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[209.132.180.67]) by mx.google.com with ESMTP id i23-v6si1191042pll.172.2018.01.25.03.21.05; Thu, 25 Jan 2018 03:21:19 -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; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=NyHq/6nT; 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 S1751701AbeAYLUf (ORCPT + 99 others); Thu, 25 Jan 2018 06:20:35 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:32900 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751655AbeAYLUe (ORCPT ); Thu, 25 Jan 2018 06:20:34 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=guU1aqGmrzjLoynRGvOS3Fa4K1QhDY3Mjl2wasxdggA=; b=NyHq/6nTsvc7ika0TQD4mkgFx 5QpmceHIP9zAiVPvs++6A3MBph20BmMj7evxGSW8om2KuLcHQKNjV4+7TGtEO/vuuLMgdih3Kggd8 3E5gYIn6+shsufh16AwSqrlO2yFaQ/7cyaF9CY23P2qr9/xITMfU+BS/a6WnELKoL2yMLRvlyplxF MOL4MNs7htlvge46yXM8CbgIsCZsj2Z9WYH9kpOq3mU+swVIZcetpacEPEM99XS5Z3d21/CaSRzQ1 0Zo9qwUXi0rQYKrSf0l64VyNWNx5Q6RckBFX3BjMfABl2drmMqEB+njcCJq1hjmvOLgtHRaLdVcVZ yvJu0paWg==; Received: from [2001:8b0:10b:1:88df:f864:4b91:a1c5] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eefZm-0007Pk-NL; Thu, 25 Jan 2018 11:20:17 +0000 Message-ID: <1516879213.30244.74.camel@infradead.org> Subject: Re: [PATCH v4 6/7] x86/cpufeature: Blacklist SPEC_CTRL on early Spectre v2 microcodes From: David Woodhouse To: Thomas Gleixner Cc: 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, gnomes@lxorguk.ukuu.org.uk, ashok.raj@intel.com, mingo@kernel.org In-Reply-To: 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> Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAG1BMVEUHBwcUFBQpKSlGRkZhYWF9fX2Xl5eysrLMzMxFF+rXAAACaElEQVQ4y21UQXbbIBQE9wJALmAg6ToWON22FrhZthHgbvssUPathC7QWMful2JHSmtWwGg+zPxBCE0DU4QoJQgRgsg4w2gJjBNE8PjFBZgnQMBs+uZ1NQNQjZO3BV4AGDFC0f+l4DBG0VUAM4yv7SO8IgRdHXQ+A78HKL5OAeCfNQV5cHX8DsBUyIJKtYbt98BKaGNCKjfgFVkqYVLbkHKsRsbSCSa0T6npIqLrpRBgQKHUpQmgs9eEKaiUcooE8WWfCGVnBiUcn1uF2XhbfmN9apKnmMP2K4kizKkQWxuaVNOpU2cACIyxO1Po8ETHcXEDMVnozcejkAYA9iaD4pU0ZvNQ8VurNnTuFAYVtuIPUZW25PjDIjQAlGyffIiRQxoWAZBmJ0LTdW2Nyc0iP3DqRhxizvGJkBWZmyFVyZkddWzmBoIBVMpCCJ1CFzl98xav4VJKSSD45KbUT75ixikTphDSRh8+Uz7JLgUTAgAFwzqzjxc/nDY7WUApqY0OMdTwCKZSXplSKkgIRCHElCp8ZnhnKqXuwcNbk1L0VXE+I9alUXoHlLHl3mv7/dWQlJwtjREC7mu9L/U2jQyMUuO2EDS4q9Kl2ddm232bxIE5pjJuVwiljNn/Cfv25/T0cu5cZbwHGVq7h/zp0B4n3S99V/utD+Uo8BiGx9xCsOAV5z7/tjo4Z4z1Lvb90KZ7eFOoOeXOukqF2seo234YYuaQPpRP+cVZU5adT1Edun5Iz3z8fTz3+eSDh0Ip1c7zx1MaijGzTd/3MbRuBHz8cvcVgCMBRpOHvgu59WDhoat+nIZm+LWm9C/aaaGq5DCP9QAAAABJRU5ErkJggg== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-vy+kP3pRhp5nnpvmtHhx" Date: Thu, 25 Jan 2018 11:20:13 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-vy+kP3pRhp5nnpvmtHhx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 11:54 +0100, Thomas Gleixner wrote: > On Thu, 25 Jan 2018, David Woodhouse wrote: >=20 > >=20 > > On Thu, 2018-01-25 at 09:23 +0000, David Woodhouse wrote: > > >=20 > > >=20 > > > +/* > > > + * Early microcode releases for the Spectre v2 mitigation were broke= n. > > > + * Information taken from; > > > + * =E2=80=A2 https://newsroom.intel.com/wp-content/uploads/sites/11/= 2018/01/microcode-update-guidance.pdf > > Oh look, Intel have released a *third* version of that document > > already, and they've bumped the bad Kabylake versions to 0x84, although > > they're *still* missing out the KBL 906EA SKU which was updated to 0x80 > > in the public 20180108 microcode release. I'll bump them all in my tree > > to 0x84. > >=20 > > Thomas, want another copy in email now, or were we waiting for another > > round of these before you merge them anyway? > Looking at this mess makes me even less convinced that a blacklist is a > good idea. We have already at least 3 different variants of blacklists. >=20 > So I rather see a whitelist approach which says: >=20 > =C2=A0=C2=A0=C2=A0if (ucode_version < known_good(family, model)) > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0return; >=20 > I know it would require that Intel releases a set of known good ucodes at > some point in the future, but that's a reasonable request. >=20 > I rather take a few patches which add the cutoff for family/model (and NO= , > I don't want to add stepping into the mix at all) than having this > blacklist mess which keeps changing every other day. I don't know why they added KBL 0x84 microcode; I'm not aware that it's been released. Maybe it escaped somewhere so that's why they added it to the doc. If they ship another bad microcode revision to the public, newer than the ones which are already in that list, then there is something *SEVERELY* wrong. Wronger than we already know. And if we take this 'piecemeal whitelist' approach, they're going to have to add the newly-released microcodes to the kernel each time they do a release which covers a new SKU =E2=80=94 so it's not like it'll even h= elp, because if they *do* ship another bad one, we'll *already* have added it to the kernel by the time we realise. I don't expect them to *keep* doing daily releases of the blacklist doc; it's just been a bit rushed, that's all. I think we're much better off doing it this way than saying that we'll keep taking incremental updates as they do new releases. Also, I don't think we can avoid looking at the stepping. Not unless you want to make Intel synchronise the microcode version numbers for different steppings of the same model? 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