summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/ccp/sev-dev.c
blob: 896f190b9a502562557f9575c6d3f585eacdc794 (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
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
// SPDX-License-Identifier: GPL-2.0-only
/*
 * AMD Secure Encrypted Virtualization (SEV) interface
 *
 * Copyright (C) 2016,2019 Advanced Micro Devices, Inc.
 *
 * Author: Brijesh Singh <brijesh.singh@amd.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/hw_random.h>
#include <linux/ccp.h>
#include <linux/firmware.h>

#include <asm/smp.h>

#include "psp-dev.h"
#include "sev-dev.h"

#define DEVICE_NAME		"sev"
#define SEV_FW_FILE		"amd/sev.fw"
#define SEV_FW_NAME_SIZE	64

static DEFINE_MUTEX(sev_cmd_mutex);
static struct sev_misc_dev *misc_dev;

static int psp_cmd_timeout = 100;
module_param(psp_cmd_timeout, int, 0644);
MODULE_PARM_DESC(psp_cmd_timeout, " default timeout value, in seconds, for PSP commands");

static int psp_probe_timeout = 5;
module_param(psp_probe_timeout, int, 0644);
MODULE_PARM_DESC(psp_probe_timeout, " default timeout value, in seconds, during PSP device probe");

static bool psp_dead;
static int psp_timeout;

static inline bool sev_version_greater_or_equal(u8 maj, u8 min)
{
	struct sev_device *sev = psp_master->sev_data;

	if (sev->api_major > maj)
		return true;

	if (sev->api_major == maj && sev->api_minor >= min)
		return true;

	return false;
}

static void sev_irq_handler(int irq, void *data, unsigned int status)
{
	struct sev_device *sev = data;
	int reg;

	/* Check if it is command completion: */
	if (!(status & SEV_CMD_COMPLETE))
		return;

	/* Check if it is SEV command completion: */
	reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);
	if (reg & PSP_CMDRESP_RESP) {
		sev->int_rcvd = 1;
		wake_up(&sev->int_queue);
	}
}

static int sev_wait_cmd_ioc(struct sev_device *sev,
			    unsigned int *reg, unsigned int timeout)
{
	int ret;

	ret = wait_event_timeout(sev->int_queue,
			sev->int_rcvd, timeout * HZ);
	if (!ret)
		return -ETIMEDOUT;

	*reg = ioread32(sev->io_regs + sev->vdata->cmdresp_reg);

	return 0;
}

static int sev_cmd_buffer_len(int cmd)
{
	switch (cmd) {
	case SEV_CMD_INIT:			return sizeof(struct sev_data_init);
	case SEV_CMD_PLATFORM_STATUS:		return sizeof(struct sev_user_data_status);
	case SEV_CMD_PEK_CSR:			return sizeof(struct sev_data_pek_csr);
	case SEV_CMD_PEK_CERT_IMPORT:		return sizeof(struct sev_data_pek_cert_import);
	case SEV_CMD_PDH_CERT_EXPORT:		return sizeof(struct sev_data_pdh_cert_export);
	case SEV_CMD_LAUNCH_START:		return sizeof(struct sev_data_launch_start);
	case SEV_CMD_LAUNCH_UPDATE_DATA:	return sizeof(struct sev_data_launch_update_data);
	case SEV_CMD_LAUNCH_UPDATE_VMSA:	return sizeof(struct sev_data_launch_update_vmsa);
	case SEV_CMD_LAUNCH_FINISH:		return sizeof(struct sev_data_launch_finish);
	case SEV_CMD_LAUNCH_MEASURE:		return sizeof(struct sev_data_launch_measure);
	case SEV_CMD_ACTIVATE:			return sizeof(struct sev_data_activate);
	case SEV_CMD_DEACTIVATE:		return sizeof(struct sev_data_deactivate);
	case SEV_CMD_DECOMMISSION:		return sizeof(struct sev_data_decommission);
	case SEV_CMD_GUEST_STATUS:		return sizeof(struct sev_data_guest_status);
	case SEV_CMD_DBG_DECRYPT:		return sizeof(struct sev_data_dbg);
	case SEV_CMD_DBG_ENCRYPT:		return sizeof(struct sev_data_dbg);
	case SEV_CMD_SEND_START:		return sizeof(struct sev_data_send_start);
	case SEV_CMD_SEND_UPDATE_DATA:		return sizeof(struct sev_data_send_update_data);
	case SEV_CMD_SEND_UPDATE_VMSA:		return sizeof(struct sev_data_send_update_vmsa);
	case SEV_CMD_SEND_FINISH:		return sizeof(struct sev_data_send_finish);
	case SEV_CMD_RECEIVE_START:		return sizeof(struct sev_data_receive_start);
	case SEV_CMD_RECEIVE_FINISH:		return sizeof(struct sev_data_receive_finish);
	case SEV_CMD_RECEIVE_UPDATE_DATA:	return sizeof(struct sev_data_receive_update_data);
	case SEV_CMD_RECEIVE_UPDATE_VMSA:	return sizeof(struct sev_data_receive_update_vmsa);
	case SEV_CMD_LAUNCH_UPDATE_SECRET:	return sizeof(struct sev_data_launch_secret);
	case SEV_CMD_DOWNLOAD_FIRMWARE:		return sizeof(struct sev_data_download_firmware);
	case SEV_CMD_GET_ID:			return sizeof(struct sev_data_get_id);
	default:				return 0;
	}

