TMAllCpu.cpp@ 62596

Last change on this file since 62596 was 62478, checked in by vboxsync, 8 years ago
(C) 2016
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1	/* $Id: TMAllCpu.cpp 62478 2016-07-22 18:29:06Z vboxsync $ */
2	/** @file
3	* TM - Timeout Manager, CPU Time, All Contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*********************************************************************************************************************************
20	* Header Files *
21	*********************************************************************************************************************************/
22	#define LOG_GROUP LOG_GROUP_TM
23	#include <VBox/vmm/tm.h>
24	#include <iprt/asm-amd64-x86.h> /* for SUPGetCpuHzFromGIP */
25	#include "TMInternal.h"
26	#include <VBox/vmm/vm.h>
27	#include <VBox/vmm/gim.h>
28	#include <VBox/vmm/dbgf.h>
29	#include <VBox/sup.h>
30
31	#include <VBox/param.h>
32	#include <VBox/err.h>
33	#include <iprt/asm-math.h>
34	#include <iprt/assert.h>
35	#include <VBox/log.h>
36
37
38	/**
39	* Gets the raw cpu tick from current virtual time.
40	*
41	* @param pVM The cross context VM structure.
42	* @param fCheckTimers Whether to check timers.
43	*/
44	DECLINLINE(uint64_t) tmCpuTickGetRawVirtual(PVM pVM, bool fCheckTimers)
45	{
46	uint64_t u64;
47	if (fCheckTimers)
48	u64 = TMVirtualSyncGet(pVM);
49	else
50	u64 = TMVirtualSyncGetNoCheck(pVM);
51	if (u64 != TMCLOCK_FREQ_VIRTUAL) /* what's the use of this test, document! */
52	u64 = ASMMultU64ByU32DivByU32(u64, pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL);
53	return u64;
54	}
55
56
57	#ifdef IN_RING3
58	/**
59	* Used by tmR3CpuTickParavirtEnable and tmR3CpuTickParavirtDisable.
60	*
61	* @param pVM The cross context VM structure.
62	*/
63	uint64_t tmR3CpuTickGetRawVirtualNoCheck(PVM pVM)
64	{
65	return tmCpuTickGetRawVirtual(pVM, false /fCheckTimers/);
66	}
67	#endif
68
69
70	/**
71	* Resumes the CPU timestamp counter ticking.
72	*
73	* @returns VBox status code.
74	* @param pVM The cross context VM structure.
75	* @param pVCpu The cross context virtual CPU structure.
76	* @internal
77	*/
78	int tmCpuTickResume(PVM pVM, PVMCPU pVCpu)
79	{
80	if (!pVCpu->tm.s.fTSCTicking)
81	{
82	pVCpu->tm.s.fTSCTicking = true;
83
84	/** @todo Test that pausing and resuming doesn't cause lag! (I.e. that we're
85	* unpaused before the virtual time and stopped after it. */
86	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
87	pVCpu->tm.s.offTSCRawSrc = SUPReadTsc() - pVCpu->tm.s.u64TSC;
88	else
89	pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
90	- pVCpu->tm.s.u64TSC;
91	return VINF_SUCCESS;
92	}
93	AssertFailed();
94	return VERR_TM_TSC_ALREADY_TICKING;
95	}
96
97
98	/**
99	* Resumes the CPU timestamp counter ticking.
100	*
101	* @returns VINF_SUCCESS or VERR_TM_VIRTUAL_TICKING_IPE (asserted).
102	* @param pVM The cross context VM structure.
103	* @param pVCpu The cross context virtual CPU structure.
104	*/
105	int tmCpuTickResumeLocked(PVM pVM, PVMCPU pVCpu)
106	{
107	if (!pVCpu->tm.s.fTSCTicking)
108	{
109	/* TSC must be ticking before calling tmCpuTickGetRawVirtual()! */
110	pVCpu->tm.s.fTSCTicking = true;
111	uint32_t c = ASMAtomicIncU32(&pVM->tm.s.cTSCsTicking);
112	AssertMsgReturn(c <= pVM->cCpus, ("%u vs %u\n", c, pVM->cCpus), VERR_TM_VIRTUAL_TICKING_IPE);
113	if (c == 1)
114	{
115	/* The first VCPU to resume. */
116	uint64_t offTSCRawSrcOld = pVCpu->tm.s.offTSCRawSrc;
117
118	STAM_COUNTER_INC(&pVM->tm.s.StatTSCResume);
119
120	/* When resuming, use the TSC value of the last stopped VCPU to avoid the TSC going back. */
121	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
122	pVCpu->tm.s.offTSCRawSrc = SUPReadTsc() - pVM->tm.s.u64LastPausedTSC;
123	else
124	pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
125	- pVM->tm.s.u64LastPausedTSC;
126
127	/* Calculate the offset for other VCPUs to use. */
128	pVM->tm.s.offTSCPause = pVCpu->tm.s.offTSCRawSrc - offTSCRawSrcOld;
129	}
130	else
131	{
132	/* All other VCPUs (if any). */
133	pVCpu->tm.s.offTSCRawSrc += pVM->tm.s.offTSCPause;
134	}
135	}
136	return VINF_SUCCESS;
137	}
138
139
140	/**
141	* Pauses the CPU timestamp counter ticking.
