aboutsummaryrefslogtreecommitdiff
path: root/target-ppc/kvm.c
blob: c09cc39c78a7962b032b5a01c1d1d6a6132d065f (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
/*
 * PowerPC implementation of KVM hooks
 *
 * Copyright IBM Corp. 2007
 * Copyright (C) 2011 Freescale Semiconductor, Inc.
 *
 * Authors:
 *  Jerone Young <jyoung5@us.ibm.com>
 *  Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
 *  Hollis Blanchard <hollisb@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2 or later.
 * See the COPYING file in the top-level directory.
 *
 */

#include <dirent.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>

#include <linux/kvm.h>

#include "qemu-common.h"
#include "qemu-timer.h"
#include "sysemu.h"
#include "kvm.h"
#include "kvm_ppc.h"
#include "cpu.h"
#include "cpus.h"
#include "device_tree.h"
#include "hw/sysbus.h"
#include "hw/spapr.h"

#include "hw/sysbus.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"

//#define DEBUG_KVM

#ifdef DEBUG_KVM
#define dprintf(fmt, ...) \
    do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
    do { } while (0)
#endif

#define PROC_DEVTREE_CPU      "/proc/device-tree/cpus/"

const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
    KVM_CAP_LAST_INFO
};

static int cap_interrupt_unset = false;
static int cap_interrupt_level = false;
static int cap_segstate;
static int cap_booke_sregs;
static int cap_ppc_smt;
static int cap_ppc_rma;
static int cap_spapr_tce;

/* XXX We have a race condition where we actually have a level triggered
 *     interrupt, but the infrastructure can't expose that yet, so the guest
 *     takes but ignores it, goes to sleep and never gets notified that there's
 *     still an interrupt pending.
 *
 *     As a quick workaround, let's just wake up again 20 ms after we injected
 *     an interrupt. That way we can assure that we're always reinjecting
 *     interrupts in case the guest swallowed them.
 */
static QEMUTimer *idle_timer;

static void kvm_kick_env(void *env)
{
    qemu_cpu_kick(env);
}

int kvm_arch_init(KVMState *s)
{
    cap_interrupt_unset = kvm_check_extension(s, KVM_CAP_PPC_UNSET_IRQ);
    cap_interrupt_level = kvm_check_extension(s, KVM_CAP_PPC_IRQ_LEVEL);
    cap_segstate = kvm_check_extension(s, KVM_CAP_PPC_SEGSTATE);
    cap_booke_sregs = kvm_check_extension(s, KVM_CAP_PPC_BOOKE_SREGS);
    cap_ppc_smt = kvm_check_extension(s, KVM_CAP_PPC_SMT);
    cap_ppc_rma = kvm_check_extension(s, KVM_CAP_PPC_RMA);
    cap_spapr_tce = kvm_check_extension(s, KVM_CAP_SPAPR_TCE);

    if (!cap_interrupt_level) {
        fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "
                        "VM to stall at times!\n");
    }

    return 0;
}

static int kvm_arch_sync_sregs(CPUPPCState *cenv)
{
    struct kvm_sregs sregs;
    int ret;

    if (cenv->excp_model == POWERPC_EXCP_BOOKE) {
        /* What we're really trying to say is "if we're on BookE, we use
           the native PVR for now". This is the only sane way to check
           it though, so we potentially confuse users that they can run
           BookE guests on BookS. Let's hope nobody dares enough :) */
        return 0;
    } else {
        if (!cap_segstate) {
            fprintf(stderr, "kvm error: missing PVR setting capability\n");
            return -ENOSYS;
        }
    }

    ret = kvm_vcpu_ioctl(cenv, KVM_GET_SREGS, &sregs);
    if (ret) {
        return ret;
    }

    sregs.pvr = cenv->spr[SPR_PVR];
    return kvm_vcpu_ioctl(cenv, KVM_SET_SREGS, &sregs);
}

