Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754484AbaGPXAc (ORCPT ); Wed, 16 Jul 2014 19:00:32 -0400 Received: from terminus.zytor.com ([198.137.202.10]:46782 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752657AbaGPXAa (ORCPT ); Wed, 16 Jul 2014 19:00:30 -0400 Message-ID: <53C703ED.2010605@zytor.com> Date: Wed, 16 Jul 2014 15:59:57 -0700 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Andy Lutomirski CC: kvm list , "Theodore Ts'o" , "linux-kernel@vger.kernel.org" , Kees Cook , X86 ML , Daniel Borkmann , Srivatsa Vaddagiri , Raghavendra K T , Gleb Natapov , Paolo Bonzini , Bandan Das Subject: Re: [PATCH v3 2/5] random,x86: Add arch_get_slow_rng_u64 References: <5778e65d5ca52bebbaa023e177d863e44f098e96.1405546879.git.luto@amacapital.net> <53C6F5A9.80400@zytor.com> In-Reply-To: X-Enigmail-Version: 1.6 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/16/2014 03:40 PM, Andy Lutomirski wrote: > On Wed, Jul 16, 2014 at 3:13 PM, Andy Lutomirski wrote: >> My personal preference is to defer this until some user shows up. I >> think that even this would be too complicated for KASLR, which is the >> only extremely early-boot user that I found. >> >> Hmm. Does the prandom stuff want to use this? > > prandom isn't even using rdrand. I'd suggest fixing this separately, > or even just waiting until someone goes and deletes prandom. > prandom is exactly the opposite; it is designed for when we need possibly low quality random numbers very quickly. RDRAND is actually too slow. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/