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

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Date:	Tue, 28 Sep 2010 10:14:24 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	stefano.stabellini@...citrix.com,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	xen-devel@...ts.xensource.com,
	Jeremy Fitzhardinge <Jeremy.Fitzhardinge@...rix.com>,
	Stephen Tweedie <sct@...hat.com>
Subject: Re: [PATCH 12/12] xen/mtrr: Add mtrr_if support for Xen mtrr

 On 09/28/2010 05:39 AM, Ingo Molnar wrote:
> * 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.

Is your objection because we're adding a Xen mtrr implementation at all,
or because we're (slightly) extending the mtrr interface to do it?

Thanks,
    J
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