aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/booke_guest.c
blob: b3db6f4576ad36698c36d605e2b2d3fcbbcda887 (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
/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2007
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>

#include "44x_tlb.h"

#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU

struct kvm_stats_debugfs_item debugfs_entries[] = {
	{ "exits",      VCPU_STAT(sum_exits) },
	{ "mmio",       VCPU_STAT(mmio_exits) },
	{ "dcr",        VCPU_STAT(dcr_exits) },
	{ "sig",        VCPU_STAT(signal_exits) },
	{ "light",      VCPU_STAT(light_exits) },
	{ "itlb_r",     VCPU_STAT(itlb_real_miss_exits) },
	{ "itlb_v",     VCPU_STAT(itlb_virt_miss_exits) },
	{ "dtlb_r",     VCPU_STAT(dtlb_real_miss_exits) },
	{ "dtlb_v",     VCPU_STAT(dtlb_virt_miss_exits) },
	{ "sysc",       VCPU_STAT(syscall_exits) },
	{ "isi",        VCPU_STAT(isi_exits) },
	{ "dsi",        VCPU_STAT(dsi_exits) },
	{ "inst_emu",   VCPU_STAT(emulated_inst_exits) },
	{ "dec",        VCPU_STAT(dec_exits) },
	{ "ext_intr",   VCPU_STAT(ext_intr_exits) },
	{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
	{ NULL }
};

static const u32 interrupt_msr_mask[16] = {
	[BOOKE_INTERRUPT_CRITICAL]      = MSR_ME,
	[BOOKE_INTERRUPT_MACHINE_CHECK] = 0,
	[BOOKE_INTERRUPT_DATA_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_INST_STORAGE]  = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_EXTERNAL]      = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_ALIGNMENT]     = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_PROGRAM]       = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_FP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_SYSCALL]       = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_AP_UNAVAIL]    = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_DECREMENTER]   = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_FIT]           = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_WATCHDOG]      = MSR_ME,
	[BOOKE_INTERRUPT_DTLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_ITLB_MISS]     = MSR_CE|MSR_ME|MSR_DE,
	[BOOKE_INTERRUPT_DEBUG]         = MSR_ME,
};

const unsigned char exception_priority[] = {
	[BOOKE_INTERRUPT_DATA_STORAGE] = 0,
	[BOOKE_INTERRUPT_INST_STORAGE] = 1,
	[BOOKE_INTERRUPT_ALIGNMENT] = 2,
	[BOOKE_INTERRUPT_PROGRAM] = 3,
	[BOOKE_INTERRUPT_FP_UNAVAIL] = 4,
	[BOOKE_INTERRUPT_SYSCALL] = 5,
	[BOOKE_INTERRUPT_AP_UNAVAIL] = 6,
	[BOOKE_INTERRUPT_DTLB_MISS] = 7,
	[BOOKE_INTERRUPT_ITLB_MISS] = 8,
	[BOOKE_INTERRUPT_MACHINE_CHECK] = 9,
	[BOOKE_INTERRUPT_DEBUG] = 10,
	[BOOKE_INTERRUPT_CRITICAL] = 11,
	[BOOKE_INTERRUPT_WATCHDOG] = 12,
	[BOOKE_INTERRUPT_EXTERNAL] = 13,
	[BOOKE_INTERRUPT_FIT] = 14,
	[BOOKE_INTERRUPT_DECREMENTER] = 15,
};

const unsigned char priority_exception[] = {
	BOOKE_INTERRUPT_DATA_STORAGE,
	BOOKE_INTERRUPT_INST_STORAGE,
	BOOKE_INTERRUPT_ALIGNMENT,
	BOOKE_INTERRUPT_PROGRAM,
	BOOKE_INTERRUPT_FP_UNAVAIL,
	BOOKE_INTERRUPT_SYSCALL,
	BOOKE_INTERRUPT_AP_UNAVAIL,
	BOOKE_INTERRUPT_DTLB_MISS,
	BOOKE_INTERRUPT_ITLB_MISS,
	BOOKE_INTERRUPT_MACHINE_CHECK,
	BOOKE_INTERRUPT_DEBUG,
	BOOKE_INTERRUPT_CRITICAL,
	BOOKE_INTERRUPT_WATCHDOG,
	BOOKE_INTERRUPT_EXTERNAL,
	BOOKE_INTERRUPT_FIT,
	BOOKE_INTERRUPT_DECREMENTER,
};


void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
{
	struct tlbe *tlbe;
	int i;

	printk("vcpu %d TLB dump:\n", vcpu->vcpu_id);
	printk("| %2s | %3s | %8s | %8s | %8s |\n",
			"nr", "tid", "word0", "word1", "word2");

