Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg

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

1 files changed, 1021 insertions, 0 deletions

diff --git a/src/VBox/Runtime/testcase/tstRTR0Timer.cpp b/src/VBox/Runtime/testcase/tstRTR0Timer.cpp
new file mode 100644
index 00000000..c4b8b5f3
--- /dev/null
+++ b/src/VBox/Runtime/testcase/tstRTR0Timer.cpp
@@ -0,0 +1,1021 @@
+/* $Id: tstRTR0Timer.cpp $ */
+/** @file
+ * IPRT R0 Testcase - Timers.
+ */
+
+/*
+ * Copyright (C) 2009-2023 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>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/timer.h>
+
+#include <iprt/asm.h>
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/cpuset.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/mp.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+#include <VBox/sup.h>
+#include "tstRTR0Timer.h"
+#include "tstRTR0Common.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+typedef struct
+{
+    /** Array of nano second timestamp of the first few shots. */
+    uint64_t volatile   aShotNsTSes[10];
+    /** The number of shots. */
+    uint32_t volatile   cShots;
+    /** The shot at which action is to be taken. */
+    uint32_t            iActionShot;
+    /** The RC of whatever operation performed in the handler. */
+    int volatile        rc;
+    /** Set if it's a periodic test. */
+    bool                fPeriodic;
+    /** Test specific stuff. */
+    union
+    {
+        /** tstRTR0TimerCallbackU32ChangeInterval parameters.  */
+        struct
+        {
+            /** The interval change step. */
+            uint32_t            cNsChangeStep;
+            /** The current timer interval. */
+            uint32_t            cNsCurInterval;
+            /** The minimum interval. */
+            uint32_t            cNsMinInterval;
+            /** The maximum interval. */
+            uint32_t            cNsMaxInterval;
+            /** Direction flag; false = decrement, true = increment. */
+            bool                fDirection;
+            /** The number of steps between each change. */
+            uint8_t             cStepsBetween;
+        } ChgInt;
+        /** tstRTR0TimerCallbackSpecific parameters.  */
+        struct
+        {
+            /** The expected CPU. */
+            RTCPUID             idCpu;
+            /** Set if this failed. */
+            bool                fFailed;
+        } Specific;
+    } u;
+} TSTRTR0TIMERS1;
+typedef TSTRTR0TIMERS1 *PTSTRTR0TIMERS1;
+
+
+/**
+ * Per cpu state for an omni timer test.
+ */
+typedef struct TSTRTR0TIMEROMNI1
+{
+    /** When we started receiving timer callbacks on this CPU. */
+    uint64_t            u64Start;
+    /** When we received the last tick on this timer. */
+    uint64_t            u64Last;
+    /** The number of ticks received on this CPU. */
+    uint32_t volatile   cTicks;
+    uint32_t            u32Padding;
+} TSTRTR0TIMEROMNI1;
+typedef TSTRTR0TIMEROMNI1 *PTSTRTR0TIMEROMNI1;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * Latency data.
+ */
+static struct TSTRTR0TIMEROMNILATENCY
+{
+    /** The number of samples.  */
+    volatile uint32_t   cSamples;
+    uint32_t            auPadding[3];
+    struct
+    {
+        uint64_t        uTsc;
+        uint64_t        uNanoTs;
+    } aSamples[4096];
+} g_aOmniLatency[16];
+
+
+
+
+/**
+ * Callback for the omni timer latency test, adds a sample to g_aOmniLatency.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackLatencyOmni(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    RTCPUID             idCpu    = RTMpCpuId();
+    uint32_t            iCpu     = RTMpCpuIdToSetIndex(idCpu);
+    NOREF(pTimer); NOREF(pvUser); NOREF(iTick);
+
+    //RTR0TESTR0_CHECK_MSG(iCpu < RT_ELEMENTS(g_aOmniLatency), ("iCpu=%d idCpu=%u\n", iCpu, idCpu));
+    if (iCpu < RT_ELEMENTS(g_aOmniLatency))
+    {
+        uint32_t iSample = g_aOmniLatency[iCpu].cSamples;
+        if (iSample < RT_ELEMENTS(g_aOmniLatency[iCpu].aSamples))
+        {
+            g_aOmniLatency[iCpu].aSamples[iSample].uTsc    = ASMReadTSC();
+            g_aOmniLatency[iCpu].aSamples[iSample].uNanoTs = RTTimeSystemNanoTS();
+            g_aOmniLatency[iCpu].cSamples = iSample + 1;
+        }
+    }
+}
+
+
+/**
+ * Callback which increments a 32-bit counter.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackOmni(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    PTSTRTR0TIMEROMNI1  paStates = (PTSTRTR0TIMEROMNI1)pvUser;
+    RTCPUID             idCpu    = RTMpCpuId();
+    uint32_t            iCpu     = RTMpCpuIdToSetIndex(idCpu);
+    NOREF(pTimer);
+
+    RTR0TESTR0_CHECK_MSG(iCpu < RTCPUSET_MAX_CPUS, ("iCpu=%d idCpu=%u\n", iCpu, idCpu));
+    if (iCpu < RTCPUSET_MAX_CPUS)
+    {
+        uint32_t iCountedTick = ASMAtomicIncU32(&paStates[iCpu].cTicks);
+        RTR0TESTR0_CHECK_MSG(iCountedTick == iTick,
+                             ("iCountedTick=%u iTick=%u iCpu=%d idCpu=%u\n", iCountedTick, iTick, iCpu, idCpu));
+        paStates[iCpu].u64Last = RTTimeSystemNanoTS();
+        if (!paStates[iCpu].u64Start)
+        {
+            paStates[iCpu].u64Start = paStates[iCpu].u64Last;
+            RTR0TESTR0_CHECK_MSG(iCountedTick == 1, ("iCountedTick=%u iCpu=%d idCpu=%u\n", iCountedTick, iCpu, idCpu));
+        }
+    }
+}
+
+
+/**
+ * Callback for one-shot resolution detection.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      Points to variable with the start TS, update to time
+ *                      elapsed till this call.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackOneShotElapsed(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    RT_NOREF(pTimer, iTick);
+    uint64_t *puNanoTS = (uint64_t *)pvUser;
+    *puNanoTS = RTTimeSystemNanoTS() - *puNanoTS;
+}
+
+
+/**
+ * Callback which increments a 32-bit counter.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackSpecific(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    PTSTRTR0TIMERS1 pState = (PTSTRTR0TIMERS1)pvUser;
+    uint32_t        iShot  = ASMAtomicIncU32(&pState->cShots);
+    NOREF(pTimer);
+
+    if (iShot <= RT_ELEMENTS(pState->aShotNsTSes))
+        pState->aShotNsTSes[iShot - 1] = RTTimeSystemNanoTS();
+
+    RTCPUID idCpu = RTMpCpuId();
+    if (pState->u.Specific.idCpu != idCpu)
+        pState->u.Specific.fFailed = true;
+    RTR0TESTR0_CHECK_MSG(pState->u.Specific.idCpu == idCpu, ("idCpu=%u, expected %u\n", idCpu, pState->u.Specific.idCpu));
+
+    if (pState->fPeriodic)
+        RTR0TESTR0_CHECK_MSG(iShot == iTick, ("iShot=%u iTick=%u\n", iShot, iTick));
+    else
+        RTR0TESTR0_CHECK_MSG(iTick == 1, ("iShot=%u iTick=%u\n", iShot, iTick));
+}
+
+
+/**
+ * Callback which changes the interval at each invocation.
