GIMKvm.cpp@ 78126

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1	/* $Id: GIMKvm.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* GIM - Guest Interface Manager, KVM implementation.
4	*/
5
6	/*
7	* Copyright (C) 2015-2019 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_GIM
23	#include <VBox/vmm/gim.h>
24	#include <VBox/vmm/cpum.h>
25	#include <VBox/vmm/hm.h>
26	#include <VBox/vmm/pdmapi.h>
27	#include <VBox/vmm/ssm.h>
28	#include <VBox/vmm/em.h>
29	#include "GIMInternal.h"
30	#include <VBox/vmm/vm.h>
31
32	#include <VBox/disopcode.h>
33	#include <VBox/err.h>
34	#include <VBox/version.h>
35
36	#include <iprt/asm-math.h>
37	#include <iprt/assert.h>
38	#include <iprt/string.h>
39	#include <iprt/mem.h>
40
41
42
43	/*********************************************************************************************************************************
44	* Defined Constants And Macros *
45	*********************************************************************************************************************************/
46
47	/**
48	* GIM KVM saved-state version.
49	*/
50	#define GIM_KVM_SAVED_STATE_VERSION UINT32_C(1)
51
52	/**
53	* VBox internal struct. to passback to EMT rendezvous callback while enabling
54	* the KVM wall-clock.
55	*/
56	typedef struct KVMWALLCLOCKINFO
57	{
58	/** Guest physical address of the wall-clock struct. */
59	RTGCPHYS GCPhysWallClock;
60	} KVMWALLCLOCKINFO;
61	/** Pointer to the wall-clock info. struct. */
62	typedef KVMWALLCLOCKINFO *PKVMWALLCLOCKINFO;
63
64
65	/*********************************************************************************************************************************
66	* Global Variables *
67	*********************************************************************************************************************************/
68	#ifdef VBOX_WITH_STATISTICS
69	# define GIMKVM_MSRRANGE(a_uFirst, a_uLast, a_szName) \
70	{ (a_uFirst), (a_uLast), kCpumMsrRdFn_Gim, kCpumMsrWrFn_Gim, 0, 0, 0, 0, 0, a_szName, { 0 }, { 0 }, { 0 }, { 0 } }
71	#else
72	# define GIMKVM_MSRRANGE(a_uFirst, a_uLast, a_szName) \
73	{ (a_uFirst), (a_uLast), kCpumMsrRdFn_Gim, kCpumMsrWrFn_Gim, 0, 0, 0, 0, 0, a_szName }
74	#endif
75
76	/**
77	* Array of MSR ranges supported by KVM.
78	*/
79	static CPUMMSRRANGE const g_aMsrRanges_Kvm[] =
80	{
81	GIMKVM_MSRRANGE(MSR_GIM_KVM_RANGE0_FIRST, MSR_GIM_KVM_RANGE0_LAST, "KVM range 0"),
82	GIMKVM_MSRRANGE(MSR_GIM_KVM_RANGE1_FIRST, MSR_GIM_KVM_RANGE1_LAST, "KVM range 1")
83	};
84	#undef GIMKVM_MSRRANGE
85
86
87	/**
88	* Initializes the KVM GIM provider.
89	*
90	* @returns VBox status code.
91	* @param pVM The cross context VM structure.
92	*/
93	VMMR3_INT_DECL(int) gimR3KvmInit(PVM pVM)
94	{
95	AssertReturn(pVM, VERR_INVALID_PARAMETER);
96	AssertReturn(pVM->gim.s.enmProviderId == GIMPROVIDERID_KVM, VERR_INTERNAL_ERROR_5);
97
98	int rc;
99	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
100
101	/*
102	* Determine interface capabilities based on the version.
