TMAllCpu.cpp@ 74157

Last change on this file since 74157 was 72546, checked in by vboxsync, 7 years ago
NEM/win,TM: Setting TSC on TM start/restore/resume/etc as best we can. bugref:9044
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1	/* $Id: TMAllCpu.cpp 72546 2018-06-13 15:45:39Z vboxsync $ */
2	/** @file
3	* TM - Timeout Manager, CPU Time, All Contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2017 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 <VBox/vmm/gim.h>
25	#include <VBox/vmm/dbgf.h>
26	#include <VBox/vmm/nem.h>
27	#include <iprt/asm-amd64-x86.h> /* for SUPGetCpuHzFromGIP */
28	#include "TMInternal.h"
29	#include <VBox/vmm/vm.h>
30	#include <VBox/sup.h>
31
32	#include <VBox/param.h>
33	#include <VBox/err.h>
34	#include <iprt/asm-math.h>
35	#include <iprt/assert.h>
36	#include <VBox/log.h>
37
38
39	/**
40	* Gets the raw cpu tick from current virtual time.
41	*
42	* @param pVM The cross context VM structure.
43	* @param fCheckTimers Whether to check timers.
44	*/
45	DECLINLINE(uint64_t) tmCpuTickGetRawVirtual(PVM pVM, bool fCheckTimers)
46	{
47	uint64_t u64;
48	if (fCheckTimers)
49	u64 = TMVirtualSyncGet(pVM);
50	else
51	u64 = TMVirtualSyncGetNoCheck(pVM);
52	return ASMMultU64ByU32DivByU32(u64, pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL);
53	}
54
55
56	#ifdef IN_RING3
57	/**
58	* Used by tmR3CpuTickParavirtEnable and tmR3CpuTickParavirtDisable.
59	*
60	* @param pVM The cross context VM structure.
61	*/
62	uint64_t tmR3CpuTickGetRawVirtualNoCheck(PVM pVM)
63	{
64	return tmCpuTickGetRawVirtual(pVM, false /fCheckTimers/);
65	}
66	#endif
67
68
69	/**
70	* Resumes the CPU timestamp counter ticking.
71	*
72	* @returns VBox status code.
73	* @param pVM The cross context VM structure.
74	* @param pVCpu The cross context virtual CPU structure.
75	* @internal
76	*/
77	int tmCpuTickResume(PVM pVM, PVMCPU pVCpu)
78	{
79	if (!pVCpu->tm.s.fTSCTicking)
80	{
81	pVCpu->tm.s.fTSCTicking = true;
82
83	/** @todo Test that pausing and resuming doesn't cause lag! (I.e. that we're
84	* unpaused before the virtual time and stopped after it. */
85	switch (pVM->tm.s.enmTSCMode)
86	{
87	case TMTSCMODE_REAL_TSC_OFFSET:
88	pVCpu->tm.s.offTSCRawSrc = SUPReadTsc() - pVCpu->tm.s.u64TSC;
89	break;
90	case TMTSCMODE_VIRT_TSC_EMULATED:
91	case TMTSCMODE_DYNAMIC:
92	pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
93	- pVCpu->tm.s.u64TSC;
94	break;
95	case TMTSCMODE_NATIVE_API:
96	pVCpu->tm.s.offTSCRawSrc = 0; /** @todo ?? */
97	/* Looks like this is only used by weird modes and MSR TSC writes. We cannot support either on NEM/win. */
98	break;
99	default:
100	AssertFailedReturn(VERR_IPE_NOT_REACHED_DEFAULT_CASE);
101	}
102	return VINF_SUCCESS;
103	}
104	AssertFailed();
105	return VERR_TM_TSC_ALREADY_TICKING;
106	}
107
108
109	/**
110	* Resumes the CPU timestamp counter ticking.
111	*
112	* @returns VINF_SUCCESS or VERR_TM_VIRTUAL_TICKING_IPE (asserted).
113	* @param pVM The cross context VM structure.
114	* @param pVCpu The cross context virtual CPU structure.
