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Subject: RE: [PATCH v2 01/11] iommu: Add new iommu op to create domains owned
 by userspace
Thread-Topic: [PATCH v2 01/11] iommu: Add new iommu op to create domains owned
 by userspace
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Date:   Fri, 19 May 2023 08:47:45 +0000
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> From: Liu, Yi L <yi.l.liu@intel.com>
> Sent: Thursday, May 11, 2023 10:39 PM
> @@ -229,6 +238,15 @@ struct iommu_iotlb_gather {
>   *           after use. Return the data buffer if success, or ERR_PTR on
>   *           failure.
>   * @domain_alloc: allocate iommu domain
> + * @domain_alloc_user: allocate user iommu domain
> + * @domain_alloc_user_data_len: return the required length of the user
> data
> + *                              to allocate a specific type user iommu d=
omain.
> + *                              @hwpt_type is defined as enum iommu_hwpt=
_type
> + *                              in include/uapi/linux/iommufd.h. The ret=
urned
> + *                              length is the corresponding sizeof drive=
r data
> + *                              structures in include/uapi/linux/iommufd=
.h.
> + *                              -EOPNOTSUPP would be returned if the inp=
ut
> + *                              @hwpt_type is not supported by the drive=
r.

Can this be merged with earlier @hw_info callback? That will already
report a list of supported hwpt types. is there a problem to further
describe the data length for each type in that interface?