VMEmt.cpp@ 57358

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1	/* $Id: VMEmt.cpp 57358 2015-08-14 15:16:38Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
4	*/
5
6	/*
7	* Copyright (C) 2006-2015 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/vmm/tm.h>
24	#include <VBox/vmm/dbgf.h>
25	#include <VBox/vmm/em.h>
26	#include <VBox/vmm/pdmapi.h>
27	#ifdef VBOX_WITH_REM
28	# include <VBox/vmm/rem.h>
29	#endif
30	#include <VBox/vmm/tm.h>
31	#include "VMInternal.h"
32	#include <VBox/vmm/vm.h>
33	#include <VBox/vmm/uvm.h>
34
35	#include <VBox/err.h>
36	#include <VBox/log.h>
37	#include <iprt/assert.h>
38	#include <iprt/asm.h>
39	#include <iprt/asm-math.h>
40	#include <iprt/semaphore.h>
41	#include <iprt/string.h>
42	#include <iprt/thread.h>
43	#include <iprt/time.h>
44
45
46	/*********************************************************************************************************************************
47	* Internal Functions *
48	*********************************************************************************************************************************/
49	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu);
50
51
52	/**
53	* The emulation thread main function.
54	*
55	* @returns Thread exit code.
56	* @param ThreadSelf The handle to the executing thread.
57	* @param pvArgs Pointer to the user mode per-VCpu structure (UVMPCU).
58	*/
59	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD ThreadSelf, void *pvArgs)
60	{
61	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
62	return vmR3EmulationThreadWithId(ThreadSelf, pUVCpu, pUVCpu->idCpu);
63	}
64
65
66	/**
67	* The emulation thread main function, with Virtual CPU ID for debugging.
68	*
69	* @returns Thread exit code.
70	* @param ThreadSelf The handle to the executing thread.
71	* @param pUVCpu Pointer to the user mode per-VCpu structure.
72	* @param idCpu The virtual CPU ID, for backtrace purposes.
73	*/
74	int vmR3EmulationThreadWithId(RTTHREAD ThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu)
75	{
76	PUVM pUVM = pUVCpu->pUVM;
77	int rc;
78
79	AssertReleaseMsg(VALID_PTR(pUVM) && pUVM->u32Magic == UVM_MAGIC,
80	("Invalid arguments to the emulation thread!\n"));
81
82	rc = RTTlsSet(pUVM->vm.s.idxTLS, pUVCpu);
83	AssertReleaseMsgRCReturn(rc, ("RTTlsSet %x failed with %Rrc\n", pUVM->vm.s.idxTLS, rc), rc);
84
85	if ( pUVM->pVmm2UserMethods
86	&& pUVM->pVmm2UserMethods->pfnNotifyEmtInit)
87	pUVM->pVmm2UserMethods->pfnNotifyEmtInit(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
88
89	/*
90	* The request loop.
91	*/
92	rc = VINF_SUCCESS;
93	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", ThreadSelf, pUVM));
94	VMSTATE enmBefore = VMSTATE_CREATED; /* (only used for logging atm.) */
95	for (;;)
96	{
97	/*
98	* During early init there is no pVM, so make a special path
99	* for that to keep things clearly separate.
100	*/
101	if (!pUVM->pVM)
102	{
103	/*
104	* Check for termination first.
105	*/
106	if (pUVM->vm.s.fTerminateEMT)
107	{
108	rc = VINF_EM_TERMINATE;
109	break;
110	}
111
112	/*
113	* Only the first VCPU may initialize the VM during early init
114	* and must therefore service all VMCPUID_ANY requests.
115	* See also VMR3Create
116	*/
117	if ( (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs)
118	&& pUVCpu->idCpu == 0)
119	{
120	/*
121	* Service execute in any EMT request.
122	*/
123	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /fPriorityOnly/);
124	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
125	}
126	else if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs)
127	{
128	/*
129	* Service execute in specific EMT request.
130	*/
131	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /fPriorityOnly/);
132	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
133	}
134	else
135	{
136	/*
137	* Nothing important is pending, so wait for something.
138	*/
139	rc = VMR3WaitU(pUVCpu);
140	if (RT_FAILURE(rc))
141	{
142	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
143	break;
144	}
145	}
146	}
147	else
148	{
149	/*
150	* Pending requests which needs servicing?
151	*
152	* We check for state changes in addition to status codes when
153	* servicing requests. (Look after the ifs.)
