/* $Id: PGMR0DynMap.cpp 18984 2009-04-17 09:00:22Z vboxsync $ */ /** @file * PGM - Page Manager and Monitor, ring-0 dynamic mapping cache. */ /* * Copyright (C) 2008 Sun Microsystems, Inc. * * 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. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa * Clara, CA 95054 USA or visit http://www.sun.com if you need * additional information or have any questions. */ /******************************************************************************* * Internal Functions * *******************************************************************************/ #define LOG_GROUP LOG_GROUP_PGM #include #include "../PGMInternal.h" #include #include #include #include #include #include #include #include #include #include #include #include /******************************************************************************* * Defined Constants And Macros * *******************************************************************************/ /** The max size of the mapping cache (in pages). */ #define PGMR0DYNMAP_MAX_PAGES ((16*_1M) >> PAGE_SHIFT) /** The small segment size that is adopted on out-of-memory conditions with a * single big segment. */ #define PGMR0DYNMAP_SMALL_SEG_PAGES 128 /** The number of pages we reserve per CPU. */ #define PGMR0DYNMAP_PAGES_PER_CPU 256 /** The minimum number of pages we reserve per CPU. * This must be equal or larger than the autoset size. */ #define PGMR0DYNMAP_PAGES_PER_CPU_MIN 64 /** The number of guard pages. * @remarks Never do tuning of the hashing or whatnot with a strict build! */ #if defined(VBOX_STRICT) # define PGMR0DYNMAP_GUARD_PAGES 1 #else # define PGMR0DYNMAP_GUARD_PAGES 0 #endif /** The dummy physical address of guard pages. */ #define PGMR0DYNMAP_GUARD_PAGE_HCPHYS UINT32_C(0x7777feed) /** The dummy reference count of guard pages. (Must be non-zero.) */ #define PGMR0DYNMAP_GUARD_PAGE_REF_COUNT INT32_C(0x7777feed) #if 0 /** Define this to just clear the present bit on guard pages. * The alternative is to replace the entire PTE with an bad not-present * PTE. Either way, XNU will screw us. :-/ */ #define PGMR0DYNMAP_GUARD_NP #endif /** The dummy PTE value for a page. */ #define PGMR0DYNMAP_GUARD_PAGE_LEGACY_PTE X86_PTE_PG_MASK /** The dummy PTE value for a page. */ #define PGMR0DYNMAP_GUARD_PAGE_PAE_PTE UINT64_MAX /*X86_PTE_PAE_PG_MASK*/ /** Calcs the overload threshold. Current set at 50%. */ #define PGMR0DYNMAP_CALC_OVERLOAD(cPages) ((cPages) / 2) #if 0 /* Assertions causes panics if preemption is disabled, this can be used to work aroudn that. */ //#define RTSpinlockAcquire(a,b) do {} while (0) //#define RTSpinlockRelease(a,b) do {} while (0) #endif /******************************************************************************* * Structures and Typedefs * *******************************************************************************/ /** * Ring-0 dynamic mapping cache segment. * * The dynamic mapping cache can be extended with additional segments if the * load is found to be too high. This done the next time a VM is created, under * the protection of the init mutex. The arrays is reallocated and the new * segment is added to the end of these. Nothing is rehashed of course, as the * indexes / addresses must remain unchanged. * * This structure is only modified while owning the init mutex or during module * init / term. */ typedef struct PGMR0DYNMAPSEG { /** Pointer to the next segment. */ struct PGMR0DYNMAPSEG *pNext; /** The memory object for the virtual address range that we're abusing. */ RTR0MEMOBJ hMemObj; /** The start page in the cache. (I.e. index into the arrays.) */ uint16_t iPage; /** The number of pages this segment contributes. */ uint16_t cPages; /** The number of page tables. */ uint16_t cPTs; /** The memory objects for the page tables. */ RTR0MEMOBJ ahMemObjPTs[1]; } PGMR0DYNMAPSEG; /** Pointer to a ring-0 dynamic mapping cache segment. */ typedef PGMR0DYNMAPSEG *PPGMR0DYNMAPSEG; /** * Ring-0 dynamic mapping cache entry. * * This structure tracks */ typedef struct PGMR0DYNMAPENTRY { /** The physical address of the currently mapped page. * This is duplicate for three reasons: cache locality, cache policy of the PT * mappings and sanity checks. */ RTHCPHYS HCPhys; /** Pointer to the page. */ void *pvPage; /** The number of references. */ int32_t volatile cRefs; /** PTE pointer union. */ union PGMR0DYNMAPENTRY_PPTE { /** PTE pointer, 32-bit legacy version. */ PX86PTE pLegacy; /** PTE pointer, PAE version. */ PX86PTEPAE pPae; /** PTE pointer, the void version. */ void *pv; } uPte; /** CPUs that haven't invalidated this entry after it's last update. */ RTCPUSET PendingSet; } PGMR0DYNMAPENTRY; /** Pointer to a ring-0 dynamic mapping cache entry. */ typedef PGMR0DYNMAPENTRY *PPGMR0DYNMAPENTRY; /** * Ring-0 dynamic mapping cache. * * This is initialized during VMMR0 module init but no segments are allocated at * that time. Segments will be added when the first VM is started and removed * again when the last VM shuts down, thus avoid consuming memory while dormant. * At module termination, the remaining bits will be freed up. */ typedef struct PGMR0DYNMAP { /** The usual magic number / eye catcher (PGMR0DYNMAP_MAGIC). */ uint32_t u32Magic; /** Spinlock serializing the normal operation of the cache. */ RTSPINLOCK hSpinlock; /** Array for tracking and managing the pages. */ PPGMR0DYNMAPENTRY paPages; /** The cache size given as a number of pages. */ uint32_t cPages; /** Whether it's 32-bit legacy or PAE/AMD64 paging mode. */ bool fLegacyMode; /** The current load. * This does not include guard pages. */ uint32_t cLoad; /** The max load ever. * This is maintained to get trigger adding of more mapping space. */ uint32_t cMaxLoad; /** Initialization / termination lock. */ RTSEMFASTMUTEX hInitLock; /** The number of guard pages. */ uint32_t cGuardPages; /** The number of users (protected by hInitLock). */ uint32_t cUsers; /** Array containing a copy of the original page tables. * The entries are either X86PTE or X86PTEPAE according to fLegacyMode. */ void *pvSavedPTEs; /** List of segments. */ PPGMR0DYNMAPSEG pSegHead; /** The paging mode. */ SUPPAGINGMODE enmPgMode; } PGMR0DYNMAP; /** Pointer to the ring-0 dynamic mapping cache */ typedef PGMR0DYNMAP *PPGMR0DYNMAP; /** PGMR0DYNMAP::u32Magic. (Jens Christian Bugge Wesseltoft) */ #define PGMR0DYNMAP_MAGIC 0x19640201 /** * Paging level data. */ typedef struct PGMR0DYNMAPPGLVL { uint32_t cLevels; /**< The number of levels. */ struct { RTHCPHYS HCPhys; /**< The address of the page for the current level, * i.e. what hMemObj/hMapObj is currently mapping. */ RTHCPHYS fPhysMask; /**< Mask for extracting HCPhys from uEntry. */ RTR0MEMOBJ hMemObj; /**< Memory object for HCPhys, PAGE_SIZE. */ RTR0MEMOBJ hMapObj; /**< Mapping object for hMemObj. */ uint32_t fPtrShift; /**< The pointer shift count. */ uint64_t fPtrMask; /**< The mask to apply to the shifted pointer to get the table index. */ uint64_t fAndMask; /**< And mask to check entry flags. */ uint64_t fResMask; /**< The result from applying fAndMask. */ union { void *pv; /**< hMapObj address. */ PX86PGUINT paLegacy; /**< Legacy table view. */ PX86PGPAEUINT paPae; /**< PAE/AMD64 table view. */ } u; } a[4]; } PGMR0DYNMAPPGLVL; /** Pointer to paging level data. */ typedef PGMR0DYNMAPPGLVL *PPGMR0DYNMAPPGLVL; /******************************************************************************* * Global Variables * *******************************************************************************/ /** Pointer to the ring-0 dynamic mapping cache. */ static PPGMR0DYNMAP g_pPGMR0DynMap; /** For overflow testing. */ static bool g_fPGMR0DynMapTestRunning = false; /******************************************************************************* * Internal Functions * *******************************************************************************/ static void pgmR0DynMapReleasePage(PPGMR0DYNMAP pThis, uint32_t iPage, uint32_t cRefs); static int