diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index b27ddce5d324..17d53001f812 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -282,6 +282,7 @@ extern void try_offline_node(int nid);
 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
 			 struct zone *zone, struct memory_group *group);
 extern int remove_memory(u64 start, u64 size);
+extern int remove_memory_subsection(u64 start, u64 size);
 extern void __remove_memory(u64 start, u64 size);
 extern int offline_and_remove_memory(u64 start, u64 size);
 
@@ -306,6 +307,7 @@ static inline void __remove_memory(u64 start, u64 size) {}
 extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat);
 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
+extern int add_memory_subsection(int nid, u64 start, u64 size);
 extern int add_memory_resource(int nid, struct resource *resource,
 			       mhp_t mhp_flags);
 extern int add_memory_driver_managed(int nid, u64 start, u64 size,
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 619445096ef4..fc14833ae953 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1607,6 +1607,46 @@ int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags)
 }
 EXPORT_SYMBOL_GPL(add_memory);
 
+int add_memory_subsection(int nid, u64 start, u64 size)
+{
+	struct mhp_params params = { .pgprot = PAGE_KERNEL };
+	struct resource *res;
+	int ret;
+
+	if (size == memory_block_size_bytes())
+		return add_memory(nid, start, size, MHP_NONE);
+
+	if (!IS_ALIGNED(start, SUBSECTION_SIZE) ||
+	    !IS_ALIGNED(size, SUBSECTION_SIZE)) {
+		pr_err("%s: start 0x%llx size 0x%llx not aligned to subsection size\n",
+			   __func__, start, size);
+		return -EINVAL;
+	}
+
+	res = register_memory_resource(start, size, "System RAM");
+	if (IS_ERR(res))
+		return PTR_ERR(res);
+
+	mem_hotplug_begin();
+
+	nid = memory_add_physaddr_to_nid(start);
+
+	if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
+		memblock_add_node(start, size, nid, MEMBLOCK_NONE);
+
+	ret = arch_add_memory(nid, start, size, &params);
+	if (ret) {
+		if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
+			memblock_remove(start, size);
+		pr_err("%s failed to add subsection start 0x%llx size 0x%llx\n",
+			   __func__, start, size);
+	}
+	mem_hotplug_done();
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(add_memory_subsection);
+
 /*
  * Add special, driver-managed memory to the system as system RAM. Such
  * memory is not exposed via the raw firmware-provided memmap as system
@@ -2320,6 +2360,40 @@ int remove_memory(u64 start, u64 size)
 }
 EXPORT_SYMBOL_GPL(remove_memory);
 
+int remove_memory_subsection(u64 start, u64 size)
+{
+	if (size ==  memory_block_size_bytes())
+		return remove_memory(start, size);
+
+	if (!IS_ALIGNED(start, SUBSECTION_SIZE) ||
+	    !IS_ALIGNED(size, SUBSECTION_SIZE)) {
+		pr_err("%s: start 0x%llx size 0x%llx not aligned to subsection size\n",
+			   __func__, start, size);
+		return -EINVAL;
+	}
+
+	mem_hotplug_begin();
+
+	if (test_pages_isolated(start, start + size, MEMORY_OFFLINE)) {
+		pr_err("%s: [%llx, %llx) PFNs are not isolated\n",
+			   __func__, start, start + size);
+		mem_hotplug_done();
+		return -EBUSY;
+	}
+
+	arch_remove_memory(start, size, NULL);
+
+	if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK))
+		memblock_remove(start, size);
+
+	release_mem_region_adjustable(start, size);
+
+	mem_hotplug_done();
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(remove_memory_subsection);
+
 static int try_offline_memory_block(struct memory_block *mem, void *arg)
 {
 	uint8_t online_type = MMOP_ONLINE_KERNEL;