 return true;
464 static void cpu_handle_guest_debug(CPUArchState *env)
466 CPUState *cpu = ENV_GET_CPU(env);
468 gdb_set_stop_cpu(env);
469 qemu_system_debug_request();
470 cpu->stopped = true;
473 static void cpu_signal(int sig)
475 if (cpu_single_env) {
476 cpu_exit(cpu_single_env);
478 exit_request = 1;
481 #ifdef CONFIG_LINUX
482 static void sigbus_reraise(void)
484 sigset_t set;
485 struct sigaction action;
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);
495 perror("Failed to re-raise SIGBUS!\n");
496 abort();
499 static void sigbus_handler(int n, struct qemu_signalfd_siginfo *siginfo,
500 void *ctx)
502 if (kvm_on_sigbus(siginfo->ssi_code,
503 (void *)(intptr_t)siginfo->ssi_addr)) {
504 sigbus_reraise();
508 static void qemu_init_sigbus(void)
510 struct sigaction action;
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);
517 prctl(PR_MCE_KILL, PR_MCE_KILL_SET, PR_MCE_KILL_EARLY, 0, 0);
520 static void qemu_kvm_eat_signals(CPUState *cpu)
522 struct timespec ts = { 0, 0 };
523 siginfo_t siginfo;
524 sigset_t waitset;
525 sigset_t chkset;
526 int r;
528 sigemptyset(&waitset);
529 sigaddset(&waitset, SIG_IPI);
530 sigaddset(&waitset, SIGBUS);
532 do {
533 r = sigtimedwait(&waitset, &siginfo, &ts);
534 if (r == -1 && !(errno == EAGAIN || errno == EINTR)) {
535 perror("sigtimedwait");
536 exit(1);
539 switch (r) {
540 case SIGBUS:
541 if (kvm_on_sigbus_vcpu(cpu, siginfo.si_code, siginfo.si_addr)) {
542 sigbus_reraise();
544 break;
545 default:
546 break;
549 r = sigpending(&chkset);
550 if (r == -1) {
551 perror("sigpending");
552 exit(1);
554 } while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
557 #else /* !CONFIG_LINUX */
559 static void qemu_init_sigbus(void)
563 static void qemu_kvm_eat_signals(CPUState *cpu)
566 #endif /* !CONFIG_LINUX */
568 #ifndef _WIN32
569 static void dummy_signal(int sig)
573 static void qemu_kvm_init_cpu_signals(CPUArchState *env)
575 int r;
576 sigset_t set;
577 struct sigaction sigact;
579 memset(&sigact, 0, sizeof(sigact));
580 sigact.sa_handler = dummy_signal;
581 sigaction(SIG_IPI, &sigact, NULL);
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);
593 static void qemu_tcg_init_cpu_signals(void)
595 sigset_t set;
596 struct sigaction sigact;
598 memset(&sigact, 0, sizeof(sigact));
599 sigact.sa_handler = cpu_signal;
600 sigaction(SIG_IPI, &sigact, NULL);
602 sigemptyset(&set);
603 sigaddset(&set, SIG_IPI);
604 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
607 #else /* _WIN32 */
608 static void qemu_kvm_init_cpu_signals(CPUArchState *env)
610 abort();
613 static void qemu_tcg_init_cpu_signals(void)
616 #endif /* _WIN32 */
618 static QemuMutex qemu_global_mutex;
619 static QemuCond qemu_io_proceeded_cond;
620 static bool iothread_requesting_mutex;
622 static QemuThread io_thread;
624 static QemuThread *tcg_cpu_thread;
625 static QemuCond *tcg_halt_cond;
627 /* cpu creation */
628 static QemuCond qemu_cpu_cond;
629 /* system init */
630 static QemuCond qemu_pause_cond;
631 static QemuCond qemu_work_cond;
633 void qemu_init_cpu_loop(void)
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);
642 qemu_thread_get_self(&io_thread);
645 void run_on_cpu(CPUState *cpu, void (*func)(void *data), void *data)
647 struct qemu_work_item wi;
649 if (qemu_cpu_is_self(cpu)) {
650 func(data);
651 return;
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;
661 cpu->queued_work_last = &wi;
662 wi.next = NULL;
663 wi.done = false;
665 qemu_cpu_kick(cpu);
666 while (!wi.done) {
667 CPUArchState *self_env = cpu_single_env;
669 qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
670 cpu_single_env = self_env;
674 static void flush_queued_work(CPUState *cpu)
676 struct qemu_work_item *wi;
