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Fri, 7 Nov 2025 10:02:49 -0800 Date: Fri, 7 Nov 2025 10:02:48 -0800 From: Nicolin Chen To: Jason Gunthorpe CC: Alex Williamson , Christian =?iso-8859-1?Q?K=F6nig?= , , , Joerg Roedel , Kevin Tian , , , , , Robin Murphy , "Shuah Khan" , Sumit Semwal , Will Deacon , Krishnakant Jaju , Leon Romanovsky , Matt Ochs , , Simona Vetter , Vivek Kasireddy , Xu Yilun Subject: Re: [PATCH 2/9] iommufd: Add DMABUF to iopt_pages Message-ID: References: <0-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> <2-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <2-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00005FFE:EE_|PH7PR12MB7020:EE_ X-MS-Office365-Filtering-Correlation-Id: d90d3fcf-8da1-477a-d617-08de1e27e5a7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|1800799024|376014|7416014|82310400026; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2025 18:03:03.6857 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d90d3fcf-8da1-477a-d617-08de1e27e5a7 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN1PEPF00005FFE.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB7020 On Fri, Nov 07, 2025 at 12:49:34PM -0400, Jason Gunthorpe wrote: > Add IOPT_ADDRESS_DMABUF to the iopt_pages and the basic infrastructure to > create an iopt_pages from a struct dma_buf *. > > DMABUF pages are not supported for accesses, and for now can only be used > with the VFIO DMABUF exporter. > > The overall flow will be similar to memfd where the user can pass in a > DMABUF file descriptor to IOMMU_IOAS_MAP_FILE and create an area and > pages. Like other areas it can be copied and otherwise manipulated, though > there is little point in doing so. > > There is no pinned page accounting done for DMABUF maps. > > The DMABUF attachment exists so long as the dmabuf is mapped into an IOAS, > even if the IOAS is not mapped to any domains. > > Signed-off-by: Jason Gunthorpe Reviewed-by: Nicolin Chen