Bootlin logo

Elixir Cross Referencer

   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
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
/*
 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *    Paul Mackerras <paulus@au1.ibm.com>
 *    Alexander Graf <agraf@suse.de>
 *    Kevin Wolf <mail@kevin-wolf.de>
 *
 * Description: KVM functions specific to running on Book 3S
 * processors in hypervisor mode (specifically POWER7 and later).
 *
 * This file is derived from arch/powerpc/kvm/book3s.c,
 * by Alexander Graf <agraf@suse.de>.
 *
 * 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.
 */

#include <linux/kvm_host.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpumask.h>
#include <linux/spinlock.h>
#include <linux/page-flags.h>

#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/lppaca.h>
#include <asm/processor.h>
#include <asm/cputhreads.h>
#include <asm/page.h>
#include <asm/hvcall.h>
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>

/*
 * For now, limit memory to 64GB and require it to be large pages.
 * This value is chosen because it makes the ram_pginfo array be
 * 64kB in size, which is about as large as we want to be trying
 * to allocate with kmalloc.
 */
#define MAX_MEM_ORDER		36

#define LARGE_PAGE_ORDER	24	/* 16MB pages */

/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */

static void kvmppc_end_cede(struct kvm_vcpu *vcpu);

void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
	local_paca->kvm_hstate.kvm_vcpu = vcpu;
	local_paca->kvm_hstate.kvm_vcore = vcpu->arch.vcore;
}

void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
{
}

void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
{
	vcpu->arch.shregs.msr = msr;
	kvmppc_end_cede(vcpu);
}

void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
{
	vcpu->arch.pvr = pvr;
}

void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
{
	int r;

	pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
	pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
	       vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
	for (r = 0; r < 16; ++r)
		pr_err("r%2d = %.16lx  r%d = %.16lx\n",
		       r, kvmppc_get_gpr(vcpu, r),
		       r+16, kvmppc_get_gpr(vcpu, r+16));
	pr_err("ctr = %.16lx  lr  = %.16lx\n",
	       vcpu->arch.ctr, vcpu->arch.lr);
	pr_err("srr0 = %.16llx srr1 = %.16llx\n",
	       vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
	pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
	       vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
	pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
	       vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
	pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
	       vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
	pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
	pr_err("fault dar = %.16lx dsisr = %.8x\n",
	       vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
	pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
	for (r = 0; r < vcpu->arch.slb_max; ++r)
		pr_err("  ESID = %.16llx VSID = %.16llx\n",
		       vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
	pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
	       vcpu->kvm->arch.lpcr, vcpu->kvm->arch.sdr1,
	       vcpu->arch.last_inst);
}

struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
	int r;
	struct kvm_vcpu *v, *ret = NULL;

	mutex_lock(&kvm->lock);
	kvm_for_each_vcpu(r, v, kvm) {
		if (v->vcpu_id == id) {
			ret = v;
			break;
		}
	}
	mutex_unlock(&kvm->lock);
	return ret;
}

static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
	vpa->shared_proc = 1;
	vpa->yield_count = 1;
}

static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
				       unsigned long flags,
				       unsigned long vcpuid, unsigned long vpa)
{
	struct kvm *kvm = vcpu->kvm;
	unsigned long pg_index, ra, len;
	unsigned long pg_offset;
	void *va;
	struct kvm_vcpu *tvcpu;

	tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
	if (!tvcpu)
		return H_PARAMETER;

	flags >>= 63 - 18;
	flags &= 7;
	if (flags == 0 || flags == 4)
		return H_PARAMETER;
	if (flags < 4) {
		if (vpa & 0x7f)
			return H_PARAMETER;
		/* registering new area; convert logical addr to real */
		pg_index = vpa >> kvm->arch.ram_porder;
		pg_offset = vpa & (kvm->arch.ram_psize - 1);
		if (pg_index >= kvm->arch.ram_npages)
			return H_PARAMETER;
		if (kvm->arch.ram_pginfo[pg_index].pfn == 0)
			return H_PARAMETER;
		ra = kvm->arch.ram_pginfo[pg_index].pfn << PAGE_SHIFT;
		ra |= pg_offset;
		va = __va(ra);
		if (flags <= 1)
			len = *(unsigned short *)(va + 4);
		else
			len = *(unsigned int *)(va + 4);
		if (pg_offset + len > kvm->arch.ram_psize)
			return H_PARAMETER;
		switch (flags) {
		case 1:		/* register VPA */
			if (len < 640)
				return H_PARAMETER;
			tvcpu->arch.vpa = va;
			init_vpa(vcpu, va);
			break;
		case 2:		/* register DTL */
			if (len < 48)
				return H_PARAMETER;
			if (!tvcpu->arch.vpa)
				return H_RESOURCE;
			len -= len % 48;
			tvcpu->arch.dtl = va;
			tvcpu->arch.dtl_end = va + len;
			break;
		case 3:		/* register SLB shadow buffer */
			if (len < 8)
				return H_PARAMETER;
			if (!tvcpu->arch.vpa)
				return H_RESOURCE;
			tvcpu->arch.slb_shadow = va;
			len = (len - 16) / 16;
			tvcpu->arch.slb_shadow = va;
			break;
		}
	} else {
		switch (flags) {
		case 5:		/* unregister VPA */
			if (tvcpu->arch.slb_shadow || tvcpu->arch.dtl)
				return H_RESOURCE;
			tvcpu->arch.vpa = NULL;
			break;
		case 6:		/* unregister DTL */
			tvcpu->arch.dtl = NULL;
			break;
		case 7:		/* unregister SLB shadow buffer */
			tvcpu->arch.slb_shadow = NULL;
			break;
		}
	}
	return H_SUCCESS;
}

