VirtualBox

source: vbox/trunk/src/VBox/VMM/VMMR3/VMEmt.cpp@ 68707

Last change on this file since 68707 was 67987, checked in by vboxsync, 7 years ago

GVMMR0: Added EMT deregistration API to complement the registration one.
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File size: 48.7 KB
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1/* $Id: VMEmt.cpp 67987 2017-07-17 11:24:30Z 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*********************************************************************************************************************************/
49int 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 */
59DECLCALLBACK(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 */
74int 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 and/or pVCpu, so make a special path
100 * for that to keep things clearly separate.
101 */
102 PVM pVM = pUVM->pVM;
103 PVMCPU pVCpu = pUVCpu->pVCpu;
104 if (!pVCpu || !pVM)
105 {
106 /*
107 * Check for termination first.
108 */
109 if (pUVM->vm.s.fTerminateEMT)
110 {
111 rc = VINF_EM_TERMINATE;
112 break;
113 }
114
115 /*
116 * Only the first VCPU may initialize the VM during early init
117 * and must therefore service all VMCPUID_ANY requests.
118 * See also VMR3Create
119 */
120 if ( (pUVM->vm.s.pNormalReqs || pUVM->vm.s.pPriorityReqs)
121 && pUVCpu->idCpu == 0)
122 {
123 /*
124 * Service execute in any EMT request.
125 */
126 rc = VMR3ReqProcessU(pUVM, VMCPUID_ANY, false /*fPriorityOnly*/);
127 Log(("vmR3EmulationThread: Req rc=%Rrc, VM state %s -> %s\n", rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
128 }
129 else if (pUVCpu->vm.s.pNormalReqs || pUVCpu->vm.s.pPriorityReqs)
130 {
131 /*
132 * Service execute in specific EMT request.
133 */
134 rc = VMR3ReqProcessU(pUVM, pUVCpu->idCpu, false /*fPriorityOnly*/);
135 Log(("vmR3EmulationThread: Req (cpu=%u) rc=%Rrc, VM state %s -> %s\n", pUVCpu->idCpu, rc, VMR3GetStateName(enmBefore), pUVM->pVM ? VMR3GetStateName(pUVM->pVM->enmVMState) : "CREATING"));
136 }
137 else
138 {
139 /*
140 * Nothing important is pending, so wait for something.
141 */
142 rc = VMR3WaitU(pUVCpu);
143 if (RT_FAILURE(rc))
144 {
145 AssertLogRelMsgFailed(("VMR3WaitU failed with %Rrc\n", rc));
146 break;
147 }
148 }
149 }
150 else
151 {
152 /*
153 * Pending requests which needs servicing?
154 *
155 * We check for state changes in addition to status codes when
156 * servicing requests. (Look after the ifs.)
157 */
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 {
232 pVM = pUVM->pVM;
233 if (pVM)
234 {
235 pVCpu = &pVM->aCpus[idCpu];
236 if ( pVM->enmVMState == VMSTATE_RUNNING
237 && VMCPUSTATE_IS_STARTED(VMCPU_GET_STATE(pVCpu)))
238 {
239 rc = EMR3ExecuteVM(pVM, pVCpu);
240 Log(("vmR3EmulationThread: EMR3ExecuteVM() -> rc=%Rrc, enmVMState=%d\n", rc, pVM->enmVMState));
241 }
242 }
243 }
244
245 } /* forever */
246
247
248 /*
249 * Cleanup and exit.
250 * EMT0 does the VM destruction after all other EMTs have deregistered and terminated.
251 */
252 Log(("vmR3EmulationThread: Terminating emulation thread! Thread=%#x pUVM=%p rc=%Rrc enmBefore=%d enmVMState=%d\n",
253 hThreadSelf, pUVM, rc, enmBefore, pUVM->pVM ? pUVM->pVM->enmVMState : VMSTATE_TERMINATED));
254 PVM pVM;
255 if ( idCpu == 0
256 && (pVM = pUVM->pVM) != NULL)
257 {
258 /* Wait for any other EMTs to terminate before we destroy the VM (see vmR3DestroyVM). */
259 for (VMCPUID iCpu = 1; iCpu < pUVM->cCpus; iCpu++)
260 {
261 RTTHREAD hThread;
262 ASMAtomicXchgHandle(&pUVM->aCpus[iCpu].vm.s.ThreadEMT, NIL_RTTHREAD, &hThread);
263 if (hThread != NIL_RTTHREAD)
264 {
265 int rc2 = RTThreadWait(hThread, 5 * RT_MS_1SEC, NULL);
266 AssertLogRelMsgRC(rc2, ("iCpu=%u rc=%Rrc\n", iCpu, rc2));
267 if (RT_FAILURE(rc2))
268 pUVM->aCpus[iCpu].vm.s.ThreadEMT = hThread;
269 }
270 }
271
272 /* Switch to the terminated state, clearing the VM pointer and finally destroy the VM. */
273 vmR3SetTerminated(pVM);
274
275 pUVM->pVM = NULL;
276
277 int rc2 = SUPR3CallVMMR0Ex(pVM->pVMR0, 0 /*idCpu*/, VMMR0_DO_GVMM_DESTROY_VM, 0, NULL);
278 AssertLogRelRC(rc2);
279 }
280 /* Deregister the EMT with VMMR0. */
281 else if ( idCpu != 0
282 && (pVM = pUVM->pVM) != NULL)
283 {
284 int rc2 = SUPR3CallVMMR0Ex(pVM->pVMR0, idCpu, VMMR0_DO_GVMM_DEREGISTER_VMCPU, 0, NULL);
285 AssertLogRelRC(rc2);
286 }
287
288 if ( pUVM->pVmm2UserMethods
289 && pUVM->pVmm2UserMethods->pfnNotifyEmtTerm)
290 pUVM->pVmm2UserMethods->pfnNotifyEmtTerm(pUVM->pVmm2UserMethods, pUVM, pUVCpu);
291
292 pUVCpu->vm.s.NativeThreadEMT = NIL_RTNATIVETHREAD;
293 Log(("vmR3EmulationThread: EMT is terminated.\n"));
294 return rc;
295}
296
297
298/**
299 * Gets the name of a halt method.
