struct qemu_alarm_win32 {
MMRESULT timerId;
unsigned int period;
-} alarm_win32_data = {0, NULL, -1};
+} alarm_win32_data = {0, -1};
static int win32_start_timer(struct qemu_alarm_timer *t);
static void win32_stop_timer(struct qemu_alarm_timer *t);
qemu_get_clock(vm_clock))) ||
qemu_timer_expired(active_timers[QEMU_TIMER_REALTIME],
qemu_get_clock(rt_clock))) {
- CPUState *env = next_cpu;
-
qemu_event_increment();
alarm_timer->flags |= ALARM_FLAG_EXPIRED;
- if (env) {
+#ifndef CONFIG_IOTHREAD
+ if (next_cpu) {
/* stop the currently executing cpu because a timer occured */
- cpu_exit(env);
+ cpu_exit(next_cpu);
#ifdef CONFIG_KQEMU
- if (env->kqemu_enabled) {
- kqemu_cpu_interrupt(env);
+ if (next_cpu->kqemu_enabled) {
+ kqemu_cpu_interrupt(next_cpu);
}
#endif
}
+#endif
timer_alarm_pending = 1;
qemu_notify_event();
}
return 0;
}
-int check_params(char *buf, int buf_size,
- const char * const *params, const char *str)
+int check_params(const char * const *params, const char *str)
{
+ int name_buf_size = 1;
const char *p;
- int i;
+ char *name_buf;
+ int i, len;
+ int ret = 0;
+
+ for (i = 0; params[i] != NULL; i++) {
+ len = strlen(params[i]) + 1;
+ if (len > name_buf_size) {
+ name_buf_size = len;
+ }
+ }
+ name_buf = qemu_malloc(name_buf_size);
p = str;
while (*p != '\0') {
- p = get_opt_name(buf, buf_size, p, '=');
- if (*p != '=')
- return -1;
+ p = get_opt_name(name_buf, name_buf_size, p, '=');
+ if (*p != '=') {
+ ret = -1;
+ break;
+ }
p++;
for(i = 0; params[i] != NULL; i++)
- if (!strcmp(params[i], buf))
+ if (!strcmp(params[i], name_buf))
break;
- if (params[i] == NULL)
- return -1;
+ if (params[i] == NULL) {
+ ret = -1;
+ break;
+ }
p = get_opt_value(NULL, 0, p);
if (*p != ',')
break;
p++;
}
- return 0;
+
+ qemu_free(name_buf);
+ return ret;
}
/***********************************************************/
"cache", "format", "serial", "werror",
NULL };
- if (check_params(buf, sizeof(buf), params, str) < 0) {
+ if (check_params(params, str) < 0) {
fprintf(stderr, "qemu: unknown parameter '%s' in '%s'\n",
buf, str);
return -1;
}
}
+static void resume_all_vcpus(void);
+static void pause_all_vcpus(void);
+
void vm_start(void)
{
if (!vm_running) {
vm_running = 1;
vm_state_notify(1, 0);
qemu_rearm_alarm_timer(alarm_timer);
- }
-}
-
-void vm_stop(int reason)
-{
- if (vm_running) {
- cpu_disable_ticks();
- vm_running = 0;
- vm_state_notify(0, reason);
+ resume_all_vcpus();
}
}
static int shutdown_requested;
static int powerdown_requested;
static int debug_requested;
+static int vmstop_requested;
int qemu_shutdown_requested(void)
{
return r;
}
+static int qemu_vmstop_requested(void)
+{
+ int r = vmstop_requested;
+ vmstop_requested = 0;
+ return r;
+}
+
+static void do_vm_stop(int reason)
+{
+ if (vm_running) {
+ cpu_disable_ticks();
+ vm_running = 0;
+ pause_all_vcpus();
+ vm_state_notify(0, reason);
+ }
+}
+
void qemu_register_reset(QEMUResetHandler *func, void *opaque)
{
QEMUResetEntry **pre, *re;