/* Set up a shared TLB array with KVM */
static int kvm_booke206_tlb_init(CPUPPCState *env)
{
    struct kvm_book3e_206_tlb_params params = {};
    struct kvm_config_tlb cfg = {};
    struct kvm_enable_cap encap = {};
    unsigned int entries = 0;
    int ret, i;

    if (!kvm_enabled() ||
        !kvm_check_extension(env->kvm_state, KVM_CAP_SW_TLB)) {
        return 0;
    }

    assert(ARRAY_SIZE(params.tlb_sizes) == BOOKE206_MAX_TLBN);

    for (i = 0; i < BOOKE206_MAX_TLBN; i++) {
        params.tlb_sizes[i] = booke206_tlb_size(env, i);
        params.tlb_ways[i] = booke206_tlb_ways(env, i);
        entries += params.tlb_sizes[i];
    }

    assert(entries == env->nb_tlb);
    assert(sizeof(struct kvm_book3e_206_tlb_entry) == sizeof(ppcmas_tlb_t));

    env->tlb_dirty = true;

    cfg.array = (uintptr_t)env->tlb.tlbm;
    cfg.array_len = sizeof(ppcmas_tlb_t) * entries;
    cfg.params = (uintptr_t)&params;
    cfg.mmu_type = KVM_MMU_FSL_BOOKE_NOHV;

    encap.cap = KVM_CAP_SW_TLB;
    encap.args[0] = (uintptr_t)&cfg;

    ret = kvm_vcpu_ioctl(env, KVM_ENABLE_CAP, &encap);
    if (ret < 0) {
        fprintf(stderr, "%s: couldn't enable KVM_CAP_SW_TLB: %s\n",
                __func__, strerror(-ret));
        return ret;
    }

    env->kvm_sw_tlb = true;
    return 0;
}

int kvm_arch_init_vcpu(CPUPPCState *cenv)
{
    int ret;

    ret = kvm_arch_sync_sregs(cenv);
    if (ret) {
        return ret;
    }

    idle_timer = qemu_new_timer_ns(vm_clock, kvm_kick_env, cenv);

    /* Some targets support access to KVM's guest TLB. */
    switch (cenv->mmu_model) {
    case POWERPC_MMU_BOOKE206:
        ret = kvm_booke206_tlb_init(cenv);
        break;
    default:
        break;
    }

    return ret;
}

void kvm_arch_reset_vcpu(CPUPPCState *env)
{
}

static void kvm_sw_tlb_put(CPUPPCState *env)
{
    struct kvm_dirty_tlb dirty_tlb;
    unsigned char *bitmap;
    int ret;

    if (!env->kvm_sw_tlb) {
        return;
    }

    bitmap = g_malloc((env->nb_tlb + 7) / 8);
    memset(bitmap, 0xFF, (env->nb_tlb + 7) / 8);

    dirty_tlb.bitmap = (uintptr_t)bitmap;
    dirty_tlb.num_dirty = env->nb_tlb;

    ret = kvm_vcpu_ioctl(env, KVM_DIRTY_TLB, &dirty_tlb);
    if (ret) {
        fprintf(stderr, "%s: KVM_DIRTY_TLB: %s\n",
                __func__, strerror(-ret));
    }

    g_free(bitmap);
}

int kvm_arch_put_registers(CPUPPCState *env, int level)
{
    struct kvm_regs regs;
    int ret;
    int i;

    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
    if (ret < 0)
        return ret;

    regs.ctr = env->ctr;
    regs.lr  = env->lr;
    regs.xer = env->xer;
    regs.msr = env->msr;
    regs.pc = env->nip;

    regs.srr0 = env->spr[SPR_SRR0];
    regs.srr1 = env->spr[SPR_SRR1];

    regs.sprg0 = env->spr[SPR_SPRG0];
    regs.sprg1 = env->spr[SPR_SPRG1];
    regs.sprg2 = env->spr[SPR_SPRG2];
    regs.sprg3 = env->spr[SPR_SPRG3];
    regs.sprg4 = env->spr[SPR_SPRG4];
    regs.sprg5 = env->spr[SPR_SPRG5];
    regs.sprg6 = env->spr[SPR_SPRG6];
    regs.sprg7 = env->spr[SPR_SPRG7];

    regs.pid = env->spr[SPR_BOOKE_PID];

    for (i = 0;i < 32; i++)
        regs.gpr[i] = env->gpr[i];

    ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
    if (ret < 0)
        return ret;

    if (env->tlb_dirty) {
        kvm_sw_tlb_put(env);
        env->tlb_dirty = false;
    }

    return ret;
}

int kvm_arch_get_registers(CPUPPCState *env)
{
    struct kvm_regs regs;
    struct kvm_sregs sregs;
    uint32_t cr;
    int i, ret;

    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
    if (ret < 0)
        return ret;

    cr = regs.cr;
    for (i = 7; i >= 0; i--) {
        env->crf[i] = cr & 15;
        cr >>= 4;
    }

    env->ctr = regs.ctr;
    env->lr = regs.lr;
    env->xer = regs.xer;
    env->msr = regs.msr;
    env->nip = regs.pc;

    env->spr[SPR_SRR0] = regs.srr0;
    env->spr[SPR_SRR1] = regs.srr1;

    env->spr[SPR_SPRG0] = regs.sprg0;
    env->spr[SPR_SPRG1] = regs.sprg1;
    env->spr[SPR_SPRG2] = regs.sprg2;
    env->spr[SPR_SPRG3] = regs.sprg3;
    env->spr[SPR_SPRG4] = regs.sprg4;
    env->spr[SPR_SPRG5] = regs.sprg5;
    env->spr[SPR_SPRG6] = regs.sprg6;
    env->spr[SPR_SPRG7] = regs.sprg7;

    env->spr[SPR_BOOKE_PID] = regs.pid;

    for (i = 0;i < 32; i++)
        env->gpr[i] = regs.gpr[i];

    if (cap_booke_sregs) {
        ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
        if (ret < 0) {
            return ret;
        }

        if (sregs.u.e.features & KVM_SREGS_E_BASE) {
            env->spr[SPR_BOOKE_CSRR0] = sregs.u.e.csrr0;
            env->spr[SPR_BOOKE_CSRR1] = sregs.u.e.csrr1;
            env->spr[SPR_BOOKE_ESR] = sregs.u.e.esr;
            env->spr[SPR_BOOKE_DEAR] = sregs.u.e.dear;
            env->spr[SPR_BOOKE_MCSR] = sregs.u.e.mcsr;
            env->spr[SPR_BOOKE_TSR] = sregs.u.e.tsr;
            env->spr[SPR_BOOKE_TCR] = sregs.u.e.tcr;
            env->spr[SPR_DECR] = sregs.u.e.dec;
            env->spr[SPR_TBL] = sregs.u.e.tb & 0xffffffff;
            env->spr[SPR_TBU] = sregs.u.e.tb >> 32;
            env->spr[SPR_VRSAVE] = sregs.u.e.vrsave;
        }

        if (sregs.u.e.features & KVM_SREGS_E_ARCH206) {
            env->spr[SPR_BOOKE_PIR] = sregs.u.e.pir;
            env->spr[SPR_BOOKE_MCSRR0] = sregs.u.e.mcsrr0;
            env->spr[SPR_BOOKE_MCSRR1] = sregs.u.e.mcsrr1;
            env->spr[SPR_BOOKE_DECAR] = sregs.u.e.decar;
            env->spr[SPR_BOOKE_IVPR] = sregs.u.e.ivpr;
        }

        if (sregs.u.e.features & KVM_SREGS_E_64) {
            env->spr[SPR_BOOKE_EPCR] = sregs.u.e.epcr;
        }

        if (sregs.u.e.features & KVM_SREGS_E_SPRG8) {
            env->spr[SPR_BOOKE_SPRG8] = sregs.u.e.sprg8;
        }

