TMAllVirtual.cpp@ 17659

Last change on this file since 17659 was 14299, checked in by vboxsync, 16 years ago
Corrected grammos in comments. No code changes.
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1	/* $Id: TMAllVirtual.cpp 14299 2008-11-18 13:25:40Z vboxsync $ */
2	/** @file
3	* TM - Timeout Manager, Virtual Time, All Contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_TM
27	#include <VBox/tm.h>
28	#ifdef IN_RING3
29	# include <VBox/rem.h>
30	# include <iprt/thread.h>
31	#endif
32	#include "TMInternal.h"
33	#include <VBox/vm.h>
34	#include <VBox/err.h>
35	#include <VBox/log.h>
36	#include <VBox/sup.h>
37
38	#include <iprt/time.h>
39	#include <iprt/assert.h>
40	#include <iprt/asm.h>
41
42
43	/*******************************************************************************
44	* Internal Functions *
45	*******************************************************************************/
46	static DECLCALLBACK(int) tmVirtualSetWarpDrive(PVM pVM, uint32_t u32Percent);
47
48
49	/**
50	* Helper function that's used by the assembly routines when something goes bust.
51	*
52	* @param pData Pointer to the data structure.
53	* @param u64NanoTS The calculated nano ts.
54	* @param u64DeltaPrev The delta relative to the previously returned timestamp.
55	* @param u64PrevNanoTS The previously returned timestamp (as it was read it).
56	*/
57	DECLEXPORT(void) tmVirtualNanoTSBad(PRTTIMENANOTSDATA pData, uint64_t u64NanoTS, uint64_t u64DeltaPrev, uint64_t u64PrevNanoTS)
58	{
59	//PVM pVM = (PVM)((uint8_t *)pData - RT_OFFSETOF(VM, CTXALLSUFF(s.tm.VirtualGetRawData)));
60	pData->cBadPrev++;
61	if ((int64_t)u64DeltaPrev < 0)
62	LogRel(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64\n",
63	u64DeltaPrev, u64PrevNanoTS, u64NanoTS));
64	else
65	Log(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64 (debugging?)\n",
66	u64DeltaPrev, u64PrevNanoTS, u64NanoTS));
67	}
68
69
70	/**
71	* Called the first time somebody asks for the time or when the GIP
72	* is mapped/unmapped.
73	*
74	* This should never ever happen.
75	*/
76	DECLEXPORT(uint64_t) tmVirtualNanoTSRediscover(PRTTIMENANOTSDATA pData)
77	{
78	//PVM pVM = (PVM)((uint8_t *)pData - RT_OFFSETOF(VM, CTXALLSUFF(s.tm.VirtualGetRawData)));
79	PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
80	AssertFatalMsgFailed(("pGip=%p u32Magic=%#x\n", pGip, VALID_PTR(pGip) ? pGip->u32Magic : 0));
81	}
82
83
84	#if 1
85
86	/**
87	* Wrapper around the IPRT GIP time methods.
88	*/
89	DECLINLINE(uint64_t) tmVirtualGetRawNanoTS(PVM pVM)
90	{
91	#ifdef IN_RING3
92	return CTXALLSUFF(pVM->tm.s.pfnVirtualGetRaw)(&CTXALLSUFF(pVM->tm.s.VirtualGetRawData));
93	# else /* !IN_RING3 */
94	uint32_t cPrevSteps = pVM->tm.s.CTX_SUFF(VirtualGetRawData).c1nsSteps;
95	uint64_t u64 = pVM->tm.s.CTX_SUFF(pfnVirtualGetRaw)(&pVM->tm.s.CTX_SUFF(VirtualGetRawData));
96	if (cPrevSteps != pVM->tm.s.CTX_SUFF(VirtualGetRawData).c1nsSteps)
97	VM_FF_SET(pVM, VM_FF_TO_R3); /* S10 hack */
98	return u64;
99	# endif /* !IN_RING3 */
100	}
101
102	#else
103
104	/**
105	* This is (mostly) the same as rtTimeNanoTSInternal() except
106	* for the two globals which live in TM.
107	*
108	* @returns Nanosecond timestamp.
109	* @param pVM The VM handle.
