aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kvm/booke_emulate.c
blob: 689ff5f90e9ef9f725395e1434cd69e32e5c0347 (plain) (blame)
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
// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 * Copyright IBM Corp. 2008
 * Copyright 2011 Freescale Semiconductor, Inc.
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 */

#include <linux/kvm_host.h>
#include <asm/disassemble.h>

#include "booke.h"

#define OP_19_XOP_RFI     50
#define OP_19_XOP_RFCI    51
#define OP_19_XOP_RFDI    39

#define OP_31_XOP_MFMSR   83
#define OP_31_XOP_WRTEE   131
#define OP_31_XOP_MTMSR   146
#define OP_31_XOP_WRTEEI  163

static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
{
	vcpu->arch.regs.nip = vcpu->arch.shared->srr0;
	kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
}

static void kvmppc_emul_rfdi(struct kvm_vcpu *vcpu)
{
	vcpu->arch.regs.nip = vcpu->arch.dsrr0;
	kvmppc_set_msr(vcpu, vcpu->arch.dsrr1);
}

static void kvmppc_emul_rfci(struct kvm_vcpu *vcpu)
{
	vcpu->arch.regs.nip = vcpu->arch.csrr0;
	kvmppc_set_msr(vcpu, vcpu->arch.csrr1);
}

int kvmppc_booke_emulate_op(struct kvm_run *run, struct kvm_vcpu *vcpu,
                            unsigned int inst, int *advance)
{
	int emulated = EMULATE_DONE;
	int rs = get_rs(inst);
	int rt = get_rt(inst);

	switch (get_op(inst)) {
	case 19:
		switch (get_xop(inst)) {
		case OP_19_XOP_RFI:
			kvmppc_emul_rfi(vcpu);
			kvmppc_set_exit_type(vcpu, EMULATED_RFI_EXITS);
			*advance = 0;
			break;

		case OP_19_XOP_RFCI:
			kvmppc_emul_rfci(vcpu);
			kvmppc_set_exit_type(vcpu, EMULATED_RFCI_EXITS);
			*advance = 0;
			break;

		case OP_19_XOP_RFDI:
			kvmppc_emul_rfdi(vcpu);
			kvmppc_set_exit_type(vcpu, EMULATED_RFDI_EXITS);
			*advance = 0;
			break;

		default:
			emulated = EMULATE_FAIL;
			break;
		}
		break;

	case 31:
		switch (get_xop(inst)) {

		case OP_31_XOP_MFMSR:
			kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
			kvmppc_set_exit_type(vcpu, EMULATED_MFMSR_EXITS);
			break;

		case OP_31_XOP_MTMSR:
			kvmppc_set_exit_type(vcpu, EMULATED_MTMSR_EXITS);
			kvmppc_set_msr(vcpu, kvmppc_get_gpr(vcpu, rs));
			break;

		case OP_31_XOP_WRTEE:
			vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
					| (kvmppc_get_gpr(vcpu, rs) & MSR_EE);
			kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
			break;

		case OP_31_XOP_WRTEEI:
			vcpu->arch.shared->msr = (vcpu->arch.shared->msr & ~MSR_EE)
							 | (inst & MSR_EE);
			kvmppc_set_exit_type(vcpu, EMULATED_WRTEE_EXITS);
			break;

		default:
			emulated = EMULATE_FAIL;
		}

		break;

	default:
		emulated = EMULATE_FAIL;
	}

	return emulated;
}

/*
 * NOTE: some of these registers are not emulated on BOOKE_HV (GS-mode).
 * Their backing store is in real registers, and these functions
 * will return the wrong result if called for them in another context
 * (such as debugging).
 */
int kvmppc_booke_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
{
	int emulated = EMULATE_DONE;
	bool debug_inst = false;