        if (sregs.u.e.features & KVM_SREGS_E_IVOR) {
            env->spr[SPR_BOOKE_IVOR0] = sregs.u.e.ivor_low[0];
            env->spr[SPR_BOOKE_IVOR1] = sregs.u.e.ivor_low[1];
            env->spr[SPR_BOOKE_IVOR2] = sregs.u.e.ivor_low[2];
            env->spr[SPR_BOOKE_IVOR3] = sregs.u.e.ivor_low[3];
            env->spr[SPR_BOOKE_IVOR4] = sregs.u.e.ivor_low[4];
            env->spr[SPR_BOOKE_IVOR5] = sregs.u.e.ivor_low[5];
            env->spr[SPR_BOOKE_IVOR6] = sregs.u.e.ivor_low[6];
            env->spr[SPR_BOOKE_IVOR7] = sregs.u.e.ivor_low[7];
            env->spr[SPR_BOOKE_IVOR8] = sregs.u.e.ivor_low[8];
            env->spr[SPR_BOOKE_IVOR9] = sregs.u.e.ivor_low[9];
            env->spr[SPR_BOOKE_IVOR10] = sregs.u.e.ivor_low[10];
            env->spr[SPR_BOOKE_IVOR11] = sregs.u.e.ivor_low[11];
            env->spr[SPR_BOOKE_IVOR12] = sregs.u.e.ivor_low[12];
            env->spr[SPR_BOOKE_IVOR13] = sregs.u.e.ivor_low[13];
            env->spr[SPR_BOOKE_IVOR14] = sregs.u.e.ivor_low[14];
            env->spr[SPR_BOOKE_IVOR15] = sregs.u.e.ivor_low[15];

            if (sregs.u.e.features & KVM_SREGS_E_SPE) {
                env->spr[SPR_BOOKE_IVOR32] = sregs.u.e.ivor_high[0];
                env->spr[SPR_BOOKE_IVOR33] = sregs.u.e.ivor_high[1];
                env->spr[SPR_BOOKE_IVOR34] = sregs.u.e.ivor_high[2];
            }

            if (sregs.u.e.features & KVM_SREGS_E_PM) {
                env->spr[SPR_BOOKE_IVOR35] = sregs.u.e.ivor_high[3];
            }

            if (sregs.u.e.features & KVM_SREGS_E_PC) {
                env->spr[SPR_BOOKE_IVOR36] = sregs.u.e.ivor_high[4];
                env->spr[SPR_BOOKE_IVOR37] = sregs.u.e.ivor_high[5];
            }
        }

        if (sregs.u.e.features & KVM_SREGS_E_ARCH206_MMU) {
            env->spr[SPR_BOOKE_MAS0] = sregs.u.e.mas0;
            env->spr[SPR_BOOKE_MAS1] = sregs.u.e.mas1;
            env->spr[SPR_BOOKE_MAS2] = sregs.u.e.mas2;
            env->spr[SPR_BOOKE_MAS3] = sregs.u.e.mas7_3 & 0xffffffff;
            env->spr[SPR_BOOKE_MAS4] = sregs.u.e.mas4;
            env->spr[SPR_BOOKE_MAS6] = sregs.u.e.mas6;
            env->spr[SPR_BOOKE_MAS7] = sregs.u.e.mas7_3 >> 32;
            env->spr[SPR_MMUCFG] = sregs.u.e.mmucfg;
            env->spr[SPR_BOOKE_TLB0CFG] = sregs.u.e.tlbcfg[0];
            env->spr[SPR_BOOKE_TLB1CFG] = sregs.u.e.tlbcfg[1];
        }

        if (sregs.u.e.features & KVM_SREGS_EXP) {
            env->spr[SPR_BOOKE_EPR] = sregs.u.e.epr;
        }

        if (sregs.u.e.features & KVM_SREGS_E_PD) {
            env->spr[SPR_BOOKE_EPLC] = sregs.u.e.eplc;
            env->spr[SPR_BOOKE_EPSC] = sregs.u.e.epsc;
        }

        if (sregs.u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
            env->spr[SPR_E500_SVR] = sregs.u.e.impl.fsl.svr;
            env->spr[SPR_Exxx_MCAR] = sregs.u.e.impl.fsl.mcar;
            env->spr[SPR_HID0] = sregs.u.e.impl.fsl.hid0;

