summaryrefslogtreecommitdiff
path: root/arch/arm64/kernel/cpu_errata.c
blob: e88d4e7bdfc71c0a054f730e6722ae741a761b8e (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
/*
 * Contains CPU specific errata definitions
 *
 * Copyright (C) 2014 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/arm-smccc.h>
#include <linux/psci.h>
#include <linux/types.h>
#include <linux/cpu.h>
#include <asm/cpu.h>
#include <asm/cputype.h>
#include <asm/cpufeature.h>

static bool __maybe_unused
is_affected_midr_range(const struct arm64_cpu_capabilities *entry, int scope)
{
	const struct arm64_midr_revidr *fix;
	u32 midr = read_cpuid_id(), revidr;

	WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
	if (!is_midr_in_range(midr, &entry->midr_range))
		return false;

	midr &= MIDR_REVISION_MASK | MIDR_VARIANT_MASK;
	revidr = read_cpuid(REVIDR_EL1);
	for (fix = entry->fixed_revs; fix && fix->revidr_mask; fix++)
		if (midr == fix->midr_rv && (revidr & fix->revidr_mask))
			return false;

	return true;
}

static bool __maybe_unused
is_affected_midr_range_list(const struct arm64_cpu_capabilities *entry,
			    int scope)
{
	WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());
	return is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list);
}

static bool __maybe_unused
is_kryo_midr(const struct arm64_cpu_capabilities *entry, int scope)
{
	u32 model;

	WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());

	model = read_cpuid_id();
	model &= MIDR_IMPLEMENTOR_MASK | (0xf00 << MIDR_PARTNUM_SHIFT) |
		 MIDR_ARCHITECTURE_MASK;

	return model == entry->midr_range.model;
}

static bool
has_mismatched_cache_type(const struct arm64_cpu_capabilities *entry,
			  int scope)
{
	u64 mask = arm64_ftr_reg_ctrel0.strict_mask;
	u64 sys = arm64_ftr_reg_ctrel0.sys_val & mask;
	u64 ctr_raw, ctr_real;

	WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());

	/*
	 * We want to make sure that all the CPUs in the system expose
	 * a consistent CTR_EL0 to make sure that applications behaves
	 * correctly with migration.
	 *
	 * If a CPU has CTR_EL0.IDC but does not advertise it via CTR_EL0 :
	 *
	 * 1) It is safe if the system doesn't support IDC, as CPU anyway
	 *    reports IDC = 0, consistent with the rest.
	 *
	 * 2) If the system has IDC, it is still safe as we trap CTR_EL0
	 *    access on this CPU via the ARM64_HAS_CACHE_IDC capability.
	 *
	 * So, we need to make sure either the raw CTR_EL0 or the effective
	 * CTR_EL0 matches the system's copy to allow a secondary CPU to boot.
	 */
	ctr_raw = read_cpuid_cachetype() & mask;
	ctr_real = read_cpuid_effective_cachetype() & mask;

	return (ctr_real != sys) && (ctr_raw != sys);
}

static void
cpu_enable_trap_ctr_access(const struct arm64_cpu_capabilities *__unused)
{
	u64 mask = arm64_ftr_reg_ctrel0.strict_mask;

	/* Trap CTR_EL0 access on this CPU, only if it has a mismatch */
	if ((read_cpuid_cachetype() & mask) !=
	    (arm64_ftr_reg_ctrel0.sys_val & mask))
		sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCT, 0);
}

atomic_t arm64_el2_vector_last_slot = ATOMIC_INIT(-1);

#include <asm/mmu_context.h>
#include <asm/cacheflush.h>

DEFINE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);

#ifdef CONFIG_KVM_INDIRECT_VECTORS
extern char __smccc_workaround_1_smc_start[];
extern char __smccc_workaround_1_smc_end[];

static void __copy_hyp_vect_bpi(int slot, const char *hyp_vecs_start,
				const char *hyp_vecs_end)
{
	void *dst = lm_alias(__bp_harden_hyp_vecs_start + slot * SZ_2K);
	int i;

	for (i = 0; i < SZ_2K; i += 0x80)
		memcpy(dst + i, hyp_vecs_start, hyp_vecs_end - hyp_vecs_start);