	for (i = 0; i < PPC44x_TLB_SIZE; i++) {
		tlbe = &vcpu->arch.guest_tlb[i];
		if (tlbe->word0 & PPC44x_TLB_VALID)
			printk(" G%2d |  %02X | %08X | %08X | %08X |\n",
			       i, tlbe->tid, tlbe->word0, tlbe->word1,
			       tlbe->word2);
	}

	for (i = 0; i < PPC44x_TLB_SIZE; i++) {
		tlbe = &vcpu->arch.shadow_tlb[i];
		if (tlbe->word0 & PPC44x_TLB_VALID)
			printk(" S%2d | %02X | %08X | %08X | %08X |\n",
			       i, tlbe->tid, tlbe->word0, tlbe->word1,
			       tlbe->word2);
	}
}

/* TODO: use vcpu_printf() */
void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
{
	int i;

	printk("pc:   %08x msr:  %08x\n", vcpu->arch.pc, vcpu->arch.msr);
	printk("lr:   %08x ctr:  %08x\n", vcpu->arch.lr, vcpu->arch.ctr);
	printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1);

	printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);

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

/* Check if we are ready to deliver the interrupt */
static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
{
	int r;

	switch (interrupt) {
	case BOOKE_INTERRUPT_CRITICAL:
		r = vcpu->arch.msr & MSR_CE;
		break;
	case BOOKE_INTERRUPT_MACHINE_CHECK:
		r = vcpu->arch.msr & MSR_ME;
		break;
	case BOOKE_INTERRUPT_EXTERNAL:
		r = vcpu->arch.msr & MSR_EE;
		break;
	case BOOKE_INTERRUPT_DECREMENTER:
		r = vcpu->arch.msr & MSR_EE;
		break;
	case BOOKE_INTERRUPT_FIT:
		r = vcpu->arch.msr & MSR_EE;
		break;
	case BOOKE_INTERRUPT_WATCHDOG:
		r = vcpu->arch.msr & MSR_CE;
		break;
	case BOOKE_INTERRUPT_DEBUG:
		r = vcpu->arch.msr & MSR_DE;
		break;
	default:
		r = 1;
	}

	return r;
}

static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
{
	switch (interrupt) {
	case BOOKE_INTERRUPT_DECREMENTER:
		vcpu->arch.tsr |= TSR_DIS;
		break;
	}

	vcpu->arch.srr0 = vcpu->arch.pc;
	vcpu->arch.srr1 = vcpu->arch.msr;
	vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt];
	kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]);
}

/* Check pending exceptions and deliver one, if possible. */
void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
{
	unsigned long *pending = &vcpu->arch.pending_exceptions;
	unsigned int exception;
	unsigned int priority;

	priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
	while (priority <= BOOKE_MAX_INTERRUPT) {
		exception = priority_exception[priority];
		if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
			kvmppc_clear_exception(vcpu, exception);
			kvmppc_deliver_interrupt(vcpu, exception);
			break;
		}

		priority = find_next_bit(pending,
		                         BITS_PER_BYTE * sizeof(*pending),
		                         priority + 1);
	}
}

static int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
	enum emulation_result er;
	int r;

	er = kvmppc_emulate_instruction(run, vcpu);
	switch (er) {
	case EMULATE_DONE:
		/* Future optimization: only reload non-volatiles if they were
		 * actually modified. */
		r = RESUME_GUEST_NV;
		break;
	case EMULATE_DO_MMIO:
		run->exit_reason = KVM_EXIT_MMIO;
		/* We must reload nonvolatiles because "update" load/store
		 * instructions modify register state. */
		/* Future optimization: only reload non-volatiles if they were
		 * actually modified. */
		r = RESUME_HOST_NV;
		break;
	case EMULATE_FAIL:
		/* XXX Deliver Program interrupt to guest. */
		printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
		       vcpu->arch.last_inst);
		r = RESUME_HOST;
		break;
	default:
		BUG();
	}

	return r;
}

/**
 * kvmppc_handle_exit
 *
 * Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
 */
int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
                       unsigned int exit_nr)
{
	enum emulation_result er;
	int r = RESUME_HOST;

	local_irq_enable();

	run->exit_reason = KVM_EXIT_UNKNOWN;
	run->ready_for_interrupt_injection = 1;

	switch (exit_nr) {
	case BOOKE_INTERRUPT_MACHINE_CHECK:
		printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
		kvmppc_dump_vcpu(vcpu);
		r = RESUME_HOST;
		break;

	case BOOKE_INTERRUPT_EXTERNAL:
	case BOOKE_INTERRUPT_DECREMENTER:
		/* Since we switched IVPR back to the host's value, the host
		 * handled this interrupt the moment we enabled interrupts.
		 * Now we just offer it a chance to reschedule the guest. */

