TMAllCpu.cpp@ 96945

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1	/* $Id: TMAllCpu.cpp 96407 2022-08-22 17:43:14Z vboxsync $ */
2	/** @file
3	* TM - Timeout Manager, CPU Time, All Contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2022 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_TM
33	#include <VBox/vmm/tm.h>
34	#include <VBox/vmm/gim.h>
35	#include <VBox/vmm/dbgf.h>
36	#include <VBox/vmm/nem.h>
37	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
38	# include <iprt/asm-amd64-x86.h> /* for SUPGetCpuHzFromGIP; ASMReadTSC */
39	#elif defined(RT_ARCH_ARM64) \|\| defined(RT_ARCH_ARM32)
40	# include <iprt/asm-arm.h>
41	#endif
42	#include "TMInternal.h"
43	#include <VBox/vmm/vmcc.h>
44	#include <VBox/sup.h>
45
46	#include <VBox/param.h>
47	#include <VBox/err.h>
48	#include <iprt/asm-math.h>
49	#include <iprt/assert.h>
50	#include <VBox/log.h>
51
52
53
54	/**
55	* Converts from virtual time to raw CPU ticks.
56	*
57	* Mainly to have the ASMMultU64ByU32DivByU32 overflow trickery in one place.
58	*
59	* @returns raw CPU ticks.
60	* @param pVM The cross context VM structure.
61	* @param u64VirtualTime The virtual time to convert.
62	*/
63	DECLINLINE(uint64_t) tmCpuTickCalcFromVirtual(PVMCC pVM, uint64_t u64VirtualTime)
64	{
65	if (pVM->tm.s.cTSCTicksPerSecond <= UINT32_MAX)
66	return ASMMultU64ByU32DivByU32(u64VirtualTime, (uint32_t)pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL);
67	Assert(pVM->tm.s.cTSCTicksPerSecond <= ((uint64_t)UINT32_MAX << 2)); /* <= 15.99 GHz */
68	return ASMMultU64ByU32DivByU32(u64VirtualTime, (uint32_t)(pVM->tm.s.cTSCTicksPerSecond >> 2), TMCLOCK_FREQ_VIRTUAL >> 2);
69	}
70
71
72	/**
73	* Gets the raw cpu tick from current virtual time.
74	*
75	* @param pVM The cross context VM structure.
76	* @param fCheckTimers Whether to check timers.
77	*/
78	DECLINLINE(uint64_t) tmCpuTickGetRawVirtual(PVMCC pVM, bool fCheckTimers)
79	{
80	if (fCheckTimers)
81	return tmCpuTickCalcFromVirtual(pVM, TMVirtualSyncGet(pVM));
82	return tmCpuTickCalcFromVirtual(pVM, TMVirtualSyncGetNoCheck(pVM));
83	}
84
85
86	#ifdef IN_RING3
87	/**
88	* Used by tmR3CpuTickParavirtEnable and tmR3CpuTickParavirtDisable.
89	*
90	* @param pVM The cross context VM structure.
91	*/
92	uint64_t tmR3CpuTickGetRawVirtualNoCheck(PVM pVM)
93	{
94	return tmCpuTickGetRawVirtual(pVM, false /fCheckTimers/);
95	}
96	#endif
97
98
99	/**
100	* Resumes the CPU timestamp counter ticking.
101	*
102	* @returns VBox status code.
103	* @param pVM The cross context VM structure.
104	* @param pVCpu The cross context virtual CPU structure.
