linux-kernel - Re: [PATCH] CPU Jitter RNG: inclusion into kernel crypto API and /dev/random

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Message-ID: <20131113171444.GA4973@amd.pavel.ucw.cz>
Date:	Wed, 13 Nov 2013 18:14:44 +0100
From:	Pavel Machek <pavel@....cz>
To:	Stephan Mueller <smueller@...onox.de>
Cc:	Clemens Ladisch <clemens@...isch.de>,
	Theodore Ts'o <tytso@....edu>,
	sandy harris <sandyinchina@...il.com>,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
	Nicholas Mc Guire <der.herr@...r.at>
Subject: Re: [PATCH] CPU Jitter RNG: inclusion into kernel crypto API and
 /dev/random

Hi!

> >BTW: MFENCE is not guaranteed to flush the instruction pipeline; you
> >need CPUID for that.
> 
> I was not aware of that. Can I simply call the CPUID instruction to read 
> it or do I have to do something special?

Simply call CPUID (warning, it clobbers some registers.).
								Pavel

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