linux-kernel - Re: [RFC 7/7] crypto: Add PCLMULQDQ accelerated GHASH implementation

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Message-ID: <20090621135121.GA3153@gondor.apana.org.au>
Date:	Sun, 21 Jun 2009 21:51:21 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Huang Ying <ying.huang@...el.com>
Cc:	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [RFC 7/7] crypto: Add PCLMULQDQ accelerated GHASH
	implementation

Huang Ying <ying.huang@...el.com> wrote:
> PCLMULQDQ is used to accelerate the most time-consuming part of GHASH,
> carry-less multiplication. More information about PCLMULQDQ can be
> found at:
> 
> http://software.intel.com/en-us/articles/carry-less-multiplication-and-its-usage-for-computing-the-gcm-mode/
> 
> Because PCLMULQDQ changes XMM state, its usage must be enclosed with
> kernel_fpu_begin/end, which can be used only in process context, the
> acceleration is implemented as crypto_ahash. That is, request in soft
> IRQ context will be deferred to the cryptd kernel thread.
> 
> Signed-off-by: Huang Ying <ying.huang@...el.com>

All good.

So once we fully convert everything to shash, this series can
go in with the minor changes mentioned in this thread.

Thanks!
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