	return 0;
}

static int __sev_do_cmd_locked(int cmd, void *data, int *psp_ret)
{
	struct psp_device *psp = psp_master;
	struct sev_device *sev;
	unsigned int phys_lsb, phys_msb;
	unsigned int reg, ret = 0;

	if (!psp || !psp->sev_data)
		return -ENODEV;

	if (psp_dead)
		return -EBUSY;

	sev = psp->sev_data;

	/* Get the physical address of the command buffer */
	phys_lsb = data ? lower_32_bits(__psp_pa(data)) : 0;
	phys_msb = data ? upper_32_bits(__psp_pa(data)) : 0;

	dev_dbg(sev->dev, "sev command id %#x buffer 0x%08x%08x timeout %us\n",
		cmd, phys_msb, phys_lsb, psp_timeout);

	print_hex_dump_debug("(in):  ", DUMP_PREFIX_OFFSET, 16, 2, data,
			     sev_cmd_buffer_len(cmd), false);

	iowrite32(phys_lsb, sev->io_regs + sev->vdata->cmdbuff_addr_lo_reg);
	iowrite32(phys_msb, sev->io_regs + sev->vdata->cmdbuff_addr_hi_reg);

	sev->int_rcvd = 0;

	reg = cmd;
	reg <<= SEV_CMDRESP_CMD_SHIFT;
	reg |= SEV_CMDRESP_IOC;
	iowrite32(reg, sev->io_regs + sev->vdata->cmdresp_reg);

	/* wait for command completion */
	ret = sev_wait_cmd_ioc(sev, &reg, psp_timeout);
	if (ret) {
		if (psp_ret)
			*psp_ret = 0;

		dev_err(sev->dev, "sev command %#x timed out, disabling PSP\n", cmd);
		psp_dead = true;

		return ret;
	}

	psp_timeout = psp_cmd_timeout;

	if (psp_ret)
		*psp_ret = reg & PSP_CMDRESP_ERR_MASK;

	if (reg & PSP_CMDRESP_ERR_MASK) {
		dev_dbg(sev->dev, "sev command %#x failed (%#010x)\n",
			cmd, reg & PSP_CMDRESP_ERR_MASK);
		ret = -EIO;
	}

	print_hex_dump_debug("(out): ", DUMP_PREFIX_OFFSET, 16, 2, data,
			     sev_cmd_buffer_len(cmd), false);

	return ret;
}

static int sev_do_cmd(int cmd, void *data, int *psp_ret)
{
	int rc;

	mutex_lock(&sev_cmd_mutex);
	rc = __sev_do_cmd_locked(cmd, data, psp_ret);
	mutex_unlock(&sev_cmd_mutex);

	return rc;
}

static int __sev_platform_init_locked(int *error)
{
	struct psp_device *psp = psp_master;
	struct sev_device *sev;
	int rc = 0;

	if (!psp || !psp->sev_data)
		return -ENODEV;

	sev = psp->sev_data;

	if (sev->state == SEV_STATE_INIT)
		return 0;

	rc = __sev_do_cmd_locked(SEV_CMD_INIT, &sev->init_cmd_buf, error);
	if (rc)
		return rc;

	sev->state = SEV_STATE_INIT;