int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
	unsigned long req = kvmppc_get_gpr(vcpu, 3);
	unsigned long target, ret = H_SUCCESS;
	struct kvm_vcpu *tvcpu;

	switch (req) {
	case H_CEDE:
		break;
	case H_PROD:
		target = kvmppc_get_gpr(vcpu, 4);
		tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
		if (!tvcpu) {
			ret = H_PARAMETER;
			break;
		}
		tvcpu->arch.prodded = 1;
		smp_mb();
		if (vcpu->arch.ceded) {
			if (waitqueue_active(&vcpu->wq)) {
				wake_up_interruptible(&vcpu->wq);
				vcpu->stat.halt_wakeup++;
			}
		}
		break;
	case H_CONFER:
		break;
	case H_REGISTER_VPA:
		ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
					kvmppc_get_gpr(vcpu, 5),
					kvmppc_get_gpr(vcpu, 6));
		break;
	default:
		return RESUME_HOST;
	}
	kvmppc_set_gpr(vcpu, 3, ret);
	vcpu->arch.hcall_needed = 0;
	return RESUME_GUEST;
}

static int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
			      struct task_struct *tsk)
{
	int r = RESUME_HOST;

	vcpu->stat.sum_exits++;

	run->exit_reason = KVM_EXIT_UNKNOWN;
	run->ready_for_interrupt_injection = 1;
	switch (vcpu->arch.trap) {
	/* We're good on these - the host merely wanted to get our attention */
	case BOOK3S_INTERRUPT_HV_DECREMENTER:
		vcpu->stat.dec_exits++;
		r = RESUME_GUEST;
		break;
	case BOOK3S_INTERRUPT_EXTERNAL:
		vcpu->stat.ext_intr_exits++;
		r = RESUME_GUEST;
		break;
	case BOOK3S_INTERRUPT_PERFMON:
		r = RESUME_GUEST;
		break;
	case BOOK3S_INTERRUPT_PROGRAM:
	{
		ulong flags;
		/*
		 * Normally program interrupts are delivered directly
		 * to the guest by the hardware, but we can get here
		 * as a result of a hypervisor emulation interrupt
		 * (e40) getting turned into a 700 by BML RTAS.
		 */
		flags = vcpu->arch.shregs.msr & 0x1f0000ull;
		kvmppc_core_queue_program(vcpu, flags);
		r = RESUME_GUEST;
		break;
	}
	case BOOK3S_INTERRUPT_SYSCALL:
	{
		/* hcall - punt to userspace */
		int i;

		if (vcpu->arch.shregs.msr & MSR_PR) {
			/* sc 1 from userspace - reflect to guest syscall */
			kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL);
			r = RESUME_GUEST;
			break;
		}
		run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
		for (i = 0; i < 9; ++i)
			run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
		run->exit_reason = KVM_EXIT_PAPR_HCALL;
		vcpu->arch.hcall_needed = 1;
		r = RESUME_HOST;
		break;
	}
	/*
	 * We get these next two if the guest does a bad real-mode access,
	 * as we have enabled VRMA (virtualized real mode area) mode in the
	 * LPCR.  We just generate an appropriate DSI/ISI to the guest.
	 */
	case BOOK3S_INTERRUPT_H_DATA_STORAGE:
		vcpu->arch.shregs.dsisr = vcpu->arch.fault_dsisr;
		vcpu->arch.shregs.dar = vcpu->arch.fault_dar;
		kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE, 0);
		r = RESUME_GUEST;
		break;
	case BOOK3S_INTERRUPT_H_INST_STORAGE:
		kvmppc_inject_interrupt(vcpu, BOOK3S_INTERRUPT_INST_STORAGE,
					0x08000000);
		r = RESUME_GUEST;
		break;
	/*
	 * This occurs if the guest executes an illegal instruction.
	 * We just generate a program interrupt to the guest, since
	 * we don't emulate any guest instructions at this stage.
	 */
	case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
		kvmppc_core_queue_program(vcpu, 0x80000);
		r = RESUME_GUEST;
		break;
	default:
		kvmppc_dump_regs(vcpu);
		printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
			vcpu->arch.trap, kvmppc_get_pc(vcpu),
			vcpu->arch.shregs.msr);
		r = RESUME_HOST;
		BUG();
		break;
	}

