diff --git a/transport/ServiceManagement.cpp b/transport/ServiceManagement.cpp
index 357bb30..f35abdc 100644
--- a/transport/ServiceManagement.cpp
+++ b/transport/ServiceManagement.cpp
@@ -559,6 +559,18 @@
     return manager;
 }
 
+std::vector<std::string> getAllHalInstanceNames(const std::string& descriptor) {
+    std::vector<std::string> ret;
+    auto sm = defaultServiceManager1_2();
+    sm->listManifestByInterface(descriptor, [&](const auto& instances) {
+        ret.reserve(instances.size());
+        for (const auto& i : instances) {
+            ret.push_back(i);
+        }
+    });
+    return ret;
+}
+
 namespace details {
 
 void preloadPassthroughService(const std::string &descriptor) {
diff --git a/transport/include/hidl/ServiceManagement.h b/transport/include/hidl/ServiceManagement.h
index a962034..4573a25 100644
--- a/transport/include/hidl/ServiceManagement.h
+++ b/transport/include/hidl/ServiceManagement.h
@@ -18,6 +18,7 @@
 #define ANDROID_HARDWARE_ISERVICE_MANAGER_H
 
 #include <string>
+#include <vector>
 
 #include <android/hidl/base/1.0/IBase.h>
 #include <utils/StrongPointer.h>
@@ -71,6 +72,14 @@
 sp<::android::hidl::manager::V1_1::IServiceManager> getPassthroughServiceManager1_1();
 
 /**
+ * Given a descriptor (e.g. from IFoo::descriptor), return a list of all instance names
+ * on a device (e.g. the VINTF manifest). These HALs may not be currently running, but
+ * the expectation is that if they aren't running, they should start as lazy HALs.
+ * So, getService should return for each of these instance names.
+ */
+std::vector<std::string> getAllHalInstanceNames(const std::string& descriptor);
+
+/**
  * Given a service that is in passthrough mode, this function will go ahead and load the
  * required passthrough module library (but not call HIDL_FETCH_I* functions to instantiate it).
  *