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Thu, 2 Jul 2026 20:32:46 -0700 Date: Thu, 2 Jul 2026 20:32:44 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Pranjal Shrivastava , Mostafa Saleh , , , , , , , , , , , , Subject: Re: [PATCH rc v7 0/7] iommu/arm-smmu-v3: Fix device crash on kdump kernel Message-ID: References: <20260630185942.GF7481@nvidia.com> <20260702144157.GM7481@nvidia.com> <20260702235004.GN7481@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: <20260702235004.GN7481@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF00004FBA:EE_|MW6PR12MB9017:EE_ X-MS-Office365-Filtering-Correlation-Id: b108d771-4945-4269-d5e8-08ded8b3c92b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|82310400026|36860700016|23010399003|22082099003|18002099003|3023799007|4143699003|11063799006|56012099006|6133799003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 4RsEbRuAliww7B6JkmeEWD85YJ+Cw1Gg4odp7UUNd1kafcALfrw/xt4N7l0R1h99lEeRgkMl9iudZCuwsGiZWLWXFHZLEVrK3r8MNemAaa/fS9PzZolaQGFLnEov4nPf/WzXQYoLPeArq0o4YpSWg03F8o5HAUGzXRozLblBnX7tPmZNNu7Ii83ly5//yU/GRoOEZAVU5AuKhMMQWrBIVP/OFmKdpLcXPrWJmHQ6Mioqj+ICish+yiSyKTsXQ3eBdzpHXxWxO7+UVGcGMBeaT5twBjWOyUMvgkDHfMzKlxPjb4E3L5k4qnqFxwS5YiInPPJ1eA2yrvZ8TA0MzH7MWoy+xs6IBGWoGx1gK++F7/Ev9YTcDQA4v9l/VDyFUJo4jGGtKWYWDNnUozijX/ZrULEST2Autwn1uu5dlCez95w93qM+uyB/EOPPWuR+KwGx X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jul 2026 03:33:01.7061 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b108d771-4945-4269-d5e8-08ded8b3c92b 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: BN2PEPF00004FBA.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB9017 On Thu, Jul 02, 2026 at 08:50:04PM -0300, Jason Gunthorpe wrote: > On Thu, Jul 02, 2026 at 12:25:43PM -0700, Nicolin Chen wrote: > > On Thu, Jul 02, 2026 at 11:41:57AM -0300, Jason Gunthorpe wrote: > > > The VMIDs that are in-used by the adopted stream table have to be > > > removed from the idr as well (and similarly for ASID if we don't have > > > VMID HW support). > > > > > > Then the VMIDs that may be dirtied by the prior kernel remain isolated > > > and are never re-used by the new kernel. When the new kernel wants to > > > do DMA it will replace the STE with a new, clean VMID, and there is no > > > problem. > > > > I see. I assume the reserved VMID for the kdump kernel will be a > > clean VMID (!=0). That should guarantee different cache tags. > > You will also have to change things to allocate the kernel global vmid > from the IDR, it will usually be 0 but not for kdump. Then you have to > find all the places where the 0 is implicitly placed and put in the > actual value. Hmm, I just realized that all the EL2 commands do not take VMID. Looks like we have no choice but to scan through all the CDs for the ASID too.. Nicolin