VMEmt.cpp@ 13791

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1	/* $Id: VMEmt.cpp 13791 2008-11-04 16:12:57Z 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	* The emulation thread.
49	*
50	* @returns Thread exit code.
51	* @param ThreadSelf The handle to the executing thread.
52	* @param pvArgs Pointer to the user mode VM structure (UVM).
53	*/
54	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
55	{
56	PUVMCPU pUVMCPU = (PUVMCPU)pvArgs;
57	PUVM pUVM = pUVMCPU->pUVM;
58	RTCPUID idCPU = pUVMCPU->idCPU;
59	int rc = VINF_SUCCESS;
60
61	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
62	("Invalid arguments to the emulation thread!\n"));
63
64	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVMCPU);
65	AssertReleaseMsgReturn(RT_SUCCESS(rc), ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
66
67	/*
68	* The request loop.
69	*/
70	volatile VMSTATE enmBefore = VMSTATE_CREATING; /* volatile because of setjmp */
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(pUVMCPU->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, VMREQDEST_ANY);
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, VMREQDEST_ANY);
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	&& pVM->enmVMState == VMSTATE_RUNNING)
189	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
190	}
191
192	} /* forever */
193
194
195	/*
196	* Exiting.
197	*/
198	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Vrc enmBefore=%d enmVMState=%d\n",
199	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
200	if (pUVM->vm.s.fEMTDoesTheCleanup)
201	{
202	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
203	Assert(pUVM->pVM);
204	vmR3Destroy(pUVM->pVM);
205	vmR3DestroyFinalBitFromEMT(pUVM);
206	}
207	else
208	{
209	vmR3DestroyFinalBitFromEMT(pUVM);
210
211	pUVMCPU->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	VMMR3DECL(int) VMR3WaitForResume(PVM pVM)
226	{
227	/*
228	* The request loop.
229	*/
230	PUVMCPU pUVMCPU;
231	PUVM pUVM = pVM->pUVM;
232	VMSTATE enmBefore;
233	int rc;
234
235	pUVMCPU = (PUVMCPU)RTTlsGet(pUVM->vm.s.idxTLS);
236	AssertReturn(pUVMCPU, VERR_INTERNAL_ERROR);
237
238	for (;;)
239	{
240
241	/*
242	* Pending requests which needs servicing?
243	*
244	* We check for state changes in addition to status codes when
245	* servicing requests. (Look after the ifs.)
246	*/
247	enmBefore = pVM->enmVMState;
248	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
249	\|\| pUVM->vm.s.fTerminateEMT)
250	{
251	rc = VINF_EM_TERMINATE;
252	break;
253	}
254	else if (pUVM->vm.s.pReqs)
255	{
256	/*
257	* Service execute in EMT request.
258	*/
259	rc = VMR3ReqProcessU(pUVM, VMREQDEST_ANY);
260	Log(("vmR3EmulationThread: Req rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
261	}
262	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
263	{
264	/*
265	* Service the debugger request.
266	*/
267	rc = DBGFR3VMMForcedAction(pVM);
268	Log(("vmR3EmulationThread: Dbg rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
269	}
270	else if (VM_FF_ISSET(pVM, VM_FF_RESET))
271	{
272	/*
273	* Service a delay reset request.
274	*/
275	rc = VMR3Reset(pVM);
276	VM_FF_CLEAR(pVM, VM_FF_RESET);
277	Log(("vmR3EmulationThread: Reset rc=%Vrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
278	}
279	else
280	{
281	/*
282	* Nothing important is pending, so wait for something.
283	*/
284	rc = VMR3WaitU(pUVM);
285	if (VBOX_FAILURE(rc))
286	break;
287	}
288
289	/*
290	* Check for termination requests, these are extremely high priority.
291	*/
292	if ( rc == VINF_EM_TERMINATE
293	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
294	\|\| pUVM->vm.s.fTerminateEMT)
295	break;
296
297	/*
298	* Some requests (both VMR3Req* and the DBGF) can potentially
299	* resume or start the VM, in that case we'll get a change in
300	* VM status indicating that we're now running.