142	*
143	* @returns VBox status code.
144	* @param pVCpu The cross context virtual CPU structure.
145	* @internal
146	*/
147	int tmCpuTickPause(PVMCPU pVCpu)
148	{
149	if (pVCpu->tm.s.fTSCTicking)
150	{
151	pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
152	pVCpu->tm.s.fTSCTicking = false;
153	return VINF_SUCCESS;
154	}
155	AssertFailed();
156	return VERR_TM_TSC_ALREADY_PAUSED;
157	}
158
159
160	/**
161	* Pauses the CPU timestamp counter ticking.
162	*
163	* @returns VBox status code.
164	* @param pVM The cross context VM structure.
165	* @param pVCpu The cross context virtual CPU structure.
166	* @internal
167	*/
168	int tmCpuTickPauseLocked(PVM pVM, PVMCPU pVCpu)
169	{
170	if (pVCpu->tm.s.fTSCTicking)
171	{
172	pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
173	pVCpu->tm.s.fTSCTicking = false;
174
175	uint32_t c = ASMAtomicDecU32(&pVM->tm.s.cTSCsTicking);
176	AssertMsgReturn(c < pVM->cCpus, ("%u vs %u\n", c, pVM->cCpus), VERR_TM_VIRTUAL_TICKING_IPE);
177	if (c == 0)
178	{
179	/* When the last TSC stops, remember the value. */
180	STAM_COUNTER_INC(&pVM->tm.s.StatTSCPause);
181	pVM->tm.s.u64LastPausedTSC = pVCpu->tm.s.u64TSC;
182	}
183	return VINF_SUCCESS;
184	}
185	AssertFailed();
186	return VERR_TM_TSC_ALREADY_PAUSED;
187	}
188
189
190	/**
191	* Record why we refused to use offsetted TSC.
192	*
193	* Used by TMCpuTickCanUseRealTSC() and TMCpuTickGetDeadlineAndTscOffset().
194	*
195	* @param pVM The cross context VM structure.
196	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
197	*/
198	DECLINLINE(void) tmCpuTickRecordOffsettedTscRefusal(PVM pVM, PVMCPU pVCpu)
199	{
200	/* Sample the reason for refusing. */
201	if (pVM->tm.s.enmTSCMode != TMTSCMODE_DYNAMIC)
202	STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotFixed);
203	else if (!pVCpu->tm.s.fTSCTicking)
204	STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotTicking);
205	else if (pVM->tm.s.enmTSCMode != TMTSCMODE_REAL_TSC_OFFSET)
206	{
207	if (pVM->tm.s.fVirtualSyncCatchUp)
208	{
209	if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 10)
210	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE010);
211	else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 25)
212	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE025);
213	else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 100)
214	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE100);
215	else
216	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupOther);
217	}
218	else if (!pVM->tm.s.fVirtualSyncTicking)
219	STAM_COUNTER_INC(&pVM->tm.s.StatTSCSyncNotTicking);
220	else if (pVM->tm.s.fVirtualWarpDrive)
221	STAM_COUNTER_INC(&pVM->tm.s.StatTSCWarp);
222	}
223	}
224
225
226	/**
227	* Checks if AMD-V / VT-x can use an offsetted hardware TSC or not.
228	*
229	* @returns true/false accordingly.
230	* @param pVM The cross context VM structure.
231	* @param pVCpu The cross context virtual CPU structure.
232	* @param poffRealTsc The offset against the TSC of the current host CPU,
233	* if pfOffsettedTsc is set to true.
234	* @param pfParavirtTsc Where to return whether paravirt TSC is enabled.
235	*
236	* @thread EMT(pVCpu).
237	* @see TMCpuTickGetDeadlineAndTscOffset().
