GIMKvm.cpp@ 56693

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1	/* $Id: GIMKvm.cpp 56693 2015-06-30 09:17:34Z vboxsync $ */
2	/** @file
3	* GIM - Guest Interface Manager, KVM implementation.
4	*/
5
6	/*
7	* Copyright (C) 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	* Header Files *
20	*******************************************************************************/
21	#define LOG_GROUP LOG_GROUP_GIM
22	#include "GIMInternal.h"
23
24	#include <iprt/asm-math.h>
25	#include <iprt/assert.h>
26	#include <iprt/err.h>
27	#include <iprt/string.h>
28	#include <iprt/mem.h>
29	#include <iprt/spinlock.h>
30
31	#include <VBox/vmm/cpum.h>
32	#include <VBox/disopcode.h>
33	#include <VBox/vmm/ssm.h>
34	#include <VBox/vmm/vm.h>
35	#include <VBox/vmm/hm.h>
36	#include <VBox/vmm/pdmapi.h>
37	#include <VBox/version.h>
38
39
40	/*******************************************************************************
41	* Defined Constants And Macros *
42	*******************************************************************************/
43
44	/**
45	* GIM KVM saved-state version.
46	*/
47	#define GIM_KVM_SAVED_STATE_VERSION UINT32_C(1)
48
49	/**
50	* VBox internal struct. to passback to EMT rendezvous callback while enabling
51	* the KVM wall-clock.
52	*/
53	typedef struct KVMWALLCLOCKINFO
54	{
55	/** Guest physical address of the wall-clock struct. */
56	RTGCPHYS GCPhysWallClock;
57	} KVMWALLCLOCKINFO;
58	/** Pointer to the wall-clock info. struct. */
59	typedef KVMWALLCLOCKINFO *PKVMWALLCLOCKINFO;
60
61	/*******************************************************************************
62	* Global Variables *
63	*******************************************************************************/
64	#ifdef VBOX_WITH_STATISTICS
65	# define GIMKVM_MSRRANGE(a_uFirst, a_uLast, a_szName) \
66	{ (a_uFirst), (a_uLast), kCpumMsrRdFn_Gim, kCpumMsrWrFn_Gim, 0, 0, 0, 0, 0, a_szName, { 0 }, { 0 }, { 0 }, { 0 } }
67	#else
68	# define GIMKVM_MSRRANGE(a_uFirst, a_uLast, a_szName) \
69	{ (a_uFirst), (a_uLast), kCpumMsrRdFn_Gim, kCpumMsrWrFn_Gim, 0, 0, 0, 0, 0, a_szName }
70	#endif
71
72	/**
73	* Array of MSR ranges supported by KVM.
74	*/
75	static CPUMMSRRANGE const g_aMsrRanges_Kvm[] =
76	{
77	GIMKVM_MSRRANGE(MSR_GIM_KVM_RANGE0_START, MSR_GIM_KVM_RANGE0_END, "KVM range 0"),
78	GIMKVM_MSRRANGE(MSR_GIM_KVM_RANGE1_START, MSR_GIM_KVM_RANGE1_END, "KVM range 1")
79	};
80	#undef GIMKVM_MSRRANGE
81
82
83	/**
84	* Initializes the KVM GIM provider.
85	*
86	* @returns VBox status code.
87	* @param pVM Pointer to the VM.
88	* @param uVersion The interface version this VM should use.
89	*/
90	VMMR3_INT_DECL(int) gimR3KvmInit(PVM pVM)
91	{
92	AssertReturn(pVM, VERR_INVALID_PARAMETER);
93	AssertReturn(pVM->gim.s.enmProviderId == GIMPROVIDERID_KVM, VERR_INTERNAL_ERROR_5);
94
95	int rc;
96	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
97
98	/*
99	* Determine interface capabilities based on the version.
