VMEmt.cpp@ 12986

Last change on this file since 12986 was 12549, checked in by vboxsync, 16 years ago
VMM: Implemented a TSC mode where it's tied to execution and halt (optionally). Fixes #3182.
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File size: 37.5 KB

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1	/* $Id: VMEmt.cpp 12549 2008-09-17 18:02:02Z 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 <VBox/tm.h>
33	#include "VMInternal.h"
34	#include <VBox/vm.h>
35	#include <VBox/uvm.h>
36
37	#include <VBox/err.h>
38	#include <VBox/log.h>
39	#include <iprt/assert.h>
40	#include <iprt/asm.h>
41	#include <iprt/semaphore.h>
42	#include <iprt/string.h>
43	#include <iprt/thread.h>
44	#include <iprt/time.h>
45
46
47
48
49	/**
50	* The emulation thread.
51	*
52	* @returns Thread exit code.
53	* @param ThreadSelf The handle to the executing thread.
54	* @param pvArgs Pointer to the user mode VM structure (UVM).
55	*/
56	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
57	{
58	PUVM pUVM = (PUVM)pvArgs;
59	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
60	("Invalid arguments to the emulation thread!\n"));
61
62	/*
63	* Init the native thread member.
64	*/
65	pUVM->vm.s.NativeThreadEMT = RTThreadGetNative(ThreadSelf);
66
67	/*
68	* The request loop.
69	*/
70	int rc = VINF_SUCCESS;
71	VMSTATE enmBefore = VMSTATE_CREATING;
72	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
73	for (;;)
74	{
75	/* Requested to exit the EMT thread out of sync? (currently only VMR3WaitForResume) */
76	if (setjmp(pUVM->vm.s.emtJumpEnv) != 0)
77	{
78	rc = VINF_SUCCESS;
79	break;
80	}
81
82	/*
83	* During early init there is no pVM, so make a special path
84	* for that to keep things clearly separate.
85	*/
86	if (!pUVM->pVM)
87	{
88	/*
89	* Check for termination first.
90	*/
91	if (pUVM->vm.s.fTerminateEMT)
92	{
93	rc = VINF_EM_TERMINATE;
94	break;
95	}
96	if (pUVM->vm.s.pReqs)
97	{
98	/*
99	* Service execute in EMT request.
100	*/
101	rc = VMR3ReqProcessU(pUVM);
102	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
103	}
104	else
105	{
106	/*
107	* Nothing important is pending, so wait for something.
108	*/
109	rc = VMR3WaitU(pUVM);
110	if (VBOX_FAILURE(rc))
111	break;
112	}
113	}
114	else
115	{
116
117	/*
118	* Pending requests which needs servicing?
119	*
120	* We check for state changes in addition to status codes when
121	* servicing requests. (Look after the ifs.)
122	*/
123	PVM pVM = pUVM->pVM;
124	enmBefore = pVM->enmVMState;
125	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
126	\|\| pUVM->vm.s.fTerminateEMT)
127	{
128	rc = VINF_EM_TERMINATE;
129	break;
130	}
131	if (pUVM->vm.s.pReqs)
132	{
133	/*
134	* Service execute in EMT request.
135	*/
136	rc = VMR3ReqProcessU(pUVM);
137	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
138	}
139	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
140	{
141	/*
142	* Service the debugger request.
143	*/
144	rc = DBGFR3VMMForcedAction(pVM);
145	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
146	}
147	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
148	{
149	/*
150	* Service a delayed reset request.
151	*/
152	rc = VMR3Reset(pVM);
153	VM_FF_CLEAR(pVM, VM_FF_RESET);
154	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
155	}
156	else
157	{
158	/*
159	* Nothing important is pending, so wait for something.
160	*/
161	rc = VMR3WaitU(pUVM);
162	if (VBOX_FAILURE(rc))
163	break;
164	}
165
166	/*
167	* Check for termination requests, these have extremely high priority.
168	*/
169	if ( rc == VINF_EM_TERMINATE
170	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
171	\|\| pUVM->vm.s.fTerminateEMT)
172	break;
173	}
174
175	/*
176	* Some requests (both VMR3Req* and the DBGF) can potentially
177	* resume or start the VM, in that case we'll get a change in
178	* VM status indicating that we're now running.
