For some unknown reason (possibly a regression), grub-install cannot determine the BIOS devices corresponding to virtio-blk devices. Therefore you have to create a /boot/grub/device.map file by hand before running grub-install. These two patches just note this in the documentation, and secondly enable the tests by writing this file before running grub-install. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into Xen guests. http://et.redhat.com/~rjones/virt-p2v