From: Ingo Molnar <redacted>
Date: Fri, 16 Mar 2007 10:24:45 +0100

ugh. This is beyond ugly! Why dont we just compile two images, one for 
Xen and one for native, do two passes to get those two images and 
'merge' them into a single vmlinuz (so that we still have a 'single' 
kernel unit to deal with on the distro side). This way we avoid all this 
crazy, limited, fragile patchery business...

Perhaps the problem can be dealt with using ELF relocations.

There is another case, discussed yesterday on netdev, where run-time
resolution of ELF relocations would be useful (for
very-very-very-read-only variables) so if it can solve this problem
too it would be nice to have a generic infrastructure for it.