VMEmt.cpp@ 20065

Last change on this file since 20065 was 19821, checked in by vboxsync, 16 years ago
TM: TMTimerPoll cleanup.
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File size: 39.5 KB

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1	/* $Id: VMEmt.cpp 19821 2009-05-19 13:28:56Z 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	* Internal Functions *
49	*******************************************************************************/
50	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu);
51
52
53	/**
54	* The emulation thread main function.
55	*
56	* @returns Thread exit code.
57	* @param ThreadSelf The handle to the executing thread.
58	* @param pvArgs Pointer to the user mode per-VCpu structure (UVMPCU).
59	*/
60	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
61	{
62	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
63	return vmR3EmulationThreadWithId(ThreadSelf, pUVCpu, pUVCpu->idCpu);
64	}
65
66
67	/**
68	* The emulation thread main function, with Virtual CPU ID for debugging.
69	*
70	* @returns Thread exit code.
71	* @param ThreadSelf The handle to the executing thread.
72	* @param pUVCpu Pointer to the user mode per-VCpu structure.
73	* @param idCpu The virtual CPU ID, for backtrace purposes.
74	*/
75	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu)
76	{
77	PUVM pUVM = pUVCpu->pUVM;
78	int rc;
79
80	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
81	("Invalid arguments to the emulation thread!\n"));
82
83	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVCpu);
84	AssertReleaseMsgRCReturn(rc, ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
85
86	/*
87	* The request loop.
88	*/
89	rc = VINF_SUCCESS;
90	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
91	VMSTATE enmBefore = VMSTATE_CREATED; /* (only used for logging atm.) */
92	for (;;)
93	{
94	/*
95	* During early init there is no pVM, so make a special path
96	* for that to keep things clearly separate.
97	*/
98	if (!pUVM->pVM)
99	{
100	/*
101	* Check for termination first.
102	*/
103	if (pUVM->vm.s.fTerminateEMT)
104	{
105	rc = VINF_EM_TERMINATE;
106	break;
107	}
108
109	/*
110	* Only the first VCPU may initialize the VM during early init
111	* and must therefore service all VMCPUID_ANY requests.
112	* See also VMR3Create
113	*/
114	if ( pUVM->vm.s.pReqs
115	&& pUVCpu->idCpu == 0)
116	{
117	/*
118	* Service execute in any EMT request.
119	*/
120	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
121	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
122	}
123	else if (pUVCpu->vm.s.pReqs)
124	{
125	/*
126	* Service execute in specific EMT request.
127	*/
128	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
129	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_CREATING));
130	}
131	else
132	{
133	/*
134	* Nothing important is pending, so wait for something.
135	*/
136	rc = VMR3WaitU(pUVCpu);
137	if (RT_FAILURE(rc))
138	break;
139	}
140	}
141	else
142	{
143	/*
144	* Pending requests which needs servicing?
145	*
146	* We check for state changes in addition to status codes when
147	* servicing requests. (Look after the ifs.)
148	*/
149	PVM pVM = pUVM->pVM;
150	enmBefore = pVM->enmVMState;
151	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
152	\|\| pUVM->vm.s.fTerminateEMT)
153	{
154	rc = VINF_EM_TERMINATE;
155	break;
156	}
157	if (pUVM->vm.s.pReqs)
158	{
159	/*
160	* Service execute in any EMT request.
161	*/
162	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
163	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
164	}
165	else if (pUVCpu->vm.s.pReqs)
166	{
167	/*
168	* Service execute in specific EMT request.
169	*/
170	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
171	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pVM->enmVMState));
172	}
173	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
174	{
175	/*
176	* Service the debugger request.
177	*/
178	rc = DBGFR3VMMForcedAction(pVM);
179	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
180	}
181	else if (VM_FF_TESTANDCLEAR(pVM, VM_FF_RESET_BIT))
182	{
183	/*
184	* Service a delayed reset request.
185	*/
186	rc = VMR3Reset(pVM);
187	VM_FF_CLEAR(pVM, VM_FF_RESET);
188	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
189	}
190	else
191	{
192	/*
193	* Nothing important is pending, so wait for something.
194	*/
195	rc = VMR3WaitU(pUVCpu);
196	if (RT_FAILURE(rc))
197	break;
198	}
199
200	/*
201	* Check for termination requests, these have extremely high priority.
202	*/
203	if ( rc == VINF_EM_TERMINATE
204	\|\| VM_FF_ISSET(pVM, VM_FF_TERMINATE)
205	\|\| pUVM->vm.s.fTerminateEMT)
206	break;
207	}
208
209	/*
210	* Some requests (both VMR3Req* and the DBGF) can potentially resume
211	* or start the VM, in that case we'll get a change in VM status
212	* indicating that we're now running.
213	*/
214	if ( RT_SUCCESS(rc)
215	&& pUVM->pVM)
216	{
217	PVM pVM = pUVM->pVM;
218	PVMCPU pVCpu = &pVM->aCpus[idCpu];
219	if ( pVM->enmVMState == VMSTATE_RUNNING
220	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
221	{
222	rc = EMR3ExecuteVM(pVM, pVCpu);
223	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
224	if ( EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION
225	&& pVM->enmVMState == VMSTATE_RUNNING)
226	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
227	}
228	}
229
230	} /* forever */
231
232
233	/*
234	* Exiting.
235	*/
236	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
237	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
238	if (pUVM->vm.s.fEMTDoesTheCleanup)
239	{
240	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
241	Assert(pUVM->pVM);
242	vmR3Destroy(pUVM->pVM);
243	vmR3DestroyFinalBitFromEMT(pUVM);
244	}
245	else
246	{
247	vmR3DestroyFinalBitFromEMT(pUVM);
248
249	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
250	}
251	Log(("vmR3EmulationThread: EMT is terminated.\n"));
252	return rc;
253	}
254
255
256	/**
257	* Gets the name of a halt method.
258	*
259	* @returns Pointer to a read only string.
260	* @param enmMethod The method.
261	*/
262	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
263	{
264	switch (enmMethod)
265	{
266	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
267	case VMHALTMETHOD_DEFAULT: return "default";
268	case VMHALTMETHOD_OLD: return "old";
269	case VMHALTMETHOD_1: return "method1";
270	//case VMHALTMETHOD_2: return "method2";
271	case VMHALTMETHOD_GLOBAL_1: return "global1";
272	default: return "unknown";
273	}
274	}
275
276
277	/**
278	* The old halt loop.
279	*/
280	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
281	{
282	/*
283	* Halt loop.
284	*/
285	PVM pVM = pUVCpu->pVM;
286	PVMCPU pVCpu = pUVCpu->pVCpu;
287
288	int rc = VINF_SUCCESS;
289	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
290	//unsigned cLoops = 0;
291	for (;;)
292	{
293	/*
294	* Work the timers and check if we can exit.
295	* The poll call gives us the ticks left to the next event in
296	* addition to perhaps set an FF.
297	*/
298	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
299	TMR3TimerQueuesDo(pVM);
300	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
301	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
302	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
303	break;
304	uint64_t u64NanoTS;
305	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
306	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
307	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
308	break;
309
310	/*
311	* Wait for a while. Someone will wake us up or interrupt the call if
312	* anything needs our attention.
313	*/
314	if (u64NanoTS < 50000)
315	{
316	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
317	/* spin */;
318	}
319	else
320	{
321	VMMR3YieldStop(pVM);
322	//uint64_t u64Start = RTTimeNanoTS();
323	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
324	{
325	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
326	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, a);
327	RTThreadYield(); /* this is the best we can do here */
328	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, a);
329	}
330	else if (u64NanoTS < 2000000)
331	{
332	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
333	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
334	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
335	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
336	}
337	else
338	{
339	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
340	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
341	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
342	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
343	}
344	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
345	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
346	}
347	if (rc == VERR_TIMEOUT)
348	rc = VINF_SUCCESS;
349	else if (RT_FAILURE(rc))
350	{
351	AssertRC(rc != VERR_INTERRUPTED);
352	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
353	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
354	VM_FF_SET(pVM, VM_FF_TERMINATE);
355	rc = VERR_INTERNAL_ERROR;
356	break;
357	}
358	}
359
360	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
361	return rc;
362	}
363
364
365	/**
366	* Initialize the configuration of halt method 1 & 2.
367	*
368	* @return VBox status code. Failure on invalid CFGM data.
369	* @param pVM The VM handle.
