int cpu_is_stopped(CPUState *env)
{
- return !vm_running || env->stopped;
+ return !runstate_is_running() || env->stopped;
}
-static void do_vm_stop(int reason)
+static void do_vm_stop(RunState state)
{
- if (vm_running) {
+ if (runstate_is_running()) {
cpu_disable_ticks();
- vm_running = 0;
pause_all_vcpus();
- vm_state_notify(0, reason);
+ runstate_set(state);
+ vm_state_notify(0, state);
qemu_aio_flush();
bdrv_flush_all();
monitor_protocol_event(QEVENT_STOP, NULL);
if (env->stop) {
return 0;
}
- if (env->stopped || !vm_running) {
+ if (env->stopped || !runstate_is_running()) {
return 0;
}
return 1;
if (env->stop || env->queued_work_first) {
return false;
}
- if (env->stopped || !vm_running) {
+ if (env->stopped || !runstate_is_running()) {
return true;
}
if (!env->halted || qemu_cpu_has_work(env) ||
{
gdb_set_stop_cpu(env);
qemu_system_debug_request();
-#ifdef CONFIG_IOTHREAD
env->stopped = 1;
-#endif
}
-#ifdef CONFIG_IOTHREAD
static void cpu_signal(int sig)
{
if (cpu_single_env) {
}
exit_request = 1;
}
-#endif
#ifdef CONFIG_LINUX
static void sigbus_reraise(void)
exit(1);
}
} while (sigismember(&chkset, SIG_IPI) || sigismember(&chkset, SIGBUS));
-
-#ifndef CONFIG_IOTHREAD
- if (sigismember(&chkset, SIGIO) || sigismember(&chkset, SIGALRM)) {
- qemu_notify_event();
- }
-#endif
}
#else /* !CONFIG_LINUX */
int sigfd;
sigset_t set;
-#ifdef CONFIG_IOTHREAD
- /* SIGUSR2 used by posix-aio-compat.c */
+ /*
+ * SIG_IPI must be blocked in the main thread and must not be caught
+ * by sigwait() in the signal thread. Otherwise, the cpu thread will
+ * not catch it reliably.
+ */
sigemptyset(&set);
- sigaddset(&set, SIGUSR2);
- pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+ sigaddset(&set, SIG_IPI);
+ pthread_sigmask(SIG_BLOCK, &set, NULL);
sigemptyset(&set);
sigaddset(&set, SIGIO);
sigaddset(&set, SIGALRM);
- sigaddset(&set, SIG_IPI);
sigaddset(&set, SIGBUS);
pthread_sigmask(SIG_BLOCK, &set, NULL);
-#else
- sigemptyset(&set);
- sigaddset(&set, SIGBUS);
- if (kvm_enabled()) {
- /*
- * We need to process timer signals synchronously to avoid a race
- * between exit_request check and KVM vcpu entry.
