/** @file * * VBox - PGM PD Cache Manager */ /* * Copyright (C) 2006 InnoTek Systemberatung GmbH * * 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 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. * * If you received this file as part of a commercial VirtualBox * distribution, then only the terms of your commercial VirtualBox * license agreement apply instead of the previous paragraph. */ #ifndef __PGMCache_h__ #define __PGMCache_h__ #if !defined(IN_PGM_R3) && !defined(IN_PGM_R0) && !defined(IN_PGM_GC) # error "Not in PGM! This is an internal header!" #endif #define PGMCACHE_PHYSREG_DESCRIPTION "PGM Cache PT write handler" #define PGMCACHE_MAX_CACHED_PDES 32 #define PGMCACHE_MAX_CACHED_ENTRIES 8 #define PGMCACHE_INVALID_INDEX 0xffffffff #define PGMCACHE_FILL_THRESHOLD 5000 //#define PGMCACHE_FILL_THRESHOLD 500 #define PGMCACHE_INSERT_BOOST 500 #define PGMCACHE_SYNCPT_USER_INC 10 #define PGMCACHE_SYNCPT_SUPERVISOR_INC 20 #define PGMCACHE_SYNCPAGE_USER_INC 1 #define PGMCACHE_SYNCPAGE_SUPERVISOR_INC 2 #define PGMCACHE_CACHE_HIT_INC 50 #define PGMCACHE_LEAVEGC_DEC -1 #define PGMCACHE_SIGNIFICANT_PTWRITE_DEC -5 #define PGMCACHE_PTWRITE_DEC -2 #define PGMCACHE_UNKNOWN_PTWRITE_DEC -100 #define PGMCACHE_PDE_CHANGE_DEC -250 #define PGMCACHE_PDE_CR3_MAPPING -2500 #define PGMCACHE_PDE_CONFLICT_DEC -1000 #define PGMCACHE_PDE_CHANGE_HIT_INC (PGMCACHE_CACHE_HIT_INC) #define PGMCACHE_MAX_DIRTY_PAGES 4 /* define to enable PD caching */ //#define PGM_PD_CACHING_ENABLED #ifdef VBOX_STRICT /* define to enable strict PD checking */ //#define PGM_CACHE_STRICT /* define to enable paranoid checking */ //#define PGM_CACHE_VERY_STRICT // #define PGM_CACHE_EXTREMELY_STRICT #endif #define PGMCACHE_GET_ACTIVE_ENTRY(pLine) \ (pLine->iActiveEntry != PGMCACHE_INVALID_INDEX) ? &pLine->entry[pLine->iActiveEntry] : NULL typedef struct { /* Caching score */ unsigned u29Score : 29; /* PD is waiting to be cached */ unsigned u1Queued : 1; /* PD is cached */ unsigned u1Cached : 1; /* Cache disabled flag */ unsigned u1CacheDisabled : 1; } PDESTAT, *PPDESTAT; typedef struct { /* Copy of guest PDE */ X86PDEPAE PdeGst; /* Shadow PT physical address */ RTGCPHYS PtShwPhys; /* Multiple dirty accesses -> flush entry */ bool fDirtyFlush; /* Dirty flag */ bool fDirty; /* Dirty state is pending until the PD is activated */ bool fDirtyPending; /* GC address of PT write */ RTGCUINTPTR pvFaultDirty[PGMCACHE_MAX_DIRTY_PAGES]; uint32_t cNumDirtyPages; /* Cache entry score */ uint32_t uScore; /* Cache line index */ uint32_t iLine; /* Cache entry index */ uint32_t iEntry; } PDCACHEENTRY, *PPDCACHEENTRY; typedef struct { /* Shadow page directory index (0-2047, PGMCACHE_INVALID_INDEX when unused) */ uint32_t iPDShw; /* Guest context address that corresponds to the shadow iPD */ RTGCUINTPTR GCPtrPDE; /* Set when the cache entry is modified */ bool fRefresh; uint32_t iPDShwNew; uint32_t iPDShwOld; /* Currently used cache entry */ uint32_t iActiveEntry; /* Cache index line */ uint32_t iLine; PDCACHEENTRY entry[PGMCACHE_MAX_CACHED_ENTRIES]; } PDCACHELINE, *PPDCACHELINE; typedef struct { /* Cached PDEs */ PDCACHELINE line[PGMCACHE_MAX_CACHED_PDES]; /* Lowest score