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

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Message-ID: <20110610114821.GB32595@reaktio.net>
Date:	Fri, 10 Jun 2011 14:48:21 +0300
From:	Pasi Kärkkäinen <pasik@....fi>
To:	Tim Deegan <Tim.Deegan@...rix.com>
Cc:	Igor Mammedov <imammedo@...hat.com>, Stefano@...egethon.org,
	Paul Menage <menage@...gle.com>, 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>,
	Michal Hocko <mhocko@...e.cz>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Keir Fraser <keir.xen@...il.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA@...egethon.org, Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
Subject: Re: [Xen-devel] Possible shadow bug

On Fri, Jun 10, 2011 at 11:10:11AM +0100, Tim Deegan wrote:
> 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
> 

RHEL5 Xen (hypervisor) reports version as 3.1.2-xyz..

-- Pasi

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