aboutsummaryrefslogtreecommitdiff
path: root/backends/tpm/tpm_emulator.c
blob: a012adc193417b460967c373d81598a4241ebf2d (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
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
/*
 *  Emulator TPM driver
 *
 *  Copyright (c) 2017 Intel Corporation
 *  Author: Amarnath Valluri <amarnath.valluri@intel.com>
 *
 *  Copyright (c) 2010 - 2013, 2018 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 2.1 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/module.h"
#include "qemu/sockets.h"
#include "io/channel-socket.h"
#include "sysemu/tpm_backend.h"
#include "sysemu/tpm_util.h"
#include "tpm_int.h"
#include "tpm_ioctl.h"
#include "migration/blocker.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/clone-visitor.h"
#include "qapi/qapi-visit-tpm.h"
#include "chardev/char-fe.h"
#include "trace.h"
#include "qom/object.h"

#define TYPE_TPM_EMULATOR "tpm-emulator"
OBJECT_DECLARE_SIMPLE_TYPE(TPMEmulator, TPM_EMULATOR)

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

/* data structures */

/* blobs from the TPM; part of VM state when migrating */
typedef struct TPMBlobBuffers {
    uint32_t permanent_flags;
    TPMSizedBuffer permanent;

    uint32_t volatil_flags;
    TPMSizedBuffer volatil;

    uint32_t savestate_flags;
    TPMSizedBuffer savestate;
} TPMBlobBuffers;

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;

    TPMBlobBuffers state_blobs;
};

struct tpm_error {
    uint32_t tpm_result;
    const char *string;
};

static const struct tpm_error tpm_errors[] = {
    /* TPM 1.2 error codes */
    { TPM_BAD_PARAMETER   , "a parameter is bad" },
    { TPM_FAIL            , "operation failed" },
    { TPM_KEYNOTFOUND     , "key could not be found" },
    { TPM_BAD_PARAM_SIZE  , "bad parameter size"},
    { TPM_ENCRYPT_ERROR   , "encryption error" },
    { TPM_DECRYPT_ERROR   , "decryption error" },
    { TPM_BAD_KEY_PROPERTY, "bad key property" },
    { TPM_BAD_MODE        , "bad (encryption) mode" },
    { TPM_BAD_VERSION     , "bad version identifier" },
    { TPM_BAD_LOCALITY    , "bad locality" },
    /* TPM 2 error codes */
    { TPM_RC_FAILURE     , "operation failed" },
    { TPM_RC_LOCALITY    , "bad locality"     },
    { TPM_RC_INSUFFICIENT, "insufficient amount of data" },
};

static const char *tpm_emulator_strerror(uint32_t tpm_result)
{
    size_t i;

    for (i = 0; i < ARRAY_SIZE(tpm_errors); i++) {
        if (tpm_errors[i].tpm_result == tpm_result) {
            return tpm_errors[i].string;
        }
    }
    return "";
}

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 **errp)
{
    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, errp);
    if (ret != 0) {
        return -1;
    }

    ret = qio_channel_read_all(tpm_emu->data_ioc, (char *)out,
              sizeof(struct tpm_resp_hdr), errp);
    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), errp);
    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);

    memset(&loc, 0, sizeof(loc));
    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 %s", res,
                     tpm_emulator_strerror(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 %s",
                     psbs.u.resp.tpm_result,
                     tpm_emulator_strerror(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_resume(TPMBackend *tb, size_t buffersize,
                                     bool is_resume)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    ptm_init init = {
        .u.req.init_flags = 0,
    };
    ptm_res res;

    trace_tpm_emulator_startup_tpm_resume(is_resume, buffersize);

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

    if (is_resume) {
        init.u.req.init_flags |= cpu_to_be32(PTM_INIT_FLAG_DELETE_VOLATILE);
    }

    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 %s", res,
                     tpm_emulator_strerror(res));
        goto err_exit;
    }
    return 0;

err_exit:
    return -1;
}

static int tpm_emulator_startup_tpm(TPMBackend *tb, size_t buffersize)
{
    return tpm_emulator_startup_tpm_resume(tb, buffersize, false);
}

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 established flag: 0x%x %s",
            res, tpm_emulator_strerror(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;
    ptm_cap caps = PTM_CAP_GET_STATEBLOB | PTM_CAP_SET_STATEBLOB |
                   PTM_CAP_STOP;

    if (!TPM_EMULATOR_IMPLEMENTS_ALL_CAPS(tpm_emu, caps)) {
        error_setg(&tpm_emu->migration_blocker,
                   "Migration disabled: TPM emulator does not support "
                   "migration");
        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;
    Error *err = NULL;
    Chardev *dev;

    value = qemu_opt_get(opts, "chardev");
    if (!value) {
        error_report("tpm-emulator: parameter 'chardev' is missing");
        goto err;
    }

    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 */ },
};

