iommufd: Add IOMMU_HWPT_INVALIDATE

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In nested translation, the stage-1 page table is user-managed but cached
by the IOMMU hardware, so an update on present page table entries in the
stage-1 page table should be followed with a cache invalidation.

Add an IOMMU_HWPT_INVALIDATE ioctl to support such a cache invalidation.
It takes hwpt_id to specify the iommu_domain, and a multi-entry array to
support multiple invalidation data in one ioctl.

enum iommu_hwpt_invalidate_data_type is defined to tag the data type of
the entries in the multi-entry array.

Link: https://lore.kernel.org/r/20240111041015.47920-3-yi.l.liu@intel.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Co-developed-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

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This commit is contained in:

Yi Liu 2024-01-10 20:10:09 -08:00 • committed by Jason Gunthorpe

parent f35b88b66f

commit 8c6eabae38

4 changed files with 97 additions and 0 deletions

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41

drivers/iommu/iommufd/hw_pagetable.c

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10

drivers/iommu/iommufd/iommufd_private.h

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3

drivers/iommu/iommufd/main.c

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43

include/uapi/linux/iommufd.h

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