linux-kernel - [PATCH 2/4] KVM: selftests: dirty_log_test: Limit s390x workaround to s390x

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Message-Id: <20241211193706.469817-3-mlevitsk@redhat.com>
Date: Wed, 11 Dec 2024 14:37:04 -0500
From: Maxim Levitsky <mlevitsk@...hat.com>
To: kvm@...r.kernel.org
Cc: linux-kselftest@...r.kernel.org,
	Sean Christopherson <seanjc@...gle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-kernel@...r.kernel.org,
	x86@...nel.org,
	Maxim Levitsky <mlevitsk@...hat.com>
Subject: [PATCH 2/4] KVM: selftests: dirty_log_test: Limit s390x workaround to s390x

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

Limit this workaround to s390x.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.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 aacf80f57439..f60e2aceeae0 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++) {
-- 
2.26.3