SELMGC.cpp@ 13813

Last change on this file since 13813 was 13577, checked in by vboxsync, 16 years ago
#1865: SELM.
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1	/* $Id: SELMGC.cpp 13577 2008-10-27 13:53:04Z vboxsync $ */
2	/** @file
3	* SELM - The Selector Manager, Guest Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	/*******************************************************************************
23	* Header Files *
24	*******************************************************************************/
25	#define LOG_GROUP LOG_GROUP_SELM
26	#include <VBox/selm.h>
27	#include <VBox/mm.h>
28	#include <VBox/em.h>
29	#include <VBox/trpm.h>
30	#include "SELMInternal.h"
31	#include <VBox/vm.h>
32	#include <VBox/pgm.h>
33
34	#include <VBox/param.h>
35	#include <VBox/err.h>
36	#include <VBox/log.h>
37	#include <iprt/assert.h>
38	#include <iprt/asm.h>
39
40
41	/**
42	* Synchronizes one GDT entry (guest -> shadow).
43	*
44	* @returns VBox status code (appropriate for trap handling and GC return).
45	* @param pVM VM Handle.
46	* @param pRegFrame Trap register frame.
47	* @param iGDTEntry The GDT entry to sync.
48	*/
49	static int selmGCSyncGDTEntry(PVM pVM, PCPUMCTXCORE pRegFrame, unsigned iGDTEntry)
50	{
51	Log2(("GDT %04X LDTR=%04X\n", iGDTEntry, CPUMGetGuestLDTR(pVM)));
52
53	/*
54	* Validate the offset.
55	*/
56	VBOXGDTR GdtrGuest;
57	CPUMGetGuestGDTR(pVM, &GdtrGuest);
58	unsigned offEntry = iGDTEntry * sizeof(X86DESC);
59	if ( iGDTEntry >= SELM_GDT_ELEMENTS
60	\|\| offEntry > GdtrGuest.cbGdt)
61	return VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
62
63	/*
64	* Read the guest descriptor.
65	*/
66	X86DESC Desc;
67	int rc = MMGCRamRead(pVM, &Desc, (uint8_t *)GdtrGuest.pGdt + offEntry, sizeof(X86DESC));
68	if (VBOX_FAILURE(rc))
69	return VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
70
71	/*
72	* Check for conflicts.
73	*/
74	RTSEL Sel = iGDTEntry << X86_SEL_SHIFT;
75	Assert( !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] & ~X86_SEL_MASK)
76	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] & ~X86_SEL_MASK)
77	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] & ~X86_SEL_MASK)
78	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] & ~X86_SEL_MASK)
79	&& !(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] & ~X86_SEL_MASK));
80	if ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == Sel
81	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == Sel
82	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == Sel
83	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == Sel
84	\|\| pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == Sel)
85	{
86	if (Desc.Gen.u1Present)
87	{
88	Log(("selmGCSyncGDTEntry: Sel=%d Desc=%.8Vhxs: detected conflict!!\n", Sel, &Desc));
89	return VINF_SELM_SYNC_GDT;
90	}
91	Log(("selmGCSyncGDTEntry: Sel=%d Desc=%.8Vhxs: potential conflict (still not present)!\n", Sel, &Desc));
92
93	/* Note: we can't continue below or else we'll change the shadow descriptor!! */
94	/* When the guest makes the selector present, then we'll do a GDT sync. */
95	return VINF_SUCCESS;
96	}
97
98	/*
99	* Code and data selectors are generally 1:1, with the
100	* 'little' adjustment we do for DPL 0 selectors.
101	*/
102	PX86DESC pShadowDescr = &pVM->selm.s.paGdtRC[iGDTEntry];
103	if (Desc.Gen.u1DescType)
104	{
105	/*
106	* Hack for A-bit against Trap E on read-only GDT.
107	*/
108	/** @todo Fix this by loading ds and cs before turning off WP. */
109	Desc.Gen.u4Type \|= X86_SEL_TYPE_ACCESSED;
110
111	/*
112	* All DPL 0 code and data segments are squeezed into DPL 1.
113	*
114	* We're skipping conforming segments here because those
115	* cannot give us any trouble.
116	*/
117	if ( Desc.Gen.u2Dpl == 0
118	&& (Desc.Gen.u4Type & (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF))
119	!= (X86_SEL_TYPE_CODE \| X86_SEL_TYPE_CONF) )
120	Desc.Gen.u2Dpl = 1;
121	}
122	else
123	{
124	/*
125	* System type selectors are marked not present.