300 *
301 * @returns Pointer to a read only string.
302 * @param enmMethod The method.
303 */
304static const char *vmR3GetHaltMethodName(VMHALTMETHOD enmMethod)
305{
306 switch (enmMethod)
307 {
308 case VMHALTMETHOD_BOOTSTRAP: return "bootstrap";
309 case VMHALTMETHOD_DEFAULT: return "default";
310 case VMHALTMETHOD_OLD: return "old";
311 case VMHALTMETHOD_1: return "method1";
312 //case VMHALTMETHOD_2: return "method2";
313 case VMHALTMETHOD_GLOBAL_1: return "global1";
314 default: return "unknown";
315 }
316}
317
318
319/**
320 * Signal a fatal wait error.
321 *
322 * @returns Fatal error code to be propagated up the call stack.
323 * @param pUVCpu The user mode per CPU structure of the calling
324 * EMT.
325 * @param pszFmt The error format with a single %Rrc in it.
326 * @param rcFmt The status code to format.
327 */
328static int vmR3FatalWaitError(PUVMCPU pUVCpu, const char *pszFmt, int rcFmt)
329{
330 /** @todo This is wrong ... raise a fatal error / guru meditation
331 * instead. */
332 AssertLogRelMsgFailed((pszFmt, rcFmt));
333 ASMAtomicUoWriteBool(&pUVCpu->pUVM->vm.s.fTerminateEMT, true);
334 if (pUVCpu->pVM)
335 VM_FF_SET(pUVCpu->pVM, VM_FF_CHECK_VM_STATE);
336 return VERR_VM_FATAL_WAIT_ERROR;
337}
338
339
340/**
341 * The old halt loop.
342 */
343static DECLCALLBACK(int) vmR3HaltOldDoHalt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t /* u64Now*/)
344{
345 /*
346 * Halt loop.
347 */
348 PVM pVM = pUVCpu->pVM;
349 PVMCPU pVCpu = pUVCpu->pVCpu;
350
351 int rc = VINF_SUCCESS;
352 ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
353 //unsigned cLoops = 0;
354 for (;;)
355 {
356 /*
357 * Work the timers and check if we can exit.
358 * The poll call gives us the ticks left to the next event in
359 * addition to perhaps set an FF.
360 */
361 uint64_t const u64StartTimers = RTTimeNanoTS();
362 TMR3TimerQueuesDo(pVM);
363 uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
364 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
365 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
366 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
367 break;
368 uint64_t u64NanoTS;
369 TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
370 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
371 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
372 break;
373
374 /*
375 * Wait for a while. Someone will wake us up or interrupt the call if
376 * anything needs our attention.
377 */
378 if (u64NanoTS < 50000)
379 {
380 //RTLogPrintf("u64NanoTS=%RI64 cLoops=%d spin\n", u64NanoTS, cLoops++);
381 /* spin */;
382 }
383 else
384 {
385 VMMR3YieldStop(pVM);
386 //uint64_t u64Start = RTTimeNanoTS();
387 if (u64NanoTS < 870000) /* this is a bit speculative... works fine on linux. */
388 {
389 //RTLogPrintf("u64NanoTS=%RI64 cLoops=%d yield", u64NanoTS, cLoops++);
390 uint64_t const u64StartSchedYield = RTTimeNanoTS();
391 RTThreadYield(); /* this is the best we can do here */
392 uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
393 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
394 }
395 else if (u64NanoTS < 2000000)
396 {
397 //RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep 1ms", u64NanoTS, cLoops++);
398 uint64_t const u64StartSchedHalt = RTTimeNanoTS();
399 rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1);
400 uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
401 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
402 }
403 else
404 {
405 //RTLogPrintf("u64NanoTS=%RI64 cLoops=%d sleep %dms", u64NanoTS, cLoops++, (uint32_t)RT_MIN((u64NanoTS - 500000) / 1000000, 15));
406 uint64_t const u64StartSchedHalt = RTTimeNanoTS();
407 rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, RT_MIN((u64NanoTS - 1000000) / 1000000, 15));
408 uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
409 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
410 }
411 //uint64_t u64Slept = RTTimeNanoTS() - u64Start;
412 //RTLogPrintf(" -> rc=%Rrc in %RU64 ns / %RI64 ns delta\n", rc, u64Slept, u64NanoTS - u64Slept);
413 }
414 if (rc == VERR_TIMEOUT)
415 rc = VINF_SUCCESS;
416 else if (RT_FAILURE(rc))
417 {
418 rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
419 break;
420 }
421 }
422
423 ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
424 return rc;
425}
426
427
428/**
429 * Initialize the configuration of halt method 1 & 2.
430 *
431 * @return VBox status code. Failure on invalid CFGM data.
432 * @param pUVM The user mode VM structure.
433 */
434static int vmR3HaltMethod12ReadConfigU(PUVM pUVM)
435{
436 /*
437 * The defaults.
438 */
439#if 1 /* DEBUGGING STUFF - REMOVE LATER */
440 pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
441 pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 2*1000000;
442 pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 75*1000000;
443 pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 30*1000000;
444 pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 20*1000000;
445#else
446 pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = 4;
447 pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = 5*1000000;
448 pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = 200*1000000;
449 pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = 20*1000000;
450 pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = 2*1000000;
451#endif
452
453 /*
454 * Query overrides.
455 *
456 * I don't have time to bother with niceties such as invalid value checks
457 * here right now. sorry.
458 */
459 PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedMethod1");
460 if (pCfg)
461 {
462 uint32_t u32;
463 if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "LagBlockIntervalDivisor", &u32)))
464 pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg = u32;
465 if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MinBlockInterval", &u32)))
466 pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg = u32;
467 if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "MaxBlockInterval", &u32)))
468 pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg = u32;
469 if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StartSpinning", &u32)))
470 pUVM->vm.s.Halt.Method12.u32StartSpinningCfg = u32;
471 if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "StopSpinning", &u32)))
472 pUVM->vm.s.Halt.Method12.u32StopSpinningCfg = u32;
473 LogRel(("VMEmt: HaltedMethod1 config: %d/%d/%d/%d/%d\n",
474 pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
475 pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
476 pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg,
477 pUVM->vm.s.Halt.Method12.u32StartSpinningCfg,
478 pUVM->vm.s.Halt.Method12.u32StopSpinningCfg));
479 }
480
481 return VINF_SUCCESS;
482}
483
484
485/**
486 * Initialize halt method 1.
