VMEmt.cpp@ 62650

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1	/* $Id: VMEmt.cpp 62650 2016-07-28 22:05:44Z vboxsync $ */
2	/** @file
3	* VM - Virtual Machine, The Emulation Thread.
4	*/
5
6	/*
7	* Copyright (C) 2006-2016 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 hThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu);
50
51
52	/**
53	* The emulation thread main function.
54	*
55	* @returns Thread exit code.
56	* @param hThreadSelf The handle to the executing thread.
57	* @param pvArgs Pointer to the user mode per-VCpu structure (UVMPCU).
58	*/
59	DECLCALLBACK(int) vmR3EmulationThread(RTTHREAD hThreadSelf, void *pvArgs)
60	{
61	PUVMCPU pUVCpu = (PUVMCPU)pvArgs;
62	return vmR3EmulationThreadWithId(hThreadSelf, 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 hThreadSelf 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 hThreadSelf, PUVMCPU pUVCpu, VMCPUID idCpu)
75	{
76	PUVM pUVM = pUVCpu->pUVM;
77	int rc;
78	RT_NOREF_PV(hThreadSelf);
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	if ( pUVM->pVmm2UserMethods
87	&& pUVM->pVmm2UserMethods->pfnNotifyEmtInit)
88	pUVM->pVmm2UserMethods->pfnNotifyEmtInit(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
89
90	/*
91	* The request loop.
92	*/
93	rc = VINF_SUCCESS;
94	Log(("vmR3EmulationThread: Emulation thread starting the days work... Thread=%#x pUVM=%p\n", hThreadSelf, pUVM));
95	VMSTATE enmBefore = VMSTATE_CREATED; /* (only used for logging atm.) */
96	for (;;)
97	{
98	/*
99	* During early init there is no pVM, so make a special path
100	* for that to keep things clearly separate.
101	*/
102	if (!pUVM->pVM)
103	{
104	/*
105	* Check for termination first.
106	*/
107	if (pUVM->vm.s.fTerminateEMT)
108	{
109	rc = VINF_EM_TERMINATE;
110	break;
111	}
112
113	/*
114	* Only the first VCPU may initialize the VM during early init
115	* and must therefore service all VMCPUID_ANY requests.
116	* See also VMR3Create
117	*/
118	if ( (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs)
119	&& pUVCpu->idCpu == 0)
120	{
121	/*
122	* Service execute in any EMT request.
123	*/
124	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /fPriorityOnly/);
125	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
126	}
127	else if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs)
128	{
129	/*
130	* Service execute in specific EMT request.
131	*/
132	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /fPriorityOnly/);
133	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
134	}
135	else
136	{
137	/*
138	* Nothing important is pending, so wait for something.
139	*/
140	rc = VMR3WaitU(pUVCpu);
141	if (RT_FAILURE(rc))
142	{
143	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
144	break;
145	}
146	}
147	}
148	else
149	{
150	/*
151	* Pending requests which needs servicing?
152	*
153	* We check for state changes in addition to status codes when
154	* servicing requests. (Look after the ifs.)
155	*/
156	PVM pVM = pUVM->pVM;
157	PVMCPU pVCpu = pUVCpu->pVCpu;
158	enmBefore = pVM->enmVMState;
159	if (pUVM->vm.s.fTerminateEMT)
160	{
161	rc = VINF_EM_TERMINATE;
162	break;
163	}
164
165	if (VM_FF_IS_PENDING(pVM, VM_FF_EMT_RENDEZVOUS))
166	{
167	rc = VMMR3EmtRendezvousFF(pVM, &pVM->aCpus[idCpu]);
168	Log(("vmR3EmulationThread: Rendezvous rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
169	}
170	else if (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs)
171	{
172	/*
173	* Service execute in any EMT request.
174	*/
175	rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /fPriorityOnly/);
176	Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
177	}
178	else if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs)
179	{
180	/*
181	* Service execute in specific EMT request.
182	*/
183	rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /fPriorityOnly/);
184	Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
185	}
186	else if ( VM_FF_IS_SET(pVM, VM_FF_DBGF)
187	\|\| VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_DBGF))
188	{
189	/*
190	* Service the debugger request.
191	*/
192	rc = DBGFR3VMMForcedAction(pVM, pVCpu);
193	Log(("vmR3EmulationThread: Dbg rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
194	}
195	else if (VM_FF_TEST_AND_CLEAR(pVM, VM_FF_RESET))
196	{
197	/*
198	* Service a delayed reset request.
