diff --git a/tools/testing/selftests/kvm/memslot_perf_test.c b/tools/testing/selftests/kvm/memslot_perf_test.c
index 1e241390e11e..db2fd3c59d49 100644
--- a/tools/testing/selftests/kvm/memslot_perf_test.c
+++ b/tools/testing/selftests/kvm/memslot_perf_test.c
@@ -30,7 +30,7 @@
 #define MEM_EXTRA_SIZE		SZ_64K
 
 #define MEM_SIZE		(SZ_512M + MEM_EXTRA_SIZE)
-#define MEM_GPA			SZ_256M
+#define MEM_GPA			SZ_512M
 #define MEM_AUX_GPA		MEM_GPA
 #define MEM_SYNC_GPA		MEM_AUX_GPA
 #define MEM_TEST_GPA		(MEM_AUX_GPA + MEM_EXTRA_SIZE)