	/* Prepare for first SEV guest launch after INIT */
	wbinvd_on_all_cpus();
	rc = __sev_do_cmd_locked(SEV_CMD_DF_FLUSH, NULL, error);
	if (rc)
		return rc;

	dev_dbg(sev->dev, "SEV firmware initialized\n");

	return rc;
}

int sev_platform_init(int *error)
{
	int rc;

	mutex_lock(&sev_cmd_mutex);
	rc = __sev_platform_init_locked(error);
	mutex_unlock(&sev_cmd_mutex);

	return rc;
}
EXPORT_SYMBOL_GPL(sev_platform_init);

static int __sev_platform_shutdown_locked(int *error)
{
	struct sev_device *sev = psp_master->sev_data;
	int ret;

	ret = __sev_do_cmd_locked(SEV_CMD_SHUTDOWN, NULL, error);
	if (ret)
		return ret;

	sev->state = SEV_STATE_UNINIT;
	dev_dbg(sev->dev, "SEV firmware shutdown\n");

	return ret;
}

static int sev_platform_shutdown(int *error)
{
	int rc;

	mutex_lock(&sev_cmd_mutex);
	rc = __sev_platform_shutdown_locked(NULL);
	mutex_unlock(&sev_cmd_mutex);

	return rc;
}

static int sev_get_platform_state(int *state, int *error)
{
	struct sev_device *sev = psp_master->sev_data;
	int rc;

	rc = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS,
				 &sev->status_cmd_buf, error);
	if (rc)
		return rc;

	*state = sev->status_cmd_buf.state;
	return rc;
}

static int sev_ioctl_do_reset(struct sev_issue_cmd *argp, bool writable)
{
	int state, rc;

	if (!writable)
		return -EPERM;

	/*
	 * The SEV spec requires that FACTORY_RESET must be issued in
	 * UNINIT state. Before we go further lets check if any guest is
	 * active.
	 *
	 * If FW is in WORKING state then deny the request otherwise issue
	 * SHUTDOWN command do INIT -> UNINIT before issuing the FACTORY_RESET.
	 *
	 */
	rc = sev_get_platform_state(&state, &argp->error);
	if (rc)
		return rc;

	if (state == SEV_STATE_WORKING)
		return -EBUSY;

	if (state == SEV_STATE_INIT) {
		rc = __sev_platform_shutdown_locked(&argp->error);
		if (rc)
			return rc;
	}

	return __sev_do_cmd_locked(SEV_CMD_FACTORY_RESET, NULL, &argp->error);
}

static int sev_ioctl_do_platform_status(struct sev_issue_cmd *argp)
{
	struct sev_device *sev = psp_master->sev_data;
	struct sev_user_data_status *data = &sev->status_cmd_buf;
	int ret;

	ret = __sev_do_cmd_locked(SEV_CMD_PLATFORM_STATUS, data, &argp->error);
	if (ret)
		return ret;

	if (copy_to_user((void __user *)argp->data, data, sizeof(*data)))
		ret = -EFAULT;

	return ret;
}

static int sev_ioctl_do_pek_pdh_gen(int cmd, struct sev_issue_cmd *argp, bool writable)
{
	struct sev_device *sev = psp_master->sev_data;
	int rc;

	if (!writable)
		return -EPERM;

	if (sev->state == SEV_STATE_UNINIT) {
		rc = __sev_platform_init_locked(&argp->error);
		if (rc)
			return rc;
	}

	return __sev_do_cmd_locked(cmd, NULL, &argp->error);
}

static int sev_ioctl_do_pek_csr(struct sev_issue_cmd *argp, bool writable)
{
	struct sev_device *sev = psp_master->sev_data;
	struct sev_user_data_pek_csr input;
	struct sev_data_pek_csr *data;
	void *blob = NULL;
	int ret;

	if (!writable)
		return -EPERM;

