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Thu, 12 Mar 2026 23:15:17 -0700 Date: Thu, 12 Mar 2026 23:15:16 -0700 From: Nicolin Chen To: "Aneesh Kumar K.V (Arm)" CC: , , , Kevin Tian , Joerg Roedel , Will Deacon , Bjorn Helgaas , Jonathan Cameron , "Dan Williams" , Alexey Kardashevskiy , Samuel Ortiz , Xu Yilun , "Jason Gunthorpe" , Suzuki K Poulose , "Steven Price" Subject: Re: [PATCH v2 1/3] iommufd/viommu: Allow associating a KVM VM fd with a vIOMMU Message-ID: References: <20260309111704.2330479-1-aneesh.kumar@kernel.org> <20260309111704.2330479-2-aneesh.kumar@kernel.org> Precedence: bulk X-Mailing-List: kvm@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: <20260309111704.2330479-2-aneesh.kumar@kernel.org> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000026C9:EE_|MW4PR12MB6801:EE_ X-MS-Office365-Filtering-Correlation-Id: 6330ab7f-bd7d-49e4-2861-08de80c7ee1a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|7416014|36860700016|1800799024|13003099007|56012099003|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: YtAOJ3n497EgWwcWR9ULhkjeybMDv6EIYKh95h4qte+JKTKaeHg5R0J1owRNPWuUHQM5VYDNDRiWSSFkmnS//uXC7utSpjGGTwmGTFn4iFNJ8TmQ/K3oEg4zh6N/dZ/egBQRCJotGZHRgVnTGjcLWOzK8xezdyvrDwwUwdpFqxuK/9xMkNs0RiIDsz2cntX9dXBUWJS9RDX31ynIdkazYpATpjvRJ0vC65M6V9Uof2JrzQwPpONMqOZublaYTHJEPXn8HEmI7vPiFwbG2LDtv33X27iYSTcOh5Hko9o5sWoNmmRnPOCwsi1+MMfMnPjIR+Dz5NguJv/wOppEQ23t909PS89FD4wwbNKA8eUobuE2lyV3813P3KcX9z+GBrH/pq3mTFTDYa0T0HigDFS2a2DHlWs8ilxD1DqAtpgkAw3suDJX/7hVg9DZyBqrnZxW X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Mar 2026 06:15:31.4301 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6330ab7f-bd7d-49e4-2861-08de80c7ee1a 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: SJ1PEPF000026C9.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6801 On Mon, Mar 09, 2026 at 04:47:02PM +0530, Aneesh Kumar K.V (Arm) wrote: > Add optional KVM association to IOMMU_VIOMMU_ALLOC by introducing > IOMMU_VIOMMU_KVM_FD and iommu_viommu_alloc::kvm_vm_fd. > > When the flag is set, iommufd validates that kvm_vm_fd refers to a KVM > VM file and stores a referenced struct file in the vIOMMU object, so > later iommufd operations can safely resolve the owning VM. > > This is preparatory plumbing for subsequent patches that bind TDI state > to the associated KVM VM. > > The patch also switch file_is_kvm from EXPORT_SYMBOL_FOR_KVM_INTERNAL to > EXPORT_SYMBOL_GPL so that iommu module can use that. struct vfio_device has the kvm pointer already. So, I think it could be forwarded from VFIO side v.s. via userspace ioctl. Shammer had two patches before and Jason partially reviewed. I took those for a side project but haven't sent anywhere. Would you please check if they for you? https://github.com/nicolinc/iommufd/commits/wip/viommu_kvm Nicolin