238	*/
239	VMM_INT_DECL(bool) TMCpuTickCanUseRealTSC(PVM pVM, PVMCPU pVCpu, uint64_t poffRealTsc, bool pfParavirtTsc)
240	{
241	Assert(pVCpu->tm.s.fTSCTicking \|\| DBGFIsStepping(pVCpu));
242
243	*pfParavirtTsc = pVM->tm.s.fParavirtTscEnabled;
244
245	/*
246	* In real TSC mode it's easy, we just need the delta & offTscRawSrc and
247	* the CPU will add them to RDTSC and RDTSCP at runtime.
248	*
249	* In tmCpuTickGetInternal we do:
250	* SUPReadTsc() - pVCpu->tm.s.offTSCRawSrc;
251	* Where SUPReadTsc() does:
252	* ASMReadTSC() - pGipCpu->i64TscDelta;
253	* Which means tmCpuTickGetInternal actually does:
254	* ASMReadTSC() - pGipCpu->i64TscDelta - pVCpu->tm.s.offTSCRawSrc;
255	* So, the offset to be ADDED to RDTSC[P] is:
256	* offRealTsc = -(pGipCpu->i64TscDelta + pVCpu->tm.s.offTSCRawSrc)
257	*/
258	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
259	{
260	/** @todo We should negate both deltas! It's soo weird that we do the
261	* exact opposite of what the hardware implements. */
262	#ifdef IN_RING3
263	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDelta();
264	#else
265	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet);
266	#endif
267	return true;
268	}
269
270	/*
271	* We require:
272	* 1. A fixed TSC, this is checked at init time.
273	* 2. That the TSC is ticking (we shouldn't be here if it isn't)
274	* 3. Either that we're using the real TSC as time source or
275	* a) we don't have any lag to catch up, and
276	* b) the virtual sync clock hasn't been halted by an expired timer, and
277	* c) we're not using warp drive (accelerated virtual guest time).
278	*/
279	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_DYNAMIC
280	&& !pVM->tm.s.fVirtualSyncCatchUp
281	&& RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
282	&& !pVM->tm.s.fVirtualWarpDrive)
283	{
284	/* The source is the timer synchronous virtual clock. */
285	uint64_t u64Now = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
286	- pVCpu->tm.s.offTSCRawSrc;
287	/** @todo When we start collecting statistics on how much time we spend executing
288	* guest code before exiting, we should check this against the next virtual sync
289	* timer timeout. If it's lower than the avg. length, we should trap rdtsc to increase
290	* the chance that we'll get interrupted right after the timer expired. */
291	if (u64Now >= pVCpu->tm.s.u64TSCLastSeen)
292	{
293	*poffRealTsc = u64Now - ASMReadTSC();
294	return true; /** @todo count this? */
295	}
296	}
297
298	#ifdef VBOX_WITH_STATISTICS
299	tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
300	#endif
301	return false;
302	}
303
304
305	/**
306	* Calculates the number of host CPU ticks till the next virtual sync deadline.
307	*
308	* @note To save work, this function will not bother calculating the accurate
309	* tick count for deadlines that are more than a second ahead.
310	*
311	* @returns The number of host cpu ticks to the next deadline. Max one second.
312	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
313	* @param cNsToDeadline The number of nano seconds to the next virtual
314	* sync deadline.
315	*/
316	DECLINLINE(uint64_t) tmCpuCalcTicksToDeadline(PVMCPU pVCpu, uint64_t cNsToDeadline)
317	{
318	AssertCompile(TMCLOCK_FREQ_VIRTUAL <= _4G);
319	#ifdef IN_RING3
320	uint64_t uCpuHz = SUPGetCpuHzFromGip(g_pSUPGlobalInfoPage);
321	#else
322	uint64_t uCpuHz = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, pVCpu->iHostCpuSet);
323	#endif
324	if (RT_UNLIKELY(cNsToDeadline >= TMCLOCK_FREQ_VIRTUAL))
325	return uCpuHz;
326	uint64_t cTicks = ASMMultU64ByU32DivByU32(uCpuHz, cNsToDeadline, TMCLOCK_FREQ_VIRTUAL);
327	if (cTicks > 4000)
328	cTicks -= 4000; /* fudge to account for overhead */
329	else
330	cTicks >>= 1;
331	return cTicks;
332	}
333
334
335	/**
336	* Gets the next deadline in host CPU clock ticks and the TSC offset if we can
337	* use the raw TSC.
338	*
339	* @returns The number of host CPU clock ticks to the next timer deadline.
340	* @param pVM The cross context VM structure.
341	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
342	* @param poffRealTsc The offset against the TSC of the current host CPU,
343	* if pfOffsettedTsc is set to true.
344	* @param pfOffsettedTsc Where to return whether TSC offsetting can be used.