301	*/
302	if ( VBOX_SUCCESS(rc)
303	&& enmBefore != pVM->enmVMState
304	&& pVM->enmVMState == VMSTATE_RUNNING)
305	{
306	/* Only valid exit reason. */
307	return VINF_SUCCESS;
308	}
309
310	} /* forever */
311
312	/* Return to the main loop in vmR3EmulationThread, which will clean up for us. */
313	longjmp(pUVMCPU->vm.s.emtJumpEnv, 1);
314	}
315
316
317	/**
318	* Gets the name of a halt method.
319	*
320	* @returns Pointer to a read only string.
321	* @param enmMethod The method.
322	*/
323	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
324	{
325	switch (enmMethod)
326	{
327	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
328	case VMHALTMETHOD_DEFAULT: return "default";
329	case VMHALTMETHOD_OLD: return "old";
330	case VMHALTMETHOD_1: return "method1";
331	//case VMHALTMETHOD_2: return "method2";
332	case VMHALTMETHOD_GLOBAL_1: return "global1";
333	default: return "unknown";
334	}
335	}
336
337
338	/**
339	* The old halt loop.
340	*
341	* @param pUVM Pointer to the user mode VM structure.
342	*/
343	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVM pUVM, const uint32_t fMask, uint64_t /* u64Now*/)
344	{
345	/*
346	* Halt loop.
347	*/
348	PVM pVM = pUVM->pVM;
349	int rc = VINF_SUCCESS;
350	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
351	//unsigned cLoops = 0;
352	for (;;)
353	{
354	/*
355	* Work the timers and check if we can exit.
356	* The poll call gives us the ticks left to the next event in
357	* addition to perhaps set an FF.
358	*/
359	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
360	PDMR3Poll(pVM);
361	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
362	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
363	TMR3TimerQueuesDo(pVM);
364	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
365	if (VM_FF_ISPENDING(pVM, fMask))
366	break;
367	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
368	if (VM_FF_ISPENDING(pVM, fMask))
369	break;
370
371	/*
372	* Wait for a while. Someone will wake us up or interrupt the call if
373	* anything needs our attention.
374	*/
375	if (u64NanoTS < 50000)
376	{
377	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
378	/* spin */;
379	}
380	else
381	{
382	VMMR3YieldStop(pVM);
383	//uint64_t u64Start = RTTimeNanoTS();
384	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
385	{
386	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
387	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, a);
388	RTThreadYield(); /* this is the best we can do here */
389	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, a);
390	}
391	else if (u64NanoTS < 2000000)
392	{
393	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
394	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
395	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1);
396	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
397	}
398	else
399	{
400	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
401	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
402	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
403	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
404	}
405	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
406	//RTLogPrintf(" -> rc=%Vrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
407	}
408	if (rc == VERR_TIMEOUT)
409	rc = VINF_SUCCESS;
410	else if (VBOX_FAILURE(rc))
411	{
412	AssertRC(rc != VERR_INTERRUPTED);
413	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
414	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
415	VM_FF_SET(pVM, VM_FF_TERMINATE);
416	rc = VERR_INTERNAL_ERROR;
417	break;
418	}
419	}
420
421	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
422	return rc;
423	}
424
425
426	/**
427	* Initialize the configuration of halt method 1 & 2.
428	*
429	* @return VBox status code. Failure on invalid CFGM data.
430	* @param pVM The VM handle.
431	*/
432	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
433	{
434	/*
435	* The defaults.
436	*/
437	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
438	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
439	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
440	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
441	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
442	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
443	#else
444	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
445	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
446	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
447	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
448	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
449	#endif
450
451	/*
452	* Query overrides.
453	*
454	* I don't have time to bother with niceities such as invalid value checks
455	* here right now. sorry.
456	*/
457	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
458	if (pCfg)
459	{
460	uint32_t u32;
461	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
462	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
463	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
464	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
465	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
466	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
467	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
468	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
469	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
470	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
471	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
472	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
473	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
474	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
475	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
476	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
477	}
478
479	return VINF_SUCCESS;
480	}
481
482
483	/**
484	* Initialize halt method 1.
