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/* $Id$ */
/** @file
* REM - Recompiled Execution Monitor, all Contexts part.
*/
/*
* Copyright (C) 2006-2017 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_REM
#ifdef VBOX_WITH_REM
# include <VBox/vmm/rem.h>
#endif
#include <VBox/vmm/em.h>
#include <VBox/vmm/vmm.h>
#include "REMInternal.h"
#include <VBox/vmm/vm.h>
#include <VBox/err.h>
#include <VBox/log.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#ifndef IN_RING3
/**
* Records a invlpg instruction for replaying upon REM entry.
*
* @param pVM The cross context VM structure.
* @param GCPtrPage The
*/
VMMDECL(void) REMNotifyInvalidatePage(PVM pVM, RTGCPTR GCPtrPage)
{
/*
* Try take the REM lock and push the address onto the array.
*/
if ( pVM->rem.s.cInvalidatedPages < RT_ELEMENTS(pVM->rem.s.aGCPtrInvalidatedPages)
&& EMRemTryLock(pVM) == VINF_SUCCESS)
{
uint32_t iPage = pVM->rem.s.cInvalidatedPages;
if (iPage < RT_ELEMENTS(pVM->rem.s.aGCPtrInvalidatedPages))
{
ASMAtomicWriteU32(&pVM->rem.s.cInvalidatedPages, iPage + 1);
pVM->rem.s.aGCPtrInvalidatedPages[iPage] = GCPtrPage;
EMRemUnlock(pVM);
return;
}
CPUMSetChangedFlags(VMMGetCpu(pVM), CPUM_CHANGED_GLOBAL_TLB_FLUSH); /** @todo this array should be per-cpu technically speaking. */
ASMAtomicWriteU32(&pVM->rem.s.cInvalidatedPages, 0); /** @todo leave this alone? Optimize this code? */
EMRemUnlock(pVM);
}
else
{
/* Fallback: Simply tell the recompiler to flush its TLB. */
CPUMSetChangedFlags(VMMGetCpu(pVM), CPUM_CHANGED_GLOBAL_TLB_FLUSH);
ASMAtomicWriteU32(&pVM->rem.s.cInvalidatedPages, 0); /** @todo leave this alone?! Optimize this code? */
}
return;
}
/**
* Insert pending notification
*
* @param pVM The cross context VM structure.
* @param pRec Notification record to insert
*/
static void remNotifyHandlerInsert(PVM pVM, PREMHANDLERNOTIFICATION pRec)
{
/*
* Fetch a free record.
*/
uint32_t cFlushes = 0;
uint32_t idxFree;
PREMHANDLERNOTIFICATION pFree;
do
{
idxFree = ASMAtomicUoReadU32(&pVM->rem.s.idxFreeList);
if (idxFree == UINT32_MAX)
{
do
{
cFlushes++;
Assert(cFlushes != 128);
AssertFatal(cFlushes < _1M);
VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_REM_REPLAY_HANDLER_NOTIFICATIONS, 0);
idxFree = ASMAtomicUoReadU32(&pVM->rem.s.idxFreeList);
} while (idxFree == UINT32_MAX);
}
pFree = &pVM->rem.s.aHandlerNotifications[idxFree];
} while (!ASMAtomicCmpXchgU32(&pVM->rem.s.idxFreeList, pFree->idxNext, idxFree));
/*
* Copy the record.
*/
pFree->enmKind = pRec->enmKind;
pFree->u = pRec->u;
/*
* Insert it into the pending list.
*/
uint32_t idxNext;
do
{
idxNext = ASMAtomicUoReadU32(&pVM->rem.s.idxPendingList);
ASMAtomicWriteU32(&pFree->idxNext, idxNext);
ASMCompilerBarrier();
} while (!ASMAtomicCmpXchgU32(&pVM->rem.s.idxPendingList, idxFree, idxNext));
VM_FF_SET(pVM, VM_FF_REM_HANDLER_NOTIFY);
}
/**
* Notification about a successful PGMR3HandlerPhysicalRegister() call.
*
* @param pVM The cross context VM structure.
* @param enmKind Kind of access handler.
* @param GCPhys Handler range address.
* @param cb Size of the handler range.
* @param fHasHCHandler Set if the handler have a HC callback function.
*/
VMMDECL(void) REMNotifyHandlerPhysicalRegister(PVM pVM, PGMPHYSHANDLERKIND enmKind, RTGCPHYS GCPhys, RTGCPHYS cb, bool fHasHCHandler)
{
REMHANDLERNOTIFICATION Rec;
Rec.enmKind = REMHANDLERNOTIFICATIONKIND_PHYSICAL_REGISTER;
Rec.u.PhysicalRegister.enmKind = enmKind;
Rec.u.PhysicalRegister.GCPhys = GCPhys;
Rec.u.PhysicalRegister.cb = cb;
Rec.u.PhysicalRegister.fHasHCHandler = fHasHCHandler;
remNotifyHandlerInsert(pVM, &Rec);
}
/**
* Notification about a successful PGMR3HandlerPhysicalDeregister() operation.
