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Mon, 23 Mar 2026 18:30:13 -0700 Received: from Asurada-Nvidia (10.127.8.13) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20 via Frontend Transport; Mon, 23 Mar 2026 18:30:12 -0700 Date: Mon, 23 Mar 2026 18:30:11 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: "Tian, Kevin" , "will@kernel.org" , "robin.murphy@arm.com" , "joro@8bytes.org" , "bhelgaas@google.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: <20260324000321.GX7340@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; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: XHKk2FQ/LH0m+z9floZCO9Tjkz1zIcQimHyItUUfE4Ean3iw0e0Og7aOxzBGXG/QdIGM2QQl8wpInTyfjj3QD+PKsjWTJEGdLf4CnaHtn9a2aeDBUFzJ4xNetOT8PpROcg+2GPvDDLyi5pvv+0vllb8tV+pZ4eCvsZtdGTS12MWIEtT3teBUvPrRoUYNM0BtydvIqiGmCvl+d8tq5sxMBiTGfbsUPKLrApEFvkrAHn/XP9POhNSHVIE302cIDcNeBX/+neWzUPPiSDineQVBlJ34cjkdVqm2yLNq5vZbW3af7w56Zase1cn04YjmkNbAUubwZwCWs340weSk3HIVdnQknE1W47kIrdb240vG1LaWrYy+Dbgqg4fvzk1ss8swzIak2Pg4fyZJbTrvYebDIF5btQ9lJxgKMz3donV4L4Wf8MuLl7rwQ70jRtcf7JQP X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Mar 2026 01:30:32.2947 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 09c25311-3dba-4be7-f45e-08de8944f0d9 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: BN3PEPF0000B073.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW3PR12MB4443 On Mon, Mar 23, 2026 at 09:03:21PM -0300, Jason Gunthorpe wrote: > On Wed, Mar 18, 2026 at 08:10:01PM -0700, Nicolin Chen wrote: > > 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? > > I think this is more of a feature (RAS support for SMMUv3) than a > specific fix. Adding that to the cover-letter. Thanks for the input. Nicolin