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
The bug is that the EventNotifiers do have a NULL io_flush callback. Because _none_ of the callbacks on the dataplane AioContext have such a callback, aio_poll will simply do nothing. Fixed by adding the callbacks: the ioeventfd will always be polled (this can change in the future to pause/resume the processing during live snapshots or similar operations); the ioqueue will be polled if there are outstanding requests. I must admit I have screwed up my testing somehow, because commit 2c20e71 does not work even if cherry-picked on top of 1.4.0, and this patch fixes it there as well. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>