Index: /trunk/src/VBox/VMM/VMMR0/HWACCMR0.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR0/HWACCMR0.cpp	(revision 15987)
+++ /trunk/src/VBox/VMM/VMMR0/HWACCMR0.cpp	(revision 15988)
@@ -541,5 +541,9 @@
             val = ASMRdMsr(MSR_K6_EFER);
             if (val & MSR_K6_EFER_SVME)
+            {
+                /* Restore previous value. */
+                ASMWrMsr(MSR_K6_EFER, val);
                 paRc[idCpu] = VINF_SUCCESS;
+            }
             else
                 paRc[idCpu] = VERR_SVM_ILLEGAL_EFER_MSR;