154	*/
155	PVM pVM = pUVM->pVM;
156	enmBefore = pVM->enmVMState;
157	if (pUVM->vm.s.fTerminateEMT)
158	{
159	rc = VINF_EM_TERMINATE;
160	break;
161	}
162
163	if (VM_FF_IS_PENDING(pVM, VM_FF_EMT_RENDEZVOUS))
164	{
165	rc = VMMR3EmtRendezvousFF(pVM, &pVM->aCpus[idCpu]);
166	Log(("vmR3EmulationThread: Rendezvous rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
167	}
168	else if (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs)
169	{
170	/*
171	* Service execute in any EMT request.
172	*/
173	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /fPriorityOnly/);
174	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
175	}
176	else if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs)
177	{
178	/*
179	* Service execute in specific EMT request.
180	*/
181	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /fPriorityOnly/);
182	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
183	}
184	else if (VM_FF_IS_SET(pVM, VM_FF_DBGF))
185	{
186	/*
187	* Service the debugger request.
188	*/
189	rc = DBGFR3VMMForcedAction(pVM);
190	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
191	}
192	else if (VM_FF_TEST_AND_CLEAR(pVM, VM_FF_RESET))
193	{
194	/*
195	* Service a delayed reset request.
196	*/
197	rc = VMR3Reset(pVM->pUVM);
198	VM_FF_CLEAR(pVM, VM_FF_RESET);
199	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
200	}
201	else
202	{
203	/*
204	* Nothing important is pending, so wait for something.
205	*/
206	rc = VMR3WaitU(pUVCpu);
207	if (RT_FAILURE(rc))
208	{
209	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
210	break;
211	}
212	}
213
214	/*
215	* Check for termination requests, these have extremely high priority.
216	*/
217	if ( rc == VINF_EM_TERMINATE
218	\|\| pUVM->vm.s.fTerminateEMT)
219	break;
220	}
221
222	/*
223	* Some requests (both VMR3Req* and the DBGF) can potentially resume
224	* or start the VM, in that case we'll get a change in VM status
225	* indicating that we're now running.
226	*/
227	if ( RT_SUCCESS(rc)
228	&& pUVM->pVM)
229	{
230	PVM pVM = pUVM->pVM;
231	PVMCPU pVCpu = &pVM->aCpus[idCpu];
232	if ( pVM->enmVMState == VMSTATE_RUNNING
233	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
234	{
235	rc = EMR3ExecuteVM(pVM, pVCpu);
236	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
237	if (EMGetState(pVCpu) == EMSTATE_GURU_MEDITATION)
238	vmR3SetGuruMeditation(pVM);
239	}
240	}
241
242	} /* forever */
243
244
245	/*
246	* Cleanup and exit.
247	*/
248	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
249	ThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
250	if ( idCpu == 0
251	&& pUVM->pVM)
252	{
253	PVM pVM = pUVM->pVM;
254	vmR3SetTerminated(pVM);
255	pUVM->pVM = NULL;
256
257	/** @todo SMP: This isn't 100% safe. We should wait for the other
258	* threads to finish before destroy the VM. */
259	int rc2 = SUPR3CallVMMR0Ex(pVM->pVMR0, 0 /idCpu/, VMMR0_DO_GVMM_DESTROY_VM, 0, NULL);
260	AssertLogRelRC(rc2);
261	}
262
263	if ( pUVM->pVmm2UserMethods
264	&& pUVM->pVmm2UserMethods->pfnNotifyEmtTerm)
265	pUVM->pVmm2UserMethods->pfnNotifyEmtTerm(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
266
267	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
268	Log(("vmR3EmulationThread: EMT is terminated.\n"));
269	return rc;
270	}
271
272
273	/**
274	* Gets the name of a halt method.
275	*
276	* @returns Pointer to a read only string.
277	* @param enmMethod The method.
278	*/
279	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
280	{
281	switch (enmMethod)
282	{
283	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
284	case VMHALTMETHOD_DEFAULT: return "default";
285	case VMHALTMETHOD_OLD: return "old";
286	case VMHALTMETHOD_1: return "method1";
287	//case VMHALTMETHOD_2: return "method2";
288	case VMHALTMETHOD_GLOBAL_1: return "global1";
289	default: return "unknown";
290	}
291	}
292
293
294	/**
295	* Signal a fatal wait error.
296	*
297	* @returns Fatal error code to be propagated up the call stack.
298	* @param pUVCpu The user mode per CPU structure of the calling
299	* EMT.
300	* @param pszFmt The error format with a single %Rrc in it.
301	* @param rcFmt The status code to format.
