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 #include <sys/prctl.h>
42 #define SIG_IPI (SIGRTMIN+4)
44 #define SIG_IPI SIGUSR1
48 #define PR_MCE_KILL 33
51 static CPUState
*next_cpu
;
53 /***********************************************************/
54 void hw_error(const char *fmt
, ...)
60 fprintf(stderr
, "qemu: hardware error: ");
61 vfprintf(stderr
, fmt
, ap
);
62 fprintf(stderr
, "\n");
63 for(env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
64 fprintf(stderr
, "CPU #%d:\n", env
->cpu_index
);
66 cpu_dump_state(env
, stderr
, fprintf
, X86_DUMP_FPU
);
68 cpu_dump_state(env
, stderr
, fprintf
, 0);
75 void cpu_synchronize_all_states(void)
79 for (cpu
= first_cpu
; cpu
; cpu
= cpu
->next_cpu
) {
80 cpu_synchronize_state(cpu
);
84 void cpu_synchronize_all_post_reset(void)
88 for (cpu
= first_cpu
; cpu
; cpu
= cpu
->next_cpu
) {
89 cpu_synchronize_post_reset(cpu
);
93 void cpu_synchronize_all_post_init(void)
97 for (cpu
= first_cpu
; cpu
; cpu
= cpu
->next_cpu
) {
98 cpu_synchronize_post_init(cpu
);
102 int cpu_is_stopped(CPUState
*env
)
104 return !vm_running
|| env
->stopped
;
107 static void do_vm_stop(int reason
)
113 vm_state_notify(0, reason
);
116 monitor_protocol_event(QEVENT_STOP
, NULL
);
120 static int cpu_can_run(CPUState
*env
)
124 if (env
->stopped
|| !vm_running
)
129 static int cpu_has_work(CPUState
*env
)
133 if (env
->queued_work_first
)
135 if (env
->stopped
|| !vm_running
)
139 if (qemu_cpu_has_work(env
))
144 static int any_cpu_has_work(void)
148 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
)
149 if (cpu_has_work(env
))
154 static void cpu_debug_handler(CPUState
*env
)
156 gdb_set_stop_cpu(env
);
157 debug_requested
= EXCP_DEBUG
;
162 static int io_thread_fd
= -1;
164 static void qemu_event_increment(void)
166 /* Write 8 bytes to be compatible with eventfd. */
167 static const uint64_t val
= 1;
170 if (io_thread_fd
== -1)
174 ret
= write(io_thread_fd
, &val
, sizeof(val
));
175 } while (ret
< 0 && errno
== EINTR
);
177 /* EAGAIN is fine, a read must be pending. */
178 if (ret
< 0 && errno
!= EAGAIN
) {
179 fprintf(stderr
, "qemu_event_increment: write() filed: %s\n",
185 static void qemu_event_read(void *opaque
)
187 int fd
= (unsigned long)opaque
;
191 /* Drain the notify pipe. For eventfd, only 8 bytes will be read. */
193 len
= read(fd
, buffer
, sizeof(buffer
));
194 } while ((len
== -1 && errno
== EINTR
) || len
== sizeof(buffer
));
197 static int qemu_event_init(void)
202 err
= qemu_eventfd(fds
);
206 err
= fcntl_setfl(fds
[0], O_NONBLOCK
);
210 err
= fcntl_setfl(fds
[1], O_NONBLOCK
);
214 qemu_set_fd_handler2(fds
[0], NULL
, qemu_event_read
, NULL
,
215 (void *)(unsigned long)fds
[0]);
217 io_thread_fd
= fds
[1];
226 HANDLE qemu_event_handle
;
228 static void dummy_event_handler(void *opaque
)
232 static int qemu_event_init(void)
234 qemu_event_handle
= CreateEvent(NULL
, FALSE
, FALSE
, NULL
);
235 if (!qemu_event_handle
) {
236 fprintf(stderr
, "Failed CreateEvent: %ld\n", GetLastError());
239 qemu_add_wait_object(qemu_event_handle
, dummy_event_handler
, NULL
);
243 static void qemu_event_increment(void)
245 if (!SetEvent(qemu_event_handle
)) {
246 fprintf(stderr
, "qemu_event_increment: SetEvent failed: %ld\n",
253 #ifndef CONFIG_IOTHREAD
254 int qemu_init_main_loop(void)
256 cpu_set_debug_excp_handler(cpu_debug_handler
);
258 return qemu_event_init();
261 void qemu_main_loop_start(void)
265 void qemu_init_vcpu(void *_env
)
267 CPUState
*env
= _env
;
269 env
->nr_cores
= smp_cores
;
270 env
->nr_threads
= smp_threads
;
276 int qemu_cpu_self(void *env
)
281 void run_on_cpu(CPUState
*env
, void (*func
)(void *data
), void *data
)
286 void resume_all_vcpus(void)
290 void pause_all_vcpus(void)
294 void qemu_cpu_kick(void *env
)