126	* Recompiler or special handling is required for these.
127	*/
128	/** @todo what about interrupt gates and rawr0? */
129	Desc.Gen.u1Present = 0;
130	}
131	//Log(("O: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(pShadowDescr)), X86DESC_LIMIT(pShadowDescr), (pShadowDescr->au32[1] >> 8) & 0xFFFF ));
132	//Log(("N: base=%08X limit=%08X attr=%04X\n", X86DESC_BASE(Desc)), X86DESC_LIMIT(Desc), (Desc.au32[1] >> 8) & 0xFFFF ));
133	*pShadowDescr = Desc;
134
135	/* Check if we change the LDT selector */
136	if (Sel == CPUMGetGuestLDTR(pVM))
137	{
138	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
139	return VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT;
140	}
141
142	/* Or the TR selector */
143	if (Sel == CPUMGetGuestTR(pVM))
144	{
145	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
146	return VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT;
147	}
148
149	#ifdef VBOX_STRICT
150	if (Sel == (pRegFrame->cs & X86_SEL_MASK))
151	Log(("GDT write to selector in CS register %04X\n", pRegFrame->cs));
152	else if (Sel == (pRegFrame->ds & X86_SEL_MASK))
153	Log(("GDT write to selector in DS register %04X\n", pRegFrame->ds));
154	else if (Sel == (pRegFrame->es & X86_SEL_MASK))
155	Log(("GDT write to selector in ES register %04X\n", pRegFrame->es));
156	else if (Sel == (pRegFrame->fs & X86_SEL_MASK))
157	Log(("GDT write to selector in FS register %04X\n", pRegFrame->fs));
158	else if (Sel == (pRegFrame->gs & X86_SEL_MASK))
159	Log(("GDT write to selector in GS register %04X\n", pRegFrame->gs));
160	else if (Sel == (pRegFrame->ss & X86_SEL_MASK))
161	Log(("GDT write to selector in SS register %04X\n", pRegFrame->ss));
162	#endif
163	return VINF_SUCCESS;
164	}
165
166
167	/**
168	* \#PF Virtual Handler callback for Guest write access to the Guest's own GDT.
169	*
170	* @returns VBox status code (appropriate for trap handling and GC return).
171	* @param pVM VM Handle.
172	* @param uErrorCode CPU Error code.
173	* @param pRegFrame Trap register frame.
174	* @param pvFault The fault address (cr2).
175	* @param pvRange The base address of the handled virtual range.
176	* @param offRange The offset of the access into this range.
177	* (If it's a EIP range this's the EIP, if not it's pvFault.)
178	*/
179	VMMRCDECL(int) selmRCGuestGDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
180	{
181	LogFlow(("selmRCGuestGDTWriteHandler errcode=%x fault=%VGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
182
183	/*
184	* First check if this is the LDT entry.
185	* LDT updates are problemous since an invalid LDT entry will cause trouble during worldswitch.
186	*/
187	int rc;
188	if (CPUMGetGuestLDTR(pVM) / sizeof(X86DESC) == offRange / sizeof(X86DESC))
189	{
190	Log(("LDTR selector change -> fall back to HC!!\n"));
191	rc = VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
192	/** @todo We're not handling changed to the selectors in LDTR and TR correctly at all.
193	* We should ignore any changes to those and sync them only when they are loaded by the guest! */
194	}
195	else
196	{
197	/*
198	* Attempt to emulate the instruction and sync the affected entries.
199	*/
200	/** @todo should check if any affected selectors are loaded. */
201	uint32_t cb;
202	rc = EMInterpretInstruction(pVM, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
203	if (VBOX_SUCCESS(rc) && cb)
204	{
205	unsigned iGDTE1 = offRange / sizeof(X86DESC);
206	int rc2 = selmGCSyncGDTEntry(pVM, pRegFrame, iGDTE1);
207	if (rc2 == VINF_SUCCESS)
208	{
209	Assert(cb);
210	unsigned iGDTE2 = (offRange + cb - 1) / sizeof(X86DESC);
211	if (iGDTE1 != iGDTE2)
212	rc2 = selmGCSyncGDTEntry(pVM, pRegFrame, iGDTE2);
213	if (rc2 == VINF_SUCCESS)
214	{
215	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTHandled);
216	return rc;
217	}
218	}
219	if (rc == VINF_SUCCESS \|\| VBOX_FAILURE(rc2))
220	rc = rc2;
221	}
222	else
223	{
224	Assert(VBOX_FAILURE(rc));
225	if (rc == VERR_EM_INTERPRETER)
226	rc = VINF_EM_RAW_EMULATE_INSTR_GDT_FAULT;
227	}
228	}
229	if ( rc != VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT
230	&& rc != VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT)
231	{
232	/* Not necessary when we need to go back to the host context to sync the LDT or TSS. */
233	VM_FF_SET(pVM, VM_FF_SELM_SYNC_GDT);
234	}
235	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestGDTUnhandled);
236	return rc;
237	}
238
239
240	/**
241	* \#PF Virtual Handler callback for Guest write access to the Guest's own LDT.
