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, 477 insertions, 0 deletions

diff --git a/src/VBox/VMM/VMMR3/EMHM.cpp b/src/VBox/VMM/VMMR3/EMHM.cpp
new file mode 100644
index 00000000..378b40f8
--- /dev/null
+++ b/src/VBox/VMM/VMMR3/EMHM.cpp
@@ -0,0 +1,477 @@
+/* $Id: EMHM.cpp $ */
+/** @file
+ * EM - Execution Monitor / Manager - hardware virtualization
+ */
+
+/*
+ * Copyright (C) 2006-2020 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_EM
+#define VMCPU_INCL_CPUM_GST_CTX
+#include <VBox/vmm/em.h>
+#include <VBox/vmm/vmm.h>
+#include <VBox/vmm/selm.h>
+#include <VBox/vmm/trpm.h>
+#include <VBox/vmm/iem.h>
+#include <VBox/vmm/iom.h>
+#include <VBox/vmm/dbgf.h>
+#include <VBox/vmm/pgm.h>
+#include <VBox/vmm/tm.h>
+#include <VBox/vmm/mm.h>
+#include <VBox/vmm/ssm.h>
+#include <VBox/vmm/pdmapi.h>
+#include <VBox/vmm/pdmcritsect.h>
+#include <VBox/vmm/pdmqueue.h>
+#include <VBox/vmm/hm.h>
+#include "EMInternal.h"
+#include <VBox/vmm/vm.h>
+#include <VBox/vmm/gim.h>
+#include <VBox/vmm/cpumdis.h>
+#include <VBox/dis.h>
+#include <VBox/disopcode.h>
+#include <VBox/err.h>
+#include <VBox/vmm/dbgf.h>
+#include "VMMTracing.h"
+
+#include <iprt/asm.h>
+
+
+/*********************************************************************************************************************************
+*   Internal Functions                                                                                                           *
+*********************************************************************************************************************************/
+static int      emR3HmHandleRC(PVM pVM, PVMCPU pVCpu, int rc);
+DECLINLINE(int) emR3HmExecuteInstruction(PVM pVM, PVMCPU pVCpu, const char *pszPrefix, int rcGC = VINF_SUCCESS);
+static int      emR3HmExecuteIOInstruction(PVM pVM, PVMCPU pVCpu);
+static int      emR3HmForcedActions(PVM pVM, PVMCPU pVCpu);
+
+#define EMHANDLERC_WITH_HM
+#define emR3ExecuteInstruction   emR3HmExecuteInstruction
+#define emR3ExecuteIOInstruction emR3HmExecuteIOInstruction
+#include "EMHandleRCTmpl.h"
+
+
+/**
+ * Executes instruction in HM mode if we can.
+ *
+ * This is somewhat comparable to REMR3EmulateInstruction.
+ *
+ * @returns VBox strict status code.
+ * @retval  VINF_EM_DBG_STEPPED on success.
+ * @retval  VERR_EM_CANNOT_EXEC_GUEST if we cannot execute guest instructions in
+ *          HM right now.
+ *
+ * @param   pVM     The cross context VM structure.
+ * @param   pVCpu   The cross context virtual CPU structure for the calling EMT.
+ * @param   fFlags  Combinations of EM_ONE_INS_FLAGS_XXX.
+ * @thread  EMT.
+ */
+VMMR3_INT_DECL(VBOXSTRICTRC) EMR3HmSingleInstruction(PVM pVM, PVMCPU pVCpu, uint32_t fFlags)
+{
+    Assert(!(fFlags & ~EM_ONE_INS_FLAGS_MASK));
+
+    if (!HMCanExecuteGuest(pVM, pVCpu, &pVCpu->cpum.GstCtx))
+        return VINF_EM_RESCHEDULE;
+
+    uint64_t const uOldRip = pVCpu->cpum.GstCtx.rip;
+    for (;;)
+    {
+        /*
+         * Service necessary FFs before going into HM.
+         */
+        if (   VM_FF_IS_ANY_SET(pVM, VM_FF_HIGH_PRIORITY_PRE_RAW_MASK)
+            || VMCPU_FF_IS_ANY_SET(pVCpu, VMCPU_FF_HIGH_PRIORITY_PRE_RAW_MASK))
+        {
+            VBOXSTRICTRC rcStrict = emR3HmForcedActions(pVM, pVCpu);
+            if (rcStrict != VINF_SUCCESS)
+            {
+                Log(("EMR3HmSingleInstruction: FFs before -> %Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
+                return rcStrict;
+            }
+        }
+
+        /*
+         * Go execute it.
