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/* $Id: VMMRZ.cpp $ */
/** @file
* VMM - Virtual Machine Monitor, Raw-mode and ring-0 context code.
*/
/*
* Copyright (C) 2009-2020 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_VMM
#include <VBox/vmm/vmm.h>
#include "VMMInternal.h"
#include <VBox/vmm/vmcc.h>
#include <VBox/err.h>
#include <iprt/assert.h>
#include <iprt/asm-amd64-x86.h>
#include <iprt/string.h>
/**
* Calls the ring-3 host code.
*
* @returns VBox status code of the ring-3 call.
* @retval VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
* be passed up the stack, or if that isn't possible then VMMRZCallRing3
* needs to change it into an assertion.
*
*
* @param pVM The cross context VM structure.
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
* @param enmOperation The operation.
* @param uArg The argument to the operation.
*/
VMMRZDECL(int) VMMRZCallRing3(PVMCC pVM, PVMCPUCC pVCpu, VMMCALLRING3 enmOperation, uint64_t uArg)
{
VMCPU_ASSERT_EMT(pVCpu);
/*
* Check if calling ring-3 has been disabled and only let let fatal calls thru.
*/
if (RT_UNLIKELY( pVCpu->vmm.s.cCallRing3Disabled != 0
&& enmOperation != VMMCALLRING3_VM_R0_ASSERTION))
{
#ifndef IN_RING0
/*
* In most cases, it's sufficient to return a status code which
* will then be propagated up the code usually encountering several
* AssertRC invocations along the way. Hitting one of those is more
* helpful than stopping here.
*
* However, some doesn't check the status code because they are called
* from void functions, and for these we'll turn this into a ring-0
* assertion host call.
*/
if (enmOperation != VMMCALLRING3_REM_REPLAY_HANDLER_NOTIFICATIONS)
return VERR_VMM_RING3_CALL_DISABLED;
#endif
#ifdef IN_RC
RTStrPrintf(g_szRTAssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
"VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x cCallRing3Disabled=%#x\n",
enmOperation, uArg, pVCpu->idCpu, pVCpu->vmm.s.cCallRing3Disabled);
#endif
RTStrPrintf(pVM->vmm.s.szRing0AssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
"VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x cCallRing3Disabled=%#x\n",
enmOperation, uArg, pVCpu->idCpu, pVCpu->vmm.s.cCallRing3Disabled);
enmOperation = VMMCALLRING3_VM_R0_ASSERTION;
}
/*
* The normal path.
*/
/** @todo profile this! */
pVCpu->vmm.s.enmCallRing3Operation = enmOperation;
pVCpu->vmm.s.u64CallRing3Arg = uArg;
pVCpu->vmm.s.rcCallRing3 = VERR_VMM_RING3_CALL_NO_RC;
#ifdef IN_RC
pVM->vmm.s.pfnRCToHost(VINF_VMM_CALL_HOST);
#else
int rc;
if (pVCpu->vmm.s.pfnCallRing3CallbackR0)
{
rc = pVCpu->vmm.s.pfnCallRing3CallbackR0(pVCpu, enmOperation, pVCpu->vmm.s.pvCallRing3CallbackUserR0);
if (RT_FAILURE(rc))
return rc;
}
rc = vmmR0CallRing3LongJmp(&pVCpu->vmm.s.CallRing3JmpBufR0, VINF_VMM_CALL_HOST);
if (RT_FAILURE(rc))
return rc;
#endif
return pVCpu->vmm.s.rcCallRing3;
}
/**
* Simple wrapper that adds the pVCpu argument.
*
* @returns VBox status code of the ring-3 call.
* @retval VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
* be passed up the stack, or if that isn't possible then VMMRZCallRing3
* needs to change it into an assertion.
*
* @param pVM The cross context VM structure.
* @param enmOperation The operation.
* @param uArg The argument to the operation.
*/
VMMRZDECL(int) VMMRZCallRing3NoCpu(PVMCC pVM, VMMCALLRING3 enmOperation, uint64_t uArg)
{
return VMMRZCallRing3(pVM, VMMGetCpu(pVM), enmOperation, uArg);
}
/**
* Disables all host calls, except certain fatal ones.
*
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
* @thread EMT.