103	*/
104	if (!pVM->gim.s.u32Version)
105	{
106	/* Basic features. */
107	pKvm->uBaseFeat = 0
108	\| GIM_KVM_BASE_FEAT_CLOCK_OLD
109	//\| GIM_KVM_BASE_FEAT_NOP_IO_DELAY
110	//\| GIM_KVM_BASE_FEAT_MMU_OP
111	\| GIM_KVM_BASE_FEAT_CLOCK
112	//\| GIM_KVM_BASE_FEAT_ASYNC_PF
113	//\| GIM_KVM_BASE_FEAT_STEAL_TIME
114	//\| GIM_KVM_BASE_FEAT_PV_EOI
115	\| GIM_KVM_BASE_FEAT_PV_UNHALT
116	;
117	/* Rest of the features are determined in gimR3KvmInitCompleted(). */
118	}
119
120	/*
121	* Expose HVP (Hypervisor Present) bit to the guest.
122	*/
123	CPUMR3SetGuestCpuIdFeature(pVM, CPUMCPUIDFEATURE_HVP);
124
125	/*
126	* Modify the standard hypervisor leaves for KVM.
127	*/
128	CPUMCPUIDLEAF HyperLeaf;
129	RT_ZERO(HyperLeaf);
130	HyperLeaf.uLeaf = UINT32_C(0x40000000);
131	HyperLeaf.uEax = UINT32_C(0x40000001); /* Minimum value for KVM is 0x40000001. */
132	HyperLeaf.uEbx = 0x4B4D564B; /* 'KVMK' */
133	HyperLeaf.uEcx = 0x564B4D56; /* 'VMKV' */
134	HyperLeaf.uEdx = 0x0000004D; /* 'M000' */
135	rc = CPUMR3CpuIdInsert(pVM, &HyperLeaf);
136	AssertLogRelRCReturn(rc, rc);
137
138	/*
139	* Add KVM specific leaves.
140	*/
141	HyperLeaf.uLeaf = UINT32_C(0x40000001);
142	HyperLeaf.uEax = pKvm->uBaseFeat;
143	HyperLeaf.uEbx = 0; /* Reserved */
144	HyperLeaf.uEcx = 0; /* Reserved */
145	HyperLeaf.uEdx = 0; /* Reserved */
146	rc = CPUMR3CpuIdInsert(pVM, &HyperLeaf);
147	AssertLogRelRCReturn(rc, rc);
148
149	/*
150	* Insert all MSR ranges of KVM.
151	*/
152	for (unsigned i = 0; i < RT_ELEMENTS(g_aMsrRanges_Kvm); i++)
153	{
154	rc = CPUMR3MsrRangesInsert(pVM, &g_aMsrRanges_Kvm[i]);
155	AssertLogRelRCReturn(rc, rc);
156	}
157
158	/*
159	* Setup hypercall and #UD handling.
160	* Note! We always need to trap VMCALL/VMMCALL hypercall using #UDs for raw-mode VMs.
161	*/
162	for (VMCPUID i = 0; i < pVM->cCpus; i++)
163	EMSetHypercallInstructionsEnabled(&pVM->aCpus[i], true);
164
165	size_t cbHypercall = 0;
166	rc = GIMQueryHypercallOpcodeBytes(pVM, pKvm->abOpcodeNative, sizeof(pKvm->abOpcodeNative), &cbHypercall, &pKvm->uOpcodeNative);
167	AssertLogRelRCReturn(rc, rc);
168	AssertLogRelReturn(cbHypercall == sizeof(pKvm->abOpcodeNative), VERR_GIM_IPE_1);
169	pKvm->fTrapXcptUD = pKvm->uOpcodeNative != OP_VMCALL \|\| VM_IS_RAW_MODE_ENABLED(pVM);
170
171	return VINF_SUCCESS;
172	}
173
174
175	/**
176	* Initializes remaining bits of the KVM provider.
177	*
178	* This is called after initializing HM and almost all other VMM components.
179	*
180	* @returns VBox status code.
181	* @param pVM The cross context VM structure.
