VMEmt.cpp@ 3460

Last change on this file since 3460 was 3273, checked in by vboxsync, 17 years ago
Switch to the new halt method. potentially risky.
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File size: 25.2 KB

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1	/* $Id: VMEmt.cpp 3273 2007-06-25 11:45:29Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* If you received this file as part of a commercial VirtualBox
18	* distribution, then only the terms of your commercial VirtualBox
19	* license agreement apply instead of the previous paragraph.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_VM
27	#include <VBox/tm.h>
28	#include <VBox/dbgf.h>
29	#include <VBox/em.h>
30	#include <VBox/pdm.h>
31	#include <VBox/rem.h>
32	#include "VMInternal.h"
33	#include <VBox/vm.h>
34
35	#include <VBox/err.h>
36	#include <VBox/log.h>
37	#include <iprt/assert.h>
38	#include <iprt/asm.h>
39	#include <iprt/semaphore.h>
40	#include <iprt/string.h>
41	#include <iprt/thread.h>
42	#include <iprt/time.h>
43
44
45
46
47	/**
48	* The emulation thread.
49	*
50	* @returns Thread exit code.
51	* @param ThreadSelf The handle to the executing thread.
52	* @param pvArgs Pointer to a VMEMULATIONTHREADARGS structure.
53	*/
54	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
55	{
56	PVMEMULATIONTHREADARGS pArgs = (PVMEMULATIONTHREADARGS)pvArgs;
57	AssertReleaseMsg(pArgs && pArgs->pVM, ("Invalid arguments to the emulation thread!\n"));
58
59	/*
60	* Init the native thread member.
61	*/
62	PVM pVM = pArgs->pVM;
63	pVM->NativeThreadEMT = RTThreadGetNative(ThreadSelf);
64
65	/*
66	* The request loop.
67	*/
68	VMSTATE enmBefore;
69	int rc;
70	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pVM=%p\n", ThreadSelf, pVM));
71	for (;;)
72	{
73	/* Requested to exit the EMT thread out of sync? (currently only VMR3WaitForResume) */
74	if (setjmp(pVM->vm.s.emtJumpEnv) != 0)
75	{
76	rc = VINF_SUCCESS;
77	break;
78	}
79
80	/*
81	* Pending requests which needs servicing?
82	*
83	* We check for state changes in addition to status codes when
84	* servicing requests. (Look after the ifs.)
85	*/
86	enmBefore = pVM->enmVMState;
87	if (VM_FF_ISSET(pVM, VM_FF_TERMINATE))
88	{
89	rc = VINF_EM_TERMINATE;
90	break;
91	}
92	else if (pVM->vm.s.pReqs)
93	{
94	/*
95	* Service execute in EMT request.
96	*/
97	rc = VMR3ReqProcess(pVM);
98	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
99	}
100	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
101	{
102	/*
103	* Service the debugger request.
104	*/
105	rc = DBGFR3VMMForcedAction(pVM);
106	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
107	}
108	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
109	{
110	/*
111	* Service a delay reset request.
112	*/
113	rc = VMR3Reset(pVM);
114	VM_FF_CLEAR(pVM, VM_FF_RESET);
115	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
116	}
117	else
118	{
119	/*
120	* Nothing important is pending, so wait for something.
121	*/
122	rc = VMR3Wait(pVM);
123	if (VBOX_FAILURE(rc))
124	break;
125	}
126
127	/*
128	* Check for termination requests, these are extremely high priority.
129	*/
130	if ( rc == VINF_EM_TERMINATE
131	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE))
132	break;
133
134	/*
135	* Some requests (both VMR3Req* and the DBGF) can potentially
136	* resume or start the VM, in that case we'll get a change in
137	* VM status indicating that we're now running.
138	*/
139	if ( VBOX_SUCCESS(rc)
140	&& enmBefore != pVM->enmVMState
141	&& (pVM->enmVMState == VMSTATE_RUNNING))
142	{
143	rc = EMR3ExecuteVM(pVM);
144	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Vrc, enmVMState=%d\n", rc, pVM->enmVMState));
145	}
146
147	} /* forever */
148
149
150	/*
151	* Exiting.
