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selftests: mm: gup_longterm: test unsharing logic when R/O pinning

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In our FOLL_LONGTERM tests, we prefault the page tables for the GUP-fast
test cases to be able to find a PTE and exercise the "longterm pinning
allowed" logic on the GUP-fast path where possible.

For now, we always prefault the page tables writable, resulting in PTEs
that are writable.

Let's cover more cases to also test if our unsharing logic works as
expected (and is able to make progress when there is nothing to unshare)
by mprotect'ing the range R/O when R/O-pinning, so we don't get PTEs that
are writable.

This change would have found an issue introduced by commit a12083d721
("mm/gup: handle hugepd for follow_page()"), whereby R/O pinning was not
able to make progress in all cases, because unsharing logic was not
provided with the VMA to decide at some point that long-term R/O pinning a
!anon page is fine.

Link: https://lkml.kernel.org/r/20240430131508.86924-1-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2024-04-30 15:15:08 +02:00 committed by Andrew Morton
parent cc48be374b
commit 67f4c91a44
1 changed files with 12 additions and 4 deletions
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16
tools/testing/selftests/mm/gup_longterm.c
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@ -118,15 +118,22 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
return;
}
/*
* Fault in the page writable such that GUP-fast can eventually pin
* it immediately.
*/
/* Fault in the page such that GUP-fast can pin it directly. */
memset(mem, 0, size);
switch (type) {
case TEST_TYPE_RO:
case TEST_TYPE_RO_FAST:
/*
* Cover more cases regarding unsharing decisions when
* long-term R/O pinning by mapping the page R/O.
*/
ret = mprotect(mem, size, PROT_READ);
if (ret) {
ksft_test_result_fail("mprotect() failed\n");
goto munmap;
}
/* FALLTHROUGH */
case TEST_TYPE_RW:
case TEST_TYPE_RW_FAST: {
struct pin_longterm_test args;
@ -228,6 +235,7 @@ static void do_test(int fd, size_t size, enum test_type type, bool shared)
assert(false);
}
munmap:
munmap(mem, size);
}