110	*/
111	static uint64_t tmVirtualGetRawNanoTS(PVM pVM)
112	{
113	uint64_t u64Delta;
114	uint32_t u32NanoTSFactor0;
115	uint64_t u64TSC;
116	uint64_t u64NanoTS;
117	uint32_t u32UpdateIntervalTSC;
118	uint64_t u64PrevNanoTS;
119
120	/*
121	* Read the GIP data and the previous value.
122	*/
123	for (;;)
124	{
125	uint32_t u32TransactionId;
126	PSUPGLOBALINFOPAGE pGip = g_pSUPGlobalInfoPage;
127	#ifdef IN_RING3
128	if (RT_UNLIKELY(!pGip \|\| pGip->u32Magic != SUPGLOBALINFOPAGE_MAGIC))
129	return RTTimeSystemNanoTS();
130	#endif
131
132	if (pGip->u32Mode != SUPGIPMODE_ASYNC_TSC)
133	{
134	u32TransactionId = pGip->aCPUs[0].u32TransactionId;
135	#ifdef RT_OS_L4
136	Assert((u32TransactionId & 1) == 0);
137	#endif
138	u32UpdateIntervalTSC = pGip->aCPUs[0].u32UpdateIntervalTSC;
139	u64NanoTS = pGip->aCPUs[0].u64NanoTS;
140	u64TSC = pGip->aCPUs[0].u64TSC;
141	u32NanoTSFactor0 = pGip->u32UpdateIntervalNS;
142	u64Delta = ASMReadTSC();
143	u64PrevNanoTS = ASMAtomicReadU64(&pVM->tm.s.u64VirtualRawPrev);
144	if (RT_UNLIKELY( pGip->aCPUs[0].u32TransactionId != u32TransactionId
145	\|\| (u32TransactionId & 1)))
146	continue;
147	}
148	else
149	{
150	/* SUPGIPMODE_ASYNC_TSC */
151	PSUPGIPCPU pGipCpu;
152
153	uint8_t u8ApicId = ASMGetApicId();
154	if (RT_LIKELY(u8ApicId < RT_ELEMENTS(pGip->aCPUs)))
155	pGipCpu = &pGip->aCPUs[u8ApicId];
156	else
157	{
158	AssertMsgFailed(("%x\n", u8ApicId));
159	pGipCpu = &pGip->aCPUs[0];
160	}
161
162	u32TransactionId = pGipCpu->u32TransactionId;
163	#ifdef RT_OS_L4
164	Assert((u32TransactionId & 1) == 0);
165	#endif
166	u32UpdateIntervalTSC = pGipCpu->u32UpdateIntervalTSC;
167	u64NanoTS = pGipCpu->u64NanoTS;
168	u64TSC = pGipCpu->u64TSC;
169	u32NanoTSFactor0 = pGip->u32UpdateIntervalNS;
170	u64Delta = ASMReadTSC();
171	u64PrevNanoTS = ASMAtomicReadU64(&pVM->tm.s.u64VirtualRawPrev);
172	#ifdef IN_RC
173	Assert(!(ASMGetFlags() & X86_EFL_IF));
174	#else
175	if (RT_UNLIKELY(u8ApicId != ASMGetApicId()))
176	continue;
177	if (RT_UNLIKELY( pGipCpu->u32TransactionId != u32TransactionId
178	\|\| (u32TransactionId & 1)))
179	continue;
180	#endif
181	}
182	break;
183	}
184
185	/*
186	* Calc NanoTS delta.
187	*/
188	u64Delta -= u64TSC;
189	if (u64Delta > u32UpdateIntervalTSC)
190	{
191	/*
192	* We've expired the interval, cap it. If we're here for the 2nd
193	* time without any GIP update inbetween, the checks against
194	* pVM->tm.s.u64VirtualRawPrev below will force 1ns stepping.