370	*/
371	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
372	{
373	/*
374	* The defaults.
375	*/
376	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
377	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
378	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
379	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
380	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
381	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
382	#else
383	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
384	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
385	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
386	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
387	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
388	#endif
389
390	/*
391	* Query overrides.
392	*
393	* I don't have time to bother with niceities such as invalid value checks
394	* here right now. sorry.
395	*/
396	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
397	if (pCfg)
398	{
399	uint32_t u32;
400	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
401	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
402	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
403	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
404	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
405	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
406	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
407	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
408	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
409	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
410	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
411	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
412	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
413	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
414	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
415	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
416	}
417
418	return VINF_SUCCESS;
419	}
420
421
422	/**
423	* Initialize halt method 1.
424	*
425	* @return VBox status code.
426	* @param pUVM Pointer to the user mode VM structure.
427	*/
428	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
429	{
430	return vmR3HaltMethod12ReadConfigU(pUVM);
431	}
432
433
434	/**
435	* Method 1 - Block whenever possible, and when lagging behind
436	* switch to spinning for 10-30ms with occational blocking until
437	* the lag has been eliminated.
438	*/
439	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
440	{
441	PUVM pUVM = pUVCpu->pUVM;
442	PVMCPU pVCpu = pUVCpu->pVCpu;
443	PVM pVM = pUVCpu->pVM;
444
445	/*
446	* To simplify things, we decide up-front whether we should switch to spinning or
447	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
448	* and that it will generate interrupts or other events that will cause us to exit
449	* the halt loop.
450	*/
451	bool fBlockOnce = false;
452	bool fSpinning = false;
453	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
454	if (u32CatchUpPct /* non-zero if catching up */)
455	{
456	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
457	{
458	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
459	if (fSpinning)
460	{
461	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
462	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
463	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
464	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
465	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
466	}
467	else
468	{
469	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
470	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
471	}
472	}
473	else
474	{
475	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
476	if (fSpinning)
477	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
478	}
479	}
480	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
481	{
482	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
483	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
484	}
485
486	/*
487	* Halt loop.
488	*/
489	int rc = VINF_SUCCESS;
490	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
491	unsigned cLoops = 0;
492	for (;; cLoops++)
493	{
494	/*
495	* Work the timers and check if we can exit.
496	*/
497	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
498	TMR3TimerQueuesDo(pVM);
499	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
500	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
501	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
502	break;
503
504	/*
505	* Estimate time left to the next event.
506	*/
507	uint64_t u64NanoTS;
508	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
509	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
510	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
511	break;
512
513	/*
514	* Block if we're not spinning and the interval isn't all that small.
515	*/
516	if ( ( !fSpinning
517	\|\| fBlockOnce)
518	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
519	&& u64NanoTS >= 100000) /* 0.100 ms */
520	#else
521	&& u64NanoTS >= 250000) /* 0.250 ms */
522	#endif
523	{
524	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
525	VMMR3YieldStop(pVM);
526
527	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
528	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
529	cMilliSecs = 1;
530	else
531	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
532	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
533	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
534	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
535	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
536	if (rc == VERR_TIMEOUT)
537	rc = VINF_SUCCESS;
538	else if (RT_FAILURE(rc))
539	{
540	AssertRC(rc != VERR_INTERRUPTED);
541	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
542	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
543	VM_FF_SET(pVM, VM_FF_TERMINATE);
544	rc = VERR_INTERNAL_ERROR;
545	break;
546	}
547
548	/*
549	* Calc the statistics.
550	* Update averages every 16th time, and flush parts of the history every 64th time.
551	*/
552	const uint64_t Elapsed = RTTimeNanoTS() - Start;
553	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
554	if (Elapsed > u64NanoTS)
555	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
556	pUVCpu->vm.s.Halt.Method12.cBlocks++;
557	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
558	{
559	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
560	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
561	{
562	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
563	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
564	}
565	}
566	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
567
568	/*
569	* Clear the block once flag if we actually blocked.
570	*/
571	if ( fBlockOnce
572	&& Elapsed > 100000 /* 0.1 ms */)
573	fBlockOnce = false;
574	}
575	}
576	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
577
578	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
579	return rc;
580	}
581
582
583	/**
584	* Initialize the global 1 halt method.
585	*
586	* @return VBox status code.
587	* @param pUVM Pointer to the user mode VM structure.
588	*/
589	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
590	{
591	return VINF_SUCCESS;
592	}
593
594
595	/**
596	* The global 1 halt method - Block in GMM (ring-0) and let it
597	* try take care of the global scheduling of EMT threads.
598	*/
599	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
600	{
601	PUVM pUVM = pUVCpu->pUVM;
602	PVMCPU pVCpu = pUVCpu->pVCpu;
603	PVM pVM = pUVCpu->pVM;
604	Assert(VMMGetCpu(pVM) == pVCpu);
605
606	/*
607	* Halt loop.
608	*/
609	int rc = VINF_SUCCESS;
610	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
611	unsigned cLoops = 0;
612	for (;; cLoops++)
613	{
614	/*
615	* Work the timers and check if we can exit.
616	*/
617	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
618	TMR3TimerQueuesDo(pVM);
619	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
620	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
621	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
622	break;
623
624	/*
625	* Estimate time left to the next event.
626	*/
627	uint64_t u64Delta;
628	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
629	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
630	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
631	break;
632
633	/*
634	* Block if we're not spinning and the interval isn't all that small.
635	*/
636	if (u64Delta > 50000 /* 0.050ms */)
637	{
638	VMMR3YieldStop(pVM);
639	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
640	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
641	break;
642
643	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
644	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, c);
645	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
646	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, c);
647	if (rc == VERR_INTERRUPTED)
648	rc = VINF_SUCCESS;
649	else if (RT_FAILURE(rc))
650	{
651	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc));
652	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
653	VM_FF_SET(pVM, VM_FF_TERMINATE);
654	rc = VERR_INTERNAL_ERROR;
655	break;
656	}
657	}
658	/*
659	* When spinning call upon the GVMM and do some wakups once
660	* in a while, it's not like we're actually busy or anything.
661	*/
662	else if (!(cLoops & 0x1fff))
663	{
664	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, d);
665	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
666	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, d);
667	}
668	}
669	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
670
671	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
672	return rc;
673	}
674
675
676	/**
677	* The global 1 halt method - VMR3Wait() worker.
678	*
679	* @returns VBox status code.
680	* @param pUVCpu Pointer to the user mode VMCPU structure.
681	*/
682	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
683	{
684	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
685
686	PVM pVM = pUVCpu->pUVM->pVM;
687	PVMCPU pVCpu = VMMGetCpu(pVM);
688	Assert(pVCpu->idCpu == pUVCpu->idCpu);
689
690	int rc = VINF_SUCCESS;
691	for (;;)
692	{
693	/*
694	* Check Relevant FFs.
695	*/
696	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
697	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
698	break;
699
700	/*
701	* Wait for a while. Someone will wake us up or interrupt the call if
702	* anything needs our attention.
703	*/
704	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
705	if (rc == VERR_INTERRUPTED)
706	rc = VINF_SUCCESS;
707	else if (RT_FAILURE(rc))
708	{
709	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
710	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
711	VM_FF_SET(pVM, VM_FF_TERMINATE);
712	rc = VERR_INTERNAL_ERROR;
713	break;
714	}
715
716	}
717
718	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
719	return rc;
720	}
721
722
723	/**
724	* The global 1 halt method - VMR3NotifyFF() worker.
725	*
726	* @param pUVCpu Pointer to the user mode VMCPU structure.
727	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
728	*/
729	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
730	{
731	if (pUVCpu->vm.s.fWait)
732	{
733	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
734	AssertRC(rc);
735	}
736	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
737	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
738	&& pUVCpu->pVCpu)
739	{
740	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
741	if (enmState == VMCPUSTATE_STARTED_EXEC)
742	{
743	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
744	{
745	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
746	AssertRC(rc);
747	}
748	}
749	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
750	{
751	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
752	REMR3NotifyFF(pUVCpu->pVM);
753	}
754	}
755	}
756
757
758	/**
759	* Bootstrap VMR3Wait() worker.
760	*
761	* @returns VBox status code.
762	* @param pUVMCPU Pointer to the user mode VMCPU structure.
763	*/
764	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
765	{
766	PUVM pUVM = pUVCpu->pUVM;
767
768	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
769
770	int rc = VINF_SUCCESS;
771	for (;;)
772	{
773	/*
774	* Check Relevant FFs.
775	*/
776	if (pUVM->vm.s.pReqs) /* global requests pending? */
777	break;
778	if (pUVCpu->vm.s.pReqs) /* local requests pending? */
779	break;
780
781	if ( pUVCpu->pVM
782	&& ( VM_FF_ISPENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
783	\|\| VMCPU_FF_ISPENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
784	)
785	)
786	break;
787	if (pUVCpu->vm.s.fTerminateEMT)
788	break;
789
790	/*
791	* Wait for a while. Someone will wake us up or interrupt the call if
792	* anything needs our attention.
793	*/
794	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
795	if (rc == VERR_TIMEOUT)
796	rc = VINF_SUCCESS;
797	else if (RT_FAILURE(rc))
798	{
799	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
800	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
801	if (pUVCpu->pVM)
802	VM_FF_SET(pUVCpu->pVM, VM_FF_TERMINATE);
803	rc = VERR_INTERNAL_ERROR;
804	break;
805	}
806
807	}
808
809	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
810	return rc;
811	}
812
813
814	/**
815	* Bootstrap VMR3NotifyFF() worker.
816	*
817	* @param pUVCpu Pointer to the user mode VMCPU structure.
818	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
819	*/
820	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
821	{
822	if (pUVCpu->vm.s.fWait)
823	{
824	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
825	AssertRC(rc);
826	}
827	NOREF(fFlags);
828	}
829
830
831	/**
832	* Default VMR3Wait() worker.
833	*
834	* @returns VBox status code.
835	* @param pUVMCPU Pointer to the user mode VMCPU structure.
836	*/
837	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
838	{
839	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
840
841	PVM pVM = pUVCpu->pVM;
842	PVMCPU pVCpu = pUVCpu->pVCpu;
843	int rc = VINF_SUCCESS;
844	for (;;)
845	{
846	/*
847	* Check Relevant FFs.
848	*/
849	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
850	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
851	break;
852
853	/*
854	* Wait for a while. Someone will wake us up or interrupt the call if
855	* anything needs our attention.
856	*/
857	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
858	if (rc == VERR_TIMEOUT)
859	rc = VINF_SUCCESS;
860	else if (RT_FAILURE(rc))
861	{
862	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
863	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
864	VM_FF_SET(pVM, VM_FF_TERMINATE);
865	rc = VERR_INTERNAL_ERROR;
866	break;
867	}
868
869	}
870
871	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
872	return rc;
873	}
874
875
876	/**
877	* Default VMR3NotifyFF() worker.
878	*
879	* @param pUVCpu Pointer to the user mode VMCPU structure.
880	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
881	*/
882	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
883	{
884	if (pUVCpu->vm.s.fWait)
885	{
886	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
887	AssertRC(rc);
888	}
889	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
890	&& pUVCpu->pVCpu
891	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
892	REMR3NotifyFF(pUVCpu->pVM);
893	}
894
895
896	/**
897	* Array with halt method descriptors.
898	* VMINT::iHaltMethod contains an index into this array.
899	*/
900	static const struct VMHALTMETHODDESC
901	{
902	/** The halt method id. */
903	VMHALTMETHOD enmHaltMethod;
904	/** The init function for loading config and initialize variables. */
905	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
906	/** The term function. */
907	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
908	/** The VMR3WaitHaltedU function. */
909	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
910	/** The VMR3WaitU function. */
911	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
912	/** The VMR3NotifyCpuFFU function. */
913	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
914	/** The VMR3NotifyGlobalFFU function. */
915	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
916	} g_aHaltMethods[] =
917	{
918	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
919	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
920	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
921	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
922	};
923
924
925	/**
926	* Notify the emulation thread (EMT) about pending Forced Action (FF).
927	*
928	* This function is called by thread other than EMT to make
929	* sure EMT wakes up and promptly service an FF request.
930	*
931	* @param pUVM Pointer to the user mode VM structure.
932	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
933	*/
934	VMMR3DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
935	{
936	LogFlow(("VMR3NotifyGlobalFFU:\n"));
937	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
938
939	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
940	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
941	else
942	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
943	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
944	}
945
946
947	/**
948	* Notify the emulation thread (EMT) about pending Forced Action (FF).
949	*
950	* This function is called by thread other than EMT to make
951	* sure EMT wakes up and promptly service an FF request.
952	*
953	* @param pUVM Pointer to the user mode VM structure.
954	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
955	*/
956	VMMR3DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
957	{
958	PUVM pUVM = pUVCpu->pUVM;
959
960	LogFlow(("VMR3NotifyCpuFFU:\n"));
961	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
962	}
963
964
965	/**
966	* Halted VM Wait.
967	* Any external event will unblock the thread.
968	*
969	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
970	* case an appropriate status code is returned.
971	* @param pVM VM handle.
972	* @param pVCpu VMCPU handle.
973	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
974	* @thread The emulation thread.
975	*/
976	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
977	{
978	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
979
980	/*
981	* Check Relevant FFs.
982	*/
983	const uint32_t fMask = !fIgnoreInterrupts
984	? VMCPU_FF_EXTERNAL_HALTED_MASK
985	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
986	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
987	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
988	{
989	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
990	return VINF_SUCCESS;
991	}
992
993	/*
994	* The yielder is suspended while we're halting, while TM might have clock(s) running
995	* only at certain times and need to be notified..
996	*/
997	if (pVCpu->idCpu == 0)
998	VMMR3YieldSuspend(pVM);
999	TMNotifyStartOfHalt(pVCpu);
1000
1001	/*
1002	* Record halt averages for the last second.
1003	*/
1004	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1005	uint64_t u64Now = RTTimeNanoTS();
1006	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1007	if (off > 1000000000)
1008	{
1009	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1010	{
1011	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1012	pUVCpu->vm.s.HaltFrequency = 1;
1013	}
1014	else
1015	{
1016	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1017	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1018	}
1019	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1020	pUVCpu->vm.s.cHalts = 0;
1021	}
1022	pUVCpu->vm.s.cHalts++;
1023
1024	/*
1025	* Do the halt.
1026	*/
1027	Assert(VMCPU_GET_STATE(pVCpu) == VMCPUSTATE_STARTED);
1028	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1029	PUVM pUVM = pUVCpu->pUVM;
1030	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1031	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1032
1033	/*
1034	* Notify TM and resume the yielder
1035	*/
1036	TMNotifyEndOfHalt(pVCpu);
1037	if (pVCpu->idCpu == 0)
1038	VMMR3YieldResume(pVM);
1039
1040	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1041	return rc;
1042	}
1043
1044
1045	/**
1046	* Suspended VM Wait.
1047	* Only a handful of forced actions will cause the function to
1048	* return to the caller.
1049	*
1050	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1051	* case an appropriate status code is returned.
1052	* @param pUVCpu Pointer to the user mode VMCPU structure.
1053	* @thread The emulation thread.
1054	*/
1055	VMMR3DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1056	{
1057	LogFlow(("VMR3WaitU:\n"));
1058
1059	/*
1060	* Check Relevant FFs.
1061	*/
1062	PVM pVM = pUVCpu->pVM;
1063	PVMCPU pVCpu = pUVCpu->pVCpu;
1064
1065	if ( pVM
1066	&& ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1067	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1068	)
1069	)
1070	{
1071	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1072	return VINF_SUCCESS;
1073	}
1074
1075	/*
1076	* Do waiting according to the halt method (so VMR3NotifyFF
1077	* doesn't have to special case anything).
1078	*/
1079	PUVM pUVM = pUVCpu->pUVM;
1080	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1081	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pVM ? pVM->fGlobalForcedActions : 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 (RT_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	/** @todo SMP: Need rendezvous thing here, the other EMTs must not be
1142	* sleeping when we switch the notification method or we'll never
1143	* manage to wake them up properly and end up relying on timeouts... */
1144
1145	/*
1146	* Init the new one.
1147	*/
1148	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1149	if (g_aHaltMethods[i].pfnInit)
1150	{
1151	int rc = g_aHaltMethods[i].pfnInit(pUVM);
1152	AssertRCReturn(rc, rc);
1153	}
1154	pUVM->vm.s.enmHaltMethod = enmHaltMethod;
1155
1156	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1157	return VINF_SUCCESS;
1158	}
1159

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 20065

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