302	*/
303	static int vmR3FatalWaitError(PUVMCPU pUVCpu, const char *pszFmt, int rcFmt)
304	{
305	/** @todo This is wrong ... raise a fatal error / guru meditation
306	* instead. */
307	AssertLogRelMsgFailed((pszFmt, rcFmt));
308	ASMAtomicUoWriteBool(&pUVCpu->pUVM->vm.s.fTerminateEMT, true);
309	if (pUVCpu->pVM)
310	VM_FF_SET(pUVCpu->pVM, VM_FF_CHECK_VM_STATE);
311	return VERR_VM_FATAL_WAIT_ERROR;
312	}
313
314
315	/**
316	* The old halt loop.
317	*/
318	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
319	{
320	/*
321	* Halt loop.
322	*/
323	PVM pVM = pUVCpu->pVM;
324	PVMCPU pVCpu = pUVCpu->pVCpu;
325
326	int rc = VINF_SUCCESS;
327	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
328	//unsigned cLoops = 0;
329	for (;;)
330	{
331	/*
332	* Work the timers and check if we can exit.
333	* The poll call gives us the ticks left to the next event in
334	* addition to perhaps set an FF.
335	*/
336	uint64_t const u64StartTimers = RTTimeNanoTS();
337	TMR3TimerQueuesDo(pVM);
338	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
339	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
340	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
341	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
342	break;
343	uint64_t u64NanoTS;
344	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
345	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
346	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
347	break;
348
349	/*
350	* Wait for a while. Someone will wake us up or interrupt the call if
351	* anything needs our attention.
352	*/
353	if (u64NanoTS < 50000)
354	{
355	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
356	/* spin */;
357	}
358	else
359	{
360	VMMR3YieldStop(pVM);
361	//uint64_t u64Start = RTTimeNanoTS();
362	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
363	{
364	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
365	uint64_t const u64StartSchedYield = RTTimeNanoTS();
366	RTThreadYield(); /* this is the best we can do here */
367	uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
368	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
369	}
370	else if (u64NanoTS < 2000000)
371	{
372	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
373	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
374	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
375	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
376	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
377	}
378	else
379	{
380	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
381	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
382	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
383	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
384	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
385	}
386	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
387	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
388	}
389	if (rc == VERR_TIMEOUT)
390	rc = VINF_SUCCESS;
391	else if (RT_FAILURE(rc))
392	{
393	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
394	break;
395	}
396	}
397
398	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
399	return rc;
400	}
401
402
403	/**
404	* Initialize the configuration of halt method 1 & 2.
405	*
406	* @return VBox status code. Failure on invalid CFGM data.
407	* @param pVM Pointer to the VM.
408	*/
409	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
410	{
411	/*
412	* The defaults.
413	*/
414	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
415	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
416	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
417	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
418	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
419	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
420	#else
421	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
422	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
423	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
424	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
425	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
426	#endif
427
428	/*
429	* Query overrides.
430	*
431	* I don't have time to bother with niceties such as invalid value checks
432	* here right now. sorry.
433	*/
434	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
435	if (pCfg)
436	{
437	uint32_t u32;
438	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
439	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
440	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
441	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
442	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
443	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
444	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
445	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
446	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
447	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
448	LogRel(("VMEmt: HaltedMethod1 config: %d/%d/%d/%d/%d\n",
449	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
450	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
451	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
452	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
453	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
454	}
455
456	return VINF_SUCCESS;
457	}
458
459
460	/**
461	* Initialize halt method 1.
462	*
463	* @return VBox status code.
464	* @param pUVM Pointer to the user mode VM structure.
465	*/
466	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
467	{
468	return vmR3HaltMethod12ReadConfigU(pUVM);
469	}
470
471
472	/**
473	* Method 1 - Block whenever possible, and when lagging behind
474	* switch to spinning for 10-30ms with occasional blocking until
475	* the lag has been eliminated.
476	*/
477	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
478	{
479	PUVM pUVM = pUVCpu->pUVM;
480	PVMCPU pVCpu = pUVCpu->pVCpu;
481	PVM pVM = pUVCpu->pVM;
482
483	/*
484	* To simplify things, we decide up-front whether we should switch to spinning or
485	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
486	* and that it will generate interrupts or other events that will cause us to exit
487	* the halt loop.
488	*/
489	bool fBlockOnce = false;
490	bool fSpinning = false;
491	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
492	if (u32CatchUpPct /* non-zero if catching up */)
493	{
494	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
495	{
496	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
497	if (fSpinning)
498	{
499	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
500	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
501	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
502	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
503	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
504	}
505	else
506	{
507	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
508	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
509	}
510	}
511	else
512	{
513	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
514	if (fSpinning)
515	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
516	}
517	}
518	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
519	{
520	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
521	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
522	}
523
524	/*
525	* Halt loop.
