Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 180 insertions, 0 deletions

diff --git a/src/VBox/VMM/tools/VBoxCpuReportMsrLinux.cpp b/src/VBox/VMM/tools/VBoxCpuReportMsrLinux.cpp
new file mode 100644
index 00000000..37165869
--- /dev/null
+++ b/src/VBox/VMM/tools/VBoxCpuReportMsrLinux.cpp
@@ -0,0 +1,180 @@
+/* $Id: VBoxCpuReportMsrLinux.cpp $ */
+/** @file
+ * MsrLinux - Linux-specific MSR access.
+ */
+
+/*
+ * Copyright (C) 2013-2022 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                                                                                                                 *
+*********************************************************************************************************************************/
+#include "VBoxCpuReport.h"
+
+#include <iprt/err.h>
+#include <iprt/file.h>
+#include <iprt/thread.h>
+
+#ifndef RT_OS_WINDOWS
+# include <unistd.h>
+#else /* RT_OS_WINDOWS: for test compiling this file on windows */
+# include <io.h>
+int pread(int, void *, size_t, off_t);
+int pwrite(int, void const *, size_t, off_t);
+#endif
+#include <fcntl.h>
+#include <errno.h>
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define MSR_DEV_NAME    "/dev/cpu/0/msr"
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** The /dev/xxx/msr file descriptor. */
+static int              g_fdMsr;
+
+
+/**
+ * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnMsrProberRead}
+ */
+static DECLCALLBACK(int) linuxMsrProberRead(uint32_t uMsr, RTCPUID idCpu, uint64_t *puValue, bool *pfGp)
+{
+    int  rc = VINF_SUCCESS;
+
+    if (idCpu != NIL_RTCPUID)
+        return VERR_INVALID_PARAMETER;
+
+    if (g_fdMsr < 0)
+        return VERR_INVALID_STATE;
+
+    *pfGp = true;
+    if (pread(g_fdMsr, puValue, sizeof(*puValue), uMsr) != sizeof(*puValue))
+        rc = VERR_READ_ERROR;
+    else
+        *pfGp = false;
+
+    return RT_SUCCESS(rc) && !pfGp;
+}
+
+
+/**
+ * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnMsrProberWrite}
+ */
+static DECLCALLBACK(int) linuxMsrProberWrite(uint32_t uMsr, RTCPUID idCpu, uint64_t uValue, bool *pfGp)
+{
+    int  rc = VINF_SUCCESS;
+
+    if (idCpu != NIL_RTCPUID)
+        return VERR_INVALID_PARAMETER;
+
+    if (g_fdMsr < 0)
+        return VERR_INVALID_STATE;
+
+    *pfGp = true;
+    if (pwrite(g_fdMsr, &uValue, sizeof(uValue), uMsr) != sizeof(uValue))
+        rc = VERR_WRITE_ERROR;
+    else
+        *pfGp = false;
+
+    return RT_SUCCESS(rc) && !pfGp;
+}
+
+/**
+ * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnMsrProberModify}
+ */
+static DECLCALLBACK(int) linuxMsrProberModify(uint32_t uMsr, RTCPUID idCpu, uint64_t fAndMask, uint64_t fOrMask,
+                                              PSUPMSRPROBERMODIFYRESULT pResult)
+{
+    int         rc = VINF_SUCCESS;
+    uint64_t    uBefore, uWrite, uAfter;
+    int         rcBefore, rcWrite, rcAfter, rcRestore;
+
+    if (idCpu != NIL_RTCPUID)
+        return VERR_INVALID_PARAMETER;
+
+    if (g_fdMsr < 0)
+        return VERR_INVALID_STATE;
+
+#if 0
+    vbCpuRepDebug("MSR %#x\n", uMsr);
+    RTThreadSleep(10);
+#endif
+    rcBefore = pread(g_fdMsr, &uBefore, sizeof(uBefore), uMsr);
+    uWrite = (uBefore & fAndMask) | fOrMask;
+    rcWrite = pwrite(g_fdMsr, &uWrite, sizeof(uWrite), uMsr);
+    rcAfter = pread(g_fdMsr, &uAfter, sizeof(uAfter), uMsr);
+    rcRestore = pwrite(g_fdMsr, &uBefore, sizeof(uBefore), uMsr);
+
+#if 0
+    vbCpuRepDebug("MSR: %#x, %#llx -> %#llx -> %#llx (%d/%d/%d/%d)\n",
+                  uMsr, uBefore, uWrite, uAfter,
+                  rcBefore, rcWrite != sizeof(uWrite), rcAfter, rcRestore);
+#endif
+    pResult->uBefore    = uBefore;
+    pResult->uWritten   = uWrite;
+    pResult->uAfter     = uAfter;
+    pResult->fBeforeGp  = rcBefore  != sizeof(uBefore);
+    pResult->fModifyGp  = rcWrite   != sizeof(uWrite);
+    pResult->fAfterGp   = rcAfter   != sizeof(uAfter);
+    pResult->fRestoreGp = rcRestore != sizeof(uBefore);
+
+    return rc;
+}
+
+
+/**
+ * @interface_method_impl{VBCPUREPMSRACCESSORS,pfnTerm}
+ */
+static DECLCALLBACK(void) linuxMsrProberTerm(void)
+{
+    if (g_fdMsr >= 0)
+    {
+        close(g_fdMsr);
+        g_fdMsr = -1;
+    }
+}
+
+int VbCpuRepMsrProberInitPlatform(PVBCPUREPMSRACCESSORS pMsrAccessors)
+{
+    RTFILE hFile;
+    int rc = RTFileOpen(&hFile, MSR_DEV_NAME, RTFILE_O_READWRITE | RTFILE_O_DENY_NONE | RTFILE_O_OPEN);
+    if (RT_SUCCESS(rc))
+    {
+        g_fdMsr = RTFileToNative(hFile);
+        Assert(g_fdMsr != -1);
+
+        pMsrAccessors->fAtomic             = false; /* Can't modify/restore MSRs without trip to R3. */
+        pMsrAccessors->pfnMsrProberRead    = linuxMsrProberRead;
+        pMsrAccessors->pfnMsrProberWrite   = linuxMsrProberWrite;
+        pMsrAccessors->pfnMsrProberModify  = linuxMsrProberModify;
+        pMsrAccessors->pfnTerm             = linuxMsrProberTerm;
+        return VINF_SUCCESS;
+    }
+    vbCpuRepDebug("warning: Failed to open " MSR_DEV_NAME ": %Rrc\n", rc);
+    return rc;
+}