[Linaro-mm-sig] Re: [PATCH v8 09/11] vfio/pci: Enable peer-to-peer DMA transactions by default

From: Leon Romanovsky leon@kernel.org Sent: Tuesday, November 11, 2025 5:58 PM

From: Leon Romanovsky leonro@nvidia.com

not required with only your own s-o-b

@@ -2090,6 +2092,9 @@ int vfio_pci_core_init_dev(struct vfio_device *core_vdev) INIT_LIST_HEAD(&vdev->dummy_resources_list); INIT_LIST_HEAD(&vdev->ioeventfds_list); INIT_LIST_HEAD(&vdev->sriov_pfs_item);

• ret = pcim_p2pdma_init(vdev->pdev);
• if (ret && ret != -EOPNOTSUPP)

• return ret;
  

Reading the commit msg seems -EOPNOTSUPP is only returned for fake PCI devices, otherwise it implies regression. better add a comment for it?

otherwise,

Reviewed-by: Kevin Tian kevin.tian@intel.com