199	*/
200	rc = VBOXSTRICTRC_VAL(VMR3ResetFF(pVM));
201	VM_FF_CLEAR(pVM, VM_FF_RESET);
202	Log(("vmR3EmulationThread: Reset rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), VMR3GetStateName(pVM->enmVMState)));
203	}
204	else
205	{
206	/*
207	* Nothing important is pending, so wait for something.
208	*/
209	rc = VMR3WaitU(pUVCpu);
210	if (RT_FAILURE(rc))
211	{
212	AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
213	break;
214	}
215	}
216
217	/*
218	* Check for termination requests, these have extremely high priority.
219	*/
220	if ( rc == VINF_EM_TERMINATE
221	\|\| pUVM->vm.s.fTerminateEMT)
222	break;
223	}
224
225	/*
226	* Some requests (both VMR3Req* and the DBGF) can potentially resume
227	* or start the VM, in that case we'll get a change in VM status
228	* indicating that we're now running.
229	*/
230	if ( RT_SUCCESS(rc)
231	&& pUVM->pVM)
232	{
233	PVM pVM = pUVM->pVM;
234	PVMCPU pVCpu = &pVM->aCpus[idCpu];
235	if ( pVM->enmVMState == VMSTATE_RUNNING
236	&& VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
237	{
238	rc = EMR3ExecuteVM(pVM, pVCpu);
239	Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
240	}
241	}
242
243	} /* forever */
244
245
246	/*
247	* Cleanup and exit.
248	*/
249	Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
250	hThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
251	if ( idCpu == 0
252	&& pUVM->pVM)
253	{
254	PVM pVM = pUVM->pVM;
255	vmR3SetTerminated(pVM);
256	pUVM->pVM = NULL;
257
258	/** @todo SMP: This isn't 100% safe. We should wait for the other
259	* threads to finish before destroy the VM. */
260	int rc2 = SUPR3CallVMMR0Ex(pVM->pVMR0, 0 /idCpu/, VMMR0_DO_GVMM_DESTROY_VM, 0, NULL);
261	AssertLogRelRC(rc2);
262	}
263
264	if ( pUVM->pVmm2UserMethods
265	&& pUVM->pVmm2UserMethods->pfnNotifyEmtTerm)
266	pUVM->pVmm2UserMethods->pfnNotifyEmtTerm(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
267
268	pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
269	Log(("vmR3EmulationThread: EMT is terminated.\n"));
270	return rc;
271	}
272
273
274	/**
275	* Gets the name of a halt method.
276	*
277	* @returns Pointer to a read only string.
278	* @param enmMethod The method.
279	*/
280	static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
281	{
282	switch (enmMethod)
283	{
284	case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
285	case VMHALTMETHOD_DEFAULT: return "default";
286	case VMHALTMETHOD_OLD: return "old";
287	case VMHALTMETHOD_1: return "method1";
288	//case VMHALTMETHOD_2: return "method2";
289	case VMHALTMETHOD_GLOBAL_1: return "global1";
290	default: return "unknown";
291	}
292	}
293
294
295	/**
296	* Signal a fatal wait error.
297	*
298	* @returns Fatal error code to be propagated up the call stack.
299	* @param pUVCpu The user mode per CPU structure of the calling
300	* EMT.
301	* @param pszFmt The error format with a single %Rrc in it.
302	* @param rcFmt The status code to format.
303	*/
304	static int vmR3FatalWaitError(PUVMCPU pUVCpu, const char *pszFmt, int rcFmt)
305	{
306	/** @todo This is wrong ... raise a fatal error / guru meditation
307	* instead. */
308	AssertLogRelMsgFailed((pszFmt, rcFmt));
309	ASMAtomicUoWriteBool(&pUVCpu->pUVM->vm.s.fTerminateEMT, true);
310	if (pUVCpu->pVM)
311	VM_FF_SET(pUVCpu->pVM, VM_FF_CHECK_VM_STATE);
312	return VERR_VM_FATAL_WAIT_ERROR;
313	}
314
315
316	/**
317	* The old halt loop.
318	*/
319	static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
320	{
321	/*
322	* Halt loop.
323	*/
324	PVM pVM = pUVCpu->pVM;
325	PVMCPU pVCpu = pUVCpu->pVCpu;
326
327	int rc = VINF_SUCCESS;
328	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
329	//unsigned cLoops = 0;
330	for (;;)
331	{
332	/*
333	* Work the timers and check if we can exit.
334	* The poll call gives us the ticks left to the next event in
335	* addition to perhaps set an FF.
