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Mon, 30 Jun 2025 12:50:58 -0700 Date: Mon, 30 Jun 2025 12:50:57 -0700 From: Nicolin Chen To: Xu Yilun CC: , , , , , , , , , , , , , Subject: Re: [PATCH v3 1/5] iommufd: Add iommufd_object_tombstone_user() helper Message-ID: References: <20250627033809.1730752-1-yilun.xu@linux.intel.com> <20250627033809.1730752-2-yilun.xu@linux.intel.com> Precedence: bulk X-Mailing-List: iommu@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: <20250627033809.1730752-2-yilun.xu@linux.intel.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000026C6:EE_|MW4PR12MB7167:EE_ X-MS-Office365-Filtering-Correlation-Id: d1752e9a-fc9a-40ec-41fb-08ddb80f77bc X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|376014|7416014|82310400026|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?d1igaRvnDFWpQIX1myKclwfdnrwbEf0/HhWMsW203hG35bSRY7c6C3+HWCAb?= =?us-ascii?Q?SrBLfyMffZQGjdSv2UWc26ag5wZAV63sqNqf2q47o8RRCymlAKC8HEiTtl7w?= =?us-ascii?Q?skeGwmYtPdIwdSzxJv1aaoV6ZA1/1OORVXjobrN5/qfe+vwyEW7s305TR00M?= =?us-ascii?Q?x00xZMK3twxX3qdwCPRWngmr+4YrJaGhQ2Y3SSrO5Zv0UduFzinCijms/sPb?= =?us-ascii?Q?MuK6qotacOfX8An1gxl3HKAxzvjlYKyb8QQmRbZMbxNjQGRQuuH1maH6beAs?= =?us-ascii?Q?NABjxCPNsG7abP6Zp654EcjpcP6QSk+iC8K0nGAEF5iEY/q7HsnUdxpZZQb1?= =?us-ascii?Q?xXKAax/LgTqyW3ZyVvMhNr5dgmAABDjGkgZsaY/daceagePOePpWlMKLILkH?= =?us-ascii?Q?4jXM4+tk2bgYay3rLW+0TP7zVgSjAs1KCoGmiC/7sGITgwoAeFOLz5eHlWRu?= =?us-ascii?Q?opMQ41KlLnSFv4QoI5Sji5wnBVke8Yxwx7BuDH9gIOOaWa+Ri53yaIvZ58Az?= =?us-ascii?Q?fKOb8qZ7GvxBWI7ZtsK6V/PbXoB6VgZVx62rbykjbBbncg6gv3Kzo48MA2v3?= =?us-ascii?Q?nUs2OgLCEBE/gVUs4l9WcYL53nXHz39gP3v5+FCX4KFenGfvtc+4nuW1TEHT?= =?us-ascii?Q?WykmXWRZN8uc3AjOon/mwDC7Wj61LlF5mStOGnPodsjbUrSMeUA12Pp3vwax?= =?us-ascii?Q?zPCuBNcAeA1+6WMbjitD5Xv+ROc6hjQYBkEHjOlmToNrOoQxfTU5bGMT/Nvh?= =?us-ascii?Q?K2p6+MH+Z4/ajYfzkiyhy4PHa57cDFOgnN7828HxursvcjphH4nY9y7ex66Q?= =?us-ascii?Q?UtX02VlCyw+Lq+kqqGcZoVAA8wDUMNLXRuepEEidAUZ+Js1QOfYiJiuhQDor?= =?us-ascii?Q?VzFb12RGcjw61RohfFjHfB47KQcmRDcu3XXU8F8NaRq3p5mMY/4wlS4qEgxX?= =?us-ascii?Q?yqSky+zRF8oYbehWUQ5kkIqbnY11rXC+gXt5JLbRlNfEF5SPZi1AAp8Oie62?= =?us-ascii?Q?Kv6lpgDMHTL/3vtjumMYOgBawLjNs0+IlrvL5KNijk/tRINFQm0gH+lPvi4Y?= =?us-ascii?Q?KzbOAaFuS+xNY2cU4nroAHuDY5xQTDgpmDonD9+lmfNclRkIj8A44Xm154GI?= =?us-ascii?Q?7PpasnXuf9wkRSiYZVpmAwX3eycAHrz8nqbCFktjR/5lEGP7vZo3Fx1Ytk/J?= =?us-ascii?Q?7CTlgd9j6mEZVI8Epc5skk+WMOccB2eJPPKHBMiaL6PIr/N+jZgGUANppVth?= =?us-ascii?Q?FeZm0M5kLPEONBEOKisfMExVdgq+2iNhNCLj+peEoJKiOGEefpL9PKhsQmxW?= =?us-ascii?Q?YgIw2p3kleQLq7++DJMWpUPwUaPCAoWEzslPheedJmJ6oWpBB+/H20LWOYFs?= =?us-ascii?Q?njg9FqjMsohGMZfy2sf0Uo6NXx2TFn6WmLNdI8pkVlIT2bctdh5EhZqQrY8d?= =?us-ascii?Q?msLdA9J9iPEUCNxjRxVoygWuz+9G6ZaIF5Xi0mAq2uMkQu5H1jLXLa+rVF1F?= =?us-ascii?Q?+wksK1lrh6MIgHIQ9Lj4XWuXZ18F5G+qS7pf?= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(376014)(7416014)(82310400026)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Jun 2025 19:51:12.8990 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d1752e9a-fc9a-40ec-41fb-08ddb80f77bc 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: SJ1PEPF000026C6.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7167 On Fri, Jun 27, 2025 at 11:38:05AM +0800, Xu Yilun wrote: > Add the iommufd_object_tombstone_user() helper, which allows the caller > to destroy an iommufd object created by userspace. Should we describe it "partially destroy"? > This is useful on some destroy paths when the kernel caller finds the > object should have been removed by userspace but is still alive. With > this helper, the caller destroys the object but leave the object ID > reserved (so called tombstone). The tombstone prevents repurposing the > object ID without awareness of the original user. > > Since this happens for abnomal userspace behavior, for simplicity, the s/abnomal/abnormal Nicolin