- */
- sigaddset(&set, SIGIO);
- sigaddset(&set, SIGALRM);
- }
-#endif
sigfd = qemu_signalfd(&set);
if (sigfd == -1) {
sigact.sa_handler = dummy_signal;
sigaction(SIG_IPI, &sigact, NULL);
-#ifdef CONFIG_IOTHREAD
pthread_sigmask(SIG_BLOCK, NULL, &set);
sigdelset(&set, SIG_IPI);
sigdelset(&set, SIGBUS);
fprintf(stderr, "kvm_set_signal_mask: %s\n", strerror(-r));
exit(1);
}
-#else
- sigemptyset(&set);
- sigaddset(&set, SIG_IPI);
- sigaddset(&set, SIGIO);
- sigaddset(&set, SIGALRM);
- pthread_sigmask(SIG_BLOCK, &set, NULL);
- pthread_sigmask(SIG_BLOCK, NULL, &set);
- sigdelset(&set, SIGIO);
- sigdelset(&set, SIGALRM);
-#endif
sigdelset(&set, SIG_IPI);
sigdelset(&set, SIGBUS);
r = kvm_set_signal_mask(env, &set);
static void qemu_tcg_init_cpu_signals(void)
{
-#ifdef CONFIG_IOTHREAD
sigset_t set;
struct sigaction sigact;
sigemptyset(&set);
sigaddset(&set, SIG_IPI);
pthread_sigmask(SIG_UNBLOCK, &set, NULL);
-#endif
}
#else /* _WIN32 */
}
#endif /* _WIN32 */
-#ifndef CONFIG_IOTHREAD
-int qemu_init_main_loop(void)
-{
- int ret;
-
- ret = qemu_signal_init();
- if (ret) {
- return ret;
- }
-
- qemu_init_sigbus();
-
- return qemu_event_init();
-}
-
-void qemu_main_loop_start(void)
-{
-}
-
-void qemu_init_vcpu(void *_env)
-{
- CPUState *env = _env;
- int r;
-
- env->nr_cores = smp_cores;
- env->nr_threads = smp_threads;
-
- if (kvm_enabled()) {
- r = kvm_init_vcpu(env);
- if (r < 0) {
- fprintf(stderr, "kvm_init_vcpu failed: %s\n", strerror(-r));
- exit(1);
- }
- qemu_kvm_init_cpu_signals(env);
- } else {
- qemu_tcg_init_cpu_signals();
- }
-}
-
-int qemu_cpu_is_self(void *env)
-{
- return 1;
-}
-
-void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
-{
- func(data);
-}
-
-void resume_all_vcpus(void)
-{
-}
-
-void pause_all_vcpus(void)
-{
-}
-
-void qemu_cpu_kick(void *env)
-{
-}
-
-void qemu_cpu_kick_self(void)
-{
-#ifndef _WIN32
- assert(cpu_single_env);
-
- raise(SIG_IPI);
-#else
- abort();
-#endif
-}
-
-void qemu_notify_event(void)
-{
- CPUState *env = cpu_single_env;
-
- qemu_event_increment ();
- if (env) {
- cpu_exit(env);
- }
- if (next_cpu && env != next_cpu) {
- cpu_exit(next_cpu);
- }
- exit_request = 1;
-}
-
-void qemu_mutex_lock_iothread(void) {}
-void qemu_mutex_unlock_iothread(void) {}
-
-void cpu_stop_current(void)
-{
-}
-
-void vm_stop(int reason)
-{
- do_vm_stop(reason);
-}
-
-#else /* CONFIG_IOTHREAD */
-
QemuMutex qemu_global_mutex;
-static QemuMutex qemu_fair_mutex;
+static QemuCond qemu_io_proceeded_cond;
+static bool iothread_requesting_mutex;
static QemuThread io_thread;
static QemuThread *tcg_cpu_thread;
static QemuCond *tcg_halt_cond;
-static int qemu_system_ready;
/* cpu creation */
static QemuCond qemu_cpu_cond;
/* system init */
-static QemuCond qemu_system_cond;
static QemuCond qemu_pause_cond;
static QemuCond qemu_work_cond;
}
qemu_cond_init(&qemu_cpu_cond);
- qemu_cond_init(&qemu_system_cond);
qemu_cond_init(&qemu_pause_cond);
qemu_cond_init(&qemu_work_cond);
- qemu_mutex_init(&qemu_fair_mutex);
+ qemu_cond_init(&qemu_io_proceeded_cond);
qemu_mutex_init(&qemu_global_mutex);
qemu_mutex_lock(&qemu_global_mutex);
void qemu_main_loop_start(void)
{
- qemu_system_ready = 1;
- qemu_cond_broadcast(&qemu_system_cond);
+ resume_all_vcpus();
}
void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
}
- qemu_mutex_unlock(&qemu_global_mutex);
-
- /*
- * Users of qemu_global_mutex can be starved, having no chance
- * to acquire it since this path will get to it first.
- * So use another lock to provide fairness.