+         */
+        bool fOld = HMSetSingleInstruction(pVM, pVCpu, true);
+        VBOXSTRICTRC rcStrict = VMMR3HmRunGC(pVM, pVCpu);
+        HMSetSingleInstruction(pVM, pVCpu, fOld);
+        LogFlow(("EMR3HmSingleInstruction: %Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
+
+        /*
+         * Handle high priority FFs and informational status codes.  We don't do
+         * normal FF processing the caller or the next call can deal with them.
+         */
+        VMCPU_FF_CLEAR_MASK(pVCpu, VMCPU_FF_RESUME_GUEST_MASK);
+        if (   VM_FF_IS_ANY_SET(pVM, VM_FF_HIGH_PRIORITY_POST_MASK)
+            || VMCPU_FF_IS_ANY_SET(pVCpu, VMCPU_FF_HIGH_PRIORITY_POST_MASK))
+        {
+            rcStrict = emR3HighPriorityPostForcedActions(pVM, pVCpu, rcStrict);
+            LogFlow(("EMR3HmSingleInstruction: FFs after -> %Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
+        }
+
+        if (rcStrict != VINF_SUCCESS && (rcStrict < VINF_EM_FIRST || rcStrict > VINF_EM_LAST))
+        {
+            rcStrict = emR3HmHandleRC(pVM, pVCpu, VBOXSTRICTRC_TODO(rcStrict));
+            Log(("EMR3HmSingleInstruction: emR3HmHandleRC -> %Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
+        }
+
+        /*
+         * Done?
+         */
+        if (   (rcStrict != VINF_SUCCESS && rcStrict != VINF_EM_DBG_STEPPED)
+            || !(fFlags & EM_ONE_INS_FLAGS_RIP_CHANGE)
+            || pVCpu->cpum.GstCtx.rip != uOldRip)
+        {
+            if (rcStrict == VINF_SUCCESS && pVCpu->cpum.GstCtx.rip != uOldRip)
+                rcStrict = VINF_EM_DBG_STEPPED;
+            Log(("EMR3HmSingleInstruction: returns %Rrc (rip %llx -> %llx)\n", VBOXSTRICTRC_VAL(rcStrict), uOldRip, pVCpu->cpum.GstCtx.rip));
+            CPUM_IMPORT_EXTRN_RET(pVCpu, ~CPUMCTX_EXTRN_KEEPER_MASK);
+            return rcStrict;
+        }
+    }
+}
+
+
+/**
+ * Executes one (or perhaps a few more) instruction(s).
+ *
+ * @returns VBox status code suitable for EM.
+ *
+ * @param   pVM         The cross context VM structure.
+ * @param   pVCpu       The cross context virtual CPU structure.
+ * @param   rcRC        Return code from RC.
+ * @param   pszPrefix   Disassembly prefix. If not NULL we'll disassemble the
+ *                      instruction and prefix the log output with this text.
+ */
+#if defined(LOG_ENABLED) || defined(DOXYGEN_RUNNING)
+static int emR3HmExecuteInstructionWorker(PVM pVM, PVMCPU pVCpu, int rcRC, const char *pszPrefix)
+#else
+static int emR3HmExecuteInstructionWorker(PVM pVM, PVMCPU pVCpu, int rcRC)
+#endif
+{
+    RT_NOREF(rcRC, pVM);
+
+#ifdef LOG_ENABLED
+    /*
+     * Log it.
+     */
+    Log(("EMINS: %04x:%RGv RSP=%RGv\n", pVCpu->cpum.GstCtx.cs.Sel, (RTGCPTR)pVCpu->cpum.GstCtx.rip, (RTGCPTR)pVCpu->cpum.GstCtx.rsp));
+    if (pszPrefix)
+    {
+        DBGFR3_INFO_LOG(pVM, pVCpu, "cpumguest", pszPrefix);
+        DBGFR3_DISAS_INSTR_CUR_LOG(pVCpu, pszPrefix);
+    }
+#endif
+
+    /*
+     * Use IEM and fallback on REM if the functionality is missing.
+     * Once IEM gets mature enough, nothing should ever fall back.
