VMEmt.cpp@ 8155

Last change on this file since 8155 was 8155, checked in by vboxsync, 17 years ago
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1	/* $Id: VMEmt.cpp 8155 2008-04-18 15:16:47Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
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_VM
27	#include <VBox/tm.h>
28	#include <VBox/dbgf.h>
29	#include <VBox/em.h>
30	#include <VBox/pdmapi.h>
31	#include <VBox/rem.h>
32	#include "VMInternal.h"
33	#include <VBox/vm.h>
34	#include <VBox/uvm.h>
35
36	#include <VBox/err.h>
37	#include <VBox/log.h>
38	#include <iprt/assert.h>
39	#include <iprt/asm.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/string.h>
42	#include <iprt/thread.h>
43	#include <iprt/time.h>
44
45
46
47
48	/**
49	* The emulation thread.
50	*
51	* @returns Thread exit code.
52	* @param ThreadSelf The handle to the executing thread.
53	* @param pvArgs Pointer to the user mode VM structure (UVM).
54	*/
55	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
56	{
57	PUVM pUVM = (PUVM)pvArgs;
58	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
59	("Invalid arguments to the emulation thread!\n"));
60
61	/*
62	* Init the native thread member.
63	*/
64	pUVM->vm.s.NativeThreadEMT = RTThreadGetNative(ThreadSelf);
65
66	/*
67	* The request loop.
68	*/
69	int rc = VINF_SUCCESS;
70	VMSTATE enmBefore = VMSTATE_CREATING;
71	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
72	for (;;)
73	{
74	/* Requested to exit the EMT thread out of sync? (currently only VMR3WaitForResume) */
75	if (setjmp(pUVM->vm.s.emtJumpEnv) != 0)
76	{
77	rc = VINF_SUCCESS;
78	break;
79	}
80
81	/*
82	* During early init there is no pVM, so make a special path
83	* for that to keep things clearly separate.
84	*/
85	if (!pUVM->pVM)
86	{
87	/*
88	* Check for termination first.
89	*/
90	if (pUVM->vm.s.fTerminateEMT)
91	{
92	rc = VINF_EM_TERMINATE;
93	break;
94	}
95	if (pUVM->vm.s.pReqs)
96	{
97	/*
98	* Service execute in EMT request.
99	*/
100	rc = VMR3ReqProcessU(pUVM);
101	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
102	}
103	else
104	{
105	/*
106	* Nothing important is pending, so wait for something.
107	*/
108	rc = VMR3WaitU(pUVM);
109	if (VBOX_FAILURE(rc))
110	break;
111	}
112	}
113	else
114	{
115
116	/*
117	* Pending requests which needs servicing?
118	*
119	* We check for state changes in addition to status codes when
120	* servicing requests. (Look after the ifs.)
121	*/
122	PVM pVM = pUVM->pVM;
123	enmBefore = pVM->enmVMState;
124	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
125	\|\| pUVM->vm.s.fTerminateEMT)
126	{
127	rc = VINF_EM_TERMINATE;
128	break;
129	}
130	if (pUVM->vm.s.pReqs)
131	{
132	/*
133	* Service execute in EMT request.
134	*/
135	rc = VMR3ReqProcessU(pUVM);
136	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
137	}
138	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
139	{
140	/*
141	* Service the debugger request.
142	*/
143	rc = DBGFR3VMMForcedAction(pVM);
144	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
145	}
146	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
147	{
148	/*
149	* Service a delayed reset request.
150	*/
151	rc = VMR3Reset(pVM);
152	VM_FF_CLEAR(pVM, VM_FF_RESET);
153	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
154	}
155	else
156	{
157	/*
158	* Nothing important is pending, so wait for something.
159	*/
160	rc = VMR3WaitU(pUVM);
161	if (VBOX_FAILURE(rc))
162	break;
163	}
164
165	/*
166	* Check for termination requests, these have extremely high priority.
167	*/
168	if ( rc == VINF_EM_TERMINATE
169	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
170	\|\| pUVM->vm.s.fTerminateEMT)
171	break;
172	}
173
174	/*
175	* Some requests (both VMR3Req* and the DBGF) can potentially
176	* resume or start the VM, in that case we'll get a change in
177	* VM status indicating that we're now running.
