[PATCH v5 10/13] iommufd/selftest: Add IOMMU_VIOMMU_TYPE_SELFTEST

[Tian, Kevin]

> From: Nicolin Chen <nicolinc at nvidia.com>
> Sent: Saturday, October 26, 2024 7:50 AM
> 
> Implement the viommu alloc/free functions to increase/reduce refcount of
> its dependent mock iommu device. User space can verify this loop via the
> IOMMU_VIOMMU_TYPE_SELFTEST.
> 
> Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>

Reviewed-by: Kevin Tian <kevin.tian at intel.com>