summaryrefslogtreecommitdiffstats
path: root/arch/loongarch/kvm/vcpu.c
blob: 73d0c2b9c1a5769215a68bfd572f2785679ef01e (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
 */

#include <linux/kvm_host.h>
#include <linux/entry-kvm.h>
#include <asm/fpu.h>
#include <asm/loongarch.h>
#include <asm/setup.h>
#include <asm/time.h>

#define CREATE_TRACE_POINTS
#include "trace.h"

const struct _kvm_stats_desc kvm_vcpu_stats_desc[] = {
	KVM_GENERIC_VCPU_STATS(),
	STATS_DESC_COUNTER(VCPU, int_exits),
	STATS_DESC_COUNTER(VCPU, idle_exits),
	STATS_DESC_COUNTER(VCPU, cpucfg_exits),
	STATS_DESC_COUNTER(VCPU, signal_exits),
};

const struct kvm_stats_header kvm_vcpu_stats_header = {
	.name_size = KVM_STATS_NAME_SIZE,
	.num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
	.id_offset = sizeof(struct kvm_stats_header),
	.desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
	.data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
		       sizeof(kvm_vcpu_stats_desc),
};

/*
 * kvm_check_requests - check and handle pending vCPU requests
 *
 * Return: RESUME_GUEST if we should enter the guest
 *         RESUME_HOST  if we should exit to userspace
 */
static int kvm_check_requests(struct kvm_vcpu *vcpu)
{
	if (!kvm_request_pending(vcpu))
		return RESUME_GUEST;

	if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
		vcpu->arch.vpid = 0;  /* Drop vpid for this vCPU */

	if (kvm_dirty_ring_check_request(vcpu))
		return RESUME_HOST;

	return RESUME_GUEST;
}

/*
 * Check and handle pending signal and vCPU requests etc
 * Run with irq enabled and preempt enabled
 *
 * Return: RESUME_GUEST if we should enter the guest
 *         RESUME_HOST  if we should exit to userspace
 *         < 0 if we should exit to userspace, where the return value
 *         indicates an error
 */
static int kvm_enter_guest_check(struct kvm_vcpu *vcpu)
{
	int ret;

	/*
	 * Check conditions before entering the guest
	 */
	ret = xfer_to_guest_mode_handle_work(vcpu);
	if (ret < 0)
		return ret;

	ret = kvm_check_requests(vcpu);

	return ret;
}

/*
 * Called with irq enabled
 *
 * Return: RESUME_GUEST if we should enter the guest, and irq disabled
 *         Others if we should exit to userspace
 */
static int kvm_pre_enter_guest(struct kvm_vcpu *vcpu)
{
	int ret;

	do {
		ret = kvm_enter_guest_check(vcpu);
		if (ret != RESUME_GUEST)
			break;

		/*
		 * Handle vcpu timer, interrupts, check requests and
		 * check vmid before vcpu enter guest
		 */
		local_irq_disable();
		kvm_acquire_timer(vcpu);
		kvm_deliver_intr(vcpu);
		kvm_deliver_exception(vcpu);
		/* Make sure the vcpu mode has been written */
		smp_store_mb(vcpu->mode, IN_GUEST_MODE);
		kvm_check_vpid(vcpu);
		vcpu->arch.host_eentry = csr_read64(LOONGARCH_CSR_EENTRY);
		/* Clear KVM_LARCH_SWCSR_LATEST as CSR will change when enter guest */
		vcpu->arch.aux_inuse &= ~KVM_LARCH_SWCSR_LATEST;

		if (kvm_request_pending(vcpu) || xfer_to_guest_mode_work_pending()) {
			/* make sure the vcpu mode has been written */
			smp_store_mb(vcpu->mode, OUTSIDE_GUEST_MODE);
			local_irq_enable();
			ret = -EAGAIN;
		}
	} while (ret != RESUME_GUEST);

	return ret;
}

/*
 * Return 1 for resume guest and "<= 0" for resume host.
 */
static int kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
	int ret = RESUME_GUEST;
	unsigned long estat = vcpu->arch.host_estat;
	u32 intr = estat & 0x1fff; /* Ignore NMI */
	u32 ecode = (estat & CSR_ESTAT_EXC) >> CSR_ESTAT_EXC_SHIFT;

	vcpu->mode = OUTSIDE_GUEST_MODE;

