VMEmt.cpp@ 32181

Last change on this file since 32181 was 30473, checked in by vboxsync, 14 years ago
VMM: First shot at the fatal error misbehavior (PAE).
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1	/* $Id: VMEmt.cpp 30473 2010-06-28 15:45:22Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_VM
23	#include <VBox/tm.h>
24	#include <VBox/dbgf.h>
25	#include <VBox/em.h>
26	#include <VBox/pdmapi.h>
27	#include <VBox/rem.h>
28	#include <VBox/tm.h>
29	#include "VMInternal.h"
30	#include <VBox/vm.h>
31	#include <VBox/uvm.h>
32
33	#include <VBox/err.h>
34	#include <VBox/log.h>
35	#include <iprt/assert.h>
36	#include <iprt/asm.h>
37	#include <iprt/asm-math.h>
38	#include <iprt/semaphore.h>
39	#include <iprt/string.h>
40	#include <iprt/thread.h>
41	#include <iprt/time.h>
42
43
44	/*******************************************************************************
45	* Internal Functions *
46	*******************************************************************************/
47	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu);
48
49
50	/**
51	* The emulation thread main function.
52	*
53	* @returns Thread exit code.
54	* @param ThreadSelf The handle to the executing thread.
55	* @param pvArgs Pointer to the user mode per-VCpu structure (UVMPCU).
56	*/
57	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
58	{
59	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
60	return vmR3EmulationThreadWithId(ThreadSelf, pUVCpu, pUVCpu->idCpu);
61	}
62
63
64	/**
65	* The emulation thread main function, with Virtual CPU ID for debugging.
66	*
67	* @returns Thread exit code.
68	* @param ThreadSelf The handle to the executing thread.
69	* @param pUVCpu Pointer to the user mode per-VCpu structure.
70	* @param idCpu The virtual CPU ID, for backtrace purposes.
71	*/
72	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu)
73	{
74	PUVM pUVM = pUVCpu->pUVM;
75	int rc;
76
77	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
78	("Invalid arguments to the emulation thread!\n"));
79
80	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVCpu);
81	AssertReleaseMsgRCReturn(rc, ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
82
83	/*
84	* The request loop.
85	*/
86	rc = VINF_SUCCESS;
87	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
88	VMSTATE enmBefore = VMSTATE_CREATED; /* (only used for logging atm.) */
89	for (;;)
90	{
91	/*
92	* During early init there is no pVM, so make a special path
93	* for that to keep things clearly separate.
94	*/
95	if (!pUVM->pVM)
96	{
97	/*
98	* Check for termination first.
99	*/
100	if (pUVM->vm.s.fTerminateEMT)
101	{
102	rc = VINF_EM_TERMINATE;
103	break;
104	}
105
106	/*
107	* Only the first VCPU may initialize the VM during early init
108	* and must therefore service all VMCPUID_ANY requests.
109	* See also VMR3Create
110	*/
111	if ( pUVM->vm.s.pReqs
112	&& pUVCpu->idCpu == 0)
113	{
114	/*
115	* Service execute in any EMT request.
116	*/
117	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY);
118	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
119	}
120	else if (pUVCpu->vm.s.pReqs)
121	{
122	/*
123	* Service execute in specific EMT request.
124	*/
125	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu);
126	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
127	}
128	else
129	{
130	/*
131	* Nothing important is pending, so wait for something.
132	*/
133	rc = VMR3WaitU(pUVCpu);
134	if (RT_FAILURE(rc))
135	{
136	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
137	break;
138	}
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 (pUVM->vm.s.fTerminateEMT)
152	{
153	rc = VINF_EM_TERMINATE;
154	break;
155	}
156
157	if (VM_FF_ISPENDING(pVM, VM_FF_EMT_RENDEZVOUS))
158	{
159	rc = VMMR3EmtRendezvousFF(pVM, &pVM->aCpus[idCpu]);
160	Log(("vmR3EmulationThread: Rendezvous rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
161	}
162	else 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 %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(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 %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), VMR3GetStateName(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 %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
185	}
186	else if (VM_FF_TESTANDCLEAR(pVM, VM_FF_RESET))
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 %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(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	{
203	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
204	break;
205	}
206	}
207
208	/*
209	* Check for termination requests, these have extremely high priority.