pgmR0DynMapSetup(PPGMR0DYNMAP pThis); static int pgmR0DynMapExpand(PPGMR0DYNMAP pThis); static void pgmR0DynMapTearDown(PPGMR0DYNMAP pThis); #if 0 /*def DEBUG*/ static int pgmR0DynMapTest(PVM pVM); #endif /** * Initializes the ring-0 dynamic mapping cache. * * @returns VBox status code. */ VMMR0DECL(int) PGMR0DynMapInit(void) { Assert(!g_pPGMR0DynMap); /* * Create and initialize the cache instance. */ PPGMR0DYNMAP pThis = (PPGMR0DYNMAP)RTMemAllocZ(sizeof(*pThis)); AssertLogRelReturn(pThis, VERR_NO_MEMORY); int rc = VINF_SUCCESS; pThis->enmPgMode = SUPR0GetPagingMode(); switch (pThis->enmPgMode) { case SUPPAGINGMODE_32_BIT: case SUPPAGINGMODE_32_BIT_GLOBAL: pThis->fLegacyMode = false; break; case SUPPAGINGMODE_PAE: case SUPPAGINGMODE_PAE_GLOBAL: case SUPPAGINGMODE_PAE_NX: case SUPPAGINGMODE_PAE_GLOBAL_NX: case SUPPAGINGMODE_AMD64: case SUPPAGINGMODE_AMD64_GLOBAL: case SUPPAGINGMODE_AMD64_NX: case SUPPAGINGMODE_AMD64_GLOBAL_NX: pThis->fLegacyMode = false; break; default: rc = VERR_INTERNAL_ERROR; break; } if (RT_SUCCESS(rc)) { rc = RTSemFastMutexCreate(&pThis->hInitLock); if (RT_SUCCESS(rc)) { rc = RTSpinlockCreate(&pThis->hSpinlock); if (RT_SUCCESS(rc)) { pThis->u32Magic = PGMR0DYNMAP_MAGIC; g_pPGMR0DynMap = pThis; return VINF_SUCCESS; } RTSemFastMutexDestroy(pThis->hInitLock); } } RTMemFree(pThis); return rc; } /** * Terminates the ring-0 dynamic mapping cache. */ VMMR0DECL(void) PGMR0DynMapTerm(void) { /* * Destroy the cache. * * There is not supposed to be any races here, the loader should * make sure about that. So, don't bother locking anything. * * The VM objects should all be destroyed by now, so there is no * dangling users or anything like that to clean up. This routine * is just a mirror image of PGMR0DynMapInit. */ PPGMR0DYNMAP pThis = g_pPGMR0DynMap; if (pThis) { AssertPtr(pThis); g_pPGMR0DynMap = NULL; /* This should *never* happen, but in case it does try not to leak memory. */ AssertLogRelMsg(!pThis->cUsers && !pThis->paPages && !pThis->pvSavedPTEs && !pThis->cPages, ("cUsers=%d paPages=%p pvSavedPTEs=%p cPages=%#x\n", pThis->cUsers, pThis->paPages, pThis->pvSavedPTEs, pThis->cPages)); if (pThis->paPages) pgmR0DynMapTearDown(pThis); /* Free the associated resources. */ RTSemFastMutexDestroy(pThis->hInitLock); pThis->hInitLock = NIL_RTSEMFASTMUTEX; RTSpinlockDestroy(pThis->hSpinlock); pThis->hSpinlock = NIL_RTSPINLOCK; pThis->u32Magic = UINT32_MAX; RTMemFree(pThis); } } /** * Initializes the dynamic mapping cache for a new VM. * * @returns VBox status code. * @param pVM Pointer to the shared VM structure. */ VMMR0DECL(int) PGMR0DynMapInitVM(PVM pVM) { AssertMsgReturn(!pVM->pgm.s.pvR0DynMapUsed, ("%p (pThis=%p)\n", pVM->pgm.s.pvR0DynMapUsed, g_pPGMR0DynMap), VERR_WRONG_ORDER); /* * Initialize the auto sets. */ VMCPUID idCpu = pVM->cCPUs; AssertReturn(idCpu > 0 && idCpu <= VMCPU_MAX_CPU_COUNT, VERR_INTERNAL_ERROR); while (idCpu-- > 0) { PPGMMAPSET pSet = &pVM->aCpus[idCpu].pgm.s.AutoSet; uint32_t j = RT_ELEMENTS(pSet->aEntries); while (j-- > 0) { pSet->aEntries[j].iPage = UINT16_MAX; pSet->aEntries[j].cRefs = 0; pSet->aEntries[j].pvPage = NULL; pSet->aEntries[j].HCPhys = NIL_RTHCPHYS; } pSet->cEntries = PGMMAPSET_CLOSED; pSet->iSubset = UINT32_MAX; pSet->iCpu = -1; memset(&pSet->aiHashTable[0], 0xff, sizeof(pSet->aiHashTable)); } /* * Do we need the cache? Skip the last bit if we don't. */ if (!VMMIsHwVirtExtForced(pVM)) return VINF_SUCCESS; /* * Reference and if necessary setup or expand the cache. */ PPGMR0DYNMAP pThis = g_pPGMR0DynMap; AssertPtrReturn(pThis, VERR_INTERNAL_ERROR); int rc = RTSemFastMutexRequest(pThis->hInitLock); AssertLogRelRCReturn(rc, rc); pThis->cUsers++; if (pThis->cUsers == 1) { rc = pgmR0DynMapSetup(pThis); #if 0 /*def DEBUG*/ if (RT_SUCCESS(rc)) { rc = pgmR0DynMapTest(pVM); if (RT_FAILURE(rc)) pgmR0DynMapTearDown(pThis); } #endif } else if (pThis->cMaxLoad > PGMR0DYNMAP_CALC_OVERLOAD(pThis->cPages - pThis->cGuardPages)) rc = pgmR0DynMapExpand(pThis); if (RT_SUCCESS(rc)) pVM->pgm.s.pvR0DynMapUsed = pThis; else pThis->cUsers--; RTSemFastMutexRelease(pThis->hInitLock); return rc; } /** * Terminates the dynamic mapping cache usage for a VM. * * @param pVM Pointer to the shared VM structure. */ VMMR0DECL(void) PGMR0DynMapTermVM(PVM pVM) { /* * Return immediately if we're not using the cache. */ if (!pVM->pgm.s.pvR0DynMapUsed) return; PPGMR0DYNMAP pThis = g_pPGMR0DynMap; AssertPtrReturnVoid(pThis); int rc = RTSemFastMutexRequest(pThis->hInitLock); AssertLogRelRCReturnVoid(rc); if (pVM->pgm.s.pvR0DynMapUsed == pThis) { pVM->pgm.s.pvR0DynMapUsed = NULL; #ifdef VBOX_STRICT PGMR0DynMapAssertIntegrity(); #endif /* * Clean up and check the auto sets. */ VMCPUID idCpu = pVM->cCPUs; while (idCpu-- > 0) { PPGMMAPSET pSet = &pVM->aCpus[idCpu].pgm.s.AutoSet; uint32_t j = pSet->cEntries; if (j <= RT_ELEMENTS(pSet->aEntries)) { /* * The set is open, close it. */ while (j-- > 0) { int32_t cRefs = pSet->aEntries[j].cRefs; uint32_t iPage = pSet->aEntries[j].iPage; LogRel(("PGMR0DynMapTermVM: %d dangling refs to %#x\n", cRefs, iPage)); if (iPage < pThis->cPages && cRefs > 0) pgmR0DynMapReleasePage(pThis, iPage, cRefs); else AssertLogRelMsgFailed(("cRefs=%d iPage=%#x cPages=%u\n", cRefs, iPage, pThis->cPages)); pSet->aEntries[j].iPage = UINT16_MAX; pSet->aEntries[j].cRefs = 0; pSet->aEntries[j].pvPage = NULL; pSet->aEntries[j].HCPhys = NIL_RTHCPHYS; } pSet->cEntries = PGMMAPSET_CLOSED; pSet->iSubset = UINT32_MAX; pSet->iCpu = -1; } else AssertMsg(j == PGMMAPSET_CLOSED, ("cEntries=%#x\n", j)); j = RT_ELEMENTS(pSet->aEntries); while (j-- > 0) { Assert(pSet->aEntries[j].iPage == UINT16_MAX); Assert(!pSet->aEntries[j].cRefs); } } /* * Release our reference to the mapping cache. */ Assert(pThis->cUsers > 0); pThis->cUsers--; if (!pThis->cUsers) pgmR0DynMapTearDown(pThis); } else AssertLogRelMsgFailed(("pvR0DynMapUsed=%p pThis=%p\n", pVM->pgm.s.pvR0DynMapUsed, pThis)); RTSemFastMutexRelease(pThis->hInitLock); } /** * Shoots down the TLBs for all the cache pages, pgmR0DynMapTearDown helper. * * @param idCpu The current CPU. * @param pvUser1 The dynamic mapping cache instance. * @param pvUser2 Unused, NULL. */ static DECLCALLBACK(void) pgmR0DynMapShootDownTlbs(RTCPUID idCpu, void *pvUser1, void *pvUser2) { Assert(!pvUser2); PPGMR0DYNMAP pThis = (PPGMR0DYNMAP)pvUser1; Assert(pThis == g_pPGMR0DynMap); PPGMR0DYNMAPENTRY paPages = pThis->paPages; uint32_t iPage = pThis->cPages; while (iPage-- > 0) ASMInvalidatePage(paPages[iPage].pvPage); } /** * Shoot down the TLBs for every single cache entry on all CPUs. * * @returns IPRT status code (RTMpOnAll). * @param pThis The dynamic mapping cache instance. */ static int pgmR0DynMapTlbShootDown(PPGMR0DYNMAP pThis) { int rc = RTMpOnAll(pgmR0DynMapShootDownTlbs, pThis, NULL); AssertRC(rc); if (RT_FAILURE(rc)) { uint32_t iPage = pThis->cPages; while (iPage-- > 0) ASMInvalidatePage(pThis->paPages[iPage].pvPage); } return rc; } /** * Calculate the new cache size based on cMaxLoad statistics. * * @returns Number of pages. * @param pThis The dynamic mapping cache instance. * @param pcMinPages The minimal size in pages. */ static uint32_t pgmR0DynMapCalcNewSize(PPGMR0DYNMAP pThis, uint32_t *pcMinPages) { Assert(pThis->cPages <= PGMR0DYNMAP_MAX_PAGES); /* cCpus * PGMR0DYNMAP_PAGES_PER_CPU(_MIN). */ RTCPUID cCpus = RTMpGetCount(); AssertReturn(cCpus > 0 && cCpus <= RTCPUSET_MAX_CPUS, 0); uint32_t cPages = cCpus * PGMR0DYNMAP_PAGES_PER_CPU; uint32_t cMinPages = cCpus * PGMR0DYNMAP_PAGES_PER_CPU_MIN; /* adjust against cMaxLoad. */ AssertMsg(pThis->cMaxLoad <= PGMR0DYNMAP_MAX_PAGES, ("%#x\n", pThis->cMaxLoad)); if (pThis->cMaxLoad > PGMR0DYNMAP_MAX_PAGES) pThis->cMaxLoad = 0; while (pThis->cMaxLoad > PGMR0DYNMAP_CALC_OVERLOAD(cPages)) cPages += PGMR0DYNMAP_PAGES_PER_CPU; if (pThis->cMaxLoad > cMinPages) cMinPages = pThis->cMaxLoad; /* adjust against max and current size. */ if (cPages < pThis->cPages) cPages = pThis->cPages; cPages *= PGMR0DYNMAP_GUARD_PAGES + 1; if (cPages > PGMR0DYNMAP_MAX_PAGES) cPages = PGMR0DYNMAP_MAX_PAGES; if (cMinPages < pThis->cPages) cMinPages = pThis->cPages; cMinPages *= PGMR0DYNMAP_GUARD_PAGES + 1; if (cMinPages > PGMR0DYNMAP_MAX_PAGES) cMinPages = PGMR0DYNMAP_MAX_PAGES; Assert(cMinPages); *pcMinPages = cMinPages; return cPages; } /** * Initializes the paging level data. * * @param pThis The dynamic mapping cache instance. * @param pPgLvl The paging level data. */ void pgmR0DynMapPagingArrayInit(PPGMR0DYNMAP pThis, PPGMR0DYNMAPPGLVL pPgLvl) { RTCCUINTREG cr4 = ASMGetCR4(); switch (pThis->enmPgMode) { case SUPPAGINGMODE_32_BIT: case SUPPAGINGMODE_32_BIT_GLOBAL: pPgLvl->cLevels = 2; pPgLvl->a[0].fPhysMask = X86_CR3_PAGE_MASK; pPgLvl->a[0].fAndMask = X86_PDE_P | X86_PDE_RW | (cr4 & X86_CR4_PSE ? X86_PDE_PS : 0); pPgLvl->a[0].fResMask = X86_PDE_P | X86_PDE_RW; pPgLvl->a[0].fPtrMask = X86_PD_MASK; pPgLvl->a[0].fPtrShift = X86_PD_SHIFT; pPgLvl->a[1].fPhysMask = X86_PDE_PG_MASK; pPgLvl->a[1].fAndMask = X86_PTE_P | X86_PTE_RW; pPgLvl->a[1].fResMask = X86_PTE_P | X86_PTE_RW; pPgLvl->a[1].fPtrMask = X86_PT_MASK; pPgLvl->a[1].fPtrShift = X86_PT_SHIFT; break; case SUPPAGINGMODE_PAE: case SUPPAGINGMODE_PAE_GLOBAL: case SUPPAGINGMODE_PAE_NX: case SUPPAGINGMODE_PAE_GLOBAL_NX: pPgLvl->cLevels = 3; pPgLvl->a[0].fPhysMask = X86_CR3_PAE_PAGE_MASK; pPgLvl->a[0].fPtrMask = X86_PDPT_MASK_PAE; pPgLvl->a[0].fPtrShift = X86_PDPT_SHIFT; pPgLvl->a[0].fAndMask = X86_PDPE_P; pPgLvl->a[0].fResMask = X86_PDPE_P; pPgLvl->a[1].fPhysMask = X86_PDPE_PG_MASK; pPgLvl->a[1].fPtrMask = X86_PD_PAE_MASK; pPgLvl->a[1].fPtrShift = X86_PD_PAE_SHIFT; pPgLvl->a[1].fAndMask = X86_PDE_P | X86_PDE_RW | (cr4 & X86_CR4_PSE ? X86_PDE_PS : 0); pPgLvl->a[1].fResMask = X86_PDE_P | X86_PDE_RW; pPgLvl->a[2].fPhysMask = X86_PDE_PAE_PG_MASK; pPgLvl->a[2].fPtrMask = X86_PT_PAE_MASK; pPgLvl->a[2].fPtrShift = X86_PT_PAE_SHIFT; pPgLvl->a[2].fAndMask = X86_PTE_P | X86_PTE_RW; pPgLvl->a[2].fResMask = X86_PTE_P | X86_PTE_RW; break; case SUPPAGINGMODE_AMD64: case SUPPAGINGMODE_AMD64_GLOBAL: case SUPPAGINGMODE_AMD64_NX: case SUPPAGINGMODE_AMD64_GLOBAL_NX: pPgLvl->cLevels = 4; pPgLvl->a[0].fPhysMask = X86_CR3_AMD64_PAGE_MASK; pPgLvl->a[0].fPtrShift = X86_PML4_SHIFT; pPgLvl->a[0].fPtrMask = X86_PML4_MASK; pPgLvl->a[0].fAndMask = X86_PML4E_P | X86_PML4E_RW; pPgLvl->a[0].fResMask = X86_PML4E_P | X86_PML4E_RW; pPgLvl->a[1].fPhysMask = X86_PML4E_PG_MASK; pPgLvl->a[1].fPtrShift = X86_PDPT_SHIFT; pPgLvl->a[1].fPtrMask = X86_PDPT_MASK_AMD64; pPgLvl->a[1].fAndMask = X86_PDPE_P | X86_PDPE_RW /** @todo check for X86_PDPT_PS support. */; pPgLvl->a[1].fResMask = X86_PDPE_P | X86_PDPE_RW; pPgLvl->a[2].fPhysMask = X86_PDPE_PG_MASK; pPgLvl->a[2].fPtrShift = X86_PD_PAE_SHIFT; pPgLvl->a[2].fPtrMask = X86_PD_PAE_MASK; pPgLvl->a[2].fAndMask = X86_PDE_P | X86_PDE_RW | (cr4 & X86_CR4_PSE ? X86_PDE_PS : 0); pPgLvl->a[2].fResMask = X86_PDE_P | X86_PDE_RW; pPgLvl->a[3].fPhysMask = X86_PDE_PAE_PG_MASK; pPgLvl->a[3].fPtrShift = X86_PT_PAE_SHIFT; pPgLvl->a[3].fPtrMask = X86_PT_PAE_MASK; pPgLvl->a[3].fAndMask = X86_PTE_P | X86_PTE_RW; pPgLvl->a[3].fResMask = X86_PTE_P | X86_PTE_RW; break; default: AssertFailed(); pPgLvl->cLevels = 0; break; } for (uint32_t i = 0; i < 4; i++) /* ASSUMING array size. */ { pPgLvl->a[i].HCPhys = NIL_RTHCPHYS; pPgLvl->a[i].hMapObj = NIL_RTR0MEMOBJ; pPgLvl->a[i].hMemObj = NIL_RTR0MEMOBJ; pPgLvl->a[i].u.pv = NULL; } } /** * Maps a PTE. * * This will update the segment structure when new PTs are mapped. * * It also assumes that we (for paranoid reasons) wish to establish a mapping * chain from CR3 to the PT that all corresponds to the processor we're * currently running on, and go about this by running with interrupts disabled * and restarting from CR3 for every change. * * @returns VBox status code, VINF_TRY_AGAIN if we changed any mappings and had * to re-enable interrupts. * @param pThis The dynamic mapping cache instance. * @param pPgLvl The paging level structure. * @param pvPage The page. * @param pSeg The segment. * @param cMaxPTs The max number of PTs expected in the segment. * @param ppvPTE Where to store the PTE address. */ static int pgmR0DynMapPagingArrayMapPte(PPGMR0DYNMAP pThis, PPGMR0DYNMAPPGLVL pPgLvl, void *pvPage, PPGMR0DYNMAPSEG pSeg, uint32_t cMaxPTs, void **ppvPTE) { Assert(!(ASMGetFlags() & X86_EFL_IF)); void *pvEntry = NULL; X86PGPAEUINT uEntry = ASMGetCR3(); for (uint32_t i = 0; i < pPgLvl->cLevels; i++) { RTHCPHYS HCPhys = uEntry & pPgLvl->a[i].fPhysMask; if (pPgLvl->a[i].HCPhys != HCPhys) { /* * Need to remap this level. * The final level, the PT, will not be freed since that is what it's all about. */ ASMIntEnable(); if (i + 1 == pPgLvl->cLevels) AssertReturn(pSeg->cPTs < cMaxPTs, VERR_INTERNAL_ERROR); else { int rc2 = RTR0MemObjFree(pPgLvl->a[i].hMemObj, true /* fFreeMappings */); AssertRC(rc2); pPgLvl->a[i].hMemObj = pPgLvl->a[i].hMapObj = NIL_RTR0MEMOBJ; } int rc = RTR0MemObjEnterPhys(&pPgLvl->a[i].hMemObj, HCPhys, PAGE_SIZE); if (RT_SUCCESS(rc)) { rc = RTR0MemObjMapKernel(&pPgLvl->a[i].hMapObj, pPgLvl->a[i].hMemObj, (void *)-1 /* pvFixed */, 0 /* cbAlignment */, RTMEM_PROT_WRITE | RTMEM_PROT_READ); if (RT_SUCCESS(rc)) { pPgLvl->a[i].u.pv = RTR0MemObjAddress(pPgLvl->a[i].hMapObj); AssertMsg(((uintptr_t)pPgLvl->a[i].u.pv & ~(uintptr_t)PAGE_OFFSET_MASK), ("%p\n", pPgLvl->a[i].u.pv)); pPgLvl->a[i].HCPhys = HCPhys; if (i + 1 == pPgLvl->cLevels) pSeg->ahMemObjPTs[pSeg->cPTs++] = pPgLvl->a[i].hMemObj; ASMIntDisable(); return VINF_TRY_AGAIN; } pPgLvl->a[i].hMapObj = NIL_RTR0MEMOBJ; } else pPgLvl->a[i].hMemObj = NIL_RTR0MEMOBJ; pPgLvl->a[i].HCPhys = NIL_RTHCPHYS; return rc; } /* * The next level. */ uint32_t iEntry = ((uint64_t)(uintptr_t)pvPage >> pPgLvl->a[i].fPtrShift) & pPgLvl->a[i].fPtrMask; if (pThis->fLegacyMode) { pvEntry = &pPgLvl->a[i].u.paLegacy[iEntry]; uEntry = pPgLvl->a[i].u.paLegacy[iEntry]; } else { pvEntry = &pPgLvl->a[i].u.paPae[iEntry]; uEntry = pPgLvl->a[i].u.paPae[iEntry]; } if ((uEntry & pPgLvl->a[i].fAndMask) != pPgLvl->a[i].fResMask) { LogRel(("PGMR0DynMap: internal error - iPgLvl=%u cLevels=%u uEntry=%#llx fAnd=%#llx fRes=%#llx got=%#llx\n" "PGMR0DynMap: pv=%p pvPage=%p iEntry=%#x fLegacyMode=%RTbool\n", i, pPgLvl->cLevels, uEntry, pPgLvl->a[i].fAndMask, pPgLvl->a[i].fResMask, uEntry & pPgLvl->a[i].fAndMask, pPgLvl->a[i].u.pv, pvPage, iEntry, pThis->fLegacyMode)); return VERR_INTERNAL_ERROR; } /*Log(("#%d: iEntry=%4d uEntry=%#llx pvEntry=%p HCPhys=%RHp \n", i, iEntry, uEntry, pvEntry, pPgLvl->a[i].HCPhys));*/ } /* made it thru without needing to remap anything. */ *ppvPTE = pvEntry; return VINF_SUCCESS; } /** * Sets up a guard page. * * @param pThis The dynamic mapping cache instance. * @param pPage The page. */ DECLINLINE(void) pgmR0DynMapSetupGuardPage(PPGMR0DYNMAP pThis, PPGMR0DYNMAPENTRY pPage) { memset(pPage->pvPage, 0xfd, PAGE_SIZE); pPage->cRefs = PGMR0DYNMAP_GUARD_PAGE_REF_COUNT; pPage->HCPhys = PGMR0DYNMAP_GUARD_PAGE_HCPHYS; #ifdef PGMR0DYNMAP_GUARD_NP ASMAtomicBitClear(pPage->uPte.pv, X86_PTE_BIT_P); #else if (pThis->fLegacyMode) ASMAtomicWriteU32(&pPage->uPte.pLegacy->u, PGMR0DYNMAP_GUARD_PAGE_LEGACY_PTE); else ASMAtomicWriteU64(&pPage->uPte.pPae->u, PGMR0DYNMAP_GUARD_PAGE_PAE_PTE); #endif pThis->cGuardPages++; } /** * Adds a new segment of the specified size. * * @returns VBox status code. * @param pThis The dynamic mapping cache instance. * @param cPages The size of the new segment, give as a page count. */ static int pgmR0DynMapAddSeg(PPGMR0DYNMAP pThis, uint32_t cPages) { int rc2; AssertReturn(ASMGetFlags() & X86_EFL_IF, VERR_PREEMPT_DISABLED); /* * Do the array reallocations first. * (The pages array has to be replaced behind the spinlock of course.) */ void *pvSavedPTEs = RTMemRealloc(pThis->pvSavedPTEs, (pThis->fLegacyMode ? sizeof(X86PGUINT) : sizeof(X86PGPAEUINT)) * (pThis->cPages + cPages)); if (!pvSavedPTEs) return VERR_NO_MEMORY; pThis->pvSavedPTEs = pvSavedPTEs; void *pvPages = RTMemAllocZ(sizeof(pThis->paPages[0]) * (pThis->cPages + cPages)); if (!pvPages) { pvSavedPTEs = RTMemRealloc(pThis->pvSavedPTEs, (pThis->fLegacyMode ? sizeof(X86PGUINT) : sizeof(X86PGPAEUINT)) * pThis->cPages); if (pvSavedPTEs) pThis->pvSavedPTEs = pvSavedPTEs; return VERR_NO_MEMORY; } RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); memcpy(pvPages, pThis->paPages, sizeof(pThis->paPages[0]) * pThis->cPages); void *pvToFree = pThis->paPages; pThis->paPages = (PPGMR0DYNMAPENTRY)pvPages; RTSpinlockRelease(pThis->hSpinlock, &Tmp); RTMemFree(pvToFree); /* * Allocate the segment structure and pages of memory, then touch all the pages (paranoia). */ uint32_t cMaxPTs = cPages / (pThis->fLegacyMode ? X86_PG_ENTRIES : X86_PG_PAE_ENTRIES) + 2; PPGMR0DYNMAPSEG pSeg = (PPGMR0DYNMAPSEG)RTMemAllocZ(RT_UOFFSETOF(PGMR0DYNMAPSEG, ahMemObjPTs[cMaxPTs])); if (!pSeg) return VERR_NO_MEMORY; pSeg->pNext = NULL; pSeg->cPages = cPages; pSeg->iPage = pThis->cPages; pSeg->cPTs = 0; int rc = RTR0MemObjAllocPage(&pSeg->hMemObj, cPages << PAGE_SHIFT, false); if (RT_SUCCESS(rc)) { uint8_t *pbPage = (uint8_t *)RTR0MemObjAddress(pSeg->hMemObj); AssertMsg(VALID_PTR(pbPage) && !