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[209.132.180.67]) by mx.google.com with ESMTP id m6si1718752pgr.468.2018.01.25.08.26.07; Thu, 25 Jan 2018 08:26:21 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751264AbeAYQYz (ORCPT + 99 others); Thu, 25 Jan 2018 11:24:55 -0500 Received: from Galois.linutronix.de ([146.0.238.70]:35565 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750994AbeAYQYz (ORCPT ); Thu, 25 Jan 2018 11:24:55 -0500 Received: from hsi-kbw-5-158-153-52.hsi19.kabel-badenwuerttemberg.de ([5.158.153.52] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1eekHw-00044z-FT; Thu, 25 Jan 2018 17:22:08 +0100 Date: Thu, 25 Jan 2018 17:24:49 +0100 (CET) From: Thomas Gleixner To: Alan Cox cc: David Woodhouse , arjan@linux.intel.com, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, bp@alien8.de, peterz@infradead.org, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org, dave.hansen@intel.com, ashok.raj@intel.com, mingo@kernel.org Subject: Re: [PATCH v4 6/7] x86/cpufeature: Blacklist SPEC_CTRL on early Spectre v2 microcodes In-Reply-To: <20180125161547.33e63bb3@alans-desktop> Message-ID: References: <1516872189-16577-1-git-send-email-dwmw@amazon.co.uk> <1516872189-16577-7-git-send-email-dwmw@amazon.co.uk> <1516876994.30244.51.camel@infradead.org> <1516879213.30244.74.camel@infradead.org> <1516887714.30244.121.camel@infradead.org> <20180125161547.33e63bb3@alans-desktop> User-Agent: Alpine 2.20 (DEB 67 2015-01-07) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 25 Jan 2018, Alan Cox wrote: > > Here's what I have now. I'm happy enough with this, so the main thing > > I'm looking for is an ack from Alan for patch #5 of the series, if I've > > got that sufficiently correct now. > > You have my ACK for patch 5: Any further changes I'll submit as updates > once it's merged. > > I am happy with patch 5 and I think for 64bit we are probably done for > the mainstream. VIA/Centaur data would be nice. > > The microcode otoh I don't think makes sense - do you want to be secure > with a slightly higher risk of crashes or insecure ? Once you can point > at a newer ucode for each case then yes I personally at least think it > then makes sense to tell users they want the newer one. Yes, ideally we can tell the user to update to ucode rev > X for a particular SKU. Though with the current state of affairs all we can do is accumulate ucode revisions which are marked bad by Intels Quality Assumptions at a given day. Once Intel gets its act together and provides authoritative information we can revisit this and make it user friendly. You might be able to speculate more precisely when this is going to happen. Thanks, tglx