299 void qemu_notify_event(void)
301 CPUState
*env
= cpu_single_env
;
303 qemu_event_increment ();
307 if (next_cpu
&& env
!= next_cpu
) {
312 void qemu_mutex_lock_iothread(void) {}
313 void qemu_mutex_unlock_iothread(void) {}
315 void vm_stop(int reason
)
320 #else /* CONFIG_IOTHREAD */
322 #include "qemu-thread.h"
324 QemuMutex qemu_global_mutex
;
325 static QemuMutex qemu_fair_mutex
;
327 static QemuThread io_thread
;
329 static QemuThread
*tcg_cpu_thread
;
330 static QemuCond
*tcg_halt_cond
;
332 static int qemu_system_ready
;
334 static QemuCond qemu_cpu_cond
;
336 static QemuCond qemu_system_cond
;
337 static QemuCond qemu_pause_cond
;
338 static QemuCond qemu_work_cond
;
340 static void tcg_init_ipi(void);
341 static void kvm_init_ipi(CPUState
*env
);
342 static sigset_t
block_io_signals(void);
344 /* If we have signalfd, we mask out the signals we want to handle and then
345 * use signalfd to listen for them. We rely on whatever the current signal
346 * handler is to dispatch the signals when we receive them.
348 static void sigfd_handler(void *opaque
)
350 int fd
= (unsigned long) opaque
;
351 struct qemu_signalfd_siginfo info
;
352 struct sigaction action
;
357 len
= read(fd
, &info
, sizeof(info
));
358 } while (len
== -1 && errno
== EINTR
);
360 if (len
== -1 && errno
== EAGAIN
) {
364 if (len
!= sizeof(info
)) {
365 printf("read from sigfd returned %zd: %m\n", len
);
369 sigaction(info
.ssi_signo
, NULL
, &action
);
370 if ((action
.sa_flags
& SA_SIGINFO
) && action
.sa_sigaction
) {
371 action
.sa_sigaction(info
.ssi_signo
,
372 (siginfo_t
*)&info
, NULL
);
373 } else if (action
.sa_handler
) {
374 action
.sa_handler(info
.ssi_signo
);
379 static int qemu_signalfd_init(sigset_t mask
)
383 sigfd
= qemu_signalfd(&mask
);
385 fprintf(stderr
, "failed to create signalfd\n");
389 fcntl_setfl(sigfd
, O_NONBLOCK
);
391 qemu_set_fd_handler2(sigfd
, NULL
, sigfd_handler
, NULL
,
392 (void *)(unsigned long) sigfd
);
397 int qemu_init_main_loop(void)
400 sigset_t blocked_signals
;
402 cpu_set_debug_excp_handler(cpu_debug_handler
);
404 blocked_signals
= block_io_signals();
406 ret
= qemu_signalfd_init(blocked_signals
);
410 /* Note eventfd must be drained before signalfd handlers run */
411 ret
= qemu_event_init();
415 qemu_cond_init(&qemu_pause_cond
);
416 qemu_cond_init(&qemu_system_cond
);
417 qemu_mutex_init(&qemu_fair_mutex
);
418 qemu_mutex_init(&qemu_global_mutex
);
419 qemu_mutex_lock(&qemu_global_mutex
);
421 qemu_thread_self(&io_thread
);
426 void qemu_main_loop_start(void)
428 qemu_system_ready
= 1;
429 qemu_cond_broadcast(&qemu_system_cond
);
432 void run_on_cpu(CPUState
*env
, void (*func
)(void *data
), void *data
)
434 struct qemu_work_item wi
;
436 if (qemu_cpu_self(env
)) {
443 if (!env
->queued_work_first
)
444 env
->queued_work_first
= &wi
;
446 env
->queued_work_last
->next
= &wi
;
447 env
->queued_work_last
= &wi
;
453 CPUState
*self_env
= cpu_single_env
;
455 qemu_cond_wait(&qemu_work_cond
, &qemu_global_mutex
);
456 cpu_single_env
= self_env
;
460 static void flush_queued_work(CPUState
*env
)
462 struct qemu_work_item
*wi
;
464 if (!env
->queued_work_first
)
467 while ((wi
= env
->queued_work_first
)) {
468 env
->queued_work_first
= wi
->next
;
472 env
->queued_work_last
= NULL
;
473 qemu_cond_broadcast(&qemu_work_cond
);
476 static void qemu_wait_io_event_common(CPUState
*env
)
481 qemu_cond_signal(&qemu_pause_cond
);
483 flush_queued_work(env
);
484 env
->thread_kicked
= false;
487 static void qemu_tcg_wait_io_event(void)
491 while (!any_cpu_has_work())
492 qemu_cond_timedwait(tcg_halt_cond
, &qemu_global_mutex
, 1000);
494 qemu_mutex_unlock(&qemu_global_mutex
);
497 * Users of qemu_global_mutex can be starved, having no chance
498 * to acquire it since this path will get to it first.
499 * So use another lock to provide fairness.
501 qemu_mutex_lock(&qemu_fair_mutex
);
502 qemu_mutex_unlock(&qemu_fair_mutex
);
504 qemu_mutex_lock(&qemu_global_mutex
);
506 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
507 qemu_wait_io_event_common(env
);
511 static void sigbus_reraise(void)
514 struct sigaction action
;
516 memset(&action
, 0, sizeof(action
));
517 action
.sa_handler
= SIG_DFL
;
518 if (!sigaction(SIGBUS
, &action
, NULL
)) {
521 sigaddset(&set
, SIGBUS
);
522 sigprocmask(SIG_UNBLOCK
, &set
, NULL
);
524 perror("Failed to re-raise SIGBUS!\n");
528 static void sigbus_handler(int n
, struct qemu_signalfd_siginfo
*siginfo
,
531 #if defined(TARGET_I386)
532 if (kvm_on_sigbus(siginfo
->ssi_code
, (void *)(intptr_t)siginfo
->ssi_addr
))
537 static void qemu_kvm_eat_signal(CPUState
*env
, int timeout
)
545 ts
.tv_sec
= timeout
/ 1000;
546 ts
.tv_nsec
= (timeout
% 1000) * 1000000;
548 sigemptyset(&waitset
);
549 sigaddset(&waitset
, SIG_IPI
);
550 sigaddset(&waitset
, SIGBUS
);
553 qemu_mutex_unlock(&qemu_global_mutex
);
555 r
= sigtimedwait(&waitset
, &siginfo
, &ts
);
558 qemu_mutex_lock(&qemu_global_mutex
);
560 if (r
== -1 && !(e
== EAGAIN
|| e
== EINTR
)) {
561 fprintf(stderr
, "sigtimedwait: %s\n", strerror(e
));
568 if (kvm_on_sigbus_vcpu(env
, siginfo
.si_code
, siginfo
.si_addr
))
576 r
= sigpending(&chkset
);
578 fprintf(stderr
, "sigpending: %s\n", strerror(e
));
581 } while (sigismember(&chkset
, SIG_IPI
) || sigismember(&chkset
, SIGBUS
));
584 static void qemu_kvm_wait_io_event(CPUState
*env
)
586 while (!cpu_has_work(env
))
587 qemu_cond_timedwait(env
->halt_cond
, &qemu_global_mutex
, 1000);
589 qemu_kvm_eat_signal(env
, 0);
590 qemu_wait_io_event_common(env
);
593 static int qemu_cpu_exec(CPUState
*env
);
595 static void *kvm_cpu_thread_fn(void *arg
)
599 qemu_mutex_lock(&qemu_global_mutex
);
600 qemu_thread_self(env
->thread
);
606 /* signal CPU creation */
608 qemu_cond_signal(&qemu_cpu_cond
);
610 /* and wait for machine initialization */
611 while (!qemu_system_ready
)
612 qemu_cond_timedwait(&qemu_system_cond
, &qemu_global_mutex
, 100);
615 if (cpu_can_run(env
))
617 qemu_kvm_wait_io_event(env
);
623 static void *tcg_cpu_thread_fn(void *arg
)
628 qemu_thread_self(env
->thread
);
630 /* signal CPU creation */
631 qemu_mutex_lock(&qemu_global_mutex
);
632 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
)
634 qemu_cond_signal(&qemu_cpu_cond
);
636 /* and wait for machine initialization */
637 while (!qemu_system_ready
)
638 qemu_cond_timedwait(&qemu_system_cond
, &qemu_global_mutex
, 100);
642 qemu_tcg_wait_io_event();
648 void qemu_cpu_kick(void *_env
)
650 CPUState
*env
= _env
;
651 qemu_cond_broadcast(env
->halt_cond
);
652 if (!env
->thread_kicked
) {
653 qemu_thread_signal(env
->thread
, SIG_IPI
);
654 env
->thread_kicked
= true;
658 int qemu_cpu_self(void *_env
)
660 CPUState
*env
= _env
;
663 qemu_thread_self(&this);
665 return qemu_thread_equal(&this, env
->thread
);
668 static void cpu_signal(int sig
)
671 cpu_exit(cpu_single_env
);
675 static void tcg_init_ipi(void)
678 struct sigaction sigact
;
680 memset(&sigact
, 0, sizeof(sigact
));
681 sigact
.sa_handler
= cpu_signal
;
682 sigaction(SIG_IPI
, &sigact
, NULL
);
685 sigaddset(&set
, SIG_IPI
);
686 pthread_sigmask(SIG_UNBLOCK
, &set
, NULL
);
689 static void dummy_signal(int sig
)