152	*/
153	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pVM=%p rc=%Vrc enmBefore=%d enmVMState=%d\n",
154	ThreadSelf, pVM, rc, enmBefore, pVM->enmVMState));
155	if (pVM->vm.s.fEMTDoesTheCleanup)
156	{
157	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
158	vmR3Destroy(pVM);
159	vmR3DestroyFinalBit(pVM);
160	Log(("vmR3EmulationThread: EMT is terminated.\n"));
161	}
162	else
163	{
164	/* we don't reset ThreadEMT here because it's used in waiting. */
165	pVM->NativeThreadEMT = NIL_RTNATIVETHREAD;
166	}
167	return rc;
168	}
169
170
171	/**
172	* Wait for VM to be resumed. Handle events like vmR3EmulationThread does.
173	* In case the VM is stopped, clean up and long jump to the main EMT loop.
174	*
175	* @returns VINF_SUCCESS or doesn't return
176	* @param pVM VM handle.
177	*/
178	VMR3DECL(int) VMR3WaitForResume(PVM pVM)
179	{
180	/*
181	* The request loop.
182	*/
183	VMSTATE enmBefore;
184	int rc;
185	for (;;)
186	{
187
188	/*
189	* Pending requests which needs servicing?
190	*
191	* We check for state changes in addition to status codes when
192	* servicing requests. (Look after the ifs.)
193	*/
194	enmBefore = pVM->enmVMState;
195	if (VM_FF_ISSET(pVM, VM_FF_TERMINATE))
196	{
197	rc = VINF_EM_TERMINATE;
198	break;
199	}
200	else if (pVM->vm.s.pReqs)
201	{
202	/*
203	* Service execute in EMT request.
204	*/
205	rc = VMR3ReqProcess(pVM);
206	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
207	}
208	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
209	{
210	/*
211	* Service the debugger request.
212	*/
213	rc = DBGFR3VMMForcedAction(pVM);
214	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
215	}
216	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
217	{
218	/*
219	* Service a delay reset request.
220	*/
221	rc = VMR3Reset(pVM);
222	VM_FF_CLEAR(pVM, VM_FF_RESET);
223	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
224	}
225	else
226	{
227	/*
228	* Nothing important is pending, so wait for something.
229	*/
230	rc = VMR3Wait(pVM);
231	if (VBOX_FAILURE(rc))
232	break;
233	}
234
235	/*
236	* Check for termination requests, these are extremely high priority.
237	*/
238	if ( rc == VINF_EM_TERMINATE
239	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE))
240	break;
241
242	/*
243	* Some requests (both VMR3Req* and the DBGF) can potentially
244	* resume or start the VM, in that case we'll get a change in
245	* VM status indicating that we're now running.
246	*/
247	if ( VBOX_SUCCESS(rc)
248	&& enmBefore != pVM->enmVMState
249	&& (pVM->enmVMState == VMSTATE_RUNNING))
250	{
251	/* Only valid exit reason. */
252	return VINF_SUCCESS;
253	}
254
255	} /* forever */
256
257	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
258	longjmp(pVM->vm.s.emtJumpEnv, 1);
259	}
260
261
262	/**
263	* The old halt loop.
264	*/
265	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PVM pVM, const uint32_t fMask, uint64_t /* u64Now*/)
266	{
267	/*
268	* Halt loop.
269	*/
270	int rc = VINF_SUCCESS;
271	ASMAtomicXchgU32(&pVM->vm.s.fWait, 1);
272	//unsigned cLoops = 0;
273	for (;;)
274	{
275	/*
276	* Work the timers and check if we can exit.
277	* The poll call gives us the ticks left to the next event in
278	* addition to perhaps set an FF.
279	*/
280	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltPoll, a);
281	PDMR3Poll(pVM);
282	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltPoll, a);
283	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltTimers, b);
284	TMR3TimerQueuesDo(pVM);
285	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltTimers, b);
286	if (VM_FF_ISPENDING(pVM, fMask))
287	break;
288	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
289	if (VM_FF_ISPENDING(pVM, fMask))
290	break;
291
292	/*
293	* Wait for a while. Someone will wake us up or interrupt the call if
294	* anything needs our attention.