100	*/
101	if (!pVM->gim.s.u32Version)
102	{
103	/* Basic features. */
104	pKvm->uBaseFeat = 0
105	\| GIM_KVM_BASE_FEAT_CLOCK_OLD
106	//\| GIM_KVM_BASE_FEAT_NOP_IO_DELAY
107	//\| GIM_KVM_BASE_FEAT_MMU_OP
108	\| GIM_KVM_BASE_FEAT_CLOCK
109	//\| GIM_KVM_BASE_FEAT_ASYNC_PF
110	//\| GIM_KVM_BASE_FEAT_STEAL_TIME
111	//\| GIM_KVM_BASE_FEAT_PV_EOI
112	\| GIM_KVM_BASE_FEAT_PV_UNHALT
113	;
114	/* Rest of the features are determined in gimR3KvmInitCompleted(). */
115	}
116
117	/*
118	* Expose HVP (Hypervisor Present) bit to the guest.
119	*/
120	CPUMSetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_HVP);
121
122	/*
123	* Modify the standard hypervisor leaves for KVM.
124	*/
125	CPUMCPUIDLEAF HyperLeaf;
126	RT_ZERO(HyperLeaf);
127	HyperLeaf.uLeaf = UINT32_C(0x40000000);
128	HyperLeaf.uEax = UINT32_C(0x40000001); /* Minimum value for KVM is 0x40000001. */
129	HyperLeaf.uEbx = 0x4B4D564B; /* 'KVMK' */
130	HyperLeaf.uEcx = 0x564B4D56; /* 'VMKV' */
131	HyperLeaf.uEdx = 0x0000004D; /* 'M000' */
132	rc = CPUMR3CpuIdInsert(pVM, &HyperLeaf);
133	AssertLogRelRCReturn(rc, rc);
134
135	/*
136	* Add KVM specific leaves.
137	*/
138	HyperLeaf.uLeaf = UINT32_C(0x40000001);
139	HyperLeaf.uEax = pKvm->uBaseFeat;
140	HyperLeaf.uEbx = 0; /* Reserved */
141	HyperLeaf.uEcx = 0; /* Reserved */
142	HyperLeaf.uEdx = 0; /* Reserved */
143	rc = CPUMR3CpuIdInsert(pVM, &HyperLeaf);
144	AssertLogRelRCReturn(rc, rc);
145
146	/*
147	* Insert all MSR ranges of KVM.
148	*/
149	for (unsigned i = 0; i < RT_ELEMENTS(g_aMsrRanges_Kvm); i++)
150	{
151	rc = CPUMR3MsrRangesInsert(pVM, &g_aMsrRanges_Kvm[i]);
152	AssertLogRelRCReturn(rc, rc);
153	}
154
155	/*
156	* Setup hypercall and #UD handling.
157	*/
158	for (VMCPUID i = 0; i < pVM->cCpus; i++)
159	VMMHypercallsEnable(&pVM->aCpus[i]);
160
161	if (ASMIsAmdCpu())
162	{
163	pKvm->fTrapXcptUD = true;
164	pKvm->uOpCodeNative = OP_VMMCALL;
165	}
166	else
167	{
168	Assert(ASMIsIntelCpu() \|\| ASMIsViaCentaurCpu());
169	pKvm->fTrapXcptUD = false;
170	pKvm->uOpCodeNative = OP_VMCALL;
171	}
172
173	/* We always need to trap VMCALL/VMMCALL hypercall using #UDs for raw-mode VMs. */
174	if (!HMIsEnabled(pVM))
175	pKvm->fTrapXcptUD = true;
176
177	return VINF_SUCCESS;
178	}
179
180
181	/**
182	* Initializes remaining bits of the KVM provider.
183	*
184	* This is called after initializing HM and almost all other VMM components.
185	*
186	* @returns VBox status code.
187	* @param pVM Pointer to the VM.
