diff --git a/arch/arm/include/asm/efi.h b/arch/arm/include/asm/efi.h
index e0eea72..5ba4343 100644
--- a/arch/arm/include/asm/efi.h
+++ b/arch/arm/include/asm/efi.h
@@ -52,9 +52,11 @@ static inline void efi_set_pgd(struct mm_struct *mm)
 
 void efi_virtmap_load(void);
 void efi_virtmap_unload(void);
+int xen_arm_enable_runtime_services(void);
 
 #else
 #define efi_init()
+#define xen_arm_enable_runtime_services() (0)
 #endif /* CONFIG_EFI */
 
 /* arch specific definitions used by the stub code */
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 13e3e9f..3362870 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -16,6 +16,7 @@
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>
 #include <asm/system_misc.h>
+#include <asm/efi.h>
 #include <linux/interrupt.h>
 #include <linux/irqreturn.h>
 #include <linux/module.h>
@@ -261,6 +262,13 @@ static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
 	    !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
 		hyper_node.version = s + strlen(hyper_node.prefix);
 
+	if (IS_ENABLED(CONFIG_XEN_EFI)) {
+		/* Check if Xen supports EFI */
+		if ((of_get_flat_dt_subnode_by_name(node, "uefi") > 0) &&
+		    !efi_runtime_disabled())
+			set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
+	}
+
 	return 0;
 }
 
@@ -338,6 +346,7 @@ static int __init xen_guest_init(void)
 {
 	struct xen_add_to_physmap xatp;
 	struct shared_info *shared_info_page = NULL;
+	int ret;
 
 	if (!xen_domain())
 		return 0;
@@ -352,6 +361,13 @@ static int __init xen_guest_init(void)
 		return -ENODEV;
 	}
 
+	if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_BOOT) &&
+	    efi_enabled(EFI_RUNTIME_SERVICES)) {
+		ret = xen_arm_enable_runtime_services();
+		if (ret)
+			return ret;
+	}
+
 	shared_info_page = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
 
 	if (!shared_info_page) {
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index 8e88a69..574bee5 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h
@@ -8,8 +8,10 @@
 
 #ifdef CONFIG_EFI
 extern void efi_init(void);
+int xen_arm_enable_runtime_services(void);
 #else
 #define efi_init()
+#define xen_arm_enable_runtime_services() (0)
 #endif
 
 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md);
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 6ae21e4..211ec10 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -27,6 +27,7 @@
 #include <asm/mmu.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
+#include <asm/xen/xen-ops.h>
 
 extern u64 efi_system_table;
 
@@ -39,6 +40,33 @@ static struct mm_struct efi_mm = {
 	.mmlist			= LIST_HEAD_INIT(efi_mm.mmlist),
 };
 
+static int __init efi_remap_init(void)
+{
+	u64 mapsize;
+
+	pr_info("Remapping and enabling EFI services.\n");
+
+	mapsize = memmap.map_end - memmap.map;
+	memmap.map = (__force void *)ioremap_cache(memmap.phys_map,
+						   mapsize);
+	if (!memmap.map) {
+		pr_err("Failed to remap EFI memory map\n");
+		return -ENOMEM;
+	}
+	memmap.map_end = memmap.map + mapsize;
+	efi.memmap = &memmap;
+
+	efi.systab = (__force void *)ioremap_cache(efi_system_table,
+						   sizeof(efi_system_table_t));
+	if (!efi.systab) {
+		pr_err("Failed to remap EFI System Table\n");
+		return -ENOMEM;
+	}
+	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
+
+	return 0;
+}
+
 static bool __init efi_virtmap_init(void)
 {
 	efi_memory_desc_t *md;
@@ -75,7 +103,7 @@ static bool __init efi_virtmap_init(void)
  */
 static int __init arm_enable_runtime_services(void)
 {
-	u64 mapsize;
+	int ret;
 
 	if (!efi_enabled(EFI_BOOT)) {
 		pr_info("EFI services will not be available.\n");
@@ -87,25 +115,14 @@ static int __init arm_enable_runtime_services(void)
 		return 0;
 	}
 
-	pr_info("Remapping and enabling EFI services.\n");
-
-	mapsize = memmap.map_end - memmap.map;
-	memmap.map = (__force void *)ioremap_cache(memmap.phys_map,
-						   mapsize);
-	if (!memmap.map) {
-		pr_err("Failed to remap EFI memory map\n");
-		return -ENOMEM;
+	if (efi_enabled(EFI_RUNTIME_SERVICES)) {
+		pr_info("EFI runtime services access via paravirt.\n");
+		return 0;
 	}
-	memmap.map_end = memmap.map + mapsize;
-	efi.memmap = &memmap;
 
