| 1 | /* $Id: TMAllCpu.cpp 20689 2009-06-18 12:13:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * TM - Timeout Manager, CPU Time, All Contexts.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 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 | #define LOG_GROUP LOG_GROUP_TM
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| 27 | #include <VBox/tm.h>
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| 28 | #include "../TMInternal.h"
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| 29 | #include <VBox/vm.h>
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| 30 | #include <VBox/sup.h>
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| 31 |
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| 32 | #include <VBox/param.h>
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| 33 | #include <VBox/err.h>
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| 34 | #include <iprt/assert.h>
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| 35 | #include <iprt/asm.h>
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| 36 | #include <VBox/log.h>
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| 37 |
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| 38 |
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| 39 | /**
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| 40 | * Gets the raw cpu tick from current virtual time.
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| 41 | */
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| 42 | DECLINLINE(uint64_t) tmCpuTickGetRawVirtual(PVM pVM, bool fCheckTimers)
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| 43 | {
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| 44 | uint64_t u64 = TMVirtualSyncGetEx(pVM, fCheckTimers);
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| 45 | if (u64 != TMCLOCK_FREQ_VIRTUAL)
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| 46 | u64 = ASMMultU64ByU32DivByU32(u64, pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL);
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| 47 | return u64;
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| 48 | }
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| 49 |
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| 50 |
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| 51 | /**
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| 52 | * Resumes the CPU timestamp counter ticking.
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| 53 | *
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| 54 | * @returns VBox status code.
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| 55 | * @param pVM The VM to operate on.
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| 56 | * @param pVCpu The VMCPU to operate on.
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| 57 | * @internal
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| 58 | */
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| 59 | int tmCpuTickResume(PVM pVM, PVMCPU pVCpu)
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| 60 | {
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| 61 | if (!pVCpu->tm.s.fTSCTicking)
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| 62 | {
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| 63 | pVCpu->tm.s.fTSCTicking = true;
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| 64 | if (pVM->tm.s.fTSCVirtualized)
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| 65 | {
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| 66 | /** @todo Test that pausing and resuming doesn't cause lag! (I.e. that we're
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| 67 | * unpaused before the virtual time and stopped after it. */
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| 68 | if (pVM->tm.s.fTSCUseRealTSC)
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| 69 | pVCpu->tm.s.offTSCRawSrc = ASMReadTSC() - pVCpu->tm.s.u64TSC;
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| 70 | else
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| 71 | pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
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| 72 | - pVCpu->tm.s.u64TSC;
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| 73 | }
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| 74 | return VINF_SUCCESS;
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| 75 | }
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| 76 | AssertFailed();
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| 77 | return VERR_INTERNAL_ERROR;
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| 78 | }
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| 79 |
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| 80 |
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| 81 | /**
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| 82 | * Pauses the CPU timestamp counter ticking.
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| 83 | *
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| 84 | * @returns VBox status code.
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| 85 | * @param pVM The VM to operate on.
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| 86 | * @param pVCpu The VMCPU to operate on.
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| 87 | * @internal
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| 88 | */
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| 89 | int tmCpuTickPause(PVM pVM, PVMCPU pVCpu)
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| 90 | {
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| 91 | if (pVCpu->tm.s.fTSCTicking)
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| 92 | {
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| 93 | pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
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| 94 | pVCpu->tm.s.fTSCTicking = false;
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| 95 | return VINF_SUCCESS;
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| 96 | }
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| 97 | AssertFailed();
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| 98 | return VERR_INTERNAL_ERROR;
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| 99 | }
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Checks if AMD-V / VT-x can use an offsetted hardware TSC or not.
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| 104 | *
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| 105 | * @returns true/false accordingly.
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| 106 | * @param pVCpu The VMCPU to operate on.
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| 107 | * @param poffRealTSC The offset against the TSC of the current CPU.
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| 108 | * Can be NULL.
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| 109 | * @thread EMT.
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| 110 | */
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| 111 | VMMDECL(bool) TMCpuTickCanUseRealTSC(PVMCPU pVCpu, uint64_t *poffRealTSC)
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| 112 | {
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| 113 | PVM pVM = pVCpu->CTX_SUFF(pVM);
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| 114 |
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| 115 | /*
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| 116 | * We require:
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| 117 | * 1. A fixed TSC, this is checked at init time.
