DrvTpmEmuTpms.cpp

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1	/* $Id: DrvTpmEmuTpms.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
2	/** @file
3	* TPM emulation driver based on libtpms.
4	*/
5
6	/*
7	* Copyright (C) 2021-2024 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* SPDX-License-Identifier: GPL-3.0-only
26	*/
27
28
29	/*********************************************************************************************************************************
30	* Header Files *
31	*********************************************************************************************************************************/
32	#define LOG_GROUP LOG_GROUP_DRV_TPM_EMU
33	#include <VBox/vmm/pdmdrv.h>
34	#include <VBox/vmm/pdmtpmifs.h>
35	#include <iprt/assert.h>
36	#include <iprt/file.h>
37	#include <iprt/mem.h>
38	#include <iprt/string.h>
39	#include <iprt/semaphore.h>
40	#include <iprt/uuid.h>
41	#include <iprt/vfs.h>
42	#include <iprt/zip.h>
43
44	#include <libtpms/tpm_library.h>
45	#include <libtpms/tpm_error.h>
46	#include <libtpms/tpm_tis.h>
47	#include <libtpms/tpm_nvfilename.h>
48
49	#include <iprt/formats/tpm.h>
50
51	#if 0
52	#include <unistd.h>
53	#endif
54	#include <stdlib.h>
55
56	#include "VBoxDD.h"
57
58
59	/*********************************************************************************************************************************
60	* Defined Constants And Macros *
61	*********************************************************************************************************************************/
62
63
64	/*********************************************************************************************************************************
65	* Structures and Typedefs *
66	*********************************************************************************************************************************/
67
68	/**
69	* TPM emulation driver instance data.
70	*
71	* @implements PDMITPMCONNECTOR
72	*/
73	typedef struct DRVTPMEMU
74	{
75	/** The stream interface. */
76	PDMITPMCONNECTOR ITpmConnector;
77	/** Pointer to the driver instance. */
78	PPDMDRVINS pDrvIns;
79	/** The VFS interface of the driver below for NVRAM/TPM state loading and storing. */
80	PPDMIVFSCONNECTOR pDrvVfs;
81
82	/** The TPM version we are emulating. */
83	TPMVERSION enmVersion;
84	/** The buffer size the TPM advertises. */
85	uint32_t cbBuffer;
86	/** Currently set locality. */
87	uint8_t bLoc;
88	} DRVTPMEMU;
89	/** Pointer to the TPM emulator instance data. */
90	typedef DRVTPMEMU *PDRVTPMEMU;
91
92	/** The special no current locality selected value. */
93	#define TPM_NO_LOCALITY_SELECTED 0xff
94
95
96	/*********************************************************************************************************************************
97	* Global Variables *
98	*********************************************************************************************************************************/
99	/** Pointer to the (only) instance data in this driver. */
100	static PDRVTPMEMU g_pDrvTpmEmuTpms = NULL;
101
102
