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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: s0i2F2RLk6FN4xSn7aeNLrnkDE6XpwSfKyjAVIEfoVPq3nS+1awJkL/QpHmdkckwNE7FPZszH4G9gwkcXlHJYxSfEi3EO+7ejXxcKwkdE26MKb2GU5ZMDZmMGboKssyx5cVrD8PuySfqfgXfr9hoLbtxbqalDzda2nu2tCiHXVKMmQmAmWRKc2VAKd/HvaqwnX60FOxuKvDaZ8Xqh3me/FfZBIpJuxFP/KrEg4hJgBW7KpZSNyH8WRoKpyCb8ddleOl5GHkiy/uJJQXMTAk4v42hY/jCxxCvm5Ue0coQeV7/jXVjA+z7oYUB5H2pvFN6emhvYJO2UQQthfy3k/gwMDBL/ziDcfJK2f72M8UlHTuQ4u883/Ik/4gIBbOsIadSl0OPDwnyUlKfsWEHe+zcBBo6DwzkxXhqJev1yh5n3gHjy8AMI8gQHLgsrGfLrlWt X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Nov 2026 22:26:54.2359 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0998d419-047f-43ab-d986-08df41d53890 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: BY1PEPF0001AE19.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5872 X-OriginatorOrg: Nvidia.com On Thu, Nov 12, 2026 at 01:32:36PM +0000, Mostafa Saleh wrote: > On Tue, Nov 10, 2026 at 10:24:58AM -0800, Nicolin Chen wrote: > > On Tue, Nov 10, 2026 at 10:41:27AM +0000, Mostafa Saleh wrote: > > > In Android, in that case, pKVM clears the FW (called pvmfw) that loads > > > the protected VM and authenticate it so any protected VM knows the > > > system is not trusted. This part is not upstream yet. [1] > > > > You might want to double check a dual-SMMU case, where one gets > > accepted by pkvm driver and the other fails and so bound to the > > main driver. > > > > It seems the pkvm driver would still pkvm_iommu_register_driver > > and carry on with an untrusted SMMU. Would it also clear the FW > > and mark the system as not trusted? > > > > That shouldn't be possible, if one SMMU fail the whole thing will > and the driver should clean up after as the probe is done through: > ret = platform_driver_probe(&smmuv3_nesting_driver, smmuv3_nesting_probe); Hmm, if I read __platform_driver_probe correctly: * __driver_attach() doesn't propagate ret from driver_probe_device() via bus_for_each_dev to the caller * bus_for_each_dev(..., is_bound_to_driver) at the end also returns true, as one SMMU is bound to the driver while the other failed ? Nicolin