678 if (cpu->queued_work_first == NULL) {
679 return;
682 while ((wi = cpu->queued_work_first)) {
683 cpu->queued_work_first = wi->next;
684 wi->func(wi->data);
685 wi->done = true;
687 cpu->queued_work_last = NULL;
688 qemu_cond_broadcast(&qemu_work_cond);
691 static void qemu_wait_io_event_common(CPUState *cpu)
693 if (cpu->stop) {
694 cpu->stop = false;
695 cpu->stopped = true;
696 qemu_cond_signal(&qemu_pause_cond);
698 flush_queued_work(cpu);
699 cpu->thread_kicked = false;
702 static void qemu_tcg_wait_io_event(void)
704 CPUArchState *env;
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);
713 while (iothread_requesting_mutex) {
714 qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex);
717 for (env = first_cpu; env != NULL; env = env->next_cpu) {
718 qemu_wait_io_event_common(ENV_GET_CPU(env));
722 static void qemu_kvm_wait_io_event(CPUArchState *env)
724 CPUState *cpu = ENV_GET_CPU(env);
726 while (cpu_thread_is_idle(env)) {
727 qemu_cond_wait(cpu->halt_cond, &qemu_global_mutex);
730 qemu_kvm_eat_signals(cpu);
731 qemu_wait_io_event_common(cpu);
734 static void *qemu_kvm_cpu_thread_fn(void *arg)
736 CPUArchState *env = arg;
737 CPUState *cpu = ENV_GET_CPU(env);
738 int r;
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;
745 r = kvm_init_vcpu(cpu);
746 if (r < 0) {
747 fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
748 exit(1);
751 qemu_kvm_init_cpu_signals(env);
753 /* signal CPU creation */
754 cpu->created = true;
755 qemu_cond_signal(&qemu_cpu_cond);
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);
764 qemu_kvm_wait_io_event(env);
767 return NULL;
770 static void *qemu_dummy_cpu_thread_fn(void *arg)
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;
781 qemu_mutex_lock_iothread();
782 qemu_thread_get_self(cpu->thread);
783 cpu->thread_id = qemu_get_thread_id();
785 sigemptyset(&waitset);
786 sigaddset(&waitset, SIG_IPI);
788 /* signal CPU creation */
789 cpu->created = true;
790 qemu_cond_signal(&qemu_cpu_cond);
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);
804 qemu_mutex_lock_iothread();
805 cpu_single_env = env;
806 qemu_wait_io_event_common(cpu);
809 return NULL;
810 #endif
813 static void tcg_exec_all(void);
815 static void tcg_signal_cpu_creation(CPUState *cpu, void *data)
817 cpu->thread_id = qemu_get_thread_id();
818 cpu->created = true;
821 static void *qemu_tcg_cpu_thread_fn(void *arg)
823 CPUState *cpu = arg;
824 CPUArchState *env;
826 qemu_tcg_init_cpu_signals();
827 qemu_thread_get_self(cpu->thread);
829 qemu_mutex_lock(&qemu_global_mutex);
830 qemu_for_each_cpu(tcg_signal_cpu_creation, NULL);
831 qemu_cond_signal(&qemu_cpu_cond);
833 /* wait for initial kick-off after machine start */
834 while (ENV_GET_CPU(first_cpu)->stopped) {
835 qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
837 /* process any pending work */
838 for (env = first_cpu; env != NULL; env = env->next_cpu) {
839 qemu_wait_io_event_common(ENV_GET_CPU(env));
843 while (1) {
844 tcg_exec_all();
845 if (use_icount && qemu_clock_deadline(vm_clock) <= 0) {
846 qemu_notify_event();
848 qemu_tcg_wait_io_event();
851 return NULL;
854 static void qemu_cpu_kick_thread(CPUState *cpu)
856 #ifndef _WIN32
857 int err;
859 err = pthread_kill(cpu->thread->thread, SIG_IPI);
860 if (err) {
861 fprintf(stderr, "qemu:%s: %s", __func__, strerror(err));
862 exit(1);
864 #else /* _WIN32 */
865 if (!qemu_cpu_is_self(cpu)) {
866 CONTEXT tcgContext;
868 if (SuspendThread(cpu->hThread) == (DWORD)-1) {
869 fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
870 GetLastError());
871 exit(1);
874 /* On multi-core systems, we are not sure that the thread is actually
875 * suspended until we can get the context.
