CPUMR0.cpp@ 28800

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1	/* $Id: CPUMR0.cpp 28800 2010-04-27 08:22:32Z vboxsync $ */
2	/** @file
3	* CPUM - Host Context Ring 0.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 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_CPUM
23	#include <VBox/cpum.h>
24	#include "CPUMInternal.h"
25	#include <VBox/vm.h>
26	#include <VBox/x86.h>
27	#include <VBox/err.h>
28	#include <VBox/log.h>
29	#include <VBox/hwaccm.h>
30	#include <iprt/assert.h>
31	#include <iprt/asm.h>
32
33
34
35	/**
36	* Does Ring-0 CPUM initialization.
37	*
38	* This is mainly to check that the Host CPU mode is compatible
39	* with VBox.
40	*
41	* @returns VBox status code.
42	* @param pVM The VM to operate on.
43	*/
44	VMMR0DECL(int) CPUMR0Init(PVM pVM)
45	{
46	LogFlow(("CPUMR0Init: %p\n", pVM));
47
48	/*
49	* Check CR0 & CR4 flags.
50	*/
51	uint32_t u32CR0 = ASMGetCR0();
52	if ((u32CR0 & (X86_CR0_PE \| X86_CR0_PG)) != (X86_CR0_PE \| X86_CR0_PG)) /* a bit paranoid perhaps.. */
53	{
54	Log(("CPUMR0Init: PE or PG not set. cr0=%#x\n", u32CR0));
55	return VERR_UNSUPPORTED_CPU_MODE;
56	}
57
58	/*
59	* Check for sysenter and syscall usage.
60	*/
61	if (ASMHasCpuId())
62	{
63	/*
64	* SYSENTER/SYSEXIT
65	*
66	* Intel docs claim you should test both the flag and family, model &
67	* stepping because some Pentium Pro CPUs have the SEP cpuid flag set,
68	* but don't support it. AMD CPUs may support this feature in legacy
69	* mode, they've banned it from long mode. Since we switch to 32-bit
70	* mode when entering raw-mode context the feature would become
71	* accessible again on AMD CPUs, so we have to check regardless of
72	* host bitness.
73	*/
74	uint32_t u32CpuVersion;
75	uint32_t u32Dummy;
76	uint32_t fFeatures;
77	ASMCpuId(1, &u32CpuVersion, &u32Dummy, &u32Dummy, &fFeatures);
78	uint32_t u32Family = u32CpuVersion >> 8;
79	uint32_t u32Model = (u32CpuVersion >> 4) & 0xF;
80	uint32_t u32Stepping = u32CpuVersion & 0xF;
81	if ( (fFeatures & X86_CPUID_FEATURE_EDX_SEP)
82	&& ( u32Family != 6 /* (> pentium pro) */
83	\|\| u32Model >= 3
84	\|\| u32Stepping >= 3
85	\|\| !ASMIsIntelCpu())
86	)
87	{
88	/*
89	* Read the MSR and see if it's in use or not.
90	*/
91	uint32_t u32 = ASMRdMsr_Low(MSR_IA32_SYSENTER_CS);
92	if (u32)
93	{
94	pVM->cpum.s.fHostUseFlags \|= CPUM_USE_SYSENTER;
95	Log(("CPUMR0Init: host uses sysenter cs=%08x%08x\n", ASMRdMsr_High(MSR_IA32_SYSENTER_CS), u32));
96	}
97	}
98
99	/*
100	* SYSCALL/SYSRET
101	*
102	* This feature is indicated by the SEP bit returned in EDX by CPUID
103	* function 0x80000001. Intel CPUs only supports this feature in
104	* long mode. Since we're not running 64-bit guests in raw-mode there
105	* are no issues with 32-bit intel hosts.
106	*/
107	uint32_t cExt = 0;
108	ASMCpuId(0x80000000, &cExt, &u32Dummy, &u32Dummy, &u32Dummy);
109	if ( cExt >= 0x80000001
110	&& cExt <= 0x8000ffff)
111	{
112	uint32_t fExtFeaturesEDX = ASMCpuId_EDX(0x80000001);
113	if (fExtFeaturesEDX & X86_CPUID_AMD_FEATURE_EDX_SEP)
114	{
115	#ifdef RT_ARCH_X86
116	# ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
117	if (fExtFeaturesEDX & X86_CPUID_AMD_FEATURE_EDX_LONG_MODE)
118	# else
119	if (!ASMIsIntelCpu())
120	# endif
121	#endif
122	{
123	uint64_t fEfer = ASMRdMsr(MSR_K6_EFER);
124	if (fEfer & MSR_K6_EFER_SCE)
125	{
126	pVM->cpum.s.fHostUseFlags \|= CPUM_USE_SYSCALL;
127	Log(("CPUMR0Init: host uses syscall\n"));
128	}
129	}
130	}
131	}
132	}
133
134
135	/*
136	* Check if debug registers are armed.
137	* This ASSUMES that DR7.GD is not set, or that it's handled transparently!
138	*/
139	uint32_t u32DR7 = ASMGetDR7();
140	if (u32DR7 & X86_DR7_ENABLED_MASK)
141	{
142	for (VMCPUID i = 0; i < pVM->cCpus; i++)
143	pVM->aCpus[i].cpum.s.fUseFlags \|= CPUM_USE_DEBUG_REGS_HOST;
144	Log(("CPUMR0Init: host uses debug registers (dr7=%x)\n", u32DR7));
145	}
146
147	return VINF_SUCCESS;
148	}
149
150
151	/**
152	* Lazily sync in the FPU/XMM state
153	*
154	* @returns VBox status code.
155	* @param pVM VM handle.
156	* @param pVCpu VMCPU handle.
157	* @param pCtx CPU context
158	*/
159	VMMR0DECL(int) CPUMR0LoadGuestFPU(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx)
160	{
161	Assert(pVM->cpum.s.CPUFeatures.edx.u1FXSR);
162	Assert(ASMGetCR4() & X86_CR4_OSFSXR);
163
164	/* If the FPU state has already been loaded, then it's a guest trap. */
165	if (pVCpu->cpum.s.fUseFlags & CPUM_USED_FPU)
166	{
167	Assert( ((pCtx->cr0 & (X86_CR0_MP \| X86_CR0_EM \| X86_CR0_TS)) == (X86_CR0_MP \| X86_CR0_EM \| X86_CR0_TS))
168	\|\| ((pCtx->cr0 & (X86_CR0_MP \| X86_CR0_EM \| X86_CR0_TS)) == (X86_CR0_MP \| X86_CR0_TS)));
169	return VINF_EM_RAW_GUEST_TRAP;
170	}
171
172	/*
173	* There are two basic actions:
174	* 1. Save host fpu and restore guest fpu.
175	* 2. Generate guest trap.
176	*
177	* When entering the hypervisor we'll always enable MP (for proper wait
178	* trapping) and TS (for intercepting all fpu/mmx/sse stuff). The EM flag
179	* is taken from the guest OS in order to get proper SSE handling.
180	*
181	*
182	* Actions taken depending on the guest CR0 flags:
183	*
184	* 3 2 1
185	* TS \| EM \| MP \| FPUInstr \| WAIT :: VMM Action
186	* ------------------------------------------------------------------------
187	* 0 \| 0 \| 0 \| Exec \| Exec :: Clear TS & MP, Save HC, Load GC.
188	* 0 \| 0 \| 1 \| Exec \| Exec :: Clear TS, Save HC, Load GC.
189	* 0 \| 1 \| 0 \| #NM \| Exec :: Clear TS & MP, Save HC, Load GC.
190	* 0 \| 1 \| 1 \| #NM \| Exec :: Clear TS, Save HC, Load GC.
191	* 1 \| 0 \| 0 \| #NM \| Exec :: Clear MP, Save HC, Load GC. (EM is already cleared.)
192	* 1 \| 0 \| 1 \| #NM \| #NM :: Go to guest taking trap there.
193	* 1 \| 1 \| 0 \| #NM \| Exec :: Clear MP, Save HC, Load GC. (EM is already set.)
194	* 1 \| 1 \| 1 \| #NM \| #NM :: Go to guest taking trap there.