182	*/
183	VMMR3_INT_DECL(int) gimR3KvmInitCompleted(PVM pVM)
184	{
185	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
186	pKvm->cTscTicksPerSecond = TMCpuTicksPerSecond(pVM);
187
188	if (TMR3CpuTickIsFixedRateMonotonic(pVM, true /* fWithParavirtEnabled */))
189	{
190	/** @todo We might want to consider just enabling this bit always. As far
191	* as I can see in the Linux guest, the "TSC_STABLE" bit is only
192	* translated as a "monotonic" bit which even in Async systems we
193	* -should- be reporting a strictly monotonic TSC to the guest. */
194	pKvm->uBaseFeat \|= GIM_KVM_BASE_FEAT_TSC_STABLE;
195
196	CPUMCPUIDLEAF HyperLeaf;
197	RT_ZERO(HyperLeaf);
198	HyperLeaf.uLeaf = UINT32_C(0x40000001);
199	HyperLeaf.uEax = pKvm->uBaseFeat;
200	HyperLeaf.uEbx = 0;
201	HyperLeaf.uEcx = 0;
202	HyperLeaf.uEdx = 0;
203	int rc = CPUMR3CpuIdInsert(pVM, &HyperLeaf);
204	AssertLogRelRCReturn(rc, rc);
205	}
206	return VINF_SUCCESS;
207	}
208
209
210	/**
211	* Terminates the KVM GIM provider.
212	*
213	* @returns VBox status code.
214	* @param pVM The cross context VM structure.
215	*/
216	VMMR3_INT_DECL(int) gimR3KvmTerm(PVM pVM)
217	{
218	gimR3KvmReset(pVM);
219	return VINF_SUCCESS;
220	}
221
222
223	/**
224	* This resets KVM provider MSRs and unmaps whatever KVM regions that
225	* the guest may have mapped.
226	*
227	* This is called when the VM is being reset.
228	*
229	* @param pVM The cross context VM structure.
230	* @thread EMT(0)
231	*/
232	VMMR3_INT_DECL(void) gimR3KvmReset(PVM pVM)
233	{
234	VM_ASSERT_EMT0(pVM);
235	LogRel(("GIM: KVM: Resetting MSRs\n"));
236
237	/*
238	* Reset MSRs.
239	*/
240	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
241	pKvm->u64WallClockMsr = 0;
242	for (VMCPUID iCpu = 0; iCpu < pVM->cCpus; iCpu++)
243	{
244	PGIMKVMCPU pKvmCpu = &pVM->aCpus[iCpu].gim.s.u.KvmCpu;
245	pKvmCpu->u64SystemTimeMsr = 0;
246	pKvmCpu->u32SystemTimeVersion = 0;
247	pKvmCpu->fSystemTimeFlags = 0;
248	pKvmCpu->GCPhysSystemTime = 0;
249	pKvmCpu->uTsc = 0;
250	pKvmCpu->uVirtNanoTS = 0;
251	}
252	}
253
254
255	/**
256	* KVM state-save operation.
257	*
258	* @returns VBox status code.
259	* @param pVM The cross context VM structure.
260	* @param pSSM The saved state handle.
261	*/
262	VMMR3_INT_DECL(int) gimR3KvmSave(PVM pVM, PSSMHANDLE pSSM)
263	{
264	PCGIMKVM pKvm = &pVM->gim.s.u.Kvm;
265
266	/*
267	* Save the KVM SSM version.
268	*/
269	SSMR3PutU32(pSSM, GIM_KVM_SAVED_STATE_VERSION);
270
271	/*
272	* Save per-VCPU data.
273	*/
274	for (uint32_t i = 0; i < pVM->cCpus; i++)
275	{
276	PCGIMKVMCPU pKvmCpu = &pVM->aCpus[i].gim.s.u.KvmCpu;
277	SSMR3PutU64(pSSM, pKvmCpu->u64SystemTimeMsr);
278	SSMR3PutU64(pSSM, pKvmCpu->uTsc);
279	SSMR3PutU64(pSSM, pKvmCpu->uVirtNanoTS);
280	SSMR3PutGCPhys(pSSM, pKvmCpu->GCPhysSystemTime);
281	SSMR3PutU32(pSSM, pKvmCpu->u32SystemTimeVersion);
282	SSMR3PutU8(pSSM, pKvmCpu->fSystemTimeFlags);
283	}
284
285	/*
286	* Save per-VM data.
