--- a/config/Config-images.in.orig	2019-05-28 14:40:45.246749741 +0200
+++ b/config/Config-images.in	2019-05-28 14:41:14.866378695 +0200
@@ -251,6 +251,13 @@
 		select TARGET_IMAGES_PAD
 		select PACKAGE_kmod-e1000
 
+	config VHDX_IMAGES
+		bool "Build Hyper-V image files (VHDX)"
+		depends on TARGET_x86
+		select GRUB_IMAGES
+		select TARGET_IMAGES_PAD
+		select PACKAGE_kmod-e1000
+
 	config TARGET_IMAGES_PAD
 		bool "Pad images to filesystem size (for JFFS2)"
 		depends on GRUB_IMAGES
--- a/target/linux/x86/image/Makefile.orig	2019-06-03 14:32:39.094356089 +0200
+++ b/target/linux/x86/image/Makefile	2019-06-03 19:04:23.875965073 +0200
@@ -143,6 +143,15 @@
   endef
 endif
 
+ifneq ($(CONFIG_VHDX_IMAGES),)
+    define Image/Build/vhdx
+	rm $(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).vhdx || true
+	qemu-img convert -f raw -O vhdx \
+		$(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).img \
+		$(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).vhdx
+  endef
+endif
+
 define Image/Build/gzip
 	gzip -f9n $(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).img
 	gzip -f9n $(BIN_DIR)/$(IMG_PREFIX)-rootfs-$(1).img
@@ -175,6 +184,7 @@
 	$(call Image/Build/grub2,$(1))
 	$(call Image/Build/vdi,$(1))
 	$(call Image/Build/vmdk,$(1))
+	$(call Image/Build/vhdx,$(1))
 	$(CP) $(KDIR)/root.$(1) $(BIN_DIR)/$(IMG_PREFIX)-rootfs-$(1).img
   else
 	$(CP) $(KDIR)/root.iso $(BIN_DIR)/$(IMG_PREFIX).iso