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=-7.9 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 2E0E4C433E1 for ; Tue, 25 Aug 2020 23:34:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1570620782 for ; Tue, 25 Aug 2020 23:34:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726617AbgHYXec (ORCPT ); Tue, 25 Aug 2020 19:34:32 -0400 Received: from mga02.intel.com ([134.134.136.20]:9369 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726542AbgHYXec (ORCPT ); Tue, 25 Aug 2020 19:34:32 -0400 IronPort-SDR: ZN+OV2SFvIotG49YgGU8rrxns0mJE/9HDrfzzPoLzPJ86VEYrAYkKoruTmaknORLiEbgoKMCF5 vQvMny8PkGNQ== X-IronPort-AV: E=McAfee;i="6000,8403,9724"; a="143984475" X-IronPort-AV: E=Sophos;i="5.76,354,1592895600"; d="scan'208";a="143984475" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2020 16:34:29 -0700 IronPort-SDR: jDH1O40YY4lOk1YRVka2qfIczRRKbt6rlwfRgT/NIKrAOgYtq0SF7EEESuwd0piSxHaIIvjQiR Ag1HGEmIkTmw== X-IronPort-AV: E=Sophos;i="5.76,354,1592895600"; d="scan'208";a="336668677" Received: from yyu32-mobl1.amr.corp.intel.com (HELO [10.213.162.112]) ([10.213.162.112]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Aug 2020 16:34:28 -0700 Subject: Re: [PATCH v11 25/25] x86/cet/shstk: Add arch_prctl functions for shadow stack To: Dave Hansen , Andy Lutomirski Cc: X86 ML , "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , LKML , "open list:DOCUMENTATION" , Linux-MM , linux-arch , Linux API , Arnd Bergmann , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin , Weijiang Yang References: <20200825002540.3351-1-yu-cheng.yu@intel.com> <20200825002540.3351-26-yu-cheng.yu@intel.com> <2d253891-9393-44d0-35e0-4b9a2da23cec@intel.com> <086c73d8-9b06-f074-e315-9964eb666db9@intel.com> <73c2211f-8811-2d9f-1930-1c5035e6129c@intel.com> From: "Yu, Yu-cheng" Message-ID: Date: Tue, 25 Aug 2020 16:34:27 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-arch-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org On 8/25/2020 4:20 PM, Dave Hansen wrote: > On 8/25/20 2:04 PM, Yu, Yu-cheng wrote: >>>> I think this is more arch-specific.  Even if it becomes a new syscall, >>>> we still need to pass the same parameters. >>> >>> Right, but without the copying in and out of memory. >>> >> Linux-api is already on the Cc list.  Do we need to add more people to >> get some agreements for the syscall? > What kind of agreement are you looking for? I'd suggest just coding it > up and posting the patches. Adding syscalls really is really pretty > straightforward and isn't much code at all. > Sure, I will do that. Thanks, Yu-cheng