Re: [PATCH v3 04/12] Add "handle page fault" PV helper.

From: Gleb Natapov
Date: Sun Jan 17 2010 - 09:45:16 EST

On Thu, Jan 14, 2010 at 06:31:07PM +0100, Peter Zijlstra wrote:
> On Tue, 2010-01-05 at 16:12 +0200, Gleb Natapov wrote:
> > Allow paravirtualized guest to do special handling for some page faults.
> >
> > The patch adds one 'if' to do_page_fault() function. The call is patched
> > out when running on physical HW. I ran kernbech on the kernel with and
> > without that additional 'if' and result were rawly the same:
> So why not program a different handler address for the #PF/#GP faults
> and avoid the if all together?
I would gladly use fault vector reserved by x86 architecture, but I am
not sure Intel will be happy about it.

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