Index: /trunk/include/VBox/x86.h
===================================================================
--- /trunk/include/VBox/x86.h	(revision 27394)
+++ /trunk/include/VBox/x86.h	(revision 27395)
@@ -827,4 +827,10 @@
 /** BIOS update signature (microcode). */
 #define MSR_IA32_BIOS_SIGN_ID               0x8B
+
+/** General performance counters. */
+#define MSR_IA32_PMC0                       0xC1
+#define MSR_IA32_PMC1                       0xC2
+#define MSR_IA32_PMC2                       0xC3
+#define MSR_IA32_PMC3                       0xC4
 
 /** Nehalem power control. */