qemu_notify_event();
}
-void qemu_notify_event(void)
+#ifdef CONFIG_IOTHREAD
+static void qemu_system_vmstop_request(int reason)
{
- CPUState *env = cpu_single_env;
-
- if (env) {
- cpu_exit(env);
-#ifdef USE_KQEMU
- if (env->kqemu_enabled)
- kqemu_cpu_interrupt(env);
-#endif
- }
+ vmstop_requested = reason;
+ qemu_notify_event();
}
+#endif
#ifndef _WIN32
static int io_thread_fd = -1;
(void *)(unsigned long)fds[0]);
io_thread_fd = fds[1];
+ return 0;
+
fail:
close(fds[0]);
close(fds[1]);
}
#endif
+static int cpu_can_run(CPUState *env)
+{
+ if (env->stop)
+ return 0;
+ if (env->stopped)
+ return 0;
+ return 1;
+}
+
+#ifndef CONFIG_IOTHREAD
static int qemu_init_main_loop(void)
{
return qemu_event_init();
return 1;
}
+static void resume_all_vcpus(void)
+{
+}
+
+static void pause_all_vcpus(void)
+{
+}
+
void qemu_cpu_kick(void *env)
{
return;
}
+void qemu_notify_event(void)
+{
+ CPUState *env = cpu_single_env;
+
+ if (env) {
+ cpu_exit(env);
+#ifdef USE_KQEMU
+ if (env->kqemu_enabled)
+ kqemu_cpu_interrupt(env);
+#endif
+ }
+}
+
#define qemu_mutex_lock_iothread() do { } while (0)
#define qemu_mutex_unlock_iothread() do { } while (0)
+void vm_stop(int reason)
+{
+ do_vm_stop(reason);
+}
+
+#else /* CONFIG_IOTHREAD */
+
+#include "qemu-thread.h"
+
+QemuMutex qemu_global_mutex;
+static QemuMutex qemu_fair_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 void block_io_signals(void);
+static void unblock_io_signals(void);
+static int tcg_has_work(void);
+
+static int qemu_init_main_loop(void)
+{
+ int ret;
+
+ ret = qemu_event_init();
+ if (ret)
+ return ret;
+
+ qemu_cond_init(&qemu_pause_cond);
+ qemu_mutex_init(&qemu_fair_mutex);
+ qemu_mutex_init(&qemu_global_mutex);
+ qemu_mutex_lock(&qemu_global_mutex);
+
+ unblock_io_signals();
+ qemu_thread_self(&io_thread);
+
+ return 0;
+}
+
+static void qemu_wait_io_event(CPUState *env)
+{
+ while (!tcg_has_work())
+ qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
+
+ 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);
+ if (env->stop) {
+ env->stop = 0;
+ env->stopped = 1;
+ qemu_cond_signal(&qemu_pause_cond);
+ }
+}
+
+static int qemu_cpu_exec(CPUState *env);
+
+static void *kvm_cpu_thread_fn(void *arg)
+{
+ CPUState *env = arg;
+
+ block_io_signals();
+ qemu_thread_self(env->thread);
+
+ /* signal CPU creation */
+ qemu_mutex_lock(&qemu_global_mutex);
+ env->created = 1;
+ qemu_cond_signal(&qemu_cpu_cond);
+
+ /* and wait for machine initialization */
+ while (!qemu_system_ready)
+ qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
+
+ while (1) {
+ if (cpu_can_run(env))
+ qemu_cpu_exec(env);
+ qemu_wait_io_event(env);
+ }
+
+ return NULL;
+}
+
+static void tcg_cpu_exec(void);
+
+static void *tcg_cpu_thread_fn(void *arg)
+{
+ CPUState *env = arg;
+
+ block_io_signals();
+ qemu_thread_self(env->thread);
+
+ /* signal CPU creation */
+ qemu_mutex_lock(&qemu_global_mutex);
+ for (env = first_cpu; env != NULL; env = env->next_cpu)
+ env->created = 1;
