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vhost: clear signalled_used_valid on vhost stop 

When vhost device stops, its implementation synchronizes kernel state
back to virtio.c so we can continue emulating the device
in userspace.

This patch ensures that virtio.c's signalled_used_valid flag is reset so
that userspace does not suppress guest notifications due to stale
signalled_used values.

Cc: qemu-stable@nongnu.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-08-12 12:21:36 +03:00
parent 6793dfd1b6
commit 3561ba1418
1 changed files with 1 additions and 0 deletions
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1
hw/virtio/vhost.c
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@ -762,6 +762,7 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev,
fflush(stderr);
}
virtio_queue_set_last_avail_idx(vdev, idx, state.num);
virtio_queue_invalidate_signalled_used(vdev, idx);
assert (r >= 0);
cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
0, virtio_queue_get_ring_size(vdev, idx));