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
25 /* Needed early for CONFIG_BSD etc. */
26 #include "config-host.h"
38 #define SIG_IPI (SIGRTMIN+4)
40 #define SIG_IPI SIGUSR1
43 static CPUState *next_cpu;
45 /***********************************************************/
46 void hw_error(const char *fmt, ...)
52 fprintf(stderr, "qemu: hardware error: ");
53 vfprintf(stderr, fmt, ap);
54 fprintf(stderr, "\n");
55 for(env = first_cpu; env != NULL; env = env->next_cpu) {
56 fprintf(stderr, "CPU #%d:\n", env->cpu_index);
58 cpu_dump_state(env, stderr, fprintf, X86_DUMP_FPU);
60 cpu_dump_state(env, stderr, fprintf, 0);
67 void cpu_synchronize_all_states(void)
71 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
72 cpu_synchronize_state(cpu);
76 void cpu_synchronize_all_post_reset(void)
80 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
81 cpu_synchronize_post_reset(cpu);
85 void cpu_synchronize_all_post_init(void)
89 for (cpu = first_cpu; cpu; cpu = cpu->next_cpu) {
90 cpu_synchronize_post_init(cpu);
94 int cpu_is_stopped(CPUState *env)
96 return !vm_running || env->stopped;
99 static void do_vm_stop(int reason)
105 vm_state_notify(0, reason);
106 monitor_protocol_event(QEVENT_STOP, NULL);
110 static int cpu_can_run(CPUState *env)
114 if (env->stopped || !vm_running)
119 static int cpu_has_work(CPUState *env)
123 if (env->queued_work_first)
125 if (env->stopped || !vm_running)
129 if (qemu_cpu_has_work(env))
134 static int any_cpu_has_work(void)
138 for (env = first_cpu; env != NULL; env = env->next_cpu)
139 if (cpu_has_work(env))
144 static void cpu_debug_handler(CPUState *env)
146 gdb_set_stop_cpu(env);
147 debug_requested = EXCP_DEBUG;
152 static int io_thread_fd = -1;
154 static void qemu_event_increment(void)
156 /* Write 8 bytes to be compatible with eventfd. */
157 static const uint64_t val = 1;
160 if (io_thread_fd == -1)
164 ret = write(io_thread_fd, &val, sizeof(val));
165 } while (ret < 0 && errno == EINTR);
167 /* EAGAIN is fine, a read must be pending. */
168 if (ret < 0 && errno != EAGAIN) {
169 fprintf(stderr, "qemu_event_increment: write() filed: %s\n",
175 static void qemu_event_read(void *opaque)
177 int fd = (unsigned long)opaque;
181 /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */
183 len = read(fd, buffer, sizeof(buffer));
184 } while ((len == -1 && errno == EINTR) || len == sizeof(buffer));
187 static int qemu_event_init(void)
192 err = qemu_eventfd(fds);
196 err = fcntl_setfl(fds[0], O_NONBLOCK);
200 err = fcntl_setfl(fds[1], O_NONBLOCK);
204 qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL,
205 (void *)(unsigned long)fds[0]);
207 io_thread_fd = fds[1];
216 HANDLE qemu_event_handle;
218 static void dummy_event_handler(void *opaque)
222 static int qemu_event_init(void)
224 qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL);
225 if (!qemu_event_handle) {
226 fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
229 qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
233 static void qemu_event_increment(void)
235 if (!SetEvent(qemu_event_handle)) {
236 fprintf(stderr, "qemu_event_increment: SetEvent failed: %ld\n",
243 #ifndef CONFIG_IOTHREAD
244 int qemu_init_main_loop(void)
246 cpu_set_debug_excp_handler(cpu_debug_handler);
248 return qemu_event_init();
251 void qemu_main_loop_start(void)
255 void qemu_init_vcpu(void *_env)
257 CPUState *env = _env;
259 env->nr_cores = smp_cores;
260 env->nr_threads = smp_threads;
