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=-2.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, PDS_BAD_THREAD_QP_64,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 A8838C48BE8 for ; Wed, 16 Jun 2021 00:02:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8913F6008E for ; Wed, 16 Jun 2021 00:02:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231478AbhFPAFB (ORCPT ); Tue, 15 Jun 2021 20:05:01 -0400 Received: from mga05.intel.com ([192.55.52.43]:16211 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229811AbhFPAFA (ORCPT ); Tue, 15 Jun 2021 20:05:00 -0400 IronPort-SDR: xaNVv+osq1ONl1k/sn+JuVqALszLi/4otbkjLu9N1cjNKt2kn/ZYIK+tZujZIH+kwbPEXS187z om05wSvkxSAQ== X-IronPort-AV: E=McAfee;i="6200,9189,10016"; a="291720298" X-IronPort-AV: E=Sophos;i="5.83,276,1616482800"; d="scan'208";a="291720298" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Jun 2021 17:02:55 -0700 IronPort-SDR: iG598vUl0++JcPL0AY6F7Wy4zxfWbG5QD/ePyblkkDHHMOFmfHmrEkYprxNEwtpNQQzs94ozXF zWJ2DiBK+y9Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,276,1616482800"; d="scan'208";a="637280631" Received: from fmsmsx604.amr.corp.intel.com ([10.18.126.84]) by fmsmga006.fm.intel.com with ESMTP; 15 Jun 2021 17:02:55 -0700 Received: from fmsmsx611.amr.corp.intel.com (10.18.126.91) by fmsmsx604.amr.corp.intel.com (10.18.126.84) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Tue, 15 Jun 2021 17:02:54 -0700 Received: from fmsmsx606.amr.corp.intel.com (10.18.126.86) by fmsmsx611.amr.corp.intel.com (10.18.126.91) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Tue, 15 Jun 2021 17:02:53 -0700 Received: from fmsedg602.ED.cps.intel.com (10.1.192.136) by fmsmsx606.amr.corp.intel.com (10.18.126.86) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4 via Frontend Transport; Tue, 15 Jun 2021 17:02:53 -0700 Received: from NAM10-BN7-obe.outbound.protection.outlook.com (104.47.70.109) by edgegateway.intel.com (192.55.55.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2242.4; Tue, 15 Jun 2021 17:02:53 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=jo4Dc036XyV/hICLhecXCTb9jQzaAhSZCb7OpRt47qmZi3EqyfE3KpEVfB2NpxZg5D+AJ3c/SBA2/3km/3u920xi7i836B0Atvp1vCuOPR3Y+ONRCZt3ezFdCHkH9FK6Qt1/X+XsQJvTOSAHL20BIINA825EvvIDyR+uqn1d38HFfX0xUNI8GrVGmVJZ2xQ+TVbl+X2A9A0SYDp/h7xMvndDQF++vWMYzxKGWVlsDtJzeocEZYtfAykpVuL1njEVSVvY36mBfh1inznIzFtmzPNjjDdRTZqYF0/M31ScsYp0xF7d5jAYARZ+E9lgCS9IG15uucSulWDVEo04UMPcNw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=j68gUsh6pnpYP72F3/d0rfG91gYp2ftLCCIwUDeP790=; b=joLFUvUsbTutQXuQHZOWPrcDikD1PIJrF68d21Ydze6a6zYGuVfufluHD7+iPVOItM46uRx2moFY+44ssG+ccxzwlHqp5jWJUGwcM+GCpbY5flpY8Ccg/1yOvjIf/pf8BHpbwQhr9KUpexO074/qt8gp+FXD8j/m9Q0qt7ok5ag8DY406eY3n1O0yKJoL09SvMHd5wimfCEbzMxI+qSUjXVJJRIjUYekzD4toXJcTNhmb7ytNNF4inBJuVOO82rsplFu5gwl5ZT6dejGS/9nizGYWgsJXnOJKW7WKamKpl8i4uMcMFQ7KWR7BZjOmsrgocfaqmX5N0ALACCacamKEA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=intel.onmicrosoft.com; s=selector2-intel-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=j68gUsh6pnpYP72F3/d0rfG91gYp2ftLCCIwUDeP790=; b=gQflc6N/a1sGx0xRtDzhTduxkJjZvjbLZPgI/bH+8O2FXk2DQmmYChMD/T8OPHjVkv1ogZDN9kLI89qW3fzBRoKRzV5EpH2Lx6Z4HXeZct55i44hUVuUbOMSu8UzZN+BvHQoKYLIHWFRhIdoA8vmsfM0IxpuAZLDN/5VAOXM6TE= Received: from MWHPR11MB1886.namprd11.prod.outlook.com (2603:10b6:300:110::9) by MWHPR1101MB2128.namprd11.prod.outlook.com (2603:10b6:301:55::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.24; Wed, 16 Jun 2021 00:02:20 +0000 Received: from MWHPR11MB1886.namprd11.prod.outlook.com ([fe80::6597:eb05:c507:c6c1]) by MWHPR11MB1886.namprd11.prod.outlook.com ([fe80::6597:eb05:c507:c6c1%12]) with mapi id 15.20.4219.025; Wed, 16 Jun 2021 00:02:19 +0000 From: "Tian, Kevin" To: Jason Gunthorpe CC: Jean-Philippe Brucker , "Alex Williamson (alex.williamson@redhat.com)" , "Raj, Ashok" , "kvm@vger.kernel.org" , "Jonathan Corbet" , Robin Murphy , LKML , Kirti Wankhede , "iommu@lists.linux-foundation.org" , "David Gibson" , "Jiang, Dave" , David Woodhouse , Jason Wang Subject: RE: [RFC] /dev/ioasid uAPI proposal Thread-Topic: [RFC] /dev/ioasid uAPI proposal Thread-Index: AddSzQ97BhCb3gd8AUyldaDZ6yOMNABTUTCAAQiuDaAADwOFgAJSmyVgAA0fjwAAEFKEEAAASwWAAAAgcXAAATmRgAAAC9RgAACZuQAAAAd+oA== Date: Wed, 16 Jun 2021 00:02:19 +0000 Message-ID: References: <20210528233649.GB3816344@nvidia.com> <20210603130519.GY1002214@nvidia.com> <20210615150630.GS1002214@nvidia.com> <20210615230215.GA1002214@nvidia.com> <20210615234057.GC1002214@nvidia.com> <20210615235928.GD1002214@nvidia.com> In-Reply-To: <20210615235928.GD1002214@nvidia.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-version: 11.5.1.3 dlp-product: dlpe-windows dlp-reaction: no-action authentication-results: nvidia.com; dkim=none (message not signed) header.d=none;nvidia.com; dmarc=none action=none header.from=intel.com; x-originating-ip: [101.80.71.101] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 2a6a79d6-ea2a-479e-d5a9-08d9305a026d x-ms-traffictypediagnostic: MWHPR1101MB2128: x-ld-processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6430; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MWHPR11MB1886.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(346002)(366004)(396003)(39860400002)(136003)(376002)(5660300002)(52536014)(76116006)(9686003)(66946007)(66476007)(55016002)(478600001)(38100700002)(64756008)(122000001)(66556008)(66446008)(6506007)(316002)(2906002)(7696005)(4326008)(33656002)(26005)(8676002)(71200400001)(86362001)(6916009)(54906003)(7416002)(8936002)(186003);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata-chunkcount: 1 x-ms-exchange-antispam-messagedata-0: =?us-ascii?Q?x/JVhxiaCNFDsBzN3ZEjVHF7yjKJZ3iS42S/aDQLGwkkug/ymnvg/OOkM1Af?= =?us-ascii?Q?YmBDXtYofF0McXCXtTqhd/pcTnbI74lKnZmcso8bBVXY8lml4ECJOXdw9G9P?= =?us-ascii?Q?ppbjWJ+NnwMnOwF+PlBBrJCNLtOyQHhSu9kDx7W/VM/gqpuA2up4BTSu7Q5t?= =?us-ascii?Q?agS62DOhijXFEm9xB380j/Eu6pE6spJ95L1YryXsGPiXm0vTN9TADJiZ7gRE?= =?us-ascii?Q?CTsupo+r4Tjffy62sv+8v4zDG4oE0eICnKxOaMJ+1zl45xR0FLyVM0d5lZs+?= =?us-ascii?Q?wyjxZmZPYViWGBKjalcBU1Jv4FiJQ6rZ75DxrUy9qF7CK92k0HCW3KcaT5x/?= =?us-ascii?Q?8KxmzZKx07jSIn7/Bo+kMycOg+1bObVYHzsx/lOEzoMzJI9IFP0kpYZRzZLe?= =?us-ascii?Q?5t7VCUJJ8ywIXz9XkBfVCbsNJ/y2bbM7TBPgGAMPKGd6jDMG8MCREuNbbeDX?= =?us-ascii?Q?IZKk1HHeBCbrVjckau257f2QYnS2w5S1HUgxjQtChY0J4npWd1qtj8QlYMjy?= =?us-ascii?Q?WCuF4htgjc0qoZdyBWtriik0OtuyufxgyD9/BOaOVMvlO5pmqxTotJhPeXcL?= =?us-ascii?Q?OTZq12iciVUoypeCT+NZKXRRzebToNUhww36SerIxRyPyYXd9J91Y0qkJtGH?