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Wed, 16 Sep 2026 11:37:11 -0700 From: To: , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , Subject: [PATCH v5 08/27] vfio/pci: Fall back to plain vfio-pci when CXL init fails Date: Thu, 17 Sep 2026 00:05:21 +0530 Message-ID: <20260916183540.3813685-9-mhonap@nvidia.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20260916183540.3813685-1-mhonap@nvidia.com> References: <20260916183540.3813685-1-mhonap@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail202.nvidia.com (10.129.68.7) To rnnvmail202.nvidia.com (10.129.68.7) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV8PEPF0000006C:EE_|PH0PR12MB8797:EE_ X-MS-Office365-Filtering-Correlation-Id: 11e412c2-fa40-4506-9f64-08df14219f16 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|1800799024|7416014|36860700016|376014|23010399003|921020|10067099003|11063799006|56012099006|18002099003|22082099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: ZSawq8P12N1LaBtphSPqfelHOJwjK8cD7B9y8sk9+tjkHt52JMgoBiPj9MGJnxFoiRsKpUH1QfL6EeZyOD9zDFgLVIlQ9uYvKR9G2y98SzAX+zZmDb4rQBx33X9Do9GkNBZGkhB64evgitV6YU9M8/qRAeXSieJ2QlTk/f1+flnlOO4QBeyjjFJzjnoM/JziPiPkjKS+jOeC92zsYYCXTFr7OSclIUrpenW00Z38H7cvoS6KxFli2UQEr2RV8GCsSjIlVZWYa0F1d3dwJNuZ3OwNBsWApwQGnnu569+C8kmV+1j55++rI/EEbEn5Bs/gRqKbra1QGKgkCLnuSNqklKYp+VE+8H7uZWpAGUiz38jOKE9IqbGXy6xtEGN1XLs5qUHmWGqbC0PdW1wU8GQiidPRg2ihBvfSyoCM/8im+/9T3uaP7JvNV5hwfcU/YQnN X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Sep 2026 18:37:54.3662 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 11e412c2-fa40-4506-9f64-08df14219f16 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: LV8PEPF0000006C.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB8797 From: Manish Honap A CXL Type-2 device is also a valid plain vfio-pci device. If the vfio-cxl provider cannot bring it up as Type-2, failing the bind would regress a device that previously worked as plain vfio-pci. Make a non-deferred CXL init failure non-fatal: log it, drop the provider reference, leave cxl_ops NULL, and continue driving the device as plain vfio-pci. The -EPROBE_DEFER path added earlier still retries rather than falling back. Assisted-by: LLM Signed-off-by: Manish Honap --- drivers/vfio/pci/vfio_pci_core.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c index a63a4f5228b8..9a75c30b67e2 100644 --- a/drivers/vfio/pci/vfio_pci_core.c +++ b/drivers/vfio/pci/vfio_pci_core.c @@ -2271,9 +2271,17 @@ static int vfio_pci_core_cxl_init(struct vfio_pci_core_device *vdev) vfio_pci_put_cxl_ops(ops); return ret; } + /* + * Any other failure is non-fatal: a CXL device that cannot be brought + * up as Type-2 still works as plain vfio-pci, so log and continue + * rather than failing the bind. + */ if (ret) { + pci_warn(vdev->pdev, + "CXL init failed (%d), continuing as plain vfio-pci\n", + ret); vfio_pci_put_cxl_ops(ops); - return ret; + return 0; } vdev->cxl_ops = ops; -- 2.25.1