485	*
486	* @return VBox status code.
487	* @param pUVM Pointer to the user mode VM structure.
488	*/
489	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
490	{
491	return vmR3HaltMethod12ReadConfigU(pUVM);
492	}
493
494
495	/**
496	* Method 1 - Block whenever possible, and when lagging behind
497	* switch to spinning for 10-30ms with occational blocking until
498	* the lag has been eliminated.
499	*/
500	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
501	{
502	PVM pVM = pUVM->pVM;
503
504	/*
505	* To simplify things, we decide up-front whether we should switch to spinning or
506	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
507	* and that it will generate interrupts or other events that will cause us to exit
508	* the halt loop.
509	*/
510	bool fBlockOnce = false;
511	bool fSpinning = false;
512	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
513	if (u32CatchUpPct /* non-zero if catching up */)
514	{
515	if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
516	{
517	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
518	if (fSpinning)
519	{
520	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
521	fBlockOnce = u64Now - pUVM->vm.s.Halt.Method12.u64LastBlockTS
522	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
523	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
524	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
525	}
526	else
527	{
528	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
529	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
530	}
531	}
532	else
533	{
534	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
535	if (fSpinning)
536	pUVM->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
537	}
538	}
539	else if (pUVM->vm.s.Halt.Method12.u64StartSpinTS)
540	{
541	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVM->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
542	pUVM->vm.s.Halt.Method12.u64StartSpinTS = 0;
543	}
544
545	/*
546	* Halt loop.
547	*/
548	int rc = VINF_SUCCESS;
549	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
550	unsigned cLoops = 0;
551	for (;; cLoops++)
552	{
553	/*
554	* Work the timers and check if we can exit.
555	*/
556	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
557	PDMR3Poll(pVM);
558	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
559	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
560	TMR3TimerQueuesDo(pVM);
561	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
562	if (VM_FF_ISPENDING(pVM, fMask))
563	break;
564
565	/*
566	* Estimate time left to the next event.
567	*/
568	uint64_t u64NanoTS = TMVirtualToNano(pVM, TMTimerPoll(pVM));
569	if (VM_FF_ISPENDING(pVM, fMask))
570	break;
571
572	/*
573	* Block if we're not spinning and the interval isn't all that small.
574	*/
575	if ( ( !fSpinning
576	\|\| fBlockOnce)
577	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
578	&& u64NanoTS >= 100000) /* 0.100 ms */
579	#else
580	&& u64NanoTS >= 250000) /* 0.250 ms */
581	#endif
582	{
583	const uint64_t Start = pUVM->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
584	VMMR3YieldStop(pVM);
585
586	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
587	if (cMilliSecs <= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
588	cMilliSecs = 1;
589	else
590	cMilliSecs -= pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
591	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
592	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, a);
593	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, cMilliSecs);
594	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, a);
595	if (rc == VERR_TIMEOUT)
596	rc = VINF_SUCCESS;
597	else if (VBOX_FAILURE(rc))
598	{
599	AssertRC(rc != VERR_INTERRUPTED);
600	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
601	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
602	VM_FF_SET(pVM, VM_FF_TERMINATE);
603	rc = VERR_INTERNAL_ERROR;
604	break;
605	}
606
607	/*
608	* Calc the statistics.
609	* Update averages every 16th time, and flush parts of the history every 64th time.
610	*/
611	const uint64_t Elapsed = RTTimeNanoTS() - Start;
612	pUVM->vm.s.Halt.Method12.cNSBlocked += Elapsed;
613	if (Elapsed > u64NanoTS)
614	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
615	pUVM->vm.s.Halt.Method12.cBlocks++;
616	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0xf))
617	{
618	pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVM->vm.s.Halt.Method12.cNSBlockedTooLong / pUVM->vm.s.Halt.Method12.cBlocks;
619	if (!(pUVM->vm.s.Halt.Method12.cBlocks & 0x3f))
620	{
621	pUVM->vm.s.Halt.Method12.cNSBlockedTooLong = pUVM->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
622	pUVM->vm.s.Halt.Method12.cBlocks = 0x40;
623	}
624	}
625	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
626
627	/*
628	* Clear the block once flag if we actually blocked.