487 *
488 * @return VBox status code.
489 * @param pUVM Pointer to the user mode VM structure.
490 */
491static DECLCALLBACK(int) vmR3HaltMethod1Init(PUVM pUVM)
492{
493 return vmR3HaltMethod12ReadConfigU(pUVM);
494}
495
496
497/**
498 * Method 1 - Block whenever possible, and when lagging behind
499 * switch to spinning for 10-30ms with occasional blocking until
500 * the lag has been eliminated.
501 */
502static DECLCALLBACK(int) vmR3HaltMethod1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
503{
504 PUVM pUVM = pUVCpu->pUVM;
505 PVMCPU pVCpu = pUVCpu->pVCpu;
506 PVM pVM = pUVCpu->pVM;
507
508 /*
509 * To simplify things, we decide up-front whether we should switch to spinning or
510 * not. This makes some ASSUMPTIONS about the cause of the spinning (PIT/RTC/PCNet)
511 * and that it will generate interrupts or other events that will cause us to exit
512 * the halt loop.
513 */
514 bool fBlockOnce = false;
515 bool fSpinning = false;
516 uint32_t u32CatchUpPct = TMVirtualSyncGetCatchUpPct(pVM);
517 if (u32CatchUpPct /* non-zero if catching up */)
518 {
519 if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
520 {
521 fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StopSpinningCfg;
522 if (fSpinning)
523 {
524 uint64_t u64Lag = TMVirtualSyncGetLag(pVM);
525 fBlockOnce = u64Now - pUVCpu->vm.s.Halt.Method12.u64LastBlockTS
526 > RT_MAX(pUVM->vm.s.Halt.Method12.u32MinBlockIntervalCfg,
527 RT_MIN(u64Lag / pUVM->vm.s.Halt.Method12.u32LagBlockIntervalDivisorCfg,
528 pUVM->vm.s.Halt.Method12.u32MaxBlockIntervalCfg));
529 }
530 else
531 {
532 //RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
533 pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
534 }
535 }
536 else
537 {
538 fSpinning = TMVirtualSyncGetLag(pVM) >= pUVM->vm.s.Halt.Method12.u32StartSpinningCfg;
539 if (fSpinning)
540 pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = u64Now;
541 }
542 }
543 else if (pUVCpu->vm.s.Halt.Method12.u64StartSpinTS)
544 {
545 //RTLogRelPrintf("Stopped spinning (%u ms)\n", (u64Now - pUVCpu->vm.s.Halt.Method12.u64StartSpinTS) / 1000000);
546 pUVCpu->vm.s.Halt.Method12.u64StartSpinTS = 0;
547 }
548
549 /*
550 * Halt loop.
551 */
552 int rc = VINF_SUCCESS;
553 ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
554 unsigned cLoops = 0;
555 for (;; cLoops++)
556 {
557 /*
558 * Work the timers and check if we can exit.
559 */
560 uint64_t const u64StartTimers = RTTimeNanoTS();
561 TMR3TimerQueuesDo(pVM);
562 uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
563 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
564 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
565 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
566 break;
567
568 /*
569 * Estimate time left to the next event.
570 */
571 uint64_t u64NanoTS;
572 TMTimerPollGIP(pVM, pVCpu, &u64NanoTS);
573 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
574 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
575 break;
576
577 /*
578 * Block if we're not spinning and the interval isn't all that small.
579 */
580 if ( ( !fSpinning
581 || fBlockOnce)
582#if 1 /* DEBUGGING STUFF - REMOVE LATER */
583 && u64NanoTS >= 100000) /* 0.100 ms */
584#else
585 && u64NanoTS >= 250000) /* 0.250 ms */
586#endif
587 {
588 const uint64_t Start = pUVCpu->vm.s.Halt.Method12.u64LastBlockTS = RTTimeNanoTS();
589 VMMR3YieldStop(pVM);
590
591 uint32_t cMilliSecs = RT_MIN(u64NanoTS / 1000000, 15);
592 if (cMilliSecs <= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg)
593 cMilliSecs = 1;
594 else
595 cMilliSecs -= pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg;
596
597 //RTLogRelPrintf("u64NanoTS=%RI64 cLoops=%3d sleep %02dms (%7RU64) ", u64NanoTS, cLoops, cMilliSecs, u64NanoTS);
598 uint64_t const u64StartSchedHalt = RTTimeNanoTS();
599 rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, cMilliSecs);
600 uint64_t const cNsElapsedSchedHalt = RTTimeNanoTS() - u64StartSchedHalt;
601 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
602
603 if (rc == VERR_TIMEOUT)
604 rc = VINF_SUCCESS;
605 else if (RT_FAILURE(rc))
606 {
607 rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
608 break;
609 }
610
611 /*
612 * Calc the statistics.
613 * Update averages every 16th time, and flush parts of the history every 64th time.
614 */
615 const uint64_t Elapsed = RTTimeNanoTS() - Start;
616 pUVCpu->vm.s.Halt.Method12.cNSBlocked += Elapsed;
617 if (Elapsed > u64NanoTS)
618 pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong += Elapsed - u64NanoTS;
619 pUVCpu->vm.s.Halt.Method12.cBlocks++;
620 if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0xf))
621 {
622 pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong / pUVCpu->vm.s.Halt.Method12.cBlocks;
623 if (!(pUVCpu->vm.s.Halt.Method12.cBlocks & 0x3f))
624 {
625 pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLong = pUVCpu->vm.s.Halt.Method12.cNSBlockedTooLongAvg * 0x40;
626 pUVCpu->vm.s.Halt.Method12.cBlocks = 0x40;
627 }
628 }
629 //RTLogRelPrintf(" -> %7RU64 ns / %7RI64 ns delta%s\n", Elapsed, Elapsed - u64NanoTS, fBlockOnce ? " (block once)" : "");
630
631 /*
632 * Clear the block once flag if we actually blocked.
