| 1 | /* $Id: VBoxGuestR3LibBalloon.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
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| 2 | /** @file
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| 3 | * VBoxGuestR3Lib - Ring-3 Support Library for VirtualBox guest additions, Ballooning.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2020 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 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include "VBoxGuestR3LibInternal.h"
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| 32 | #include <iprt/string.h>
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| 33 |
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| 34 |
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| 35 | /**
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| 36 | * Refresh the memory balloon after a change.
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| 37 | *
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| 38 | * @returns IPRT status code.
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| 39 | * @param pcChunks The size of the balloon in chunks of 1MB (out).
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| 40 | * @param pfHandleInR3 Allocating of memory in R3 required (out).
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| 41 | */
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| 42 | VBGLR3DECL(int) VbglR3MemBalloonRefresh(uint32_t *pcChunks, bool *pfHandleInR3)
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| 43 | {
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| 44 | VBGLIOCCHECKBALLOON Info;
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| 45 | VBGLREQHDR_INIT(&Info.Hdr, CHECK_BALLOON);
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| 46 | int rc = vbglR3DoIOCtl(VBGL_IOCTL_CHECK_BALLOON, &Info.Hdr, sizeof(Info));
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| 47 | if (RT_SUCCESS(rc))
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| 48 | {
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| 49 | *pcChunks = Info.u.Out.cBalloonChunks;
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| 50 | *pfHandleInR3 = Info.u.Out.fHandleInR3 != false;
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| 51 | }
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| 52 | return rc;
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| 53 | }
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| 54 |
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| 55 |
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| 56 | /**
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| 57 | * Change the memory by granting/reclaiming memory to/from R0.
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| 58 | *
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| 59 | * @returns IPRT status code.
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| 60 | * @param pv Memory chunk (1MB).
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| 61 | * @param fInflate true = inflate balloon (grant memory).
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| 62 | * false = deflate balloon (reclaim memory).
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| 63 | */
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| 64 | VBGLR3DECL(int) VbglR3MemBalloonChange(void *pv, bool fInflate)
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| 65 | {
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| 66 | VBGLIOCCHANGEBALLOON Info;
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| 67 | VBGLREQHDR_INIT(&Info.Hdr, CHANGE_BALLOON);
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| 68 | Info.u.In.pvChunk = pv;
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| 69 | Info.u.In.fInflate = fInflate;
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| 70 | RT_ZERO(Info.u.In.abPadding);
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| 71 | return vbglR3DoIOCtl(VBGL_IOCTL_CHANGE_BALLOON, &Info.Hdr, sizeof(Info));
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| 72 | }
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| 73 |
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