| 1 | /* $Id: VMMRZ.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VMM - Virtual Machine Monitor, Raw-mode and ring-0 context code.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2009-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_VMM
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| 23 | #include <VBox/vmm/vmm.h>
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| 24 | #include "VMMInternal.h"
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| 25 | #include <VBox/vmm/vmcc.h>
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| 26 |
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| 27 | #include <iprt/assert.h>
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| 28 | #include <iprt/asm-amd64-x86.h>
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| 29 | #include <iprt/errcore.h>
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| 30 | #include <iprt/string.h>
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| 31 |
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| 32 |
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| 33 | /**
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| 34 | * Disables all host calls, except certain fatal ones.
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| 35 | *
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| 36 | * @param pVCpu The cross context virtual CPU structure of the calling EMT.
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| 37 | * @thread EMT.
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| 38 | */
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| 39 | VMMRZDECL(void) VMMRZCallRing3Disable(PVMCPUCC pVCpu)
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| 40 | {
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| 41 | VMCPU_ASSERT_EMT(pVCpu);
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| 42 | #if defined(LOG_ENABLED) && defined(IN_RING0)
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| 43 | RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
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| 44 | #endif
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| 45 |
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| 46 | Assert(pVCpu->vmmr0.s.cCallRing3Disabled < 16);
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| 47 | if (ASMAtomicUoIncU32(&pVCpu->vmmr0.s.cCallRing3Disabled) == 1)
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| 48 | {
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| 49 | #ifdef IN_RC
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| 50 | pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = true;
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| 51 | #else
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| 52 | pVCpu->vmmr0.s.fLogFlushingDisabled = true;
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| 53 | #endif
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| 54 | }
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| 55 |
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| 56 | #if defined(LOG_ENABLED) && defined(IN_RING0)
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| 57 | ASMSetFlags(fFlags);
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| 58 | #endif
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| 59 | }
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| 60 |
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| 61 |
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| 62 | /**
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| 63 | * Counters VMMRZCallRing3Disable() and re-enables host calls.
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| 64 | *
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| 65 | * @param pVCpu The cross context virtual CPU structure of the calling EMT.
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| 66 | * @thread EMT.
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| 67 | */
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| 68 | VMMRZDECL(void) VMMRZCallRing3Enable(PVMCPUCC pVCpu)
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| 69 | {
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| 70 | VMCPU_ASSERT_EMT(pVCpu);
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| 71 | #if defined(LOG_ENABLED) && defined(IN_RING0)
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| 72 | RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
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| 73 | #endif
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| 74 |
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| 75 | Assert(pVCpu->vmmr0.s.cCallRing3Disabled > 0);
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| 76 | if (ASMAtomicUoDecU32(&pVCpu->vmmr0.s.cCallRing3Disabled) == 0)
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| 77 | {
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| 78 | #ifdef IN_RC
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| 79 | pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = false;
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| 80 | #else
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| 81 | pVCpu->vmmr0.s.fLogFlushingDisabled = false;
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| 82 | #endif
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| 83 | }
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| 84 |
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| 85 | #if defined(LOG_ENABLED) && defined(IN_RING0)
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| 86 | ASMSetFlags(fFlags);
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| 87 | #endif
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| 88 | }
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| 89 |
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| 90 |
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| 91 | /**
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| 92 | * Checks whether its possible to call host context or not.
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| 93 | *
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| 94 | * @returns true if it's safe, false if it isn't.
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| 95 | * @param pVCpu The cross context virtual CPU structure of the calling EMT.
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| 96 | */
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| 97 | VMMRZDECL(bool) VMMRZCallRing3IsEnabled(PVMCPUCC pVCpu)
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| 98 | {
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| 99 | VMCPU_ASSERT_EMT(pVCpu);
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| 100 | Assert(pVCpu->vmmr0.s.cCallRing3Disabled <= 16);
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| 101 | return pVCpu->vmmr0.s.cCallRing3Disabled == 0;
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| 102 | }
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| 103 |
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