Comment # 1 on bug 1216791 from James Fehlig

(In reply to Luiz Angelo Daros de Luca from comment #0)
> For a couple of weeks, all UEFI machines stopped to work. When started, CPU
> goes 100% (1 core) and there is no display. Now I'm using TW 20231029.

I'd suggest trying an older qemu-ovmf-x86_64 package, e.g. prior to the
edk2-stable202308 update.

FYI, the few UEFI VMs on my TW test machine (20231030) work fine. I also had no
problems installing a new one via network boot.