            if (sregs.u.e.impl.fsl.features & KVM_SREGS_E_FSL_PIDn) {
                env->spr[SPR_BOOKE_PID1] = sregs.u.e.impl.fsl.pid1;
                env->spr[SPR_BOOKE_PID2] = sregs.u.e.impl.fsl.pid2;
            }
        }
    }

    if (cap_segstate) {
        ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
        if (ret < 0) {
            return ret;
        }

        ppc_store_sdr1(env, sregs.u.s.sdr1);

        /* Sync SLB */
#ifdef TARGET_PPC64
        for (i = 0; i < 64; i++) {
            ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,
                               sregs.u.s.ppc64.slb[i].slbv);
        }
#endif

        /* Sync SRs */
        for (i = 0; i < 16; i++) {
            env->sr[i] = sregs.u.s.ppc32.sr[i];
        }

        /* Sync BATs */
        for (i = 0; i < 8; i++) {
            env->DBAT[0][i] = sregs.u.s.ppc32.dbat[i] & 0xffffffff;
            env->DBAT[1][i] = sregs.u.s.ppc32.dbat[i] >> 32;
            env->IBAT[0][i] = sregs.u.s.ppc32.ibat[i] & 0xffffffff;
            env->IBAT[1][i] = sregs.u.s.ppc32.ibat[i] >> 32;
        }
    }

    return 0;
}

int kvmppc_set_interrupt(CPUPPCState *env, int irq, int level)
{
    unsigned virq = level ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;

    if (irq != PPC_INTERRUPT_EXT) {
        return 0;
    }

    if (!kvm_enabled() || !cap_interrupt_unset || !cap_interrupt_level) {
        return 0;
    }

    kvm_vcpu_ioctl(env, KVM_INTERRUPT, &virq);

    return 0;
}

#if defined(TARGET_PPCEMB)
#define PPC_INPUT_INT PPC40x_INPUT_INT
#elif defined(TARGET_PPC64)
#define PPC_INPUT_INT PPC970_INPUT_INT
#else
#define PPC_INPUT_INT PPC6xx_INPUT_INT
#endif

void kvm_arch_pre_run(CPUPPCState *env, struct kvm_run *run)
{
    int r;
    unsigned irq;

    /* PowerPC QEMU tracks the various core input pins (interrupt, critical
     * interrupt, reset, etc) in PPC-specific env->irq_input_state. */
    if (!cap_interrupt_level &&
        run->ready_for_interrupt_injection &&
        (env->interrupt_request & CPU_INTERRUPT_HARD) &&
        (env->irq_input_state & (1<<PPC_INPUT_INT)))
    {
        /* For now KVM disregards the 'irq' argument. However, in the
         * future KVM could cache it in-kernel to avoid a heavyweight exit
         * when reading the UIC.
         */
        irq = KVM_INTERRUPT_SET;

        dprintf("injected interrupt %d\n", irq);
        r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);
        if (r < 0)
            printf("cpu %d fail inject %x\n", env->cpu_index, irq);

        /* Always wake up soon in case the interrupt was level based */
        qemu_mod_timer(idle_timer, qemu_get_clock_ns(vm_clock) +
                       (get_ticks_per_sec() / 50));
    }

    /* We don't know if there are more interrupts pending after this. However,
     * the guest will return to userspace in the course of handling this one
     * anyways, so we will get a chance to deliver the rest. */
}

void kvm_arch_post_run(CPUPPCState *env, struct kvm_run *run)
{
}

int kvm_arch_process_async_events(CPUPPCState *env)
{
    return env->halted;
}

static int kvmppc_handle_halt(CPUPPCState *env)
{
    if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {
        env->halted = 1;
        env->exception_index = EXCP_HLT;
    }

    return 0;
}

/* map dcr access to existing qemu dcr emulation */
static int kvmppc_handle_dcr_read(CPUPPCState *env, uint32_t dcrn, uint32_t *data)
{
    if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)
        fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);