266 int qemu_cpu_self(void *env)
271 void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
276 void resume_all_vcpus(void)
280 void pause_all_vcpus(void)
284 void qemu_cpu_kick(void *env)
289 void qemu_notify_event(void)
291 CPUState *env = cpu_single_env;
293 qemu_event_increment ();
297 if (next_cpu && env != next_cpu) {
302 void qemu_mutex_lock_iothread(void) {}
303 void qemu_mutex_unlock_iothread(void) {}
305 void vm_stop(int reason)
310 #else /* CONFIG_IOTHREAD */
312 #include "qemu-thread.h"
314 QemuMutex qemu_global_mutex;
315 static QemuMutex qemu_fair_mutex;
317 static QemuThread io_thread;
319 static QemuThread *tcg_cpu_thread;
320 static QemuCond *tcg_halt_cond;
322 static int qemu_system_ready;
324 static QemuCond qemu_cpu_cond;
326 static QemuCond qemu_system_cond;
327 static QemuCond qemu_pause_cond;
328 static QemuCond qemu_work_cond;
330 static void tcg_init_ipi(void);
331 static void kvm_init_ipi(CPUState *env);
332 static void unblock_io_signals(void);
334 int qemu_init_main_loop(void)
338 cpu_set_debug_excp_handler(cpu_debug_handler);
340 ret = qemu_event_init();
344 qemu_cond_init(&qemu_pause_cond);
345 qemu_cond_init(&qemu_system_cond);
346 qemu_mutex_init(&qemu_fair_mutex);
347 qemu_mutex_init(&qemu_global_mutex);
348 qemu_mutex_lock(&qemu_global_mutex);
350 unblock_io_signals();
351 qemu_thread_self(&io_thread);
356 void qemu_main_loop_start(void)
358 qemu_system_ready = 1;
359 qemu_cond_broadcast(&qemu_system_cond);
362 void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
364 struct qemu_work_item wi;
366 if (qemu_cpu_self(env)) {
373 if (!env->queued_work_first)
374 env->queued_work_first = &wi;
376 env->queued_work_last->next = &wi;
377 env->queued_work_last = &wi;
383 CPUState *self_env = cpu_single_env;
385 qemu_cond_wait(&qemu_work_cond, &qemu_global_mutex);
386 cpu_single_env = self_env;
390 static void flush_queued_work(CPUState *env)
392 struct qemu_work_item *wi;
394 if (!env->queued_work_first)
397 while ((wi = env->queued_work_first)) {
398 env->queued_work_first = wi->next;
402 env->queued_work_last = NULL;
403 qemu_cond_broadcast(&qemu_work_cond);
406 static void qemu_wait_io_event_common(CPUState *env)
411 qemu_cond_signal(&qemu_pause_cond);
413 flush_queued_work(env);
416 static void qemu_tcg_wait_io_event(void)
420 while (!any_cpu_has_work())
421 qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
423 qemu_mutex_unlock(&qemu_global_mutex);
426 * Users of qemu_global_mutex can be starved, having no chance
427 * to acquire it since this path will get to it first.
428 * So use another lock to provide fairness.
430 qemu_mutex_lock(&qemu_fair_mutex);
431 qemu_mutex_unlock(&qemu_fair_mutex);
433 qemu_mutex_lock(&qemu_global_mutex);
435 for (env = first_cpu; env != NULL; env = env->next_cpu) {
436 qemu_wait_io_event_common(env);
440 static void qemu_kvm_eat_signal(CPUState *env, int timeout)
447 ts.tv_sec = timeout / 1000;
448 ts.tv_nsec = (timeout % 1000) * 1000000;
450 sigemptyset(&waitset);
451 sigaddset(&waitset, SIG_IPI);
453 qemu_mutex_unlock(&qemu_global_mutex);
454 r = sigtimedwait(&waitset, &siginfo, &ts);
456 qemu_mutex_lock(&qemu_global_mutex);
458 if (r == -1 && !(e == EAGAIN || e == EINTR)) {
459 fprintf(stderr, "sigtimedwait: %s\n", strerror(e));
464 static void qemu_kvm_wait_io_event(CPUState *env)
466 while (!cpu_has_work(env))
467 qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
469 qemu_kvm_eat_signal(env, 0);
