[Xen-users] How to boot paravitrualized hosts in "linux rescue" mode to switch over to pygrub?

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Hello, folks.

I've got a bunch of para-virtualized DomU hosts that used the "kernel=" 
config files, with the partitions set to things like 
"phy:/dev/XENDISK/HOST-root,sda1,w". This has unfortunately become 
untenable for RHEL 5 hosting RHEL 4 clients, because maintaining the 
DomU kernel on hte Dom0 host causes fascinating RPM complaints.
I'd love to use the virt-install or virt-manager tools to boot from the 
network boot setup with a "linux rescue" option, so that I can mount a 
new Dom0 partition as a DomU drive, partition it, copy the materials 
over, and run "grub-install". But I'm having difficulty getting the 
system booted in that kind of "linux rescue" mode.
Rather than thrashing around myself, has anyone here done this or worked 
out how to do so? The virt-manager and virt-install tools don't seem to 
allow console access to the network boot's console options to select 
"rescue" mode. Do I have to do this through kickstart, or is there some 
more general approach?
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