633 */
634 if ( fBlockOnce
635 && Elapsed > 100000 /* 0.1 ms */)
636 fBlockOnce = false;
637 }
638 }
639 //if (fSpinning) RTLogRelPrintf("spun for %RU64 ns %u loops; lag=%RU64 pct=%d\n", RTTimeNanoTS() - u64Now, cLoops, TMVirtualSyncGetLag(pVM), u32CatchUpPct);
640
641 ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
642 return rc;
643}
644
645
646/**
647 * Initialize the global 1 halt method.
648 *
649 * @return VBox status code.
650 * @param pUVM Pointer to the user mode VM structure.
651 */
652static DECLCALLBACK(int) vmR3HaltGlobal1Init(PUVM pUVM)
653{
654 /*
655 * The defaults.
656 */
657 uint32_t cNsResolution = SUPSemEventMultiGetResolution(pUVM->vm.s.pSession);
658 if (cNsResolution > 5*RT_NS_100US)
659 pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 50000;
660 else if (cNsResolution > RT_NS_100US)
661 pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = cNsResolution / 4;
662 else
663 pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = 2000;
664
665 /*
666 * Query overrides.
667 *
668 * I don't have time to bother with niceties such as invalid value checks
669 * here right now. sorry.
670 */
671 PCFGMNODE pCfg = CFGMR3GetChild(CFGMR3GetRoot(pUVM->pVM), "/VMM/HaltedGlobal1");
672 if (pCfg)
673 {
674 uint32_t u32;
675 if (RT_SUCCESS(CFGMR3QueryU32(pCfg, "SpinBlockThreshold", &u32)))
676 pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg = u32;
677 }
678 LogRel(("VMEmt: HaltedGlobal1 config: cNsSpinBlockThresholdCfg=%u\n",
679 pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg));
680 return VINF_SUCCESS;
681}
682
683
684/**
685 * The global 1 halt method - Block in GMM (ring-0) and let it
686 * try take care of the global scheduling of EMT threads.
687 */
688static DECLCALLBACK(int) vmR3HaltGlobal1Halt(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now)
689{
690 PUVM pUVM = pUVCpu->pUVM;
691 PVMCPU pVCpu = pUVCpu->pVCpu;
692 PVM pVM = pUVCpu->pVM;
693 Assert(VMMGetCpu(pVM) == pVCpu);
694 NOREF(u64Now);
695
696 /*
697 * Halt loop.
698 */
699 //uint64_t u64NowLog, u64Start;
700 //u64Start = u64NowLog = RTTimeNanoTS();
701 int rc = VINF_SUCCESS;
702 ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
703 unsigned cLoops = 0;
704 for (;; cLoops++)
705 {
706 /*
707 * Work the timers and check if we can exit.
708 */
709 uint64_t const u64StartTimers = RTTimeNanoTS();
710 TMR3TimerQueuesDo(pVM);
711 uint64_t const cNsElapsedTimers = RTTimeNanoTS() - u64StartTimers;
712 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltTimers, cNsElapsedTimers);
713 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
714 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
715 break;
716
717 /*
718 * Estimate time left to the next event.
719 */
720 //u64NowLog = RTTimeNanoTS();
721 uint64_t u64Delta;
722 uint64_t u64GipTime = TMTimerPollGIP(pVM, pVCpu, &u64Delta);
723 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
724 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
725 break;
726
727 /*
728 * Block if we're not spinning and the interval isn't all that small.
729 */
730 if (u64Delta >= pUVM->vm.s.Halt.Global1.cNsSpinBlockThresholdCfg)
731 {
732 VMMR3YieldStop(pVM);
733 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
734 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
735 break;
736
737 //RTLogPrintf("loop=%-3d u64GipTime=%'llu / %'llu now=%'llu / %'llu\n", cLoops, u64GipTime, u64Delta, u64NowLog, u64GipTime - u64NowLog);
738 uint64_t const u64StartSchedHalt = RTTimeNanoTS();
739 rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, u64GipTime, NULL);
740 uint64_t const u64EndSchedHalt = RTTimeNanoTS();
741 uint64_t const cNsElapsedSchedHalt = u64EndSchedHalt - u64StartSchedHalt;
742 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlock, cNsElapsedSchedHalt);
743
744 if (rc == VERR_INTERRUPTED)
745 rc = VINF_SUCCESS;
746 else if (RT_FAILURE(rc))
747 {
748 rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Halt: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
749 break;
750 }
751 else
752 {
753 int64_t const cNsOverslept = u64EndSchedHalt - u64GipTime;
754 if (cNsOverslept > 50000)
755 STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOverslept, cNsOverslept);
756 else if (cNsOverslept < -50000)
757 STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockInsomnia, cNsElapsedSchedHalt);
758 else
759 STAM_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltBlockOnTime, cNsElapsedSchedHalt);
760 }
761 }
762 /*
763 * When spinning call upon the GVMM and do some wakups once
764 * in a while, it's not like we're actually busy or anything.
765 */
766 else if (!(cLoops & 0x1fff))
767 {
768 uint64_t const u64StartSchedYield = RTTimeNanoTS();
769 rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POLL, false /* don't yield */, NULL);
770 uint64_t const cNsElapsedSchedYield = RTTimeNanoTS() - u64StartSchedYield;
771 STAM_REL_PROFILE_ADD_PERIOD(&pUVCpu->vm.s.StatHaltYield, cNsElapsedSchedYield);
772 }
773 }
774 //RTLogPrintf("*** %u loops %'llu; lag=%RU64\n", cLoops, u64NowLog - u64Start, TMVirtualSyncGetLag(pVM));
775
776 ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
777 return rc;
778}
779
780
781/**
782 * The global 1 halt method - VMR3Wait() worker.
783 *
784 * @returns VBox status code.
785 * @param pUVCpu Pointer to the user mode VMCPU structure.
786 */
787static DECLCALLBACK(int) vmR3HaltGlobal1Wait(PUVMCPU pUVCpu)
788{
789 ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
790
791 PVM pVM = pUVCpu->pUVM->pVM;
792 PVMCPU pVCpu = VMMGetCpu(pVM);
793 Assert(pVCpu->idCpu == pUVCpu->idCpu);
794
795 int rc = VINF_SUCCESS;
796 for (;;)
797 {
798 /*
799 * Check Relevant FFs.
