linux-kernel - Re: [Xen-devel] Possible shadow bug

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Message-ID: <20110610101011.GH5098@whitby.uk.xensource.com>
Date:	Fri, 10 Jun 2011 11:10:11 +0100
From:	Tim Deegan <Tim.Deegan@...rix.com>
To:	Igor Mammedov <imammedo@...hat.com>
CC:	<xen-devel@...ts.xensource.com>, Keir Fraser <keir@....org>,
	Stabellini <stefano.stabellini@...citrix.com>,
	"containers@...ts.linux-foundation.org" 
	<containers@...ts.linux-foundation.org>,
	Li Zefan <lizf@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	<Stefano@...egethon.org>, Michal Hocko <mhocko@...e.cz>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Keir Fraser <keir.xen@...il.com>, <KAMEZAWA@...egethon.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Paul Menage <menage@...gle.com>,
	Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: Re: [Xen-devel] Possible shadow bug

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 <Tim.Deegan@...rix.com>
Principal Software Engineer, Xen Platform Team
Citrix Systems UK Ltd.  (Company #02937203, SL9 0BG)
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