	__flush_icache_range((uintptr_t)dst, (uintptr_t)dst + SZ_2K);
}

static void install_bp_hardening_cb(bp_hardening_cb_t fn,
				    const char *hyp_vecs_start,
				    const char *hyp_vecs_end)
{
	static DEFINE_RAW_SPINLOCK(bp_lock);
	int cpu, slot = -1;

	/*
	 * enable_smccc_arch_workaround_1() passes NULL for the hyp_vecs
	 * start/end if we're a guest. Skip the hyp-vectors work.
	 */
	if (!hyp_vecs_start) {
		__this_cpu_write(bp_hardening_data.fn, fn);
		return;
	}

	raw_spin_lock(&bp_lock);
	for_each_possible_cpu(cpu) {
		if (per_cpu(bp_hardening_data.fn, cpu) == fn) {
			slot = per_cpu(bp_hardening_data.hyp_vectors_slot, cpu);
			break;
		}
	}

	if (slot == -1) {
		slot = atomic_inc_return(&arm64_el2_vector_last_slot);
		BUG_ON(slot >= BP_HARDEN_EL2_SLOTS);
		__copy_hyp_vect_bpi(slot, hyp_vecs_start, hyp_vecs_end);
	}

	__this_cpu_write(bp_hardening_data.hyp_vectors_slot, slot);
	__this_cpu_write(bp_hardening_data.fn, fn);
	raw_spin_unlock(&bp_lock);
}
#else
#define __smccc_workaround_1_smc_start		NULL
#define __smccc_workaround_1_smc_end		NULL

static void install_bp_hardening_cb(bp_hardening_cb_t fn,
				      const char *hyp_vecs_start,
				      const char *hyp_vecs_end)
{
	__this_cpu_write(bp_hardening_data.fn, fn);
}
#endif	/* CONFIG_KVM_INDIRECT_VECTORS */

#include <uapi/linux/psci.h>
#include <linux/arm-smccc.h>
#include <linux/psci.h>

static void call_smc_arch_workaround_1(void)
{
	arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
}

static void call_hvc_arch_workaround_1(void)
{
	arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_1, NULL);
}

static void qcom_link_stack_sanitization(void)
{
	u64 tmp;

	asm volatile("mov	%0, x30		\n"
		     ".rept	16		\n"
		     "bl	. + 4		\n"
		     ".endr			\n"
		     "mov	x30, %0		\n"
		     : "=&r" (tmp));
}

static bool __nospectre_v2;
static int __init parse_nospectre_v2(char *str)
{
	__nospectre_v2 = true;
	return 0;
}
early_param("nospectre_v2", parse_nospectre_v2);

/*
 * -1: No workaround
 *  0: No workaround required
 *  1: Workaround installed
 */
static int detect_harden_bp_fw(void)
{
	bp_hardening_cb_t cb;
	void *smccc_start, *smccc_end;
	struct arm_smccc_res res;
	u32 midr = read_cpuid_id();

	if (psci_ops.smccc_version == SMCCC_VERSION_1_0)
		return -1;

	switch (psci_ops.conduit) {
	case PSCI_CONDUIT_HVC:
		arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
				  ARM_SMCCC_ARCH_WORKAROUND_1, &res);
		switch ((int)res.a0) {
		case 1:
			/* Firmware says we're just fine */
			return 0;
		case 0:
			cb = call_hvc_arch_workaround_1;
			/* This is a guest, no need to patch KVM vectors */
			smccc_start = NULL;
			smccc_end = NULL;
			break;
		default:
			return -1;
		}
		break;