295	*/
296	if (u64NanoTS < 50000)
297	{
298	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
299	/* spin */;
300	}
301	else
302	{
303	VMMR3YieldStop(pVM);
304	//uint64_t u64Start = RTTimeNanoTS();
305	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
306	{
307	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
308	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltYield, a);
309	RTThreadYield(); /* this is the best we can do here */
310	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltYield, a);
311	}
312	else if (u64NanoTS < 2000000)
313	{
314	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
315	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltBlock, a);
316	rc = RTSemEventWait(pVM->vm.s.EventSemWait, 1);
317	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltBlock, a);
318	}
319	else
320	{
321	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
322	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltBlock, a);
323	rc = RTSemEventWait(pVM->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
324	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltBlock, a);
325	}
326	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
327	//RTLogPrintf(" -> rc=%Vrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
328	}
329	if (rc == VERR_TIMEOUT)
330	rc = VINF_SUCCESS;
331	else if (VBOX_FAILURE(rc))
332	{
333	AssertRC(rc != VERR_INTERRUPTED);
334	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
335	VM_FF_SET(pVM, VM_FF_TERMINATE);
336	rc = VERR_INTERNAL_ERROR;
337	break;
338	}
339	}
340
341	return rc;
342	}
343
344
345	/**
346	* Initialize the configuration of halt method 1 & 2.
347	*
348	* @return VBox status code. Failure on invalid CFGM data.
349	* @param pVM The VM handle.
350	*/
351	static int vmR3HaltMethod12ReadConfig(PVM pVM)
352	{
353	/*
354	* The defaults.
355	*/
356	pVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
357	pVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
358	pVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
359	pVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
360	pVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
361
362	/*
363	* Query overrides.
364	*/
365	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pVM), "/VMM/HaltedMethod1");
366	if (pCfg)
367	{
368
369	}
370
371	return VINF_SUCCESS;
372	}
373
374
375	/**
376	* Initialize halt method 1.
377	*
378	* @return VBox status code.
379	* @param pVM The VM handle.
380	*/
381	static DECLCALLBACK(int) vmR3HaltMethod1Init(PVM pVM)
382	{
383	return vmR3HaltMethod12ReadConfig(pVM);
384	}
385
386
387	/**
388	* Method 1 - Block whenever possible, and when lagging behind
389	* switch to spinning for 10-30ms with occational blocking until
390	* the lag has been eliminated.
391	*/
392	static DECLCALLBACK(int) vmR3HaltMethod1DoHalt(PVM pVM, const uint32_t fMask, uint64_t u64Now)
393	{
394	/*
395	* To simplify things, we decide up-front whether we should switch to spinning or
396	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
397	* and that it will generate interrupts or other events that will cause us to exit
398	* the halt loop.
399	*/
400	bool fBlockOnce = false;
401	bool fSpinning = false;
402	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
403	if (u32CatchUpPct /* non-zero if catching up */)
404	{
405	if (pVM->vm.s.Halt.Method12.u64StartSpinTS)
406	{
407	fSpinning = TMVirtualSyncGetLag(pVM) >= pVM->vm.s.Halt.Method12.u32StopSpinningCfg;
408	if (fSpinning)
409	{
410	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
411	fBlockOnce = u64Now - pVM->vm.s.Halt.Method12.u64LastBlockTS
412	> RT_MAX(pVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
413	RT_MIN(u64Lag / pVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
414	pVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
415	}
416	else
417	{
418	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
419	pVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
420	}
421	}
422	else
423	{
424	fSpinning = TMVirtualSyncGetLag(pVM) >= pVM->vm.s.Halt.Method12.u32StartSpinningCfg;
425	if (fSpinning)
426	pVM->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
427	}
428	}
429	else if (pVM->vm.s.Halt.Method12.u64StartSpinTS)
430	{
431	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
432	pVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
433	}
434
435	/*
436	* Halt loop.