115	*/
116	int tmCpuTickResumeLocked(PVM pVM, PVMCPU pVCpu)
117	{
118	if (!pVCpu->tm.s.fTSCTicking)
119	{
120	/* TSC must be ticking before calling tmCpuTickGetRawVirtual()! */
121	pVCpu->tm.s.fTSCTicking = true;
122	uint32_t c = ASMAtomicIncU32(&pVM->tm.s.cTSCsTicking);
123	AssertMsgReturn(c <= pVM->cCpus, ("%u vs %u\n", c, pVM->cCpus), VERR_TM_VIRTUAL_TICKING_IPE);
124	if (c == 1)
125	{
126	/* The first VCPU to resume. */
127	uint64_t offTSCRawSrcOld = pVCpu->tm.s.offTSCRawSrc;
128
129	STAM_COUNTER_INC(&pVM->tm.s.StatTSCResume);
130
131	/* When resuming, use the TSC value of the last stopped VCPU to avoid the TSC going back. */
132	switch (pVM->tm.s.enmTSCMode)
133	{
134	case TMTSCMODE_REAL_TSC_OFFSET:
135	pVCpu->tm.s.offTSCRawSrc = SUPReadTsc() - pVM->tm.s.u64LastPausedTSC;
136	break;
137	case TMTSCMODE_VIRT_TSC_EMULATED:
138	case TMTSCMODE_DYNAMIC:
139	pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
140	- pVM->tm.s.u64LastPausedTSC;
141	break;
142	case TMTSCMODE_NATIVE_API:
143	{
144	#ifndef IN_RC
145	int rc = NEMHCResumeCpuTickOnAll(pVM, pVCpu, pVM->tm.s.u64LastPausedTSC);
146	AssertRCReturn(rc, rc);
147	pVCpu->tm.s.offTSCRawSrc = offTSCRawSrcOld = 0;
148	#else
149	AssertFailedReturn(VERR_INTERNAL_ERROR_2);
150	#endif
151	break;
152	}
153	default:
154	AssertFailedReturn(VERR_IPE_NOT_REACHED_DEFAULT_CASE);
155	}
156
157	/* Calculate the offset addendum for other VCPUs to use. */
158	pVM->tm.s.offTSCPause = pVCpu->tm.s.offTSCRawSrc - offTSCRawSrcOld;
159	}
160	else
161	{
162	/* All other VCPUs (if any). */
163	pVCpu->tm.s.offTSCRawSrc += pVM->tm.s.offTSCPause;
164	}
165	}
166	return VINF_SUCCESS;
167	}
168
169
170	/**
171	* Pauses the CPU timestamp counter ticking.
172	*
173	* @returns VBox status code.
174	* @param pVCpu The cross context virtual CPU structure.
175	* @internal
176	*/
177	int tmCpuTickPause(PVMCPU pVCpu)
178	{
179	if (pVCpu->tm.s.fTSCTicking)
180	{
181	pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
182	pVCpu->tm.s.fTSCTicking = false;
183	return VINF_SUCCESS;
184	}
185	AssertFailed();
186	return VERR_TM_TSC_ALREADY_PAUSED;
187	}
188
189
190	/**
191	* Pauses the CPU timestamp counter ticking.
192	*
193	* @returns VBox status code.
194	* @param pVM The cross context VM structure.
195	* @param pVCpu The cross context virtual CPU structure.
196	* @internal
197	*/
198	int tmCpuTickPauseLocked(PVM pVM, PVMCPU pVCpu)
199	{
200	if (pVCpu->tm.s.fTSCTicking)
201	{
202	pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
203	pVCpu->tm.s.fTSCTicking = false;
204
205	uint32_t c = ASMAtomicDecU32(&pVM->tm.s.cTSCsTicking);
206	AssertMsgReturn(c < pVM->cCpus, ("%u vs %u\n", c, pVM->cCpus), VERR_TM_VIRTUAL_TICKING_IPE);
207	if (c == 0)
208	{
209	/* When the last TSC stops, remember the value. */
210	STAM_COUNTER_INC(&pVM->tm.s.StatTSCPause);
211	pVM->tm.s.u64LastPausedTSC = pVCpu->tm.s.u64TSC;
212	}
213	return VINF_SUCCESS;
214	}
215	AssertFailed();
216	return VERR_TM_TSC_ALREADY_PAUSED;
217	}
218
219
220	#ifdef VBOX_WITH_STATISTICS
221	/**
222	* Record why we refused to use offsetted TSC.
