linux-kernel - Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu

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Message-ID: <5afe14ac-bc17-4fd1-9680-8f2566322437@default>
Date:	Wed, 20 Mar 2013 06:53:55 -0700 (PDT)
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	<jwboyer@...hat.com>
Cc:	<mingo@...hat.com>, <konrad.wilk@...cle.com>, <tglx@...utronix.de>,
	<rostedt@...dmis.org>, <kraman@...hat.com>,
	<gregkh@...uxfoundation.org>, <stable@...r.kernel.org>,
	<bp@...en8.de>, <samu.kallio@...rdeencloud.com>,
	<xen-devel@...ts.xen.org>, <linux-kernel@...r.kernel.org>,
	<hpa@...or.com>
Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running
 on bare metal


----- jwboyer@...hat.com 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=xen-devel&m=136206183814547&w=2
> > >>>>
> > >>>>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
> the
> > >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?


Any updates?

Thanks.
-boris
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