	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
		return -EFAULT;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* userspace wants to query CSR length */
	if (!input.address || !input.length)
		goto cmd;

	/* allocate a physically contiguous buffer to store the CSR blob */
	if (!access_ok(input.address, input.length) ||
	    input.length > SEV_FW_BLOB_MAX_SIZE) {
		ret = -EFAULT;
		goto e_free;
	}

	blob = kmalloc(input.length, GFP_KERNEL);
	if (!blob) {
		ret = -ENOMEM;
		goto e_free;
	}

	data->address = __psp_pa(blob);
	data->len = input.length;

cmd:
	if (sev->state == SEV_STATE_UNINIT) {
		ret = __sev_platform_init_locked(&argp->error);
		if (ret)
			goto e_free_blob;
	}

	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CSR, data, &argp->error);

	 /* If we query the CSR length, FW responded with expected data. */
	input.length = data->len;

	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
		ret = -EFAULT;
		goto e_free_blob;
	}

	if (blob) {
		if (copy_to_user((void __user *)input.address, blob, input.length))
			ret = -EFAULT;
	}

e_free_blob:
	kfree(blob);
e_free:
	kfree(data);
	return ret;
}

void *psp_copy_user_blob(u64 __user uaddr, u32 len)
{
	if (!uaddr || !len)
		return ERR_PTR(-EINVAL);

	/* verify that blob length does not exceed our limit */
	if (len > SEV_FW_BLOB_MAX_SIZE)
		return ERR_PTR(-EINVAL);

	return memdup_user((void __user *)(uintptr_t)uaddr, len);
}
EXPORT_SYMBOL_GPL(psp_copy_user_blob);

static int sev_get_api_version(void)
{
	struct sev_device *sev = psp_master->sev_data;
	struct sev_user_data_status *status;
	int error = 0, ret;

	status = &sev->status_cmd_buf;
	ret = sev_platform_status(status, &error);
	if (ret) {
		dev_err(sev->dev,
			"SEV: failed to get status. Error: %#x\n", error);
		return 1;
	}

	sev->api_major = status->api_major;
	sev->api_minor = status->api_minor;
	sev->build = status->build;
	sev->state = status->state;

	return 0;
}

static int sev_get_firmware(struct device *dev,
			    const struct firmware **firmware)
{
	char fw_name_specific[SEV_FW_NAME_SIZE];
	char fw_name_subset[SEV_FW_NAME_SIZE];

	snprintf(fw_name_specific, sizeof(fw_name_specific),
		 "amd/amd_sev_fam%.2xh_model%.2xh.sbin",
		 boot_cpu_data.x86, boot_cpu_data.x86_model);

	snprintf(fw_name_subset, sizeof(fw_name_subset),
		 "amd/amd_sev_fam%.2xh_model%.1xxh.sbin",
		 boot_cpu_data.x86, (boot_cpu_data.x86_model & 0xf0) >> 4);

	/* Check for SEV FW for a particular model.
	 * Ex. amd_sev_fam17h_model00h.sbin for Family 17h Model 00h
	 *
	 * or
	 *
	 * Check for SEV FW common to a subset of models.
	 * Ex. amd_sev_fam17h_model0xh.sbin for
	 *     Family 17h Model 00h -- Family 17h Model 0Fh
	 *
	 * or
	 *
	 * Fall-back to using generic name: sev.fw
	 */
	if ((firmware_request_nowarn(firmware, fw_name_specific, dev) >= 0) ||
	    (firmware_request_nowarn(firmware, fw_name_subset, dev) >= 0) ||
	    (firmware_request_nowarn(firmware, SEV_FW_FILE, dev) >= 0))
		return 0;

	return -ENOENT;
}

/* Don't fail if SEV FW couldn't be updated. Continue with existing SEV FW */
static int sev_update_firmware(struct device *dev)
{
	struct sev_data_download_firmware *data;
	const struct firmware *firmware;
	int ret, error, order;
	struct page *p;
	u64 data_size;

	if (sev_get_firmware(dev, &firmware) == -ENOENT) {
		dev_dbg(dev, "No SEV firmware file present\n");
		return -1;
	}

