[PATCH v3 3/3] Turn off test_uffdio_wp if CONFIG_PTE_MARKER_UFFD_WP is not configured.

From: Audra Mitchell
Date: Wed Jun 26 2024 - 09:06:33 EST


If CONFIG_PTE_MARKER_UFFD_WP is disabled, then we turn off three features
in userfaultfd_api (UFFD_FEATURE_WP_HUGETLBFS_SHMEM,
UFFD_FEATURE_WP_UNPOPULATED, and UFFD_FEATURE_WP_ASYNC). Currently this
test always will call uffdio_regsiter with the flag
UFFDIO_REGISTER_MODE_WP. However, the kernel ensures in vma_can_userfault
that if the feature UFFD_FEATURE_WP_HUGETLBFS_SHMEM is disabled, only
allow the VM_UFFD_WP on anonymous vmas, meaning our call to
uffdio_regsiter will fail. We still want to be able to run the test even
if we have CONFIG_PTE_MARKER_UFFD_WP disabled, so check to see if the
feature UFFD_FEATURE_WP_HUGETLBFS_SHMEM has been turned off in the test
and if so, disable us from calling uffdio_regsiter with the flag
UFFDIO_REGISTER_MODE_WP.

Signed-off-by: Audra Mitchell <audra@xxxxxxxxxx>
---
tools/testing/selftests/mm/uffd-stress.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/mm/uffd-stress.c b/tools/testing/selftests/mm/uffd-stress.c
index b9b6d858eab8..3266ae885f75 100644
--- a/tools/testing/selftests/mm/uffd-stress.c
+++ b/tools/testing/selftests/mm/uffd-stress.c
@@ -419,6 +419,9 @@ static void parse_test_type_arg(const char *raw_type)
test_uffdio_wp = test_uffdio_wp &&
(features & UFFD_FEATURE_PAGEFAULT_FLAG_WP);

+ if (test_type != TEST_ANON && !(features & UFFD_FEATURE_WP_HUGETLBFS_SHMEM))
+ test_uffdio_wp = false;
+
close(uffd);
uffd = -1;
}
--
2.44.0