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[209.132.180.67]) by mx.google.com with ESMTP id c80si6697663pfb.182.2018.01.26.10.45.18; Fri, 26 Jan 2018 10:45:32 -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=UAUFw5db; 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 S1752530AbeAZSoM (ORCPT + 99 others); Fri, 26 Jan 2018 13:44:12 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:52150 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751545AbeAZSoK (ORCPT ); Fri, 26 Jan 2018 13:44:10 -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=cchqSTCMYykO1iVV4uoN6fCzA4zo6LzgE5urxL228ms=; b=UAUFw5dbgWmal6Ay3w46A6K7Z ujuqIbcBTgICB4fbgUGGvZ3P/nMgl8czZWv4xT/s9gmh246Uh4/6ld5zh2FlF7qsXyqsQi0X4Icou Ak8ffmWamIkfeD5LgtmDvNw0fBzPSK5/S2wpNtkCOFQ3Y/8WgM3RFzAz58tFG/+9OPFAm/m3NdhNA q3JdpdIWfezESvQgV+yYUrX1ZBo1DQiXmn201OUdGU8DuxqqbW6svjHtAOo+IlC2MOzOU7pGlSwTT 4pbnID+gp7iPTMUQo/pjhEKdfw4bDihJ7c4z0TnbQfqSCu0N5ndCXDJ2XXvkIF/GFAB+QPlQouu6C CfzklqAhQ==; Received: from [2001:8b0:10b:1:187c:ba1b:8d76:1103] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1ef8xu-0005kl-Bi; Fri, 26 Jan 2018 18:43:06 +0000 Message-ID: <1516992186.30244.268.camel@infradead.org> Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation From: David Woodhouse To: "Van De Ven, Arjan" , Arjan van de Ven , Andi Kleen , Linus Torvalds Cc: "Hansen, Dave" , Liran Alon , Laura Abbott , Andrew Lutomirski , Janakarajan Natarajan , Borislav Petkov , "Mallick, Asit K" , Radim =?ISO-8859-1?Q?Krcm=E1r?= , KarimAllah Ahmed , Peter Anvin , "Nakajima, Jun" , Ingo Molnar , the arch/x86 maintainers , "Raj, Ashok" , Tim Chen , Paolo Bonzini , Linux Kernel Mailing List , Peter Zijlstra , Thomas Gleixner , Greg Kroah-Hartman , Masami Hiramatsu , Tom Lendacky , "Williams, Dan J" , Joerg Roedel , Andrea Arcangeli , KVM list In-Reply-To: <0575AF4FD06DD142AD198903C74E1CC87A600FE7@ORSMSX103.amr.corp.intel.com> References: <7c0b0879-3448-43e4-8380-4708fc787113@default> <50c5d627-8975-184b-b50f-4cc02c5816c5@intel.com> <1516957886.30244.161.camel@infradead.org> <20180126175901.GL26209@tassilo.jf.intel.com> <1516990288.30244.253.camel@infradead.org> <07daf763-cd29-5d1c-1488-1fcb5b440347@linux.intel.com> <1516991212.30244.262.camel@infradead.org> <0575AF4FD06DD142AD198903C74E1CC87A600FE7@ORSMSX103.amr.corp.intel.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-LrPpREZ+VReRtDdudwvA" Date: Fri, 26 Jan 2018 18:43:06 +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 --=-LrPpREZ+VReRtDdudwvA Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-01-26 at 18:28 +0000, Van De Ven, Arjan wrote: > > As you know well, I mean "we think Intel's document is not > > correct". > > you asked before and even before you sent the email I confirmed to > you that the document is correct >=20 > I'm not sure what the point is to then question that again 15 minutes > later other than creating more noise. Apologies, I hadn't seen the comment on IRC. Sometimes the docs *don't* get it right, especially when they're released in a hurry as that one was. I note there's a *fourth* version of microcode-update-guidance.pdf available now, for example :) So it is useful that you have explicitly stated that for *this* specific concern, the document is in fact correct that SMEP saves us from BTB and RSB pollution, *despite* the empirical evidence that those structures only hold the low 31 bits. I'm going to get back to other things now, although I'm sure others may be very interested to reconcile the empirical evidence with what you say, and want to know *how* that can be the case. 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