	/*
	 * SEV FW expects the physical address given to it to be 32
	 * byte aligned. Memory allocated has structure placed at the
	 * beginning followed by the firmware being passed to the SEV
	 * FW. Allocate enough memory for data structure + alignment
	 * padding + SEV FW.
	 */
	data_size = ALIGN(sizeof(struct sev_data_download_firmware), 32);

	order = get_order(firmware->size + data_size);
	p = alloc_pages(GFP_KERNEL, order);
	if (!p) {
		ret = -1;
		goto fw_err;
	}

	/*
	 * Copy firmware data to a kernel allocated contiguous
	 * memory region.
	 */
	data = page_address(p);
	memcpy(page_address(p) + data_size, firmware->data, firmware->size);

	data->address = __psp_pa(page_address(p) + data_size);
	data->len = firmware->size;

	ret = sev_do_cmd(SEV_CMD_DOWNLOAD_FIRMWARE, data, &error);
	if (ret)
		dev_dbg(dev, "Failed to update SEV firmware: %#x\n", error);
	else
		dev_info(dev, "SEV firmware update successful\n");

	__free_pages(p, order);

fw_err:
	release_firmware(firmware);

	return ret;
}

static int sev_ioctl_do_pek_import(struct sev_issue_cmd *argp, bool writable)
{
	struct sev_device *sev = psp_master->sev_data;
	struct sev_user_data_pek_cert_import input;
	struct sev_data_pek_cert_import *data;
	void *pek_blob, *oca_blob;
	int ret;

	if (!writable)
		return -EPERM;

	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
		return -EFAULT;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* copy PEK certificate blobs from userspace */
	pek_blob = psp_copy_user_blob(input.pek_cert_address, input.pek_cert_len);
	if (IS_ERR(pek_blob)) {
		ret = PTR_ERR(pek_blob);
		goto e_free;
	}

	data->pek_cert_address = __psp_pa(pek_blob);
	data->pek_cert_len = input.pek_cert_len;

	/* copy PEK certificate blobs from userspace */
	oca_blob = psp_copy_user_blob(input.oca_cert_address, input.oca_cert_len);
	if (IS_ERR(oca_blob)) {
		ret = PTR_ERR(oca_blob);
		goto e_free_pek;
	}

	data->oca_cert_address = __psp_pa(oca_blob);
	data->oca_cert_len = input.oca_cert_len;

	/* If platform is not in INIT state then transition it to INIT */
	if (sev->state != SEV_STATE_INIT) {
		ret = __sev_platform_init_locked(&argp->error);
		if (ret)
			goto e_free_oca;
	}

	ret = __sev_do_cmd_locked(SEV_CMD_PEK_CERT_IMPORT, data, &argp->error);

e_free_oca:
	kfree(oca_blob);
e_free_pek:
	kfree(pek_blob);
e_free:
	kfree(data);
	return ret;
}

static int sev_ioctl_do_get_id2(struct sev_issue_cmd *argp)
{
	struct sev_user_data_get_id2 input;
	struct sev_data_get_id *data;
	void *id_blob = NULL;
	int ret;

	/* SEV GET_ID is available from SEV API v0.16 and up */
	if (!sev_version_greater_or_equal(0, 16))
		return -ENOTSUPP;

	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
		return -EFAULT;

	/* Check if we have write access to the userspace buffer */
	if (input.address &&
	    input.length &&
	    !access_ok(input.address, input.length))
		return -EFAULT;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	if (input.address && input.length) {
		id_blob = kmalloc(input.length, GFP_KERNEL);
		if (!id_blob) {
			kfree(data);
			return -ENOMEM;
		}

		data->address = __psp_pa(id_blob);
		data->len = input.length;
	}

	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);

	/*
	 * Firmware will return the length of the ID value (either the minimum
	 * required length or the actual length written), return it to the user.
	 */
	input.length = data->len;

	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
		ret = -EFAULT;
		goto e_free;
	}

	if (id_blob) {
		if (copy_to_user((void __user *)input.address,
				 id_blob, data->len)) {
			ret = -EFAULT;
			goto e_free;
		}
	}

e_free:
	kfree(id_blob);
	kfree(data);

	return ret;
}

static int sev_ioctl_do_get_id(struct sev_issue_cmd *argp)
{
	struct sev_data_get_id *data;
	u64 data_size, user_size;
	void *id_blob, *mem;
	int ret;