		/* XXX At this point the TLB still holds our shadow TLB, so if
		 * we do reschedule the host will fault over it. Perhaps we
		 * should politely restore the host's entries to minimize
		 * misses before ceding control. */
		if (need_resched())
			cond_resched();
		if (exit_nr == BOOKE_INTERRUPT_DECREMENTER)
			vcpu->stat.dec_exits++;
		else
			vcpu->stat.ext_intr_exits++;
		r = RESUME_GUEST;
		break;

	case BOOKE_INTERRUPT_PROGRAM:
		if (vcpu->arch.msr & MSR_PR) {
			/* Program traps generated by user-level software must be handled
			 * by the guest kernel. */
			vcpu->arch.esr = vcpu->arch.fault_esr;
			kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
			r = RESUME_GUEST;
			break;
		}

		er = kvmppc_emulate_instruction(run, vcpu);
		switch (er) {
		case EMULATE_DONE:
			/* Future optimization: only reload non-volatiles if
			 * they were actually modified by emulation. */
			vcpu->stat.emulated_inst_exits++;
			r = RESUME_GUEST_NV;
			break;
		case EMULATE_DO_DCR:
			run->exit_reason = KVM_EXIT_DCR;
			r = RESUME_HOST;
			break;
		case EMULATE_FAIL:
			/* XXX Deliver Program interrupt to guest. */
			printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n",
			       __func__, vcpu->arch.pc, vcpu->arch.last_inst);
			/* For debugging, encode the failing instruction and
			 * report it to userspace. */
			run->hw.hardware_exit_reason = ~0ULL << 32;
			run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
			r = RESUME_HOST;
			break;
		default:
			BUG();
		}
		break;

	case BOOKE_INTERRUPT_DATA_STORAGE:
		vcpu->arch.dear = vcpu->arch.fault_dear;
		vcpu->arch.esr = vcpu->arch.fault_esr;
		kvmppc_queue_exception(vcpu, exit_nr);
		vcpu->stat.dsi_exits++;
		r = RESUME_GUEST;
		break;

	case BOOKE_INTERRUPT_INST_STORAGE:
		vcpu->arch.esr = vcpu->arch.fault_esr;
		kvmppc_queue_exception(vcpu, exit_nr);
		vcpu->stat.isi_exits++;
		r = RESUME_GUEST;
		break;

	case BOOKE_INTERRUPT_SYSCALL:
		kvmppc_queue_exception(vcpu, exit_nr);
		vcpu->stat.syscall_exits++;
		r = RESUME_GUEST;
		break;

	case BOOKE_INTERRUPT_DTLB_MISS: {
		struct tlbe *gtlbe;
		unsigned long eaddr = vcpu->arch.fault_dear;
		gfn_t gfn;

		/* Check the guest TLB. */
		gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
		if (!gtlbe) {
			/* The guest didn't have a mapping for it. */
			kvmppc_queue_exception(vcpu, exit_nr);
			vcpu->arch.dear = vcpu->arch.fault_dear;
			vcpu->arch.esr = vcpu->arch.fault_esr;
			vcpu->stat.dtlb_real_miss_exits++;
			r = RESUME_GUEST;
			break;
		}

		vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
		gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;

		if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
			/* The guest TLB had a mapping, but the shadow TLB
			 * didn't, and it is RAM. This could be because:
			 * a) the entry is mapping the host kernel, or
			 * b) the guest used a large mapping which we're faking
			 * Either way, we need to satisfy the fault without
			 * invoking the guest. */
			kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
			               gtlbe->word2);
			vcpu->stat.dtlb_virt_miss_exits++;
			r = RESUME_GUEST;
		} else {
			/* Guest has mapped and accessed a page which is not
			 * actually RAM. */
			r = kvmppc_emulate_mmio(run, vcpu);
		}

		break;
	}

	case BOOKE_INTERRUPT_ITLB_MISS: {
		struct tlbe *gtlbe;
		unsigned long eaddr = vcpu->arch.pc;
		gfn_t gfn;

		r = RESUME_GUEST;

		/* Check the guest TLB. */
		gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
		if (!gtlbe) {
			/* The guest didn't have a mapping for it. */
			kvmppc_queue_exception(vcpu, exit_nr);
			vcpu->stat.itlb_real_miss_exits++;
			break;
		}

		vcpu->stat.itlb_virt_miss_exits++;

		gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT;

		if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
			/* The guest TLB had a mapping, but the shadow TLB
			 * didn't. This could be because:
			 * a) the entry is mapping the host kernel, or
			 * b) the guest used a large mapping which we're faking
			 * Either way, we need to satisfy the fault without
			 * invoking the guest. */
			kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
			               gtlbe->word2);
		} else {
			/* Guest mapped and leaped at non-RAM! */
			kvmppc_queue_exception(vcpu,
			                       BOOKE_INTERRUPT_MACHINE_CHECK);
		}

		break;
	}

	default:
		printk(KERN_EMERG "exit_nr %d\n", exit_nr);
		BUG();
	}

	local_irq_disable();

	kvmppc_check_and_deliver_interrupts(vcpu);