345	* @param pfParavirtTsc Where to return whether paravirt TSC is enabled.
346	*
347	* @thread EMT(pVCpu).
348	* @see TMCpuTickCanUseRealTSC().
349	*/
350	VMM_INT_DECL(uint64_t) TMCpuTickGetDeadlineAndTscOffset(PVM pVM, PVMCPU pVCpu, uint64_t *poffRealTsc,
351	bool pfOffsettedTsc, bool pfParavirtTsc)
352	{
353	Assert(pVCpu->tm.s.fTSCTicking \|\| DBGFIsStepping(pVCpu));
354
355	*pfParavirtTsc = pVM->tm.s.fParavirtTscEnabled;
356
357	/*
358	* Same logic as in TMCpuTickCanUseRealTSC.
359	*/
360	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
361	{
362	/** @todo We should negate both deltas! It's soo weird that we do the
363	* exact opposite of what the hardware implements. */
364	#ifdef IN_RING3
365	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDelta();
366	#else
367	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet);
368	#endif
369	*pfOffsettedTsc = true;
370	return tmCpuCalcTicksToDeadline(pVCpu, TMVirtualSyncGetNsToDeadline(pVM));
371	}
372
373	/*
374	* Same logic as in TMCpuTickCanUseRealTSC.
375	*/
376	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_DYNAMIC
377	&& !pVM->tm.s.fVirtualSyncCatchUp
378	&& RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
379	&& !pVM->tm.s.fVirtualWarpDrive)
380	{
381	/* The source is the timer synchronous virtual clock. */
382	uint64_t cNsToDeadline;
383	uint64_t u64NowVirtSync = TMVirtualSyncGetWithDeadlineNoCheck(pVM, &cNsToDeadline);
384	uint64_t u64Now = u64NowVirtSync != TMCLOCK_FREQ_VIRTUAL /* what's the use of this? */
385	? ASMMultU64ByU32DivByU32(u64NowVirtSync, pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL)
386	: u64NowVirtSync;
387	u64Now -= pVCpu->tm.s.offTSCRawSrc;
388	*poffRealTsc = u64Now - ASMReadTSC();
389	*pfOffsettedTsc = u64Now >= pVCpu->tm.s.u64TSCLastSeen;
390	return tmCpuCalcTicksToDeadline(pVCpu, cNsToDeadline);
391	}
392
393	#ifdef VBOX_WITH_STATISTICS
394	tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
395	#endif
396	*pfOffsettedTsc = false;
397	*poffRealTsc = 0;
398	return tmCpuCalcTicksToDeadline(pVCpu, TMVirtualSyncGetNsToDeadline(pVM));
399	}
400
401
402	/**
403	* Read the current CPU timestamp counter.
404	*
405	* @returns Gets the CPU tsc.
406	* @param pVCpu The cross context virtual CPU structure.
407	* @param fCheckTimers Whether to check timers.
408	*/
409	DECLINLINE(uint64_t) tmCpuTickGetInternal(PVMCPU pVCpu, bool fCheckTimers)
410	{
411	uint64_t u64;
412
413	if (RT_LIKELY(pVCpu->tm.s.fTSCTicking))
414	{
415	PVM pVM = pVCpu->CTX_SUFF(pVM);
416	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
417	u64 = SUPReadTsc();
418	else
419	u64 = tmCpuTickGetRawVirtual(pVM, fCheckTimers);
420	u64 -= pVCpu->tm.s.offTSCRawSrc;
421
422	/* Always return a value higher than what the guest has already seen. */
423	if (RT_LIKELY(u64 > pVCpu->tm.s.u64TSCLastSeen))
424	pVCpu->tm.s.u64TSCLastSeen = u64;
425	else
426	{
427	STAM_COUNTER_INC(&pVM->tm.s.StatTSCUnderflow);
428	pVCpu->tm.s.u64TSCLastSeen += 64; /** @todo choose a good increment here */
429	u64 = pVCpu->tm.s.u64TSCLastSeen;
430	}
431	}
432	else
433	u64 = pVCpu->tm.s.u64TSC;
434	return u64;
435	}
436
437
438	/**
439	* Read the current CPU timestamp counter.
440	*
441	* @returns Gets the CPU tsc.
442	* @param pVCpu The cross context virtual CPU structure.
443	*/
444	VMMDECL(uint64_t) TMCpuTickGet(PVMCPU pVCpu)
445	{
446	return tmCpuTickGetInternal(pVCpu, true /* fCheckTimers */);
447	}
448
449
450	/**
451	* Read the current CPU timestamp counter, don't check for expired timers.
