aboutsummaryrefslogtreecommitdiff
path: root/hw/tpm/tpm_emulator.c
blob: 6418ef08310f401de5fea9c429a4c97bfd21e41f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
/*
 *  Emulator TPM driver
 *
 *  Copyright (c) 2017 Intel Corporation
 *  Author: Amarnath Valluri <amarnath.valluri@intel.com>
 *
 *  Copyright (c) 2010 - 2013 IBM Corporation
 *  Authors:
 *    Stefan Berger <stefanb@us.ibm.com>
 *
 *  Copyright (C) 2011 IAIK, Graz University of Technology
 *    Author: Andreas Niederl
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, see <http://www.gnu.org/licenses/>
 *
 */

#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/sockets.h"
#include "io/channel-socket.h"
#include "sysemu/tpm_backend.h"
#include "tpm_int.h"
#include "hw/hw.h"
#include "tpm_util.h"
#include "tpm_ioctl.h"
#include "migration/blocker.h"
#include "qapi/error.h"
#include "qapi/clone-visitor.h"
#include "qapi/qapi-visit-tpm.h"
#include "chardev/char-fe.h"
#include "trace.h"

#define TYPE_TPM_EMULATOR "tpm-emulator"
#define TPM_EMULATOR(obj) \
    OBJECT_CHECK(TPMEmulator, (obj), TYPE_TPM_EMULATOR)

#define TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(S, cap) (((S)->caps & (cap)) == (cap))

/* data structures */
typedef struct TPMEmulator {
    TPMBackend parent;

    TPMEmulatorOptions *options;
    CharBackend ctrl_chr;
    QIOChannel *data_ioc;
    TPMVersion tpm_version;
    ptm_cap caps; /* capabilities of the TPM */
    uint8_t cur_locty_number; /* last set locality */
    Error *migration_blocker;

    QemuMutex mutex;

    unsigned int established_flag:1;
    unsigned int established_flag_cached:1;
} TPMEmulator;


static int tpm_emulator_ctrlcmd(TPMEmulator *tpm, unsigned long cmd, void *msg,
                                size_t msg_len_in, size_t msg_len_out)
{
    CharBackend *dev = &tpm->ctrl_chr;
    uint32_t cmd_no = cpu_to_be32(cmd);
    ssize_t n = sizeof(uint32_t) + msg_len_in;
    uint8_t *buf = NULL;
    int ret = -1;

    qemu_mutex_lock(&tpm->mutex);

    buf = g_alloca(n);
    memcpy(buf, &cmd_no, sizeof(cmd_no));
    memcpy(buf + sizeof(cmd_no), msg, msg_len_in);

    n = qemu_chr_fe_write_all(dev, buf, n);
    if (n <= 0) {
        goto end;
    }

    if (msg_len_out != 0) {
        n = qemu_chr_fe_read_all(dev, msg, msg_len_out);
        if (n <= 0) {
            goto end;
        }
    }

    ret = 0;

end:
    qemu_mutex_unlock(&tpm->mutex);
    return ret;
}

static int tpm_emulator_unix_tx_bufs(TPMEmulator *tpm_emu,
                                     const uint8_t *in, uint32_t in_len,
                                     uint8_t *out, uint32_t out_len,
                                     bool *selftest_done,
                                     Error **err)
{
    ssize_t ret;
    bool is_selftest = false;

    if (selftest_done) {
        *selftest_done = false;
        is_selftest = tpm_util_is_selftest(in, in_len);
    }

    ret = qio_channel_write_all(tpm_emu->data_ioc, (char *)in, in_len, err);
    if (ret != 0) {
        return -1;
    }

    ret = qio_channel_read_all(tpm_emu->data_ioc, (char *)out,
              sizeof(struct tpm_resp_hdr), err);
    if (ret != 0) {
        return -1;
    }

    ret = qio_channel_read_all(tpm_emu->data_ioc,
              (char *)out + sizeof(struct tpm_resp_hdr),
              tpm_cmd_get_size(out) - sizeof(struct tpm_resp_hdr), err);
    if (ret != 0) {
        return -1;
    }

