"error: kvm run failed Invalid argument" Just curious, anybody else getting this with the 5.10 kernel?

I have upgraded my development box with the 5.10.4 kernel in -current and have been unable to start my Windows XP virtual machine using qemu-kvm, despite rebuilding qemu.
Apparently this is a known bug for which patches have been queued.

Seems to be a corner case affecting only some guests.