Description of problem:

When VIRTIO_F_NOTIFICATION_DATA feature is enabled, the guest can communicate the avail_idx in the notification itselfs saving the device a read to avail_idx. This opens up optimization opportunities. The main goal is to enable it for net devices.

Patches have been posted upstream adding this feature.

Version-Release number of selected component (if applicable):

How reproducible:
always

Steps to Reproduce:
1.
2.
3.

Actual results:
1ULL << VIRTIO_F_NOTIFICATION_DATA is not set in the feature bit

Expected results:

Notification data is enabled and virtio device can communicate.

Additional info: