linux-kernel - Re: [PATCH] crypto: aes - make assembler implementation default for i386 and x86-64

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Date:	Tue, 12 Jun 2012 21:25:18 +0300
From:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	linux-crypto@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: aes - make assembler implementation default
 for i386 and x86-64

Quoting Herbert Xu <herbert@...dor.apana.org.au>:

> On Sat, Jun 09, 2012 at 05:50:55PM +0300, Jussi Kivilinna wrote:
>> AES is often built-in and therefore implementations other than aes-generic
>> don't get autoloaded by module-aliases. This is solved for aes-ni by cpuid
>> autoloading, but for x86-64/i586 assembler implementation cpuid matching
>> does not make much sense (aes-generic built-in but overridden by x86-64/i586
>> assembler implementation module). Instead change Kconfig so that assembler
>> implementation is default on x86-64 and i386.
>>
>> This patch also splits common parts exported to assembler implementations
>> from aes-generic to new module aes-common.
>>
>> Patch tested on x86-64, compile tested on i386 and arm.
>>
>> Signed-off-by: Jussi Kivilinna <jussi.kivilinna@...et.fi>
>
> I like the idea but I'm not sure about where we draw the line.
> E.g., why not enable padlock, or for that matter every single
> hardware implementation of AES?
>
> This can get unwieldy very quickly.
>

Well, how about letting arch specific assembler implementations  
replace aes-generic
completely.. in this case add "depends on !X86" on CRYPTO_AES_GENERIC.  
Hardware
modules get autoloaded (cpuid/pci/platform/etc) but generic assembler  
implementation
might as well be replacement as it cannot autoload depending on  
hardware support (or
it can, but will be always loaded).

-Jussi


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