188	*/
189	VMMR3_INT_DECL(int) gimR3KvmInitCompleted(PVM pVM)
190	{
191	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
192	pKvm->cTscTicksPerSecond = TMCpuTicksPerSecond(pVM);
193
194	if (TMR3CpuTickIsFixedRateMonotonic(pVM, true /* fWithParavirtEnabled */))
195	{
196	/** @todo We might want to consider just enabling this bit always. As far
197	* as I can see in the Linux guest, the "TSC_STABLE" bit is only
198	* translated as a "monotonic" bit which even in Async systems we
199	* -should- be reporting a strictly monotonic TSC to the guest. */
200	pKvm->uBaseFeat \|= GIM_KVM_BASE_FEAT_TSC_STABLE;
201
202	CPUMCPUIDLEAF HyperLeaf;
203	RT_ZERO(HyperLeaf);
204	HyperLeaf.uLeaf = UINT32_C(0x40000001);
205	HyperLeaf.uEax = pKvm->uBaseFeat;
206	HyperLeaf.uEbx = 0;
207	HyperLeaf.uEcx = 0;
208	HyperLeaf.uEdx = 0;
209	int rc = CPUMR3CpuIdInsert(pVM, &HyperLeaf);
210	AssertLogRelRCReturn(rc, rc);
211	}
212	return VINF_SUCCESS;
213	}
214
215
216	/**
217	* Terminates the KVM GIM provider.
218	*
219	* @returns VBox status code.
220	* @param pVM Pointer to the VM.
221	*/
222	VMMR3_INT_DECL(int) gimR3KvmTerm(PVM pVM)
223	{
224	gimR3KvmReset(pVM);
225	return VINF_SUCCESS;
226	}
227
228
229	/**
230	* Applies relocations to data and code managed by this component.
231	*
232	* This function will be called at init and whenever the VMM need to relocate
233	* itself inside the GC.
234	*
235	* @param pVM Pointer to the VM.
236	* @param offDelta Relocation delta relative to old location.
237	*/
238	VMMR3_INT_DECL(void) gimR3KvmRelocate(PVM pVM, RTGCINTPTR offDelta)
239	{
240	NOREF(pVM); NOREF(offDelta);
241	}
242
243
244	/**
245	* This resets KVM provider MSRs and unmaps whatever KVM regions that
246	* the guest may have mapped.
247	*
248	* This is called when the VM is being reset.
249	*
250	* @param pVM Pointer to the VM.
251	* @thread EMT(0).
252	*/
253	VMMR3_INT_DECL(void) gimR3KvmReset(PVM pVM)
254	{
255	VM_ASSERT_EMT0(pVM);
256	LogRel(("GIM: KVM: Resetting MSRs\n"));
257
258	/*
259	* Reset MSRs.
260	*/
261	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
262	pKvm->u64WallClockMsr = 0;
263	for (VMCPUID iCpu = 0; iCpu < pVM->cCpus; iCpu++)
264	{
265	PGIMKVMCPU pKvmCpu = &pVM->aCpus[iCpu].gim.s.u.KvmCpu;
266	pKvmCpu->u64SystemTimeMsr = 0;
267	}
268	}
269
270
271	/**
272	* KVM state-save operation.
273	*
274	* @returns VBox status code.
275	* @param pVM Pointer to the VM.
276	* @param pSSM Pointer to the SSM handle.
277	*/
278	VMMR3_INT_DECL(int) gimR3KvmSave(PVM pVM, PSSMHANDLE pSSM)
279	{
280	PCGIMKVM pcKvm = &pVM->gim.s.u.Kvm;
281
282	/*
283	* Save the KVM SSM version.
284	*/
285	SSMR3PutU32(pSSM, GIM_KVM_SAVED_STATE_VERSION);
286
287	/*
288	* Save per-VCPU data.
289	*/
290	for (uint32_t i = 0; i < pVM->cCpus; i++)
291	{
292	PCGIMKVMCPU pcKvmCpu = &pVM->aCpus[i].gim.s.u.KvmCpu;
293
294	/* Guest may alter flags (namely GIM_KVM_SYSTEM_TIME_FLAGS_GUEST_PAUSED bit). So re-read them from guest-memory. */
295	GIMKVMSYSTEMTIME SystemTime;
296	RT_ZERO(SystemTime);
297	if (MSR_GIM_KVM_SYSTEM_TIME_IS_ENABLED(pcKvmCpu->u64SystemTimeMsr))
298	{
299	int rc = PGMPhysSimpleReadGCPhys(pVM, &SystemTime, pcKvmCpu->GCPhysSystemTime, sizeof(GIMKVMSYSTEMTIME));
300	AssertRCReturn(rc, rc);
301	}
302
303	SSMR3PutU64(pSSM, pcKvmCpu->u64SystemTimeMsr);
304	SSMR3PutU64(pSSM, pcKvmCpu->uTsc);
305	SSMR3PutU64(pSSM, pcKvmCpu->uVirtNanoTS);
306	SSMR3PutGCPhys(pSSM, pcKvmCpu->GCPhysSystemTime);
307	SSMR3PutU32(pSSM, pcKvmCpu->u32SystemTimeVersion);
308	SSMR3PutU8(pSSM, SystemTime.fFlags);
309	}
310
311	/*
312	* Save per-VM data.