+     */
+    STAM_PROFILE_START(&pVCpu->em.s.StatIEMEmu, a);
+    VBOXSTRICTRC rcStrict;
+    uint32_t     idxContinueExitRec = pVCpu->em.s.idxContinueExitRec;
+    RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
+    if (idxContinueExitRec >= RT_ELEMENTS(pVCpu->em.s.aExitRecords))
+    {
+        CPUM_IMPORT_EXTRN_RET(pVCpu, IEM_CPUMCTX_EXTRN_MUST_MASK);
+        rcStrict = VBOXSTRICTRC_TODO(IEMExecOne(pVCpu));
+    }
+    else
+    {
+        RT_UNTRUSTED_VALIDATED_FENCE();
+        rcStrict = EMHistoryExec(pVCpu, &pVCpu->em.s.aExitRecords[idxContinueExitRec], 0);
+        LogFlow(("emR3HmExecuteInstruction: %Rrc (EMHistoryExec)\n", VBOXSTRICTRC_VAL(rcStrict)));
+    }
+    STAM_PROFILE_STOP(&pVCpu->em.s.StatIEMEmu, a);
+
+    return VBOXSTRICTRC_TODO(rcStrict);
+}
+
+
+/**
+ * Executes one (or perhaps a few more) instruction(s).
+ * This is just a wrapper for discarding pszPrefix in non-logging builds.
+ *
+ * @returns VBox status code suitable for EM.
+ * @param   pVM         The cross context VM structure.
+ * @param   pVCpu       The cross context virtual CPU structure.
+ * @param   pszPrefix   Disassembly prefix. If not NULL we'll disassemble the
+ *                      instruction and prefix the log output with this text.
+ * @param   rcGC        GC return code
+ */
+DECLINLINE(int) emR3HmExecuteInstruction(PVM pVM, PVMCPU pVCpu, const char *pszPrefix, int rcGC)
+{
+#ifdef LOG_ENABLED
+    return emR3HmExecuteInstructionWorker(pVM, pVCpu, rcGC, pszPrefix);
+#else
+    RT_NOREF_PV(pszPrefix);
+    return emR3HmExecuteInstructionWorker(pVM, pVCpu, rcGC);
+#endif
+}
+
+
+/**
+ * Executes one (or perhaps a few more) IO instruction(s).
+ *
+ * @returns VBox status code suitable for EM.
+ * @param   pVM         The cross context VM structure.
+ * @param   pVCpu       The cross context virtual CPU structure.
+ */
+static int emR3HmExecuteIOInstruction(PVM pVM, PVMCPU pVCpu)
+{
+    RT_NOREF(pVM);
+    STAM_PROFILE_START(&pVCpu->em.s.StatIOEmu, a);
+
+    VBOXSTRICTRC rcStrict;
+    uint32_t     idxContinueExitRec = pVCpu->em.s.idxContinueExitRec;
+    RT_UNTRUSTED_NONVOLATILE_COPY_FENCE();
+    if (idxContinueExitRec >= RT_ELEMENTS(pVCpu->em.s.aExitRecords))
+    {
+        /*
+         * Hand it over to the interpreter.
+         */
+        CPUM_IMPORT_EXTRN_RET(pVCpu, IEM_CPUMCTX_EXTRN_MUST_MASK);
+        rcStrict = IEMExecOne(pVCpu);
+        LogFlow(("emR3HmExecuteIOInstruction: %Rrc\n", VBOXSTRICTRC_VAL(rcStrict)));
+    }
+    else
+    {
+        RT_UNTRUSTED_VALIDATED_FENCE();
+        CPUM_IMPORT_EXTRN_RET(pVCpu, IEM_CPUMCTX_EXTRN_MUST_MASK);
+        rcStrict = EMHistoryExec(pVCpu, &pVCpu->em.s.aExitRecords[idxContinueExitRec], 0);
+        LogFlow(("emR3HmExecuteIOInstruction: %Rrc (EMHistoryExec)\n", VBOXSTRICTRC_VAL(rcStrict)));
+        STAM_COUNTER_INC(&pVCpu->em.s.CTX_SUFF(pStats)->StatIoRestarted);
+    }
+
+    STAM_COUNTER_INC(&pVCpu->em.s.CTX_SUFF(pStats)->StatIoIem);
+    STAM_PROFILE_STOP(&pVCpu->em.s.StatIOEmu, a);
+    return VBOXSTRICTRC_TODO(rcStrict);
+}
+
+
+/**
+ * Process HM specific forced actions.