	switch (sprn) {
	case SPRN_DEAR:
		vcpu->arch.shared->dar = spr_val;
		break;
	case SPRN_ESR:
		vcpu->arch.shared->esr = spr_val;
		break;
	case SPRN_CSRR0:
		vcpu->arch.csrr0 = spr_val;
		break;
	case SPRN_CSRR1:
		vcpu->arch.csrr1 = spr_val;
		break;
	case SPRN_DSRR0:
		vcpu->arch.dsrr0 = spr_val;
		break;
	case SPRN_DSRR1:
		vcpu->arch.dsrr1 = spr_val;
		break;
	case SPRN_IAC1:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.iac1 = spr_val;
		break;
	case SPRN_IAC2:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.iac2 = spr_val;
		break;
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
	case SPRN_IAC3:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.iac3 = spr_val;
		break;
	case SPRN_IAC4:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.iac4 = spr_val;
		break;
#endif
	case SPRN_DAC1:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.dac1 = spr_val;
		break;
	case SPRN_DAC2:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.dac2 = spr_val;
		break;
	case SPRN_DBCR0:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		spr_val &= (DBCR0_IDM | DBCR0_IC | DBCR0_BT | DBCR0_TIE |
			DBCR0_IAC1 | DBCR0_IAC2 | DBCR0_IAC3 | DBCR0_IAC4  |
			DBCR0_DAC1R | DBCR0_DAC1W | DBCR0_DAC2R | DBCR0_DAC2W);

		vcpu->arch.dbg_reg.dbcr0 = spr_val;
		break;
	case SPRN_DBCR1:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.dbcr1 = spr_val;
		break;
	case SPRN_DBCR2:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		debug_inst = true;
		vcpu->arch.dbg_reg.dbcr2 = spr_val;
		break;
	case SPRN_DBSR:
		/*
		 * If userspace is debugging guest then guest
		 * can not access debug registers.
		 */
		if (vcpu->guest_debug)
			break;

		vcpu->arch.dbsr &= ~spr_val;
		if (!(vcpu->arch.dbsr & ~DBSR_IDE))
			kvmppc_core_dequeue_debug(vcpu);
		break;
	case SPRN_TSR:
		kvmppc_clr_tsr_bits(vcpu, spr_val);
		break;
	case SPRN_TCR:
		/*
		 * WRC is a 2-bit field that is supposed to preserve its
		 * value once written to non-zero.
		 */
		if (vcpu->arch.tcr & TCR_WRC_MASK) {
			spr_val &= ~TCR_WRC_MASK;
			spr_val |= vcpu->arch.tcr & TCR_WRC_MASK;
		}
		kvmppc_set_tcr(vcpu, spr_val);
		break;

	case SPRN_DECAR:
		vcpu->arch.decar = spr_val;
		break;
	/*
	 * Note: SPRG4-7 are user-readable.
	 * These values are loaded into the real SPRGs when resuming the
	 * guest (PR-mode only).
	 */
	case SPRN_SPRG4:
		kvmppc_set_sprg4(vcpu, spr_val);
		break;
	case SPRN_SPRG5:
		kvmppc_set_sprg5(vcpu, spr_val);
		break;
	case SPRN_SPRG6:
		kvmppc_set_sprg6(vcpu, spr_val);
		break;
	case SPRN_SPRG7:
		kvmppc_set_sprg7(vcpu, spr_val);
		break;

	case SPRN_IVPR:
		vcpu->arch.ivpr = spr_val;
#ifdef CONFIG_KVM_BOOKE_HV
		mtspr(SPRN_GIVPR, spr_val);
#endif
		break;
	case SPRN_IVOR0:
		vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL] = spr_val;
		break;
	case SPRN_IVOR1:
		vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK] = spr_val;
		break;
	case SPRN_IVOR2:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE] = spr_val;
#ifdef CONFIG_KVM_BOOKE_HV
		mtspr(SPRN_GIVOR2, spr_val);
#endif
		break;
	case SPRN_IVOR3:
		vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE] = spr_val;
		break;
	case SPRN_IVOR4:
		vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL] = spr_val;
		break;
	case SPRN_IVOR5:
		vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT] = spr_val;
		break;
	case SPRN_IVOR6:
		vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM] = spr_val;
		break;
	case SPRN_IVOR7:
		vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL] = spr_val;
		break;
	case SPRN_IVOR8:
		vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL] = spr_val;
#ifdef CONFIG_KVM_BOOKE_HV
		mtspr(SPRN_GIVOR8, spr_val);
#endif
		break;
	case SPRN_IVOR9:
		vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL] = spr_val;
		break;
	case SPRN_IVOR10:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER] = spr_val;
		break;
	case SPRN_IVOR11:
		vcpu->arch.ivor[BOOKE_IRQPRIO_FIT] = spr_val;
		break;
	case SPRN_IVOR12:
		vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG] = spr_val;
		break;
	case SPRN_IVOR13:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS] = spr_val;
		break;
	case SPRN_IVOR14:
		vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS] = spr_val;
		break;
	case SPRN_IVOR15:
		vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG] = spr_val;
		break;
	case SPRN_MCSR:
		vcpu->arch.mcsr &= ~spr_val;
		break;
#if defined(CONFIG_64BIT)
	case SPRN_EPCR:
		kvmppc_set_epcr(vcpu, spr_val);
#ifdef CONFIG_KVM_BOOKE_HV
		mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
#endif
		break;
#endif
	default:
		emulated = EMULATE_FAIL;
	}