178	*/
179	if ( VBOX_SUCCESS(rc)
180	&& pUVM->pVM
181	&& enmBefore != pUVM->pVM->enmVMState
182	&& pUVM->pVM->enmVMState == VMSTATE_RUNNING)
183	{
184	PVM pVM = pUVM->pVM;
185	rc = EMR3ExecuteVM(pVM);
186	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Vrc, enmVMState=%d\n", rc, pVM->enmVMState));
187	if (EMGetState(pVM) == EMSTATE_GURU_MEDITATION)
188	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
189	}
190
191	} /* forever */
192
193
194	/*
195	* Exiting.
196	*/
197	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Vrc enmBefore=%d enmVMState=%d\n",
198	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
199	if (pUVM->vm.s.fEMTDoesTheCleanup)
200	{
201	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
202	Assert(pUVM->pVM);
203	vmR3Destroy(pUVM->pVM);
204	vmR3DestroyFinalBitFromEMT(pUVM);
205	}
206	else
207	{
208	vmR3DestroyFinalBitFromEMT(pUVM);
209
210	/* we don't reset ThreadEMT here because it's used in waiting. */
211	pUVM->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
212	}
213	Log(("vmR3EmulationThread: EMT is terminated.\n"));
214	return rc;
215	}
216
217
218	/**
219	* Wait for VM to be resumed. Handle events like vmR3EmulationThread does.
220	* In case the VM is stopped, clean up and long jump to the main EMT loop.
221	*
222	* @returns VINF_SUCCESS or doesn't return
223	* @param pVM VM handle.
224	*/
225	VMR3DECL(int) VMR3WaitForResume(PVM pVM)
226	{
227	/*
228	* The request loop.
229	*/
230	PUVM pUVM = pVM->pUVM;
231	VMSTATE enmBefore;
232	int rc;
233	for (;;)
234	{
235
236	/*
237	* Pending requests which needs servicing?
238	*
239	* We check for state changes in addition to status codes when
240	* servicing requests. (Look after the ifs.)
241	*/
242	enmBefore = pVM->enmVMState;
243	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
244	\|\| pUVM->vm.s.fTerminateEMT)
245	{
246	rc = VINF_EM_TERMINATE;
247	break;
248	}
249	else if (pUVM->vm.s.pReqs)
250	{
251	/*
252	* Service execute in EMT request.
253	*/
254	rc = VMR3ReqProcessU(pUVM);
255	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
256	}
257	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
258	{
259	/*
260	* Service the debugger request.
261	*/
262	rc = DBGFR3VMMForcedAction(pVM);
263	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
264	}
265	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
266	{
267	/*
268	* Service a delay reset request.
269	*/
270	rc = VMR3Reset(pVM);
271	VM_FF_CLEAR(pVM, VM_FF_RESET);
272	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
273	}
274	else
275	{
276	/*
277	* Nothing important is pending, so wait for something.
278	*/
279	rc = VMR3WaitU(pUVM);
280	if (VBOX_FAILURE(rc))
281	break;
282	}
283
284	/*
285	* Check for termination requests, these are extremely high priority.
286	*/
287	if ( rc == VINF_EM_TERMINATE
288	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
289	\|\| pUVM->vm.s.fTerminateEMT)
290	break;
291
292	/*
293	* Some requests (both VMR3Req* and the DBGF) can potentially
294	* resume or start the VM, in that case we'll get a change in
295	* VM status indicating that we're now running.
296	*/
297	if ( VBOX_SUCCESS(rc)
298	&& enmBefore != pVM->enmVMState
299	&& pVM->enmVMState == VMSTATE_RUNNING)
300	{
301	/* Only valid exit reason. */
302	return VINF_SUCCESS;
303	}
304
305	} /* forever */
306
307	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
308	longjmp(pUVM->vm.s.emtJumpEnv, 1);
309	}
310
311
312	/**
313	* Gets the name of a halt method.
314	*
315	* @returns Pointer to a read only string.
316	* @param enmMethod The method.
317	*/
318	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
319	{
320	switch (enmMethod)
321	{
322	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
323	case VMHALTMETHOD_DEFAULT: return "default";
324	case VMHALTMETHOD_OLD: return "old";
325	case VMHALTMETHOD_1: return "method1";
326	//case VMHALTMETHOD_2: return "method2";
327	case VMHALTMETHOD_GLOBAL_1: return "global1";
328	default: return "unknown";
329	}
330	}
331
332
333	/**
334	* The old halt loop.