	/* SEV GET_ID available from SEV API v0.16 and up */
	if (!sev_version_greater_or_equal(0, 16))
		return -ENOTSUPP;

	/* SEV FW expects the buffer it fills with the ID to be
	 * 8-byte aligned. Memory allocated should be enough to
	 * hold data structure + alignment padding + memory
	 * where SEV FW writes the ID.
	 */
	data_size = ALIGN(sizeof(struct sev_data_get_id), 8);
	user_size = sizeof(struct sev_user_data_get_id);

	mem = kzalloc(data_size + user_size, GFP_KERNEL);
	if (!mem)
		return -ENOMEM;

	data = mem;
	id_blob = mem + data_size;

	data->address = __psp_pa(id_blob);
	data->len = user_size;

	ret = __sev_do_cmd_locked(SEV_CMD_GET_ID, data, &argp->error);
	if (!ret) {
		if (copy_to_user((void __user *)argp->data, id_blob, data->len))
			ret = -EFAULT;
	}

	kfree(mem);

	return ret;
}

static int sev_ioctl_do_pdh_export(struct sev_issue_cmd *argp, bool writable)
{
	struct sev_device *sev = psp_master->sev_data;
	struct sev_user_data_pdh_cert_export input;
	void *pdh_blob = NULL, *cert_blob = NULL;
	struct sev_data_pdh_cert_export *data;
	int ret;

	/* If platform is not in INIT state then transition it to INIT. */
	if (sev->state != SEV_STATE_INIT) {
		if (!writable)
			return -EPERM;

		ret = __sev_platform_init_locked(&argp->error);
		if (ret)
			return ret;
	}

	if (copy_from_user(&input, (void __user *)argp->data, sizeof(input)))
		return -EFAULT;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	/* Userspace wants to query the certificate length. */
	if (!input.pdh_cert_address ||
	    !input.pdh_cert_len ||
	    !input.cert_chain_address)
		goto cmd;

	/* Allocate a physically contiguous buffer to store the PDH blob. */
	if ((input.pdh_cert_len > SEV_FW_BLOB_MAX_SIZE) ||
	    !access_ok(input.pdh_cert_address, input.pdh_cert_len)) {
		ret = -EFAULT;
		goto e_free;
	}

	/* Allocate a physically contiguous buffer to store the cert chain blob. */
	if ((input.cert_chain_len > SEV_FW_BLOB_MAX_SIZE) ||
	    !access_ok(input.cert_chain_address, input.cert_chain_len)) {
		ret = -EFAULT;
		goto e_free;
	}

	pdh_blob = kmalloc(input.pdh_cert_len, GFP_KERNEL);
	if (!pdh_blob) {
		ret = -ENOMEM;
		goto e_free;
	}

	data->pdh_cert_address = __psp_pa(pdh_blob);
	data->pdh_cert_len = input.pdh_cert_len;

	cert_blob = kmalloc(input.cert_chain_len, GFP_KERNEL);
	if (!cert_blob) {
		ret = -ENOMEM;
		goto e_free_pdh;
	}

	data->cert_chain_address = __psp_pa(cert_blob);
	data->cert_chain_len = input.cert_chain_len;

cmd:
	ret = __sev_do_cmd_locked(SEV_CMD_PDH_CERT_EXPORT, data, &argp->error);

	/* If we query the length, FW responded with expected data. */
	input.cert_chain_len = data->cert_chain_len;
	input.pdh_cert_len = data->pdh_cert_len;

	if (copy_to_user((void __user *)argp->data, &input, sizeof(input))) {
		ret = -EFAULT;
		goto e_free_cert;
	}

	if (pdh_blob) {
		if (copy_to_user((void __user *)input.pdh_cert_address,
				 pdh_blob, input.pdh_cert_len)) {
			ret = -EFAULT;
			goto e_free_cert;
		}
	}

	if (cert_blob) {
		if (copy_to_user((void __user *)input.cert_chain_address,
				 cert_blob, input.cert_chain_len))
			ret = -EFAULT;
	}