336	*/
337	uint64_t const u64StartTimers = RTTimeNanoTS();
338	TMR3TimerQueuesDo(pVM);
339	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
340	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
341	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
342	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
343	break;
344	uint64_t u64NanoTS;
345	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
346	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
347	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
348	break;
349
350	/*
351	* Wait for a while. Someone will wake us up or interrupt the call if
352	* anything needs our attention.
353	*/
354	if (u64NanoTS < 50000)
355	{
356	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
357	/* spin */;
358	}
359	else
360	{
361	VMMR3YieldStop(pVM);
362	//uint64_t u64Start = RTTimeNanoTS();
363	if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
364	{
365	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
366	uint64_t const u64StartSchedYield = RTTimeNanoTS();
367	RTThreadYield(); /* this is the best we can do here */
368	uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
369	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
370	}
371	else if (u64NanoTS < 2000000)
372	{
373	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
374	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
375	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
376	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
377	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
378	}
379	else
380	{
381	//RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
382	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
383	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
384	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
385	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
386	}
387	//uint64_t u64Slept = RTTimeNanoTS() - u64Start;
388	//RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
389	}
390	if (rc == VERR_TIMEOUT)
391	rc = VINF_SUCCESS;
392	else if (RT_FAILURE(rc))
393	{
394	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
395	break;
396	}
397	}
398
399	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
400	return rc;
401	}
402
403
404	/**
405	* Initialize the configuration of halt method 1 & 2.
406	*
407	* @return VBox status code. Failure on invalid CFGM data.
408	* @param pUVM The user mode VM structure.
409	*/
410	static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
411	{
412	/*
413	* The defaults.
414	*/
415	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
416	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
417	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
418	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
419	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
420	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
421	#else
422	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
423	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
424	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
425	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
426	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
427	#endif
428
429	/*
430	* Query overrides.
431	*
432	* I don't have time to bother with niceties such as invalid value checks
433	* here right now. sorry.
434	*/
435	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
436	if (pCfg)
437	{
438	uint32_t u32;
439	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
440	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
441	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
442	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
443	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
444	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
445	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
446	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
447	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
448	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
449	LogRel(("VMEmt: HaltedMethod1 config: %d/%d/%d/%d/%d\n",
450	pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
451	pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
452	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
453	pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
454	pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
455	}
456
457	return VINF_SUCCESS;
458	}
459
460
461	/**
462	* Initialize halt method 1.
463	*
464	* @return VBox status code.
465	* @param pUVM Pointer to the user mode VM structure.
466	*/
467	static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
468	{
469	return vmR3HaltMethod12ReadConfigU(pUVM);
470	}
471
472
473	/**
474	* Method 1 - Block whenever possible, and when lagging behind
475	* switch to spinning for 10-30ms with occasional blocking until
476	* the lag has been eliminated.
477	*/
478	static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
479	{
480	PUVM pUVM = pUVCpu->pUVM;
481	PVMCPU pVCpu = pUVCpu->pVCpu;
482	PVM pVM = pUVCpu->pVM;
483
484	/*
485	* To simplify things, we decide up-front whether we should switch to spinning or
486	* not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
487	* and that it will generate interrupts or other events that will cause us to exit
488	* the halt loop.
489	*/
490	bool fBlockOnce = false;
491	bool fSpinning = false;
492	uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
493	if (u32CatchUpPct /* non-zero if catching up */)
494	{
495	if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
496	{
497	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
498	if (fSpinning)
499	{
500	uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
501	fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
502	> RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
503	RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
504	pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
505	}
506	else
507	{
508	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
509	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
510	}
511	}
512	else
513	{
514	fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
515	if (fSpinning)
516	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
517	}
518	}
519	else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
520	{
521	//RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
522	pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
523	}
524
525	/*
526	* Halt loop.
527	*/
528	int rc = VINF_SUCCESS;
529	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
530	unsigned cLoops = 0;
531	for (;; cLoops++)
532	{
533	/*
534	* Work the timers and check if we can exit.
535	*/
536	uint64_t const u64StartTimers = RTTimeNanoTS();
537	TMR3TimerQueuesDo(pVM);
538	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
539	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
540	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
541	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
542	break;
543
544	/*
545	* Estimate time left to the next event.
546	*/
547	uint64_t u64NanoTS;
548	TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
549	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
550	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
551	break;
552
553	/*
554	* Block if we're not spinning and the interval isn't all that small.
