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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Nov 2025 16:19:10.8788 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6207d0a6-74bf-40e0-7773-08de2d078860 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB76.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7118 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251126_081924_411301_3D406196 X-CRM114-Status: GOOD ( 13.32 ) 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 Hi On 11/26/2025 9:46 PM, Nicolin Chen wrote: > On Wed, Nov 26, 2025 at 06:25:34PM +0530, Srivastava, Dheeraj Kumar wrote: >> On 11/22/2025 7:27 AM, Nicolin Chen wrote: >>> The iommu_deferred_attach() function invokes __iommu_attach_device(), but >>> doesn't hold the group->mutex like other __iommu_attach_device() callers. >>> >>> Though there is no pratical bug being triggered so far, it would be better >>> to apply the same locking to this __iommu_attach_device(), since the IOMMU >>> drivers nowaday are more aware of the group->mutex -- some of them use the >>> iommu_group_mutex_assert() function that could be potentially in the path >>> of an attach_dev callback function invoked by the __iommu_attach_device(). >>> >>> Worth mentioning that the iommu_deferred_attach() will soon need to check >>> group->resetting_domain that must be locked also. >>> >>> Thus, grab the mutex to guard __iommu_attach_device() like other callers. >>> >> >> Tested the series with PCI reset on PFs and VFs, including device >> pass-through to a Linux guest. All scenarios worked as expected. >> >> Tested-by: Dheeraj Kumar Srivastava > > Thanks for testing! > > Yet, this is replying to PATCH-1. So, you might want to reply with > your "Tested-by" tag to PATCH-0 :) > Sure. Thanks Dheeraj > Otherwise, default B4 command might miss your tag in other patches: > > ✗ [PATCH v7 1/5] iommu: Lock group->mutex in iommu_deferred_attach() > + Tested-by: Dheeraj Kumar Srivastava (✓ DKIM/amd.com) > ✗ [PATCH v7 2/5] iommu: Tidy domain for iommu_setup_dma_ops() > + Reviewed-by: Jason Gunthorpe (✗ DKIM/Nvidia.com) > ✗ [PATCH v7 3/5] iommu: Add iommu_driver_get_domain_for_dev() helper > + Reviewed-by: Jason Gunthorpe (✗ DKIM/Nvidia.com) > ✗ [PATCH v7 4/5] iommu: Introduce pci_dev_reset_iommu_prepare/done() > + Reviewed-by: Jason Gunthorpe (✗ DKIM/Nvidia.com) > ✗ [PATCH v7 5/5] PCI: Suspend iommu function prior to resetting a device > + Reviewed-by: Jason Gunthorpe (✗ DKIM/Nvidia.com) > > Thank you > Nicolin