= =?us-ascii?Q?0fDoGv1dWGpXHwtf7GAR6ZlJVThiz01CR+l9A0f6YVXKPDAvDAJONv/xN8Eq?= =?us-ascii?Q?b8RmQz20LswefYBHkojstQ/FlzXLjRZJIho/U2EHGLiE1kMqTcTZn4jNfhQP?= =?us-ascii?Q?n963Lk1VqBbahYRmWVgnsvKQW70GZ/IcxMb2/oAi8zdyCqdHiMopX3DnScDh?= =?us-ascii?Q?adfRpNFXe4cNrIEV+nCq7+5ciRc4vPd9Xr+g2FPpcUpbrJdCFdD8pvkiEQ9J?= =?us-ascii?Q?51UzLqWZPYbeZtReJqXgmx8KIqKC8nqjFbjVnqlGZ8G9qBNiLKI+HjQGCN56?= =?us-ascii?Q?DT4Skf3b1a0Zl9qX3krPwVdf8DD2w0uY15fFj5XMgXlcvP/MsyelVOpjOVhD?= =?us-ascii?Q?zthUgrEQ6huoKPulEeLrC53XTVF4/bht2/UyLc/b5XapZHb3DDR2NDePM/Ro?= =?us-ascii?Q?H+bLBSJCdWh+6/FEvEwEdyiugznswF3PsGaTlYI5ivNPixnzTBF0XpVMj1HG?= =?us-ascii?Q?TKhz/rwremSnx47dUtHRqPP4VHidwrpP/TPRXZSZUOd/3POfvDhMPPN1D/sQ?= =?us-ascii?Q?J430hiBETkjHjd8eB06sW1J6bUQPi5VnFbUnUmwJzgFXCxO0cheoL+Jd+A3C?= =?us-ascii?Q?4MdEjRDvmH0oINUHaj2hEkOMnyTqT7UUw+IR4ukDqHzQDAnS6WIe2wl0bkud?= =?us-ascii?Q?0Dd6SspJhAI5RzbuiSdSHPFi?= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MWHPR11MB1886.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2a6a79d6-ea2a-479e-d5a9-08d9305a026d X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Jun 2021 00:02:19.5158 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: hH48+eHxUiYbhaAs583sUrS3ygZq+Ds6UhbmxjLyN5lUOWQLQaR4xVfQWobN/ihB4bzhyNefDEENyuJAZrtaIg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1101MB2128 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > From: Jason Gunthorpe > Sent: Wednesday, June 16, 2021 7:59 AM >=20 > On Tue, Jun 15, 2021 at 11:56:28PM +0000, Tian, Kevin wrote: > > > From: Jason Gunthorpe > > > Sent: Wednesday, June 16, 2021 7:41 AM > > > > > > On Tue, Jun 15, 2021 at 11:09:37PM +0000, Tian, Kevin wrote: > > > > > > > which information can you elaborate? This is the area which I'm not > > > > familiar with thus would appreciate if you can help explain how thi= s > > > > bus specific information is utilized within the attach function or > > > > sometime later. > > > > > > This is the idea that the device driver needs to specify which bus > > > specific protocol it uses to issue DMA's when it attaches itself to a= n > > > IOASID. For PCI: > > > > What about defining some general attributes instead of asking iommu > > fd to understand those bus specific detail? >=20 > I prefer the API be very clear and intent driven, otherwise things > just get confused. >=20 > The whole WBINVD/no-snoop discussion I think is proof of that :\ >=20 > > from iommu p.o.v there is no difference from last one. In v2 the device > > driver just needs to communicate the PASID virtualization policy at > > device binding time, >=20 > I want it documented in the kernel source WTF is happening, because > otherwise we are going to be completely lost in a few years. And your > RFC did have device driver specific differences here >=20 > > > The device knows what it is going to do, we need to convey that to th= e > > > IOMMU layer so it is prepared properly. > > > > Yes, but it's not necessarily to have iommu fd understand bus specific > > attributes. In the end when /dev/iommu uAPI calls iommu layer interface= , > > it's all bus agnostic. >=20 > Why not? Just put some inline wrappers to translate the bus specific > language to your generic language if that is what makes the most > sense. >=20 I can do this. Thanks