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Wed, 16 Sep 2026 11:38:35 -0700 From: To: , , , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , Subject: [PATCH v5 17/27] vfio/cxl: Own the whole component register BAR Date: Thu, 17 Sep 2026 00:05:30 +0530 Message-ID: <20260916183540.3813685-18-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: SN1PEPF00036F3F:EE_|DSVPR12MB664020:EE_ X-MS-Office365-Filtering-Correlation-Id: ecf3cfb1-7410-4fe7-23b7-08df1421ceac X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700016|7416014|376014|23010399003|1800799024|10067099003|18002099003|22082099003|11063799006|56012099006|921020; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: vxORhvmwvujgx5dMWei3kucZy2vvIBzgnZHwGEUyGwv1ZvHgXvQCDCi3/QbGhDT4I/Zz6odoXt4LytDfWWqdk1MRKo9g/dDW7LzCxyXhO3aW+0Ar0bUKmXPf7XMvmGySO/g4xa5GNgqgZ91GZGHegcXNINmibsLii8kFlJdoh8h0oxGbJjuoTCeh2zGoBBWbr/qPeNjRq0M642QS0h5/6LskCeqDMRLSxYWSeGpGsiyzVKMOMmSFMJXFPCRqymXlMCp5CCcecGdq+dtT4CUCOcmZMqzTGr7C32On1mmpHH+jtXk6o7wdDC9fSgbeuw+BxScbQ6cMhNP6KMV3cVae3nx8wjS9Awj6zOcKRNglRBDiB/U/9DRGiZsDFSnGn4yuIoAGUyu/V+FZvCi2yx1YorIrt9htEtZJ9bUAvGCTTFpSkp6g2z4wWiVq946mwQ6b X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Sep 2026 18:39:14.2219 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ecf3cfb1-7410-4fe7-23b7-08df1421ceac 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: SN1PEPF00036F3F.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DSVPR12MB664020 From: Manish Honap devm_cxl_probe_mem() maps the component registers through the CXL core, which by default claims each HDM and RAS sub-block. That collides with the full-BAR request vfio-pci-core makes when the guest opens the device. After the component registers are discovered, declare the containing BAR owned with cxl_reg_map_add_owned_resource(). The core then ioremaps the sub-blocks without requesting them, so vfio-pci-core owns the whole BAR and the requests do not collide. Assisted-by: LLM Signed-off-by: Manish Honap --- drivers/vfio/pci/cxl/vfio_cxl_core.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/vfio/pci/cxl/vfio_cxl_core.c b/drivers/vfio/pci/cxl/vfio_cxl_core.c index 0d92e6a409c1..5c8a63833a43 100644 --- a/drivers/vfio/pci/cxl/vfio_cxl_core.c +++ b/drivers/vfio/pci/cxl/vfio_cxl_core.c @@ -89,6 +89,15 @@ static int vfio_cxl_init_device(struct vfio_pci_core_device *vdev) goto err; } + /* + * vfio-pci-core requests the whole component-register BAR when the + * guest opens the device. Declare that BAR owned so the CXL core + * ioremaps the HDM and RAS sub-blocks without claiming them, and the + * full-BAR request does not collide. + */ + cxl_reg_map_add_owned_resource(&cxl->cxlds.reg_map, + pci_resource_n(pdev, pdev->hdm->hdm_bar)); + if (!cxl->cxlds.reg_map.component_map.hdm_decoder.valid) { pci_err(pdev, "vfio-cxl: HDM decoder registers not found\n"); ret = -ENODEV; -- 2.25.1