437	*/
438	int rc = VINF_SUCCESS;
439	ASMAtomicXchgU32(&pVM->vm.s.fWait, 1);
440	unsigned cLoops = 0;
441	for (;; cLoops++)
442	{
443	/*
444	* Work the timers and check if we can exit.
445	*/
446	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltPoll, a);
447	PDMR3Poll(pVM);
448	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltPoll, a);
449	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltTimers, b);
450	TMR3TimerQueuesDo(pVM);
451	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltTimers, b);
452	if (VM_FF_ISPENDING(pVM, fMask))
453	break;
454
455	/*
456	* Estimate time left to the next event.
457	*/
458	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
459	if (VM_FF_ISPENDING(pVM, fMask))
460	break;
461
462	/*
463	* Block if we're not spinning and the interval isn't all that small.
464	*/
465	if ( ( !fSpinning
466	\|\| fBlockOnce)
467	&& u64NanoTS >= 250000) /* 0.250 ms */
468	{
469	const uint64_t Start = pVM->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
470	VMMR3YieldStop(pVM);
471
472	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
473	if (cMilliSecs <= pVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
474	cMilliSecs = 1;
475	else
476	cMilliSecs -= pVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
477	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
478	STAM_REL_PROFILE_START(&pVM->vm.s.StatHaltBlock, a);
479	rc = RTSemEventWait(pVM->vm.s.EventSemWait, cMilliSecs);
480	STAM_REL_PROFILE_STOP(&pVM->vm.s.StatHaltBlock, a);
481	if (rc == VERR_TIMEOUT)
482	rc = VINF_SUCCESS;
483	else if (VBOX_FAILURE(rc))
484	{
485	AssertRC(rc != VERR_INTERRUPTED);
486	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
487	VM_FF_SET(pVM, VM_FF_TERMINATE);
488	rc = VERR_INTERNAL_ERROR;
489	break;
490	}
491
492	/*
493	* Calc the statistics.
494	* Update averages every 16th time, and flush parts of the history every 64th time.
495	*/
496	const uint64_t Elapsed = RTTimeNanoTS() - Start;
497	pVM->vm.s.Halt.Method12.cNSBlocked += Elapsed;
498	if (Elapsed > u64NanoTS)
499	pVM->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
500	pVM->vm.s.Halt.Method12.cBlocks++;
501	if (!(pVM->vm.s.Halt.Method12.cBlocks & 0xf))
502	{
503	pVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pVM->vm.s.Halt.Method12.cNSBlockedTooLong / pVM->vm.s.Halt.Method12.cBlocks;
504	if (!(pVM->vm.s.Halt.Method12.cBlocks & 0x3f))
505	{
506	pVM->vm.s.Halt.Method12.cNSBlockedTooLong = pVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
507	pVM->vm.s.Halt.Method12.cBlocks = 0x40;
508	}
509	}
510	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
511
512	/*
513	* Clear the block once flag if we actually blocked.
514	*/
515	if ( fBlockOnce
516	&& Elapsed > 100000 /* 0.1 ms */)
517	fBlockOnce = false;
518	}
519	}
520	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
521
522	return rc;
523	}
524
525
526	/**
527	* Default VMR3Wait() worker.
528	*
529	* @returns VBox status code.
530	* @param pVM The VM handle.
531	*/
532	static DECLCALLBACK(int) vmR3DefaultWait(PVM pVM)
533	{
534	int rc = VINF_SUCCESS;
535	ASMAtomicXchgU32(&pVM->vm.s.fWait, 1);
536	for (;;)
537	{
538	/*
539	* Check Relevant FFs.
540	*/
541	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
542	break;
543
544	/*
545	* Wait for a while. Someone will wake us up or interrupt the call if
546	* anything needs our attention.
