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Thu, 6 Aug 2026 10:22:28 -0700 Date: Thu, 6 Aug 2026 10:22:26 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: Robin Murphy , Will Deacon , "Joerg Roedel (AMD)" , , , , Subject: Re: [PATCH v3] iommu/tegra241-cmdqv: Reject a VCMDQ base above the 48-bit hardware limit Message-ID: References: <20260729220329.805417-1-nicolinc@nvidia.com> <7e66d67a-f63f-465c-acb0-c1238f534c07@arm.com> <20260806140951.GA71449@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: <20260806140951.GA71449@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF0000013E:EE_|DM6PR12MB4401:EE_ X-MS-Office365-Filtering-Correlation-Id: da28f438-9f02-4eaf-20f3-08def3df59bd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700016|23010399003|1800799024|82310400026|376014|11063799006|4143699003|56012099006|10067099003|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: dLgZWk2+fknKTMV0iJYzqhdSKkUL3/wD13c3RThLCVQHU0iVdpgqKPXCeiaNOVRfC9hqYhotmXFwnEBpxbHPUUIJf1hB7Nm/y3FJLdxdJlcgIkWca23/Hct2NMCptinkXog9MRJWbJy5TPVs5KlWpBm7jLGrcebTH7yiHGmedojSOyw8CMYUfvkYJbIWWuTQgwEUegT1RSLX4+bqiFX6S6WJGnaGtSmFTi2T4wBfiTezzwZchFv/37Waq261P+YHIFL6e6mjDIOVC3jz1I+4LzjaPOyk4JtS1KZO+tN3dSq+0iyoSHm+ief905QmvWT9OvOu2sDOI7ht/yNlMxuCc48vvNqw7de/YNZBsoaMoCdUYhe4E2yb5CxmXLe0nx3lfueDfU6x2uAYLzWTU1HakjKt1MESj4XKBIx1ObRNXWnWMoxwv6Y60xcpdaXqBjMM X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Aug 2026 17:22:54.0021 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: da28f438-9f02-4eaf-20f3-08def3df59bd 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: CH2PEPF0000013E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB4401 On Thu, Aug 06, 2026 at 11:09:51AM -0300, Jason Gunthorpe wrote: > On Thu, Aug 06, 2026 at 02:17:31PM +0100, Robin Murphy wrote: > > > But if we really do want to bother sanity-checking emulations, then why > > allow them to still get away with being broken in the case that we do happen > > to allocate queue memory at a sufficiently low PA anyway? Why not actually > > validate smmu->oas itself (plus anything else relevant) in > > __tegra241_cmdqv_probe()? > > Yeah, if the VMM has setup the SMMU so it cannot access all of DRAM > then it is going to be really broken across the entire driver. This > just doesn't work at all. No reason to add any special cases to look > for it only in vcmdq. It sounds that a rejection in __tegra241_cmdqv_probe() wouldn't be necessary either. Let's drop the patch then. Thanks Nicolin