800 */
801 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
802 || VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
803 break;
804
805 /*
806 * Wait for a while. Someone will wake us up or interrupt the call if
807 * anything needs our attention.
808 */
809 rc = SUPR3CallVMMR0Ex(pVM->pVMR0, pVCpu->idCpu, VMMR0_DO_GVMM_SCHED_HALT, RTTimeNanoTS() + 1000000000 /* +1s */, NULL);
810 if (rc == VERR_INTERRUPTED)
811 rc = VINF_SUCCESS;
812 else if (RT_FAILURE(rc))
813 {
814 rc = vmR3FatalWaitError(pUVCpu, "vmR3HaltGlobal1Wait: VMMR0_DO_GVMM_SCHED_HALT->%Rrc\n", rc);
815 break;
816 }
817 }
818
819 ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
820 return rc;
821}
822
823
824/**
825 * The global 1 halt method - VMR3NotifyFF() worker.
826 *
827 * @param pUVCpu Pointer to the user mode VMCPU structure.
828 * @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
829 */
830static DECLCALLBACK(void) vmR3HaltGlobal1NotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
831{
832 if (pUVCpu->vm.s.fWait)
833 {
834 int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_WAKE_UP, 0, NULL);
835 AssertRC(rc);
836 }
837 else if ( ( (fFlags & VMNOTIFYFF_FLAGS_POKE)
838 || !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
839 && pUVCpu->pVCpu)
840 {
841 VMCPUSTATE enmState = VMCPU_GET_STATE(pUVCpu->pVCpu);
842 if (enmState == VMCPUSTATE_STARTED_EXEC)
843 {
844 if (fFlags & VMNOTIFYFF_FLAGS_POKE)
845 {
846 int rc = SUPR3CallVMMR0Ex(pUVCpu->pVM->pVMR0, pUVCpu->idCpu, VMMR0_DO_GVMM_SCHED_POKE, 0, NULL);
847 AssertRC(rc);
848 }
849 }
850#ifdef VBOX_WITH_REM
851 else if (enmState == VMCPUSTATE_STARTED_EXEC_REM)
852 {
853 if (!(fFlags & VMNOTIFYFF_FLAGS_DONE_REM))
854 REMR3NotifyFF(pUVCpu->pVM);
855 }
856#endif
857 }
858}
859
860
861/**
862 * Bootstrap VMR3Wait() worker.
863 *
864 * @returns VBox status code.
865 * @param pUVCpu Pointer to the user mode VMCPU structure.
866 */
867static DECLCALLBACK(int) vmR3BootstrapWait(PUVMCPU pUVCpu)
868{
869 PUVM pUVM = pUVCpu->pUVM;
870
871 ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
872
873 int rc = VINF_SUCCESS;
874 for (;;)
875 {
876 /*
877 * Check Relevant FFs.
878 */
879 if (pUVM->vm.s.pNormalReqs || pUVM->vm.s.pPriorityReqs) /* global requests pending? */
880 break;
881 if (pUVCpu->vm.s.pNormalReqs || pUVCpu->vm.s.pPriorityReqs) /* local requests pending? */
882 break;
883
884 if ( pUVCpu->pVM
885 && ( VM_FF_IS_PENDING(pUVCpu->pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
886 || VMCPU_FF_IS_PENDING(VMMGetCpu(pUVCpu->pVM), VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
887 )
888 )
889 break;
890 if (pUVM->vm.s.fTerminateEMT)
891 break;
892
893 /*
894 * Wait for a while. Someone will wake us up or interrupt the call if
895 * anything needs our attention.
896 */
897 rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
898 if (rc == VERR_TIMEOUT)
899 rc = VINF_SUCCESS;
900 else if (RT_FAILURE(rc))
901 {
902 rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc\n", rc);
903 break;
904 }
905 }
906
907 ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
908 return rc;
909}
910
911
912/**
913 * Bootstrap VMR3NotifyFF() worker.
914 *
915 * @param pUVCpu Pointer to the user mode VMCPU structure.
916 * @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
917 */
918static DECLCALLBACK(void) vmR3BootstrapNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
919{
920 if (pUVCpu->vm.s.fWait)
921 {
922 int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
923 AssertRC(rc);
924 }
925 NOREF(fFlags);
926}
927
928
929/**
930 * Default VMR3Wait() worker.
931 *
932 * @returns VBox status code.
933 * @param pUVCpu Pointer to the user mode VMCPU structure.
934 */
935static DECLCALLBACK(int) vmR3DefaultWait(PUVMCPU pUVCpu)
936{
937 ASMAtomicWriteBool(&pUVCpu->vm.s.fWait, true);
938
939 PVM pVM = pUVCpu->pVM;
940 PVMCPU pVCpu = pUVCpu->pVCpu;
941 int rc = VINF_SUCCESS;
942 for (;;)
943 {
944 /*
945 * Check Relevant FFs.
946 */
947 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
948 || VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK))
949 break;
950
951 /*
952 * Wait for a while. Someone will wake us up or interrupt the call if
953 * anything needs our attention.
954 */
955 rc = RTSemEventWait(pUVCpu->vm.s.EventSemWait, 1000);
956 if (rc == VERR_TIMEOUT)
957 rc = VINF_SUCCESS;
958 else if (RT_FAILURE(rc))
959 {
960 rc = vmR3FatalWaitError(pUVCpu, "RTSemEventWait->%Rrc", rc);
961 break;
962 }
963 }
964
965 ASMAtomicUoWriteBool(&pUVCpu->vm.s.fWait, false);
966 return rc;
967}
968
969
970/**
971 * Default VMR3NotifyFF() worker.
972 *
973 * @param pUVCpu Pointer to the user mode VMCPU structure.
974 * @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
975 */
976static DECLCALLBACK(void) vmR3DefaultNotifyCpuFF(PUVMCPU pUVCpu, uint32_t fFlags)
977{
978 if (pUVCpu->vm.s.fWait)
979 {
980 int rc = RTSemEventSignal(pUVCpu->vm.s.EventSemWait);
981 AssertRC(rc);
982 }
983#ifdef VBOX_WITH_REM
984 else if ( !(fFlags & VMNOTIFYFF_FLAGS_DONE_REM)
985 && pUVCpu->pVCpu
986 && pUVCpu->pVCpu->enmState == VMCPUSTATE_STARTED_EXEC_REM)
987 REMR3NotifyFF(pUVCpu->pVM);
988#else
989 RT_NOREF(fFlags);
990#endif
991}
992
993
994/**
995 * Array with halt method descriptors.