179	*/
180	if ( VBOX_SUCCESS(rc)
181	&& pUVM->pVM
182	&& enmBefore != pUVM->pVM->enmVMState
183	&& pUVM->pVM->enmVMState == VMSTATE_RUNNING)
184	{
185	PVM pVM = pUVM->pVM;
186	rc = EMR3ExecuteVM(pVM);
187	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Vrc, enmVMState=%d\n", rc, pVM->enmVMState));
188	if ( EMGetState(pVM) == EMSTATE_GURU_MEDITATION
189	&& pVM->enmVMState == VMSTATE_RUNNING)
190	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
191	}
192
193	} /* forever */
194
195
196	/*
197	* Exiting.
198	*/
199	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Vrc enmBefore=%d enmVMState=%d\n",
200	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
201	if (pUVM->vm.s.fEMTDoesTheCleanup)
202	{
203	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
204	Assert(pUVM->pVM);
205	vmR3Destroy(pUVM->pVM);
206	vmR3DestroyFinalBitFromEMT(pUVM);
207	}
208	else
209	{
210	vmR3DestroyFinalBitFromEMT(pUVM);
211
212	/* we don't reset ThreadEMT here because it's used in waiting. */
213	pUVM->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
214	}
215	Log(("vmR3EmulationThread: EMT is terminated.\n"));
216	return rc;
217	}
218
219
220	/**
221	* Wait for VM to be resumed. Handle events like vmR3EmulationThread does.
222	* In case the VM is stopped, clean up and long jump to the main EMT loop.
223	*
224	* @returns VINF_SUCCESS or doesn't return
225	* @param pVM VM handle.
226	*/
227	VMR3DECL(int) VMR3WaitForResume(PVM pVM)
228	{
229	/*
230	* The request loop.
231	*/
232	PUVM pUVM = pVM->pUVM;
233	VMSTATE enmBefore;
234	int rc;
235	for (;;)
236	{
237
238	/*
239	* Pending requests which needs servicing?
240	*
241	* We check for state changes in addition to status codes when
242	* servicing requests. (Look after the ifs.)
243	*/
244	enmBefore = pVM->enmVMState;
245	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
246	\|\| pUVM->vm.s.fTerminateEMT)
247	{
248	rc = VINF_EM_TERMINATE;
249	break;
250	}
251	else if (pUVM->vm.s.pReqs)
252	{
253	/*
254	* Service execute in EMT request.
255	*/
256	rc = VMR3ReqProcessU(pUVM);
257	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
258	}
259	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
260	{
261	/*
262	* Service the debugger request.
263	*/
264	rc = DBGFR3VMMForcedAction(pVM);
265	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
266	}
267	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
268	{
269	/*
270	* Service a delay reset request.
271	*/
272	rc = VMR3Reset(pVM);
273	VM_FF_CLEAR(pVM, VM_FF_RESET);
274	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
275	}
276	else
277	{
278	/*
279	* Nothing important is pending, so wait for something.
280	*/
281	rc = VMR3WaitU(pUVM);
282	if (VBOX_FAILURE(rc))
283	break;
284	}
285
286	/*
287	* Check for termination requests, these are extremely high priority.
288	*/
289	if ( rc == VINF_EM_TERMINATE
290	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
291	\|\| pUVM->vm.s.fTerminateEMT)
292	break;
293
294	/*
295	* Some requests (both VMR3Req* and the DBGF) can potentially
296	* resume or start the VM, in that case we'll get a change in
297	* VM status indicating that we're now running.
298	*/
299	if ( VBOX_SUCCESS(rc)
300	&& enmBefore != pVM->enmVMState
301	&& pVM->enmVMState == VMSTATE_RUNNING)
302	{
303	/* Only valid exit reason. */
304	return VINF_SUCCESS;
305	}
306
307	} /* forever */
308
309	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
310	longjmp(pUVM->vm.s.emtJumpEnv, 1);
311	}
312
313
314	/**
315	* Gets the name of a halt method.
316	*
317	* @returns Pointer to a read only string.
318	* @param enmMethod The method.
319	*/
320	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
321	{
322	switch (enmMethod)
323	{
324	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
325	case VMHALTMETHOD_DEFAULT: return "default";
326	case VMHALTMETHOD_OLD: return "old";
327	case VMHALTMETHOD_1: return "method1";
328	//case VMHALTMETHOD_2: return "method2";
329	case VMHALTMETHOD_GLOBAL_1: return "global1";
330	default: return "unknown";
331	}
332	}
333
334
335	/**
336	* The old halt loop.
