diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 5e56abc1e2f1..4ac8d61f7c3e 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -1078,6 +1078,7 @@ int  generic_map_update_batch(struct bpf_map *map,
 int  generic_map_delete_batch(struct bpf_map *map,
 			      const union bpf_attr *attr,
 			      union bpf_attr __user *uattr);
+struct bpf_map *bpf_map_get_curr_or_next(u32 *id);
 
 extern int sysctl_unprivileged_bpf_disabled;
 
@@ -1118,7 +1119,16 @@ struct bpf_iter_reg {
 	u32 target_feature;
 };
 
+struct bpf_iter_meta {
+	__bpf_md_ptr(struct seq_file *, seq);
+	u64 session_id;
+	u64 seq_num;
+};
+
 int bpf_iter_reg_target(struct bpf_iter_reg *reg_info);
+struct bpf_prog *bpf_iter_get_prog(struct seq_file *seq, u32 priv_data_size,
+				   u64 *session_id, u64 *seq_num, bool is_last);
+int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx);
 
 int bpf_percpu_hash_copy(struct bpf_map *map, void *key, void *value);
 int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value);
diff --git a/kernel/bpf/Makefile b/kernel/bpf/Makefile
index 6a8b0febd3f6..b2b5eefc5254 100644
--- a/kernel/bpf/Makefile
+++ b/kernel/bpf/Makefile
@@ -2,7 +2,7 @@
 obj-y := core.o
 CFLAGS_core.o += $(call cc-disable-warning, override-init)
 
-obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o
+obj-$(CONFIG_BPF_SYSCALL) += syscall.o verifier.o inode.o helpers.o tnum.o bpf_iter.o map_iter.o
 obj-$(CONFIG_BPF_SYSCALL) += hashtab.o arraymap.o percpu_freelist.o bpf_lru_list.o lpm_trie.o map_in_map.o
 obj-$(CONFIG_BPF_SYSCALL) += local_storage.o queue_stack_maps.o
 obj-$(CONFIG_BPF_SYSCALL) += disasm.o
diff --git a/kernel/bpf/bpf_iter.c b/kernel/bpf/bpf_iter.c
index 1115b978607a..284c95587803 100644
--- a/kernel/bpf/bpf_iter.c
+++ b/kernel/bpf/bpf_iter.c
@@ -48,3 +48,22 @@ int bpf_iter_reg_target(struct bpf_iter_reg *reg_info)
 
 	return 0;
 }
+
+struct bpf_prog *bpf_iter_get_prog(struct seq_file *seq, u32 priv_data_size,
+				   u64 *session_id, u64 *seq_num, bool is_last)
+{
+	return NULL;
+}
+
+int bpf_iter_run_prog(struct bpf_prog *prog, void *ctx)
+{
+	int ret;
+
+	migrate_disable();
+	rcu_read_lock();
+	ret = BPF_PROG_RUN(prog, ctx);
+	rcu_read_unlock();
+	migrate_enable();
+
+	return ret;
+}
diff --git a/kernel/bpf/map_iter.c b/kernel/bpf/map_iter.c
new file mode 100644
index 000000000000..bb3ad4c3bde5
--- /dev/null
+++ b/kernel/bpf/map_iter.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (c) 2020 Facebook */
+#include <linux/bpf.h>
+#include <linux/fs.h>
+#include <linux/filter.h>
+#include <linux/kernel.h>
+
+struct bpf_iter_seq_map_info {
+	struct bpf_map *map;
+	u32 id;
+};
+
+static void *bpf_map_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	struct bpf_iter_seq_map_info *info = seq->private;
+	struct bpf_map *map;
+	u32 id = info->id;
+
+	map = bpf_map_get_curr_or_next(&id);
+	if (IS_ERR_OR_NULL(map))
+		return NULL;
+
+	++*pos;
+	info->map = map;
+	info->id = id;
+	return map;
+}
+
+static void *bpf_map_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct bpf_iter_seq_map_info *info = seq->private;
+	struct bpf_map *map;
+
+	++*pos;
+	++info->id;
+	map = bpf_map_get_curr_or_next(&info->id);
+	if (IS_ERR_OR_NULL(map))
+		return NULL;
+
+	bpf_map_put(info->map);
+	info->map = map;
+	return map;
+}
+
+struct bpf_iter__bpf_map {
+	__bpf_md_ptr(struct bpf_iter_meta *, meta);
+	__bpf_md_ptr(struct bpf_map *, map);
+};
+
+int __init __bpf_iter__bpf_map(struct bpf_iter_meta *meta, struct bpf_map *map)
+{
+	return 0;
+}
+
+static int bpf_map_seq_show(struct seq_file *seq, void *v)
+{
+	struct bpf_iter_meta meta;
+	struct bpf_iter__bpf_map ctx;
+	struct bpf_prog *prog;
+	int ret = 0;
+
+	ctx.meta = &meta;
+	ctx.map = v;
+	meta.seq = seq;
+	prog = bpf_iter_get_prog(seq, sizeof(struct bpf_iter_seq_map_info),
+				 &meta.session_id, &meta.seq_num,
+				 v == (void *)0);
+	if (prog)
+		ret = bpf_iter_run_prog(prog, &ctx);
+
+	return ret == 0 ? 0 : -EINVAL;
+}
+
+static void bpf_map_seq_stop(struct seq_file *seq, void *v)
+{
+	struct bpf_iter_seq_map_info *info = seq->private;
+
+	if (!v)
+		bpf_map_seq_show(seq, v);
+
+	if (info->map) {
+		bpf_map_put(info->map);
+		info->map = NULL;
+	}
+}
+
+static const struct seq_operations bpf_map_seq_ops = {
+	.start	= bpf_map_seq_start,
+	.next	= bpf_map_seq_next,
+	.stop	= bpf_map_seq_stop,
+	.show	= bpf_map_seq_show,
+};
+
+static int __init bpf_map_iter_init(void)
+{
+	struct bpf_iter_reg reg_info = {
+		.target			= "bpf_map",
+		.target_func_name	= "__bpf_iter__bpf_map",
+		.seq_ops		= &bpf_map_seq_ops,
+		.seq_priv_size		= sizeof(struct bpf_iter_seq_map_info),
+		.target_feature		= 0,
+	};
+
+	return bpf_iter_reg_target(&reg_info);
+}
+
+late_initcall(bpf_map_iter_init);
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 7626b8024471..022187640943 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2800,6 +2800,19 @@ static int bpf_obj_get_next_id(const union bpf_attr *attr,
 	return err;
 }
 
+struct bpf_map *bpf_map_get_curr_or_next(u32 *id)
+{
+	struct bpf_map *map;
+
+	spin_lock_bh(&map_idr_lock);
+	map = idr_get_next(&map_idr, id);
+	if (map)
+		map = __bpf_map_inc_not_zero(map, false);
+	spin_unlock_bh(&map_idr_lock);
+
+	return map;
+}
+
 #define BPF_PROG_GET_FD_BY_ID_LAST_FIELD prog_id
 
 struct bpf_prog *bpf_prog_by_id(u32 id)