210	*/
211	if ( rc == VINF_EM_TERMINATE
212	\|\| pUVM->vm.s.fTerminateEMT)
213	break;
214	}
215
216	/*
217	* Some requests (both VMR3Req* and the DBGF) can potentially resume
218	* or start the VM, in that case we'll get a change in VM status
219	* indicating that we're now running.
220	*/
221	if ( RT_SUCCESS(rc)
222	&& pUVM->pVM)
223	{
224	PVM pVM = pUVM->pVM;
225	PVMCPU pVCpu = &pVM->aCpus[idCpu];
226	if ( pVM->enmVMState == VMSTATE_RUNNING
227	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
228	{
229	rc = EMR3ExecuteVM(pVM, pVCpu);
230	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
231	if (EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION)
232	vmR3SetGuruMeditation(pVM);
233	}
234	}
235
236	} /* forever */
237
238
239	/*
240	* Cleanup and exit.
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 ( idCpu == 0
245	&& pUVM->pVM)
246	{
247	PVM pVM = pUVM->pVM;
248	vmR3SetTerminated(pVM);
249	pUVM->pVM = NULL;
250
251	/** @todo SMP: This isn't 100% safe. We should wait for the other
252	* threads to finish before destroy the VM. */
253	int rc2 = SUPR3CallVMMR0Ex(pVM->pVMR0, 0 /idCpu/, VMMR0_DO_GVMM_DESTROY_VM, 0, NULL);
254	AssertLogRelRC(rc2);
255	}
256
257	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
258	Log(("vmR3EmulationThread: EMT is terminated.\n"));
259	return rc;
260	}
261
262
263	/**
264	* Gets the name of a halt method.
265	*
266	* @returns Pointer to a read only string.
267	* @param enmMethod The method.
268	*/
269	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
270	{
271	switch (enmMethod)
272	{
273	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
274	case VMHALTMETHOD_DEFAULT: return "default";
275	case VMHALTMETHOD_OLD: return "old";
276	case VMHALTMETHOD_1: return "method1";
277	//case VMHALTMETHOD_2: return "method2";
278	case VMHALTMETHOD_GLOBAL_1: return "global1";
279	default: return "unknown";
280	}
281	}
282
283
284	/**
285	* Signal a fatal wait error.
286	*
287	* @returns Fatal error code to be propagated up the call stack.
288	* @param pUVCpu The user mode per CPU structure of the calling
289	* EMT.
290	* @param pszFmt The error format with a single %Rrc in it.
291	* @param rcFmt The status code to format.
292	*/
293	static int vmR3FatalWaitError(PUVMCPU pUVCpu, const char *pszFmt, int rcFmt)
294	{
295	/** @todo This is wrong ... raise a fatal error / guru meditation
296	* instead. */
297	AssertLogRelMsgFailed((pszFmt, rcFmt));
298	ASMAtomicUoWriteBool(&pUVCpu->pUVM->vm.s.fTerminateEMT, true);
299	if (pUVCpu->pVM)
300	VM_FF_SET(pUVCpu->pVM, VM_FF_CHECK_VM_STATE);
301	return VERR_INTERNAL_ERROR;
302	}
303
304
305	/**
306	* The old halt loop.
307	*/
308	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
309	{
310	/*
311	* Halt loop.
312	*/
313	PVM pVM = pUVCpu->pVM;
314	PVMCPU pVCpu = pUVCpu->pVCpu;
315
316	int rc = VINF_SUCCESS;
317	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
318	//unsigned cLoops = 0;
319	for (;;)
320	{
321	/*
322	* Work the timers and check if we can exit.
323	* The poll call gives us the ticks left to the next event in
324	* addition to perhaps set an FF.
325	*/
326	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
327	TMR3TimerQueuesDo(pVM);
328	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
329	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
330	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
331	break;
332	uint64_t u64NanoTS;
333	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
334	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
335	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
336	break;
337
338	/*
339	* Wait for a while. Someone will wake us up or interrupt the call if
340	* anything needs our attention.
