diff --git a/automotive/vehicle/aidl/Android.bp b/automotive/vehicle/aidl/Android.bp
index 5ca1fc8262..ff0635a7bc 100644
--- a/automotive/vehicle/aidl/Android.bp
+++ b/automotive/vehicle/aidl/Android.bp
@@ -56,5 +56,5 @@ aidl_interface {
         },
 
     ],
-
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/generated_lib/cpp/Android.bp b/automotive/vehicle/aidl/generated_lib/cpp/Android.bp
index 11d3693b50..d14cbc2dcc 100644
--- a/automotive/vehicle/aidl/generated_lib/cpp/Android.bp
+++ b/automotive/vehicle/aidl/generated_lib/cpp/Android.bp
@@ -24,4 +24,5 @@ cc_library_headers {
     local_include_dirs: ["."],
     export_include_dirs: ["."],
     defaults: ["VehicleHalInterfaceDefaults"],
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/Android.bp b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/Android.bp
index 75a3541cdd..d1974ac95f 100644
--- a/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/Android.bp
+++ b/automotive/vehicle/aidl/impl/default_config/JsonConfigLoader/Android.bp
@@ -49,6 +49,7 @@ cc_library {
     ],
     cflags: ["-DENABLE_VEHICLE_HAL_TEST_PROPERTIES"],
     shared_libs: ["libjsoncpp"],
+    host_supported: true,
 }
 
 cc_library_headers {
diff --git a/automotive/vehicle/aidl/impl/fake_impl/GeneratorHub/Android.bp b/automotive/vehicle/aidl/impl/fake_impl/GeneratorHub/Android.bp
index ab223d3f94..a250a4774b 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/GeneratorHub/Android.bp
+++ b/automotive/vehicle/aidl/impl/fake_impl/GeneratorHub/Android.bp
@@ -32,4 +32,5 @@ cc_library {
     shared_libs: [
         "libjsoncpp",
     ],
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/fake_impl/hardware/Android.bp b/automotive/vehicle/aidl/impl/fake_impl/hardware/Android.bp
index e75f6485b8..33b403f7fd 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/Android.bp
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/Android.bp
@@ -32,6 +32,7 @@ cc_library {
         "VehicleHalDefaults",
         "FakeVehicleHardwareDefaults",
     ],
+    host_supported: true,
 }
 
 cc_defaults {
diff --git a/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h b/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h
index d986b419f2..1b6f576b8c 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/include/FakeVehicleHardware.h
@@ -200,7 +200,7 @@ class FakeVehicleHardware : public IVehicleHardware {
             EXCLUDES(mLock);
     // Load the config files in format '*.json' from the directory and parse the config files
     // into a map from property ID to ConfigDeclarations.
-    void loadPropConfigsFromDir(const std::string& dirPath,
+    bool loadPropConfigsFromDir(const std::string& dirPath,
                                 std::unordered_map<int32_t, ConfigDeclaration>* configs);
     // Function to be called when a value change event comes from vehicle bus. In our fake
     // implementation, this function is only called during "--inject-event" dump command.
diff --git a/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp b/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp
index dced62446c..2b20f3806b 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp
+++ b/automotive/vehicle/aidl/impl/fake_impl/hardware/src/FakeVehicleHardware.cpp
@@ -329,7 +329,12 @@ bool FakeVehicleHardware::UseOverrideConfigDir() {
 
 std::unordered_map<int32_t, ConfigDeclaration> FakeVehicleHardware::loadConfigDeclarations() {
     std::unordered_map<int32_t, ConfigDeclaration> configsByPropId;
-    loadPropConfigsFromDir(mDefaultConfigDir, &configsByPropId);
+    bool defaultConfigLoaded = loadPropConfigsFromDir(mDefaultConfigDir, &configsByPropId);
+    if (!defaultConfigLoaded) {
+        // This cannot work without a valid default config.
+        ALOGE("Failed to load default config, exiting");
+        exit(1);
+    }
     if (UseOverrideConfigDir()) {
         loadPropConfigsFromDir(mOverrideConfigDir, &configsByPropId);
     }
@@ -2258,30 +2263,35 @@ void FakeVehicleHardware::onValuesChangeCallback(std::vector<VehiclePropValue> v
     (*mOnPropertyChangeCallback)(std::move(subscribedUpdatedValues));
 }
 
-void FakeVehicleHardware::loadPropConfigsFromDir(
+bool FakeVehicleHardware::loadPropConfigsFromDir(
         const std::string& dirPath,
         std::unordered_map<int32_t, ConfigDeclaration>* configsByPropId) {
     ALOGI("loading properties from %s", dirPath.c_str());
-    if (auto dir = opendir(dirPath.c_str()); dir != NULL) {
-        std::regex regJson(".*[.]json", std::regex::icase);
-        while (auto f = readdir(dir)) {
-            if (!std::regex_match(f->d_name, regJson)) {
-                continue;
-            }
-            std::string filePath = dirPath + "/" + std::string(f->d_name);
-            ALOGI("loading properties from %s", filePath.c_str());
-            auto result = mLoader.loadPropConfig(filePath);
-            if (!result.ok()) {
-                ALOGE("failed to load config file: %s, error: %s", filePath.c_str(),
-                      result.error().message().c_str());
-                continue;
-            }
-            for (auto& [propId, configDeclaration] : result.value()) {
-                (*configsByPropId)[propId] = std::move(configDeclaration);
-            }
-        }
-        closedir(dir);
+    auto dir = opendir(dirPath.c_str());
+    if (dir == nullptr) {
+        ALOGE("Failed to open config directory: %s", dirPath.c_str());
+        return false;
     }
+
+    std::regex regJson(".*[.]json", std::regex::icase);
+    while (auto f = readdir(dir)) {
+        if (!std::regex_match(f->d_name, regJson)) {
+            continue;
+        }
+        std::string filePath = dirPath + "/" + std::string(f->d_name);
+        ALOGI("loading properties from %s", filePath.c_str());
+        auto result = mLoader.loadPropConfig(filePath);
+        if (!result.ok()) {
+            ALOGE("failed to load config file: %s, error: %s", filePath.c_str(),
+                  result.error().message().c_str());
+            continue;
+        }
+        for (auto& [propId, configDeclaration] : result.value()) {
+            (*configsByPropId)[propId] = std::move(configDeclaration);
+        }
+    }
+    closedir(dir);
+    return true;
 }
 