335	*
336	* @param pUVM Pointer to the user mode VM structure.
337	*/
338	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVM pUVM, const uint32_t fMask, uint64_t /* u64Now*/)
339	{
340	/*
341	* Halt loop.
342	*/
343	PVM pVM = pUVM->pVM;
344	int rc = VINF_SUCCESS;
345	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
346	//unsigned cLoops = 0;
347	for (;;)
348	{
349	/*
350	* Work the timers and check if we can exit.
351	* The poll call gives us the ticks left to the next event in
352	* addition to perhaps set an FF.
353	*/
354	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
355	PDMR3Poll(pVM);
356	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
357	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
358	TMR3TimerQueuesDo(pVM);
359	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
360	if (VM_FF_ISPENDING(pVM, fMask))
361	break;
362	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
363	if (VM_FF_ISPENDING(pVM, fMask))
364	break;
365
366	/*
367	* Wait for a while. Someone will wake us up or interrupt the call if
368	* anything needs our attention.
369	*/
370	if (u64NanoTS < 50000)
371	{
372	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
373	/* spin */;
374	}
375	else
376	{
377	VMMR3YieldStop(pVM);
378	//uint64_t u64Start = RTTimeNanoTS();
379	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
380	{
381	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
382	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, a);
383	RTThreadYield(); /* this is the best we can do here */
384	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, a);
385	}
386	else if (u64NanoTS < 2000000)
387	{
388	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
389	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
390	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1);
391	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
392	}
393	else
394	{
395	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
396	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
397	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
398	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
399	}
400	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
401	//RTLogPrintf(" -> rc=%Vrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
402	}
403	if (rc == VERR_TIMEOUT)
404	rc = VINF_SUCCESS;
405	else if (VBOX_FAILURE(rc))
406	{
407	AssertRC(rc != VERR_INTERRUPTED);
408	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
409	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
410	VM_FF_SET(pVM, VM_FF_TERMINATE);
411	rc = VERR_INTERNAL_ERROR;
412	break;
413	}
414	}
415
416	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
417	return rc;
418	}
419
420
421	/**
422	* Initialize the configuration of halt method 1 & 2.
423	*
424	* @return VBox status code. Failure on invalid CFGM data.
425	* @param pVM The VM handle.
426	*/
427	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
428	{
429	/*
430	* The defaults.
431	*/
432	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
433	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
434	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
435	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
436	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
437	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
438	#else
439	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
440	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
441	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
442	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
443	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
444	#endif
445
446	/*
447	* Query overrides.
448	*
449	* I don't have time to bother with niceities such as invalid value checks
450	* here right now. sorry.
451	*/
452	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
453	if (pCfg)
454	{
455	uint32_t u32;
456	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
457	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
458	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
459	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
460	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
461	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
462	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
463	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
464	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
465	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
466	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
467	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
468	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
469	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
470	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
471	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
472	}
473
474	return VINF_SUCCESS;
475	}
476
477
478	/**
479	* Initialize halt method 1.
480	*
481	* @return VBox status code.
482	* @param pUVM Pointer to the user mode VM structure.
483	*/
484	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
485	{
486	return vmR3HaltMethod12ReadConfigU(pUVM);
487	}
488
489
490	/**
491	* Method 1 - Block whenever possible, and when lagging behind
492	* switch to spinning for 10-30ms with occational blocking until
493	* the lag has been eliminated.
494	*/
495	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
496	{
497	PVM pVM = pUVM->pVM;
498
499	/*
500	* To simplify things, we decide up-front whether we should switch to spinning or
501	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
502	* and that it will generate interrupts or other events that will cause us to exit
503	* the halt loop.
504	*/
505	bool fBlockOnce = false;
506	bool fSpinning = false;
507	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
508	if (u32CatchUpPct /* non-zero if catching up */)
509	{
510	if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
511	{
512	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
513	if (fSpinning)
514	{
515	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
516	fBlockOnce = u64Now - pUVM->vm.s.Halt.Method12.u64LastBlockTS
517	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
518	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
519	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
520	}
521	else
522	{
523	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
524	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
525	}
526	}
527	else
528	{
529	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
530	if (fSpinning)
531	pUVM->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
532	}
533	}
534	else if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
535	{
536	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
537	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
538	}
539
540	/*
541	* Halt loop.
