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>
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parent
c629a4bc97
commit
6cabe1f303
11
cpus.c
11
cpus.c
@ -403,10 +403,12 @@ static void qemu_wait_io_event_common(CPUState *env)
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flush_queued_work(env);
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}
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static void qemu_wait_io_event(CPUState *env)
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static void qemu_tcg_wait_io_event(void)
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{
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CPUState *env;
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while (!tcg_has_work())
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qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
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qemu_cond_timedwait(tcg_halt_cond, &qemu_global_mutex, 1000);
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qemu_mutex_unlock(&qemu_global_mutex);
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@ -419,7 +421,10 @@ static void qemu_wait_io_event(CPUState *env)
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qemu_mutex_unlock(&qemu_fair_mutex);
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qemu_mutex_lock(&qemu_global_mutex);
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for (env = first_cpu; env != NULL; env = env->next_cpu) {
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qemu_wait_io_event_common(env);
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}
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}
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static void qemu_kvm_eat_signal(CPUState *env, int timeout)
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@ -504,7 +509,7 @@ static void *tcg_cpu_thread_fn(void *arg)
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while (1) {
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tcg_cpu_exec();
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qemu_wait_io_event(cur_cpu);
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qemu_tcg_wait_io_event();
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}
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return NULL;
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