	/* Set a default exit reason */
	run->exit_reason = KVM_EXIT_UNKNOWN;

	guest_timing_exit_irqoff();
	guest_state_exit_irqoff();
	local_irq_enable();

	trace_kvm_exit(vcpu, ecode);
	if (ecode) {
		ret = kvm_handle_fault(vcpu, ecode);
	} else {
		WARN(!intr, "vm exiting with suspicious irq\n");
		++vcpu->stat.int_exits;
	}

	if (ret == RESUME_GUEST)
		ret = kvm_pre_enter_guest(vcpu);

	if (ret != RESUME_GUEST) {
		local_irq_disable();
		return ret;
	}

	guest_timing_enter_irqoff();
	guest_state_enter_irqoff();
	trace_kvm_reenter(vcpu);

	return RESUME_GUEST;
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
	return !!(vcpu->arch.irq_pending) &&
		vcpu->arch.mp_state.mp_state == KVM_MP_STATE_RUNNABLE;
}

int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
	return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
}

bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
{
	return false;
}

vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
	return VM_FAULT_SIGBUS;
}

int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				  struct kvm_translation *tr)
{
	return -EINVAL;
}

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
	return kvm_pending_timer(vcpu) ||
		kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT) & (1 << INT_TI);
}

int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
{
	int i;

	kvm_debug("vCPU Register Dump:\n");
	kvm_debug("\tPC = 0x%08lx\n", vcpu->arch.pc);
	kvm_debug("\tExceptions: %08lx\n", vcpu->arch.irq_pending);

	for (i = 0; i < 32; i += 4) {
		kvm_debug("\tGPR%02d: %08lx %08lx %08lx %08lx\n", i,
		       vcpu->arch.gprs[i], vcpu->arch.gprs[i + 1],
		       vcpu->arch.gprs[i + 2], vcpu->arch.gprs[i + 3]);
	}

	kvm_debug("\tCRMD: 0x%08lx, ESTAT: 0x%08lx\n",
		  kvm_read_hw_gcsr(LOONGARCH_CSR_CRMD),
		  kvm_read_hw_gcsr(LOONGARCH_CSR_ESTAT));

	kvm_debug("\tERA: 0x%08lx\n", kvm_read_hw_gcsr(LOONGARCH_CSR_ERA));

	return 0;
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
				struct kvm_mp_state *mp_state)
{
	*mp_state = vcpu->arch.mp_state;

	return 0;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
				struct kvm_mp_state *mp_state)
{
	int ret = 0;

	switch (mp_state->mp_state) {
	case KVM_MP_STATE_RUNNABLE:
		vcpu->arch.mp_state = *mp_state;
		break;
	default:
		ret = -EINVAL;
	}

	return ret;
}

int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
					struct kvm_guest_debug *dbg)
{
	return -EINVAL;
}

/**
 * kvm_migrate_count() - Migrate timer.
 * @vcpu:       Virtual CPU.
 *
 * Migrate hrtimer to the current CPU by cancelling and restarting it
 * if the hrtimer is active.
 *
 * Must be called when the vCPU is migrated to a different CPU, so that
 * the timer can interrupt the guest at the new CPU, and the timer irq can
 * be delivered to the vCPU.
 */
static void kvm_migrate_count(struct kvm_vcpu *vcpu)
{
	if (hrtimer_cancel(&vcpu->arch.swtimer))
		hrtimer_restart(&vcpu->arch.swtimer);
}

static int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *val)
{
	unsigned long gintc;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	if (get_gcsr_flag(id) & INVALID_GCSR)
		return -EINVAL;

	if (id == LOONGARCH_CSR_ESTAT) {
		/* ESTAT IP0~IP7 get from GINTC */
		gintc = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff;
		*val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_ESTAT) | (gintc << 2);
		return 0;
	}

