So, to boot OL5U7, you pass xen_emul_unplug=never on the kernel boot line, which allows the machine to boot with the emulated devices, i.e. they are not unplugged.
Then, edit /etc/modprobe.conf to replace the emulated devices with xen-netfront and xen-blkfront:
Fiel /etc/modprobe.conf should look like this:
alias eth0 xen-netfront
alias scsi_hostadapter xen-blkfront
Then, rebuild initrd:
mkinitrd -f -v --builtin=ehci-hcd --builtin=ohci-hcd --builtin=uhci-hcd /boot/initrd-`uname -r`.img `uname -r`
And reboot. You may get kudzu renaming ifcfg-eth0 to ifcfg-eth0.bak on reboot, because it detects "new" hardware. If so, just rename it back and it should be fine.
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