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virtio: disable notifications again after poll succeeded

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While AioContext is in polling mode virtqueue notifications are not
necessary.  Some device virtqueue handlers enable notifications.  Make
sure they stay disabled to avoid unnecessary vmexits.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Richard Henderson <rth@twiddle.net>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2017-01-12 11:46:11 +00:00 • committed by Michael S. Tsirkin
parent 332fa82d09
commit 1448c133e1
1 changed files with 3 additions and 0 deletions
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3
hw/virtio/virtio.c
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@ -2126,6 +2126,9 @@ static bool virtio_queue_host_notifier_aio_poll(void *opaque)
}
virtio_queue_notify_aio_vq(vq);
/* In case the handler function re-enabled notifications */
virtio_queue_set_notification(vq, 0);
return true;
}