/*
 * Transfer a TPM state blob from the TPM into a provided buffer.
 *
 * @tpm_emu: TPMEmulator
 * @type: the type of blob to transfer
 * @tsb: the TPMSizeBuffer to fill with the blob
 * @flags: the flags to return to the caller
 */
static int tpm_emulator_get_state_blob(TPMEmulator *tpm_emu,
                                       uint8_t type,
                                       TPMSizedBuffer *tsb,
                                       uint32_t *flags)
{
    ptm_getstate pgs;
    ptm_res res;
    ssize_t n;
    uint32_t totlength, length;

    tpm_sized_buffer_reset(tsb);

    pgs.u.req.state_flags = cpu_to_be32(PTM_STATE_FLAG_DECRYPTED);
    pgs.u.req.type = cpu_to_be32(type);
    pgs.u.req.offset = 0;

    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_GET_STATEBLOB,
                             &pgs, sizeof(pgs.u.req),
                             offsetof(ptm_getstate, u.resp.data)) < 0) {
        error_report("tpm-emulator: could not get state blob type %d : %s",
                     type, strerror(errno));
        return -1;
    }

    res = be32_to_cpu(pgs.u.resp.tpm_result);
    if (res != 0 && (res & 0x800) == 0) {
        error_report("tpm-emulator: Getting the stateblob (type %d) failed "
                     "with a TPM error 0x%x %s", type, res,
                     tpm_emulator_strerror(res));
        return -1;
    }

    totlength = be32_to_cpu(pgs.u.resp.totlength);
    length = be32_to_cpu(pgs.u.resp.length);
    if (totlength != length) {
        error_report("tpm-emulator: Expecting to read %u bytes "
                     "but would get %u", totlength, length);
        return -1;
    }

    *flags = be32_to_cpu(pgs.u.resp.state_flags);

    if (totlength > 0) {
        tsb->buffer = g_try_malloc(totlength);
        if (!tsb->buffer) {
            error_report("tpm-emulator: Out of memory allocating %u bytes",
                         totlength);
            return -1;
        }

        n = qemu_chr_fe_read_all(&tpm_emu->ctrl_chr, tsb->buffer, totlength);
        if (n != totlength) {
            error_report("tpm-emulator: Could not read stateblob (type %d); "
                         "expected %u bytes, got %zd",
                         type, totlength, n);
            return -1;
        }
    }
    tsb->size = totlength;

    trace_tpm_emulator_get_state_blob(type, tsb->size, *flags);

    return 0;
}

static int tpm_emulator_get_state_blobs(TPMEmulator *tpm_emu)
{
    TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;

    if (tpm_emulator_get_state_blob(tpm_emu, PTM_BLOB_TYPE_PERMANENT,
                                    &state_blobs->permanent,
                                    &state_blobs->permanent_flags) < 0 ||
        tpm_emulator_get_state_blob(tpm_emu, PTM_BLOB_TYPE_VOLATILE,
                                    &state_blobs->volatil,
                                    &state_blobs->volatil_flags) < 0 ||
        tpm_emulator_get_state_blob(tpm_emu, PTM_BLOB_TYPE_SAVESTATE,
                                    &state_blobs->savestate,
                                    &state_blobs->savestate_flags) < 0) {
        goto err_exit;
    }

    return 0;

 err_exit:
    tpm_sized_buffer_reset(&state_blobs->volatil);
    tpm_sized_buffer_reset(&state_blobs->permanent);
    tpm_sized_buffer_reset(&state_blobs->savestate);

    return -1;
}

/*
 * Transfer a TPM state blob to the TPM emulator.
 *
 * @tpm_emu: TPMEmulator
 * @type: the type of TPM state blob to transfer
 * @tsb: TPMSizedBuffer containing the TPM state blob
 * @flags: Flags describing the (encryption) state of the TPM state blob
 */
static int tpm_emulator_set_state_blob(TPMEmulator *tpm_emu,
                                       uint32_t type,
                                       TPMSizedBuffer *tsb,
                                       uint32_t flags)
{
    ssize_t n;
    ptm_setstate pss;
    ptm_res tpm_result;

    if (tsb->size == 0) {
        return 0;
    }

    pss = (ptm_setstate) {
        .u.req.state_flags = cpu_to_be32(flags),
        .u.req.type = cpu_to_be32(type),
        .u.req.length = cpu_to_be32(tsb->size),
    };

    /* write the header only */
    if (tpm_emulator_ctrlcmd(tpm_emu, CMD_SET_STATEBLOB, &pss,
                             offsetof(ptm_setstate, u.req.data), 0) < 0) {
        error_report("tpm-emulator: could not set state blob type %d : %s",
                     type, strerror(errno));
        return -1;
    }

    /* now the body */
    n = qemu_chr_fe_write_all(&tpm_emu->ctrl_chr, tsb->buffer, tsb->size);
    if (n != tsb->size) {
        error_report("tpm-emulator: Writing the stateblob (type %d) "
                     "failed; could not write %u bytes, but only %zd",
                     type, tsb->size, n);
        return -1;
    }

    /* now get the result */
    n = qemu_chr_fe_read_all(&tpm_emu->ctrl_chr,
                             (uint8_t *)&pss, sizeof(pss.u.resp));
    if (n != sizeof(pss.u.resp)) {
        error_report("tpm-emulator: Reading response from writing stateblob "
                     "(type %d) failed; expected %zu bytes, got %zd", type,
                     sizeof(pss.u.resp), n);
        return -1;
    }

    tpm_result = be32_to_cpu(pss.u.resp.tpm_result);
    if (tpm_result != 0) {
        error_report("tpm-emulator: Setting the stateblob (type %d) failed "
                     "with a TPM error 0x%x %s", type, tpm_result,
                     tpm_emulator_strerror(tpm_result));
        return -1;
    }

    trace_tpm_emulator_set_state_blob(type, tsb->size, flags);

    return 0;
}

/*
 * Set all the TPM state blobs.
 *
 * Returns a negative errno code in case of error.
 */
static int tpm_emulator_set_state_blobs(TPMBackend *tb)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
    TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;

    trace_tpm_emulator_set_state_blobs();

    if (tpm_emulator_stop_tpm(tb) < 0) {
        trace_tpm_emulator_set_state_blobs_error("Could not stop TPM");
        return -EIO;
    }

    if (tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_PERMANENT,
                                    &state_blobs->permanent,
                                    state_blobs->permanent_flags) < 0 ||
        tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_VOLATILE,
                                    &state_blobs->volatil,
                                    state_blobs->volatil_flags) < 0 ||
        tpm_emulator_set_state_blob(tpm_emu, PTM_BLOB_TYPE_SAVESTATE,
                                    &state_blobs->savestate,
                                    state_blobs->savestate_flags) < 0) {
        return -EIO;
    }

    trace_tpm_emulator_set_state_blobs_done();

    return 0;
}

static int tpm_emulator_pre_save(void *opaque)
{
    TPMBackend *tb = opaque;
    TPMEmulator *tpm_emu = TPM_EMULATOR(tb);

    trace_tpm_emulator_pre_save();

    tpm_backend_finish_sync(tb);

    /* get the state blobs from the TPM */
    return tpm_emulator_get_state_blobs(tpm_emu);
}

/*
 * Load the TPM state blobs into the TPM.
 *
 * Returns negative errno codes in case of error.
 */
static int tpm_emulator_post_load(void *opaque, int version_id)
{
    TPMBackend *tb = opaque;
    int ret;

    ret = tpm_emulator_set_state_blobs(tb);
    if (ret < 0) {
        return ret;
    }

    if (tpm_emulator_startup_tpm_resume(tb, 0, true) < 0) {
        return -EIO;
    }

    return 0;
}

static const VMStateDescription vmstate_tpm_emulator = {
    .name = "tpm-emulator",
    .version_id = 0,
    .pre_save = tpm_emulator_pre_save,
    .post_load = tpm_emulator_post_load,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(state_blobs.permanent_flags, TPMEmulator),
        VMSTATE_UINT32(state_blobs.permanent.size, TPMEmulator),
        VMSTATE_VBUFFER_ALLOC_UINT32(state_blobs.permanent.buffer,
                                     TPMEmulator, 0, 0,
                                     state_blobs.permanent.size),

        VMSTATE_UINT32(state_blobs.volatil_flags, TPMEmulator),
        VMSTATE_UINT32(state_blobs.volatil.size, TPMEmulator),
        VMSTATE_VBUFFER_ALLOC_UINT32(state_blobs.volatil.buffer,
                                     TPMEmulator, 0, 0,
                                     state_blobs.volatil.size),

        VMSTATE_UINT32(state_blobs.savestate_flags, TPMEmulator),
        VMSTATE_UINT32(state_blobs.savestate.size, TPMEmulator),
        VMSTATE_VBUFFER_ALLOC_UINT32(state_blobs.savestate.buffer,
                                     TPMEmulator, 0, 0,
                                     state_blobs.savestate.size),

        VMSTATE_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);

    vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY,
                     &vmstate_tpm_emulator, obj);
}

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

    if (!tpm_emu->options->chardev) {
        /* was never properly initialized */
        return;
    }

    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 shutdown: 0x%x %s",
                     be32_to_cpu(res), tpm_emulator_strerror(be32_to_cpu(res)));
    }
}

static void tpm_emulator_inst_finalize(Object *obj)
{
    TPMEmulator *tpm_emu = TPM_EMULATOR(obj);
    TPMBlobBuffers *state_blobs = &tpm_emu->state_blobs;

    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);
    }

    tpm_sized_buffer_reset(&state_blobs->volatil);
    tpm_sized_buffer_reset(&state_blobs->permanent);
    tpm_sized_buffer_reset(&state_blobs->savestate);

    qemu_mutex_destroy(&tpm_emu->mutex);

    vmstate_unregister(NULL, &vmstate_tpm_emulator, obj);
}

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)