996 * VMINT::iHaltMethod contains an index into this array.
997 */
998static const struct VMHALTMETHODDESC
999{
1000 /** The halt method id. */
1001 VMHALTMETHOD enmHaltMethod;
1002 /** The init function for loading config and initialize variables. */
1003 DECLR3CALLBACKMEMBER(int, pfnInit,(PUVM pUVM));
1004 /** The term function. */
1005 DECLR3CALLBACKMEMBER(void, pfnTerm,(PUVM pUVM));
1006 /** The VMR3WaitHaltedU function. */
1007 DECLR3CALLBACKMEMBER(int, pfnHalt,(PUVMCPU pUVCpu, const uint32_t fMask, uint64_t u64Now));
1008 /** The VMR3WaitU function. */
1009 DECLR3CALLBACKMEMBER(int, pfnWait,(PUVMCPU pUVCpu));
1010 /** The VMR3NotifyCpuFFU function. */
1011 DECLR3CALLBACKMEMBER(void, pfnNotifyCpuFF,(PUVMCPU pUVCpu, uint32_t fFlags));
1012 /** The VMR3NotifyGlobalFFU function. */
1013 DECLR3CALLBACKMEMBER(void, pfnNotifyGlobalFF,(PUVM pUVM, uint32_t fFlags));
1014} g_aHaltMethods[] =
1015{
1016 { VMHALTMETHOD_BOOTSTRAP, NULL, NULL, NULL, vmR3BootstrapWait, vmR3BootstrapNotifyCpuFF, NULL },
1017 { VMHALTMETHOD_OLD, NULL, NULL, vmR3HaltOldDoHalt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
1018 { VMHALTMETHOD_1, vmR3HaltMethod1Init, NULL, vmR3HaltMethod1Halt, vmR3DefaultWait, vmR3DefaultNotifyCpuFF, NULL },
1019 { VMHALTMETHOD_GLOBAL_1, vmR3HaltGlobal1Init, NULL, vmR3HaltGlobal1Halt, vmR3HaltGlobal1Wait, vmR3HaltGlobal1NotifyCpuFF, NULL },
1020};
1021
1022
1023/**
1024 * Notify the emulation thread (EMT) about pending Forced Action (FF).
1025 *
1026 * This function is called by thread other than EMT to make
1027 * sure EMT wakes up and promptly service an FF request.
1028 *
1029 * @param pUVM Pointer to the user mode VM structure.
1030 * @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1031 * @internal
1032 */
1033VMMR3_INT_DECL(void) VMR3NotifyGlobalFFU(PUVM pUVM, uint32_t fFlags)
1034{
1035 LogFlow(("VMR3NotifyGlobalFFU:\n"));
1036 uint32_t iHaldMethod = pUVM->vm.s.iHaltMethod;
1037
1038 if (g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF) /** @todo make mandatory. */
1039 g_aHaltMethods[iHaldMethod].pfnNotifyGlobalFF(pUVM, fFlags);
1040 else
1041 for (VMCPUID iCpu = 0; iCpu < pUVM->cCpus; iCpu++)
1042 g_aHaltMethods[iHaldMethod].pfnNotifyCpuFF(&pUVM->aCpus[iCpu], fFlags);
1043}
1044
1045
1046/**
1047 * Notify the emulation thread (EMT) about pending Forced Action (FF).
1048 *
1049 * This function is called by thread other than EMT to make
1050 * sure EMT wakes up and promptly service an FF request.
1051 *
1052 * @param pUVCpu Pointer to the user mode per CPU VM structure.
1053 * @param fFlags Notification flags, VMNOTIFYFF_FLAGS_*.
1054 * @internal
1055 */
1056VMMR3_INT_DECL(void) VMR3NotifyCpuFFU(PUVMCPU pUVCpu, uint32_t fFlags)
1057{
1058 PUVM pUVM = pUVCpu->pUVM;
1059
1060 LogFlow(("VMR3NotifyCpuFFU:\n"));
1061 g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(pUVCpu, fFlags);
1062}
1063
1064
1065/**
1066 * Halted VM Wait.
1067 * Any external event will unblock the thread.
1068 *
1069 * @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1070 * case an appropriate status code is returned.
1071 * @param pVM The cross context VM structure.
1072 * @param pVCpu The cross context virtual CPU structure.
1073 * @param fIgnoreInterrupts If set the VM_FF_INTERRUPT flags is ignored.
1074 * @thread The emulation thread.
1075 * @remarks Made visible for implementing vmsvga sync register.
1076 * @internal
1077 */
1078VMMR3_INT_DECL(int) VMR3WaitHalted(PVM pVM, PVMCPU pVCpu, bool fIgnoreInterrupts)
1079{
1080 LogFlow(("VMR3WaitHalted: fIgnoreInterrupts=%d\n", fIgnoreInterrupts));
1081
1082 /*
1083 * Check Relevant FFs.
1084 */
1085 const uint32_t fMask = !fIgnoreInterrupts
1086 ? VMCPU_FF_EXTERNAL_HALTED_MASK
1087 : VMCPU_FF_EXTERNAL_HALTED_MASK & ~(VMCPU_FF_UPDATE_APIC | VMCPU_FF_INTERRUPT_APIC | VMCPU_FF_INTERRUPT_PIC);
1088 if ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_HALTED_MASK)
1089 || VMCPU_FF_IS_PENDING(pVCpu, fMask))
1090 {
1091 LogFlow(("VMR3WaitHalted: returns VINF_SUCCESS (FF %#x FFCPU %#x)\n", pVM->fGlobalForcedActions, pVCpu->fLocalForcedActions));
1092 return VINF_SUCCESS;
1093 }
1094
1095 /*
1096 * The yielder is suspended while we're halting, while TM might have clock(s) running
1097 * only at certain times and need to be notified..
1098 */
1099 if (pVCpu->idCpu == 0)
1100 VMMR3YieldSuspend(pVM);
1101 TMNotifyStartOfHalt(pVCpu);
1102
1103 /*
1104 * Record halt averages for the last second.