341	*/
342	if (u64NanoTS < 50000)
343	{
344	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
345	/* spin */;
346	}
347	else
348	{
349	VMMR3YieldStop(pVM);
350	//uint64_t u64Start = RTTimeNanoTS();
351	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
352	{
353	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
354	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, a);
355	RTThreadYield(); /* this is the best we can do here */
356	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, a);
357	}
358	else if (u64NanoTS < 2000000)
359	{
360	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
361	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
362	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
363	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
364	}
365	else
366	{
367	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
368	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
369	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
370	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
371	}
372	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
373	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
374	}
375	if (rc == VERR_TIMEOUT)
376	rc = VINF_SUCCESS;
377	else if (RT_FAILURE(rc))
378	{
379	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
380	break;
381	}
382	}
383
384	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
385	return rc;
386	}
387
388
389	/**
390	* Initialize the configuration of halt method 1 & 2.
391	*
392	* @return VBox status code. Failure on invalid CFGM data.
393	* @param pVM The VM handle.
394	*/
395	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
396	{
397	/*
398	* The defaults.
399	*/
400	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
401	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
402	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
403	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
404	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
405	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
406	#else
407	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
408	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
409	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
410	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
411	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
412	#endif
413
414	/*
415	* Query overrides.
416	*
417	* I don't have time to bother with niceities such as invalid value checks
418	* here right now. sorry.
419	*/
420	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
421	if (pCfg)
422	{
423	uint32_t u32;
424	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
425	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
426	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
427	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
428	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
429	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
430	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
431	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
432	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
433	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
434	LogRel(("HaltedMethod1 config: %d/%d/%d/%d/%d\n",
435	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
436	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
437	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
438	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
439	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
440	}
441
442	return VINF_SUCCESS;
443	}
444
445
446	/**
447	* Initialize halt method 1.
448	*
449	* @return VBox status code.
450	* @param pUVM Pointer to the user mode VM structure.
451	*/
452	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
453	{
454	return vmR3HaltMethod12ReadConfigU(pUVM);
455	}
456
457
458	/**
459	* Method 1 - Block whenever possible, and when lagging behind
460	* switch to spinning for 10-30ms with occational blocking until
461	* the lag has been eliminated.
462	*/
463	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
464	{
465	PUVM pUVM = pUVCpu->pUVM;
466	PVMCPU pVCpu = pUVCpu->pVCpu;
467	PVM pVM = pUVCpu->pVM;
468
469	/*
470	* To simplify things, we decide up-front whether we should switch to spinning or
471	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
472	* and that it will generate interrupts or other events that will cause us to exit
473	* the halt loop.
474	*/
475	bool fBlockOnce = false;
476	bool fSpinning = false;
477	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
478	if (u32CatchUpPct /* non-zero if catching up */)
479	{
480	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
481	{
482	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
483	if (fSpinning)
484	{
485	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
486	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
487	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
488	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
489	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
490	}
491	else
492	{
493	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
494	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
495	}
496	}
497	else
498	{
499	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
500	if (fSpinning)
501	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
502	}
503	}
504	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
505	{
506	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
507	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
508	}
509
510	/*
511	* Halt loop.
512	*/
513	int rc = VINF_SUCCESS;
514	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
515	unsigned cLoops = 0;
516	for (;; cLoops++)
517	{
518	/*
519	* Work the timers and check if we can exit.
520	*/
521	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
522	TMR3TimerQueuesDo(pVM);
523	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
524	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
525	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
526	break;
527
528	/*
529	* Estimate time left to the next event.
530	*/
531	uint64_t u64NanoTS;
532	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
533	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
534	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
535	break;
536
537	/*
538	* Block if we're not spinning and the interval isn't all that small.
539	*/
540	if ( ( !fSpinning
541	\|\| fBlockOnce)
542	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
543	&& u64NanoTS >= 100000) /* 0.100 ms */
544	#else
545	&& u64NanoTS >= 250000) /* 0.250 ms */
546	#endif
547	{
548	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
549	VMMR3YieldStop(pVM);
550
551	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
552	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
553	cMilliSecs = 1;
554	else
555	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
556	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
557	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, a);
558	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
559	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, a);
560	if (rc == VERR_TIMEOUT)
561	rc = VINF_SUCCESS;
562	else if (RT_FAILURE(rc))
563	{
564	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
565	break;
566	}
567
568	/*
569	* Calc the statistics.
