Re: [PATCH v3 01/15] iommu: Add IOMMU_CAP_ENFORCE_CACHE_COHERENCY

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To: Jason Gunthorpe <jgg@xxxxxxxxxx>, bpf@xxxxxxxxxxxxxxx, Jonathan Corbet <corbet@xxxxxxx>, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, iommu@xxxxxxxxxxxxxxx, Joerg Roedel <joro@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, llvm@xxxxxxxxxxxxxxx, Nathan Chancellor <nathan@xxxxxxxxxx>, Nick Desaulniers <ndesaulniers@xxxxxxxxxx>, Miguel Ojeda <ojeda@xxxxxxxxxx>, Robin Murphy <robin.murphy@xxxxxxx>, Shuah Khan <shuah@xxxxxxxxxx>, Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>, Tom Rix <trix@xxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>
Subject: Re: [PATCH v3 01/15] iommu: Add IOMMU_CAP_ENFORCE_CACHE_COHERENCY
From: Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Wed, 26 Oct 2022 20:45:15 +0800
Cc: baolu.lu@xxxxxxxxxxxxxxx, Alex Williamson <alex.williamson@xxxxxxxxxx>, Chaitanya Kulkarni <chaitanyak@xxxxxxxxxx>, Cornelia Huck <cohuck@xxxxxxxxxx>, Daniel Jordan <daniel.m.jordan@xxxxxxxxxx>, David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>, Eric Auger <eric.auger@xxxxxxxxxx>, Eric Farman <farman@xxxxxxxxxxxxx>, Jason Wang <jasowang@xxxxxxxxxx>, Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>, Joao Martins <joao.m.martins@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Matthew Rosato <mjrosato@xxxxxxxxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Nicolin Chen <nicolinc@xxxxxxxxxx>, Niklas Schnelle <schnelle@xxxxxxxxxxxxx>, Shameerali Kolothum Thodi <shameerali.kolothum.thodi@xxxxxxxxxx>, Yi Liu <yi.l.liu@xxxxxxxxx>, Keqian Zhu <zhukeqian1@xxxxxxxxxx>
In-reply-to: <1-v3-402a7d6459de+24b-iommufd_jgg@nvidia.com>
User-agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.4.0

On 2022/10/26 2:12, Jason Gunthorpe wrote:

This queries if a domain linked to a device should expect to support
enforce_cache_coherency() so iommufd can negotiate the rules for when a
domain should be shared or not.

For iommufd a device that declares IOMMU_CAP_ENFORCE_CACHE_COHERENCY will
not be attached to a domain that does not support it.

Signed-off-by: Jason Gunthorpe<jgg@xxxxxxxxxx>


Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Best regards,
baolu

References:
- [PATCH v3 01/15] iommu: Add IOMMU_CAP_ENFORCE_CACHE_COHERENCY
  - From: Jason Gunthorpe

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