linux-kernel - RE: [PATCH v6 8/8] iommu/vt-d: Disallow read-only mappings to nest parent domain

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Date:   Tue, 24 Oct 2023 02:06:46 +0000
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        "joro@...tes.org" <joro@...tes.org>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "jgg@...dia.com" <jgg@...dia.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        "robin.murphy@....com" <robin.murphy@....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>,
        "Zeng, Xin" <xin.zeng@...el.com>
Subject: RE: [PATCH v6 8/8] iommu/vt-d: Disallow read-only mappings to nest
 parent domain

> From: Baolu Lu <baolu.lu@...ux.intel.com>
> Sent: Monday, October 23, 2023 8:18 PM
> 
> On 2023/10/23 19:15, Liu, Yi L wrote:
> >> I would also prefer to introduce is_nested_parent_domain to the user
> >> domain allocation patch (patch 7/8). This field should be checked when
> >> allocating a nested user domain.
> > A ctually, no need. This should be a common check, so iommufd core already
> > has the check. So the parent should be a nest parent domain, otherwise already
> > returned in iommufd.
> >
> > +	if (!parent->nest_parent)
> > +		return ERR_PTR(-EINVAL);
> 
> I know this will not cause errors in the code. But since you are
> introducing is_parent property in the vt-d driver. The integrity of the
> property should be ensured. In this way, it will make the code more
> readable and maintainable.

Ok, if consider it as a property, then it's fine. At first, I just want to
make it as a special flag for this errata. But we cannot predict if there
will be more nested parent special stuffs, then this flag is also needed.

Regards,
Yi Liu