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

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Date:	Fri, 22 Mar 2013 13:25:21 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Josh Boyer <jwboyer@...hat.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
Subject: Re: [PATCH] mm/x86: Patch out arch_flush_lazy_mmu_mode() when running on bare metal

Sure.

Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:

>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

-- 
Sent from my mobile phone. Please excuse brevity and lack of formatting.
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