Comment 1 for bug 2018172

https://libvirt.org/formatdomain.html#video-devices

as noted in the libvirt docs virtio was added in libvirt 1.3.0

The model element has a mandatory type attribute which takes the value "vga", "cirrus", "vmvga", "xen", "vbox", "qxl" ( since 0.8.6 ), "virtio" ( since 1.3.0 ), "gop" ( since 3.2.0 ), "bochs" ( since 5.6.0 ), "ramfb" ( since 5.9.0 ), or "none" ( since 4.6.0 ), depending on the hypervisor features available.

this has been supported for years we merely made it our default in nova.

OSP (redhats downstream distribution fo OpenStack) is not supported on rhel 9.1 in any capacity.

there is also no released package of Yoga / Zed as part of osp.

the most recent OSP release is based on wallaby based on rhel 9.0 and the upcoming 17.1
release will be wallaby on rhel 9.2

did you mean RDO? not OSP?