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

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Message-ID: <ZMPzJd6iIFk/51Om@nvidia.com>
Date:   Fri, 28 Jul 2023 13:56:05 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     "Liu, Yi L" <yi.l.liu@...el.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "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>
Subject: Re: [PATCH v3 01/17] iommu: Add new iommu op to create domains owned
 by userspace

On Fri, Jul 28, 2023 at 09:37:21AM +0000, Tian, Kevin wrote:
> > 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."

 "If @user_data is valid and @parent points to a kernel-managed domain,
 then the returned domain must be the IOMMU_DOMAIN_NESTED type. Otherwise
 the returned domain is IOMMU_DOMAIN_UNMANAGED."

Notice the detail that this API expects the driver to set the type and
fully initialize the domain, including the generic iommu_domain
struct, which is different than alloc_domain.

When we implement this in drivers we should tidy this so all the alloc
flows fully initialize the domain internally.

Jason