242	*
243	* @returns VBox status code (appropriate for trap handling and GC return).
244	* @param pVM VM Handle.
245	* @param uErrorCode CPU Error code.
246	* @param pRegFrame Trap register frame.
247	* @param pvFault The fault address (cr2).
248	* @param pvRange The base address of the handled virtual range.
249	* @param offRange The offset of the access into this range.
250	* (If it's a EIP range this's the EIP, if not it's pvFault.)
251	*/
252	VMMRCDECL(int) selmRCGuestLDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
253	{
254	/** @todo To be implemented. */
255	////LogCom(("selmRCGuestLDTWriteHandler: eip=%08X pvFault=%VGv pvRange=%VGv\r\n", pRegFrame->eip, pvFault, pvRange));
256
257	VM_FF_SET(pVM, VM_FF_SELM_SYNC_LDT);
258	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestLDT);
259	return VINF_EM_RAW_EMULATE_INSTR_LDT_FAULT;
260	}
261
262
263	/**
264	* \#PF Virtual Handler callback for Guest write access to the Guest's own current TSS.
265	*
266	* @returns VBox status code (appropriate for trap handling and GC return).
267	* @param pVM VM Handle.
268	* @param uErrorCode CPU Error code.
269	* @param pRegFrame Trap register frame.
270	* @param pvFault The fault address (cr2).
271	* @param pvRange The base address of the handled virtual range.
272	* @param offRange The offset of the access into this range.
273	* (If it's a EIP range this's the EIP, if not it's pvFault.)
274	*/
275	VMMRCDECL(int) selmRCGuestTSSWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
276	{
277	LogFlow(("selmRCGuestTSSWriteHandler errcode=%x fault=%VGv offRange=%08x\n", (uint32_t)uErrorCode, pvFault, offRange));
278
279	/*
280	* Try emulate the access and compare the R0 ss:esp with the shadow tss values.
281	*
282	* Note, that it's safe to access the TSS after a successfull instruction emulation,
283	* even if the stuff that was changed wasn't the ss0 or esp0 bits. The CPU insists
284	* on the TSS being all one physical page, so ASSUMING that we're not trapping
285	* I/O map accesses this is safe.
286	*/
287	uint32_t cb;
288	int rc = EMInterpretInstruction(pVM, pRegFrame, (RTGCPTR)(RTRCUINTPTR)pvFault, &cb);
289	if (VBOX_SUCCESS(rc) && cb)
290	{
291	PCVBOXTSS pGuestTSS = (PVBOXTSS)pVM->selm.s.GCPtrGuestTss;
292	if ( pGuestTSS->esp0 != pVM->selm.s.Tss.esp1
293	\|\| pGuestTSS->ss0 != (pVM->selm.s.Tss.ss1 & ~1)) /* undo raw-r0 */
294	{
295	Log(("selmRCGuestTSSWriteHandler: R0 stack: %RTsel:%VGv -> %RTsel:%VGv\n",
296	(RTSEL)(pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1, (RTSEL)pGuestTSS->ss0, pGuestTSS->esp0));
297	pVM->selm.s.Tss.esp1 = pGuestTSS->esp0;
298	pVM->selm.s.Tss.ss1 = pGuestTSS->ss0 \| 1;
299	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandledChanged);
300	}
301	if (CPUMGetGuestCR4(pVM) & X86_CR4_VME)
302	{
303	uint32_t offIntRedirBitmap = pGuestTSS->offIoBitmap - sizeof(pVM->selm.s.Tss.IntRedirBitmap);
304
305	/** @todo not sure how the partial case is handled; probably not allowed */
306	if ( offIntRedirBitmap <= offRange
307	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) >= offRange + cb
308	&& offIntRedirBitmap + sizeof(pVM->selm.s.Tss.IntRedirBitmap) <= pVM->selm.s.cbGuestTss)
309	{