103	/*********************************************************************************************************************************
104	* Internal Functions *
105	*********************************************************************************************************************************/
106
107	/* -=-=-=-=- PDMITPMCONNECTOR interface callabcks. -=-=-=-=- */
108
109
110	/** @interface_method_impl{PDMITPMCONNECTOR,pfnGetVersion} */
111	static DECLCALLBACK(TPMVERSION) drvTpmEmuTpmsGetVersion(PPDMITPMCONNECTOR pInterface)
112	{
113	PDRVTPMEMU pThis = RT_FROM_MEMBER(pInterface, DRVTPMEMU, ITpmConnector);
114	return pThis->enmVersion;
115	}
116
117
118	/** @interface_method_impl{PDMITPMCONNECTOR,pfnGetLocalityMax} */
119	static DECLCALLBACK(uint32_t) drvTpmEmuGetLocalityMax(PPDMITPMCONNECTOR pInterface)
120	{
121	RT_NOREF(pInterface);
122	return 4;
123	}
124
125
126	/** @interface_method_impl{PDMITPMCONNECTOR,pfnGetBufferSize} */
127	static DECLCALLBACK(uint32_t) drvTpmEmuGetBufferSize(PPDMITPMCONNECTOR pInterface)
128	{
129	PDRVTPMEMU pThis = RT_FROM_MEMBER(pInterface, DRVTPMEMU, ITpmConnector);
130	return pThis->cbBuffer;
131	}
132
133
134	/** @interface_method_impl{PDMITPMCONNECTOR,pfnGetEstablishedFlag} */
135	static DECLCALLBACK(bool) drvTpmEmuTpmsGetEstablishedFlag(PPDMITPMCONNECTOR pInterface)
136	{
137	RT_NOREF(pInterface);
138
139	TPM_BOOL fTpmEst = FALSE;
140	TPM_RESULT rcTpm = TPM_IO_TpmEstablished_Get(&fTpmEst);
141	if (RT_LIKELY(rcTpm == TPM_SUCCESS))
142	return RT_BOOL(fTpmEst);
143
144	return false;
145	}
146
147
148	/** @interface_method_impl{PDMITPMCONNECTOR,pfnResetEstablishedFlag} */
149	static DECLCALLBACK(int) drvTpmEmuTpmsResetEstablishedFlag(PPDMITPMCONNECTOR pInterface, uint8_t bLoc)
150	{
151	PDRVTPMEMU pThis = RT_FROM_MEMBER(pInterface, DRVTPMEMU, ITpmConnector);
152	uint8_t bLocOld = pThis->bLoc;
153
154	pThis->bLoc = bLoc;
155	TPM_RESULT rcTpm = TPM_IO_TpmEstablished_Reset();
156	pThis->bLoc = bLocOld;
157
158	if (RT_LIKELY(rcTpm == TPM_SUCCESS))
159	return VINF_SUCCESS;
160
161	LogRelMax(10, ("DrvTpmEmuTpms#%u: Failed to reset the established flag with %#x\n",
162	pThis->pDrvIns->iInstance, rcTpm));
163	return VERR_DEV_IO_ERROR;
164	}
165
166
167	/** @interface_method_impl{PDMITPMCONNECTOR,pfnCmdExec} */
168	static DECLCALLBACK(int) drvTpmEmuTpmsCmdExec(PPDMITPMCONNECTOR pInterface, uint8_t bLoc, const void pvCmd, size_t cbCmd, void pvResp, size_t cbResp)
169	{
170	PDRVTPMEMU pThis = RT_FROM_MEMBER(pInterface, DRVTPMEMU, ITpmConnector);
171
172	pThis->bLoc = bLoc;
173
174	uint8_t *pbRespBuf = NULL;
175	uint32_t cbRespBuf = 0;
176	uint32_t cbRespActual = 0;
177	TPM_RESULT rcTpm = TPMLIB_Process(&pbRespBuf, &cbRespActual, &cbRespBuf, (uint8_t *)pvCmd, (uint32_t)cbCmd);
178	if (RT_LIKELY(rcTpm == TPM_SUCCESS))
179	{
180	memcpy(pvResp, pbRespBuf, RT_MIN(cbResp, cbRespActual));
181	free(pbRespBuf);
182	return VINF_SUCCESS;
183	}
184
185	LogRelMax(10, ("DrvTpmEmuTpms#%u: Failed to execute command with %#x\n",
186	pThis->pDrvIns->iInstance, rcTpm));
187	return VERR_DEV_IO_ERROR;