526	*/
527	int rc = VINF_SUCCESS;
528	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
529	unsigned cLoops = 0;
530	for (;; cLoops++)
531	{
532	/*
533	* Work the timers and check if we can exit.
534	*/
535	uint64_t const u64StartTimers = RTTimeNanoTS();
536	TMR3TimerQueuesDo(pVM);
537	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
538	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
539	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
540	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
541	break;
542
543	/*
544	* Estimate time left to the next event.
545	*/
546	uint64_t u64NanoTS;
547	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
548	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
549	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
550	break;
551
552	/*
553	* Block if we're not spinning and the interval isn't all that small.
554	*/
555	if ( ( !fSpinning
556	\|\| fBlockOnce)
557	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
558	&& u64NanoTS >= 100000) /* 0.100 ms */
559	#else
560	&& u64NanoTS >= 250000) /* 0.250 ms */
561	#endif
562	{
563	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
564	VMMR3YieldStop(pVM);
565
566	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
567	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
568	cMilliSecs = 1;
569	else
570	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
571
572	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
573	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
574	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
575	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
576	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
577
578	if (rc == VERR_TIMEOUT)
579	rc = VINF_SUCCESS;
580	else if (RT_FAILURE(rc))
581	{
582	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
583	break;
584	}
585
586	/*
587	* Calc the statistics.
588	* Update averages every 16th time, and flush parts of the history every 64th time.
589	*/
590	const uint64_t Elapsed = RTTimeNanoTS() - Start;
591	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
592	if (Elapsed > u64NanoTS)
593	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
594	pUVCpu->vm.s.Halt.Method12.cBlocks++;
595	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
596	{
597	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
598	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
599	{
600	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
601	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
602	}
603	}
604	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
605
606	/*
607	* Clear the block once flag if we actually blocked.
608	*/
609	if ( fBlockOnce
610	&& Elapsed > 100000 /* 0.1 ms */)
611	fBlockOnce = false;
612	}
613	}
614	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
615
616	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
617	return rc;
618	}
619
620
621	/**
622	* Initialize the global 1 halt method.
623	*
624	* @return VBox status code.
625	* @param pUVM Pointer to the user mode VM structure.
626	*/
627	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
628	{
629	/*
630	* The defaults.
631	*/
632	uint32_t cNsResolution = SUPSemEventMultiGetResolution(pUVM->vm.s.pSession);
633	if (cNsResolution > 5*RT_NS_100US)
634	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 50000;
635	else if (cNsResolution > RT_NS_100US)
636	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = cNsResolution / 4;
637	else
638	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 2000;
639
640	/*
641	* Query overrides.
642	*
643	* I don't have time to bother with niceties such as invalid value checks
644	* here right now. sorry.
645	*/
646	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedGlobal1");
647	if (pCfg)
648	{
649	uint32_t u32;
650	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "SpinBlockThreshold", &u32)))
651	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = u32;
652	}
653	LogRel(("VMEmt: HaltedGlobal1 config: cNsSpinBlockThresholdCfg=%u\n",
654	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg));
655	return VINF_SUCCESS;
656	}
657
658
659	/**
660	* The global 1 halt method - Block in GMM (ring-0) and let it
661	* try take care of the global scheduling of EMT threads.
662	*/
663	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
664	{
665	PUVM pUVM = pUVCpu->pUVM;
666	PVMCPU pVCpu = pUVCpu->pVCpu;
667	PVM pVM = pUVCpu->pVM;
668	Assert(VMMGetCpu(pVM) == pVCpu);
669	NOREF(u64Now);
670
671	/*
672	* Halt loop.
673	*/
674	//uint64_t u64NowLog, u64Start;
675	//u64Start = u64NowLog = RTTimeNanoTS();
676	int rc = VINF_SUCCESS;
677	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
678	unsigned cLoops = 0;
679	for (;; cLoops++)
680	{
681	/*
682	* Work the timers and check if we can exit.
683	*/
684	uint64_t const u64StartTimers = RTTimeNanoTS();
685	TMR3TimerQueuesDo(pVM);
686	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
687	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
688	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
689	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
690	break;
691
692	/*
693	* Estimate time left to the next event.
694	*/
695	//u64NowLog = RTTimeNanoTS();
696	uint64_t u64Delta;
697	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
698	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
699	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
700	break;
701
702	/*
703	* Block if we're not spinning and the interval isn't all that small.