105	* @internal
106	*/
107	int tmCpuTickResume(PVMCC pVM, PVMCPUCC pVCpu)
108	{
109	if (!pVCpu->tm.s.fTSCTicking)
110	{
111	pVCpu->tm.s.fTSCTicking = true;
112
113	/** @todo Test that pausing and resuming doesn't cause lag! (I.e. that we're
114	* unpaused before the virtual time and stopped after it. */
115	switch (pVM->tm.s.enmTSCMode)
116	{
117	case TMTSCMODE_REAL_TSC_OFFSET:
118	pVCpu->tm.s.offTSCRawSrc = SUPReadTsc() - pVCpu->tm.s.u64TSC;
119	break;
120	case TMTSCMODE_VIRT_TSC_EMULATED:
121	case TMTSCMODE_DYNAMIC:
122	pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
123	- pVCpu->tm.s.u64TSC;
124	break;
125	case TMTSCMODE_NATIVE_API:
126	pVCpu->tm.s.offTSCRawSrc = 0; /** @todo ?? */
127	/* Looks like this is only used by weird modes and MSR TSC writes. We cannot support either on NEM/win. */
128	break;
129	default:
130	AssertFailedReturn(VERR_IPE_NOT_REACHED_DEFAULT_CASE);
131	}
132	return VINF_SUCCESS;
133	}
134	AssertFailed();
135	return VERR_TM_TSC_ALREADY_TICKING;
136	}
137
138
139	/**
140	* Resumes the CPU timestamp counter ticking.
141	*
142	* @returns VINF_SUCCESS or VERR_TM_VIRTUAL_TICKING_IPE (asserted).
143	* @param pVM The cross context VM structure.
144	* @param pVCpu The cross context virtual CPU structure.
145	*/
146	int tmCpuTickResumeLocked(PVMCC pVM, PVMCPUCC pVCpu)
147	{
148	if (!pVCpu->tm.s.fTSCTicking)
149	{
150	/* TSC must be ticking before calling tmCpuTickGetRawVirtual()! */
151	pVCpu->tm.s.fTSCTicking = true;
152	uint32_t c = ASMAtomicIncU32(&pVM->tm.s.cTSCsTicking);
153	AssertMsgReturn(c <= pVM->cCpus, ("%u vs %u\n", c, pVM->cCpus), VERR_TM_VIRTUAL_TICKING_IPE);
154	if (c == 1)
155	{
156	/* The first VCPU to resume. */
157	uint64_t offTSCRawSrcOld = pVCpu->tm.s.offTSCRawSrc;
158
159	STAM_COUNTER_INC(&pVM->tm.s.StatTSCResume);
160
161	/* When resuming, use the TSC value of the last stopped VCPU to avoid the TSC going back. */
162	switch (pVM->tm.s.enmTSCMode)
163	{
164	case TMTSCMODE_REAL_TSC_OFFSET:
165	pVCpu->tm.s.offTSCRawSrc = SUPReadTsc() - pVM->tm.s.u64LastPausedTSC;
166	break;
167	case TMTSCMODE_VIRT_TSC_EMULATED:
168	case TMTSCMODE_DYNAMIC:
169	pVCpu->tm.s.offTSCRawSrc = tmCpuTickGetRawVirtual(pVM, false /* don't check for pending timers */)
170	- pVM->tm.s.u64LastPausedTSC;
171	break;
172	case TMTSCMODE_NATIVE_API:
173	{
174	int rc = NEMHCResumeCpuTickOnAll(pVM, pVCpu, pVM->tm.s.u64LastPausedTSC);
175	AssertRCReturn(rc, rc);
176	pVCpu->tm.s.offTSCRawSrc = offTSCRawSrcOld = 0;
177	break;
178	}
179	default:
180	AssertFailedReturn(VERR_IPE_NOT_REACHED_DEFAULT_CASE);
181	}
182
183	/* Calculate the offset addendum for other VCPUs to use. */
184	pVM->tm.s.offTSCPause = pVCpu->tm.s.offTSCRawSrc - offTSCRawSrcOld;
185	}
186	else
187	{
188	/* All other VCPUs (if any). */
189	pVCpu->tm.s.offTSCRawSrc += pVM->tm.s.offTSCPause;
190	}
191	}
192	return VINF_SUCCESS;
193	}
194
195
196	/**
197	* Pauses the CPU timestamp counter ticking.
198	*
199	* @returns VBox status code.
200	* @param pVCpu The cross context virtual CPU structure.
201	* @internal
202	*/
203	int tmCpuTickPause(PVMCPUCC pVCpu)
204	{
205	if (pVCpu->tm.s.fTSCTicking)
206	{
207	pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
208	pVCpu->tm.s.fTSCTicking = false;
209	return VINF_SUCCESS;
210	}
211	AssertFailed();
212	return VERR_TM_TSC_ALREADY_PAUSED;
213	}
214
215
216	/**
217	* Pauses the CPU timestamp counter ticking.
