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Thu, 15 Jul 2021 17:53:38 +0000 Received: from BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::d017:af2f:7049:5482]) by BL0PR12MB5506.namprd12.prod.outlook.com ([fe80::d017:af2f:7049:5482%5]) with mapi id 15.20.4331.024; Thu, 15 Jul 2021 17:53:38 +0000 Date: Thu, 15 Jul 2021 14:53:36 -0300 From: Jason Gunthorpe To: "Raj, Ashok" Cc: "Tian, Kevin" , Shenming Lu , "Alex Williamson (alex.williamson@redhat.com)" , Jean-Philippe Brucker , David Gibson , Jason Wang , "parav@mellanox.com" , "Enrico Weigelt, metux IT consult" , Paolo Bonzini , Joerg Roedel , Eric Auger , Jonathan Corbet , "Liu, Yi L" , "Wu, Hao" , "Jiang, Dave" , Jacob Pan , Kirti Wankhede , Robin Murphy , "kvm@vger.kernel.org" , "iommu@lists.linux-foundation.org" , David Woodhouse , LKML , Lu Baolu , "wanghaibin.wang@huawei.com" Subject: Re: [RFC v2] /dev/iommu uAPI proposal Message-ID: <20210715175336.GH543781@nvidia.com> References: <7ea349f8-8c53-e240-fe80-382954ba7f28@huawei.com> <20210715124813.GC543781@nvidia.com> <20210715135757.GC590891@otc-nc-03> <20210715152325.GF543781@nvidia.com> <20210715162141.GA593686@otc-nc-03> <20210715171826.GG543781@nvidia.com> <20210715174836.GB593686@otc-nc-03> Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?9yrwgJAoiR0veLWutXCMdTCKxShh5bT5TuFFH7FUKaAnTBWMRwjgLUzcddMu?= =?us-ascii?Q?8+rpbrL9KCIVoJN+p9vORE3oOgwWEzgvlq47jiAetB9fZrEE0gTggQ2bbg3f?= =?us-ascii?Q?4HvDQAgJXQ4ic6CTtp+eV+o7A1qmvZJwBpuadgKcZ7FDmDkPVrzDof+iZLmw?= =?us-ascii?Q?q2CzX2cMmj91G3w5BiRDiapWzeaARo//zU6vAOwdE1ckXPATFOwJXVRgBeYr?= =?us-ascii?Q?BjeFirzZeha6bl7YPaImKCHOgv1JwQa8YTGxJ7pGrJ4DKGUYSo+ThLRV4X8T?= =?us-ascii?Q?UNskj/FSQoNhogOkuRqCYpV0+m8favBs/DtKXMl3x4tEXJX2gJaOaKB7ejK+?= =?us-ascii?Q?OZB1WVSn4fmiG0EBL/RQBCyJxQpSuvhaqGj2VCfj6A4UWK7fyKhUrmb6IFZS?= =?us-ascii?Q?tuzLMDVpTNus2IO+TeOXGwpzxF7BqfijUL7bpoN0l9H7YmPdd4qE5iQmgAIX?= =?us-ascii?Q?zr4KzkmmFN58apnzE2IT8Si+xFGym7vGkuV9rwWxMXziSStUA4T6G5URiF4f?= =?us-ascii?Q?JqFvweCRJUwlhWMNwKVvF7eLZyRZbZ2XhtCToKuOvg9oVs4hlrZ4QQik82Se?= =?us-ascii?Q?cLa3eHIF2C5bmoqHOp7RsIGGJAo9uvdIZlYMZKDV7rm1WIjBd92U8BYhXN4j?= =?us-ascii?Q?wNZi4rwq57UTHhXwG5N+oDM0kwqc+nRir694d9/HyCAee67gQfitr1vrGKYp?= =?us-ascii?Q?cRKjCX0ji1Nm+VaAlpj5jtyr2p79kbkX5oCLDkdICr7JclnjqKosG87GoNf6?= =?us-ascii?Q?pBUDD4SnkRktTerzFKwLjvslXW798zMlXGGAZMFVrF1yxGb158dkIh6J9yRS?= =?us-ascii?Q?u9fPUcJ36b1TzjiifsM3tsayqVxwExenlvDaGoGJYDuW82UlZC6wIgv2l5YY?= =?us-ascii?Q?uRLOji5yE4Xpj2XU1nw1GpdL1WdLyQp/YvkoxE9xpcgEKR+3vhVeEycPMTFs?= =?us-ascii?Q?s1EnHsfpEyhvRKFSlDe4aZQKMsMq8Mz7jx5LVSXEELTeF9okxbR9J78ukkM0?= =?us-ascii?Q?HZQZbAy8WeXE5ymqH36zE2I4tOnlrvCUlzx4kSkMdUYGNCwNC2ftzQA+0HMW?= =?us-ascii?Q?EsU/skM6JOC3MCevCci7lhBwEfPutcxa5vj9lAMlSNTLx1VQ0C/NgopiCkTp?= =?us-ascii?Q?15f1nZfbvwPzV54PpuoVQKhs0IhVsYKQoUj3hY9YmAK07rR4VoT+76gZZfnc?= =?us-ascii?Q?7KlpSRE6bSa/MexnshpUAeSULd9yztl0wbcUDI5AwNQqkV+J5aoCClgKAs+Y?= =?us-ascii?Q?76cbU5of+gTFPxW9ozBx7adIl9qYj7cDteZyZ26ZjC0CkgVMvEq6ekrm9j9a?= =?us-ascii?Q?CIwqnOQEgmqecgXotYv6YgTR?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2dcd2400-e72c-4ee9-363f-08d947b979b8 X-MS-Exchange-CrossTenant-AuthSource: BL0PR12MB5506.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jul 2021 17:53:38.7866 (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: oxvgb5EmDQz54joG/1Z/lnmbQSb9tpsylbtZ4hedWnHcJTcjFNg0dfn2Ldd0rjdE X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5080 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 15, 2021 at 10:48:36AM -0700, Raj, Ashok wrote: > > > Do we have any isolation requirements here? its the same process. So if the > > > page-request it sent to guest and even if you report it for mdev1, after > > > the PRQ is resolved by guest, the request from mdev2 from the same guest > > > should simply work? > > > > I think we already talked about this and said it should not be done. > > I get the should not be done, I'm wondering where should that be > implemented? The iommu layer cannot have ambiguity. Every RID or RID,PASID slot must have only one device attached to it. Attempting to connect two devices to the same slot fails on the iommu layer. So the 2nd mdev will fail during IOASID binding when it tries to bind to the same PASID that the first mdev is already bound to. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Thu, Jul 15, 2021 at 10:48:36AM -0700, Raj, Ashok wrote: > > > Do we have any isolation requirements here? its the same process. So if the > > > page-request it sent to guest and even if you report it for mdev1, after > > > the PRQ is resolved by guest, the request from mdev2 from the same guest > > > should simply work? > > > > I think we already talked about this and said it should not be done. > > I get the should not be done, I'm wondering where should that be > implemented? The iommu layer cannot have ambiguity. Every RID or RID,PASID slot must have only one device attached to it. Attempting to connect two devices to the same slot fails on the iommu layer. So the 2nd mdev will fail during IOASID binding when it tries to bind to the same PASID that the first mdev is already bound to. Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu