OL6u1_VM# cat /etc/oracle-release
Oracle Linux Server release 6.1
OL6u1_VM# uname -r
OL6u1_VM# dmesg | more
Xen version 3.4.
Xen Platform PCI: I/O protocol version 1
Netfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated NICs.
Blkfront and the Xen platform PCI driver have been compiled for this kernel: unplug emulated disks.
You might have to change the root device from /dev/hd[a-d] to /dev/xvd[a-d] in your root= kernel command line option