diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h
index effef3713c5a..7baf2cc04e1e 100644
--- a/arch/arm64/include/asm/efi.h
+++ b/arch/arm64/include/asm/efi.h
@@ -6,11 +6,9 @@
 
 #ifdef CONFIG_EFI
 extern void efi_init(void);
-extern void efi_idmap_init(void);
 extern void efi_virtmap_init(void);
 #else
 #define efi_init()
-#define efi_idmap_init()
 #define efi_virtmap_init()
 #endif
 
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h
index 5fd40c43be80..3d311761e3c2 100644
--- a/arch/arm64/include/asm/mmu.h
+++ b/arch/arm64/include/asm/mmu.h
@@ -31,8 +31,6 @@ extern void paging_init(void);
 extern void setup_mm_for_reboot(void);
 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
 extern void init_mem_pgprot(void);
-/* create an identity mapping for memory (or io if map_io is true) */
-extern void create_id_mapping(phys_addr_t addr, phys_addr_t size, int map_io);
 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
 			       unsigned long virt, phys_addr_t size,
 			       pgprot_t prot);
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 4a5d7343dddd..a98415b5979c 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -54,27 +54,6 @@ static int __init is_normal_ram(efi_memory_desc_t *md)
 	return 0;
 }
 
-static void __init efi_setup_idmap(void)
-{
-	struct memblock_region *r;
-	efi_memory_desc_t *md;
-	u64 paddr, npages, size;
-
-	for_each_memblock(memory, r)
-		create_id_mapping(r->base, r->size, 0);
-
-	/* map runtime io spaces */
-	for_each_efi_memory_desc(&memmap, md) {
-		if (!(md->attribute & EFI_MEMORY_RUNTIME) || is_normal_ram(md))
-			continue;
-		paddr = md->phys_addr;
-		npages = md->num_pages;
-		memrange_efi_to_native(&paddr, &npages);
-		size = npages << PAGE_SHIFT;
-		create_id_mapping(paddr, size, 1);
-	}
-}
-
 /*
  * Translate a EFI virtual address into a physical address: this is necessary,
  * as some data members of the EFI system table are virtually remapped after
@@ -236,16 +215,6 @@ void __init efi_init(void)
 	reserve_regions();
 }
 
-void __init efi_idmap_init(void)
-{
-	if (!efi_enabled(EFI_BOOT))
-		return;
-
-	/* boot time idmap_pg_dir is incomplete, so fill in missing parts */
-	efi_setup_idmap();
-	early_memunmap(memmap.map, memmap.map_end - memmap.map);
-}
-
 /*
  * Enable the UEFI Runtime Services if all prerequisites are in place, i.e.,
  * non-early mapping of the UEFI system table and virtual mappings for all
@@ -386,4 +355,5 @@ void __init efi_virtmap_init(void)
 		create_pgd_mapping(&efi_mm, paddr, md->virt_addr, size, prot);
 	}
 	set_bit(EFI_VIRTMAP, &efi.flags);
+	early_memunmap(memmap.map, memmap.map_end - memmap.map);
 }
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index beac8188fdbd..199d1b7809d7 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -402,7 +402,6 @@ void __init setup_arch(char **cmdline_p)
 	request_standard_resources();
 
 	efi_virtmap_init();
-	efi_idmap_init();
 	early_ioremap_reset();
 
 	unflatten_device_tree();
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 3f3d5aa4a8b1..328638548871 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -271,18 +271,6 @@ static void __init create_mapping(phys_addr_t phys, unsigned long virt,
 			 size, PAGE_KERNEL_EXEC);
 }
 
-void __init create_id_mapping(phys_addr_t addr, phys_addr_t size, int map_io)
-{
-	if ((addr >> PGDIR_SHIFT) >= ARRAY_SIZE(idmap_pg_dir)) {
-		pr_warn("BUG: not creating id mapping for %pa\n", &addr);
-		return;
-	}
-	__create_mapping(&init_mm, &idmap_pg_dir[pgd_index(addr)],
-			 addr, addr, size,
-			 map_io ? __pgprot(PROT_DEVICE_nGnRE)
-				: PAGE_KERNEL_EXEC);
-}
-
 void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
 			       unsigned long virt, phys_addr_t size,
 			       pgprot_t prot)