+ *
+ * The changes are governed by TSTRTR0TIMERS1::ChangeInterval.  The callback
+ * calls RTTimerStop at iActionShot.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackChangeInterval(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    PTSTRTR0TIMERS1 pState = (PTSTRTR0TIMERS1)pvUser;
+    uint32_t        iShot  = ASMAtomicIncU32(&pState->cShots) - 1;
+
+    if (iShot < RT_ELEMENTS(pState->aShotNsTSes))
+        pState->aShotNsTSes[iShot] = RTTimeSystemNanoTS();
+    if (pState->fPeriodic)
+        RTR0TESTR0_CHECK_MSG(iShot + 1 == iTick, ("iShot=%u iTick=%u\n", iShot, iTick));
+    else
+        RTR0TESTR0_CHECK_MSG(iTick == 1, ("iShot=%u iTick=%u\n", iShot, iTick));
+
+    if (!(iShot % pState->u.ChgInt.cStepsBetween))
+    {
+        if (pState->u.ChgInt.fDirection)
+        {
+            pState->u.ChgInt.cNsCurInterval += pState->u.ChgInt.cNsChangeStep;
+            if (   pState->u.ChgInt.cNsCurInterval > pState->u.ChgInt.cNsMaxInterval
+                || pState->u.ChgInt.cNsCurInterval < pState->u.ChgInt.cNsMinInterval
+                || !pState->u.ChgInt.cNsCurInterval)
+            {
+                pState->u.ChgInt.cNsCurInterval = pState->u.ChgInt.cNsMaxInterval;
+                pState->u.ChgInt.fDirection = false;
+            }
+        }
+        else
+        {
+            pState->u.ChgInt.cNsCurInterval -= pState->u.ChgInt.cNsChangeStep;
+            if (   pState->u.ChgInt.cNsCurInterval < pState->u.ChgInt.cNsMinInterval
+                || pState->u.ChgInt.cNsCurInterval > pState->u.ChgInt.cNsMaxInterval
+                || pState->u.ChgInt.cNsCurInterval)
+            {
+                pState->u.ChgInt.cNsCurInterval = pState->u.ChgInt.cNsMinInterval;
+                pState->u.ChgInt.fDirection = true;
+            }
+        }
+
+        RTR0TESTR0_CHECK_RC(RTTimerChangeInterval(pTimer, pState->u.ChgInt.cNsCurInterval), VINF_SUCCESS);
+    }
+
+    if (iShot == pState->iActionShot)
+        RTR0TESTR0_CHECK_RC(pState->rc = RTTimerStop(pTimer), VINF_SUCCESS);
+}
+
+
+/**
+ * Callback which increments destroy the timer when it fires.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackDestroyOnce(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    PTSTRTR0TIMERS1 pState = (PTSTRTR0TIMERS1)pvUser;
+    uint32_t        iShot  = ASMAtomicIncU32(&pState->cShots);
+
+    if (iShot <= RT_ELEMENTS(pState->aShotNsTSes))
+        pState->aShotNsTSes[iShot - 1] = RTTimeSystemNanoTS();
+    if (pState->fPeriodic)
+        RTR0TESTR0_CHECK_MSG(iShot == iTick, ("iShot=%u iTick=%u\n", iShot, iTick));
+    else
+        RTR0TESTR0_CHECK_MSG(iTick == 1, ("iShot=%u iTick=%u\n", iShot, iTick));
+
+    if (iShot == pState->iActionShot + 1)
+        RTR0TESTR0_CHECK_RC(pState->rc = RTTimerDestroy(pTimer), VINF_SUCCESS);
+}
+
+
+/**
+ * Callback which increments restarts a timer once.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackRestartOnce(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    PTSTRTR0TIMERS1 pState = (PTSTRTR0TIMERS1)pvUser;
+    uint32_t        iShot  = ASMAtomicIncU32(&pState->cShots);
+
+    if (iShot <= RT_ELEMENTS(pState->aShotNsTSes))
+        pState->aShotNsTSes[iShot - 1] = RTTimeSystemNanoTS();
+    if (pState->fPeriodic)
+        RTR0TESTR0_CHECK_MSG(iShot == iTick, ("iShot=%u iTick=%u\n", iShot, iTick));
+    else
+        RTR0TESTR0_CHECK_MSG(iTick == 1, ("iShot=%u iTick=%u\n", iShot, iTick));
+
+    if (iShot == pState->iActionShot + 1)
+        RTR0TESTR0_CHECK_RC(pState->rc = RTTimerStart(pTimer, 10000000 /* 10ms */), VINF_SUCCESS);
+}
+
+
+/**
+ * Callback which increments a 32-bit counter.
+ *
+ * @param   pTimer      The timer.