337	*
338	* @param pUVM Pointer to the user mode VM structure.
339	*/
340	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVM pUVM, const uint32_t fMask, uint64_t /* u64Now*/)
341	{
342	/*
343	* Halt loop.
344	*/
345	PVM pVM = pUVM->pVM;
346	int rc = VINF_SUCCESS;
347	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
348	//unsigned cLoops = 0;
349	for (;;)
350	{
351	/*
352	* Work the timers and check if we can exit.
353	* The poll call gives us the ticks left to the next event in
354	* addition to perhaps set an FF.
355	*/
356	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
357	PDMR3Poll(pVM);
358	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
359	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
360	TMR3TimerQueuesDo(pVM);
361	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
362	if (VM_FF_ISPENDING(pVM, fMask))
363	break;
364	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
365	if (VM_FF_ISPENDING(pVM, fMask))
366	break;
367
368	/*
369	* Wait for a while. Someone will wake us up or interrupt the call if
370	* anything needs our attention.
371	*/
372	if (u64NanoTS < 50000)
373	{
374	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
375	/* spin */;
376	}
377	else
378	{
379	VMMR3YieldStop(pVM);
380	//uint64_t u64Start = RTTimeNanoTS();
381	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
382	{
383	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
384	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, a);
385	RTThreadYield(); /* this is the best we can do here */
386	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, a);
387	}
388	else if (u64NanoTS < 2000000)
389	{
390	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
391	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
392	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1);
393	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
394	}
395	else
396	{
397	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
398	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
399	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
400	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
401	}
402	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
403	//RTLogPrintf(" -> rc=%Vrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
404	}
405	if (rc == VERR_TIMEOUT)
406	rc = VINF_SUCCESS;
407	else if (VBOX_FAILURE(rc))
408	{
409	AssertRC(rc != VERR_INTERRUPTED);
410	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
411	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
412	VM_FF_SET(pVM, VM_FF_TERMINATE);
413	rc = VERR_INTERNAL_ERROR;
414	break;
415	}
416	}
417
418	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
419	return rc;
420	}
421
422
423	/**
424	* Initialize the configuration of halt method 1 & 2.
425	*
426	* @return VBox status code. Failure on invalid CFGM data.
427	* @param pVM The VM handle.
428	*/
429	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
430	{
431	/*
432	* The defaults.
433	*/
434	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
435	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
436	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
437	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
438	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
439	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
440	#else
441	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
442	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
443	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
444	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
445	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
446	#endif
447
448	/*
449	* Query overrides.
450	*
451	* I don't have time to bother with niceities such as invalid value checks
452	* here right now. sorry.
453	*/
454	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
455	if (pCfg)
456	{
457	uint32_t u32;
458	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
459	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
460	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
461	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
462	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
463	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
464	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
465	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
466	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
467	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
468	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
469	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
470	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
471	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
472	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
473	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
474	}
475
476	return VINF_SUCCESS;
477	}
478
479
480	/**
481	* Initialize halt method 1.
482	*
483	* @return VBox status code.
484	* @param pUVM Pointer to the user mode VM structure.
485	*/
486	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
487	{
488	return vmR3HaltMethod12ReadConfigU(pUVM);
489	}
490
491
492	/**
493	* Method 1 - Block whenever possible, and when lagging behind
494	* switch to spinning for 10-30ms with occational blocking until
495	* the lag has been eliminated.
496	*/
497	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
498	{
499	PVM pVM = pUVM->pVM;
500
501	/*
502	* To simplify things, we decide up-front whether we should switch to spinning or
503	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
504	* and that it will generate interrupts or other events that will cause us to exit
505	* the halt loop.
506	*/
507	bool fBlockOnce = false;
508	bool fSpinning = false;
509	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
510	if (u32CatchUpPct /* non-zero if catching up */)
511	{
512	if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
513	{
514	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
515	if (fSpinning)
516	{
517	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
518	fBlockOnce = u64Now - pUVM->vm.s.Halt.Method12.u64LastBlockTS
519	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
520	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
521	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
522	}
523	else
524	{
525	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
526	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
527	}
528	}
529	else
530	{
531	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
532	if (fSpinning)
533	pUVM->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
534	}
535	}
536	else if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
537	{
538	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
539	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
540	}
541
542	/*
543	* Halt loop.