542	*/
543	int rc = VINF_SUCCESS;
544	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
545	unsigned cLoops = 0;
546	for (;; cLoops++)
547	{
548	/*
549	* Work the timers and check if we can exit.
550	*/
551	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
552	PDMR3Poll(pVM);
553	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
554	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
555	TMR3TimerQueuesDo(pVM);
556	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
557	if (VM_FF_ISPENDING(pVM, fMask))
558	break;
559
560	/*
561	* Estimate time left to the next event.
562	*/
563	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
564	if (VM_FF_ISPENDING(pVM, fMask))
565	break;
566
567	/*
568	* Block if we're not spinning and the interval isn't all that small.
569	*/
570	if ( ( !fSpinning
571	\|\| fBlockOnce)
572	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
573	&& u64NanoTS >= 100000) /* 0.100 ms */
574	#else
575	&& u64NanoTS >= 250000) /* 0.250 ms */
576	#endif
577	{
578	const uint64_t Start = pUVM->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
579	VMMR3YieldStop(pVM);
580
581	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
582	if (cMilliSecs <= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
583	cMilliSecs = 1;
584	else
585	cMilliSecs -= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
586	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
587	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
588	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, cMilliSecs);
589	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
590	if (rc == VERR_TIMEOUT)
591	rc = VINF_SUCCESS;
592	else if (VBOX_FAILURE(rc))
593	{
594	AssertRC(rc != VERR_INTERRUPTED);
595	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
596	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
597	VM_FF_SET(pVM, VM_FF_TERMINATE);
598	rc = VERR_INTERNAL_ERROR;
599	break;
600	}
601
602	/*
603	* Calc the statistics.
604	* Update averages every 16th time, and flush parts of the history every 64th time.
605	*/
606	const uint64_t Elapsed = RTTimeNanoTS() - Start;
607	pUVM->vm.s.Halt.Method12.cNSBlocked += Elapsed;
608	if (Elapsed > u64NanoTS)
609	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
610	pUVM->vm.s.Halt.Method12.cBlocks++;
611	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0xf))
612	{
613	pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVM->vm.s.Halt.Method12.cNSBlockedTooLong / pUVM->vm.s.Halt.Method12.cBlocks;
614	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0x3f))
615	{
616	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong = pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
617	pUVM->vm.s.Halt.Method12.cBlocks = 0x40;
618	}
619	}
620	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
621
622	/*
623	* Clear the block once flag if we actually blocked.
624	*/
625	if ( fBlockOnce
626	&& Elapsed > 100000 /* 0.1 ms */)
627	fBlockOnce = false;
628	}
629	}
630	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
631
632	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
633	return rc;
634	}
635
636
637	/**
638	* Initialize the global 1 halt method.
639	*
640	* @return VBox status code.
641	* @param pUVM Pointer to the user mode VM structure.
642	*/
643	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
644	{
645	return VINF_SUCCESS;
646	}
647
648
649	/**
650	* The global 1 halt method - Block in GMM (ring-0) and let it
651	* try take care of the global scheduling of EMT threads.
652	*/
653	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
654	{
655	PVM pVM = pUVM->pVM;
656
657	/*
658	* Halt loop.
659	*/
660	int rc = VINF_SUCCESS;
661	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
662	unsigned cLoops = 0;
663	for (;; cLoops++)
664	{
665	/*
666	* Work the timers and check if we can exit.
667	*/
668	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
669	PDMR3Poll(pVM);
670	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
671	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
672	TMR3TimerQueuesDo(pVM);
673	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
674	if (VM_FF_ISPENDING(pVM, fMask))
675	break;
676
677	/*
678	* Estimate time left to the next event.
679	*/
680	uint64_t u64Delta;
681	uint64_t u64GipTime = TMTimerPollGIP(pVM, &u64Delta);
682	if (VM_FF_ISPENDING(pVM, fMask))
683	break;
684
685	/*
686	* Block if we're not spinning and the interval isn't all that small.
