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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 517EAC433EF for ; Tue, 5 Jul 2022 18:54:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231971AbiGESyO (ORCPT ); Tue, 5 Jul 2022 14:54:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232380AbiGESyK (ORCPT ); Tue, 5 Jul 2022 14:54:10 -0400 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7B42E1ADB4 for ; Tue, 5 Jul 2022 11:54:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1657047248; x=1688583248; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=bM0ABJX0qGEyGQRZ6VO/v3KuV7TXXVDZ98ArQud1930=; b=Pf8XHU9e3KMVnEkKitLEpcONpREWJutbFdVtRmQm//lTj7hNRe7grZ07 kFCo4xPcglnFAOdIbCIO8mCMq0+NM4IVayClHrC/qZq4Enk1sfuxl5geB B0bF6Akf7N5bd75vPkkYrgnn/BeeWDOdmCPFd6hHxr6JMCUr3MC9Gm0k9 XXTUWQdv8JoGDkncLv6zPXsUqugMx8eJ18g1wfVvghnZPp8I9rYxx9m8x XTi/1bGkvBMvUho5W1CyKx+p/jp/tXharrP2FOpD3JITT+ekvzkEJtD8l S+olUjd5I3Ep9w7zrV3xN2YHYahVSGF42qLZUQ6lRpvrocjPmSnMJKEoW g==; X-IronPort-AV: E=McAfee;i="6400,9594,10399"; a="284180221" X-IronPort-AV: E=Sophos;i="5.92,247,1650956400"; d="scan'208";a="284180221" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2022 11:54:08 -0700 X-IronPort-AV: E=Sophos;i="5.92,247,1650956400"; d="scan'208";a="839237437" Received: from tdisanx-mobl.amr.corp.intel.com (HELO [10.209.16.32]) ([10.209.16.32]) by fmsmga006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Jul 2022 11:54:08 -0700 Message-ID: <8b6f3f9f-71c8-2b6f-20a3-5e9c259a1b9a@intel.com> Date: Tue, 5 Jul 2022 11:52:10 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.9.1 Subject: Re: [PATCH v8 1/5] x86/tdx: Add TDX Guest attestation interface driver Content-Language: en-US To: Sathyanarayanan Kuppuswamy , Kai Huang , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org Cc: "H . Peter Anvin" , "Kirill A . Shutemov" , Tony Luck , Andi Kleen , Wander Lairson Costa , Isaku Yamahata , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.com, linux-kernel@vger.kernel.org References: <20220609025220.2615197-1-sathyanarayanan.kuppuswamy@linux.intel.com> <20220609025220.2615197-2-sathyanarayanan.kuppuswamy@linux.intel.com> <0f6bedbb-14cc-bf93-5d9f-bfd2c49dc7b2@intel.com> <48b9d807-2d9e-016f-bada-906911d6ecb0@linux.intel.com> <331abea18e728061979301772a9d0d61543f59fb.camel@intel.com> <0b5884b8-9240-63b2-ca4c-20c86fd2e8c1@linux.intel.com> From: Dave Hansen In-Reply-To: <0b5884b8-9240-63b2-ca4c-20c86fd2e8c1@linux.intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 7/5/22 11:45, Sathyanarayanan Kuppuswamy wrote: > Yes, there are many ways to design this. But I still think IOCTL is a better fit > for the request/response kind of use case. Are there any other similar ABIs in the kernel? What kind of mechanism do they use?