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Wed, 9 Jul 2025 11:55:21 -0700 Date: Wed, 9 Jul 2025 11:55:20 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v8 14/29] iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC ioctl Message-ID: References: <49a93d92ce657cf6a0d588d2b31ad3600ace21f7.1751677708.git.nicolinc@nvidia.com> <20250709170904.GG1599700@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20250709170904.GG1599700@nvidia.com> X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001EC:EE_|PH8PR12MB6985:EE_ X-MS-Office365-Filtering-Correlation-Id: d000da8e-7d78-46f1-a1f5-08ddbf1a2ed0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|376014|7416014|1800799024|82310400026; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?UN98EhLKckUlMt40PlMe5saHyhsP6rlOTNyTy0DSSk5YNqgoZSWnOMWpr8lw?= =?us-ascii?Q?wAXSgPIT7Jd+o7RgTvrmfJoG9sMXe8QZVj8oEtIVou1BCu1BBXgiT3T3C4/b?= =?us-ascii?Q?gO3tckKIxwIAek9TMm/aBozah87dsmbmefVUb7DSuA00RYZg0NNNcOgq8rMF?= =?us-ascii?Q?SjSARdR4KZVz7IqbL/iMvR4NsBn86QgUS8d99pHYXTaAenwgds+WityhtoD8?= =?us-ascii?Q?gal/X+Oz0ElCPixPKNL9ZJNv/GB3pECf9byV5jGjQEgAPAiBdAKCYBq46VDr?= =?us-ascii?Q?3uoLbM4vXscR+9/uE3CjRbmaVI8Glm4isIzSurjS4Ut+ShPck+txTMiE9Zd9?= =?us-ascii?Q?SOZn4DXZiOYLvT8xoqC/Oby8EIUqB19BpLdZhhcVKeRXrYewYTusluE3IbQD?= =?us-ascii?Q?lXYPFI57qurNsD1HaD5LUIweiMr8+ynFchGIXFFOvQuEkQIGhF3KwxDrXl67?= =?us-ascii?Q?ZAHVjWu5fxq5GBaN2IOhYPmzXlvlAidAQkRpA6GZaFimRoovrWMOuK1gua/L?= =?us-ascii?Q?h2ns1B+IQ9ltVMD7dZR6u0TCiXjleGCiCo1YKaDmH7lII8lVjsdAoZQOghNo?= =?us-ascii?Q?oCgSmZCxtjIZctDqneaG4+qiLkqjGMGlZNaStBBvBPVSHBspjXta+yvfVMJS?= =?us-ascii?Q?gpk+Z4snBkGpsjAiwLLZIAR3sg3X2OzKjhJohfQ+84l6CTulrTZ5OrwKOgen?= =?us-ascii?Q?qyKLf5RTAKqd+pX8owopcNyAVjfgnm1fdTsMh1eM/5o5ChymZ+/shyh9Ezkg?= =?us-ascii?Q?q6ROpFCfBl6hlB7yuKM01OTs8eicozg7TLYK8m0BWi7Oen1cp1tX31yAp7YD?= =?us-ascii?Q?LqRKsNJ5CYG3hiQPH5PUXtbbGQKsC+YM74vh+rcgN040Qd4q36WBEEZFg0/u?= =?us-ascii?Q?off44wGriFJIaWfoA8HqBmm3edQO2D0+4x47GK9yQ8t9cPt6zH6eUvsFBbt4?= =?us-ascii?Q?aDS525ouAKqYAupYEzgHUga1Qc0LhcH3WiO3VoJAHOq/ggcK7gGXIKxCyurl?= =?us-ascii?Q?tAcERnCon98lpfIvr1S+r5AqgyOeKCAwpUEB6efohXBRuV9usBMrUFLTv/Yv?= =?us-ascii?Q?3sUvjHEgSCUXhGd/XwsiTyWsYldfzfJY8EruVtz4NLdHbkHH1MBDRNV8UrFZ?= =?us-ascii?Q?tW3ayVOQVsRB/YfL94Z8KO2sOzYmfJQPVczv+VcX+BPlWVuodxLdh7eKIgu4?= =?us-ascii?Q?Fk7yUrKmBmwjX/h/REYnx1X+19Em/BPnCphxSwzcos2d/ocrIUnZZMaNTAJb?= =?us-ascii?Q?wCi2tpy5OVDMw0PqwkX172UdrKQCJZW9ggX1rb/kmyYkl+wb2Gdu2fXcNJ36?= =?us-ascii?Q?03oRrEKbiEimaWtTD3peMIF10VRMSFp+BBMh2zxXxtLSyCkvdMwZc3pRK4AE?= =?us-ascii?Q?gC22askic9SsgTl12/aU+La3bHInDU8QdMHrsePYu+pfiLogfA+s55PL0ipz?= =?us-ascii?Q?wfX7IJ/i9m1GU9lfWDud23qWuvZPZMeOgMQYgcWibr1fQMXfoOhh5lDBD1k/?= =?us-ascii?Q?CNyJNyzuHJAkk3TXRced1i2be+GLj/mPzx5z?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(36860700013)(376014)(7416014)(1800799024)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jul 2025 18:55:33.1639 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d000da8e-7d78-46f1-a1f5-08ddbf1a2ed0 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001EC.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB6985 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250709_115541_290562_66C76672 X-CRM114-Status: GOOD ( 11.99 ) 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, Jul 09, 2025 at 02:09:04PM -0300, Jason Gunthorpe wrote: > On Fri, Jul 04, 2025 at 06:13:30PM -0700, Nicolin Chen wrote: > > +static struct iommufd_access * > > +iommufd_hw_queue_alloc_phys(struct iommu_hw_queue_alloc *cmd, > > + struct iommufd_viommu *viommu, phys_addr_t *base_pa) > > +{ > > + struct iommufd_access *access; > > + struct page **pages; > > + size_t max_npages; > > + size_t length; > > + u64 offset; > > + size_t i; > > + int rc; > > + > > + offset = > > + cmd->nesting_parent_iova - PAGE_ALIGN(cmd->nesting_parent_iova); > > PAGE_ALIGN is ALIGN UP, that is the wrong direction? > > It is just: > > offset = cmd->nesting_parent_iova % PAGE_SIZE; > > And this is missing: > > *base_pa = (page_to_pfn(pages[0]) << PAGE_SHIFT) + offset; > > ?? Yes, my bad. And I realized that all my testings are page aligned. Maybe we could add an IOMMU_TEST_OP_HW_QUEUE_CHECK_ADDR.. Thanks Nicolin