	return r;
}

int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs)
{
	int i;

	sregs->pvr = vcpu->arch.pvr;

	memset(sregs, 0, sizeof(struct kvm_sregs));
	for (i = 0; i < vcpu->arch.slb_max; i++) {
		sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
		sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
	}

	return 0;
}

int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs)
{
	int i, j;

	kvmppc_set_pvr(vcpu, sregs->pvr);

	j = 0;
	for (i = 0; i < vcpu->arch.slb_nr; i++) {
		if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
			vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
			vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
			++j;
		}
	}
	vcpu->arch.slb_max = j;

	return 0;
}

int kvmppc_core_check_processor_compat(void)
{
	if (cpu_has_feature(CPU_FTR_HVMODE))
		return 0;
	return -EIO;
}

struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
{
	struct kvm_vcpu *vcpu;
	int err = -EINVAL;
	int core;
	struct kvmppc_vcore *vcore;

	core = id / threads_per_core;
	if (core >= KVM_MAX_VCORES)
		goto out;

	err = -ENOMEM;
	vcpu = kzalloc(sizeof(struct kvm_vcpu), GFP_KERNEL);
	if (!vcpu)
		goto out;

	err = kvm_vcpu_init(vcpu, kvm, id);
	if (err)
		goto free_vcpu;

	vcpu->arch.shared = &vcpu->arch.shregs;
	vcpu->arch.last_cpu = -1;
	vcpu->arch.mmcr[0] = MMCR0_FC;
	vcpu->arch.ctrl = CTRL_RUNLATCH;
	/* default to host PVR, since we can't spoof it */
	vcpu->arch.pvr = mfspr(SPRN_PVR);
	kvmppc_set_pvr(vcpu, vcpu->arch.pvr);

	kvmppc_mmu_book3s_hv_init(vcpu);

	/*
	 * We consider the vcpu stopped until we see the first run ioctl for it.
	 */
	vcpu->arch.state = KVMPPC_VCPU_STOPPED;

	init_waitqueue_head(&vcpu->arch.cpu_run);

	mutex_lock(&kvm->lock);
	vcore = kvm->arch.vcores[core];
	if (!vcore) {
		vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);
		if (vcore) {
			INIT_LIST_HEAD(&vcore->runnable_threads);
			spin_lock_init(&vcore->lock);
			init_waitqueue_head(&vcore->wq);
		}
		kvm->arch.vcores[core] = vcore;
	}
	mutex_unlock(&kvm->lock);

	if (!vcore)
		goto free_vcpu;

	spin_lock(&vcore->lock);
	++vcore->num_threads;
	spin_unlock(&vcore->lock);
	vcpu->arch.vcore = vcore;

	vcpu->arch.cpu_type = KVM_CPU_3S_64;
	kvmppc_sanity_check(vcpu);

	return vcpu;

free_vcpu:
	kfree(vcpu);
out:
	return ERR_PTR(err);
}

void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
{
	kvm_vcpu_uninit(vcpu);
	kfree(vcpu);
}

static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
{
	unsigned long dec_nsec, now;

	now = get_tb();
	if (now > vcpu->arch.dec_expires) {
		/* decrementer has already gone negative */
		kvmppc_core_queue_dec(vcpu);
		kvmppc_core_deliver_interrupts(vcpu);
		return;
	}
	dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
		   / tb_ticks_per_sec;
	hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
		      HRTIMER_MODE_REL);
	vcpu->arch.timer_running = 1;
}

static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
{
	vcpu->arch.ceded = 0;
	if (vcpu->arch.timer_running) {
		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
		vcpu->arch.timer_running = 0;
	}
}

extern int __kvmppc_vcore_entry(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
extern void xics_wake_cpu(int cpu);

static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
				   struct kvm_vcpu *vcpu)
{
	struct kvm_vcpu *v;

	if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
		return;
	vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
	--vc->n_runnable;
	++vc->n_busy;
	/* decrement the physical thread id of each following vcpu */
	v = vcpu;
	list_for_each_entry_continue(v, &vc->runnable_threads, arch.run_list)
		--v->arch.ptid;
	list_del(&vcpu->arch.run_list);
}

static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
{
	int cpu;
	struct paca_struct *tpaca;
	struct kvmppc_vcore *vc = vcpu->arch.vcore;

	if (vcpu->arch.timer_running) {
		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
		vcpu->arch.timer_running = 0;
	}
	cpu = vc->pcpu + vcpu->arch.ptid;
	tpaca = &paca[cpu];
	tpaca->kvm_hstate.kvm_vcpu = vcpu;
	tpaca->kvm_hstate.kvm_vcore = vc;
	tpaca->kvm_hstate.napping = 0;
	vcpu->cpu = vc->pcpu;
	smp_wmb();
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
	if (vcpu->arch.ptid) {
		tpaca->cpu_start = 0x80;
		wmb();
		xics_wake_cpu(cpu);
		++vc->n_woken;
	}
#endif
}

static void kvmppc_wait_for_nap(struct kvmppc_vcore *vc)
{
	int i;