218	*
219	* @returns VBox status code.
220	* @param pVM The cross context VM structure.
221	* @param pVCpu The cross context virtual CPU structure.
222	* @internal
223	*/
224	int tmCpuTickPauseLocked(PVMCC pVM, PVMCPUCC pVCpu)
225	{
226	if (pVCpu->tm.s.fTSCTicking)
227	{
228	pVCpu->tm.s.u64TSC = TMCpuTickGetNoCheck(pVCpu);
229	pVCpu->tm.s.fTSCTicking = false;
230
231	uint32_t c = ASMAtomicDecU32(&pVM->tm.s.cTSCsTicking);
232	AssertMsgReturn(c < pVM->cCpus, ("%u vs %u\n", c, pVM->cCpus), VERR_TM_VIRTUAL_TICKING_IPE);
233	if (c == 0)
234	{
235	/* When the last TSC stops, remember the value. */
236	STAM_COUNTER_INC(&pVM->tm.s.StatTSCPause);
237	pVM->tm.s.u64LastPausedTSC = pVCpu->tm.s.u64TSC;
238	}
239	return VINF_SUCCESS;
240	}
241	AssertFailed();
242	return VERR_TM_TSC_ALREADY_PAUSED;
243	}
244
245
246	#ifdef IN_RING0 /* Only used in ring-0 at present (AMD-V and VT-x). */
247
248	# ifdef VBOX_WITH_STATISTICS
249	/**
250	* Record why we refused to use offsetted TSC.
251	*
252	* Used by TMCpuTickCanUseRealTSC() and TMCpuTickGetDeadlineAndTscOffset().
253	*
254	* @param pVM The cross context VM structure.
255	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
256	*/
257	DECLINLINE(void) tmCpuTickRecordOffsettedTscRefusal(PVM pVM, PVMCPU pVCpu)
258	{
259	/* Sample the reason for refusing. */
260	if (pVM->tm.s.enmTSCMode != TMTSCMODE_DYNAMIC)
261	STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotFixed);
262	else if (!pVCpu->tm.s.fTSCTicking)
263	STAM_COUNTER_INC(&pVM->tm.s.StatTSCNotTicking);
264	else if (pVM->tm.s.enmTSCMode != TMTSCMODE_REAL_TSC_OFFSET)
265	{
266	if (pVM->tm.s.fVirtualSyncCatchUp)
267	{
268	if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 10)
269	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE010);
270	else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 25)
271	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE025);
272	else if (pVM->tm.s.u32VirtualSyncCatchUpPercentage <= 100)
273	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupLE100);
274	else
275	STAM_COUNTER_INC(&pVM->tm.s.StatTSCCatchupOther);
276	}
277	else if (!pVM->tm.s.fVirtualSyncTicking)
278	STAM_COUNTER_INC(&pVM->tm.s.StatTSCSyncNotTicking);
279	else if (pVM->tm.s.fVirtualWarpDrive)
280	STAM_COUNTER_INC(&pVM->tm.s.StatTSCWarp);
281	}
282	}
283	# endif /* VBOX_WITH_STATISTICS */
284
285	/**
286	* Checks if AMD-V / VT-x can use an offsetted hardware TSC or not.
287	*
288	* @returns true/false accordingly.
289	* @param pVM The cross context VM structure.
290	* @param pVCpu The cross context virtual CPU structure.
291	* @param poffRealTsc The offset against the TSC of the current host CPU,
292	* if pfOffsettedTsc is set to true.
293	* @param pfParavirtTsc Where to return whether paravirt TSC is enabled.
294	*
295	* @thread EMT(pVCpu).
296	* @see TMCpuTickGetDeadlineAndTscOffset().
297	*/
298	VMM_INT_DECL(bool) TMCpuTickCanUseRealTSC(PVMCC pVM, PVMCPUCC pVCpu, uint64_t poffRealTsc, bool pfParavirtTsc)
299	{
300	Assert(pVCpu->tm.s.fTSCTicking \|\| DBGFIsStepping(pVCpu));
301
302	*pfParavirtTsc = pVM->tm.s.fParavirtTscEnabled;
303
304	/*
305	* In real TSC mode it's easy, we just need the delta & offTscRawSrc and
306	* the CPU will add them to RDTSC and RDTSCP at runtime.
