linux-kernel - Re: [GIT PULL] x86/cpu changes for v3.9

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Message-ID: <5123C3C5.9090100@oracle.com>
Date:	Tue, 19 Feb 2013 13:26:13 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...nel.org>,
	Konrad Rzeszutek Wilk <konrad@...nel.org>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] x86/cpu changes for v3.9

On 02/19/2013 01:21 PM, H. Peter Anvin wrote:
> On 02/19/2013 10:19 AM, Boris Ostrovsky wrote:
>> 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?
>>
>
> As I stated:
>
> >>>> 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.

Ah, sorry --- I missed that part.

-boris

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