	HMT_low();
	i = 0;
	while (vc->nap_count < vc->n_woken) {
		if (++i >= 1000000) {
			pr_err("kvmppc_wait_for_nap timeout %d %d\n",
			       vc->nap_count, vc->n_woken);
			break;
		}
		cpu_relax();
	}
	HMT_medium();
}

/*
 * Check that we are on thread 0 and that any other threads in
 * this core are off-line.
 */
static int on_primary_thread(void)
{
	int cpu = smp_processor_id();
	int thr = cpu_thread_in_core(cpu);

	if (thr)
		return 0;
	while (++thr < threads_per_core)
		if (cpu_online(cpu + thr))
			return 0;
	return 1;
}

/*
 * Run a set of guest threads on a physical core.
 * Called with vc->lock held.
 */
static int kvmppc_run_core(struct kvmppc_vcore *vc)
{
	struct kvm_vcpu *vcpu, *vcpu0, *vnext;
	long ret;
	u64 now;
	int ptid;

	/* don't start if any threads have a signal pending */
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
		if (signal_pending(vcpu->arch.run_task))
			return 0;

	/*
	 * Make sure we are running on thread 0, and that
	 * secondary threads are offline.
	 * XXX we should also block attempts to bring any
	 * secondary threads online.
	 */
	if (threads_per_core > 1 && !on_primary_thread()) {
		list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
			vcpu->arch.ret = -EBUSY;
		goto out;
	}

	/*
	 * Assign physical thread IDs, first to non-ceded vcpus
	 * and then to ceded ones.
	 */
	ptid = 0;
	vcpu0 = NULL;
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
		if (!vcpu->arch.ceded) {
			if (!ptid)
				vcpu0 = vcpu;
			vcpu->arch.ptid = ptid++;
		}
	}
	if (!vcpu0)
		return 0;		/* nothing to run */
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
		if (vcpu->arch.ceded)
			vcpu->arch.ptid = ptid++;

	vc->n_woken = 0;
	vc->nap_count = 0;
	vc->entry_exit_count = 0;
	vc->vcore_state = VCORE_RUNNING;
	vc->in_guest = 0;
	vc->pcpu = smp_processor_id();
	vc->napping_threads = 0;
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
		kvmppc_start_thread(vcpu);

	preempt_disable();
	spin_unlock(&vc->lock);

	kvm_guest_enter();
	__kvmppc_vcore_entry(NULL, vcpu0);

	spin_lock(&vc->lock);
	/* disable sending of IPIs on virtual external irqs */
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
		vcpu->cpu = -1;
	/* wait for secondary threads to finish writing their state to memory */
	if (vc->nap_count < vc->n_woken)
		kvmppc_wait_for_nap(vc);
	/* prevent other vcpu threads from doing kvmppc_start_thread() now */
	vc->vcore_state = VCORE_EXITING;
	spin_unlock(&vc->lock);

	/* make sure updates to secondary vcpu structs are visible now */
	smp_mb();
	kvm_guest_exit();

	preempt_enable();
	kvm_resched(vcpu);

	now = get_tb();
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
		/* cancel pending dec exception if dec is positive */
		if (now < vcpu->arch.dec_expires &&
		    kvmppc_core_pending_dec(vcpu))
			kvmppc_core_dequeue_dec(vcpu);

		ret = RESUME_GUEST;
		if (vcpu->arch.trap)
			ret = kvmppc_handle_exit(vcpu->arch.kvm_run, vcpu,
						 vcpu->arch.run_task);

		vcpu->arch.ret = ret;
		vcpu->arch.trap = 0;

		if (vcpu->arch.ceded) {
			if (ret != RESUME_GUEST)
				kvmppc_end_cede(vcpu);
			else
				kvmppc_set_timer(vcpu);
		}
	}

	spin_lock(&vc->lock);
 out:
	vc->vcore_state = VCORE_INACTIVE;
	list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
				 arch.run_list) {
		if (vcpu->arch.ret != RESUME_GUEST) {
			kvmppc_remove_runnable(vc, vcpu);
			wake_up(&vcpu->arch.cpu_run);
		}
	}

	return 1;
}

/*
 * Wait for some other vcpu thread to execute us, and
 * wake us up when we need to handle something in the host.
 */
static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
{
	DEFINE_WAIT(wait);

	prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
	if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
		schedule();
	finish_wait(&vcpu->arch.cpu_run, &wait);
}

