diff --git a/java/bootclasspath_fragment.go b/java/bootclasspath_fragment.go
index f6c62b1..358c72b 100644
--- a/java/bootclasspath_fragment.go
+++ b/java/bootclasspath_fragment.go
@@ -679,7 +679,16 @@
 
 	// Build a profile for the image config and then use that to build the boot image.
 	profile := bootImageProfileRule(ctx, imageConfig)
-	return buildBootImage(ctx, imageConfig, profile)
+
+	// Build boot image files for the host variants.
+	buildBootImageVariantsForBuildOs(ctx, imageConfig, profile)
+
+	// Build boot image files for the android variants.
+	androidBootImageFilesByArch := buildBootImageVariantsForAndroidOs(ctx, imageConfig, profile)
+
+	// Return the boot image files for the android variants for inclusion in an APEX and to be zipped
+	// up for the dist.
+	return androidBootImageFilesByArch
 }
 
 type bootclasspathFragmentMemberType struct {
@@ -935,6 +944,12 @@
 		}
 	}
 
+	// Build the boot image files for the host variants. These are built from the dex files provided
+	// by the contents of this module as prebuilt versions of the host boot image files are not
+	// available, i.e. there is no host specific prebuilt apex containing them. This has to be built
+	// without a profile as the prebuilt modules do not provide a profile.
+	buildBootImageVariantsForBuildOs(ctx, imageConfig, nil)
+
 	return files
 }
 
diff --git a/java/dexpreopt_bootjars.go b/java/dexpreopt_bootjars.go
index 0f8ff9e..19c65ca 100644
--- a/java/dexpreopt_bootjars.go
+++ b/java/dexpreopt_bootjars.go
@@ -502,14 +502,36 @@
 	}
 }
 
-// buildBootImage takes a bootImageConfig, and creates rules to build it.
+// buildBootImageVariantsForAndroidOs generates rules to build the boot image variants for the
+// android.Android OsType and returns a map from the architectures to the paths of the generated
+// boot image files.
+//
+// The paths are returned because they are needed elsewhere in Soong, e.g. for populating an APEX.
+func buildBootImageVariantsForAndroidOs(ctx android.ModuleContext, image *bootImageConfig, profile android.WritablePath) bootImageFilesByArch {
+	return buildBootImageForOsType(ctx, image, profile, android.Android)
+}
+
+// buildBootImageVariantsForBuildOs generates rules to build the boot image variants for the
+// android.BuildOs OsType, i.e. the type of OS on which the build is being running.
+//
+// The files need to be generated into their predefined location because they are used from there
+// both within Soong and outside, e.g. for ART based host side testing and also for use by some
+// cloud based tools. However, they are not needed by callers of this function and so the paths do
+// not need to be returned from this func, unlike the buildBootImageVariantsForAndroidOs func.
+func buildBootImageVariantsForBuildOs(ctx android.ModuleContext, image *bootImageConfig, profile android.WritablePath) {
+	buildBootImageForOsType(ctx, image, profile, android.BuildOs)
+}
+
+// buildBootImageForOsType takes a bootImageConfig, a profile file and an android.OsType
+// boot image files are required for and it creates rules to build the boot image
+// files for all the required architectures for them.
 //
 // It returns a map from android.ArchType to the predefined paths of the boot image files.
-func buildBootImage(ctx android.ModuleContext, image *bootImageConfig, profile android.WritablePath) bootImageFilesByArch {
+func buildBootImageForOsType(ctx android.ModuleContext, image *bootImageConfig, profile android.WritablePath, requiredOsType android.OsType) bootImageFilesByArch {
 	filesByArch := bootImageFilesByArch{}
 	for _, variant := range image.variants {
-		buildBootImageVariant(ctx, variant, profile)
-		if variant.target.Os == android.Android {
+		if variant.target.Os == requiredOsType {
+			buildBootImageVariant(ctx, variant, profile)
 			filesByArch[variant.target.Arch.ArchType] = variant.imagesDeps.Paths()
 		}
 	}
diff --git a/java/platform_bootclasspath.go b/java/platform_bootclasspath.go
index cb92922..10739b0 100644
--- a/java/platform_bootclasspath.go
+++ b/java/platform_bootclasspath.go
@@ -421,10 +421,15 @@
 
 	// Build a profile for the image config and then use that to build the boot image.
 	profile := bootImageProfileRule(ctx, imageConfig)
-	bootImageFilesByArch := buildBootImage(ctx, imageConfig, profile)
 
-	// Zip the boot image files up.
-	buildBootImageZipInPredefinedLocation(ctx, imageConfig, bootImageFilesByArch)
+	// Build boot image files for the android variants.
+	androidBootImageFilesByArch := buildBootImageVariantsForAndroidOs(ctx, imageConfig, profile)
+
+	// Zip the android variant boot image files up.
+	buildBootImageZipInPredefinedLocation(ctx, imageConfig, androidBootImageFilesByArch)
+
+	// Build boot image files for the host variants. There are use directly by ART host side tests.
+	buildBootImageVariantsForBuildOs(ctx, imageConfig, profile)
 
 	dumpOatRules(ctx, imageConfig)
 }