PGMR0SharedPage.cpp revision 67b4b089c50d0ab8ad847dddd8c0e0812fdadc9e
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * PGM - Page Manager and Monitor, Page Sharing, Ring-0.
c58f1213e628a545081c70e26c6b67a841cff880vboxsync * Copyright (C) 2010-2012 Oracle Corporation
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * available from http://www.virtualbox.org. This file is free software;
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * you can redistribute it and/or modify it under the terms of the GNU
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * General Public License (GPL) as published by the Free Software
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync/*******************************************************************************
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync* Header Files *
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync*******************************************************************************/
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Check a registered module for shared page changes.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * The PGM lock shall be taken prior to calling this method.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * @returns The following VBox status codes.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * @param pVM Pointer to the VM.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * @param pGVM Pointer to the GVM instance data.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * @param idCpu The ID of the calling virtual CPU.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * @param pModule Global module description.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * @param paRegionsGCPtrs Array parallel to pModules->aRegions with the
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * addresses of the regions in the calling
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsyncVMMR0DECL(int) PGMR0SharedModuleCheck(PVM pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PCRTGCPTR64 paRegionsGCPtrs)
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync bool fFlushTLBs = false;
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync PGM_LOCK_ASSERT_OWNER(pVM); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Check every region of the shared module.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync for (uint32_t idxRegion = 0; idxRegion < pModule->cRegions; idxRegion++)
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync RTGCPTR GCPtrPage = paRegionsGCPtrs[idxRegion] & ~(RTGCPTR)PAGE_OFFSET_MASK;
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync uint32_t cbLeft = pModule->aRegions[idxRegion].cb; Assert(!(cbLeft & PAGE_OFFSET_MASK));
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync /** @todo inefficient to fetch each guest page like this... */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync rc = PGMGstGetPage(pVCpu, GCPtrPage, &fFlags, &GCPhys);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync && !(fFlags & X86_PTE_RW)) /* important as we make assumptions about this below! */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync && PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Any change for this page?
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync Log(("PGMR0SharedModuleCheck: shared page gst virt=%RGv phys=%RGp host %RHp->%RHp\n",
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync GCPtrPage, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync /* Page was replaced by an existing shared version
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync of it; clear all references first. */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync bool fFlush = false;
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync && (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync /* Update the physical address and page id now. */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync /* Invalidate page map TLB entry for this page too. */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync pgmPhysInvalidatePageMapTLBEntry(pVM, PageDesc.GCPhys);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync /* else: nothing changed (== this page is now a shared
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync page), so no need to flush anything. */
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync PGM_PAGE_SET_STATE(pVM, pPage, PGM_PAGE_STATE_SHARED);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync * Do TLB flushing if necessary.
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync for (VMCPUID idCurCpu = 0; idCurCpu < pVM->cCpus; idCurCpu++)
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync CPUMSetChangedFlags(&pVM->aCpus[idCurCpu], CPUM_CHANGED_GLOBAL_TLB_FLUSH);
0b74a2f80aba476dc8be8bc1c63891fc53945986vboxsync#endif /* VBOX_WITH_PAGE_SHARING */