687	*/
688	if (u64Delta > 50000 /* 0.050ms */)
689	{
690	VMMR3YieldStop(pVM);
691	if (VM_FF_ISPENDING(pVM, fMask))
692	break;
693
694	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
695	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, c);
696	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
697	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, c);
698	if (rc == VERR_INTERRUPTED)
699	rc = VINF_SUCCESS;
700	else if (VBOX_FAILURE(rc))
701	{
702	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Vrc\n", rc));
703	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
704	VM_FF_SET(pVM, VM_FF_TERMINATE);
705	rc = VERR_INTERNAL_ERROR;
706	break;
707	}
708	}
709	/*
710	* When spinning call upon the GVMM and do some wakups once
711	* in a while, it's not like we're actually busy or anything.
712	*/
713	else if (!(cLoops & 0x1fff))
714	{
715	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, d);
716	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
717	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, d);
718	}
719	}
720	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
721
722	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
723	return rc;
724	}
725
726
727	/**
728	* The global 1 halt method - VMR3Wait() worker.
729	*
730	* @returns VBox status code.
731	* @param pUVM Pointer to the user mode VM structure.
732	*/
733	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVM pUVM)
734	{
735	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
736
737	PVM pVM = pUVM->pVM;
738	int rc = VINF_SUCCESS;
739	for (;;)
740	{
741	/*
742	* Check Relevant FFs.
743	*/
744	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
745	break;
746
747	/*
748	* Wait for a while. Someone will wake us up or interrupt the call if
749	* anything needs our attention.
750	*/
751	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
752	if (rc == VERR_INTERRUPTED)
753	rc = VINF_SUCCESS;
754	else if (VBOX_FAILURE(rc))
755	{
756	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
757	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
758	VM_FF_SET(pVM, VM_FF_TERMINATE);
759	rc = VERR_INTERNAL_ERROR;
760	break;
761	}
762
763	}
764
765	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
766	return rc;
767	}
768
769
770	/**
771	* The global 1 halt method - VMR3NotifyFF() worker.
772	*
773	* @param pUVM Pointer to the user mode VM structure.
774	* @param fNotifiedREM See VMR3NotifyFF().
775	*/
776	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyFF(PUVM pUVM, bool fNotifiedREM)
777	{
778	if (pUVM->vm.s.fWait)
779	{
780	int rc = SUPCallVMMR0Ex(pUVM->pVM->pVMR0, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
781	AssertRC(rc);
782	}
783	else if (!fNotifiedREM)
784	REMR3NotifyFF(pUVM->pVM);
785	}
786
787
788	/**
789	* Bootstrap VMR3Wait() worker.
790	*
791	* @returns VBox status code.
792	* @param pUVM Pointer to the user mode VM structure.
793	*/
794	static DECLCALLBACK(int) vmR3BootstrapWait(PUVM pUVM)
795	{
796	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
797
798	int rc = VINF_SUCCESS;
799	for (;;)
800	{
801	/*
802	* Check Relevant FFs.
803	*/
804	if (pUVM->vm.s.pReqs)
805	break;
806	if ( pUVM->pVM
807	&& VM_FF_ISPENDING(pUVM->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
808	break;
809	if (pUVM->vm.s.fTerminateEMT)
810	break;
811
812	/*
813	* Wait for a while. Someone will wake us up or interrupt the call if
814	* anything needs our attention.
815	*/
816	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
817	if (rc == VERR_TIMEOUT)
818	rc = VINF_SUCCESS;
819	else if (VBOX_FAILURE(rc))
820	{
821	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
822	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
823	if (pUVM->pVM)
824	VM_FF_SET(pUVM->pVM, VM_FF_TERMINATE);
825	rc = VERR_INTERNAL_ERROR;
826	break;
827	}
828
829	}
830
831	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
832	return rc;
833	}
834
835
836	/**
837	* Bootstrap VMR3NotifyFF() worker.
838	*
839	* @param pUVM Pointer to the user mode VM structure.
840	* @param fNotifiedREM See VMR3NotifyFF().
841	*/
842	static DECLCALLBACK(void) vmR3BootstrapNotifyFF(PUVM pUVM, bool fNotifiedREM)
843	{
844	if (pUVM->vm.s.fWait)
845	{
846	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
847	AssertRC(rc);
848	}
849	}
850
851
852
853	/**
854	* Default VMR3Wait() worker.
855	*
856	* @returns VBox status code.
857	* @param pUVM Pointer to the user mode VM structure.