of all cached PDEs. */ uint32_t ulLowestScore; /* Caching statistics for all PDEs. */ PDESTAT pd[2048]; /* Set when a cache entry is modified. */ bool fChanged; /* Caching enabled. */ bool fEnabled; /* Max nr of host PDEs (PAE vs 32 bits). */ uint32_t cbMaxPDEs; /* PD shift for host paging. */ uint32_t ShwPDShift; /* PD size for host paging. */ uint32_t cbShwPD; #ifdef DEBUG uint32_t cr3; SUPPAGINGMODE enmHostMode; #endif } PDCACHE, *PPDCACHE; /** * Initialise PGM caching subsystem * * @returns VBox status code. * @param pVM The virtual machine. * @param enmHostMode Host paging mode */ int pgmr3CacheInit(PVM pVM, SUPPAGINGMODE enmHostMode); /** * Reset PGM caching subsystem * * @returns VBox status code. * @param pVM The virtual machine. * @param enmHostMode Host paging mode */ int pgmr3CacheReset(PVM pVM, SUPPAGINGMODE enmHostMode); /** * Inform the PGM Cache Manager when exiting the guest context * * @returns VBox status code. * @param pVM The virtual machine. * @param pCtx Current CPU context * @param u32Reason Reason for exiting the guest context * Currently only for VINF_EM_RAW_INTERRUPT! */ int pgmr3CacheLeaveGC(PVM pVM, PCPUMCTX pCtx, uint32_t u32Reason); /** * Inform the PGM Cache Manager about a pending Sync PD action (called * from PGMR3SyncPD only!) * * @returns VBox status code. * @param pVM The virtual machine. * @param cr0 Current CR0 register value * @param cr3 Current CR3 register value * @param cr4 Current CR4 register value */ int pgmr3CacheSyncPD(PVM pVM, uint32_t cr0, uint32_t cr3, uint32_t cr4); /** * Mark all cache lines and entries as dirty. * * @returns VBox status code. * @param pVM The virtual machine. */ int pgmr3CacheGlobalFlush(PVM pVM); #ifdef VBOX_STRICT /** * Checks the guest and shadow tables for consistency. * * @returns VBox status code. * @param pVM The virtual machine. * @param cr0 Current CR0 register value * @param cr3 Current CR3 register value * @param cr4 Current CR4 register value */ void pgmCacheCheckPD(PVM pVM, uint32_t cr0, uint32_t cr3, uint32_t cr4); /** * Checks the cache line if it is marked dirty. * * @returns boolean; true if the line is marked dirty, otherwise false * @param pVM The virtual machine. * @param iPDShw Page directory entry */ bool pgmCacheIsLineDirty(PVM pVM, uint32_t iPDShw); #else #define pgmr3CacheCheckPD(a, b, c, d) #define pgmCacheIsLineDirty(a, b) false #define pgmCacheCheckPDE(a, b) #endif #ifdef PGM_CACHE_EXTREMELY_STRICT /** * Check cache line integrity * * @param pVM The virtual machine. * @param pLine Cache line * @param pEntry Cache entry */ void pgmCacheCheckIntegrity(PVM pVM, PPDCACHELINE pLine, PPDCACHEENTRY pEntry); #else #define pgmCacheCheckIntegrity(a, b, c) #endif /** * Cache PDE * * @returns VBox status code. * @param pVM The virtual machine. * @param iPDShw Page directory index */ int pgmCacheInsertPD(PVM pVM, uint32_t iPDShw); /** * Invalidate cached PDE. * * @returns VBox status code. * @param pVM The virtual machine. * @param iLine Cache line index * @param penalty Score penalty for invalidation */ int pgmCacheInvalidateLine(PVM pVM, uint32_t iLine, int penalty); /** * Invalidate cached PDE * * @returns VBox status code. * @param