blob: ce089f4a2c2d81b4b5f44152549b25637032b96d (
plain)
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
|
/* $Id: VMMRZ.cpp $ */
/** @file
* VMM - Virtual Machine Monitor, Raw-mode and ring-0 context code.
*/
/*
* Copyright (C) 2009-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_VMM
#include <VBox/vmm/vmm.h>
#include "VMMInternal.h"
#include <VBox/vmm/vmcc.h>
#include <iprt/assert.h>
#include <iprt/asm-amd64-x86.h>
#include <iprt/errcore.h>
#include <iprt/string.h>
/**
* Disables all host calls, except certain fatal ones.
*
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
* @thread EMT.
*/
VMMRZDECL(void) VMMRZCallRing3Disable(PVMCPUCC pVCpu)
{
VMCPU_ASSERT_EMT(pVCpu);
#if defined(LOG_ENABLED) && defined(IN_RING0)
RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
#endif
Assert(pVCpu->vmmr0.s.cCallRing3Disabled < 16);
if (ASMAtomicUoIncU32(&pVCpu->vmmr0.s.cCallRing3Disabled) == 1)
{
#ifdef IN_RC
pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = true;
#else
pVCpu->vmmr0.s.fLogFlushingDisabled = true;
#endif
}
#if defined(LOG_ENABLED) && defined(IN_RING0)
ASMSetFlags(fFlags);
#endif
}
/**
* Counters VMMRZCallRing3Disable() and re-enables host calls.
*
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
* @thread EMT.
*/
VMMRZDECL(void) VMMRZCallRing3Enable(PVMCPUCC pVCpu)
{
VMCPU_ASSERT_EMT(pVCpu);
#if defined(LOG_ENABLED) && defined(IN_RING0)
RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
#endif
Assert(pVCpu->vmmr0.s.cCallRing3Disabled > 0);
if (ASMAtomicUoDecU32(&pVCpu->vmmr0.s.cCallRing3Disabled) == 0)
{
#ifdef IN_RC
pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = false;
#else
pVCpu->vmmr0.s.fLogFlushingDisabled = false;
#endif
}
#if defined(LOG_ENABLED) && defined(IN_RING0)
ASMSetFlags(fFlags);
#endif
}
/**
* Checks whether its possible to call host context or not.
*
* @returns true if it's safe, false if it isn't.
* @param pVCpu The cross context virtual CPU structure of the calling EMT.
*/
VMMRZDECL(bool) VMMRZCallRing3IsEnabled(PVMCPUCC pVCpu)
{
VMCPU_ASSERT_EMT(pVCpu);
Assert(pVCpu->vmmr0.s.cCallRing3Disabled <= 16);
return pVCpu->vmmr0.s.cCallRing3Disabled == 0;
}
|