547	*/
548	rc = RTSemEventWait(pVM->vm.s.EventSemWait, 1000);
549	if (rc == VERR_TIMEOUT)
550	rc = VINF_SUCCESS;
551	else if (VBOX_FAILURE(rc))
552	{
553	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
554	VM_FF_SET(pVM, VM_FF_TERMINATE);
555	rc = VERR_INTERNAL_ERROR;
556	break;
557	}
558
559	}
560	ASMAtomicXchgU32(&pVM->vm.s.fWait, 0);
561	return rc;
562	}
563
564
565	/**
566	* Default VMR3NotifyFF() worker.
567	*
568	* @param pVM The VM handle.
569	* @param fNotifiedREM Se VMR3NotifyFF().
570	*/
571	static DECLCALLBACK(void) vmR3DefaultNotifyFF(PVM pVM, bool fNotifiedREM)
572	{
573	if (pVM->vm.s.fWait)
574	{
575	int rc = RTSemEventSignal(pVM->vm.s.EventSemWait);
576	AssertRC(rc);
577	}
578	else if (!fNotifiedREM)
579	REMR3NotifyFF(pVM);
580	}
581
582
583	/**
584	* Array with halt method descriptors.
585	* VMINT::iHaltMethod contains an index into this array.
586	*/
587	static const struct VMHALTMETHODDESC
588	{
589	/** The halt method id. */
590	VMHALTMETHOD enmHaltMethod;
591	/** The init function for loading config and initialize variables. */
592	DECLR3CALLBACKMEMBER(int, pfnInit,(PVM pVM));
593	/** The term function. */
594	DECLR3CALLBACKMEMBER(void, pfnTerm,(PVM pVM));
595	/** The halt function. */
596	DECLR3CALLBACKMEMBER(int, pfnHalt,(PVM pVM, const uint32_t fMask, uint64_t u64Now));
597	/** The wait function. */
598	DECLR3CALLBACKMEMBER(int, pfnWait,(PVM pVM));
599	/** The notifyFF function. */
600	DECLR3CALLBACKMEMBER(void, pfnNotifyFF,(PVM pVM, bool fNotifiedREM));
601	} g_aHaltMethods[] =
602	{
603	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
604	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1DoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
605	//{ VMHALTMETHOD_2, vmR3HaltMethod2Init, vmR3HaltMethod2Term, vmR3HaltMethod2DoWait, vmR3HaltMethod2Wait, vmR3HaltMethod2NotifyFF },
606	};
607
608
609	/**
610	* Notify the emulation thread (EMT) about pending Forced Action (FF).
611	*
612	* This function is called by thread other than EMT to make
613	* sure EMT wakes up and promptly service an FF request.
614	*
615	* @param pVM VM handle.
616	* @param fNotifiedREM Set if REM have already been notified. If clear the
617	* generic REMR3NotifyFF() method is called.
618	*/
619	VMR3DECL(void) VMR3NotifyFF(PVM pVM, bool fNotifiedREM)
620	{
621	LogFlow(("VMR3NotifyFF:\n"));
622	g_aHaltMethods[pVM->vm.s.iHaltMethod].pfnNotifyFF(pVM, fNotifiedREM);
623	}
624
625
626	/**
627	* Halted VM Wait.
628	* Any external event will unblock the thread.
629	*
630	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
631	* case an appropriate status code is returned.
632	* @param pVM VM handle.
633	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
634	* @thread The emulation thread.
635	*/
636	VMR3DECL(int) VMR3WaitHalted(PVM pVM, bool fIgnoreInterrupts)
637	{
638	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
639
640	/*
641	* Check Relevant FFs.
642	*/
643	const uint32_t fMask = !fIgnoreInterrupts
644	? VM_FF_EXTERNAL_HALTED_MASK
645	: VM_FF_EXTERNAL_HALTED_MASK & ~(VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC);
646	if (VM_FF_ISPENDING(pVM, fMask))
647	{
648	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
649	return VINF_SUCCESS;
650	}
651
652	/*
653	* The yielder is suspended while we're halting.
654	*/
655	VMMR3YieldSuspend(pVM);
656
657	/*
658	* Record halt averages for the last second.