704	*/
705	if (u64Delta >= pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg)
706	{
707	VMMR3YieldStop(pVM);
708	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
709	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
710	break;
711
712	//RTLogPrintf("loop=%-3d u64GipTime=%'llu / %'llu now=%'llu / %'llu\n", cLoops, u64GipTime, u64Delta, u64NowLog, u64GipTime - u64NowLog);
713	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
714	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
715	uint64_t const u64EndSchedHalt = RTTimeNanoTS();
716	uint64_t const cNsElapsedSchedHalt = u64EndSchedHalt - u64StartSchedHalt;
717	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
718
719	if (rc == VERR_INTERRUPTED)
720	rc = VINF_SUCCESS;
721	else if (RT_FAILURE(rc))
722	{
723	rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Halt: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
724	break;
725	}
726	else
727	{
728	int64_t const cNsOverslept = u64EndSchedHalt - u64GipTime;
729	if (cNsOverslept > 50000)
730	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOverslept, cNsOverslept);
731	else if (cNsOverslept < -50000)
732	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockInsomnia, cNsElapsedSchedHalt);
733	else
734	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOnTime, cNsElapsedSchedHalt);
735	}
736	}
737	/*
738	* When spinning call upon the GVMM and do some wakups once
739	* in a while, it's not like we're actually busy or anything.
740	*/
741	else if (!(cLoops & 0x1fff))
742	{
743	uint64_t const u64StartSchedYield = RTTimeNanoTS();
744	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
745	uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
746	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
747	}
748	}
749	//RTLogPrintf("*** %u loops %'llu; lag=%RU64\n", cLoops, u64NowLog - u64Start, TMVirtualSyncGetLag(pVM));
750
751	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
752	return rc;
753	}
754
755
756	/**
757	* The global 1 halt method - VMR3Wait() worker.
758	*
759	* @returns VBox status code.
760	* @param pUVCpu Pointer to the user mode VMCPU structure.
761	*/
762	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
763	{
764	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
765
766	PVM pVM = pUVCpu->pUVM->pVM;
767	PVMCPU pVCpu = VMMGetCpu(pVM);
768	Assert(pVCpu->idCpu == pUVCpu->idCpu);
769
770	int rc = VINF_SUCCESS;
771	for (;;)
772	{
773	/*
774	* Check Relevant FFs.
775	*/
776	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
777	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
778	break;
779
780	/*
781	* Wait for a while. Someone will wake us up or interrupt the call if
782	* anything needs our attention.
783	*/
784	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
785	if (rc == VERR_INTERRUPTED)
786	rc = VINF_SUCCESS;
787	else if (RT_FAILURE(rc))
788	{
789	rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Wait: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
790	break;
791	}
792	}
793
794	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
795	return rc;
796	}
797
798
799	/**
800	* The global 1 halt method - VMR3NotifyFF() worker.
801	*
802	* @param pUVCpu Pointer to the user mode VMCPU structure.
803	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
804	*/
805	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
806	{
807	if (pUVCpu->vm.s.fWait)
808	{
809	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
810	AssertRC(rc);
811	}
812	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
813	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
814	&& pUVCpu->pVCpu)
815	{
816	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
817	if (enmState == VMCPUSTATE_STARTED_EXEC)
818	{
819	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
820	{
821	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
822	AssertRC(rc);
823	}
824	}
825	#ifdef VBOX_WITH_REM
826	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
827	{
828	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
829	REMR3NotifyFF(pUVCpu->pVM);
830	}
831	#endif
832	}
833	}
834
835
836	/**
837	* Bootstrap VMR3Wait() worker.
838	*
839	* @returns VBox status code.
840	* @param pUVMCPU Pointer to the user mode VMCPU structure.
841	*/
842	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
843	{
844	PUVM pUVM = pUVCpu->pUVM;
845
846	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
847
848	int rc = VINF_SUCCESS;
849	for (;;)
850	{
851	/*
852	* Check Relevant FFs.
853	*/
854	if (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs) /* global requests pending? */
855	break;
856	if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs) /* local requests pending? */
857	break;
858
859	if ( pUVCpu->pVM
860	&& ( VM_FF_IS_PENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
861	\|\| VMCPU_FF_IS_PENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
862	)
863	)
864	break;
865	if (pUVM->vm.s.fTerminateEMT)
866	break;
867
868	/*
869	* Wait for a while. Someone will wake us up or interrupt the call if
870	* anything needs our attention.