223	*
224	* Used by TMCpuTickCanUseRealTSC() and TMCpuTickGetDeadlineAndTscOffset().
225	*
226	* @param pVM The cross context VM structure.
227	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
228	*/
229	DECLINLINE(void) tmCpuTickRecordOffsettedTscRefusal(PVM pVM, PVMCPU pVCpu)
230	{
231	/* Sample the reason for refusing. */
232	if (pVM->tm.s.enmTSCMode != TMTSCMODE_DYNAMIC)
233	STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotFixed);
234	else if (!pVCpu->tm.s.fTSCTicking)
235	STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotTicking);
236	else if (pVM->tm.s.enmTSCMode != TMTSCMODE_REAL_TSC_OFFSET)
237	{
238	if (pVM->tm.s.fVirtualSyncCatchUp)
239	{
240	if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 10)
241	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE010);
242	else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 25)
243	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE025);
244	else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 100)
245	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE100);
246	else
247	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupOther);
248	}
249	else if (!pVM->tm.s.fVirtualSyncTicking)
250	STAM_COUNTER_INC(&pVM->tm.s.StatTSCSyncNotTicking);
251	else if (pVM->tm.s.fVirtualWarpDrive)
252	STAM_COUNTER_INC(&pVM->tm.s.StatTSCWarp);
253	}
254	}
255	#endif /* VBOX_WITH_STATISTICS */
256
257
258	/**
259	* Checks if AMD-V / VT-x can use an offsetted hardware TSC or not.
260	*
261	* @returns true/false accordingly.
262	* @param pVM The cross context VM structure.
263	* @param pVCpu The cross context virtual CPU structure.
264	* @param poffRealTsc The offset against the TSC of the current host CPU,
265	* if pfOffsettedTsc is set to true.
266	* @param pfParavirtTsc Where to return whether paravirt TSC is enabled.
267	*
268	* @thread EMT(pVCpu).
269	* @see TMCpuTickGetDeadlineAndTscOffset().
270	*/
271	VMM_INT_DECL(bool) TMCpuTickCanUseRealTSC(PVM pVM, PVMCPU pVCpu, uint64_t poffRealTsc, bool pfParavirtTsc)
272	{
273	Assert(pVCpu->tm.s.fTSCTicking \|\| DBGFIsStepping(pVCpu));
274
275	*pfParavirtTsc = pVM->tm.s.fParavirtTscEnabled;
276
277	/*
278	* In real TSC mode it's easy, we just need the delta & offTscRawSrc and
279	* the CPU will add them to RDTSC and RDTSCP at runtime.
280	*
281	* In tmCpuTickGetInternal we do:
282	* SUPReadTsc() - pVCpu->tm.s.offTSCRawSrc;
283	* Where SUPReadTsc() does:
284	* ASMReadTSC() - pGipCpu->i64TscDelta;
285	* Which means tmCpuTickGetInternal actually does:
286	* ASMReadTSC() - pGipCpu->i64TscDelta - pVCpu->tm.s.offTSCRawSrc;
287	* So, the offset to be ADDED to RDTSC[P] is:
288	* offRealTsc = -(pGipCpu->i64TscDelta + pVCpu->tm.s.offTSCRawSrc)
289	*/
290	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
291	{
292	/** @todo We should negate both deltas! It's soo weird that we do the
293	* exact opposite of what the hardware implements. */
294	#ifdef IN_RING3
295	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDelta();
296	#else
297	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet);
298	#endif
299	return true;
300	}
301
302	/*
303	* We require:
304	* 1. A fixed TSC, this is checked at init time.
305	* 2. That the TSC is ticking (we shouldn't be here if it isn't)
306	* 3. Either that we're using the real TSC as time source or
307	* a) we don't have any lag to catch up, and
308	* b) the virtual sync clock hasn't been halted by an expired timer, and
309	* c) we're not using warp drive (accelerated virtual guest time).
