| 1 | /* $Id: PGMR0SharedPage.cpp 56287 2015-06-09 11:15:22Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * PGM - Page Manager and Monitor, Page Sharing, Ring-0.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2010-2015 Oracle Corporation
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 | /*******************************************************************************
|
|---|
| 19 | * Header Files *
|
|---|
| 20 | *******************************************************************************/
|
|---|
| 21 | #define LOG_GROUP LOG_GROUP_PGM_SHARED
|
|---|
| 22 | #include <VBox/vmm/pgm.h>
|
|---|
| 23 | #include <VBox/vmm/gmm.h>
|
|---|
| 24 | #include "PGMInternal.h"
|
|---|
| 25 | #include <VBox/vmm/vm.h>
|
|---|
| 26 | #include "PGMInline.h"
|
|---|
| 27 | #include <VBox/log.h>
|
|---|
| 28 | #include <VBox/err.h>
|
|---|
| 29 | #include <iprt/assert.h>
|
|---|
| 30 | #include <iprt/mem.h>
|
|---|
| 31 |
|
|---|
| 32 |
|
|---|
| 33 | #ifdef VBOX_WITH_PAGE_SHARING
|
|---|
| 34 | /**
|
|---|
| 35 | * Check a registered module for shared page changes.
|
|---|
| 36 | *
|
|---|
| 37 | * The PGM lock shall be taken prior to calling this method.
|
|---|
| 38 | *
|
|---|
| 39 | * @returns The following VBox status codes.
|
|---|
| 40 | *
|
|---|
| 41 | * @param pVM Pointer to the VM.
|
|---|
| 42 | * @param pGVM Pointer to the GVM instance data.
|
|---|
| 43 | * @param idCpu The ID of the calling virtual CPU.
|
|---|
| 44 | * @param pModule Global module description.
|
|---|
| 45 | * @param paRegionsGCPtrs Array parallel to pModules->aRegions with the
|
|---|
| 46 | * addresses of the regions in the calling
|
|---|
| 47 | * process.
|
|---|
| 48 | */
|
|---|
| 49 | VMMR0DECL(int) PGMR0SharedModuleCheck(PVM pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PCRTGCPTR64 paRegionsGCPtrs)
|
|---|
| 50 | {
|
|---|
| 51 | PVMCPU pVCpu = &pVM->aCpus[idCpu];
|
|---|
| 52 | int rc = VINF_SUCCESS;
|
|---|
| 53 | bool fFlushTLBs = false;
|
|---|
| 54 | bool fFlushRemTLBs = false;
|
|---|
| 55 | GMMSHAREDPAGEDESC PageDesc;
|
|---|
| 56 |
|
|---|
| 57 | Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
|
|---|
| 58 |
|
|---|
| 59 | PGM_LOCK_ASSERT_OWNER(pVM); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
|
|---|
| 60 |
|
|---|
| 61 | /*
|
|---|
| 62 | * Check every region of the shared module.
|
|---|
| 63 | */
|
|---|
| 64 | for (uint32_t idxRegion = 0; idxRegion < pModule->cRegions; idxRegion++)
|
|---|
| 65 | {
|
|---|
| 66 | RTGCPTR GCPtrPage = paRegionsGCPtrs[idxRegion] & ~(RTGCPTR)PAGE_OFFSET_MASK;
|
|---|
| 67 | uint32_t cbLeft = pModule->aRegions[idxRegion].cb; Assert(!(cbLeft & PAGE_OFFSET_MASK));
|
|---|
| 68 | uint32_t idxPage = 0;
|
|---|
| 69 |
|
|---|
| 70 | while (cbLeft)
|
|---|
| 71 | {
|
|---|
| 72 | /** @todo inefficient to fetch each guest page like this... */
|
|---|
| 73 | RTGCPHYS GCPhys;
|
|---|
| 74 | uint64_t fFlags;
|
|---|
| 75 | rc = PGMGstGetPage(pVCpu, GCPtrPage, &fFlags, &GCPhys);
|
|---|
| 76 | if ( rc == VINF_SUCCESS
|
|---|
| 77 | && !(fFlags & X86_PTE_RW)) /* important as we make assumptions about this below! */
|
|---|
| 78 | {
|
|---|
| 79 | PPGMPAGE pPage = pgmPhysGetPage(pVM, GCPhys);
|
|---|
| 80 | Assert(!pPage || !PGM_PAGE_IS_BALLOONED(pPage));
|
|---|
| 81 | if ( pPage
|
|---|
| 82 | && PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
|
|---|
| 83 | && PGM_PAGE_GET_READ_LOCKS(pPage) == 0
|
|---|
| 84 | && PGM_PAGE_GET_WRITE_LOCKS(pPage) == 0 )
|
|---|
| 85 | {
|
|---|
| 86 | PageDesc.idPage = PGM_PAGE_GET_PAGEID(pPage);
|
|---|
| 87 | PageDesc.HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
|
|---|
| 88 | PageDesc.GCPhys = GCPhys;
|
|---|
| 89 |
|
|---|
| 90 | rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
|
|---|
| 91 | if (RT_FAILURE(rc))
|
|---|
| 92 | break;
|
|---|
| 93 |
|
|---|
| 94 | /*
|
|---|
| 95 | * Any change for this page?
