| Date | Fri, 16 Mar 2007 10:24:45 +0100 | From | Ingo Molnar <> | Subject | Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable |
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* Jeremy Fitzhardinge <jeremy@goop.org> 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...
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