	case PSCI_CONDUIT_SMC:
		arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
				  ARM_SMCCC_ARCH_WORKAROUND_1, &res);
		switch ((int)res.a0) {
		case 1:
			/* Firmware says we're just fine */
			return 0;
		case 0:
			cb = call_smc_arch_workaround_1;
			smccc_start = __smccc_workaround_1_smc_start;
			smccc_end = __smccc_workaround_1_smc_end;
			break;
		default:
			return -1;
		}
		break;

	default:
		return -1;
	}

	if (((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR) ||
	    ((midr & MIDR_CPU_MODEL_MASK) == MIDR_QCOM_FALKOR_V1))
		cb = qcom_link_stack_sanitization;

	if (IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR))
		install_bp_hardening_cb(cb, smccc_start, smccc_end);

	return 1;
}

DEFINE_PER_CPU_READ_MOSTLY(u64, arm64_ssbd_callback_required);

int ssbd_state __read_mostly = ARM64_SSBD_KERNEL;
static bool __ssb_safe = true;

static const struct ssbd_options {
	const char	*str;
	int		state;
} ssbd_options[] = {
	{ "force-on",	ARM64_SSBD_FORCE_ENABLE, },
	{ "force-off",	ARM64_SSBD_FORCE_DISABLE, },
	{ "kernel",	ARM64_SSBD_KERNEL, },
};

static int __init ssbd_cfg(char *buf)
{
	int i;

	if (!buf || !buf[0])
		return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(ssbd_options); i++) {
		int len = strlen(ssbd_options[i].str);

		if (strncmp(buf, ssbd_options[i].str, len))
			continue;

		ssbd_state = ssbd_options[i].state;
		return 0;
	}

	return -EINVAL;
}
early_param("ssbd", ssbd_cfg);

void __init arm64_update_smccc_conduit(struct alt_instr *alt,
				       __le32 *origptr, __le32 *updptr,
				       int nr_inst)
{
	u32 insn;

	BUG_ON(nr_inst != 1);

	switch (psci_ops.conduit) {
	case PSCI_CONDUIT_HVC:
		insn = aarch64_insn_get_hvc_value();
		break;
	case PSCI_CONDUIT_SMC:
		insn = aarch64_insn_get_smc_value();
		break;
	default:
		return;
	}

	*updptr = cpu_to_le32(insn);
}

void __init arm64_enable_wa2_handling(struct alt_instr *alt,
				      __le32 *origptr, __le32 *updptr,
				      int nr_inst)
{
	BUG_ON(nr_inst != 1);
	/*
	 * Only allow mitigation on EL1 entry/exit and guest
	 * ARCH_WORKAROUND_2 handling if the SSBD state allows it to
	 * be flipped.
	 */
	if (arm64_get_ssbd_state() == ARM64_SSBD_KERNEL)
		*updptr = cpu_to_le32(aarch64_insn_gen_nop());
}

void arm64_set_ssbd_mitigation(bool state)
{
	if (!IS_ENABLED(CONFIG_ARM64_SSBD)) {
		pr_info_once("SSBD disabled by kernel configuration\n");
		return;
	}

	if (this_cpu_has_cap(ARM64_SSBS)) {
		if (state)
			asm volatile(SET_PSTATE_SSBS(0));
		else
			asm volatile(SET_PSTATE_SSBS(1));
		return;
	}

	switch (psci_ops.conduit) {
	case PSCI_CONDUIT_HVC:
		arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
		break;

	case PSCI_CONDUIT_SMC:
		arm_smccc_1_1_smc(ARM_SMCCC_ARCH_WORKAROUND_2, state, NULL);
		break;

	default:
		WARN_ON_ONCE(1);
		break;
	}
}

static bool has_ssbd_mitigation(const struct arm64_cpu_capabilities *entry,
				    int scope)
{
	struct arm_smccc_res res;
	bool required = true;
	s32 val;
	bool this_cpu_safe = false;

	WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());

	if (cpu_mitigations_off())
		ssbd_state = ARM64_SSBD_FORCE_DISABLE;