*
* @param pVM The cross context VM structure.
* @param enmKind Kind of access handler.
* @param GCPhys Handler range address.
* @param cb Size of the handler range.
* @param fHasHCHandler Set if the handler have a HC callback function.
* @param fRestoreAsRAM Whether the to restore it as normal RAM or as unassigned memory.
*/
VMMDECL(void) REMNotifyHandlerPhysicalDeregister(PVM pVM, PGMPHYSHANDLERKIND enmKind, RTGCPHYS GCPhys, RTGCPHYS cb, bool fHasHCHandler, bool fRestoreAsRAM)
{
REMHANDLERNOTIFICATION Rec;
Rec.enmKind = REMHANDLERNOTIFICATIONKIND_PHYSICAL_DEREGISTER;
Rec.u.PhysicalDeregister.enmKind = enmKind;
Rec.u.PhysicalDeregister.GCPhys = GCPhys;
Rec.u.PhysicalDeregister.cb = cb;
Rec.u.PhysicalDeregister.fHasHCHandler = fHasHCHandler;
Rec.u.PhysicalDeregister.fRestoreAsRAM = fRestoreAsRAM;
remNotifyHandlerInsert(pVM, &Rec);
}
/**
* Notification about a successful PGMR3HandlerPhysicalModify() call.
*
* @param pVM The cross context VM structure.
* @param enmKind Kind of access handler.
* @param GCPhysOld Old handler range address.
* @param GCPhysNew New handler range address.
* @param cb Size of the handler range.
* @param fHasHCHandler Set if the handler have a HC callback function.
* @param fRestoreAsRAM Whether the to restore it as normal RAM or as unassigned memory.
*/
VMMDECL(void) REMNotifyHandlerPhysicalModify(PVM pVM, PGMPHYSHANDLERKIND enmKind, RTGCPHYS GCPhysOld, RTGCPHYS GCPhysNew, RTGCPHYS cb, bool fHasHCHandler, bool fRestoreAsRAM)
{
REMHANDLERNOTIFICATION Rec;
Rec.enmKind = REMHANDLERNOTIFICATIONKIND_PHYSICAL_MODIFY;
Rec.u.PhysicalModify.enmKind = enmKind;
Rec.u.PhysicalModify.GCPhysOld = GCPhysOld;
Rec.u.PhysicalModify.GCPhysNew = GCPhysNew;
Rec.u.PhysicalModify.cb = cb;
Rec.u.PhysicalModify.fHasHCHandler = fHasHCHandler;
Rec.u.PhysicalModify.fRestoreAsRAM = fRestoreAsRAM;
remNotifyHandlerInsert(pVM, &Rec);
}
#endif /* !IN_RING3 */
#ifdef IN_RC
/**
* Flushes the physical handler notifications if the queue is almost full.
*
* This is for avoiding trouble in RC when changing CR3.
*
* @param pVM The cross context VM structure.
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
*/
VMMDECL(void) REMNotifyHandlerPhysicalFlushIfAlmostFull(PVM pVM, PVMCPU pVCpu)
{
Assert(pVM->cCpus == 1); NOREF(pVCpu);
/*
* Less than 48 items means we should flush.
*/
uint32_t cFree = 0;
for (uint32_t idx = pVM->rem.s.idxFreeList;
idx != UINT32_MAX;
idx = pVM->rem.s.aHandlerNotifications[idx].idxNext)
{
Assert(idx < RT_ELEMENTS(pVM->rem.s.aHandlerNotifications));
if (++cFree >= 48)
return;
}
AssertRelease(VM_FF_IS_SET(pVM, VM_FF_REM_HANDLER_NOTIFY));
AssertRelease(pVM->rem.s.idxPendingList != UINT32_MAX);
/* Ok, we gotta flush them. */
VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_REM_REPLAY_HANDLER_NOTIFICATIONS, 0);
AssertRelease(pVM->rem.s.idxPendingList == UINT32_MAX);
AssertRelease(pVM->rem.s.idxFreeList != UINT32_MAX);
}
#endif /* IN_RC */
/**
* Make REM flush all translation block upon the next call to REMR3State().
*
* @param pVM The cross context VM structure.
*/
VMMDECL(void) REMFlushTBs(PVM pVM)
{
LogFlow(("REMFlushTBs: fFlushTBs=%RTbool fInREM=%RTbool fInStateSync=%RTbool\n",
pVM->rem.s.fFlushTBs, pVM->rem.s.fInREM, pVM->rem.s.fInStateSync));
pVM->rem.s.fFlushTBs = true;
}
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