195	*/
196	u64Delta = u32UpdateIntervalTSC;
197	}
198	#if !defined(_MSC_VER) \|\| defined(RT_ARCH_AMD64) /* GCC makes very pretty code from these two inline calls, while MSC cannot. */
199	u64Delta = ASMMult2xU32RetU64((uint32_t)u64Delta, u32NanoTSFactor0);
200	u64Delta = ASMDivU64ByU32RetU32(u64Delta, u32UpdateIntervalTSC);
201	#else
202	__asm
203	{
204	mov eax, dword ptr [u64Delta]
205	mul dword ptr [u32NanoTSFactor0]
206	div dword ptr [u32UpdateIntervalTSC]
207	mov dword ptr [u64Delta], eax
208	xor edx, edx
209	mov dword ptr [u64Delta + 4], edx
210	}
211	#endif
212
213	/*
214	* Calculate the time and compare it with the previously returned value.
215	*
216	* Since this function is called very frequently when the VM is running
217	* and then mostly on EMT, we can restrict the valid range of the delta
218	* (-1s to 2*GipUpdates) and simplify/optimize the default path.
219	*/
220	u64NanoTS += u64Delta;
221	uint64_t u64DeltaPrev = u64NanoTS - u64PrevNanoTS;
222	if (RT_LIKELY(u64DeltaPrev < 1000000000 /* 1s */))
223	/* frequent - less than 1s since last call. */;
224	else if ( (int64_t)u64DeltaPrev < 0
225	&& (int64_t)u64DeltaPrev + u32NanoTSFactor0 * 2 > 0)
226	{
227	/* occasional - u64NanoTS is in the 'past' relative to previous returns. */
228	ASMAtomicIncU32(&pVM->tm.s.CTX_SUFF(VirtualGetRawData).c1nsSteps);
229	u64NanoTS = u64PrevNanoTS + 1;
230	#ifndef IN_RING3
231	VM_FF_SET(pVM, VM_FF_TO_R3); /* S10 hack */
232	#endif
233	}
234	else if (u64PrevNanoTS)
235	{
236	/* Something has gone bust, if negative offset it's real bad. */
237	ASMAtomicIncU32(&pVM->tm.s.CTX_SUFF(VirtualGetRawData).cBadPrev);
238	if ((int64_t)u64DeltaPrev < 0)
239	LogRel(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64 u64Delta=%#RX64\n",
240	u64DeltaPrev, u64PrevNanoTS, u64NanoTS, u64Delta));
241	else
242	Log(("TM: u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64 u64Delta=%#RX64 (debugging?)\n",
243	u64DeltaPrev, u64PrevNanoTS, u64NanoTS, u64Delta));
244	#ifdef DEBUG_bird
245	/** @todo there are some hickups during boot and reset that can cause 2-5 seconds delays. Investigate... */
246	AssertMsg(u64PrevNanoTS > UINT64_C(100000000000) /* 100s */,
247	("u64DeltaPrev=%RI64 u64PrevNanoTS=0x%016RX64 u64NanoTS=0x%016RX64 u64Delta=%#RX64\n",
248	u64DeltaPrev, u64PrevNanoTS, u64NanoTS, u64Delta));
249	#endif
250	}
251	/* else: We're resuming (see TMVirtualResume). */
252	if (RT_LIKELY(ASMAtomicCmpXchgU64(&pVM->tm.s.u64VirtualRawPrev, u64NanoTS, u64PrevNanoTS)))
253	return u64NanoTS;
254
255	/*
256	* Attempt updating the previous value, provided we're still ahead of it.
257	*
258	* There is no point in recalculating u64NanoTS because we got preemted or if
259	* we raced somebody while the GIP was updated, since these are events
260	* that might occure at any point in the return path as well.
261	*/
262	for (int cTries = 50;;)
263	{
264	u64PrevNanoTS = ASMAtomicReadU64(&pVM->tm.s.u64VirtualRawPrev);
265	if (u64PrevNanoTS >= u64NanoTS)
266	break;
267	if (ASMAtomicCmpXchgU64(&pVM->tm.s.u64VirtualRawPrev, u64NanoTS, u64PrevNanoTS))
268	break;
269	AssertBreak(--cTries <= 0);
270	if (cTries < 25 && !VM_IS_EMT(pVM)) /* give up early */
271	break;
272	}
273
274	return u64NanoTS;
275	}
276
277	#endif
278
279
280	/**
281	* Get the time when we're not running at 100%
282	*
283	* @returns The timestamp.
284	* @param pVM The VM handle.
