KVM: selftests: Print expected and actual exit reason in KVM exit reason assert

Print what KVM exit reason a test was expecting and what it actually
got int TEST_ASSERT_KVM_EXIT_REASON().
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Message-Id: <20230204014547.583711-3-vipinsh@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tools/testing/selftests/kvm/include/test_util.h

@@ -67,7 +67,8 @@ void test_assert(bool exp, const char *exp_str,
 	__u32 exit_reason = (vcpu)->run->exit_reason;			\
 									\
 	TEST_ASSERT(exit_reason == (expected),				\
-		    "Unexpected exit reason: %u (%s)",			\
+		    "Wanted KVM exit reason: %u (%s), got: %u (%s)",    \
+		    (expected), exit_reason_str((expected)),		\
 		    exit_reason, exit_reason_str(exit_reason));		\
 } while (0)