Fyi, I booted the Opensuse install disc with ... bios = 'ovmf' bios_override = '/usr/share/qemu/ovmf-x86_64.bin' builder = 'hvm' xen_platform_pci = 1 device_model_version="qemu-xen" ... I get to the main menu, and can select "Installer". The installer launches and I can get to the "Create Partition Setup" screens and start making changes. I haven't taken it further yet. So I can get this far with a 'clean' install. I just can't boot any existing, previously working Guests. Also, I don't know if it matters, but I see the "Product" for this BUG is set to "Opensuse Tumbleweed". My OP, referenced in Comment #1, was for Opensyse Leap 42.1, and that's still what I'm using & reporting about.