From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail138.messagelabs.com (mail138.messagelabs.com [216.82.249.35]) by kanga.kvack.org (Postfix) with SMTP id 8C1D26B0047 for ; Sun, 17 Jan 2010 09:44:26 -0500 (EST) Date: Sun, 17 Jan 2010 16:44:11 +0200 From: Gleb Natapov Subject: Re: [PATCH v3 04/12] Add "handle page fault" PV helper. Message-ID: <20100117144411.GI31692@redhat.com> References: <1262700774-1808-1-git-send-email-gleb@redhat.com> <1262700774-1808-5-git-send-email-gleb@redhat.com> <1263490267.4244.340.camel@laptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1263490267.4244.340.camel@laptop> Sender: owner-linux-mm@kvack.org To: Peter Zijlstra 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 List-ID: 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org