Changeset 107931 in vbox for trunk/src/VBox/VMM/VMMR3

Timestamp:

Jan 24, 2025 10:00:36 AM (4 weeks ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

167166

Message:

VMM/NEM-win: Only export & import IA32_SPEC_CTRL if the host supports it and we're exposing the register to the guest. (AMD regression from r167064.) jiraref:VBP-947 bugref:10738

File:

• trunk/src/VBox/VMM/VMMR3/NEMR3Native-win.cpp (modified) (1 diff)

trunk/src/VBox/VMM/VMMR3/NEMR3Native-win.cpp

@@ -1539 +1539 @@
     AssertReturn(!pVM->nem.s.fCreatedEmts, VERR_WRONG_ORDER);
     AssertReturn(pVM->bMainExecutionEngine == VM_EXEC_ENGINE_NATIVE_API, VERR_WRONG_ORDER);
+
+    /*
+     * Determine whether we can and should export/import IA32_SPEC_CTRL.
+     */
+    pVM->nem.s.fDoIa32SpecCtrl = pVM->nem.s.fSpeculationControl
+                              && g_CpumHostFeatures.s.fSpecCtrlMsr
+                              && pVM->cpum.ro.GuestFeatures.fSpecCtrlMsr;
 
     /*