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Mon, 23 Mar 2026 13:18:06 -0700 Date: Mon, 23 Mar 2026 13:18:04 -0700 From: Nicolin Chen To: , CC: , , , , , , Subject: Re: [PATCH rc v3] iommu: Fix nested pci_dev_reset_iommu_prepare/done() Message-ID: References: <20260321223930.10836-1-nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260321223930.10836-1-nicolinc@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECDB:EE_|MN0PR12MB6003:EE_ X-MS-Office365-Filtering-Correlation-Id: 60f5a710-2d2c-4596-5003-08de891957c9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|36860700016|1800799024|82310400026|18002099003|56012099003|22082099003; X-Microsoft-Antispam-Message-Info: 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 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)(36860700016)(1800799024)(82310400026)(18002099003)(56012099003)(22082099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: vxhKFa5rE8KF5DcnqMY565/+ACfC1HBE7SbmYGOQqwpaFNFSBcP2QBInudhQHBFehv4ecAv6m/pujlh2GiuNaRAH6H5KwxYkD3flDyAkn03Kmxzqt92eSjAgso15p3MHmEKdxJif6iNUOFHQKEvpTt+qCsSQOlv79o+7ghNYI2b8aiHs/ThE+Lr3Ll6v7RzPCdhs7Tkdx80yEVKRQUXD1Nmku7LThtrYCtKkjWIdcR8peKGQ2mzIKCsm5xdn+jAbakRsX/2qW1T+XjuF04x8m13OLBt+svjyD+QOix5jQ7cctVW/nqt61FpKwAzLFwpeGYRV5JS2/CccNpUzFwdj6V0LfKK7z6L5/dujn+OvMFdvk+eC6xmyaMXFy0vOLXW8ceoWrc2CH5kmU9I1zTI5N4txZiORAsgod7GloTe+O1wnsCyOo48owCAmNuZy/Bo3 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Mar 2026 20:18:27.1302 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 60f5a710-2d2c-4596-5003-08de891957c9 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: MN1PEPF0000ECDB.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR12MB6003 On Sat, Mar 21, 2026 at 03:39:30PM -0700, Nicolin Chen wrote: > @@ -61,14 +61,14 @@ struct iommu_group { > int id; > struct iommu_domain *default_domain; > struct iommu_domain *blocking_domain; > - /* > - * During a group device reset, @resetting_domain points to the physical > - * domain, while @domain points to the attached domain before the reset. > - */ > - struct iommu_domain *resetting_domain; > struct iommu_domain *domain; > struct list_head entry; > unsigned int owner_cnt; > + /* > + * During a group device reset, @group is attached to @blocking_domain, > + * while its @domain points to the attached domain before the reset. > + */ > + unsigned int reset_cnt; I found an issue in the sequent gdev-quarantine series. To fix that, we would end up with two counters in the iommu_group, which could be merged if it was named properly in the first place. So, I plan to rename this 'reset_cnt' to: + /* + * Number of devices in the group undergoing or awaiting recovery. + * If non-zero, concurrent domain attachments are rejected. + */ + unsigned int recovery_cnt; I will respin a v4 shortly with the renaming. Thanks Nicolin