Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Fri, 4 Jun 2021 09:13:37 -0300
From:   Jason Gunthorpe <jgg@nvidia.com>
To:     Alex Williamson <alex.williamson@redhat.com>
Cc:     "Tian, Kevin" <kevin.tian@intel.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>,
        "Jiang, Dave" <dave.jiang@intel.com>,
        "Raj, Ashok" <ashok.raj@intel.com>,
        "kvm@vger.kernel.org" <kvm@vger.kernel.org>,
        Jonathan Corbet <corbet@lwn.net>,
        Robin Murphy <robin.murphy@arm.com>,
        LKML <linux-kernel@vger.kernel.org>,
        "iommu@lists.linux-foundation.org" <iommu@lists.linux-foundation.org>,
        David Gibson <david@gibson.dropbear.id.au>,
        Kirti Wankhede <kwankhede@nvidia.com>,
        David Woodhouse <dwmw2@infradead.org>,
        Jason Wang <jasowang@redhat.com>
Subject: Re: [RFC] /dev/ioasid uAPI proposal
Message-ID: <20210604121337.GJ1002214@nvidia.com>
References: <20210602120111.5e5bcf93.alex.williamson@redhat.com>
 <20210602180925.GH1002214@nvidia.com>
 <20210602130053.615db578.alex.williamson@redhat.com>
 <20210602195404.GI1002214@nvidia.com>
 <20210602143734.72fb4fa4.alex.williamson@redhat.com>
 <20210602224536.GJ1002214@nvidia.com>
 <20210602205054.3505c9c3.alex.williamson@redhat.com>
 <MWHPR11MB1886DC8ECF5D56FE485D13D58C3C9@MWHPR11MB1886.namprd11.prod.outlook.com>
 <20210603124036.GU1002214@nvidia.com>
 <20210603144136.2b68c5c5.alex.williamson@redhat.com>
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210603144136.2b68c5c5.alex.williamson@redhat.com>
MIME-Version: 1.0
X-MS-Exchange-MessageSentRepresentingType: 1
Received: from mlx.ziepe.ca (47.55.113.94) by BL0PR05CA0010.namprd05.prod.outlook.com (2603:10b6:208:91::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.11 via Frontend Transport; Fri, 4 Jun 2021 12:13:38 +0000
Received: from jgg by mlx with local (Exim 4.94)        (envelope-from <jgg@nvidia.com>)        id 1lp8hl-001dIN-Rh; Fri, 04 Jun 2021 09:13:37 -0300
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: 9a294eda-15ff-4dc4-32f5-08d927522f83
X-MS-TrafficTypeDiagnostic: BL1PR12MB5093:
X-MS-Exchange-Transport-Forked: True
X-Microsoft-Antispam-PRVS: <BL1PR12MB5093C405A2F8EEBDCA726EF7C23B9@BL1PR12MB5093.namprd12.prod.outlook.com>
X-MS-Oob-TLC-OOBClassifiers: OLM:3968;
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:BL0PR12MB5506.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(346002)(136003)(39860400002)(366004)(396003)(376002)(66946007)(66476007)(66556008)(33656002)(4744005)(1076003)(5660300002)(7416002)(2906002)(6916009)(86362001)(426003)(2616005)(478600001)(8936002)(186003)(26005)(4326008)(9786002)(36756003)(9746002)(54906003)(316002)(8676002)(38100700002);DIR:OUT;SFP:1101;
