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Wed, 28 May 2025 11:07:45 -0700 Date: Wed, 28 May 2025 11:07:43 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v5 09/29] iommufd: Do not unmap an owned iopt_area Message-ID: References: <3ddc8c678406772a8358a265912bb1c064f4c796.1747537752.git.nicolinc@nvidia.com> <20250528170845.GX61950@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250528170845.GX61950@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECD4:EE_|MW3PR12MB4492:EE_ X-MS-Office365-Filtering-Correlation-Id: 5f56261f-7834-4720-4a06-08dd9e12986d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?9QluxvScCz268DfQKpx8VYZgKsh1SOdQYMODK7V35DTz0RL7sap/zwxqoASF?= =?us-ascii?Q?Z5q7R58RcMrQf8ouLcwCTGogjZiQhDWNDtGi/TDwTasMxkJJ4IOoUlUPCDlN?= =?us-ascii?Q?JmpVhxGmDaDly8fiH+NhsnugpStnIsPKNLd72SWcpOG3EbT7GDOCjYLBh7RT?= =?us-ascii?Q?qngzokrsSqct0zRidQ7iJ1IpaqNjB0X2jrjVlRB8tAZchtmk8NWCQhFkEQVh?= =?us-ascii?Q?cETW/BYkDj4Lb1OOM20Otva1PB/ZgsDSFwHBIOEe26kU1gLQ44oT9qhKbui5?= =?us-ascii?Q?tz/gkqeCVHZDlhUsbGHqkaAvW+oZmicnqmf9jeWmeMG9ywtDAQ/eFlkjsVJU?= =?us-ascii?Q?426tH+72zJfTFa4+L668/3Ax51t5aa/kVBMVryYiyifP7B86l1UIKusMCrXf?= =?us-ascii?Q?FED6t5akBEUfQOA89nUefNKQU7dYcgRD6WQor8nPNuN7Ui2yiYZ7207aR2m8?= =?us-ascii?Q?DpVjM4eqXgPIdD027JYJY3dP/rqDudBN68YSgkj+1clR7Nmi2RUccpFr/772?= =?us-ascii?Q?TiP/pI/DNs+S8VqO09dww1s6W2ehqbnJN475lfD4zwWrXQZPNAPE3Rl0j44f?= =?us-ascii?Q?e1P/mkx/v6Fbnp7GOnVgEFOqMU2rEGNAvog44Vjj7rYTLnndfeXbgqX6Xtws?= =?us-ascii?Q?7VkDAQem7QOCDaHvmiKeGOVNjj43fVJQcby6TlTjXviEniN3GdWwSQkyLKni?= =?us-ascii?Q?cftF7+VkVUAmzK6AfYVrN9m0m0slfbOLD+y6WeOqHl2CaI12hqKLfJjME2T/?= =?us-ascii?Q?D8jvktDbVS0l40Tb0cJ42Vc+a2gEc6Qxz5canOHcgG1HZnrcns7s0QiXy53i?= =?us-ascii?Q?KaphKi3WcJNiyu7tUV/UtzbvvcxsdRUZFrnkM/ftVlFOrE9Cjgh12J28qK8w?= =?us-ascii?Q?ec3YQttiQOisI+gz7gM07Qc24ZpdVZFqckUVyeN5PvoshMTXRSMCGf7ZE2dZ?= =?us-ascii?Q?7Oos5NfiS6QnxxIjjolZe86awPEEJiwyrn6NbCTX5l/+Ygvm6/YHJJ+n/LWg?= =?us-ascii?Q?kavc9r9za7aVCdK1rUaAkt+5WQcZYbZf+KnsFmlvstTgRmfHgpCnGvl0nQDN?= =?us-ascii?Q?6Wuryhjk5vfxbL/r3Et1+jbve+H3fAT6UeCABzWLA/q27FrMFeEOqzOgNQSr?= =?us-ascii?Q?tOeTeFuYuz6rqXD7ULxdATDdtiAGL7Fqm/ydWzjKgCG2S3coGtOgca3FaX5/?= =?us-ascii?Q?1m4ppVletNcsRRuZyxxPNDZE4D3Tm8u5rZTZv8Z8DFIuKYexkucKEHzEw879?= =?us-ascii?Q?d01tLqRL6Nfkc3wXmbUS96l+VahOv6HIGRVzk79W+QHSjd06VxkWBIdz1ik6?= =?us-ascii?Q?Uf9fV2a3Mio4M2T3/PqiAfxtNk2PpusxGngfbEiBsFd4AdVOFHcn/yutHfiG?= =?us-ascii?Q?aAlu8nnz2E+cALpU+HeHgr7N+R4EwQpjqagek+7X8aMjn9mwpQ/1vuTAsssb?= =?us-ascii?Q?kPKrQA6j3ClyrkQIap1EcUz1l78ad06TnKzurTXvTdVAqlXCFZUNaMm7w4yj?= =?us-ascii?Q?dWbfFvFuCmxGccl7bPX/5wBO8myRxnnLth+S?= 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)(376014)(7416014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 May 2025 18:08:05.8391 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5f56261f-7834-4720-4a06-08dd9e12986d 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: MN1PEPF0000ECD4.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4492 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250528_110813_085646_BC96EB43 X-CRM114-Status: GOOD ( 10.98 ) 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 Wed, May 28, 2025 at 02:08:45PM -0300, Jason Gunthorpe wrote: > Fundamentally this is supporting accesses that don't have an unmap op > callback. Ah, I see. > It could be done differently, with the below just create your access > with a null ops. Prevent mdev drivers from doing this when they create > their accesses. We don't need to optimize this failure case so it is > fine to scan the xarray. All we really need to do here is eliminate > the WARN_ON. Yes. That approach looks much cleaner. Will replace the iopt_pin_pages patch. Thanks Nicolin