    return 0;
}

static int kvmppc_handle_dcr_write(CPUPPCState *env, uint32_t dcrn, uint32_t data)
{
    if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)
        fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);

    return 0;
}

int kvm_arch_handle_exit(CPUPPCState *env, struct kvm_run *run)
{
    int ret;

    switch (run->exit_reason) {
    case KVM_EXIT_DCR:
        if (run->dcr.is_write) {
            dprintf("handle dcr write\n");
            ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);
        } else {
            dprintf("handle dcr read\n");
            ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);
        }
        break;
    case KVM_EXIT_HLT:
        dprintf("handle halt\n");
        ret = kvmppc_handle_halt(env);
        break;
#ifdef CONFIG_PSERIES
    case KVM_EXIT_PAPR_HCALL:
        dprintf("handle PAPR hypercall\n");
        run->papr_hcall.ret = spapr_hypercall(env, run->papr_hcall.nr,
                                              run->papr_hcall.args);
        ret = 1;
        break;
#endif
    default:
        fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
        ret = -1;
        break;
    }

    return ret;
}

static int read_cpuinfo(const char *field, char *value, int len)
{
    FILE *f;
    int ret = -1;
    int field_len = strlen(field);
    char line[512];

    f = fopen("/proc/cpuinfo", "r");
    if (!f) {
        return -1;
    }

    do {
        if(!fgets(line, sizeof(line), f)) {
            break;
        }
        if (!strncmp(line, field, field_len)) {
            strncpy(value, line, len);
            ret = 0;
            break;
        }
    } while(*line);

    fclose(f);

    return ret;
}

uint32_t kvmppc_get_tbfreq(void)
{
    char line[512];
    char *ns;
    uint32_t retval = get_ticks_per_sec();

    if (read_cpuinfo("timebase", line, sizeof(line))) {
        return retval;
    }

    if (!(ns = strchr(line, ':'))) {
        return retval;
    }

    ns++;

    retval = atoi(ns);
    return retval;
}

/* Try to find a device tree node for a CPU with clock-frequency property */
static int kvmppc_find_cpu_dt(char *buf, int buf_len)
{
    struct dirent *dirp;
    DIR *dp;

    if ((dp = opendir(PROC_DEVTREE_CPU)) == NULL) {
        printf("Can't open directory " PROC_DEVTREE_CPU "\n");
        return -1;
    }

    buf[0] = '\0';
    while ((dirp = readdir(dp)) != NULL) {
        FILE *f;
        snprintf(buf, buf_len, "%s%s/clock-frequency", PROC_DEVTREE_CPU,
                 dirp->d_name);
        f = fopen(buf, "r");
        if (f) {
            snprintf(buf, buf_len, "%s%s", PROC_DEVTREE_CPU, dirp->d_name);
            fclose(f);
            break;
        }
        buf[0] = '\0';
    }
    closedir(dp);
    if (buf[0] == '\0') {
        printf("Unknown host!\n");
        return -1;
    }

    return 0;
}

/* Read a CPU node property from the host device tree that's a single
 * integer (32-bit or 64-bit).  Returns 0 if anything goes wrong
 * (can't find or open the property, or doesn't understand the
 * format) */
static uint64_t kvmppc_read_int_cpu_dt(const char *propname)
{
    char buf[PATH_MAX];
    union {
        uint32_t v32;
        uint64_t v64;
    } u;
    FILE *f;
    int len;

    if (kvmppc_find_cpu_dt(buf, sizeof(buf))) {
        return -1;
    }

    strncat(buf, "/", sizeof(buf) - strlen(buf));
    strncat(buf, propname, sizeof(buf) - strlen(buf));

    f = fopen(buf, "rb");
    if (!f) {
        return -1;
    }

    len = fread(&u, 1, sizeof(u), f);
    fclose(f);
    switch (len) {
    case 4:
        /* property is a 32-bit quantity */
        return be32_to_cpu(u.v32);
    case 8:
        return be64_to_cpu(u.v64);
    }

