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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,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 458D2C433E2 for ; Wed, 16 Sep 2020 14:45:13 +0000 (UTC) Received: from hemlock.osuosl.org (smtp2.osuosl.org [140.211.166.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B388E2224D for ; Wed, 16 Sep 2020 14:45:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="pZcPgCcT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B388E2224D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=iommu-bounces@lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by hemlock.osuosl.org (Postfix) with ESMTP id 4A84687388; Wed, 16 Sep 2020 14:45:12 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from hemlock.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xVlMSYHPOa0w; Wed, 16 Sep 2020 14:45:11 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [140.211.9.56]) by hemlock.osuosl.org (Postfix) with ESMTP id 2DCB486E2C; Wed, 16 Sep 2020 14:45:11 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 08385C0859; Wed, 16 Sep 2020 14:45:11 +0000 (UTC) Received: from whitealder.osuosl.org (smtp1.osuosl.org [140.211.166.138]) by lists.linuxfoundation.org (Postfix) with ESMTP id 7CAFCC0051 for ; Wed, 16 Sep 2020 14:45:09 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by whitealder.osuosl.org (Postfix) with ESMTP id 6AFD686BCB for ; Wed, 16 Sep 2020 14:45:09 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from whitealder.osuosl.org ([127.0.0.1]) by localhost (.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id M+cCtcsMCGTq for ; Wed, 16 Sep 2020 14:45:08 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from nat-hk.nvidia.com (nat-hk.nvidia.com [203.18.50.4]) by whitealder.osuosl.org (Postfix) with ESMTPS id D340686D1F for ; Wed, 16 Sep 2020 14:45:07 +0000 (UTC) Received: from hkpgpgate101.nvidia.com (Not Verified[10.18.92.9]) by nat-hk.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 16 Sep 2020 22:45:05 +0800 Received: from HKMAIL103.nvidia.com ([10.18.16.12]) by hkpgpgate101.nvidia.com (PGP Universal service); Wed, 16 Sep 2020 07:45:05 -0700 X-PGP-Universal: processed; by hkpgpgate101.nvidia.com on Wed, 16 Sep 2020 07:45:05 -0700 Received: from HKMAIL101.nvidia.com (10.18.16.10) by HKMAIL103.nvidia.com (10.18.16.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 16 Sep 2020 14:45:04 +0000 Received: from NAM10-DM6-obe.outbound.protection.outlook.com (104.47.58.100) by HKMAIL101.nvidia.com (10.18.16.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 16 Sep 2020 14:45:03 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=B2YzPJAGbXPnqcIDIBY5ess/Fuz/3u9fjbbmVgXZbq2+MHmLkYygcDmmVTWuVnbOVvfqVt6v0ooQFcK0ARpFPMq3DRXxHkoFjjH1d7RRDu7CWBwgxej6gdxHQASuoDtykDXHTeUNvZ7RdEy/Pq6KikpIkLFbl+TjF4O6kJXADieU8SwC/XjvzxEvfQoGNn/lRhmLgaFe6SqSzRk9cn4XTq1w3dFjdw+4fxiJDWSrT3EcRUvf1Gw12g5d8IgwgSmSuXXBlQv+gXA/gcNg0yWEvXXD49pUdWgOfaOeXXj/wq/h6UojZYUsJjboDg/x7cbHd0GanItjVuJtPIRVV2P7Ig== 