diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 69087341d9ae..55da33b1d51c 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -479,6 +479,10 @@ static void __init xen_time_init(void)
 	int cpu = smp_processor_id();
 	struct timespec tp;
 
+	/* As Dom0 is never moved, no penalty on using TSC there */
+	if (xen_initial_domain())
+		xen_clocksource.rating = 275;
+
 	clocksource_register_hz(&xen_clocksource, NSEC_PER_SEC);
 
 	if (HYPERVISOR_vcpu_op(VCPUOP_stop_periodic_timer, cpu, NULL) == 0) {