307	*
308	* In tmCpuTickGetInternal we do:
309	* SUPReadTsc() - pVCpu->tm.s.offTSCRawSrc;
310	* Where SUPReadTsc() does:
311	* ASMReadTSC() - pGipCpu->i64TscDelta;
312	* Which means tmCpuTickGetInternal actually does:
313	* ASMReadTSC() - pGipCpu->i64TscDelta - pVCpu->tm.s.offTSCRawSrc;
314	* So, the offset to be ADDED to RDTSC[P] is:
315	* offRealTsc = -(pGipCpu->i64TscDelta + pVCpu->tm.s.offTSCRawSrc)
316	*/
317	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
318	{
319	/** @todo We should negate both deltas! It's soo weird that we do the
320	* exact opposite of what the hardware implements. */
321	# ifdef IN_RING3
322	*poffRealTsc = (uint64_t)0 - pVCpu->tm.s.offTSCRawSrc - (uint64_t)SUPGetTscDelta(g_pSUPGlobalInfoPage);
323	# else
324	*poffRealTsc = (uint64_t)0 - pVCpu->tm.s.offTSCRawSrc - (uint64_t)SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet);
325	# endif
326	return true;
327	}
328
329	/*
330	* We require:
331	* 1. A fixed TSC, this is checked at init time.
332	* 2. That the TSC is ticking (we shouldn't be here if it isn't)
333	* 3. Either that we're using the real TSC as time source or
334	* a) we don't have any lag to catch up, and
335	* b) the virtual sync clock hasn't been halted by an expired timer, and
336	* c) we're not using warp drive (accelerated virtual guest time).
337	*/
338	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_DYNAMIC
339	&& !pVM->tm.s.fVirtualSyncCatchUp
340	&& RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
341	&& !pVM->tm.s.fVirtualWarpDrive)
342	{
343	/* The source is the timer synchronous virtual clock. */
344	uint64_t uTscNow;
345	uint64_t u64Now = tmCpuTickCalcFromVirtual(pVM, TMVirtualSyncGetNoCheckWithTsc(pVM, &uTscNow))
346	- pVCpu->tm.s.offTSCRawSrc;
347	/** @todo When we start collecting statistics on how much time we spend executing
348	* guest code before exiting, we should check this against the next virtual sync
349	* timer timeout. If it's lower than the avg. length, we should trap rdtsc to increase
350	* the chance that we'll get interrupted right after the timer expired. */
351	if (u64Now >= pVCpu->tm.s.u64TSCLastSeen)
352	{
353	# ifdef IN_RING3
354	*poffRealTsc = u64Now - (uTscNow + (uint64_t)SUPGetTscDelta(g_pSUPGlobalInfoPage);
355	# else
356	*poffRealTsc = u64Now - (uTscNow + (uint64_t)SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet));
357	# endif
358	return true; /** @todo count this? */
359	}
360	}
361
362	# ifdef VBOX_WITH_STATISTICS
363	tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
364	# endif
365	return false;
366	}
367
368
369	/**
370	* Calculates the number of host CPU ticks till the next virtual sync deadline.
371	*
372	* @note To save work, this function will not bother calculating the accurate
373	* tick count for deadlines that are more than a second ahead.
374	*
375	* @returns The number of host cpu ticks to the next deadline. Max one second.
376	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
377	* @param cNsToDeadline The number of nano seconds to the next virtual
378	* sync deadline.
