linux-kernel - [RFC PATCH 2/2] selftests: restrictedmem: Add selftest for RMFD

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Date:   Sat, 18 Feb 2023 00:43:02 +0000
From:   Ackerley Tng <ackerleytng@...gle.com>
To:     kvm@...r.kernel.org, linux-api@...r.kernel.org,
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        Ackerley Tng <ackerleytng@...gle.com>
Subject: [RFC PATCH 2/2] selftests: restrictedmem: Add selftest for RMFD_HUGEPAGE

Tests that when RMFD_HUGEPAGE is specified, restrictedmem will be
backed by Transparent HugePages.

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 .../restrictedmem_hugepage_test.c             | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c b/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c
index 0d9cf2ced754..75283d68696f 100644
--- a/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c
+++ b/tools/testing/selftests/restrictedmem/restrictedmem_hugepage_test.c
@@ -180,6 +180,31 @@ TEST_F(reset_shmem_enabled, restrictedmem_fstat_shmem_enabled_always)
 	close(mfd);
 }
 
+TEST(restrictedmem_invalid_flags)
+{
+	int mfd = memfd_restricted(99, NULL);
+
+	ASSERT_EQ(-1, mfd);
+	ASSERT_EQ(EINVAL, errno);
+}
+
+TEST_F(reset_shmem_enabled, restrictedmem_rmfd_hugepage)
+{
+	int mfd = -1;
+	struct stat stat;
+
+	ASSERT_EQ(0, set_shmem_thp_policy("never"));
+
+	mfd = memfd_restricted(RMFD_HUGEPAGE, NULL);
+	ASSERT_NE(-1, mfd);
+
+	ASSERT_EQ(0, fstat(mfd, &stat));
+
+	ASSERT_EQ(stat.st_blksize, get_hpage_pmd_size());
+
+	close(mfd);
+}
+
 TEST(restrictedmem_tmpfile_no_mount_path)
 {
 	int mfd = memfd_restricted(RMFD_TMPFILE, NULL);
-- 
2.39.2.637.g21b0678d19-goog