Commit c70aa540 authored May 02, 2012 by Jason Wang Committed by Michael S. Tsirkin May 02, 2012

vhost: zerocopy: poll vq in zerocopy callback



We add used and signal guest in worker thread but did not poll the virtqueue
during the zero copy callback. This may lead the missing of adding and
signalling during zerocopy. Solve this by polling the virtqueue and let it
wakeup the worker during callback.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

parent c8fb217a

drivers/vhost/vhost.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1603,6 +1603,7 @@ void vhost_zerocopy_callback(struct ubuf_info *ubuf)
		struct vhost_ubuf_ref *ubufs = ubuf->ctx;
		struct vhost_virtqueue *vq = ubufs->vq;

		vhost_poll_queue(&vq->poll);
		/* set len = 1 to mark this desc buffers done DMA */
		vq->heads[ubuf->desc].len = VHOST_DMA_DONE_LEN;
		kref_put(&ubufs->kref, vhost_zerocopy_done_signal);