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/* $Id: EMR0.cpp $ */
/** @file
* EM - Host Context Ring 0.
*/
/*
* Copyright (C) 2006-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* 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;
}
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