877 tcgContext.ContextFlags = CONTEXT_CONTROL;
878 while (GetThreadContext(cpu->hThread, &tcgContext) != 0) {
879 continue;
882 cpu_signal(0);
884 if (ResumeThread(cpu->hThread) == (DWORD)-1) {
885 fprintf(stderr, "qemu:%s: GetLastError:%lu\n", __func__,
886 GetLastError());
887 exit(1);
890 #endif
893 void qemu_cpu_kick(CPUState *cpu)
895 qemu_cond_broadcast(cpu->halt_cond);
896 if (!tcg_enabled() && !cpu->thread_kicked) {
897 qemu_cpu_kick_thread(cpu);
898 cpu->thread_kicked = true;
902 void qemu_cpu_kick_self(void)
904 #ifndef _WIN32
905 assert(cpu_single_env);
906 CPUState *cpu_single_cpu = ENV_GET_CPU(cpu_single_env);
908 if (!cpu_single_cpu->thread_kicked) {
909 qemu_cpu_kick_thread(cpu_single_cpu);
910 cpu_single_cpu->thread_kicked = true;
912 #else
913 abort();
914 #endif
917 bool qemu_cpu_is_self(CPUState *cpu)
919 return qemu_thread_is_self(cpu->thread);
922 static bool qemu_in_vcpu_thread(void)
924 return cpu_single_env && qemu_cpu_is_self(ENV_GET_CPU(cpu_single_env));
927 void qemu_mutex_lock_iothread(void)
929 if (!tcg_enabled()) {
930 qemu_mutex_lock(&qemu_global_mutex);
931 } else {
932 iothread_requesting_mutex = true;
933 if (qemu_mutex_trylock(&qemu_global_mutex)) {
934 qemu_cpu_kick_thread(ENV_GET_CPU(first_cpu));
935 qemu_mutex_lock(&qemu_global_mutex);
937 iothread_requesting_mutex = false;
938 qemu_cond_broadcast(&qemu_io_proceeded_cond);
942 void qemu_mutex_unlock_iothread(void)
944 qemu_mutex_unlock(&qemu_global_mutex);
947 static int all_vcpus_paused(void)
949 CPUArchState *penv = first_cpu;
951 while (penv) {
952 CPUState *pcpu = ENV_GET_CPU(penv);
953 if (!pcpu->stopped) {
954 return 0;
956 penv = penv->next_cpu;
959 return 1;
962 void pause_all_vcpus(void)
964 CPUArchState *penv = first_cpu;
966 qemu_clock_enable(vm_clock, false);
967 while (penv) {
968 CPUState *pcpu = ENV_GET_CPU(penv);
969 pcpu->stop = true;
970 qemu_cpu_kick(pcpu);
971 penv = penv->next_cpu;
974 if (qemu_in_vcpu_thread()) {
975 cpu_stop_current();
976 if (!kvm_enabled()) {
977 penv = first_cpu;
978 while (penv) {
979 CPUState *pcpu = ENV_GET_CPU(penv);
980 pcpu->stop = false;
981 pcpu->stopped = true;
982 penv = penv->next_cpu;
984 return;
988 while (!all_vcpus_paused()) {
989 qemu_cond_wait(&qemu_pause_cond, &qemu_global_mutex);
990 penv = first_cpu;
991 while (penv) {
992 qemu_cpu_kick(ENV_GET_CPU(penv));
993 penv = penv->next_cpu;
998 void cpu_resume(CPUState *cpu)
1000 cpu->stop = false;
1001 cpu->stopped = false;
1002 qemu_cpu_kick(cpu);
1005 void resume_all_vcpus(void)
1007 CPUArchState *penv = first_cpu;
1009 qemu_clock_enable(vm_clock, true);
1010 while (penv) {
1011 CPUState *pcpu = ENV_GET_CPU(penv);
1012 cpu_resume(pcpu);
1013 penv = penv->next_cpu;
1017 static void qemu_tcg_init_vcpu(CPUState *cpu)
1019 /* share a single thread for all cpus with TCG */
1020 if (!tcg_cpu_thread) {
1021 cpu->thread = g_malloc0(sizeof(QemuThread));
1022 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1023 qemu_cond_init(cpu->halt_cond);
1024 tcg_halt_cond = cpu->halt_cond;
1025 qemu_thread_create(cpu->thread, qemu_tcg_cpu_thread_fn, cpu,
1026 QEMU_THREAD_JOINABLE);
1027 #ifdef _WIN32
1028 cpu->hThread = qemu_thread_get_handle(cpu->thread);
1029 #endif
1030 while (!cpu->created) {
1031 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1033 tcg_cpu_thread = cpu->thread;
1034 } else {
1035 cpu->thread = tcg_cpu_thread;
1036 cpu->halt_cond = tcg_halt_cond;
1040 static void qemu_kvm_start_vcpu(CPUArchState *env)
1042 CPUState *cpu = ENV_GET_CPU(env);
