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Tue, 4 Mar 2025 21:05:11 -0800 From: Nicolin Chen To: , , CC: , , , , Subject: [PATCH v1 4/4] iommu/arm-smmu-v3-iommufd: Allow a shared s2_parent to allocate vSMMU Date: Tue, 4 Mar 2025 21:04:03 -0800 Message-ID: <564eda8dee4bbf4c6e1d1dd9ed6bd40cc1a2df26.1741150594.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000044A9:EE_|DS0PR12MB7654:EE_ X-MS-Office365-Filtering-Correlation-Id: 4d8dd552-195d-413f-a3a5-08dd5ba35741 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|82310400026|1800799024|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?PsWcfjzQHYbqoPXZAhdg291YaL51M/vx0l5vzNbwPJxer2QiSkL4JAcDOAcq?= =?us-ascii?Q?PyU9hzQZwhxA86bpS+vO+cq58QHE22lqrzTqYs30xfHbzWEf2bRMdByvFRfH?= =?us-ascii?Q?hV807KAdr9UqLzE+oB607d7+8QH9b3LSeVa7w32ynwqojQk/vP7XdXShivj2?= =?us-ascii?Q?giGgat7dLhYZG3X4YM5WpXlIvyUsyUlmKhL9jDIlLkOt32jIkG/EPR3/68TD?= =?us-ascii?Q?ntQyChDz080CZUIKnYRWNlw3u1SAStyRJWLYZVmEMKC4KwQu2DHsIVfuP9d4?= =?us-ascii?Q?gK7Ea2BTB/wctEhc+piHMq98vecDERo52aFn2dIiJbrshNXyqeCFpkiQxTBW?= =?us-ascii?Q?tPvPTsA3bi8RcBY7xKSNNdrxbymJAQehelfu4b1/yEDZ0410vAKKEGNDNs9p?= =?us-ascii?Q?wciXNkXX8/qF4PEkzEfTemsBZrI2KDQkpQre36Es3PLnJvIxGWAhy/37Zcnk?= =?us-ascii?Q?m23S/egbEH1j3o8SgDRIfkY7LpSKGVkYKgZXnBmpPY8n5O0hV7sANz0iGcCY?= =?us-ascii?Q?fRhFLwak+SMbz6w8e9A5iuDLqIUTXpzxBZv1bWIwTYg1CyFYE5SLdv+kMyiD?= =?us-ascii?Q?nCORoRbljDngit8nm8WYVmqhkue/D8lEb288bJK4DcgxtQkSu3FDWfw3t1yN?= =?us-ascii?Q?BWdhO/2dp816Nqbf9VA+bBrIipGzjEfGtjp445PzvVeieUju08+HDCZ5X/87?= =?us-ascii?Q?oN53DJOYlW56rY8bBFkjxsiRQuATK32XmVF4+724bKJTpo02g3dLlo6qCgoz?= =?us-ascii?Q?pyi6SZox1MbBt11nCSK1anJQ7kDUMAigSrEc+z9qnIEvtTdyBGEynyLnxMyr?= =?us-ascii?Q?9spCgp2BqpL1ZGJoV7kWdDCPL/+dk5HCVvnTjOOGD2vGoc2G38uyOTXZEq4B?= =?us-ascii?Q?tlaR7h11D9OGOuwRlwML3GnJqSR/vuOg7wG8MAvbH9wWBNaVhUO3Ok3P9zgm?= =?us-ascii?Q?4JJIe/HpWl4en2xKX9DNdtxaIgC2CWOqiG1T3OvduMoM+Taiw43buwElrJa2?= =?us-ascii?Q?Z7SF99tsLtuLd7pV5EnNU2adK4zZL6SrQD8pHTtNCytbzZ7ffLF2Y94Umrfk?= =?us-ascii?Q?apy5EeteYf3gnMH5qU8pQtdOkaJpnp0lS9Nojk4d6uUnQe3P+6dBMyFU4+OZ?= =?us-ascii?Q?dKX2GYvAjn4fe6G9RszvIsfYe0Xv8gntclUR0n4VrWkrb9W340UdhV1sEErI?= =?us-ascii?Q?2HdGxCT/dpcGOhmAZD2GvLti+oGbTx0+W0uAI5oxVbjdFlYExWb21KTE5Pas?= =?us-ascii?Q?U+SaqoeY9y0rUquB/xPe4ZLoXlRlCGk9vkhdo6OewvCDZ6uqVx8xM1Kc8sA6?= =?us-ascii?Q?1bbHdIkojfqkXGKxfaQtk8xFgRCGE14EHSxcAPFylMkpNWemvbyC9eaNZZrZ?= =?us-ascii?Q?QfiXF6Mu28gb66p0OJ7P3/OcqwMw1G5pfo/ZmG5ConCw90PfZ3X5wnbzPdlR?= =?us-ascii?Q?Hsp5dk7GgvLpwwqa6SZzZLA0MrG/9tcXML8dnYTS2dXq2ecuQtHNKwnik7gM?= =?us-ascii?Q?9vBdIsXhvZgTn3g=3D?= 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)(82310400026)(1800799024)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Mar 2025 05:05:25.6163 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4d8dd552-195d-413f-a3a5-08dd5ba35741 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: BN2PEPF000044A9.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7654 Content-Type: text/plain; charset="utf-8" Now, vmids are stored in vSMMU objects. So all vSMMUs assigned to the same VM can share a s2_parent domain. This means a vIOMMU allocation per device behind one SMMU can be given with a s2_parent domain that's allocated per another device behind another SMMU, i.e. s2_parent->smmu !=3D master->smmu. Remove the validation line to allow this use case. Signed-off-by: Nicolin Chen --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/= iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c index 2c5a9d0abed5..9bfa5fa5bafa 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c @@ -378,9 +378,6 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *d= ev, if (!(smmu->features & ARM_SMMU_FEAT_NESTING)) return ERR_PTR(-EOPNOTSUPP); =20 - if (s2_parent->smmu !=3D master->smmu) - return ERR_PTR(-EINVAL); - /* * FORCE_SYNC is not set with FEAT_NESTING. Some study of the exact HW * defect is needed to determine if arm_vsmmu_cache_invalidate() needs --=20 2.43.0