Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

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

1 files changed, 253 insertions, 0 deletions

diff --git a/src/VBox/VMM/VMMRZ/VMMRZ.cpp b/src/VBox/VMM/VMMRZ/VMMRZ.cpp
new file mode 100644
index 00000000..fd8ccd5c
--- /dev/null
+++ b/src/VBox/VMM/VMMRZ/VMMRZ.cpp
@@ -0,0 +1,253 @@
+/* $Id: VMMRZ.cpp $ */
+/** @file
+ * VMM - Virtual Machine Monitor, Raw-mode and ring-0 context code.
+ */
+
+/*
+ * Copyright (C) 2009-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP LOG_GROUP_VMM
+#include <VBox/vmm/vmm.h>
+#include "VMMInternal.h"
+#include <VBox/vmm/vmcc.h>
+#include <VBox/err.h>
+
+#include <iprt/assert.h>
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/string.h>
+
+
+/**
+ * Calls the ring-3 host code.
+ *
+ * @returns VBox status code of the ring-3 call.
+ * @retval  VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
+ *          be passed up the stack, or if that isn't possible then VMMRZCallRing3
+ *          needs to change it into an assertion.
+ *
+ *
+ * @param   pVM             The cross context VM structure.
+ * @param   pVCpu           The cross context virtual CPU structure of the calling EMT.
+ * @param   enmOperation    The operation.
+ * @param   uArg            The argument to the operation.
+ */
+VMMRZDECL(int) VMMRZCallRing3(PVMCC pVM, PVMCPUCC pVCpu, VMMCALLRING3 enmOperation, uint64_t uArg)
+{
+    VMCPU_ASSERT_EMT(pVCpu);
+
+    /*
+     * Check if calling ring-3 has been disabled and only let let fatal calls thru.
+     */
+    if (RT_UNLIKELY(    pVCpu->vmm.s.cCallRing3Disabled != 0
+                    &&  enmOperation != VMMCALLRING3_VM_R0_ASSERTION))
+    {
+#ifndef IN_RING0
+        /*
+         * In most cases, it's sufficient to return a status code which
+         * will then be propagated up the code usually encountering several
+         * AssertRC invocations along the way. Hitting one of those is more
+         * helpful than stopping here.
+         *
+         * However, some doesn't check the status code because they are called
+         * from void functions, and for these we'll turn this into a ring-0
+         * assertion host call.
+         */
+        if (enmOperation != VMMCALLRING3_REM_REPLAY_HANDLER_NOTIFICATIONS)
+            return VERR_VMM_RING3_CALL_DISABLED;
+#endif
+#ifdef IN_RC
+        RTStrPrintf(g_szRTAssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
+                    "VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x cCallRing3Disabled=%#x\n",
+                    enmOperation, uArg, pVCpu->idCpu, pVCpu->vmm.s.cCallRing3Disabled);
+#endif
+        RTStrPrintf(pVM->vmm.s.szRing0AssertMsg1, sizeof(pVM->vmm.s.szRing0AssertMsg1),
+                    "VMMRZCallRing3: enmOperation=%d uArg=%#llx idCpu=%#x cCallRing3Disabled=%#x\n",
+                    enmOperation, uArg, pVCpu->idCpu, pVCpu->vmm.s.cCallRing3Disabled);
+        enmOperation = VMMCALLRING3_VM_R0_ASSERTION;
+    }
+
+    /*
+     * The normal path.
+     */
+/** @todo profile this! */
+    pVCpu->vmm.s.enmCallRing3Operation = enmOperation;
+    pVCpu->vmm.s.u64CallRing3Arg = uArg;
+    pVCpu->vmm.s.rcCallRing3 = VERR_VMM_RING3_CALL_NO_RC;
+#ifdef IN_RC
+    pVM->vmm.s.pfnRCToHost(VINF_VMM_CALL_HOST);
+#else
+    int rc;
+    if (pVCpu->vmm.s.pfnCallRing3CallbackR0)
+    {
+        rc = pVCpu->vmm.s.pfnCallRing3CallbackR0(pVCpu, enmOperation, pVCpu->vmm.s.pvCallRing3CallbackUserR0);
+        if (RT_FAILURE(rc))
+            return rc;
+    }
+    rc = vmmR0CallRing3LongJmp(&pVCpu->vmm.s.CallRing3JmpBufR0, VINF_VMM_CALL_HOST);
+    if (RT_FAILURE(rc))
+        return rc;
+#endif
+    return pVCpu->vmm.s.rcCallRing3;
+}
+
+
+/**
+ * Simple wrapper that adds the pVCpu argument.
+ *
+ * @returns VBox status code of the ring-3 call.
+ * @retval  VERR_VMM_RING3_CALL_DISABLED if called at the wrong time. This must
+ *          be passed up the stack, or if that isn't possible then VMMRZCallRing3
+ *          needs to change it into an assertion.
+ *
+ * @param   pVM             The cross context VM structure.
+ * @param   enmOperation    The operation.