	if (debug_inst) {
		current->thread.debug = vcpu->arch.dbg_reg;
		switch_booke_debug_regs(&vcpu->arch.dbg_reg);
	}
	return emulated;
}

int kvmppc_booke_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val)
{
	int emulated = EMULATE_DONE;

	switch (sprn) {
	case SPRN_IVPR:
		*spr_val = vcpu->arch.ivpr;
		break;
	case SPRN_DEAR:
		*spr_val = vcpu->arch.shared->dar;
		break;
	case SPRN_ESR:
		*spr_val = vcpu->arch.shared->esr;
		break;
	case SPRN_EPR:
		*spr_val = vcpu->arch.epr;
		break;
	case SPRN_CSRR0:
		*spr_val = vcpu->arch.csrr0;
		break;
	case SPRN_CSRR1:
		*spr_val = vcpu->arch.csrr1;
		break;
	case SPRN_DSRR0:
		*spr_val = vcpu->arch.dsrr0;
		break;
	case SPRN_DSRR1:
		*spr_val = vcpu->arch.dsrr1;
		break;
	case SPRN_IAC1:
		*spr_val = vcpu->arch.dbg_reg.iac1;
		break;
	case SPRN_IAC2:
		*spr_val = vcpu->arch.dbg_reg.iac2;
		break;
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
	case SPRN_IAC3:
		*spr_val = vcpu->arch.dbg_reg.iac3;
		break;
	case SPRN_IAC4:
		*spr_val = vcpu->arch.dbg_reg.iac4;
		break;
#endif
	case SPRN_DAC1:
		*spr_val = vcpu->arch.dbg_reg.dac1;
		break;
	case SPRN_DAC2:
		*spr_val = vcpu->arch.dbg_reg.dac2;
		break;
	case SPRN_DBCR0:
		*spr_val = vcpu->arch.dbg_reg.dbcr0;
		if (vcpu->guest_debug)
			*spr_val = *spr_val | DBCR0_EDM;
		break;
	case SPRN_DBCR1:
		*spr_val = vcpu->arch.dbg_reg.dbcr1;
		break;
	case SPRN_DBCR2:
		*spr_val = vcpu->arch.dbg_reg.dbcr2;
		break;
	case SPRN_DBSR:
		*spr_val = vcpu->arch.dbsr;
		break;
	case SPRN_TSR:
		*spr_val = vcpu->arch.tsr;
		break;
	case SPRN_TCR:
		*spr_val = vcpu->arch.tcr;
		break;

	case SPRN_IVOR0:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_CRITICAL];
		break;
	case SPRN_IVOR1:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_MACHINE_CHECK];
		break;
	case SPRN_IVOR2:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE];
		break;
	case SPRN_IVOR3:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_INST_STORAGE];
		break;
	case SPRN_IVOR4:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_EXTERNAL];
		break;
	case SPRN_IVOR5:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ALIGNMENT];
		break;
	case SPRN_IVOR6:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_PROGRAM];
		break;
	case SPRN_IVOR7:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_FP_UNAVAIL];
		break;
	case SPRN_IVOR8:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL];
		break;
	case SPRN_IVOR9:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_AP_UNAVAIL];
		break;
	case SPRN_IVOR10:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DECREMENTER];
		break;
	case SPRN_IVOR11:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_FIT];
		break;
	case SPRN_IVOR12:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_WATCHDOG];
		break;
	case SPRN_IVOR13:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DTLB_MISS];
		break;
	case SPRN_IVOR14:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_ITLB_MISS];
		break;
	case SPRN_IVOR15:
		*spr_val = vcpu->arch.ivor[BOOKE_IRQPRIO_DEBUG];
		break;
	case SPRN_MCSR:
		*spr_val = vcpu->arch.mcsr;
		break;
#if defined(CONFIG_64BIT)
	case SPRN_EPCR:
		*spr_val = vcpu->arch.epcr;
		break;
#endif

	default:
		emulated = EMULATE_FAIL;
	}

	return emulated;
}