RE: [PATCH 05/10] vfio: Use IOMMU_CAP_ENFORCE_CACHE_COHERENCY for vfio_file_enforced_coherent()

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To: Jason Gunthorpe <jgg@xxxxxxxxxx>
Subject: RE: [PATCH 05/10] vfio: Use IOMMU_CAP_ENFORCE_CACHE_COHERENCY for vfio_file_enforced_coherent()
From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
Date: Thu, 3 Nov 2022 04:38:16 +0000
Accept-language: en-US
Cc: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>, David Airlie <airlied@xxxxxxxxx>, Tony Krowiak <akrowiak@xxxxxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, Daniel Vetter <daniel@xxxxxxxx>, Diana Craciun <diana.craciun@xxxxxxxxxxx>, "dri-devel@xxxxxxxxxxxxxxxxxxxxx" <dri-devel@xxxxxxxxxxxxxxxxxxxxx>, "Eric Auger" <eric.auger@xxxxxxxxxx>, Eric Farman <farman@xxxxxxxxxxxxx>, "Harald Freudenberger" <freude@xxxxxxxxxxxxx>, Vasily Gorbik <gor@xxxxxxxxxxxxx>, Heiko Carstens <hca@xxxxxxxxxxxxx>, "intel-gfx@xxxxxxxxxxxxxxxxxxxxx" <intel-gfx@xxxxxxxxxxxxxxxxxxxxx>, "intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx" <intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx>, "iommu@xxxxxxxxxxxxxxx" <iommu@xxxxxxxxxxxxxxx>, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>, "Jason Herne" <jjherne@xxxxxxxxxxxxx>, Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>, Joerg Roedel <joro@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "linux-s390@xxxxxxxxxxxxxxx" <linux-s390@xxxxxxxxxxxxxxx>, Longfang Liu <liulongfang@xxxxxxxxxx>, "Matthew Rosato" <mjrosato@xxxxxxxxxxxxx>, Peter Oberparleiter <oberpar@xxxxxxxxxxxxx>, Halil Pasic <pasic@xxxxxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, "Vivi, Rodrigo" <rodrigo.vivi@xxxxxxxxx>, "Shameer Kolothum" <shameerali.kolothum.thodi@xxxxxxxxxx>, Sven Schnelle <svens@xxxxxxxxxxxxx>, Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>, Vineeth Vijayan <vneethv@xxxxxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Yishai Hadas <yishaih@xxxxxxxxxx>, Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx>, "Wang, Zhi A" <zhi.a.wang@xxxxxxxxx>, Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>, Nicolin Chen <nicolinc@xxxxxxxxxx>, "Liu, Yi L" <yi.l.liu@xxxxxxxxx>
In-reply-to: <Y2EQb6mSTKOvASlp@nvidia.com>
References: <0-v1-4991695894d8+211-vfio_iommufd_jgg@nvidia.com> <5-v1-4991695894d8+211-vfio_iommufd_jgg@nvidia.com> <BN9PR11MB52766FB4EFCFB2197ACDC1F98C369@BN9PR11MB5276.namprd11.prod.outlook.com> <Y2EQb6mSTKOvASlp@nvidia.com>
Thread-index: AQHY6J4OIe2WwX1TpkuArkGmC4dhx64pufEQgABPIYCAAqG6kA==
Thread-topic: [PATCH 05/10] vfio: Use IOMMU_CAP_ENFORCE_CACHE_COHERENCY for vfio_file_enforced_coherent()

> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Tuesday, November 1, 2022 8:26 PM
> And this:
> 
> 	/*
> 	 * If the device does not have
> IOMMU_CAP_ENFORCE_CACHE_COHERENCY then
> 	 * any domain later attached to it will also not support it. If the cap
> 	 * is set then the iommu_domain eventually attached to the
> device/group
> 	 * must must use a domain with enforce_cache_coherency().
> 	 */

duplicated 'must'

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References:
- [PATCH 00/10] Connect VFIO to IOMMUFD
  - From: Jason Gunthorpe
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