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[209.132.180.67]) by mx.google.com with ESMTP id a3-v6si1635811plc.552.2018.01.29.12.17.40; Mon, 29 Jan 2018 12:17:54 -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=pzvZopte; 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 S932492AbeA2URS (ORCPT + 99 others); Mon, 29 Jan 2018 15:17:18 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:48156 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932491AbeA2URO (ORCPT ); Mon, 29 Jan 2018 15:17:14 -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=+qb6tGRYQErKYrwJOLnkYwofNeEa8hjxJmriZc/NrzI=; b=pzvZopteBB4boCMuBJGyxbnXk 4PE0oQqxgnravJr/nLTzl+lClieBYhShqV73ciHC5+9hlP19XdmEcotV1f6hGMD53ZFjCqbYOnVUp HMZ5xtGGe2+WTr5IkVa1wHt1bsiPufBAyzGDgNsFv/Cl3g1/u4YsiLKpuGxUnNrrcihxM1zJRXKOs UxzVU/VnUvusWnEKtwPKQPPcZj1vk74lXxob2r5JygliVODLCc8xJAggy3kvLW2WEI7+/KUKsi++k OyqHThNhB3evwZ6h7EqMzrbrLE9p5C3Si5zdYD6zKN1/ehXyiSP9KuQt/afN9v9epm3806W8Lj8wo QtjUkiy7A==; Received: from [2001:8b0:10b:1:bc76:bf3c:69ce:9939] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1egFrT-0002eK-3G; Mon, 29 Jan 2018 20:17:03 +0000 Message-ID: <1517257022.18619.30.camel@infradead.org> Subject: Re: [RFC,05/10] x86/speculation: Add basic IBRS support infrastructure From: David Woodhouse To: Eduardo Habkost , KarimAllah Ahmed Cc: linux-kernel@vger.kernel.org, Andi Kleen , Andrea Arcangeli , Andy Lutomirski , Arjan van de Ven , Ashok Raj , Asit Mallick , Borislav Petkov , Dan Williams , Dave Hansen , Greg Kroah-Hartman , "H . Peter Anvin" , Ingo Molnar , Janakarajan Natarajan , Joerg Roedel , Jun Nakajima , Laura Abbott , Linus Torvalds , Masami Hiramatsu , Paolo Bonzini , Peter Zijlstra , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Thomas Gleixner , Tim Chen , Tom Lendacky , kvm@vger.kernel.org, x86@kernel.org In-Reply-To: <20180129201404.GA1588@localhost.localdomain> References: <1516476182-5153-6-git-send-email-karahmed@amazon.de> <20180129201404.GA1588@localhost.localdomain> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-9eaZcn6fomKofN91l1Ds" Date: Mon, 29 Jan 2018 20:17:02 +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 --=-9eaZcn6fomKofN91l1Ds Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-01-29 at 18:14 -0200, Eduardo Habkost wrote: >=20 > Sorry for being confused here, as probably the answer is buried > on a LKML thread somewhere.=C2=A0 The comment explains what the code > does, but not why.=C2=A0 Why exactly IBRS is preferred on Skylake? >=20 > I'm asking this because I would like to understand the risks > involved when running under a hypervisor exposing CPUID data that > don't match the host CPU.=C2=A0 e.g.: what happens if a VM is migrated > from a Broadwell host to a Skylake host? https://lkml.org/lkml/2018/1/22/598=C2=A0should cover most of that, I think= . --=-9eaZcn6fomKofN91l1Ds Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; 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