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

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Date:	Wed, 20 Mar 2013 20:08:45 -0400
From:	Josh Boyer <jwboyer@...hat.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.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

On Wed, Mar 20, 2013 at 06:53:55AM -0700, Boris Ostrovsky wrote:
> 
> ----- 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?

No.  I've still not heard from Krishna.

At this point I've tested it on bare metal quite a bit, and Konrad has
tested it on both bare metal and Xen.  That should already cover the
case Krishna was going to test anyway.  I suggest we move forward and
take the patch.

josh
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