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| 118 | * 2. That the TSC is ticking (we shouldn't be here if it isn't)
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| 119 | * 3. Either that we're using the real TSC as time source or
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| 120 | * a) we don't have any lag to catch up, and
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| 121 | * b) the virtual sync clock hasn't been halted by an expired timer, and
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| 122 | * c) we're not using warp drive (accelerated virtual guest time).
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| 123 | */
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| 124 | if ( pVM->tm.s.fMaybeUseOffsettedHostTSC
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| 125 | && RT_LIKELY(pVCpu->tm.s.fTSCTicking)
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| 126 | && ( pVM->tm.s.fTSCUseRealTSC
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| 127 | || ( !pVM->tm.s.fVirtualSyncCatchUp
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| 128 | && RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
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| 129 | && !pVM->tm.s.fVirtualWarpDrive))
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| 130 | )
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| 131 | {
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| 132 | if (!pVM->tm.s.fTSCUseRealTSC)
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| 133 | {
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| 134 | /* The source is the timer synchronous virtual clock. */
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| 135 | Assert(pVM->tm.s.fTSCVirtualized);
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| 136 |
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| 137 | if (poffRealTSC)
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| 138 | {
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| 139 | uint64_t u64Now = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
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| 140 | - pVCpu->tm.s.offTSCRawSrc;
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| 141 | /** @todo When we start collecting statistics on how much time we spend executing
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| 142 | * guest code before exiting, we should check this against the next virtual sync
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| 143 | * timer timeout. If it's lower than the avg. length, we should trap rdtsc to increase
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| 144 | * the chance that we'll get interrupted right after the timer expired. */
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| 145 | *poffRealTSC = u64Now - ASMReadTSC();
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| 146 | }
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| 147 | }
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| 148 | else if (poffRealTSC)
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| 149 | {
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| 150 | /* The source is the real TSC. */
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| 151 | if (pVM->tm.s.fTSCVirtualized)
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| 152 | *poffRealTSC = pVCpu->tm.s.offTSCRawSrc;
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| 153 | else
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| 154 | *poffRealTSC = 0;
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| 155 | }
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| 156 | /** @todo count this? */
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| 157 | return true;
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| 158 | }
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| 159 |
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| 160 | #ifdef VBOX_WITH_STATISTICS
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| 161 | /* Sample the reason for refusing. */
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| 162 | if (!pVM->tm.s.fMaybeUseOffsettedHostTSC)
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| 163 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotFixed);
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| 164 | else if (!pVCpu->tm.s.fTSCTicking)
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| 165 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotTicking);
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| 166 | else if (!pVM->tm.s.fTSCUseRealTSC)
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| 167 | {
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| 168 | if (pVM->tm.s.fVirtualSyncCatchUp)
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| 169 | {
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| 170 | if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 10)
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| 171 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE010);
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| 172 | else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 25)
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| 173 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE025);
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| 174 | else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 100)
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| 175 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE100);
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| 176 | else
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| 177 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupOther);
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| 178 | }
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| 179 | else if (!pVM->tm.s.fVirtualSyncTicking)
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| 180 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCSyncNotTicking);
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| 181 | else if (pVM->tm.s.fVirtualWarpDrive)
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| 182 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCWarp);
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| 183 | }
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| 184 | #endif
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| 185 | return false;
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| 186 | }
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| 187 |
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| 188 |
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| 189 | /**
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| 190 | * Read the current CPU timstamp counter.
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| 191 | *
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| 192 | * @returns Gets the CPU tsc.
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| 193 | * @param pVCpu The VMCPU to operate on.
