[PATCH 08/20] KVM: selftests: Limit dirty_log_test's s390x workaround to s390x

Sean Christopherson
2024-12-14T01:07:38Z

From: Maxim Levitsky <mlevitsk@redhat.com>

s390 specific workaround causes the dirty-log mode of the test to dirty
all guest memory on the first iteration, which is very slow when the test
is run in a nested VM.

Limit this workaround to s390x.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
tools/testing/selftests/kvm/dirty_log_test.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c
index 2aee047b8b1c..55a385499434 100644
--- a/tools/testing/selftests/kvm/dirty_log_test.c
+++ b/tools/testing/selftests/kvm/dirty_log_test.c
@@ -98,6 +98,7 @@ static void guest_code(void)
uint64_t addr;
int i;

+#ifdef __s390x__
/*
* On s390x, all pages of a 1M segment are initially marked as dirty
* when a page of the segment is written to for the very first time.
@@ -108,6 +109,7 @@ static void guest_code(void)
addr = guest_test_virt_mem + i * guest_page_size;
vcpu_arch_put_guest(*(uint64_t *)addr, READ_ONCE(iteration));
}
+#endif

while (true) {
for (i = 0; i < TEST_PAGES_PER_LOOP; i++) {
--
2.47.1.613.gc27f4b7a9f-goog