570	* Update averages every 16th time, and flush parts of the history every 64th time.
571	*/
572	const uint64_t Elapsed = RTTimeNanoTS() - Start;
573	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
574	if (Elapsed > u64NanoTS)
575	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
576	pUVCpu->vm.s.Halt.Method12.cBlocks++;
577	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
578	{
579	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
580	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
581	{
582	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
583	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
584	}
585	}
586	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
587
588	/*
589	* Clear the block once flag if we actually blocked.
590	*/
591	if ( fBlockOnce
592	&& Elapsed > 100000 /* 0.1 ms */)
593	fBlockOnce = false;
594	}
595	}
596	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
597
598	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
599	return rc;
600	}
601
602
603	/**
604	* Initialize the global 1 halt method.
605	*
606	* @return VBox status code.
607	* @param pUVM Pointer to the user mode VM structure.
608	*/
609	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
610	{
611	return VINF_SUCCESS;
612	}
613
614
615	/**
616	* The global 1 halt method - Block in GMM (ring-0) and let it
617	* try take care of the global scheduling of EMT threads.
618	*/
619	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
620	{
621	PUVM pUVM = pUVCpu->pUVM;
622	PVMCPU pVCpu = pUVCpu->pVCpu;
623	PVM pVM = pUVCpu->pVM;
624	Assert(VMMGetCpu(pVM) == pVCpu);
625
626	/*
627	* Halt loop.
628	*/
629	int rc = VINF_SUCCESS;
630	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
631	unsigned cLoops = 0;
632	for (;; cLoops++)
633	{
634	/*
635	* Work the timers and check if we can exit.
636	*/
637	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltTimers, b);
638	TMR3TimerQueuesDo(pVM);
639	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltTimers, b);
640	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
641	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
642	break;
643
644	/*
645	* Estimate time left to the next event.
646	*/
647	uint64_t u64Delta;
648	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
649	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
650	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
651	break;
652
653	/*
654	* Block if we're not spinning and the interval isn't all that small.
655	*/
656	if (u64Delta > 50000 /* 0.050ms */)
657	{
658	VMMR3YieldStop(pVM);
659	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
660	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
661	break;
662
663	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
664	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltBlock, c);
665	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
666	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltBlock, c);
667	if (rc == VERR_INTERRUPTED)
668	rc = VINF_SUCCESS;
669	else if (RT_FAILURE(rc))
670	{
671	rc = vmR3FatalWaitError(pUVCpu, "VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
672	break;
673	}
674	}
675	/*
676	* When spinning call upon the GVMM and do some wakups once
677	* in a while, it's not like we're actually busy or anything.
678	*/
679	else if (!(cLoops & 0x1fff))
680	{
681	STAM_REL_PROFILE_START(&pUVCpu->vm.s.StatHaltYield, d);
682	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
683	STAM_REL_PROFILE_STOP(&pUVCpu->vm.s.StatHaltYield, d);
684	}
685	}
686	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
687
688	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
689	return rc;
690	}
691
692
693	/**
694	* The global 1 halt method - VMR3Wait() worker.
695	*
696	* @returns VBox status code.
697	* @param pUVCpu Pointer to the user mode VMCPU structure.
698	*/
699	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
700	{
701	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
702
703	PVM pVM = pUVCpu->pUVM->pVM;
704	PVMCPU pVCpu = VMMGetCpu(pVM);
705	Assert(pVCpu->idCpu == pUVCpu->idCpu);
706
707	int rc = VINF_SUCCESS;
708	for (;;)
709	{
710	/*
711	* Check Relevant FFs.
712	*/
713	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
714	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
715	break;
716
717	/*
718	* Wait for a while. Someone will wake us up or interrupt the call if
719	* anything needs our attention.
720	*/
721	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
722	if (rc == VERR_INTERRUPTED)
723	rc = VINF_SUCCESS;
724	else if (RT_FAILURE(rc))
725	{
726	rc = vmR3FatalWaitError(pUVCpu, "VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
727	break;
728	}
729	}
730
731	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
732	return rc;
733	}
734
735
736	/**
737	* The global 1 halt method - VMR3NotifyFF() worker.
738	*
739	* @param pUVCpu Pointer to the user mode VMCPU structure.
