linux-kernel - Re: [PATCH 1/6] x86/intel_cat: Intel Cache Allocation Technology detection

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Date:	Tue, 3 Feb 2015 10:57:27 +0000
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	hpa@...or.com, tglx@...utronix.de, mingo@...nel.org, tj@...nel.org,
	peterz@...radead.org, matt.fleming@...el.com, will.auld@...el.com
Subject: Re: [PATCH 1/6] x86/intel_cat: Intel Cache Allocation Technology
 detection

On Tue, 27 Jan, at 04:00:04PM, Vikas Shivappa wrote:
> This patch adds support for the new Cache Allocation Technology (CAT)
> feature found in future Intel Xeon processors.  It includes CPUID
> enumeration routines for CAT and new values to track CAT resources to
> the cpuinfo_x86 structure.
> 
> Cache Allocation Technology(CAT) provides a way for the Software
> (OS/VMM) to restrict cache allocation to a defined 'subset' of cache
> which may be overlapping with other 'subsets'.  This feature is used
> when allocating a line in cache ie when pulling new data into the cache.
> The programming of the h/w is done via programming  MSRs.
> 
> More information about CAT be found in the Intel (R) x86 Architecture
> Software Developer Manual, section 17.15.
> 
> Signed-off-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
> ---
>  arch/x86/include/asm/cpufeature.h |  6 ++++-
>  arch/x86/include/asm/processor.h  |  3 +++
>  arch/x86/kernel/cpu/Makefile      |  1 +
>  arch/x86/kernel/cpu/common.c      | 16 ++++++++++++
>  arch/x86/kernel/cpu/intel_cat.c   | 51 +++++++++++++++++++++++++++++++++++++++
>  init/Kconfig                      | 11 +++++++++
>  6 files changed, 87 insertions(+), 1 deletion(-)
>  create mode 100644 arch/x86/kernel/cpu/intel_cat.c

Acked-by: Matt Fleming <matt.fleming@...el.com>

-- 
Matt Fleming, Intel Open Source Technology Center
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