629	*/
630	if ( fBlockOnce
631	&& Elapsed > 100000 /* 0.1 ms */)
632	fBlockOnce = false;
633	}
634	}
635	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
636
637	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
638	return rc;
639	}
640
641
642	/**
643	* Initialize the global 1 halt method.
644	*
645	* @return VBox status code.
646	* @param pUVM Pointer to the user mode VM structure.
647	*/
648	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
649	{
650	return VINF_SUCCESS;
651	}
652
653
654	/**
655	* The global 1 halt method - Block in GMM (ring-0) and let it
656	* try take care of the global scheduling of EMT threads.
657	*/
658	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVM pUVM, const uint32_t fMask, uint64_t u64Now)
659	{
660	PVM pVM = pUVM->pVM;
661
662	/*
663	* Halt loop.
664	*/
665	int rc = VINF_SUCCESS;
666	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
667	unsigned cLoops = 0;
668	for (;; cLoops++)
669	{
670	/*
671	* Work the timers and check if we can exit.
672	*/
673	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltPoll, a);
674	PDMR3Poll(pVM);
675	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltPoll, a);
676	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltTimers, b);
677	TMR3TimerQueuesDo(pVM);
678	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltTimers, b);
679	if (VM_FF_ISPENDING(pVM, fMask))
680	break;
681
682	/*
683	* Estimate time left to the next event.
684	*/
685	uint64_t u64Delta;
686	uint64_t u64GipTime = TMTimerPollGIP(pVM, &u64Delta);
687	if (VM_FF_ISPENDING(pVM, fMask))
688	break;
689
690	/*
691	* Block if we're not spinning and the interval isn't all that small.
692	*/
693	if (u64Delta > 50000 /* 0.050ms */)
694	{
695	VMMR3YieldStop(pVM);
696	if (VM_FF_ISPENDING(pVM, fMask))
697	break;
698
699	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
700	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltBlock, c);
701	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
702	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltBlock, c);
703	if (rc == VERR_INTERRUPTED)
704	rc = VINF_SUCCESS;
705	else if (VBOX_FAILURE(rc))
706	{
707	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Vrc\n", rc));
708	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
709	VM_FF_SET(pVM, VM_FF_TERMINATE);
710	rc = VERR_INTERNAL_ERROR;
711	break;
712	}
713	}
714	/*
715	* When spinning call upon the GVMM and do some wakups once
716	* in a while, it's not like we're actually busy or anything.
717	*/
718	else if (!(cLoops & 0x1fff))
719	{
720	STAM_REL_PROFILE_START(&pUVM->vm.s.StatHaltYield, d);
721	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
722	STAM_REL_PROFILE_STOP(&pUVM->vm.s.StatHaltYield, d);
723	}
724	}
725	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
726
727	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
728	return rc;
729	}
730
731
732	/**
733	* The global 1 halt method - VMR3Wait() worker.
734	*
735	* @returns VBox status code.
736	* @param pUVM Pointer to the user mode VM structure.
737	*/
738	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVM pUVM)
739	{
740	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
741
742	PVM pVM = pUVM->pVM;
743	int rc = VINF_SUCCESS;
744	for (;;)
745	{
746	/*
747	* Check Relevant FFs.
748	*/
749	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
750	break;
751
752	/*
753	* Wait for a while. Someone will wake us up or interrupt the call if
754	* anything needs our attention.
755	*/
756	rc = SUPCallVMMR0Ex(pVM->pVMR0, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
757	if (rc == VERR_INTERRUPTED)
758	rc = VINF_SUCCESS;
759	else if (VBOX_FAILURE(rc))
760	{
761	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
762	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
763	VM_FF_SET(pVM, VM_FF_TERMINATE);
764	rc = VERR_INTERNAL_ERROR;
765	break;
766	}
767
768	}
769
770	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
771	return rc;
772	}
773
774
775	/**
776	* The global 1 halt method - VMR3NotifyFF() worker.