*/
VMMRZDECL(void) VMMRZCallRing3Disable(PVMCPUCC pVCpu)
{
VMCPU_ASSERT_EMT(pVCpu);
#if defined(LOG_ENABLED) && defined(IN_RING0)
RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
#endif
Assert(pVCpu->vmm.s.cCallRing3Disabled < 16);
if (ASMAtomicUoIncU32(&pVCpu->vmm.s.cCallRing3Disabled) == 1)
{
/** @todo it might make more sense to just disable logging here, then we
* won't flush away important bits... but that goes both ways really. */
#ifdef IN_RC
pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = true;
#else
# ifdef LOG_ENABLED
if (pVCpu->vmm.s.pR0LoggerR0)
pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = true;
# endif
if (pVCpu->vmm.s.pR0RelLoggerR0)
pVCpu->vmm.s.pR0RelLoggerR0->fFlushingDisabled = true;
#endif
}
#if defined(LOG_ENABLED) && defined(IN_RING0)
ASMSetFlags(fFlags);
#endif
}
/**
* Counters VMMRZCallRing3Disable() and re-enables host calls.
*
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
* @thread EMT.
*/
VMMRZDECL(void) VMMRZCallRing3Enable(PVMCPUCC pVCpu)
{
VMCPU_ASSERT_EMT(pVCpu);
#if defined(LOG_ENABLED) && defined(IN_RING0)
RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
#endif
Assert(pVCpu->vmm.s.cCallRing3Disabled > 0);
if (ASMAtomicUoDecU32(&pVCpu->vmm.s.cCallRing3Disabled) == 0)
{
#ifdef IN_RC
pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = false;
#else
# ifdef LOG_ENABLED
if (pVCpu->vmm.s.pR0LoggerR0)
pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = false;
# endif
if (pVCpu->vmm.s.pR0RelLoggerR0)
pVCpu->vmm.s.pR0RelLoggerR0->fFlushingDisabled = false;
#endif
}
#if defined(LOG_ENABLED) && defined(IN_RING0)
ASMSetFlags(fFlags);
#endif
}
/**
* Checks whether its possible to call host context or not.
*
* @returns true if it's safe, false if it isn't.
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
*/
VMMRZDECL(bool) VMMRZCallRing3IsEnabled(PVMCPUCC pVCpu)
{
VMCPU_ASSERT_EMT(pVCpu);
Assert(pVCpu->vmm.s.cCallRing3Disabled <= 16);
return pVCpu->vmm.s.cCallRing3Disabled == 0;
}
/**
* Sets the ring-0 callback before doing the ring-3 call.
*
* @param pVCpu The cross context virtual CPU structure.
* @param pfnCallback Pointer to the callback.
* @param pvUser The user argument.
*
* @return VBox status code.
*/
VMMRZDECL(int) VMMRZCallRing3SetNotification(PVMCPUCC pVCpu, R0PTRTYPE(PFNVMMR0CALLRING3NOTIFICATION) pfnCallback, RTR0PTR pvUser)
{
AssertPtrReturn(pVCpu, VERR_INVALID_POINTER);
AssertPtrReturn(pfnCallback, VERR_INVALID_POINTER);
if (pVCpu->vmm.s.pfnCallRing3CallbackR0)
return VERR_ALREADY_EXISTS;
pVCpu->vmm.s.pfnCallRing3CallbackR0 = pfnCallback;
pVCpu->vmm.s.pvCallRing3CallbackUserR0 = pvUser;
return VINF_SUCCESS;
}
/**
* Removes the ring-0 callback.
*
* @param pVCpu The cross context virtual CPU structure.
*/
VMMRZDECL(void) VMMRZCallRing3RemoveNotification(PVMCPUCC pVCpu)
{
pVCpu->vmm.s.pfnCallRing3CallbackR0 = NULL;
}
/**
* Checks whether there is a ring-0 callback notification active.
*
* @param pVCpu The cross context virtual CPU structure.
* @returns true if there the notification is active, false otherwise.
*/
VMMRZDECL(bool) VMMRZCallRing3IsNotificationSet(PVMCPUCC pVCpu)
{
return pVCpu->vmm.s.pfnCallRing3CallbackR0 != NULL;
}
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