From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5FF89ECE561 for ; Fri, 14 Sep 2018 21:21:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E41A121476 for ; Fri, 14 Sep 2018 21:21:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E41A121476 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728286AbeIOChz (ORCPT ); Fri, 14 Sep 2018 22:37:55 -0400 Received: from mga14.intel.com ([192.55.52.115]:9165 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727762AbeIOChz (ORCPT ); Fri, 14 Sep 2018 22:37:55 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga103.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Sep 2018 14:21:41 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.53,374,1531810800"; d="scan'208";a="73321823" Received: from 2b52.sc.intel.com ([143.183.136.51]) by orsmga008.jf.intel.com with ESMTP; 14 Sep 2018 14:21:40 -0700 Message-ID: <1536959832.12990.34.camel@intel.com> Subject: Re: [RFC PATCH v3 05/24] Documentation/x86: Add CET description From: Yu-cheng Yu To: Pavel Machek Cc: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Peter Zijlstra , "Ravi V. Shankar" , Vedvyas Shanbhogue Date: Fri, 14 Sep 2018 14:17:12 -0700 In-Reply-To: <20180830203948.GB1936@amd> References: <20180830143904.3168-1-yu-cheng.yu@intel.com> <20180830143904.3168-6-yu-cheng.yu@intel.com> <20180830203948.GB1936@amd> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2018-08-30 at 22:39 +0200, Pavel Machek wrote: > Hi! > > > > > diff --git a/Documentation/admin-guide/kernel-parameters.txt > > b/Documentation/admin-guide/kernel-parameters.txt > > index 9871e649ffef..b090787188b4 100644 > > --- a/Documentation/admin-guide/kernel-parameters.txt > > +++ b/Documentation/admin-guide/kernel-parameters.txt > > @@ -2764,6 +2764,12 @@ > >   noexec=on: enable non-executable mappings (default) > >   noexec=off: disable non-executable mappings > >   > > + no_cet_ibt [X86-64] Disable indirect branch tracking for > > user-mode > > + applications > > + > > + no_cet_shstk [X86-64] Disable shadow stack support for user- > > mode > > + applications > Hmm, not too consistent with "nosmap" below. Would it make sense to > have cet=on/off/ibt/shstk instead? We also have noxsave, noxsaveopt, noxsaves, etc.  This style is more decisive? If "cet=" is preferred, we can change it later? Yu-cheng