VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMAll/PDMAllCritSectBoth.cpp@ 93762

Last change on this file since 93762 was 93115, checked in by vboxsync, 3 years ago

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File size: 4.3 KB
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1/* $Id: PDMAllCritSectBoth.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
2/** @file
3 * PDM - Code Common to Both Critical Section Types, All Contexts.
4 */
5
6/*
7 * Copyright (C) 2006-2022 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/*********************************************************************************************************************************
20* Header Files *
21*********************************************************************************************************************************/
22#define LOG_GROUP LOG_GROUP_PDM_CRITSECT
23#include "PDMInternal.h"
24#include <VBox/vmm/pdmcritsect.h>
25#include <VBox/vmm/pdmcritsectrw.h>
26#include <VBox/vmm/vmcc.h>
27#include <iprt/errcore.h>
28
29#include <VBox/log.h>
30#include <iprt/assert.h>
31#include <iprt/asm.h>
32
33
34#if defined(IN_RING3) /*|| defined(IN_RING0) - not called from ring-0 */
35/**
36 * Process the critical sections (both types) queued for ring-3 'leave'.
37 *
38 * @param pVM The cross context VM structure.
39 * @param pVCpu The cross context virtual CPU structure.
40 */
41VMM_INT_DECL(void) PDMCritSectBothFF(PVMCC pVM, PVMCPUCC pVCpu)
42{
43 uint32_t i;
44 Assert( pVCpu->pdm.s.cQueuedCritSectLeaves > 0
45 || pVCpu->pdm.s.cQueuedCritSectRwShrdLeaves > 0
46 || pVCpu->pdm.s.cQueuedCritSectRwExclLeaves > 0);
47
48 /* Shared leaves. */
49 i = pVCpu->pdm.s.cQueuedCritSectRwShrdLeaves;
50 pVCpu->pdm.s.cQueuedCritSectRwShrdLeaves = 0;
51 while (i-- > 0)
52 {
53# ifdef IN_RING3
54 PPDMCRITSECTRW pCritSectRw = pVCpu->pdm.s.apQueuedCritSectRwShrdLeaves[i];
55# else
56 PPDMCRITSECTRW pCritSectRw = (PPDMCRITSECTRW)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM),
57 pVCpu->pdm.s.apQueuedCritSectRwShrdLeaves[i]);
58# endif
59
60 pdmCritSectRwLeaveSharedQueued(pVM, pCritSectRw);
61 LogIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP_PDM_CRITSECTRW, ("PDMR3CritSectFF: %p (shared)\n", pCritSectRw));
62 }
63
64 /* Last, exclusive leaves. */
65 i = pVCpu->pdm.s.cQueuedCritSectRwExclLeaves;
66 pVCpu->pdm.s.cQueuedCritSectRwExclLeaves = 0;
67 while (i-- > 0)
68 {
69# ifdef IN_RING3
70 PPDMCRITSECTRW pCritSectRw = pVCpu->pdm.s.apQueuedCritSectRwExclLeaves[i];
71# else
72 PPDMCRITSECTRW pCritSectRw = (PPDMCRITSECTRW)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM),
73 pVCpu->pdm.s.apQueuedCritSectRwExclLeaves[i]);
74# endif
75
76 pdmCritSectRwLeaveExclQueued(pVM, pCritSectRw);
77 LogIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP_PDM_CRITSECTRW, ("PDMR3CritSectFF: %p (exclusive)\n", pCritSectRw));
78 }
79
80 /* Normal leaves. */
81 i = pVCpu->pdm.s.cQueuedCritSectLeaves;
82 pVCpu->pdm.s.cQueuedCritSectLeaves = 0;
83 while (i-- > 0)
84 {
85# ifdef IN_RING3
86 PPDMCRITSECT pCritSect = pVCpu->pdm.s.apQueuedCritSectLeaves[i];
87# else
88 PPDMCRITSECT pCritSect = (PPDMCRITSECT)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM), pVCpu->pdm.s.apQueuedCritSectLeaves[i]);
89# endif
90 Assert(pCritSect->s.Core.NativeThreadOwner == pVCpu->hNativeThread);
91
92 /* Note! We *must* clear the pending-unlock flag here and not depend on
93 PDMCritSectLeave to do it, as the EMT might be sitting on
94 further nestings since it queued the section to be left, and
95 leaving it set would throw subsequent PDMCritSectIsOwner calls.
96
97 This will happen with the PGM lock if we nip back to ring-3 for
98 more handy pages or similar where the lock is supposed to be
99 held while in ring-3. */
100 ASMAtomicAndU32(&pCritSect->s.Core.fFlags, ~PDMCRITSECT_FLAGS_PENDING_UNLOCK);
101 PDMCritSectLeave(pVM, pCritSect);
102 LogFlow(("PDMR3CritSectFF: %p\n", pCritSect));
103 }
104
105 VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_PDM_CRITSECT);
106}
107#endif /* IN_RING3 || IN_RING0 */
108
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