Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934236AbeAJO4Q (ORCPT + 1 other); Wed, 10 Jan 2018 09:56:16 -0500 Received: from smtp-fw-9102.amazon.com ([207.171.184.29]:34444 "EHLO smtp-fw-9102.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933639AbeAJO4N (ORCPT ); Wed, 10 Jan 2018 09:56:13 -0500 X-Amazon-filename: smime.p7s X-IronPort-AV: E=Sophos;i="5.46,340,1511827200"; d="p7s'?scan'208";a="585398824" Message-ID: <1515595594.22302.170.camel@amazon.co.uk> Subject: Re: [PATCH v3 3/3] x86/retpoline: Convert generic specific retpolines to use RETPOLINE_GENERIC To: Tom Lendacky , "tglx@linutronix.de" , "andi@firstfloor.org" CC: "linux-kernel@vger.kernel.org" , "peterz@infradead.org" , "tim.c.chen@linux.intel.com" , "torvalds@linux-foundation.org" , "ak@linux.intel.com" , "x86@kernel.org" , "pjt@google.com" , "luto@kernel.org" , "dave.hansen@intel.com" , "jikos@kernel.org" , "gregkh@linux-foundation.org" In-Reply-To: References: <20180110022831.29826-1-andi@firstfloor.org> <20180110022831.29826-4-andi@firstfloor.org> <1515590133.22302.148.camel@amazon.co.uk> Face: 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 Organization: Amazon Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-aJmaVwzQQDLtkAC/+qHe" Date: Wed, 10 Jan 2018 14:46:34 +0000 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 MIME-Version: 1.0 From: "Woodhouse, David" X-Evolution-Source: 1481217574.17989.4@uc8d3ff76b9bc5848a9cc Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: --=-aJmaVwzQQDLtkAC/+qHe Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-01-10 at 08:23 -0600, Tom Lendacky wrote: > On 1/10/2018 7:15 AM, Woodhouse, David wrote: > > On Tue, 2018-01-09 at 18:28 -0800, Andi Kleen wrote: > >> From: Andi Kleen > >> > >> X86_FEATURE_RETPOLINE has been renamed to X86_FEATURE_RETPOLINE_GENERI= C. > >> Convert the sequences using it. > >=C2=A0 > > AMD documentation says they need the RSB fill too, so these should stay > > under X86_FEATURE_RETPOLINE I think. >=20 > AMD processors don't fall back to the indirect predictor on an underflow > so this isn't needed on AMD if it is purely for underflow prevention. It isn't purely for underflow protection. This is needed (see the AMD doc) for protecting against RSB entries that actually point to userspace addresses. 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