From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running on bare metal Date: Thu, 21 Mar 2013 21:11:08 -0400 Message-ID: <20130322011108.GE28902@phenom.dumpdata.com> References: <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> <20130321140757.GC28648@phenom.dumpdata.com> <514B1BBD.2030405@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <514B1BBD.2030405@canonical.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Stefan Bader Cc: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org On Thu, Mar 21, 2013 at 03:39:57PM +0100, Stefan Bader wrote: > On 21.03.2013 15:07, Konrad Rzeszutek Wilk wrote: > > 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. > > That is unfortunately overstated. Just was asked about it by someone who seems > affected and who had found the redhat bug. From that I found the other thread > (which added the lazy_mmu_flush). > Well, I passed on the link to this thread so maybe this will get some confirmation. Aaah. Sorry for that. > > > > > 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 > > > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.xen.org > > http://lists.xen.org/xen-devel > > > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel