VMEmt.cpp@ 20855

Last change on this file since 20855 was 20855, checked in by vboxsync, 16 years ago
Extra assertion
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1	/* $Id: VMEmt.cpp 20855 2009-06-23 16:33:25Z 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	{
139	AssertFailed();
140	break;
141	}
142	}
143	}
144	else
145	{
146	/*
147	* Pending requests which needs servicing?
148	*
149	* We check for state changes in addition to status codes when
150	* servicing requests. (Look after the ifs.)
151	*/
152	PVM pVM = pUVM->pVM;
153	enmBefore = pVM->enmVMState;
154	if ( VM_FF_ISSET(pVM, VM_FF_TERMINATE)
155	\|\| pUVM->vm.s.fTerminateEMT)
156	{
157	rc = VINF_EM_TERMINATE;
158	break;
159	}
160	if (VM_FF_ISPENDING(pVM, VM_FF_EMT_RENDEZVOUS))
161	VMMR3EmtRendezvousFF(pVM, &pVM->aCpus[idCpu]);
162	if (pUVM->vm.s.pReqs)
163	{
164	/*
165	* Service execute in any EMT request.
166	*/
167	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
168	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
169	}
170	else if (pUVCpu->vm.s.pReqs)
171	{
172	/*
173	* Service execute in specific EMT request.
174	*/
175	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
176	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %d -> %d\n", pUVCpu->idCpu, rc, enmBefore, pVM->enmVMState));
177	}
178	else if (VM_FF_ISSET(pVM, VM_FF_DBGF))
179	{
180	/*
181	* Service the debugger request.
182	*/
183	rc = DBGFR3VMMForcedAction(pVM);
184	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
185	}
186	else if (VM_FF_TESTANDCLEAR(pVM, VM_FF_RESET_BIT))
187	{
188	/*
189	* Service a delayed reset request.
190	*/
191	rc = VMR3Reset(pVM);
192	VM_FF_CLEAR(pVM, VM_FF_RESET);
193	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %d -> %d\n", rc, enmBefore, pVM->enmVMState));
194	}
195	else
196	{
197	/*
198	* Nothing important is pending, so wait for something.
199	*/
200	rc = VMR3WaitU(pUVCpu);
201	if (RT_FAILURE(rc))
202	break;
203	}
204
205	/*
206	* Check for termination requests, these have extremely high priority.
207	*/
208	if ( rc == VINF_EM_TERMINATE
209	\|\| pUVM->vm.s.fTerminateEMT
210	\|\| ( pUVM->pVM /* pVM may have become invalid by now. */
211	&& VM_FF_ISSET(pUVM->pVM, VM_FF_TERMINATE)))
212	break;
213	}
214
215	/*
216	* Some requests (both VMR3Req* and the DBGF) can potentially resume
217	* or start the VM, in that case we'll get a change in VM status
218	* indicating that we're now running.
219	*/
220	if ( RT_SUCCESS(rc)
221	&& pUVM->pVM)
222	{
223	PVM pVM = pUVM->pVM;
224	PVMCPU pVCpu = &pVM->aCpus[idCpu];
225	if ( pVM->enmVMState == VMSTATE_RUNNING
226	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
227	{
228	rc = EMR3ExecuteVM(pVM, pVCpu);
229	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
230	if ( EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION
231	&& pVM->enmVMState == VMSTATE_RUNNING)
232	vmR3SetState(pVM, VMSTATE_GURU_MEDITATION);
233	}
234	}
235
236	} /* forever */
237
238
239	/*
240	* Exiting.
241	*/
242	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
243	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
244	if (pUVM->vm.s.fEMTDoesTheCleanup)
245	{
246	Log(("vmR3EmulationThread: executing delayed Destroy\n"));
247	Assert(pUVM->pVM);
248	vmR3Destroy(pUVM->pVM);
249	vmR3DestroyFinalBitFromEMT(pUVM);
250	}
251	else
252	{
253	vmR3DestroyFinalBitFromEMT(pUVM);
254
255	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
256	}
257	Log(("vmR3EmulationThread: EMT is terminated.\n"));
258	return rc;
259	}
260
261
262	/**
263	* Gets the name of a halt method.
264	*
265	* @returns Pointer to a read only string.
266	* @param enmMethod The method.
267	*/
268	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
269	{
270	switch (enmMethod)
271	{
272	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
273	case VMHALTMETHOD_DEFAULT: return "default";
274	case VMHALTMETHOD_OLD: return "old";
275	case VMHALTMETHOD_1: return "method1";
276	//case VMHALTMETHOD_2: return "method2";
277	case VMHALTMETHOD_GLOBAL_1: return "global1";
278	default: return "unknown";
279	}
280	}
281
282
283	/**
284	* The old halt loop.
285	*/
286	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
287	{
288	/*
289	* Halt loop.
290	*/
291	PVM pVM = pUVCpu->pVM;
292	PVMCPU pVCpu = pUVCpu->pVCpu;
293
294	int rc = VINF_SUCCESS;
295	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
296	//unsigned cLoops = 0;
297	for (;;)
298	{
299	/*
300	* Work the timers and check if we can exit.
301	* The poll call gives us the ticks left to the next event in
302	* addition to perhaps set an FF.
303	*/
304	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
305	TMR3TimerQueuesDo(pVM);
306	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
307	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
308	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
309	break;
310	uint64_t u64NanoTS;
311	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
312	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
313	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
314	break;
315
316	/*
317	* Wait for a while. Someone will wake us up or interrupt the call if
318	* anything needs our attention.
319	*/
320	if (u64NanoTS < 50000)
321	{
322	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
323	/* spin */;
324	}
325	else
326	{
327	VMMR3YieldStop(pVM);
328	//uint64_t u64Start = RTTimeNanoTS();
329	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
330	{
331	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
332	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, a);
333	RTThreadYield(); /* this is the best we can do here */
334	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, a);
335	}
336	else if (u64NanoTS < 2000000)
337	{
338	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
339	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
340	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
341	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
342	}
343	else
344	{
345	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
346	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
347	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
348	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
349	}
350	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
351	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
352	}
353	if (rc == VERR_TIMEOUT)
354	rc = VINF_SUCCESS;
355	else if (RT_FAILURE(rc))
356	{
357	AssertRC(rc != VERR_INTERRUPTED);
358	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
359	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
360	VM_FF_SET(pVM, VM_FF_TERMINATE);
361	rc = VERR_INTERNAL_ERROR;
362	break;
363	}
364	}
365
366	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
367	return rc;
368	}
369
370
371	/**
372	* Initialize the configuration of halt method 1 & 2.
373	*
374	* @return VBox status code. Failure on invalid CFGM data.
375	* @param pVM The VM handle.
376	*/
377	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
378	{
379	/*
380	* The defaults.
381	*/
382	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
383	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
384	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
385	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
386	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
387	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
388	#else
389	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
390	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
391	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
392	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
393	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
394	#endif
395
396	/*
397	* Query overrides.
398	*
399	* I don't have time to bother with niceities such as invalid value checks
400	* here right now. sorry.
401	*/
402	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
403	if (pCfg)
404	{
405	uint32_t u32;
406	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
407	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
408	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
409	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
410	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
411	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
412	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
413	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
414	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
415	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
416	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
417	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
418	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
419	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
420	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
421	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
422	}
423
424	return VINF_SUCCESS;
425	}
426
427
428	/**
429	* Initialize halt method 1.
430	*
431	* @return VBox status code.
432	* @param pUVM Pointer to the user mode VM structure.
433	*/
434	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
435	{
436	return vmR3HaltMethod12ReadConfigU(pUVM);
437	}
438
439
440	/**
441	* Method 1 - Block whenever possible, and when lagging behind
442	* switch to spinning for 10-30ms with occational blocking until
443	* the lag has been eliminated.
444	*/
445	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
446	{
447	PUVM pUVM = pUVCpu->pUVM;
448	PVMCPU pVCpu = pUVCpu->pVCpu;
449	PVM pVM = pUVCpu->pVM;
450
451	/*
452	* To simplify things, we decide up-front whether we should switch to spinning or
453	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
454	* and that it will generate interrupts or other events that will cause us to exit
455	* the halt loop.
456	*/
457	bool fBlockOnce = false;
458	bool fSpinning = false;
459	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
460	if (u32CatchUpPct /* non-zero if catching up */)
461	{
462	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
463	{
464	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
465	if (fSpinning)
466	{
467	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
468	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
469	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
470	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
471	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
472	}
473	else
474	{
475	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
476	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
477	}
478	}
479	else
480	{
481	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
482	if (fSpinning)
483	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
484	}
485	}
486	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
487	{
488	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
489	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
490	}
491
492	/*
493	* Halt loop.
494	*/
495	int rc = VINF_SUCCESS;
496	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
497	unsigned cLoops = 0;
498	for (;; cLoops++)
499	{
500	/*
501	* Work the timers and check if we can exit.
502	*/
503	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
504	TMR3TimerQueuesDo(pVM);
505	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
506	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
507	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
508	break;
509
510	/*
511	* Estimate time left to the next event.
512	*/
513	uint64_t u64NanoTS;
514	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
515	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
516	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
517	break;
518
519	/*
520	* Block if we're not spinning and the interval isn't all that small.
521	*/
522	if ( ( !fSpinning
523	\|\| fBlockOnce)
524	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
525	&& u64NanoTS >= 100000) /* 0.100 ms */
526	#else
527	&& u64NanoTS >= 250000) /* 0.250 ms */
528	#endif
529	{
530	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
531	VMMR3YieldStop(pVM);
532
533	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
534	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
535	cMilliSecs = 1;
536	else
537	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
538	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
539	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
540	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
541	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
542	if (rc == VERR_TIMEOUT)
543	rc = VINF_SUCCESS;
544	else if (RT_FAILURE(rc))
545	{
546	AssertRC(rc != VERR_INTERRUPTED);
547	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
548	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
549	VM_FF_SET(pVM, VM_FF_TERMINATE);
550	rc = VERR_INTERNAL_ERROR;
551	break;
552	}
553
554	/*
555	* Calc the statistics.
556	* Update averages every 16th time, and flush parts of the history every 64th time.
557	*/
558	const uint64_t Elapsed = RTTimeNanoTS() - Start;
559	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
560	if (Elapsed > u64NanoTS)
561	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
562	pUVCpu->vm.s.Halt.Method12.cBlocks++;
563	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
564	{
565	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
566	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
567	{
568	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
569	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
570	}
571	}
572	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
573
574	/*
575	* Clear the block once flag if we actually blocked.
576	*/
577	if ( fBlockOnce
578	&& Elapsed > 100000 /* 0.1 ms */)
579	fBlockOnce = false;
580	}
581	}
582	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
583
584	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
585	return rc;
586	}
587
588
589	/**
590	* Initialize the global 1 halt method.
591	*
592	* @return VBox status code.
593	* @param pUVM Pointer to the user mode VM structure.
594	*/
595	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
596	{
597	return VINF_SUCCESS;
598	}
599
600
601	/**
602	* The global 1 halt method - Block in GMM (ring-0) and let it
603	* try take care of the global scheduling of EMT threads.
604	*/
605	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
606	{
607	PUVM pUVM = pUVCpu->pUVM;
608	PVMCPU pVCpu = pUVCpu->pVCpu;
609	PVM pVM = pUVCpu->pVM;
610	Assert(VMMGetCpu(pVM) == pVCpu);
611
612	/*
613	* Halt loop.
614	*/
615	int rc = VINF_SUCCESS;
616	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
617	unsigned cLoops = 0;
618	for (;; cLoops++)
619	{
620	/*
621	* Work the timers and check if we can exit.
622	*/
623	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
624	TMR3TimerQueuesDo(pVM);
625	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
626	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
627	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
628	break;
629
630	/*
631	* Estimate time left to the next event.
632	*/
633	uint64_t u64Delta;
634	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
635	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
636	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
637	break;
638
639	/*
640	* Block if we're not spinning and the interval isn't all that small.
641	*/
642	if (u64Delta > 50000 /* 0.050ms */)
643	{
644	VMMR3YieldStop(pVM);
645	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
646	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
647	break;
648
649	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
650	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, c);
651	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
652	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, c);
653	if (rc == VERR_INTERRUPTED)
654	rc = VINF_SUCCESS;
655	else if (RT_FAILURE(rc))
656	{
657	AssertMsgFailed(("VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc));
658	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
659	VM_FF_SET(pVM, VM_FF_TERMINATE);
660	rc = VERR_INTERNAL_ERROR;
661	break;
662	}
663	}
664	/*
665	* When spinning call upon the GVMM and do some wakups once
666	* in a while, it's not like we're actually busy or anything.
667	*/
668	else if (!(cLoops & 0x1fff))
669	{
670	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, d);
671	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
672	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, d);
673	}
674	}
675	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
676
677	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
678	return rc;
679	}
680
681
682	/**
683	* The global 1 halt method - VMR3Wait() worker.
684	*
685	* @returns VBox status code.
686	* @param pUVCpu Pointer to the user mode VMCPU structure.
687	*/
688	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
689	{
690	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
691
692	PVM pVM = pUVCpu->pUVM->pVM;
693	PVMCPU pVCpu = VMMGetCpu(pVM);
694	Assert(pVCpu->idCpu == pUVCpu->idCpu);
695
696	int rc = VINF_SUCCESS;
697	for (;;)
698	{
699	/*
700	* Check Relevant FFs.
701	*/
702	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
703	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
704	break;
705
706	/*
707	* Wait for a while. Someone will wake us up or interrupt the call if
708	* anything needs our attention.
709	*/
710	rc = SUPCallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
711	if (rc == VERR_INTERRUPTED)
712	rc = VINF_SUCCESS;
713	else if (RT_FAILURE(rc))
714	{
715	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
716	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
717	VM_FF_SET(pVM, VM_FF_TERMINATE);
718	rc = VERR_INTERNAL_ERROR;
719	break;
720	}
721
722	}
723
724	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
725	return rc;
726	}
727
728
729	/**
730	* The global 1 halt method - VMR3NotifyFF() worker.
731	*
732	* @param pUVCpu Pointer to the user mode VMCPU structure.
733	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
734	*/
735	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
736	{
737	if (pUVCpu->vm.s.fWait)
738	{
739	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
740	AssertRC(rc);
741	}
742	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
743	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
744	&& pUVCpu->pVCpu)
745	{
746	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
747	if (enmState == VMCPUSTATE_STARTED_EXEC)
748	{
749	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
750	{
751	int rc = SUPCallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
752	AssertRC(rc);
753	}
754	}
755	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
756	{
757	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
758	REMR3NotifyFF(pUVCpu->pVM);
759	}
760	}
761	}
762
763
764	/**
765	* Bootstrap VMR3Wait() worker.
766	*
767	* @returns VBox status code.
768	* @param pUVMCPU Pointer to the user mode VMCPU structure.
769	*/
770	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
771	{
772	PUVM pUVM = pUVCpu->pUVM;
773
774	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
775
776	int rc = VINF_SUCCESS;
777	for (;;)
778	{
779	/*
780	* Check Relevant FFs.
781	*/
782	if (pUVM->vm.s.pReqs) /* global requests pending? */
783	break;
784	if (pUVCpu->vm.s.pReqs) /* local requests pending? */
785	break;
786
787	if ( pUVCpu->pVM
788	&& ( VM_FF_ISPENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
789	\|\| VMCPU_FF_ISPENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
790	)
791	)
792	break;
793	if (pUVCpu->vm.s.fTerminateEMT)
794	break;
795
796	/*
797	* Wait for a while. Someone will wake us up or interrupt the call if
798	* anything needs our attention.
799	*/
800	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
801	if (rc == VERR_TIMEOUT)
802	rc = VINF_SUCCESS;
803	else if (RT_FAILURE(rc))
804	{
805	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
806	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
807	if (pUVCpu->pVM)
808	VM_FF_SET(pUVCpu->pVM, VM_FF_TERMINATE);
809	rc = VERR_INTERNAL_ERROR;
810	break;
811	}
812
813	}
814
815	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
816	return rc;
817	}
818
819
820	/**
821	* Bootstrap VMR3NotifyFF() worker.
822	*
823	* @param pUVCpu Pointer to the user mode VMCPU structure.
824	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
825	*/
826	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
827	{
828	if (pUVCpu->vm.s.fWait)
829	{
830	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
831	AssertRC(rc);
832	}
833	NOREF(fFlags);
834	}
835
836
837	/**
838	* Default VMR3Wait() worker.
839	*
840	* @returns VBox status code.
841	* @param pUVMCPU Pointer to the user mode VMCPU structure.
842	*/
843	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
844	{
845	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
846
847	PVM pVM = pUVCpu->pVM;
848	PVMCPU pVCpu = pUVCpu->pVCpu;
849	int rc = VINF_SUCCESS;
850	for (;;)
851	{
852	/*
853	* Check Relevant FFs.
854	*/
855	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
856	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
857	break;
858
859	/*
860	* Wait for a while. Someone will wake us up or interrupt the call if
861	* anything needs our attention.
862	*/
863	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
864	if (rc == VERR_TIMEOUT)
865	rc = VINF_SUCCESS;
866	else if (RT_FAILURE(rc))
867	{
868	AssertMsgFailed(("RTSemEventWait->%Rrc\n", rc));
869	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fTerminateEMT, true);
870	VM_FF_SET(pVM, VM_FF_TERMINATE);
871	rc = VERR_INTERNAL_ERROR;
872	break;
873	}
874
875	}
876
877	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
878	return rc;
879	}
880
881
882	/**
883	* Default VMR3NotifyFF() worker.
884	*
885	* @param pUVCpu Pointer to the user mode VMCPU structure.
886	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
887	*/
888	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
889	{
890	if (pUVCpu->vm.s.fWait)
891	{
892	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
893	AssertRC(rc);
894	}
895	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
896	&& pUVCpu->pVCpu
897	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
898	REMR3NotifyFF(pUVCpu->pVM);
899	}
900
901
902	/**
903	* Array with halt method descriptors.
904	* VMINT::iHaltMethod contains an index into this array.
905	*/
906	static const struct VMHALTMETHODDESC
907	{
908	/** The halt method id. */
909	VMHALTMETHOD enmHaltMethod;
910	/** The init function for loading config and initialize variables. */
911	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
912	/** The term function. */
913	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
914	/** The VMR3WaitHaltedU function. */
915	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
916	/** The VMR3WaitU function. */
917	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
918	/** The VMR3NotifyCpuFFU function. */
919	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
920	/** The VMR3NotifyGlobalFFU function. */
921	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
922	} g_aHaltMethods[] =
923	{
924	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
925	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
926	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
927	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
928	};
929
930
931	/**
932	* Notify the emulation thread (EMT) about pending Forced Action (FF).
933	*
934	* This function is called by thread other than EMT to make
935	* sure EMT wakes up and promptly service an FF request.
936	*
937	* @param pUVM Pointer to the user mode VM structure.
938	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
939	*/
940	VMMR3DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
941	{
942	LogFlow(("VMR3NotifyGlobalFFU:\n"));
943	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
944
945	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
946	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
947	else
948	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
949	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
950	}
951
952
953	/**
954	* Notify the emulation thread (EMT) about pending Forced Action (FF).
955	*
956	* This function is called by thread other than EMT to make
957	* sure EMT wakes up and promptly service an FF request.
958	*
959	* @param pUVM Pointer to the user mode VM structure.
960	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
961	*/
962	VMMR3DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
963	{
964	PUVM pUVM = pUVCpu->pUVM;
965
966	LogFlow(("VMR3NotifyCpuFFU:\n"));
967	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
968	}
969
970
971	/**
972	* Halted VM Wait.
973	* Any external event will unblock the thread.
974	*
975	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
976	* case an appropriate status code is returned.
977	* @param pVM VM handle.
978	* @param pVCpu VMCPU handle.
979	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
980	* @thread The emulation thread.
981	*/
982	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
983	{
984	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
985
986	/*
987	* Check Relevant FFs.
988	*/
989	const uint32_t fMask = !fIgnoreInterrupts
990	? VMCPU_FF_EXTERNAL_HALTED_MASK
991	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
992	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
993	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
994	{
995	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
996	return VINF_SUCCESS;
997	}
998
999	/*
1000	* The yielder is suspended while we're halting, while TM might have clock(s) running
1001	* only at certain times and need to be notified..
1002	*/
1003	if (pVCpu->idCpu == 0)
1004	VMMR3YieldSuspend(pVM);
1005	TMNotifyStartOfHalt(pVCpu);
1006
1007	/*
1008	* Record halt averages for the last second.
1009	*/
1010	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1011	uint64_t u64Now = RTTimeNanoTS();
1012	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1013	if (off > 1000000000)
1014	{
1015	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1016	{
1017	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1018	pUVCpu->vm.s.HaltFrequency = 1;
1019	}
1020	else
1021	{
1022	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1023	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1024	}
1025	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1026	pUVCpu->vm.s.cHalts = 0;
1027	}
1028	pUVCpu->vm.s.cHalts++;
1029
1030	/*
1031	* Do the halt.
1032	*/
1033	Assert(VMCPU_GET_STATE(pVCpu) == VMCPUSTATE_STARTED);
1034	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1035	PUVM pUVM = pUVCpu->pUVM;
1036	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1037	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1038
1039	/*
1040	* Notify TM and resume the yielder
1041	*/
1042	TMNotifyEndOfHalt(pVCpu);
1043	if (pVCpu->idCpu == 0)
1044	VMMR3YieldResume(pVM);
1045
1046	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1047	return rc;
1048	}
1049
1050
1051	/**
1052	* Suspended VM Wait.
1053	* Only a handful of forced actions will cause the function to
1054	* return to the caller.
1055	*
1056	* @returns VINF_SUCCESS unless a fatal error occured. In the latter
1057	* case an appropriate status code is returned.
1058	* @param pUVCpu Pointer to the user mode VMCPU structure.
1059	* @thread The emulation thread.
1060	*/
1061	VMMR3DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1062	{
1063	LogFlow(("VMR3WaitU:\n"));
1064
1065	/*
1066	* Check Relevant FFs.
1067	*/
1068	PVM pVM = pUVCpu->pVM;
1069	PVMCPU pVCpu = pUVCpu->pVCpu;
1070
1071	if ( pVM
1072	&& ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1073	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1074	)
1075	)
1076	{
1077	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1078	return VINF_SUCCESS;
1079	}
1080
1081	/*
1082	* Do waiting according to the halt method (so VMR3NotifyFF
1083	* doesn't have to special case anything).
1084	*/
1085	PUVM pUVM = pUVCpu->pUVM;
1086	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1087	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pVM ? pVM->fGlobalForcedActions : 0));
1088	return rc;
1089	}
1090
1091
1092	/**
1093	* Rendezvous callback that will be called once.
1094	*
1095	* @returns VBox status code.
1096	* @param pVM VM handle.
1097	* @param pVCpu The VMCPU handle for the calling EMT.
1098	* @param pvUser The new g_aHaltMethods index.
1099	*/
1100	static DECLCALLBACK(int) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1101	{
1102	PUVM pUVM = pVM->pUVM;
1103	uintptr_t i = (uintptr_t)pvUser;
1104	Assert(i < RT_ELEMENTS(g_aHaltMethods));
1105	NOREF(pVCpu);
1106
1107	/*
1108	* Terminate the old one.
1109	*/
1110	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1111	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1112	{
1113	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1114	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1115	}
1116
1117	/* Assert that the failure fallback is where we expect. */
1118	Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1119	Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1120
1121	/*
1122	* Init the new one.
1123	*/
1124	int rc = VINF_SUCCESS;
1125	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1126	if (g_aHaltMethods[i].pfnInit)
1127	{
1128	rc = g_aHaltMethods[i].pfnInit(pUVM);
1129	if (RT_FAILURE(rc))
1130	{
1131	/* Fall back on the bootstrap method. This requires no
1132	init/term (see assertion above), and will always work. */
1133	AssertLogRelRC(rc);
1134	i = 0;
1135	}
1136	}
1137
1138	/*
1139	* Commit it.
1140	*/
1141	pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1142	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1143
1144	return rc;
1145	}
1146
1147
1148	/**
1149	* Changes the halt method.
1150	*
1151	* @returns VBox status code.
1152	* @param pUVM Pointer to the user mode VM structure.
1153	* @param enmHaltMethod The new halt method.
1154	* @thread EMT.
1155	*/
1156	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1157	{
1158	PVM pVM = pUVM->pVM; Assert(pVM);
1159	VM_ASSERT_EMT(pVM);
1160	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1161
1162	/*
1163	* Resolve default (can be overridden in the configuration).
1164	*/
1165	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1166	{
1167	uint32_t u32;
1168	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1169	if (RT_SUCCESS(rc))
1170	{
1171	enmHaltMethod = (VMHALTMETHOD)u32;
1172	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1173	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1174	}
1175	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1176	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1177	else
1178	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1179	//enmHaltMethod = VMHALTMETHOD_1;
1180	//enmHaltMethod = VMHALTMETHOD_OLD;
1181	}
1182	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1183
1184	/*
1185	* Find the descriptor.
1186	*/
1187	unsigned i = 0;
1188	while ( i < RT_ELEMENTS(g_aHaltMethods)
1189	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1190	i++;
1191	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1192
1193	/*
1194	* This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1195	*/
1196	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1197	}
1198

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 20855

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