    if (is_selftest) {
        *selftest_done = tpm_cmd_get_errcode(out) == 0;
    }

    return 0;
}

static int tpm_emulator_set_locality(TPMEmulator *tpm_emu, uint8_t locty_number,
                                     Error **errp)
{
    ptm_loc loc;

    if (tpm_emu->cur_locty_number == locty_number) {
        return 0;
    }

    trace_tpm_emulator_set_locality(locty_number);

    loc.u.req.loc = locty_number;
    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_LOCALITY, &loc,
                             sizeof(loc), sizeof(loc)) < 0) {
        error_setg(errp, "tpm-emulator: could not set locality : %s",
                   strerror(errno));
        return -1;
    }

    loc.u.resp.tpm_result = be32_to_cpu(loc.u.resp.tpm_result);
    if (loc.u.resp.tpm_result != 0) {
        error_setg(errp, "tpm-emulator: TPM result for set locality : 0x%x",
                   loc.u.resp.tpm_result);
        return -1;
    }

    tpm_emu->cur_locty_number = locty_number;

    return 0;
}

static void tpm_emulator_handle_request(TPMBackend *tb, TPMBackendCmd *cmd,
                                        Error **errp)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);

    trace_tpm_emulator_handle_request();

    if (tpm_emulator_set_locality(tpm_emu, cmd->locty, errp) < 0 ||
        tpm_emulator_unix_tx_bufs(tpm_emu, cmd->in, cmd->in_len,
                                  cmd->out, cmd->out_len,
                                  &cmd->selftest_done, errp) < 0) {
        tpm_util_write_fatal_error_response(cmd->out, cmd->out_len);
    }
}

static int tpm_emulator_probe_caps(TPMEmulator *tpm_emu)
{
    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_CAPABILITY,
                             &tpm_emu->caps, 0, sizeof(tpm_emu->caps)) < 0) {
        error_report("tpm-emulator: probing failed : %s", strerror(errno));
        return -1;
    }

    tpm_emu->caps = be64_to_cpu(tpm_emu->caps);

    trace_tpm_emulator_probe_caps(tpm_emu->caps);

    return 0;
}

static int tpm_emulator_check_caps(TPMEmulator *tpm_emu)
{
    ptm_cap caps = 0;
    const char *tpm = NULL;

    /* check for min. required capabilities */
    switch (tpm_emu->tpm_version) {
    case TPM_VERSION_1_2:
        caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED |
               PTM_CAP_SET_LOCALITY | PTM_CAP_SET_DATAFD | PTM_CAP_STOP |
               PTM_CAP_SET_BUFFERSIZE;
        tpm = "1.2";
        break;
    case TPM_VERSION_2_0:
        caps = PTM_CAP_INIT | PTM_CAP_SHUTDOWN | PTM_CAP_GET_TPMESTABLISHED |
               PTM_CAP_SET_LOCALITY | PTM_CAP_RESET_TPMESTABLISHED |
               PTM_CAP_SET_DATAFD | PTM_CAP_STOP | PTM_CAP_SET_BUFFERSIZE;
        tpm = "2";
        break;
    case TPM_VERSION_UNSPEC:
        error_report("tpm-emulator: TPM version has not been set");
        return -1;
    }

    if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, caps)) {
        error_report("tpm-emulator: TPM does not implement minimum set of "
                     "required capabilities for TPM %s (0x%x)", tpm, (int)caps);
        return -1;
    }

    return 0;
}

static int tpm_emulator_stop_tpm(TPMBackend *tb)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_res res;

    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_STOP, &res, 0, sizeof(res)) < 0) {
        error_report("tpm-emulator: Could not stop TPM: %s",
                     strerror(errno));
        return -1;
    }

    res = be32_to_cpu(res);
    if (res) {
        error_report("tpm-emulator: TPM result for CMD_STOP: 0x%x", res);
        return -1;
    }

    return 0;
}

static int tpm_emulator_set_buffer_size(TPMBackend *tb,
                                        size_t wanted_size,
                                        size_t *actual_size)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_setbuffersize psbs;

    if (tpm_emulator_stop_tpm(tb) < 0) {
        return -1;
    }

    psbs.u.req.buffersize = cpu_to_be32(wanted_size);