740	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
741	*/
742	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
743	{
744	if (pUVCpu->vm.s.fWait)
745	{
746	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
747	AssertRC(rc);
748	}
749	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
750	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
751	&& pUVCpu->pVCpu)
752	{
753	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
754	if (enmState == VMCPUSTATE_STARTED_EXEC)
755	{
756	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
757	{
758	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
759	AssertRC(rc);
760	}
761	}
762	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
763	{
764	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
765	REMR3NotifyFF(pUVCpu->pVM);
766	}
767	}
768	}
769
770
771	/**
772	* Bootstrap VMR3Wait() worker.
773	*
774	* @returns VBox status code.
775	* @param pUVMCPU Pointer to the user mode VMCPU structure.
776	*/
777	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
778	{
779	PUVM pUVM = pUVCpu->pUVM;
780
781	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
782
783	int rc = VINF_SUCCESS;
784	for (;;)
785	{
786	/*
787	* Check Relevant FFs.
788	*/
789	if (pUVM->vm.s.pReqs) /* global requests pending? */
790	break;
791	if (pUVCpu->vm.s.pReqs) /* local requests pending? */
792	break;
793
794	if ( pUVCpu->pVM
795	&& ( VM_FF_ISPENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
796	\|\| VMCPU_FF_ISPENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
797	)
798	)
799	break;
800	if (pUVM->vm.s.fTerminateEMT)
801	break;
802
803	/*
804	* Wait for a while. Someone will wake us up or interrupt the call if
805	* anything needs our attention.
806	*/
807	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
808	if (rc == VERR_TIMEOUT)
809	rc = VINF_SUCCESS;
810	else if (RT_FAILURE(rc))
811	{
812	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
813	break;
814	}
815	}
816
817	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
818	return rc;
819	}
820
821
822	/**
823	* Bootstrap VMR3NotifyFF() worker.
824	*
825	* @param pUVCpu Pointer to the user mode VMCPU structure.
826	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
827	*/
828	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
829	{
830	if (pUVCpu->vm.s.fWait)
831	{
832	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
833	AssertRC(rc);
834	}
835	NOREF(fFlags);
836	}
837
838
839	/**
840	* Default VMR3Wait() worker.
841	*
842	* @returns VBox status code.
843	* @param pUVMCPU Pointer to the user mode VMCPU structure.
844	*/
845	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
846	{
847	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
848
849	PVM pVM = pUVCpu->pVM;
850	PVMCPU pVCpu = pUVCpu->pVCpu;
851	int rc = VINF_SUCCESS;
852	for (;;)
853	{
854	/*
855	* Check Relevant FFs.
856	*/
857	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
858	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
859	break;
860
861	/*
862	* Wait for a while. Someone will wake us up or interrupt the call if
863	* anything needs our attention.
864	*/
865	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
866	if (rc == VERR_TIMEOUT)
867	rc = VINF_SUCCESS;
868	else if (RT_FAILURE(rc))
869	{
870	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc", rc);
871	break;
872	}
873	}
874
875	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
876	return rc;
877	}
878
879
880	/**
881	* Default VMR3NotifyFF() worker.
882	*
883	* @param pUVCpu Pointer to the user mode VMCPU structure.
884	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
885	*/
886	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
887	{
888	if (pUVCpu->vm.s.fWait)
889	{
890	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
891	AssertRC(rc);
892	}
893	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
894	&& pUVCpu->pVCpu
895	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
896	REMR3NotifyFF(pUVCpu->pVM);
897	}
898
899
900	/**
901	* Array with halt method descriptors.
902	* VMINT::iHaltMethod contains an index into this array.
903	*/
904	static const struct VMHALTMETHODDESC
905	{
906	/** The halt method id. */
907	VMHALTMETHOD enmHaltMethod;
908	/** The init function for loading config and initialize variables. */
909	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
910	/** The term function. */
911	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
912	/** The VMR3WaitHaltedU function. */
913	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
914	/** The VMR3WaitU function. */
915	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
916	/** The VMR3NotifyCpuFFU function. */
917	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
918	/** The VMR3NotifyGlobalFFU function. */
919	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
920	} g_aHaltMethods[] =
921	{
922	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
923	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
924	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
925	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
926	};
927
928
929	/**
930	* Notify the emulation thread (EMT) about pending Forced Action (FF).