/*
 * All the vcpus in this vcore are idle, so wait for a decrementer
 * or external interrupt to one of the vcpus.  vc->lock is held.
 */
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
	DEFINE_WAIT(wait);
	struct kvm_vcpu *v;
	int all_idle = 1;

	prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
	vc->vcore_state = VCORE_SLEEPING;
	spin_unlock(&vc->lock);
	list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
		if (!v->arch.ceded || v->arch.pending_exceptions) {
			all_idle = 0;
			break;
		}
	}
	if (all_idle)
		schedule();
	finish_wait(&vc->wq, &wait);
	spin_lock(&vc->lock);
	vc->vcore_state = VCORE_INACTIVE;
}

static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
	int n_ceded;
	int prev_state;
	struct kvmppc_vcore *vc;
	struct kvm_vcpu *v, *vn;

	kvm_run->exit_reason = 0;
	vcpu->arch.ret = RESUME_GUEST;
	vcpu->arch.trap = 0;

	/*
	 * Synchronize with other threads in this virtual core
	 */
	vc = vcpu->arch.vcore;
	spin_lock(&vc->lock);
	vcpu->arch.ceded = 0;
	vcpu->arch.run_task = current;
	vcpu->arch.kvm_run = kvm_run;
	prev_state = vcpu->arch.state;
	vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
	list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
	++vc->n_runnable;

	/*
	 * This happens the first time this is called for a vcpu.
	 * If the vcore is already running, we may be able to start
	 * this thread straight away and have it join in.
	 */
	if (prev_state == KVMPPC_VCPU_STOPPED) {
		if (vc->vcore_state == VCORE_RUNNING &&
		    VCORE_EXIT_COUNT(vc) == 0) {
			vcpu->arch.ptid = vc->n_runnable - 1;
			kvmppc_start_thread(vcpu);
		}

	} else if (prev_state == KVMPPC_VCPU_BUSY_IN_HOST)
		--vc->n_busy;

	while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
	       !signal_pending(current)) {
		if (vc->n_busy || vc->vcore_state != VCORE_INACTIVE) {
			spin_unlock(&vc->lock);
			kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
			spin_lock(&vc->lock);
			continue;
		}
		n_ceded = 0;
		list_for_each_entry(v, &vc->runnable_threads, arch.run_list)
			n_ceded += v->arch.ceded;
		if (n_ceded == vc->n_runnable)
			kvmppc_vcore_blocked(vc);
		else
			kvmppc_run_core(vc);

		list_for_each_entry_safe(v, vn, &vc->runnable_threads,
					 arch.run_list) {
			kvmppc_core_deliver_interrupts(v);
			if (signal_pending(v->arch.run_task)) {
				kvmppc_remove_runnable(vc, v);
				v->stat.signal_exits++;
				v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
				v->arch.ret = -EINTR;
				wake_up(&v->arch.cpu_run);
			}
		}
	}

	if (signal_pending(current)) {
		if (vc->vcore_state == VCORE_RUNNING ||
		    vc->vcore_state == VCORE_EXITING) {
			spin_unlock(&vc->lock);
			kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
			spin_lock(&vc->lock);
		}
		if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
			kvmppc_remove_runnable(vc, vcpu);
			vcpu->stat.signal_exits++;
			kvm_run->exit_reason = KVM_EXIT_INTR;
			vcpu->arch.ret = -EINTR;
		}
	}

	spin_unlock(&vc->lock);
	return vcpu->arch.ret;
}

int kvmppc_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
	int r;

	if (!vcpu->arch.sane) {
		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
		return -EINVAL;
	}

	/* No need to go into the guest when all we'll do is come back out */
	if (signal_pending(current)) {
		run->exit_reason = KVM_EXIT_INTR;
		return -EINTR;
	}

	/* On PPC970, check that we have an RMA region */
	if (!vcpu->kvm->arch.rma && cpu_has_feature(CPU_FTR_ARCH_201))
		return -EPERM;

	flush_fp_to_thread(current);
	flush_altivec_to_thread(current);
	flush_vsx_to_thread(current);
	vcpu->arch.wqp = &vcpu->arch.vcore->wq;

	do {
		r = kvmppc_run_vcpu(run, vcpu);

		if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
		    !(vcpu->arch.shregs.msr & MSR_PR)) {
			r = kvmppc_pseries_do_hcall(vcpu);
			kvmppc_core_deliver_interrupts(vcpu);
		}
	} while (r == RESUME_GUEST);
	return r;
}