    return 0;
}

uint64_t kvmppc_get_clockfreq(void)
{
    return kvmppc_read_int_cpu_dt("clock-frequency");
}

uint32_t kvmppc_get_vmx(void)
{
    return kvmppc_read_int_cpu_dt("ibm,vmx");
}

uint32_t kvmppc_get_dfp(void)
{
    return kvmppc_read_int_cpu_dt("ibm,dfp");
}

int kvmppc_get_hypercall(CPUPPCState *env, uint8_t *buf, int buf_len)
{
    uint32_t *hc = (uint32_t*)buf;

    struct kvm_ppc_pvinfo pvinfo;

    if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_GET_PVINFO) &&
        !kvm_vm_ioctl(env->kvm_state, KVM_PPC_GET_PVINFO, &pvinfo)) {
        memcpy(buf, pvinfo.hcall, buf_len);

        return 0;
    }

    /*
     * Fallback to always fail hypercalls:
     *
     *     li r3, -1
     *     nop
     *     nop
     *     nop
     */

    hc[0] = 0x3860ffff;
    hc[1] = 0x60000000;
    hc[2] = 0x60000000;
    hc[3] = 0x60000000;

    return 0;
}

void kvmppc_set_papr(CPUPPCState *env)
{
    struct kvm_enable_cap cap = {};
    struct kvm_one_reg reg = {};
    struct kvm_sregs sregs = {};
    int ret;
    uint64_t hior = env->spr[SPR_HIOR];

    cap.cap = KVM_CAP_PPC_PAPR;
    ret = kvm_vcpu_ioctl(env, KVM_ENABLE_CAP, &cap);

    if (ret) {
        goto fail;
    }

    /*
     * XXX We set HIOR here. It really should be a qdev property of
     *     the CPU node, but we don't have CPUs converted to qdev yet.
     *
     *     Once we have qdev CPUs, move HIOR to a qdev property and
     *     remove this chunk.
     */
    reg.id = KVM_REG_PPC_HIOR;
    reg.addr = (uintptr_t)&hior;
    ret = kvm_vcpu_ioctl(env, KVM_SET_ONE_REG, &reg);
    if (ret) {
        fprintf(stderr, "Couldn't set HIOR. Maybe you're running an old \n"
                        "kernel with support for HV KVM but no PAPR PR \n"
                        "KVM in which case things will work. If they don't \n"
                        "please update your host kernel!\n");
    }

    /* Set SDR1 so kernel space finds the HTAB */
    ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
    if (ret) {
        goto fail;
    }

    sregs.u.s.sdr1 = env->spr[SPR_SDR1];

    ret = kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
    if (ret) {
        goto fail;
    }

    return;

fail:
    cpu_abort(env, "This KVM version does not support PAPR\n");
}

int kvmppc_smt_threads(void)
{
    return cap_ppc_smt ? cap_ppc_smt : 1;
}

off_t kvmppc_alloc_rma(const char *name, MemoryRegion *sysmem)
{
    void *rma;
    off_t size;
    int fd;
    struct kvm_allocate_rma ret;
    MemoryRegion *rma_region;

    /* If cap_ppc_rma == 0, contiguous RMA allocation is not supported
     * if cap_ppc_rma == 1, contiguous RMA allocation is supported, but
     *                      not necessary on this hardware
     * if cap_ppc_rma == 2, contiguous RMA allocation is needed on this hardware
     *
     * FIXME: We should allow the user to force contiguous RMA
     * allocation in the cap_ppc_rma==1 case.
     */
    if (cap_ppc_rma < 2) {
        return 0;
    }

    fd = kvm_vm_ioctl(kvm_state, KVM_ALLOCATE_RMA, &ret);
    if (fd < 0) {
        fprintf(stderr, "KVM: Error on KVM_ALLOCATE_RMA: %s\n",
                strerror(errno));
        return -1;
    }

    size = MIN(ret.rma_size, 256ul << 20);

