For the GPU passthrough, I reused what I did for Windows 10. After that, I think you have to add a few QEMU flags in the Virt Manager XML (have to find them), but after that, you just download an OpenCore ISO from github.com/thenickdude/KVM-Opencore and it pretty much just works (except for audio, which is something I’m working ob. I got a Pulse server running on MacOS once and forwarded it to my Linux sound server over the virtual network, but I haven’t been able to replicate that.) Every few months, they’ll update it with the latest OpenCore.