931	*
932	* This function is called by thread other than EMT to make
933	* sure EMT wakes up and promptly service an FF request.
934	*
935	* @param pUVM Pointer to the user mode VM structure.
936	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
937	*/
938	VMMR3DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
939	{
940	LogFlow(("VMR3NotifyGlobalFFU:\n"));
941	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
942
943	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
944	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
945	else
946	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
947	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
948	}
949
950
951	/**
952	* Notify the emulation thread (EMT) about pending Forced Action (FF).
953	*
954	* This function is called by thread other than EMT to make
955	* sure EMT wakes up and promptly service an FF request.
956	*
957	* @param pUVM Pointer to the user mode VM structure.
958	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
959	*/
960	VMMR3DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
961	{
962	PUVM pUVM = pUVCpu->pUVM;
963
964	LogFlow(("VMR3NotifyCpuFFU:\n"));
965	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
966	}
967
968
969	/**
970	* Halted VM Wait.
971	* Any external event will unblock the thread.
972	*
973	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
974	* case an appropriate status code is returned.
975	* @param pVM VM handle.
976	* @param pVCpu VMCPU handle.
977	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
978	* @thread The emulation thread.
979	*/
980	VMMR3DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
981	{
982	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
983
984	/*
985	* Check Relevant FFs.
986	*/
987	const uint32_t fMask = !fIgnoreInterrupts
988	? VMCPU_FF_EXTERNAL_HALTED_MASK
989	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
990	if ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
991	\|\| VMCPU_FF_ISPENDING(pVCpu, fMask))
992	{
993	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
994	return VINF_SUCCESS;
995	}
996
997	/*
998	* The yielder is suspended while we're halting, while TM might have clock(s) running
999	* only at certain times and need to be notified..
1000	*/
1001	if (pVCpu->idCpu == 0)
1002	VMMR3YieldSuspend(pVM);
1003	TMNotifyStartOfHalt(pVCpu);
1004
1005	/*
1006	* Record halt averages for the last second.
1007	*/
1008	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1009	uint64_t u64Now = RTTimeNanoTS();
1010	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1011	if (off > 1000000000)
1012	{
1013	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1014	{
1015	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1016	pUVCpu->vm.s.HaltFrequency = 1;
1017	}
1018	else
1019	{
1020	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1021	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1022	}
1023	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1024	pUVCpu->vm.s.cHalts = 0;
1025	}
1026	pUVCpu->vm.s.cHalts++;
1027
1028	/*
1029	* Do the halt.
1030	*/
1031	Assert(VMCPU_GET_STATE(pVCpu) == VMCPUSTATE_STARTED);
1032	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1033	PUVM pUVM = pUVCpu->pUVM;
1034	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1035	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1036
1037	/*
1038	* Notify TM and resume the yielder
1039	*/
1040	TMNotifyEndOfHalt(pVCpu);
1041	if (pVCpu->idCpu == 0)
1042	VMMR3YieldResume(pVM);
1043
1044	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1045	return rc;
1046	}
1047
1048
1049	/**
1050	* Suspended VM Wait.
1051	* Only a handful of forced actions will cause the function to
1052	* return to the caller.
1053	*
1054	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1055	* case an appropriate status code is returned.
1056	* @param pUVCpu Pointer to the user mode VMCPU structure.
1057	* @thread The emulation thread.
1058	*/
1059	VMMR3DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1060	{
1061	LogFlow(("VMR3WaitU:\n"));
1062
1063	/*
1064	* Check Relevant FFs.
1065	*/
1066	PVM pVM = pUVCpu->pVM;
1067	PVMCPU pVCpu = pUVCpu->pVCpu;
1068
1069	if ( pVM
1070	&& ( VM_FF_ISPENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1071	\|\| VMCPU_FF_ISPENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1072	)
1073	)
1074	{
1075	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1076	return VINF_SUCCESS;
1077	}
1078
1079	/*
1080	* Do waiting according to the halt method (so VMR3NotifyFF
1081	* doesn't have to special case anything).
