linux-kernel - Re: [PATCH v3] x86: clear incorrectly forced X86_FEATURE_LAHF

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Message-ID: <d1af83620908130757l2c5f2383ob9578669bf3d8f0@mail.gmail.com>
Date:	Thu, 13 Aug 2009 11:57:51 -0300
From:	Kevin Winchester <kjwinchester@...il.com>
To:	Borislav Petkov <borislav.petkov@....com>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	Borislav Petkov <petkovbb@...glemail.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] x86: clear incorrectly forced X86_FEATURE_LAHF_LM flag

2009/8/13 Borislav Petkov <borislav.petkov@....com>:
> 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.
>

Looking at your patch, I now see why my attempt to read/write the MSRs
failed - magic. :)

I will try these patches this evening when I get back to my computer
and let you know, but they look good to me.

Thanks for all the help,

-- 
Kevin Winchester
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