1 files changed, 61 insertions, 0 deletions
diff --git a/src/VBox/VMM/VMMR0/EMR0.cpp b/src/VBox/VMM/VMMR0/EMR0.cpp
new file mode 100644
index 00000000..8cc3b0fb
--- /dev/null
+++ b/src/VBox/VMM/VMMR0/EMR0.cpp
@@ -0,0 +1,61 @@
+/* $Id: EMR0.cpp $ */
+/** @file
+ * EM - Host Context Ring 0.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_EM
+#include <VBox/vmm/em.h>
+#include "EMInternal.h"
+#include <VBox/vmm/vmcc.h>
+#include <VBox/vmm/gvm.h>
+#include <iprt/errcore.h>
+#include <VBox/log.h>
+#include <iprt/assert.h>
+#include <iprt/thread.h>
+
+
+
+/**
+ * Adjusts EM configuration options.
+ *
+ * @returns VBox status code.
+ * @param   pGVM            The ring-0 VM structure.
+ */
+VMMR0_INT_DECL(int) EMR0InitVM(PGVM pGVM)
+{
+    /*
+     * Override ring-0 exit optimizations settings.
+     */
+    PVMCPUCC pVCpu0 = &pGVM->aCpus[0];
+    bool fEnabledR0                = pVCpu0->em.s.fExitOptimizationEnabled
+                                  && pVCpu0->em.s.fExitOptimizationEnabledR0
+                                  && (RTThreadPreemptIsPossible() || RTThreadPreemptIsPendingTrusty());
+    bool fEnabledR0PreemptDisabled = fEnabledR0
+                                  && pVCpu0->em.s.fExitOptimizationEnabledR0PreemptDisabled
+                                  && RTThreadPreemptIsPendingTrusty();
+    for (VMCPUID idCpu = 0; idCpu < pGVM->cCpus; idCpu++)
+    {
+        PVMCPUCC pVCpu = &pGVM->aCpus[idCpu];
+        pVCpu->em.s.fExitOptimizationEnabledR0                = fEnabledR0;
+        pVCpu->em.s.fExitOptimizationEnabledR0PreemptDisabled = fEnabledR0PreemptDisabled;
+    }
+
+    return VINF_SUCCESS;
+}
+