From: "Michael S. Tsirkin" <m...@redhat.com>
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-sta...@nongnu.org
Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
(cherry picked from commit 3561ba14188b3c1e54246ed6db97896bbc082d2f)
Signed-off-by: Michael Roth <mdr...@linux.vnet.ibm.com>
---
hw/virtio/vhost.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index fbabf99..0dabf26 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -761,6 +761,7 @@ 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));
--
1.7.9.5
