diff --git a/poky/meta/lib/oe/packagedata.py b/poky/meta/lib/oe/packagedata.py
index 0b17897..02c81e5 100644
--- a/poky/meta/lib/oe/packagedata.py
+++ b/poky/meta/lib/oe/packagedata.py
@@ -57,6 +57,18 @@
         ret[newvar] = subd[var]
     return ret
 
+def read_subpkgdata_extended(pkg, d):
+    import json
+    import bb.compress.zstd
+
+    fn = d.expand("${PKGDATA_DIR}/extended/%s.json.zstd" % pkg)
+    try:
+        num_threads = int(d.getVar("BB_NUMBER_THREADS"))
+        with bb.compress.zstd.open(fn, "rt", encoding="utf-8", num_threads=num_threads) as f:
+            return json.load(f)
+    except FileNotFoundError:
+        return None
+
 def _pkgmap(d):
     """Return a dictionary mapping package to recipe name."""