	/* delay setting __ssb_safe until we get a firmware response */
	if (is_midr_in_range_list(read_cpuid_id(), entry->midr_range_list))
		this_cpu_safe = true;

	if (this_cpu_has_cap(ARM64_SSBS)) {
		if (!this_cpu_safe)
			__ssb_safe = false;
		required = false;
		goto out_printmsg;
	}

	if (psci_ops.smccc_version == SMCCC_VERSION_1_0) {
		ssbd_state = ARM64_SSBD_UNKNOWN;
		if (!this_cpu_safe)
			__ssb_safe = false;
		return false;
	}

	switch (psci_ops.conduit) {
	case PSCI_CONDUIT_HVC:
		arm_smccc_1_1_hvc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
				  ARM_SMCCC_ARCH_WORKAROUND_2, &res);
		break;

	case PSCI_CONDUIT_SMC:
		arm_smccc_1_1_smc(ARM_SMCCC_ARCH_FEATURES_FUNC_ID,
				  ARM_SMCCC_ARCH_WORKAROUND_2, &res);
		break;

	default:
		ssbd_state = ARM64_SSBD_UNKNOWN;
		if (!this_cpu_safe)
			__ssb_safe = false;
		return false;
	}

	val = (s32)res.a0;

	switch (val) {
	case SMCCC_RET_NOT_SUPPORTED:
		ssbd_state = ARM64_SSBD_UNKNOWN;
		if (!this_cpu_safe)
			__ssb_safe = false;
		return false;

	/* machines with mixed mitigation requirements must not return this */
	case SMCCC_RET_NOT_REQUIRED:
		pr_info_once("%s mitigation not required\n", entry->desc);
		ssbd_state = ARM64_SSBD_MITIGATED;
		return false;

	case SMCCC_RET_SUCCESS:
		__ssb_safe = false;
		required = true;
		break;

	case 1:	/* Mitigation not required on this CPU */
		required = false;
		break;

	default:
		WARN_ON(1);
		if (!this_cpu_safe)
			__ssb_safe = false;
		return false;
	}

	switch (ssbd_state) {
	case ARM64_SSBD_FORCE_DISABLE:
		arm64_set_ssbd_mitigation(false);
		required = false;
		break;

	case ARM64_SSBD_KERNEL:
		if (required) {
			__this_cpu_write(arm64_ssbd_callback_required, 1);
			arm64_set_ssbd_mitigation(true);
		}
		break;

	case ARM64_SSBD_FORCE_ENABLE:
		arm64_set_ssbd_mitigation(true);
		required = true;
		break;

	default:
		WARN_ON(1);
		break;
	}

out_printmsg:
	switch (ssbd_state) {
	case ARM64_SSBD_FORCE_DISABLE:
		pr_info_once("%s disabled from command-line\n", entry->desc);
		break;

	case ARM64_SSBD_FORCE_ENABLE:
		pr_info_once("%s forced from command-line\n", entry->desc);
		break;
	}

	return required;
}

/* known invulnerable cores */
static const struct midr_range arm64_ssb_cpus[] = {
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
	{},
};

static void __maybe_unused
cpu_enable_cache_maint_trap(const struct arm64_cpu_capabilities *__unused)
{
	sysreg_clear_set(sctlr_el1, SCTLR_EL1_UCI, 0);
}

#define CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)	\
	.matches = is_affected_midr_range,			\
	.midr_range = MIDR_RANGE(model, v_min, r_min, v_max, r_max)

#define CAP_MIDR_ALL_VERSIONS(model)					\
	.matches = is_affected_midr_range,				\
	.midr_range = MIDR_ALL_VERSIONS(model)

#define MIDR_FIXED(rev, revidr_mask) \
	.fixed_revs = (struct arm64_midr_revidr[]){{ (rev), (revidr_mask) }, {}}

#define ERRATA_MIDR_RANGE(model, v_min, r_min, v_max, r_max)		\
	.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,				\
	CAP_MIDR_RANGE(model, v_min, r_min, v_max, r_max)

#define CAP_MIDR_RANGE_LIST(list)				\
	.matches = is_affected_midr_range_list,			\
	.midr_range_list = list