e_free_cert:
	kfree(cert_blob);
e_free_pdh:
	kfree(pdh_blob);
e_free:
	kfree(data);
	return ret;
}

static long sev_ioctl(struct file *file, unsigned int ioctl, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct sev_issue_cmd input;
	int ret = -EFAULT;
	bool writable = file->f_mode & FMODE_WRITE;

	if (!psp_master || !psp_master->sev_data)
		return -ENODEV;

	if (ioctl != SEV_ISSUE_CMD)
		return -EINVAL;

	if (copy_from_user(&input, argp, sizeof(struct sev_issue_cmd)))
		return -EFAULT;

	if (input.cmd > SEV_MAX)
		return -EINVAL;

	mutex_lock(&sev_cmd_mutex);

	switch (input.cmd) {

	case SEV_FACTORY_RESET:
		ret = sev_ioctl_do_reset(&input, writable);
		break;
	case SEV_PLATFORM_STATUS:
		ret = sev_ioctl_do_platform_status(&input);
		break;
	case SEV_PEK_GEN:
		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PEK_GEN, &input, writable);
		break;
	case SEV_PDH_GEN:
		ret = sev_ioctl_do_pek_pdh_gen(SEV_CMD_PDH_GEN, &input, writable);
		break;
	case SEV_PEK_CSR:
		ret = sev_ioctl_do_pek_csr(&input, writable);
		break;
	case SEV_PEK_CERT_IMPORT:
		ret = sev_ioctl_do_pek_import(&input, writable);
		break;
	case SEV_PDH_CERT_EXPORT:
		ret = sev_ioctl_do_pdh_export(&input, writable);
		break;
	case SEV_GET_ID:
		pr_warn_once("SEV_GET_ID command is deprecated, use SEV_GET_ID2\n");
		ret = sev_ioctl_do_get_id(&input);
		break;
	case SEV_GET_ID2:
		ret = sev_ioctl_do_get_id2(&input);
		break;
	default:
		ret = -EINVAL;
		goto out;
	}

	if (copy_to_user(argp, &input, sizeof(struct sev_issue_cmd)))
		ret = -EFAULT;
out:
	mutex_unlock(&sev_cmd_mutex);

	return ret;
}

static const struct file_operations sev_fops = {
	.owner	= THIS_MODULE,
	.unlocked_ioctl = sev_ioctl,
};

int sev_platform_status(struct sev_user_data_status *data, int *error)
{
	return sev_do_cmd(SEV_CMD_PLATFORM_STATUS, data, error);
}
EXPORT_SYMBOL_GPL(sev_platform_status);

int sev_guest_deactivate(struct sev_data_deactivate *data, int *error)
{
	return sev_do_cmd(SEV_CMD_DEACTIVATE, data, error);
}
EXPORT_SYMBOL_GPL(sev_guest_deactivate);

int sev_guest_activate(struct sev_data_activate *data, int *error)
{
	return sev_do_cmd(SEV_CMD_ACTIVATE, data, error);
}
EXPORT_SYMBOL_GPL(sev_guest_activate);

int sev_guest_decommission(struct sev_data_decommission *data, int *error)
{
	return sev_do_cmd(SEV_CMD_DECOMMISSION, data, error);
}
EXPORT_SYMBOL_GPL(sev_guest_decommission);

int sev_guest_df_flush(int *error)
{
	return sev_do_cmd(SEV_CMD_DF_FLUSH, NULL, error);
}
EXPORT_SYMBOL_GPL(sev_guest_df_flush);

static void sev_exit(struct kref *ref)
{
	misc_deregister(&misc_dev->misc);
	kfree(misc_dev);
	misc_dev = NULL;
}

static int sev_misc_init(struct sev_device *sev)
{
	struct device *dev = sev->dev;
	int ret;

	/*
	 * SEV feature support can be detected on multiple devices but the SEV
	 * FW commands must be issued on the master. During probe, we do not
	 * know the master hence we create /dev/sev on the first device probe.
	 * sev_do_cmd() finds the right master device to which to issue the
	 * command to the firmware.
	 */
	if (!misc_dev) {
		struct miscdevice *misc;

		misc_dev = kzalloc(sizeof(*misc_dev), GFP_KERNEL);
		if (!misc_dev)
			return -ENOMEM;

		misc = &misc_dev->misc;
		misc->minor = MISC_DYNAMIC_MINOR;
		misc->name = DEVICE_NAME;
		misc->fops = &sev_fops;

		ret = misc_register(misc);
		if (ret)
			return ret;

		kref_init(&misc_dev->refcount);
	} else {
		kref_get(&misc_dev->refcount);
	}

	init_waitqueue_head(&sev->int_queue);
	sev->misc = misc_dev;
	dev_dbg(dev, "registered SEV device\n");

	return 0;
}

int sev_dev_init(struct psp_device *psp)
{
	struct device *dev = psp->dev;
	struct sev_device *sev;
	int ret = -ENOMEM;

	sev = devm_kzalloc(dev, sizeof(*sev), GFP_KERNEL);
	if (!sev)
		goto e_err;

	psp->sev_data = sev;

	sev->dev = dev;
	sev->psp = psp;

	sev->io_regs = psp->io_regs;

	sev->vdata = (struct sev_vdata *)psp->vdata->sev;
	if (!sev->vdata) {
		ret = -ENODEV;
		dev_err(dev, "sev: missing driver data\n");
		goto e_err;
	}

	psp_set_sev_irq_handler(psp, sev_irq_handler, sev);

	ret = sev_misc_init(sev);
	if (ret)
		goto e_irq;

	dev_notice(dev, "sev enabled\n");

	return 0;

e_irq:
	psp_clear_sev_irq_handler(psp);
e_err:
	psp->sev_data = NULL;

	dev_notice(dev, "sev initialization failed\n");

	return ret;
}

void sev_dev_destroy(struct psp_device *psp)
{
	struct sev_device *sev = psp->sev_data;

	if (!sev)
		return;

	if (sev->misc)
		kref_put(&misc_dev->refcount, sev_exit);

	psp_clear_sev_irq_handler(psp);
}

int sev_issue_cmd_external_user(struct file *filep, unsigned int cmd,
				void *data, int *error)
{
	if (!filep || filep->f_op != &sev_fops)
		return -EBADF;

	return sev_do_cmd(cmd, data, error);
}
EXPORT_SYMBOL_GPL(sev_issue_cmd_external_user);

void sev_pci_init(void)
{
	struct sev_device *sev = psp_master->sev_data;
	int error, rc;

	if (!sev)
		return;

	psp_timeout = psp_probe_timeout;

	if (sev_get_api_version())
		goto err;

	/*
	 * If platform is not in UNINIT state then firmware upgrade and/or
	 * platform INIT command will fail. These command require UNINIT state.
	 *
	 * In a normal boot we should never run into case where the firmware
	 * is not in UNINIT state on boot. But in case of kexec boot, a reboot
	 * may not go through a typical shutdown sequence and may leave the
	 * firmware in INIT or WORKING state.
	 */

	if (sev->state != SEV_STATE_UNINIT) {
		sev_platform_shutdown(NULL);
		sev->state = SEV_STATE_UNINIT;
	}

	if (sev_version_greater_or_equal(0, 15) &&
	    sev_update_firmware(sev->dev) == 0)
		sev_get_api_version();

	/* Initialize the platform */
	rc = sev_platform_init(&error);
	if (rc && (error == SEV_RET_SECURE_DATA_INVALID)) {
		/*
		 * INIT command returned an integrity check failure
		 * status code, meaning that firmware load and
		 * validation of SEV related persistent data has
		 * failed and persistent state has been erased.
		 * Retrying INIT command here should succeed.
		 */
		dev_dbg(sev->dev, "SEV: retrying INIT command");
		rc = sev_platform_init(&error);
	}

	if (rc) {
		dev_err(sev->dev, "SEV: failed to INIT error %#x\n", error);
		return;
	}

	dev_info(sev->dev, "SEV API:%d.%d build:%d\n", sev->api_major,
		 sev->api_minor, sev->build);

	return;

err:
	psp_master->sev_data = NULL;
}

void sev_pci_exit(void)
{
	if (!psp_master->sev_data)
		return;

	sev_platform_shutdown(NULL);
}