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[209.132.180.67]) by mx.google.com with ESMTP id h8si4738994pfi.354.2018.01.25.08.37.16; Thu, 25 Jan 2018 08:37:31 -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=LtTjNX3t; 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 S1751386AbeAYQfX (ORCPT + 99 others); Thu, 25 Jan 2018 11:35:23 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:55450 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751114AbeAYQfV (ORCPT ); Thu, 25 Jan 2018 11:35:21 -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=YeX7k7bOFwTQI44i3SAZCtSpbDw7qDhZmQMVWzpHgE8=; b=LtTjNX3tXv4uHjEwBJxsyJLDa TNBCbQx1R7WVBxS9+R7Etq4l/1c0+nvQwik3phqWgz8wF7Rk839lFP46G205rq8R6/S0B7LC1ETir NUS75hwORclnEH4M0r4QbHyPX/5XHrDG9sTxyOMsp1RdODGDfE/aXF0r7+dxkXpUvk8VBPeLlTY1q Ze+kzxG+2MB9biN+RMgfgEoC+09GaBHheJPfKLBffKJ/LTT+4wzGPxajAvA7zGj1f2E5+OIzi2hqO TypyiNXTh3aBXPdEtfSFj1IfBkzY/GyWrNbZk1QqudDYKOgRFqHLZl84eeBRar1Cy2HhCffVRx5fz mcAfbos4Q==; Received: from [2001:8b0:10b:1:88df:f864:4b91:a1c5] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eekUS-0005lV-MT; Thu, 25 Jan 2018 16:35:04 +0000 Message-ID: <1516898104.30244.143.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 , Alan Cox 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, 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> <1516879213.30244.74.camel@infradead.org> <1516887714.30244.121.camel@infradead.org> <20180125161547.33e63bb3@alans-desktop> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-jNCo62BOUySBaQJIzuFE" Date: Thu, 25 Jan 2018 16:35:04 +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 --=-jNCo62BOUySBaQJIzuFE Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 17:24 +0100, Thomas Gleixner wrote: > On Thu, 25 Jan 2018, Alan Cox wrote: >=20 > >=20 > > >=20 > > > 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. > >=20 > > I am happy with patch 5 and I think for 64bit we are probably done for > > the mainstream. VIA/Centaur data would be nice. Thanks. > > 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. I don't think telling them to upgrade to a specific revision is needed. If they get a 'bad microcode' message they should update to whatever is the latest. As for "slightly higher risk of crashes or insecure"... that's a valid concern *but* remember we're using retpoline to make the kernel secure, and we haven't even merged the patches yet which do IBPB on context switch or IBRS on calling into firmware or any of the other lower- priority things. I have yet to see a viable proof-of-concept for any of the holes which remain. So I think we *can* probably live without the microcode features for now. In particular I *don't* want to be exposing them to VM guests, so that VM guests can take the system down by bashing on them. If you want to add a command-line option to ignore the blacklist and allow the features to be used, I *suppose* I could tolerate that. 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