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Sat, 9 May 2026 00:44:53 -0700 Date: Sat, 9 May 2026 00:44:49 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "will@kernel.org" , "robin.murphy@arm.com" , "jgg@nvidia.com" , "joro@8bytes.org" , "praan@google.com" , "kees@kernel.org" , "baolu.lu@linux.intel.com" , "miko.lenczewski@arm.com" , "smostafa@google.com" , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" , "jamien@nvidia.com" Subject: Re: [PATCH rc v4 3/5] iommu/arm-smmu-v3: Skip EVTQ/PRIQ setup in kdump kernel Message-ID: References: <25398d02373e7592d0555e7da9dbf33b3e83983a.1777446969.git.nicolinc@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL6PEPF00022574:EE_|BY5PR12MB4243:EE_ X-MS-Office365-Filtering-Correlation-Id: 8de808ab-2622-41e7-2206-08dead9ee27b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|376014|7416014|82310400026|1800799024|56012099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: KjmI/EYjZY1hj2bn3lbT9NUpEsqcV0yMWw1EdVPKbEvomisUB2U933b5dWWWi/Z2muebKozrShN7phUwcrhpguxzG7o32DPSMdIykhivEffebIfrdMlyQYkFnHZAyMINEZW0z4wgmBZTY1uO7uSRWxzU0OlvM1A65wFo4846KfPFNGhSn7Z2Tfg1lJ5SCd99jHMvJSRvGKaKHwQHEDy4Sxqm+38/mubvMJsN3XWT88Xfw/rLxw3rG2ymbNQiVahojJkSQJ3itXfklzkSi3cZRxGM9pHwu6DvT+BATkI0z5xgaavTBu7DiWL7OANZgyEDJkU8k3BZ58sUJ85gIEP7BLwgWrw4GtqZsjoi6k8Ty5wx+TUWh1tEvcnX2/z+y8DM/RNa5MGmUOOq7XyvJQ/QvqiiMGKIutzCLeAhK7ZB1okoPFpsvtE+ppRY37kTbpse X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2026 07:45:04.7602 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8de808ab-2622-41e7-2206-08dead9ee27b 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: BL6PEPF00022574.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4243 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260509_004514_299358_A2B2510F X-CRM114-Status: GOOD ( 11.13 ) 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 Fri, May 08, 2026 at 07:41:20AM +0000, Tian, Kevin wrote: > > From: Nicolin Chen > > Sent: Wednesday, April 29, 2026 3:21 PM > > > > In kdump cases, the crashed kernel's CDs and page tables can be corrupted, > > which could trigger event spamming. Also, we cannot serve page requests. > > > > Skip the EVTQ/PRIQ setup entirely rather than enabling then disabling them. > > this is a refactoring to achieve the same goal as before... > > > > > Skip the IRQ setup and guard their thread functions as well. > > ... while this sounds a new enforcement (then better in a separate patch?) In v5, I split it into two patches and kept your Reviewed-by: - iommu/arm-smmu-v3: Skip EVTQ/PRIQ setup in kdump kernel - iommu/arm-smmu-v3: Suppress EVTQ/PRIQ events in kdump kernel Thanks Nicolin