285	*/
286	static uint64_t tmVirtualGetRawNonNormal(PVM pVM)
287	{
288	/*
289	* Recalculate the RTTimeNanoTS() value for the period where
290	* warp drive has been enabled.
291	*/
292	uint64_t u64 = tmVirtualGetRawNanoTS(pVM);
293	u64 -= pVM->tm.s.u64VirtualWarpDriveStart;
294	u64 *= pVM->tm.s.u32VirtualWarpDrivePercentage;
295	u64 /= 100;
296	u64 += pVM->tm.s.u64VirtualWarpDriveStart;
297
298	/*
299	* Now we apply the virtual time offset.
300	* (Which is the negated tmVirtualGetRawNanoTS() value for when the virtual
301	* machine started if it had been running continuously without any suspends.)
302	*/
303	u64 -= pVM->tm.s.u64VirtualOffset;
304	return u64;
305	}
306
307
308	/**
309	* Get the raw virtual time.
310	*
311	* @returns The current time stamp.
312	* @param pVM The VM handle.
313	*/
314	DECLINLINE(uint64_t) tmVirtualGetRaw(PVM pVM)
315	{
316	if (RT_LIKELY(!pVM->tm.s.fVirtualWarpDrive))
317	return tmVirtualGetRawNanoTS(pVM) - pVM->tm.s.u64VirtualOffset;
318	return tmVirtualGetRawNonNormal(pVM);
319	}
320
321
322	/**
323	* Inlined version of tmVirtualGetEx.
324	*/
325	DECLINLINE(uint64_t) tmVirtualGet(PVM pVM, bool fCheckTimers)
326	{
327	uint64_t u64;
328	if (RT_LIKELY(pVM->tm.s.fVirtualTicking))
329	{
330	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualGet);
331	u64 = tmVirtualGetRaw(pVM);
332
333	/*
334	* Use the chance to check for expired timers.
335	*/
336	if ( fCheckTimers
337	&& !VM_FF_ISSET(pVM, VM_FF_TIMER)
338	&& ( pVM->tm.s.CTX_SUFF(paTimerQueues)[TMCLOCK_VIRTUAL].u64Expire <= u64
339	\|\| ( pVM->tm.s.fVirtualSyncTicking
340	&& pVM->tm.s.CTX_SUFF(paTimerQueues)[TMCLOCK_VIRTUAL_SYNC].u64Expire <= u64 - pVM->tm.s.offVirtualSync
341	)
342	)
343	)
344	{
345	VM_FF_SET(pVM, VM_FF_TIMER);
346	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualGetSetFF);
347	#ifdef IN_RING3
348	REMR3NotifyTimerPending(pVM);
349	VMR3NotifyFF(pVM, true);
350	#endif
351	}
352	}
353	else
354	u64 = pVM->tm.s.u64Virtual;
355	return u64;
356	}
357
358
359	/**
360	* Gets the current TMCLOCK_VIRTUAL time
361	*
362	* @returns The timestamp.
363	* @param pVM VM handle.
364	*
365	* @remark While the flow of time will never go backwards, the speed of the
366	* progress varies due to inaccurate RTTimeNanoTS and TSC. The latter can be
367	* influenced by power saving (SpeedStep, PowerNow!), while the former
368	* makes use of TSC and kernel timers.
369	*/
370	VMMDECL(uint64_t) TMVirtualGet(PVM pVM)
371	{
372	return TMVirtualGetEx(pVM, true /* check timers */);
373	}
374
375
376	/**
377	* Gets the current TMCLOCK_VIRTUAL time
378	*
379	* @returns The timestamp.
380	* @param pVM VM handle.
381	* @param fCheckTimers Check timers or not
382	*
383	* @remark While the flow of time will never go backwards, the speed of the
384	* progress varies due to inaccurate RTTimeNanoTS and TSC. The latter can be
385	* influenced by power saving (SpeedStep, PowerNow!), while the former
386	* makes use of TSC and kernel timers.
387	*/
388	VMMDECL(uint64_t) TMVirtualGetEx(PVM pVM, bool fCheckTimers)
389	{
390	return tmVirtualGet(pVM, fCheckTimers);
391	}
392
393
394	/**
395	* Gets the current TMCLOCK_VIRTUAL_SYNC time.