1105 */
1106 PUVMCPU pUVCpu = pVCpu->pUVCpu;
1107 uint64_t u64Now = RTTimeNanoTS();
1108 int64_t off = u64Now - pUVCpu->vm.s.u64HaltsStartTS;
1109 if (off > 1000000000)
1110 {
1111 if (off > _4G || !pUVCpu->vm.s.cHalts)
1112 {
1113 pUVCpu->vm.s.HaltInterval = 1000000000 /* 1 sec */;
1114 pUVCpu->vm.s.HaltFrequency = 1;
1115 }
1116 else
1117 {
1118 pUVCpu->vm.s.HaltInterval = (uint32_t)off / pUVCpu->vm.s.cHalts;
1119 pUVCpu->vm.s.HaltFrequency = ASMMultU64ByU32DivByU32(pUVCpu->vm.s.cHalts, 1000000000, (uint32_t)off);
1120 }
1121 pUVCpu->vm.s.u64HaltsStartTS = u64Now;
1122 pUVCpu->vm.s.cHalts = 0;
1123 }
1124 pUVCpu->vm.s.cHalts++;
1125
1126 /*
1127 * Do the halt.
1128 */
1129 VMCPU_ASSERT_STATE(pVCpu, VMCPUSTATE_STARTED);
1130 VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED_HALTED);
1131 PUVM pUVM = pUVCpu->pUVM;
1132 int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnHalt(pUVCpu, fMask, u64Now);
1133 VMCPU_SET_STATE(pVCpu, VMCPUSTATE_STARTED);
1134
1135 /*
1136 * Notify TM and resume the yielder
1137 */
1138 TMNotifyEndOfHalt(pVCpu);
1139 if (pVCpu->idCpu == 0)
1140 VMMR3YieldResume(pVM);
1141
1142 LogFlow(("VMR3WaitHalted: returns %Rrc (FF %#x)\n", rc, pVM->fGlobalForcedActions));
1143 return rc;
1144}
1145
1146
1147/**
1148 * Suspended VM Wait.
1149 * Only a handful of forced actions will cause the function to
1150 * return to the caller.
1151 *
1152 * @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1153 * case an appropriate status code is returned.
1154 * @param pUVCpu Pointer to the user mode VMCPU structure.
1155 * @thread The emulation thread.
1156 * @internal
1157 */
1158VMMR3_INT_DECL(int) VMR3WaitU(PUVMCPU pUVCpu)
1159{
1160 LogFlow(("VMR3WaitU:\n"));
1161
1162 /*
1163 * Check Relevant FFs.
1164 */
1165 PVM pVM = pUVCpu->pVM;
1166 PVMCPU pVCpu = pUVCpu->pVCpu;
1167
1168 if ( pVM
1169 && ( VM_FF_IS_PENDING(pVM, VM_FF_EXTERNAL_SUSPENDED_MASK)
1170 || VMCPU_FF_IS_PENDING(pVCpu, VMCPU_FF_EXTERNAL_SUSPENDED_MASK)
1171 )
1172 )
1173 {
1174 LogFlow(("VMR3Wait: returns VINF_SUCCESS (FF %#x)\n", pVM->fGlobalForcedActions));
1175 return VINF_SUCCESS;
1176 }
1177
1178 /*
1179 * Do waiting according to the halt method (so VMR3NotifyFF
1180 * doesn't have to special case anything).
1181 */
1182 PUVM pUVM = pUVCpu->pUVM;
1183 int rc = g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnWait(pUVCpu);
1184 LogFlow(("VMR3WaitU: returns %Rrc (FF %#x)\n", rc, pUVM->pVM ? pUVM->pVM->fGlobalForcedActions : 0));
1185 return rc;
1186}
1187
1188
1189/**
1190 * Interface that PDMR3Suspend, PDMR3PowerOff and PDMR3Reset uses when they wait
1191 * for the handling of asynchronous notifications to complete.
1192 *
1193 * @returns VINF_SUCCESS unless a fatal error occurred. In the latter
1194 * case an appropriate status code is returned.
1195 * @param pUVCpu Pointer to the user mode VMCPU structure.
1196 * @thread The emulation thread.
1197 */
1198VMMR3_INT_DECL(int) VMR3AsyncPdmNotificationWaitU(PUVMCPU pUVCpu)
1199{
1200 LogFlow(("VMR3AsyncPdmNotificationWaitU:\n"));
1201 return VMR3WaitU(pUVCpu);
1202}
1203
1204
1205/**
1206 * Interface that PDM the helper asynchronous notification completed methods
1207 * uses for EMT0 when it is waiting inside VMR3AsyncPdmNotificationWaitU().
1208 *
1209 * @param pUVM Pointer to the user mode VM structure.
1210 */
1211VMMR3_INT_DECL(void) VMR3AsyncPdmNotificationWakeupU(PUVM pUVM)
1212{
1213 LogFlow(("VMR3AsyncPdmNotificationWakeupU:\n"));
1214 VM_FF_SET(pUVM->pVM, VM_FF_REQUEST); /* this will have to do for now. */
1215 g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnNotifyCpuFF(&pUVM->aCpus[0], 0 /*fFlags*/);
1216}
1217
1218
1219/**
1220 * Rendezvous callback that will be called once.
1221 *
1222 * @returns VBox strict status code.
1223 * @param pVM The cross context VM structure.
1224 * @param pVCpu The cross context virtual CPU structure of the calling EMT.
1225 * @param pvUser The new g_aHaltMethods index.
1226 */
1227static DECLCALLBACK(VBOXSTRICTRC) vmR3SetHaltMethodCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
1228{
1229 PUVM pUVM = pVM->pUVM;
1230 uintptr_t i = (uintptr_t)pvUser;
1231 Assert(i < RT_ELEMENTS(g_aHaltMethods));
1232 NOREF(pVCpu);
1233
1234 /*
1235 * Terminate the old one.