470 qemu_wait_io_event_common(env);
473 static int qemu_cpu_exec(CPUState *env);
475 static void *kvm_cpu_thread_fn(void *arg)
479 qemu_mutex_lock(&qemu_global_mutex);
480 qemu_thread_self(env->thread);
486 /* signal CPU creation */
488 qemu_cond_signal(&qemu_cpu_cond);
490 /* and wait for machine initialization */
491 while (!qemu_system_ready)
492 qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
495 if (cpu_can_run(env))
497 qemu_kvm_wait_io_event(env);
503 static void *tcg_cpu_thread_fn(void *arg)
508 qemu_thread_self(env->thread);
510 /* signal CPU creation */
511 qemu_mutex_lock(&qemu_global_mutex);
512 for (env = first_cpu; env != NULL; env = env->next_cpu)
514 qemu_cond_signal(&qemu_cpu_cond);
516 /* and wait for machine initialization */
517 while (!qemu_system_ready)
518 qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
522 qemu_tcg_wait_io_event();
528 void qemu_cpu_kick(void *_env)
530 CPUState *env = _env;
531 qemu_cond_broadcast(env->halt_cond);
532 qemu_thread_signal(env->thread, SIG_IPI);
535 int qemu_cpu_self(void *_env)
537 CPUState *env = _env;
540 qemu_thread_self(&this);
542 return qemu_thread_equal(&this, env->thread);
545 static void cpu_signal(int sig)
548 cpu_exit(cpu_single_env);
552 static void tcg_init_ipi(void)
555 struct sigaction sigact;
557 memset(&sigact, 0, sizeof(sigact));
558 sigact.sa_handler = cpu_signal;
559 sigaction(SIG_IPI, &sigact, NULL);
562 sigaddset(&set, SIG_IPI);
563 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
566 static void dummy_signal(int sig)
570 static void kvm_init_ipi(CPUState *env)
574 struct sigaction sigact;
576 memset(&sigact, 0, sizeof(sigact));
577 sigact.sa_handler = dummy_signal;
578 sigaction(SIG_IPI, &sigact, NULL);
580 pthread_sigmask(SIG_BLOCK, NULL, &set);
581 sigdelset(&set, SIG_IPI);
582 r = kvm_set_signal_mask(env, &set);
584 fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(r));
589 static void unblock_io_signals(void)
594 sigaddset(&set, SIGUSR2);
595 sigaddset(&set, SIGIO);
596 sigaddset(&set, SIGALRM);
597 pthread_sigmask(SIG_UNBLOCK, &set, NULL);
600 sigaddset(&set, SIG_IPI);
601 pthread_sigmask(SIG_BLOCK, &set, NULL);
604 void qemu_mutex_lock_iothread(void)
607 qemu_mutex_lock(&qemu_fair_mutex);
608 qemu_mutex_lock(&qemu_global_mutex);
609 qemu_mutex_unlock(&qemu_fair_mutex);
611 qemu_mutex_lock(&qemu_fair_mutex);
612 if (qemu_mutex_trylock(&qemu_global_mutex)) {
613 qemu_thread_signal(tcg_cpu_thread, SIG_IPI);
614 qemu_mutex_lock(&qemu_global_mutex);
616 qemu_mutex_unlock(&qemu_fair_mutex);
620 void qemu_mutex_unlock_iothread(void)
622 qemu_mutex_unlock(&qemu_global_mutex);
625 static int all_vcpus_paused(void)
627 CPUState *penv = first_cpu;
632 penv = (CPUState *)penv->next_cpu;
638 void pause_all_vcpus(void)
640 CPUState *penv = first_cpu;
645 penv = (CPUState *)penv->next_cpu;
648 while (!all_vcpus_paused()) {
649 qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
653 penv = (CPUState *)penv->next_cpu;
658 void resume_all_vcpus(void)
660 CPUState *penv = first_cpu;
666 penv = (CPUState *)penv->next_cpu;
670 static void tcg_init_vcpu(void *_env)
672 CPUState *env = _env;
673 /* share a single thread for all cpus with TCG */
674 if (!tcg_cpu_thread) {
675 env->thread = qemu_mallocz(sizeof(QemuThread));
676 env->halt_cond = qemu_mallocz(sizeof(QemuCond));
677 qemu_cond_init(env->halt_cond);
678 qemu_thread_create(env->thread, tcg_cpu_thread_fn, env);
