RE: [PATCH v3 01/17] iommu: Add new iommu op to create domains owned by userspace

[Tian, Kevin]

> From: Yi Liu <yi.l.liu@xxxxxxxxx>
> Sent: Monday, July 24, 2023 7:04 PM
>
> + * @domain_alloc_user: allocate a user iommu domain corresponding to
> the input
> + *                     @hwpt_type that is defined as enum iommu_hwpt_type in the
> + *                     include/uapi/linux/iommufd.h. A returning domain will be
> + *                     set to an IOMMU_DOMAIN_NESTED type, upon valid
> @user_data
> + *                     and @parent that is a kernel-managed domain. Otherwise,
> + *                     it will be set to an IOMMU_DOMAIN_UNMANAGED type.
> Return
> + *                     ERR_PTR on allocation failure.

"If @user_data is valid and @parent points to a kernel-managed domain,
the returning domain is set to IOMMU_DOMAIN_NESTED type. Otherwise
it is set to IOMMU_DOMAIN_UNMANAGED type."

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>