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Thu, 5 Sep 2024 11:04:12 -0700 Date: Thu, 5 Sep 2024 11:04:06 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v2 02/19] iommufd/viommu: Add IOMMUFD_OBJ_VIOMMU and IOMMU_VIOMMU_ALLOC ioctl Message-ID: References: <20240905155302.GM1358970@nvidia.com> <20240905174100.GV1358970@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240905174100.GV1358970@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF00003440:EE_|PH7PR12MB9224:EE_ X-MS-Office365-Filtering-Correlation-Id: 059d0f8c-4049-41da-0be6-08dccdd538fe X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|36860700013|376014|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?F+YZ5KpzNEV74t14gN4YJ9qrKcuC8TP6MBdQ/DxDXNsOp3ZZjDZVcwrnkVWA?= =?us-ascii?Q?oaz+eta2UZyYXD2ouLjfL7SRpUs/DQWkLby6dtpdgeNECZiTobl5rW9UTioO?= =?us-ascii?Q?13fGYceoHnJgF2Eho7kjZ50cnZFyTs9QiJKst22K8eZrqHXEnra0BVM/Nnuw?= =?us-ascii?Q?eZlTx1UsM8jKBg4MpSEbgNkumo6D3Ew+pcjLcaRHSMlmEOWs17BKY7rEX6dR?= =?us-ascii?Q?d2/2Jg++kZIqk+Dw01mJaNnHp1kuWYXqVCI6U1DNXHpKpl8saPugqklbPoH2?= =?us-ascii?Q?OUuCvTaxCyZiiU8cS3Kkacjvaox55WLugRGjKQBP/E9+wJVl3kLUucPAdt/D?= =?us-ascii?Q?Zn1Ki0sBF/VKl74EQzDcHxy2b6Z0D7waaVwMqJnhOXW76PyXv+fNzCDtc2/9?= =?us-ascii?Q?N9EZIQdlYERdDgjLxRENDzAK6U0wyuDqJc9d4FTCCpcDptAKKLw5hn/W0Sh+?= =?us-ascii?Q?ShoZ6L7NjcMlkBU7DHuX9cZo/zRkbFocd1kjk09tuY9xeh71v+dpTO5+1J/A?= =?us-ascii?Q?7BdQAalVRtBcqj+Tfwb8sRP/7nXFpDYZNchlG3JGX48D5rV5FiifgMMk3Rt0?= =?us-ascii?Q?nYu8cUtyJvotykA7M2STmUJ9Hq7pErw+Ug3JQVtf+fXYpXnbsh9DWYqIHdrV?= =?us-ascii?Q?oaE/02NDoVgq0XoplFHYqAUKZ3h0GoFK+lG3YtjoArJFK2pUdFVokIgkjJP5?= =?us-ascii?Q?KRcbBBnnO/BgkocZGrUoSZRC2J6FedDPKccEAnVtxRr2iabmuXbQ69FNGoe/?= =?us-ascii?Q?TQkzJzSlVAhXqSzs4xZD8+GZUqrh+7d0HlXGoV4VIBVCcYoTfAdW3AKoUj/i?= =?us-ascii?Q?ncsal4FBdheBLLWznJaPL8urpzSF8EXXalXTC6hNUTgDCvQ54REGikORFUL5?= =?us-ascii?Q?qv5N1BFQsBYlq2IKFl74eP6rXIzssuWBw/qG63BF9wsc9HSd9Jtsz0EW5nha?= =?us-ascii?Q?sDEfCieDIE6hTHFErz2Mbl9NLHOYb0ydXglav3+kShsuykbLzZ81Jw9fRWE+?= =?us-ascii?Q?kqAFI2YIidGwEpuWvypgQWHlfB8mJ0UkG6izRaWup5VvR/flb8KZWHQ/KZtW?= =?us-ascii?Q?/sKb60g8KXs64w1Gnhqv8uSlYvO0uXD+whGhkq3ErfEH1yoANrsIFB75uXhp?= =?us-ascii?Q?uy9EPgSQ0jgGrSeMBdGnfAjYrCp9MxAb0yk0oZXB+F4iDIWpGkWK1QFEE0N6?= =?us-ascii?Q?VAxbcgLr9BvCamJps04j/9LPiP19SBacCC1Qf/J7I4YVNeBSNGFCTIjQOA3Y?= =?us-ascii?Q?w+rXzy7t179mvRK2kEHWGhrD6H5h1Rnj/xuMIjaoxcBnev5lGM3Ift0t2Ptr?= =?us-ascii?Q?gdUJsDbVgwuf6LLV1kunnzY7asY4yt6K6T3s3jSYqKmXx4ChFYGJZM9e18Hk?= =?us-ascii?Q?riFzf5UZ9WKxheObMFRjelDECMHc46kTM3rc1USsjP31zfX2bcampQ3Ozrt1?= =?us-ascii?Q?5DEJFA2zTeWTbAGGd0OYYz44LvmjDCyO?= X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(7416014)(36860700013)(376014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Sep 2024 18:04:44.6106 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 059d0f8c-4049-41da-0be6-08dccdd538fe 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: DS2PEPF00003440.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB9224 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240905_110452_308041_2ECDFDC8 X-CRM114-Status: GOOD ( 11.67 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Sep 05, 2024 at 02:41:00PM -0300, Jason Gunthorpe wrote: > > > > + * @out_viommu_id: Output virtual IOMMU ID for the allocated object > > > > + * > > > > + * Allocate a virtual IOMMU object that holds a (shared) nesting parent HWPT > > > > > > Allocate a virtual IOMMU object that represents the underlying > > > physical IOMMU's virtualization support. The vIOMMU object is a > > > security isolated slice of the physical IOMMU HW that is unique to a > > > specific VM. Operations global to the IOMMU are connected to the > > > vIOMMU, such as: > > > - Security namespace for guest owned ID, eg guest controlled cache tags > > > - Virtualization of various platforms IDs like RIDs and others > > > - direct assigned invalidation queues > > > - direct assigned interrupts > > > - non-affiliated event reporting > > > - Delivery of paravirtualized invalidation > > > > Ack. > > Also write something about the HWPT.. Assuming it's about sharing parent HWPT, ack. Nicolin