195	*/
196
197	switch (pCtx->cr0 & (X86_CR0_MP \| X86_CR0_EM \| X86_CR0_TS))
198	{
199	case X86_CR0_MP \| X86_CR0_TS:
200	case X86_CR0_MP \| X86_CR0_EM \| X86_CR0_TS:
201	return VINF_EM_RAW_GUEST_TRAP;
202	default:
203	break;
204	}
205
206	#if HC_ARCH_BITS == 32 && defined(VBOX_WITH_64_BITS_GUESTS) && !defined(VBOX_WITH_HYBRID_32BIT_KERNEL)
207	if (CPUMIsGuestInLongModeEx(pCtx))
208	{
209	Assert(!(pVCpu->cpum.s.fUseFlags & CPUM_SYNC_FPU_STATE));
210
211	/* Save the host state and record the fact (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM). */
212	cpumR0SaveHostFPUState(&pVCpu->cpum.s);
213
214	/* Restore the state on entry as we need to be in 64 bits mode to access the full state. */
215	pVCpu->cpum.s.fUseFlags \|= CPUM_SYNC_FPU_STATE;
216	}
217	else
218	#endif
219	{
220	#ifndef CPUM_CAN_HANDLE_NM_TRAPS_IN_KERNEL_MODE
221	# if defined(VBOX_WITH_HYBRID_32BIT_KERNEL) \|\| defined(VBOX_WITH_KERNEL_USING_XMM) /** @todo remove the #else here and move cpumHandleLazyFPUAsm back to VMMGC after branching out 3.0!!. */
222	Assert(!(pVCpu->cpum.s.fUseFlags & CPUM_MANUAL_XMM_RESTORE));
223	/** @todo Move the FFXR handling down into
224	* cpumR0SaveHostRestoreguestFPUState to optimize the
225	* VBOX_WITH_KERNEL_USING_XMM handling. */
226	/* Clear MSR_K6_EFER_FFXSR or else we'll be unable to save/restore the XMM state with fxsave/fxrstor. */
227	uint64_t SavedEFER = 0;
228	if (pVM->cpum.s.CPUFeaturesExt.edx & X86_CPUID_AMD_FEATURE_EDX_FFXSR)
229	{
230	SavedEFER = ASMRdMsr(MSR_K6_EFER);
231	if (SavedEFER & MSR_K6_EFER_FFXSR)
232	{
233	ASMWrMsr(MSR_K6_EFER, SavedEFER & ~MSR_K6_EFER_FFXSR);
234	pVCpu->cpum.s.fUseFlags \|= CPUM_MANUAL_XMM_RESTORE;
235	}
236	}
237
238	/* Do the job and record that we've switched FPU state. */
239	cpumR0SaveHostRestoreGuestFPUState(&pVCpu->cpum.s);
240
241	/* Restore EFER. */
242	if (pVCpu->cpum.s.fUseFlags & CPUM_MANUAL_XMM_RESTORE)
243	ASMWrMsr(MSR_K6_EFER, SavedEFER);
244
245	# else
246	uint64_t oldMsrEFERHost = 0;
247	uint32_t oldCR0 = ASMGetCR0();
248
249	/* Clear MSR_K6_EFER_FFXSR or else we'll be unable to save/restore the XMM state with fxsave/fxrstor. */
250	if (pVM->cpum.s.CPUFeaturesExt.edx & X86_CPUID_AMD_FEATURE_EDX_FFXSR)
251	{
252	/** @todo Do we really need to read this every time?? The host could change this on the fly though.
