From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta7.messagelabs.com (mail6.bemta7.messagelabs.com [216.82.255.55]) by kanga.kvack.org (Postfix) with ESMTP id 748686B00EC for ; Fri, 10 Jun 2011 06:10:15 -0400 (EDT) Date: Fri, 10 Jun 2011 11:10:11 +0100 From: Tim Deegan 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> Sender: owner-linux-mm@kvack.org List-ID: To: Igor Mammedov Cc: xen-devel@lists.xensource.com, Keir Fraser , Stabellini , "containers@lists.linux-foundation.org" , Li Zefan , "linux-kernel@vger.kernel.org" , Stefano@phlegethon.org, Michal Hocko , "linux-mm@kvack.org" , Keir Fraser , KAMEZAWA@phlegethon.org, "akpm@linux-foundation.org" , Hiroyuki Kamezawa , Paul Menage , Hiroyuki , "balbir@linux.vnet.ibm.com" 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, 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org