+ * @param   iTick       The current tick.
+ * @param   pvUser      The user argument.
+ */
+static DECLCALLBACK(void) tstRTR0TimerCallbackU32Counter(PRTTIMER pTimer, void *pvUser, uint64_t iTick)
+{
+    PTSTRTR0TIMERS1 pState = (PTSTRTR0TIMERS1)pvUser;
+    uint32_t        iShot  = ASMAtomicIncU32(&pState->cShots);
+    NOREF(pTimer);
+
+    if (iShot <= RT_ELEMENTS(pState->aShotNsTSes))
+        pState->aShotNsTSes[iShot - 1] = RTTimeSystemNanoTS();
+    if (pState->fPeriodic)
+        RTR0TESTR0_CHECK_MSG(iShot == iTick, ("iShot=%u iTick=%u\n", iShot, iTick));
+    else
+        RTR0TESTR0_CHECK_MSG(iTick == 1, ("iShot=%u iTick=%u\n", iShot, iTick));
+}
+
+
+#ifdef SOME_UNUSED_FUNCTION
+/**
+ * Checks that the interval between two timer shots are within the specified
+ * range.
+ *
+ * @returns 0 if ok, 1 if bad.
+ * @param   iShot               The shot number (for bitching).
+ * @param   uPrevTS             The time stamp of the previous shot (ns).
+ * @param   uThisTS             The timer stamp of this shot (ns).
+ * @param   uMin                The minimum interval (ns).
+ * @param   uMax                The maximum interval (ns).
+ */
+static int tstRTR0TimerCheckShotInterval(uint32_t iShot, uint64_t uPrevTS, uint64_t uThisTS, uint32_t uMin, uint32_t uMax)
+{
+    uint64_t uDelta = uThisTS - uPrevTS;
+    RTR0TESTR0_CHECK_MSG_RET(uDelta >= uMin, ("iShot=%u uDelta=%lld uMin=%u\n", iShot, uDelta, uMin), 1);
+    RTR0TESTR0_CHECK_MSG_RET(uDelta <= uMax, ("iShot=%u uDelta=%lld uMax=%u\n", iShot, uDelta, uMax), 1);
+    return 0;
+}
+#endif
+
+
+/**
+ * Checks that the interval between timer shots are within a certain range.
+ *
+ * @returns Number of violations (i.e. 0 is ok).
+ * @param   pState              The state.
+ * @param   uStartNsTS          The start time stamp (ns).
+ * @param   uMin                The minimum interval (ns).
+ * @param   uMax                The maximum interval (ns).
+ */
+static int tstRTR0TimerCheckShotIntervals(PTSTRTR0TIMERS1 pState, uint64_t uStartNsTS, uint32_t uMin, uint32_t uMax)
+{
+    uint64_t uMaxDelta = 0;
+    uint64_t uMinDelta = UINT64_MAX;
+    uint32_t cBadShots = 0;
+    uint32_t cShots    = pState->cShots;
+    uint64_t uPrevTS   = uStartNsTS;
+    for (uint32_t iShot = 0; iShot < cShots; iShot++)
+    {
+        uint64_t uThisTS = pState->aShotNsTSes[iShot];
+        uint64_t uDelta  = uThisTS - uPrevTS;
+        if (uDelta > uMaxDelta)
+            uMaxDelta = uDelta;
+        if (uDelta < uMinDelta)
+            uMinDelta = uDelta;
+        cBadShots += !(uDelta >= uMin && uDelta <= uMax);
+
+        RTR0TESTR0_CHECK_MSG(uDelta >= uMin, ("iShot=%u uDelta=%lld uMin=%u\n", iShot, uDelta, uMin));
+        RTR0TESTR0_CHECK_MSG(uDelta <= uMax, ("iShot=%u uDelta=%lld uMax=%u\n", iShot, uDelta, uMax));
+
+        uPrevTS = uThisTS;
+    }
+
+    RTR0TestR0Info("uMaxDelta=%llu uMinDelta=%llu\n", uMaxDelta, uMinDelta);
+    return cBadShots;
+}
+
+
+/**
+ * Service request callback function.
+ *
+ * @returns VBox status code.
+ * @param   pSession    The caller's session.
+ * @param   u64Arg      64-bit integer argument.
+ * @param   pReqHdr     The request header. Input / Output. Optional.
+ */
+DECLEXPORT(int) TSTRTR0TimerSrvReqHandler(PSUPDRVSESSION pSession, uint32_t uOperation,
+                                          uint64_t u64Arg, PSUPR0SERVICEREQHDR pReqHdr)
+{
+    RTR0TESTR0_SRV_REQ_PROLOG_RET(pReqHdr);
+    NOREF(pSession);
+
+    /*
+     * Common parameter and state variables.
+     */
+    uint32_t const cNsSysHz        = RTTimerGetSystemGranularity();
+    uint32_t const cNsMaxHighResHz = 10000; /** @todo need API for this */
+    TSTRTR0TIMERS1 State;
+    if (   cNsSysHz             < UINT32_C(1000)
+        || cNsSysHz             > UINT32_C(1000000000)
+        || cNsMaxHighResHz      < UINT32_C(1)
+        || cNsMaxHighResHz      > UINT32_C(1000000000))
+    {
+        RTR0TESTR0_CHECK_MSG(cNsSysHz        > UINT32_C(1000) && cNsSysHz     < UINT32_C(1000000000), ("%u", cNsSysHz));
+        RTR0TESTR0_CHECK_MSG(cNsMaxHighResHz > UINT32_C(1) && cNsMaxHighResHz < UINT32_C(1000000000), ("%u", cNsMaxHighResHz));
+        RTR0TESTR0_SRV_REQ_EPILOG(pReqHdr);
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * The big switch.
