Date: Sun, 17 Jan 2010 16:44:11 +0200
From: Gleb Natapov <gleb@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
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
Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper.
Message-ID: <20100117144411.GI31692@redhat.com>
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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.

--
			Gleb.
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