[Qemu-devel] [PATCH] vhost: fix features ack

["Michael S. Tsirkin" <mst@redhat.com>]

From: David L Stevens <dlstevens@us.ibm.com>

vhost driver in qemu didn't ack features, and this happens
to work because we don't really require any features. However,
it's better not to rely on this. This patch passes features to
vhost as guest acks them.

Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

Anthony, here's a fixup patch to address an issue in vhost
patches. Incidentially, what's the status of the vhost patchset?


 hw/virtio-net.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/hw/virtio-net.c b/hw/virtio-net.c
index 9ddd58c..4c7c46e 100644
--- a/hw/virtio-net.c
+++ b/hw/virtio-net.c
@@ -218,6 +218,14 @@ static void virtio_net_set_features(VirtIODevice *vdev, uint32_t features)
                         (features >> VIRTIO_NET_F_GUEST_ECN)  & 1,
                         (features >> VIRTIO_NET_F_GUEST_UFO)  & 1);
     }
+    if (!n->nic->nc.peer ||
+        n->nic->nc.peer->info->type != NET_CLIENT_TYPE_TAP) {
+        return;
+    }
+    if (!tap_get_vhost_net(n->nic->nc.peer)) {
+        return;
+    }
+    return vhost_net_ack_features(tap_get_vhost_net(n->nic->nc.peer), features);
 }
 
 static int virtio_net_handle_rx_mode(VirtIONet *n, uint8_t cmd,
-- 
1.7.0.2.280.gc6f05