	/*
	 * Get software CSR state since software state is consistent
	 * with hardware for synchronous ioctl
	 */
	*val = kvm_read_sw_gcsr(csr, id);

	return 0;
}

static int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val)
{
	int ret = 0, gintc;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	if (get_gcsr_flag(id) & INVALID_GCSR)
		return -EINVAL;

	if (id == LOONGARCH_CSR_ESTAT) {
		/* ESTAT IP0~IP7 inject through GINTC */
		gintc = (val >> 2) & 0xff;
		kvm_set_sw_gcsr(csr, LOONGARCH_CSR_GINTC, gintc);

		gintc = val & ~(0xffUL << 2);
		kvm_set_sw_gcsr(csr, LOONGARCH_CSR_ESTAT, gintc);

		return ret;
	}

	kvm_write_sw_gcsr(csr, id, val);

	return ret;
}

static int kvm_get_one_reg(struct kvm_vcpu *vcpu,
		const struct kvm_one_reg *reg, u64 *v)
{
	int id, ret = 0;
	u64 type = reg->id & KVM_REG_LOONGARCH_MASK;

	switch (type) {
	case KVM_REG_LOONGARCH_CSR:
		id = KVM_GET_IOC_CSR_IDX(reg->id);
		ret = _kvm_getcsr(vcpu, id, v);
		break;
	case KVM_REG_LOONGARCH_CPUCFG:
		id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
		if (id >= 0 && id < KVM_MAX_CPUCFG_REGS)
			*v = vcpu->arch.cpucfg[id];
		else
			ret = -EINVAL;
		break;
	case KVM_REG_LOONGARCH_KVM:
		switch (reg->id) {
		case KVM_REG_LOONGARCH_COUNTER:
			*v = drdtime() + vcpu->kvm->arch.time_offset;
			break;
		default:
			ret = -EINVAL;
			break;
		}
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	int ret = 0;
	u64 v, size = reg->id & KVM_REG_SIZE_MASK;

	switch (size) {
	case KVM_REG_SIZE_U64:
		ret = kvm_get_one_reg(vcpu, reg, &v);
		if (ret)
			return ret;
		ret = put_user(v, (u64 __user *)(long)reg->addr);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int kvm_set_one_reg(struct kvm_vcpu *vcpu,
			const struct kvm_one_reg *reg, u64 v)
{
	int id, ret = 0;
	u64 type = reg->id & KVM_REG_LOONGARCH_MASK;

	switch (type) {
	case KVM_REG_LOONGARCH_CSR:
		id = KVM_GET_IOC_CSR_IDX(reg->id);
		ret = _kvm_setcsr(vcpu, id, v);
		break;
	case KVM_REG_LOONGARCH_CPUCFG:
		id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
		if (id >= 0 && id < KVM_MAX_CPUCFG_REGS)
			vcpu->arch.cpucfg[id] = (u32)v;
		else
			ret = -EINVAL;
		break;
	case KVM_REG_LOONGARCH_KVM:
		switch (reg->id) {
		case KVM_REG_LOONGARCH_COUNTER:
			/*
			 * gftoffset is relative with board, not vcpu
			 * only set for the first time for smp system
			 */
			if (vcpu->vcpu_id == 0)
				vcpu->kvm->arch.time_offset = (signed long)(v - drdtime());
			break;
		case KVM_REG_LOONGARCH_VCPU_RESET:
			kvm_reset_timer(vcpu);
			memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending));
			memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear));
			break;
		default:
			ret = -EINVAL;
			break;
		}
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static int kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
{
	int ret = 0;
	u64 v, size = reg->id & KVM_REG_SIZE_MASK;

	switch (size) {
	case KVM_REG_SIZE_U64:
		ret = get_user(v, (u64 __user *)(long)reg->addr);
		if (ret)
			return ret;
		break;
	default:
		return -EINVAL;
	}

	return kvm_set_one_reg(vcpu, reg, v);
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	return -ENOIOCTLCMD;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
{
	return -ENOIOCTLCMD;
}

int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
		regs->gpr[i] = vcpu->arch.gprs[i];

	regs->pc = vcpu->arch.pc;

	return 0;
}

int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
	int i;

	for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
		vcpu->arch.gprs[i] = regs->gpr[i];

	vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
	vcpu->arch.pc = regs->pc;

	return 0;
}

static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
				     struct kvm_enable_cap *cap)
{
	/* FPU is enabled by default, will support LSX/LASX later. */
	return -EINVAL;
}

long kvm_arch_vcpu_ioctl(struct file *filp,
			 unsigned int ioctl, unsigned long arg)
{
	long r;
	void __user *argp = (void __user *)arg;
	struct kvm_vcpu *vcpu = filp->private_data;