((uintptr_t)pbPage & PAGE_OFFSET_MASK), ("%p\n", pbPage)); memset(pbPage, 0xfe, cPages << PAGE_SHIFT); /* * Walk thru the pages and set them up with a mapping of their PTE and everything. */ ASMIntDisable(); PGMR0DYNMAPPGLVL PgLvl; pgmR0DynMapPagingArrayInit(pThis, &PgLvl); uint32_t const iEndPage = pSeg->iPage + cPages; for (uint32_t iPage = pSeg->iPage; iPage < iEndPage; iPage++, pbPage += PAGE_SIZE) { /* Initialize the page data. */ pThis->paPages[iPage].HCPhys = NIL_RTHCPHYS; pThis->paPages[iPage].pvPage = pbPage; pThis->paPages[iPage].cRefs = 0; pThis->paPages[iPage].uPte.pPae = 0; RTCpuSetFill(&pThis->paPages[iPage].PendingSet); /* Map its page table, retry until we've got a clean run (paranoia). */ do rc = pgmR0DynMapPagingArrayMapPte(pThis, &PgLvl, pbPage, pSeg, cMaxPTs, &pThis->paPages[iPage].uPte.pv); while (rc == VINF_TRY_AGAIN); if (RT_FAILURE(rc)) break; /* Save the PTE. */ if (pThis->fLegacyMode) ((PX86PGUINT)pThis->pvSavedPTEs)[iPage] = pThis->paPages[iPage].uPte.pLegacy->u; else ((PX86PGPAEUINT)pThis->pvSavedPTEs)[iPage] = pThis->paPages[iPage].uPte.pPae->u; #ifdef VBOX_STRICT /* Check that we've got the right entry. */ RTHCPHYS HCPhysPage = RTR0MemObjGetPagePhysAddr(pSeg->hMemObj, iPage - pSeg->iPage); RTHCPHYS HCPhysPte = pThis->fLegacyMode ? pThis->paPages[iPage].uPte.pLegacy->u & X86_PTE_PG_MASK : pThis->paPages[iPage].uPte.pPae->u & X86_PTE_PAE_PG_MASK; if (HCPhysPage != HCPhysPte) { LogRel(("pgmR0DynMapAddSeg: internal error - page #%u HCPhysPage=%RHp HCPhysPte=%RHp pbPage=%p pvPte=%p\n", iPage - pSeg->iPage, HCPhysPage, HCPhysPte, pbPage, pThis->paPages[iPage].uPte.pv)); rc = VERR_INTERNAL_ERROR; break; } #endif } /* for each page */ ASMIntEnable(); /* cleanup non-PT mappings */ for (uint32_t i = 0; i < PgLvl.cLevels - 1; i++) RTR0MemObjFree(PgLvl.a[i].hMemObj, true /* fFreeMappings */); if (RT_SUCCESS(rc)) { #if PGMR0DYNMAP_GUARD_PAGES > 0 /* * Setup guard pages. * (Note: TLBs will be shot down later on.) */ uint32_t iPage = pSeg->iPage; while (iPage < iEndPage) { for (uint32_t iGPg = 0; iGPg < PGMR0DYNMAP_GUARD_PAGES && iPage < iEndPage; iGPg++, iPage++) pgmR0DynMapSetupGuardPage(pThis, &pThis->paPages[iPage]); iPage++; /* the guarded page */ } /* Make sure the very last page is a guard page too. */ iPage = iEndPage - 1; if (pThis->paPages[iPage].cRefs != PGMR0DYNMAP_GUARD_PAGE_REF_COUNT) pgmR0DynMapSetupGuardPage(pThis, &pThis->paPages[iPage]); #endif /* PGMR0DYNMAP_GUARD_PAGES > 0 */ /* * Commit it by adding the segment to the list and updating the page count. */ pSeg->pNext = pThis->pSegHead; pThis->pSegHead = pSeg; pThis->cPages += cPages; return VINF_SUCCESS; } /* * Bail out. */ while (pSeg->cPTs-- > 0) { rc2 = RTR0MemObjFree(pSeg->ahMemObjPTs[pSeg->cPTs], true /* fFreeMappings */); AssertRC(rc2); pSeg->ahMemObjPTs[pSeg->cPTs] = NIL_RTR0MEMOBJ; } rc2 = RTR0MemObjFree(pSeg->hMemObj, true /* fFreeMappings */); AssertRC(rc2); pSeg->hMemObj = NIL_RTR0MEMOBJ; } RTMemFree(pSeg); /* Don't bother resizing the arrays, but free them if we're the only user. */ if (!pThis->cPages) { RTMemFree(pThis->paPages); pThis->paPages = NULL; RTMemFree(pThis->pvSavedPTEs); pThis->pvSavedPTEs = NULL; } return rc; } /** * Called by PGMR0DynMapInitVM under the init lock. * * @returns VBox status code. * @param pThis The dynamic mapping cache instance. */ static int pgmR0DynMapSetup(PPGMR0DYNMAP pThis) { /* * Calc the size and add a segment of that size. */ uint32_t cMinPages; uint32_t cPages = pgmR0DynMapCalcNewSize(pThis, &cMinPages); AssertReturn(cPages, VERR_INTERNAL_ERROR); int rc = pgmR0DynMapAddSeg(pThis, cPages); if (rc == VERR_NO_MEMORY) { /* * Try adding smaller segments. */ do rc = pgmR0DynMapAddSeg(pThis, PGMR0DYNMAP_SMALL_SEG_PAGES); while (RT_SUCCESS(rc) && pThis->cPages < cPages); if (rc == VERR_NO_MEMORY && pThis->cPages >= cMinPages) rc = VINF_SUCCESS; if (rc == VERR_NO_MEMORY) { if (pThis->cPages) pgmR0DynMapTearDown(pThis); rc = VERR_PGM_DYNMAP_SETUP_ERROR; } } Assert(ASMGetFlags() & X86_EFL_IF); #if PGMR0DYNMAP_GUARD_PAGES > 0 /* paranoia */ if (RT_SUCCESS(rc)) pgmR0DynMapTlbShootDown(pThis); #endif return rc; } /** * Called by PGMR0DynMapInitVM under the init lock. * * @returns VBox status code. * @param pThis The dynamic mapping cache instance. */ static int pgmR0DynMapExpand(PPGMR0DYNMAP pThis) { /* * Calc the new target size and add a segment of the appropriate size. */ uint32_t cMinPages; uint32_t cPages = pgmR0DynMapCalcNewSize(pThis, &cMinPages); AssertReturn(cPages, VERR_INTERNAL_ERROR); if (pThis->cPages >= cPages) return VINF_SUCCESS; uint32_t cAdd = cPages - pThis->cPages; int rc = pgmR0DynMapAddSeg(pThis, cAdd); if (rc == VERR_NO_MEMORY) { /* * Try adding smaller segments. */ do rc = pgmR0DynMapAddSeg(pThis, PGMR0DYNMAP_SMALL_SEG_PAGES); while (RT_SUCCESS(rc) && pThis->cPages < cPages); if (rc == VERR_NO_MEMORY && pThis->cPages >= cMinPages) rc = VINF_SUCCESS; if (rc == VERR_NO_MEMORY) rc = VERR_PGM_DYNMAP_EXPAND_ERROR; } Assert(ASMGetFlags() & X86_EFL_IF); #if PGMR0DYNMAP_GUARD_PAGES > 0 /* paranoia */ if (RT_SUCCESS(rc)) pgmR0DynMapTlbShootDown(pThis); #endif return rc; } /** * Called by PGMR0DynMapTermVM under the init lock. * * @returns VBox status code. * @param pThis The dynamic mapping cache instance. */ static void pgmR0DynMapTearDown(PPGMR0DYNMAP pThis) { /* * Restore the original page table entries */ PPGMR0DYNMAPENTRY paPages = pThis->paPages; uint32_t iPage = pThis->cPages; if (pThis->fLegacyMode) { X86PGUINT const *paSavedPTEs = (X86PGUINT const *)pThis->pvSavedPTEs; while (iPage-- > 0) { X86PGUINT uOld = paPages[iPage].uPte.pLegacy->u; X86PGUINT uOld2 = uOld; NOREF(uOld2); X86PGUINT uNew = paSavedPTEs[iPage]; while (!ASMAtomicCmpXchgExU32(&paPages[iPage].uPte.pLegacy->u, uNew, uOld, &uOld)) AssertMsgFailed(("uOld=%#x uOld2=%#x uNew=%#x\n", uOld, uOld2, uNew)); Assert(paPages[iPage].uPte.pLegacy->u == paSavedPTEs[iPage]); } } else { X86PGPAEUINT const *paSavedPTEs = (X86PGPAEUINT const *)pThis->pvSavedPTEs; while (iPage-- > 0) { X86PGPAEUINT uOld = paPages[iPage].uPte.pPae->u; X86PGPAEUINT uOld2 = uOld; NOREF(uOld2); X86PGPAEUINT uNew = paSavedPTEs[iPage]; while (!ASMAtomicCmpXchgExU64(&paPages[iPage].uPte.pPae->u, uNew, uOld, &uOld)) AssertMsgFailed(("uOld=%#llx uOld2=%#llx uNew=%#llx\n", uOld, uOld2, uNew)); Assert(paPages[iPage].uPte.pPae->u == paSavedPTEs[iPage]); } } /* * Shoot down the TLBs on all CPUs before freeing them. */ pgmR0DynMapTlbShootDown(pThis); /* * Free the segments. */ while (pThis->pSegHead) { int rc; PPGMR0DYNMAPSEG pSeg = pThis->pSegHead; pThis->pSegHead = pSeg->pNext; uint32_t iPT = pSeg->cPTs; while (iPT-- > 0) { rc = RTR0MemObjFree(pSeg->ahMemObjPTs[iPT], true /* fFreeMappings */); AssertRC(rc); pSeg->ahMemObjPTs[iPT] = NIL_RTR0MEMOBJ; } rc = RTR0MemObjFree(pSeg->hMemObj, true /* fFreeMappings */); AssertRC(rc); pSeg->hMemObj = NIL_RTR0MEMOBJ; pSeg->pNext = NULL; pSeg->iPage = UINT16_MAX; pSeg->cPages = 0; pSeg->cPTs = 0; RTMemFree(pSeg); } /* * Free the arrays and restore the initial state. * The cLoadMax value is left behind for the next setup. */ RTMemFree(pThis->paPages); pThis->paPages = NULL; RTMemFree(pThis->pvSavedPTEs); pThis->pvSavedPTEs = NULL; pThis->cPages = 0; pThis->cLoad = 0; pThis->cGuardPages = 0; } /** * Release references to a page, caller owns the spin lock. * * @param pThis The dynamic mapping cache instance. * @param iPage The page. * @param cRefs The number of references to release. */ DECLINLINE(void) pgmR0DynMapReleasePageLocked(PPGMR0DYNMAP pThis, uint32_t iPage, int32_t cRefs) { cRefs = ASMAtomicSubS32(&pThis->paPages[iPage].cRefs, cRefs) - cRefs; AssertMsg(cRefs >= 0, ("%d\n", cRefs)); if (!cRefs) pThis->cLoad--; } /** * Release references to a page, caller does not own the spin lock. * * @param pThis The dynamic mapping cache instance. * @param iPage The page. * @param cRefs The number of references to release. */ static void pgmR0DynMapReleasePage(PPGMR0DYNMAP pThis, uint32_t iPage, uint32_t cRefs) { RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); pgmR0DynMapReleasePageLocked(pThis, iPage, cRefs); RTSpinlockRelease(pThis->hSpinlock, &Tmp); } /** * pgmR0DynMapPage worker that deals with the tedious bits. * * @returns The page index on success, UINT32_MAX on failure. * @param pThis The dynamic mapping cache instance. * @param HCPhys The address of the page to be mapped. * @param iPage The page index pgmR0DynMapPage hashed HCPhys to. * @param pVM The shared VM structure, for statistics only. */ static uint32_t pgmR0DynMapPageSlow(PPGMR0DYNMAP pThis, RTHCPHYS HCPhys, uint32_t iPage, PVM pVM) { #ifdef VBOX_WITH_STATISTICS PVMCPU pVCpu = VMMGetCpu(pVM); #endif STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageSlow); /* * Check if any of the first 3 pages are unreferenced since the caller * already has made sure they aren't matching. */ #ifdef VBOX_WITH_STATISTICS bool fLooped = false; #endif uint32_t const cPages = pThis->cPages; PPGMR0DYNMAPENTRY paPages = pThis->paPages; uint32_t iFreePage; if (!paPages[iPage].cRefs) iFreePage = iPage; else if (!paPages[(iPage + 1) % cPages].cRefs) iFreePage = (iPage + 1) % cPages; else if (!paPages[(iPage + 2) % cPages].cRefs) iFreePage = (iPage + 2) % cPages; else { /* * Search for an unused or matching entry. */ iFreePage = (iPage + 3) % cPages; for (;;) { if (paPages[iFreePage].HCPhys == HCPhys) { STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageSlowLoopHits); return iFreePage; } if (!paPages[iFreePage].cRefs) break; /* advance */ iFreePage = (iFreePage + 1) % cPages; if (RT_UNLIKELY(iFreePage == iPage)) return UINT32_MAX; } STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageSlowLoopMisses); #ifdef VBOX_WITH_STATISTICS fLooped = true; #endif } Assert(iFreePage < cPages); #if 0 //def VBOX_WITH_STATISTICS /* Check for lost hits. */ if (!fLooped) for (uint32_t iPage2 = (iPage + 3) % cPages; iPage2 != iPage; iPage2 = (iPage2 + 1) % cPages) if (paPages[iPage2].HCPhys == HCPhys) STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageSlowLostHits); #endif /* * Setup the new entry. */ /*Log6(("pgmR0DynMapPageSlow: old - %RHp %#x %#llx\n", paPages[iFreePage].HCPhys, paPages[iFreePage].cRefs, paPages[iFreePage].uPte.pPae->u));*/ paPages[iFreePage].HCPhys = HCPhys; RTCpuSetFill(&paPages[iFreePage].PendingSet); if (pThis->fLegacyMode) { X86PGUINT uOld = paPages[iFreePage].uPte.pLegacy->u; X86PGUINT uOld2 = uOld; NOREF(uOld2); X86PGUINT uNew = (uOld & (X86_PTE_G | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT)) | X86_PTE_P | X86_PTE_RW | X86_PTE_A | X86_PTE_D | (HCPhys & X86_PTE_PG_MASK); while (!ASMAtomicCmpXchgExU32(&paPages[iFreePage].uPte.pLegacy->u, uNew, uOld, &uOld)) AssertMsgFailed(("uOld=%#x uOld2=%#x uNew=%#x\n", uOld, uOld2, uNew)); Assert(paPages[iFreePage].uPte.pLegacy->u == uNew); } else { X86PGPAEUINT uOld = paPages[iFreePage].uPte.pPae->u; X86PGPAEUINT uOld2 = uOld; NOREF(uOld2); X86PGPAEUINT uNew = (uOld & (X86_PTE_G | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT)) | X86_PTE_P | X86_PTE_RW | X86_PTE_A | X86_PTE_D | (HCPhys & X86_PTE_PAE_PG_MASK); while (!ASMAtomicCmpXchgExU64(&paPages[iFreePage].uPte.pPae->u, uNew, uOld, &uOld)) AssertMsgFailed(("uOld=%#llx uOld2=%#llx uNew=%#llx\n", uOld, uOld2, uNew)); Assert(paPages[iFreePage].uPte.pPae->u == uNew); /*Log6(("pgmR0DynMapPageSlow: #%x - %RHp %p %#llx\n", iFreePage, HCPhys, paPages[iFreePage].pvPage, uNew));*/ } return iFreePage; } /** * Maps a page into the pool. * * @returns Page index on success, UINT32_MAX on failure. * @param pThis The dynamic mapping cache instance. * @param HCPhys The address of the page to be mapped. * @param iRealCpu The real cpu set index. (optimization) * @param pVM The shared VM structure, for statistics only. * @param ppvPage Where to the page address. */ DECLINLINE(uint32_t) pgmR0DynMapPage(PPGMR0DYNMAP pThis, RTHCPHYS HCPhys, int32_t iRealCpu, PVM pVM, void **ppvPage) { #ifdef VBOX_WITH_STATISTICS PVMCPU pVCpu = VMMGetCpu(pVM); #endif RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); AssertMsg(!(HCPhys & PAGE_OFFSET_MASK), ("HCPhys=%RHp\n", HCPhys)); STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPage); /* * Find an entry, if possible a matching one. The HCPhys address is hashed * down to a page index, collisions are handled by linear searching. * Optimized for a hit in the first 3 pages. * * To the cheap hits here and defer the tedious searching and inserting * to a helper function. */ uint32_t const cPages = pThis->cPages; uint32_t iPage = (HCPhys >> PAGE_SHIFT) % cPages; PPGMR0DYNMAPENTRY paPages = pThis->paPages; if (RT_LIKELY(paPages[iPage].HCPhys == HCPhys)) STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageHits0); else { uint32_t iPage2 = (iPage + 1) % cPages; if (RT_LIKELY(paPages[iPage2].HCPhys == HCPhys)) { iPage = iPage2; STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageHits1); } else { iPage2 = (iPage + 2) % cPages; if (paPages[iPage2].HCPhys == HCPhys) { iPage = iPage2; STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageHits2); } else { iPage = pgmR0DynMapPageSlow(pThis, HCPhys, iPage, pVM); if (RT_UNLIKELY(iPage == UINT32_MAX)) { RTSpinlockRelease(pThis->hSpinlock, &Tmp); *ppvPage = NULL; return iPage; } } } } /* * Reference it, update statistics and get the return address. */ int32_t cRefs = ASMAtomicIncS32(&paPages[iPage].cRefs); if (cRefs == 1) { pThis->cLoad++; if (pThis->cLoad > pThis->cMaxLoad) pThis->cMaxLoad = pThis->cLoad; AssertMsg(pThis->cLoad <= pThis->cPages - pThis->cGuardPages, ("%d/%d\n", pThis->cLoad, pThis->cPages - pThis->cGuardPages)); } else if (RT_UNLIKELY(cRefs <= 0)) { ASMAtomicDecS32(&paPages[iPage].cRefs); RTSpinlockRelease(pThis->hSpinlock, &Tmp); *ppvPage = NULL; AssertLogRelMsgFailedReturn(("cRefs=%d iPage=%p HCPhys=%RHp\n", cRefs, iPage, HCPhys), UINT32_MAX); } void *pvPage = paPages[iPage].pvPage; /* * Invalidate the entry? */ bool fInvalidateIt = RTCpuSetIsMemberByIndex(&paPages[iPage].PendingSet, iRealCpu); if (RT_UNLIKELY(fInvalidateIt)) RTCpuSetDelByIndex(&paPages[iPage].PendingSet, iRealCpu); RTSpinlockRelease(pThis->hSpinlock, &Tmp); /* * Do the actual invalidation outside the spinlock. */ if (RT_UNLIKELY(fInvalidateIt)) { STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapPageInvlPg); ASMInvalidatePage(pvPage); } *ppvPage = pvPage; return iPage; } /** * Assert the the integrity of the pool. * * @returns VBox status code. */ VMMR0DECL(int) PGMR0DynMapAssertIntegrity(void) { /* * Basic pool stuff that doesn't require any lock, just assumes we're a user. */ PPGMR0DYNMAP pThis = g_pPGMR0DynMap; if (!pThis) return VINF_SUCCESS; AssertPtrReturn(pThis, VERR_INVALID_POINTER); AssertReturn(pThis->u32Magic == PGMR0DYNMAP_MAGIC, VERR_INVALID_MAGIC); if (!pThis->cUsers) return VERR_INVALID_PARAMETER; int rc = VINF_SUCCESS; RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); #define CHECK_RET(expr, a) \ do { \ if (RT_UNLIKELY(!