777	*
778	* @param pUVM Pointer to the user mode VM structure.
779	* @param fNotifiedREM See VMR3NotifyFF().
780	*/
781	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyFF(PUVM pUVM, bool fNotifiedREM)
782	{
783	if (pUVM->vm.s.fWait)
784	{
785	int rc = SUPCallVMMR0Ex(pUVM->pVM->pVMR0, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
786	AssertRC(rc);
787	}
788	else if (!fNotifiedREM)
789	REMR3NotifyFF(pUVM->pVM);
790	}
791
792
793	/**
794	* Bootstrap VMR3Wait() worker.
795	*
796	* @returns VBox status code.
797	* @param pUVM Pointer to the user mode VM structure.
798	*/
799	static DECLCALLBACK(int) vmR3BootstrapWait(PUVM pUVM)
800	{
801	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
802
803	int rc = VINF_SUCCESS;
804	for (;;)
805	{
806	/*
807	* Check Relevant FFs.
808	*/
809	if (pUVM->vm.s.pReqs)
810	break;
811	if ( pUVM->pVM
812	&& VM_FF_ISPENDING(pUVM->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
813	break;
814	if (pUVM->vm.s.fTerminateEMT)
815	break;
816
817	/*
818	* Wait for a while. Someone will wake us up or interrupt the call if
819	* anything needs our attention.
820	*/
821	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
822	if (rc == VERR_TIMEOUT)
823	rc = VINF_SUCCESS;
824	else if (VBOX_FAILURE(rc))
825	{
826	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
827	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
828	if (pUVM->pVM)
829	VM_FF_SET(pUVM->pVM, VM_FF_TERMINATE);
830	rc = VERR_INTERNAL_ERROR;
831	break;
832	}
833
834	}
835
836	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
837	return rc;
838	}
839
840
841	/**
842	* Bootstrap VMR3NotifyFF() worker.
843	*
844	* @param pUVM Pointer to the user mode VM structure.
845	* @param fNotifiedREM See VMR3NotifyFF().
846	*/
847	static DECLCALLBACK(void) vmR3BootstrapNotifyFF(PUVM pUVM, bool fNotifiedREM)
848	{
849	if (pUVM->vm.s.fWait)
850	{
851	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
852	AssertRC(rc);
853	}
854	}
855
856
857	/**
858	* Default VMR3Wait() worker.
859	*
860	* @returns VBox status code.
861	* @param pUVM Pointer to the user mode VM structure.
862	*/
863	static DECLCALLBACK(int) vmR3DefaultWait(PUVM pUVM)
864	{
865	ASMAtomicWriteBool(&pUVM->vm.s.fWait, true);
866
867	PVM pVM = pUVM->pVM;
868	int rc = VINF_SUCCESS;
869	for (;;)
870	{
871	/*
872	* Check Relevant FFs.
873	*/
874	if (VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
875	break;
876
877	/*
878	* Wait for a while. Someone will wake us up or interrupt the call if
879	* anything needs our attention.
880	*/
881	rc = RTSemEventWait(pUVM->vm.s.EventSemWait, 1000);
882	if (rc == VERR_TIMEOUT)
883	rc = VINF_SUCCESS;
884	else if (VBOX_FAILURE(rc))
885	{
886	AssertMsgFailed(("RTSemEventWait->%Vrc\n", rc));
887	ASMAtomicUoWriteBool(&pUVM->vm.s.fTerminateEMT, true);
888	VM_FF_SET(pVM, VM_FF_TERMINATE);
889	rc = VERR_INTERNAL_ERROR;
890	break;
891	}
892
893	}
894
895	ASMAtomicUoWriteBool(&pUVM->vm.s.fWait, false);
896	return rc;
897	}
898
899
900	/**
901	* Default VMR3NotifyFF() worker.
902	*
903	* @param pUVM Pointer to the user mode VM structure.
904	* @param fNotifiedREM See VMR3NotifyFF().