pVM The virtual machine. * @param iPDShw PDE index * @param penalty Score penalty for invalidation */ int pgmCacheInvalidate(PVM pVM, uint32_t iPDShw, int penalty); /** * Invalidate all cached PDEs * * @returns VBox status code. * @param pVM The virtual machine. */ int pgmCacheInvalidateAll(PVM pVM); /** * Update record for specified PD * * @returns VBox status code. * @param pVM The virtual machine. * @param iPDShw Page directory index * @param delta Score increment/decrement */ int pgmCacheUpdatePD(PVM pVM, uint32_t iPDShw, int delta); /** * Update record for specified PD * * @returns VBox status code. * @param pVM The virtual machine. * @param iLine Cache line index * @param iEntry Cache entry index * @param delta Score increment/decrement */ int pgmCacheUpdateEntry(PVM pVM, uint32_t iLine, uint32_t iEntry, int delta); /** * Update record for specified PD + all cache entries * * @returns VBox status code. * @param pVM The virtual machine. * @param iPDShw Page directory index * @param delta Score increment/decrement */ int pgmCacheUpdateAll(PVM pVM, uint32_t iPDShw, int delta); /** * Remove the handler for the supplied physical page * (@todo maybe this should be a physical range instead ) * * @returns VBox status code. * @param pVM The virtual machine. * @param GCPhys GC physical address */ int pgmCacheRemovePhyshandler(PVM pVM, RTGCPHYS GCPhys); /** * Check if a page directory entry is cached * * @returns true if cached, otherwise false * @param pPdCache PGM cache record pointer * @param iPDShw Page directory index */ inline bool pgmCacheIsPDCached(PPDCACHE pPdCache, uint32_t iPDShw) { #ifdef PGM_PD_CACHING_ENABLED if (iPDShw < pPdCache->cbMaxPDEs) { return !!pPdCache->pd[iPDShw].u1Cached; } #endif return false; } /** * Check if a page directory entry is cached * * @returns true if cached, otherwise false * @param pVM The virtual machine. * @param iPDShw Page directory index */ bool pgmCacheIsPDCached(PVM pVM, uint32_t iPDShw); /** * Checks if the PDE has been changed * * @returns boolean * @param pVM The virtual machine. * @param iPDShw Page directory entry */ bool pgmCacheHasPDEChanged(PVM pVM, uint32_t iPDShw); /** * Checks if the PDE has been changed * * @returns boolean * @param pVM The virtual machine. * @param pLine Cache line */ bool pgmCacheHasPDEChanged(PVM pVM, PPDCACHELINE pLine); /** * Invalidate entry in shadow page directory * * @returns VBox status code. * @param iPDShw PDE index * @param iPDShw Page directory index */ void pgmInvalidatePD(PVM pVM, uint32_t iPDShw); /** * Activate a cached PD (called by SyncPT when it is synced for the first time). * * @returns VBox status code. * @param pVM The virtual machine. * @param iPDShw PDE index */ int pgmCacheActivatePD(PVM pVM, uint32_t iPDShw); /** * Clean up dirty cache entry * * @returns VBox status code. * @param pVM The virtual machine. * @param pLine Cache line pointer * @param pEntry Cache entry pointer */ int pgmCacheHandleDirtyEntry(PVM pVM, PPDCACHELINE pLine, PPDCACHEENTRY pEntry); DECLEXPORT(int) pgmCachePTWrite(PVM pVM, RTGCPHYS GCPhys, void *pvPhys, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser); #endif /* !__PGMCache_h__ */