[PATCH v4 3/3] KVM: selftests: Don't limit LE dirty-bitmap bitops to s390x
From: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Date: 2026-09-11 04:49:25
Also in:
kvm, lkml
Subsystem:
kernel selftest framework, kernel virtual machine (kvm), the rest · Maintainers:
Shuah Khan, Shuah Khan, Paolo Bonzini, Linus Torvalds
dirty_log_test already has BITOP_LE_SWIZZLE helpers, but they were
compiled in only for s390x, so every other big-endian host used native
test_bit().
The test fails on big-endian powerpc because it treated dirty host pages
as clean (because of the endianness issue)
w/o the fix the test fails with:
Clear page 1 value (1) >= iteration (1)
Fixes: a049a377164c ("KVM: selftests: Enable dirty_log_test on s390x")
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
---
tools/testing/selftests/kvm/dirty_log_test.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index af5eb0334a74..8189eaac713c 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c@@ -44,8 +44,11 @@ #define TEST_MIN_WRITES_PER_ITERATION 0x100 /* Dirty bitmaps are always little endian, so we need to swap on big endian */ -#if defined(__s390x__) +#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ # define BITOP_LE_SWIZZLE ((BITS_PER_LONG-1) & ~0x7) +#else +# define BITOP_LE_SWIZZLE 0 +#endif # define test_bit_le(nr, addr) \ test_bit((nr) ^ BITOP_LE_SWIZZLE, addr) # define __set_bit_le(nr, addr) \
@@ -56,13 +59,6 @@ __test_and_set_bit((nr) ^ BITOP_LE_SWIZZLE, addr) # define __test_and_clear_bit_le(nr, addr) \ __test_and_clear_bit((nr) ^ BITOP_LE_SWIZZLE, addr) -#else -# define test_bit_le test_bit -# define __set_bit_le __set_bit -# define __clear_bit_le __clear_bit -# define __test_and_set_bit_le __test_and_set_bit -# define __test_and_clear_bit_le __test_and_clear_bit -#endif #define TEST_DIRTY_RING_COUNT 65536 --
2.39.5