Index: /trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp	(revision 56659)
+++ /trunk/src/VBox/VMM/VMMAll/IOMAllMMIO.cpp	(revision 56660)
@@ -1662,5 +1662,5 @@
 
 /**
- * \#PF Handler callback for MMIO ranges.
+ * Common worker for the \#PF handler and IOMMMIOPhysHandler (APIC+VT-x).
  *
  * @returns VBox status code (appropriate for GC return).
@@ -1673,5 +1673,6 @@
  * @param   pvUser      Pointer to the MMIO ring-3 range entry.
  */
-static VBOXSTRICTRC iomMMIOHandler(PVM pVM, PVMCPU pVCpu, uint32_t uErrorCode, PCPUMCTXCORE pCtxCore, RTGCPHYS GCPhysFault, void *pvUser)
+static VBOXSTRICTRC iomMmioCommonPfHandler(PVM pVM, PVMCPU pVCpu, uint32_t uErrorCode, PCPUMCTXCORE pCtxCore,
+                                           RTGCPHYS GCPhysFault, void *pvUser)
 {
     int rc = IOM_LOCK_SHARED(pVM);
@@ -1683,5 +1684,5 @@
 
     STAM_PROFILE_START(&pVM->iom.s.StatRZMMIOHandler, a);
-    Log(("iomMMIOHandler: GCPhys=%RGp uErr=%#x rip=%RGv\n", GCPhysFault, uErrorCode, (RTGCPTR)pCtxCore->rip));
+    Log(("iomMmioCommonPfHandler: GCPhys=%RGp uErr=%#x rip=%RGv\n", GCPhysFault, uErrorCode, (RTGCPTR)pCtxCore->rip));
 
     PIOMMMIORANGE pRange = (PIOMMMIORANGE)pvUser;
@@ -1759,4 +1760,12 @@
     PDMCritSectLeave(pDevIns->CTX_SUFF(pCritSectRo));
     iomMmioReleaseRange(pVM, pRange);
+    if (RT_SUCCESS(rcStrict))
+        return rcStrict;
+    if (   rcStrict == VERR_IEM_ASPECT_NOT_IMPLEMENTED
+        || rcStrict == VERR_IEM_INSTR_NOT_IMPLEMENTED)
+    {
+        Log(("IOM: Hit unsupported IEM feature!\n"));
+        rcStrict = VINF_EM_RAW_EMULATE_INSTR;
+    }
     return rcStrict;
 
@@ -1923,5 +1932,5 @@
     LogFlow(("iomMmioPfHandler: GCPhys=%RGp uErr=%#x pvFault=%RGv rip=%RGv\n",
              GCPhysFault, (uint32_t)uErrorCode, pvFault, (RTGCPTR)pCtxCore->rip));
-    return iomMMIOHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pvUser);
+    return iomMmioCommonPfHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pvUser);
 }
 
@@ -1956,5 +1965,5 @@
     IOM_UNLOCK_SHARED(pVM);
 
-    VBOXSTRICTRC rcStrict = iomMMIOHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pRange);
+    VBOXSTRICTRC rcStrict = iomMmioCommonPfHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pRange);
 
     iomMmioReleaseRange(pVM, pRange);