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Date: Wed, 16 Nov 2022 11:26:42 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, linux-alpha@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
sparclinux@...r.kernel.org, linux-um@...ts.infradead.org,
etnaviv@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
linux-samsung-soc@...r.kernel.org, linux-rdma@...r.kernel.org,
linux-media@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, linux-perf-users@...r.kernel.org,
linux-security-module@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Jason Gunthorpe <jgg@...pe.ca>,
John Hubbard <jhubbard@...dia.com>,
Peter Xu <peterx@...hat.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrea Arcangeli <aarcange@...hat.com>,
Hugh Dickins <hughd@...gle.com>, Nadav Amit <namit@...are.com>,
Vlastimil Babka <vbabka@...e.cz>,
Matthew Wilcox <willy@...radead.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
Muchun Song <songmuchun@...edance.com>,
Shuah Khan <shuah@...nel.org>,
Lucas Stach <l.stach@...gutronix.de>,
David Airlie <airlied@...il.com>,
Oded Gabbay <ogabbay@...nel.org>,
Arnd Bergmann <arnd@...db.de>,
Christoph Hellwig <hch@...radead.org>,
Alex Williamson <alex.williamson@...hat.com>,
David Hildenbrand <david@...hat.com>
Subject: [PATCH mm-unstable v1 03/20] selftests/vm: cow: R/O long-term pinning reliability tests for non-anon pages
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 <david@...hat.com>
---
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
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