linux-kernel - Re: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions

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Date:	Tue, 19 Oct 2010 20:49:08 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	tadeusz.struk@...el.com
Cc:	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	aidan.o.mahony@...el.com, gabriele.paoloni@...el.com,
	adrian.hoban@...el.com
Subject: Re: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions

On Tue, Oct 12, 2010 at 09:31:41AM +0100, tadeusz.struk@...el.com wrote:
> Hi Herbert,
> Resubmitting the two other patches as requested.
> Thanks,
> Tadeusz
> 
> >From 06444d8a95458d807ae14699e557739281d0b026 Mon Sep 17 00:00:00 2001
> From: Adrian Hoban <ahoban@...en.ir.intel.com>
> Date: Fri, 10 Sep 2010 18:08:45 +0100
> Subject: [PATCH 2/3] RFC4106 AES-GCM Driver Using Intel New Instructions
> 
> This patch adds an optimized RFC4106 AES-GCM implementation for 64-bit
> kernels. It supports 128-bit AES key size. This leverages the crypto
> AEAD interface type to facilitate a combined AES & GCM operation to
> be implemented in assembly code. The assembly code leverages Intel(R)
> AES New Instructions and the PCLMULQDQ instruction.

OK this patch applies now at least.  However it doesn't build:

  AS [M]  arch/x86/crypto/aesni-intel_asm.o
arch/x86/crypto/aesni-intel_asm.S: Assembler messages:
arch/x86/crypto/aesni-intel_asm.S:803: Error: no such instruction: `aesenc 16*1(%rdi),%xmm6'
arch/x86/crypto/aesni-intel_asm.S:803: Error: no such instruction: `aesenc 16*1(%rdi),%xmm7'
arch/x86/crypto/aesni-intel_asm.S:803: Error: no such instruction: `aesenc 16*1(%rdi),%xmm8'
...

I suppose you can't rely on these new binutils instructions just
yet.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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