Re: [PATCH v3 00/10] Add Intel VT-d nested translation

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Subject: Re: [PATCH v3 00/10] Add Intel VT-d nested translation
From: Jason Gunthorpe <jgg@xxxxxxxxxx>
Date: Mon, 29 May 2023 15:43:02 -0300
Cc: "Liu, Yi L" <yi.l.liu@xxxxxxxxx>, "joro@xxxxxxxxxx" <joro@xxxxxxxxxx>, "alex.williamson@xxxxxxxxxx" <alex.williamson@xxxxxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "baolu.lu@xxxxxxxxxxxxxxx" <baolu.lu@xxxxxxxxxxxxxxx>, "cohuck@xxxxxxxxxx" <cohuck@xxxxxxxxxx>, "eric.auger@xxxxxxxxxx" <eric.auger@xxxxxxxxxx>, "nicolinc@xxxxxxxxxx" <nicolinc@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "mjrosato@xxxxxxxxxxxxx" <mjrosato@xxxxxxxxxxxxx>, "chao.p.peng@xxxxxxxxxxxxxxx" <chao.p.peng@xxxxxxxxxxxxxxx>, "yi.y.sun@xxxxxxxxxxxxxxx" <yi.y.sun@xxxxxxxxxxxxxxx>, "peterx@xxxxxxxxxx" <peterx@xxxxxxxxxx>, "jasowang@xxxxxxxxxx" <jasowang@xxxxxxxxxx>, "shameerali.kolothum.thodi@xxxxxxxxxx" <shameerali.kolothum.thodi@xxxxxxxxxx>, "lulu@xxxxxxxxxx" <lulu@xxxxxxxxxx>, "suravee.suthikulpanit@xxxxxxx" <suravee.suthikulpanit@xxxxxxx>, "iommu@xxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-kselftest@xxxxxxxxxxxxxxx" <linux-kselftest@xxxxxxxxxxxxxxx>, "Duan, Zhenzhong" <zhenzhong.duan@xxxxxxxxx>
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References: <20230511145110.27707-1-yi.l.liu@intel.com> <BN9PR11MB52765FA8255FB8F8A1A6F11B8C419@BN9PR11MB5276.namprd11.prod.outlook.com>

On Wed, May 24, 2023 at 08:59:43AM +0000, Tian, Kevin wrote:

> At least this looks a reasonable tradeoff to some proprietary VMMs
> which never adds RO mappings in stage-2 today.

What is the reason for the RO anyhow?

Would it be so bad if it was DMA mapped as RW due to the errata?

Jason

Follow-Ups:
- RE: [PATCH v3 00/10] Add Intel VT-d nested translation
  - From: Tian, Kevin
- Re: [PATCH v3 00/10] Add Intel VT-d nested translation
  - From: Alex Williamson

References:
- [PATCH v3 00/10] Add Intel VT-d nested translation
  - From: Yi Liu
- RE: [PATCH v3 00/10] Add Intel VT-d nested translation
  - From: Tian, Kevin

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