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

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Message-ID: <1263490267.4244.340.camel@laptop>
Date:	Thu, 14 Jan 2010 18:31:07 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Gleb Natapov <gleb@...hat.com>
Cc:	kvm@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, riel@...hat.com,
	cl@...ux-foundation.org
Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.

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?

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