+     */
+    switch (uOperation)
+    {
+        RTR0TESTR0_IMPLEMENT_SANITY_CASES();
+        RTR0TESTR0_IMPLEMENT_DEFAULT_CASE(uOperation);
+
+        case TSTRTR0TIMER_ONE_SHOT_BASIC:
+        case TSTRTR0TIMER_ONE_SHOT_BASIC_HIRES:
+        {
+            /* Create a one-shot timer and take one shot. */
+            PRTTIMER pTimer;
+            uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            int rc = RTTimerCreateEx(&pTimer, 0, fFlags, tstRTR0TimerCallbackU32Counter, &State);
+            if (rc == VERR_NOT_SUPPORTED)
+            {
+                RTR0TestR0Info("one-shot timer are not supported, skipping\n");
+                RTR0TESTR0_SKIP();
+                break;
+            }
+            RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+            do /* break loop */
+            {
+                RT_ZERO(State); ASMAtomicWriteU32(&State.cShots, State.cShots);
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, 0), VINF_SUCCESS);
+                for (uint32_t i = 0; i < 1000 && !ASMAtomicUoReadU32(&State.cShots); i++)
+                    RTThreadSleep(5);
+                RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicUoReadU32(&State.cShots) == 1, ("cShots=%u\n", State.cShots));
+
+                /* check that it is restartable. */
+                RT_ZERO(State); ASMAtomicWriteU32(&State.cShots, State.cShots);
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, 0), VINF_SUCCESS);
+                for (uint32_t i = 0; i < 1000 && !ASMAtomicUoReadU32(&State.cShots); i++)
+                    RTThreadSleep(5);
+                RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicUoReadU32(&State.cShots) == 1, ("cShots=%u\n", State.cShots));
+
+                /* check that it respects the timeout value and can be cancelled. */
+                RT_ZERO(State); ASMAtomicWriteU32(&State.cShots, State.cShots);
+                RTR0TESTR0_CHECK_RC(RTTimerStart(pTimer, 5*UINT64_C(1000000000)), VINF_SUCCESS);
+                RTR0TESTR0_CHECK_RC(RTTimerStop(pTimer), VINF_SUCCESS);
+                RTThreadSleep(1);
+                RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicUoReadU32(&State.cShots) == 0, ("cShots=%u\n", State.cShots));
+
+                /* Check some double starts and stops (shall not assert). */
+                RT_ZERO(State); ASMAtomicWriteU32(&State.cShots, State.cShots);
+                RTR0TESTR0_CHECK_RC(RTTimerStart(pTimer, 5*UINT64_C(1000000000)), VINF_SUCCESS);
+                RTR0TESTR0_CHECK_RC(RTTimerStart(pTimer, 0), VERR_TIMER_ACTIVE);
+                RTR0TESTR0_CHECK_RC(RTTimerStop(pTimer), VINF_SUCCESS);
+                RTR0TESTR0_CHECK_RC(RTTimerStop(pTimer), VERR_TIMER_SUSPENDED);
+                RTThreadSleep(1);
+                RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicUoReadU32(&State.cShots) == 0, ("cShots=%u\n", State.cShots));
+            } while (0);
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(NULL), VINF_SUCCESS);
+            break;
+        }
+
+        case TSTRTR0TIMER_ONE_SHOT_RESTART:
+        case TSTRTR0TIMER_ONE_SHOT_RESTART_HIRES:
+        {
+#if !defined(RT_OS_SOLARIS) /* Not expected to work on all hosts. */
+            /* Create a one-shot timer and restart it in the callback handler. */
+            PRTTIMER pTimer;
+            uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            for (uint32_t iTest = 0; iTest < 2; iTest++)
+            {
+                int rc = RTTimerCreateEx(&pTimer, 0, fFlags, tstRTR0TimerCallbackRestartOnce, &State);
+                if (rc == VERR_NOT_SUPPORTED)
+                {
+                    RTR0TestR0Info("one-shot timer are not supported, skipping\n");
+                    RTR0TESTR0_SKIP();
+                    break;
+                }
+                RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+                RT_ZERO(State);
+                State.iActionShot = 0;
+                ASMAtomicWriteU32(&State.cShots, State.cShots);
+                do /* break loop */
+                {
+                    RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, cNsSysHz * iTest), VINF_SUCCESS);
+                    for (uint32_t i = 0; i < 1000 && ASMAtomicUoReadU32(&State.cShots) < 2; i++)
+                        RTThreadSleep(5);
+                    RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicUoReadU32(&State.cShots) == 2, ("cShots=%u\n", State.cShots));
+                } while (0);
+                RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            }
+#else
+            RTR0TestR0Info("restarting from callback not supported on this platform\n");
+            RTR0TESTR0_SKIP();
+#endif
+            break;
+        }
+
+        case TSTRTR0TIMER_ONE_SHOT_DESTROY:
+        case TSTRTR0TIMER_ONE_SHOT_DESTROY_HIRES:
+        {
+#if !defined(RT_OS_SOLARIS) && !defined(RT_OS_WINDOWS) /* Not expected to work on all hosts. */
+            /* Create a one-shot timer and destroy it in the callback handler. */
+            PRTTIMER pTimer;
+            uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            for (uint32_t iTest = 0; iTest < 2; iTest++)
+            {
+                int rc = RTTimerCreateEx(&pTimer, 0, fFlags, tstRTR0TimerCallbackDestroyOnce, &State);
+                if (rc == VERR_NOT_SUPPORTED)
+                {
+                    RTR0TestR0Info("one-shot timer are not supported, skipping\n");
+                    RTR0TESTR0_SKIP();
+                    break;
+                }
+                RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+                RT_ZERO(State);
+                State.rc = VERR_IPE_UNINITIALIZED_STATUS;
+                State.iActionShot = 0;
+                ASMAtomicWriteU32(&State.cShots, State.cShots);
+                do /* break loop */
+                {
+                    RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, cNsSysHz * iTest), VINF_SUCCESS);
