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[Xen-devel] Re: [PATCH 12/12] xen/mtrr: Add mtrr_if support for Xen mtrr

To: "H. Peter Anvin" <hpa@xxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 12/12] xen/mtrr: Add mtrr_if support for Xen mtrr
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Tue, 28 Sep 2010 11:13:00 -0700
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, "sct@xxxxxxxxxx" <sct@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Jeremy Fitzhardinge <Jeremy.Fitzhardinge@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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References: <alpine.DEB.2.00.1009281217540.2864@kaball-desktop> <1285676218-26218-12-git-send-email-stefano.stabellini@xxxxxxxxxxxxx> <20100928123925.GA18208@xxxxxxx> <alpine.DEB.2.00.1009281455300.2864@kaball-desktop> <4CA2223B.9040400@xxxxxxxx> <4CA22C3C.3020209@xxxxxxxxx>
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 On 09/28/2010 10:56 AM, H. Peter Anvin wrote:
> On 09/28/2010 10:13 AM, Jeremy Fitzhardinge wrote:
>> Yes, we could just mask out the MTRR CPU feature and rely entirely on PAT.
>>
>> The alternative would be to use the wrmsr hooks to emulate the Intel
>> MTRR registers by mapping them to hypercalls, but that seems needlessly
>> complex.
>>
> Indeed.  Relying on pure PAT is the Right Thing[TM].

Is there a plan to formally deprecate /proc/mtrr and the kernel
infrastructure behind it?

    J

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