linux-kernel - Re: [PATCH] sha: Enable cpuid check for Intel SHA extensions implementations

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Date:	Thu, 20 Aug 2015 08:03:14 -0700
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Dave Hansen <dave.hansen@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Chandramouli Narayanan <mouli@...ux.intel.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, mouli_7982@...oo.com
Subject: Re: [PATCH] sha: Enable cpuid check for Intel SHA extensions
 implementations

On Thu, 2015-08-20 at 06:08 +0200, Borislav Petkov wrote:
> On Wed, Aug 19, 2015 at 09:49:58AM -0700, Tim Chen wrote:

> > Mouli did the patch originally but he left the company.  So
> > I'm picking it up.
> 
> So the SOB chain should be:
> 
> From: you
> 
> <commit message>
> 
> Originally-by: Mouli
> Signed-off-by: you
> 

Thanks.  Revised patch embedded below.

Tim

--->8---
From: Tim Chen <tim.c.chen@...ux.intel.com>
Subject: [PATCH] sha: Enable cpuid check for Intel SHA extensions implementations

The Intel Secure Hash Algorithm Extensions are designed to improve the performance
of SHA-1 and SHA-256. This patch adds the check for X86_FEATURE_SHA_NI bit.

This will allow the feature to be shown in the /proc/cpuinfo.

The SHA extension programming guide is found in chapter 8 of the Intel
Architecture Instruction Set Extensions Programming reference:
https://software.intel.com/sites/default/files/managed/07/b7/319433-023.pdf

Originally-by: Chandramouli Narayanan <mouli@...ux.intel.com>
Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
---
 arch/x86/include/asm/cpufeature.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 3d6606f..a94f83d 100644
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -239,6 +239,7 @@
 #define X86_FEATURE_AVX512PF	( 9*32+26) /* AVX-512 Prefetch */
 #define X86_FEATURE_AVX512ER	( 9*32+27) /* AVX-512 Exponential and Reciprocal */
 #define X86_FEATURE_AVX512CD	( 9*32+28) /* AVX-512 Conflict Detection */
+#define X86_FEATURE_SHA_NI	( 9*32+29) /* SHA1/SHA256 Instruction Extensions */
 
 /* Extended state features, CPUID level 0x0000000d:1 (eax), word 10 */
 #define X86_FEATURE_XSAVEOPT	(10*32+ 0) /* XSAVEOPT */
-- 
1.8.3.1



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