Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755235Ab1FJKKS (ORCPT ); Fri, 10 Jun 2011 06:10:18 -0400 Received: from smtp.eu.citrix.com ([62.200.22.115]:44130 "EHLO SMTP.EU.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750769Ab1FJKKN (ORCPT ); Fri, 10 Jun 2011 06:10:13 -0400 X-IronPort-AV: E=Sophos;i="4.65,345,1304294400"; d="scan'208";a="6208734" Date: Fri, 10 Jun 2011 11:10:11 +0100 From: Tim Deegan To: Igor Mammedov CC: , Keir Fraser , Stabellini , "containers@lists.linux-foundation.org" , Li Zefan , "linux-kernel@vger.kernel.org" , , Michal Hocko , "linux-mm@kvack.org" , Keir Fraser , , "akpm@linux-foundation.org" , Hiroyuki Kamezawa , Paul Menage , Hiroyuki , "balbir@linux.vnet.ibm.com" Subject: Re: [Xen-devel] Possible shadow bug Message-ID: <20110610101011.GH5098@whitby.uk.xensource.com> References: <4DE8D50F.1090406@redhat.com> <4DEE26E7.2060201@redhat.com> <20110608123527.479e6991.kamezawa.hiroyu@jp.fujitsu.com> <4DF0801F.9050908@redhat.com> <20110609150133.GF5098@whitby.uk.xensource.com> <4DF0F90D.4010900@redhat.com> <20110610100139.GG5098@whitby.uk.xensource.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline In-Reply-To: <20110610100139.GG5098@whitby.uk.xensource.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1170 Lines: 26 At 11:01 +0100 on 10 Jun (1307703699), Tim Deegan wrote: > Actually, looking at the disassembly you posted, it looks more like it > might be an emulator bug in Xen; if Xen finds itself emulating the IMUL > instruction and either gets the logic wrong or does the memory access > wrong, it could cause that failure. And one reason that Xen emulates > instructions is if the memory operand is on a pagetable that's shadowed > (which might be a page that was recently a pagetable). > > ISTR that even though the RHEL xen reports a 3.0.x version it has quite > a lot of backports in it. Does it have this patch? > http://hg.uk.xensource.com/xen-3.1-testing.hg/rev/e8fca4c42d05 Oops, that URL doesn't work; I meant this: http://xenbits.xen.org/xen-3.1-testing.hg/rev/e8fca4c42d05 Tim. -- Tim Deegan Principal Software Engineer, Xen Platform Team Citrix Systems UK Ltd. (Company #02937203, SL9 0BG) -- 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/