Comment # 1 on bug 1206237 from James Fehlig

(In reply to Dominique Leuenberger from comment #0)
> ## Observation
> 
> This is possibly a regression from libvirt update 8.9->8.10
> 
> the test launches a nested VM using
> virt-install --memory=512 --name=nested_vm_test --graphics=vnc --disk=none
> --boot=cdrom)

I'm surprised this test ever worked. The same virt-install command fails on my
TW host due to missing OS name

# virt-install --memory=512 --name=nested_vm_test --graphics=vnc --disk=none
--boot=cdrom
ERROR    
--os-variant/--osinfo OS name is required, but no value was
set or detected.

This is now a fatal error. Specifying an OS name is required
for modern, performant, and secure virtual machine defaults.

You can see a full list of possible OS name values with:

   virt-install --osinfo list

If your Linux distro is not listed, try one of generic values
such as: linux2022, linux2020, linux2018, linux2016

If you just need to get the old behavior back, you can use:

  --osinfo detect=on,require=off

Or export VIRTINSTALL_OSINFO_DISABLE_REQUIRE=1