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Message-ID: <4A84A0BA.7040802@gmail.com>
Date: Thu, 13 Aug 2009 20:24:42 -0300
From: Kevin Winchester <kjwinchester@gmail.com>
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To: Borislav Petkov <borislav.petkov@amd.com>
CC: Mikael Pettersson <mikpe@it.uu.se>,
       Borislav Petkov <petkovbb@googlemail.com>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3] x86: clear incorrectly forced X86_FEATURE_LAHF_LM
 flag
References: <4A7E0797.7060504@gmail.com> <20090810131219.GD21879@aftab> <4A80A5AD.2000209@gmail.com> <19073.33348.459260.456740@pilspetsen.it.uu.se> <20090811155106.GB16173@aftab> <d1af83620908110855x75b1e5aeq6d814ca90c49ec22@mail.gmail.com> <20090811160116.GD16173@aftab> <4A8209B6.8050306@gmail.com> <20090812114038.GD15396@aftab> <4A8349F6.9080107@gmail.com> <20090813122337.GB7029@aftab>
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Borislav Petkov wrote:
> Hi Kevin,
> 
> On Wed, Aug 12, 2009 at 08:02:14PM -0300, Kevin Winchester wrote:
>> So that feature is definitely set.
> 
> thanks for testing. As a reply to that follow two patches for you to
> test. The one is adding some more msr functionality and the second is
> based on your original one which should in addition turn off the cpuid
> bit. Please apply, compile, reboot and run the small app again to verify
> that ECX[0] is now off.
> 
> Let me know how it goes.
> 

Yes, those patches seem to fix everything:

$ ./a.out  
0x8000_0001_ecx = 0x00000000

I just noticed that my original patch has been pulled into Linus' tree,
so you will likely want to rebase your patches on top of that.

Thank you again,

-- 
Kevin Winchester