555	*/
556	if ( ( !fSpinning
557	\|\| fBlockOnce)
558	#if 1 /* DEBUGGING STUFF - REMOVE LATER */
559	&& u64NanoTS >= 100000) /* 0.100 ms */
560	#else
561	&& u64NanoTS >= 250000) /* 0.250 ms */
562	#endif
563	{
564	const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
565	VMMR3YieldStop(pVM);
566
567	uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
568	if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
569	cMilliSecs = 1;
570	else
571	cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
572
573	//RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
574	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
575	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
576	uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
577	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
578
579	if (rc == VERR_TIMEOUT)
580	rc = VINF_SUCCESS;
581	else if (RT_FAILURE(rc))
582	{
583	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
584	break;
585	}
586
587	/*
588	* Calc the statistics.
589	* Update averages every 16th time, and flush parts of the history every 64th time.
590	*/
591	const uint64_t Elapsed = RTTimeNanoTS() - Start;
592	pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
593	if (Elapsed > u64NanoTS)
594	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
595	pUVCpu->vm.s.Halt.Method12.cBlocks++;
596	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
597	{
598	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
599	if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
600	{
601	pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
602	pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
603	}
604	}
605	//RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
606
607	/*
608	* Clear the block once flag if we actually blocked.
609	*/
610	if ( fBlockOnce
611	&& Elapsed > 100000 /* 0.1 ms */)
612	fBlockOnce = false;
613	}
614	}
615	//if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
616
617	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
618	return rc;
619	}
620
621
622	/**
623	* Initialize the global 1 halt method.
624	*
625	* @return VBox status code.
626	* @param pUVM Pointer to the user mode VM structure.
627	*/
628	static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
629	{
630	/*
631	* The defaults.
632	*/
633	uint32_t cNsResolution = SUPSemEventMultiGetResolution(pUVM->vm.s.pSession);
634	if (cNsResolution > 5*RT_NS_100US)
635	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 50000;
636	else if (cNsResolution > RT_NS_100US)
637	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = cNsResolution / 4;
638	else
639	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 2000;
640
641	/*
642	* Query overrides.
643	*
644	* I don't have time to bother with niceties such as invalid value checks
645	* here right now. sorry.
646	*/
647	PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedGlobal1");
648	if (pCfg)
649	{
650	uint32_t u32;
651	if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "SpinBlockThreshold", &u32)))
652	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = u32;
653	}
654	LogRel(("VMEmt: HaltedGlobal1 config: cNsSpinBlockThresholdCfg=%u\n",
655	pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg));
656	return VINF_SUCCESS;
657	}
658
659
660	/**
661	* The global 1 halt method - Block in GMM (ring-0) and let it
662	* try take care of the global scheduling of EMT threads.
663	*/
664	static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
665	{
666	PUVM pUVM = pUVCpu->pUVM;
667	PVMCPU pVCpu = pUVCpu->pVCpu;
668	PVM pVM = pUVCpu->pVM;
669	Assert(VMMGetCpu(pVM) == pVCpu);
670	NOREF(u64Now);
671
672	/*
673	* Halt loop.
674	*/
675	//uint64_t u64NowLog, u64Start;
676	//u64Start = u64NowLog = RTTimeNanoTS();
677	int rc = VINF_SUCCESS;
678	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
679	unsigned cLoops = 0;
680	for (;; cLoops++)
681	{
682	/*
683	* Work the timers and check if we can exit.
684	*/
685	uint64_t const u64StartTimers = RTTimeNanoTS();
686	TMR3TimerQueuesDo(pVM);
687	uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
688	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
689	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
690	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
691	break;
692
693	/*
694	* Estimate time left to the next event.
695	*/
696	//u64NowLog = RTTimeNanoTS();
697	uint64_t u64Delta;
698	uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
699	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
700	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
701	break;
702
703	/*
704	* Block if we're not spinning and the interval isn't all that small.
705	*/
706	if (u64Delta >= pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg)
707	{
708	VMMR3YieldStop(pVM);
709	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
710	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
711	break;
712
713	//RTLogPrintf("loop=%-3d u64GipTime=%'llu / %'llu now=%'llu / %'llu\n", cLoops, u64GipTime, u64Delta, u64NowLog, u64GipTime - u64NowLog);
714	uint64_t const u64StartSchedHalt = RTTimeNanoTS();
715	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
716	uint64_t const u64EndSchedHalt = RTTimeNanoTS();
717	uint64_t const cNsElapsedSchedHalt = u64EndSchedHalt - u64StartSchedHalt;
718	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
719
720	if (rc == VERR_INTERRUPTED)
721	rc = VINF_SUCCESS;
722	else if (RT_FAILURE(rc))
723	{
724	rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Halt: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
725	break;
726	}
727	else
728	{
729	int64_t const cNsOverslept = u64EndSchedHalt - u64GipTime;
730	if (cNsOverslept > 50000)
731	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOverslept, cNsOverslept);
732	else if (cNsOverslept < -50000)
733	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockInsomnia, cNsElapsedSchedHalt);
734	else
735	STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOnTime, cNsElapsedSchedHalt);
736	}
737	}
738	/*
739	* When spinning call upon the GVMM and do some wakups once
740	* in a while, it's not like we're actually busy or anything.