396	*
397	* @returns The timestamp.
398	* @param pVM VM handle.
399	* @param fCheckTimers Check timers or not
400	* @thread EMT.
401	*/
402	VMMDECL(uint64_t) TMVirtualSyncGetEx(PVM pVM, bool fCheckTimers)
403	{
404	VM_ASSERT_EMT(pVM);
405
406	uint64_t u64;
407	if (pVM->tm.s.fVirtualSyncTicking)
408	{
409	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualGetSync);
410
411	/*
412	* Query the virtual clock and do the usual expired timer check.
413	*/
414	Assert(pVM->tm.s.fVirtualTicking);
415	u64 = tmVirtualGetRaw(pVM);
416	if ( fCheckTimers
417	&& !VM_FF_ISSET(pVM, VM_FF_TIMER)
418	&& pVM->tm.s.CTX_SUFF(paTimerQueues)[TMCLOCK_VIRTUAL].u64Expire <= u64)
419	{
420	VM_FF_SET(pVM, VM_FF_TIMER);
421	#ifdef IN_RING3
422	REMR3NotifyTimerPending(pVM);
423	VMR3NotifyFF(pVM, true);
424	#endif
425	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualGetSyncSetFF);
426	}
427
428	/*
429	* Read the offset and adjust if we're playing catch-up.
430	*
431	* The catch-up adjusting work by us decrementing the offset by a percentage of
432	* the time elapsed since the previous TMVirtualGetSync call.
433	*
434	* It's possible to get a very long or even negative interval between two read
435	* for the following reasons:
436	* - Someone might have suspended the process execution, frequently the case when
437	* debugging the process.
438	* - We might be on a different CPU which TSC isn't quite in sync with the
439	* other CPUs in the system.
440	* - Another thread is racing us and we might have been preemnted while inside
441	* this function.
442	*
443	* Assuming nano second virtual time, we can simply ignore any intervals which has
444	* any of the upper 32 bits set.
445	*/
446	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
447	uint64_t off = pVM->tm.s.offVirtualSync;
448	if (pVM->tm.s.fVirtualSyncCatchUp)
449	{
450	const uint64_t u64Prev = pVM->tm.s.u64VirtualSyncCatchUpPrev;
451	uint64_t u64Delta = u64 - u64Prev;
452	if (RT_LIKELY(!(u64Delta >> 32)))
453	{
454	uint64_t u64Sub = ASMMultU64ByU32DivByU32(u64Delta, pVM->tm.s.u32VirtualSyncCatchUpPercentage, 100);
455	if (off > u64Sub + pVM->tm.s.offVirtualSyncGivenUp)
456	{
457	off -= u64Sub;
458	ASMAtomicXchgU64(&pVM->tm.s.offVirtualSync, off);
459	pVM->tm.s.u64VirtualSyncCatchUpPrev = u64;
460	Log4(("TM: %RU64/%RU64: sub %RU32\n", u64 - off, pVM->tm.s.offVirtualSync - pVM->tm.s.offVirtualSyncGivenUp, u64Sub));
461	}
462	else
463	{
464	/* we've completely caught up. */
465	STAM_PROFILE_ADV_STOP(&pVM->tm.s.StatVirtualSyncCatchup, c);
466	off = pVM->tm.s.offVirtualSyncGivenUp;
467	ASMAtomicXchgU64(&pVM->tm.s.offVirtualSync, off);
468	ASMAtomicXchgBool(&pVM->tm.s.fVirtualSyncCatchUp, false);
469	pVM->tm.s.u64VirtualSyncCatchUpPrev = u64;
470	Log4(("TM: %RU64/0: caught up\n", u64));
471	}
472	}
473	else
474	{
475	/* More than 4 seconds since last time (or negative), ignore it. */
476	if (!(u64Delta & RT_BIT_64(63)))
477	pVM->tm.s.u64VirtualSyncCatchUpPrev = u64;
478	Log(("TMVirtualGetSync: u64Delta=%RX64\n", u64Delta));
479	}
480	}
481
482	/*
483	* Complete the calculation of the current TMCLOCK_VIRTUAL_SYNC time. The current
484	* approach is to never pass the head timer. So, when we do stop the clock and
485	* set the timer pending flag.