1082	*/
1083	PUVM pUVM = pUVCpu->pUVM;
1084	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1085	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pVM ? pVM->fGlobalForcedActions : 0));
1086	return rc;
1087	}
1088
1089
1090	/**
1091	* Interface that PDMR3Suspend, PDMR3PowerOff and PDMR3Reset uses when they wait
1092	* for the handling of asynchronous notifications to complete.
1093	*
1094	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1095	* case an appropriate status code is returned.
1096	* @param pUVCpu Pointer to the user mode VMCPU structure.
1097	* @thread The emulation thread.
1098	*/
1099	VMMR3_INT_DECL(int) VMR3AsyncPdmNotificationWaitU(PUVMCPU pUVCpu)
1100	{
1101	LogFlow(("VMR3AsyncPdmNotificationWaitU:\n"));
1102	return VMR3WaitU(pUVCpu);
1103	}
1104
1105
1106	/**
1107	* Interface that PDM the helper asynchronous notification completed methods
1108	* uses for EMT0 when it is waiting inside VMR3AsyncPdmNotificationWaitU().
1109	*
1110	* @param pUVM Pointer to the user mode VM structure.
1111	*/
1112	VMMR3_INT_DECL(void) VMR3AsyncPdmNotificationWakeupU(PUVM pUVM)
1113	{
1114	LogFlow(("VMR3AsyncPdmNotificationWakeupU:\n"));
1115	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST); /* this will have to do for now. */
1116	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(&pUVM->aCpus[0], 0 /fFlags/);
1117	}
1118
1119
1120	/**
1121	* Rendezvous callback that will be called once.
1122	*
1123	* @returns VBox strict status code.
1124	* @param pVM VM handle.
1125	* @param pVCpu The VMCPU handle for the calling EMT.
1126	* @param pvUser The new g_aHaltMethods index.
1127	*/
1128	static DECLCALLBACK(VBOXSTRICTRC) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1129	{
1130	PUVM pUVM = pVM->pUVM;
1131	uintptr_t i = (uintptr_t)pvUser;
1132	Assert(i < RT_ELEMENTS(g_aHaltMethods));
1133	NOREF(pVCpu);
1134
1135	/*
1136	* Terminate the old one.
1137	*/
1138	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1139	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1140	{
1141	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1142	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1143	}
1144
1145	/* Assert that the failure fallback is where we expect. */
1146	Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1147	Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1148
1149	/*
1150	* Init the new one.
1151	*/
1152	int rc = VINF_SUCCESS;
1153	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1154	if (g_aHaltMethods[i].pfnInit)
1155	{
1156	rc = g_aHaltMethods[i].pfnInit(pUVM);
1157	if (RT_FAILURE(rc))
1158	{
1159	/* Fall back on the bootstrap method. This requires no
1160	init/term (see assertion above), and will always work. */
1161	AssertLogRelRC(rc);
1162	i = 0;
1163	}
1164	}
1165
1166	/*
1167	* Commit it.
1168	*/
1169	pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1170	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1171
1172	return rc;
1173	}
1174
1175
1176	/**
1177	* Changes the halt method.
1178	*
1179	* @returns VBox status code.
1180	* @param pUVM Pointer to the user mode VM structure.
1181	* @param enmHaltMethod The new halt method.
1182	* @thread EMT.
1183	*/
1184	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1185	{
1186	PVM pVM = pUVM->pVM; Assert(pVM);
1187	VM_ASSERT_EMT(pVM);
1188	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1189
1190	/*
1191	* Resolve default (can be overridden in the configuration).
1192	*/
1193	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1194	{
1195	uint32_t u32;
1196	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1197	if (RT_SUCCESS(rc))
1198	{
1199	enmHaltMethod = (VMHALTMETHOD)u32;
1200	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1201	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1202	}
1203	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1204	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1205	else
1206	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1207	//enmHaltMethod = VMHALTMETHOD_1;
1208	//enmHaltMethod = VMHALTMETHOD_OLD;
1209	}
1210	LogRel(("VM: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1211
1212	/*
1213	* Find the descriptor.
1214	*/
1215	unsigned i = 0;
1216	while ( i < RT_ELEMENTS(g_aHaltMethods)
1217	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1218	i++;
1219	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1220
1221	/*
1222	* This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1223	*/
1224	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1225	}
1226

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source: vbox/trunk/src/VBox/VMM/VMEmt.cpp@ 32181

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