741	*/
742	else if (!(cLoops & 0x1fff))
743	{
744	uint64_t const u64StartSchedYield = RTTimeNanoTS();
745	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
746	uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
747	STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
748	}
749	}
750	//RTLogPrintf("*** %u loops %'llu; lag=%RU64\n", cLoops, u64NowLog - u64Start, TMVirtualSyncGetLag(pVM));
751
752	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
753	return rc;
754	}
755
756
757	/**
758	* The global 1 halt method - VMR3Wait() worker.
759	*
760	* @returns VBox status code.
761	* @param pUVCpu Pointer to the user mode VMCPU structure.
762	*/
763	static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
764	{
765	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
766
767	PVM pVM = pUVCpu->pUVM->pVM;
768	PVMCPU pVCpu = VMMGetCpu(pVM);
769	Assert(pVCpu->idCpu == pUVCpu->idCpu);
770
771	int rc = VINF_SUCCESS;
772	for (;;)
773	{
774	/*
775	* Check Relevant FFs.
776	*/
777	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
778	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
779	break;
780
781	/*
782	* Wait for a while. Someone will wake us up or interrupt the call if
783	* anything needs our attention.
784	*/
785	rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
786	if (rc == VERR_INTERRUPTED)
787	rc = VINF_SUCCESS;
788	else if (RT_FAILURE(rc))
789	{
790	rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Wait: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
791	break;
792	}
793	}
794
795	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
796	return rc;
797	}
798
799
800	/**
801	* The global 1 halt method - VMR3NotifyFF() worker.
802	*
803	* @param pUVCpu Pointer to the user mode VMCPU structure.
804	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
805	*/
806	static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
807	{
808	if (pUVCpu->vm.s.fWait)
809	{
810	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
811	AssertRC(rc);
812	}
813	else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
814	\|\| !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
815	&& pUVCpu->pVCpu)
816	{
817	VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
818	if (enmState == VMCPUSTATE_STARTED_EXEC)
819	{
820	if (fFlags & VMNOTIFYFF_FLAGS_POKE)
821	{
822	int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
823	AssertRC(rc);
824	}
825	}
826	#ifdef VBOX_WITH_REM
827	else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
828	{
829	if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
830	REMR3NotifyFF(pUVCpu->pVM);
831	}
832	#endif
833	}
834	}
835
836
837	/**
838	* Bootstrap VMR3Wait() worker.
839	*
840	* @returns VBox status code.
841	* @param pUVCpu Pointer to the user mode VMCPU structure.
842	*/
843	static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
844	{
845	PUVM pUVM = pUVCpu->pUVM;
846
847	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
848
849	int rc = VINF_SUCCESS;
850	for (;;)
851	{
852	/*
853	* Check Relevant FFs.
854	*/
855	if (pUVM->vm.s.pNormalReqs \|\| pUVM->vm.s.pPriorityReqs) /* global requests pending? */
856	break;
857	if (pUVCpu->vm.s.pNormalReqs \|\| pUVCpu->vm.s.pPriorityReqs) /* local requests pending? */
858	break;
859
860	if ( pUVCpu->pVM
861	&& ( VM_FF_IS_PENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
862	\|\| VMCPU_FF_IS_PENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
863	)
864	)
865	break;
866	if (pUVM->vm.s.fTerminateEMT)
867	break;
868
869	/*
870	* Wait for a while. Someone will wake us up or interrupt the call if
871	* anything needs our attention.
872	*/
873	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
874	if (rc == VERR_TIMEOUT)
875	rc = VINF_SUCCESS;
876	else if (RT_FAILURE(rc))
877	{
878	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
879	break;
880	}
881	}
882
883	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
884	return rc;
885	}
886
887
888	/**
889	* Bootstrap VMR3NotifyFF() worker.
890	*
891	* @param pUVCpu Pointer to the user mode VMCPU structure.
892	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
893	*/
894	static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
895	{
896	if (pUVCpu->vm.s.fWait)
897	{
898	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
899	AssertRC(rc);
900	}
901	NOREF(fFlags);
902	}
903
904
905	/**
906	* Default VMR3Wait() worker.
907	*
908	* @returns VBox status code.
909	* @param pUVCpu Pointer to the user mode VMCPU structure.