253	* bird: what about starting by skipping the ASMWrMsr below if we didn't
254	* change anything? Ditto for the stuff in CPUMR0SaveGuestFPU. */
255	oldMsrEFERHost = ASMRdMsr(MSR_K6_EFER);
256	if (oldMsrEFERHost & MSR_K6_EFER_FFXSR)
257	{
258	ASMWrMsr(MSR_K6_EFER, oldMsrEFERHost & ~MSR_K6_EFER_FFXSR);
259	pVCpu->cpum.s.fUseFlags \|= CPUM_MANUAL_XMM_RESTORE;
260	}
261	}
262
263	/* If we sync the FPU/XMM state on-demand, then we can continue execution as if nothing has happened. */
264	int rc = CPUMHandleLazyFPU(pVCpu);
265	AssertRC(rc);
266	Assert(CPUMIsGuestFPUStateActive(pVCpu));
267
268	/* Restore EFER MSR */
269	if (pVCpu->cpum.s.fUseFlags & CPUM_MANUAL_XMM_RESTORE)
270	ASMWrMsr(MSR_K6_EFER, oldMsrEFERHost);
271
272	/* CPUMHandleLazyFPU could have changed CR0; restore it. */
273	ASMSetCR0(oldCR0);
274	# endif
275
276	#else /* CPUM_CAN_HANDLE_NM_TRAPS_IN_KERNEL_MODE */
277
278	/*
279	* Save the FPU control word and MXCSR, so we can restore the state properly afterwards.
280	* We don't want the guest to be able to trigger floating point/SSE exceptions on the host.
281	*/
282	pVCpu->cpum.s.Host.fpu.FCW = CPUMGetFCW();
283	if (pVM->cpum.s.CPUFeatures.edx.u1SSE)
284	pVCpu->cpum.s.Host.fpu.MXCSR = CPUMGetMXCSR();
285
286	cpumR0LoadFPU(pCtx);
287
288	/*
289	* The MSR_K6_EFER_FFXSR feature is AMD only so far, but check the cpuid just in case Intel adds it in the future.
290	*
291	* MSR_K6_EFER_FFXSR changes the behaviour of fxsave and fxrstore: the XMM state isn't saved/restored
292	*/
293	if (pVM->cpum.s.CPUFeaturesExt.edx & X86_CPUID_AMD_FEATURE_EDX_FFXSR)
294	{
295	/** @todo Do we really need to read this every time?? The host could change this on the fly though. */
296	uint64_t msrEFERHost = ASMRdMsr(MSR_K6_EFER);
297
298	if (msrEFERHost & MSR_K6_EFER_FFXSR)
299	{
300	/* fxrstor doesn't restore the XMM state! */
301	cpumR0LoadXMM(pCtx);
302	pVCpu->cpum.s.fUseFlags \|= CPUM_MANUAL_XMM_RESTORE;
303	}
304	}
305
306	#endif /* CPUM_CAN_HANDLE_NM_TRAPS_IN_KERNEL_MODE */
307	}
308
309	Assert((pVCpu->cpum.s.fUseFlags & (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM)) == (CPUM_USED_FPU \| CPUM_USED_FPU_SINCE_REM));
310	return VINF_SUCCESS;
311	}
312
313
314	/**
315	* Save guest FPU/XMM state
316	*
317	* @returns VBox status code.
318	* @param pVM VM handle.
319	* @param pVCpu VMCPU handle.
320	* @param pCtx CPU context
321	*/
322	VMMR0DECL(int) CPUMR0SaveGuestFPU(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx)
323	{
324	Assert(pVM->cpum.s.CPUFeatures.edx.u1FXSR);
325	Assert(ASMGetCR4() & X86_CR4_OSFSXR);
326	AssertReturn((pVCpu->cpum.s.fUseFlags & CPUM_USED_FPU), VINF_SUCCESS);
327
328	#if HC_ARCH_BITS == 32 && defined(VBOX_WITH_64_BITS_GUESTS) && !defined(VBOX_WITH_HYBRID_32BIT_KERNEL)
329	if (CPUMIsGuestInLongModeEx(pCtx))
330	{
331	if (!(pVCpu->cpum.s.fUseFlags & CPUM_SYNC_FPU_STATE))
332	{
333	HWACCMR0SaveFPUState(pVM, pVCpu, pCtx);
334	cpumR0RestoreHostFPUState(&pVCpu->cpum.s);
335	}
336	/* else nothing to do; we didn't perform a world switch */
337	}
338	else
339	#endif
340	{
341	#ifndef CPUM_CAN_HANDLE_NM_TRAPS_IN_KERNEL_MODE
342	# ifdef VBOX_WITH_KERNEL_USING_XMM
343	/*
344	* We've already saved the XMM registers in the assembly wrapper, so
345	* we have to save them before saving the entire FPU state and put them
346	* back afterwards.