313	*/
314	SSMR3PutU64(pSSM, pcKvm->u64WallClockMsr);
315	return SSMR3PutU32(pSSM, pcKvm->uBaseFeat);
316	}
317
318
319	/**
320	* KVM state-load operation, final pass.
321	*
322	* @returns VBox status code.
323	* @param pVM Pointer to the VM.
324	* @param pSSM Pointer to the SSM handle.
325	* @param uSSMVersion The GIM saved-state version.
326	*/
327	VMMR3_INT_DECL(int) gimR3KvmLoad(PVM pVM, PSSMHANDLE pSSM, uint32_t uSSMVersion)
328	{
329	/*
330	* Load the KVM SSM version first.
331	*/
332	uint32_t uKvmSavedStatVersion;
333	int rc = SSMR3GetU32(pSSM, &uKvmSavedStatVersion);
334	AssertRCReturn(rc, rc);
335	if (uKvmSavedStatVersion != GIM_KVM_SAVED_STATE_VERSION)
336	return SSMR3SetLoadError(pSSM, VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION, RT_SRC_POS,
337	N_("Unsupported KVM saved-state version %u (expected %u)."), uKvmSavedStatVersion,
338	GIM_KVM_SAVED_STATE_VERSION);
339
340	/*
341	* Update the TSC frequency from TM.
342	*/
343	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
344	pKvm->cTscTicksPerSecond = TMCpuTicksPerSecond(pVM);
345
346	/*
347	* Load per-VCPU data.
348	*/
349	for (uint32_t i = 0; i < pVM->cCpus; i++)
350	{
351	PVMCPU pVCpu = &pVM->aCpus[i];
352	PGIMKVMCPU pKvmCpu = &pVCpu->gim.s.u.KvmCpu;
353
354	uint8_t fSystemTimeFlags = 0;
355	SSMR3GetU64(pSSM, &pKvmCpu->u64SystemTimeMsr);
356	SSMR3GetU64(pSSM, &pKvmCpu->uTsc);
357	SSMR3GetU64(pSSM, &pKvmCpu->uVirtNanoTS);
358	SSMR3GetGCPhys(pSSM, &pKvmCpu->GCPhysSystemTime);
359	SSMR3GetU32(pSSM, &pKvmCpu->u32SystemTimeVersion);
360	rc = SSMR3GetU8(pSSM, &fSystemTimeFlags);
361	AssertRCReturn(rc, rc);
362
363	/* Enable the system-time struct. if necessary. */
364	if (MSR_GIM_KVM_SYSTEM_TIME_IS_ENABLED(pKvmCpu->u64SystemTimeMsr))
365	{
366	Assert(!TMVirtualIsTicking(pVM)); /* paranoia. */
367	Assert(!TMCpuTickIsTicking(pVCpu));
368	rc = gimR3KvmEnableSystemTime(pVM, pVCpu, pKvmCpu, fSystemTimeFlags);
369	AssertRCReturn(rc, rc);
370	}
371	}
372
373	/*
374	* Load per-VM data.
375	*/
376	SSMR3GetU64(pSSM, &pKvm->u64WallClockMsr);
377	rc = SSMR3GetU32(pSSM, &pKvm->uBaseFeat);
378	AssertRCReturn(rc, rc);
379
380	return VINF_SUCCESS;
381	}
382
383
384	/**
385	* Enables the KVM VCPU system-time structure.
386	*
387	* @returns VBox status code.
388	* @param pVM Pointer to the VM.
389	* @param pVCpu Pointer to the VMCPU.
390	* @param pKvmCpu Pointer to the GIMKVMCPU with all fields
391	* populated by the caller.
