[ Upstream commit bffed38d4fb536c5d5d6c37846a7fb8fde1452fa ]
The memory slot size must be aligned to the host's page size. When
testing a guest with a 4k page size on a host with a 64k page size,
then 3 guest pages are not host page size aligned. Since we just need
a nearly arbitrary number of extra pages to ensure the memslot is not
aligned to a 64 host-page boundary for this test, then we can use
16, as that's 64k aligned, but not 64 * 64k aligned.
Fixes: 76d58e0f07ec ("KVM: fix KVM_CLEAR_DIRTY_LOG for memory slots of unaligned size", 2019-04-17)
Signed-off-by: Andrew Jones <drjones@xxxxxxxxxx>
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/testing/selftests/kvm/dirty_log_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index 93f99c6b7d79..a2542ed42819 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -292,7 +292,7 @@ static void run_test(enum vm_guest_mode mode, unsigned long iterations,
* A little more than 1G of guest page sized pages. Cover the
* case where the size is not aligned to 64 pages.
*/
- guest_num_pages = (1ul << (30 - guest_page_shift)) + 3;
+ guest_num_pages = (1ul << (30 - guest_page_shift)) + 16;
host_page_size = getpagesize();
host_num_pages = (guest_num_pages * guest_page_size) / host_page_size +
!!((guest_num_pages * guest_page_size) % host_page_size);
--
2.20.1
