linux-kernel - Re: [patch 0/3] crypto: padlock-aes: enable on VIA Nano

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Message-ID: <20090609184552.GL5304@prithivi.gnumonks.org>
Date:	Wed, 10 Jun 2009 02:45:52 +0800
From:	Harald Welte <HaraldWelte@...tech.com>
To:	Chuck Ebbert <cebbert@...hat.com>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Subject: Re: [patch 0/3] crypto: padlock-aes: enable on VIA Nano

On Tue, Jun 09, 2009 at 10:35:33AM -0400, Chuck Ebbert wrote:
> The VIA Nano has a bug that makes the padlock unit fetch extra data
> during encryption operations. Add workarounds for that, and enable
> the driver on x86_64.

Thanks!

Where did you get the errata from, and what kind of document / revision is it?
I have not seen that document so far.

I've asked Centaur to confirm the errata, also inquired whether there will be
a microcode update or a new stepping to fix it.  If yes, we should add proper
checks to the workaround to make sure it's only enabled when we need it.

Out of curiosity: Only the ACE (crypto) is affected, not PHE (hashing)?

I'll also put on my todo list to do some actual benchmarking to determine
how much impact this bug has.  I expect especially for storage encryption,
many crypto operations will be page aligned and thus need the extra memcpy :(

p.s.: the patch to enable padlock on x86_64 is already in the crypto-dev tree,
as far as I know.  Interestingly, I have not observed this problem so far,
despite running dm-crypt on a nano for quite some time. 

Cheers,
-- 
- Harald Welte <HaraldWelte@...tech.com>	    http://linux.via.com.tw/
============================================================================
VIA Free and Open Source Software Liaison
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