858	*/
859	static DECLCALLBACK(int) vmR3DefaultWait(PUVM pUVM)
860	{
861	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
862
863	PVM pVM = pUVM->pVM;
864	int rc = VINF_SUCCESS;
865	for (;;)
866	{
867	/*
868	* Check Relevant FFs.
869	*/
870	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
871	break;
872
873	/*
874	* Wait for a while. Someone will wake us up or interrupt the call if
875	* anything needs our attention.
876	*/
877	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
878	if (rc == VERR_TIMEOUT)
879	rc = VINF_SUCCESS;
880	else if (VBOX_FAILURE(rc))
881	{
882	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
883	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
884	VM_FF_SET(pVM, VM_FF_TERMINATE);
885	rc = VERR_INTERNAL_ERROR;
886	break;
887	}
888
889	}
890
891	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
892	return rc;
893	}
894
895
896	/**
897	* Default VMR3NotifyFF() worker.
898	*
899	* @param pUVM Pointer to the user mode VM structure.
900	* @param fNotifiedREM See VMR3NotifyFF().
901	*/
902	static DECLCALLBACK(void) vmR3DefaultNotifyFF(PUVM pUVM, bool fNotifiedREM)
903	{
904	if (pUVM->vm.s.fWait)
905	{
906	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
907	AssertRC(rc);
908	}
909	else if (!fNotifiedREM)
910	REMR3NotifyFF(pUVM->pVM);
911	}
912
913
914	/**
915	* Array with halt method descriptors.
916	* VMINT::iHaltMethod contains an index into this array.
917	*/
918	static const struct VMHALTMETHODDESC
919	{
920	/** The halt method id. */
921	VMHALTMETHOD enmHaltMethod;
922	/** The init function for loading config and initialize variables. */
923	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
924	/** The term function. */
925	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
926	/** The halt function. */
927	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVM pUVM, const uint32_t fMask, uint64_t u64Now));
928	/** The wait function. */
929	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVM pUVM));
930	/** The notifyFF function. */
931	DECLR3CALLBACKMEMBER(void, pfnNotifyFF,(PUVM pUVM, bool fNotifiedREM));
932	} g_aHaltMethods[] =
933	{
934	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyFF },
935	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
936	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyFF },
937	//{ VMHALTMETHOD_2, vmR3HaltMethod2Init, vmR3HaltMethod2Term, vmR3HaltMethod2DoHalt, vmR3HaltMethod2Wait, vmR3HaltMethod2NotifyFF },
938	{ VMHALTMETHOD_GLOBAL_1,vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyFF },
939	};
940
941
942	/**
943	* Notify the emulation thread (EMT) about pending Forced Action (FF).
944	*
945	* This function is called by thread other than EMT to make
946	* sure EMT wakes up and promptly service an FF request.
947	*
948	* @param pVM VM handle.
949	* @param fNotifiedREM Set if REM have already been notified. If clear the
950	* generic REMR3NotifyFF() method is called.
951	*/
952	VMR3DECL(void) VMR3NotifyFF(PVM pVM, bool fNotifiedREM)
953	{
954	LogFlow(("VMR3NotifyFF:\n"));
955	PUVM pUVM = pVM->pUVM;
956	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
957	}
958
959
960	/**
961	* Notify the emulation thread (EMT) about pending Forced Action (FF).
962	*
963	* This function is called by thread other than EMT to make
964	* sure EMT wakes up and promptly service an FF request.
965	*
966	* @param pUVM Pointer to the user mode VM structure.
967	* @param fNotifiedREM Set if REM have already been notified. If clear the
968	* generic REMR3NotifyFF() method is called.
969	*/
970	VMR3DECL(void) VMR3NotifyFFU(PUVM pUVM, bool fNotifiedREM)
971	{
972	LogFlow(("VMR3NotifyFF:\n"));
973	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
974	}
975
976
977	/**
978	* Halted VM Wait.
979	* Any external event will unblock the thread.
980	*
981	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
982	* case an appropriate status code is returned.
983	* @param pVM VM handle.
984	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
985	* @thread The emulation thread.
986	*/
987	VMR3DECL(int) VMR3WaitHalted(PVM pVM, bool fIgnoreInterrupts)
988	{
989	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
990
991	/*
992	* Check Relevant FFs.
