From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-s390-owner@kernel.org>
X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on
	aws-us-west-2-korg-lkml-1.web.codeaurora.org
Received: from vger.kernel.org (vger.kernel.org [23.128.96.18])
	by smtp.lore.kernel.org (Postfix) with ESMTP id 66A3FC433EF
	for <linux-s390@archiver.kernel.org>; Tue,  5 Jul 2022 22:00:16 +0000 (UTC)
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S229941AbiGEWAP (ORCPT <rfc822;linux-s390@archiver.kernel.org>);
        Tue, 5 Jul 2022 18:00:15 -0400
Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46930 "EHLO
        lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S229452AbiGEWAP (ORCPT
        <rfc822;linux-s390@vger.kernel.org>); Tue, 5 Jul 2022 18:00:15 -0400
Received: from mail.skyhub.de (mail.skyhub.de [5.9.137.197])
        by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 015531900E;
        Tue,  5 Jul 2022 15:00:13 -0700 (PDT)
Received: from zn.tnic (p200300ea970ff625329c23fffea6a903.dip0.t-ipconnect.de [IPv6:2003:ea:970f:f625:329c:23ff:fea6:a903])
        (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
        (No client certificate requested)
        by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 7D98D1EC0513;
        Wed,  6 Jul 2022 00:00:08 +0200 (CEST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim;
        t=1657058408;
        h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
         to:to:cc:cc:mime-version:mime-version:content-type:content-type:
         content-transfer-encoding:in-reply-to:in-reply-to:  references:references;
        bh=lOz+oyOsjcEjoVAd2V3Hhq+u+4OkEJ2jkFkxcvzXIp4=;
        b=rFDWw5O9FPqZ2ZGYqsf0oadvjBlURlepN3Il5jgiRH6uCMr2vSxWAKsVvY2JWqML4mf/sj
        K/RRPabIwevvNUNRlwHJPHF9g/MwhM4B9ks25BK+Z70zV3IxaYGx4hwS5Z15WYzM4SbxTQ
        ksG6jTJzlhCJibf0zj16UVr1u6l+cOo=
Date:   Wed, 6 Jul 2022 00:00:04 +0200
From:   Borislav Petkov <bp@alien8.de>
To:     "H. Peter Anvin" <hpa@zytor.com>
Cc:     "Jason A. Donenfeld" <Jason@zx2c4.com>,
        linux-arm-kernel@lists.infradead.org,
        linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org,
        linux-kernel@vger.kernel.org, x86@kernel.org,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Heiko Carstens <hca@linux.ibm.com>,
        Alexander Gordeev <agordeev@linux.ibm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>
Subject: Re: [PATCH] random: remove CONFIG_ARCH_RANDOM and "nordrand"
Message-ID: <YsS0ZLQw+QFA7XdJ@zn.tnic>
References: <20220705190121.293703-1-Jason@zx2c4.com>
 <YsSStCQQf008hF2F@zn.tnic>
 <YsSUkapje04MP2a1@zx2c4.com>
 <YsSXkNBtB6Ciy9iN@zn.tnic>
 <11C903CC-22A7-48EE-AD63-E71CC8D28B88@zytor.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Disposition: inline
In-Reply-To: <11C903CC-22A7-48EE-AD63-E71CC8D28B88@zytor.com>
Precedence: bulk
List-ID: <linux-s390.vger.kernel.org>
X-Mailing-List: linux-s390@vger.kernel.org

On Tue, Jul 05, 2022 at 02:50:34PM -0700, H. Peter Anvin wrote:
> It's just math. The only variable is your confidence level, i.e. at
> what level do you decide that the likelihood of pure chance is way
> smaller than the likelihood of hardware failure.

That might be but the likelyhood of certain BIOSes dropping the ball
after resume is 100%:

7879fc4bdc75 ("x86/rdrand: Sanity-check RDRAND output")

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette