[PATCH 0/6] Make set_dev_pasid op supportting domain replacement

Yi Liu
2024-06-28T08:55:40Z

This splits the preparation works of the iommu and the Intel iommu driver
out from the iommufd pasid attach/replace series. [1]

To support domain replacement, the definition of the set_dev_pasid op
needs to be enhanced. Meanwhile, the existing set_dev_pasid callbacks
should be extended as well to suit the new definition.

pasid attach/replace is mandatory on Intel VT-d given the PASID table
locates in the physical address space hence must be managed by the kernel,
both for supporting vSVA and coming SIOV. But it's optional on ARM/AMD
which allow configuring the PASID/CD table either in host physical address
space or nested on top of an GPA address space. This series only extends
the Intel iommu driver as the minimal requirement.

This series first prepares the Intel iommu set_dev_pasid op for the new
definition, adds the missing set_dev_pasid support for nested domain, and
in the end enhances the definition of set_dev_pasid op. The ARM and AMD
set_dev_pasid callbacks is extended to fail if the caller tries to do domain
replacement to meet the new definition of set_dev_pasid op.

This series is on top of Baolu's paging domain alloc refactor, where his
code can be found at [2].

[1] https://lore.kernel.org/linux-iommu/20240412081516.31168-1-yi.l.liu@intel.com/
[2] https://github.com/LuBaolu/intel-iommu/commits/vtd-paging-domain-refactor-v1

Regards,
Yi Liu

Lu Baolu (1):
iommu/vt-d: Add set_dev_pasid callback for nested domain

Yi Liu (5):
iommu: Pass old domain to set_dev_pasid op
iommu/vt-d: Move intel_drain_pasid_prq() into
intel_pasid_tear_down_entry()
iommu/vt-d: Make helpers support modifying present pasid entry
iommu/vt-d: Make intel_iommu_set_dev_pasid() to handle domain
replacement
iommu: Make set_dev_pasid op support domain replacement

drivers/iommu/amd/amd_iommu.h | 3 +-
drivers/iommu/amd/pasid.c | 6 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 6 +-
drivers/iommu/intel/debugfs.c | 2 +
drivers/iommu/intel/iommu.c | 117 ++++++++++++------
drivers/iommu/intel/iommu.h | 3 +
drivers/iommu/intel/nested.c | 1 +
drivers/iommu/intel/pasid.c | 46 +++----
drivers/iommu/intel/pasid.h | 5 +-
drivers/iommu/intel/svm.c | 9 +-
drivers/iommu/iommu.c | 3 +-
include/linux/iommu.h | 5 +-
12 files changed, 132 insertions(+), 74 deletions(-)

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2.34.1