1044 cpu->thread = g_malloc0(sizeof(QemuThread));
1045 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1046 qemu_cond_init(cpu->halt_cond);
1047 qemu_thread_create(cpu->thread, qemu_kvm_cpu_thread_fn, env,
1048 QEMU_THREAD_JOINABLE);
1049 while (!cpu->created) {
1050 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1054 static void qemu_dummy_start_vcpu(CPUArchState *env)
1056 CPUState *cpu = ENV_GET_CPU(env);
1058 cpu->thread = g_malloc0(sizeof(QemuThread));
1059 cpu->halt_cond = g_malloc0(sizeof(QemuCond));
1060 qemu_cond_init(cpu->halt_cond);
1061 qemu_thread_create(cpu->thread, qemu_dummy_cpu_thread_fn, env,
1062 QEMU_THREAD_JOINABLE);
1063 while (!cpu->created) {
1064 qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
1068 void qemu_init_vcpu(void *_env)
1070 CPUArchState *env = _env;
1071 CPUState *cpu = ENV_GET_CPU(env);
1073 cpu->nr_cores = smp_cores;
1074 cpu->nr_threads = smp_threads;
1075 cpu->stopped = true;
1076 if (kvm_enabled()) {
1077 qemu_kvm_start_vcpu(env);
1078 } else if (tcg_enabled()) {
1079 qemu_tcg_init_vcpu(cpu);
1080 } else {
1081 qemu_dummy_start_vcpu(env);
1085 void cpu_stop_current(void)
1087 if (cpu_single_env) {
1088 CPUState *cpu_single_cpu = ENV_GET_CPU(cpu_single_env);
1089 cpu_single_cpu->stop = false;
1090 cpu_single_cpu->stopped = true;
1091 cpu_exit(cpu_single_env);
1092 qemu_cond_signal(&qemu_pause_cond);
1096 void vm_stop(RunState state)
1098 if (qemu_in_vcpu_thread()) {
1099 qemu_system_vmstop_request(state);
1101 * FIXME: should not return to device code in case
1102 * vm_stop() has been requested.
1104 cpu_stop_current();
1105 return;
1107 do_vm_stop(state);
1110 /* does a state transition even if the VM is already stopped,
1111 current state is forgotten forever */
1112 void vm_stop_force_state(RunState state)
1114 if (runstate_is_running()) {
1115 vm_stop(state);
1116 } else {
1117 runstate_set(state);
1121 static int tcg_cpu_exec(CPUArchState *env)
1123 int ret;
1124 #ifdef CONFIG_PROFILER
1125 int64_t ti;
1126 #endif
1128 #ifdef CONFIG_PROFILER
1129 ti = profile_getclock();
1130 #endif
1131 if (use_icount) {
1132 int64_t count;
1133 int decr;
1134 qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
1135 env->icount_decr.u16.low = 0;
1136 env->icount_extra = 0;
1137 count = qemu_icount_round(qemu_clock_deadline(vm_clock));
1138 qemu_icount += count;
1139 decr = (count > 0xffff) ? 0xffff : count;
1140 count -= decr;
1141 env->icount_decr.u16.low = decr;
1142 env->icount_extra = count;
1144 ret = cpu_exec(env);
1145 #ifdef CONFIG_PROFILER
1146 qemu_time += profile_getclock() - ti;
1147 #endif
1148 if (use_icount) {
1149 /* Fold pending instructions back into the
1150 instruction counter, and clear the interrupt flag. */
1151 qemu_icount -= (env->icount_decr.u16.low
1152 + env->icount_extra);
1153 env->icount_decr.u32 = 0;
1154 env->icount_extra = 0;
1156 return ret;
1159 static void tcg_exec_all(void)
1161 int r;
1163 /* Account partial waits to the vm_clock. */
1164 qemu_clock_warp(vm_clock);
1166 if (next_cpu == NULL) {
1167 next_cpu = first_cpu;
1169 for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
1170 CPUArchState *env = next_cpu;
1171 CPUState *cpu = ENV_GET_CPU(env);
1173 qemu_clock_enable(vm_clock,
1174 (env->singlestep_enabled & SSTEP_NOTIMER) == 0);
1176 if (cpu_can_run(cpu)) {
1177 r = tcg_cpu_exec(env);
1178 if (r == EXCP_DEBUG) {
1179 cpu_handle_guest_debug(env);
1180 break;
1182 } else if (cpu->stop || cpu->stopped) {
1183 break;
1186 exit_request = 0;