188	}
189
190
191	/** @interface_method_impl{PDMITPMCONNECTOR,pfnCmdCancel} */
192	static DECLCALLBACK(int) drvTpmEmuTpmsCmdCancel(PPDMITPMCONNECTOR pInterface)
193	{
194	PDRVTPMEMU pThis = RT_FROM_MEMBER(pInterface, DRVTPMEMU, ITpmConnector);
195
196	TPM_RESULT rcTpm = TPMLIB_CancelCommand();
197	if (RT_LIKELY(rcTpm == TPM_SUCCESS))
198	return VINF_SUCCESS;
199
200	LogRelMax(10, ("DrvTpmEmuTpms#%u: Failed to cancel outstanding command with %#x\n",
201	pThis->pDrvIns->iInstance, rcTpm));
202	return VERR_DEV_IO_ERROR;
203	}
204
205
206	/** @interface_method_impl{PDMIBASE,pfnQueryInterface} */
207	static DECLCALLBACK(void ) drvTpmEmuTpmsQueryInterface(PPDMIBASE pInterface, const char pszIID)
208	{
209	PPDMDRVINS pDrvIns = PDMIBASE_2_PDMDRV(pInterface);
210	PDRVTPMEMU pThis = PDMINS_2_DATA(pDrvIns, PDRVTPMEMU);
211	PDMIBASE_RETURN_INTERFACE(pszIID, PDMIBASE, &pDrvIns->IBase);
212	PDMIBASE_RETURN_INTERFACE(pszIID, PDMITPMCONNECTOR, &pThis->ITpmConnector);
213	return NULL;
214	}
215
216
217	/* -=-=-=-=- libtpms_callbacks -=-=-=-=- */
218
219
220	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkNvRamInit(void)
221	{
222	PDRVTPMEMU pThis = g_pDrvTpmEmuTpms;
223	RT_NOREF(pThis);
224
225	return TPM_SUCCESS;
226	}
227
228
229	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkNvRamLoadData(uint8_t *ppvData, uint32_t pcbLength,
230	uint32_t idTpm, const char *pszName)
231	{
232	PDRVTPMEMU pThis = g_pDrvTpmEmuTpms;
233
234	AssertReturn(idTpm == 0, TPM_FAIL);
235
236	uint64_t cbState = 0;
237	int rc = pThis->pDrvVfs->pfnQuerySize(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, pszName, &cbState);
238	if ( RT_SUCCESS(rc)
239	&& cbState == (uint32_t)cbState)
240	{
241	void *pvData = malloc(cbState);
242	if (RT_LIKELY(pvData))
243	{
244	rc = pThis->pDrvVfs->pfnReadAll(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, pszName,
245	pvData, cbState);
246	if (RT_SUCCESS(rc))
247	{
248	ppvData = (uint8_t )pvData;
249	*pcbLength = (uint32_t)cbState;
250	return VINF_SUCCESS;
251	}
252
253	free(pvData);
254	}
255	}
256	else if (rc == VERR_NOT_FOUND)
257	return TPM_RETRY; /* This is fine for the first start of a new VM. */
258
259	return TPM_FAIL;
260	}
261
262
263	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkNvRamStoreData(const uint8_t *pvData, uint32_t cbLength,
264	uint32_t idTpm, const char *pszName)
265	{
266	PDRVTPMEMU pThis = g_pDrvTpmEmuTpms;
267
268	AssertReturn(idTpm == 0, TPM_FAIL);
269
270	int rc = pThis->pDrvVfs->pfnWriteAll(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, pszName,
271	pvData, cbLength);
272	if (RT_SUCCESS(rc))
273	return TPM_SUCCESS;
274
275	return TPM_FAIL;
276	}
277
278
279	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkNvRamDeleteName(uint32_t idTpm, const char *pszName, TPM_BOOL fMustExist)
280	{
281	PDRVTPMEMU pThis = g_pDrvTpmEmuTpms;
282
283	AssertReturn(idTpm == 0, TPM_FAIL);
284
285	int rc = pThis->pDrvVfs->pfnDelete(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, pszName);
286	if ( RT_SUCCESS(rc)