486	*/
487	u64 -= off;
488	const uint64_t u64Expire = pVM->tm.s.CTX_SUFF(paTimerQueues)[TMCLOCK_VIRTUAL_SYNC].u64Expire;
489	if (u64 >= u64Expire)
490	{
491	u64 = u64Expire;
492	ASMAtomicXchgU64(&pVM->tm.s.u64VirtualSync, u64);
493	ASMAtomicXchgBool(&pVM->tm.s.fVirtualSyncTicking, false);
494	if ( fCheckTimers
495	&& !VM_FF_ISSET(pVM, VM_FF_TIMER))
496	{
497	VM_FF_SET(pVM, VM_FF_TIMER);
498	#ifdef IN_RING3
499	REMR3NotifyTimerPending(pVM);
500	VMR3NotifyFF(pVM, true);
501	#endif
502	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualGetSyncSetFF);
503	Log4(("TM: %RU64/%RU64: exp tmr=>ff\n", u64, pVM->tm.s.offVirtualSync - pVM->tm.s.offVirtualSyncGivenUp));
504	}
505	else
506	Log4(("TM: %RU64/%RU64: exp tmr\n", u64, pVM->tm.s.offVirtualSync - pVM->tm.s.offVirtualSyncGivenUp));
507	}
508	}
509	else
510	{
511	u64 = pVM->tm.s.u64VirtualSync;
512
513	/*
514	* If it looks like a halt caused by pending timers, make sure the FF is raised.
515	* This is a safeguard against timer queue runner leaving the virtual sync clock stopped.
516	*/
517	if ( fCheckTimers
518	&& pVM->tm.s.fVirtualTicking
519	&& !VM_FF_ISSET(pVM, VM_FF_TIMER))
520	{
521	const uint64_t u64Expire = pVM->tm.s.CTX_SUFF(paTimerQueues)[TMCLOCK_VIRTUAL_SYNC].u64Expire;
522	if (u64 >= u64Expire)
523	{
524	VM_FF_SET(pVM, VM_FF_TIMER);
525	#ifdef IN_RING3
526	REMR3NotifyTimerPending(pVM);
527	VMR3NotifyFF(pVM, true);
528	#endif
529	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualGetSyncSetFF);
530	Log4(("TM: %RU64/%RU64: exp tmr=>ff (!)\n", u64, pVM->tm.s.offVirtualSync - pVM->tm.s.offVirtualSyncGivenUp));
531	}
532	}
533	}
534	return u64;
535	}
536
537
538	/**
539	* Gets the current TMCLOCK_VIRTUAL_SYNC time.
540	*
541	* @returns The timestamp.
542	* @param pVM VM handle.
543	* @thread EMT.
544	*/
545	VMMDECL(uint64_t) TMVirtualSyncGet(PVM pVM)
546	{
547	return TMVirtualSyncGetEx(pVM, true /* check timers */);
548	}
549
550
551	/**
552	* Gets the current lag of the synchronous virtual clock (relative to the virtual clock).
553	*
554	* @return The current lag.
555	* @param pVM VM handle.
556	*/
557	VMMDECL(uint64_t) TMVirtualSyncGetLag(PVM pVM)
558	{
559	return pVM->tm.s.offVirtualSync - pVM->tm.s.offVirtualSyncGivenUp;
560	}
561
562
563	/**
564	* Get the current catch-up percent.
565	*
566	* @return The current catch0up percent. 0 means running at the same speed as the virtual clock.
567	* @param pVM VM handle.
568	*/
569	VMMDECL(uint32_t) TMVirtualSyncGetCatchUpPct(PVM pVM)
570	{
571	if (pVM->tm.s.fVirtualSyncCatchUp)
572	return pVM->tm.s.u32VirtualSyncCatchUpPercentage;
573	return 0;
574	}
575
576
577	/**
578	* Gets the current TMCLOCK_VIRTUAL frequency.
579	*
580	* @returns The freqency.
581	* @param pVM VM handle.
582	*/
583	VMMDECL(uint64_t) TMVirtualGetFreq(PVM pVM)
584	{
585	return TMCLOCK_FREQ_VIRTUAL;
586	}
587
588
589	/**
590	* Resumes the virtual clock.
