VMMRC.cpp@ 41801

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1	/* $Id: VMMRC.cpp 41801 2012-06-17 16:46:51Z vboxsync $ */
2	/** @file
3	* VMM - Raw-mode Context.
4	*/
5
6	/*
7	* Copyright (C) 2006-2010 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_VMM
23	#include <iprt/asm-amd64-x86.h> /* for SUPGetCpuHzFromGIP */
24	#include <VBox/vmm/vmm.h>
25	#include <VBox/vmm/trpm.h>
26	#include <VBox/vmm/pgm.h>
27	#include "VMMInternal.h"
28	#include <VBox/vmm/vm.h>
29	#include <VBox/sup.h>
30	#include <VBox/err.h>
31	#include <VBox/log.h>
32	#include <iprt/assert.h>
33	#include <iprt/initterm.h>
34
35
36	/*******************************************************************************
37	* Global Variables *
38	*******************************************************************************/
39	/** Default logger instance. */
40	extern "C" DECLIMPORT(RTLOGGERRC) g_Logger;
41	extern "C" DECLIMPORT(RTLOGGERRC) g_RelLogger;
42
43
44	/*******************************************************************************
45	* Internal Functions *
46	*******************************************************************************/
47	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg);
48	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame);
49	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame);
50
51
52
53	/**
54	* The GC entry point.
55	*
56	* @returns VBox status code.
57	* @param pVM Pointer to the VM.
58	* @param uOperation Which operation to execute (VMMGCOPERATION).
59	* @param uArg Argument to that operation.
60	*/
61	VMMRCDECL(int) VMMGCEntry(PVM pVM, unsigned uOperation, unsigned uArg, ...)
62	{
63	/* todo */
64	switch (uOperation)
65	{
66	/*
67	* Init RC modules.
68	*/
69	case VMMGC_DO_VMMGC_INIT:
70	{
71	/*
72	* Validate the svn revision (uArg).
73	*/
74	if (uArg != VMMGetSvnRev())
75	return VERR_VMM_RC_VERSION_MISMATCH;
76
77	/*
78	* Initialize the runtime.
79	* (The program timestamp is found in the elipsis.)
80	*/
81	va_list va;
82	va_start(va, uArg);
83	uint64_t u64TS = va_arg(va, uint64_t);
84	va_end(va);
85
86	int rc = RTRCInit(u64TS);
87	Log(("VMMGCEntry: VMMGC_DO_VMMGC_INIT - uArg=%u (svn revision) u64TS=%RX64; rc=%Rrc\n", uArg, u64TS, rc));
88	AssertRCReturn(rc, rc);
89
90	rc = PGMRegisterStringFormatTypes();
91	AssertRCReturn(rc, rc);
92
93	rc = PGMRCDynMapInit(pVM);
94	AssertRCReturn(rc, rc);
95	return VINF_SUCCESS;
96	}
97
98	/*
99	* Testcase which is used to test interrupt forwarding.
100	* It spins for a while with interrupts enabled.
101	*/
102	case VMMGC_DO_TESTCASE_HYPER_INTERRUPT:
103	{
104	uint32_t volatile i = 0;
105	ASMIntEnable();
106	while (i < _2G32)
107	i++;
108	ASMIntDisable();
109	return 0;
110	}
111
112	/*
113	* Testcase which simply returns, this is used for
114	* profiling of the switcher.
115	*/
116	case VMMGC_DO_TESTCASE_NOP:
117	return 0;
118
119	/*
120	* Testcase executes a privileged instruction to force a world switch. (in both SVM & VMX)
121	*/
122	case VMMGC_DO_TESTCASE_HWACCM_NOP:
123	ASMRdMsr_Low(MSR_IA32_SYSENTER_CS);
124	return 0;
125
126	/*
127	* Delay for ~100us.
