Comment # 20 on bug 909547 from Wilson Hein

(In reply to Wilson Hein from comment #19)
> Example If I cleanly rebuild libvirt, and not create any guest VMs, and
> reboot the host, VM creation fails with errors. Untested recently, I believe
> that in this condition xl create, or vm-install with the usexl switch would
> likely fail as well.

This isn't fully correct. VM creation in virt-manager would fail. Direct use of
xl in this condition might work. I've not attempted this latter case since I
want managed guests.