Re: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains

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To: "Tian, Kevin" <kevin.tian@xxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxxxx>
Subject: Re: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
From: Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Wed, 18 Oct 2023 10:32:25 +0800
Cc: baolu.lu@xxxxxxxxxxxxxxx, Nicolin Chen <nicolinc@xxxxxxxxxx>, "Liu, Yi L" <yi.l.liu@xxxxxxxxx>, "joro@xxxxxxxxxx" <joro@xxxxxxxxxx>, "alex.williamson@xxxxxxxxxx" <alex.williamson@xxxxxxxxxx>, "robin.murphy@xxxxxxx" <robin.murphy@xxxxxxx>, "cohuck@xxxxxxxxxx" <cohuck@xxxxxxxxxx>, "eric.auger@xxxxxxxxxx" <eric.auger@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>, "Martins, Joao" <joao.m.martins@xxxxxxxxxx>
In-reply-to: <BN9PR11MB5276FDC375685CE04A7AD93B8CD6A@BN9PR11MB5276.namprd11.prod.outlook.com>
User-agent: Mozilla Thunderbird

On 10/17/23 4:52 PM, Tian, Kevin wrote:

another problem is that intel_iommu_enforce_cache_coherency()
doesn't update existing entries. It only sets a domain flag to affect
future mappings. so it means the 2nd idev is also broken.

This is such a gap, intel driver should not permit that.

yes. @Baolu, can you add a fix?


Sure thing!

Best regards,
baolu

References:
- [PATCH v4 00/17] iommufd: Add nesting infrastructure
  - From: Yi Liu
- [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
  - From: Yi Liu
- RE: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
  - From: Tian, Kevin
- Re: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
  - From: Nicolin Chen
- RE: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
  - From: Tian, Kevin
- Re: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
  - From: Jason Gunthorpe
- RE: [PATCH v4 08/17] iommufd: Always setup MSI and anforce cc on kernel-managed domains
  - From: Tian, Kevin

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