993	*/
994	const uint32_t fMask = !fIgnoreInterrupts
995	? VM_FF_EXTERNAL_HALTED_MASK
996	: VM_FF_EXTERNAL_HALTED_MASK & ~(VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC);
997	if (VM_FF_ISPENDING(pVM, fMask))
998	{
999	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1000	return VINF_SUCCESS;
1001	}
1002
1003	/*
1004	* The yielder is suspended while we're halting.
1005	*/
1006	VMMR3YieldSuspend(pVM);
1007
1008	/*
1009	* Record halt averages for the last second.
1010	*/
1011	PUVM pUVM = pVM->pUVM;
1012	uint64_t u64Now = RTTimeNanoTS();
1013	int64_t off = u64Now - pUVM->vm.s.u64HaltsStartTS;
1014	if (off > 1000000000)
1015	{
1016	if (off > _4G \|\| !pUVM->vm.s.cHalts)
1017	{
1018	pUVM->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1019	pUVM->vm.s.HaltFrequency = 1;
1020	}
1021	else
1022	{
1023	pUVM->vm.s.HaltInterval = (uint32_t)off / pUVM->vm.s.cHalts;
1024	pUVM->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVM->vm.s.cHalts, 1000000000, (uint32_t)off);
1025	}
1026	pUVM->vm.s.u64HaltsStartTS = u64Now;
1027	pUVM->vm.s.cHalts = 0;
1028	}
1029	pUVM->vm.s.cHalts++;
1030
1031	/*
1032	* Do the halt.
1033	*/
1034	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVM, fMask, u64Now);
1035
1036	/*
1037	* Resume the yielder.
1038	*/
1039	VMMR3YieldResume(pVM);
1040
1041	LogFlow(("VMR3WaitHalted: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
1042	return rc;
1043	}
1044
1045
1046	/**
1047	* Suspended VM Wait.
1048	* Only a handful of forced actions will cause the function to
1049	* return to the caller.
1050	*
1051	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1052	* case an appropriate status code is returned.
1053	* @param pUVM Pointer to the user mode VM structure.
1054	* @thread The emulation thread.
1055	*/
1056	VMR3DECL(int) VMR3WaitU(PUVM pUVM)
1057	{
1058	LogFlow(("VMR3WaitU:\n"));
1059
1060	/*
1061	* Check Relevant FFs.
1062	*/
1063	PVM pVM = pUVM->pVM;
1064	if ( pVM
1065	&& VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
1066	{
1067	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1068	return VINF_SUCCESS;
1069	}
1070
1071	/*
1072	* Do waiting according to the halt method (so VMR3NotifyFF
1073	* doesn't have to special case anything).
1074	*/
1075	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVM);
1076	LogFlow(("VMR3WaitU: returns %Vrc (FF %#x)\n", rc, pVM ? pVM->fForcedActions : 0));
1077	return rc;
1078	}
1079
1080
1081	/**
1082	* Changes the halt method.
1083	*
1084	* @returns VBox status code.
1085	* @param pUVM Pointer to the user mode VM structure.
1086	* @param enmHaltMethod The new halt method.
1087	* @thread EMT.
1088	*/
1089	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1090	{
1091	PVM pVM = pUVM->pVM; Assert(pVM);
1092	VM_ASSERT_EMT(pVM);
1093	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1094
1095	/*
1096	* Resolve default (can be overridden in the configuration).
1097	*/
1098	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1099	{
1100	uint32_t u32;
1101	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1102	if (VBOX_SUCCESS(rc))
1103	{
1104	enmHaltMethod = (VMHALTMETHOD)u32;
1105	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1106	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1107	}
1108	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1109	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1110	else
1111	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1112	//enmHaltMethod = VMHALTMETHOD_1;
1113	//enmHaltMethod = VMHALTMETHOD_OLD;
1114	}
1115	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1116
1117	/*
1118	* Find the descriptor.
1119	*/
1120	unsigned i = 0;
1121	while ( i < RT_ELEMENTS(g_aHaltMethods)
1122	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1123	i++;
1124	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1125
1126	/*
1127	* Terminate the old one.
1128	*/
1129	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1130	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1131	{
1132	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1133	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1134	}
1135
1136	/*
1137	* Init the new one.
1138	*/
1139	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1140	if (g_aHaltMethods[i].pfnInit)
1141	{
1142	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1143	AssertRCReturn(rc, rc);
1144	}
1145	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1146
1147	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1148	return VINF_SUCCESS;
1149	}
1150

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 8155

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