RE: [PATCH 1/6] iommu: Add new iommu op to create domains owned by userspace

[Tian, Kevin]

> From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
> Sent: Tuesday, September 19, 2023 5:25 PM
> 
> @@ -235,6 +235,13 @@ struct iommu_iotlb_gather {
>   *           use. The information type is one of enum iommu_hw_info_type
> defined
>   *           in include/uapi/linux/iommufd.h.
>   * @domain_alloc: allocate iommu domain

Given now we have two @alloc ops it'd be clearer to also update the
comment here so the explanation for @domain_alloc_user() is easier
to be understood, e.g.:

@domain_alloc: allocate and return an iommu domain if success. Otherwise
               NULL is returned. The domain is not fully initialized until
               the caller iommu_domain_alloc() returns.

> + * @domain_alloc_user: Allocate an iommu domain corresponding to the
> input
> + *                     parameters like flags defined as enum
> iommufd_ioas_map_flags
> + *                     in include/uapi/linux/iommufd.h. Different from the

"to the input parameters as defined in include/uapi/linux/iommufd.h".

> + *                     domain_alloc op, it requires iommu driver to fully
> + *                     initialize a new domain including the generic iommu_domain

"Unlike @domain_alloc, it is called only by iommufd and must fully initialize
the new domain before return".

*domain* here already refers to the generic iommu_domain struct.