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vhost: zerocopy: poll vq in zerocopy callback 

commit c70aa540c7a9f67add11ad3161096fb95233aa2e upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Wang 2013-08-06 17:29:18 +08:00 committed by Greg Kroah-Hartman
parent d22586ffdd
commit 334e23c6f2
1 changed files with 1 additions and 0 deletions
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drivers/vhost/vhost.c
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@ -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);