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