347	*/
348	/** @todo This could be skipped if MSR_K6_EFER_FFXSR is set, but
349	* I'm not able to test such an optimization tonight.
350	* We could just all this in assembly. */
351	uint128_t aGuestXmmRegs[16];
352	memcpy(&aGuestXmmRegs[0], &pVCpu->cpum.s.Guest.fpu.aXMM[0], sizeof(aGuestXmmRegs));
353	# endif
354
355	/* Clear MSR_K6_EFER_FFXSR or else we'll be unable to save/restore the XMM state with fxsave/fxrstor. */
356	uint64_t oldMsrEFERHost = 0;
357	if (pVCpu->cpum.s.fUseFlags & CPUM_MANUAL_XMM_RESTORE)
358	{
359	oldMsrEFERHost = ASMRdMsr(MSR_K6_EFER);
360	ASMWrMsr(MSR_K6_EFER, oldMsrEFERHost & ~MSR_K6_EFER_FFXSR);
361	}
362	cpumR0SaveGuestRestoreHostFPUState(&pVCpu->cpum.s);
363
364	/* Restore EFER MSR */
365	if (pVCpu->cpum.s.fUseFlags & CPUM_MANUAL_XMM_RESTORE)
366	ASMWrMsr(MSR_K6_EFER, oldMsrEFERHost \| MSR_K6_EFER_FFXSR);
367
368	# ifdef VBOX_WITH_KERNEL_USING_XMM
369	memcpy(&pVCpu->cpum.s.Guest.fpu.aXMM[0], &aGuestXmmRegs[0], sizeof(aGuestXmmRegs));
370	# endif
371
372	#else /* CPUM_CAN_HANDLE_NM_TRAPS_IN_KERNEL_MODE */
373	# ifdef VBOX_WITH_KERNEL_USING_XMM
374	# error "Fix all the NM_TRAPS_IN_KERNEL_MODE code path. I'm not going to fix unused code now."
375	# endif
376	cpumR0SaveFPU(pCtx);
377	if (pVCpu->cpum.s.fUseFlags & CPUM_MANUAL_XMM_RESTORE)
378	{
379	/* fxsave doesn't save the XMM state! */
380	cpumR0SaveXMM(pCtx);
381	}
382
383	/*
384	* Restore the original FPU control word and MXCSR.
385	* We don't want the guest to be able to trigger floating point/SSE exceptions on the host.
386	*/
387	cpumR0SetFCW(pVCpu->cpum.s.Host.fpu.FCW);
388	if (pVM->cpum.s.CPUFeatures.edx.u1SSE)
389	cpumR0SetMXCSR(pVCpu->cpum.s.Host.fpu.MXCSR);
390	#endif /* CPUM_CAN_HANDLE_NM_TRAPS_IN_KERNEL_MODE */
391	}
392
393	pVCpu->cpum.s.fUseFlags &= ~(CPUM_USED_FPU \| CPUM_SYNC_FPU_STATE \| CPUM_MANUAL_XMM_RESTORE);
394	return VINF_SUCCESS;
395	}
396
397
398	/**
399	* Save guest debug state
400	*
401	* @returns VBox status code.
402	* @param pVM VM handle.
403	* @param pVCpu VMCPU handle.
