Changeset 19712 in vbox

Timestamp:

May 15, 2009 7:59:32 AM (16 years ago)

Author:

vboxsync

Message:

Can't properly emulate monitor & mwait with guest SMP; force the guest to use hlt for idling VCPUs.

File:

• trunk/src/VBox/VMM/CPUM.cpp (modified) (2 diffs)

trunk/src/VBox/VMM/CPUM.cpp

@@ -318 +318 @@
     pCPUM->aGuestCpuIdStd[1].ecx      &= 0
                                        | X86_CPUID_FEATURE_ECX_SSE3
-                                       | X86_CPUID_FEATURE_ECX_MONITOR
                                        //| X86_CPUID_FEATURE_ECX_CPLDS - no CPL qualified debug store.
                                        //| X86_CPUID_FEATURE_ECX_VMX   - not virtualized.
@@ -333 +332 @@
                                        //| X86_CPUID_FEATURE_ECX_POPCOUNT
                                        | 0;
+
+    /* Can't properly emulate monitor & mwait with guest SMP; force the guest to use hlt for idling VCPUs. */
+    if (pVM->cCPUs == 1)
+        pCPUM->aGuestCpuIdStd[1].ecx |= X86_CPUID_FEATURE_ECX_MONITOR;
 
     /* ASSUMES that this is ALWAYS the AMD define feature set if present. */