+                    for (uint32_t i = 0; i < 1000 && (ASMAtomicUoReadU32(&State.cShots) < 1 || State.rc == VERR_IPE_UNINITIALIZED_STATUS); i++)
+                        RTThreadSleep(5);
+                    RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicReadU32(&State.cShots) == 1, ("cShots=%u\n", State.cShots));
+                    RTR0TESTR0_CHECK_MSG_BREAK(State.rc == VINF_SUCCESS, ("rc=%Rrc\n", State.rc));
+                } while (0);
+                if (RT_FAILURE(State.rc))
+                    RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            }
+#else
+            RTR0TestR0Info("destroying from callback not supported on this platform\n");
+            RTR0TESTR0_SKIP();
+#endif
+            break;
+        }
+
+        case TSTRTR0TIMER_ONE_SHOT_SPECIFIC:
+        case TSTRTR0TIMER_ONE_SHOT_SPECIFIC_HIRES:
+        {
+            PRTTIMER pTimer = NULL;
+            RTCPUSET OnlineSet;
+            RTMpGetOnlineSet(&OnlineSet);
+            for (uint32_t iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
+                if (RTCpuSetIsMemberByIndex(&OnlineSet, iCpu))
+                {
+                    RT_ZERO(State);
+                    State.iActionShot       = 0;
+                    State.rc                = VINF_SUCCESS;
+                    State.u.Specific.idCpu  = RTMpCpuIdFromSetIndex(iCpu);
+                    ASMAtomicWriteU32(&State.cShots, State.cShots);
+
+                    uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+                    fFlags |= RTTIMER_FLAGS_CPU(iCpu);
+                    int rc = RTTimerCreateEx(&pTimer, 0, fFlags, tstRTR0TimerCallbackSpecific, &State);
+                    if (rc == VERR_NOT_SUPPORTED)
+                    {
+                        RTR0TestR0Info("one-shot specific timer are not supported, skipping\n");
+                        RTR0TESTR0_SKIP();
+                        break;
+                    }
+                    RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+                    for (uint32_t i = 0; i < 5 && !RTR0TestR0HaveErrors(); i++)
+                    {
+                        ASMAtomicWriteU32(&State.cShots, 0);
+                        RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, (i & 2 ? cNsSysHz : cNsSysHz / 2) * (i & 1)), VINF_SUCCESS);
+                        uint64_t cNsElapsed = RTTimeSystemNanoTS();
+                        for (uint32_t j = 0; j < 1000 && ASMAtomicUoReadU32(&State.cShots) < 1; j++)
+                            RTThreadSleep(5);
+                        cNsElapsed = RTTimeSystemNanoTS() - cNsElapsed;
+                        RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicReadU32(&State.cShots) == 1,
+                                                   ("cShots=%u iCpu=%u i=%u iCurCpu=%u cNsElapsed=%'llu\n",
+                                                    State.cShots, iCpu, i, RTMpCpuIdToSetIndex(RTMpCpuId()), cNsElapsed ));
+                        RTR0TESTR0_CHECK_MSG_BREAK(State.rc == VINF_SUCCESS, ("rc=%Rrc\n", State.rc));
+                        RTR0TESTR0_CHECK_MSG_BREAK(!State.u.Specific.fFailed, ("iCpu=%u i=%u\n", iCpu, i));
+                    }
+
+                    RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+                    pTimer = NULL;
+                    if (RTR0TestR0HaveErrors())
+                        break;
+
+                    RTMpGetOnlineSet(&OnlineSet);
+                }
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            break;
+        }
+
+        case TSTRTR0TIMER_ONE_SHOT_RESOLUTION:
+        case TSTRTR0TIMER_ONE_SHOT_RESOLUTION_HIRES:
+        {
+            /* Just create a timer and do a number of RTTimerStart with a small
+               interval and see how quickly it gets called. */
+            PRTTIMER  pTimer;
+            uint32_t  fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            uint64_t  volatile cNsElapsed = 0;
+            RTR0TESTR0_CHECK_RC_BREAK(RTTimerCreateEx(&pTimer, 0, fFlags, tstRTR0TimerCallbackOneShotElapsed, (void *)&cNsElapsed),
+                                      VINF_SUCCESS);
+
+            uint32_t cTotal   = 0;
+            uint32_t cNsTotal = 0;
+            uint32_t cNsMin   = UINT32_MAX;
+            uint32_t cNsMax   = 0;
+            for (uint32_t i = 0; i < 200; i++)
+            {
+                cNsElapsed = RTTimeSystemNanoTS();
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, RT_NS_1US), VINF_SUCCESS);
+                RTThreadSleep(10);
+                cTotal   += 1;
+                cNsTotal += cNsElapsed;
+                if (cNsMin > cNsElapsed)
+                    cNsMin = cNsElapsed;
+                if (cNsMax < cNsElapsed)
+                    cNsMax = cNsElapsed;
+            }
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            pTimer = NULL;
+            RTR0TestR0Info("nsMin=%u nsAvg=%u nsMax=%u cTotal=%u\n", cNsMin, cNsTotal / cTotal, cNsMax, cTotal);
+            break;
+        }
+
+        case TSTRTR0TIMER_PERIODIC_BASIC:
+        case TSTRTR0TIMER_PERIODIC_BASIC_HIRES:
+        {
+            /* Create a periodic timer running at 10 HZ. */
+            uint32_t const  u10HzAsNs    = RT_NS_1SEC / 10;
+            uint32_t const  u10HzAsNsMin = u10HzAsNs - u10HzAsNs / 2;
+            uint32_t const  u10HzAsNsMax = u10HzAsNs + u10HzAsNs / 2;
+            PRTTIMER        pTimer;
+            uint32_t        fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            RTR0TESTR0_CHECK_RC_BREAK(RTTimerCreateEx(&pTimer, u10HzAsNs, fFlags, tstRTR0TimerCallbackU32Counter, &State),
+                                      VINF_SUCCESS);
+
+            for (uint32_t iTest = 0; iTest < 2; iTest++)
+            {
+                RT_ZERO(State);
+                State.fPeriodic = true;
+                ASMAtomicWriteU32(&State.cShots, State.cShots);
+
+                uint64_t uStartNsTS = RTTimeSystemNanoTS();