379	*/
380	DECLINLINE(uint64_t) tmCpuCalcTicksToDeadline(PVMCPUCC pVCpu, uint64_t cNsToDeadline)
381	{
382	AssertCompile(TMCLOCK_FREQ_VIRTUAL <= _4G);
383	# ifdef IN_RING3
384	RT_NOREF_PV(pVCpu);
385	PSUPGIP const pGip = g_pSUPGlobalInfoPage;
386	uint64_t uCpuHz = pGip ? SUPGetCpuHzFromGip(pGip) : pVCpu->pVMR3->tm.s.cTSCTicksPerSecondHost;
387	# else
388	uint64_t uCpuHz = SUPGetCpuHzFromGipBySetIndex(g_pSUPGlobalInfoPage, pVCpu->iHostCpuSet);
389	# endif
390	if (RT_UNLIKELY(cNsToDeadline >= TMCLOCK_FREQ_VIRTUAL))
391	return uCpuHz;
392	AssertCompile(TMCLOCK_FREQ_VIRTUAL <= UINT32_MAX);
393	uint64_t cTicks = ASMMultU64ByU32DivByU32(uCpuHz, (uint32_t)cNsToDeadline, TMCLOCK_FREQ_VIRTUAL);
394	if (cTicks > 4000)
395	cTicks -= 4000; /* fudge to account for overhead */
396	else
397	cTicks >>= 1;
398	return cTicks;
399	}
400
401
402	/**
403	* Gets the next deadline in host CPU clock ticks and the TSC offset if we can
404	* use the raw TSC.
405	*
406	* @returns The number of host CPU clock ticks to the next timer deadline.
407	* @param pVM The cross context VM structure.
408	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
409	* @param poffRealTsc The offset against the TSC of the current host CPU,
410	* if pfOffsettedTsc is set to true.
411	* @param pfOffsettedTsc Where to return whether TSC offsetting can be used.
412	* @param pfParavirtTsc Where to return whether paravirt TSC is enabled.
413	* @param puTscNow Where to return the TSC value that the return
414	* value is relative to. This is delta adjusted.
415	* @param puDeadlineVersion Where to return the deadline "version" number.
416	* Use with TMVirtualSyncIsCurrentDeadlineVersion()
417	* to check if the absolute deadline is still up to
418	* date and the caller can skip calling this
419	* function.
420	*
421	* @thread EMT(pVCpu).
422	* @see TMCpuTickCanUseRealTSC().
423	*/
424	VMM_INT_DECL(uint64_t) TMCpuTickGetDeadlineAndTscOffset(PVMCC pVM, PVMCPUCC pVCpu, uint64_t *poffRealTsc,
425	bool pfOffsettedTsc, bool pfParavirtTsc,
426	uint64_t puTscNow, uint64_t puDeadlineVersion)
427	{
428	Assert(pVCpu->tm.s.fTSCTicking \|\| DBGFIsStepping(pVCpu));
429
430	*pfParavirtTsc = pVM->tm.s.fParavirtTscEnabled;
431
432	/*
433	* Same logic as in TMCpuTickCanUseRealTSC.
434	*/
435	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
436	{
437	/** @todo We should negate both deltas! It's soo weird that we do the
438	* exact opposite of what the hardware implements. */
439	# ifdef IN_RING3
440	*poffRealTsc = (uint64_t)0 - pVCpu->tm.s.offTSCRawSrc - (uint64_t)SUPGetTscDelta(g_pSUPGlobalInfoPage);
441	# else
442	*poffRealTsc = (uint64_t)0 - pVCpu->tm.s.offTSCRawSrc - (uint64_t)SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet);
443	# endif
444	*pfOffsettedTsc = true;
445	return tmCpuCalcTicksToDeadline(pVCpu, TMVirtualSyncGetNsToDeadline(pVM, puDeadlineVersion, puTscNow));
446	}
447
448	/*
449	* Same logic as in TMCpuTickCanUseRealTSC.
