1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/* $Id: PGMR0SharedPage.cpp $ */
/** @file
* PGM - Page Manager and Monitor, Page Sharing, Ring-0.
*/
/*
* Copyright (C) 2010-2020 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/vmm/pgm.h>
#include <VBox/vmm/gmm.h>
#include "PGMInternal.h"
#include <VBox/vmm/vmcc.h>
#include <VBox/vmm/gvm.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.
*
* The PGM lock shall be taken prior to calling this method.
*
* @returns The following VBox status codes.
*
* @param pVM The cross context VM structure.
* @param pGVM Pointer to the GVM instance data.
* @param idCpu The ID of the calling virtual CPU.
* @param pModule Global module description.
* @param paRegionsGCPtrs Array parallel to pModules->aRegions with the
* addresses of the regions in the calling
* process.
*/
VMMR0DECL(int) PGMR0SharedModuleCheck(PVMCC pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PCRTGCPTR64 paRegionsGCPtrs)
{
PVMCPUCC pVCpu = &pGVM->aCpus[idCpu];
int rc = VINF_SUCCESS;
bool fFlushTLBs = false;
bool fFlushRemTLBs = false;
GMMSHAREDPAGEDESC PageDesc;
Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
PGM_LOCK_ASSERT_OWNER(pVM); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
/*
* Check every region of the shared module.
*/
for (uint32_t idxRegion = 0; idxRegion < pModule->cRegions; idxRegion++)
{
RTGCPTR GCPtrPage = paRegionsGCPtrs[idxRegion] & ~(RTGCPTR)PAGE_OFFSET_MASK;
uint32_t cbLeft = pModule->aRegions[idxRegion].cb; Assert(!(cbLeft & PAGE_OFFSET_MASK));
uint32_t idxPage = 0;
while (cbLeft)
{
/** @todo inefficient to fetch each guest page like this... */
RTGCPHYS GCPhys;
uint64_t fFlags;
rc = PGMGstGetPage(pVCpu, GCPtrPage, &fFlags, &GCPhys);
if ( rc == VINF_SUCCESS
&& !(fFlags & X86_PTE_RW)) /* important as we make assumptions about this below! */
{
PPGMPAGE pPage = pgmPhysGetPage(pVM, GCPhys);
Assert(!pPage || !PGM_PAGE_IS_BALLOONED(pPage));
if ( pPage
&& PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
&& PGM_PAGE_GET_READ_LOCKS(pPage) == 0
&& PGM_PAGE_GET_WRITE_LOCKS(pPage) == 0 )
{
PageDesc.idPage = PGM_PAGE_GET_PAGEID(pPage);
PageDesc.HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
PageDesc.GCPhys = GCPhys;
rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
if (RT_FAILURE(rc))
break;
/*
* Any change for this page?
*/
if (PageDesc.idPage != NIL_GMM_PAGEID)
{
Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
Log(("PGMR0SharedModuleCheck: shared page gst virt=%RGv phys=%RGp host %RHp->%RHp\n",
GCPtrPage, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
/* Page was either replaced by an existing shared
version of it or converted into a read-only shared
page, so, clear all references. */
bool fFlush = false;
rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
Assert( rc == VINF_SUCCESS
|| ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)
&& (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
if (rc == VINF_SUCCESS)
fFlushTLBs |= fFlush;
fFlushRemTLBs = true;
if (PageDesc.HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
{
/* Update the physical address and page id now. */
PGM_PAGE_SET_HCPHYS(pVM, pPage, PageDesc.HCPhys);
PGM_PAGE_SET_PAGEID(pVM, pPage, PageDesc.idPage);
/* Invalidate page map TLB entry for this page too. */
pgmPhysInvalidatePageMapTLBEntry(pVM, PageDesc.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(pVM, pPage, PGM_PAGE_STATE_SHARED);
# ifdef VBOX_STRICT /* check sum hack */
pPage->s.u2Unused0 = PageDesc.u32StrictChecksum & 3;
//pPage->s.u2Unused1 = (PageDesc.u32StrictChecksum >> 8) & 3;
# endif
}
}
}
else
{
Assert( rc == VINF_SUCCESS
|| rc == VERR_PAGE_NOT_PRESENT
|| rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
|| rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
|| rc == VERR_PAGE_TABLE_NOT_PRESENT);
rc = VINF_SUCCESS; /* ignore error */
}
idxPage++;
GCPtrPage += PAGE_SIZE;
cbLeft -= PAGE_SIZE;
}
}
/*
* Do TLB flushing if necessary.
*/
if (fFlushTLBs)
PGM_INVL_ALL_VCPU_TLBS(pVM);
if (fFlushRemTLBs)
for (VMCPUID idCurCpu = 0; idCurCpu < pGVM->cCpus; idCurCpu++)
CPUMSetChangedFlags(&pGVM->aCpus[idCurCpu], CPUM_CHANGED_GLOBAL_TLB_FLUSH);
return rc;
}
#endif /* VBOX_WITH_PAGE_SHARING */
|
