linux-kernel - Re: [PATCH 0/2 v2] perf-kvm support for SVM

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Message-ID: <20110117113421.GC31122@amd.com>
Date:	Mon, 17 Jan 2011 12:34:21 +0100
From:	"Roedel, Joerg" <Joerg.Roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Joerg Roedel <joro@...tes.org>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2 v2] perf-kvm support for SVM

On Sun, Jan 16, 2011 at 10:38:11AM -0500, Avi Kivity wrote:
> On 01/16/2011 05:35 PM, Joerg Roedel wrote:
> > On Sun, Jan 16, 2011 at 12:49:41PM +0200, Avi Kivity wrote:
> > >  On 01/14/2011 05:45 PM, Joerg Roedel wrote:
> >
> > >>  here is the reworked version of the patch-set. Only patch 1/2 has
> > >>  changed and now contains the real fix for the crashes that were seen and
> > >>  has an updated log message.
> > >>
> > >
> > >  Thanks, applied.  2.6.37 and earlier aren't affected, yes?  So I'm
> > >  queuing it for 2.6.38 only.
> >
> > I think the problem is there since KVM has lazy state switching. So the
> > fix in patch 1 should make it in all currently maintained stable-trees.
> >
> 
> The problem is with load_gs_index(), yes?  In 2.6.37 this is called 
> before stgi(), so it's protected from nmi.

Ok, you are right :) So the fix is only necessary for 2.6.38.

	Joerg

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