1236 */
1237 if ( pUVM->vm.s.enmHaltMethod != VMHALTMETHOD_INVALID
1238 && g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm)
1239 {
1240 g_aHaltMethods[pUVM->vm.s.iHaltMethod].pfnTerm(pUVM);
1241 pUVM->vm.s.enmHaltMethod = VMHALTMETHOD_INVALID;
1242 }
1243
1244 /* Assert that the failure fallback is where we expect. */
1245 Assert(g_aHaltMethods[0].enmHaltMethod == VMHALTMETHOD_BOOTSTRAP);
1246 Assert(!g_aHaltMethods[0].pfnTerm && !g_aHaltMethods[0].pfnInit);
1247
1248 /*
1249 * Init the new one.
1250 */
1251 int rc = VINF_SUCCESS;
1252 memset(&pUVM->vm.s.Halt, 0, sizeof(pUVM->vm.s.Halt));
1253 if (g_aHaltMethods[i].pfnInit)
1254 {
1255 rc = g_aHaltMethods[i].pfnInit(pUVM);
1256 if (RT_FAILURE(rc))
1257 {
1258 /* Fall back on the bootstrap method. This requires no
1259 init/term (see assertion above), and will always work. */
1260 AssertLogRelRC(rc);
1261 i = 0;
1262 }
1263 }
1264
1265 /*
1266 * Commit it.
1267 */
1268 pUVM->vm.s.enmHaltMethod = g_aHaltMethods[i].enmHaltMethod;
1269 ASMAtomicWriteU32(&pUVM->vm.s.iHaltMethod, i);
1270
1271 return rc;
1272}
1273
1274
1275/**
1276 * Changes the halt method.
1277 *
1278 * @returns VBox status code.
1279 * @param pUVM Pointer to the user mode VM structure.
1280 * @param enmHaltMethod The new halt method.
1281 * @thread EMT.
1282 */
1283int vmR3SetHaltMethodU(PUVM pUVM, VMHALTMETHOD enmHaltMethod)
1284{
1285 PVM pVM = pUVM->pVM; Assert(pVM);
1286 VM_ASSERT_EMT(pVM);
1287 AssertReturn(enmHaltMethod > VMHALTMETHOD_INVALID && enmHaltMethod < VMHALTMETHOD_END, VERR_INVALID_PARAMETER);
1288
1289 /*
1290 * Resolve default (can be overridden in the configuration).
1291 */
1292 if (enmHaltMethod == VMHALTMETHOD_DEFAULT)
1293 {
1294 uint32_t u32;
1295 int rc = CFGMR3QueryU32(CFGMR3GetChild(CFGMR3GetRoot(pVM), "VM"), "HaltMethod", &u32);
1296 if (RT_SUCCESS(rc))
1297 {
1298 enmHaltMethod = (VMHALTMETHOD)u32;
1299 if (enmHaltMethod <= VMHALTMETHOD_INVALID || enmHaltMethod >= VMHALTMETHOD_END)
1300 return VMSetError(pVM, VERR_INVALID_PARAMETER, RT_SRC_POS, N_("Invalid VM/HaltMethod value %d"), enmHaltMethod);
1301 }
1302 else if (rc == VERR_CFGM_VALUE_NOT_FOUND || rc == VERR_CFGM_CHILD_NOT_FOUND)
1303 return VMSetError(pVM, rc, RT_SRC_POS, N_("Failed to Query VM/HaltMethod as uint32_t"));
1304 else
1305 enmHaltMethod = VMHALTMETHOD_GLOBAL_1;
1306 //enmHaltMethod = VMHALTMETHOD_1;
1307 //enmHaltMethod = VMHALTMETHOD_OLD;
1308 }
1309 LogRel(("VMEmt: Halt method %s (%d)\n", vmR3GetHaltMethodName(enmHaltMethod), enmHaltMethod));
1310
1311 /*
1312 * Find the descriptor.
1313 */
1314 unsigned i = 0;
1315 while ( i < RT_ELEMENTS(g_aHaltMethods)
1316 && g_aHaltMethods[i].enmHaltMethod != enmHaltMethod)
1317 i++;
1318 AssertReturn(i < RT_ELEMENTS(g_aHaltMethods), VERR_INVALID_PARAMETER);
1319
1320 /*
1321 * This needs to be done while the other EMTs are not sleeping or otherwise messing around.
1322 */
1323 return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, vmR3SetHaltMethodCallback, (void *)(uintptr_t)i);
1324}
1325
1326
1327/**
1328 * Special interface for implementing a HLT-like port on a device.
1329 *
1330 * This can be called directly from device code, provide the device is trusted
1331 * to access the VMM directly. Since we may not have an accurate register set
1332 * and the caller certainly shouldn't (device code does not access CPU
1333 * registers), this function will return when interrupts are pending regardless
1334 * of the actual EFLAGS.IF state.
1335 *
1336 * @returns VBox error status (never informational statuses).
1337 * @param pVM The cross context VM structure.
1338 * @param idCpu The id of the calling EMT.
1339 */
1340VMMR3DECL(int) VMR3WaitForDeviceReady(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 VMCPU_ASSERT_EMT_RETURN(pVCpu, VERR_VM_THREAD_NOT_EMT);
1349
1350 /*
1351 * Tag along with the HLT mechanics for now.
1352 */
1353 int rc = VMR3WaitHalted(pVM, pVCpu, false /*fIgnoreInterrupts*/);
1354 if (RT_SUCCESS(rc))
1355 return VINF_SUCCESS;
1356 return rc;
1357}
1358
1359
1360/**
1361 * Wakes up a CPU that has called VMR3WaitForDeviceReady.
1362 *
1363 * @returns VBox error status (never informational statuses).
1364 * @param pVM The cross context VM structure.
1365 * @param idCpu The id of the calling EMT.
1366 */
1367VMMR3DECL(int) VMR3NotifyCpuDeviceReady(PVM pVM, VMCPUID idCpu)
1368{
1369 /*
1370 * Validate caller and resolve the CPU ID.
1371 */
1372 VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
1373 AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_CPU_ID);
1374 PVMCPU pVCpu = &pVM->aCpus[idCpu];
1375
1376 /*
1377 * Pretend it was an FF that got set since we've got logic for that already.
1378 */
1379 VMR3NotifyCpuFFU(pVCpu->pUVCpu, VMNOTIFYFF_FLAGS_DONE_REM);
1380 return VINF_SUCCESS;
1381}
1382
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