910	*/
911	static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
912	{
913	ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
914
915	PVM pVM = pUVCpu->pVM;
916	PVMCPU pVCpu = pUVCpu->pVCpu;
917	int rc = VINF_SUCCESS;
918	for (;;)
919	{
920	/*
921	* Check Relevant FFs.
922	*/
923	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
924	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
925	break;
926
927	/*
928	* Wait for a while. Someone will wake us up or interrupt the call if
929	* anything needs our attention.
930	*/
931	rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
932	if (rc == VERR_TIMEOUT)
933	rc = VINF_SUCCESS;
934	else if (RT_FAILURE(rc))
935	{
936	rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc", rc);
937	break;
938	}
939	}
940
941	ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
942	return rc;
943	}
944
945
946	/**
947	* Default VMR3NotifyFF() worker.
948	*
949	* @param pUVCpu Pointer to the user mode VMCPU structure.
950	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
951	*/
952	static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
953	{
954	if (pUVCpu->vm.s.fWait)
955	{
956	int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
957	AssertRC(rc);
958	}
959	#ifdef VBOX_WITH_REM
960	else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
961	&& pUVCpu->pVCpu
962	&& pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
963	REMR3NotifyFF(pUVCpu->pVM);
964	#endif
965	}
966
967
968	/**
969	* Array with halt method descriptors.
970	* VMINT::iHaltMethod contains an index into this array.
971	*/
972	static const struct VMHALTMETHODDESC
973	{
974	/** The halt method id. */
975	VMHALTMETHOD enmHaltMethod;
976	/** The init function for loading config and initialize variables. */
977	DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
978	/** The term function. */
979	DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
980	/** The VMR3WaitHaltedU function. */
981	DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
982	/** The VMR3WaitU function. */
983	DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
984	/** The VMR3NotifyCpuFFU function. */
985	DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
986	/** The VMR3NotifyGlobalFFU function. */
987	DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
988	} g_aHaltMethods[] =
989	{
990	{ VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
991	{ VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
992	{ VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
993	{ VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
994	};
995
996
997	/**
998	* Notify the emulation thread (EMT) about pending Forced Action (FF).
999	*
1000	* This function is called by thread other than EMT to make
1001	* sure EMT wakes up and promptly service an FF request.
1002	*
1003	* @param pUVM Pointer to the user mode VM structure.
1004	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1005	* @internal
1006	*/
1007	VMMR3_INT_DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
1008	{
1009	LogFlow(("VMR3NotifyGlobalFFU:\n"));
1010	uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
1011
1012	if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
1013	g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
1014	else
1015	for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
1016	g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
1017	}
1018
1019
1020	/**
1021	* Notify the emulation thread (EMT) about pending Forced Action (FF).
1022	*
1023	* This function is called by thread other than EMT to make
1024	* sure EMT wakes up and promptly service an FF request.
1025	*
1026	* @param pUVCpu Pointer to the user mode per CPU VM structure.
1027	* @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1028	* @internal
1029	*/
1030	VMMR3_INT_DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
1031	{
1032	PUVM pUVM = pUVCpu->pUVM;
1033
1034	LogFlow(("VMR3NotifyCpuFFU:\n"));
1035	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
1036	}
1037
1038
1039	/**
1040	* Halted VM Wait.
1041	* Any external event will unblock the thread.
1042	*
1043	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1044	* case an appropriate status code is returned.
1045	* @param pVM The cross context VM structure.
1046	* @param pVCpu The cross context virtual CPU structure.
1047	* @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
1048	* @thread The emulation thread.
1049	* @remarks Made visible for implementing vmsvga sync register.
1050	* @internal
1051	*/
1052	VMMR3_INT_DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
1053	{
1054	LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
1055
1056	/*
1057	* Check Relevant FFs.
1058	*/
1059	const uint32_t fMask = !fIgnoreInterrupts
1060	? VMCPU_FF_EXTERNAL_HALTED_MASK
1061	: VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_UPDATE_APIC \| VMCPU_FF_INTERRUPT_APIC \| VMCPU_FF_INTERRUPT_PIC);
1062	if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
1063	\|\| VMCPU_FF_IS_PENDING(pVCpu, fMask))
1064	{
1065	LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
1066	return VINF_SUCCESS;
1067	}
1068
1069	/*
1070	* The yielder is suspended while we're halting, while TM might have clock(s) running
1071	* only at certain times and need to be notified..
1072	*/
1073	if (pVCpu->idCpu == 0)
1074	VMMR3YieldSuspend(pVM);
1075	TMNotifyStartOfHalt(pVCpu);
1076
1077	/*
1078	* Record halt averages for the last second.