    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_BUFFERSIZE, &psbs,
                             sizeof(psbs.u.req), sizeof(psbs.u.resp)) < 0) {
        error_report("tpm-emulator: Could not set buffer size: %s",
                     strerror(errno));
        return -1;
    }

    psbs.u.resp.tpm_result = be32_to_cpu(psbs.u.resp.tpm_result);
    if (psbs.u.resp.tpm_result != 0) {
        error_report("tpm-emulator: TPM result for set buffer size : 0x%x",
                     psbs.u.resp.tpm_result);
        return -1;
    }

    if (actual_size) {
        *actual_size = be32_to_cpu(psbs.u.resp.buffersize);
    }

    trace_tpm_emulator_set_buffer_size(
            be32_to_cpu(psbs.u.resp.buffersize),
            be32_to_cpu(psbs.u.resp.minsize),
            be32_to_cpu(psbs.u.resp.maxsize));

    return 0;
}

static int tpm_emulator_startup_tpm(TPMBackend *tb, size_t buffersize)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_init init = {
        .u.req.init_flags = 0,
    };
    ptm_res res;

    if (buffersize != 0 &&
        tpm_emulator_set_buffer_size(tb, buffersize, NULL) < 0) {
        goto err_exit;
    }

    trace_tpm_emulator_startup_tpm();
    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_INIT, &init, sizeof(init),
                             sizeof(init)) < 0) {
        error_report("tpm-emulator: could not send INIT: %s",
                     strerror(errno));
        goto err_exit;
    }

    res = be32_to_cpu(init.u.resp.tpm_result);
    if (res) {
        error_report("tpm-emulator: TPM result for CMD_INIT: 0x%x", res);
        goto err_exit;
    }
    return 0;

err_exit:
    return -1;
}

static bool tpm_emulator_get_tpm_established_flag(TPMBackend *tb)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_est est;

    if (tpm_emu->established_flag_cached) {
        return tpm_emu->established_flag;
    }

    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_TPMESTABLISHED, &est,
                             0, sizeof(est)) < 0) {
        error_report("tpm-emulator: Could not get the TPM established flag: %s",
                     strerror(errno));
        return false;
    }
    trace_tpm_emulator_get_tpm_established_flag(est.u.resp.bit);

    tpm_emu->established_flag_cached = 1;
    tpm_emu->established_flag = (est.u.resp.bit != 0);

    return tpm_emu->established_flag;
}

static int tpm_emulator_reset_tpm_established_flag(TPMBackend *tb,
                                                   uint8_t locty)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_reset_est reset_est;
    ptm_res res;

    /* only a TPM 2.0 will support this */
    if (tpm_emu->tpm_version != TPM_VERSION_2_0) {
        return 0;
    }

    reset_est.u.req.loc = tpm_emu->cur_locty_number;
    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_RESET_TPMESTABLISHED,
                             &reset_est, sizeof(reset_est),
                             sizeof(reset_est)) < 0) {
        error_report("tpm-emulator: Could not reset the establishment bit: %s",
                     strerror(errno));
        return -1;
    }

    res = be32_to_cpu(reset_est.u.resp.tpm_result);
    if (res) {
        error_report("tpm-emulator: TPM result for rest establixhed flag: 0x%x",
                     res);
        return -1;
    }

    tpm_emu->established_flag_cached = 0;

    return 0;
}

static void tpm_emulator_cancel_cmd(TPMBackend *tb)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_res res;

    if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, PTM_CAP_CANCEL_TPM_CMD)) {
        trace_tpm_emulator_cancel_cmd_not_supt();
        return;
    }

