diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2022-11-29 16:29:39 -0400 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@nvidia.com> | 2022-11-30 20:16:49 -0400 |
| commit | f4b20bb34c83dceade5470288f48f94ce3598ada (patch) | |
| tree | 914330be8795c745de283d8bd8b1314b36d2d5da /include/linux/iommufd.h | |
| parent | d624d6652a65ad4f47a58b8651a1ec1163bb81d3 (diff) | |
iommufd: Add kernel support for testing iommufd
Provide a mock kernel module for the iommu_domain that allows it to run
without any HW and the mocking provides a way to directly validate that
the PFNs loaded into the iommu_domain are correct. This exposes the access
kAPI toward userspace to allow userspace to explore the functionality of
pages.c and io_pagetable.c
The mock also simulates the rare case of PAGE_SIZE > iommu page size as
the mock will operate at a 2K iommu page size. This allows exercising all
of the calculations to support this mismatch.
This is also intended to support syzkaller exploring the same space.
However, it is an unusually invasive config option to enable all of
this. The config option should not be enabled in a production kernel.
Link: https://lore.kernel.org/r/16-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com> # s390
Tested-by: Eric Auger <eric.auger@redhat.com> # aarch64
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'include/linux/iommufd.h')
| -rw-r--r-- | include/linux/iommufd.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 84af9a239769..650d45629647 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -34,6 +34,9 @@ enum { IOMMUFD_ACCESS_RW_WRITE = 1 << 0, /* Set if the caller is in a kthread then rw will use kthread_use_mm() */ IOMMUFD_ACCESS_RW_KTHREAD = 1 << 1, + + /* Only for use by selftest */ + __IOMMUFD_ACCESS_RW_SLOW_PATH = 1 << 2, }; struct iommufd_access * |