1079	*/
1080	PUVMCPU pUVCpu = pVCpu->pUVCpu;
1081	uint64_t u64Now = RTTimeNanoTS();
1082	int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1083	if (off > 1000000000)
1084	{
1085	if (off > _4G \|\| !pUVCpu->vm.s.cHalts)
1086	{
1087	pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1088	pUVCpu->vm.s.HaltFrequency = 1;
1089	}
1090	else
1091	{
1092	pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1093	pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1094	}
1095	pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1096	pUVCpu->vm.s.cHalts = 0;
1097	}
1098	pUVCpu->vm.s.cHalts++;
1099
1100	/*
1101	* Do the halt.
1102	*/
1103	VMCPU_ASSERT_STATE(pVCpu, VMCPUSTATE_STARTED);
1104	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1105	PUVM pUVM = pUVCpu->pUVM;
1106	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1107	VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1108
1109	/*
1110	* Notify TM and resume the yielder
1111	*/
1112	TMNotifyEndOfHalt(pVCpu);
1113	if (pVCpu->idCpu == 0)
1114	VMMR3YieldResume(pVM);
1115
1116	LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1117	return rc;
1118	}
1119
1120
1121	/**
1122	* Suspended VM Wait.
1123	* Only a handful of forced actions will cause the function to
1124	* return to the caller.
1125	*
1126	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1127	* case an appropriate status code is returned.
1128	* @param pUVCpu Pointer to the user mode VMCPU structure.
1129	* @thread The emulation thread.
1130	* @internal
1131	*/
1132	VMMR3_INT_DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1133	{
1134	LogFlow(("VMR3WaitU:\n"));
1135
1136	/*
1137	* Check Relevant FFs.
1138	*/
1139	PVM pVM = pUVCpu->pVM;
1140	PVMCPU pVCpu = pUVCpu->pVCpu;
1141
1142	if ( pVM
1143	&& ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1144	\|\| VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1145	)
1146	)
1147	{
1148	LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1149	return VINF_SUCCESS;
1150	}
1151
1152	/*
1153	* Do waiting according to the halt method (so VMR3NotifyFF
1154	* doesn't have to special case anything).
1155	*/
1156	PUVM pUVM = pUVCpu->pUVM;
1157	int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1158	LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pUVM->pVM ? pUVM->pVM->fGlobalForcedActions : 0));
1159	return rc;
1160	}
1161
1162
1163	/**
1164	* Interface that PDMR3Suspend, PDMR3PowerOff and PDMR3Reset uses when they wait
1165	* for the handling of asynchronous notifications to complete.
1166	*
1167	* @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1168	* case an appropriate status code is returned.
1169	* @param pUVCpu Pointer to the user mode VMCPU structure.
1170	* @thread The emulation thread.
1171	*/
1172	VMMR3_INT_DECL(int) VMR3AsyncPdmNotificationWaitU(PUVMCPU pUVCpu)
1173	{
1174	LogFlow(("VMR3AsyncPdmNotificationWaitU:\n"));
1175	return VMR3WaitU(pUVCpu);
1176	}
1177
1178
1179	/**
1180	* Interface that PDM the helper asynchronous notification completed methods
1181	* uses for EMT0 when it is waiting inside VMR3AsyncPdmNotificationWaitU().
1182	*
1183	* @param pUVM Pointer to the user mode VM structure.
1184	*/
1185	VMMR3_INT_DECL(void) VMR3AsyncPdmNotificationWakeupU(PUVM pUVM)
1186	{
1187	LogFlow(("VMR3AsyncPdmNotificationWakeupU:\n"));
1188	VM_FF_SET(pUVM->pVM, VM_FF_REQUEST); /* this will have to do for now. */
1189	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(&pUVM->aCpus[0], 0 /fFlags/);
1190	}
1191
1192
1193	/**
1194	* Rendezvous callback that will be called once.
1195	*
1196	* @returns VBox strict status code.
1197	* @param pVM The cross context VM structure.
1198	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
1199	* @param pvUser The new g_aHaltMethods index.
1200	*/
1201	static DECLCALLBACK(VBOXSTRICTRC) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1202	{
1203	PUVM pUVM = pVM->pUVM;
1204	uintptr_t i = (uintptr_t)pvUser;
1205	Assert(i < RT_ELEMENTS(g_aHaltMethods));
1206	NOREF(pVCpu);
1207
1208	/*
1209	* Terminate the old one.
1210	*/
1211	if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1212	&& g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1213	{
1214	g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1215	pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1216	}
1217
1218	/* Assert that the failure fallback is where we expect. */
1219	Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1220	Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1221
1222	/*
1223	* Init the new one.