|
|---|
| 96 | */
|
|---|
| 97 | if (PageDesc.idPage != NIL_GMM_PAGEID)
|
|---|
| 98 | {
|
|---|
| 99 | Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
|
|---|
| 100 |
|
|---|
| 101 | Log(("PGMR0SharedModuleCheck: shared page gst virt=%RGv phys=%RGp host %RHp->%RHp\n",
|
|---|
| 102 | GCPtrPage, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
|
|---|
| 103 |
|
|---|
| 104 | /* Page was either replaced by an existing shared
|
|---|
| 105 | version of it or converted into a read-only shared
|
|---|
| 106 | page, so, clear all references. */
|
|---|
| 107 | bool fFlush = false;
|
|---|
| 108 | rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
|
|---|
| 109 | Assert( rc == VINF_SUCCESS
|
|---|
| 110 | || ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)
|
|---|
| 111 | && (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
|
|---|
| 112 | if (rc == VINF_SUCCESS)
|
|---|
| 113 | fFlushTLBs |= fFlush;
|
|---|
| 114 | fFlushRemTLBs = true;
|
|---|
| 115 |
|
|---|
| 116 | if (PageDesc.HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
|
|---|
| 117 | {
|
|---|
| 118 | /* Update the physical address and page id now. */
|
|---|
| 119 | PGM_PAGE_SET_HCPHYS(pVM, pPage, PageDesc.HCPhys);
|
|---|
| 120 | PGM_PAGE_SET_PAGEID(pVM, pPage, PageDesc.idPage);
|
|---|
| 121 |
|
|---|
| 122 | /* Invalidate page map TLB entry for this page too. */
|
|---|
| 123 | pgmPhysInvalidatePageMapTLBEntry(pVM, PageDesc.GCPhys);
|
|---|
| 124 | pVM->pgm.s.cReusedSharedPages++;
|
|---|
| 125 | }
|
|---|
| 126 | /* else: nothing changed (== this page is now a shared
|
|---|
| 127 | page), so no need to flush anything. */
|
|---|
| 128 |
|
|---|
| 129 | pVM->pgm.s.cSharedPages++;
|
|---|
| 130 | pVM->pgm.s.cPrivatePages--;
|
|---|
| 131 | PGM_PAGE_SET_STATE(pVM, pPage, PGM_PAGE_STATE_SHARED);
|
|---|
| 132 |
|
|---|
| 133 | # ifdef VBOX_STRICT /* check sum hack */
|
|---|
| 134 | pPage->s.u2Unused0 = PageDesc.u32StrictChecksum & 3;
|
|---|
| 135 | pPage->s.u2Unused1 = (PageDesc.u32StrictChecksum >> 8) & 3;
|
|---|
| 136 | # endif
|
|---|
| 137 | }
|
|---|
| 138 | }
|
|---|
| 139 | }
|
|---|
| 140 | else
|
|---|
| 141 | {
|
|---|
| 142 | Assert( rc == VINF_SUCCESS
|
|---|
| 143 | || rc == VERR_PAGE_NOT_PRESENT
|
|---|
| 144 | || rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
|
|---|
| 145 | || rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
|
|---|
| 146 | || rc == VERR_PAGE_TABLE_NOT_PRESENT);
|
|---|
| 147 | rc = VINF_SUCCESS; /* ignore error */
|
|---|
| 148 | }
|
|---|
| 149 |
|
|---|
| 150 | idxPage++;
|
|---|
| 151 | GCPtrPage += PAGE_SIZE;
|
|---|
| 152 | cbLeft -= PAGE_SIZE;
|
|---|
| 153 | }
|
|---|
| 154 | }
|
|---|
| 155 |
|
|---|
| 156 | /*
|
|---|
| 157 | * Do TLB flushing if necessary.
|
|---|
| 158 | */
|
|---|
| 159 | if (fFlushTLBs)
|
|---|
| 160 | PGM_INVL_ALL_VCPU_TLBS(pVM);
|
|---|
| 161 |
|
|---|
| 162 | if (fFlushRemTLBs)
|
|---|
| 163 | for (VMCPUID idCurCpu = 0; idCurCpu < pVM->cCpus; idCurCpu++)
|
|---|
| 164 | CPUMSetChangedFlags(&pVM->aCpus[idCurCpu], CPUM_CHANGED_GLOBAL_TLB_FLUSH);
|
|---|
| 165 |
|
|---|
| 166 | return rc;
|
|---|
| 167 | }
|
|---|
| 168 | #endif /* VBOX_WITH_PAGE_SHARING */
|
|---|
| 169 |
|
|---|