/* Errata affecting a range of revisions of  given model variant */
#define ERRATA_MIDR_REV_RANGE(m, var, r_min, r_max)	 \
	ERRATA_MIDR_RANGE(m, var, r_min, var, r_max)

/* Errata affecting a single variant/revision of a model */
#define ERRATA_MIDR_REV(model, var, rev)	\
	ERRATA_MIDR_RANGE(model, var, rev, var, rev)

/* Errata affecting all variants/revisions of a given a model */
#define ERRATA_MIDR_ALL_VERSIONS(model)				\
	.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,			\
	CAP_MIDR_ALL_VERSIONS(model)

/* Errata affecting a list of midr ranges, with same work around */
#define ERRATA_MIDR_RANGE_LIST(midr_list)			\
	.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,			\
	CAP_MIDR_RANGE_LIST(midr_list)

/* Track overall mitigation state. We are only mitigated if all cores are ok */
static bool __hardenbp_enab = true;
static bool __spectrev2_safe = true;

/*
 * List of CPUs that do not need any Spectre-v2 mitigation at all.
 */
static const struct midr_range spectre_v2_safe_list[] = {
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A35),
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A53),
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A55),
	{ /* sentinel */ }
};

/*
 * Track overall bp hardening for all heterogeneous cores in the machine.
 * We are only considered "safe" if all booted cores are known safe.
 */
static bool __maybe_unused
check_branch_predictor(const struct arm64_cpu_capabilities *entry, int scope)
{
	int need_wa;

	WARN_ON(scope != SCOPE_LOCAL_CPU || preemptible());

	/* If the CPU has CSV2 set, we're safe */
	if (cpuid_feature_extract_unsigned_field(read_cpuid(ID_AA64PFR0_EL1),
						 ID_AA64PFR0_CSV2_SHIFT))
		return false;

	/* Alternatively, we have a list of unaffected CPUs */
	if (is_midr_in_range_list(read_cpuid_id(), spectre_v2_safe_list))
		return false;

	/* Fallback to firmware detection */
	need_wa = detect_harden_bp_fw();
	if (!need_wa)
		return false;

	__spectrev2_safe = false;

	if (!IS_ENABLED(CONFIG_HARDEN_BRANCH_PREDICTOR)) {
		pr_warn_once("spectrev2 mitigation disabled by kernel configuration\n");
		__hardenbp_enab = false;
		return false;
	}

	/* forced off */
	if (__nospectre_v2 || cpu_mitigations_off()) {
		pr_info_once("spectrev2 mitigation disabled by command line option\n");
		__hardenbp_enab = false;
		return false;
	}

	if (need_wa < 0) {
		pr_warn_once("ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware\n");
		__hardenbp_enab = false;
	}

	return (need_wa > 0);
}

#ifdef CONFIG_HARDEN_EL2_VECTORS

static const struct midr_range arm64_harden_el2_vectors[] = {
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
	MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
	{},
};

#endif

#ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI

static const struct midr_range arm64_repeat_tlbi_cpus[] = {
#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1009
	MIDR_RANGE(MIDR_QCOM_FALKOR_V1, 0, 0, 0, 0),
#endif
#ifdef CONFIG_ARM64_ERRATUM_1286807
	MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 3, 0),
#endif
	{},
};

#endif

#ifdef CONFIG_CAVIUM_ERRATUM_27456
const struct midr_range cavium_erratum_27456_cpus[] = {
	/* Cavium ThunderX, T88 pass 1.x - 2.1 */
	MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 1),
	/* Cavium ThunderX, T81 pass 1.0 */
	MIDR_REV(MIDR_THUNDERX_81XX, 0, 0),
	{},
};
#endif

#ifdef CONFIG_CAVIUM_ERRATUM_30115
static const struct midr_range cavium_erratum_30115_cpus[] = {
	/* Cavium ThunderX, T88 pass 1.x - 2.2 */
	MIDR_RANGE(MIDR_THUNDERX, 0, 0, 1, 2),
	/* Cavium ThunderX, T81 pass 1.0 - 1.2 */
	MIDR_REV_RANGE(MIDR_THUNDERX_81XX, 0, 0, 2),
	/* Cavium ThunderX, T83 pass 1.0 */
	MIDR_REV(MIDR_THUNDERX_83XX, 0, 0),
	{},
};
#endif

#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
static const struct arm64_cpu_capabilities qcom_erratum_1003_list[] = {
	{
		ERRATA_MIDR_REV(MIDR_QCOM_FALKOR_V1, 0, 0),
	},
	{
		.midr_range.model = MIDR_QCOM_KRYO,
		.matches = is_kryo_midr,
	},
	{},
};
#endif

#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
static const struct midr_range workaround_clean_cache[] = {
#if	defined(CONFIG_ARM64_ERRATUM_826319) || \
	defined(CONFIG_ARM64_ERRATUM_827319) || \
	defined(CONFIG_ARM64_ERRATUM_824069)
	/* Cortex-A53 r0p[012]: ARM errata 826319, 827319, 824069 */
	MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 2),
#endif
#ifdef	CONFIG_ARM64_ERRATUM_819472
	/* Cortex-A53 r0p[01] : ARM errata 819472 */
	MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 1),
#endif
	{},
};
#endif

#ifdef CONFIG_ARM64_ERRATUM_1188873
static const struct midr_range erratum_1188873_list[] = {
	/* Cortex-A76 r0p0 to r2p0 */
	MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0),
	/* Neoverse-N1 r0p0 to r2p0 */
	MIDR_RANGE(MIDR_NEOVERSE_N1, 0, 0, 2, 0),
	{},
};
#endif

