| 1 | /* $Id: VMMRZ.cpp 25760 2010-01-12 13:07:21Z 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 Sun Microsystems, Inc.
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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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 18 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 19 | * additional information or have any questions.
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| 20 | */
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| 21 |
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| 22 |
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| 23 | /*******************************************************************************
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| 24 | * Header Files *
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| 25 | *******************************************************************************/
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| 26 | #include <VBox/vmm.h>
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| 27 | #include "VMMInternal.h"
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| 28 | #include <VBox/vm.h>
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| 29 | #include <VBox/err.h>
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| 30 |
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| 31 | #include <iprt/assert.h>
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| 32 | #include <iprt/string.h>
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| 33 |
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| 34 |
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| 35 | /**
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| 36 | * Calls the ring-3 host code.
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| 37 | *
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| 38 | * @returns VBox status code of the ring-3 call.
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| 39 | * @retval VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
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| 40 | * be passed up the stack, or if that isn't possible then VMMRZCallRing3
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| 41 | * needs to change it into an assertion.
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| 42 | *
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| 43 | *
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| 44 | * @param pVM The VM handle.
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| 45 | * @param pVCpu The virtual CPU handle of the calling EMT.
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| 46 | * @param enmOperation The operation.
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| 47 | * @param uArg The argument to the operation.
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| 48 | */
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| 49 | VMMRZDECL(int) VMMRZCallRing3(PVM pVM, PVMCPU pVCpu, VMMCALLRING3 enmOperation, uint64_t uArg)
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| 50 | {
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| 51 | VMCPU_ASSERT_EMT(pVCpu);
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| 52 |
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| 53 | /*
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| 54 | * Check if calling ring-3 has been disabled and only let let fatal calls thru.
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| 55 | */
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| 56 | if (RT_UNLIKELY( pVCpu->vmm.s.cCallRing3Disabled != 0
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| 57 | && enmOperation != VMMCALLRING3_VM_R0_ASSERTION))
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| 58 | {
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| 59 | /*
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| 60 | * In most cases, it's sufficient to return a status code which
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| 61 | * will then be propagated up the code usually encountering several
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| 62 | * AssertRC invocations along the way. Hitting one of those is more
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| 63 | * helpful than stopping here.
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| 64 | *
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| 65 | * However, some doesn't check the status code because they are called
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| 66 | * from void functions, and for these we'll turn this into a ring-0
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| 67 | * assertion host call.
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| 68 | */
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| 69 | if (enmOperation != VMMCALLRING3_REM_REPLAY_HANDLER_NOTIFICATIONS)
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| 70 | return VERR_VMM_RING3_CALL_DISABLED;
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| 71 | #ifdef IN_RC
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| 72 | RTStrPrintf(g_szRTAssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
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| 73 | "VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x\n", enmOperation, uArg, pVCpu->idCpu);
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| 74 | #endif
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| 75 | RTStrPrintf(pVM->vmm.s.szRing0AssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
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| 76 | "VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x\n", enmOperation, uArg, pVCpu->idCpu);
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| 77 | enmOperation = VMMCALLRING3_VM_R0_ASSERTION;
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| 78 | }
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| 79 |
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| 80 | /*
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| 81 | * The normal path.
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| 82 | */
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| 83 | /** @todo profile this! */
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| 84 | pVCpu->vmm.s.enmCallRing3Operation = enmOperation;
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| 85 | pVCpu->vmm.s.u64CallRing3Arg = uArg;
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| 86 | pVCpu->vmm.s.rcCallRing3 = VERR_INTERNAL_ERROR;
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| 87 | #ifdef IN_RC
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| 88 | pVM->vmm.s.pfnGuestToHostRC(VINF_VMM_CALL_HOST);
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| 89 | #else
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| 90 | int rc = vmmR0CallRing3LongJmp(&pVCpu->vmm.s.CallRing3JmpBufR0, VINF_VMM_CALL_HOST);
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| 91 | if (RT_FAILURE(rc))
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| 92 | return rc;
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| 93 | #endif
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| 94 | return pVCpu->vmm.s.rcCallRing3;
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| 95 | }
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| 96 |
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| 97 |
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| 98 | /**
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| 99 | * Simple wrapper that adds the pVCpu argument.
