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

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Message-ID: <20130322200941.GB6189@phenom.dumpdata.com>
Date:	Fri, 22 Mar 2013 16:09:41 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Josh Boyer <jwboyer@...hat.com>, hpa@...or.com
Cc:	Boris Ostrovsky <boris.ostrovsky@...cle.com>, mingo@...hat.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 08:08:45PM -0400, Josh Boyer wrote:
> 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.

Peter?

Would you like me or Boris to clean up the two patches with the
appropiate Acks and send them to you? 
> 
> josh
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