450	*/
451	if ( pVM->tm.s.enmTSCMode == TMTSCMODE_DYNAMIC
452	&& !pVM->tm.s.fVirtualSyncCatchUp
453	&& RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
454	&& !pVM->tm.s.fVirtualWarpDrive)
455	{
456	/* The source is the timer synchronous virtual clock. */
457	uint64_t cNsToDeadline;
458	uint64_t u64NowVirtSync = TMVirtualSyncGetWithDeadlineNoCheck(pVM, &cNsToDeadline, puDeadlineVersion, puTscNow);
459	uint64_t u64Now = tmCpuTickCalcFromVirtual(pVM, u64NowVirtSync);
460	u64Now -= pVCpu->tm.s.offTSCRawSrc;
461
462	# ifdef IN_RING3
463	poffRealTsc = u64Now - (puTscNow + (uint64_t)SUPGetTscDelta(g_pSUPGlobalInfoPage)); /* undoing delta */
464	# else
465	poffRealTsc = u64Now - (puTscNow + (uint64_t)SUPGetTscDeltaByCpuSetIndex(pVCpu->iHostCpuSet)); /* undoing delta */
466	# endif
467	*pfOffsettedTsc = u64Now >= pVCpu->tm.s.u64TSCLastSeen;
468	return tmCpuCalcTicksToDeadline(pVCpu, cNsToDeadline);
469	}
470
471	# ifdef VBOX_WITH_STATISTICS
472	tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
473	# endif
474	*pfOffsettedTsc = false;
475	*poffRealTsc = 0;
476	return tmCpuCalcTicksToDeadline(pVCpu, TMVirtualSyncGetNsToDeadline(pVM, puDeadlineVersion, puTscNow));
477	}
478
479	#endif /* IN_RING0 - at the moment */
480
481	/**
482	* Read the current CPU timestamp counter.
483	*
484	* @returns Gets the CPU tsc.
485	* @param pVCpu The cross context virtual CPU structure.
486	* @param fCheckTimers Whether to check timers.
487	*/
488	DECLINLINE(uint64_t) tmCpuTickGetInternal(PVMCPUCC pVCpu, bool fCheckTimers)
489	{
490	uint64_t u64;
491
492	if (RT_LIKELY(pVCpu->tm.s.fTSCTicking))
493	{
494	PVMCC pVM = pVCpu->CTX_SUFF(pVM);
495	switch (pVM->tm.s.enmTSCMode)
496	{
497	case TMTSCMODE_REAL_TSC_OFFSET:
498	u64 = SUPReadTsc();
499	break;
500	case TMTSCMODE_VIRT_TSC_EMULATED:
501	case TMTSCMODE_DYNAMIC:
502	u64 = tmCpuTickGetRawVirtual(pVM, fCheckTimers);
503	break;
504	case TMTSCMODE_NATIVE_API:
505	{
506	u64 = 0;
507	int rcNem = NEMHCQueryCpuTick(pVCpu, &u64, NULL);
508	AssertLogRelRCReturn(rcNem, SUPReadTsc());
509	break;
510	}
511	default:
512	AssertFailedBreakStmt(u64 = SUPReadTsc());
513	}
514	u64 -= pVCpu->tm.s.offTSCRawSrc;
515
516	/* Always return a value higher than what the guest has already seen. */
517	if (RT_LIKELY(u64 > pVCpu->tm.s.u64TSCLastSeen))
518	pVCpu->tm.s.u64TSCLastSeen = u64;
519	else
520	{
521	STAM_COUNTER_INC(&pVM->tm.s.StatTSCUnderflow);
522	pVCpu->tm.s.u64TSCLastSeen += 64; /** @todo choose a good increment here */
523	u64 = pVCpu->tm.s.u64TSCLastSeen;
524	}
525	}
526	else
527	u64 = pVCpu->tm.s.u64TSC;
528	return u64;
529	}
530
531
532	/**
533	* Read the current CPU timestamp counter.
534	*
535	* @returns Gets the CPU tsc.
536	* @param pVCpu The cross context virtual CPU structure.
537	*/
538	VMMDECL(uint64_t) TMCpuTickGet(PVMCPUCC pVCpu)
539	{
540	return tmCpuTickGetInternal(pVCpu, true /* fCheckTimers */);
541	}
542
543
544	/**
545	* Read the current CPU timestamp counter, don't check for expired timers.
546	*
547	* @returns Gets the CPU tsc.
548	* @param pVCpu The cross context virtual CPU structure.
549	*/
550	VMM_INT_DECL(uint64_t) TMCpuTickGetNoCheck(PVMCPUCC pVCpu)
551	{
552	return tmCpuTickGetInternal(pVCpu, false /* fCheckTimers */);
553	}
554
555
556	/**
557	* Sets the current CPU timestamp counter.
558	*
559	* @returns VBox status code.
560	* @param pVM The cross context VM structure.
561	* @param pVCpu The cross context virtual CPU structure.
562	* @param u64Tick The new timestamp value.
563	*
564	* @thread EMT which TSC is to be set.
