On Sat, Nov 04, 2023 at 01:16:41AM +0800, Cindy Lu wrote:

Expose the function iommu_device_use_default_domain() and
iommu_device_unuse_default_domain()，
While vdpa bind the iommufd device and detach the iommu device,
vdpa need to call the function
iommu_device_unuse_default_domain() to release the owner

Definately not. You need to set the driver_managed_dma flag.

Jason