544	*/
545	int rc = VINF_SUCCESS;
546	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
547	unsigned cLoops = 0;
548	for (;; cLoops++)
549	{
550	/*
551	* Work the timers and check if we can exit.
552	*/
553	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
554	PDMR3Poll(pVM);
555	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
556	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
557	TMR3TimerQueuesDo(pVM);
558	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
559	if (VM_FF_ISPENDING(pVM, fMask))
560	break;
561
562	/*
563	* Estimate time left to the next event.
564	*/
565	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
566	if (VM_FF_ISPENDING(pVM, fMask))
567	break;
568
569	/*
570	* Block if we're not spinning and the interval isn't all that small.
571	*/
572	if ( ( !fSpinning
573	\|\| fBlockOnce)
574	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
575	&& u64NanoTS >= 100000) /* 0.100 ms */
576	#else
577	&& u64NanoTS >= 250000) /* 0.250 ms */
578	#endif
579	{
580	const uint64_t Start = pUVM->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
581	VMMR3YieldStop(pVM);
582
583	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
584	if (cMilliSecs <= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
585	cMilliSecs = 1;
586	else
587	cMilliSecs -= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
588	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
589	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
590	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, cMilliSecs);
591	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
592	if (rc == VERR_TIMEOUT)
593	rc = VINF_SUCCESS;
594	else if (VBOX_FAILURE(rc))
595	{
596	AssertRC(rc != VERR_INTERRUPTED);
597	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
598	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
599	VM_FF_SET(pVM, VM_FF_TERMINATE);
600	rc = VERR_INTERNAL_ERROR;
601	break;
602	}
603
604	/*
605	* Calc the statistics.
606	* Update averages every 16th time, and flush parts of the history every 64th time.
607	*/
608	const uint64_t Elapsed = RTTimeNanoTS() - Start;
609	pUVM->vm.s.Halt.Method12.cNSBlocked += Elapsed;
610	if (Elapsed > u64NanoTS)
611	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
612	pUVM->vm.s.Halt.Method12.cBlocks++;
613	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0xf))
614	{
615	pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVM->vm.s.Halt.Method12.cNSBlockedTooLong / pUVM->vm.s.Halt.Method12.cBlocks;
616	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0x3f))
617	{
618	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong = pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
619	pUVM->vm.s.Halt.Method12.cBlocks = 0x40;
620	}
621	}
622	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
623
624	/*
625	* Clear the block once flag if we actually blocked.
626	*/
627	if ( fBlockOnce
628	&& Elapsed > 100000 /* 0.1 ms */)
629	fBlockOnce = false;
630	}
631	}
632	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
633
634	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
635	return rc;
636	}
637
638
639	/**
640	* Initialize the global 1 halt method.
641	*
642	* @return VBox status code.
643	* @param pUVM Pointer to the user mode VM structure.
644	*/
645	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
646	{
647	return VINF_SUCCESS;
648	}
649
650
651	/**
652	* The global 1 halt method - Block in GMM (ring-0) and let it
653	* try take care of the global scheduling of EMT threads.
654	*/
655	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
656	{
657	PVM pVM = pUVM->pVM;
658
659	/*
660	* Halt loop.
661	*/
662	int rc = VINF_SUCCESS;
663	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
664	unsigned cLoops = 0;
665	for (;; cLoops++)
666	{
667	/*
668	* Work the timers and check if we can exit.
669	*/
670	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
671	PDMR3Poll(pVM);
672	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
673	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
674	TMR3TimerQueuesDo(pVM);
675	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
676	if (VM_FF_ISPENDING(pVM, fMask))
677	break;
678
679	/*
680	* Estimate time left to the next event.
681	*/
682	uint64_t u64Delta;
683	uint64_t u64GipTime = TMTimerPollGIP(pVM, &u64Delta);
684	if (VM_FF_ISPENDING(pVM, fMask))
685	break;
686
687	/*
688	* Block if we're not spinning and the interval isn't all that small.
689	*/
690	if (u64Delta > 50000 /* 0.050ms */)
691	{
692	VMMR3YieldStop(pVM);
693	if (VM_FF_ISPENDING(pVM, fMask))
694	break;
695
696	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
697	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, c);
698	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
699	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, c);
700	if (rc == VERR_INTERRUPTED)
701	rc = VINF_SUCCESS;
702	else if (VBOX_FAILURE(rc))
703	{
704	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Vrc\n", rc));
705	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
706	VM_FF_SET(pVM, VM_FF_TERMINATE);
707	rc = VERR_INTERNAL_ERROR;
708	break;
709	}
710	}
711	/*
712	* When spinning call upon the GVMM and do some wakups once
713	* in a while, it's not like we're actually busy or anything.
714	*/
715	else if (!(cLoops & 0x1fff))
716	{
717	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, d);
718	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
719	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, d);
720	}
721	}
722	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
723
724	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
725	return rc;
726	}
727
728
729	/**
730	* The global 1 halt method - VMR3Wait() worker.
731	*
732	* @returns VBox status code.
733	* @param pUVM Pointer to the user mode VM structure.
734	*/
735	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVM pUVM)
736	{
737	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
738
739	PVM pVM = pUVM->pVM;
740	int rc = VINF_SUCCESS;
741	for (;;)
742	{
743	/*
744	* Check Relevant FFs.
745	*/
746	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
747	break;
748
749	/*
750	* Wait for a while. Someone will wake us up or interrupt the call if
751	* anything needs our attention.
752	*/
753	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
754	if (rc == VERR_INTERRUPTED)
755	rc = VINF_SUCCESS;
756	else if (VBOX_FAILURE(rc))
757	{
758	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
759	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
760	VM_FF_SET(pVM, VM_FF_TERMINATE);
761	rc = VERR_INTERNAL_ERROR;
762	break;
763	}
764
765	}
766
767	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
768	return rc;
769	}
770
771
772	/**
773	* The global 1 halt method - VMR3NotifyFF() worker.
774	*
775	* @param pUVM Pointer to the user mode VM structure.
776	* @param fNotifiedREM See VMR3NotifyFF().
777	*/
778	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyFF(PUVM pUVM, bool fNotifiedREM)
779	{
780	if (pUVM->vm.s.fWait)
781	{
782	int rc = SUPCallVMMR0Ex(pUVM->pVM->pVMR0, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
783	AssertRC(rc);
784	}
785	else if (!fNotifiedREM)
786	REMR3NotifyFF(pUVM->pVM);
787	}
788
789
790	/**
791	* Bootstrap VMR3Wait() worker.
792	*
793	* @returns VBox status code.
794	* @param pUVM Pointer to the user mode VM structure.
795	*/
796	static DECLCALLBACK(int) vmR3BootstrapWait(PUVM pUVM)
797	{
798	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
799
800	int rc = VINF_SUCCESS;
801	for (;;)
802	{
803	/*
804	* Check Relevant FFs.
805	*/
806	if (pUVM->vm.s.pReqs)
807	break;
808	if ( pUVM->pVM
809	&& VM_FF_ISPENDING(pUVM->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
810	break;
811	if (pUVM->vm.s.fTerminateEMT)
812	break;
813
814	/*
815	* Wait for a while. Someone will wake us up or interrupt the call if
816	* anything needs our attention.
817	*/
818	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
819	if (rc == VERR_TIMEOUT)
820	rc = VINF_SUCCESS;
821	else if (VBOX_FAILURE(rc))
822	{
823	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
824	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
825	if (pUVM->pVM)
826	VM_FF_SET(pUVM->pVM, VM_FF_TERMINATE);
827	rc = VERR_INTERNAL_ERROR;
828	break;
829	}
830
831	}
832
833	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
834	return rc;
835	}
836
837
838	/**
839	* Bootstrap VMR3NotifyFF() worker.
840	*
841	* @param pUVM Pointer to the user mode VM structure.
842	* @param fNotifiedREM See VMR3NotifyFF().
843	*/
844	static DECLCALLBACK(void) vmR3BootstrapNotifyFF(PUVM pUVM, bool fNotifiedREM)
845	{
846	if (pUVM->vm.s.fWait)
847	{
848	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
849	AssertRC(rc);
850	}
851	}
852
853
854
855	/**
856	* Default VMR3Wait() worker.
857	*
858	* @returns VBox status code.
859	* @param pUVM Pointer to the user mode VM structure.
860	*/
861	static DECLCALLBACK(int) vmR3DefaultWait(PUVM pUVM)
862	{
863	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
864
865	PVM pVM = pUVM->pVM;
866	int rc = VINF_SUCCESS;
867	for (;;)
868	{
869	/*
870	* Check Relevant FFs.
