vhost-net: disable mergeable buffers

vhost in current kernels doesn't support mergeable buffers.
Disable this feature if vhost is enabled, until such
support is implemented.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

hw/vhost_net.c

@@ -51,6 +51,7 @@ unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
     if (!(net->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) {
         features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC);
     }
+    features &= ~(1 << VIRTIO_NET_F_MRG_RXBUF);
     return features;
 }