    /* FIXME: make the function non-blocking, or it may block a VCPU */
    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_CANCEL_TPM_CMD, &res, 0,
                             sizeof(res)) < 0) {
        error_report("tpm-emulator: Could not cancel command: %s",
                     strerror(errno));
    } else if (res != 0) {
        error_report("tpm-emulator: Failed to cancel TPM: 0x%x",
                     be32_to_cpu(res));
    }
}

static TPMVersion tpm_emulator_get_tpm_version(TPMBackend *tb)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);

    return tpm_emu->tpm_version;
}

static size_t tpm_emulator_get_buffer_size(TPMBackend *tb)
{
    size_t actual_size;

    if (tpm_emulator_set_buffer_size(tb, 0, &actual_size) < 0) {
        return 4096;
    }

    return actual_size;
}

static int tpm_emulator_block_migration(TPMEmulator *tpm_emu)
{
    Error *err = NULL;

    error_setg(&tpm_emu->migration_blocker,
               "Migration disabled: TPM emulator not yet migratable");
    migrate_add_blocker(tpm_emu->migration_blocker, &err);
    if (err) {
        error_report_err(err);
        error_free(tpm_emu->migration_blocker);
        tpm_emu->migration_blocker = NULL;

        return -1;
    }

    return 0;
}

static int tpm_emulator_prepare_data_fd(TPMEmulator *tpm_emu)
{
    ptm_res res;
    Error *err = NULL;
    int fds[2] = { -1, -1 };

    if (socketpair(AF_UNIX, SOCK_STREAM, 0, fds) < 0) {
        error_report("tpm-emulator: Failed to create socketpair");
        return -1;
    }

    qemu_chr_fe_set_msgfds(&tpm_emu->ctrl_chr, fds + 1, 1);

    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_DATAFD, &res, 0,
                             sizeof(res)) < 0 || res != 0) {
        error_report("tpm-emulator: Failed to send CMD_SET_DATAFD: %s",
                     strerror(errno));
        goto err_exit;
    }

    tpm_emu->data_ioc = QIO_CHANNEL(qio_channel_socket_new_fd(fds[0], &err));
    if (err) {
        error_prepend(&err, "tpm-emulator: Failed to create io channel: ");
        error_report_err(err);
        goto err_exit;
    }

    closesocket(fds[1]);

    return 0;

err_exit:
    closesocket(fds[0]);
    closesocket(fds[1]);
    return -1;
}

static int tpm_emulator_handle_device_opts(TPMEmulator *tpm_emu, QemuOpts *opts)
{
    const char *value;

    value = qemu_opt_get(opts, "chardev");
    if (value) {
        Error *err = NULL;
        Chardev *dev = qemu_chr_find(value);

        if (!dev) {
            error_report("tpm-emulator: tpm chardev '%s' not found.", value);
            goto err;
        }

        if (!qemu_chr_fe_init(&tpm_emu->ctrl_chr, dev, &err)) {
            error_prepend(&err, "tpm-emulator: No valid chardev found at '%s':",
                          value);
            error_report_err(err);
            goto err;
        }

        tpm_emu->options->chardev = g_strdup(value);
    }

    if (tpm_emulator_prepare_data_fd(tpm_emu) < 0) {
        goto err;
    }

    /* FIXME: tpm_util_test_tpmdev() accepts only on socket fd, as it also used
     * by passthrough driver, which not yet using GIOChannel.
     */
    if (tpm_util_test_tpmdev(QIO_CHANNEL_SOCKET(tpm_emu->data_ioc)->fd,
                             &tpm_emu->tpm_version)) {
        error_report("'%s' is not emulating TPM device. Error: %s",
                      tpm_emu->options->chardev, strerror(errno));
        goto err;
    }

    switch (tpm_emu->tpm_version) {
    case TPM_VERSION_1_2:
        trace_tpm_emulator_handle_device_opts_tpm12();
        break;
    case TPM_VERSION_2_0:
        trace_tpm_emulator_handle_device_opts_tpm2();
        break;
    default:
        trace_tpm_emulator_handle_device_opts_unspec();
    }

    if (tpm_emulator_probe_caps(tpm_emu) ||
        tpm_emulator_check_caps(tpm_emu)) {
        goto err;
    }

    return tpm_emulator_block_migration(tpm_emu);

