Changeset 73245 in vbox

Timestamp:

Jul 19, 2018 3:18:03 PM (7 years ago)

Author:

vboxsync

Message:

VMM/CPUM: Nested VMX: bugref:9180 Report IA32_FEATURE_CONTROL.VMXON bit.

File:

• trunk/src/VBox/VMM/VMMAll/CPUMAllMsrs.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMAll/CPUMAllMsrs.cpp

@@ -240 +240 @@
 VMM_INT_DECL(uint64_t) CPUMGetGuestIa32FeatureControl(PVMCPU pVCpu)
 {
-    RT_NOREF_PV(pVCpu);
-    return 1; /* Locked, no VT-X, no SYSENTER micromanagement. */
+    /* Always report the MSR lock bit as set, in order to prevent guests from modifiying this MSR. */
+    uint64_t fFeatCtl = MSR_IA32_FEATURE_CONTROL_LOCK;
+
+    /* Report VMX features. */
+    if (pVCpu->CTX_SUFF(pVM)->cpum.s.GuestFeatures.fVmx)
+        fFeatCtl |= MSR_IA32_FEATURE_CONTROL_VMXON;
+
+    return fFeatCtl;
 }