128	*/
129	case VMMGC_DO_TESTCASE_INTERRUPT_MASKING:
130	{
131	uint64_t u64MaxTicks = (SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage) != ~(uint64_t)0
132	? SUPGetCpuHzFromGIP(g_pSUPGlobalInfoPage)
133	: _2G)
134	/ 10000;
135	uint64_t u64StartTSC = ASMReadTSC();
136	uint64_t u64TicksNow;
137	uint32_t volatile i = 0;
138
139	do
140	{
141	/* waste some time and protect against getting stuck. */
142	for (uint32_t volatile j = 0; j < 1000; j++, i++)
143	if (i > _2G32)
144	return VERR_GENERAL_FAILURE;
145
146	/* check if we're done.*/
147	u64TicksNow = ASMReadTSC() - u64StartTSC;
148	} while (u64TicksNow < u64MaxTicks);
149
150	return VINF_SUCCESS;
151	}
152
153	/*
154	* Trap testcases and unknown operations.
155	*/
156	default:
157	if ( uOperation >= VMMGC_DO_TESTCASE_TRAP_FIRST
158	&& uOperation < VMMGC_DO_TESTCASE_TRAP_LAST)
159	return vmmGCTest(pVM, uOperation, uArg);
160	return VERR_INVALID_PARAMETER;
161	}
162	}
163
164
165	/**
166	* Internal RC logger worker: Flush logger.
167	*
168	* @returns VINF_SUCCESS.
169	* @param pLogger The logger instance to flush.
170	* @remark This function must be exported!
171	*/
172	VMMRCDECL(int) vmmGCLoggerFlush(PRTLOGGERRC pLogger)
173	{
174	PVM pVM = &g_VM;
175	NOREF(pLogger);
176	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
177	return VINF_SUCCESS; /* fail quietly. */
178	return VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
179	}
180
181
182	/**
183	* Flush logger if almost full.
184	*
185	* @param pVM Pointer to the VM.
186	*/
187	VMMRCDECL(void) VMMGCLogFlushIfFull(PVM pVM)
188	{
189	if ( pVM->vmm.s.pRCLoggerRC
190	&& pVM->vmm.s.pRCLoggerRC->offScratch >= (sizeof(pVM->vmm.s.pRCLoggerRC->achScratch)*3/4))
191	{
192	if (pVM->vmm.s.fRCLoggerFlushingDisabled)
193	return; /* fail quietly. */
194	VMMRZCallRing3NoCpu(pVM, VMMCALLRING3_VMM_LOGGER_FLUSH, 0);
195	}
196	}
197
198
199	/**
200	* Switches from guest context to host context.
201	*
202	* @param pVM Pointer to the VM.
203	* @param rc The status code.
204	*/
205	VMMRCDECL(void) VMMGCGuestToHost(PVM pVM, int rc)
206	{
207	pVM->vmm.s.pfnGuestToHostRC(rc);
208	}
209
210
211	/**
212	* Calls the ring-0 host code.
213	*
214	* @param pVM Pointer to the VM.
215	*/
216	DECLASM(void) vmmRCProbeFireHelper(PVM pVM)
217	{
218	pVM->vmm.s.pfnGuestToHostRC(VINF_VMM_CALL_TRACER);
219	}
220
221
222
223	/**
224	* Execute the trap testcase.
225	*
226	* There is some common code here, that's why we're collecting them
227	* like this. Odd numbered variation (uArg) are executed with write
228	* protection (WP) enabled.
229	*
230	* @returns VINF_SUCCESS if it was a testcase setup up to continue and did so successfully.
231	* @returns VERR_NOT_IMPLEMENTED if the testcase wasn't implemented.
232	* @returns VERR_GENERAL_FAILURE if the testcase continued when it shouldn't.
233	*
234	* @param pVM Pointer to the VM.
235	* @param uOperation The testcase.
236	* @param uArg The variation. See function description for odd / even details.
237	*
238	* @remark Careful with the trap 08 testcase and WP, it will triple
239	* fault the box if the TSS, the Trap8 TSS and the fault TSS
240	* GDTE are in pages which are read-only.
241	* See bottom of SELMR3Init().
242	*/
243	static int vmmGCTest(PVM pVM, unsigned uOperation, unsigned uArg)
244	{
245	/*
246	* Set up the testcase.
247	*/
248	#if 0
249	switch (uOperation)
250	{
251	default:
252	break;
253	}
254	#endif
255
256	/*
257	* Enable WP if odd variation.
258	*/
259	if (uArg & 1)
260	vmmGCEnableWP();
261
262	/*
263	* Execute the testcase.