const struct arm64_cpu_capabilities arm64_errata[] = {
#ifdef CONFIG_ARM64_WORKAROUND_CLEAN_CACHE
	{
		.desc = "ARM errata 826319, 827319, 824069, 819472",
		.capability = ARM64_WORKAROUND_CLEAN_CACHE,
		ERRATA_MIDR_RANGE_LIST(workaround_clean_cache),
		.cpu_enable = cpu_enable_cache_maint_trap,
	},
#endif
#ifdef CONFIG_ARM64_ERRATUM_832075
	{
	/* Cortex-A57 r0p0 - r1p2 */
		.desc = "ARM erratum 832075",
		.capability = ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE,
		ERRATA_MIDR_RANGE(MIDR_CORTEX_A57,
				  0, 0,
				  1, 2),
	},
#endif
#ifdef CONFIG_ARM64_ERRATUM_834220
	{
	/* Cortex-A57 r0p0 - r1p2 */
		.desc = "ARM erratum 834220",
		.capability = ARM64_WORKAROUND_834220,
		ERRATA_MIDR_RANGE(MIDR_CORTEX_A57,
				  0, 0,
				  1, 2),
	},
#endif
#ifdef CONFIG_ARM64_ERRATUM_843419
	{
	/* Cortex-A53 r0p[01234] */
		.desc = "ARM erratum 843419",
		.capability = ARM64_WORKAROUND_843419,
		ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
		MIDR_FIXED(0x4, BIT(8)),
	},
#endif
#ifdef CONFIG_ARM64_ERRATUM_845719
	{
	/* Cortex-A53 r0p[01234] */
		.desc = "ARM erratum 845719",
		.capability = ARM64_WORKAROUND_845719,
		ERRATA_MIDR_REV_RANGE(MIDR_CORTEX_A53, 0, 0, 4),
	},
#endif
#ifdef CONFIG_CAVIUM_ERRATUM_23154
	{
	/* Cavium ThunderX, pass 1.x */
		.desc = "Cavium erratum 23154",
		.capability = ARM64_WORKAROUND_CAVIUM_23154,
		ERRATA_MIDR_REV_RANGE(MIDR_THUNDERX, 0, 0, 1),
	},
#endif
#ifdef CONFIG_CAVIUM_ERRATUM_27456
	{
		.desc = "Cavium erratum 27456",
		.capability = ARM64_WORKAROUND_CAVIUM_27456,
		ERRATA_MIDR_RANGE_LIST(cavium_erratum_27456_cpus),
	},
#endif
#ifdef CONFIG_CAVIUM_ERRATUM_30115
	{
		.desc = "Cavium erratum 30115",
		.capability = ARM64_WORKAROUND_CAVIUM_30115,
		ERRATA_MIDR_RANGE_LIST(cavium_erratum_30115_cpus),
	},
#endif
	{
		.desc = "Mismatched cache type (CTR_EL0)",
		.capability = ARM64_MISMATCHED_CACHE_TYPE,
		.matches = has_mismatched_cache_type,
		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
		.cpu_enable = cpu_enable_trap_ctr_access,
	},
#ifdef CONFIG_QCOM_FALKOR_ERRATUM_1003
	{
		.desc = "Qualcomm Technologies Falkor/Kryo erratum 1003",
		.capability = ARM64_WORKAROUND_QCOM_FALKOR_E1003,
		.matches = cpucap_multi_entry_cap_matches,
		.match_list = qcom_erratum_1003_list,
	},
#endif
#ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI
	{
		.desc = "Qualcomm erratum 1009, ARM erratum 1286807",
		.capability = ARM64_WORKAROUND_REPEAT_TLBI,
		ERRATA_MIDR_RANGE_LIST(arm64_repeat_tlbi_cpus),
	},
#endif
#ifdef CONFIG_ARM64_ERRATUM_858921
	{
	/* Cortex-A73 all versions */
		.desc = "ARM erratum 858921",
		.capability = ARM64_WORKAROUND_858921,
		ERRATA_MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
	},
#endif
	{
		.capability = ARM64_HARDEN_BRANCH_PREDICTOR,
		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
		.matches = check_branch_predictor,
	},
#ifdef CONFIG_HARDEN_EL2_VECTORS
	{
		.desc = "EL2 vector hardening",
		.capability = ARM64_HARDEN_EL2_VECTORS,
		ERRATA_MIDR_RANGE_LIST(arm64_harden_el2_vectors),
	},
#endif
	{
		.desc = "Speculative Store Bypass Disable",
		.capability = ARM64_SSBD,
		.type = ARM64_CPUCAP_LOCAL_CPU_ERRATUM,
		.matches = has_ssbd_mitigation,
		.midr_range_list = arm64_ssb_cpus,
	},
#ifdef CONFIG_ARM64_ERRATUM_1188873
	{
		.desc = "ARM erratum 1188873",
		.capability = ARM64_WORKAROUND_1188873,
		ERRATA_MIDR_RANGE_LIST(erratum_1188873_list),
	},
#endif
#ifdef CONFIG_ARM64_ERRATUM_1165522
	{
		/* Cortex-A76 r0p0 to r2p0 */
		.desc = "ARM erratum 1165522",
		.capability = ARM64_WORKAROUND_1165522,
		ERRATA_MIDR_RANGE(MIDR_CORTEX_A76, 0, 0, 2, 0),
	},
#endif
	{
	}
};

ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	return sprintf(buf, "Mitigation: __user pointer sanitization\n");
}

ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	if (__spectrev2_safe)
		return sprintf(buf, "Not affected\n");

	if (__hardenbp_enab)
		return sprintf(buf, "Mitigation: Branch predictor hardening\n");

	return sprintf(buf, "Vulnerable\n");
}

ssize_t cpu_show_spec_store_bypass(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	if (__ssb_safe)
		return sprintf(buf, "Not affected\n");

	switch (ssbd_state) {
	case ARM64_SSBD_KERNEL:
	case ARM64_SSBD_FORCE_ENABLE:
		if (IS_ENABLED(CONFIG_ARM64_SSBD))
			return sprintf(buf,
			    "Mitigation: Speculative Store Bypass disabled via prctl\n");
	}

	return sprintf(buf, "Vulnerable\n");
}