Package: qemu-system-xen Version: 1:7.2+dfsg-6 Like qemu-system-x86, which xen-utils recommends in Bullseye and earlier, qemu-system-xen needs to depend on ipxe-firmware or attempts to start an HVM domU using uefi will fail with "failed to find romfile" error.
The workaround is, of course, to manually install ipxe-qemu. -- the warfare on the cutting edge of any science draws attention away from the huge uncontested background, the dull metal heft of the axe that gives the cutting edge its power. -- Dennett