[PATCH v1 05/12] iommu: Introduce get_viommu_size and viommu_init ops

[Tian, Kevin]

> From: Nicolin Chen <nicolinc at nvidia.com>
> Sent: Tuesday, June 10, 2025 1:13 AM
> + * @get_viommu_size: Get the size of a driver-level vIOMMU structure for a
> given
> + *                   @dev corresponding to @viommu_type. Driver should return
> an
> + *                   errno if vIOMMU isn't supported accordingly. It is required
> + *                   for driver to use the VIOMMU_STRUCT_SIZE macro to sanitize
> + *                   a driver-level vIOMMU structure related to the core one

What about returning size with '0' indicating NOSUPPORT?