- */
- qemu_mutex_lock(&qemu_fair_mutex);
- qemu_mutex_unlock(&qemu_fair_mutex);
-
- qemu_mutex_lock(&qemu_global_mutex);
+ while (iothread_requesting_mutex) {
+ qemu_cond_wait(&qemu_io_proceeded_cond, &qemu_global_mutex);
+ }
for (env = first_cpu; env != NULL; env = env->next_cpu) {
qemu_wait_io_event_common(env);
env->created = 1;
qemu_cond_signal(&qemu_cpu_cond);
- /* and wait for machine initialization */
- while (!qemu_system_ready) {
- qemu_cond_wait(&qemu_system_cond, &qemu_global_mutex);
- }
-
while (1) {
if (cpu_can_run(env)) {
r = kvm_cpu_exec(env);
}
qemu_cond_signal(&qemu_cpu_cond);
- /* and wait for machine initialization */
- while (!qemu_system_ready) {
- qemu_cond_wait(&qemu_system_cond, &qemu_global_mutex);
+ /* wait for initial kick-off after machine start */
+ while (first_cpu->stopped) {
+ qemu_cond_wait(tcg_halt_cond, &qemu_global_mutex);
}
while (1) {
CPUState *env = _env;
qemu_cond_broadcast(env->halt_cond);
- if (!env->thread_kicked) {
+ if (kvm_enabled() && !env->thread_kicked) {
qemu_cpu_kick_thread(env);
env->thread_kicked = true;
}
if (kvm_enabled()) {
qemu_mutex_lock(&qemu_global_mutex);
} else {
- qemu_mutex_lock(&qemu_fair_mutex);
+ iothread_requesting_mutex = true;
if (qemu_mutex_trylock(&qemu_global_mutex)) {
qemu_cpu_kick_thread(first_cpu);
qemu_mutex_lock(&qemu_global_mutex);
}
- qemu_mutex_unlock(&qemu_fair_mutex);
+ iothread_requesting_mutex = false;
+ qemu_cond_broadcast(&qemu_io_proceeded_cond);
}
}
/* share a single thread for all cpus with TCG */
if (!tcg_cpu_thread) {
- env->thread = qemu_mallocz(sizeof(QemuThread));
- env->halt_cond = qemu_mallocz(sizeof(QemuCond));
+ env->thread = g_malloc0(sizeof(QemuThread));
+ env->halt_cond = g_malloc0(sizeof(QemuCond));
qemu_cond_init(env->halt_cond);
+ tcg_halt_cond = env->halt_cond;
qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env);
while (env->created == 0) {
qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
}
tcg_cpu_thread = env->thread;
- tcg_halt_cond = env->halt_cond;
} else {
env->thread = tcg_cpu_thread;
env->halt_cond = tcg_halt_cond;
static void qemu_kvm_start_vcpu(CPUState *env)
{
- env->thread = qemu_mallocz(sizeof(QemuThread));
- env->halt_cond = qemu_mallocz(sizeof(QemuCond));
+ env->thread = g_malloc0(sizeof(QemuThread));
+ env->halt_cond = g_malloc0(sizeof(QemuCond));
qemu_cond_init(env->halt_cond);
qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env);
while (env->created == 0) {
env->nr_cores = smp_cores;
env->nr_threads = smp_threads;
+ env->stopped = 1;
if (kvm_enabled()) {
qemu_kvm_start_vcpu(env);
} else {
}
}
-void vm_stop(int reason)
+void vm_stop(RunState state)
{
if (!qemu_thread_is_self(&io_thread)) {
- qemu_system_vmstop_request(reason);
+ qemu_system_vmstop_request(state);
/*
* FIXME: should not return to device code in case
* vm_stop() has been requested.
cpu_stop_current();
return;
}
- do_vm_stop(reason);
+ do_vm_stop(state);
}
-#endif
-
static int tcg_cpu_exec(CPUState *env)
{
int ret;
qemu_clock_enable(vm_clock,
(env->singlestep_enabled & SSTEP_NOTIMER) == 0);
-#ifndef CONFIG_IOTHREAD
- if (qemu_alarm_pending()) {
- break;
- }
-#endif
if (cpu_can_run(env)) {
if (kvm_enabled()) {
r = kvm_cpu_exec(env);
projects / qemu.git / blobdiff