310	Log(("offIoBitmap=%x offIntRedirBitmap=%x cbTSS=%x\n", pGuestTSS->offIoBitmap, offIntRedirBitmap, pVM->selm.s.cbGuestTss));
311	/** @todo only update the changed part. */
312	for (uint32_t i = 0; i < sizeof(pVM->selm.s.Tss.IntRedirBitmap) / 8;i++)
313	{
314	rc = MMGCRamRead(pVM, &pVM->selm.s.Tss.IntRedirBitmap[i * 8], (uint8_t )pGuestTSS + offIntRedirBitmap + i 8, 8);
315	if (VBOX_FAILURE(rc))
316	{
317	/* Shadow page table might be out of sync */
318	rc = PGMPrefetchPage(pVM, (RTGCPTR)(RTRCUINTPTR)((uint8_t )pGuestTSS + offIntRedirBitmap + i8));
319	if (VBOX_FAILURE(rc))
320	{
321	AssertMsg(rc == VINF_SUCCESS, ("PGMPrefetchPage %VGv failed with %Vrc\n", (uint8_t )pGuestTSS + offIntRedirBitmap + i8, rc));
322	break;
323	}
324	rc = MMGCRamRead(pVM, &pVM->selm.s.Tss.IntRedirBitmap[i * 8], (uint8_t )pGuestTSS + offIntRedirBitmap + i 8, 8);
325	}
326	AssertMsg(rc == VINF_SUCCESS, ("MMGCRamRead %VGv failed with %Vrc\n", (uint8_t )pGuestTSS + offIntRedirBitmap + i 8, rc));
327	}
328	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSRedir);
329	}
330	}
331	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSHandled);
332	}
333	else
334	{
335	Assert(VBOX_FAILURE(rc));
336	VM_FF_SET(pVM, VM_FF_SELM_SYNC_TSS);
337	STAM_COUNTER_INC(&pVM->selm.s.StatRCWriteGuestTSSUnhandled);
338	if (rc == VERR_EM_INTERPRETER)
339	rc = VINF_EM_RAW_EMULATE_INSTR_TSS_FAULT;
340	}
341	return rc;
342	}
343
344
345	/**
346	* \#PF Virtual Handler callback for Guest write access to the VBox shadow GDT.
347	*
348	* @returns VBox status code (appropriate for trap handling and GC return).
349	* @param pVM VM Handle.
350	* @param uErrorCode CPU Error code.
351	* @param pRegFrame Trap register frame.
352	* @param pvFault The fault address (cr2).
353	* @param pvRange The base address of the handled virtual range.
354	* @param offRange The offset of the access into this range.
355	* (If it's a EIP range this's the EIP, if not it's pvFault.)
356	*/
357	VMMRCDECL(int) selmRCShadowGDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
358	{
359	LogRel(("FATAL ERROR: selmRCShadowGDTWriteHandler: eip=%08X pvFault=%VGv pvRange=%VGv\r\n", pRegFrame->eip, pvFault, pvRange));
360	return VERR_SELM_SHADOW_GDT_WRITE;
361	}
362
363
364	/**
365	* \#PF Virtual Handler callback for Guest write access to the VBox shadow LDT.
366	*
367	* @returns VBox status code (appropriate for trap handling and GC return).
368	* @param pVM VM Handle.
369	* @param uErrorCode CPU Error code.
370	* @param pRegFrame Trap register frame.
371	* @param pvFault The fault address (cr2).
372	* @param pvRange The base address of the handled virtual range.
373	* @param offRange The offset of the access into this range.
374	* (If it's a EIP range this's the EIP, if not it's pvFault.)
375	*/
376	VMMRCDECL(int) selmRCShadowLDTWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
377	{
378	LogRel(("FATAL ERROR: selmRCShadowLDTWriteHandler: eip=%08X pvFault=%VGv pvRange=%VGv\r\n", pRegFrame->eip, pvFault, pvRange));
379	Assert((RTRCPTR)pvFault >= pVM->selm.s.pvLdtRC && (RTRCUINTPTR)pvFault < (RTRCUINTPTR)pVM->selm.s.pvLdtRC + 65536 + PAGE_SIZE);
380	return VERR_SELM_SHADOW_LDT_WRITE;
381	}
382
383
384	/**
385	* \#PF Virtual Handler callback for Guest write access to the VBox shadow TSS.