905	*/
906	static DECLCALLBACK(void) vmR3DefaultNotifyFF(PUVM pUVM, bool fNotifiedREM)
907	{
908	if (pUVM->vm.s.fWait)
909	{
910	int rc = RTSemEventSignal(pUVM->vm.s.EventSemWait);
911	AssertRC(rc);
912	}
913	else if (!fNotifiedREM)
914	REMR3NotifyFF(pUVM->pVM);
915	}
916
917
918	/**
919	* Array with halt method descriptors.
920	* VMINT::iHaltMethod contains an index into this array.
921	*/
922	static const struct VMHALTMETHODDESC
923	{
924	/** The halt method id. */
925	VMHALTMETHOD enmHaltMethod;
926	/** The init function for loading config and initialize variables. */
927	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
928	/** The term function. */
929	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
930	/** The halt function. */
931	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVM pUVM, const uint32_t fMask, uint64_t u64Now));
932	/** The wait function. */
933	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVM pUVM));
934	/** The notifyFF function. */
935	DECLR3CALLBACKMEMBER(void, pfnNotifyFF,(PUVM pUVM, bool fNotifiedREM));
936	} g_aHaltMethods[] =
937	{
938	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyFF },
939	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyFF },
940	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyFF },
941	//{ VMHALTMETHOD_2, vmR3HaltMethod2Init, vmR3HaltMethod2Term, vmR3HaltMethod2DoHalt, vmR3HaltMethod2Wait, vmR3HaltMethod2NotifyFF },
942	{ VMHALTMETHOD_GLOBAL_1,vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyFF },
943	};
944
945
946	/**
947	* Notify the emulation thread (EMT) about pending Forced Action (FF).
948	*
949	* This function is called by thread other than EMT to make
950	* sure EMT wakes up and promptly service an FF request.
951	*
952	* @param pVM VM handle.
953	* @param fNotifiedREM Set if REM have already been notified. If clear the
954	* generic REMR3NotifyFF() method is called.
955	*/
956	VMMR3DECL(void) VMR3NotifyFF(PVM pVM, bool fNotifiedREM)
957	{
958	LogFlow(("VMR3NotifyFF:\n"));
959	PUVM pUVM = pVM->pUVM;
960	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
961	}
962
963
964	/**
965	* Notify the emulation thread (EMT) about pending Forced Action (FF).
966	*
967	* This function is called by thread other than EMT to make
968	* sure EMT wakes up and promptly service an FF request.
969	*
970	* @param pUVM Pointer to the user mode VM structure.
971	* @param fNotifiedREM Set if REM have already been notified. If clear the
972	* generic REMR3NotifyFF() method is called.
973	*/
974	VMMR3DECL(void) VMR3NotifyFFU(PUVM pUVM, bool fNotifiedREM)
975	{
976	LogFlow(("VMR3NotifyFF:\n"));
977	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyFF(pUVM, fNotifiedREM);
978	}
979
980
981	/**
982	* Halted VM Wait.
983	* Any external event will unblock the thread.
984	*
985	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
986	* case an appropriate status code is returned.
987	* @param pVM VM handle.
988	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
989	* @thread The emulation thread.
990	*/
991	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, bool fIgnoreInterrupts)
992	{
993	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
994
995	/*
996	* Check Relevant FFs.
997	*/
998	const uint32_t fMask = !fIgnoreInterrupts
999	? VM_FF_EXTERNAL_HALTED_MASK
1000	: VM_FF_EXTERNAL_HALTED_MASK & ~(VM_FF_INTERRUPT_APIC \| VM_FF_INTERRUPT_PIC);
1001	if (VM_FF_ISPENDING(pVM, fMask))
1002	{
1003	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1004	return VINF_SUCCESS;
1005	}
1006
1007	/*
1008	* The yielder is suspended while we're halting, while TM might have clock(s) running
1009	* only at certain times and need to be notified..
1010	*/
1011	VMMR3YieldSuspend(pVM);
1012	TMNotifyStartOfHalt(pVM);
1013
1014	/*
1015	* Record halt averages for the last second.
