Alex Williamson
2022-Jul-06 17:42 UTC
[PATCH v5 0/5] cover-letter: Simplify vfio_iommu_type1 attach/detach routine
On Fri, 1 Jul 2022 14:44:50 -0700 Nicolin Chen <nicolinc at nvidia.com> wrote:> 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_attachHow do you foresee this going in, I'm imagining Joerg would merge the first patch via the IOMMU tree and provide a topic branch that I'd merge into the vfio tree along with the remaining patches. Sound right? Thanks, Alex> Changelog > v5: > * Rebased on top of Robin's "Simplify bus_type determination". > * Fixed a wrong change returning -EMEDIUMTYPE in arm-smmu driver. > * Added Baolu's "Reviewed-by". > 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 at 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 at 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 at 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 | 5 +- > 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 | 352 ++++++++++---------- > 14 files changed, 229 insertions(+), 216 deletions(-) >