	/* Do some exit accounting. */
	vcpu->stat.sum_exits++;
	if (!(r & RESUME_HOST)) {
		/* To avoid clobbering exit_reason, only check for signals if
		 * we aren't already exiting to userspace for some other
		 * reason. */
		if (signal_pending(current)) {
			run->exit_reason = KVM_EXIT_INTR;
			r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);

			vcpu->stat.signal_exits++;
		} else {
			vcpu->stat.light_exits++;
		}
	} else {
		switch (run->exit_reason) {
		case KVM_EXIT_MMIO:
			vcpu->stat.mmio_exits++;
			break;
		case KVM_EXIT_DCR:
			vcpu->stat.dcr_exits++;
			break;
		case KVM_EXIT_INTR:
			vcpu->stat.signal_exits++;
			break;
		}
	}

	return r;
}

/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
	struct tlbe *tlbe = &vcpu->arch.guest_tlb[0];

	tlbe->tid = 0;
	tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
	tlbe->word1 = 0;
	tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;

	tlbe++;
	tlbe->tid = 0;
	tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
	tlbe->word1 = 0xef600000;
	tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
	              | PPC44x_TLB_I | PPC44x_TLB_G;

	vcpu->arch.pc = 0;
	vcpu->arch.msr = 0;
	vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */

	/* Eye-catching number so we know if the guest takes an interrupt
	 * before it's programmed its own IVPR. */
	vcpu->arch.ivpr = 0x55550000;

	/* Since the guest can directly access the timebase, it must know the
	 * real timebase frequency. Accordingly, it must see the state of
	 * CCR1[TCS]. */
	vcpu->arch.ccr1 = mfspr(SPRN_CCR1);

	return 0;
}

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

	regs->pc = vcpu->arch.pc;
	regs->cr = vcpu->arch.cr;
	regs->ctr = vcpu->arch.ctr;
	regs->lr = vcpu->arch.lr;
	regs->xer = vcpu->arch.xer;
	regs->msr = vcpu->arch.msr;
	regs->srr0 = vcpu->arch.srr0;
	regs->srr1 = vcpu->arch.srr1;
	regs->pid = vcpu->arch.pid;
	regs->sprg0 = vcpu->arch.sprg0;
	regs->sprg1 = vcpu->arch.sprg1;
	regs->sprg2 = vcpu->arch.sprg2;
	regs->sprg3 = vcpu->arch.sprg3;
	regs->sprg5 = vcpu->arch.sprg4;
	regs->sprg6 = vcpu->arch.sprg5;
	regs->sprg7 = vcpu->arch.sprg6;

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

	return 0;
}

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

	vcpu->arch.pc = regs->pc;
	vcpu->arch.cr = regs->cr;
	vcpu->arch.ctr = regs->ctr;
	vcpu->arch.lr = regs->lr;
	vcpu->arch.xer = regs->xer;
	vcpu->arch.msr = regs->msr;
	vcpu->arch.srr0 = regs->srr0;
	vcpu->arch.srr1 = regs->srr1;
	vcpu->arch.sprg0 = regs->sprg0;
	vcpu->arch.sprg1 = regs->sprg1;
	vcpu->arch.sprg2 = regs->sprg2;
	vcpu->arch.sprg3 = regs->sprg3;
	vcpu->arch.sprg5 = regs->sprg4;
	vcpu->arch.sprg6 = regs->sprg5;
	vcpu->arch.sprg7 = regs->sprg6;

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

	return 0;
}

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

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

int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	return -ENOTSUPP;
}

int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	return -ENOTSUPP;
}

/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
                                  struct kvm_translation *tr)
{
	struct tlbe *gtlbe;
	int index;
	gva_t eaddr;
	u8 pid;
	u8 as;

	eaddr = tr->linear_address;
	pid = (tr->linear_address >> 32) & 0xff;
	as = (tr->linear_address >> 40) & 0x1;

	index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
	if (index == -1) {
		tr->valid = 0;
		return 0;
	}

	gtlbe = &vcpu->arch.guest_tlb[index];

	tr->physical_address = tlb_xlate(gtlbe, eaddr);
	/* XXX what does "writeable" and "usermode" even mean? */
	tr->valid = 1;

	return 0;
}