HMSVMAll.cpp@ 95085

Last change on this file since 95085 was 93725, checked in by vboxsync, 3 years ago
VMM: More arm64 adjustments. bugref:9898
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1	/* $Id: HMSVMAll.cpp 93725 2022-02-14 13:46:16Z vboxsync $ */
2	/** @file
3	* HM SVM (AMD-V) - All contexts.
4	*/
5
6	/*
7	* Copyright (C) 2017-2022 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_HM
23	#define VMCPU_INCL_CPUM_GST_CTX
24	#include "HMInternal.h"
25	#include <VBox/vmm/apic.h>
26	#include <VBox/vmm/gim.h>
27	#include <VBox/vmm/iem.h>
28	#include <VBox/vmm/vmcc.h>
29
30	#include <VBox/err.h>
31	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
32	# include <iprt/asm-amd64-x86.h> /* ASMCpuId */
33	#endif
34
35
36
37	/**
38	* Emulates a simple MOV TPR (CR8) instruction.
39	*
40	* Used for TPR patching on 32-bit guests. This simply looks up the patch record
41	* at EIP and does the required.
42	*
43	* This VMMCALL is used a fallback mechanism when mov to/from cr8 isn't exactly
44	* like how we want it to be (e.g. not followed by shr 4 as is usually done for
45	* TPR). See hmR3ReplaceTprInstr() for the details.
46	*
47	* @returns VBox status code.
48	* @retval VINF_SUCCESS if the access was handled successfully, RIP + RFLAGS updated.
49	* @retval VERR_NOT_FOUND if no patch record for this RIP could be found.
50	* @retval VERR_SVM_UNEXPECTED_PATCH_TYPE if the found patch type is invalid.
51	*
52	* @param pVM The cross context VM structure.
53	* @param pVCpu The cross context virtual CPU structure.
54	*/
55	VMM_INT_DECL(int) hmEmulateSvmMovTpr(PVMCC pVM, PVMCPUCC pVCpu)
56	{
57	PCPUMCTX pCtx = &pVCpu->cpum.GstCtx;
58	Log4(("Emulated VMMCall TPR access replacement at RIP=%RGv\n", pCtx->rip));
59
60	/*
61	* We do this in a loop as we increment the RIP after a successful emulation
62	* and the new RIP may be a patched instruction which needs emulation as well.
63	*/
64	bool fPatchFound = false;
65	for (;;)
66	{
67	PHMTPRPATCH pPatch = (PHMTPRPATCH)RTAvloU32Get(&pVM->hm.s.PatchTree, (AVLOU32KEY)pCtx->eip);
68	if (!pPatch)
69	break;
70	fPatchFound = true;
71
72	uint8_t u8Tpr;
73	switch (pPatch->enmType)
74	{
75	case HMTPRINSTR_READ:
76	{
77	bool fPending;
78	int rc = APICGetTpr(pVCpu, &u8Tpr, &fPending, NULL /* pu8PendingIrq */);
79	AssertRC(rc);
80
81	rc = DISWriteReg32(CPUMCTX2CORE(pCtx), pPatch->uDstOperand, u8Tpr);
82	AssertRC(rc);
83	pCtx->rip += pPatch->cbOp;
84	pCtx->eflags.Bits.u1RF = 0;
85	break;
86	}
87
88	case HMTPRINSTR_WRITE_REG:
89	case HMTPRINSTR_WRITE_IMM:
90	{
91	if (pPatch->enmType == HMTPRINSTR_WRITE_REG)
92	{
93	uint32_t u32Val;
94	int rc = DISFetchReg32(CPUMCTX2CORE(pCtx), pPatch->uSrcOperand, &u32Val);
95	AssertRC(rc);
96	u8Tpr = u32Val;
97	}
98	else
99	u8Tpr = (uint8_t)pPatch->uSrcOperand;
100
101	int rc2 = APICSetTpr(pVCpu, u8Tpr);
102	AssertRC(rc2);
103	pCtx->rip += pPatch->cbOp;
104	pCtx->eflags.Bits.u1RF = 0;
105	ASMAtomicUoOrU64(&pVCpu->hm.s.fCtxChanged, HM_CHANGED_GUEST_APIC_TPR
106	\| HM_CHANGED_GUEST_RIP
107	\| HM_CHANGED_GUEST_RFLAGS);
108	break;
109	}
110
111	default:
112	{
113	AssertMsgFailed(("Unexpected patch type %d\n", pPatch->enmType));
114	pVCpu->hm.s.u32HMError = pPatch->enmType;
115	return VERR_SVM_UNEXPECTED_PATCH_TYPE;
116	}
117	}
118	}
119
120	return fPatchFound ? VINF_SUCCESS : VERR_NOT_FOUND;
121	}
122
123	#ifdef VBOX_WITH_NESTED_HWVIRT_SVM
124	/**
125	* Notification callback for when a \#VMEXIT happens outside SVM R0 code (e.g.
