diff --git a/xen/arch/Kconfig b/xen/arch/Kconfig
index cf0acb7e89..1954d1c5c1 100644
--- a/xen/arch/Kconfig
+++ b/xen/arch/Kconfig
@@ -3,6 +3,9 @@ config NR_CPUS
 	int "Maximum number of physical CPUs"
 	range 1 4095
 	default "256" if X86
+	default "8" if ARM && RCAR3
+	default "4" if ARM && QEMU
+	default "4" if ARM && MPSOC
 	default "128" if ARM
 	---help---
 	  Specifies the maximum number of physical CPUs which Xen will support.