	/*
	 * Only software CSR should be modified
	 *
	 * If any hardware CSR register is modified, vcpu_load/vcpu_put pair
	 * should be used. Since CSR registers owns by this vcpu, if switch
	 * to other vcpus, other vcpus need reload CSR registers.
	 *
	 * If software CSR is modified, bit KVM_LARCH_HWCSR_USABLE should
	 * be clear in vcpu->arch.aux_inuse, and vcpu_load will check
	 * aux_inuse flag and reload CSR registers form software.
	 */

	switch (ioctl) {
	case KVM_SET_ONE_REG:
	case KVM_GET_ONE_REG: {
		struct kvm_one_reg reg;

		r = -EFAULT;
		if (copy_from_user(&reg, argp, sizeof(reg)))
			break;
		if (ioctl == KVM_SET_ONE_REG) {
			r = kvm_set_reg(vcpu, &reg);
			vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
		} else
			r = kvm_get_reg(vcpu, &reg);
		break;
	}
	case KVM_ENABLE_CAP: {
		struct kvm_enable_cap cap;

		r = -EFAULT;
		if (copy_from_user(&cap, argp, sizeof(cap)))
			break;
		r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
		break;
	}
	default:
		r = -ENOIOCTLCMD;
		break;
	}

	return r;
}

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	int i = 0;

	fpu->fcc = vcpu->arch.fpu.fcc;
	fpu->fcsr = vcpu->arch.fpu.fcsr;
	for (i = 0; i < NUM_FPU_REGS; i++)
		memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64);

	return 0;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	int i = 0;

	vcpu->arch.fpu.fcc = fpu->fcc;
	vcpu->arch.fpu.fcsr = fpu->fcsr;
	for (i = 0; i < NUM_FPU_REGS; i++)
		memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64);

	return 0;
}

/* Enable FPU and restore context */
void kvm_own_fpu(struct kvm_vcpu *vcpu)
{
	preempt_disable();

	/* Enable FPU */
	set_csr_euen(CSR_EUEN_FPEN);

	kvm_restore_fpu(&vcpu->arch.fpu);
	vcpu->arch.aux_inuse |= KVM_LARCH_FPU;
	trace_kvm_aux(vcpu, KVM_TRACE_AUX_RESTORE, KVM_TRACE_AUX_FPU);

	preempt_enable();
}

/* Save context and disable FPU */
void kvm_lose_fpu(struct kvm_vcpu *vcpu)
{
	preempt_disable();

	if (vcpu->arch.aux_inuse & KVM_LARCH_FPU) {
		kvm_save_fpu(&vcpu->arch.fpu);
		vcpu->arch.aux_inuse &= ~KVM_LARCH_FPU;
		trace_kvm_aux(vcpu, KVM_TRACE_AUX_SAVE, KVM_TRACE_AUX_FPU);

		/* Disable FPU */
		clear_csr_euen(CSR_EUEN_FPEN);
	}

	preempt_enable();
}

int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
	int intr = (int)irq->irq;

	if (intr > 0)
		kvm_queue_irq(vcpu, intr);
	else if (intr < 0)
		kvm_dequeue_irq(vcpu, -intr);
	else {
		kvm_err("%s: invalid interrupt ioctl %d\n", __func__, irq->irq);
		return -EINVAL;
	}

	kvm_vcpu_kick(vcpu);

	return 0;
}

long kvm_arch_vcpu_async_ioctl(struct file *filp,
			       unsigned int ioctl, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct kvm_vcpu *vcpu = filp->private_data;

	if (ioctl == KVM_INTERRUPT) {
		struct kvm_interrupt irq;

		if (copy_from_user(&irq, argp, sizeof(irq)))
			return -EFAULT;