871	*/
872	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
873	if (rc == VERR_TIMEOUT)
874	rc = VINF_SUCCESS;
875	else if (RT_FAILURE(rc))
876	{
877	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
878	break;
879	}
880	}
881
882	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
883	return rc;
884	}
885
886
887	/**
888	* Bootstrap VMR3NotifyFF() worker.
889	*
890	* @param pUVCpu Pointer to the user mode VMCPU structure.
891	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
892	*/
893	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
894	{
895	if (pUVCpu->vm.s.fWait)
896	{
897	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
898	AssertRC(rc);
899	}
900	NOREF(fFlags);
901	}
902
903
904	/**
905	* Default VMR3Wait() worker.
906	*
907	* @returns VBox status code.
908	* @param pUVMCPU Pointer to the user mode VMCPU structure.
909	*/
910	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
911	{
912	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
913
914	PVM pVM = pUVCpu->pVM;
915	PVMCPU pVCpu = pUVCpu->pVCpu;
916	int rc = VINF_SUCCESS;
917	for (;;)
918	{
919	/*
920	* Check Relevant FFs.
921	*/
922	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
923	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
924	break;
925
926	/*
927	* Wait for a while. Someone will wake us up or interrupt the call if
928	* anything needs our attention.
929	*/
930	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
931	if (rc == VERR_TIMEOUT)
932	rc = VINF_SUCCESS;
933	else if (RT_FAILURE(rc))
934	{
935	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc", rc);
936	break;
937	}
938	}
939
940	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
941	return rc;
942	}
943
944
945	/**
946	* Default VMR3NotifyFF() worker.
947	*
948	* @param pUVCpu Pointer to the user mode VMCPU structure.
949	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
950	*/
951	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
952	{
953	if (pUVCpu->vm.s.fWait)
954	{
955	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
956	AssertRC(rc);
957	}
958	#ifdef VBOX_WITH_REM
959	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
960	&& pUVCpu->pVCpu
961	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
962	REMR3NotifyFF(pUVCpu->pVM);
963	#endif
964	}
965
966
967	/**
968	* Array with halt method descriptors.
969	* VMINT::iHaltMethod contains an index into this array.
970	*/
971	static const struct VMHALTMETHODDESC
972	{
973	/** The halt method id. */
974	VMHALTMETHOD enmHaltMethod;
975	/** The init function for loading config and initialize variables. */
976	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
977	/** The term function. */
978	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
979	/** The VMR3WaitHaltedU function. */
980	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
981	/** The VMR3WaitU function. */
982	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
983	/** The VMR3NotifyCpuFFU function. */
984	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
985	/** The VMR3NotifyGlobalFFU function. */
986	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
987	} g_aHaltMethods[] =
988	{
989	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
990	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
991	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
992	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
993	};
994
995
996	/**
997	* Notify the emulation thread (EMT) about pending Forced Action (FF).
998	*
999	* This function is called by thread other than EMT to make
1000	* sure EMT wakes up and promptly service an FF request.
1001	*
1002	* @param pUVM Pointer to the user mode VM structure.
1003	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1004	* @internal
1005	*/
1006	VMMR3_INT_DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
1007	{
1008	LogFlow(("VMR3NotifyGlobalFFU:\n"));
1009	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
1010
1011	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
1012	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
1013	else
1014	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
1015	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
1016	}
1017
1018
1019	/**
1020	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1021	*
1022	* This function is called by thread other than EMT to make
1023	* sure EMT wakes up and promptly service an FF request.
1024	*
1025	* @param pUVCpu Pointer to the user mode per CPU VM structure.
1026	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1027	* @internal
1028	*/
1029	VMMR3_INT_DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
1030	{
1031	PUVM pUVM = pUVCpu->pUVM;
1032
1033	LogFlow(("VMR3NotifyCpuFFU:\n"));
1034	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
1035	}
1036
1037
1038	/**
1039	* Halted VM Wait.
1040	* Any external event will unblock the thread.
1041	*
1042	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1043	* case an appropriate status code is returned.
1044	* @param pVM Pointer to the VM.
1045	* @param pVCpu Pointer to the VMCPU.
1046	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
1047	* @thread The emulation thread.
1048	* @remarks Made visible for implementing vmsvga sync register.
1049	* @internal
1050	*/
1051	VMMR3_INT_DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
1052	{
1053	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
1054
1055	/*
1056	* Check Relevant FFs.
1057	*/
1058	const uint32_t fMask = !fIgnoreInterrupts
1059	? VMCPU_FF_EXTERNAL_HALTED_MASK
1060	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
1061	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
1062	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
1063	{
1064	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
1065	return VINF_SUCCESS;
1066	}
1067
1068	/*
1069	* The yielder is suspended while we're halting, while TM might have clock(s) running
1070	* only at certain times and need to be notified..