310	*/
311	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_DYNAMIC
312	&& !pVM->tm.s.fVirtualSyncCatchUp
313	&& RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
314	&& !pVM->tm.s.fVirtualWarpDrive)
315	{
316	/* The source is the timer synchronous virtual clock. */
317	uint64_t u64Now = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
318	- pVCpu->tm.s.offTSCRawSrc;
319	/** @todo When we start collecting statistics on how much time we spend executing
320	* guest code before exiting, we should check this against the next virtual sync
321	* timer timeout. If it's lower than the avg. length, we should trap rdtsc to increase
322	* the chance that we'll get interrupted right after the timer expired. */
323	if (u64Now >= pVCpu->tm.s.u64TSCLastSeen)
324	{
325	*poffRealTsc = u64Now - ASMReadTSC();
326	return true; /** @todo count this? */
327	}
328	}
329
330	#ifdef VBOX_WITH_STATISTICS
331	tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
332	#endif
333	return false;
334	}
335
336
337	/**
338	* Calculates the number of host CPU ticks till the next virtual sync deadline.
339	*
340	* @note To save work, this function will not bother calculating the accurate
341	* tick count for deadlines that are more than a second ahead.
342	*
343	* @returns The number of host cpu ticks to the next deadline. Max one second.
344	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
345	* @param cNsToDeadline The number of nano seconds to the next virtual
346	* sync deadline.
347	*/
348	DECLINLINE(uint64_t) tmCpuCalcTicksToDeadline(PVMCPU pVCpu, uint64_t cNsToDeadline)
349	{
350	AssertCompile(TMCLOCK_FREQ_VIRTUAL <= _4G);
351	#ifdef IN_RING3
352	RT_NOREF_PV(pVCpu);
353	uint64_t uCpuHz = SUPGetCpuHzFromGip(g_pSUPGlobalInfoPage);
354	#else
355	uint64_t uCpuHz = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, pVCpu->iHostCpuSet);
356	#endif
357	if (RT_UNLIKELY(cNsToDeadline >= TMCLOCK_FREQ_VIRTUAL))
358	return uCpuHz;
359	uint64_t cTicks = ASMMultU64ByU32DivByU32(uCpuHz, cNsToDeadline, TMCLOCK_FREQ_VIRTUAL);
360	if (cTicks > 4000)
361	cTicks -= 4000; /* fudge to account for overhead */
362	else
363	cTicks >>= 1;
364	return cTicks;
365	}
366
367
368	/**
369	* Gets the next deadline in host CPU clock ticks and the TSC offset if we can
370	* use the raw TSC.
371	*
372	* @returns The number of host CPU clock ticks to the next timer deadline.
373	* @param pVM The cross context VM structure.
374	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
375	* @param poffRealTsc The offset against the TSC of the current host CPU,
376	* if pfOffsettedTsc is set to true.
377	* @param pfOffsettedTsc Where to return whether TSC offsetting can be used.
378	* @param pfParavirtTsc Where to return whether paravirt TSC is enabled.
379	*
380	* @thread EMT(pVCpu).
381	* @see TMCpuTickCanUseRealTSC().
382	*/
383	VMM_INT_DECL(uint64_t) TMCpuTickGetDeadlineAndTscOffset(PVM pVM, PVMCPU pVCpu, uint64_t *poffRealTsc,
384	bool pfOffsettedTsc, bool pfParavirtTsc)
385	{
386	Assert(pVCpu->tm.s.fTSCTicking \|\| DBGFIsStepping(pVCpu));
387
388	*pfParavirtTsc = pVM->tm.s.fParavirtTscEnabled;
389
390	/*
391	* Same logic as in TMCpuTickCanUseRealTSC.
392	*/
393	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
394	{
395	/** @todo We should negate both deltas! It's soo weird that we do the
396	* exact opposite of what the hardware implements. */
397	#ifdef IN_RING3
398	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDelta();
399	#else
400	*poffRealTsc = 0 - pVCpu->tm.s.offTSCRawSrc - SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet);
401	#endif
402	*pfOffsettedTsc = true;
403	return tmCpuCalcTicksToDeadline(pVCpu, TMVirtualSyncGetNsToDeadline(pVM));
404	}
405
406	/*
407	* Same logic as in TMCpuTickCanUseRealTSC.
