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iothread: release AioContext around aio_poll

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This is the first step towards having fine-grained critical sections in
dataplane threads, which will resolve lock ordering problems between
address_space_* functions (which need the BQL when doing MMIO, even
after we complete RCU-based dispatch) and the AioContext.

Because AioContext does not use contention callbacks anymore, the
unit test has to be changed.

Previously applied as a0710f7995 and
then reverted.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <1477565348-5458-19-git-send-email-pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-10-27 12:49:06 +02:00 • committed by Fam Zheng
parent c9d1a56174
commit 65c1b5b622
5 changed files with 41 additions and 55 deletions
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11
iothread.c
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@ -40,7 +40,6 @@ AioContext *qemu_get_current_aio_context(void)
static void *iothread_run(void *opaque)
{
IOThread *iothread = opaque;
bool blocking;
rcu_register_thread();
@ -50,14 +49,8 @@ static void *iothread_run(void *opaque)
qemu_cond_signal(&iothread->init_done_cond);
qemu_mutex_unlock(&iothread->init_done_lock);
while (!iothread->stopping) {
aio_context_acquire(iothread->ctx);
blocking = true;
while (!iothread->stopping && aio_poll(iothread->ctx, blocking)) {
/* Progress was made, keep going */
blocking = false;
}
aio_context_release(iothread->ctx);
while (!atomic_read(&iothread->stopping)) {
aio_poll(iothread->ctx, true);
}
rcu_unregister_thread();