(expr))) \ { \ RTSpinlockRelease(pThis->hSpinlock, &Tmp); \ AssertMsg1(#expr, __LINE__, __FILE__, __PRETTY_FUNCTION__); \ AssertMsg2 a; \ return VERR_INTERNAL_ERROR; \ } \ } while (0) /* * Check that the PTEs are correct. */ uint32_t cGuard = 0; uint32_t cLoad = 0; PPGMR0DYNMAPENTRY paPages = pThis->paPages; uint32_t iPage = pThis->cPages; if (pThis->fLegacyMode) { PCX86PGUINT paSavedPTEs = (PCX86PGUINT)pThis->pvSavedPTEs; NOREF(paSavedPTEs); while (iPage-- > 0) { CHECK_RET(!((uintptr_t)paPages[iPage].pvPage & PAGE_OFFSET_MASK), ("#%u: %p\n", iPage, paPages[iPage].pvPage)); if ( paPages[iPage].cRefs == PGMR0DYNMAP_GUARD_PAGE_REF_COUNT && paPages[iPage].HCPhys == PGMR0DYNMAP_GUARD_PAGE_HCPHYS) { #ifdef PGMR0DYNMAP_GUARD_NP CHECK_RET(paPages[iPage].uPte.pLegacy->u == (paSavedPTEs[iPage] & ~(X86PGUINT)X86_PTE_P), ("#%u: %#x %#x", iPage, paPages[iPage].uPte.pLegacy->u, paSavedPTEs[iPage])); #else CHECK_RET(paPages[iPage].uPte.pLegacy->u == PGMR0DYNMAP_GUARD_PAGE_LEGACY_PTE, ("#%u: %#x", iPage, paPages[iPage].uPte.pLegacy->u)); #endif cGuard++; } else if (paPages[iPage].HCPhys != NIL_RTHCPHYS) { CHECK_RET(!(paPages[iPage].HCPhys & PAGE_OFFSET_MASK), ("#%u: %RHp\n", iPage, paPages[iPage].HCPhys)); X86PGUINT uPte = (paSavedPTEs[iPage] & (X86_PTE_G | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT)) | X86_PTE_P | X86_PTE_RW | X86_PTE_A | X86_PTE_D | (paPages[iPage].HCPhys & X86_PTE_PAE_PG_MASK); CHECK_RET(paPages[iPage].uPte.pLegacy->u == uPte, ("#%u: %#x %#x", iPage, paPages[iPage].uPte.pLegacy->u, uPte)); if (paPages[iPage].cRefs) cLoad++; } else CHECK_RET(paPages[iPage].uPte.pLegacy->u == paSavedPTEs[iPage], ("#%u: %#x %#x", iPage, paPages[iPage].uPte.pLegacy->u, paSavedPTEs[iPage])); } } else { PCX86PGPAEUINT paSavedPTEs = (PCX86PGPAEUINT)pThis->pvSavedPTEs; NOREF(paSavedPTEs); while (iPage-- > 0) { CHECK_RET(!((uintptr_t)paPages[iPage].pvPage & PAGE_OFFSET_MASK), ("#%u: %p\n", iPage, paPages[iPage].pvPage)); if ( paPages[iPage].cRefs == PGMR0DYNMAP_GUARD_PAGE_REF_COUNT && paPages[iPage].HCPhys == PGMR0DYNMAP_GUARD_PAGE_HCPHYS) { #ifdef PGMR0DYNMAP_GUARD_NP CHECK_RET(paPages[iPage].uPte.pPae->u == (paSavedPTEs[iPage] & ~(X86PGPAEUINT)X86_PTE_P), ("#%u: %#llx %#llx", iPage, paPages[iPage].uPte.pPae->u, paSavedPTEs[iPage])); #else CHECK_RET(paPages[iPage].uPte.pPae->u == PGMR0DYNMAP_GUARD_PAGE_PAE_PTE, ("#%u: %#llx", iPage, paPages[iPage].uPte.pPae->u)); #endif cGuard++; } else if (paPages[iPage].HCPhys != NIL_RTHCPHYS) { CHECK_RET(!(paPages[iPage].HCPhys & PAGE_OFFSET_MASK), ("#%u: %RHp\n", iPage, paPages[iPage].HCPhys)); X86PGPAEUINT uPte = (paSavedPTEs[iPage] & (X86_PTE_G | X86_PTE_PAT | X86_PTE_PCD | X86_PTE_PWT)) | X86_PTE_P | X86_PTE_RW | X86_PTE_A | X86_PTE_D | (paPages[iPage].HCPhys & X86_PTE_PAE_PG_MASK); CHECK_RET(paPages[iPage].uPte.pPae->u == uPte, ("#%u: %#llx %#llx", iPage, paPages[iPage].uPte.pLegacy->u, uPte)); if (paPages[iPage].cRefs) cLoad++; } else CHECK_RET(paPages[iPage].uPte.pPae->u == paSavedPTEs[iPage], ("#%u: %#llx %#llx", iPage, paPages[iPage].uPte.pPae->u, paSavedPTEs[iPage])); } } CHECK_RET(cLoad == pThis->cLoad, ("%u %u\n", cLoad, pThis->cLoad)); CHECK_RET(cGuard == pThis->cGuardPages, ("%u %u\n", cGuard, pThis->cGuardPages)); #undef CHECK_RET RTSpinlockRelease(pThis->hSpinlock, &Tmp); return VINF_SUCCESS; } /** * Signals the start of a new set of mappings. * * Mostly for strictness. PGMDynMapHCPage won't work unless this * API is called. * * @param pVCpu The shared data for the current virtual CPU. */ VMMDECL(void) PGMDynMapStartAutoSet(PVMCPU pVCpu) { Assert(pVCpu->pgm.s.AutoSet.cEntries == PGMMAPSET_CLOSED); Assert(pVCpu->pgm.s.AutoSet.iSubset == UINT32_MAX); pVCpu->pgm.s.AutoSet.cEntries = 0; pVCpu->pgm.s.AutoSet.iCpu = RTMpCpuIdToSetIndex(RTMpCpuId()); } /** * Worker that performs the actual flushing of the set. * * @param pSet The set to flush. * @param cEntries The number of entries. */ DECLINLINE(void) pgmDynMapFlushAutoSetWorker(PPGMMAPSET pSet, uint32_t cEntries) { /* * Release any pages it's referencing. */ if ( cEntries != 0 && RT_LIKELY(cEntries <= RT_ELEMENTS(pSet->aEntries))) { PPGMR0DYNMAP pThis = g_pPGMR0DynMap; RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); uint32_t i = cEntries; while (i-- > 0) { uint32_t iPage = pSet->aEntries[i].iPage; Assert(iPage < pThis->cPages); int32_t cRefs = pSet->aEntries[i].cRefs; Assert(cRefs > 0); pgmR0DynMapReleasePageLocked(pThis, iPage, cRefs); pSet->aEntries[i].iPage = UINT16_MAX; pSet->aEntries[i].cRefs = 0; } Assert(pThis->cLoad <= pThis->cPages - pThis->cGuardPages); RTSpinlockRelease(pThis->hSpinlock, &Tmp); } } /** * Releases the dynamic memory mappings made by PGMDynMapHCPage and associates * since the PGMDynMapStartAutoSet call. * * @param pVCpu The shared data for the current virtual CPU. */ VMMDECL(void) PGMDynMapReleaseAutoSet(PVMCPU pVCpu) { PPGMMAPSET pSet = &pVCpu->pgm.s.AutoSet; /* * Close and flush the set. */ uint32_t cEntries = pSet->cEntries; AssertReturnVoid(cEntries != PGMMAPSET_CLOSED); pSet->cEntries = PGMMAPSET_CLOSED; pSet->iSubset = UINT32_MAX; pSet->iCpu = -1; STAM_COUNTER_INC(&pVCpu->pgm.s.aStatR0DynMapSetSize[(cEntries * 10 / RT_ELEMENTS(pSet->aEntries)) % 11]); AssertMsg(cEntries < PGMMAPSET_MAX_FILL, ("%u\n", cEntries)); if (cEntries > RT_ELEMENTS(pSet->aEntries) * 50 / 100) Log(("PGMDynMapReleaseAutoSet: cEntries=%d\n", pSet->cEntries)); pgmDynMapFlushAutoSetWorker(pSet, cEntries); } /** * Flushes the set if it's above a certain threshold. * * @param pVCpu The shared data for the current virtual CPU. */ VMMDECL(void) PGMDynMapFlushAutoSet(PVMCPU pVCpu) { PPGMMAPSET pSet = &pVCpu->pgm.s.AutoSet; AssertMsg(pSet->iCpu == RTMpCpuIdToSetIndex(RTMpCpuId()), ("%d %d(%d) efl=%#x\n", pSet->iCpu, RTMpCpuIdToSetIndex(RTMpCpuId()), RTMpCpuId(), ASMGetFlags())); /* * Only flush it if it's 45% full. */ uint32_t cEntries = pSet->cEntries; AssertReturnVoid(cEntries != PGMMAPSET_CLOSED); STAM_COUNTER_INC(&pVCpu->pgm.s.aStatR0DynMapSetSize[(cEntries * 10 / RT_ELEMENTS(pSet->aEntries)) % 11]); if (cEntries >= RT_ELEMENTS(pSet->aEntries) * 45 / 100) { pSet->cEntries = 0; AssertMsg(cEntries < PGMMAPSET_MAX_FILL, ("%u\n", cEntries)); Log(("PGMDynMapFlushAutoSet: cEntries=%d\n", pSet->cEntries)); pgmDynMapFlushAutoSetWorker(pSet, cEntries); AssertMsg(pSet->iCpu == RTMpCpuIdToSetIndex(RTMpCpuId()), ("%d %d(%d) efl=%#x\n", pSet->iCpu, RTMpCpuIdToSetIndex(RTMpCpuId()), RTMpCpuId(), ASMGetFlags())); } } /** * Migrates the automatic mapping set of the current vCPU if it's active and * necessary. * * This is called when re-entering the hardware assisted execution mode after a * nip down to ring-3. We run the risk that the CPU might have change and we * will therefore make sure all the cache entries currently in the auto set will * be valid on the new CPU. If the cpu didn't change nothing will happen as all * the entries will have been flagged as invalidated. * * @param pVCpu The shared data for the current virtual CPU. * @thread EMT */ VMMDECL(void) PGMDynMapMigrateAutoSet(PVMCPU pVCpu) { PPGMMAPSET pSet = &pVCpu->pgm.s.AutoSet; int32_t iRealCpu = RTMpCpuIdToSetIndex(RTMpCpuId()); if (pSet->iCpu != iRealCpu) { uint32_t i = pSet->cEntries; if (i != PGMMAPSET_CLOSED) { AssertMsg(i <= RT_ELEMENTS(pSet->aEntries), ("%#x (%u)\n", i, i)); if (i != 0 && RT_LIKELY(i <= RT_ELEMENTS(pSet->aEntries))) { PPGMR0DYNMAP pThis = g_pPGMR0DynMap; RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); while (i-- > 0) { Assert(pSet->aEntries[i].cRefs > 0); uint32_t iPage = pSet->aEntries[i].iPage; Assert(iPage < pThis->cPages); if (RTCpuSetIsMemberByIndex(&pThis->paPages[iPage].PendingSet, iRealCpu)) { RTCpuSetDelByIndex(&pThis->paPages[iPage].PendingSet, iRealCpu); RTSpinlockRelease(pThis->hSpinlock, &Tmp); ASMInvalidatePage(pThis->paPages[iPage].pvPage); STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapMigrateInvlPg); RTSpinlockAcquire(pThis->hSpinlock, &Tmp); } } RTSpinlockRelease(pThis->hSpinlock, &Tmp); } } pSet->iCpu = iRealCpu; } } /** * Worker function that flushes the current subset. * * This is called when the set is popped or when the set * hash a too high load. As also pointed out elsewhere, the * whole subset thing is a hack for working around code that * accesses too many pages. Like PGMPool. * * @param pSet The set which subset to flush. */ static void pgmDynMapFlushSubset(PPGMMAPSET pSet) { uint32_t iSubset = pSet->iSubset; uint32_t i = pSet->cEntries; Assert(i <= RT_ELEMENTS(pSet->aEntries)); if ( i > iSubset && i <= RT_ELEMENTS(pSet->aEntries)) { Log(("pgmDynMapFlushSubset: cEntries=%d iSubset=%d\n", pSet->cEntries, iSubset)); pSet->cEntries = iSubset; PPGMR0DYNMAP pThis = g_pPGMR0DynMap; RTSPINLOCKTMP Tmp = RTSPINLOCKTMP_INITIALIZER; RTSpinlockAcquire(pThis->hSpinlock, &Tmp); while (i-- > iSubset) { uint32_t iPage = pSet->aEntries[i].iPage; Assert(iPage < pThis->cPages); int32_t cRefs = pSet->aEntries[i].cRefs; Assert(cRefs > 0); pgmR0DynMapReleasePageLocked(pThis, iPage, cRefs); pSet->aEntries[i].iPage = UINT16_MAX; pSet->aEntries[i].cRefs = 0; } RTSpinlockRelease(pThis->hSpinlock, &Tmp); } } /** * Creates a subset. * * A subset is a hack to avoid having to rewrite code that touches a lot of * pages. It prevents the mapping set from being overflowed by automatically * flushing previous mappings when a certain threshold is reached. * * Pages mapped after calling this function are only valid until the next page * is mapped. * * @returns The index of the previous subset. Pass this to * PGMDynMapPopAutoSubset when poping it. * @param pVCpu Pointer to the virtual cpu data. */ VMMDECL(uint32_t) PGMDynMapPushAutoSubset(PVMCPU pVCpu) { PPGMMAPSET pSet = &pVCpu->pgm.s.AutoSet; AssertReturn(pSet->cEntries != PGMMAPSET_CLOSED, UINT32_MAX); uint32_t iPrevSubset = pSet->iSubset; Assert(iPrevSubset == UINT32_MAX); pSet->iSubset = pSet->cEntries; STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapSubsets); return iPrevSubset; } /** * Pops a subset created by a previous call to PGMDynMapPushAutoSubset. * * @param pVCpu Pointer to the virtual cpu data. * @param iPrevSubset What PGMDynMapPushAutoSubset returned. */ VMMDECL(void) PGMDynMapPopAutoSubset(PVMCPU pVCpu, uint32_t iPrevSubset) { PPGMMAPSET pSet = &pVCpu->pgm.s.AutoSet; uint32_t cEntries = pSet->cEntries; AssertReturnVoid(cEntries != PGMMAPSET_CLOSED); AssertReturnVoid(pSet->iSubset <= iPrevSubset || iPrevSubset == UINT32_MAX); Assert(iPrevSubset == UINT32_MAX); STAM_COUNTER_INC(&pVCpu->pgm.s.aStatR0DynMapSetSize[(cEntries * 10 / RT_ELEMENTS(pSet->aEntries)) % 11]); if ( cEntries >= RT_ELEMENTS(pSet->aEntries) * 40 / 100 && cEntries != pSet->iSubset) { AssertMsg(cEntries < PGMMAPSET_MAX_FILL, ("%u\n", cEntries)); pgmDynMapFlushSubset(pSet); } pSet->iSubset = iPrevSubset; } /** * As a final resort for a full auto set, try merge duplicate entries. * * @param pSet The set. */ static void pgmDynMapOptimizeAutoSet(PPGMMAPSET pSet) { for (uint32_t i = 0 ; i < pSet->cEntries; i++) { uint16_t const iPage = pSet->aEntries[i].iPage; uint32_t j = i + 1; while (j < pSet->cEntries) { if (pSet->aEntries[j].iPage != iPage) j++; else if ((uint32_t)pSet->aEntries[i].cRefs + (uint32_t)pSet->aEntries[j].cRefs < UINT16_MAX) { /* merge j into i removing j. */ pSet->aEntries[i].cRefs += pSet->aEntries[j].cRefs; pSet->cEntries--; if (j < pSet->cEntries) { pSet->aEntries[j] = pSet->aEntries[pSet->cEntries]; pSet->aEntries[pSet->cEntries].iPage = UINT16_MAX; pSet->aEntries[pSet->cEntries].cRefs = 0; } else { pSet->aEntries[j].iPage = UINT16_MAX; pSet->aEntries[j].cRefs = 0; } } else { /* migrate the max number of refs from j into i and quit the inner loop. */ uint32_t cMigrate = UINT16_MAX - 1 - pSet->aEntries[i].cRefs; Assert(pSet->aEntries[j].cRefs > cMigrate); pSet->aEntries[j].cRefs -= cMigrate; pSet->aEntries[i].cRefs = UINT16_MAX - 1; break; } } } } /** * Common worker code for PGMDynMapHCPhys, pgmR0DynMapHCPageInlined and * pgmR0DynMapGCPageInlined. * * @returns VINF_SUCCESS, bails out to ring-3 on failure. * @param pVM The shared VM structure (for statistics). * @param pSet The set. * @param HCPhys The physical address of the page. * @param ppv Where to store the address of the mapping on success. * * @remarks This is a very hot path. */ int pgmR0DynMapHCPageCommon(PVM pVM, PPGMMAPSET pSet, RTHCPHYS HCPhys, void **ppv) { #ifdef VBOX_WITH_STATISTICS PVMCPU pVCpu = VMMGetCpu(pVM); #endif AssertMsg(pSet->iCpu == RTMpCpuIdToSetIndex(RTMpCpuId()), ("%d %d(%d) efl=%#x\n", pSet->iCpu, RTMpCpuIdToSetIndex(RTMpCpuId()), RTMpCpuId(), ASMGetFlags())); /* * Map it. */ void *pvPage; uint32_t const iPage = pgmR0DynMapPage(g_pPGMR0DynMap, HCPhys, pSet->iCpu, pVM, &pvPage); if (RT_UNLIKELY(iPage == UINT32_MAX)) { AssertMsg2("PGMDynMapHCPage: cLoad=%u/%u cPages=%u cGuardPages=%u\n", g_pPGMR0DynMap->cLoad, g_pPGMR0DynMap->cMaxLoad, g_pPGMR0DynMap->cPages, g_pPGMR0DynMap->cGuardPages); if (!g_fPGMR0DynMapTestRunning) VMMR0CallHost(pVM, VMMCALLHOST_VM_R0_ASSERTION, 0); *ppv = NULL; return VERR_PGM_DYNMAP_FAILED; } /* * Add the page to the auto reference set. * * The typical usage pattern means that the same pages will be mapped * several times in the same set. We can catch most of these * remappings by looking a few pages back into the set. (The searching * and set optimizing path will hardly ever be used when doing this.) */ AssertCompile(RT_ELEMENTS(pSet->aEntries) >= 8); int32_t i = pSet->cEntries; if (i-- < 5) { unsigned iEntry = pSet->cEntries++; pSet->aEntries[iEntry].cRefs = 1; pSet->aEntries[iEntry].iPage = iPage; pSet->aEntries[iEntry].pvPage = pvPage; pSet->aEntries[iEntry].HCPhys = HCPhys; pSet->aiHashTable[PGMMAPSET_HASH(HCPhys)] = iEntry; } /* Any of the last 5 pages? */ else if ( pSet->aEntries[i - 0].iPage == iPage && pSet->aEntries[i - 0].cRefs < UINT16_MAX - 1) pSet->aEntries[i - 0].cRefs++; else if ( pSet->aEntries[i - 1].iPage == iPage && pSet->aEntries[i - 1].cRefs < UINT16_MAX - 1) pSet->aEntries[i - 1].cRefs++; else if ( pSet->aEntries[i - 2].iPage == iPage && pSet->aEntries[i - 2].cRefs < UINT16_MAX - 1) pSet->aEntries[i - 2].cRefs++; else if ( pSet->aEntries[i - 3].iPage == iPage && pSet->aEntries[i - 3].cRefs < UINT16_MAX - 1) pSet->aEntries[i - 3].cRefs++; else if ( pSet->aEntries[i - 4].iPage == iPage && pSet->aEntries[i - 4].cRefs < UINT16_MAX - 1) pSet->aEntries[i - 4].cRefs++; /* Don't bother searching unless we're above a 60% load. */ else if (RT_LIKELY(i <= (int32_t)RT_ELEMENTS(pSet->aEntries) * 60 / 100)) { unsigned iEntry = pSet->cEntries++; pSet->aEntries[iEntry].cRefs = 1; pSet->aEntries[iEntry].iPage = iPage; pSet->aEntries[iEntry].pvPage = pvPage; pSet->aEntries[iEntry].HCPhys = HCPhys; pSet->aiHashTable[PGMMAPSET_HASH(HCPhys)] = iEntry; } else { /* Search the rest of the set. */ Assert(pSet->cEntries <= RT_ELEMENTS(pSet->aEntries)); i -= 4; while (i-- > 0) if ( pSet->aEntries[i].iPage == iPage && pSet->aEntries[i].cRefs < UINT16_MAX - 1) { pSet->aEntries[i].cRefs++; STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapSetSearchHits); break; } if (i < 0) { STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapSetSearchMisses); if (pSet->iSubset < pSet->cEntries) { STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapSetSearchFlushes); STAM_COUNTER_INC(&pVCpu->pgm.s.aStatR0DynMapSetSize[(pSet->cEntries * 10 / RT_ELEMENTS(pSet->aEntries)) % 11]); AssertMsg(pSet->cEntries < PGMMAPSET_MAX_FILL, ("%u\n", pSet->cEntries)); pgmDynMapFlushSubset(pSet); } if (RT_UNLIKELY(pSet->cEntries >= RT_ELEMENTS(pSet->aEntries))) { STAM_COUNTER_INC(&pVCpu->pgm.s.StatR0DynMapSetOptimize); pgmDynMapOptimizeAutoSet(pSet); } if (RT_LIKELY(pSet->cEntries < RT_ELEMENTS(pSet->aEntries))) { unsigned iEntry = pSet->cEntries++; pSet->aEntries[iEntry].cRefs = 1; pSet->aEntries[iEntry].iPage = iPage; pSet->aEntries[iEntry].pvPage = pvPage; pSet->aEntries[iEntry].HCPhys = HCPhys; pSet->aiHashTable[PGMMAPSET_HASH(HCPhys)] = iEntry; } else { /* We're screwed. */ pgmR0DynMapReleasePage(g_pPGMR0DynMap, iPage, 1); AssertMsg2("PGMDynMapHCPage: set is full!