[Qemu-devel] [PATCH] vhost_net: initialize acked_features to a safe value during ack

[Jason Wang <jasowang@redhat.com>]

commit 2e6d46d77ed328d34a94688da8371bcbe243479b (vhost: add
vhost_get_features and vhost_ack_features) removes the step that
initializes the acked_features to backend_features. This will result an
unexpected value of acked_features which may fail the features setting of
vhost. This patch fixes it by recover this step.

Cc: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Cc: Andrey Korolyov <andrey@xdel.ru>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
 hw/net/vhost_net.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
index f87c798..b1d4b1f 100644
--- a/hw/net/vhost_net.c
+++ b/hw/net/vhost_net.c
@@ -115,6 +115,7 @@ unsigned vhost_net_get_features(struct vhost_net *net, unsigned features)
 
 void vhost_net_ack_features(struct vhost_net *net, unsigned features)
 {
+    net->dev.acked_features = net->dev.backend_features;
     vhost_ack_features(&net->dev, vhost_net_get_feature_bits(net), features);
 }
 
-- 
1.8.3.1