693 static void kvm_init_ipi(CPUState
*env
)
697 struct sigaction sigact
;
699 memset(&sigact
, 0, sizeof(sigact
));
700 sigact
.sa_handler
= dummy_signal
;
701 sigaction(SIG_IPI
, &sigact
, NULL
);
703 pthread_sigmask(SIG_BLOCK
, NULL
, &set
);
704 sigdelset(&set
, SIG_IPI
);
705 sigdelset(&set
, SIGBUS
);
706 r
= kvm_set_signal_mask(env
, &set
);
708 fprintf(stderr
, "kvm_set_signal_mask: %s\n", strerror(r
));
713 static sigset_t
block_io_signals(void)
716 struct sigaction action
;
718 /* SIGUSR2 used by posix-aio-compat.c */
720 sigaddset(&set
, SIGUSR2
);
721 pthread_sigmask(SIG_UNBLOCK
, &set
, NULL
);
724 sigaddset(&set
, SIGIO
);
725 sigaddset(&set
, SIGALRM
);
726 sigaddset(&set
, SIG_IPI
);
727 sigaddset(&set
, SIGBUS
);
728 pthread_sigmask(SIG_BLOCK
, &set
, NULL
);
730 memset(&action
, 0, sizeof(action
));
731 action
.sa_flags
= SA_SIGINFO
;
732 action
.sa_sigaction
= (void (*)(int, siginfo_t
*, void*))sigbus_handler
;
733 sigaction(SIGBUS
, &action
, NULL
);
734 prctl(PR_MCE_KILL
, 1, 1, 0, 0);
739 void qemu_mutex_lock_iothread(void)
742 qemu_mutex_lock(&qemu_global_mutex
);
744 qemu_mutex_lock(&qemu_fair_mutex
);
745 if (qemu_mutex_trylock(&qemu_global_mutex
)) {
746 qemu_thread_signal(tcg_cpu_thread
, SIG_IPI
);
747 qemu_mutex_lock(&qemu_global_mutex
);
749 qemu_mutex_unlock(&qemu_fair_mutex
);
753 void qemu_mutex_unlock_iothread(void)
755 qemu_mutex_unlock(&qemu_global_mutex
);
758 static int all_vcpus_paused(void)
760 CPUState
*penv
= first_cpu
;
765 penv
= (CPUState
*)penv
->next_cpu
;
771 void pause_all_vcpus(void)
773 CPUState
*penv
= first_cpu
;
778 penv
= (CPUState
*)penv
->next_cpu
;
781 while (!all_vcpus_paused()) {
782 qemu_cond_timedwait(&qemu_pause_cond
, &qemu_global_mutex
, 100);
786 penv
= (CPUState
*)penv
->next_cpu
;
791 void resume_all_vcpus(void)
793 CPUState
*penv
= first_cpu
;
799 penv
= (CPUState
*)penv
->next_cpu
;
803 static void tcg_init_vcpu(void *_env
)
805 CPUState
*env
= _env
;
806 /* share a single thread for all cpus with TCG */
807 if (!tcg_cpu_thread
) {
808 env
->thread
= qemu_mallocz(sizeof(QemuThread
));
809 env
->halt_cond
= qemu_mallocz(sizeof(QemuCond
));
810 qemu_cond_init(env
->halt_cond
);
811 qemu_thread_create(env
->thread
, tcg_cpu_thread_fn
, env
);
812 while (env
->created
== 0)
813 qemu_cond_timedwait(&qemu_cpu_cond
, &qemu_global_mutex
, 100);
814 tcg_cpu_thread
= env
->thread
;
815 tcg_halt_cond
= env
->halt_cond
;
817 env
->thread
= tcg_cpu_thread
;
818 env
->halt_cond
= tcg_halt_cond
;
822 static void kvm_start_vcpu(CPUState
*env
)
824 env
->thread
= qemu_mallocz(sizeof(QemuThread
));
825 env
->halt_cond
= qemu_mallocz(sizeof(QemuCond
));
826 qemu_cond_init(env
->halt_cond
);
827 qemu_thread_create(env
->thread
, kvm_cpu_thread_fn
, env
);
828 while (env
->created
== 0)
829 qemu_cond_timedwait(&qemu_cpu_cond
, &qemu_global_mutex
, 100);
832 void qemu_init_vcpu(void *_env
)
834 CPUState
*env
= _env
;
836 env
->nr_cores
= smp_cores
;
837 env
->nr_threads
= smp_threads
;
844 void qemu_notify_event(void)
846 qemu_event_increment();
849 static void qemu_system_vmstop_request(int reason
)
851 vmstop_requested
= reason
;
855 void vm_stop(int reason
)
858 qemu_thread_self(&me
);
860 if (!qemu_thread_equal(&me
, &io_thread
)) {
861 qemu_system_vmstop_request(reason
);
863 * FIXME: should not return to device code in case
864 * vm_stop() has been requested.
