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Fri, 3 Jul 2026 00:09:01 -0700 Date: Fri, 3 Jul 2026 00:08:59 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: Jason Gunthorpe , Will Deacon , "Robin Murphy" , "joro@8bytes.org" , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v1 3/3] iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@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: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF00005FFD:EE_|LV2PR12MB5989:EE_ X-MS-Office365-Filtering-Correlation-Id: 81f41c58-a3b1-48ea-e0a6-08ded8d20188 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|1800799024|23010399003|36860700016|22082099003|18002099003|4143699003|11063799006|56012099006; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Tu8zzAD0+17D62RczBbiOmQe4e5ErhbWIWstTRw2KGRBxpeHpanqcnaBBPcBSfDQHOyt9e1/6ODig0NcpaOfhMSbDAlNTohXNneGNIyoK+bAGLxi6XkstYrZjnArX8B6UpFI+roLSE0lYG4BovI5wCBO2mbZqWsPgrLggaGO29uD7v1WPfYbg66ZhC0UYbgMhEMQNIRIvctXsC3azd/Z564X7qocMc75kp8Gcxj+3x54CispsVmgJT+fbTsD855UG5JnDCKKytyfu/FsaAoQOfpVo0rSRHBfATmZOmoNjrvs06rNm2a8vJai/jZNqpvFFE4SfS4CAk8U3Fdgfat74kaWWt5dYfGL9W6M+8B1l6uen1Mu3N/hXxBg9iCtcbfBw2o1UK/73RIj/22H8IUJB8YbDPxJBRHhXPiyDFQc66wIxrMXeXObta2a8wjYljH3 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jul 2026 07:09:21.1631 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81f41c58-a3b1-48ea-e0a6-08ded8d20188 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: BN1PEPF00005FFD.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5989 On Fri, Jul 03, 2026 at 06:40:22AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Tuesday, June 30, 2026 5:16 AM > > } > > > > +static int arm_vsmmu_vdevice_init(struct iommufd_vdevice *vdev) > > +{ > > + struct device *dev = iommufd_vdevice_to_device(vdev); > > + struct arm_smmu_master *master = dev_iommu_priv_get(dev); > > + > > + /* > > + * arm_vsmmu_vsid_to_sid() maps a vSID to master->streams[0] > > alone, so > > + * more streams would leave the rest stale and none reads out of > > bounds. > > + */ > > + if (master->num_streams != 1) > > + return -EINVAL; > > + return 0; > > +} > > - EOPNOTSUPP, given the comment seems to indicate it as a current > limitation hence may be removed in future? otherwise with -EINVAL > this may be documented somewhere to get attention from userspace. OK. I will change it and other places too. Thanks Nicolin