1071	*/
1072	if (pVCpu->idCpu == 0)
1073	VMMR3YieldSuspend(pVM);
1074	TMNotifyStartOfHalt(pVCpu);
1075
1076	/*
1077	* Record halt averages for the last second.
1078	*/
1079	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1080	uint64_t u64Now = RTTimeNanoTS();
1081	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1082	if (off > 1000000000)
1083	{
1084	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1085	{
1086	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1087	pUVCpu->vm.s.HaltFrequency = 1;
1088	}
1089	else
1090	{
1091	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1092	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1093	}
1094	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1095	pUVCpu->vm.s.cHalts = 0;
1096	}
1097	pUVCpu->vm.s.cHalts++;
1098
1099	/*
1100	* Do the halt.
1101	*/
1102	VMCPU_ASSERT_STATE(pVCpu, VMCPUSTATE_STARTED);
1103	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1104	PUVM pUVM = pUVCpu->pUVM;
1105	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1106	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1107
1108	/*
1109	* Notify TM and resume the yielder
1110	*/
1111	TMNotifyEndOfHalt(pVCpu);
1112	if (pVCpu->idCpu == 0)
1113	VMMR3YieldResume(pVM);
1114
1115	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1116	return rc;
1117	}
1118
1119
1120	/**
1121	* Suspended VM Wait.
1122	* Only a handful of forced actions will cause the function to
1123	* return to the caller.
1124	*
1125	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1126	* case an appropriate status code is returned.
1127	* @param pUVCpu Pointer to the user mode VMCPU structure.
1128	* @thread The emulation thread.
1129	* @internal
1130	*/
1131	VMMR3_INT_DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1132	{
1133	LogFlow(("VMR3WaitU:\n"));
1134
1135	/*
1136	* Check Relevant FFs.
1137	*/
1138	PVM pVM = pUVCpu->pVM;
1139	PVMCPU pVCpu = pUVCpu->pVCpu;
1140
1141	if ( pVM
1142	&& ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1143	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1144	)
1145	)
1146	{
1147	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1148	return VINF_SUCCESS;
1149	}
1150
1151	/*
1152	* Do waiting according to the halt method (so VMR3NotifyFF
1153	* doesn't have to special case anything).
1154	*/
1155	PUVM pUVM = pUVCpu->pUVM;
1156	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1157	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pUVM->pVM ? pUVM->pVM->fGlobalForcedActions : 0));
1158	return rc;
1159	}
1160
1161
1162	/**
1163	* Interface that PDMR3Suspend, PDMR3PowerOff and PDMR3Reset uses when they wait
1164	* for the handling of asynchronous notifications to complete.
1165	*
1166	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1167	* case an appropriate status code is returned.
1168	* @param pUVCpu Pointer to the user mode VMCPU structure.
1169	* @thread The emulation thread.
1170	*/
1171	VMMR3_INT_DECL(int) VMR3AsyncPdmNotificationWaitU(PUVMCPU pUVCpu)
1172	{
1173	LogFlow(("VMR3AsyncPdmNotificationWaitU:\n"));
1174	return VMR3WaitU(pUVCpu);
1175	}
1176
1177
1178	/**
1179	* Interface that PDM the helper asynchronous notification completed methods
1180	* uses for EMT0 when it is waiting inside VMR3AsyncPdmNotificationWaitU().
1181	*
1182	* @param pUVM Pointer to the user mode VM structure.
1183	*/
1184	VMMR3_INT_DECL(void) VMR3AsyncPdmNotificationWakeupU(PUVM pUVM)
1185	{
1186	LogFlow(("VMR3AsyncPdmNotificationWakeupU:\n"));
1187	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST); /* this will have to do for now. */
1188	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(&pUVM->aCpus[0], 0 /fFlags/);
1189	}
1190
1191
1192	/**
1193	* Rendezvous callback that will be called once.
1194	*
1195	* @returns VBox strict status code.
1196	* @param pVM Pointer to the VM.
1197	* @param pVCpu Pointer to the VMCPU of the calling EMT.
1198	* @param pvUser The new g_aHaltMethods index.
1199	*/
1200	static DECLCALLBACK(VBOXSTRICTRC) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1201	{
1202	PUVM pUVM = pVM->pUVM;
1203	uintptr_t i = (uintptr_t)pvUser;
1204	Assert(i < RT_ELEMENTS(g_aHaltMethods));
1205	NOREF(pVCpu);
1206
1207	/*
1208	* Terminate the old one.
