Index: /trunk/include/VBox/vmm/pdmdev.h
===================================================================
--- /trunk/include/VBox/vmm/pdmdev.h	(revision 92526)
+++ /trunk/include/VBox/vmm/pdmdev.h	(revision 92527)
@@ -2425,5 +2425,5 @@
 
 /** Current PDMDEVHLPR3 version number. */
-#define PDM_DEVHLPR3_VERSION                    PDM_VERSION_MAKE_PP(0xffe7, 62, 0)
+#define PDM_DEVHLPR3_VERSION                    PDM_VERSION_MAKE_PP(0xffe7, 63, 0)
 
 /**
@@ -4790,4 +4790,12 @@
 
     /**
+     * Gets the main execution engine for the VM.
+     *
+     * @returns VM_EXEC_ENGINE_XXX
+     * @param   pDevIns             The device instance.
+     */
+    DECLR3CALLBACKMEMBER(uint8_t, pfnGetMainExecutionEngine,(PPDMDEVINS pDevIns));
+
+    /**
      * Get the current virtual clock time in a VM. The clock frequency must be
      * queried separately.
@@ -5280,4 +5288,12 @@
 
     /**
+     * Gets the main execution engine for the VM.
+     *
+     * @returns VM_EXEC_ENGINE_XXX
+     * @param   pDevIns             The device instance.
+     */
+    DECLRCCALLBACKMEMBER(uint8_t, pfnGetMainExecutionEngine,(PPDMDEVINS pDevIns));
+
+    /**
      * Get the current virtual clock time in a VM. The clock frequency must be
      * queried separately.
@@ -5476,5 +5492,5 @@
 
 /** Current PDMDEVHLP version number. */
-#define PDM_DEVHLPRC_VERSION                    PDM_VERSION_MAKE(0xffe6, 18, 0)
+#define PDM_DEVHLPRC_VERSION                    PDM_VERSION_MAKE(0xffe6, 19, 0)
 
 
@@ -5688,4 +5704,12 @@
      */
     DECLR0CALLBACKMEMBER(VMCPUID, pfnGetCurrentCpuId,(PPDMDEVINS pDevIns));
+
+    /**
+     * Gets the main execution engine for the VM.
+     *
+     * @returns VM_EXEC_ENGINE_XXX
+     * @param   pDevIns             The device instance.
+     */
+    DECLR0CALLBACKMEMBER(uint8_t, pfnGetMainExecutionEngine,(PPDMDEVINS pDevIns));
 
     /** @name Timer handle method wrappers
@@ -6037,5 +6061,5 @@
 
 /** Current PDMDEVHLP version number. */
-#define PDM_DEVHLPR0_VERSION                    PDM_VERSION_MAKE(0xffe5, 25, 0)
+#define PDM_DEVHLPR0_VERSION                    PDM_VERSION_MAKE(0xffe5, 26, 0)
 
 
@@ -9399,5 +9423,4 @@
 
 #ifdef IN_RING3
-
 /**
  * @copydoc PDMDEVHLPR3::pfnGetCpuId
@@ -9407,4 +9430,15 @@
     pDevIns->pHlpR3->pfnGetCpuId(pDevIns, iLeaf, pEax, pEbx, pEcx, pEdx);
 }
+#endif
+
+/**
+ * @copydoc PDMDEVHLPR3::pfnGetMainExecutionEngine
+ */
+DECLINLINE(uint8_t) PDMDevHlpGetMainExecutionEngine(PPDMDEVINS pDevIns)
+{
+    return pDevIns->CTX_SUFF(pHlp)->pfnGetMainExecutionEngine(pDevIns);
+}
+
+#ifdef IN_RING3
 
 /**
Index: /trunk/src/VBox/VMM/VMMR0/PDMR0DevHlp.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR0/PDMR0DevHlp.cpp	(revision 92526)
+++ /trunk/src/VBox/VMM/VMMR0/PDMR0DevHlp.cpp	(revision 92527)
@@ -368,5 +368,5 @@
 