126	* in IEM).
127	*
128	* @param pVCpu The cross context virtual CPU structure.
129	* @param pCtx Pointer to the guest-CPU context.
130	*
131	* @sa hmR0SvmVmRunCacheVmcb.
132	*/
133	VMM_INT_DECL(void) HMNotifySvmNstGstVmexit(PVMCPUCC pVCpu, PCPUMCTX pCtx)
134	{
135	PSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
136	if (pVmcbNstGstCache->fCacheValid)
137	{
138	/*
139	* Restore fields as our own code might look at the VMCB controls as part
140	* of the #VMEXIT handling in IEM. Otherwise, strictly speaking we don't need to
141	* restore these fields because currently none of them are written back to memory
142	* by a physical CPU on #VMEXIT.
143	*/
144	PSVMVMCBCTRL pVmcbNstGstCtrl = &pCtx->hwvirt.svm.Vmcb.ctrl;
145	pVmcbNstGstCtrl->u16InterceptRdCRx = pVmcbNstGstCache->u16InterceptRdCRx;
146	pVmcbNstGstCtrl->u16InterceptWrCRx = pVmcbNstGstCache->u16InterceptWrCRx;
147	pVmcbNstGstCtrl->u16InterceptRdDRx = pVmcbNstGstCache->u16InterceptRdDRx;
148	pVmcbNstGstCtrl->u16InterceptWrDRx = pVmcbNstGstCache->u16InterceptWrDRx;
149	pVmcbNstGstCtrl->u16PauseFilterThreshold = pVmcbNstGstCache->u16PauseFilterThreshold;
150	pVmcbNstGstCtrl->u16PauseFilterCount = pVmcbNstGstCache->u16PauseFilterCount;
151	pVmcbNstGstCtrl->u32InterceptXcpt = pVmcbNstGstCache->u32InterceptXcpt;
152	pVmcbNstGstCtrl->u64InterceptCtrl = pVmcbNstGstCache->u64InterceptCtrl;
153	pVmcbNstGstCtrl->u64TSCOffset = pVmcbNstGstCache->u64TSCOffset;
154	pVmcbNstGstCtrl->IntCtrl.n.u1VIntrMasking = pVmcbNstGstCache->fVIntrMasking;
155	pVmcbNstGstCtrl->NestedPagingCtrl.n.u1NestedPaging = pVmcbNstGstCache->fNestedPaging;
156	pVmcbNstGstCtrl->LbrVirt.n.u1LbrVirt = pVmcbNstGstCache->fLbrVirt;
157	pVmcbNstGstCache->fCacheValid = false;
158	}
159
160	/*
161	* Transitions to ring-3 flag a full CPU-state change except if we transition to ring-3
162	* in response to a physical CPU interrupt as no changes to the guest-CPU state are
163	* expected (see VINF_EM_RAW_INTERRUPT handling in hmR0SvmExitToRing3).
164	*
165	* However, with nested-guests, the state -can- change on trips to ring-3 for we might
166	* try to inject a nested-guest physical interrupt and cause a SVM_EXIT_INTR #VMEXIT for
167	* the nested-guest from ring-3. Import the complete state here as we will be swapping
168	* to the guest VMCB after the #VMEXIT.
169	*/
170	CPUMImportGuestStateOnDemand(pVCpu, CPUMCTX_EXTRN_ALL);
171	CPUM_ASSERT_NOT_EXTRN(pVCpu, CPUMCTX_EXTRN_ALL);
172	ASMAtomicUoOrU64(&pVCpu->hm.s.fCtxChanged, HM_CHANGED_ALL_GUEST);
173	}
174	#endif
175
176	/**
177	* Checks if the Virtual GIF (Global Interrupt Flag) feature is supported and
178	* enabled for the VM.
179	*
180	* @returns @c true if VGIF is enabled, @c false otherwise.
181	* @param pVM The cross context VM structure.
182	*
183	* @remarks This value returned by this functions is expected by the callers not
184	* to change throughout the lifetime of the VM.