static long kvmppc_stt_npages(unsigned long window_size)
{
	return ALIGN((window_size >> SPAPR_TCE_SHIFT)
		     * sizeof(u64), PAGE_SIZE) / PAGE_SIZE;
}

static void release_spapr_tce_table(struct kvmppc_spapr_tce_table *stt)
{
	struct kvm *kvm = stt->kvm;
	int i;

	mutex_lock(&kvm->lock);
	list_del(&stt->list);
	for (i = 0; i < kvmppc_stt_npages(stt->window_size); i++)
		__free_page(stt->pages[i]);
	kfree(stt);
	mutex_unlock(&kvm->lock);

	kvm_put_kvm(kvm);
}

static int kvm_spapr_tce_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct kvmppc_spapr_tce_table *stt = vma->vm_file->private_data;
	struct page *page;

	if (vmf->pgoff >= kvmppc_stt_npages(stt->window_size))
		return VM_FAULT_SIGBUS;

	page = stt->pages[vmf->pgoff];
	get_page(page);
	vmf->page = page;
	return 0;
}

static const struct vm_operations_struct kvm_spapr_tce_vm_ops = {
	.fault = kvm_spapr_tce_fault,
};

static int kvm_spapr_tce_mmap(struct file *file, struct vm_area_struct *vma)
{
	vma->vm_ops = &kvm_spapr_tce_vm_ops;
	return 0;
}

static int kvm_spapr_tce_release(struct inode *inode, struct file *filp)
{
	struct kvmppc_spapr_tce_table *stt = filp->private_data;

	release_spapr_tce_table(stt);
	return 0;
}

static struct file_operations kvm_spapr_tce_fops = {
	.mmap           = kvm_spapr_tce_mmap,
	.release	= kvm_spapr_tce_release,
};

long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm,
				   struct kvm_create_spapr_tce *args)
{
	struct kvmppc_spapr_tce_table *stt = NULL;
	long npages;
	int ret = -ENOMEM;
	int i;

	/* Check this LIOBN hasn't been previously allocated */
	list_for_each_entry(stt, &kvm->arch.spapr_tce_tables, list) {
		if (stt->liobn == args->liobn)
			return -EBUSY;
	}

	npages = kvmppc_stt_npages(args->window_size);

	stt = kzalloc(sizeof(*stt) + npages* sizeof(struct page *),
		      GFP_KERNEL);
	if (!stt)
		goto fail;

	stt->liobn = args->liobn;
	stt->window_size = args->window_size;
	stt->kvm = kvm;

	for (i = 0; i < npages; i++) {
		stt->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO);
		if (!stt->pages[i])
			goto fail;
	}

	kvm_get_kvm(kvm);

	mutex_lock(&kvm->lock);
	list_add(&stt->list, &kvm->arch.spapr_tce_tables);

	mutex_unlock(&kvm->lock);

	return anon_inode_getfd("kvm-spapr-tce", &kvm_spapr_tce_fops,
				stt, O_RDWR);

fail:
	if (stt) {
		for (i = 0; i < npages; i++)
			if (stt->pages[i])
				__free_page(stt->pages[i]);

		kfree(stt);
	}
	return ret;
}

/* Work out RMLS (real mode limit selector) field value for a given RMA size.
   Assumes POWER7 or PPC970. */
static inline int lpcr_rmls(unsigned long rma_size)
{
	switch (rma_size) {
	case 32ul << 20:	/* 32 MB */
		if (cpu_has_feature(CPU_FTR_ARCH_206))
			return 8;	/* only supported on POWER7 */
		return -1;
	case 64ul << 20:	/* 64 MB */
		return 3;
	case 128ul << 20:	/* 128 MB */
		return 7;
	case 256ul << 20:	/* 256 MB */
		return 4;
	case 1ul << 30:		/* 1 GB */
		return 2;
	case 16ul << 30:	/* 16 GB */
		return 1;
	case 256ul << 30:	/* 256 GB */
		return 0;
	default:
		return -1;
	}
}

static int kvm_rma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
	struct kvmppc_rma_info *ri = vma->vm_file->private_data;
	struct page *page;

	if (vmf->pgoff >= ri->npages)
		return VM_FAULT_SIGBUS;

	page = pfn_to_page(ri->base_pfn + vmf->pgoff);
	get_page(page);
	vmf->page = page;
	return 0;
}

static const struct vm_operations_struct kvm_rma_vm_ops = {
	.fault = kvm_rma_fault,
};

static int kvm_rma_mmap(struct file *file, struct vm_area_struct *vma)
{
	vma->vm_flags |= VM_RESERVED;
	vma->vm_ops = &kvm_rma_vm_ops;
	return 0;
}

static int kvm_rma_release(struct inode *inode, struct file *filp)
{
	struct kvmppc_rma_info *ri = filp->private_data;

