diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index 4d076b278b..9073398d6e 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_LIVEPATCH) += livepatch.o
 obj-y += mem_access.o
 obj-y += mm.o
 obj-y += monitor.o
+obj-$(CONFIG_NUMA) += numa.o
 obj-y += p2m.o
 obj-y += percpu.o
 obj-y += platform.o
diff --git a/xen/arch/arm/include/asm/numa.h b/xen/arch/arm/include/asm/numa.h
index 83f60ad05b..123a1a8dd0 100644
--- a/xen/arch/arm/include/asm/numa.h
+++ b/xen/arch/arm/include/asm/numa.h
@@ -22,7 +22,20 @@ typedef u8 nodeid_t;
  */
 #define NR_NODE_MEMBLKS NR_MEM_BANKS
 
+/*
+ * In ACPI spec, 0-9 are the reserved values for node distance,
+ * 10 indicates local node distance, 20 indicates remote node
+ * distance. Set node distance map in device tree will follow
+ * the ACPI's definition.
+ */
+#define NUMA_DISTANCE_UDF_MIN   0
+#define NUMA_DISTANCE_UDF_MAX   9
+#define NUMA_LOCAL_DISTANCE     10
+#define NUMA_REMOTE_DISTANCE    20
+
 extern bool numa_disabled(void);
+extern void numa_set_distance(nodeid_t from, nodeid_t to,
+                              unsigned int distance);
 
 #else
 
diff --git a/xen/arch/arm/numa.c b/xen/arch/arm/numa.c
index eb5d0632cb..c5ef81aad3 100644
--- a/xen/arch/arm/numa.c
+++ b/xen/arch/arm/numa.c
@@ -28,6 +28,11 @@ enum dt_numa_status {
 
 static enum dt_numa_status __ro_after_init device_tree_numa = DT_NUMA_DEFAULT;
 
+static unsigned char __ro_after_init
+node_distance_map[MAX_NUMNODES][MAX_NUMNODES] = {
+    { 0 }
+};
+
 void __init numa_fw_bad(void)
 {
     printk(KERN_ERR "NUMA: device tree numa info table not used.\n");
@@ -48,3 +53,50 @@ int __init arch_numa_setup(const char *opt)
 {
     return -EINVAL;
 }
+
+void __init numa_set_distance(nodeid_t from, nodeid_t to,
+                              unsigned int distance)
+{
+    if ( from >= ARRAY_SIZE(node_distance_map) ||
+         to >= ARRAY_SIZE(node_distance_map[0]) )
+    {
+        printk(KERN_WARNING
+               "NUMA: invalid nodes: from=%"PRIu8" to=%"PRIu8" MAX=%"PRIu8"\n",
+               from, to, MAX_NUMNODES);
+        return;
+    }
+
+    /* NUMA defines 0xff as an unreachable node and 0-9 are undefined */
+    if ( distance >= NUMA_NO_DISTANCE ||
+         (distance >= NUMA_DISTANCE_UDF_MIN &&
+          distance <= NUMA_DISTANCE_UDF_MAX) ||
+         (from == to && distance != NUMA_LOCAL_DISTANCE) )
+    {
+        printk(KERN_WARNING
+               "NUMA: invalid distance: from=%"PRIu8" to=%"PRIu8" distance=%"PRIu32"\n",
+               from, to, distance);
+        return;
+    }
+
+    node_distance_map[from][to] = distance;
+}
+
+unsigned char __node_distance(nodeid_t from, nodeid_t to)
+{
+    /* When NUMA is off, any distance will be treated as remote. */
+    if ( numa_disabled() )
+        return NUMA_REMOTE_DISTANCE;
+
+    /*
+     * Check whether the nodes are in the matrix range.
+     * When any node is out of range, except from and to nodes are the
+     * same, we treat them as unreachable (return 0xFF)
+     */
+    if ( from >= ARRAY_SIZE(node_distance_map) ||
+         to >= ARRAY_SIZE(node_distance_map[0]) )
+        return from == to ? NUMA_LOCAL_DISTANCE : NUMA_NO_DISTANCE;
+
+    return node_distance_map[from][to];
+}
+
+EXPORT_SYMBOL(__node_distance);
diff --git a/xen/arch/x86/include/asm/numa.h b/xen/arch/x86/include/asm/numa.h
index 7866afa408..45456ac441 100644
--- a/xen/arch/x86/include/asm/numa.h
+++ b/xen/arch/x86/include/asm/numa.h
@@ -22,7 +22,6 @@ extern void init_cpu_to_node(void);
 #define arch_want_default_dmazone() (num_online_nodes() > 1)
 
 void srat_parse_regions(paddr_t addr);
-extern u8 __node_distance(nodeid_t a, nodeid_t b);
 unsigned int arch_get_dma_bitsize(void);
 
 #endif
diff --git a/xen/arch/x86/srat.c b/xen/arch/x86/srat.c
index 56749ddca5..50faf5d352 100644
--- a/xen/arch/x86/srat.c
+++ b/xen/arch/x86/srat.c
@@ -328,7 +328,7 @@ unsigned int numa_node_to_arch_nid(nodeid_t n)
 	return 0;
 }
 
-u8 __node_distance(nodeid_t a, nodeid_t b)
+unsigned char __node_distance(nodeid_t a, nodeid_t b)
 {
 	unsigned index;
 	u8 slit_val;
diff --git a/xen/include/xen/numa.h b/xen/include/xen/numa.h
index b86d0851fc..8356e47b61 100644
--- a/xen/include/xen/numa.h
+++ b/xen/include/xen/numa.h
@@ -114,6 +114,7 @@ extern bool numa_memblks_available(void);
 extern bool numa_update_node_memblks(nodeid_t node, unsigned int arch_nid,
                                      paddr_t start, paddr_t size, bool hotplug);
 extern void numa_set_processor_nodes_parsed(nodeid_t node);
+extern unsigned char __node_distance(nodeid_t a, nodeid_t b);
 
 #else
 
