VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMR0/PGMR0SharedPage.cpp

Last change on this file was 106061, checked in by vboxsync, 3 months ago

Copyright year updates by scm.

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1/* $Id: PGMR0SharedPage.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2/** @file
3 * PGM - Page Manager and Monitor, Page Sharing, Ring-0.
4 */
5
6/*
7 * Copyright (C) 2010-2024 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * SPDX-License-Identifier: GPL-3.0-only
26 */
27
28
29/*********************************************************************************************************************************
30* Header Files *
31*********************************************************************************************************************************/
32#define LOG_GROUP LOG_GROUP_PGM_SHARED
33#define VBOX_WITHOUT_PAGING_BIT_FIELDS /* 64-bit bitfields are just asking for trouble. See @bugref{9841} and others. */
34#include <VBox/vmm/pgm.h>
35#include <VBox/vmm/iem.h>
36#include <VBox/vmm/gmm.h>
37#include "PGMInternal.h"
38#include <VBox/vmm/vmcc.h>
39#include <VBox/vmm/gvm.h>
40#include "PGMInline.h"
41#include <VBox/log.h>
42#include <VBox/err.h>
43#include <iprt/assert.h>
44#include <iprt/mem.h>
45
46
47#ifdef VBOX_WITH_PAGE_SHARING
48/**
49 * Check a registered module for shared page changes.
50 *
51 * The PGM lock shall be taken prior to calling this method.
52 *
53 * @returns The following VBox status codes.
54 *
55 * @param pVM The cross context VM structure.
56 * @param pGVM Pointer to the GVM instance data.
57 * @param idCpu The ID of the calling virtual CPU.
58 * @param pModule Global module description.
59 * @param paRegionsGCPtrs Array parallel to pModules->aRegions with the
60 * addresses of the regions in the calling
61 * process.
62 */
63VMMR0DECL(int) PGMR0SharedModuleCheck(PVMCC pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PCRTGCPTR64 paRegionsGCPtrs)
64{
65 PVMCPUCC pVCpu = &pGVM->aCpus[idCpu];
66 int rc = VINF_SUCCESS;
67 bool fFlushTLBs = false;
68 bool fFlushRemTLBs = false;
69 GMMSHAREDPAGEDESC PageDesc;
70
71 Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
72
73 PGM_LOCK_ASSERT_OWNER(pVM); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
74
75 /*
76 * Check every region of the shared module.
77 */
78 for (uint32_t idxRegion = 0; idxRegion < pModule->cRegions; idxRegion++)
79 {
80 RTGCPTR GCPtrPage = paRegionsGCPtrs[idxRegion] & ~(RTGCPTR)GUEST_PAGE_OFFSET_MASK;
81 uint32_t cbLeft = pModule->aRegions[idxRegion].cb; Assert(!(cbLeft & GUEST_PAGE_OFFSET_MASK));
82 uint32_t idxPage = 0;
83
84 while (cbLeft)
85 {
86 /** @todo inefficient to fetch each guest page like this... */
87 PGMPTWALK Walk;
88 rc = PGMGstGetPage(pVCpu, GCPtrPage, &Walk);
89 if ( rc == VINF_SUCCESS
90 && !(Walk.fEffective & X86_PTE_RW)) /* important as we make assumptions about this below! */
91 {
92 PPGMPAGE pPage = pgmPhysGetPage(pVM, Walk.GCPhys);
93 Assert(!pPage || !PGM_PAGE_IS_BALLOONED(pPage));
94 if ( pPage
95 && PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
96 && PGM_PAGE_GET_READ_LOCKS(pPage) == 0
97 && PGM_PAGE_GET_WRITE_LOCKS(pPage) == 0 )
98 {
99 PageDesc.idPage = PGM_PAGE_GET_PAGEID(pPage);
100 PageDesc.HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
101 PageDesc.GCPhys = Walk.GCPhys;
102
103 rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
104 if (RT_FAILURE(rc))
105 break;
106
107 /*
108 * Any change for this page?
109 */
110 if (PageDesc.idPage != NIL_GMM_PAGEID)
111 {
112 Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
113
114 Log(("PGMR0SharedModuleCheck: shared page gst virt=%RGv phys=%RGp host %RHp->%RHp\n",
115 GCPtrPage, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
116
117 /* Page was either replaced by an existing shared
118 version of it or converted into a read-only shared
119 page, so, clear all references. */
120 bool fFlush = false;
121 rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
122 Assert( rc == VINF_SUCCESS
123 || ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)
124 && (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
125 if (rc == VINF_SUCCESS)
126 fFlushTLBs |= fFlush;
127 fFlushRemTLBs = true;
128
129 if (PageDesc.HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
130 {
131 /* Update the physical address and page id now. */
132 PGM_PAGE_SET_HCPHYS(pVM, pPage, PageDesc.HCPhys);
133 PGM_PAGE_SET_PAGEID(pVM, pPage, PageDesc.idPage);
134
135 /* Invalidate page map TLB entry for this page too. */
136 pgmPhysInvalidatePageMapTLBEntry(pVM, PageDesc.GCPhys);
137 IEMTlbInvalidateAllPhysicalAllCpus(pVM, NIL_VMCPUID, IEMTLBPHYSFLUSHREASON_SHARED);
138 pVM->pgm.s.cReusedSharedPages++;
139 }
140 /* else: nothing changed (== this page is now a shared
141 page), so no need to flush anything. */
142
143 pVM->pgm.s.cSharedPages++;
144 pVM->pgm.s.cPrivatePages--;
145 PGM_PAGE_SET_STATE(pVM, pPage, PGM_PAGE_STATE_SHARED);
146
147# ifdef VBOX_STRICT /* check sum hack */
148 pPage->s.u2Unused0 = PageDesc.u32StrictChecksum & 3;
149 //pPage->s.u2Unused1 = (PageDesc.u32StrictChecksum >> 8) & 3;
150# endif
151 }
152 }
153 }
154 else
155 {
156 Assert( rc == VINF_SUCCESS
157 || rc == VERR_PAGE_NOT_PRESENT
158 || rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
159 || rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
160 || rc == VERR_PAGE_TABLE_NOT_PRESENT);
161 rc = VINF_SUCCESS; /* ignore error */
162 }
163
164 idxPage++;
165 GCPtrPage += HOST_PAGE_SIZE;
166 cbLeft -= HOST_PAGE_SIZE;
167 }
168 }
169
170 /*
171 * Do TLB flushing if necessary.
172 */
173 if (fFlushTLBs)
174 PGM_INVL_ALL_VCPU_TLBS(pVM);
175
176 if (fFlushRemTLBs)
177 for (VMCPUID idCurCpu = 0; idCurCpu < pGVM->cCpus; idCurCpu++)
178 CPUMSetChangedFlags(&pGVM->aCpus[idCurCpu], CPUM_CHANGED_GLOBAL_TLB_FLUSH);
179
180 return rc;
181}
182#endif /* VBOX_WITH_PAGE_SHARING */
183
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