[18/64] vhost-vdpa: don't initialize backend_features

Commit Message

Michael Roth Oct. 19, 2021, 2:08 p.m. UTC

From: Jason Wang <[e-mail]>

We used to initialize backend_features during vhost_vdpa_init()
regardless whether or not it was supported by vhost. This will lead
the unsupported features like VIRTIO_F_IN_ORDER to be included and set
to the vhost-vdpa during vhost_dev_start. Because the
VIRTIO_F_IN_ORDER is not supported by vhost-vdpa so it won't be
advertised to guest which will break the datapath.

Fix this by not initializing the backend_features, so the
acked_features could be built only from guest features via
vhost_net_ack_features().

Fixes: 108a64818e69b ("vhost-vdpa: introduce vhost-vdpa backend")
Cc: [e-mail]
Cc: Gautam Dawar <[e-mail]>
Signed-off-by: Jason Wang <[e-mail]>
(cherry picked from commit c33f23a419f95da16ab4faaf08be635c89b96ff0)
Signed-off-by: Michael Roth <[e-mail]>
---
 hw/virtio/vhost-vdpa.c | 3 ---
 1 file changed, 3 deletions(-)

Patch

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 01d2101d09..5fe43a4eb5 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -275,15 +275,12 @@  static void vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status)
 static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque)
 {
     struct vhost_vdpa *v;
-    uint64_t features;
     assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA);
     trace_vhost_vdpa_init(dev, opaque);
 
     v = opaque;
     v->dev = dev;
     dev->opaque =  opaque ;
-    vhost_vdpa_call(dev, VHOST_GET_FEATURES, &features);
-    dev->backend_features = features;
     v->listener = vhost_vdpa_memory_listener;
     v->msg_type = VHOST_IOTLB_MSG_V2;