Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752937AbeAJW5j (ORCPT + 1 other); Wed, 10 Jan 2018 17:57:39 -0500 Received: from smtp-fw-33001.amazon.com ([207.171.190.10]:49774 "EHLO smtp-fw-33001.amazon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751956AbeAJW5i (ORCPT ); Wed, 10 Jan 2018 17:57:38 -0500 X-Amazon-filename: smime.p7s X-IronPort-AV: E=Sophos;i="5.46,342,1511827200"; d="p7s'?scan'208";a="714802854" Message-ID: <1515624823.22302.260.camel@amazon.co.uk> Subject: Re: tip/master falls off NOP cliff with KPTI under KVM To: Alexey Dobriyan , , , , , , CC: , , , In-Reply-To: <20180110223457.GA1762@avx2> References: <20180110220814.GA29262@avx2> <20180110223457.GA1762@avx2> Face: 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 Organization: Amazon Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-zNZJ2Rg2NwFBdX5NyCWp" Date: Wed, 10 Jan 2018 22:53:43 +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: --=-zNZJ2Rg2NwFBdX5NyCWp Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-11 at 01:34 +0300, Alexey Dobriyan wrote: >=20 > Bisection points to >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f3433c1010c6af61c9897f0f0= 447f81b991feac1 is the first bad commit > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0commit f3433c1010c6af61c9= 897f0f0447f81b991feac1 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Author: David Woodhouse <= dwmw@amazon.co.uk> > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Date:=C2=A0=C2=A0 Tue Jan= 9 14:43:11 2018 +0000 >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 x86/re= tpoline/entry: Convert entry assembler indirect jumps Thanks. We've fixed the underlying problem with the alternatives mechanism, *and* changed the retpoline code not to actually rely on said fix. > RETPOLINE is enabled but build system is reporting that compiler doesn't > support it (Gentoo 6.4.0 p1.1) >=20 > Disabling CONFIG_RETPOLINE fixes boot. >=20 > And build system reports that "system may be insecure" even if RETPOLINE > is disabled. That's odd. 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