		kvm_debug("[%d] %s: irq: %d\n", vcpu->vcpu_id, __func__, irq.irq);

		return kvm_vcpu_ioctl_interrupt(vcpu, &irq);
	}

	return -ENOIOCTLCMD;
}

int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
{
	return 0;
}

int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
{
	unsigned long timer_hz;
	struct loongarch_csrs *csr;

	vcpu->arch.vpid = 0;

	hrtimer_init(&vcpu->arch.swtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
	vcpu->arch.swtimer.function = kvm_swtimer_wakeup;

	vcpu->arch.handle_exit = kvm_handle_exit;
	vcpu->arch.guest_eentry = (unsigned long)kvm_loongarch_ops->exc_entry;
	vcpu->arch.csr = kzalloc(sizeof(struct loongarch_csrs), GFP_KERNEL);
	if (!vcpu->arch.csr)
		return -ENOMEM;

	/*
	 * All kvm exceptions share one exception entry, and host <-> guest
	 * switch also switch ECFG.VS field, keep host ECFG.VS info here.
	 */
	vcpu->arch.host_ecfg = (read_csr_ecfg() & CSR_ECFG_VS);

	/* Init */
	vcpu->arch.last_sched_cpu = -1;

	/*
	 * Initialize guest register state to valid architectural reset state.
	 */
	timer_hz = calc_const_freq();
	kvm_init_timer(vcpu, timer_hz);

	/* Set Initialize mode for guest */
	csr = vcpu->arch.csr;
	kvm_write_sw_gcsr(csr, LOONGARCH_CSR_CRMD, CSR_CRMD_DA);

	/* Set cpuid */
	kvm_write_sw_gcsr(csr, LOONGARCH_CSR_TMID, vcpu->vcpu_id);

	/* Start with no pending virtual guest interrupts */
	csr->csrs[LOONGARCH_CSR_GINTC] = 0;

	return 0;
}

void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
	int cpu;
	struct kvm_context *context;

	hrtimer_cancel(&vcpu->arch.swtimer);
	kvm_mmu_free_memory_cache(&vcpu->arch.mmu_page_cache);
	kfree(vcpu->arch.csr);

	/*
	 * If the vCPU is freed and reused as another vCPU, we don't want the
	 * matching pointer wrongly hanging around in last_vcpu.
	 */
	for_each_possible_cpu(cpu) {
		context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
		if (context->last_vcpu == vcpu)
			context->last_vcpu = NULL;
	}
}

static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	bool migrated;
	struct kvm_context *context;
	struct loongarch_csrs *csr = vcpu->arch.csr;

	/*
	 * Have we migrated to a different CPU?
	 * If so, any old guest TLB state may be stale.
	 */
	migrated = (vcpu->arch.last_sched_cpu != cpu);

	/*
	 * Was this the last vCPU to run on this CPU?
	 * If not, any old guest state from this vCPU will have been clobbered.
	 */
	context = per_cpu_ptr(vcpu->kvm->arch.vmcs, cpu);
	if (migrated || (context->last_vcpu != vcpu))
		vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
	context->last_vcpu = vcpu;

	/* Restore timer state regardless */
	kvm_restore_timer(vcpu);

	/* Control guest page CCA attribute */
	change_csr_gcfg(CSR_GCFG_MATC_MASK, CSR_GCFG_MATC_ROOT);

	/* Don't bother restoring registers multiple times unless necessary */
	if (vcpu->arch.aux_inuse & KVM_LARCH_HWCSR_USABLE)
		return 0;

	write_csr_gcntc((ulong)vcpu->kvm->arch.time_offset);

	/* Restore guest CSR registers */
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CRMD);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PRMD);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EUEN);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_MISC);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ECFG);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ERA);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADV);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_BADI);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_EENTRY);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_ASID);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDL);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PGDH);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_RVACFG);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CPUID);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS2);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS3);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS4);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS5);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS6);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_KS7);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TMID);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_CNTC);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);
	kvm_restore_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);

	/* Restore Root.GINTC from unused Guest.GINTC register */
	write_csr_gintc(csr->csrs[LOONGARCH_CSR_GINTC]);

