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# 57f09887 29-Nov-2022 Jason Gunthorpe <jgg@nvidia.com>

iommufd: Add a selftest

Cover the essential functionality of the iommufd with a directed test from
userspace. This aims to achieve reasonable functional coverage using the
in-kernel self test framew

iommufd: Add a selftest

Cover the essential functionality of the iommufd with a directed test from
userspace. This aims to achieve reasonable functional coverage using the
in-kernel self test framework.

A second test does a failure injection sweep of the success paths to study
error unwind behaviors.

This allows achieving high coverage of the corner cases in pages.c.

The selftest requires CONFIG_IOMMUFD_TEST to be enabled, and several huge
pages which may require:

echo 4 > /proc/sys/vm/nr_hugepages

Link: https://lore.kernel.org/r/19-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com> # s390
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Eric Auger <eric.auger@redhat.com> # aarch64
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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