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=-5.3 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 DE067C433DB for ; Tue, 16 Feb 2021 15:19:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AB93C64E0F for ; Tue, 16 Feb 2021 15:19:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229784AbhBPPTO (ORCPT ); Tue, 16 Feb 2021 10:19:14 -0500 Received: from mga14.intel.com ([192.55.52.115]:58179 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229628AbhBPPTN (ORCPT ); Tue, 16 Feb 2021 10:19:13 -0500 IronPort-SDR: tSCeREF9iMgjeWiB7n4q1aAZz4TJ9X/VuRDJygE8xLbl9E1fwFEK6ZGdFgQNfd8K6UN6X401vd s8EXyuzXFeXw== X-IronPort-AV: E=McAfee;i="6000,8403,9896"; a="182131785" X-IronPort-AV: E=Sophos;i="5.81,183,1610438400"; d="scan'208";a="182131785" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2021 07:18:31 -0800 IronPort-SDR: P44OxlNA6bTrbzPpxzCbMi5ptV3ghmFs6HvoK8qeTQoVogrFcRXm/dap2kwQLsDaRSnPZM+XM5 3cGmisL5WMBA== X-IronPort-AV: E=Sophos;i="5.81,183,1610438400"; d="scan'208";a="589233492" Received: from twblanch-mobl.amr.corp.intel.com (HELO [10.209.156.22]) ([10.209.156.22]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Feb 2021 07:18:29 -0800 Subject: Re: [RFC PATCH v5 08/26] x86/sgx: Expose SGX architectural definitions to the kernel To: Borislav Petkov , "Huang, Kai" Cc: Jarkko Sakkinen , "linux-sgx@vger.kernel.org" , "kvm@vger.kernel.org" , "x86@kernel.org" , "seanjc@google.com" , "luto@kernel.org" , "Edgecombe, Rick P" , "Huang, Haitao" , "pbonzini@redhat.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "hpa@zytor.com" References: <1d6fe6bd392b604091b57842c15cc5460aa92593.1613221549.git.kai.huang@intel.com> <20210216103218.GB10592@zn.tnic> <20210216114851.GD10592@zn.tnic> From: Dave Hansen Autocrypt: addr=dave.hansen@intel.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210216114851.GD10592@zn.tnic> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org On 2/16/21 3:48 AM, Borislav Petkov wrote: > What I'm trying to point you at is, to not give some artificial reasons > why the headers should be separate - artificial as the SDM says it > is architectural and so on - but give a reason from software design > perspective why the separation is needed: better build times, less > symbols exposed to modules, blabla and so on. I think I actually suggested this sgx_arch.h split for SGX in the first place. I was reading the patches and I had a really hard time separating the hardware and software structures. There would be a 'struct sgx_foo {}' and some chit chat about what it did... and I still had no idea if it was an architectural structure or not. This way, it's 100% crystal clear what Linux is defining and what the hardware defines from the diff context.