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Tue, 1 Jul 2025 15:07:58 -0700 Date: Tue, 1 Jul 2025 15:07:57 -0700 From: Nicolin Chen To: Pranjal Shrivastava CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v7 27/28] iommu/tegra241-cmdqv: Add user-space use support Message-ID: References: <539ee2ec112162abdba511574e2205a77b425059.1750966133.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@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: X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000142:EE_|LV3PR12MB9409:EE_ X-MS-Office365-Filtering-Correlation-Id: 712baad7-1c79-4388-a217-08ddb8ebc2ab X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|1800799024|7416014|376014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?6ocs7rckttIK6PmTEfsnhxwdOQoNdKm9HIV7g2ip2vaKdGt9JQCj1OghE2qN?= =?us-ascii?Q?wS0k1goXWDCXKMz59UJpSddV4DJNMDSeQ+rrCilCJyZhFs9pSmsfy01LadYM?= =?us-ascii?Q?ZMGx76Wja/x3RGU/a1hArZbK9qvvA5S2LZMuqWPRj4Ma0Q3fw84SszvMzb9O?= =?us-ascii?Q?GAkn0CXQHuXBjgz8IGzN36Y8vMscmY3bRDgH7v1aD5uN/GEsI/Gt4PFX8pHV?= =?us-ascii?Q?+/ejFxJtm6/Aj3pK3kLlodex5NgoM8Qw/l8e3oEggqFjS7fyQZ0p9lFj3ku4?= =?us-ascii?Q?nR3UdkUblgYd0IN8poZ2HQzMYhLDbq8soEgsr8ef94cLfhVYYkR1eePx1n+3?= =?us-ascii?Q?NYI7ieQmhI4Z1JN5xmryysOrl5UI/xm5SqsUoAWJZ32sStK5l1+J1m8HqTlS?= =?us-ascii?Q?VvP7Qua+p364gcUT7SSX+MkpXuzcfnH/YXQarl1NieimoJo/vL2KmuuErhZ9?= =?us-ascii?Q?YHndcHceb5/LFUlQUOhXv+3G8UASnrYR3N7pKfk0t3HNtrrOx8n1ah9XSdKE?= =?us-ascii?Q?3QtHYu0Z8clc/r3HONpp0V8Md/YZtU48jyEM9StCgvH2RTpkk/O6eu8vrkaj?= =?us-ascii?Q?jpRRBRIKZsZ8vPoLEGjjJ/bzuhniKhxbzSy/U9BR3h1/brsn8mlqoVF0E9+M?= =?us-ascii?Q?Ctpa1d0LU3D+AZSY/tk1sWJqHRCC/PFvs1BMK0hn3sY60/j81xDKRps6dsTl?= =?us-ascii?Q?c9GkyfSc8wlJ0L3fxzH3HQeUgcDcSFogoqhBJzlda/oJpGmhKx0YbBRCI5AS?= =?us-ascii?Q?X+SsgltSFcQzlorBYxWLd6C33dJNvvWmdGFO/EBjYzdPvKVvS5zXE4ehU9GY?= =?us-ascii?Q?GCVA3VlpxJhUCwvlLWzIhYiNp5hqxAJJ/ysWdPKa18d3JvMAueeTPs3Xdi36?= =?us-ascii?Q?VhAOY5JWgH6Wndpt0Fxup2YuaBMsGO/iqIKNZ0ibA2nabU85UsTSrOW+1a6E?= =?us-ascii?Q?E0aAt+yoTblnranHZlSOp6R/+qiRhRSZoA5ODqBoYSG4AMPpBpXXvnaH+dj1?= =?us-ascii?Q?ZjXmqEnZV/mzUI0tnvgUu2mLeeWA3bc0lfQR2x16CH/HGSAv4SjDsOZ8PXYn?= =?us-ascii?Q?dZVOkATZiuJ8IGFYgvfOmJbdMzoul7ahgqt9CUHm8c/wEwXpPPgQmk1z3ADP?= =?us-ascii?Q?rfAZ721o3WGzzWph1JA+JpGHWPyeOosBifjvpH/Qna6LEgyWLhTH688y3iPC?= =?us-ascii?Q?U4hbCiyEac+qNhK36/QOOoBjjrGWQNzuyuCdVUfLa9oriqSLiYYeksgDddl2?= =?us-ascii?Q?cERTMlRdvUVY5rLwmcxakj8gEcJWTtoDE0hdq7n0pgoZmgFinff8hNZz0y/P?= =?us-ascii?Q?uSQM3rYajytiaezvn7cuR6jhixDTu2xm9eYUfop6DXkorczzs4cjGl4MJvKR?= =?us-ascii?Q?q1l6wAec6VAtpkZOX9XA5ZQZ4d6xCmaa3tDgoR4O3Bna3PdZIBKaVbhivd5N?= =?us-ascii?Q?xMKfJinzW/F771TJbT7P2Tkygen6LoxBBwU+Oqc8YDNP6MvyvpYBl7WkMkh7?= =?us-ascii?Q?Bep1PqreX4SHN3Wibo1HLBNxOzo4LuJiqO32?= X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(1800799024)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Jul 2025 22:08:07.8188 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 712baad7-1c79-4388-a217-08ddb8ebc2ab X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CH2PEPF00000142.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV3PR12MB9409 On Tue, Jul 01, 2025 at 08:43:30PM +0000, Pranjal Shrivastava wrote: > On Tue, Jul 01, 2025 at 01:23:17PM -0700, Nicolin Chen wrote: > > Or perhaps calling them "non-accelerated commands" would be nicer. > > Uhh okay, so there'll be a separate driver in the VM issuing invalidation > commands directly to the CMDQV thus we don't see any of it's part here? That's how it works. VM must run a guest-level VCMDQ driver that separates accelerated and non-accelerated commands as it already does: accelerated commands => VCMDQ (HW) non-accelerated commands => SMMU CMDQ (SW) =iommufd=> SMMU CMDQ (HW) Nicolin