287	\|\| ( rc == VERR_NOT_FOUND
288	&& !fMustExist))
289	return TPM_SUCCESS;
290
291	return TPM_FAIL;
292	}
293
294
295	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkIoInit(void)
296	{
297	return TPM_SUCCESS;
298	}
299
300
301	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkIoGetLocality(TPM_MODIFIER_INDICATOR *pLocalityModifier, uint32_t idTpm)
302	{
303	PDRVTPMEMU pThis = g_pDrvTpmEmuTpms;
304
305	AssertReturn(idTpm == 0, TPM_FAIL);
306
307	*pLocalityModifier = pThis->bLoc;
308	return TPM_SUCCESS;
309	}
310
311
312	static DECLCALLBACK(TPM_RESULT) drvTpmEmuTpmsCbkIoGetPhysicalPresence(TPM_BOOL *pfPhysicalPresence, uint32_t idTpm)
313	{
314	AssertReturn(idTpm == 0, TPM_FAIL);
315
316	*pfPhysicalPresence = TRUE;
317	return TPM_SUCCESS;
318	}
319
320
321	/* -=-=-=-=-=-=-=-=- Saved State -=-=-=-=-=-=-=-=- */
322
323	/**
324	* @callback_method_impl{FNSSMDRVSAVEPREP}
325	*/
326	static DECLCALLBACK(int) drvTpmEmuTpmsSavePrep(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM)
327	{
328	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
329
330	PDRVTPMEMU pThis = PDMINS_2_DATA(pDrvIns, PDRVTPMEMU);
331	RT_NOREF(pSSM);
332
333	/*
334	* libtpms never saves the volatile state on its own, we can only get at it through
335	* TPMLIB_GetState().
336	*/
337	int rc = VINF_SUCCESS;
338	uint8_t *pbTpmState = NULL;
339	uint32_t cbTpmState = 0;
340	TPM_RESULT rcTpm = TPMLIB_GetState(TPMLIB_STATE_VOLATILE, &pbTpmState, &cbTpmState);
341	if (rcTpm == TPM_SUCCESS)
342	{
343	/* Save the volatile state in the VFS so it can get loaded on resume. */
344	rc = pThis->pDrvVfs->pfnWriteAll(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, TPM_VOLATILESTATE_NAME,
345	pbTpmState, cbTpmState);
346	free(pbTpmState);
347	if (RT_SUCCESS(rc))
348	{
349	rcTpm = TPMLIB_GetState(TPMLIB_STATE_PERMANENT, &pbTpmState, &cbTpmState);
350	if (rcTpm == TPM_SUCCESS)
351	{
352	rc = pThis->pDrvVfs->pfnWriteAll(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, TPM_PERMANENT_ALL_NAME,
353	pbTpmState, cbTpmState);
354	free(pbTpmState);
355	}
356	else
357	rc = VERR_NO_MEMORY;
358	}
359	}
360	else
361	rc = VERR_NO_MEMORY;
362
363	return rc;
364	}
365
366
367	/**
368	* @callback_method_impl{FNSSMDRVLOADDONE}
369	*/
370	static DECLCALLBACK(int) drvTpmEmuTpmsLoadDone(PPDMDRVINS pDrvIns, PSSMHANDLE pSSM)
371	{
372	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
373
374	PDRVTPMEMU pThis = PDMINS_2_DATA(pDrvIns, PDRVTPMEMU);
375	RT_NOREF(pSSM);
376
377	/* Need to construct the TPM here which will load the volatile state saved during the save state operation. */
378	TPM_RESULT rcTpm = TPMLIB_MainInit();
379	if (RT_UNLIKELY(rcTpm != TPM_SUCCESS))
380	{
381	LogRel(("DrvTpmEmuTpms#%u: Failed to initialize TPM emulation with %#x\n",
382	pDrvIns->iInstance, rcTpm));
383	PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS, "Failed to startup the TPM with %u", rcTpm);
384	}
385
386	/*
387	* Need to delete the volatile state after loading was done or it will still be present
388	* next time the VM is powered on without a saved state.