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, u10HzAsNs), VINF_SUCCESS);
+                for (uint32_t i = 0; i < 1000 && ASMAtomicUoReadU32(&State.cShots) < 10; i++)
+                    RTThreadSleep(10);
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStop(pTimer), VINF_SUCCESS);
+                RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicUoReadU32(&State.cShots) == 10, ("cShots=%u\n", State.cShots));
+                if (tstRTR0TimerCheckShotIntervals(&State, uStartNsTS, u10HzAsNsMin, u10HzAsNsMax))
+                    break;
+                RTThreadSleep(1); /** @todo RTTimerStop doesn't currently make sure the timer callback not is running
+                                   *        before returning on windows, linux (low res) and possible other plaforms. */
+            }
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(NULL), VINF_SUCCESS);
+            break;
+        }
+
+        case TSTRTR0TIMER_PERIODIC_CSSD_LOOPS:
+        case TSTRTR0TIMER_PERIODIC_CSSD_LOOPS_HIRES:
+        {
+            /* create, start, stop & destroy high res timers a number of times. */
+            uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            for (uint32_t i = 0; i < 40; i++)
+            {
+                PRTTIMER pTimer;
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerCreateEx(&pTimer, cNsSysHz, fFlags, tstRTR0TimerCallbackU32Counter, &State),
+                                          VINF_SUCCESS);
+                for (uint32_t j = 0; j < 10; j++)
+                {
+                    RT_ZERO(State);
+                    State.fPeriodic = true;
+                    ASMAtomicWriteU32(&State.cShots, State.cShots); /* ordered, necessary? */
+
+                    RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, i < 20 ? 0 : cNsSysHz), VINF_SUCCESS);
+                    for (uint32_t k = 0; k < 1000 && ASMAtomicUoReadU32(&State.cShots) < 2; k++)
+                        RTThreadSleep(1);
+                    RTR0TESTR0_CHECK_RC_BREAK(RTTimerStop(pTimer), VINF_SUCCESS);
+                    RTThreadSleep(1); /** @todo RTTimerStop doesn't currently make sure the timer callback not is running
+                                       *        before returning on windows, linux (low res) and possible other plaforms. */
+                }
+                RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            }
+            break;
+        }
+
+        case TSTRTR0TIMER_PERIODIC_CHANGE_INTERVAL:
+        case TSTRTR0TIMER_PERIODIC_CHANGE_INTERVAL_HIRES:
+        {
+            /* Initialize the test parameters, using the u64Arg value for selecting variations.  */
+            RT_ZERO(State);
+            State.cShots        = 0;
+            State.rc            = VERR_IPE_UNINITIALIZED_STATUS;
+            State.iActionShot   = 42;
+            State.fPeriodic     = true;
+            State.u.ChgInt.fDirection     = !!(u64Arg & 1);
+            if (uOperation == TSTRTR0TIMER_PERIODIC_CHANGE_INTERVAL_HIRES)
+            {
+                State.u.ChgInt.cNsMaxInterval = RT_MAX(cNsMaxHighResHz * 10, 20000000); /* 10x / 20 ms */
+                State.u.ChgInt.cNsMinInterval = RT_MAX(cNsMaxHighResHz,         10000); /* min / 10 us */
+            }
+            else
+            {
+                State.u.ChgInt.cNsMaxInterval = cNsSysHz * 4;
+                State.u.ChgInt.cNsMinInterval = cNsSysHz;
+            }
+            State.u.ChgInt.cNsChangeStep  = (State.u.ChgInt.cNsMaxInterval - State.u.ChgInt.cNsMinInterval) / 10;
+            State.u.ChgInt.cNsCurInterval = State.u.ChgInt.fDirection
+                                          ? State.u.ChgInt.cNsMaxInterval : State.u.ChgInt.cNsMinInterval;
+            State.u.ChgInt.cStepsBetween  = u64Arg & 4 ? 1 : 3;
+            RTR0TESTR0_CHECK_MSG_BREAK(State.u.ChgInt.cNsMinInterval > 1000, ("%u\n", State.u.ChgInt.cNsMinInterval));
+            RTR0TESTR0_CHECK_MSG_BREAK(State.u.ChgInt.cNsMaxInterval > State.u.ChgInt.cNsMinInterval, ("max=%u min=%u\n", State.u.ChgInt.cNsMaxInterval, State.u.ChgInt.cNsMinInterval));
+            ASMAtomicWriteU32(&State.cShots, State.cShots);
+
+            /* create the timer and check if RTTimerChangeInterval is supported. */
+            PRTTIMER pTimer;
+            uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+            RTR0TESTR0_CHECK_RC_BREAK(RTTimerCreateEx(&pTimer, cNsSysHz, fFlags, tstRTR0TimerCallbackChangeInterval, &State),
+                                      VINF_SUCCESS);
+            int rc = RTTimerChangeInterval(pTimer, State.u.ChgInt.cNsMinInterval);
+            if (rc == VERR_NOT_SUPPORTED)
+            {
+                RTR0TestR0Info("RTTimerChangeInterval not supported, skipped");
+                RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+                RTR0TESTR0_SKIP();
+                break;
+            }
+
+            /* do the test. */
+            RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, u64Arg & 2 ? State.u.ChgInt.cNsCurInterval : 0), VINF_SUCCESS);
+            for (uint32_t k = 0;
+                    k < 1000
+                 && ASMAtomicReadU32(&State.cShots) <= State.iActionShot
+                 && State.rc == VERR_IPE_UNINITIALIZED_STATUS;
+                 k++)
+                RTThreadSleep(10);
+
+            rc = RTTimerStop(pTimer);
+            RTR0TESTR0_CHECK_MSG_BREAK(rc == VERR_TIMER_SUSPENDED || rc == VINF_SUCCESS, ("rc = %Rrc (RTTimerStop)\n", rc));
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            break;
+        }
+
+        case TSTRTR0TIMER_PERIODIC_SPECIFIC:
+        case TSTRTR0TIMER_PERIODIC_SPECIFIC_HIRES:
+        {
+            PRTTIMER pTimer = NULL;
+            RTCPUSET OnlineSet;
+            RTMpGetOnlineSet(&OnlineSet);
+            for (uint32_t iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
+                if (RTCpuSetIsMemberByIndex(&OnlineSet, iCpu))
+                {