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| 194 | */
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| 195 | DECLINLINE(uint64_t) tmCpuTickGetInternal(PVMCPU pVCpu, bool fCheckTimers)
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| 196 | {
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| 197 | uint64_t u64;
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| 198 |
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| 199 | if (RT_LIKELY(pVCpu->tm.s.fTSCTicking))
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| 200 | {
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| 201 | PVM pVM = pVCpu->CTX_SUFF(pVM);
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| 202 | if (pVM->tm.s.fTSCVirtualized)
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| 203 | {
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| 204 | if (pVM->tm.s.fTSCUseRealTSC)
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| 205 | u64 = ASMReadTSC();
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| 206 | else
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| 207 | u64 = tmCpuTickGetRawVirtual(pVM, fCheckTimers);
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| 208 | u64 -= pVCpu->tm.s.offTSCRawSrc;
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| 209 | }
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| 210 | else
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| 211 | u64 = ASMReadTSC();
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| 212 | }
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| 213 | else
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| 214 | u64 = pVCpu->tm.s.u64TSC;
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| 215 | return u64;
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| 216 | }
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| 217 |
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| 218 |
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| 219 | /**
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| 220 | * Read the current CPU timstamp counter.
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| 221 | *
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| 222 | * @returns Gets the CPU tsc.
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| 223 | * @param pVCpu The VMCPU to operate on.
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| 224 | */
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| 225 | VMMDECL(uint64_t) TMCpuTickGet(PVMCPU pVCpu)
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| 226 | {
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| 227 | return tmCpuTickGetInternal(pVCpu, true /* fCheckTimers */);
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| 228 | }
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| 229 |
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| 230 |
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| 231 | /**
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| 232 | * Read the current CPU timstamp counter, don't check for expired timers.
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| 233 | *
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| 234 | * @returns Gets the CPU tsc.
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| 235 | * @param pVCpu The VMCPU to operate on.
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| 236 | */
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| 237 | VMMDECL(uint64_t) TMCpuTickGetNoCheck(PVMCPU pVCpu)
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| 238 | {
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| 239 | return tmCpuTickGetInternal(pVCpu, false /* fCheckTimers */);
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| 240 | }
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| 241 |
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| 242 |
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| 243 | /**
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| 244 | * Sets the current CPU timestamp counter.
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| 245 | *
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| 246 | * @returns VBox status code.
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| 247 | * @param pVM The VM handle.
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| 248 | * @param pVCpu The virtual CPU to operate on.
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| 249 | * @param u64Tick The new timestamp value.
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| 250 | *
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| 251 | * @thread EMT which TSC is to be set.
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| 252 | */
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| 253 | VMMDECL(int) TMCpuTickSet(PVM pVM, PVMCPU pVCpu, uint64_t u64Tick)
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| 254 | {
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| 255 | VMCPU_ASSERT_EMT(pVCpu);
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| 256 | STAM_COUNTER_INC(&pVM->tm.s.StatTSCSet);
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| 257 |
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| 258 | /*
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| 259 | * This is easier to do when the TSC is paused since resume will
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| 260 | * do all the calcuations for us. Actually, we don't need to
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| 261 | * call tmCpuTickPause here since we overwrite u64TSC anyway.
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| 262 | */
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| 263 | bool fTSCTicking = pVCpu->tm.s.fTSCTicking;
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| 264 | pVCpu->tm.s.fTSCTicking = false;
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| 265 | pVCpu->tm.s.u64TSC = u64Tick;
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| 266 | if (fTSCTicking)
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| 267 | tmCpuTickResume(pVM, pVCpu);
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| 268 | /** @todo Try help synchronizing it better among the virtual CPUs? */
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| 269 |
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| 270 | return VINF_SUCCESS;
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| 271 | }
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| 272 |
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| 273 |
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| 274 | /**
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| 275 | * Get the timestamp frequency.
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| 276 | *
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| 277 | * @returns Number of ticks per second.
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| 278 | * @param pVM The VM.
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| 279 | */
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| 280 | VMMDECL(uint64_t) TMCpuTicksPerSecond(PVM pVM)
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| 281 | {
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| 282 | if (pVM->tm.s.fTSCUseRealTSC)
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| 283 | {
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| 284 | uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage);
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| 285 | if (RT_LIKELY(cTSCTicksPerSecond != ~(uint64_t)0))
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| 286 | return cTSCTicksPerSecond;
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| 287 | }
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| 288 | return pVM->tm.s.cTSCTicksPerSecond;
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| 289 | }
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| 290 |
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