185	*/
186	VMM_INT_DECL(bool) HMIsSvmVGifActive(PCVMCC pVM)
187	{
188	#ifdef IN_RING0
189	bool const fVGif = RT_BOOL(g_fHmSvmFeatures & X86_CPUID_SVM_FEATURE_EDX_VGIF);
190	#else
191	bool const fVGif = RT_BOOL(pVM->hm.s.ForR3.svm.fFeatures & X86_CPUID_SVM_FEATURE_EDX_VGIF);
192	#endif
193	return fVGif && pVM->hm.s.svm.fVGif;
194	}
195
196
197	/**
198	* Interface used by IEM to handle patched TPR accesses.
199	*
200	* @returns VBox status code
201	* @retval VINF_SUCCESS if hypercall was handled, RIP + RFLAGS all dealt with.
202	* @retval VERR_NOT_FOUND if hypercall was _not_ handled.
203	* @retval VERR_SVM_UNEXPECTED_PATCH_TYPE on IPE.
204	*
205	* @param pVM The cross context VM structure.
206	* @param pVCpu The cross context virtual CPU structure.
207	*/
208	VMM_INT_DECL(int) HMHCMaybeMovTprSvmHypercall(PVMCC pVM, PVMCPUCC pVCpu)
209	{
210	if (pVM->hm.s.fTprPatchingAllowed)
211	{
212	int rc = hmEmulateSvmMovTpr(pVM, pVCpu);
213	if (RT_SUCCESS(rc))
214	return VINF_SUCCESS;
215	return rc;
216	}
217	return VERR_NOT_FOUND;
218	}
219
220
221	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
222	/**
223	* Checks if the current AMD CPU is subject to erratum 170 "In SVM mode,
224	* incorrect code bytes may be fetched after a world-switch".
225	*
226	* @param pu32Family Where to store the CPU family (can be NULL).
227	* @param pu32Model Where to store the CPU model (can be NULL).
228	* @param pu32Stepping Where to store the CPU stepping (can be NULL).
229	* @returns true if the erratum applies, false otherwise.
230	*/
231	VMM_INT_DECL(int) HMIsSubjectToSvmErratum170(uint32_t pu32Family, uint32_t pu32Model, uint32_t *pu32Stepping)
232	{
233	/*
234	* Erratum 170 which requires a forced TLB flush for each world switch:
235	* See AMD spec. "Revision Guide for AMD NPT Family 0Fh Processors".
236	*
237	* All BH-G1/2 and DH-G1/2 models include a fix:
238	* Athlon X2: 0x6b 1/2
239	* 0x68 1/2
240	* Athlon 64: 0x7f 1
241	* 0x6f 2
242	* Sempron: 0x7f 1/2
243	* 0x6f 2
244	* 0x6c 2
245	* 0x7c 2
246	* Turion 64: 0x68 2
247	*/
248	uint32_t u32Dummy;
249	uint32_t u32Version, u32Family, u32Model, u32Stepping, u32BaseFamily;
250	ASMCpuId(1, &u32Version, &u32Dummy, &u32Dummy, &u32Dummy);
251	u32BaseFamily = (u32Version >> 8) & 0xf;
252	u32Family = u32BaseFamily + (u32BaseFamily == 0xf ? ((u32Version >> 20) & 0x7f) : 0);
253	u32Model = ((u32Version >> 4) & 0xf);
254	u32Model = u32Model \| ((u32BaseFamily == 0xf ? (u32Version >> 16) & 0x0f : 0) << 4);
255	u32Stepping = u32Version & 0xf;
256
257	bool fErratumApplies = false;
258	if ( u32Family == 0xf
259	&& !((u32Model == 0x68 \|\| u32Model == 0x6b \|\| u32Model == 0x7f) && u32Stepping >= 1)
260	&& !((u32Model == 0x6f \|\| u32Model == 0x6c \|\| u32Model == 0x7c) && u32Stepping >= 2))
261	fErratumApplies = true;
262
263	if (pu32Family)
264	*pu32Family = u32Family;
265	if (pu32Model)
266	*pu32Model = u32Model;
267	if (pu32Stepping)
268	*pu32Stepping = u32Stepping;
269
270	return fErratumApplies;
271	}
272	#endif
273
274
275	/**
276	* Converts an SVM event type to a TRPM event type.
277	*
278	* @returns The TRPM event type.
279	* @retval TRPM_32BIT_HACK if the specified type of event isn't among the set
280	* of recognized trap types.
281	*
282	* @param pEvent Pointer to the SVM event.
283	* @param uVector The vector associated with the event.