+ * @param   uArg            The argument to the operation.
+ */
+VMMRZDECL(int) VMMRZCallRing3NoCpu(PVMCC pVM, VMMCALLRING3 enmOperation, uint64_t uArg)
+{
+    return VMMRZCallRing3(pVM, VMMGetCpu(pVM), enmOperation, uArg);
+}
+
+
+/**
+ * Disables all host calls, except certain fatal ones.
+ *
+ * @param   pVCpu               The cross context virtual CPU structure of the calling EMT.
+ * @thread  EMT.
+ */
+VMMRZDECL(void) VMMRZCallRing3Disable(PVMCPUCC pVCpu)
+{
+    VMCPU_ASSERT_EMT(pVCpu);
+#if defined(LOG_ENABLED) && defined(IN_RING0)
+    RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
+#endif
+
+    Assert(pVCpu->vmm.s.cCallRing3Disabled < 16);
+    if (ASMAtomicUoIncU32(&pVCpu->vmm.s.cCallRing3Disabled) == 1)
+    {
+        /** @todo it might make more sense to just disable logging here, then we
+         * won't flush away important bits... but that goes both ways really. */
+#ifdef IN_RC
+        pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = true;
+#else
+# ifdef LOG_ENABLED
+        if (pVCpu->vmm.s.pR0LoggerR0)
+            pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = true;
+# endif
+        if (pVCpu->vmm.s.pR0RelLoggerR0)
+            pVCpu->vmm.s.pR0RelLoggerR0->fFlushingDisabled = true;
+#endif
+    }
+
+#if defined(LOG_ENABLED) && defined(IN_RING0)
+    ASMSetFlags(fFlags);
+#endif
+}
+
+
+/**
+ * Counters VMMRZCallRing3Disable() and re-enables host calls.
+ *
+ * @param   pVCpu               The cross context virtual CPU structure of the calling EMT.
+ * @thread  EMT.
+ */
+VMMRZDECL(void) VMMRZCallRing3Enable(PVMCPUCC pVCpu)
+{
+    VMCPU_ASSERT_EMT(pVCpu);
+#if defined(LOG_ENABLED) && defined(IN_RING0)
+    RTCCUINTREG fFlags = ASMIntDisableFlags(); /* preemption consistency. */
+#endif
+
+    Assert(pVCpu->vmm.s.cCallRing3Disabled > 0);
+    if (ASMAtomicUoDecU32(&pVCpu->vmm.s.cCallRing3Disabled) == 0)
+    {
+#ifdef IN_RC
+        pVCpu->pVMRC->vmm.s.fRCLoggerFlushingDisabled = false;
+#else
+# ifdef LOG_ENABLED
+        if (pVCpu->vmm.s.pR0LoggerR0)
+            pVCpu->vmm.s.pR0LoggerR0->fFlushingDisabled = false;
+# endif
+        if (pVCpu->vmm.s.pR0RelLoggerR0)
+            pVCpu->vmm.s.pR0RelLoggerR0->fFlushingDisabled = false;
+#endif
+    }
+
+#if defined(LOG_ENABLED) && defined(IN_RING0)
+    ASMSetFlags(fFlags);
+#endif
+}
+
+
+/**
+ * Checks whether its possible to call host context or not.
+ *
+ * @returns true if it's safe, false if it isn't.
+ * @param   pVCpu               The cross context virtual CPU structure of the calling EMT.
+ */
+VMMRZDECL(bool) VMMRZCallRing3IsEnabled(PVMCPUCC pVCpu)
+{
+    VMCPU_ASSERT_EMT(pVCpu);
+    Assert(pVCpu->vmm.s.cCallRing3Disabled <= 16);
+    return pVCpu->vmm.s.cCallRing3Disabled == 0;
+}
+
+
+/**
+ * Sets the ring-0 callback before doing the ring-3 call.
+ *
+ * @param   pVCpu         The cross context virtual CPU structure.
+ * @param   pfnCallback   Pointer to the callback.
+ * @param   pvUser        The user argument.
+ *
+ * @return VBox status code.
+ */
+VMMRZDECL(int) VMMRZCallRing3SetNotification(PVMCPUCC pVCpu, R0PTRTYPE(PFNVMMR0CALLRING3NOTIFICATION) pfnCallback, RTR0PTR pvUser)
+{
+    AssertPtrReturn(pVCpu, VERR_INVALID_POINTER);
+    AssertPtrReturn(pfnCallback, VERR_INVALID_POINTER);
+
+    if (pVCpu->vmm.s.pfnCallRing3CallbackR0)
+        return VERR_ALREADY_EXISTS;
+
+    pVCpu->vmm.s.pfnCallRing3CallbackR0    = pfnCallback;
+    pVCpu->vmm.s.pvCallRing3CallbackUserR0 = pvUser;
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Removes the ring-0 callback.
+ *
+ * @param   pVCpu   The cross context virtual CPU structure.
+ */
+VMMRZDECL(void) VMMRZCallRing3RemoveNotification(PVMCPUCC pVCpu)
+{
+    pVCpu->vmm.s.pfnCallRing3CallbackR0 = NULL;
+}
+
+
+/**
+ * Checks whether there is a ring-0 callback notification active.
+ *
+ * @param   pVCpu   The cross context virtual CPU structure.
+ * @returns true if there the notification is active, false otherwise.
+ */
+VMMRZDECL(bool) VMMRZCallRing3IsNotificationSet(PVMCPUCC pVCpu)
+{
+    return pVCpu->vmm.s.pfnCallRing3CallbackR0 != NULL;
+}
+