linux-kernel - Re: [PATCH 12/12] xen/mtrr: Add mtrr

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Message-ID: <20100928123925.GA18208@elte.hu>
Date:	Tue, 28 Sep 2010 14:39:25 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	stefano.stabellini@...citrix.com,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	Stephen Tweedie <sct@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 12/12] xen/mtrr: Add mtrr_if support for Xen mtrr


* stefano.stabellini@...citrix.com <stefano.stabellini@...citrix.com> wrote:

> From: Stephen Tweedie <sct@...hat.com>
> 
> Add a Xen mtrr type, and reorganise mtrr initialisation slightly to
> allow the mtrr driver to set up num_var_ranges (Xen needs to do this by
> querying the hypervisor itself.)
> 
> [ Impact: add basic MTRR support ]
> 
> Signed-off-by: Stephen Tweedie <sct@...hat.com>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> ---
>  arch/x86/kernel/cpu/mtrr/Makefile |    2 +-
>  arch/x86/kernel/cpu/mtrr/main.c   |    3 +
>  arch/x86/kernel/cpu/mtrr/mtrr.h   |    7 ++
>  arch/x86/kernel/cpu/mtrr/xen.c    |  110 +++++++++++++++++++++++++++++++++++++
>  4 files changed, 121 insertions(+), 1 deletions(-)
>  create mode 100644 arch/x86/kernel/cpu/mtrr/xen.c

Still NAK, for the very same reasons as we NAK-ed it the previous time: 
/proc/mtrr is a problematic and complicated legacy interface that should 
die. Any modern X server will do the right thing via PAT.

Also, please get the Ack of at least one x86 maintainer for x86 patches.

Thanks,

	Ingo
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