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Date: Tue, 19 Feb 2013 13:19:03 -0500
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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To: "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@kernel.org>
CC: Konrad Rzeszutek Wilk <konrad@kernel.org>, Borislav Petkov <bp@alien8.de>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] x86/cpu changes for v3.9
References: <20130219152503.GA14862@gmail.com> <20130219153655.GD26748@pd.tnic> <20130219154721.GA15876@gmail.com> <5123B897.9010607@zytor.com> <20130219174758.GB4465@pd.tnic> <20130219175726.GA18244@phenom.dumpdata.com>
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On 02/19/2013 12:57 PM, Konrad Rzeszutek Wilk wrote:
> On Tue, Feb 19, 2013 at 06:47:58PM +0100, Borislav Petkov wrote:
>> On Tue, Feb 19, 2013 at 09:38:31AM -0800, H. Peter Anvin wrote:
>>> My fault... I was tracking the fix and lost track of the thread.
>>>
>>> The problem is that the fix is necessary but not sufficient, as it
>>> introduces an undesirable host-guest dependency.  In order to allow
>>> neerw guests to work on older hosts we also should use the
>>> {rd,wr}msr_safe() functions to manipulate this MSR, with a comment
>>> as to why.
>>>
>>> Boris, could you prepare such a patch, please?
>> I don't think Boris O. is at AMD anymore. Want me to add that to my fix
>> for kvm or prep a separate patch?
> CC-ing Boris.

BorisP's patch is what I should have done. Can you take it?

-boris