+ *
+ * This function is called when any FFs in the VM_FF_HIGH_PRIORITY_PRE_RAW_MASK
+ * or/and VMCPU_FF_HIGH_PRIORITY_PRE_RAW_MASK are pending.
+ *
+ * @returns VBox status code. May return VINF_EM_NO_MEMORY but none of the other
+ *          EM statuses.
+ * @param   pVM         The cross context VM structure.
+ * @param   pVCpu       The cross context virtual CPU structure.
+ */
+static int emR3HmForcedActions(PVM pVM, PVMCPU pVCpu)
+{
+    /*
+     * Sync page directory.
+     */
+    if (VMCPU_FF_IS_ANY_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3 | VMCPU_FF_PGM_SYNC_CR3_NON_GLOBAL))
+    {
+        CPUM_IMPORT_EXTRN_RET(pVCpu, CPUMCTX_EXTRN_CR0 | CPUMCTX_EXTRN_CR3 | CPUMCTX_EXTRN_CR4);
+        Assert(pVCpu->em.s.enmState != EMSTATE_WAIT_SIPI);
+        int rc = PGMSyncCR3(pVCpu, pVCpu->cpum.GstCtx.cr0, pVCpu->cpum.GstCtx.cr3, pVCpu->cpum.GstCtx.cr4, VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3));
+        if (RT_FAILURE(rc))
+            return rc;
+
+        /* Prefetch pages for EIP and ESP. */
+        /** @todo This is rather expensive. Should investigate if it really helps at all. */
+        /** @todo this should be skipped! */
+        CPUM_IMPORT_EXTRN_RET(pVCpu, CPUMCTX_EXTRN_CS | CPUMCTX_EXTRN_SS);
+        rc = PGMPrefetchPage(pVCpu, SELMToFlat(pVM, DISSELREG_CS, CPUMCTX2CORE(&pVCpu->cpum.GstCtx), pVCpu->cpum.GstCtx.rip));
+        if (rc == VINF_SUCCESS)
+            rc = PGMPrefetchPage(pVCpu, SELMToFlat(pVM, DISSELREG_SS, CPUMCTX2CORE(&pVCpu->cpum.GstCtx), pVCpu->cpum.GstCtx.rsp));
+        if (rc != VINF_SUCCESS)
+        {
+            if (rc != VINF_PGM_SYNC_CR3)
+            {
+                AssertLogRelMsgReturn(RT_FAILURE(rc), ("%Rrc\n", rc), VERR_IPE_UNEXPECTED_INFO_STATUS);
+                return rc;
+            }
+            rc = PGMSyncCR3(pVCpu, pVCpu->cpum.GstCtx.cr0, pVCpu->cpum.GstCtx.cr3, pVCpu->cpum.GstCtx.cr4, VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3));
+            if (RT_FAILURE(rc))
+                return rc;
+        }
+        /** @todo maybe prefetch the supervisor stack page as well */
+    }
+
+    /*
+     * Allocate handy pages (just in case the above actions have consumed some pages).
+     */
+    if (VM_FF_IS_PENDING_EXCEPT(pVM, VM_FF_PGM_NEED_HANDY_PAGES, VM_FF_PGM_NO_MEMORY))
+    {
+        int rc = PGMR3PhysAllocateHandyPages(pVM);
+        if (RT_FAILURE(rc))
+            return rc;
+    }
+
+    /*
+     * Check whether we're out of memory now.
+     *
+     * This may stem from some of the above actions or operations that has been executed
+     * since we ran FFs. The allocate handy pages must for instance always be followed by
+     * this check.
+     */
+    if (VM_FF_IS_SET(pVM, VM_FF_PGM_NO_MEMORY))
+        return VINF_EM_NO_MEMORY;
+
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Executes hardware accelerated raw code. (Intel VT-x & AMD-V)
+ *
+ * This function contains the raw-mode version of the inner
+ * execution loop (the outer loop being in EMR3ExecuteVM()).
+ *
+ * @returns VBox status code. The most important ones are: VINF_EM_RESCHEDULE, VINF_EM_RESCHEDULE_RAW,
+ *          VINF_EM_RESCHEDULE_REM, VINF_EM_SUSPEND, VINF_EM_RESET and VINF_EM_TERMINATE.
+ *
+ * @param   pVM         The cross context VM structure.
+ * @param   pVCpu       The cross context virtual CPU structure.
+ * @param   pfFFDone    Where to store an indicator telling whether or not
+ *                      FFs were done before returning.