\n"); if (!g_fPGMR0DynMapTestRunning) VMMR0CallHost(pVM, VMMCALLHOST_VM_R0_ASSERTION, 0); *ppv = NULL; return VERR_PGM_DYNMAP_FULL_SET; } } } *ppv = pvPage; return VINF_SUCCESS; } #if 0 /* Not used in R0, should internalized the other PGMDynMapHC/GCPage too. */ /* documented elsewhere - a bit of a mess. */ VMMDECL(int) PGMDynMapHCPage(PVM pVM, RTHCPHYS HCPhys, void **ppv) { #ifdef VBOX_WITH_STATISTICS PVMCPU pVCpu = VMMGetCpu(pVM); #endif /* * Validate state. */ STAM_PROFILE_START(&pVCpu->pgm.s.StatR0DynMapHCPage, a); AssertPtr(ppv); AssertMsg(pVM->pgm.s.pvR0DynMapUsed == g_pPGMR0DynMap, ("%p != %p\n", pVM->pgm.s.pvR0DynMapUsed, g_pPGMR0DynMap)); AssertMsg(!(HCPhys & PAGE_OFFSET_MASK), ("HCPhys=%RHp\n", HCPhys)); PVMCPU pVCpu = VMMGetCpu(pVM); AssertPtr(pVCpu); PPGMMAPSET pSet = &pVCpu->pgm.s.AutoSet; AssertMsg(pSet->cEntries <= RT_ELEMENTS(pSet->aEntries), ("%#x (%u)\n", pSet->cEntries, pSet->cEntries)); /* * Call common code. */ int rc = pgmR0DynMapHCPageCommon(pVM, pSet, HCPhys, ppv); STAM_PROFILE_STOP(&pVCpu->pgm.s.StatR0DynMapHCPage, a); return rc; } #endif #if 0 /*def DEBUG*/ /** For pgmR0DynMapTest3PerCpu. */ typedef struct PGMR0DYNMAPTEST { uint32_t u32Expect; uint32_t *pu32; uint32_t volatile cFailures; } PGMR0DYNMAPTEST; typedef PGMR0DYNMAPTEST *PPGMR0DYNMAPTEST; /** * Checks that the content of the page is the same on all CPUs, i.e. that there * are no CPU specfic PTs or similar nasty stuff involved. * * @param idCpu The current CPU. * @param pvUser1 Pointer a PGMR0DYNMAPTEST structure. * @param pvUser2 Unused, ignored. */ static DECLCALLBACK(void) pgmR0DynMapTest3PerCpu(RTCPUID idCpu, void *pvUser1, void *pvUser2) { PPGMR0DYNMAPTEST pTest = (PPGMR0DYNMAPTEST)pvUser1; ASMInvalidatePage(pTest->pu32); if (*pTest->pu32 != pTest->u32Expect) ASMAtomicIncU32(&pTest->cFailures); NOREF(pvUser2); NOREF(idCpu); } /** * Performs some basic tests in debug builds. */ static int pgmR0DynMapTest(PVM pVM) { LogRel(("pgmR0DynMapTest: ****** START ******\n")); PPGMR0DYNMAP pThis = g_pPGMR0DynMap; PPGMMAPSET pSet = &pVM->aCpus[0].pgm.s.AutoSet; uint32_t i; /* * Assert internal integrity first. */ LogRel(("Test #0\n")); int rc = PGMR0DynMapAssertIntegrity(); if (RT_FAILURE(rc)) return rc; void *pvR0DynMapUsedSaved = pVM->pgm.s.pvR0DynMapUsed; pVM->pgm.s.pvR0DynMapUsed = pThis; g_fPGMR0DynMapTestRunning = true; /* * Simple test, map CR3 twice and check that we're getting the * same mapping address back. */ LogRel(("Test #1\n")); ASMIntDisable(); PGMDynMapStartAutoSet(&pVM->aCpus[0]); uint64_t cr3 = ASMGetCR3() & ~(uint64_t)PAGE_OFFSET_MASK; void *pv = (void *)(intptr_t)-1; void *pv2 = (void *)(intptr_t)-2; rc = PGMDynMapHCPage(pVM, cr3, &pv); int rc2 = PGMDynMapHCPage(pVM, cr3, &pv2); ASMIntEnable(); if ( RT_SUCCESS(rc2) && RT_SUCCESS(rc) && pv == pv2) { LogRel(("Load=%u/%u/%u Set=%u/%u\n", pThis->cLoad, pThis->cMaxLoad, pThis->cPages - pThis->cPages, pSet->cEntries, RT_ELEMENTS(pSet->aEntries))); rc = PGMR0DynMapAssertIntegrity(); /* * Check that the simple set overflow code works by filling it * with more CR3 mappings. */ LogRel(("Test #2\n")); ASMIntDisable(); PGMDynMapMigrateAutoSet(&pVM->aCpus[0]); for (i = 0 ; i < UINT16_MAX*2 - 1 && RT_SUCCESS(rc) && pv2 == pv; i++) { pv2 = (void *)(intptr_t)-4; rc = PGMDynMapHCPage(pVM, cr3, &pv2); } ASMIntEnable(); if (RT_FAILURE(rc) || pv != pv2) { LogRel(("failed(%d): rc=%Rrc; pv=%p pv2=%p i=%p\n", __LINE__, rc, pv, pv2, i)); if (RT_SUCCESS(rc)) rc = VERR_INTERNAL_ERROR; } else if (pSet->cEntries != 5) { LogRel(("failed(%d): cEntries=%d expected %d\n", __LINE__, pSet->cEntries, RT_ELEMENTS(pSet->aEntries) / 2)); rc = VERR_INTERNAL_ERROR; } else if ( pSet->aEntries[4].cRefs != UINT16_MAX - 1 || pSet->aEntries[3].cRefs != UINT16_MAX - 1 || pSet->aEntries[2].cRefs != 1 || pSet->aEntries[1].cRefs != 1 || pSet->aEntries[0].cRefs != 1) { LogRel(("failed(%d): bad set dist: ", __LINE__)); for (i = 0; i < pSet->cEntries; i++) LogRel(("[%d]=%d, ", i, pSet->aEntries[i].cRefs)); LogRel(("\n")); rc = VERR_INTERNAL_ERROR; } if (RT_SUCCESS(rc)) rc = PGMR0DynMapAssertIntegrity(); if (RT_SUCCESS(rc)) { /* * Trigger an set optimization run (exactly). */ LogRel(("Test #3\n")); ASMIntDisable(); PGMDynMapMigrateAutoSet(&pVM->aCpus[0]); pv2 = NULL; for (i = 0 ; i < RT_ELEMENTS(pSet->aEntries) - 5 && RT_SUCCESS(rc) && pv2 != pv; i++) { pv2 = (void *)(intptr_t)(-5 - i); rc = PGMDynMapHCPage(pVM, cr3 + PAGE_SIZE * (i + 5), &pv2); } ASMIntEnable(); if (RT_FAILURE(rc) || pv == pv2) { LogRel(("failed(%d): rc=%Rrc; pv=%p pv2=%p i=%d\n", __LINE__, rc, pv, pv2, i)); if (RT_SUCCESS(rc)) rc = VERR_INTERNAL_ERROR; } else if (pSet->cEntries != RT_ELEMENTS(pSet->aEntries)) { LogRel(("failed(%d): cEntries=%d expected %d\n", __LINE__, pSet->cEntries, RT_ELEMENTS(pSet->aEntries))); rc = VERR_INTERNAL_ERROR; } LogRel(("Load=%u/%u/%u Set=%u/%u\n", pThis->cLoad, pThis->cMaxLoad, pThis->cPages - pThis->cPages, pSet->cEntries, RT_ELEMENTS(pSet->aEntries))); if (RT_SUCCESS(rc)) rc = PGMR0DynMapAssertIntegrity(); if (RT_SUCCESS(rc)) { /* * Trigger an overflow error. */ LogRel(("Test #4\n")); ASMIntDisable(); PGMDynMapMigrateAutoSet(&pVM->aCpus[0]); for (i = 0 ; i < RT_ELEMENTS(pSet->aEntries) + 2; i++) { rc = PGMDynMapHCPage(pVM, cr3 - PAGE_SIZE * (i + 5), &pv2); if (RT_SUCCESS(rc)) rc = PGMR0DynMapAssertIntegrity(); if (RT_FAILURE(rc)) break; } ASMIntEnable(); if (rc == VERR_PGM_DYNMAP_FULL_SET) { /* flush the set. */ LogRel(("Test #5\n")); ASMIntDisable(); PGMDynMapMigrateAutoSet(&pVM->aCpus[0]); PGMDynMapReleaseAutoSet(&pVM->aCpus[0]); PGMDynMapStartAutoSet(&pVM->aCpus[0]); ASMIntEnable(); rc = PGMR0DynMapAssertIntegrity(); } else { LogRel(("failed(%d): rc=%Rrc, wanted %d ; pv2=%p Set=%u/%u; i=%d\n", __LINE__, rc, VERR_PGM_DYNMAP_FULL_SET, pv2, pSet->cEntries, RT_ELEMENTS(pSet->aEntries), i)); if (RT_SUCCESS(rc)) rc = VERR_INTERNAL_ERROR; } } } } else { LogRel(("failed(%d): rc=%Rrc rc2=%Rrc; pv=%p pv2=%p\n", __LINE__, rc, rc2, pv, pv2)); if (RT_SUCCESS(rc)) rc = rc2; } /* * Check that everyone sees the same stuff. */ if (RT_SUCCESS(rc)) { LogRel(("Test #5\n")); ASMIntDisable(); PGMDynMapMigrateAutoSet(&pVM->aCpus[0]); RTHCPHYS HCPhysPT = RTR0MemObjGetPagePhysAddr(pThis->pSegHead->ahMemObjPTs[0], 0); rc = PGMDynMapHCPage(pVM, HCPhysPT, &pv); if (RT_SUCCESS(rc)) { PGMR0DYNMAPTEST Test; uint32_t *pu32Real = &pThis->paPages[pThis->pSegHead->iPage].uPte.pLegacy->u; Test.pu32 = (uint32_t *)((uintptr_t)pv | ((uintptr_t)pu32Real & PAGE_OFFSET_MASK)); Test.u32Expect = *pu32Real; ASMAtomicWriteU32(&Test.cFailures, 0); ASMIntEnable(); rc = RTMpOnAll(pgmR0DynMapTest3PerCpu, &Test, NULL); if (RT_FAILURE(rc)) LogRel(("failed(%d): RTMpOnAll rc=%Rrc\n", __LINE__, rc)); else if (Test.cFailures) { LogRel(("failed(%d): cFailures=%d pu32Real=%p pu32=%p u32Expect=%#x *pu32=%#x\n", __LINE__, Test.cFailures, pu32Real, Test.pu32, Test.u32Expect, *Test.pu32)); rc = VERR_INTERNAL_ERROR; } else LogRel(("pu32Real=%p pu32=%p u32Expect=%#x *pu32=%#x\n", pu32Real, Test.pu32, Test.u32Expect, *Test.pu32)); } else { ASMIntEnable(); LogRel(("failed(%d): rc=%Rrc\n", rc)); } } /* * Clean up. */ LogRel(("Cleanup.\n")); ASMIntDisable(); PGMDynMapMigrateAutoSet(&pVM->aCpus[0]); PGMDynMapFlushAutoSet(&pVM->aCpus[0]); PGMDynMapReleaseAutoSet(&pVM->aCpus[0]); ASMIntEnable(); if (RT_SUCCESS(rc)) rc = PGMR0DynMapAssertIntegrity(); else PGMR0DynMapAssertIntegrity(); g_fPGMR0DynMapTestRunning = false; LogRel(("Result: rc=%Rrc Load=%u/%u/%u Set=%#x/%u\n", rc, pThis->cLoad, pThis->cMaxLoad, pThis->cPages - pThis->cPages, pSet->cEntries, RT_ELEMENTS(pSet->aEntries))); pVM->pgm.s.pvR0DynMapUsed = pvR0DynMapUsedSaved; LogRel(("pgmR0DynMapTest: ****** END ******\n")); return rc; } #endif /* DEBUG */