diff --git a/Deprecation.md b/Deprecation.md
index 9378e1a..9e9b22c 100644
--- a/Deprecation.md
+++ b/Deprecation.md
@@ -18,6 +18,7 @@
 | `BUILD_AUX_STATIC_LIBRARY`       | Error     |
 | `BUILD_HOST_FUZZ_TEST`           | Error     |
 | `BUILD_HOST_NATIVE_TEST`         | Error     |
+| `BUILD_HOST_SHARED_LIBRARY`      | Warning   |
 | `BUILD_HOST_SHARED_TEST_LIBRARY` | Error     |
 | `BUILD_HOST_STATIC_LIBRARY`      | Warning   |
 | `BUILD_HOST_STATIC_TEST_LIBRARY` | Error     |
diff --git a/core/board_config.mk b/core/board_config.mk
index b9b4dc2..f5c8ea5 100644
--- a/core/board_config.mk
+++ b/core/board_config.mk
@@ -26,6 +26,7 @@
   BOARD_KERNEL_CMDLINE \
   BOARD_KERNEL_BASE \
   BOARD_USES_GENERIC_AUDIO \
+  BOARD_USES_RECOVERY_AS_BOOT \
   BOARD_VENDOR_USE_AKMD \
   BOARD_WPA_SUPPLICANT_DRIVER \
   BOARD_WLAN_DEVICE \
diff --git a/core/deprecation.mk b/core/deprecation.mk
index 761a9b6..fd71f48 100644
--- a/core/deprecation.mk
+++ b/core/deprecation.mk
@@ -9,7 +9,6 @@
   BUILD_HOST_EXECUTABLE \
   BUILD_HOST_JAVA_LIBRARY \
   BUILD_HOST_PREBUILT \
-  BUILD_HOST_SHARED_LIBRARY \
   BUILD_JAVA_LIBRARY \
   BUILD_MULTI_PREBUILT \
   BUILD_NATIVE_TEST \
@@ -27,6 +26,7 @@
 # relevant BUILD_BROKEN_USES_BUILD_* variables, then these would move to
 # DEFAULT_ERROR_BUILD_MODULE_TYPES.
 DEFAULT_WARNING_BUILD_MODULE_TYPES :=$= \
+  BUILD_HOST_SHARED_LIBRARY \
   BUILD_HOST_STATIC_LIBRARY \
 
 # These are BUILD_* variables that are errors to reference, but you can set
diff --git a/core/shared_library.mk b/core/shared_library.mk
index 2832c17..984f05f 100644
--- a/core/shared_library.mk
+++ b/core/shared_library.mk
@@ -1,4 +1,7 @@
 $(call record-module-type,SHARED_LIBRARY)
+ifdef LOCAL_IS_HOST_MODULE
+  $(call pretty-error,BUILD_SHARED_LIBRARY is incompatible with LOCAL_IS_HOST_MODULE. Use BUILD_HOST_SHARED_LIBRARY instead.)
+endif
 my_prefix := TARGET_
 include $(BUILD_SYSTEM)/multilib.mk
 
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 7c58082..d223792 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -203,6 +203,8 @@
 
 $(call add_json_bool, InstallExtraFlattenedApexes, $(PRODUCT_INSTALL_EXTRA_FLATTENED_APEXES))
 
+$(call add_json_bool, BoardUsesRecoveryAsBoot, $(BOARD_USES_RECOVERY_AS_BOOT))
+
 $(call json_end)
 
 $(file >$(SOONG_VARIABLES).tmp,$(json_contents))
diff --git a/core/static_library.mk b/core/static_library.mk
index 8002e5c..1b056ec 100644
--- a/core/static_library.mk
+++ b/core/static_library.mk
@@ -1,4 +1,7 @@
 $(call record-module-type,STATIC_LIBRARY)
+ifdef LOCAL_IS_HOST_MODULE
+  $(call pretty-error,BUILD_STATIC_LIBRARY is incompatible with LOCAL_IS_HOST_MODULE. Use BUILD_HOST_STATIC_LIBRARY instead)
+endif
 my_prefix := TARGET_
 include $(BUILD_SYSTEM)/multilib.mk
 
diff --git a/target/product/gsi/current.txt b/target/product/gsi/current.txt
index f2415f4..b015c83 100644
--- a/target/product/gsi/current.txt
+++ b/target/product/gsi/current.txt
@@ -236,8 +236,6 @@
 VNDK-core: libhardware_legacy.so
 VNDK-core: libhidlallocatorutils.so
 VNDK-core: libjpeg.so
-VNDK-core: libkeymaster_messages.so
-VNDK-core: libkeymaster_portable.so
 VNDK-core: libldacBT_abr.so
 VNDK-core: libldacBT_enc.so
 VNDK-core: liblz4.so
@@ -253,11 +251,8 @@
 VNDK-core: libpng.so
 VNDK-core: libpower.so
 VNDK-core: libprocinfo.so
-VNDK-core: libprotobuf-cpp-lite-3.9.1.so
-VNDK-core: libpuresoftkeymasterdevice.so
 VNDK-core: libradio_metadata.so
 VNDK-core: libselinux.so
-VNDK-core: libsoftkeymasterdevice.so
 VNDK-core: libspeexresampler.so
 VNDK-core: libsqlite.so
 VNDK-core: libssl.so
diff --git a/target/product/virtual_ab_ota.mk b/target/product/virtual_ab_ota.mk
index c00b0ed..5c398b4 100644
--- a/target/product/virtual_ab_ota.mk
+++ b/target/product/virtual_ab_ota.mk
@@ -17,3 +17,5 @@
 PRODUCT_VIRTUAL_AB_OTA := true
 
 PRODUCT_PRODUCT_PROPERTIES += ro.virtual_ab.enabled=true
+
+PRODUCT_PACKAGES += e2fsck_ramdisk