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[209.132.180.67]) by mx.google.com with ESMTP id r22si2424950pfh.170.2018.02.02.13.18.41; Fri, 02 Feb 2018 13:18:56 -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=uaDRocl1; 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 S1752309AbeBBUbn (ORCPT + 99 others); Fri, 2 Feb 2018 15:31:43 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:51998 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752267AbeBBUbg (ORCPT ); Fri, 2 Feb 2018 15:31:36 -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=LrrSxGh3HJ0Ng/kDAjMHwkYAC5a3vIHJXJYK3dUhgvs=; b=uaDRocl1I8Ibzu+Ra3l3+RsgC xtRFDmnQEL3Fm2deOoSY3IXYeykyG+dD38YqRQA9pQmYUs0D3NzkvMOyCVu6d370ZGN4oegtZ86Zb uGrhfQ/85YtSaq8CalCGTxeBTO9Bd7ffrjuIVnTDHwDmDx0HeSDaUHgYW8KUqAOkC8tVtqzQyrGb9 X1c0FWx2UUc6DsW4Xnjgqzo7x6fbCf9Ztn+9YL+j8/hUIdMoYy2gY6g3pt/nudHwnENRlGBuOU9AU CiE8wBcgK9iJGwLmLU5OM/FthgncZpXf73wnW7EGaqxB19flVKmFBE8pa9fGX3NxFNdbg2dGh+u4B NrlHARulw==; Received: from [2001:8b0:10b:1:d1d9:ea07:dbdf:a8a4] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1ehhzb-0006hT-Lw; Fri, 02 Feb 2018 20:31:27 +0000 Message-ID: <1517603487.31953.76.camel@infradead.org> Subject: Re: [PATCH v6 2/5] KVM: x86: Add IBPB support From: David Woodhouse To: Konrad Rzeszutek Wilk Cc: KarimAllah Ahmed , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, Ashok Raj , Asit Mallick , Dave Hansen , Arjan Van De Ven , Tim Chen , Linus Torvalds , Andrea Arcangeli , Andi Kleen , Thomas Gleixner , Dan Williams , Jun Nakajima , Andy Lutomirski , Greg KH , Paolo Bonzini , Peter Zijlstra In-Reply-To: <20180202202857.GI28192@char.us.oracle.com> References: <1517522386-18410-1-git-send-email-karahmed@amazon.de> <1517522386-18410-3-git-send-email-karahmed@amazon.de> <20180202174932.GR28192@char.us.oracle.com> <1517594544.31953.62.camel@infradead.org> <20180202195601.GD28192@char.us.oracle.com> <1517602575.31953.74.camel@infradead.org> <20180202202857.GI28192@char.us.oracle.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-EUq5vVOzHIeZYZuB8RKd" Date: Fri, 02 Feb 2018 20:31:27 +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 --=-EUq5vVOzHIeZYZuB8RKd Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-02-02 at 15:28 -0500, Konrad Rzeszutek Wilk wrote: >=20 > >=C2=A0 > > No. The AMD feature bits give us more fine-grained support for exposing > > IBPB or IBRS alone, so we expose those bits on Intel too. >=20 > But but.. that runs smack against the idea of exposing a platform that > is as close to emulating the real hardware as possible. >=20 > As in I would never expect an Intel CPU to expose the IBPB on the 0x8000_= 0008 > leaf. Hence KVM (nor any hypervisor) should not do it either. >=20 > Unless Intel is doing it? Did I miss a new spec update? 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