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    Subject[PATCH v4 0/5] Simplify vfio_iommu_type1 attach/detach routine
    Date
    This is a preparatory series for IOMMUFD v2 patches. It enforces error
    code -EMEDIUMTYPE in iommu_attach_device() and iommu_attach_group() when
    an IOMMU domain and a device/group are incompatible. It also drops the
    useless domain->ops check since it won't fail in current environment.

    These allow VFIO iommu code to simplify its group attachment routine, by
    avoiding the extra IOMMU domain allocations and attach/detach sequences
    of the old code.

    Worths mentioning the exact match for enforce_cache_coherency is removed
    with this series, since there's very less value in doing that as KVM will
    not be able to take advantage of it -- this just wastes domain memory.
    Instead, we rely on Intel IOMMU driver taking care of that internally.

    This is on github:
    https://github.com/nicolinc/iommufd/commits/vfio_iommu_attach

    Changelog
    v4:
    * Dropped EMEDIUMTYPE change in mtk_v1 driver per Robin's input
    * Added Baolu's and Kevin's Reviewed-by lines
    v3: https://lore.kernel.org/kvm/20220623200029.26007-1-nicolinc@nvidia.com/
    * Dropped all dev_err since -EMEDIUMTYPE clearly indicates what error.
    * Updated commit message of enforce_cache_coherency removing patch.
    * Updated commit message of domain->ops removing patch.
    * Replaced "goto out_unlock" with simply mutex_unlock() and return.
    * Added a line of comments for -EMEDIUMTYPE return check.
    * Moved iommu_get_msi_cookie() into alloc_attach_domain() as a cookie
    should be logically tied to the lifetime of a domain itself.
    * Added Kevin's "Reviewed-by".
    v2: https://lore.kernel.org/kvm/20220616000304.23890-1-nicolinc@nvidia.com/
    * Added -EMEDIUMTYPE to more IOMMU drivers that fit the category.
    * Changed dev_err to dev_dbg for -EMEDIUMTYPE to avoid kernel log spam.
    * Dropped iommu_ops patch, and removed domain->ops in VFIO directly,
    since there's no mixed-driver use case that would fail the sanity.
    * Updated commit log of the patch removing enforce_cache_coherency.
    * Fixed a misplace of "num_non_pinned_groups--" in detach_group patch.
    * Moved "num_non_pinned_groups++" in PATCH-5 to the common path between
    domain-reusing and new-domain pathways, like the code previously did.
    * Fixed a typo in EMEDIUMTYPE patch.
    v1: https://lore.kernel.org/kvm/20220606061927.26049-1-nicolinc@nvidia.com/

    Jason Gunthorpe (1):
    vfio/iommu_type1: Prefer to reuse domains vs match enforced cache
    coherency

    Nicolin Chen (4):
    iommu: Return -EMEDIUMTYPE for incompatible domain and device/group
    vfio/iommu_type1: Remove the domain->ops comparison
    vfio/iommu_type1: Clean up update_dirty_scope in detach_group()
    vfio/iommu_type1: Simplify group attachment

    drivers/iommu/amd/iommu.c | 2 +-
    drivers/iommu/apple-dart.c | 4 +-
    drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 15 +-
    drivers/iommu/arm/arm-smmu/arm-smmu.c | 6 +-
    drivers/iommu/arm/arm-smmu/qcom_iommu.c | 9 +-
    drivers/iommu/intel/iommu.c | 10 +-
    drivers/iommu/iommu.c | 28 ++
    drivers/iommu/ipmmu-vmsa.c | 4 +-
    drivers/iommu/omap-iommu.c | 3 +-
    drivers/iommu/s390-iommu.c | 2 +-
    drivers/iommu/sprd-iommu.c | 6 +-
    drivers/iommu/tegra-gart.c | 2 +-
    drivers/iommu/virtio-iommu.c | 3 +-
    drivers/vfio/vfio_iommu_type1.c | 340 ++++++++++----------
    14 files changed, 224 insertions(+), 210 deletions(-)

    --
    2.17.1

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