| 1 | /* $Id: EMR0.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * EM - Host Context Ring 0.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_EM
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| 33 | #include <VBox/vmm/em.h>
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| 34 | #include "EMInternal.h"
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| 35 | #include <VBox/vmm/vmcc.h>
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| 36 | #include <VBox/vmm/gvm.h>
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| 37 | #include <iprt/errcore.h>
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| 38 | #include <VBox/log.h>
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| 39 | #include <iprt/assert.h>
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| 40 | #include <iprt/thread.h>
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| 41 |
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| 42 |
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| 43 |
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| 44 | /**
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| 45 | * Adjusts EM configuration options.
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| 46 | *
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| 47 | * @returns VBox status code.
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| 48 | * @param pGVM The ring-0 VM structure.
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| 49 | */
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| 50 | VMMR0_INT_DECL(int) EMR0InitVM(PGVM pGVM)
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| 51 | {
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| 52 | /*
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| 53 | * Override ring-0 exit optimizations settings.
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| 54 | */
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| 55 | PVMCPUCC pVCpu0 = &pGVM->aCpus[0];
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| 56 | bool fEnabledR0 = pVCpu0->em.s.fExitOptimizationEnabled
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| 57 | && pVCpu0->em.s.fExitOptimizationEnabledR0
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| 58 | && (RTThreadPreemptIsPossible() || RTThreadPreemptIsPendingTrusty());
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| 59 | bool fEnabledR0PreemptDisabled = fEnabledR0
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| 60 | && pVCpu0->em.s.fExitOptimizationEnabledR0PreemptDisabled
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| 61 | && RTThreadPreemptIsPendingTrusty();
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| 62 | for (VMCPUID idCpu = 0; idCpu < pGVM->cCpus; idCpu++)
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| 63 | {
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| 64 | PVMCPUCC pVCpu = &pGVM->aCpus[idCpu];
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| 65 | pVCpu->em.s.fExitOptimizationEnabledR0 = fEnabledR0;
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| 66 | pVCpu->em.s.fExitOptimizationEnabledR0PreemptDisabled = fEnabledR0PreemptDisabled;
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| 67 | }
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| 68 |
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| 69 | return VINF_SUCCESS;
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| 70 | }
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| 71 |
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