+ qemu_cond_signal(&qemu_cpu_cond);
+
+ /* and wait for machine initialization */
+ while (!qemu_system_ready)
+ qemu_cond_timedwait(&qemu_system_cond, &qemu_global_mutex, 100);
+
+ while (1) {
+ tcg_cpu_exec();
+ qemu_wait_io_event(cur_cpu);
+ }
+
+ return NULL;
+}
+
+void qemu_cpu_kick(void *_env)
+{
+ CPUState *env = _env;
+ qemu_cond_broadcast(env->halt_cond);
+ if (kvm_enabled())
+ qemu_thread_signal(env->thread, SIGUSR1);
+}
+
+int qemu_cpu_self(void *env)
+{
+ return (cpu_single_env != NULL);
+}
+
+static void cpu_signal(int sig)
+{
+ if (cpu_single_env)
+ cpu_exit(cpu_single_env);
+}
+
+static void block_io_signals(void)
+{
+ sigset_t set;
+ struct sigaction sigact;
+
+ sigemptyset(&set);
+ sigaddset(&set, SIGUSR2);
+ sigaddset(&set, SIGIO);
+ sigaddset(&set, SIGALRM);
+ pthread_sigmask(SIG_BLOCK, &set, NULL);
+
+ sigemptyset(&set);
+ sigaddset(&set, SIGUSR1);
+ pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+
+ memset(&sigact, 0, sizeof(sigact));
+ sigact.sa_handler = cpu_signal;
+ sigaction(SIGUSR1, &sigact, NULL);
+}
+
+static void unblock_io_signals(void)
+{
+ sigset_t set;
+
+ sigemptyset(&set);
+ sigaddset(&set, SIGUSR2);
+ sigaddset(&set, SIGIO);
+ sigaddset(&set, SIGALRM);
+ pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+
+ sigemptyset(&set);
+ sigaddset(&set, SIGUSR1);
+ pthread_sigmask(SIG_BLOCK, &set, NULL);
+}
+
+static void qemu_signal_lock(unsigned int msecs)
+{
+ qemu_mutex_lock(&qemu_fair_mutex);
+
+ while (qemu_mutex_trylock(&qemu_global_mutex)) {
+ qemu_thread_signal(tcg_cpu_thread, SIGUSR1);
+ if (!qemu_mutex_timedlock(&qemu_global_mutex, msecs))
+ break;
+ }
+ qemu_mutex_unlock(&qemu_fair_mutex);
+}
+
+static void qemu_mutex_lock_iothread(void)
+{
+ if (kvm_enabled()) {
+ qemu_mutex_lock(&qemu_fair_mutex);
+ qemu_mutex_lock(&qemu_global_mutex);
+ qemu_mutex_unlock(&qemu_fair_mutex);
+ } else
+ qemu_signal_lock(100);
+}
+
+static void qemu_mutex_unlock_iothread(void)
+{
+ qemu_mutex_unlock(&qemu_global_mutex);
+}
+
+static int all_vcpus_paused(void)
+{
+ CPUState *penv = first_cpu;
+
+ while (penv) {
+ if (!penv->stopped)
+ return 0;
+ penv = (CPUState *)penv->next_cpu;
+ }
+
+ return 1;
+}
+
+static void pause_all_vcpus(void)
+{
+ CPUState *penv = first_cpu;
+
+ while (penv) {
+ penv->stop = 1;
+ qemu_thread_signal(penv->thread, SIGUSR1);
+ qemu_cpu_kick(penv);
+ penv = (CPUState *)penv->next_cpu;
+ }
+
+ while (!all_vcpus_paused()) {
+ qemu_cond_timedwait(&qemu_pause_cond, &qemu_global_mutex, 100);
+ penv = first_cpu;
+ while (penv) {
+ qemu_thread_signal(penv->thread, SIGUSR1);
+ penv = (CPUState *)penv->next_cpu;
+ }
+ }
+}
+
+static void resume_all_vcpus(void)
+{
+ CPUState *penv = first_cpu;
+
+ while (penv) {
+ penv->stop = 0;
+ penv->stopped = 0;
+ qemu_thread_signal(penv->thread, SIGUSR1);
+ qemu_cpu_kick(penv);
+ penv = (CPUState *)penv->next_cpu;
+ }
+}
+
+static void tcg_init_vcpu(void *_env)
+{
+ CPUState *env = _env;
+ /* 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));