389	*/
390	int rc = pThis->pDrvVfs->pfnDelete(pThis->pDrvVfs, pThis->pDrvIns->pReg->szName, TPM_VOLATILESTATE_NAME);
391	Assert(RT_SUCCESS(rc) \|\| rc == VERR_NOT_FOUND); RT_NOREF(rc);
392
393	return VINF_SUCCESS;
394	}
395
396
397	/* -=-=-=-=- PDMDRVREG -=-=-=-=- */
398
399	/**
400	* @interface_method_impl{PDMDRVREG,pfnPowerOn}
401	*/
402	static DECLCALLBACK(void) drvTpmEmuTpmsPowerOn(PPDMDRVINS pDrvIns)
403	{
404	PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
405
406	TPM_RESULT rcTpm = TPMLIB_MainInit();
407	if (RT_UNLIKELY(rcTpm != TPM_SUCCESS))
408	{
409	LogRel(("DrvTpmEmuTpms#%u: Failed to initialize TPM emulation with %#x\n",
410	pDrvIns->iInstance, rcTpm));
411	PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS, "Failed to startup the TPM with %u", rcTpm);
412	}
413	}
414
415
416	/**
417	* @interface_method_impl{PDMDRVREG,pfnReset}
418	*/
419	static DECLCALLBACK(void) drvTpmEmuTpmsReset(PPDMDRVINS pDrvIns)
420	{
421	PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
422
423	TPMLIB_Terminate();
424	TPM_RESULT rcTpm = TPMLIB_MainInit();
425	if (RT_UNLIKELY(rcTpm != TPM_SUCCESS))
426	{
427	LogRel(("DrvTpmEmuTpms#%u: Failed to reset TPM emulation with %#x\n",
428	pDrvIns->iInstance, rcTpm));
429	PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS, "Failed to startup the TPM with %u", rcTpm);
430	}
431	}
432
433
434	/**
435	* @interface_method_impl{PDMDRVREG,pfnPowerOff}
436	*/
437	static DECLCALLBACK(void) drvTpmEmuTpmsPowerOff(PPDMDRVINS pDrvIns)
438	{
439	PDMDRV_CHECK_VERSIONS_RETURN_VOID(pDrvIns);
440
441	TPMLIB_Terminate();
442	}
443
444
445	/** @copydoc FNPDMDRVCONSTRUCT */
446	static DECLCALLBACK(int) drvTpmEmuTpmsConstruct(PPDMDRVINS pDrvIns, PCFGMNODE pCfg, uint32_t fFlags)
447	{
448	RT_NOREF(fFlags);
449	PDMDRV_CHECK_VERSIONS_RETURN(pDrvIns);
450	PDRVTPMEMU pThis = PDMINS_2_DATA(pDrvIns, PDRVTPMEMU);
451	PCPDMDRVHLPR3 pHlp = pDrvIns->pHlpR3;
452
453	/*
454	* Init the static parts.
455	*/
456	pThis->pDrvIns = pDrvIns;
457	pThis->enmVersion = TPMVERSION_UNKNOWN;
458	pThis->bLoc = TPM_NO_LOCALITY_SELECTED;
459
460	/* IBase */
461	pDrvIns->IBase.pfnQueryInterface = drvTpmEmuTpmsQueryInterface;
462	/* ITpmConnector */
463	pThis->ITpmConnector.pfnGetVersion = drvTpmEmuTpmsGetVersion;
464	pThis->ITpmConnector.pfnGetLocalityMax = drvTpmEmuGetLocalityMax;
465	pThis->ITpmConnector.pfnGetBufferSize = drvTpmEmuGetBufferSize;
466	pThis->ITpmConnector.pfnGetEstablishedFlag = drvTpmEmuTpmsGetEstablishedFlag;
467	pThis->ITpmConnector.pfnResetEstablishedFlag = drvTpmEmuTpmsResetEstablishedFlag;
468	pThis->ITpmConnector.pfnCmdExec = drvTpmEmuTpmsCmdExec;
469	pThis->ITpmConnector.pfnCmdCancel = drvTpmEmuTpmsCmdCancel;
470
471	/*
472	* Validate and read the configuration.
