diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 7a32976fa2a3644af886006478aa791cf1f3779f..8dc0605a9ce9e2d3b5df910fafd6eadb008bfb21 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -59,14 +59,16 @@ static int map_foreign_page(unsigned long lpfn, unsigned long fgmfn,
 	};
 	xen_ulong_t idx = fgmfn;
 	xen_pfn_t gpfn = lpfn;
+	int err = 0;
 
 	set_xen_guest_handle(xatp.idxs, &idx);
 	set_xen_guest_handle(xatp.gpfns, &gpfn);
+	set_xen_guest_handle(xatp.errs, &err);
 
 	rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
-	if (rc) {
-		pr_warn("Failed to map pfn to mfn rc:%d pfn:%lx mfn:%lx\n",
-			rc, lpfn, fgmfn);
+	if (rc || err) {
+		pr_warn("Failed to map pfn to mfn rc:%d:%d pfn:%lx mfn:%lx\n",
+			rc, err, lpfn, fgmfn);
 		return 1;
 	}
 	return 0;
diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index b40a4315cb8b0724a7ff373570c5526800dceee5..2ecfe4f700d94ce9adefdf423e235fe7c5e3d14c 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -190,6 +190,7 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap);
 
 #define XENMEM_add_to_physmap_range 23
 struct xen_add_to_physmap_range {
+    /* IN */
     /* Which domain to change the mapping for. */
     domid_t domid;
     uint16_t space; /* => enum phys_map_space */
@@ -203,6 +204,11 @@ struct xen_add_to_physmap_range {
 
     /* GPFN in domid where the source mapping page should appear. */
     GUEST_HANDLE(xen_pfn_t) gpfns;
+
+    /* OUT */
+
+    /* Per index error code. */
+    GUEST_HANDLE(int) errs;
 };
 DEFINE_GUEST_HANDLE_STRUCT(xen_add_to_physmap_range);