591	*
592	* @returns VINF_SUCCESS on success.
593	* @returns VINF_INTERNAL_ERROR and VBOX_STRICT assertion if called out of order.
594	* @param pVM VM handle.
595	*/
596	VMMDECL(int) TMVirtualResume(PVM pVM)
597	{
598	if (!pVM->tm.s.fVirtualTicking)
599	{
600	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualResume);
601	pVM->tm.s.u64VirtualRawPrev = 0;
602	pVM->tm.s.u64VirtualWarpDriveStart = tmVirtualGetRawNanoTS(pVM);
603	pVM->tm.s.u64VirtualOffset = pVM->tm.s.u64VirtualWarpDriveStart - pVM->tm.s.u64Virtual;
604	pVM->tm.s.fVirtualTicking = true;
605	pVM->tm.s.fVirtualSyncTicking = true;
606	return VINF_SUCCESS;
607	}
608
609	AssertFailed();
610	return VERR_INTERNAL_ERROR;
611	}
612
613
614	/**
615	* Pauses the virtual clock.
616	*
617	* @returns VINF_SUCCESS on success.
618	* @returns VINF_INTERNAL_ERROR and VBOX_STRICT assertion if called out of order.
619	* @param pVM VM handle.
620	*/
621	VMMDECL(int) TMVirtualPause(PVM pVM)
622	{
623	if (pVM->tm.s.fVirtualTicking)
624	{
625	STAM_COUNTER_INC(&pVM->tm.s.StatVirtualPause);
626	pVM->tm.s.u64Virtual = tmVirtualGetRaw(pVM);
627	pVM->tm.s.fVirtualSyncTicking = false;
628	pVM->tm.s.fVirtualTicking = false;
629	return VINF_SUCCESS;
630	}
631
632	AssertFailed();
633	return VERR_INTERNAL_ERROR;
634	}
635
636
637	/**
638	* Gets the current warp drive percent.
639	*
640	* @returns The warp drive percent.
641	* @param pVM The VM handle.
642	*/
643	VMMDECL(uint32_t) TMVirtualGetWarpDrive(PVM pVM)
644	{
645	return pVM->tm.s.u32VirtualWarpDrivePercentage;
646	}
647
648
649	/**
650	* Sets the warp drive percent of the virtual time.
651	*
652	* @returns VBox status code.
653	* @param pVM The VM handle.
654	* @param u32Percent The new percentage. 100 means normal operation.
655	*/
656	VMMDECL(int) TMVirtualSetWarpDrive(PVM pVM, uint32_t u32Percent)
657	{
658	/** @todo This isn't a feature specific to virtual time, move to TM level. (It
659	* should affect the TMR3UCTNow as well! */
660	#ifdef IN_RING3
661	PVMREQ pReq;
662	int rc = VMR3ReqCall(pVM, VMREQDEST_ANY, &pReq, RT_INDEFINITE_WAIT, (PFNRT)tmVirtualSetWarpDrive, 2, pVM, u32Percent);
663	if (RT_SUCCESS(rc))
664	rc = pReq->iStatus;
665	VMR3ReqFree(pReq);
666	return rc;
667	#else
668
669	return tmVirtualSetWarpDrive(pVM, u32Percent);
670	#endif
671	}
672
673
674	/**
675	* EMT worker for tmVirtualSetWarpDrive.
676	*
677	* @returns VBox status code.
678	* @param pVM The VM handle.
679	* @param u32Percent See TMVirtualSetWarpDrive().
680	* @internal
681	*/
682	static DECLCALLBACK(int) tmVirtualSetWarpDrive(PVM pVM, uint32_t u32Percent)
683	{
684	/*
685	* Validate it.
686	*/
687	AssertMsgReturn(u32Percent >= 2 && u32Percent <= 20000,
688	("%RX32 is not between 2 and 20000 (inclusive).\n", u32Percent),
689	VERR_INVALID_PARAMETER);
690
691	/*
692	* If the time is running we'll have to pause it before we can change
693	* the warp drive settings.
