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

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Date:   Tue, 26 Sep 2023 05:28:13 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
CC:     "cohuck@...hat.com" <cohuck@...hat.com>,
        "eric.auger@...hat.com" <eric.auger@...hat.com>,
        "nicolinc@...dia.com" <nicolinc@...dia.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "chao.p.peng@...ux.intel.com" <chao.p.peng@...ux.intel.com>,
        "yi.y.sun@...ux.intel.com" <yi.y.sun@...ux.intel.com>,
        "peterx@...hat.com" <peterx@...hat.com>,
        "jasowang@...hat.com" <jasowang@...hat.com>,
        "shameerali.kolothum.thodi@...wei.com" 
        <shameerali.kolothum.thodi@...wei.com>,
        "lulu@...hat.com" <lulu@...hat.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "Duan, Zhenzhong" <zhenzhong.duan@...el.com>,
        "Martins, Joao" <joao.m.martins@...cle.com>
Subject: RE: [PATCH 1/6] iommu: Add new iommu op to create domains owned by
 userspace

> From: Liu, Yi L <yi.l.liu@...el.com>
> 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.