> From: Jason Gunthorpe <[email protected]> > Sent: Wednesday, October 8, 2025 12:12 AM > > This intends to have high coverage of the page table format functions and > the IOMMU implementation itself, exercising the various corner cases. > > The kunit tests can be run in the kunit framework, using commands like: > > tools/testing/kunit/kunit.py run --build_dir build_kunit_arm64 --arch arm64 - > -make_options LLVM=-19 -- > kunitconfig ./drivers/iommu/generic_pt/.kunitconfig > tools/testing/kunit/kunit.py run --build_dir build_kunit_uml -- > kunitconfig ./drivers/iommu/generic_pt/.kunitconfig --kconfig_add > CONFIG_WERROR=n --kconfig_add > CONFIG_UML_PCI_OVER_VIRTIO_DEVICE_ID=100 > tools/testing/kunit/kunit.py run --build_dir build_kunit_x86_64 --arch x86_64 > --kunitconfig ./drivers/iommu/generic_pt/.kunitconfig > tools/testing/kunit/kunit.py run --build_dir build_kunit_i386 --arch i386 -- > kunitconfig ./drivers/iommu/generic_pt/.kunitconfig > tools/testing/kunit/kunit.py run --build_dir build_kunit_i386pae --arch i386 > -- > kunitconfig ./drivers/iommu/generic_pt/.kunitconfig --kconfig_add > CONFIG_X86_PAE=y > > There are several interesting corner cases on the 32 bit platforms that > need checking. > > Like the generic tests, these are run on the format's configuration list > using kunit "params". This also checks the core iommu parts of the page > table code as it enters the logic through a mock iommu_domain. > > The following are checked: > - PT_FEAT_DYNAMIC_TOP properly adds levels one by one > - Every page size can be iommu_map()'d, and mapping creates that size > - iommu_iova_to_phys() works with every page size > - Test converting OA -> non present -> OA when the two OAs overlap and > free table levels > - Test that unmap stops at holes, unmap doesn't split, and unmap returns > the right values for partial unmap requests > - Randomly map/unmap. Checks map with random sizes, that map fails > when > hitting collisions doing nothing, unmap/map with random intersections and > full unmap of random sizes. Also checks iommu_iova_to_phys() with > random > sizes > - Check for memory leaks by monitoring NR_SECONDARY_PAGETABLE > > Tested-by: Alejandro Jimenez <[email protected]> > Signed-off-by: Jason Gunthorpe <[email protected]>
Reviewed-by: Kevin Tian <[email protected]>