408	*/
409	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_DYNAMIC
410	&& !pVM->tm.s.fVirtualSyncCatchUp
411	&& RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
412	&& !pVM->tm.s.fVirtualWarpDrive)
413	{
414	/* The source is the timer synchronous virtual clock. */
415	uint64_t cNsToDeadline;
416	uint64_t u64NowVirtSync = TMVirtualSyncGetWithDeadlineNoCheck(pVM, &cNsToDeadline);
417	uint64_t u64Now = ASMMultU64ByU32DivByU32(u64NowVirtSync, pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL);
418	u64Now -= pVCpu->tm.s.offTSCRawSrc;
419	*poffRealTsc = u64Now - ASMReadTSC();
420	*pfOffsettedTsc = u64Now >= pVCpu->tm.s.u64TSCLastSeen;
421	return tmCpuCalcTicksToDeadline(pVCpu, cNsToDeadline);
422	}
423
424	#ifdef VBOX_WITH_STATISTICS
425	tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
426	#endif
427	*pfOffsettedTsc = false;
428	*poffRealTsc = 0;
429	return tmCpuCalcTicksToDeadline(pVCpu, TMVirtualSyncGetNsToDeadline(pVM));
430	}
431
432
433	/**
434	* Read the current CPU timestamp counter.
435	*
436	* @returns Gets the CPU tsc.
437	* @param pVCpu The cross context virtual CPU structure.
438	* @param fCheckTimers Whether to check timers.
439	*/
440	DECLINLINE(uint64_t) tmCpuTickGetInternal(PVMCPU pVCpu, bool fCheckTimers)
441	{
442	uint64_t u64;
443
444	if (RT_LIKELY(pVCpu->tm.s.fTSCTicking))
445	{
446	PVM pVM = pVCpu->CTX_SUFF(pVM);
447	switch (pVM->tm.s.enmTSCMode)
448	{
449	case TMTSCMODE_REAL_TSC_OFFSET:
450	u64 = SUPReadTsc();
451	break;
452	case TMTSCMODE_VIRT_TSC_EMULATED:
453	case TMTSCMODE_DYNAMIC:
454	u64 = tmCpuTickGetRawVirtual(pVM, fCheckTimers);
455	break;
456	#ifndef IN_RC
457	case TMTSCMODE_NATIVE_API:
458	{
459	u64 = 0;
460	int rcNem = NEMHCQueryCpuTick(pVCpu, &u64, NULL);
461	AssertLogRelRCReturn(rcNem, SUPReadTsc());
462	break;
463	}
464	#endif
465	default:
466	AssertFailedBreakStmt(u64 = SUPReadTsc());
467	}
468	u64 -= pVCpu->tm.s.offTSCRawSrc;
469
470	/* Always return a value higher than what the guest has already seen. */
471	if (RT_LIKELY(u64 > pVCpu->tm.s.u64TSCLastSeen))
472	pVCpu->tm.s.u64TSCLastSeen = u64;
473	else
474	{
475	STAM_COUNTER_INC(&pVM->tm.s.StatTSCUnderflow);
476	pVCpu->tm.s.u64TSCLastSeen += 64; /** @todo choose a good increment here */
477	u64 = pVCpu->tm.s.u64TSCLastSeen;
478	}
479	}
480	else
481	u64 = pVCpu->tm.s.u64TSC;
482	/** @todo @bugref{7243}: SVM TSC offset. */
483	return u64;
484	}
485
486
487	/**
488	* Read the current CPU timestamp counter.
489	*
490	* @returns Gets the CPU tsc.
491	* @param pVCpu The cross context virtual CPU structure.
492	*/
493	VMMDECL(uint64_t) TMCpuTickGet(PVMCPU pVCpu)
494	{
495	return tmCpuTickGetInternal(pVCpu, true /* fCheckTimers */);
496	}
497
498
499	/**
500	* Read the current CPU timestamp counter, don't check for expired timers.
501	*
502	* @returns Gets the CPU tsc.
503	* @param pVCpu The cross context virtual CPU structure.
504	*/
505	VMM_INT_DECL(uint64_t) TMCpuTickGetNoCheck(PVMCPU pVCpu)
506	{
507	return tmCpuTickGetInternal(pVCpu, false /* fCheckTimers */);
508	}
509
510
511	/**
512	* Sets the current CPU timestamp counter.