+                    RT_ZERO(State);
+                    State.iActionShot       = 0;
+                    State.rc                = VINF_SUCCESS;
+                    State.fPeriodic         = true;
+                    State.u.Specific.idCpu  = RTMpCpuIdFromSetIndex(iCpu);
+                    ASMAtomicWriteU32(&State.cShots, State.cShots);
+
+                    uint32_t fFlags = TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0;
+                    fFlags |= RTTIMER_FLAGS_CPU(iCpu);
+                    int rc = RTTimerCreateEx(&pTimer, cNsSysHz, fFlags, tstRTR0TimerCallbackSpecific, &State);
+                    if (rc == VERR_NOT_SUPPORTED)
+                    {
+                        RTR0TestR0Info("specific timer are not supported, skipping\n");
+                        RTR0TESTR0_SKIP();
+                        break;
+                    }
+                    RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+                    for (uint32_t i = 0; i < 3 && !RTR0TestR0HaveErrors(); i++)
+                    {
+                        ASMAtomicWriteU32(&State.cShots, 0);
+                        RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, (i & 2 ? cNsSysHz : cNsSysHz / 2) * (i & 1)), VINF_SUCCESS);
+                        uint64_t cNsElapsed = RTTimeSystemNanoTS();
+                        for (uint32_t j = 0; j < 1000 && ASMAtomicUoReadU32(&State.cShots) < 8; j++)
+                            RTThreadSleep(5);
+                        cNsElapsed = RTTimeSystemNanoTS() - cNsElapsed;
+                        RTR0TESTR0_CHECK_RC_BREAK(RTTimerStop(pTimer), VINF_SUCCESS);
+                        RTR0TESTR0_CHECK_MSG_BREAK(ASMAtomicReadU32(&State.cShots) > 5,
+                                                   ("cShots=%u iCpu=%u i=%u iCurCpu=%u cNsElapsed=%'llu\n",
+                                                    State.cShots, iCpu, i, RTMpCpuIdToSetIndex(RTMpCpuId()), cNsElapsed));
+                        RTThreadSleep(1); /** @todo RTTimerStop doesn't currently make sure the timer callback not is running
+                                           *        before returning on windows, linux (low res) and possible other plaforms. */
+                        RTR0TESTR0_CHECK_MSG_BREAK(State.rc == VINF_SUCCESS, ("rc=%Rrc\n", State.rc));
+                        RTR0TESTR0_CHECK_MSG_BREAK(!State.u.Specific.fFailed, ("iCpu=%u i=%u\n", iCpu, i));
+                    }
+
+                    RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+                    pTimer = NULL;
+                    if (RTR0TestR0HaveErrors())
+                        break;
+
+                    RTMpGetOnlineSet(&OnlineSet);
+                }
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            break;
+        }
+
+        case TSTRTR0TIMER_PERIODIC_OMNI:
+        case TSTRTR0TIMER_PERIODIC_OMNI_HIRES:
+        {
+            /* Create a periodic timer running at max host frequency, but no more than 1000 Hz. */
+            uint32_t        cNsInterval = cNsSysHz;
+            while (cNsInterval < UINT32_C(1000000))
+                cNsInterval *= 2;
+            PTSTRTR0TIMEROMNI1 paStates = (PTSTRTR0TIMEROMNI1)RTMemAllocZ(sizeof(paStates[0]) * RTCPUSET_MAX_CPUS);
+            RTR0TESTR0_CHECK_MSG_BREAK(paStates, ("%d\n", RTCPUSET_MAX_CPUS));
+
+            PRTTIMER        pTimer;
+            uint32_t        fFlags = (TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0)
+                                   | RTTIMER_FLAGS_CPU_ALL;
+            int             rc = RTTimerCreateEx(&pTimer, cNsInterval, fFlags, tstRTR0TimerCallbackOmni, paStates);
+            if (rc == VERR_NOT_SUPPORTED)
+            {
+                RTR0TESTR0_SKIP_BREAK();
+            }
+            RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+            for (uint32_t iTest = 0; iTest < 3 && !RTR0TestR0HaveErrors(); iTest++)
+            {
+                /* reset the state */
+                for (uint32_t iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
+                {
+                    paStates[iCpu].u64Start = 0;
+                    paStates[iCpu].u64Last  = 0;
+                    ASMAtomicWriteU32(&paStates[iCpu].cTicks, 0);
+                }
+
+                /* run it for 5 seconds. */
+                RTCPUSET OnlineSet;
+                uint64_t uStartNsTS = RTTimeSystemNanoTS();
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, 0), VINF_SUCCESS);
+                RTMpGetOnlineSet(&OnlineSet);
+
+                for (uint32_t i = 0; i < 5000 && RTTimeSystemNanoTS() - uStartNsTS <= UINT64_C(5000000000); i++)
+                    RTThreadSleep(2);
+
+                RTR0TESTR0_CHECK_RC_BREAK(RTTimerStop(pTimer), VINF_SUCCESS);
+                uint64_t    cNsElapsedX = RTTimeNanoTS() - uStartNsTS;
+
+                /* Do a min/max on the start and stop times and calculate the test period. */
+                uint64_t    u64MinStart = UINT64_MAX;
+                uint64_t    u64MaxStop  = 0;
+                for (uint32_t iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
+                {
+                    if (paStates[iCpu].u64Start)
+                    {
+                        if (paStates[iCpu].u64Start < u64MinStart)
+                            u64MinStart = paStates[iCpu].u64Start;
+                        if (paStates[iCpu].u64Last  > u64MaxStop)
+                            u64MaxStop  = paStates[iCpu].u64Last;
+                    }
+                }
+                RTR0TESTR0_CHECK_MSG(u64MinStart < u64MaxStop, ("%llu, %llu", u64MinStart, u64MaxStop));
+                uint64_t cNsElapsed = u64MaxStop - u64MinStart;
+                RTR0TESTR0_CHECK_MSG(cNsElapsed <= cNsElapsedX + 100000, ("%llu, %llu", cNsElapsed, cNsElapsedX)); /* the fudge factor is time drift */
+                uint32_t cAvgTicks  = cNsElapsed / cNsInterval + 1;
+
+                /* Check tick counts. ASSUMES no cpu on- or offlining.
