Index: /trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp	(revision 79803)
+++ /trunk/src/VBox/VMM/VMMR3/CPUMR3CpuId.cpp	(revision 79804)
@@ -4752,4 +4752,5 @@
             pVM->cpum.s.aGuestCpuIdPatmExt[1].uEdx = pLeaf->uEdx |= X86_CPUID_EXT_FEATURE_EDX_LONG_MODE;
             pVM->cpum.s.GuestFeatures.fLongMode = 1;
+            pVM->cpum.s.GuestFeatures.cVmxMaxPhysAddrWidth = pVM->cpum.s.GuestFeatures.cMaxPhysAddrWidth;
             LogRel(("CPUM: SetGuestCpuIdFeature: Enabled LONG MODE\n"));
             break;
@@ -5071,4 +5072,5 @@
                 pVM->cpum.s.aGuestCpuIdPatmExt[1].uEdx = pLeaf->uEdx &= ~X86_CPUID_EXT_FEATURE_EDX_LONG_MODE;
             pVM->cpum.s.GuestFeatures.fLongMode = 0;
+            pVM->cpum.s.GuestFeatures.cVmxMaxPhysAddrWidth = 32;
             break;