    rma = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    if (rma == MAP_FAILED) {
        fprintf(stderr, "KVM: Error mapping RMA: %s\n", strerror(errno));
        return -1;
    };

    rma_region = g_new(MemoryRegion, 1);
    memory_region_init_ram_ptr(rma_region, name, size, rma);
    vmstate_register_ram_global(rma_region);
    memory_region_add_subregion(sysmem, 0, rma_region);

    return size;
}

void *kvmppc_create_spapr_tce(uint32_t liobn, uint32_t window_size, int *pfd)
{
    struct kvm_create_spapr_tce args = {
        .liobn = liobn,
        .window_size = window_size,
    };
    long len;
    int fd;
    void *table;

    /* Must set fd to -1 so we don't try to munmap when called for
     * destroying the table, which the upper layers -will- do
     */
    *pfd = -1;
    if (!cap_spapr_tce) {
        return NULL;
    }

    fd = kvm_vm_ioctl(kvm_state, KVM_CREATE_SPAPR_TCE, &args);
    if (fd < 0) {
        fprintf(stderr, "KVM: Failed to create TCE table for liobn 0x%x\n",
                liobn);
        return NULL;
    }

    len = (window_size / SPAPR_VIO_TCE_PAGE_SIZE) * sizeof(VIOsPAPR_RTCE);
    /* FIXME: round this up to page size */

    table = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
    if (table == MAP_FAILED) {
        fprintf(stderr, "KVM: Failed to map TCE table for liobn 0x%x\n",
                liobn);
        close(fd);
        return NULL;
    }

    *pfd = fd;
    return table;
}

int kvmppc_remove_spapr_tce(void *table, int fd, uint32_t window_size)
{
    long len;

    if (fd < 0) {
        return -1;
    }

    len = (window_size / SPAPR_VIO_TCE_PAGE_SIZE)*sizeof(VIOsPAPR_RTCE);
    if ((munmap(table, len) < 0) ||
        (close(fd) < 0)) {
        fprintf(stderr, "KVM: Unexpected error removing TCE table: %s",
                strerror(errno));
        /* Leak the table */
    }

    return 0;
}

static inline uint32_t mfpvr(void)
{
    uint32_t pvr;

    asm ("mfpvr %0"
         : "=r"(pvr));
    return pvr;
}

static void alter_insns(uint64_t *word, uint64_t flags, bool on)
{
    if (on) {
        *word |= flags;
    } else {
        *word &= ~flags;
    }
}

const ppc_def_t *kvmppc_host_cpu_def(void)
{
    uint32_t host_pvr = mfpvr();
    const ppc_def_t *base_spec;
    ppc_def_t *spec;
    uint32_t vmx = kvmppc_get_vmx();
    uint32_t dfp = kvmppc_get_dfp();

    base_spec = ppc_find_by_pvr(host_pvr);

    spec = g_malloc0(sizeof(*spec));
    memcpy(spec, base_spec, sizeof(*spec));

    /* Now fix up the spec with information we can query from the host */

    if (vmx != -1) {
        /* Only override when we know what the host supports */
        alter_insns(&spec->insns_flags, PPC_ALTIVEC, vmx > 0);
        alter_insns(&spec->insns_flags2, PPC2_VSX, vmx > 1);
    }
    if (dfp != -1) {
        /* Only override when we know what the host supports */
        alter_insns(&spec->insns_flags2, PPC2_DFP, dfp);
    }

    return spec;
}

int kvmppc_fixup_cpu(CPUPPCState *env)
{
    int smt;

    /* Adjust cpu index for SMT */
    smt = kvmppc_smt_threads();
    env->cpu_index = (env->cpu_index / smp_threads) * smt
        + (env->cpu_index % smp_threads);

    return 0;
}


bool kvm_arch_stop_on_emulation_error(CPUPPCState *env)
{
    return true;
}

int kvm_arch_on_sigbus_vcpu(CPUPPCState *env, int code, void *addr)
{
    return 1;
}

int kvm_arch_on_sigbus(int code, void *addr)
{
    return 1;
}