284	*/
285	VMM_INT_DECL(TRPMEVENT) HMSvmEventToTrpmEventType(PCSVMEVENT pEvent, uint8_t uVector)
286	{
287	uint8_t const uType = pEvent->n.u3Type;
288	switch (uType)
289	{
290	case SVM_EVENT_EXTERNAL_IRQ: return TRPM_HARDWARE_INT;
291	case SVM_EVENT_SOFTWARE_INT: return TRPM_SOFTWARE_INT;
292	case SVM_EVENT_NMI: return TRPM_TRAP;
293	case SVM_EVENT_EXCEPTION:
294	{
295	if ( uVector == X86_XCPT_BP
296	\|\| uVector == X86_XCPT_OF)
297	return TRPM_SOFTWARE_INT;
298	return TRPM_TRAP;
299	}
300	default:
301	break;
302	}
303	AssertMsgFailed(("HMSvmEventToTrpmEvent: Invalid pending-event type %#x\n", uType));
304	return TRPM_32BIT_HACK;
305	}
306
307
308	/**
309	* Gets the SVM nested-guest control intercepts if cached by HM.
310	*
311	* @returns @c true on success, @c false otherwise.
312	* @param pVCpu The cross context virtual CPU structure of the calling
313	* EMT.
314	* @param pu64Intercepts Where to store the control intercepts. Only updated when
315	* @c true is returned.
316	*/
317	VMM_INT_DECL(bool) HMGetGuestSvmCtrlIntercepts(PCVMCPU pVCpu, uint64_t *pu64Intercepts)
318	{
319	Assert(pu64Intercepts);
320	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
321	if (pVmcbNstGstCache->fCacheValid)
322	{
323	*pu64Intercepts = pVmcbNstGstCache->u64InterceptCtrl;
324	return true;
325	}
326	return false;
327	}
328
329
330	/**
331	* Gets the SVM nested-guest CRx-read intercepts if cached by HM.
332	*
333	* @returns @c true on success, @c false otherwise.
334	* @param pVCpu The cross context virtual CPU structure of the calling
335	* EMT.
336	* @param pu16Intercepts Where to store the CRx-read intercepts. Only updated
337	* when @c true is returned.
338	*/
339	VMM_INT_DECL(bool) HMGetGuestSvmReadCRxIntercepts(PCVMCPU pVCpu, uint16_t *pu16Intercepts)
340	{
341	Assert(pu16Intercepts);
342	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
343	if (pVmcbNstGstCache->fCacheValid)
344	{
345	*pu16Intercepts = pVmcbNstGstCache->u16InterceptRdCRx;
346	return true;
347	}
348	return false;
349	}
350
351
352	/**
353	* Gets the SVM nested-guest CRx-write intercepts if cached by HM.
354	*
355	* @returns @c true on success, @c false otherwise.
356	* @param pVCpu The cross context virtual CPU structure of the calling
357	* EMT.
358	* @param pu16Intercepts Where to store the CRx-write intercepts. Only updated
359	* when @c true is returned.
360	*/
361	VMM_INT_DECL(bool) HMGetGuestSvmWriteCRxIntercepts(PCVMCPU pVCpu, uint16_t *pu16Intercepts)
362	{
363	Assert(pu16Intercepts);
364	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
365	if (pVmcbNstGstCache->fCacheValid)
366	{
367	*pu16Intercepts = pVmcbNstGstCache->u16InterceptWrCRx;
368	return true;
369	}
370	return false;
371	}
372
373
374	/**
375	* Gets the SVM nested-guest DRx-read intercepts if cached by HM.
376	*
377	* @returns @c true on success, @c false otherwise.
378	* @param pVCpu The cross context virtual CPU structure of the calling
379	* EMT.
380	* @param pu16Intercepts Where to store the DRx-read intercepts. Only updated
381	* when @c true is returned.
382	*/
383	VMM_INT_DECL(bool) HMGetGuestSvmReadDRxIntercepts(PCVMCPU pVCpu, uint16_t *pu16Intercepts)
384	{
385	Assert(pu16Intercepts);
386	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
387	if (pVmcbNstGstCache->fCacheValid)
388	{
389	*pu16Intercepts = pVmcbNstGstCache->u16InterceptRdDRx;
390	return true;
391	}
392	return false;
393	}
394
395
396	/**
397	* Gets the SVM nested-guest DRx-write intercepts if cached by HM.
398	*
399	* @returns @c true on success, @c false otherwise.
400	* @param pVCpu The cross context virtual CPU structure of the calling
401	* EMT.
402	* @param pu16Intercepts Where to store the DRx-write intercepts. Only updated
403	* when @c true is returned.
