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Mon, 25 May 2026 12:42:22 -0700 Date: Mon, 25 May 2026 12:42:21 -0700 From: Nicolin Chen To: Pranjal Shrivastava CC: , , , , "Joerg Roedel" , Will Deacon , Bjorn Helgaas , David Woodhouse , Lu Baolu , Robin Murphy , "Suravee Suthikulpanit" , Jason Gunthorpe , David Matlack , Samiullah Khawaja , Daniel Mentz , Pasha Tatashin , Mostafa Saleh , "Jason Gunthorpe" Subject: Re: [PATCH v4 1/5] PCI/ATS: Ensure pci_ats_supported() is PF-aware for VFs Message-ID: References: <20260525184347.4059549-1-praan@google.com> <20260525184347.4059549-2-praan@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20260525184347.4059549-2-praan@google.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN2PEPF000055DD:EE_|DM4PR12MB6325:EE_ X-MS-Office365-Filtering-Correlation-Id: 35206d1d-1177-4ddb-143c-08deba95c621 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|7416014|376014|1800799024|18002099003|56012099003|22082099003|6133799003|11063799006|4143699003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 07gVdphXsbJ8+wn7ARjmZLRnuUlN5geHRT5tC08md0VTHbvTVsbtAEYmst2iCMKLixmxXTr07gMrWhwDqhhDXUef8WnZt79/8P/TgyI7v0/Nz/L1QTraW8J8QkdTNqT3TwJvT4cHjJEn5W2RGUWbCYh6d7T85GbbD5C1ZaJRSVEb6LvpnUU/N8XvkXWG3wMzUMDsZ08eIyl0kkENetg1subwGIjzAOFZOFLtjFqysF2DN8IuvLkbkoKORt3CppjvEs7Qy+f3nc8qFqYYS/UyYkHHRzIHWPS0Ng3OGd40+43s6M6cWs+ERMb/CxbQIETFVikTYnnSa/LqRQVxfZHhQ1y3i4aio3l+Hmaw2Qym7uXNIeSpo3E1kAjHRQ3iaSnFvzU6KSuGQ5yHrTtOdetcYUH5kU7GqYq3D9tc+aspyrUrirccYdsRfpuvZRiljmQ5 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2026 19:42:36.8328 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 35206d1d-1177-4ddb-143c-08deba95c621 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: BN2PEPF000055DD.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6325 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260525_124247_778130_06D99989 X-CRM114-Status: GOOD ( 10.41 ) 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 Mon, May 25, 2026 at 06:43:43PM +0000, Pranjal Shrivastava wrote: > Update pci_ats_supported() to additionally check the associated PF's > status when called on a VF. This ensures that PF-level quirks and > untrusted status are correctly propagated to VFs, providing a robust > support check that aligns with the kernel's PF-centric ATS configuration > model and is immune to the timing of VF-specific fixups. > > Reviewed-by: Jason Gunthorpe > Reviewed-by: Samiullah Khawaja > Signed-off-by: Pranjal Shrivastava Reviewed-by: Nicolin Chen