1189 void set_numa_modes(void)
1191 CPUArchState *env;
1192 CPUState *cpu;
1193 int i;
1195 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1196 cpu = ENV_GET_CPU(env);
1197 for (i = 0; i < nb_numa_nodes; i++) {
1198 if (test_bit(cpu->cpu_index, node_cpumask[i])) {
1199 cpu->numa_node = i;
1205 void list_cpus(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
1207 /* XXX: implement xxx_cpu_list for targets that still miss it */
1208 #if defined(cpu_list)
1209 cpu_list(f, cpu_fprintf);
1210 #endif
1213 CpuInfoList *qmp_query_cpus(Error **errp)
1215 CpuInfoList *head = NULL, *cur_item = NULL;
1216 CPUArchState *env;
1218 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1219 CPUState *cpu = ENV_GET_CPU(env);
1220 CpuInfoList *info;
1222 cpu_synchronize_state(env);
1224 info = g_malloc0(sizeof(*info));
1225 info->value = g_malloc0(sizeof(*info->value));
1226 info->value->CPU = cpu->cpu_index;
1227 info->value->current = (env == first_cpu);
1228 info->value->halted = cpu->halted;
1229 info->value->thread_id = cpu->thread_id;
1230 #if defined(TARGET_I386)
1231 info->value->has_pc = true;
1232 info->value->pc = env->eip + env->segs[R_CS].base;
1233 #elif defined(TARGET_PPC)
1234 info->value->has_nip = true;
1235 info->value->nip = env->nip;
1236 #elif defined(TARGET_SPARC)
1237 info->value->has_pc = true;
1238 info->value->pc = env->pc;
1239 info->value->has_npc = true;
1240 info->value->npc = env->npc;
1241 #elif defined(TARGET_MIPS)
1242 info->value->has_PC = true;
1243 info->value->PC = env->active_tc.PC;
1244 #endif
1246 /* XXX: waiting for the qapi to support GSList */
1247 if (!cur_item) {
1248 head = cur_item = info;
1249 } else {
1250 cur_item->next = info;
1251 cur_item = info;
1255 return head;
1258 void qmp_memsave(int64_t addr, int64_t size, const char *filename,
1259 bool has_cpu, int64_t cpu_index, Error **errp)
1261 FILE *f;
1262 uint32_t l;
1263 CPUArchState *env;
1264 CPUState *cpu;
1265 uint8_t buf[1024];
1267 if (!has_cpu) {
1268 cpu_index = 0;
1271 cpu = qemu_get_cpu(cpu_index);
1272 if (cpu == NULL) {
1273 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "cpu-index",
1274 "a CPU number");
1275 return;
1277 env = cpu->env_ptr;
1279 f = fopen(filename, "wb");
1280 if (!f) {
1281 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
1282 return;
1285 while (size != 0) {
1286 l = sizeof(buf);
1287 if (l > size)
1288 l = size;
1289 cpu_memory_rw_debug(env, addr, buf, l, 0);
1290 if (fwrite(buf, 1, l, f) != l) {
1291 error_set(errp, QERR_IO_ERROR);
1292 goto exit;
1294 addr += l;
1295 size -= l;
1298 exit:
1299 fclose(f);
1302 void qmp_pmemsave(int64_t addr, int64_t size, const char *filename,
1303 Error **errp)
1305 FILE *f;
1306 uint32_t l;
1307 uint8_t buf[1024];
1309 f = fopen(filename, "wb");
1310 if (!f) {
1311 error_set(errp, QERR_OPEN_FILE_FAILED, filename);
1312 return;
1315 while (size != 0) {
1316 l = sizeof(buf);
1317 if (l > size)
1318 l = size;
1319 cpu_physical_memory_rw(addr, buf, l, 0);
1320 if (fwrite(buf, 1, l, f) != l) {
1321 error_set(errp, QERR_IO_ERROR);
1322 goto exit;
1324 addr += l;
1325 size -= l;
1328 exit:
1329 fclose(f);
1332 void qmp_inject_nmi(Error **errp)
1334 #if defined(TARGET_I386)
1335 CPUArchState *env;
1337 for (env = first_cpu; env != NULL; env = env->next_cpu) {
1338 if (!env->apic_state) {
1339 cpu_interrupt(CPU(x86_env_get_cpu(env)), CPU_INTERRUPT_NMI);
1340 } else {
1341 apic_deliver_nmi(env->apic_state);
1344 #else
1345 error_set(errp, QERR_UNSUPPORTED);
1346 #endif