linux-kernel - RE: [PATCH v4 12/12] iommu/vt-d: Disallow nesting on domains with read-only mappings

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Message-ID: <BN9PR11MB5276E14F132C58BD6C50C9218C08A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 3 Aug 2023 04:00:35 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Baolu Lu <baolu.lu@...ux.intel.com>,
        "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>
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>
Subject: RE: [PATCH v4 12/12] iommu/vt-d: Disallow nesting on domains with
 read-only mappings

> From: Baolu Lu <baolu.lu@...ux.intel.com>
> Sent: Thursday, August 3, 2023 11:27 AM
> 
> On 2023/8/2 15:59, Tian, Kevin wrote:
> >> From: Liu, Yi L <yi.l.liu@...el.com>
> >> Sent: Monday, July 24, 2023 7:14 PM
> >>
> >> +	u8 read_only_mapped:1;		/* domain has mappings with
> >> read-only
> >> +					 * permission.
> >> +					 */
> >> +	u8 set_nested:1;		/* has other domains nested on it */
> >
> > what about "is_parent"?
> 
> "is_parent" is still a bit generic. How about "is_nested_parent"?
> 

looks good.