>>> kernel /boot/xen.gz dom0_mem=262144 This was the problem, 256M might have been enough at old times, but giving kernel /boot/xen.gz dom0_mem=1048576 solved the problem. dmesg complained about Cannot allocate memory and this clue lead to the above fix. Thanks for all who have responded and sorry for the noise. - Gergely -- xen mailing list xen@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/xen