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=DzYZSSVKCkJQZhZA+HDpDGnRTubhdVTgS2kIRgojQZU=; b=VOry+FRn9f2GiaZg0Re/ZtgOeFJLwy4uFD/DQx5nNz/Nz07xE9WZ7/kwYHdoOkOEpNzXPZOcgAJruuTmC0rFS5NtmBEqyI5mgSgg09Ge6lttupxUPXrEltSWDJPNJHeHF2XXRWDB7FiSmmdtKijypfuQ7P93p8rLCj3eLhI0RjJYJGGRvum7PATvnssPmlLc/BpDTM9kOISx/DaNfO60VIkfJw2Wjt+7PDbDKmkcMTUtdjKGjPsny/0+XFd/OvOs254R/1GEI8naoJrahGu5R1m5oxBRTnXU1xfJiVdZqatFRj+dwGkyQyfVILvAZhBBEveOWSVyfKFOMz4HcL3s2g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none Authentication-Results: intel.com; dkim=none (message not signed) header.d=none;intel.com; dmarc=none action=none header.from=nvidia.com; Received: from DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) by DM6PR12MB2601.namprd12.prod.outlook.com (2603:10b6:5:45::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3391.11; Wed, 16 Sep 2020 14:45:01 +0000 Received: from DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::cdbe:f274:ad65:9a78]) by DM6PR12MB3834.namprd12.prod.outlook.com ([fe80::cdbe:f274:ad65:9a78%7]) with mapi id 15.20.3391.011; Wed, 16 Sep 2020 14:45:01 +0000 Date: Wed, 16 Sep 2020 11:44:59 -0300 From: Jason Gunthorpe To: "Tian, Kevin" Subject: Re: [PATCH v7 00/16] vfio: expose virtual Shared Virtual Addressing to VMs Message-ID: <20200916144459.GC6199@nvidia.com> References: <20200914134738.GX904879@nvidia.com> <20200914162247.GA63399@otc-nc-03> <20200914163354.GG904879@nvidia.com> <20200914105857.3f88a271@x1.home> <20200914174121.GI904879@nvidia.com> <20200914122328.0a262a7b@x1.home> <20200914190057.GM904879@nvidia.com> <20200914163310.450c8d6e@x1.home> <20200915142906.GX904879@nvidia.com> Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: MN2PR13CA0018.namprd13.prod.outlook.com (2603:10b6:208:160::31) To DM6PR12MB3834.namprd12.prod.outlook.com (2603:10b6:5:14a::12) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from mlx.ziepe.ca (156.34.48.30) by MN2PR13CA0018.namprd13.prod.outlook.com (2603:10b6:208:160::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3391.6 via Frontend Transport; Wed, 16 Sep 2020 14:45:01 +0000 Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1kIYg7-0003Dj-Rt; Wed, 16 Sep 2020 11:44:59 -0300 X-Originating-IP: [156.34.48.30] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: d0b09e29-9a85-4d6e-3280-08d85a4f172e X-MS-TrafficTypeDiagnostic: DM6PR12MB2601: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 1cNvNlH7n8LDgEJiLuijNYu9YAdqbQqp48Y2gNVQT3YGW2izejgdLaSTF6iOTwfKldlcCeC9nn/tAEYroOQyvtxHE4hM/c71yHbER+b0tBBtYe+Rvr/dHlsJleJVDYj4xQMLEaWy2IXpFtXVA9L10UNwyoNBT+1mHLfT9eFjEpo1RYac+o6UK7n/o5pUyk3t5FH1ohQaqpa7xliv6C/QKLda3UFESDzx1Ccu/Kn5OZViFkIrR2goUe6jDFa80I4pm/C+NAwaqxeUxaj6zWdx+aAYVxygVdfFQbcBOSurbnp6QQ0J/5LH/gs2H1XJ/3mii0qJeYIKltK66Eeu+8arx/Ok6nRx3yzsNBbzBhs2YtfWQz5f8oVLsXjYxLjZw8qi X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:DM6PR12MB3834.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(396003)(366004)(346002)(376002)(39860400002)(136003)(6916009)(2616005)(26005)(478600001)(9746002)(426003)(8936002)(54906003)(4326008)(9786002)(316002)(66946007)(86362001)(8676002)(66476007)(66556008)(186003)(36756003)(5660300002)(2906002)(1076003)(33656002)(7416002); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-MS-Exchange-CrossTenant-Network-Message-Id: d0b09e29-9a85-4d6e-3280-08d85a4f172e X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB3834.