| 1 | /* $Id: PDMAllCritSectBoth.cpp 92702 2021-12-02 12:43:15Z vboxsync $ */
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| 2 | /** @file
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| 3 | * PDM - Code Common to Both Critical Section Types, All Contexts.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2020 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_PDM_CRITSECT
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| 23 | #include "PDMInternal.h"
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| 24 | #include <VBox/vmm/pdmcritsect.h>
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| 25 | #include <VBox/vmm/pdmcritsectrw.h>
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| 26 | #include <VBox/vmm/vmcc.h>
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| 27 | #include <iprt/errcore.h>
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| 28 |
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| 29 | #include <VBox/log.h>
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| 30 | #include <iprt/assert.h>
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| 31 | #include <iprt/asm.h>
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| 32 |
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| 33 |
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| 34 | #if defined(IN_RING3) /*|| defined(IN_RING0) - not called from ring-0 */
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| 35 | /**
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| 36 | * Process the critical sections (both types) queued for ring-3 'leave'.
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| 37 | *
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| 38 | * @param pVM The cross context VM structure.
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| 39 | * @param pVCpu The cross context virtual CPU structure.
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| 40 | */
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| 41 | VMM_INT_DECL(void) PDMCritSectBothFF(PVMCC pVM, PVMCPUCC pVCpu)
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| 42 | {
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| 43 | uint32_t i;
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| 44 | Assert( pVCpu->pdm.s.cQueuedCritSectLeaves > 0
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| 45 | || pVCpu->pdm.s.cQueuedCritSectRwShrdLeaves > 0
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| 46 | || pVCpu->pdm.s.cQueuedCritSectRwExclLeaves > 0);
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| 47 |
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| 48 | /* Shared leaves. */
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| 49 | i = pVCpu->pdm.s.cQueuedCritSectRwShrdLeaves;
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| 50 | pVCpu->pdm.s.cQueuedCritSectRwShrdLeaves = 0;
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| 51 | while (i-- > 0)
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| 52 | {
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| 53 | # ifdef IN_RING3
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| 54 | PPDMCRITSECTRW pCritSectRw = pVCpu->pdm.s.apQueuedCritSectRwShrdLeaves[i];
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| 55 | # else
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| 56 | PPDMCRITSECTRW pCritSectRw = (PPDMCRITSECTRW)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM),
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| 57 | pVCpu->pdm.s.apQueuedCritSectRwShrdLeaves[i]);
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| 58 | # endif
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| 59 |
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| 60 | pdmCritSectRwLeaveSharedQueued(pVM, pCritSectRw);
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| 61 | LogIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP_PDM_CRITSECTRW, ("PDMR3CritSectFF: %p (shared)\n", pCritSectRw));
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| 62 | }
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| 63 |
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| 64 | /* Last, exclusive leaves. */
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| 65 | i = pVCpu->pdm.s.cQueuedCritSectRwExclLeaves;
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| 66 | pVCpu->pdm.s.cQueuedCritSectRwExclLeaves = 0;
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| 67 | while (i-- > 0)
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| 68 | {
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| 69 | # ifdef IN_RING3
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| 70 | PPDMCRITSECTRW pCritSectRw = pVCpu->pdm.s.apQueuedCritSectRwExclLeaves[i];
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| 71 | # else
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| 72 | PPDMCRITSECTRW pCritSectRw = (PPDMCRITSECTRW)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM),
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| 73 | pVCpu->pdm.s.apQueuedCritSectRwExclLeaves[i]);
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| 74 | # endif
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| 75 |
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| 76 | pdmCritSectRwLeaveExclQueued(pVM, pCritSectRw);
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| 77 | LogIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP_PDM_CRITSECTRW, ("PDMR3CritSectFF: %p (exclusive)\n", pCritSectRw));
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| 78 | }
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| 79 |
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| 80 | /* Normal leaves. */
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| 81 | i = pVCpu->pdm.s.cQueuedCritSectLeaves;
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| 82 | pVCpu->pdm.s.cQueuedCritSectLeaves = 0;
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| 83 | while (i-- > 0)
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| 84 | {
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| 85 | # ifdef IN_RING3
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| 86 | PPDMCRITSECT pCritSect = pVCpu->pdm.s.apQueuedCritSectLeaves[i];
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| 87 | # else
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| 88 | PPDMCRITSECT pCritSect = (PPDMCRITSECT)MMHyperR3ToCC(pVCpu->CTX_SUFF(pVM), pVCpu->pdm.s.apQueuedCritSectLeaves[i]);
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| 89 | # endif
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| 90 | Assert(pCritSect->s.Core.NativeThreadOwner == pVCpu->hNativeThread);
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| 91 |
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| 92 | /* Note! We *must* clear the pending-unlock flag here and not depend on
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| 93 | PDMCritSectLeave to do it, as the EMT might be sitting on
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| 94 | further nestings since it queued the section to be left, and
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| 95 | leaving it set would throw subsequent PDMCritSectIsOwner calls.
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| 96 |
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| 97 | This will happen with the PGM lock if we nip back to ring-3 for
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| 98 | more handy pages or similar where the lock is supposed to be
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| 99 | held while in ring-3. */
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| 100 | ASMAtomicAndU32(&pCritSect->s.Core.fFlags, ~PDMCRITSECT_FLAGS_PENDING_UNLOCK);
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| 101 | PDMCritSectLeave(pVM, pCritSect);
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| 102 | LogFlow(("PDMR3CritSectFF: %p\n", pCritSect));
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| 103 | }
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| 104 |
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| 105 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_PDM_CRITSECT);
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| 106 | }
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| 107 | #endif /* IN_RING3 || IN_RING0 */
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| 108 |
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