513	*
514	* @returns VBox status code.
515	* @param pVM The cross context VM structure.
516	* @param pVCpu The cross context virtual CPU structure.
517	* @param u64Tick The new timestamp value.
518	*
519	* @thread EMT which TSC is to be set.
520	*/
521	VMM_INT_DECL(int) TMCpuTickSet(PVM pVM, PVMCPU pVCpu, uint64_t u64Tick)
522	{
523	VMCPU_ASSERT_EMT(pVCpu);
524	STAM_COUNTER_INC(&pVM->tm.s.StatTSCSet);
525
526	/*
527	* This is easier to do when the TSC is paused since resume will
528	* do all the calculations for us. Actually, we don't need to
529	* call tmCpuTickPause here since we overwrite u64TSC anyway.
530	*/
531	bool fTSCTicking = pVCpu->tm.s.fTSCTicking;
532	pVCpu->tm.s.fTSCTicking = false;
533	pVCpu->tm.s.u64TSC = u64Tick;
534	pVCpu->tm.s.u64TSCLastSeen = u64Tick;
535	if (fTSCTicking)
536	tmCpuTickResume(pVM, pVCpu);
537	/** @todo Try help synchronizing it better among the virtual CPUs? */
538
539	return VINF_SUCCESS;
540	}
541
542	/**
543	* Sets the last seen CPU timestamp counter.
544	*
545	* @returns VBox status code.
546	* @param pVCpu The cross context virtual CPU structure.
547	* @param u64LastSeenTick The last seen timestamp value.
548	*
549	* @thread EMT which TSC is to be set.
550	*/
551	VMM_INT_DECL(int) TMCpuTickSetLastSeen(PVMCPU pVCpu, uint64_t u64LastSeenTick)
552	{
553	VMCPU_ASSERT_EMT(pVCpu);
554
555	LogFlow(("TMCpuTickSetLastSeen %RX64\n", u64LastSeenTick));
556	if (pVCpu->tm.s.u64TSCLastSeen < u64LastSeenTick)
557	pVCpu->tm.s.u64TSCLastSeen = u64LastSeenTick;
558	return VINF_SUCCESS;
559	}
560
561	/**
562	* Gets the last seen CPU timestamp counter of the guest.
563	*
564	* @returns the last seen TSC.
565	* @param pVCpu The cross context virtual CPU structure.
566	*
567	* @thread EMT(pVCpu).
568	*/
569	VMM_INT_DECL(uint64_t) TMCpuTickGetLastSeen(PVMCPU pVCpu)
570	{
571	VMCPU_ASSERT_EMT(pVCpu);
572
573	return pVCpu->tm.s.u64TSCLastSeen;
574	}
575
576
577	/**
578	* Get the timestamp frequency.
579	*
580	* @returns Number of ticks per second.
581	* @param pVM The cross context VM structure.
582	*/
583	VMMDECL(uint64_t) TMCpuTicksPerSecond(PVM pVM)
584	{
585	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET
586	&& g_pSUPGlobalInfoPage->u32Mode != SUPGIPMODE_INVARIANT_TSC)
587	{
588	#ifdef IN_RING3
589	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGip(g_pSUPGlobalInfoPage);
590	#elif defined(IN_RING0)
591	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, RTMpCpuIdToSetIndex(RTMpCpuId()));
592	#else
593	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, VMMGetCpu(pVM)->iHostCpuSet);
594	#endif
595	if (RT_LIKELY(cTSCTicksPerSecond != ~(uint64_t)0))
596	return cTSCTicksPerSecond;
597	}
598	return pVM->tm.s.cTSCTicksPerSecond;
599	}
600
601
602	/**
603	* Whether the TSC is ticking for the VCPU.
604	*
605	* @returns true if ticking, false otherwise.
606	* @param pVCpu The cross context virtual CPU structure.
607	*/
608	VMM_INT_DECL(bool) TMCpuTickIsTicking(PVMCPU pVCpu)
609	{
610	return pVCpu->tm.s.fTSCTicking;
611	}
612

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source: vbox/trunk/src/VBox/VMM/VMMAll/TMAllCpu.cpp@ 74157

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