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Fri, 10 Apr 2026 15:32:50 -0700 Date: Fri, 10 Apr 2026 15:32:48 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , Subject: Re: [PATCH v4 06/10] iommu/arm-smmu-v3: Introduce INV_TYPE_S2_VMID_VSMMU Message-ID: References: <20260409235913.GZ3357077@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260409235913.GZ3357077@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF0000150B:EE_|SJ1PR12MB6337:EE_ X-MS-Office365-Filtering-Correlation-Id: 87ae091c-6ad2-43cd-07be-08de9751215f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700016|7416014|376014|82310400026|3613699012|22082099003|56012099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700016)(7416014)(376014)(82310400026)(3613699012)(22082099003)(56012099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: N09KTfPqgKKL7m2O/QsskQ0Go1ODtVKpNqOI7000gO4ALz6h6Ifq77YDqONX2q6eaZbJt/nROZjwfaeas3/lyNBZb8cjSHbKdqobZXR1V7eIiPClyKmsSxhpbdPeyiaFuW+mLyjVWYyNXf45SRcY4E+rFuY75zNg+hyODN0HOCviHjHUptygrWsBTE9/cTYtZIq0GvpI4ni0Nqc2thkWTNZOiUOtaaVWUNBkEvh1X9Oh/hmn4MV3AOQMf1hpEiyGoLJt3vhBymbBE6Q76vFCkddkzRBch2b2GlD1hyCGEAqM2hk2cnvkJ3k41sW7VJP6BJnGcOdllaoje3Be91OxUm42hJEpLKQnCDdZNOu/jys0IIauKKddKW9kqOIrMdueUtXE2B5g1ZC3h4g6wU7esJ3vsdDLtaiwquHU5gBrqf28NqvwVya+SDGGgF98bbTe X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Apr 2026 22:33:03.9665 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 87ae091c-6ad2-43cd-07be-08de9751215f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF0000150B.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ1PR12MB6337 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260410_153311_722402_313DE490 X-CRM114-Status: GOOD ( 22.65 ) 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 Thu, Apr 09, 2026 at 08:59:13PM -0300, Jason Gunthorpe wrote: > On Thu, Mar 19, 2026 at 12:51:52PM -0700, Nicolin Chen wrote: > > @@ -3246,7 +3248,10 @@ int arm_smmu_find_iotlb_tag(struct iommu_domain *domain, > > tag->type = INV_TYPE_S1_ASID; > > break; > > case ARM_SMMU_DOMAIN_S2: > > - tag->type = INV_TYPE_S2_VMID; > > + if (to_vsmmu(domain)) > > + tag->type = INV_TYPE_S2_VMID_VSMMU; > > + else > > + tag->type = INV_TYPE_S2_VMID; > > break; > > This shouldn't search, the vmid always comes from the vsmmu struct. > > arm_smmu_alloc_iotlb_tag() fixes it after, but the call in > arm_smmu_attach_prepare_invs() should also only be using the > vsmmu->vmid so this is a bug. > > Just set tag->id here and return. Move the tag->smmu up so that is > safe. Yea, I am changing it to this: case ARM_SMMU_DOMAIN_S2: - if (to_vsmmu(domain)) + if (to_vsmmu(domain)) { + /* + * The VMID for a VSMMU must be pre-allocated during + * arm_vsmmu_init(). Return that directly. + */ + WARN_ON(to_vsmmu(domain)->vmid == 0); tag->type = INV_TYPE_S2_VMID_VSMMU; - else - tag->type = INV_TYPE_S2_VMID; + tag->id = to_vsmmu(domain)->vmid; + tag->smmu = smmu; + return 0; + } + tag->type = INV_TYPE_S2_VMID; > > @@ -3357,7 +3369,7 @@ arm_smmu_master_build_invs(struct arm_smmu_master *master, bool ats_enabled, > > return NULL; > > > > /* All the nested S1 ASIDs have to be flushed when S2 parent changes */ > > - if (nesting) { > > + if (tag->type == INV_TYPE_S2_VMID_VSMMU) { > > if (!arm_smmu_master_build_inv(master, > > INV_TYPE_S2_VMID_S1_CLEAR, > > tag->id, IOMMU_NO_PASID, 0)) > > I think this function should not mix nesting and type at the same > time.. > > If INV_TYPE_S2_VMID_VSMMU means the tag is used as a nesting child > then that should also drive the atc decision: > > if (!arm_smmu_master_build_inv( > master, nesting ? INV_TYPE_ATS_FULL : INV_TYPE_ATS, > master->streams[i].id, ssid, 0)) I am dropping the nest_parent and changing the 'nesting' here: - const bool nesting = smmu_domain->nest_parent; + const bool nesting = tag->type == INV_TYPE_S2_VMID_VSMMU; Thanks Nicolin