/* $Id: REMAll.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */ /** @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 #endif #include #include #include "REMInternal.h" #include #include #include #include #include #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; }