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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc7edge2.nvidia.com; CAT:NONE; SFS:(13230040)(36860700013)(1800799024)(376014)(7416014)(82310400026); DIR:OUT; SFP:1101; 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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