1224	*/
1225	int rc = VINF_SUCCESS;
1226	memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1227	if (g_aHaltMethods[i].pfnInit)
1228	{
1229	rc = g_aHaltMethods[i].pfnInit(pUVM);
1230	if (RT_FAILURE(rc))
1231	{
1232	/* Fall back on the bootstrap method. This requires no
1233	init/term (see assertion above), and will always work. */
1234	AssertLogRelRC(rc);
1235	i = 0;
1236	}
1237	}
1238
1239	/*
1240	* Commit it.
1241	*/
1242	pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1243	ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1244
1245	return rc;
1246	}
1247
1248
1249	/**
1250	* Changes the halt method.
1251	*
1252	* @returns VBox status code.
1253	* @param pUVM Pointer to the user mode VM structure.
1254	* @param enmHaltMethod The new halt method.
1255	* @thread EMT.
1256	*/
1257	int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1258	{
1259	PVM pVM = pUVM->pVM; Assert(pVM);
1260	VM_ASSERT_EMT(pVM);
1261	AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1262
1263	/*
1264	* Resolve default (can be overridden in the configuration).
1265	*/
1266	if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1267	{
1268	uint32_t u32;
1269	int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1270	if (RT_SUCCESS(rc))
1271	{
1272	enmHaltMethod = (VMHALTMETHOD)u32;
1273	if (enmHaltMethod <= VMHALTMETHOD_INVALID \|\| enmHaltMethod >= VMHALTMETHOD_END)
1274	return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1275	}
1276	else if (rc == VERR_CFGM_VALUE_NOT_FOUND \|\| rc == VERR_CFGM_CHILD_NOT_FOUND)
1277	return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1278	else
1279	enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1280	//enmHaltMethod = VMHALTMETHOD_1;
1281	//enmHaltMethod = VMHALTMETHOD_OLD;
1282	}
1283	LogRel(("VMEmt: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1284
1285	/*
1286	* Find the descriptor.
1287	*/
1288	unsigned i = 0;
1289	while ( i < RT_ELEMENTS(g_aHaltMethods)
1290	&& g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1291	i++;
1292	AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1293
1294	/*
1295	* This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1296	*/
1297	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1298	}
1299
1300
1301	/**
1302	* Special interface for implementing a HLT-like port on a device.
1303	*
1304	* This can be called directly from device code, provide the device is trusted
1305	* to access the VMM directly. Since we may not have an accurate register set
1306	* and the caller certainly shouldn't (device code does not access CPU
1307	* registers), this function will return when interrupts are pending regardless
1308	* of the actual EFLAGS.IF state.
1309	*
1310	* @returns VBox error status (never informational statuses).
1311	* @param pVM The cross context VM structure.
1312	* @param idCpu The id of the calling EMT.
1313	*/
1314	VMMR3DECL(int) VMR3WaitForDeviceReady(PVM pVM, VMCPUID idCpu)
1315	{
1316	/*
1317	* Validate caller and resolve the CPU ID.
1318	*/
1319	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1320	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1321	PVMCPU pVCpu = &pVM->aCpus[idCpu];
1322	VMCPU_ASSERT_EMT_RETURN(pVCpu, VERR_VM_THREAD_NOT_EMT);
1323
1324	/*
1325	* Tag along with the HLT mechanics for now.
1326	*/
1327	int rc = VMR3WaitHalted(pVM, pVCpu, false /fIgnoreInterrupts/);
1328	if (RT_SUCCESS(rc))
1329	return VINF_SUCCESS;
1330	return rc;
1331	}
1332
1333
1334	/**
1335	* Wakes up a CPU that has called VMR3WaitForDeviceReady.
1336	*
1337	* @returns VBox error status (never informational statuses).
1338	* @param pVM The cross context VM structure.
1339	* @param idCpu The id of the calling EMT.
1340	*/
1341	VMMR3DECL(int) VMR3NotifyCpuDeviceReady(PVM pVM, VMCPUID idCpu)
1342	{
1343	/*
1344	* Validate caller and resolve the CPU ID.
1345	*/
1346	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1347	AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1348	PVMCPU pVCpu = &pVM->aCpus[idCpu];
1349
1350	/*
1351	* Pretend it was an FF that got set since we've got logic for that already.
1352	*/
1353	VMR3NotifyCpuFFU(pVCpu->pUVCpu, VMNOTIFYFF_FLAGS_DONE_REM);
1354	return VINF_SUCCESS;
1355	}
1356

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source: vbox/trunk/src/VBox/VMM/VMMR3/VMEmt.cpp@ 62650

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