	kvm_release_rma(ri);
	return 0;
}

static struct file_operations kvm_rma_fops = {
	.mmap           = kvm_rma_mmap,
	.release	= kvm_rma_release,
};

long kvm_vm_ioctl_allocate_rma(struct kvm *kvm, struct kvm_allocate_rma *ret)
{
	struct kvmppc_rma_info *ri;
	long fd;

	ri = kvm_alloc_rma();
	if (!ri)
		return -ENOMEM;

	fd = anon_inode_getfd("kvm-rma", &kvm_rma_fops, ri, O_RDWR);
	if (fd < 0)
		kvm_release_rma(ri);

	ret->rma_size = ri->npages << PAGE_SHIFT;
	return fd;
}

static struct page *hva_to_page(unsigned long addr)
{
	struct page *page[1];
	int npages;

	might_sleep();

	npages = get_user_pages_fast(addr, 1, 1, page);

	if (unlikely(npages != 1))
		return 0;

	return page[0];
}

int kvmppc_core_prepare_memory_region(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem)
{
	unsigned long psize, porder;
	unsigned long i, npages, totalpages;
	unsigned long pg_ix;
	struct kvmppc_pginfo *pginfo;
	unsigned long hva;
	struct kvmppc_rma_info *ri = NULL;
	struct page *page;

	/* For now, only allow 16MB pages */
	porder = LARGE_PAGE_ORDER;
	psize = 1ul << porder;
	if ((mem->memory_size & (psize - 1)) ||
	    (mem->guest_phys_addr & (psize - 1))) {
		pr_err("bad memory_size=%llx @ %llx\n",
		       mem->memory_size, mem->guest_phys_addr);
		return -EINVAL;
	}

	npages = mem->memory_size >> porder;
	totalpages = (mem->guest_phys_addr + mem->memory_size) >> porder;

	/* More memory than we have space to track? */
	if (totalpages > (1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER)))
		return -EINVAL;

	/* Do we already have an RMA registered? */
	if (mem->guest_phys_addr == 0 && kvm->arch.rma)
		return -EINVAL;

	if (totalpages > kvm->arch.ram_npages)
		kvm->arch.ram_npages = totalpages;

	/* Is this one of our preallocated RMAs? */
	if (mem->guest_phys_addr == 0) {
		struct vm_area_struct *vma;

		down_read(&current->mm->mmap_sem);
		vma = find_vma(current->mm, mem->userspace_addr);
		if (vma && vma->vm_file &&
		    vma->vm_file->f_op == &kvm_rma_fops &&
		    mem->userspace_addr == vma->vm_start)
			ri = vma->vm_file->private_data;
		up_read(&current->mm->mmap_sem);
		if (!ri && cpu_has_feature(CPU_FTR_ARCH_201)) {
			pr_err("CPU requires an RMO\n");
			return -EINVAL;
		}
	}

	if (ri) {
		unsigned long rma_size;
		unsigned long lpcr;
		long rmls;

		rma_size = ri->npages << PAGE_SHIFT;
		if (rma_size > mem->memory_size)
			rma_size = mem->memory_size;
		rmls = lpcr_rmls(rma_size);
		if (rmls < 0) {
			pr_err("Can't use RMA of 0x%lx bytes\n", rma_size);
			return -EINVAL;
		}
		atomic_inc(&ri->use_count);
		kvm->arch.rma = ri;
		kvm->arch.n_rma_pages = rma_size >> porder;

		/* Update LPCR and RMOR */
		lpcr = kvm->arch.lpcr;
		if (cpu_has_feature(CPU_FTR_ARCH_201)) {
			/* PPC970; insert RMLS value (split field) in HID4 */
			lpcr &= ~((1ul << HID4_RMLS0_SH) |
				  (3ul << HID4_RMLS2_SH));
			lpcr |= ((rmls >> 2) << HID4_RMLS0_SH) |
				((rmls & 3) << HID4_RMLS2_SH);
			/* RMOR is also in HID4 */
			lpcr |= ((ri->base_pfn >> (26 - PAGE_SHIFT)) & 0xffff)
				<< HID4_RMOR_SH;
		} else {
			/* POWER7 */
			lpcr &= ~(LPCR_VPM0 | LPCR_VRMA_L);
			lpcr |= rmls << LPCR_RMLS_SH;
			kvm->arch.rmor = kvm->arch.rma->base_pfn << PAGE_SHIFT;
		}
		kvm->arch.lpcr = lpcr;
		pr_info("Using RMO at %lx size %lx (LPCR = %lx)\n",
			ri->base_pfn << PAGE_SHIFT, rma_size, lpcr);
	}

