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Wed, 18 Mar 2026 20:10:02 -0700 Date: Wed, 18 Mar 2026 20:10:01 -0700 From: Nicolin Chen To: "Tian, Kevin" CC: "will@kernel.org" , "robin.murphy@arm.com" , "joro@8bytes.org" , "bhelgaas@google.com" , "jgg@nvidia.com" , "rafael@kernel.org" , "lenb@kernel.org" , "praan@google.com" , "baolu.lu@linux.intel.com" , "xueshuai@linux.alibaba.com" , "linux-arm-kernel@lists.infradead.org" , "iommu@lists.linux.dev" , "linux-kernel@vger.kernel.org" , "linux-acpi@vger.kernel.org" , "linux-pci@vger.kernel.org" , Vikram Sethi Subject: Re: [PATCH v2 0/7] iommu/arm-smmu-v3: Quarantine device upon ATC invalidation timeout Message-ID: References: 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: CH1PEPF0000AD81:EE_|MW4PR12MB7311:EE_ X-MS-Office365-Filtering-Correlation-Id: d119fd8e-55b7-4c93-dc0c-08de85650ccd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|82310400026|36860700016|18002099003|22082099003|56012099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 0s9C57b60BAW5DHzywEmatt1L9Yxwp5ivuuyFPj6KNI5q4EZCf7llshIFD5Q4H0iExm/aMuCJZHxTtZDf7RCg0kbBBUq2wNyVdOdojdUhtrbDVuGelTxI4aRA2UnhiIP8/0AYq8BePIZT3whbHKUuDiJCZ/QPjZtnj3vjYiKgupgpWPmopyF1IRR0QHRQYN04CgX2zx0Agt3yhJY4JNF5InJfl+HSU1vT7puZdE8AlABrANqlmag2SYDqsAdLioXrfS4tqBhjuqFAIUYRylTv+VmVZmzI6HX4aERtpR7LjE09krs4zNGQQpAXDfG3Yes+O/tOxEZ9mn9OrR0nqRseGdk7VGEFD8Nk8X1oH7ldeeDxD1LEt5g7GypoNXu73l8FdypRYwEnuTbIZYfU73i+WYeaqcqBWWJL/LVoYBIafCVMvxsVKPTPQlOldVU3T/T X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Mar 2026 03:10:18.4863 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d119fd8e-55b7-4c93-dc0c-08de85650ccd 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: CH1PEPF0000AD81.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7311 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260318_201027_395767_79F1F5AA X-CRM114-Status: GOOD ( 13.51 ) 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 Thu, Mar 19, 2026 at 02:29:38AM +0000, Tian, Kevin wrote: > > > > This series addresses a critical vulnerability and stability issue where an > > > > unresponsive PCIe device failing to process ATC (Address Translation > > Cache) > > > > invalidation requests leads to silent data corruption and continuous > > SMMU > > > > CMDQ error spam. > > > > > > > > > > None of the patches in this series contains a Fixed tag and cc stable. > > > > Hmm, I guess AI overly polished the cover letter so it sounds too > > strong? > > > > This is essentially a vulnerability (potential memory corruption). > > And none of these patches actually fixes any regression. The PATCH > > 7 even requires the arm_smmu_invs series which has not been merged > > yet :-/ > > > > Fixes tag and backporting are not just for regression. People certainly > want to see reported vulnerabilities fixed in stable kernels... Well, maybe I'll just leave additional line telling people that this can't be a bug "fix" because it's written on another unmerged series? Nicolin