I know it is a lot of text, but not all of you have to read everything, so here my TL;DR: (IMHO)
- no libvirt regression; host-model never worked, just no one noticed so far
- Openstack should change (at least for that arch) to host-passthrough
- if the "feature" of host-model is really wanted it can be reenabled on a version check on qemu/libvirt > 2.9/3.2 (or later depending how things work out)
I know it is a lot of text, but not all of you have to read everything, so here my TL;DR: (IMHO)
- no libvirt regression; host-model never worked, just no one noticed so far
- Openstack should change (at least for that arch) to host-passthrough
- if the "feature" of host-model is really wanted it can be reenabled on a version check on qemu/libvirt > 2.9/3.2 (or later depending how things work out)