-	efi.systab = (__force void *)ioremap_cache(efi_system_table,
-						   sizeof(efi_system_table_t));
-	if (!efi.systab) {
-		pr_err("Failed to remap EFI System Table\n");
-		return -ENOMEM;
-	}
-	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
+	ret = efi_remap_init();
+	if (ret)
+		return ret;
 
 	if (!efi_virtmap_init()) {
 		pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");
@@ -122,6 +139,23 @@ static int __init arm_enable_runtime_services(void)
 }
 early_initcall(arm_enable_runtime_services);
 
+int __init xen_arm_enable_runtime_services(void)
+{
+	int ret;
+
+	ret = efi_remap_init();
+	if (ret)
+		return ret;
+
+	if (IS_ENABLED(CONFIG_XEN_EFI)) {
+		/* Set up runtime services function pointers for Xen Dom0 */
+		xen_efi_runtime_setup();
+		efi.runtime_version = efi.systab->hdr.revision;
+	}
+
+	return 0;
+}
+
 void efi_virtmap_load(void)
 {
 	preempt_disable();
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 3a69ed5..f586e1e 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -469,12 +469,14 @@ device_initcall(efi_load_efivars);
 		FIELD_SIZEOF(struct efi_fdt_params, field) \
 	}
 
-static __initdata struct {
+struct params {
 	const char name[32];
 	const char propname[32];
 	int offset;
 	int size;
-} dt_params[] = {
+};
+
+static __initdata struct params fdt_params[] = {
 	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
 	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
 	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
@@ -482,44 +484,91 @@ static __initdata struct {
 	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
 };
 
+static __initdata struct params xen_fdt_params[] = {
+	UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
+	UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
+	UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
+	UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
+	UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
+};
+
+#define EFI_FDT_PARAMS_SIZE	ARRAY_SIZE(fdt_params)
+
+static __initdata struct {
+	const char *uname;
+	const char *subnode;
+	struct params *params;
+} dt_params[] = {
+	{ "hypervisor", "uefi", xen_fdt_params },
+	{ "chosen", NULL, fdt_params },
+};
+
 struct param_info {
 	int found;
 	void *params;
+	const char *missing;
 };
 
-static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
-				       int depth, void *data)
+static int __init __find_uefi_params(unsigned long node,
+				     struct param_info *info,
+				     struct params *params)
 {
-	struct param_info *info = data;
 	const void *prop;
 	void *dest;
 	u64 val;
 	int i, len;
 
-	if (depth != 1 || strcmp(uname, "chosen") != 0)
-		return 0;
-
-	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
-		prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
-		if (!prop)
+	for (i = 0; i < EFI_FDT_PARAMS_SIZE; i++) {
+		prop = of_get_flat_dt_prop(node, params[i].propname, &len);
+		if (!prop) {
+			info->missing = params[i].name;
 			return 0;
-		dest = info->params + dt_params[i].offset;
+		}
+
+		dest = info->params + params[i].offset;
 		info->found++;
 
 		val = of_read_number(prop, len / sizeof(u32));
 
-		if (dt_params[i].size == sizeof(u32))
+		if (params[i].size == sizeof(u32))
 			*(u32 *)dest = val;
 		else
 			*(u64 *)dest = val;
 
 		if (efi_enabled(EFI_DBG))
-			pr_info("  %s: 0x%0*llx\n", dt_params[i].name,
-				dt_params[i].size * 2, val);
+			pr_info("  %s: 0x%0*llx\n", params[i].name,
+				params[i].size * 2, val);
 	}
+
 	return 1;
 }
 
+static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
+				       int depth, void *data)
+{
+	struct param_info *info = data;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+		const char *subnode = dt_params[i].subnode;
+
+		if (depth != 1 || strcmp(uname, dt_params[i].uname) != 0) {
+			info->missing = dt_params[i].params[0].name;
+			continue;
+		}
+
+		if (subnode) {
+			node = of_get_flat_dt_subnode_by_name(node, subnode);
+			if (node < 0)
+				return 0;
+		}
+
+		return __find_uefi_params(node, info, dt_params[i].params);
+	}
+
+	return 0;
+}
+
 int __init efi_get_fdt_params(struct efi_fdt_params *params)
 {
 	struct param_info info;
@@ -535,7 +584,7 @@ int __init efi_get_fdt_params(struct efi_fdt_params *params)
 		pr_info("UEFI not found.\n");
 	else if (!ret)
 		pr_err("Can't find '%s' in device tree!\n",
-		       dt_params[info.found].name);
+		       info.missing);
 
 	return ret;
 }
