Index: /trunk/include/VBox/vmm/cfgm.h
===================================================================
--- /trunk/include/VBox/vmm/cfgm.h	(revision 53436)
+++ /trunk/include/VBox/vmm/cfgm.h	(revision 53437)
@@ -134,4 +134,5 @@
 VMMR3DECL(int)          CFGMR3CopyTree(PCFGMNODE pDstTree, PCFGMNODE pSrcTree, uint32_t fFlags);
 
+VMMR3DECL(bool)         CFGMR3Exists(           PCFGMNODE pNode, const char *pszName);
 VMMR3DECL(int)          CFGMR3QueryType(        PCFGMNODE pNode, const char *pszName, PCFGMVALUETYPE penmType);
 VMMR3DECL(int)          CFGMR3QuerySize(        PCFGMNODE pNode, const char *pszName, size_t *pcb);
Index: /trunk/src/VBox/VMM/VMMR3/CFGM.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/CFGM.cpp	(revision 53436)
+++ /trunk/src/VBox/VMM/VMMR3/CFGM.cpp	(revision 53437)
@@ -610,4 +610,18 @@
 }
 
+
+/**
+ * Checks if the given value exists.
+ *
+ * @returns true if it exists, false if not.
+ * @param   pNode           Which node to search for pszName in.
+ * @param   pszName         The name of the value we seek.
+ */
+VMMR3DECL(bool) CFGMR3Exists(PCFGMNODE pNode, const char *pszName)
+{
+    PCFGMLEAF pLeaf;
+    int rc = cfgmR3ResolveLeaf(pNode, pszName, &pLeaf);
+    return RT_SUCCESS_NP(rc);
+}