summaryrefslogtreecommitdiffstats
path: root/src/VBox/VMM/VMMRZ/VMMRZ.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/VBox/VMM/VMMRZ/VMMRZ.cpp')
-rw-r--r--src/VBox/VMM/VMMRZ/VMMRZ.cpp253
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;
+}
+
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 18:32:43 +0000