404	* @param pCtx CPU context
405	* @param fDR6 Include DR6 or not
406	*/
407	VMMR0DECL(int) CPUMR0SaveGuestDebugState(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, bool fDR6)
408	{
409	Assert(pVCpu->cpum.s.fUseFlags & CPUM_USE_DEBUG_REGS);
410
411	/* Save the guest's debug state. The caller is responsible for DR7. */
412	#if HC_ARCH_BITS == 32 && defined(VBOX_WITH_64_BITS_GUESTS) && !defined(VBOX_WITH_HYBRID_32BIT_KERNEL)
413	if (CPUMIsGuestInLongModeEx(pCtx))
414	{
415	if (!(pVCpu->cpum.s.fUseFlags & CPUM_SYNC_DEBUG_STATE))
416	{
417	uint64_t dr6 = pCtx->dr[6];
418
419	HWACCMR0SaveDebugState(pVM, pVCpu, pCtx);
420	if (!fDR6) /* dr6 was already up-to-date */
421	pCtx->dr[6] = dr6;
422	}
423	}
424	else
425	#endif
426	{
427	#ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
428	cpumR0SaveDRx(&pCtx->dr[0]);
429	#else
430	pCtx->dr[0] = ASMGetDR0();
431	pCtx->dr[1] = ASMGetDR1();
432	pCtx->dr[2] = ASMGetDR2();
433	pCtx->dr[3] = ASMGetDR3();
434	#endif
435	if (fDR6)
436	pCtx->dr[6] = ASMGetDR6();
437	}
438
439	/*
440	* Restore the host's debug state. DR0-3, DR6 and only then DR7!
441	* DR7 contains 0x400 right now.
442	*/
443	CPUMR0LoadHostDebugState(pVM, pVCpu);
444	Assert(!(pVCpu->cpum.s.fUseFlags & CPUM_USE_DEBUG_REGS));
445	return VINF_SUCCESS;
446	}
447
448
449	/**
450	* Lazily sync in the debug state
451	*
452	* @returns VBox status code.
453	* @param pVM VM handle.
454	* @param pVCpu VMCPU handle.
455	* @param pCtx CPU context
456	* @param fDR6 Include DR6 or not
457	*/
458	VMMR0DECL(int) CPUMR0LoadGuestDebugState(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, bool fDR6)
459	{
460	/* Save the host state. */
461	CPUMR0SaveHostDebugState(pVM, pVCpu);
462	Assert(ASMGetDR7() == X86_DR7_INIT_VAL);
463
464	/* Activate the guest state DR0-3; DR7 is left to the caller. */
465	#if HC_ARCH_BITS == 32 && defined(VBOX_WITH_64_BITS_GUESTS) && !defined(VBOX_WITH_HYBRID_32BIT_KERNEL)
466	if (CPUMIsGuestInLongModeEx(pCtx))
467	{
468	/* Restore the state on entry as we need to be in 64 bits mode to access the full state. */
469	pVCpu->cpum.s.fUseFlags \|= CPUM_SYNC_DEBUG_STATE;
470	}
471	else
472	#endif
473	{
474	#ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
475	cpumR0LoadDRx(&pCtx->dr[0]);
476	#else
477	ASMSetDR0(pCtx->dr[0]);
478	ASMSetDR1(pCtx->dr[1]);
479	ASMSetDR2(pCtx->dr[2]);
480	ASMSetDR3(pCtx->dr[3]);
481	#endif
482	if (fDR6)
483	ASMSetDR6(pCtx->dr[6]);
484	}
485
486	pVCpu->cpum.s.fUseFlags \|= CPUM_USE_DEBUG_REGS;
487	return VINF_SUCCESS;
488	}
489
490	/**
491	* Save the host debug state
492	*
493	* @returns VBox status code.
494	* @param pVM VM handle.
495	* @param pVCpu VMCPU handle.
496	*/
497	VMMR0DECL(int) CPUMR0SaveHostDebugState(PVM pVM, PVMCPU pVCpu)
498	{
499	/* Save the host state. */
500	#ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
501	AssertCompile((uintptr_t)&pVCpu->cpum.s.Host.dr3 - (uintptr_t)&pVCpu->cpum.s.Host.dr0 == sizeof(uint64_t) * 3);
502	cpumR0SaveDRx(&pVCpu->cpum.s.Host.dr0);
503	#else
504	pVCpu->cpum.s.Host.dr0 = ASMGetDR0();
505	pVCpu->cpum.s.Host.dr1 = ASMGetDR1();
506	pVCpu->cpum.s.Host.dr2 = ASMGetDR2();
507	pVCpu->cpum.s.Host.dr3 = ASMGetDR3();
508	#endif
509	pVCpu->cpum.s.Host.dr6 = ASMGetDR6();
510	/** @todo dr7 might already have been changed to 0x400; don't care right now as it's harmless. */
511	pVCpu->cpum.s.Host.dr7 = ASMGetDR7();
512	/* Make sure DR7 is harmless or else we could trigger breakpoints when restoring dr0-3 (!) */
513	ASMSetDR7(X86_DR7_INIT_VAL);
514
515	return VINF_SUCCESS;
516	}
517
518	/**
519	* Load the host debug state
520	*
521	* @returns VBox status code.
