VMMRZ.cpp revision df7a725e1ff9b896a343d168d1949feee1948f86
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * VMM - Virtual Machine Monitor, Raw-mode and ring-0 context code.
c7814cf6e1240a519cbec0441e033d0e2470ed00vboxsync * Copyright (C) 2009-2012 Oracle Corporation
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * available from http://www.virtualbox.org. This file is free software;
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * you can redistribute it and/or modify it under the terms of the GNU
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * General Public License (GPL) as published by the Free Software
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync/*******************************************************************************
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync* Header Files *
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync*******************************************************************************/
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * Calls the ring-3 host code.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @returns VBox status code of the ring-3 call.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @retval VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * be passed up the stack, or if that isn't possible then VMMRZCallRing3
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * needs to change it into an assertion.
4bfa7b58e362a1bca0628643c352c137900bf01avboxsync * @param pVM Pointer to the VM.
63a23b6d96aca4c8545d3c3e89cc454af7ba3da6vboxsync * @param pVCpu Pointer to the VMCPU of the calling EMT.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param enmOperation The operation.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param uArg The argument to the operation.
ebe097ee2ebebb775a1e816af91b4ea67c52b0bdvboxsyncVMMRZDECL(int) VMMRZCallRing3(PVM pVM, PVMCPU pVCpu, VMMCALLRING3 enmOperation, uint64_t uArg)
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * Check if calling ring-3 has been disabled and only let let fatal calls thru.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync if (RT_UNLIKELY( pVCpu->vmm.s.cCallRing3Disabled != 0
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * In most cases, it's sufficient to return a status code which
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * will then be propagated up the code usually encountering several
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * AssertRC invocations along the way. Hitting one of those is more
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * helpful than stopping here.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * However, some doesn't check the status code because they are called
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * from void functions, and for these we'll turn this into a ring-0
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * assertion host call.
ebe097ee2ebebb775a1e816af91b4ea67c52b0bdvboxsync if (enmOperation != VMMCALLRING3_REM_REPLAY_HANDLER_NOTIFICATIONS)
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync RTStrPrintf(g_szRTAssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
ebe097ee2ebebb775a1e816af91b4ea67c52b0bdvboxsync "VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x\n", enmOperation, uArg, pVCpu->idCpu);
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync RTStrPrintf(pVM->vmm.s.szRing0AssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
ebe097ee2ebebb775a1e816af91b4ea67c52b0bdvboxsync "VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x\n", enmOperation, uArg, pVCpu->idCpu);
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * The normal path.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync/** @todo profile this! */
683371bbf37760161d1b8454ce978acf89bbb04fvboxsync pVCpu->vmm.s.rcCallRing3 = VERR_VMM_RING3_CALL_NO_RC;
aed81459e71ba16e05b7155dc0ef77e644951807vboxsync rc = pVCpu->vmm.s.pfnCallRing3CallbackR0(pVCpu, enmOperation, pVCpu->vmm.s.pvCallRing3CallbackUserR0);
aed81459e71ba16e05b7155dc0ef77e644951807vboxsync rc = vmmR0CallRing3LongJmp(&pVCpu->vmm.s.CallRing3JmpBufR0, VINF_VMM_CALL_HOST);
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * Simple wrapper that adds the pVCpu argument.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @returns VBox status code of the ring-3 call.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @retval VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * be passed up the stack, or if that isn't possible then VMMRZCallRing3
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * needs to change it into an assertion.
4bfa7b58e362a1bca0628643c352c137900bf01avboxsync * @param pVM Pointer to the VM.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param enmOperation The operation.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param uArg The argument to the operation.
ebe097ee2ebebb775a1e816af91b4ea67c52b0bdvboxsyncVMMRZDECL(int) VMMRZCallRing3NoCpu(PVM pVM, VMMCALLRING3 enmOperation, uint64_t uArg)
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync return VMMRZCallRing3(pVM, VMMGetCpu(pVM), enmOperation, uArg);
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * Disables all host calls, except certain fatal ones.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param pVCpu The CPU struct for the calling EMT.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @thread EMT.
e14391f78ef5b4888eab64068347691a4c290cd8vboxsync RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
df7a725e1ff9b896a343d168d1949feee1948f86vboxsync if (ASMAtomicUoIncU32(&pVCpu->vmm.s.cCallRing3Disabled) == 1)
97935332ee43e27b4b0448a9fab59374e4ed148avboxsync /** @todo it might make more sense to just disable logging here, then we
97935332ee43e27b4b0448a9fab59374e4ed148avboxsync * won't flush away important bits... but that goes both ways really. */
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = true;
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = true;
df7a725e1ff9b896a343d168d1949feee1948f86vboxsync * Counters VMMRZCallRing3Disable() and re-enables host calls.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param pVCpu The CPU struct for the calling EMT.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @thread EMT.
e14391f78ef5b4888eab64068347691a4c290cd8vboxsync RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
df7a725e1ff9b896a343d168d1949feee1948f86vboxsync if (ASMAtomicUoDecU32(&pVCpu->vmm.s.cCallRing3Disabled) == 0)
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = false;
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = false;
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * Checks whether its possible to call host context or not.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @returns true if it's safe, false if it isn't.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsync * @param pVCpu The CPU struct for the calling EMT.
18e02d8d60d50fb098bbf009186f36bfb430a780vboxsyncVMMRZDECL(bool) VMMRZCallRing3IsEnabled(PVMCPU pVCpu)
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * Sets the ring-0 callback before doing the ring-3 call.
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * @param pVCpu Pointer to the VMCPU.
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * @param pfnCallback Pointer to the callback.
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * @param pvUser The user argument.
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * @return VBox status code.
89f5aff9eff63826c9b171cc7fdb9dc1513fa09dvboxsyncVMMRZDECL(int) VMMRZCallRing3SetNotification(PVMCPU pVCpu, R0PTRTYPE(PFNVMMR0CALLRING3NOTIFICATION) pfnCallback, RTR0PTR pvUser)
cef50e790f9736746cf2da0ed538cac4ee9888a1vboxsync AssertPtrReturn(pfnCallback, VERR_INVALID_POINTER);
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * Removes the ring-0 callback.
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsync * @param pVCpu Pointer to the VMCPU.
c618f4d0eeea6061ff8270e8f7023a999bd0bb91vboxsyncVMMRZDECL(void) VMMRZCallRing3RemoveNotification(PVMCPU pVCpu)
6a553ebb57b0b277305d2b7f4c7e734c203ed83cvboxsync * Checks whether there is a ring-0 callback notification active.
6a553ebb57b0b277305d2b7f4c7e734c203ed83cvboxsync * @param pVCpu Pointer to the VMCPU.
6a553ebb57b0b277305d2b7f4c7e734c203ed83cvboxsync * @returns true if there the notification is active, false otherwise.
6a553ebb57b0b277305d2b7f4c7e734c203ed83cvboxsyncVMMRZDECL(bool) VMMRZCallRing3IsNotificationSet(PVMCPU pVCpu)