473	*/
474	PDMDRV_VALIDATE_CONFIG_RETURN(pDrvIns, "TpmVersion\|BufferSize", "");
475
476	#if 0
477	TPMLIB_SetDebugFD(STDERR_FILENO);
478	TPMLIB_SetDebugLevel(~0);
479	#endif
480
481	/*
482	* Try attach the VFS driver below and query it's VFS interface.
483	*/
484	PPDMIBASE pBase = NULL;
485	int rc = PDMDrvHlpAttach(pDrvIns, fFlags, &pBase);
486	if (RT_FAILURE(rc))
487	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
488	N_("Failed to attach driver below us! %Rrc"), rc);
489	pThis->pDrvVfs = PDMIBASE_QUERY_INTERFACE(pBase, PDMIVFSCONNECTOR);
490	if (!pThis->pDrvVfs)
491	return PDMDRV_SET_ERROR(pDrvIns, VERR_PDM_MISSING_INTERFACE_BELOW,
492	N_("No VFS interface below"));
493
494	TPMLIB_TPMVersion enmVersion = TPMLIB_TPM_VERSION_2;
495	uint32_t uTpmVersion = 0;
496	rc = pHlp->pfnCFGMQueryU32Def(pCfg, "TpmVersion", &uTpmVersion, 2);
497	if (RT_FAILURE(rc))
498	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
499	N_("Configuration error: querying \"TpmVersion\" resulted in %Rrc"), rc);
500
501	switch (uTpmVersion)
502	{
503	case 1:
504	enmVersion = TPMLIB_TPM_VERSION_1_2;
505	pThis->enmVersion = TPMVERSION_1_2;
506	break;
507	case 2:
508	enmVersion = TPMLIB_TPM_VERSION_2;
509	pThis->enmVersion = TPMVERSION_2_0;
510	break;
511	default:
512	return PDMDrvHlpVMSetError(pDrvIns, VERR_NOT_SUPPORTED, RT_SRC_POS,
513	N_("Configuration error: \"TpmVersion\" %u is not supported"), uTpmVersion);
514	}
515
516	TPM_RESULT rcTpm = TPMLIB_ChooseTPMVersion(enmVersion);
517	if (rcTpm != TPM_SUCCESS)
518	return PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
519	N_("Failed to set the TPM version for the emulated TPM with %d"), rcTpm);
520
521	int cbBufferMax = 0;
522	rcTpm = TPMLIB_GetTPMProperty(TPMPROP_TPM_BUFFER_MAX, &cbBufferMax);
523	if (rcTpm != TPM_SUCCESS)
524	return PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
525	N_("Querying the maximum supported buffer size failed with %u"), rcTpm);
526
527	rc = pHlp->pfnCFGMQueryU32Def(pCfg, "BufferSize", &pThis->cbBuffer, (uint32_t)cbBufferMax);
528	if (RT_FAILURE(rc))
529	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
530	N_("Configuration error: querying \"BufferSize\" resulted in %Rrc"), rc);
531
532	uint32_t cbBufferMin = 0;
533	uint32_t cbBuffer = TPMLIB_SetBufferSize(pThis->cbBuffer, &cbBufferMin, NULL /max_size/);
534	if (pThis->cbBuffer != cbBuffer)
535	return PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
536	N_("Failed to set buffer size (%u) of the emulated TPM with %u (min %u, max %d)"),
537	pThis->cbBuffer, cbBuffer, cbBufferMin, cbBufferMax);
538