+ */
+int emR3HmExecute(PVM pVM, PVMCPU pVCpu, bool *pfFFDone)
+{
+    int      rc = VERR_IPE_UNINITIALIZED_STATUS;
+
+    LogFlow(("emR3HmExecute%d: (cs:eip=%04x:%RGv)\n", pVCpu->idCpu, pVCpu->cpum.GstCtx.cs.Sel, (RTGCPTR)pVCpu->cpum.GstCtx.rip));
+    *pfFFDone = false;
+
+    STAM_COUNTER_INC(&pVCpu->em.s.StatHMExecuteCalled);
+
+    /*
+     * Spin till we get a forced action which returns anything but VINF_SUCCESS.
+     */
+    for (;;)
+    {
+        STAM_PROFILE_ADV_START(&pVCpu->em.s.StatHMEntry, a);
+
+        /* Check if a forced reschedule is pending. */
+        if (HMR3IsRescheduleRequired(pVM, &pVCpu->cpum.GstCtx))
+        {
+            rc = VINF_EM_RESCHEDULE;
+            break;
+        }
+
+        /*
+         * Process high priority pre-execution raw-mode FFs.
+         */
+        if (    VM_FF_IS_ANY_SET(pVM, VM_FF_HIGH_PRIORITY_PRE_RAW_MASK)
+            ||  VMCPU_FF_IS_ANY_SET(pVCpu, VMCPU_FF_HIGH_PRIORITY_PRE_RAW_MASK))
+        {
+            rc = emR3HmForcedActions(pVM, pVCpu);
+            if (rc != VINF_SUCCESS)
+                break;
+        }
+
+#ifdef LOG_ENABLED
+        /*
+         * Log important stuff before entering GC.
+         */
+        if (TRPMHasTrap(pVCpu))
+            Log(("CPU%d: Pending hardware interrupt=0x%x cs:rip=%04X:%RGv\n", pVCpu->idCpu, TRPMGetTrapNo(pVCpu), pVCpu->cpum.GstCtx.cs.Sel, (RTGCPTR)pVCpu->cpum.GstCtx.rip));
+
+        uint32_t cpl = CPUMGetGuestCPL(pVCpu);
+        if (pVM->cCpus == 1)
+        {
+            if (pVCpu->cpum.GstCtx.eflags.Bits.u1VM)
+                Log(("HWV86: %08X IF=%d\n", pVCpu->cpum.GstCtx.eip, pVCpu->cpum.GstCtx.eflags.Bits.u1IF));
+            else if (CPUMIsGuestIn64BitCodeEx(&pVCpu->cpum.GstCtx))
+                Log(("HWR%d: %04X:%RGv ESP=%RGv IF=%d IOPL=%d CR0=%x CR4=%x EFER=%x\n", cpl, pVCpu->cpum.GstCtx.cs.Sel, (RTGCPTR)pVCpu->cpum.GstCtx.rip, pVCpu->cpum.GstCtx.rsp, pVCpu->cpum.GstCtx.eflags.Bits.u1IF, pVCpu->cpum.GstCtx.eflags.Bits.u2IOPL, (uint32_t)pVCpu->cpum.GstCtx.cr0, (uint32_t)pVCpu->cpum.GstCtx.cr4, (uint32_t)pVCpu->cpum.GstCtx.msrEFER));
+            else
+                Log(("HWR%d: %04X:%08X ESP=%08X IF=%d IOPL=%d CR0=%x CR4=%x EFER=%x\n", cpl, pVCpu->cpum.GstCtx.cs.Sel,          pVCpu->cpum.GstCtx.eip, pVCpu->cpum.GstCtx.esp, pVCpu->cpum.GstCtx.eflags.Bits.u1IF, pVCpu->cpum.GstCtx.eflags.Bits.u2IOPL, (uint32_t)pVCpu->cpum.GstCtx.cr0, (uint32_t)pVCpu->cpum.GstCtx.cr4, (uint32_t)pVCpu->cpum.GstCtx.msrEFER));
+        }
+        else
+        {
+            if (pVCpu->cpum.GstCtx.eflags.Bits.u1VM)
+                Log(("HWV86-CPU%d: %08X IF=%d\n", pVCpu->idCpu, pVCpu->cpum.GstCtx.eip, pVCpu->cpum.GstCtx.eflags.Bits.u1IF));
+            else if (CPUMIsGuestIn64BitCodeEx(&pVCpu->cpum.GstCtx))