+                   This only catches really bad stuff. */
+                uint32_t cMargin = TSTRTR0TIMER_IS_HIRES(uOperation) ? 10 : 5; /* Allow a wider deviation for the non hires timers. */
+                uint32_t cMinTicks = cAvgTicks - cAvgTicks / cMargin;
+                uint32_t cMaxTicks = cAvgTicks + cAvgTicks / cMargin + 1;
+                for (uint32_t iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
+                    if (paStates[iCpu].cTicks)
+                    {
+                        RTR0TESTR0_CHECK_MSG(RTCpuSetIsMemberByIndex(&OnlineSet, iCpu), ("%d\n", iCpu));
+                        RTR0TESTR0_CHECK_MSG(paStates[iCpu].cTicks <= cMaxTicks && paStates[iCpu].cTicks >= cMinTicks,
+                                             ("min=%u, ticks=%u, avg=%u max=%u, iCpu=%u, iCpuCurr=%u, interval=%'u, elapsed=%'llu/%'llu\n",
+                                              cMinTicks, paStates[iCpu].cTicks, cAvgTicks, cMaxTicks, iCpu,
+                                              RTMpCpuIdToSetIndex(RTMpCpuId()),
+                                              cNsInterval, cNsElapsed, cNsElapsedX));
+                    }
+                    else
+                        RTR0TESTR0_CHECK_MSG(!RTCpuSetIsMemberByIndex(&OnlineSet, iCpu), ("%d\n", iCpu));
+            }
+
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+            RTMemFree(paStates);
+            break;
+        }
+
+
+        case TSTRTR0TIMER_LATENCY_OMNI:
+        case TSTRTR0TIMER_LATENCY_OMNI_HIRES:
+        {
+            /*
+             * Create a periodic timer running at max host frequency, but no more than 1000 Hz.
+             * Unless it's a high resolution timer, which we try at double the rate.
+             * Windows seems to limit the highres stuff to around 500-600 us interval.
+             */
+            PRTTIMER        pTimer;
+            uint32_t        fFlags = (TSTRTR0TIMER_IS_HIRES(uOperation) ? RTTIMER_FLAGS_HIGH_RES : 0)
+                                   | RTTIMER_FLAGS_CPU_ALL;
+            uint32_t const  cNsMinInterval = TSTRTR0TIMER_IS_HIRES(uOperation) ? cNsMaxHighResHz : RT_NS_1MS;
+            uint32_t        cNsInterval    = TSTRTR0TIMER_IS_HIRES(uOperation) ? cNsSysHz / 2 : cNsSysHz;
+            while (cNsInterval < cNsMinInterval)
+                cNsInterval *= 2;
+            int rc = RTTimerCreateEx(&pTimer, cNsInterval, fFlags, tstRTR0TimerCallbackLatencyOmni, NULL);
+            if (rc == VERR_NOT_SUPPORTED)
+            {
+                RTR0TESTR0_SKIP_BREAK();
+            }
+            RTR0TESTR0_CHECK_RC_BREAK(rc, VINF_SUCCESS);
+
+            /*
+             * Reset the state and run the test for 4 seconds.
+             */
+            RT_ZERO(g_aOmniLatency);
+
+            RTCPUSET OnlineSet;
+            uint64_t uStartNsTS = RTTimeSystemNanoTS();
+            RTR0TESTR0_CHECK_RC_BREAK(RTTimerStart(pTimer, 0), VINF_SUCCESS);
+            RTMpGetOnlineSet(&OnlineSet);
+
+            for (uint32_t i = 0; i < 5000 && RTTimeSystemNanoTS() - uStartNsTS <= UINT64_C(4000000000); i++)
+                RTThreadSleep(2);
+
+            RTR0TESTR0_CHECK_RC_BREAK(RTTimerStop(pTimer), VINF_SUCCESS);
+
+            /*
+             * Process the result.
+             */
+            int32_t     cNsLow  = cNsInterval / 4 * 3; /* 75% */
+            int32_t     cNsHigh = cNsInterval / 4 * 5; /* 125% */
+            uint32_t    cTotal  = 0;
+            uint32_t    cLow    = 0;
+            uint32_t    cHigh   = 0;
+            for (uint32_t iCpu = 0; iCpu < RT_ELEMENTS(g_aOmniLatency); iCpu++)
+            {
+                uint32_t cSamples = g_aOmniLatency[iCpu].cSamples;
+                if (cSamples > 1)
+                {
+                    cTotal += cSamples - 1;
+                    for (uint32_t iSample = 1; iSample < cSamples; iSample++)
+                    {
+                        int64_t cNsDelta = g_aOmniLatency[iCpu].aSamples[iSample].uNanoTs
+                                         - g_aOmniLatency[iCpu].aSamples[iSample - 1].uNanoTs;
+                        if (cNsDelta < cNsLow)
+                            cLow++;
+                        else if (cNsDelta > cNsHigh)
+                            cHigh++;
+                    }
+                }
+            }
+            RTR0TestR0Info("125%%: %u; 75%%: %u; total: %u", cHigh, cLow, cTotal);
+            RTR0TESTR0_CHECK_RC(RTTimerDestroy(pTimer), VINF_SUCCESS);
+#if 1
+            RTR0TestR0Info("cNsSysHz=%u cNsInterval=%RU32 cNsLow=%d cNsHigh=%d", cNsSysHz, cNsInterval, cNsLow, cNsHigh);
+            if (TSTRTR0TIMER_IS_HIRES(uOperation))
+                RTR0TestR0Info("RTTimerCanDoHighResolution -> %d", RTTimerCanDoHighResolution());
+            for (uint32_t iSample = 1; iSample < 6; iSample++)
+                RTR0TestR0Info("%RU64/%#RU64",
+                                g_aOmniLatency[0].aSamples[iSample].uNanoTs - g_aOmniLatency[0].aSamples[iSample - 1].uNanoTs,
+                                g_aOmniLatency[0].aSamples[iSample].uTsc - g_aOmniLatency[0].aSamples[iSample - 1].uTsc);
+#endif
+            break;
+        }
+
+    }
+
+    RTR0TESTR0_SRV_REQ_EPILOG(pReqHdr);
+    /* The error indicator is the '!' in the message buffer. */
+    return VINF_SUCCESS;
+}
+