	/*
	 * We should clear linked load bit to break interrupted atomics. This
	 * prevents a SC on the next vCPU from succeeding by matching a LL on
	 * the previous vCPU.
	 */
	if (vcpu->kvm->created_vcpus > 1)
		set_gcsr_llbctl(CSR_LLBCTL_WCLLB);

	vcpu->arch.aux_inuse |= KVM_LARCH_HWCSR_USABLE;

	return 0;
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	unsigned long flags;

	local_irq_save(flags);
	if (vcpu->arch.last_sched_cpu != cpu) {
		kvm_debug("[%d->%d]KVM vCPU[%d] switch\n",
				vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id);
		/*
		 * Migrate the timer interrupt to the current CPU so that it
		 * always interrupts the guest and synchronously triggers a
		 * guest timer interrupt.
		 */
		kvm_migrate_count(vcpu);
	}

	/* Restore guest state to registers */
	_kvm_vcpu_load(vcpu, cpu);
	local_irq_restore(flags);
}

static int _kvm_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
{
	struct loongarch_csrs *csr = vcpu->arch.csr;

	kvm_lose_fpu(vcpu);

	/*
	 * Update CSR state from hardware if software CSR state is stale,
	 * most CSR registers are kept unchanged during process context
	 * switch except CSR registers like remaining timer tick value and
	 * injected interrupt state.
	 */
	if (vcpu->arch.aux_inuse & KVM_LARCH_SWCSR_LATEST)
		goto out;

	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CRMD);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRMD);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EUEN);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_MISC);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ECFG);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ERA);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADV);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_BADI);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_EENTRY);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBIDX);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBEHI);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBELO1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_ASID);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDL);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PGDH);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PWCTL1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_STLBPGSIZE);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_RVACFG);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CPUID);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_PRCFG3);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS3);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS4);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS5);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS6);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_KS7);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TMID);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_CNTC);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_LLBCTL);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRENTRY);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRBADV);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRERA);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRSAVE);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRELO1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBREHI);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_TLBRPRMD);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN0);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN1);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN2);
	kvm_save_hw_gcsr(csr, LOONGARCH_CSR_DMWIN3);

	vcpu->arch.aux_inuse |= KVM_LARCH_SWCSR_LATEST;

out:
	kvm_save_timer(vcpu);
	/* Save Root.GINTC into unused Guest.GINTC register */
	csr->csrs[LOONGARCH_CSR_GINTC] = read_csr_gintc();

	return 0;
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
	int cpu;
	unsigned long flags;

	local_irq_save(flags);
	cpu = smp_processor_id();
	vcpu->arch.last_sched_cpu = cpu;

	/* Save guest state in registers */
	_kvm_vcpu_put(vcpu, cpu);
	local_irq_restore(flags);
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
{
	int r = -EINTR;
	struct kvm_run *run = vcpu->run;

	if (vcpu->mmio_needed) {
		if (!vcpu->mmio_is_write)
			kvm_complete_mmio_read(vcpu, run);
		vcpu->mmio_needed = 0;
	}

	if (run->exit_reason == KVM_EXIT_LOONGARCH_IOCSR) {
		if (!run->iocsr_io.is_write)
			kvm_complete_iocsr_read(vcpu, run);
	}

	if (run->immediate_exit)
		return r;

	/* Clear exit_reason */
	run->exit_reason = KVM_EXIT_UNKNOWN;
	lose_fpu(1);
	vcpu_load(vcpu);
	kvm_sigset_activate(vcpu);
	r = kvm_pre_enter_guest(vcpu);
	if (r != RESUME_GUEST)
		goto out;

	guest_timing_enter_irqoff();
	guest_state_enter_irqoff();
	trace_kvm_enter(vcpu);
	r = kvm_loongarch_ops->enter_guest(run, vcpu);

	trace_kvm_out(vcpu);
	/*
	 * Guest exit is already recorded at kvm_handle_exit()
	 * return value must not be RESUME_GUEST
	 */
	local_irq_enable();
out:
	kvm_sigset_deactivate(vcpu);
	vcpu_put(vcpu);

	return r;
}