539	struct libtpms_callbacks Callbacks;
540	Callbacks.sizeOfStruct = sizeof(Callbacks);
541	Callbacks.tpm_nvram_init = drvTpmEmuTpmsCbkNvRamInit;
542	Callbacks.tpm_nvram_loaddata = drvTpmEmuTpmsCbkNvRamLoadData;
543	Callbacks.tpm_nvram_storedata = drvTpmEmuTpmsCbkNvRamStoreData;
544	Callbacks.tpm_nvram_deletename = drvTpmEmuTpmsCbkNvRamDeleteName;
545	Callbacks.tpm_io_init = drvTpmEmuTpmsCbkIoInit;
546	Callbacks.tpm_io_getlocality = drvTpmEmuTpmsCbkIoGetLocality;
547	Callbacks.tpm_io_getphysicalpresence = drvTpmEmuTpmsCbkIoGetPhysicalPresence;
548	rcTpm = TPMLIB_RegisterCallbacks(&Callbacks);
549	if (rcTpm != TPM_SUCCESS)
550	return PDMDrvHlpVMSetError(pDrvIns, VERR_INVALID_PARAMETER, RT_SRC_POS,
551	N_("Failed to register callbacks with the TPM emulation: %u"),
552	rcTpm);
553
554	rc = PDMDrvHlpSSMRegisterEx(pDrvIns, 0 /uVersion/, 0 /cbGuess/,
555	NULL /pfnLivePrep/, NULL /pfnLiveExec/, NULL /pfnLiveVote/,
556	drvTpmEmuTpmsSavePrep /pfnSavePrep/, NULL /pfnSaveExec/, NULL /pfnSaveDone/,
557	NULL /pfnLoadPrep/, NULL /pfnLoadExec/, drvTpmEmuTpmsLoadDone /pfnLoadDone/);
558	if (RT_FAILURE(rc))
559	return PDMDrvHlpVMSetError(pDrvIns, rc, RT_SRC_POS,
560	N_("Failed to register saved state handlers"));
561
562	/* We can only have one instance of the TPM emulation and require the global variable for the callbacks unfortunately. */
563	g_pDrvTpmEmuTpms = pThis;
564	return VINF_SUCCESS;
565	}
566
567
568	/**
569	* TPM libtpms emulator driver registration record.
570	*/
571	const PDMDRVREG g_DrvTpmEmuTpms =
572	{
573	/* u32Version */
574	PDM_DRVREG_VERSION,
575	/* szName */
576	"TpmEmuTpms",
577	/* szRCMod */
578	"",
579	/* szR0Mod */
580	"",
581	/* pszDescription */
582	"TPM emulation driver based on libtpms.",
583	/* fFlags */
584	PDM_DRVREG_FLAGS_HOST_BITS_DEFAULT,
585	/* fClass. */
586	PDM_DRVREG_CLASS_STREAM,
587	/* cMaxInstances */
588	1,
589	/* cbInstance */
590	sizeof(DRVTPMEMU),
591	/* pfnConstruct */
592	drvTpmEmuTpmsConstruct,
593	/* pfnDestruct */
594	NULL,
595	/* pfnRelocate */
596	NULL,
597	/* pfnIOCtl */
598	NULL,
599	/* pfnPowerOn */
600	drvTpmEmuTpmsPowerOn,
601	/* pfnReset */
602	drvTpmEmuTpmsReset,
603	/* pfnSuspend */
604	NULL,
605	/* pfnResume */
606	NULL,
607	/* pfnAttach */
608	NULL,
609	/* pfnDetach */
610	NULL,
611	/* pfnPowerOff */
612	drvTpmEmuTpmsPowerOff,
613	/* pfnSoftReset */
614	NULL,
615	/* u32EndVersion */
616	PDM_DRVREG_VERSION
617	};
618

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source: vbox/trunk/src/VBox/Devices/Security/DrvTpmEmuTpms.cpp

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