694	*/
695	bool fPaused = pVM->tm.s.fVirtualTicking;
696	if (fPaused)
697	{
698	int rc = TMVirtualPause(pVM);
699	AssertRCReturn(rc, rc);
700	rc = TMCpuTickPause(pVM);
701	AssertRCReturn(rc, rc);
702	}
703
704	pVM->tm.s.u32VirtualWarpDrivePercentage = u32Percent;
705	pVM->tm.s.fVirtualWarpDrive = u32Percent != 100;
706	LogRel(("TM: u32VirtualWarpDrivePercentage=%RI32 fVirtualWarpDrive=%RTbool\n",
707	pVM->tm.s.u32VirtualWarpDrivePercentage, pVM->tm.s.fVirtualWarpDrive));
708
709	if (fPaused)
710	{
711	int rc = TMVirtualResume(pVM);
712	AssertRCReturn(rc, rc);
713	rc = TMCpuTickResume(pVM);
714	AssertRCReturn(rc, rc);
715	}
716
717	return VINF_SUCCESS;
718	}
719
720
721	/**
722	* Converts from virtual ticks to nanoseconds.
723	*
724	* @returns nanoseconds.
725	* @param pVM The VM handle.
726	* @param u64VirtualTicks The virtual ticks to convert.
727	* @remark There could be rounding errors here. We just do a simple integere divide
728	* without any adjustments.
729	*/
730	VMMDECL(uint64_t) TMVirtualToNano(PVM pVM, uint64_t u64VirtualTicks)
731	{
732	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
733	return u64VirtualTicks;
734	}
735
736
737	/**
738	* Converts from virtual ticks to microseconds.
739	*
740	* @returns microseconds.
741	* @param pVM The VM handle.
742	* @param u64VirtualTicks The virtual ticks to convert.
743	* @remark There could be rounding errors here. We just do a simple integere divide
744	* without any adjustments.
745	*/
746	VMMDECL(uint64_t) TMVirtualToMicro(PVM pVM, uint64_t u64VirtualTicks)
747	{
748	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
749	return u64VirtualTicks / 1000;
750	}
751
752
753	/**
754	* Converts from virtual ticks to milliseconds.
755	*
756	* @returns milliseconds.
757	* @param pVM The VM handle.
758	* @param u64VirtualTicks The virtual ticks to convert.
759	* @remark There could be rounding errors here. We just do a simple integere divide
760	* without any adjustments.
761	*/
762	VMMDECL(uint64_t) TMVirtualToMilli(PVM pVM, uint64_t u64VirtualTicks)
763	{
764	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
765	return u64VirtualTicks / 1000000;
766	}
767
768
769	/**
770	* Converts from nanoseconds to virtual ticks.
771	*
772	* @returns virtual ticks.
773	* @param pVM The VM handle.
774	* @param u64NanoTS The nanosecond value ticks to convert.
775	* @remark There could be rounding and overflow errors here.
776	*/
777	VMMDECL(uint64_t) TMVirtualFromNano(PVM pVM, uint64_t u64NanoTS)
778	{
779	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
780	return u64NanoTS;
781	}
782
783
784	/**
785	* Converts from microseconds to virtual ticks.
786	*
787	* @returns virtual ticks.
788	* @param pVM The VM handle.
789	* @param u64MicroTS The microsecond value ticks to convert.
790	* @remark There could be rounding and overflow errors here.
791	*/
792	VMMDECL(uint64_t) TMVirtualFromMicro(PVM pVM, uint64_t u64MicroTS)
793	{
794	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
795	return u64MicroTS * 1000;
796	}
797
798
799	/**
800	* Converts from milliseconds to virtual ticks.
801	*
802	* @returns virtual ticks.
803	* @param pVM The VM handle.
804	* @param u64MilliTS The millisecond value ticks to convert.
805	* @remark There could be rounding and overflow errors here.
806	*/
807	VMMDECL(uint64_t) TMVirtualFromMilli(PVM pVM, uint64_t u64MilliTS)
808	{
809	AssertCompile(TMCLOCK_FREQ_VIRTUAL == 1000000000);
810	return u64MilliTS * 1000000;
811	}
812

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source: vbox/trunk/src/VBox/VMM/VMMAll/TMAllVirtual.cpp@ 17659

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