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Fri, 7 Nov 2025 09:52:47 -0800 Date: Fri, 7 Nov 2025 09:52:45 -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 0/9] Initial DMABUF support for iommufd Message-ID: References: <0-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: <0-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B072:EE_|DM4PR12MB6230:EE_ X-MS-Office365-Filtering-Correlation-Id: e28cb06e-ca58-4c16-7e26-08de1e268332 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|7416014|36860700013|13003099007; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2025 17:53:08.9998 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e28cb06e-ca58-4c16-7e26-08de1e268332 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B072.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6230 On Fri, Nov 07, 2025 at 12:49:32PM -0400, Jason Gunthorpe wrote: > This is on github: https://github.com/jgunthorpe/linux/commits/iommufd_dmabuf > > v2: > - Rebase on Leon's v7 > - Fix mislocking in an iopt_fill_domain() error path I have verified this v2 using the branch above, by drafting a QEMU patch for dmabuf on top of Shameer's vSMMU v5 series: https://github.com/nicolinc/qemu/commits/wip/iommufd_dmabuf/ With that, I see GPU BAR memory be correctly fetched in the QEMU: vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 0", offset: 0x0, size: 0x1000000 vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 2", offset: 0x0, size: 0x44f00000 vfio_region_dmabuf Device 0009:01:00.0, region "0009:01:00.0 BAR 4", offset: 0x0, size: 0x17a0000000 Tested-by: Nicolin Chen