659	*/
660	uint64_t u64Now = RTTimeNanoTS();
661	int64_t off = u64Now - pVM->vm.s.u64HaltsStartTS;
662	if (off > 1000000000)
663	{
664	if (off > _4G \|\| !pVM->vm.s.cHalts)
665	{
666	pVM->vm.s.HaltInterval = 1000000000 /* 1 sec */;
667	pVM->vm.s.HaltFrequency = 1;
668	}
669	else
670	{
671	pVM->vm.s.HaltInterval = (uint32_t)off / pVM->vm.s.cHalts;
672	pVM->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pVM->vm.s.cHalts, 1000000000, (uint32_t)off);
673	}
674	pVM->vm.s.u64HaltsStartTS = u64Now;
675	pVM->vm.s.cHalts = 0;
676	}
677	pVM->vm.s.cHalts++;
678
679	/*
680	* Do the halt.
681	*/
682	int rc = g_aHaltMethods[pVM->vm.s.iHaltMethod].pfnHalt(pVM, fMask, u64Now);
683
684	/*
685	* Resume the yielder and tell the world we're not blocking.
686	*/
687	ASMAtomicXchgU32(&pVM->vm.s.fWait, 0);
688	VMMR3YieldResume(pVM);
689
690	LogFlow(("VMR3WaitHalted: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
691	return rc;
692	}
693
694
695	/**
696	* Suspended VM Wait.
697	* Only a handful of forced actions will cause the function to
698	* return to the caller.
699	*
700	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
701	* case an appropriate status code is returned.
702	* @param pVM VM handle.
703	* @thread The emulation thread.
704	*/
705	VMR3DECL(int) VMR3Wait(PVM pVM)
706	{
707	LogFlow(("VMR3Wait:\n"));
708
709	/*
710	* Check Relevant FFs.
711	*/
712	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
713	{
714	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
715	return VINF_SUCCESS;
716	}
717
718	/*
719	* Do waiting according to the halt method (so VMR3NotifyFF
720	* doesn't have to special case anything).
721	*/
722	int rc = g_aHaltMethods[pVM->vm.s.iHaltMethod].pfnWait(pVM);
723	LogFlow(("VMR3Wait: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
724	return rc;
725	}
726
727
728	/**
729	* Changes the halt method.
730	*
731	* @returns VBox status code.
732	* @param pVM The VM handle.
733	* @param enmHaltMethod The new halt method.
734	* @thread EMT.
735	*/
736	int vmR3SetHaltMethod(PVM pVM, VMHALTMETHOD enmHaltMethod)
737	{
738	VM_ASSERT_EMT(pVM);
739	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
740
741	/*
742	* Resolve default (can be overridden in the configuration).
743	*/
744	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
745	{
746	uint32_t u32;
747	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
748	if (VBOX_SUCCESS(rc))
749	{
750	enmHaltMethod = (VMHALTMETHOD)u32;
751	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
752	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d."), enmHaltMethod);
753	}
754	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
755	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t."));
756	else
757	enmHaltMethod = VMHALTMETHOD_1;
758	//enmHaltMethod = VMHALTMETHOD_OLD;
759	}
760
761	/*
762	* Find the descriptor.
763	*/
764	unsigned i = 0;
765	while ( i < RT_ELEMENTS(g_aHaltMethods)
766	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
767	i++;
768	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
769
770	/*
771	* Terminate the old one.
772	*/
773	if ( pVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
774	&& g_aHaltMethods[pVM->vm.s.iHaltMethod].pfnTerm)
775	{
776	g_aHaltMethods[pVM->vm.s.iHaltMethod].pfnTerm(pVM);
777	pVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
778	}
779
780	/*
781	* Init the new one.
782	*/
783	memset(&pVM->vm.s.Halt, 0, sizeof(pVM->vm.s.Halt));
784	if (g_aHaltMethods[i].pfnInit)
785	{
786	int rc = g_aHaltMethods[i].pfnInit(pVM);
787	AssertRCReturn(rc, rc);
788	}
789	pVM->vm.s.enmHaltMethod = enmHaltMethod;
790	ASMAtomicXchgU32(&pVM->vm.s.iHaltMethod, i);
791	return VINF_SUCCESS;
792	}
793

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 3460

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