264	*/
265	int rc = VERR_NOT_IMPLEMENTED;
266	switch (uOperation)
267	{
268	//case VMMGC_DO_TESTCASE_TRAP_0:
269	//case VMMGC_DO_TESTCASE_TRAP_1:
270	//case VMMGC_DO_TESTCASE_TRAP_2:
271
272	case VMMGC_DO_TESTCASE_TRAP_3:
273	{
274	if (uArg <= 1)
275	rc = vmmGCTestTrap3();
276	break;
277	}
278
279	//case VMMGC_DO_TESTCASE_TRAP_4:
280	//case VMMGC_DO_TESTCASE_TRAP_5:
281	//case VMMGC_DO_TESTCASE_TRAP_6:
282	//case VMMGC_DO_TESTCASE_TRAP_7:
283
284	case VMMGC_DO_TESTCASE_TRAP_8:
285	{
286	#ifndef DEBUG_bird /** @todo dynamic check that this won't triple fault... */
287	if (uArg & 1)
288	break;
289	#endif
290	if (uArg <= 1)
291	rc = vmmGCTestTrap8();
292	break;
293	}
294
295	//VMMGC_DO_TESTCASE_TRAP_9,
296	//VMMGC_DO_TESTCASE_TRAP_0A,
297	//VMMGC_DO_TESTCASE_TRAP_0B,
298	//VMMGC_DO_TESTCASE_TRAP_0C,
299
300	case VMMGC_DO_TESTCASE_TRAP_0D:
301	{
302	if (uArg <= 1)
303	rc = vmmGCTestTrap0d();
304	break;
305	}
306
307	case VMMGC_DO_TESTCASE_TRAP_0E:
308	{
309	if (uArg <= 1)
310	rc = vmmGCTestTrap0e();
311	else if (uArg == 2 \|\| uArg == 4)
312	{
313	/*
314	* Test the use of a temporary #PF handler.
315	*/
316	rc = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, uArg != 4 ? vmmGCTestTmpPFHandler : vmmGCTestTmpPFHandlerCorruptFS);
317	if (RT_SUCCESS(rc))
318	{
319	rc = vmmGCTestTrap0e();
320
321	/* in case it didn't fire. */
322	int rc2 = TRPMGCSetTempHandler(pVM, X86_XCPT_PF, NULL);
323	if (RT_FAILURE(rc2) && RT_SUCCESS(rc))
324	rc = rc2;
325	}
326	}
327	break;
328	}
329	}
330
331	/*
332	* Re-enable WP.
333	*/
334	if (uArg & 1)
335	vmmGCDisableWP();
336
337	return rc;
338	}
339
340
341	/**
342	* Temporary \#PF trap handler for the \#PF test case.
343	*
344	* @returns VBox status code (appropriate for GC return).
345	* In this context RT_SUCCESS means to restart the instruction.
346	* @param pVM Pointer to the VM.
347	* @param pRegFrame Trap register frame.
348	*/
349	static DECLCALLBACK(int) vmmGCTestTmpPFHandler(PVM pVM, PCPUMCTXCORE pRegFrame)
350	{
351	if (pRegFrame->eip == (uintptr_t)vmmGCTestTrap0e_FaultEIP)
352	{
353	pRegFrame->eip = (uintptr_t)vmmGCTestTrap0e_ResumeEIP;
354	return VINF_SUCCESS;
355	}
356	NOREF(pVM);
357	return VERR_INTERNAL_ERROR;
358	}
359
360
361	/**
362	* Temporary \#PF trap handler for the \#PF test case, this one messes up the fs
363	* selector.
364	*
365	* @returns VBox status code (appropriate for GC return).
366	* In this context RT_SUCCESS means to restart the instruction.
367	* @param pVM Pointer to the VM.
368	* @param pRegFrame Trap register frame.
369	*/
370	static DECLCALLBACK(int) vmmGCTestTmpPFHandlerCorruptFS(PVM pVM, PCPUMCTXCORE pRegFrame)
371	{
372	int rc = vmmGCTestTmpPFHandler(pVM, pRegFrame);
373	pRegFrame->fs = 0x30;
374	return rc;
375	}
376

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source: vbox/trunk/src/VBox/VMM/VMMRC/VMMRC.cpp@ 41801

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