err:
    trace_tpm_emulator_handle_device_opts_startup_error();

    return -1;
}

static TPMBackend *tpm_emulator_create(QemuOpts *opts)
{
    TPMBackend *tb = TPM_BACKEND(object_new(TYPE_TPM_EMULATOR));

    if (tpm_emulator_handle_device_opts(TPM_EMULATOR(tb), opts)) {
        object_unref(OBJECT(tb));
        return NULL;
    }

    return tb;
}

static TpmTypeOptions *tpm_emulator_get_tpm_options(TPMBackend *tb)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    TpmTypeOptions *options = g_new0(TpmTypeOptions, 1);

    options->type = TPM_TYPE_OPTIONS_KIND_EMULATOR;
    options->u.emulator.data = QAPI_CLONE(TPMEmulatorOptions, tpm_emu->options);

    return options;
}

static const QemuOptDesc tpm_emulator_cmdline_opts[] = {
    TPM_STANDARD_CMDLINE_OPTS,
    {
        .name = "chardev",
        .type = QEMU_OPT_STRING,
        .help = "Character device to use for out-of-band control messages",
    },
    { /* end of list */ },
};

static void tpm_emulator_inst_init(Object *obj)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(obj);

    trace_tpm_emulator_inst_init();

    tpm_emu->options = g_new0(TPMEmulatorOptions, 1);
    tpm_emu->cur_locty_number = ~0;
    qemu_mutex_init(&tpm_emu->mutex);
}

/*
 * Gracefully shut down the external TPM
 */
static void tpm_emulator_shutdown(TPMEmulator *tpm_emu)
{
    ptm_res res;

    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SHUTDOWN, &res, 0, sizeof(res)) < 0) {
        error_report("tpm-emulator: Could not cleanly shutdown the TPM: %s",
                     strerror(errno));
    } else if (res != 0) {
        error_report("tpm-emulator: TPM result for sutdown: 0x%x",
                     be32_to_cpu(res));
    }
}

static void tpm_emulator_inst_finalize(Object *obj)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(obj);

    tpm_emulator_shutdown(tpm_emu);

    object_unref(OBJECT(tpm_emu->data_ioc));

    qemu_chr_fe_deinit(&tpm_emu->ctrl_chr, false);

    qapi_free_TPMEmulatorOptions(tpm_emu->options);

    if (tpm_emu->migration_blocker) {
        migrate_del_blocker(tpm_emu->migration_blocker);
        error_free(tpm_emu->migration_blocker);
    }

    qemu_mutex_destroy(&tpm_emu->mutex);
}

static void tpm_emulator_class_init(ObjectClass *klass, void *data)
{
    TPMBackendClass *tbc = TPM_BACKEND_CLASS(klass);

    tbc->type = TPM_TYPE_EMULATOR;
    tbc->opts = tpm_emulator_cmdline_opts;
    tbc->desc = "TPM emulator backend driver";
    tbc->create = tpm_emulator_create;
    tbc->startup_tpm = tpm_emulator_startup_tpm;
    tbc->cancel_cmd = tpm_emulator_cancel_cmd;
    tbc->get_tpm_established_flag = tpm_emulator_get_tpm_established_flag;
    tbc->reset_tpm_established_flag = tpm_emulator_reset_tpm_established_flag;
    tbc->get_tpm_version = tpm_emulator_get_tpm_version;
    tbc->get_buffer_size = tpm_emulator_get_buffer_size;
    tbc->get_tpm_options = tpm_emulator_get_tpm_options;

    tbc->handle_request = tpm_emulator_handle_request;
}

static const TypeInfo tpm_emulator_info = {
    .name = TYPE_TPM_EMULATOR,
    .parent = TYPE_TPM_BACKEND,
    .instance_size = sizeof(TPMEmulator),
    .class_init = tpm_emulator_class_init,
    .instance_init = tpm_emulator_inst_init,
    .instance_finalize = tpm_emulator_inst_finalize,
};

static void tpm_emulator_register(void)
{
    type_register_static(&tpm_emulator_info);
}

type_init(tpm_emulator_register)