+                Log(("HWR%d-CPU%d: %04X:%RGv ESP=%RGv IF=%d IOPL=%d CR0=%x CR4=%x EFER=%x\n", cpl, pVCpu->idCpu, pVCpu->cpum.GstCtx.cs.Sel, (RTGCPTR)pVCpu->cpum.GstCtx.rip, pVCpu->cpum.GstCtx.rsp, pVCpu->cpum.GstCtx.eflags.Bits.u1IF, pVCpu->cpum.GstCtx.eflags.Bits.u2IOPL, (uint32_t)pVCpu->cpum.GstCtx.cr0, (uint32_t)pVCpu->cpum.GstCtx.cr4, (uint32_t)pVCpu->cpum.GstCtx.msrEFER));
+            else
+                Log(("HWR%d-CPU%d: %04X:%08X ESP=%08X IF=%d IOPL=%d CR0=%x CR4=%x EFER=%x\n", cpl, pVCpu->idCpu, pVCpu->cpum.GstCtx.cs.Sel,          pVCpu->cpum.GstCtx.eip, pVCpu->cpum.GstCtx.esp, pVCpu->cpum.GstCtx.eflags.Bits.u1IF, pVCpu->cpum.GstCtx.eflags.Bits.u2IOPL, (uint32_t)pVCpu->cpum.GstCtx.cr0, (uint32_t)pVCpu->cpum.GstCtx.cr4, (uint32_t)pVCpu->cpum.GstCtx.msrEFER));
+        }
+#endif /* LOG_ENABLED */
+
+        /*
+         * Execute the code.
+         */
+        STAM_PROFILE_ADV_STOP(&pVCpu->em.s.StatHMEntry, a);
+
+        if (RT_LIKELY(emR3IsExecutionAllowed(pVM, pVCpu)))
+        {
+            STAM_PROFILE_START(&pVCpu->em.s.StatHMExec, x);
+            rc = VMMR3HmRunGC(pVM, pVCpu);
+            STAM_PROFILE_STOP(&pVCpu->em.s.StatHMExec, x);
+        }
+        else
+        {
+            /* Give up this time slice; virtual time continues */
+            STAM_REL_PROFILE_ADV_START(&pVCpu->em.s.StatCapped, u);
+            RTThreadSleep(5);
+            STAM_REL_PROFILE_ADV_STOP(&pVCpu->em.s.StatCapped, u);
+            rc = VINF_SUCCESS;
+        }
+
+
+        /*
+         * Deal with high priority post execution FFs before doing anything else.
+         */
+        VMCPU_FF_CLEAR_MASK(pVCpu, VMCPU_FF_RESUME_GUEST_MASK);
+        if (    VM_FF_IS_ANY_SET(pVM, VM_FF_HIGH_PRIORITY_POST_MASK)
+            ||  VMCPU_FF_IS_ANY_SET(pVCpu, VMCPU_FF_HIGH_PRIORITY_POST_MASK))
+            rc = VBOXSTRICTRC_TODO(emR3HighPriorityPostForcedActions(pVM, pVCpu, rc));
+
+        /*
+         * Process the returned status code.
+         */
+        if (rc >= VINF_EM_FIRST && rc <= VINF_EM_LAST)
+            break;
+
+        rc = emR3HmHandleRC(pVM, pVCpu, rc);
+        if (rc != VINF_SUCCESS)
+            break;
+
+        /*
+         * Check and execute forced actions.
+         */
+#ifdef VBOX_HIGH_RES_TIMERS_HACK
+        TMTimerPollVoid(pVM, pVCpu);
+#endif
+        if (    VM_FF_IS_ANY_SET(pVM, VM_FF_ALL_MASK)
+            ||  VMCPU_FF_IS_ANY_SET(pVCpu, VMCPU_FF_ALL_MASK))
+        {
+            rc = emR3ForcedActions(pVM, pVCpu, rc);
+            VBOXVMM_EM_FF_ALL_RET(pVCpu, rc);
+            if (    rc != VINF_SUCCESS
+                &&  rc != VINF_EM_RESCHEDULE_HM)
+            {
+                *pfFFDone = true;
+                break;
+            }
+        }
+    }
+
+    /*
+     * Return to outer loop.
+     */
+#if defined(LOG_ENABLED) && defined(DEBUG)
+    RTLogFlush(NULL);
+#endif
+    return rc;
+}
+