Access the same memory addresses on each iteration of the memstress guest code. This ensures that the state of KVM's page tables is the same after every iteration, including the pages that host the guest page tables for args and vcpu_args. This difference is visible on the dirty_log_page_splitting_test on AMD machines. Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> --- tools/testing/selftests/kvm/lib/memstress.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/kvm/lib/memstress.c b/tools/testing/selftests/kvm/lib/memstress.c index 3632956c6bcf..df457452d146 100644 --- a/tools/testing/selftests/kvm/lib/memstress.c +++ b/tools/testing/selftests/kvm/lib/memstress.c @@ -65,6 +65,9 @@ void memstress_guest_code(uint32_t vcpu_idx) GUEST_ASSERT(vcpu_args->vcpu_idx == vcpu_idx); while (true) { + for (i = 0; i < sizeof(memstress_args); i += args->guest_page_size) + (void) *((volatile char *)args + i); + for (i = 0; i < pages; i++) { if (args->random_access) page = guest_random_u32(&rand_state) % pages; -- 2.39.1