* Jeremy Fitzhardinge [off-list ref] wrote:

Wrap a set of interesting paravirt_ops calls in a wrapper which makes 
the callsites available for patching.  Unfortunately this is pretty 
ugly because there's no way to get gcc to generate a function call, 
but also wrap just the callsite itself with the necessary labels.

This patch supports functions with 0-4 arguments, and either void or 
returning a value.  64-bit arguments must be split into a pair of 
32-bit arguments (lower word first).  Small structures are returned in 
registers.

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...

	Ingo