linux-kernel - Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable function

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Message-ID: <20161215210425.GX3207@twins.programming.kicks-ass.net>
Date:   Thu, 15 Dec 2016 22:04:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     Hannes Frederic Sowa <hannes@...essinduktion.org>,
        David Laight <David.Laight@...lab.com>,
        Netdev <netdev@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>,
        Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        "Daniel J . Bernstein" <djb@...yp.to>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Eric Biggers <ebiggers3@...il.com>
Subject: Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable
 function

On Thu, Dec 15, 2016 at 09:43:04PM +0100, Jason A. Donenfeld wrote:
> On Thu, Dec 15, 2016 at 9:31 PM, Hannes Frederic Sowa
> <hannes@...essinduktion.org> wrote:
> > ARM64 and x86-64 have memory operations that are not vector operations
> > that operate on 128 bit memory.
> 
> Fair enough. imull I guess.

imull is into rdx:rax, not memory. I suspect he's talking about
cmpxchg16b.