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

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Message-ID: <BN9PR11MB52765C4F05F7632829B53BAC8C06A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Fri, 28 Jul 2023 09:37:21 +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>,
        "Liu, Yi L" <yi.l.liu@...el.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>
Subject: RE: [PATCH v3 01/17] iommu: Add new iommu op to create domains owned
 by userspace

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