Subject: [PATCH mm-unstable v1 03/20] selftests/vm: cow: R/O long-term pinning reliability tests for non-anon pages

From: David Hildenbrand <[email-masked]>
Date: Wed, 16 Nov 2022 11:26:42 +0100

Let's test whether R/O long-term pinning is reliable for non-anonymous
memory: when R/O long-term pinning a page, the expectation is that we
break COW early before pinning, such that actual write access via the
page tables won't break COW later and end up replacing the R/O-pinned
page in the page table.

Consequently, R/O long-term pinning in private mappings would only target
exclusive anonymous pages.

For now, all tests fail:
	# [RUN] R/O longterm GUP pin ... with shared zeropage
	not ok 151 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP pin ... with memfd
	not ok 152 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP pin ... with tmpfile
	not ok 153 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP pin ... with huge zeropage
	not ok 154 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP pin ... with memfd hugetlb (2048 kB)
	not ok 155 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP pin ... with memfd hugetlb (1048576 kB)
	not ok 156 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP-fast pin ... with shared zeropage
	not ok 157 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP-fast pin ... with memfd
	not ok 158 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP-fast pin ... with tmpfile
	not ok 159 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP-fast pin ... with huge zeropage
	not ok 160 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP-fast pin ... with memfd hugetlb (2048 kB)
	not ok 161 Longterm R/O pin is reliable
	# [RUN] R/O longterm GUP-fast pin ... with memfd hugetlb (1048576 kB)
	not ok 162 Longterm R/O pin is reliable

Signed-off-by: David Hildenbrand <[email-masked]>
---
 tools/testing/selftests/vm/cow.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/vm/cow.c b/tools/testing/selftests/vm/cow.c
index fb07bd44529c..73e05b52c49e 100644
--- a/tools/testing/selftests/vm/cow.c
+++ b/tools/testing/selftests/vm/cow.c
@@ -561,6 +561,7 @@ static void test_iouring_fork(char *mem, size_t size)
 #endif /* LOCAL_CONFIG_HAVE_LIBURING */
 
 enum ro_pin_test {
+	RO_PIN_TEST,
 	RO_PIN_TEST_SHARED,
 	RO_PIN_TEST_PREVIOUSLY_SHARED,
 	RO_PIN_TEST_RO_EXCLUSIVE,
@@ -593,6 +594,8 @@ static void do_test_ro_pin(char *mem, size_t size, enum ro_pin_test test,
 	}
 
 	switch (test) {
+	case RO_PIN_TEST:
+		break;
 	case RO_PIN_TEST_SHARED:
 	case RO_PIN_TEST_PREVIOUSLY_SHARED:
 		/*
@@ -1193,6 +1196,16 @@ static void test_cow(char *mem, const char *smem, size_t size)
 	free(old);
 }
 
+static void test_ro_pin(char *mem, const char *smem, size_t size)
+{
+	do_test_ro_pin(mem, size, RO_PIN_TEST, false);
+}
+
+static void test_ro_fast_pin(char *mem, const char *smem, size_t size)
+{
+	do_test_ro_pin(mem, size, RO_PIN_TEST, true);
+}
+
 static void run_with_zeropage(non_anon_test_fn fn, const char *desc)
 {
 	char *mem, *smem, tmp;
@@ -1433,7 +1446,7 @@ struct non_anon_test_case {
 };
 
 /*
- * Test cases that target any pages in private mappings that are non anonymous:
+ * Test cases that target any pages in private mappings that are not anonymous:
  * pages that may get shared via COW ndependent of fork(). This includes
  * the shared zeropage(s), pagecache pages, ...
  */
@@ -1446,6 +1459,19 @@ static const struct non_anon_test_case non_anon_test_cases[] = {
 		"Basic COW",
 		test_cow,
 	},
+	/*
+	 * Take a R/O longterm pin. When modifying the page via the page table,
+	 * the page content change must be visible via the pin.
+	 */
+	{
+		"R/O longterm GUP pin",
+		test_ro_pin,
+	},
+	/* Same as above, but using GUP-fast. */
+	{
+		"R/O longterm GUP-fast pin",
+		test_ro_fast_pin,
+	},
 };
 
 static void run_non_anon_test_case(struct non_anon_test_case const *test_case)
-- 
2.38.1