Scanning the upstream libvirt git tree (https://libvirt.org/git/?p=libvirt.git) it looks like the patch set "[PATCH v2 00/21] PCI Multifunction hotplug/hotunplug support" is still not upstream accepted, i.e. not with libvirt 6.9 (which is the planned libvirt target release for hirsute/21.04).
Hence it's very unlikely that this can be picked up by and delivered with Ubuntu 21.04 (hirsute).
Scanning the upstream libvirt git tree (https:/ /libvirt. org/git/ ?p=libvirt. git) it looks like the patch set "[PATCH v2 00/21] PCI Multifunction hotplug/hotunplug support" is still not upstream accepted, i.e. not with libvirt 6.9 (which is the planned libvirt target release for hirsute/21.04).
Hence it's very unlikely that this can be picked up by and delivered with Ubuntu 21.04 (hirsute).