1209	*/
1210	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1211	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1212	{
1213	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1214	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1215	}
1216
1217	/* Assert that the failure fallback is where we expect. */
1218	Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1219	Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1220
1221	/*
1222	* Init the new one.
1223	*/
1224	int rc = VINF_SUCCESS;
1225	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1226	if (g_aHaltMethods[i].pfnInit)
1227	{
1228	rc = g_aHaltMethods[i].pfnInit(pUVM);
1229	if (RT_FAILURE(rc))
1230	{
1231	/* Fall back on the bootstrap method. This requires no
1232	init/term (see assertion above), and will always work. */
1233	AssertLogRelRC(rc);
1234	i = 0;
1235	}
1236	}
1237
1238	/*
1239	* Commit it.
1240	*/
1241	pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1242	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1243
1244	return rc;
1245	}
1246
1247
1248	/**
1249	* Changes the halt method.
1250	*
1251	* @returns VBox status code.
1252	* @param pUVM Pointer to the user mode VM structure.
1253	* @param enmHaltMethod The new halt method.
1254	* @thread EMT.
1255	*/
1256	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1257	{
1258	PVM pVM = pUVM->pVM; Assert(pVM);
1259	VM_ASSERT_EMT(pVM);
1260	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1261
1262	/*
1263	* Resolve default (can be overridden in the configuration).
1264	*/
1265	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1266	{
1267	uint32_t u32;
1268	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1269	if (RT_SUCCESS(rc))
1270	{
1271	enmHaltMethod = (VMHALTMETHOD)u32;
1272	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1273	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1274	}
1275	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1276	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1277	else
1278	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1279	//enmHaltMethod = VMHALTMETHOD_1;
1280	//enmHaltMethod = VMHALTMETHOD_OLD;
1281	}
1282	LogRel(("VMEmt: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1283
1284	/*
1285	* Find the descriptor.
1286	*/
1287	unsigned i = 0;
1288	while ( i < RT_ELEMENTS(g_aHaltMethods)
1289	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1290	i++;
1291	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1292
1293	/*
1294	* This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1295	*/
1296	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1297	}
1298
1299
1300	/**
1301	* Special interface for implementing a HLT-like port on a device.
1302	*
1303	* This can be called directly from device code, provide the device is trusted
1304	* to access the VMM directly. Since we may not have an accurate register set
1305	* and the caller certainly shouldn't (device code does not access CPU
1306	* registers), this function will return when interrupts are pending regardless
1307	* of the actual EFLAGS.IF state.
1308	*
1309	* @returns VBox error status (never informational statuses).
1310	* @param pVM The VM handle.
1311	* @param idCpu The id of the calling EMT.
1312	*/
1313	VMMR3DECL(int) VMR3WaitForDeviceReady(PVM pVM, VMCPUID idCpu)
1314	{
1315	/*
1316	* Validate caller and resolve the CPU ID.
1317	*/
1318	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1319	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1320	PVMCPU pVCpu = &pVM->aCpus[idCpu];
1321	VMCPU_ASSERT_EMT_RETURN(pVCpu, VERR_VM_THREAD_NOT_EMT);
1322
1323	/*
1324	* Tag along with the HLT mechanics for now.
1325	*/
1326	int rc = VMR3WaitHalted(pVM, pVCpu, false /fIgnoreInterrupts/);
1327	if (RT_SUCCESS(rc))
1328	return VINF_SUCCESS;
1329	return rc;
1330	}
1331
1332
1333	/**
1334	* Wakes up a CPU that has called VMR3WaitForDeviceReady.
1335	*
1336	* @returns VBox error status (never informational statuses).
1337	* @param pVM The VM handle.
1338	* @param idCpu The id of the calling EMT.
1339	*/
1340	VMMR3DECL(int) VMR3NotifyCpuDeviceReady(PVM pVM, VMCPUID idCpu)
1341	{
1342	/*
1343	* Validate caller and resolve the CPU ID.
1344	*/
1345	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1346	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1347	PVMCPU pVCpu = &pVM->aCpus[idCpu];
1348
1349	/*
1350	* Pretend it was an FF that got set since we've got logic for that already.
1351	*/
1352	VMR3NotifyCpuFFU(pVCpu->pUVCpu, VMNOTIFYFF_FLAGS_DONE_REM);
1353	return VINF_SUCCESS;
1354	}
1355

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source: vbox/trunk/src/VBox/VMM/VMMR3/VMEmt.cpp@ 57358

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