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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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