522	* @param pVM VM handle.
523	* @param pVCpu VMCPU handle.
524	*/
525	VMMR0DECL(int) CPUMR0LoadHostDebugState(PVM pVM, PVMCPU pVCpu)
526	{
527	Assert(pVCpu->cpum.s.fUseFlags & (CPUM_USE_DEBUG_REGS \| CPUM_USE_DEBUG_REGS_HYPER));
528
529	/*
530	* Restore the host's debug state. DR0-3, DR6 and only then DR7!
531	* DR7 contains 0x400 right now.
532	*/
533	#ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
534	AssertCompile((uintptr_t)&pVCpu->cpum.s.Host.dr3 - (uintptr_t)&pVCpu->cpum.s.Host.dr0 == sizeof(uint64_t) * 3);
535	cpumR0LoadDRx(&pVCpu->cpum.s.Host.dr0);
536	#else
537	ASMSetDR0(pVCpu->cpum.s.Host.dr0);
538	ASMSetDR1(pVCpu->cpum.s.Host.dr1);
539	ASMSetDR2(pVCpu->cpum.s.Host.dr2);
540	ASMSetDR3(pVCpu->cpum.s.Host.dr3);
541	#endif
542	ASMSetDR6(pVCpu->cpum.s.Host.dr6);
543	ASMSetDR7(pVCpu->cpum.s.Host.dr7);
544
545	pVCpu->cpum.s.fUseFlags &= ~(CPUM_USE_DEBUG_REGS \| CPUM_USE_DEBUG_REGS_HYPER);
546	return VINF_SUCCESS;
547	}
548
549
550	/**
551	* Lazily sync in the hypervisor debug state
552	*
553	* @returns VBox status code.
554	* @param pVM VM handle.
555	* @param pVCpu VMCPU handle.
556	* @param pCtx CPU context
557	* @param fDR6 Include DR6 or not
558	*/
559	VMMR0DECL(int) CPUMR0LoadHyperDebugState(PVM pVM, PVMCPU pVCpu, PCPUMCTX pCtx, bool fDR6)
560	{
561	/* Save the host state. */
562	CPUMR0SaveHostDebugState(pVM, pVCpu);
563	Assert(ASMGetDR7() == X86_DR7_INIT_VAL);
564
565	/* Activate the guest state DR0-3; DR7 is left to the caller. */
566	#if HC_ARCH_BITS == 32 && defined(VBOX_WITH_64_BITS_GUESTS) && !defined(VBOX_WITH_HYBRID_32BIT_KERNEL)
567	if (CPUMIsGuestInLongModeEx(pCtx))
568	{
569	AssertFailed();
570	return VERR_NOT_IMPLEMENTED;
571	}
572	else
573	#endif
574	{
575	#ifdef VBOX_WITH_HYBRID_32BIT_KERNEL
576	AssertFailed();
577	return VERR_NOT_IMPLEMENTED;
578	#else
579	ASMSetDR0(CPUMGetHyperDR0(pVCpu));
580	ASMSetDR1(CPUMGetHyperDR1(pVCpu));
581	ASMSetDR2(CPUMGetHyperDR2(pVCpu));
582	ASMSetDR3(CPUMGetHyperDR3(pVCpu));
583	#endif
584	if (fDR6)
585	ASMSetDR6(CPUMGetHyperDR6(pVCpu));
586	}
587
588	pVCpu->cpum.s.fUseFlags \|= CPUM_USE_DEBUG_REGS_HYPER;
589	return VINF_SUCCESS;
590	}
591

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source: vbox/trunk/src/VBox/VMM/VMMR0/CPUMR0.cpp@ 28800

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