 
-/** @interface_method_impl{PDMDEVHLPRC,pfnGetCurrentCpuId} */
+/** @interface_method_impl{PDMDEVHLPR0,pfnGetCurrentCpuId} */
 static DECLCALLBACK(VMCPUID) pdmR0DevHlp_GetCurrentCpuId(PPDMDEVINS pDevIns)
 {
@@ -375,4 +375,13 @@
     LogFlow(("pdmR0DevHlp_GetCurrentCpuId: caller='%p'/%d for CPU %u\n", pDevIns, pDevIns->iInstance, idCpu));
     return idCpu;
+}
+
+
+/** @interface_method_impl{PDMDEVHLPR0,pfnGetMainExecutionEngine} */
+static DECLCALLBACK(uint8_t) pdmR0DevHlp_GetMainExecutionEngine(PPDMDEVINS pDevIns)
+{
+    PDMDEV_ASSERT_DEVINS(pDevIns);
+    LogFlow(("pdmR0DevHlp_GetMainExecutionEngine: caller='%s'/%d:\n", pDevIns->pReg->szName, pDevIns->iInstance));
+    return pDevIns->Internal.s.pGVM->bMainExecutionEngine;
 }
 
@@ -1400,4 +1409,5 @@
     pdmR0DevHlp_GetVMCPU,
     pdmR0DevHlp_GetCurrentCpuId,
+    pdmR0DevHlp_GetMainExecutionEngine,
     pdmR0DevHlp_TimerFromMicro,
     pdmR0DevHlp_TimerFromMilli,
@@ -1511,4 +1521,5 @@
     pdmR0DevHlp_GetVMCPU,
     pdmR0DevHlp_GetCurrentCpuId,
+    pdmR0DevHlp_GetMainExecutionEngine,
     pdmR0DevHlp_TimerFromMicro,
     pdmR0DevHlp_TimerFromMilli,
Index: /trunk/src/VBox/VMM/VMMR3/PDMDevHlp.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/PDMDevHlp.cpp	(revision 92526)
+++ /trunk/src/VBox/VMM/VMMR3/PDMDevHlp.cpp	(revision 92527)
@@ -4632,4 +4632,14 @@
     LogFlow(("pdmR3DevHlp_GetCpuId: caller='%s'/%d: returns void - *pEax=%#x *pEbx=%#x *pEcx=%#x *pEdx=%#x\n",
              pDevIns->pReg->szName, pDevIns->iInstance, *pEax, *pEbx, *pEcx, *pEdx));
+}
+
+
+/** @interface_method_impl{PDMDEVHLPR3,pfnGetMainExecutionEngine} */
+static DECLCALLBACK(uint8_t) pdmR3DevHlp_GetMainExecutionEngine(PPDMDEVINS pDevIns)
+{
+    PDMDEV_ASSERT_DEVINS(pDevIns);
+    VM_ASSERT_EMT(pDevIns->Internal.s.pVMR3);
+    LogFlow(("pdmR3DevHlp_GetMainExecutionEngine: caller='%s'/%d:\n", pDevIns->pReg->szName, pDevIns->iInstance));
+    return pDevIns->Internal.s.pVMR3->bMainExecutionEngine;
 }
 
@@ -5179,4 +5189,5 @@
     pdmR3DevHlp_A20Set,
     pdmR3DevHlp_GetCpuId,
+    pdmR3DevHlp_GetMainExecutionEngine,
     pdmR3DevHlp_TMTimeVirtGet,
     pdmR3DevHlp_TMTimeVirtGetFreq,
@@ -5575,4 +5586,5 @@
     pdmR3DevHlp_A20Set,
     pdmR3DevHlp_GetCpuId,
+    pdmR3DevHlp_GetMainExecutionEngine,
     pdmR3DevHlp_TMTimeVirtGet,
     pdmR3DevHlp_TMTimeVirtGetFreq,
@@ -5721,4 +5733,13 @@
     NOREF(iLeaf); NOREF(pEax); NOREF(pEbx); NOREF(pEcx); NOREF(pEdx);
     AssertReleaseMsgFailed(("Untrusted device called trusted helper! '%s'/%d\n", pDevIns->pReg->szName, pDevIns->iInstance));
+}
+
+
+/** @interface_method_impl{PDMDEVHLPR3,pfnGetMainExecutionEngine} */
+static DECLCALLBACK(uint8_t) pdmR3DevHlp_Untrusted_GetMainExecutionEngine(PPDMDEVINS pDevIns)
+{
+    PDMDEV_ASSERT_DEVINS(pDevIns);
+    AssertReleaseMsgFailed(("Untrusted device called trusted helper! '%s'/%d\n", pDevIns->pReg->szName, pDevIns->iInstance));
+    return VM_EXEC_ENGINE_NOT_SET;
 }
 
@@ -6285,4 +6306,5 @@
     pdmR3DevHlp_Untrusted_A20Set,
     pdmR3DevHlp_Untrusted_GetCpuId,
+    pdmR3DevHlp_Untrusted_GetMainExecutionEngine,
     pdmR3DevHlp_TMTimeVirtGet,
     pdmR3DevHlp_TMTimeVirtGetFreq,