From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x2250AaPaUKKYi4T9iRrksJL7DNk5Va3ET4cM5CUz8b1n8xqOTfWKWrFHpy59t2CKgPdu4d/E ARC-Seal: i=1; a=rsa-sha256; t=1516879239; cv=none; d=google.com; s=arc-20160816; b=B3neuMh83AVV9E0pJDYXYvcuSoWQLOAGj/Le5ToSKeWxdGuuVsz4N+TAsSCiU30VPc 18v68JlmQkzeE76oFo+tT1cLpawPHuT2YbMWs4NKNBx4yNaM7mEN6VnJMD5riseF8YST C6WnXfUpA8TMVvOPnvyQF2glUjMsbel4HwT2QOGmdxewqOxTCgAhmVEkyf8qHTiRFJR1 ukU3hOwJ8/gz388T/fpy8VNh11zAEOtuZPQ1rRIgTd/AWkVPmw4lIuMUF5KA0xfyOLd7 rTsLoesXfTW9h8QLjtoAyLQDJLWHSKccQEVs7k7x+0KDEDbnC1IMtrw/4TYPevA79RQs kwOQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=guU1aqGmrzjLoynRGvOS3Fa4K1QhDY3Mjl2wasxdggA=; b=BHH7ORGzzueom9r5VCueIccbEGdYB8tPXyK4nKOjF/Old2hluL6MQt+q/CP9sE4CMs lPqlQjXixJiDNfPsbC1EpL7tm44h1J+YBFhFalXWLJrBHwwHZDlVr3ZudeqNvJnYHo+6 BeiLjn/pbEaiMGIayerKvbfVHMlq8YBDjc+hMGl/fiHoe5CfHL+K95DMO/v97of6UyMZ PwQqFgF/J+zjlGpOGCX/tG61V30b7Bzh/YFLyLyrlvSw5PqNGgy0B/qBLhDUM+gVjIDj LqE7aBm57+4eU3s0a5qHybFRW5LqBAY00xXZEhpmFCJsOEsp26JlSxxQMNuaidFIrfM6 5apg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=NyHq/6nT; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=NyHq/6nT; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org 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: 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 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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590555855308082400?= X-GMAIL-MSGID: =?utf-8?q?1590563163108559684?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-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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