866 if (cpu_single_env
) {
867 cpu_exit(cpu_single_env
);
868 cpu_single_env
->stop
= 1;
877 static int qemu_cpu_exec(CPUState
*env
)
880 #ifdef CONFIG_PROFILER
884 #ifdef CONFIG_PROFILER
885 ti
= profile_getclock();
890 qemu_icount
-= (env
->icount_decr
.u16
.low
+ env
->icount_extra
);
891 env
->icount_decr
.u16
.low
= 0;
892 env
->icount_extra
= 0;
893 count
= qemu_icount_round (qemu_next_deadline());
894 qemu_icount
+= count
;
895 decr
= (count
> 0xffff) ? 0xffff : count
;
897 env
->icount_decr
.u16
.low
= decr
;
898 env
->icount_extra
= count
;
901 #ifdef CONFIG_PROFILER
902 qemu_time
+= profile_getclock() - ti
;
905 /* Fold pending instructions back into the
906 instruction counter, and clear the interrupt flag. */
907 qemu_icount
-= (env
->icount_decr
.u16
.low
908 + env
->icount_extra
);
909 env
->icount_decr
.u32
= 0;
910 env
->icount_extra
= 0;
915 bool cpu_exec_all(void)
917 if (next_cpu
== NULL
)
918 next_cpu
= first_cpu
;
919 for (; next_cpu
!= NULL
&& !exit_request
; next_cpu
= next_cpu
->next_cpu
) {
920 CPUState
*env
= next_cpu
;
922 qemu_clock_enable(vm_clock
,
923 (env
->singlestep_enabled
& SSTEP_NOTIMER
) == 0);
925 if (qemu_alarm_pending())
927 if (cpu_can_run(env
)) {
928 if (qemu_cpu_exec(env
) == EXCP_DEBUG
) {
931 } else if (env
->stop
) {
936 return any_cpu_has_work();
939 void set_numa_modes(void)
944 for (env
= first_cpu
; env
!= NULL
; env
= env
->next_cpu
) {
945 for (i
= 0; i
< nb_numa_nodes
; i
++) {
946 if (node_cpumask
[i
] & (1 << env
->cpu_index
)) {
953 void set_cpu_log(const char *optarg
)
956 const CPULogItem
*item
;
958 mask
= cpu_str_to_log_mask(optarg
);
960 printf("Log items (comma separated):\n");
961 for (item
= cpu_log_items
; item
->mask
!= 0; item
++) {
962 printf("%-10s %s\n", item
->name
, item
->help
);
969 /* Return the virtual CPU time, based on the instruction counter. */
970 int64_t cpu_get_icount(void)
973 CPUState
*env
= cpu_single_env
;;
975 icount
= qemu_icount
;
977 if (!can_do_io(env
)) {
978 fprintf(stderr
, "Bad clock read\n");
980 icount
-= (env
->icount_decr
.u16
.low
+ env
->icount_extra
);
982 return qemu_icount_bias
+ (icount
<< icount_time_shift
);
985 void list_cpus(FILE *f
, fprintf_function cpu_fprintf
, const char *optarg
)
987 /* XXX: implement xxx_cpu_list for targets that still miss it */
988 #if defined(cpu_list_id)
989 cpu_list_id(f
, cpu_fprintf
, optarg
);
990 #elif defined(cpu_list)
991 cpu_list(f
, cpu_fprintf
); /* deprecated */