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Sep 2020 14:45:01.7960 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: E0LHyzGiDBt4HKFlp8VzCddzRgsFdYdCqOic9NPyakJFYwGRlJ/mcevYt/rEHVTu X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB2601 X-OriginatorOrg: Nvidia.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1600267505; bh=DzYZSSVKCkJQZhZA+HDpDGnRTubhdVTgS2kIRgojQZU=; h=X-PGP-Universal:ARC-Seal:ARC-Message-Signature: ARC-Authentication-Results:Authentication-Results:Date:From:To:CC: Subject:Message-ID:References:Content-Type:Content-Disposition: In-Reply-To:X-ClientProxiedBy:MIME-Version: X-MS-Exchange-MessageSentRepresentingType:X-Originating-IP: X-MS-PublicTrafficType:X-MS-Office365-Filtering-Correlation-Id: X-MS-TrafficTypeDiagnostic:X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers:X-MS-Exchange-SenderADCheck: X-Microsoft-Antispam:X-Microsoft-Antispam-Message-Info: X-Forefront-Antispam-Report:X-MS-Exchange-AntiSpam-MessageData: X-MS-Exchange-CrossTenant-Network-Message-Id: X-MS-Exchange-CrossTenant-AuthSource: X-MS-Exchange-CrossTenant-AuthAs: X-MS-Exchange-CrossTenant-OriginalArrivalTime: X-MS-Exchange-CrossTenant-FromEntityHeader: X-MS-Exchange-CrossTenant-Id:X-MS-Exchange-CrossTenant-MailboxType: X-MS-Exchange-CrossTenant-UserPrincipalName: X-MS-Exchange-Transport-CrossTenantHeadersStamped:X-OriginatorOrg; b=pZcPgCcTmwgLRaEo9M7yp6GNYXx2L0qWifgazIARt6ZUv34gfZlKRWbFoM72PIFh+ NyQqIKSX8LaiUflNgyxJJFM59KbD8c3FvA6cq84ThA+dONwT+/TUZ4MengIlwNtHvP XFfhBvVxYtzulNohppxoIfAsyNiW+5nZxgA5/J0KQATmoxYTgr6O2r13uWifxl9Lrk QezIjzieMUiui1eM6iDvUSzwGyHOqaWgH5CiA/PLhtCOUUdsung0P1AuZT64hydMF+ 1T2G2Bs8uNwT6bfa4Iw5B/I7dzPg59N81/DmCcjvDri6UsEblThhbDw9kmmNGCezrS zZjztDGZi/uvQ== Cc: "Sun, Yi Y" , Jean-Philippe Brucker , "Raj, Ashok" , "kvm@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "stefanha@gmail.com" , Jason Wang , "Michael S. Tsirkin" , "Tian, Jun J" , Alex Williamson , "Wu, Hao" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Wed, Sep 16, 2020 at 01:19:18AM +0000, Tian, Kevin wrote: > > From: Jason Gunthorpe > > Sent: Tuesday, September 15, 2020 10:29 PM > > > > > Do they need a device at all? It's not clear to me why RID based > > > IOMMU management fits within vfio's scope, but PASID based does not. > > > > In RID mode vfio-pci completely owns the PCI function, so it is more > > natural that VFIO, as the sole device owner, would own the DMA mapping > > machinery. Further, the RID IOMMU mode is rarely used outside of VFIO > > so there is not much reason to try and disaggregate the API. > > It is also used by vDPA. A driver in VDPA, not VDPA itself. > > PASID on the other hand, is shared. vfio-mdev drivers will share the > > device with other kernel drivers. PASID and DMA will be concurrent > > with VFIO and other kernel drivers/etc. > > Looks you are equating PASID to host-side sharing, while ignoring > another valid usage that a PASID-capable device is passed through > to the guest through vfio-pci and then PASID is used by the guest > for guest-side sharing. In such case, it is an exclusive usage in host > side and then what is the problem for VFIO to manage PASID given > that vfio-pci completely owns the function? This is no different than vfio-pci being yet another client to /dev/sva Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu