VMEmt.cpp@ 7796

Last change on this file since 7796 was 6804, checked in by vboxsync, 17 years ago

Fixed VMR3PowerOn regression.

The problem was that the EMT outer loop wasn't checking for state
changes in the init case (pUVM->pVM == NULL). So, if the VMR3PowerOn
request was queued and executed by the initial VMR3ReqProcessU call
we wouldn't call EMR3ExecuteVM when the VM state changed to running.

Property svn:eol-style set to native
Property svn:keywords set to Id

File size: 37.1 KB

Line
1	/* $Id: VMEmt.cpp 6804 2008-02-05 10:27:19Z 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 (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
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VM
23	#include <VBox/tm.h>
24	#include <VBox/dbgf.h>
25	#include <VBox/em.h>
26	#include <VBox/pdmapi.h>
27	#include <VBox/rem.h>
28	#include "VMInternal.h"
29	#include <VBox/vm.h>
30	#include <VBox/uvm.h>
31
32	#include <VBox/err.h>
33	#include <VBox/log.h>
34	#include <iprt/assert.h>
35	#include <iprt/asm.h>
36	#include <iprt/semaphore.h>
37	#include <iprt/string.h>
38	#include <iprt/thread.h>
39	#include <iprt/time.h>
40
41
42
43
44	/**
45	* The emulation thread.
46	*
47	* @returns Thread exit code.
48	* @param ThreadSelf The handle to the executing thread.
49	* @param pvArgs Pointer to the user mode VM structure (UVM).
50	*/
51	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
52	{
53	PUVM pUVM = (PUVM)pvArgs;
54	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
55	("Invalid arguments to the emulation thread!\n"));
56
57	/*
58	* Init the native thread member.
59	*/
60	pUVM->vm.s.NativeThreadEMT = RTThreadGetNative(ThreadSelf);
61
62	/*
63	* The request loop.
64	*/
65	int rc = VINF_SUCCESS;
66	VMSTATE enmBefore = VMSTATE_CREATING;
67	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
68	for (;;)
69	{
70	/* Requested to exit the EMT thread out of sync? (currently only VMR3WaitForResume) */
71	if (setjmp(pUVM->vm.s.emtJumpEnv) != 0)
72	{
73	rc = VINF_SUCCESS;
74	break;
75	}
76
77	/*
78	* During early init there is no pVM, so make a special path
79	* for that to keep things clearly separate.
80	*/
81	if (!pUVM->pVM)
82	{
83	/*
84	* Check for termination first.
85	*/
86	if (pUVM->vm.s.fTerminateEMT)
87	{
88	rc = VINF_EM_TERMINATE;
89	break;
90	}
91	if (pUVM->vm.s.pReqs)
92	{
93	/*
94	* Service execute in EMT request.
95	*/
96	rc = VMR3ReqProcessU(pUVM);
97	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
98	}
99	else
100	{
101	/*
102	* Nothing important is pending, so wait for something.
103	*/
104	rc = VMR3WaitU(pUVM);
105	if (VBOX_FAILURE(rc))
106	break;
107	}
108	}
109	else
110	{
111
112	/*
113	* Pending requests which needs servicing?
114	*
115	* We check for state changes in addition to status codes when
116	* servicing requests. (Look after the ifs.)
117	*/
118	PVM pVM = pUVM->pVM;
119	enmBefore = pVM->enmVMState;
120	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
121	\|\| pUVM->vm.s.fTerminateEMT)
122	{
123	rc = VINF_EM_TERMINATE;
124	break;
125	}
126	if (pUVM->vm.s.pReqs)
127	{
128	/*
129	* Service execute in EMT request.
130	*/
131	rc = VMR3ReqProcessU(pUVM);
132	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
133	}
134	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
135	{
136	/*
137	* Service the debugger request.
138	*/
139	rc = DBGFR3VMMForcedAction(pVM);
140	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
141	}
142	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
143	{
144	/*
145	* Service a delayed reset request.
146	*/
147	rc = VMR3Reset(pVM);
148	VM_FF_CLEAR(pVM, VM_FF_RESET);
149	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
150	}
151	else
152	{
153	/*
154	* Nothing important is pending, so wait for something.
155	*/
156	rc = VMR3WaitU(pUVM);
157	if (VBOX_FAILURE(rc))
158	break;
159	}
160
161	/*
162	* Check for termination requests, these have extremely high priority.
163	*/
164	if ( rc == VINF_EM_TERMINATE
165	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
166	\|\| pUVM->vm.s.fTerminateEMT)
167	break;
168	}
169
170	/*
171	* Some requests (both VMR3Req* and the DBGF) can potentially
172	* resume or start the VM, in that case we'll get a change in
173	* VM status indicating that we're now running.
174	*/
175	if ( VBOX_SUCCESS(rc)
176	&& pUVM->pVM
177	&& enmBefore != pUVM->pVM->enmVMState
178	&& pUVM->pVM->enmVMState == VMSTATE_RUNNING)
179	{
180	PVM pVM = pUVM->pVM;
181	rc = EMR3ExecuteVM(pVM);
182	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Vrc, enmVMState=%d\n", rc, pVM->enmVMState));
183	if (EMGetState(pVM) == EMSTATE_GURU_MEDITATION)
184	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
185	}
186
187	} /* forever */
188
189
190	/*
191	* Exiting.
192	*/
193	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Vrc enmBefore=%d enmVMState=%d\n",
194	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
195	if (pUVM->vm.s.fEMTDoesTheCleanup)
196	{
197	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
198	Assert(pUVM->pVM);
199	vmR3Destroy(pUVM->pVM);
200	vmR3DestroyFinalBitFromEMT(pUVM);
201	}
202	else
203	{
204	vmR3DestroyFinalBitFromEMT(pUVM);
205
206	/* we don't reset ThreadEMT here because it's used in waiting. */
207	pUVM->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
208	}
209	Log(("vmR3EmulationThread: EMT is terminated.\n"));
210	return rc;
211	}
212
213
214	/**
215	* Wait for VM to be resumed. Handle events like vmR3EmulationThread does.
216	* In case the VM is stopped, clean up and long jump to the main EMT loop.
217	*
218	* @returns VINF_SUCCESS or doesn't return
219	* @param pVM VM handle.
220	*/
221	VMR3DECL(int) VMR3WaitForResume(PVM pVM)
222	{
223	/*
224	* The request loop.
225	*/
226	PUVM pUVM = pVM->pUVM;
227	VMSTATE enmBefore;
228	int rc;
229	for (;;)
230	{
231
232	/*
233	* Pending requests which needs servicing?
234	*
235	* We check for state changes in addition to status codes when
236	* servicing requests. (Look after the ifs.)
237	*/
238	enmBefore = pVM->enmVMState;
239	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
240	\|\| pUVM->vm.s.fTerminateEMT)
241	{
242	rc = VINF_EM_TERMINATE;
243	break;
244	}
245	else if (pUVM->vm.s.pReqs)
246	{
247	/*
248	* Service execute in EMT request.
249	*/
250	rc = VMR3ReqProcessU(pUVM);
251	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
252	}
253	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
254	{
255	/*
256	* Service the debugger request.
257	*/
258	rc = DBGFR3VMMForcedAction(pVM);
259	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
260	}
261	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
262	{
263	/*
264	* Service a delay reset request.
265	*/
266	rc = VMR3Reset(pVM);
267	VM_FF_CLEAR(pVM, VM_FF_RESET);
268	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
269	}
270	else
271	{
272	/*
273	* Nothing important is pending, so wait for something.
274	*/
275	rc = VMR3WaitU(pUVM);
276	if (VBOX_FAILURE(rc))
277	break;
278	}
279
280	/*
281	* Check for termination requests, these are extremely high priority.
282	*/
283	if ( rc == VINF_EM_TERMINATE
284	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
285	\|\| pUVM->vm.s.fTerminateEMT)
286	break;
287
288	/*
289	* Some requests (both VMR3Req* and the DBGF) can potentially
290	* resume or start the VM, in that case we'll get a change in
291	* VM status indicating that we're now running.
292	*/
293	if ( VBOX_SUCCESS(rc)
294	&& enmBefore != pVM->enmVMState
295	&& pVM->enmVMState == VMSTATE_RUNNING)
296	{
297	/* Only valid exit reason. */
298	return VINF_SUCCESS;
299	}
300
301	} /* forever */
302
303	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
304	longjmp(pUVM->vm.s.emtJumpEnv, 1);
305	}
306
307
308	/**
309	* Gets the name of a halt method.
310	*
311	* @returns Pointer to a read only string.
312	* @param enmMethod The method.
313	*/
314	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
315	{
316	switch (enmMethod)
317	{
318	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
319	case VMHALTMETHOD_DEFAULT: return "default";
320	case VMHALTMETHOD_OLD: return "old";
321	case VMHALTMETHOD_1: return "method1";
322	//case VMHALTMETHOD_2: return "method2";
323	case VMHALTMETHOD_GLOBAL_1: return "global1";
324	default: return "unknown";
325	}
326	}
327
328
329	/**
330	* The old halt loop.
331	*
332	* @param pUVM Pointer to the user mode VM structure.
333	*/
334	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVM pUVM, const uint32_t fMask, uint64_t /* u64Now*/)
335	{
336	/*
337	* Halt loop.
338	*/
339	PVM pVM = pUVM->pVM;
340	int rc = VINF_SUCCESS;
341	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
342	//unsigned cLoops = 0;
343	for (;;)
344	{
345	/*
346	* Work the timers and check if we can exit.
347	* The poll call gives us the ticks left to the next event in
348	* addition to perhaps set an FF.
349	*/
350	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
351	PDMR3Poll(pVM);
352	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
353	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
354	TMR3TimerQueuesDo(pVM);
355	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
356	if (VM_FF_ISPENDING(pVM, fMask))
357	break;
358	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
359	if (VM_FF_ISPENDING(pVM, fMask))
360	break;
361
362	/*
363	* Wait for a while. Someone will wake us up or interrupt the call if
364	* anything needs our attention.
365	*/
366	if (u64NanoTS < 50000)
367	{
368	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
369	/* spin */;
370	}
371	else
372	{
373	VMMR3YieldStop(pVM);
374	//uint64_t u64Start = RTTimeNanoTS();
375	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
376	{
377	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
378	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, a);
379	RTThreadYield(); /* this is the best we can do here */
380	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, a);
381	}
382	else if (u64NanoTS < 2000000)
383	{
384	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
385	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
386	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1);
387	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
388	}
389	else
390	{
391	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
392	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
393	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
394	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
395	}
396	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
397	//RTLogPrintf(" -> rc=%Vrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
398	}
399	if (rc == VERR_TIMEOUT)
400	rc = VINF_SUCCESS;
401	else if (VBOX_FAILURE(rc))
402	{
403	AssertRC(rc != VERR_INTERRUPTED);
404	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
405	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
406	VM_FF_SET(pVM, VM_FF_TERMINATE);
407	rc = VERR_INTERNAL_ERROR;
408	break;
409	}
410	}
411
412	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
413	return rc;
414	}
415
416
417	/**
418	* Initialize the configuration of halt method 1 & 2.
419	*
420	* @return VBox status code. Failure on invalid CFGM data.
421	* @param pVM The VM handle.
422	*/
423	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
424	{
425	/*
426	* The defaults.
427	*/
428	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
429	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
430	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
431	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
432	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
433	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
434	#else
435	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
436	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
437	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
438	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
439	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
440	#endif
441
442	/*
443	* Query overrides.
444	*
445	* I don't have time to bother with niceities such as invalid value checks
446	* here right now. sorry.
447	*/
448	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
449	if (pCfg)
450	{
451	uint32_t u32;
452	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
453	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
454	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
455	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
456	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
457	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
458	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
459	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
460	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
461	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
462	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
463	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
464	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
465	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
466	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
467	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
468	}
469
470	return VINF_SUCCESS;
471	}
472
473
474	/**
475	* Initialize halt method 1.
476	*
477	* @return VBox status code.
478	* @param pUVM Pointer to the user mode VM structure.
479	*/
480	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
481	{
482	return vmR3HaltMethod12ReadConfigU(pUVM);
483	}
484
485
486	/**
487	* Method 1 - Block whenever possible, and when lagging behind
488	* switch to spinning for 10-30ms with occational blocking until
489	* the lag has been eliminated.
490	*/
491	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
492	{
493	PVM pVM = pUVM->pVM;
494
495	/*
496	* To simplify things, we decide up-front whether we should switch to spinning or
497	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
498	* and that it will generate interrupts or other events that will cause us to exit
499	* the halt loop.
500	*/
501	bool fBlockOnce = false;
502	bool fSpinning = false;
503	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
504	if (u32CatchUpPct /* non-zero if catching up */)
505	{
506	if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
507	{
508	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
509	if (fSpinning)
510	{
511	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
512	fBlockOnce = u64Now - pUVM->vm.s.Halt.Method12.u64LastBlockTS
513	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
514	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
515	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
516	}
517	else
518	{
519	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
520	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
521	}
522	}
523	else
524	{
525	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
526	if (fSpinning)
527	pUVM->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
528	}
529	}
530	else if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
531	{
532	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
533	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
534	}
535
536	/*
537	* Halt loop.
538	*/
539	int rc = VINF_SUCCESS;
540	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
541	unsigned cLoops = 0;
542	for (;; cLoops++)
543	{
544	/*
545	* Work the timers and check if we can exit.
546	*/
547	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
548	PDMR3Poll(pVM);
549	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
550	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
551	TMR3TimerQueuesDo(pVM);
552	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
553	if (VM_FF_ISPENDING(pVM, fMask))
554	break;
555
556	/*
557	* Estimate time left to the next event.
558	*/
559	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
560	if (VM_FF_ISPENDING(pVM, fMask))
561	break;
562
563	/*
564	* Block if we're not spinning and the interval isn't all that small.
565	*/
566	if ( ( !fSpinning
567	\|\| fBlockOnce)
568	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
569	&& u64NanoTS >= 100000) /* 0.100 ms */
570	#else
571	&& u64NanoTS >= 250000) /* 0.250 ms */
572	#endif
573	{
574	const uint64_t Start = pUVM->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
575	VMMR3YieldStop(pVM);
576
577	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
578	if (cMilliSecs <= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
579	cMilliSecs = 1;
580	else
581	cMilliSecs -= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
582	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
583	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
584	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, cMilliSecs);
585	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
586	if (rc == VERR_TIMEOUT)
587	rc = VINF_SUCCESS;
588	else if (VBOX_FAILURE(rc))
589	{
590	AssertRC(rc != VERR_INTERRUPTED);
591	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
592	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
593	VM_FF_SET(pVM, VM_FF_TERMINATE);
594	rc = VERR_INTERNAL_ERROR;
595	break;
596	}
597
598	/*
599	* Calc the statistics.
600	* Update averages every 16th time, and flush parts of the history every 64th time.
601	*/
602	const uint64_t Elapsed = RTTimeNanoTS() - Start;
603	pUVM->vm.s.Halt.Method12.cNSBlocked += Elapsed;
604	if (Elapsed > u64NanoTS)
605	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
606	pUVM->vm.s.Halt.Method12.cBlocks++;
607	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0xf))
608	{
609	pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVM->vm.s.Halt.Method12.cNSBlockedTooLong / pUVM->vm.s.Halt.Method12.cBlocks;
610	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0x3f))
611	{
612	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong = pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
613	pUVM->vm.s.Halt.Method12.cBlocks = 0x40;
614	}
615	}
616	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
617
618	/*
619	* Clear the block once flag if we actually blocked.
620	*/
621	if ( fBlockOnce
622	&& Elapsed > 100000 /* 0.1 ms */)
623	fBlockOnce = false;
624	}
625	}
626	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
627
628	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
629	return rc;
630	}
631
632
633	/**
634	* Initialize the global 1 halt method.
635	*
636	* @return VBox status code.
637	* @param pUVM Pointer to the user mode VM structure.
638	*/
639	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
640	{
641	return VINF_SUCCESS;
642	}
643
644
645	/**
646	* The global 1 halt method - Block in GMM (ring-0) and let it
647	* try take care of the global scheduling of EMT threads.
648	*/
649	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
650	{
651	PVM pVM = pUVM->pVM;
652
653	/*
654	* Halt loop.
655	*/
656	int rc = VINF_SUCCESS;
657	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
658	unsigned cLoops = 0;
659	for (;; cLoops++)
660	{
661	/*
662	* Work the timers and check if we can exit.
663	*/
664	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
665	PDMR3Poll(pVM);
666	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
667	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
668	TMR3TimerQueuesDo(pVM);
669	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
670	if (VM_FF_ISPENDING(pVM, fMask))
671	break;
672
673	/*
674	* Estimate time left to the next event.
675	*/
676	uint64_t u64Delta;
677	uint64_t u64GipTime = TMTimerPollGIP(pVM, &u64Delta);
678	if (VM_FF_ISPENDING(pVM, fMask))
679	break;
680
681	/*
682	* Block if we're not spinning and the interval isn't all that small.
683	*/
684	if (u64Delta > 50000 /* 0.050ms */)
685	{
686	VMMR3YieldStop(pVM);
687	if (VM_FF_ISPENDING(pVM, fMask))
688	break;
689
690	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
691	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, c);
692	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
693	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, c);
694	if (rc == VERR_INTERRUPTED)
695	rc = VINF_SUCCESS;
696	else if (VBOX_FAILURE(rc))
697	{
698	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Vrc\n", rc));
699	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
700	VM_FF_SET(pVM, VM_FF_TERMINATE);
701	rc = VERR_INTERNAL_ERROR;
702	break;
703	}
704	}
705	/*
706	* When spinning call upon the GVMM and do some wakups once
707	* in a while, it's not like we're actually busy or anything.
708	*/
709	else if (!(cLoops & 0x1fff))
710	{
711	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, d);
712	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
713	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, d);
714	}
715	}
716	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
717
718	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
719	return rc;
720	}
721
722
723	/**
724	* The global 1 halt method - VMR3Wait() worker.
725	*
726	* @returns VBox status code.
727	* @param pUVM Pointer to the user mode VM structure.
728	*/
729	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVM pUVM)
730	{
731	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
732
733	PVM pVM = pUVM->pVM;
734	int rc = VINF_SUCCESS;
735	for (;;)
736	{
737	/*
738	* Check Relevant FFs.
739	*/
740	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
741	break;
742
743	/*
744	* Wait for a while. Someone will wake us up or interrupt the call if
745	* anything needs our attention.
746	*/
747	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
748	if (rc == VERR_INTERRUPTED)
749	rc = VINF_SUCCESS;
750	else if (VBOX_FAILURE(rc))
751	{
752	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
753	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
754	VM_FF_SET(pVM, VM_FF_TERMINATE);
755	rc = VERR_INTERNAL_ERROR;
756	break;
757	}
758
759	}
760
761	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
762	return rc;
763	}
764
765
766	/**
767	* The global 1 halt method - VMR3NotifyFF() worker.
768	*
769	* @param pUVM Pointer to the user mode VM structure.
770	* @param fNotifiedREM See VMR3NotifyFF().
771	*/
772	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyFF(PUVM pUVM, bool fNotifiedREM)
773	{
774	if (pUVM->vm.s.fWait)
775	{
776	int rc = SUPCallVMMR0Ex(pUVM->pVM->pVMR0, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
777	AssertRC(rc);
778	}
779	else if (!fNotifiedREM)
780	REMR3NotifyFF(pUVM->pVM);
781	}
782
783
784	/**
785	* Bootstrap VMR3Wait() worker.
786	*
787	* @returns VBox status code.
788	* @param pUVM Pointer to the user mode VM structure.
789	*/
790	static DECLCALLBACK(int) vmR3BootstrapWait(PUVM pUVM)
791	{
792	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
793
794	int rc = VINF_SUCCESS;
795	for (;;)
796	{
797	/*
798	* Check Relevant FFs.
799	*/
800	if (pUVM->vm.s.pReqs)
801	break;
802	if ( pUVM->pVM
803	&& VM_FF_ISPENDING(pUVM->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
804	break;
805	if (pUVM->vm.s.fTerminateEMT)
806	break;
807
808	/*
809	* Wait for a while. Someone will wake us up or interrupt the call if
810	* anything needs our attention.
811	*/
812	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
813	if (rc == VERR_TIMEOUT)
814	rc = VINF_SUCCESS;
815	else if (VBOX_FAILURE(rc))
816	{
817	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
818	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
819	if (pUVM->pVM)
820	VM_FF_SET(pUVM->pVM, VM_FF_TERMINATE);
821	rc = VERR_INTERNAL_ERROR;
822	break;
823	}
824
825	}
826
827	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
828	return rc;
829	}
830
831
832	/**
833	* Bootstrap VMR3NotifyFF() worker.
834	*
835	* @param pUVM Pointer to the user mode VM structure.
836	* @param fNotifiedREM See VMR3NotifyFF().
837	*/
838	static DECLCALLBACK(void) vmR3BootstrapNotifyFF(PUVM pUVM, bool fNotifiedREM)
839	{
840	if (pUVM->vm.s.fWait)
841	{
842	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
843	AssertRC(rc);
844	}
845	}
846
847
848
849	/**
850	* Default VMR3Wait() worker.
851	*
852	* @returns VBox status code.
853	* @param pUVM Pointer to the user mode VM structure.
854	*/
855	static DECLCALLBACK(int) vmR3DefaultWait(PUVM pUVM)
856	{
857	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
858
859	PVM pVM = pUVM->pVM;
860	int rc = VINF_SUCCESS;
861	for (;;)
862	{
863	/*
864	* Check Relevant FFs.
865	*/
866	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
867	break;
868
869	/*
870	* Wait for a while. Someone will wake us up or interrupt the call if
871	* anything needs our attention.
872	*/
873	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
874	if (rc == VERR_TIMEOUT)
875	rc = VINF_SUCCESS;
876	else if (VBOX_FAILURE(rc))
877	{
878	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
879	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
880	VM_FF_SET(pVM, VM_FF_TERMINATE);
881	rc = VERR_INTERNAL_ERROR;
882	break;
883	}
884
885	}
886
887	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
888	return rc;
889	}
890
891
892	/**
893	* Default VMR3NotifyFF() worker.
894	*
895	* @param pUVM Pointer to the user mode VM structure.
896	* @param fNotifiedREM See VMR3NotifyFF().
897	*/
898	static DECLCALLBACK(void) vmR3DefaultNotifyFF(PUVM pUVM, bool fNotifiedREM)
899	{
900	if (pUVM->vm.s.fWait)
901	{
902	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
903	AssertRC(rc);
904	}
905	else if (!fNotifiedREM)
906	REMR3NotifyFF(pUVM->pVM);
907	}
908
909
910	/**
911	* Array with halt method descriptors.
912	* VMINT::iHaltMethod contains an index into this array.
913	*/
914	static const struct VMHALTMETHODDESC
915	{
916	/** The halt method id. */
917	VMHALTMETHOD enmHaltMethod;
918	/** The init function for loading config and initialize variables. */
919	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
920	/** The term function. */
921	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
922	/** The halt function. */
923	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVM pUVM, const uint32_t fMask, uint64_t u64Now));
924	/** The wait function. */
925	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVM pUVM));
926	/** The notifyFF function. */
927	DECLR3CALLBACKMEMBER(void, pfnNotifyFF,(PUVM pUVM, bool fNotifiedREM));
928	} g_aHaltMethods[] =
929	{
930	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyFF },
931	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
932	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyFF },
933	//{ VMHALTMETHOD_2, vmR3HaltMethod2Init, vmR3HaltMethod2Term, vmR3HaltMethod2DoHalt, vmR3HaltMethod2Wait, vmR3HaltMethod2NotifyFF },
934	{ VMHALTMETHOD_GLOBAL_1,vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyFF },
935	};
936
937
938	/**
939	* Notify the emulation thread (EMT) about pending Forced Action (FF).
940	*
941	* This function is called by thread other than EMT to make
942	* sure EMT wakes up and promptly service an FF request.
943	*
944	* @param pVM VM handle.
945	* @param fNotifiedREM Set if REM have already been notified. If clear the
946	* generic REMR3NotifyFF() method is called.
947	*/
948	VMR3DECL(void) VMR3NotifyFF(PVM pVM, bool fNotifiedREM)
949	{
950	LogFlow(("VMR3NotifyFF:\n"));
951	PUVM pUVM = pVM->pUVM;
952	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
953	}
954
955
956	/**
957	* Notify the emulation thread (EMT) about pending Forced Action (FF).
958	*
959	* This function is called by thread other than EMT to make
960	* sure EMT wakes up and promptly service an FF request.
961	*
962	* @param pUVM Pointer to the user mode VM structure.
963	* @param fNotifiedREM Set if REM have already been notified. If clear the
964	* generic REMR3NotifyFF() method is called.
965	*/
966	VMR3DECL(void) VMR3NotifyFFU(PUVM pUVM, bool fNotifiedREM)
967	{
968	LogFlow(("VMR3NotifyFF:\n"));
969	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
970	}
971
972
973	/**
974	* Halted VM Wait.
975	* Any external event will unblock the thread.
976	*
977	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
978	* case an appropriate status code is returned.
979	* @param pVM VM handle.
980	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
981	* @thread The emulation thread.
982	*/
983	VMR3DECL(int) VMR3WaitHalted(PVM pVM, bool fIgnoreInterrupts)
984	{
985	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
986
987	/*
988	* Check Relevant FFs.
989	*/
990	const uint32_t fMask = !fIgnoreInterrupts
991	? VM_FF_EXTERNAL_HALTED_MASK
992	: VM_FF_EXTERNAL_HALTED_MASK & ~(VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC);
993	if (VM_FF_ISPENDING(pVM, fMask))
994	{
995	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
996	return VINF_SUCCESS;
997	}
998
999	/*
1000	* The yielder is suspended while we're halting.
1001	*/
1002	VMMR3YieldSuspend(pVM);
1003
1004	/*
1005	* Record halt averages for the last second.
1006	*/
1007	PUVM pUVM = pVM->pUVM;
1008	uint64_t u64Now = RTTimeNanoTS();
1009	int64_t off = u64Now - pUVM->vm.s.u64HaltsStartTS;
1010	if (off > 1000000000)
1011	{
1012	if (off > _4G \|\| !pUVM->vm.s.cHalts)
1013	{
1014	pUVM->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1015	pUVM->vm.s.HaltFrequency = 1;
1016	}
1017	else
1018	{
1019	pUVM->vm.s.HaltInterval = (uint32_t)off / pUVM->vm.s.cHalts;
1020	pUVM->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVM->vm.s.cHalts, 1000000000, (uint32_t)off);
1021	}
1022	pUVM->vm.s.u64HaltsStartTS = u64Now;
1023	pUVM->vm.s.cHalts = 0;
1024	}
1025	pUVM->vm.s.cHalts++;
1026
1027	/*
1028	* Do the halt.
1029	*/
1030	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVM, fMask, u64Now);
1031
1032	/*
1033	* Resume the yielder.
1034	*/
1035	VMMR3YieldResume(pVM);
1036
1037	LogFlow(("VMR3WaitHalted: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
1038	return rc;
1039	}
1040
1041
1042	/**
1043	* Suspended VM Wait.
1044	* Only a handful of forced actions will cause the function to
1045	* return to the caller.
1046	*
1047	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1048	* case an appropriate status code is returned.
1049	* @param pUVM Pointer to the user mode VM structure.
1050	* @thread The emulation thread.
1051	*/
1052	VMR3DECL(int) VMR3WaitU(PUVM pUVM)
1053	{
1054	LogFlow(("VMR3WaitU:\n"));
1055
1056	/*
1057	* Check Relevant FFs.
1058	*/
1059	PVM pVM = pUVM->pVM;
1060	if ( pVM
1061	&& VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
1062	{
1063	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1064	return VINF_SUCCESS;
1065	}
1066
1067	/*
1068	* Do waiting according to the halt method (so VMR3NotifyFF
1069	* doesn't have to special case anything).
1070	*/
1071	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVM);
1072	LogFlow(("VMR3WaitU: returns %Vrc (FF %#x)\n", rc, pVM ? pVM->fForcedActions : 0));
1073	return rc;
1074	}
1075
1076
1077	/**
1078	* Changes the halt method.
1079	*
1080	* @returns VBox status code.
1081	* @param pUVM Pointer to the user mode VM structure.
1082	* @param enmHaltMethod The new halt method.
1083	* @thread EMT.
1084	*/
1085	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1086	{
1087	PVM pVM = pUVM->pVM; Assert(pVM);
1088	VM_ASSERT_EMT(pVM);
1089	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1090
1091	/*
1092	* Resolve default (can be overridden in the configuration).
1093	*/
1094	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1095	{
1096	uint32_t u32;
1097	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1098	if (VBOX_SUCCESS(rc))
1099	{
1100	enmHaltMethod = (VMHALTMETHOD)u32;
1101	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1102	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1103	}
1104	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1105	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1106	else
1107	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1108	//enmHaltMethod = VMHALTMETHOD_1;
1109	//enmHaltMethod = VMHALTMETHOD_OLD;
1110	}
1111	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1112
1113	/*
1114	* Find the descriptor.
1115	*/
1116	unsigned i = 0;
1117	while ( i < RT_ELEMENTS(g_aHaltMethods)
1118	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1119	i++;
1120	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1121
1122	/*
1123	* Terminate the old one.
1124	*/
1125	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1126	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1127	{
1128	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1129	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1130	}
1131
1132	/*
1133	* Init the new one.
1134	*/
1135	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1136	if (g_aHaltMethods[i].pfnInit)
1137	{
1138	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1139	AssertRCReturn(rc, rc);
1140	}
1141	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1142
1143	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1144	return VINF_SUCCESS;
1145	}
1146

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 7796

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