Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.
From: Peter Zijlstra <peterz@infradead.org>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
       avi@redhat.com, mingo@elte.hu, tglx@linutronix.de, hpa@zytor.com,
       riel@redhat.com, cl@linux-foundation.org
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References: <1262700774-1808-1-git-send-email-gleb@redhat.com>
	 <1262700774-1808-5-git-send-email-gleb@redhat.com>
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Date: Thu, 14 Jan 2010 18:31:07 +0100
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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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