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Wed, 28 Oct 2026 11:09:02 -0700 Received: from nvidia.com (10.127.8.9) by mail.nvidia.com (10.126.190.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.56 via Frontend Transport; Wed, 28 Oct 2026 11:08:58 -0700 Date: Wed, 28 Oct 2026 11:08:56 -0700 From: Nicolin Chen To: Shameer Kolothum Thodi CC: Jason Gunthorpe , Catalin Marinas , Will Deacon , "joro@8bytes.org" , Robin Murphy , "rafael@kernel.org" , Danilo Krummrich , Marek Szyprowski , "aneesh.kumar@kernel.org" , Mark Rutland , "Greg Kroah-Hartman" , Suzuki K Poulose , Gavin Shan , Vikram Sethi , Anshuman Khandual , "Shanker Donthineni" , Mostafa Saleh , "rppt@kernel.org" , Thomas Huth , "Marc Zyngier" , Ryan Roberts , "kas@kernel.org" , Kohei Enju , Shaopeng Tan , Ard Biesheuvel , James Morse , Steven Price , Sang-Heon Jeon , Omar Sandoval , Andrew Morton , Jinjie Ruan , Sam Edwards , Douglas Anderson , Florian Fainelli , Chen-Yu Tsai , Huacai Chen , Thomas Zimmermann , Pranjal Shrivastava , Ashish Mhetre , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "iommu@lists.linux.dev" , "driver-core@lists.linux.dev" , Sonang Patel , "Ankit Agrawal" Subject: Re: [PATCH v1 8/8] iommu/arm-smmu-v3: Probe a guest-level Realm VSMMU via RSI commands Message-ID: References: X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 2yYL48xMuK3Z8di4InucGnEZzOP5RFjtKaz9hBWg2v2gXSC3qQEOLiWGRKE5IFuBy+WybWCXeE8RS16EFVKKz+SPv8PnMYxgjywKllUEHg2PIp5G1Y0fBkpUER7dS++YB3Q14qLWt1sTomBKZ4JM0JJiWqYaXxwuVxpiBHlUFtKCyP37NOQoVDuUiAhoFjqC+17nIi6NYen0Eylb8dv38asc+/E1tZGlt/so5FU72YRlynAUaIlUw+4ma9tQm5JEmWicGurtVvFZsIbakg23dIC55SsfHt45uwB5nrqDTYz8vtvBb1ktHKGlfyjRrQa24jwpxK16+prxiUhg1Ks/EIk4SHkS1tK9M/Vuc+dRYQ5jGXHwhdW7PiAc4KTPHCPLbpBTj3Pu1eF8KLgnrm5mKNAip5nP5yn3EZVk+Hzi2lw1CAZ9dgt5xZYSdkFUWE+h X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 28 Oct 2026 18:09:26.6731 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 361bcd94-ace0-4b4b-89d3-08df351e9a8e 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: BN6PEPF00000075.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB9116 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261028_110942_128127_82EE4497 X-CRM114-Status: GOOD ( 12.99 ) X-Spam-Score: -2.1 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Oct 28, 2026 at 08:41:13AM -0700, Shameer Kolothum Thodi wrote: > > @@ -5542,6 +5591,12 @@ static int arm_smmu_device_probe(struct > > platform_device *pdev) > > } > > ioaddr = res->start; > > > > + if (is_realm_world()) { > > + ret = arm_smmu_probe_realm_vsmmu(smmu, res); > > + if (ret) > > + return ret; > > + } > > If probe fails after activation succeeds above, wouldn't a module > reload hit RSI_ERROR_DEVICE since the VSMMU is still ACTIVE? > > B5.4.1.2: > > pre: vsmmu.state == VSMMU_ACTIVE > post: result == RSI_ERROR_DEVICE > > How is recovery handled? There is no way to undo an activation. But what's the practical use case for the SMMU driver to do a module reload? Nicolin