565	*/
566	VMM_INT_DECL(int) TMCpuTickSet(PVMCC pVM, PVMCPUCC pVCpu, uint64_t u64Tick)
567	{
568	VMCPU_ASSERT_EMT(pVCpu);
569	STAM_COUNTER_INC(&pVM->tm.s.StatTSCSet);
570
571	/*
572	* This is easier to do when the TSC is paused since resume will
573	* do all the calculations for us. Actually, we don't need to
574	* call tmCpuTickPause here since we overwrite u64TSC anyway.
575	*/
576	bool fTSCTicking = pVCpu->tm.s.fTSCTicking;
577	pVCpu->tm.s.fTSCTicking = false;
578	pVCpu->tm.s.u64TSC = u64Tick;
579	pVCpu->tm.s.u64TSCLastSeen = u64Tick;
580	if (fTSCTicking)
581	tmCpuTickResume(pVM, pVCpu);
582	/** @todo Try help synchronizing it better among the virtual CPUs? */
583
584	return VINF_SUCCESS;
585	}
586
587	/**
588	* Sets the last seen CPU timestamp counter.
589	*
590	* @returns VBox status code.
591	* @param pVCpu The cross context virtual CPU structure.
592	* @param u64LastSeenTick The last seen timestamp value.
593	*
594	* @thread EMT which TSC is to be set.
595	*/
596	VMM_INT_DECL(int) TMCpuTickSetLastSeen(PVMCPUCC pVCpu, uint64_t u64LastSeenTick)
597	{
598	VMCPU_ASSERT_EMT(pVCpu);
599
600	LogFlow(("TMCpuTickSetLastSeen %RX64\n", u64LastSeenTick));
601	/** @todo deal with wraparound! */
602	if (pVCpu->tm.s.u64TSCLastSeen < u64LastSeenTick)
603	pVCpu->tm.s.u64TSCLastSeen = u64LastSeenTick;
604	return VINF_SUCCESS;
605	}
606
607	/**
608	* Gets the last seen CPU timestamp counter of the guest.
609	*
610	* @returns the last seen TSC.
611	* @param pVCpu The cross context virtual CPU structure.
612	*
613	* @thread EMT(pVCpu).
614	*/
615	VMM_INT_DECL(uint64_t) TMCpuTickGetLastSeen(PVMCPUCC pVCpu)
616	{
617	VMCPU_ASSERT_EMT(pVCpu);
618
619	return pVCpu->tm.s.u64TSCLastSeen;
620	}
621
622
623	/**
624	* Get the timestamp frequency.
625	*
626	* @returns Number of ticks per second.
627	* @param pVM The cross context VM structure.
628	*/
629	VMMDECL(uint64_t) TMCpuTicksPerSecond(PVMCC pVM)
630	{
631	if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
632	{
633	PSUPGLOBALINFOPAGE const pGip = g_pSUPGlobalInfoPage;
634	if (pGip && pGip->u32Mode != SUPGIPMODE_INVARIANT_TSC)
635	{
636	#ifdef IN_RING3
637	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGip(pGip);
638	#elif defined(IN_RING0)
639	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGipBySetIndex(pGip, (uint32_t)RTMpCpuIdToSetIndex(RTMpCpuId()));
640	#else
641	uint64_t cTSCTicksPerSecond = SUPGetCpuHzFromGipBySetIndex(pGip, VMMGetCpu(pVM)->iHostCpuSet);
642	#endif
643	if (RT_LIKELY(cTSCTicksPerSecond != ~(uint64_t)0))
644	return cTSCTicksPerSecond;
645	}
646	}
647	return pVM->tm.s.cTSCTicksPerSecond;
648	}
649
650
651	/**
652	* Whether the TSC is ticking for the VCPU.
653	*
654	* @returns true if ticking, false otherwise.
655	* @param pVCpu The cross context virtual CPU structure.
656	*/
657	VMM_INT_DECL(bool) TMCpuTickIsTicking(PVMCPUCC pVCpu)
658	{
659	return pVCpu->tm.s.fTSCTicking;
660	}
661

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source: vbox/trunk/src/VBox/VMM/VMMAll/TMAllCpu.cpp@ 96945

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