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SubjectRe: [patch 14/26] Xen-paravirt_ops: add common patching machinery

* Jeremy Fitzhardinge <> wrote:

> Implement the actual patching machinery. paravirt_patch_default()
> contains the logic to automatically patch a callsite based on a few
> simple rules:
> - if the paravirt_op function is paravirt_nop, then patch nops
> - if the paravirt_op function is a jmp target, then jmp to it
> - if the paravirt_op function is callable and doesn't clobber too much
> for the callsite, call it directly
> paravirt_patch_default is suitable as a default implementation of
> paravirt_ops.patch, will remove most of the expensive indirect calls
> in favour of either a direct call or a pile of nops.

Acked-by: Ingo Molnar <>

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