linux-kernel - Re: [PATCH v2 03/11] iommufd/hw_pagetable: Use domain_alloc

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Date:   Fri, 19 May 2023 11:57:55 -0700
From:   Nicolin Chen <nicolinc@...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>,
        "jgg@...dia.com" <jgg@...dia.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>,
        "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>,
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        "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 v2 03/11] iommufd/hw_pagetable: Use domain_alloc_user op
 for domain allocation

On Fri, May 19, 2023 at 08:56:25AM +0000, Tian, Kevin wrote:
 
> > From: Yi Liu <yi.l.liu@...el.com>
> > Sent: Thursday, May 11, 2023 10:39 PM
> >
> >
> > @@ -88,7 +90,10 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx
> > *ictx, struct iommufd_ioas *ioas,
> >       refcount_inc(&ioas->obj.users);
> >       hwpt->ioas = ioas;
> >
> > -     hwpt->domain = iommu_domain_alloc(idev->dev->bus);
> > +     if (ops->domain_alloc_user)
> > +             hwpt->domain = ops->domain_alloc_user(idev->dev, NULL,
> > NULL);
> > +     else
> > +             hwpt->domain = iommu_domain_alloc(idev->dev->bus);
> 
> this reminds the comment for @domain_alloc_user() should clarify
> that UNMANGED domain type is assumed when no user data is
> provided, to be compatible with iommu_domain_alloc().

Yes. Perhaps:

 * @domain_alloc_user: allocate user iommu domain. A valid user_data pointer and
 *                     a parent pointer to a kernel-managed domain are required
 *                     to allocate an IOMMU_DOMAIN_NESTED domain. Otherwise, the
 *                     new domain will be set to an IOMMU_DOMAIN_UNMANAGED type.

Thanks
Nic