Index: /trunk/src/VBox/VMM/VMMR3/GIMKvm.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/GIMKvm.cpp	(revision 55653)
+++ /trunk/src/VBox/VMM/VMMR3/GIMKvm.cpp	(revision 55654)
@@ -516,5 +516,7 @@
  * alternative is to use an MMIO2 region and use the WallClock.u32Version field
  * for transactional update. However, this MSR is rarely written to (typically
- * once during bootup) it's currently not a performance issue.
+ * once during bootup) it's currently not a performance issue especially since
+ * we're already in ring-3. If we really wanted better performance in this code
+ * path, we should be doing it in ring-0.
  *
  * @returns VBox status code.