679 while (env->created == 0)
680 qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
681 tcg_cpu_thread = env->thread;
682 tcg_halt_cond = env->halt_cond;
684 env->thread = tcg_cpu_thread;
685 env->halt_cond = tcg_halt_cond;
689 static void kvm_start_vcpu(CPUState *env)
691 env->thread = qemu_mallocz(sizeof(QemuThread));
692 env->halt_cond = qemu_mallocz(sizeof(QemuCond));
693 qemu_cond_init(env->halt_cond);
694 qemu_thread_create(env->thread, kvm_cpu_thread_fn, env);
695 while (env->created == 0)
696 qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
699 void qemu_init_vcpu(void *_env)
701 CPUState *env = _env;
703 env->nr_cores = smp_cores;
704 env->nr_threads = smp_threads;
711 void qemu_notify_event(void)
713 qemu_event_increment();
716 static void qemu_system_vmstop_request(int reason)
718 vmstop_requested = reason;
722 void vm_stop(int reason)
725 qemu_thread_self(&me);
727 if (!qemu_thread_equal(&me, &io_thread)) {
728 qemu_system_vmstop_request(reason);
730 * FIXME: should not return to device code in case
731 * vm_stop() has been requested.
733 if (cpu_single_env) {
734 cpu_exit(cpu_single_env);
735 cpu_single_env->stop = 1;
744 static int qemu_cpu_exec(CPUState *env)
747 #ifdef CONFIG_PROFILER
751 #ifdef CONFIG_PROFILER
752 ti = profile_getclock();
757 qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
758 env->icount_decr.u16.low = 0;
759 env->icount_extra = 0;
760 count = qemu_icount_round (qemu_next_deadline());
761 qemu_icount += count;
762 decr = (count > 0xffff) ? 0xffff : count;
764 env->icount_decr.u16.low = decr;
765 env->icount_extra = count;
768 #ifdef CONFIG_PROFILER
769 qemu_time += profile_getclock() - ti;
772 /* Fold pending instructions back into the
773 instruction counter, and clear the interrupt flag. */
774 qemu_icount -= (env->icount_decr.u16.low
775 + env->icount_extra);
776 env->icount_decr.u32 = 0;
777 env->icount_extra = 0;
782 bool cpu_exec_all(void)
784 if (next_cpu == NULL)
785 next_cpu = first_cpu;
786 for (; next_cpu != NULL && !exit_request; next_cpu = next_cpu->next_cpu) {
787 CPUState *env = next_cpu;
789 qemu_clock_enable(vm_clock,
790 (env->singlestep_enabled & SSTEP_NOTIMER) == 0);
792 if (qemu_alarm_pending())
794 if (cpu_can_run(env)) {
795 if (qemu_cpu_exec(env) == EXCP_DEBUG) {
798 } else if (env->stop) {
803 return any_cpu_has_work();
806 void set_numa_modes(void)
811 for (env = first_cpu; env != NULL; env = env->next_cpu) {
812 for (i = 0; i < nb_numa_nodes; i++) {
813 if (node_cpumask[i] & (1 << env->cpu_index)) {
820 void set_cpu_log(const char *optarg)
823 const CPULogItem *item;
825 mask = cpu_str_to_log_mask(optarg);
827 printf("Log items (comma separated):\n");
828 for (item = cpu_log_items; item->mask != 0; item++) {
829 printf("%-10s %s\n", item->name, item->help);
836 /* Return the virtual CPU time, based on the instruction counter. */
837 int64_t cpu_get_icount(void)
840 CPUState *env = cpu_single_env;;
842 icount = qemu_icount;
844 if (!can_do_io(env)) {
845 fprintf(stderr, "Bad clock read\n");
847 icount -= (env->icount_decr.u16.low + env->icount_extra);
849 return qemu_icount_bias + (icount << icount_time_shift);
852 void list_cpus(FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...),
855 /* XXX: implement xxx_cpu_list for targets that still miss it */
856 #if defined(cpu_list_id)
857 cpu_list_id(f, cpu_fprintf, optarg);
858 #elif defined(cpu_list)
859 cpu_list(f, cpu_fprintf); /* deprecated */