Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933448Ab3CUOIi (ORCPT ); Thu, 21 Mar 2013 10:08:38 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:29534 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758357Ab3CUOIg (ORCPT ); Thu, 21 Mar 2013 10:08:36 -0400 Date: Thu, 21 Mar 2013 10:07:57 -0400 From: Konrad Rzeszutek Wilk To: Josh Boyer , stefan.bader@canonical.com Cc: Boris Ostrovsky , "H. Peter Anvin" , Borislav Petkov , mingo@redhat.com, tglx@linutronix.de, rostedt@goodmis.org, gregkh@linuxfoundation.org, samu.kallio@aberdeencloud.com, kraman@redhat.com, xen-devel@lists.xen.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running on bare metal Message-ID: <20130321140757.GC28648@phenom.dumpdata.com> References: <1362092149-32381-1-git-send-email-boris.ostrovsky@oracle.com> <20130228233720.GB17468@pd.tnic> <20130301000539.GA31649@hansolo.jdub.homelinux.org> <512FF331.5050008@zytor.com> <20130301003629.GG9767@pd.tnic> <20130301004211.GB31649@hansolo.jdub.homelinux.org> <512FFBC4.4070400@zytor.com> <20130301121444.GC31649@hansolo.jdub.homelinux.org> <51407E58.8020200@oracle.com> <20130313134442.GE7718@hansolo.jdub.homelinux.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20130313134442.GE7718@hansolo.jdub.homelinux.org> User-Agent: Mutt/1.5.21 (2010-09-15) X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1845 Lines: 43 On Wed, Mar 13, 2013 at 09:44:43AM -0400, Josh Boyer wrote: > On Wed, Mar 13, 2013 at 09:25:44AM -0400, Boris Ostrovsky wrote: > > On 03/01/2013 07:14 AM, Josh Boyer wrote: > > >On Thu, Feb 28, 2013 at 04:52:20PM -0800, H. Peter Anvin wrote: > > >>On 02/28/2013 04:42 PM, Josh Boyer wrote: > > >>>On Fri, Mar 01, 2013 at 01:36:29AM +0100, Borislav Petkov wrote: > > >>>>On Thu, Feb 28, 2013 at 04:15:45PM -0800, H. Peter Anvin wrote: > > >>>>>>I'll try to get someone to test this tomorrow. > > >>>>Btw, you'd need to apply that other patch too > > >>>> > > >>>>http://marc.info/?l=xen-devel&m=136206183814547&w=2 > > >>>> > > >>>>so that arch_flush_lazy_mmu_mode() has at least one caller on x86_64. > > >>>Yeah, we already have that applied. It stops crashes in xen > > >>>environments so we pulled it in as a bugfix. Thanks though! > > >>> > > >>Who are "we"? > > >Sorry, Fedora. That patch has a link to a bug in it. We applied the > > >patch for that bug. I'll apply Boris' patch on top and get the same > > >people to test it. > > > > Josh, have you had a chance to test this? > > I've tested it on bare metal for a while now. No problems noticed at > all. I've not heard back from Krishna who was testing it in the Xen > environment. Krishna? Roping in Stephan from Canonical as they are seeing it on a regular basis and is affecting their distro. Stephan - there are two patches for it - the paravirt of lazy_mmu mode and then the other one. This thread should provide the right URLs (I hope). Could you (if it is possible) try them out and see if they fix the issue? > > josh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/