X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?/NAmOWHQbGYPasTQREseRXAK3INa58CdBte4oLTfq/etAnkIB1zB85qwzwxk?=
 =?us-ascii?Q?PSHFyXo/3gFo4Ibrf2LRTUW/sxskQHgqI76juRnbWBqd2+soIZoFfbMv/hGU?=
 =?us-ascii?Q?hqrNhO4UnrWlIBz04SQjofzvjkcmS193ZZ/oLj95mrZEHVlEI2QKIenp8hGR?=
 =?us-ascii?Q?VMtLQ12kMXz3hbmHoy7iU58RcxmH7rPOEBxTFID1N9/8xyTCQ/RTefrDDXZZ?=
 =?us-ascii?Q?4yK3pLetNfItqndE2j34MMAc0G3RV27/V3kUjYBKUJvlmq3p768Zl1XyXBoZ?=
 =?us-ascii?Q?n3d2aOfeno1orOLGPJpLr7/5W1QQY5wdb+9Fc1Z0cHj0aIiFe+XRctoq0Sij?=
 =?us-ascii?Q?D1bIGcyONggu+JKHgQNgvdpc+jnYfD10GFxjP7kwQTTpoJo7G752/rl0fRQq?=
 =?us-ascii?Q?kjOiOC/zQPFeI/f/SG+XNJFFkPB6hSAXnYCMQ9FTFgy1wX1gFKhRMZ8emojL?=
 =?us-ascii?Q?Ka5dOikIwhz1iK3bwUs9Rm/XReaqA7rCq/NbZZ4lCsmXf546k+ge5A2saYTb?=
 =?us-ascii?Q?D5qXl1OUAmDfX5uevBFBRCkcyeO0r7o8ECvqsgxH9KZQ2p9McxwrN9rY0Efj?=
 =?us-ascii?Q?/DiDtH8djqvFGDmjuCTDNgs88TbSa+yh2tSERvZmUP3qL828VG8rcKhj51E1?=
 =?us-ascii?Q?XdATrl13SPmBv/WEzOfdo3a8kdFmyRSUUBReNVlqg5fDWUf6DL9xK/i+qWwg?=
 =?us-ascii?Q?OkCq/U1Dgt6CO0ntjx+/wCaJLK2WyQjeGXNwpDWUfrW0ccwsYHMZdadoQPxV?=
 =?us-ascii?Q?vrvpIrDWqLNJ5WOt2iBPZ3IaO/9Cz+Hv6h2S6DF8iTrVq+jTShx1wfxC3kSt?=
 =?us-ascii?Q?xoleGi/RvEciQTXUEeQlFy1YQt0/bnQskP/KVRpNGfrCVYDNDdGWzX8TE1/1?=
 =?us-ascii?Q?wrvXURXpHt1SaWcl0coiaeO3Zo93DMlbZrw4ivLOcasUgDhetEJnIZKbsuQy?=
 =?us-ascii?Q?ji69m3LmEgGkPk8LZoaeRqR+q6nts6ku+RNO/+OQ1cDKfin5SSOcrF4fbv7q?=
 =?us-ascii?Q?xfaY1nrN4XA4cF+5yw6ZnUrctcSzZV12iuo3+eId/YKwxLBEnCXiZCmmCdbv?=
 =?us-ascii?Q?E/z4rR7qi5YD1uCHxgY6dlab7GkZ6iy4ayB5vrq98G6orTWtB91SjifmfExS?=
 =?us-ascii?Q?R842swUMky+2Cn+yKJQ59e/6jZIlT+GqacjwQYZ1JVLRWwxZrUskYmaKeV4y?=
 =?us-ascii?Q?rfPQfdV1XmHlrfbJi19ilkrI99Iq8seDLLioitM0GlcfKctI/aiubtSgmp6Z?=
 =?us-ascii?Q?JhaPWNQNIqqHtOsepgMOnusDTFtzeJgAYVHpFKJuQlE7Czg3Jl9vTjdmEp8n?=
 =?us-ascii?Q?5BjhWAqWEXqmLMPs5OuQeRUb?=
X-OriginatorOrg: Nvidia.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 9a294eda-15ff-4dc4-32f5-08d927522f83
X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB5506.namprd12.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Jun 2021 12:13:38.8869
 (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: p8K8k1aOvwIVIFiub8/xBtKGwCB8YsXKikcd1I+aq74YS/QS6xawy+9Z7ZJTpCU+
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5093
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Thu, Jun 03, 2021 at 02:41:36PM -0600, Alex Williamson wrote:

> Could you clarify "vfio_driver"?  

This is the thing providing the vfio_device_ops function pointers.

So vfio-pci can't know anything about this (although your no-snoop
control probing idea makes sense to me)

But vfio_mlx5_pci can know

So can mdev_idxd

And kvmgt

Jason