392	* @param fFlags The system-time struct. flags.
393	*
394	* @remarks Don't do any release assertions here, these can be triggered by
395	* guest R0 code.
396	*/
397	VMMR3_INT_DECL(int) gimR3KvmEnableSystemTime(PVM pVM, PVMCPU pVCpu, PGIMKVMCPU pKvmCpu, uint8_t fFlags)
398	{
399	/*
400	* Validate the mapping address first.
401	*/
402	if (!PGMPhysIsGCPhysNormal(pVM, pKvmCpu->GCPhysSystemTime))
403	{
404	LogRel(("GIM: KVM: VCPU%3d: Invalid physical addr requested for mapping system-time struct. GCPhysSystemTime=%#RGp\n",
405	pKvmCpu->GCPhysSystemTime));
406	return VERR_GIM_OPERATION_FAILED;
407	}
408
409	GIMKVMSYSTEMTIME SystemTime;
410	RT_ZERO(SystemTime);
411	SystemTime.u32Version = pKvmCpu->u32SystemTimeVersion;
412	SystemTime.u64NanoTS = pKvmCpu->uVirtNanoTS;
413	SystemTime.u64Tsc = pKvmCpu->uTsc;
414	SystemTime.fFlags = fFlags \| GIM_KVM_SYSTEM_TIME_FLAGS_TSC_STABLE;
415
416	/*
417	* How the guest calculates the system time (nanoseconds):
418	*
419	* tsc = rdtsc - SysTime.u64Tsc
420	* if (SysTime.i8TscShift >= 0)
421	* tsc <<= i8TscShift;
422	* else
423	* tsc >>= -i8TscShift;
424	* time = ((tsc * SysTime.u32TscScale) >> 32) + SysTime.u64NanoTS
425	*/
426	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
427	uint64_t u64TscFreq = pKvm->cTscTicksPerSecond;
428	SystemTime.i8TscShift = 0;
429	while (u64TscFreq > 2 * RT_NS_1SEC_64)
430	{
431	u64TscFreq >>= 1;
432	SystemTime.i8TscShift--;
433	}
434	uint32_t uTscFreqLo = (uint32_t)u64TscFreq;
435	while (uTscFreqLo <= RT_NS_1SEC)
436	{
437	uTscFreqLo <<= 1;
438	SystemTime.i8TscShift++;
439	}
440	SystemTime.u32TscScale = ASMDivU64ByU32RetU32(RT_NS_1SEC_64 << 32, uTscFreqLo);
441
442	Assert(!(SystemTime.u32Version & UINT32_C(1)));
443	int rc = PGMPhysSimpleWriteGCPhys(pVM, pKvmCpu->GCPhysSystemTime, &SystemTime, sizeof(GIMKVMSYSTEMTIME));
444	if (RT_SUCCESS(rc))
445	{
446	LogRel(("GIM: KVM: VCPU%3d: Enabled system-time struct. at %#RGp - u32TscScale=%#RX32 i8TscShift=%d uVersion=%#RU32 "
447	"fFlags=%#x uTsc=%#RX64 uVirtNanoTS=%#RX64\n", pVCpu->idCpu, pKvmCpu->GCPhysSystemTime, SystemTime.u32TscScale,
448	SystemTime.i8TscShift, SystemTime.u32Version, SystemTime.fFlags, pKvmCpu->uTsc, pKvmCpu->uVirtNanoTS));
449	TMR3CpuTickParavirtEnable(pVM);
450	}
451	else
452	LogRel(("GIM: KVM: VCPU%3d: Failed to write system-time struct. at %#RGp. rc=%Rrc\n", pKvmCpu->GCPhysSystemTime, rc));
453
454	return rc;
455	}
456
457
458	/**
459	* Disables the KVM system-time struct.
460	*
461	* @returns VBox status code.
462	* @param pVM Pointer to the VM.
463	*/
464	VMMR3_INT_DECL(int) gimR3KvmDisableSystemTime(PVM pVM)
465	{
466	TMR3CpuTickParavirtDisable(pVM);
467	return VINF_SUCCESS;
468	}
469
470
471	/**
472	* @callback_method_impl{PFNVMMEMTRENDEZVOUS,
473	* Worker for gimR3KvmEnableWallClock}
474	*/
475	static DECLCALLBACK(VBOXSTRICTRC) gimR3KvmEnableWallClockCallback(PVM pVM, PVMCPU pVCpu, void *pvData)
476	{
477	Assert(pvData);
478	PKVMWALLCLOCKINFO pWallClockInfo = (PKVMWALLCLOCKINFO)pvData;
479	RTGCPHYS GCPhysWallClock = pWallClockInfo->GCPhysWallClock;
480
481	/*
482	* Read the wall-clock version (sequence) from the guest.
483	*/
484	uint32_t uVersion;
485	Assert(PGMPhysIsGCPhysNormal(pVM, GCPhysWallClock));
486	int rc = PGMPhysSimpleReadGCPhys(pVM, &uVersion, GCPhysWallClock, sizeof(uVersion));
487	if (RT_FAILURE(rc))
488	{
489	LogRel(("GIM: KVM: Failed to read wall-clock struct. version at %#RGp. rc=%Rrc\n", GCPhysWallClock, rc));
490	return rc;
491	}
492
493	/*
494	* Ensure the version is incrementally even.
495	*/
496	if (!(uVersion & 1))
497	++uVersion;
498	++uVersion;
499
500	/*
501	* Update wall-clock guest struct. with UTC information.
502	*/
503	RTTIMESPEC TimeSpec;
504	int32_t iSec;
505	int32_t iNano;
506	TMR3UtcNow(pVM, &TimeSpec);
507	RTTimeSpecGetSecondsAndNano(&TimeSpec, &iSec, &iNano);
508
509	GIMKVMWALLCLOCK WallClock;
510	RT_ZERO(WallClock);
511	AssertCompile(sizeof(uVersion) == sizeof(WallClock.u32Version));
512	WallClock.u32Version = uVersion;
513	WallClock.u32Sec = iSec;
514	WallClock.u32Nano = iNano;
515
516	/*
517	* Write out the wall-clock struct. to guest memory.
518	*/
519	Assert(!(WallClock.u32Version & 1));
520	rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysWallClock, &WallClock, sizeof(GIMKVMWALLCLOCK));
521	if (RT_SUCCESS(rc))
522	{
523	LogRel(("GIM: KVM: Enabled wall-clock struct. at %#RGp - u32Sec=%u u32Nano=%u uVersion=%#RU32\n", GCPhysWallClock,
524	WallClock.u32Sec, WallClock.u32Nano, WallClock.u32Version));
525	}
526	else
527	LogRel(("GIM: KVM: Failed to write wall-clock struct. at %#RGp. rc=%Rrc\n", GCPhysWallClock, rc));
528	return rc;
529	}
530
531
532	/**
533	* Enables the KVM wall-clock structure.
534	*
535	* Since the wall-clock can be read by any VCPU but it is a global struct. in
536	* guest-memory, we do an EMT rendezvous here to be on the safe side. The
537	* alternative is to use an MMIO2 region and use the WallClock.u32Version field
538	* for transactional update. However, this MSR is rarely written to (typically
539	* once during bootup) it's currently not a performance issue especially since
540	* we're already in ring-3. If we really wanted better performance in this code
541	* path, we should be doing it in ring-0 with transactional update while make
542	* sure there is only 1 writer as well.
543	*
544	* @returns VBox status code.
545	* @param pVM Pointer to the VM.
546	* @param GCPhysWallClock Where the guest wall-clock structure is located.
547	* @param uVersion The version (sequence number) value to use.
548	*
549	* @remarks Don't do any release assertions here, these can be triggered by
550	* guest R0 code.
551	*/
552	VMMR3_INT_DECL(int) gimR3KvmEnableWallClock(PVM pVM, RTGCPHYS GCPhysWallClock)
553	{
554	KVMWALLCLOCKINFO WallClockInfo;
555	WallClockInfo.GCPhysWallClock = GCPhysWallClock;
556	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, gimR3KvmEnableWallClockCallback, &WallClockInfo);
557	}
558

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source: vbox/trunk/src/VBox/VMM/VMMR3/GIMKvm.cpp@ 56693

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