diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 47c1f21e81dca7d4b1abeb2ba4fca203215597c9..e9af113c572f0133010ec4a43f6cfc87da4fa4ae 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -261,6 +261,9 @@ config ZONE_DMA32
 config HAVE_GENERIC_GUP
 	def_bool y
 
+config ARCH_ENABLE_MEMORY_HOTPLUG
+	def_bool y
+
 config SMP
 	def_bool y
 
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index 6cde00554e9bbfa6151544bdc29196f560de81f2..4bfe0fc9edac66801b4758dfe98467392a5c4b45 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -291,6 +291,14 @@ int pfn_valid(unsigned long pfn)
 
 	if ((addr >> PAGE_SHIFT) != pfn)
 		return 0;
+
+#ifdef CONFIG_SPARSEMEM
+	if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
+		return 0;
+
+	if (!valid_section(__nr_to_section(pfn_to_section_nr(pfn))))
+		return 0;
+#endif
 	return memblock_is_map_memory(addr);
 }
 EXPORT_SYMBOL(pfn_valid);
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 674c409a8ce4e2b925df76bbbe81bc33a02f20f4..da513a1facf4fc4f1c45ecaab82321e5a1d1787f 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -1046,3 +1046,20 @@ int pud_free_pmd_page(pud_t *pudp, unsigned long addr)
 	pmd_free(NULL, table);
 	return 1;
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap,
+		    bool want_memblock)
+{
+	int flags = 0;
+
+	if (rodata_full || debug_pagealloc_enabled())
+		flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
+
+	__create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start),
+			     size, PAGE_KERNEL, pgd_pgtable_alloc, flags);
+
+	return __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT,
+			   altmap, want_memblock);
+}
+#endif
diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 27a31efd9e8e9ba569651961e325c3e2c6c5b32f..ae34e3a1cef1c87eaedf28081bbdcd85bfceb86f 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -466,3 +466,13 @@ void __init arm64_numa_init(void)
 
 	numa_init(dummy_numa_init);
 }
+
+/*
+ * We hope that we will be hotplugging memory on nodes we already know about,
+ * such that acpi_get_node() succeeds and we never fall back to this...
+ */
+int memory_add_physaddr_to_nid(u64 addr)
+{
+	pr_warn("Unknown node for memory at 0x%llx, assuming node 0\n", addr);
+	return 0;
+}