287	*/
288	SSMR3PutU64(pSSM, pKvm->u64WallClockMsr);
289	return SSMR3PutU32(pSSM, pKvm->uBaseFeat);
290	}
291
292
293	/**
294	* KVM state-load operation, final pass.
295	*
296	* @returns VBox status code.
297	* @param pVM The cross context VM structure.
298	* @param pSSM The saved state handle.
299	*/
300	VMMR3_INT_DECL(int) gimR3KvmLoad(PVM pVM, PSSMHANDLE pSSM)
301	{
302	/*
303	* Load the KVM SSM version first.
304	*/
305	uint32_t uKvmSavedStatVersion;
306	int rc = SSMR3GetU32(pSSM, &uKvmSavedStatVersion);
307	AssertRCReturn(rc, rc);
308	if (uKvmSavedStatVersion != GIM_KVM_SAVED_STATE_VERSION)
309	return SSMR3SetLoadError(pSSM, VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION, RT_SRC_POS,
310	N_("Unsupported KVM saved-state version %u (expected %u)."),
311	uKvmSavedStatVersion, GIM_KVM_SAVED_STATE_VERSION);
312
313	/*
314	* Update the TSC frequency from TM.
315	*/
316	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
317	pKvm->cTscTicksPerSecond = TMCpuTicksPerSecond(pVM);
318
319	/*
320	* Load per-VCPU data.
321	*/
322	for (uint32_t i = 0; i < pVM->cCpus; i++)
323	{
324	PVMCPU pVCpu = &pVM->aCpus[i];
325	PGIMKVMCPU pKvmCpu = &pVCpu->gim.s.u.KvmCpu;
326
327	SSMR3GetU64(pSSM, &pKvmCpu->u64SystemTimeMsr);
328	SSMR3GetU64(pSSM, &pKvmCpu->uTsc);
329	SSMR3GetU64(pSSM, &pKvmCpu->uVirtNanoTS);
330	SSMR3GetGCPhys(pSSM, &pKvmCpu->GCPhysSystemTime);
331	SSMR3GetU32(pSSM, &pKvmCpu->u32SystemTimeVersion);
332	rc = SSMR3GetU8(pSSM, &pKvmCpu->fSystemTimeFlags);
333	AssertRCReturn(rc, rc);
334
335	/* Enable the system-time struct. if necessary. */
336	/** @todo update guest struct only if cTscTicksPerSecond doesn't match host
337	* anymore. */
338	if (MSR_GIM_KVM_SYSTEM_TIME_IS_ENABLED(pKvmCpu->u64SystemTimeMsr))
339	{
340	Assert(!TMVirtualIsTicking(pVM)); /* paranoia. */
341	Assert(!TMCpuTickIsTicking(pVCpu));
342	gimR3KvmEnableSystemTime(pVM, pVCpu);
343	}
344	}
345
346	/*
347	* Load per-VM data.
348	*/
349	SSMR3GetU64(pSSM, &pKvm->u64WallClockMsr);
350	rc = SSMR3GetU32(pSSM, &pKvm->uBaseFeat);
351	AssertRCReturn(rc, rc);
352
353	return VINF_SUCCESS;
354	}
355
356
357	/**
358	* Enables the KVM VCPU system-time structure.
359	*
360	* @returns VBox status code.
361	* @param pVM The cross context VM structure.
362	* @param pVCpu The cross context virtual CPU structure.
363	*
364	* @remarks Don't do any release assertions here, these can be triggered by
365	* guest R0 code.
366	*/
367	VMMR3_INT_DECL(int) gimR3KvmEnableSystemTime(PVM pVM, PVMCPU pVCpu)
368	{
369	PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
370	PGIMKVMCPU pKvmCpu = &pVCpu->gim.s.u.KvmCpu;
371
372	/*
373	* Validate the mapping address first.
374	*/
375	if (!PGMPhysIsGCPhysNormal(pVM, pKvmCpu->GCPhysSystemTime))
376	{
377	LogRel(("GIM: KVM: VCPU%3d: Invalid physical addr requested for mapping system-time struct. GCPhysSystemTime=%#RGp\n",
378	pVCpu->idCpu, pKvmCpu->GCPhysSystemTime));
379	return VERR_GIM_OPERATION_FAILED;
380	}
381
382	/*
383	* Construct the system-time struct.
384	*/
385	GIMKVMSYSTEMTIME SystemTime;
386	RT_ZERO(SystemTime);
387	SystemTime.u32Version = pKvmCpu->u32SystemTimeVersion;
388	SystemTime.u64NanoTS = pKvmCpu->uVirtNanoTS;
389	SystemTime.u64Tsc = pKvmCpu->uTsc;
390	SystemTime.fFlags = pKvmCpu->fSystemTimeFlags \| GIM_KVM_SYSTEM_TIME_FLAGS_TSC_STABLE;
391
392	/*
393	* How the guest calculates the system time (nanoseconds):
394	*
395	* tsc = rdtsc - SysTime.u64Tsc
396	* if (SysTime.i8TscShift >= 0)
397	* tsc <<= i8TscShift;
398	* else
399	* tsc >>= -i8TscShift;
400	* time = ((tsc * SysTime.u32TscScale) >> 32) + SysTime.u64NanoTS
401	*/
402	uint64_t u64TscFreq = pKvm->cTscTicksPerSecond;
403	SystemTime.i8TscShift = 0;
404	while (u64TscFreq > 2 * RT_NS_1SEC_64)
405	{
406	u64TscFreq >>= 1;
407	SystemTime.i8TscShift--;
408	}
409	uint32_t uTscFreqLo = (uint32_t)u64TscFreq;
410	while (uTscFreqLo <= RT_NS_1SEC)
411	{
412	uTscFreqLo <<= 1;
413	SystemTime.i8TscShift++;
414	}
415	SystemTime.u32TscScale = ASMDivU64ByU32RetU32(RT_NS_1SEC_64 << 32, uTscFreqLo);
416
417	/*
418	* Update guest memory with the system-time struct.
419	*/
420	Assert(!(SystemTime.u32Version & UINT32_C(1)));
421	int rc = PGMPhysSimpleWriteGCPhys(pVM, pKvmCpu->GCPhysSystemTime, &SystemTime, sizeof(GIMKVMSYSTEMTIME));
422	if (RT_SUCCESS(rc))
423	{
424	LogRel(("GIM: KVM: VCPU%3d: Enabled system-time struct. at %#RGp - u32TscScale=%#RX32 i8TscShift=%d uVersion=%#RU32 "
425	"fFlags=%#x uTsc=%#RX64 uVirtNanoTS=%#RX64\n", pVCpu->idCpu, pKvmCpu->GCPhysSystemTime, SystemTime.u32TscScale,
426	SystemTime.i8TscShift, SystemTime.u32Version, SystemTime.fFlags, pKvmCpu->uTsc, pKvmCpu->uVirtNanoTS));
427	TMR3CpuTickParavirtEnable(pVM);
428	}
429	else
430	LogRel(("GIM: KVM: VCPU%3d: Failed to write system-time struct. at %#RGp. rc=%Rrc\n",
431	pVCpu->idCpu, pKvmCpu->GCPhysSystemTime, rc));
432
433	return rc;
434	}
435
436
437	/**
438	* Disables the KVM system-time struct.
439	*
440	* @returns VBox status code.
441	* @param pVM The cross context VM structure.
442	*/
443	VMMR3_INT_DECL(int) gimR3KvmDisableSystemTime(PVM pVM)
444	{
445	TMR3CpuTickParavirtDisable(pVM);
446	return VINF_SUCCESS;
447	}
448
449
450	/**
451	* @callback_method_impl{PFNVMMEMTRENDEZVOUS,
452	* Worker for gimR3KvmEnableWallClock}
453	*/
454	static DECLCALLBACK(VBOXSTRICTRC) gimR3KvmEnableWallClockCallback(PVM pVM, PVMCPU pVCpu, void *pvUser)
455	{
456	PKVMWALLCLOCKINFO pWallClockInfo = (PKVMWALLCLOCKINFO)pvUser; AssertPtr(pWallClockInfo);
457	RTGCPHYS GCPhysWallClock = pWallClockInfo->GCPhysWallClock;
458	RT_NOREF1(pVCpu);
459
460	/*
461	* Read the wall-clock version (sequence) from the guest.
462	*/
463	uint32_t uVersion;
464	Assert(PGMPhysIsGCPhysNormal(pVM, GCPhysWallClock));
465	int rc = PGMPhysSimpleReadGCPhys(pVM, &uVersion, GCPhysWallClock, sizeof(uVersion));
466	if (RT_FAILURE(rc))
467	{
468	LogRel(("GIM: KVM: Failed to read wall-clock struct. version at %#RGp. rc=%Rrc\n", GCPhysWallClock, rc));
469	return rc;
470	}
471
472	/*
473	* Ensure the version is incrementally even.
474	*/
475	/* faster: uVersion = (uVersion \| 1) + 1; */
476	if (!(uVersion & 1))
477	++uVersion;
478	++uVersion;
479
480	/*
481	* Update wall-clock guest struct. with UTC information.
482	*/
483	RTTIMESPEC TimeSpec;
484	int32_t iSec;
485	int32_t iNano;
486	TMR3UtcNow(pVM, &TimeSpec);
487	RTTimeSpecGetSecondsAndNano(&TimeSpec, &iSec, &iNano);
488
489	GIMKVMWALLCLOCK WallClock;
490	RT_ZERO(WallClock);
491	AssertCompile(sizeof(uVersion) == sizeof(WallClock.u32Version));
492	WallClock.u32Version = uVersion;
493	WallClock.u32Sec = iSec;
494	WallClock.u32Nano = iNano;
495
496	/*
497	* Write out the wall-clock struct. to guest memory.
498	*/
499	Assert(!(WallClock.u32Version & 1));
500	rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysWallClock, &WallClock, sizeof(GIMKVMWALLCLOCK));
501	if (RT_SUCCESS(rc))
502	LogRel(("GIM: KVM: Enabled wall-clock struct. at %#RGp - u32Sec=%u u32Nano=%u uVersion=%#RU32\n", GCPhysWallClock,
503	WallClock.u32Sec, WallClock.u32Nano, WallClock.u32Version));
504	else
505	LogRel(("GIM: KVM: Failed to write wall-clock struct. at %#RGp. rc=%Rrc\n", GCPhysWallClock, rc));
506	return rc;
507	}
508
509
510	/**
511	* Enables the KVM wall-clock structure.
512	*
513	* Since the wall-clock can be read by any VCPU but it is a global struct. in
514	* guest-memory, we do an EMT rendezvous here to be on the safe side. The
515	* alternative is to use an MMIO2 region and use the WallClock.u32Version field
516	* for transactional update. However, this MSR is rarely written to (typically
517	* once during bootup) it's currently not a performance issue especially since
518	* we're already in ring-3. If we really wanted better performance in this code
519	* path, we should be doing it in ring-0 with transactional update while make
520	* sure there is only 1 writer as well.
521	*
522	* @returns VBox status code.
523	* @param pVM The cross context VM structure.
524	* @param GCPhysWallClock Where the guest wall-clock structure is located.
525	*
526	* @remarks Don't do any release assertions here, these can be triggered by
527	* guest R0 code.
528	*/
529	VMMR3_INT_DECL(int) gimR3KvmEnableWallClock(PVM pVM, RTGCPHYS GCPhysWallClock)
530	{
531	KVMWALLCLOCKINFO WallClockInfo;
532	WallClockInfo.GCPhysWallClock = GCPhysWallClock;
533	return VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, gimR3KvmEnableWallClockCallback, &WallClockInfo);
534	}
535

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source: vbox/trunk/src/VBox/VMM/VMMR3/GIMKvm.cpp@ 78126

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