1016	*/
1017	PUVM pUVM = pVM->pUVM;
1018	uint64_t u64Now = RTTimeNanoTS();
1019	int64_t off = u64Now - pUVM->vm.s.u64HaltsStartTS;
1020	if (off > 1000000000)
1021	{
1022	if (off > _4G \|\| !pUVM->vm.s.cHalts)
1023	{
1024	pUVM->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1025	pUVM->vm.s.HaltFrequency = 1;
1026	}
1027	else
1028	{
1029	pUVM->vm.s.HaltInterval = (uint32_t)off / pUVM->vm.s.cHalts;
1030	pUVM->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVM->vm.s.cHalts, 1000000000, (uint32_t)off);
1031	}
1032	pUVM->vm.s.u64HaltsStartTS = u64Now;
1033	pUVM->vm.s.cHalts = 0;
1034	}
1035	pUVM->vm.s.cHalts++;
1036
1037	/*
1038	* Do the halt.
1039	*/
1040	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVM, fMask, u64Now);
1041
1042	/*
1043	* Notify TM and resume the yielder
1044	*/
1045	TMNotifyEndOfHalt(pVM);
1046	VMMR3YieldResume(pVM);
1047
1048	LogFlow(("VMR3WaitHalted: returns %Vrc (FF %#x)\n", rc, pVM->fForcedActions));
1049	return rc;
1050	}
1051
1052
1053	/**
1054	* Suspended VM Wait.
1055	* Only a handful of forced actions will cause the function to
1056	* return to the caller.
1057	*
1058	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1059	* case an appropriate status code is returned.
1060	* @param pUVM Pointer to the user mode VM structure.
1061	* @thread The emulation thread.
1062	*/
1063	VMMR3DECL(int) VMR3WaitU(PUVM pUVM)
1064	{
1065	LogFlow(("VMR3WaitU:\n"));
1066
1067	/*
1068	* Check Relevant FFs.
1069	*/
1070	PVM pVM = pUVM->pVM;
1071	if ( pVM
1072	&& VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK))
1073	{
1074	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fForcedActions));
1075	return VINF_SUCCESS;
1076	}
1077
1078	/*
1079	* Do waiting according to the halt method (so VMR3NotifyFF
1080	* doesn't have to special case anything).
1081	*/
1082	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVM);
1083	LogFlow(("VMR3WaitU: returns %Vrc (FF %#x)\n", rc, pVM ? pVM->fForcedActions : 0));
1084	return rc;
1085	}
1086
1087
1088	/**
1089	* Changes the halt method.
1090	*
1091	* @returns VBox status code.
1092	* @param pUVM Pointer to the user mode VM structure.
1093	* @param enmHaltMethod The new halt method.
1094	* @thread EMT.
1095	*/
1096	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1097	{
1098	PVM pVM = pUVM->pVM; Assert(pVM);
1099	VM_ASSERT_EMT(pVM);
1100	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1101
1102	/*
1103	* Resolve default (can be overridden in the configuration).
1104	*/
1105	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1106	{
1107	uint32_t u32;
1108	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1109	if (VBOX_SUCCESS(rc))
1110	{
1111	enmHaltMethod = (VMHALTMETHOD)u32;
1112	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1113	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1114	}
1115	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1116	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1117	else
1118	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1119	//enmHaltMethod = VMHALTMETHOD_1;
1120	//enmHaltMethod = VMHALTMETHOD_OLD;
1121	}
1122	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1123
1124	/*
1125	* Find the descriptor.
1126	*/
1127	unsigned i = 0;
1128	while ( i < RT_ELEMENTS(g_aHaltMethods)
1129	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1130	i++;
1131	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1132
1133	/*
1134	* Terminate the old one.
1135	*/
1136	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1137	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1138	{
1139	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1140	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1141	}
1142
1143	/*
1144	* Init the new one.
1145	*/
1146	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1147	if (g_aHaltMethods[i].pfnInit)
1148	{
1149	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1150	AssertRCReturn(rc, rc);
1151	}
1152	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1153
1154	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1155	return VINF_SUCCESS;
1156	}
1157

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 13791

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