diff options
Diffstat (limited to 'src/VBox/VMM/VMMR0/PGMR0SharedPage.cpp')
| -rw-r--r-- | src/VBox/VMM/VMMR0/PGMR0SharedPage.cpp | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/src/VBox/VMM/VMMR0/PGMR0SharedPage.cpp b/src/VBox/VMM/VMMR0/PGMR0SharedPage.cpp new file mode 100644 index 000000000..c6424dc08 --- /dev/null +++ b/src/VBox/VMM/VMMR0/PGMR0SharedPage.cpp @@ -0,0 +1,181 @@ +/* $Id: PGMR0.cpp 61539 2010-05-12 15:11:09Z sandervl $ */
+/** @file
+ * PGM - Page Manager and Monitor, Ring-0.
+ */
+
+/*
+ * Copyright (C) 2007 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_PGM_SHARED
+#include <VBox/pgm.h>
+#include <VBox/gmm.h>
+#include "../PGMInternal.h"
+#include <VBox/vm.h>
+#include "../PGMInline.h"
+#include <VBox/log.h>
+#include <VBox/err.h>
+#include <iprt/assert.h>
+#include <iprt/mem.h>
+
+
+#ifdef VBOX_WITH_PAGE_SHARING
+/**
+ * Check a registered module for shared page changes
+ *
+ * @returns The following VBox status codes.
+ *
+ * @param pVM The VM handle.
+ * @param idCpu VCPU id
+ * @param pModule Module description
+ * @param pGVM Pointer to the GVM instance data.
+ */
+VMMR0DECL(int) PGMR0SharedModuleCheckRegion(PVM pVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PGVM pGVM)
+{
+ int rc = VINF_SUCCESS;
+ PGMMSHAREDPAGEDESC paPageDesc = NULL;
+ uint32_t cbPreviousRegion = 0;
+ bool fFlushTLBs = false;
+ PVMCPU pVCpu = &pVM->aCpus[idCpu];
+
+ Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
+
+ pgmLock(pVM);
+
+ /* Check every region of the shared module. */
+ for (unsigned idxModule = 0; idxModule < pModule->cRegions; idxModule++)
+ {
+ Assert((pModule->aRegions[idxModule].cbRegion & 0xfff) == 0);
+ Assert((pModule->aRegions[idxModule].GCRegionAddr & 0xfff) == 0);
+
+ RTGCPTR GCRegion = pModule->aRegions[idxModule].GCRegionAddr;
+ unsigned cbRegion = pModule->aRegions[idxModule].cbRegion & ~0xfff;
+ unsigned idxPage = 0;
+ bool fValidChanges = false;
+
+ if (cbPreviousRegion < cbRegion)
+ {
+ if (paPageDesc)
+ RTMemFree(paPageDesc);
+
+ paPageDesc = (PGMMSHAREDPAGEDESC)RTMemAlloc((cbRegion >> PAGE_SHIFT) * sizeof(*paPageDesc));
+ if (!paPageDesc)
+ {
+ AssertFailed();
+ rc = VERR_NO_MEMORY;
+ goto end;
+ }
+ cbPreviousRegion = cbRegion;
+ }
+
+ while (cbRegion)
+ {
+ RTGCPHYS GCPhys;
+ uint64_t fFlags;
+
+ rc = PGMGstGetPage(pVCpu, GCRegion, &fFlags, &GCPhys);
+ if ( rc == VINF_SUCCESS
+ && !(fFlags & X86_PTE_RW)) /* important as we make assumptions about this below! */
+ {
+ PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, GCPhys);
+ if ( pPage
+ && !PGM_PAGE_IS_SHARED(pPage))
+ {
+ fValidChanges = true;
+ paPageDesc[idxPage].uHCPhysPageId = PGM_PAGE_GET_PAGEID(pPage);
+ paPageDesc[idxPage].HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
+ paPageDesc[idxPage].GCPhys = GCPhys;
+ }
+ else
+ paPageDesc[idxPage].uHCPhysPageId = NIL_GMM_PAGEID;
+ }
+ else
+ paPageDesc[idxPage].uHCPhysPageId = NIL_GMM_PAGEID;
+
+ idxPage++;
+ GCRegion += PAGE_SIZE;
+ cbRegion -= PAGE_SIZE;
+ }
+
+ if (fValidChanges)
+ {
+ rc = GMMR0SharedModuleCheckRange(pGVM, pModule, idxModule, idxPage, paPageDesc);
+ AssertRC(rc);
+ if (RT_FAILURE(rc))
+ break;
+
+ for (unsigned i = 0; i < idxPage; i++)
+ {
+ /* Any change for this page? */
+ if (paPageDesc[i].uHCPhysPageId != NIL_GMM_PAGEID)
+ {
+ /** todo: maybe cache these to prevent the nth lookup. */
+ PPGMPAGE pPage = pgmPhysGetPage(&pVM->pgm.s, paPageDesc[i].GCPhys);
+ if (!pPage)
+ {
+ /* Should never happen. */
+ AssertFailed();
+ rc = VERR_PGM_PHYS_INVALID_PAGE_ID;
+ goto end;
+ }
+ Assert(!PGM_PAGE_IS_SHARED(pPage));
+
+ Log(("PGMR0SharedModuleCheck: shared page gc virt=%RGv phys %RGp host %RHp->%RHp\n", pModule->aRegions[idxModule].GCRegionAddr + i * PAGE_SIZE, paPageDesc[i].GCPhys, PGM_PAGE_GET_HCPHYS(pPage), paPageDesc[i].HCPhys));
+ if (paPageDesc[i].HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
+ {
+ bool fFlush = false;
+
+ /* Page was replaced by an existing shared version of it; clear all references first. */
+ rc = pgmPoolTrackUpdateGCPhys(pVM, paPageDesc[i].GCPhys, pPage, true /* clear the entries */, &fFlush);
+ if (RT_FAILURE(rc))
+ {
+ AssertRC(rc);
+ goto end;
+ }
+ Assert(rc == VINF_SUCCESS || (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_PGM_SYNC_CR3) && (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
+ if (rc == VINF_SUCCESS)
+ fFlushTLBs |= fFlush;
+
+ /* Update the physical address and page id now. */
+ PGM_PAGE_SET_HCPHYS(pPage, paPageDesc[i].HCPhys);
+ PGM_PAGE_SET_PAGEID(pPage, paPageDesc[i].uHCPhysPageId);
+
+ /* Invalidate page map TLB entry for this page too. */
+ PGMPhysInvalidatePageMapTLBEntry(pVM, paPageDesc[i].GCPhys);
+ pVM->pgm.s.cReusedSharedPages++;
+ }
+ /* else nothing changed (== this page is now a shared page), so no need to flush anything. */
+
+ pVM->pgm.s.cSharedPages++;
+ pVM->pgm.s.cPrivatePages--;
+ PGM_PAGE_SET_STATE(pPage, PGM_PAGE_STATE_SHARED);
+ }
+ }
+ }
+ else
+ rc = VINF_SUCCESS; /* nothing to do. */
+ }
+
+end:
+ pgmUnlock(pVM);
+ if (fFlushTLBs)
+ PGM_INVL_ALL_VCPU_TLBS(pVM);
+
+ if (paPageDesc)
+ RTMemFree(paPageDesc);
+
+ return rc;
+}
+#endif
+
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