Index: /trunk/include/VBox/vmm/iem.h
===================================================================
--- /trunk/include/VBox/vmm/iem.h	(revision 74860)
+++ /trunk/include/VBox/vmm/iem.h	(revision 74861)
@@ -222,4 +222,9 @@
 
 #ifdef VBOX_WITH_NESTED_HWVIRT_SVM
+# define IEM_CPUMCTX_EXTRN_VMX_VMEXIT_MASK         CPUMCTX_EXTRN_ABSOLUTELY_ALL
+# define IEM_CPUMCTX_EXTRN_VMX_VMENTRY_MASK        IEM_CPUMCTX_EXTRN_VMX_VMEXIT_MASK
+#endif
+
+#ifdef VBOX_WITH_NESTED_HWVIRT_SVM
 /** The CPUMCTX_EXTRN_XXX mask needed when calling IEMExecSvmVmexit().
  * IEM will ASSUME the caller has ensured these are already present. */
@@ -324,4 +329,5 @@
 #ifdef VBOX_WITH_NESTED_HWVIRT_VMX
 VMM_INT_DECL(VBOXSTRICTRC)  IEMExecVmxVmexitExtInt(PVMCPU pVCpu, uint8_t uVector, bool fIntPending);
+VMM_INT_DECL(VBOXSTRICTRC)  IEMExecVmxVmexitIntWindow(PVMCPU pVCpu);
 VMM_INT_DECL(VBOXSTRICTRC)  IEMExecDecodedVmread(PVMCPU pVCpu, PCVMXVEXITINFO pExitInfo);
 VMM_INT_DECL(VBOXSTRICTRC)  IEMExecDecodedVmwrite(PVMCPU pVCpu, PCVMXVEXITINFO pExitInfo);
Index: /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp	(revision 74860)
+++ /trunk/src/VBox/VMM/VMMAll/IEMAll.cpp	(revision 74861)
@@ -979,4 +979,5 @@
 IEM_STATIC VBOXSTRICTRC     iemVmxVmexitTripleFault(PVMCPU pVCpu);
 IEM_STATIC VBOXSTRICTRC     iemVmxVmexitExtInt(PVMCPU pVCpu, uint8_t uVector, bool fIntPending);
+IEM_STATIC VBOXSTRICTRC     iemVmxVmexitIntWindow(PVMCPU pVCpu);
 #endif
 
@@ -15650,5 +15651,5 @@
 VMM_INT_DECL(VBOXSTRICTRC) IEMExecVmxVmexitExtInt(PVMCPU pVCpu, uint8_t uVector, bool fIntPending)
 {
-    /* IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_SVM_VMEXIT_MASK); */ /** @todo NSTVMX: VMX_EXIT_MASK */
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_VMX_VMEXIT_MASK);
     VBOXSTRICTRC rcStrict = iemVmxVmexitExtInt(pVCpu, uVector, fIntPending);
     if (pVCpu->iem.s.cActiveMappings)
@@ -15659,4 +15660,24 @@
 
 /**
+ * Interface for HM and EM to emulate VM-exits for interrupt-windows.
+ *
+ * @returns Strict VBox status code.
+ * @param   pVCpu           The cross context virtual CPU structure of the calling EMT.
+ * @param   uExitReason     The VM-exit reason.
+ * @param   uExitQual       The VM-exit qualification.
+ *
+ * @thread  EMT(pVCpu)
+ */
+VMM_INT_DECL(VBOXSTRICTRC) IEMExecVmxVmexitIntWindow(PVMCPU pVCpu)
+{
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_VMX_VMEXIT_MASK);
+    VBOXSTRICTRC rcStrict = iemVmxVmexitIntWindow(pVCpu);
+    if (pVCpu->iem.s.cActiveMappings)
+        iemMemRollback(pVCpu);
+    return iemExecStatusCodeFiddling(pVCpu, rcStrict);
+}
+
+
+/**
  * Interface for HM and EM to emulate the VMREAD instruction.
  *
@@ -15669,5 +15690,5 @@
 {
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(pExitInfo->cbInstr, 3);
-    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HWVIRT);
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_EXEC_DECODED_MEM_MASK | CPUMCTX_EXTRN_HM_VMX_MASK);
     Assert(pExitInfo);
 
@@ -15714,5 +15735,5 @@
 {
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(pExitInfo->cbInstr, 3);
-    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HWVIRT);
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_EXEC_DECODED_MEM_MASK | CPUMCTX_EXTRN_HM_VMX_MASK);
     Assert(pExitInfo);
 
@@ -15755,5 +15776,5 @@
     Assert(pExitInfo);
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(pExitInfo->cbInstr, 3);
-    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HWVIRT);
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_EXEC_DECODED_MEM_MASK | CPUMCTX_EXTRN_HM_VMX_MASK);
 
     iemInitExec(pVCpu, false /*fBypassHandlers*/);
@@ -15781,5 +15802,5 @@
     Assert(pExitInfo);
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(pExitInfo->cbInstr, 3);
-    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HWVIRT);
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_EXEC_DECODED_MEM_MASK | CPUMCTX_EXTRN_HM_VMX_MASK);
 
     iemInitExec(pVCpu, false /*fBypassHandlers*/);
@@ -15807,5 +15828,5 @@
     Assert(pExitInfo);
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(pExitInfo->cbInstr, 3);
-    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HWVIRT);
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_EXEC_DECODED_MEM_MASK | CPUMCTX_EXTRN_HM_VMX_MASK);
 
     iemInitExec(pVCpu, false /*fBypassHandlers*/);
@@ -15833,5 +15854,5 @@
     Assert(pExitInfo);
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(pExitInfo->cbInstr, 3);
-    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HWVIRT);
+    IEM_CTX_ASSERT(pVCpu, IEM_CPUMCTX_EXTRN_EXEC_DECODED_MEM_MASK | CPUMCTX_EXTRN_HM_VMX_MASK);
 
     iemInitExec(pVCpu, false /*fBypassHandlers*/);
@@ -15858,4 +15879,5 @@
 {
     IEMEXEC_ASSERT_INSTR_LEN_RETURN(cbInstr, 3);
+    IEM_CTX_ASSERT(pVCpu, CPUMCTX_EXTRN_HM_VMX_MASK);
 
     iemInitExec(pVCpu, false /*fBypassHandlers*/);
Index: /trunk/src/VBox/VMM/VMMAll/IEMAllCImplVmxInstr.cpp.h
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/IEMAllCImplVmxInstr.cpp.h	(revision 74860)
+++ /trunk/src/VBox/VMM/VMMAll/IEMAllCImplVmxInstr.cpp.h	(revision 74861)
@@ -3734,4 +3734,17 @@
 
 /**
+ * VMX VM-exit handler for interrupt-window VM-exits.
+ *
+ * @returns VBox strict status code.
+ * @param   pVCpu           The cross context virtual CPU structure.
+ */
+IEM_STATIC VBOXSTRICTRC iemVmxVmexitIntWindow(PVMCPU pVCpu)
+{
+    iemVmxVmcsSetExitQual(pVCpu, 0);
+    return iemVmxVmexit(pVCpu, VMX_EXIT_INT_WINDOW);
+}
+
+
+/**
  * VMX VM-exit handler for VM-exits due to delivery of an event.
  *