871	*/
872	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
873	break;
874
875	/*
876	* Wait for a while. Someone will wake us up or interrupt the call if
877	* anything needs our attention.
878	*/
879	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
880	if (rc == VERR_TIMEOUT)
881	rc = VINF_SUCCESS;
882	else if (VBOX_FAILURE(rc))
883	{
884	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
885	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
886	VM_FF_SET(pVM, VM_FF_TERMINATE);
887	rc = VERR_INTERNAL_ERROR;
888	break;
889	}
890
891	}
892
893	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
894	return rc;
895	}
896
897
898	/**
899	* Default VMR3NotifyFF() worker.
900	*
901	* @param pUVM Pointer to the user mode VM structure.
902	* @param fNotifiedREM See VMR3NotifyFF().
903	*/
904	static DECLCALLBACK(void) vmR3DefaultNotifyFF(PUVM pUVM, bool fNotifiedREM)
905	{
906	if (pUVM->vm.s.fWait)
907	{
908	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
909	AssertRC(rc);
910	}
911	else if (!fNotifiedREM)
912	REMR3NotifyFF(pUVM->pVM);
913	}
914
915
916	/**
917	* Array with halt method descriptors.
918	* VMINT::iHaltMethod contains an index into this array.
919	*/
920	static const struct VMHALTMETHODDESC
921	{
922	/** The halt method id. */
923	VMHALTMETHOD enmHaltMethod;
924	/** The init function for loading config and initialize variables. */
925	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
926	/** The term function. */
927	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
928	/** The halt function. */
929	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVM pUVM, const uint32_t fMask, uint64_t u64Now));
930	/** The wait function. */
931	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVM pUVM));
932	/** The notifyFF function. */
933	DECLR3CALLBACKMEMBER(void, pfnNotifyFF,(PUVM pUVM, bool fNotifiedREM));
934	} g_aHaltMethods[] =
935	{
936	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyFF },
937	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
938	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyFF },
939	//{ VMHALTMETHOD_2, vmR3HaltMethod2Init, vmR3HaltMethod2Term, vmR3HaltMethod2DoHalt, vmR3HaltMethod2Wait, vmR3HaltMethod2NotifyFF },
940	{ VMHALTMETHOD_GLOBAL_1,vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyFF },
941	};
942
943
944	/**
945	* Notify the emulation thread (EMT) about pending Forced Action (FF).
946	*
947	* This function is called by thread other than EMT to make
948	* sure EMT wakes up and promptly service an FF request.
949	*
950	* @param pVM VM handle.
951	* @param fNotifiedREM Set if REM have already been notified. If clear the
952	* generic REMR3NotifyFF() method is called.
953	*/
954	VMR3DECL(void) VMR3NotifyFF(PVM pVM, bool fNotifiedREM)
955	{
956	LogFlow(("VMR3NotifyFF:\n"));
957	PUVM pUVM = pVM->pUVM;
958	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
959	}
960
961
962	/**
963	* Notify the emulation thread (EMT) about pending Forced Action (FF).
964	*
965	* This function is called by thread other than EMT to make
966	* sure EMT wakes up and promptly service an FF request.
967	*
968	* @param pUVM Pointer to the user mode VM structure.
969	* @param fNotifiedREM Set if REM have already been notified. If clear the
970	* generic REMR3NotifyFF() method is called.
971	*/
972	VMR3DECL(void) VMR3NotifyFFU(PUVM pUVM, bool fNotifiedREM)
973	{
974	LogFlow(("VMR3NotifyFF:\n"));
975	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
976	}
977
978
979	/**
980	* Halted VM Wait.
981	* Any external event will unblock the thread.
982	*
983	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
984	* case an appropriate status code is returned.
985	* @param pVM VM handle.
986	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
987	* @thread The emulation thread.
988	*/
989	VMR3DECL(int) VMR3WaitHalted(PVM pVM, bool fIgnoreInterrupts)
990	{
991	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
992
993	/*
994	* Check Relevant FFs.
995	*/
996	const uint32_t fMask = !fIgnoreInterrupts
997	? VM_FF_EXTERNAL_HALTED_MASK
998	: VM_FF_EXTERNAL_HALTED_MASK & ~(VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC);
999	if (VM_FF_ISPENDING(pVM, fMask))
1000	{
1001	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1002	return VINF_SUCCESS;
1003	}
1004
1005	/*
1006	* The yielder is suspended while we're halting, while TM might have clock(s) running
1007	* only at certain times and need to be notified..
