Changes and New Features

Changes and New Features in v1.9.0

Added support for virtio feature bit VIRTIO_NET_F_HOST_USO
Added support for virtio feature bit VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
Added support for virtio feature bit VIRTIO_NET_F_GUEST_ANNOUNCE
Added support for virtio feature bit VIRTIO_F_MRG_RX_BUFFER; must enable from config file
Added support for packed VQ at beta level; must enable from config file