386	*
387	* @returns VBox status code (appropriate for trap handling and GC return).
388	* @param pVM VM Handle.
389	* @param uErrorCode CPU Error code.
390	* @param pRegFrame Trap register frame.
391	* @param pvFault The fault address (cr2).
392	* @param pvRange The base address of the handled virtual range.
393	* @param offRange The offset of the access into this range.
394	* (If it's a EIP range this's the EIP, if not it's pvFault.)
395	*/
396	VMMRCDECL(int) selmRCShadowTSSWriteHandler(PVM pVM, RTGCUINT uErrorCode, PCPUMCTXCORE pRegFrame, RTGCPTR pvFault, RTGCPTR pvRange, uintptr_t offRange)
397	{
398	LogRel(("FATAL ERROR: selmRCShadowTSSWriteHandler: eip=%08X pvFault=%VGv pvRange=%VGv\r\n", pRegFrame->eip, pvFault, pvRange));
399	return VERR_SELM_SHADOW_TSS_WRITE;
400	}
401
402
403	/**
404	* Gets ss:esp for ring1 in main Hypervisor's TSS.
405	*
406	* @returns VBox status code.
407	* @param pVM VM Handle.
408	* @param pSS Ring1 SS register value.
409	* @param pEsp Ring1 ESP register value.
410	*/
411	VMMRCDECL(int) SELMGCGetRing1Stack(PVM pVM, uint32_t pSS, uint32_t pEsp)
412	{
413	if (pVM->selm.s.fSyncTSSRing0Stack)
414	{
415	uint8_t * GCPtrGuestTss = (uint8_t *)(uintptr_t)pVM->selm.s.GCPtrGuestTss;
416	bool fTriedAlready = false;
417	int rc;
418	VBOXTSS tss;
419
420	Assert(pVM->selm.s.GCPtrGuestTss && pVM->selm.s.cbMonitoredGuestTss);
421
422	l_tryagain:
423	rc = MMGCRamRead(pVM, &tss.ss0, GCPtrGuestTss + RT_OFFSETOF(VBOXTSS, ss0), sizeof(tss.ss0));
424	rc \|= MMGCRamRead(pVM, &tss.esp0, GCPtrGuestTss + RT_OFFSETOF(VBOXTSS, esp0), sizeof(tss.esp0));
425	#ifdef DEBUG
426	rc \|= MMGCRamRead(pVM, &tss.offIoBitmap, GCPtrGuestTss + RT_OFFSETOF(VBOXTSS, offIoBitmap), sizeof(tss.offIoBitmap));
427	#endif
428
429	if (VBOX_FAILURE(rc))
430	{
431	if (!fTriedAlready)
432	{
433	/* Shadow page might be out of sync. Sync and try again */
434	/** @todo might cross page boundary */
435	fTriedAlready = true;
436	rc = PGMPrefetchPage(pVM, (RTGCPTR)(uintptr_t)GCPtrGuestTss);
437	if (rc != VINF_SUCCESS)
438	return rc;
439	goto l_tryagain;
440	}
441	AssertMsgFailed(("Unable to read TSS structure at %RRv\n", GCPtrGuestTss));
442	return rc;
443	}
444
445	#ifdef LOG_ENABLED
446	uint32_t ssr0 = pVM->selm.s.Tss.ss1;
447	uint32_t espr0 = pVM->selm.s.Tss.esp1;
448	ssr0 &= ~1;
449
450	if (ssr0 != tss.ss0 \|\| espr0 != tss.esp0)
451	Log(("SELMGetRing1Stack: Updating TSS ring 0 stack to %04X:%08X\n", tss.ss0, tss.esp0));
452
453	Log(("offIoBitmap=%#x\n", tss.offIoBitmap));
454	#endif
455	/* Update our TSS structure for the guest's ring 1 stack */
456	SELMSetRing1Stack(pVM, tss.ss0 \| 1, (RTGCPTR32)tss.esp0);
457	pVM->selm.s.fSyncTSSRing0Stack = false;
458	}
459
460	*pSS = pVM->selm.s.Tss.ss1;
461	*pEsp = pVM->selm.s.Tss.esp1;
462
463	return VINF_SUCCESS;
464	}

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source: vbox/trunk/src/VBox/VMM/VMMGC/SELMGC.cpp@ 13813

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