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Fix qemu_wait_io_event processing in io-thread mode 

When checking for I/O events in the tcg CPU loop, make sure that we
call qemu_wait_io_event_common for all CPUs, not only the current one.
Otherwise pause_all_vcpus may lock up or run_on_cpu requests may starve.

Rename qemu_wait_io_event to qemu_tcg_wait_io_event at this chance and
purge its argument list as it has no use for it.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Jan Kiszka 2010-06-25 16:56:53 +02:00 committed by Aurelien Jarno
parent c629a4bc97
commit 6cabe1f303
1 changed files with 9 additions and 4 deletions
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13
cpus.c
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@ -403,10 +403,12 @@ static void qemu_wait_io_event_common(CPUState *env)
flush_queued_work(env);
}
static void qemu_wait_io_event(CPUState *env)
static void qemu_tcg_wait_io_event(void)
{
CPUState *env;
while (!tcg_has_work())
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
qemu_mutex_unlock(&qemu_global_mutex);
@ -419,7 +421,10 @@ static void qemu_wait_io_event(CPUState *env)
qemu_mutex_unlock(&qemu_fair_mutex);
qemu_mutex_lock(&qemu_global_mutex);
qemu_wait_io_event_common(env);
for (env = first_cpu; env != NULL; env = env->next_cpu) {
qemu_wait_io_event_common(env);
}
}
static void qemu_kvm_eat_signal(CPUState *env, int timeout)
@ -504,7 +509,7 @@ static void *tcg_cpu_thread_fn(void *arg)
while (1) {
tcg_cpu_exec();
qemu_wait_io_event(cur_cpu);
qemu_tcg_wait_io_event();
}
return NULL;