452	*
453	* @returns Gets the CPU tsc.
454	* @param pVCpu The cross context virtual CPU structure.
455	*/
456	VMM_INT_DECL(uint64_t) TMCpuTickGetNoCheck(PVMCPU pVCpu)
457	{
458	return tmCpuTickGetInternal(pVCpu, false /* fCheckTimers */);
459	}
460
461
462	/**
463	* Sets the current CPU timestamp counter.
464	*
465	* @returns VBox status code.
466	* @param pVM The cross context VM structure.
467	* @param pVCpu The cross context virtual CPU structure.
468	* @param u64Tick The new timestamp value.
469	*
470	* @thread EMT which TSC is to be set.
471	*/
472	VMM_INT_DECL(int) TMCpuTickSet(PVM pVM, PVMCPU pVCpu, uint64_t u64Tick)
473	{
474	VMCPU_ASSERT_EMT(pVCpu);
475	STAM_COUNTER_INC(&pVM->tm.s.StatTSCSet);
476
477	/*
478	* This is easier to do when the TSC is paused since resume will
479	* do all the calculations for us. Actually, we don't need to
480	* call tmCpuTickPause here since we overwrite u64TSC anyway.
481	*/
482	bool fTSCTicking = pVCpu->tm.s.fTSCTicking;
483	pVCpu->tm.s.fTSCTicking = false;
484	pVCpu->tm.s.u64TSC = u64Tick;
485	pVCpu->tm.s.u64TSCLastSeen = u64Tick;
486	if (fTSCTicking)
487	tmCpuTickResume(pVM, pVCpu);
488	/** @todo Try help synchronizing it better among the virtual CPUs? */
489
490	return VINF_SUCCESS;
491	}
492
493	/**
494	* Sets the last seen CPU timestamp counter.
495	*
496	* @returns VBox status code.
497	* @param pVCpu The cross context virtual CPU structure.
498	* @param u64LastSeenTick The last seen timestamp value.
499	*
500	* @thread EMT which TSC is to be set.
501	*/
502	VMM_INT_DECL(int) TMCpuTickSetLastSeen(PVMCPU pVCpu, uint64_t u64LastSeenTick)
503	{
504	VMCPU_ASSERT_EMT(pVCpu);
505
506	LogFlow(("TMCpuTickSetLastSeen %RX64\n", u64LastSeenTick));
507	if (pVCpu->tm.s.u64TSCLastSeen < u64LastSeenTick)
508	pVCpu->tm.s.u64TSCLastSeen = u64LastSeenTick;
509	return VINF_SUCCESS;
510	}
511
512	/**
513	* Gets the last seen CPU timestamp counter of the guest.
514	*
515	* @returns the last seen TSC.
516	* @param pVCpu The cross context virtual CPU structure.
517	*
518	* @thread EMT(pVCpu).
519	*/
520	VMM_INT_DECL(uint64_t) TMCpuTickGetLastSeen(PVMCPU pVCpu)
521	{
522	VMCPU_ASSERT_EMT(pVCpu);
523
524	return pVCpu->tm.s.u64TSCLastSeen;
525	}
526
527
528	/**
529	* Get the timestamp frequency.
530	*
531	* @returns Number of ticks per second.
532	* @param pVM The cross context VM structure.
533	*/
534	VMMDECL(uint64_t) TMCpuTicksPerSecond(PVM pVM)
535	{
536	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET
537	&& g_pSUPGlobalInfoPage->u32Mode != SUPGIPMODE_INVARIANT_TSC)
538	{
539	#ifdef IN_RING3
540	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGip(g_pSUPGlobalInfoPage);
541	#elif defined(IN_RING0)
542	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, RTMpCpuIdToSetIndex(RTMpCpuId()));
543	#else
544	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, VMMGetCpu(pVM)->iHostCpuSet);
545	#endif
546	if (RT_LIKELY(cTSCTicksPerSecond != ~(uint64_t)0))
547	return cTSCTicksPerSecond;
548	}
549	return pVM->tm.s.cTSCTicksPerSecond;
550	}
551
552
553	/**
554	* Whether the TSC is ticking for the VCPU.
555	*
556	* @returns true if ticking, false otherwise.
557	* @param pVCpu The cross context virtual CPU structure.
558	*/
559	VMM_INT_DECL(bool) TMCpuTickIsTicking(PVMCPU pVCpu)
560	{
561	return pVCpu->tm.s.fTSCTicking;
562	}
563

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source: vbox/trunk/src/VBox/VMM/VMMAll/TMAllCpu.cpp@ 62596

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