1 | /* $Id: VBoxCpuReportMsrSup.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
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2 | /** @file
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3 | * MsrSup - SupDrv-specific MSR access.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2013-2022 Oracle and/or its affiliates.
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8 | *
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9 | * This file is part of VirtualBox base platform packages, as
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10 | * available from https://www.virtualbox.org.
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11 | *
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12 | * This program is free software; you can redistribute it and/or
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13 | * modify it under the terms of the GNU General Public License
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14 | * as published by the Free Software Foundation, in version 3 of the
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15 | * License.
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16 | *
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17 | * This program is distributed in the hope that it will be useful, but
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18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 | * General Public License for more details.
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21 | *
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22 | * You should have received a copy of the GNU General Public License
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23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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24 | *
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25 | * SPDX-License-Identifier: GPL-3.0-only
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26 | */
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27 |
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28 |
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29 | /*********************************************************************************************************************************
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30 | * Header Files *
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31 | *********************************************************************************************************************************/
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32 | #include "VBoxCpuReport.h"
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33 | #include <iprt/errcore.h>
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34 | #include <iprt/x86.h>
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35 |
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36 |
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37 | int VbCpuRepMsrProberInitSupDrv(PVBCPUREPMSRACCESSORS pMsrFunctions)
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38 | {
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39 | int rc = SUPR3Init(NULL);
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40 | if (RT_SUCCESS(rc))
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41 | {
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42 | /* Test if the MSR prober is available, since the interface is optional. The TSC MSR will exist on any supported CPU. */
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43 | uint64_t uValue;
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44 | bool fGp;
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45 | rc = SUPR3MsrProberRead(MSR_IA32_TSC, NIL_RTCPUID, &uValue, &fGp);
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46 | if ( rc != VERR_NOT_IMPLEMENTED
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47 | && rc != VERR_INVALID_FUNCTION)
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48 | {
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49 | pMsrFunctions->fAtomic = true;
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50 | pMsrFunctions->pfnMsrProberRead = SUPR3MsrProberRead;
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51 | pMsrFunctions->pfnMsrProberWrite = SUPR3MsrProberWrite;
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52 | pMsrFunctions->pfnMsrProberModify = SUPR3MsrProberModify;
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53 |
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54 | pMsrFunctions->pfnTerm = NULL;
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55 | return VINF_SUCCESS;
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56 |
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57 | }
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58 | vbCpuRepDebug("warning: MSR probing not supported by the support driver (%Rrc).\n", rc);
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59 | }
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60 | else
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61 | vbCpuRepDebug("warning: Unable to initialize the support library (%Rrc).\n", rc);
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62 | return rc;
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63 | }
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64 |
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