[Qemu-devel] [PATCH] vhost_net: init acked_features to backend_features

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

commit 2e6d46d77ed328d34a94688da8371bcbe243479b (vhost: add
vhost_get_features and vhost_ack_features) removes the step that
initializes the acked_features to backend_features.

As this field is now uninitialized, vhost initialization will sometimes
fail.

To fix, initialize field in core vhost code.

As the next step, cleanup vhost scsi code as well.

Reported-by: Jason Wang <jasowang@redhat.com>
Reported-by: Andrey Korolyov <andrey@xdel.ru>
Cc: Nikolay Nikolaev <n.nikolaev@virtualopensystems.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/virtio/vhost.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 5d7c40a..e42e51f 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -873,6 +873,9 @@ int vhost_dev_init(struct vhost_dev *hdev, void *opaque,
     hdev->memory_changed = false;
     memory_listener_register(&hdev->memory_listener, &address_space_memory);
     hdev->force = force;
+    /* Set minimal required set of features. */
+    hdev->acked_features = hdev->backend_features;
+
     return 0;
 fail_vq:
     while (--i >= 0) {
-- 
MST