From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Bader Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running on bare metal Date: Thu, 21 Mar 2013 15:39:57 +0100 Message-ID: <514B1BBD.2030405@canonical.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> <20130321140757.GC28648@phenom.dumpdata.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0453775736771960734==" Return-path: In-Reply-To: <20130321140757.GC28648@phenom.dumpdata.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: xen-devel@lists.xen.org List-Id: xen-devel@lists.xenproject.org This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --===============0453775736771960734== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="------------enigC06011C0646AD3A128A7F7CB" This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigC06011C0646AD3A128A7F7CB Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable 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=3Dxen-devel&m=3D136206183814547&w=3D2 >>>>>>> >>>>>>> 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 th= e >>>> 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? >=20 > Roping in Stephan from Canonical as they are seeing it on a regular bas= is > 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 th= read (which added the lazy_mmu_flush). Well, I passed on the link to this thread so maybe this will get some con= firmation. >=20 > Stephan - there are two patches for it - the paravirt of lazy_mmu mode > and then the other one. >=20 > 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? >=20 >> >> josh >=20 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel >=20 --------------enigC06011C0646AD3A128A7F7CB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with undefined - http://www.enigmail.net/ iQIcBAEBCgAGBQJRSxu9AAoJEOhnXe7L7s6jGYoQALnHFrpK8jUS7RKEVlK9YAc2 6ZrA897HMFBeYKFBoB9Lz906jCcT088jLwzQGbTs+cpq+ovAw+PfxGhAOntgu5Kt Sa1xfXEGmSHFg/Qw46DEGg9PusMZmZJGdyqRGR3AXASSm0i1G479FOfvdN7vOwPK qAjTI6iR1YlySyNoLyBKhmywkaRpEpovgK/eTvoPLUPH0JXZ2NUgZj/+aUYnBbCn 444PxCL7RncABe7crEOO32VpM1oHIxHWU3sjRkRDLzNCcMlM6e2+47JhBUNb1cEE 9SAc/yDjiWde54bggE5zRF2UrqhAVTWvOG1LQPkiSQHbBg7LE2LrsiFcSvJ2wGz8 1OVWQLH2g7dD3FwbQweJubUskqWdRYnyPk8Zv3TsHf53KCjPVz5gcL7bO94rwEtr RTZtcUqgGuxMsXhgq9mTJg07a4rV0yRL4USvn7LfL7P6sKEismblqqFb4uqnnI2b RP4lsJhHH3OEKMg/4aOLSrwdd1Qog24u+RxsT67yTjGpKJfogR3P2j9zkZEHI7is exQO+DufOJSOucg5WTx22jn7Piqh3vAN9aOMHgnDlpKCNePm881CuJB/8qx49N7r uDIARdWR/VjcN95DkbY43UyNrN3NYIZmhz7JSd8fJ2kK8CKRoRymf3l9nUPiGp6y U22dA4v3MMA6uJ3wfEuC =1zRF -----END PGP SIGNATURE----- --------------enigC06011C0646AD3A128A7F7CB-- --===============0453775736771960734== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel --===============0453775736771960734==--