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Date:	Sun, 8 Nov 2009 14:05:21 +0100
From:	Ingo Molnar <>
To:	Avi Kivity <>
Cc:	Gleb Natapov <>,,,,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>,
	Fr??d??ric Weisbecker <>
Subject: Re: [PATCH 02/11] Add "handle page fault" PV helper.

* Avi Kivity <> wrote:

> On 11/08/2009 02:51 PM, Ingo Molnar wrote:
> >>Maybe we should generalize paravirt-ops patching in case if (x) f() is
> >>deemed too expensive.
> >Yes, that's a nice idea. We have quite a number of 'conditional
> >callbacks' in various critical paths that could be made lighter via such
> >a technique.
> >
> > It would also free new callbacks from the 'it increases overhead 
> > even if unused' criticism and made it easier to add them.
> We can take the "immediate values" infrastructure as a first step. Has 
> that been merged?

No, there were doubts about whether patching in live instructions like 
that is safe on all CPU types.

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