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| 100 | *
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| 101 | * @returns VBox status code of the ring-3 call.
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| 102 | * @retval VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
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| 103 | * be passed up the stack, or if that isn't possible then VMMRZCallRing3
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| 104 | * needs to change it into an assertion.
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| 105 | *
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| 106 | * @param pVM The VM handle.
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| 107 | * @param enmOperation The operation.
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| 108 | * @param uArg The argument to the operation.
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| 109 | */
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| 110 | VMMRZDECL(int) VMMRZCallRing3NoCpu(PVM pVM, VMMCALLRING3 enmOperation, uint64_t uArg)
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| 111 | {
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| 112 | return VMMRZCallRing3(pVM, VMMGetCpu(pVM), enmOperation, uArg);
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| 113 | }
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| 114 |
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| 115 |
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| 116 | /**
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| 117 | * Disables all host calls, except certain fatal ones.
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| 118 | *
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| 119 | * @param pVCpu The CPU struct for the calling EMT.
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| 120 | * @thread EMT.
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| 121 | */
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| 122 | VMMRZDECL(void) VMMRZCallRing3Disable(PVMCPU pVCpu)
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| 123 | {
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| 124 | VMCPU_ASSERT_EMT(pVCpu);
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| 125 | Assert(pVCpu->vmm.s.cCallRing3Disabled < 16);
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| 126 | if (++pVCpu->vmm.s.cCallRing3Disabled == 1)
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| 127 | {
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| 128 | /** @todo it might make more sense to just disable logging here, then we
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| 129 | * won't flush away important bits... but that goes both ways really. */
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| 130 | #ifdef IN_RC
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| 131 | pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = true;
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| 132 | #else
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| 133 | # ifdef LOG_ENABLED
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| 134 | if (pVCpu->vmm.s.pR0LoggerR0)
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| 135 | pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = true;
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| 136 | # endif
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| 137 | #endif
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| 138 | }
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| 139 | }
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| 140 |
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| 141 |
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| 142 | /**
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| 143 | * Counters VMMRZCallRing3Disable and re-enables host calls.
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| 144 | *
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| 145 | * @param pVCpu The CPU struct for the calling EMT.
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| 146 | * @thread EMT.
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| 147 | */
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| 148 | VMMRZDECL(void) VMMRZCallRing3Enable(PVMCPU pVCpu)
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| 149 | {
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| 150 | VMCPU_ASSERT_EMT(pVCpu);
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| 151 | Assert(pVCpu->vmm.s.cCallRing3Disabled > 0);
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| 152 | if (--pVCpu->vmm.s.cCallRing3Disabled == 0)
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| 153 | {
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| 154 | #ifdef IN_RC
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| 155 | pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = false;
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| 156 | #else
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| 157 | # ifdef LOG_ENABLED
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| 158 | if (pVCpu->vmm.s.pR0LoggerR0)
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| 159 | pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = false;
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| 160 | # endif
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| 161 | #endif
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| 162 | }
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| 163 | }
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| 164 |
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| 165 |
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| 166 | /**
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| 167 | * Checks whether its possible to call host context or not.
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| 168 | *
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| 169 | * @returns true if it's safe, false if it isn't.
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| 170 | * @param pVCpu The CPU struct for the calling EMT.
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| 171 | */
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| 172 | VMMRZDECL(bool) VMMRZCallRing3IsEnabled(PVMCPU pVCpu)
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| 173 | {
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| 174 | VMCPU_ASSERT_EMT(pVCpu);
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| 175 | Assert(pVCpu->vmm.s.cCallRing3Disabled <= 16);
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| 176 | return pVCpu->vmm.s.cCallRing3Disabled == 0;
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| 177 | }
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| 178 |
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