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diff --git a/classes/container-common.bbclass b/classes/container-common.bbclass
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+# SPDX-FileCopyrightText: Copyright (C) 2025 Bruce Ashfield
+#
+# SPDX-License-Identifier: MIT
+#
+# container-common.bbclass
+# ===========================================================================
+# Shared functions for container bundling and cross-installation
+# ===========================================================================
+#
+# This class provides common helper functions used by both:
+#   - container-bundle.bbclass
+#   - container-cross-install.bbclass
+#
+# These functions map target architecture to multiconfig names, machine names,
+# and blob directory names used by vdkr/vpdmn.
+
+# Determine multiconfig name for blob building based on target architecture
+# Returns the multiconfig name (e.g., 'vruntime-aarch64' or 'vruntime-x86-64')
+def get_vruntime_multiconfig(d):
+    arch = d.getVar('TARGET_ARCH')
+    if arch == 'aarch64':
+        return 'vruntime-aarch64'
+    elif arch in ['x86_64', 'i686', 'i586']:
+        return 'vruntime-x86-64'
+    else:
+        return None
+
+# Get the MACHINE name used in the multiconfig (for deploy path)
+# Returns the machine name (e.g., 'qemuarm64' or 'qemux86-64')
+def get_vruntime_machine(d):
+    arch = d.getVar('TARGET_ARCH')
+    if arch == 'aarch64':
+        return 'qemuarm64'
+    elif arch in ['x86_64', 'i686', 'i586']:
+        return 'qemux86-64'
+    else:
+        return None
+
+# Map TARGET_ARCH to blob directory name (aarch64, x86_64)
+# The blob directories contain pre-built kernel and initramfs for vdkr/vpdmn
+def get_blob_arch(d):
+    """Map Yocto TARGET_ARCH to blob directory name"""
+    arch = d.getVar('TARGET_ARCH')
+    blob_map = {
+        'aarch64': 'aarch64',
+        'arm': 'aarch64',  # Use aarch64 blobs for 32-bit ARM too
+        'x86_64': 'x86_64',
+        'i686': 'x86_64',
+        'i586': 'x86_64',
+    }
+    return blob_map.get(arch, 'aarch64')