404	*/
405	VMM_INT_DECL(bool) HMGetGuestSvmWriteDRxIntercepts(PCVMCPU pVCpu, uint16_t *pu16Intercepts)
406	{
407	Assert(pu16Intercepts);
408	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
409	if (pVmcbNstGstCache->fCacheValid)
410	{
411	*pu16Intercepts = pVmcbNstGstCache->u16InterceptWrDRx;
412	return true;
413	}
414	return false;
415	}
416
417
418	/**
419	* Gets the SVM nested-guest exception intercepts if cached by HM.
420	*
421	* @returns @c true on success, @c false otherwise.
422	* @param pVCpu The cross context virtual CPU structure of the calling
423	* EMT.
424	* @param pu32Intercepts Where to store the exception intercepts. Only updated
425	* when @c true is returned.
426	*/
427	VMM_INT_DECL(bool) HMGetGuestSvmXcptIntercepts(PCVMCPU pVCpu, uint32_t *pu32Intercepts)
428	{
429	Assert(pu32Intercepts);
430	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
431	if (pVmcbNstGstCache->fCacheValid)
432	{
433	*pu32Intercepts = pVmcbNstGstCache->u32InterceptXcpt;
434	return true;
435	}
436	return false;
437	}
438
439
440	/**
441	* Checks if the nested-guest VMCB has virtual-interrupts masking enabled.
442	*
443	* @returns @c true on success, @c false otherwise.
444	* @param pVCpu The cross context virtual CPU structure of the calling
445	* EMT.
446	* @param pfVIntrMasking Where to store the virtual-interrupt masking bit.
447	* Updated only when @c true is returned.
448	*/
449	VMM_INT_DECL(bool) HMGetGuestSvmVirtIntrMasking(PCVMCPU pVCpu, bool *pfVIntrMasking)
450	{
451	Assert(pfVIntrMasking);
452	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
453	if (pVmcbNstGstCache->fCacheValid)
454	{
455	*pfVIntrMasking = pVmcbNstGstCache->fVIntrMasking;
456	return true;
457	}
458	return false;
459	}
460
461
462	/**
463	* Gets the SVM nested-guest nested-paging bit if cached by HM.
464	*
465	* @returns @c true on success, @c false otherwise.
466	* @param pVCpu The cross context virtual CPU structure of the
467	* calling EMT.
468	* @param pfNestedPaging Where to store the nested-paging bit. Updated only
469	* when @c true is returned.
470	*/
471	VMM_INT_DECL(bool) HMGetGuestSvmNestedPaging(PCVMCPU pVCpu, bool *pfNestedPaging)
472	{
473	Assert(pfNestedPaging);
474	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
475	if (pVmcbNstGstCache->fCacheValid)
476	{
477	*pfNestedPaging = pVmcbNstGstCache->fNestedPaging;
478	return true;
479	}
480	return false;
481	}
482
483
484	/**
485	* Returns the nested-guest VMCB pause-filter count.
486	*
487	* @returns @c true on success, @c false otherwise.
488	* @param pVCpu The cross context virtual CPU structure of the
489	* calling EMT.
490	* @param pu16PauseFilterCount Where to store the pause-filter count. Only
491	* updated @c true is returned.
492	*/
493	VMM_INT_DECL(bool) HMGetGuestSvmPauseFilterCount(PCVMCPU pVCpu, uint16_t *pu16PauseFilterCount)
494	{
495	Assert(pu16PauseFilterCount);
496	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
497	if (pVmcbNstGstCache->fCacheValid)
498	{
499	*pu16PauseFilterCount = pVmcbNstGstCache->u16PauseFilterCount;
500	return true;
501	}
502	return false;
503	}
504
505
506	/**
507	* Returns the SVM nested-guest TSC offset if cached by HM.
508	*
509	* @returns The TSC offset after applying any nested-guest TSC offset.
510	* @param pVCpu The cross context virtual CPU structure of the calling
511	* EMT.
512	* @param pu64TscOffset Where to store the TSC offset. Only updated when @c
513	* true is returned.
514	*/
515	VMM_INT_DECL(bool) HMGetGuestSvmTscOffset(PCVMCPU pVCpu, uint64_t *pu64TscOffset)
516	{
517	Assert(pu64TscOffset);
518	PCSVMNESTEDVMCBCACHE pVmcbNstGstCache = &pVCpu->hm.s.svm.NstGstVmcbCache;
519	if (pVmcbNstGstCache->fCacheValid)
520	{
521	*pu64TscOffset = pVmcbNstGstCache->u64TSCOffset;
522	return true;
523	}
524	return false;
525	}
526

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source: vbox/trunk/src/VBox/VMM/VMMAll/HMSVMAll.cpp@ 95085

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