https://etherpad.opendev.org/p/r.6ad6a4b8c378756c66185a7b35f1bcf9#L388

as discussed in the ptg this may be possible by reusing the neutron port taging feature which is separate form the nova port tagging feature.

we may need the tag extension to be amended to allow key value tags.
this would require a neutron spec to detail this api change.

the nova team need to review the apis shared by the neutron team
to understand if the port hints extension (admin only?)
https://review.opendev.org/c/openstack/neutron/+/870081/12/neutron/api/definitions/port_hints.py

This feature would likely be required to enable generic vdpa.

https://review.opendev.org/c/openstack/nova-specs/+/879338/6/specs/2023.2/approved/generic-vdpa-support.rst

as with OSPRH-49 the precidence relationship between hw_vir_model on the port and in the image is as follows

if hw_vif_model is set on the port then that will be used
if now we will fallback to the image porperty
if that is not set we fallback to libosinfo
and finally we fallback to the virt dirver default (virtio-net)