Ok it is different, when spawning my focal guest I used my usual LXD
profile (which can run KVM) but the bionic guest to test this was from
scratch and didn't have that. So I actually checked a non-kvm capable
bionic system.

I have to retest the list in comment #6

When doing so we can almost right away go for qemu probing:
$ sudo qemu-system-x86_64 --enable-kvm --nographic --nodefaults -S -qmp-pretty 
stdio
{"execute":"qmp_capabilities"}
{"execute":"query-cpu-definitions"}

That will list all known CPUs and if they are not usable for e.g.
missing a CPU feature

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https://bugs.launchpad.net/bugs/1861643

Title:
  libvirt CPU model selection missing

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