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iothread: release iothread around aio_poll

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This is the first step towards having fine-grained critical sections in
dataplane threads, which resolves 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.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1424449612-18215-4-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-02-20 17:26:52 +01:00 • committed by Kevin Wolf
parent 49110174f8
commit a0710f7995
3 changed files with 14 additions and 24 deletions
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8
async.c
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@ -280,12 +280,6 @@ static void aio_timerlist_notify(void *opaque)
aio_notify(opaque);
}
static void aio_rfifolock_cb(void *opaque)
{
/* Kick owner thread in case they are blocked in aio_poll() */
aio_notify(opaque);
}
AioContext *aio_context_new(Error **errp)
{
int ret;
@ -303,7 +297,7 @@ AioContext *aio_context_new(Error **errp)
event_notifier_test_and_clear);
ctx->thread_pool = NULL;
qemu_mutex_init(&ctx->bh_lock);
rfifolock_init(&ctx->lock, aio_rfifolock_cb, ctx);
rfifolock_init(&ctx->lock, NULL, NULL);
timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx);
return ctx;