+ qemu_cond_init(env->halt_cond);
+ qemu_thread_create(env->thread, tcg_cpu_thread_fn, env);
+ while (env->created == 0)
+ qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
+ 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 kvm_start_vcpu(CPUState *env)
+{
+ kvm_init_vcpu(env);
+ env->thread = qemu_mallocz(sizeof(QemuThread));
+ env->halt_cond = qemu_mallocz(sizeof(QemuCond));
+ qemu_cond_init(env->halt_cond);
+ qemu_thread_create(env->thread, kvm_cpu_thread_fn, env);
+ while (env->created == 0)
+ qemu_cond_timedwait(&qemu_cpu_cond, &qemu_global_mutex, 100);
+}
+
+void qemu_init_vcpu(void *_env)
+{
+ CPUState *env = _env;
+
+ if (kvm_enabled())
+ kvm_start_vcpu(env);
+ else
+ tcg_init_vcpu(env);
+}
+
+void qemu_notify_event(void)
+{
+ qemu_event_increment();
+}
+
+void vm_stop(int reason)
+{
+ QemuThread me;
+ qemu_thread_self(&me);
+
+ if (!qemu_thread_equal(&me, &io_thread)) {
+ qemu_system_vmstop_request(reason);
+ /*
+ * FIXME: should not return to device code in case
+ * vm_stop() has been requested.
+ */
+ if (cpu_single_env) {
+ cpu_exit(cpu_single_env);
+ cpu_single_env->stop = 1;
+ }
+ return;
+ }
+ do_vm_stop(reason);
+}
+
+#endif
+
+
#ifdef _WIN32
static void host_main_loop_wait(int *timeout)
{
}
/* vm time timers */
- if (vm_running && likely(!(cur_cpu->singlestep_enabled & SSTEP_NOTIMER)))
- qemu_run_timers(&active_timers[QEMU_TIMER_VIRTUAL],
- qemu_get_clock(vm_clock));
+ if (vm_running) {
+ if (!cur_cpu || likely(!(cur_cpu->singlestep_enabled & SSTEP_NOTIMER)))
+ qemu_run_timers(&active_timers[QEMU_TIMER_VIRTUAL],
+ qemu_get_clock(vm_clock));
+ }
/* real time timers */
qemu_run_timers(&active_timers[QEMU_TIMER_REALTIME],
static void tcg_cpu_exec(void)
{
- int ret;
+ int ret = 0;
if (next_cpu == NULL)
next_cpu = first_cpu;
timer_alarm_pending = 0;
break;
}
- ret = qemu_cpu_exec(env);
+ if (cpu_can_run(env))
+ ret = qemu_cpu_exec(env);
if (ret == EXCP_DEBUG) {
gdb_set_stop_cpu(env);
debug_requested = 1;
static int cpu_has_work(CPUState *env)
{
+ if (env->stop)
+ return 1;
+ if (env->stopped)
+ return 0;
if (!env->halted)
return 1;
if (qemu_cpu_has_work(env))
static void main_loop(void)
{
- for (;;) {
+ int r;
+#ifdef CONFIG_IOTHREAD
+ qemu_system_ready = 1;
+ qemu_cond_broadcast(&qemu_system_cond);
+#endif
+
+ for (;;) {
do {
#ifdef CONFIG_PROFILER
int64_t ti;
#endif
+#ifndef CONFIG_IOTHREAD
tcg_cpu_exec();
+#endif
#ifdef CONFIG_PROFILER
ti = profile_getclock();
#endif
+#ifdef CONFIG_IOTHREAD
+ main_loop_wait(1000);
+#else
main_loop_wait(qemu_calculate_timeout());
+#endif
#ifdef CONFIG_PROFILER
dev_time += profile_getclock() - ti;
#endif
} else
break;
}
- if (qemu_reset_requested())
+ if (qemu_reset_requested()) {
+ pause_all_vcpus();
qemu_system_reset();
+ resume_all_vcpus();
+ }
if (qemu_powerdown_requested())
qemu_system_powerdown();
+ if ((r = qemu_vmstop_requested()))
+ vm_stop(r);
}
+ pause_all_vcpus();
}
static void version(void)
projects / qemu / blobdiff