 Result<float> FakeVehicleHardware::safelyParseFloat(int index, const std::string& s) {
diff --git a/automotive/vehicle/aidl/impl/fake_impl/obd2frame/Android.bp b/automotive/vehicle/aidl/impl/fake_impl/obd2frame/Android.bp
index c1cee84e63..8fc7341fb8 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/obd2frame/Android.bp
+++ b/automotive/vehicle/aidl/impl/fake_impl/obd2frame/Android.bp
@@ -29,4 +29,5 @@ cc_library {
         "VehicleHalUtils",
     ],
     export_static_lib_headers: ["VehicleHalUtils"],
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/fake_impl/userhal/Android.bp b/automotive/vehicle/aidl/impl/fake_impl/userhal/Android.bp
index 2e955315cd..181fd10de5 100644
--- a/automotive/vehicle/aidl/impl/fake_impl/userhal/Android.bp
+++ b/automotive/vehicle/aidl/impl/fake_impl/userhal/Android.bp
@@ -29,4 +29,5 @@ cc_library {
         "VehicleHalUtils",
     ],
     export_static_lib_headers: ["VehicleHalUtils"],
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/grpc/Android.bp b/automotive/vehicle/aidl/impl/grpc/Android.bp
index e5106f8da3..fd1d1ca75a 100644
--- a/automotive/vehicle/aidl/impl/grpc/Android.bp
+++ b/automotive/vehicle/aidl/impl/grpc/Android.bp
@@ -127,4 +127,5 @@ cc_library_static {
     cflags: [
         "-Wno-unused-parameter",
     ],
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/grpc/utils/proto_message_converter/Android.bp b/automotive/vehicle/aidl/impl/grpc/utils/proto_message_converter/Android.bp
index 52ef7beefb..d10aa3e67f 100644
--- a/automotive/vehicle/aidl/impl/grpc/utils/proto_message_converter/Android.bp
+++ b/automotive/vehicle/aidl/impl/grpc/utils/proto_message_converter/Android.bp
@@ -39,6 +39,7 @@ cc_library {
     ],
     defaults: ["VehicleHalDefaults"],
     export_static_lib_headers: ["VehicleHalUtils"],
+    host_supported: true,
 }
 
 cc_test {
diff --git a/automotive/vehicle/aidl/impl/hardware/Android.bp b/automotive/vehicle/aidl/impl/hardware/Android.bp
index edb0f29862..52fd5e43df 100644
--- a/automotive/vehicle/aidl/impl/hardware/Android.bp
+++ b/automotive/vehicle/aidl/impl/hardware/Android.bp
@@ -30,4 +30,5 @@ cc_library_headers {
     export_header_lib_headers: [
         "VehicleHalUtilHeaders",
     ],
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/utils/common/Android.bp b/automotive/vehicle/aidl/impl/utils/common/Android.bp
index e5d9346da4..5cd07b4417 100644
--- a/automotive/vehicle/aidl/impl/utils/common/Android.bp
+++ b/automotive/vehicle/aidl/impl/utils/common/Android.bp
@@ -25,10 +25,12 @@ cc_library {
     local_include_dirs: ["include"],
     export_include_dirs: ["include"],
     defaults: ["VehicleHalDefaults"],
+    host_supported: true,
 }
 
 cc_library_headers {
     name: "VehicleHalUtilHeaders",
     export_include_dirs: ["include"],
     vendor: true,
+    host_supported: true,
 }
diff --git a/automotive/vehicle/aidl/impl/utils/common/src/VehiclePropertyStore.cpp b/automotive/vehicle/aidl/impl/utils/common/src/VehiclePropertyStore.cpp
index 6a2a695254..3d0a5240bb 100644
--- a/automotive/vehicle/aidl/impl/utils/common/src/VehiclePropertyStore.cpp
+++ b/automotive/vehicle/aidl/impl/utils/common/src/VehiclePropertyStore.cpp
@@ -173,9 +173,7 @@ VhalResult<void> VehiclePropertyStore::writeValue(VehiclePropValuePool::Recyclab
     }
 
     if (onValuesChangeCallback == nullptr && onValueChangeCallback == nullptr) {
-        ALOGW("No callback registered, ignoring property update for propId: %" PRId32
-              ", area ID: %" PRId32,
-              propId, areaId);
+        // No callback registered.
         return {};
     }
 
diff --git a/automotive/vehicle/aidl_property/Android.bp b/automotive/vehicle/aidl_property/Android.bp
index 5db39d84f7..6a49792cd0 100644
--- a/automotive/vehicle/aidl_property/Android.bp
+++ b/automotive/vehicle/aidl_property/Android.bp
@@ -56,6 +56,7 @@ aidl_interface {
             imports: [],
         },
     ],
+    host_supported: true,
 }
 
 filegroup {