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Thu, 13 Nov 2025 15:28:43 -0800 Date: Thu, 13 Nov 2025 15:28:41 -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 5/9] iommufd: Allow MMIO pages in a batch Message-ID: References: <0-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> <5-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <5-v1-af84a3ab44f5+f68-iommufd_buf_jgg@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000E9DC:EE_|MW4PR12MB7261:EE_ X-MS-Office365-Filtering-Correlation-Id: d25a23e7-4b13-41df-fc73-08de230c6b41 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|82310400026|376014|1800799024|36860700013; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Nov 2025 23:28:57.8172 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d25a23e7-4b13-41df-fc73-08de230c6b41 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000E9DC.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7261 On Fri, Nov 07, 2025 at 12:49:37PM -0400, Jason Gunthorpe wrote: > Addresses intended for MMIO should be propagated through to the iommu with > the IOMMU_MMIO flag set. > > Keep track in the batch if all the pfns are cachable or mmio and flush the > batch out of it ever needs to be changed. Switch to IOMMU_MMIO if the > batch is MMIO when mapping the iommu. > > Signed-off-by: Jason Gunthorpe Reviewed-by: Nicolin Chen