	pg_ix = mem->guest_phys_addr >> porder;
	pginfo = kvm->arch.ram_pginfo + pg_ix;
	for (i = 0; i < npages; ++i, ++pg_ix) {
		if (ri && pg_ix < kvm->arch.n_rma_pages) {
			pginfo[i].pfn = ri->base_pfn +
				(pg_ix << (porder - PAGE_SHIFT));
			continue;
		}
		hva = mem->userspace_addr + (i << porder);
		page = hva_to_page(hva);
		if (!page) {
			pr_err("oops, no pfn for hva %lx\n", hva);
			goto err;
		}
		/* Check it's a 16MB page */
		if (!PageHead(page) ||
		    compound_order(page) != (LARGE_PAGE_ORDER - PAGE_SHIFT)) {
			pr_err("page at %lx isn't 16MB (o=%d)\n",
			       hva, compound_order(page));
			goto err;
		}
		pginfo[i].pfn = page_to_pfn(page);
	}

	return 0;

 err:
	return -EINVAL;
}

void kvmppc_core_commit_memory_region(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem)
{
	if (mem->guest_phys_addr == 0 && mem->memory_size != 0 &&
	    !kvm->arch.rma)
		kvmppc_map_vrma(kvm, mem);
}

int kvmppc_core_init_vm(struct kvm *kvm)
{
	long r;
	unsigned long npages = 1ul << (MAX_MEM_ORDER - LARGE_PAGE_ORDER);
	long err = -ENOMEM;
	unsigned long lpcr;

	/* Allocate hashed page table */
	r = kvmppc_alloc_hpt(kvm);
	if (r)
		return r;

	INIT_LIST_HEAD(&kvm->arch.spapr_tce_tables);

	kvm->arch.ram_pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo),
				       GFP_KERNEL);
	if (!kvm->arch.ram_pginfo) {
		pr_err("kvmppc_core_init_vm: couldn't alloc %lu bytes\n",
		       npages * sizeof(struct kvmppc_pginfo));
		goto out_free;
	}

	kvm->arch.ram_npages = 0;
	kvm->arch.ram_psize = 1ul << LARGE_PAGE_ORDER;
	kvm->arch.ram_porder = LARGE_PAGE_ORDER;
	kvm->arch.rma = NULL;
	kvm->arch.n_rma_pages = 0;

	kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);

	if (cpu_has_feature(CPU_FTR_ARCH_201)) {
		/* PPC970; HID4 is effectively the LPCR */
		unsigned long lpid = kvm->arch.lpid;
		kvm->arch.host_lpid = 0;
		kvm->arch.host_lpcr = lpcr = mfspr(SPRN_HID4);
		lpcr &= ~((3 << HID4_LPID1_SH) | (0xful << HID4_LPID5_SH));
		lpcr |= ((lpid >> 4) << HID4_LPID1_SH) |
			((lpid & 0xf) << HID4_LPID5_SH);
	} else {
		/* POWER7; init LPCR for virtual RMA mode */
		kvm->arch.host_lpid = mfspr(SPRN_LPID);
		kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
		lpcr &= LPCR_PECE | LPCR_LPES;
		lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
			LPCR_VPM0 | LPCR_VRMA_L;
	}
	kvm->arch.lpcr = lpcr;

	return 0;

 out_free:
	kvmppc_free_hpt(kvm);
	return err;
}

void kvmppc_core_destroy_vm(struct kvm *kvm)
{
	struct kvmppc_pginfo *pginfo;
	unsigned long i;

	if (kvm->arch.ram_pginfo) {
		pginfo = kvm->arch.ram_pginfo;
		kvm->arch.ram_pginfo = NULL;
		for (i = kvm->arch.n_rma_pages; i < kvm->arch.ram_npages; ++i)
			if (pginfo[i].pfn)
				put_page(pfn_to_page(pginfo[i].pfn));
		kfree(pginfo);
	}
	if (kvm->arch.rma) {
		kvm_release_rma(kvm->arch.rma);
		kvm->arch.rma = NULL;
	}

	kvmppc_free_hpt(kvm);
	WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
}

/* These are stubs for now */
void kvmppc_mmu_pte_pflush(struct kvm_vcpu *vcpu, ulong pa_start, ulong pa_end)
{
}

/* We don't need to emulate any privileged instructions or dcbz */
int kvmppc_core_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
                           unsigned int inst, int *advance)
{
	return EMULATE_FAIL;
}

int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
{
	return EMULATE_FAIL;
}

int kvmppc_core_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
{
	return EMULATE_FAIL;
}

static int kvmppc_book3s_hv_init(void)
{
	int r;

	r = kvm_init(NULL, sizeof(struct kvm_vcpu), 0, THIS_MODULE);

	if (r)
		return r;

	r = kvmppc_mmu_hv_init();

	return r;
}

static void kvmppc_book3s_hv_exit(void)
{
	kvm_exit();
}

module_init(kvmppc_book3s_hv_init);
module_exit(kvmppc_book3s_hv_exit);