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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <DS0PR11MB752907DDEBA69BFD823F09EBC305A@DS0PR11MB7529.namprd11.prod.outlook.com>
Date:   Mon, 31 Jul 2023 12:44:25 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>,
        "Tian, Kevin" <kevin.tian@...el.com>
CC:     "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

> From: Jason Gunthorpe <jgg@...dia.com>
> Sent: Saturday, July 29, 2023 12:56 AM
> 
> 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.

Yes. this should be documented in the kdoc. Is it?

Regards,
Yi Liu