1008	*/
1009	VMMR3YieldSuspend(pVM);
1010	TMNotifyStartOfHalt(pVM);
1011
1012	/*
1013	* Record halt averages for the last second.
1014	*/
1015	PUVM pUVM = pVM->pUVM;
1016	uint64_t u64Now = RTTimeNanoTS();
1017	int64_t off = u64Now - pUVM->vm.s.u64HaltsStartTS;
1018	if (off > 1000000000)
1019	{
1020	if (off > _4G \|\| !pUVM->vm.s.cHalts)
1021	{
1022	pUVM->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1023	pUVM->vm.s.HaltFrequency = 1;
1024	}
1025	else
1026	{
1027	pUVM->vm.s.HaltInterval = (uint32_t)off / pUVM->vm.s.cHalts;
1028	pUVM->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVM->vm.s.cHalts, 1000000000, (uint32_t)off);
1029	}
1030	pUVM->vm.s.u64HaltsStartTS = u64Now;
1031	pUVM->vm.s.cHalts = 0;
1032	}
1033	pUVM->vm.s.cHalts++;
1034
1035	/*
1036	* Do the halt.
1037	*/
1038	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVM, fMask, u64Now);
1039
1040	/*
1041	* Notify TM and resume the yielder
1042	*/
1043	TMNotifyEndOfHalt(pVM);
1044	VMMR3YieldResume(pVM);
1045
1046	LogFlow(("VMR3WaitHalted: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
1047	return rc;
1048	}
1049
1050
1051	/**
1052	* Suspended VM Wait.
1053	* Only a handful of forced actions will cause the function to
1054	* return to the caller.
1055	*
1056	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1057	* case an appropriate status code is returned.
1058	* @param pUVM Pointer to the user mode VM structure.
1059	* @thread The emulation thread.
1060	*/
1061	VMR3DECL(int) VMR3WaitU(PUVM pUVM)
1062	{
1063	LogFlow(("VMR3WaitU:\n"));
1064
1065	/*
1066	* Check Relevant FFs.
1067	*/
1068	PVM pVM = pUVM->pVM;
1069	if ( pVM
1070	&& VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
1071	{
1072	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1073	return VINF_SUCCESS;
1074	}
1075
1076	/*
1077	* Do waiting according to the halt method (so VMR3NotifyFF
1078	* doesn't have to special case anything).
1079	*/
1080	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVM);
1081	LogFlow(("VMR3WaitU: returns %Vrc (FF %#x)\n", rc, pVM ? pVM->fForcedActions : 0));
1082	return rc;
1083	}
1084
1085
1086	/**
1087	* Changes the halt method.
1088	*
1089	* @returns VBox status code.
1090	* @param pUVM Pointer to the user mode VM structure.
1091	* @param enmHaltMethod The new halt method.
1092	* @thread EMT.
1093	*/
1094	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1095	{
1096	PVM pVM = pUVM->pVM; Assert(pVM);
1097	VM_ASSERT_EMT(pVM);
1098	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1099
1100	/*
1101	* Resolve default (can be overridden in the configuration).
1102	*/
1103	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1104	{
1105	uint32_t u32;
1106	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1107	if (VBOX_SUCCESS(rc))
1108	{
1109	enmHaltMethod = (VMHALTMETHOD)u32;
1110	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1111	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1112	}
1113	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1114	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1115	else
1116	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1117	//enmHaltMethod = VMHALTMETHOD_1;
1118	//enmHaltMethod = VMHALTMETHOD_OLD;
1119	}
1120	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1121
1122	/*
1123	* Find the descriptor.
1124	*/
1125	unsigned i = 0;
1126	while ( i < RT_ELEMENTS(g_aHaltMethods)
1127	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1128	i++;
1129	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1130
1131	/*
1132	* Terminate the old one.
1133	*/
1134	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1135	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1136	{
1137	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1138	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1139	}
1140
1141	/*
1142	* Init the new one.
1143	*/
1144	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1145	if (g_aHaltMethods[i].pfnInit)
1146	{
1147	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1148	AssertRCReturn(rc, rc);
1149	}
1150	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1151
1152	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1153	return VINF_SUCCESS;
1154	}
1155

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 12986

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