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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / arch / powerpc / kernel / kvm.c
blob617eba82531cb9916c5d34c7a5f087849a724601
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
4 * Copyright 2010-2011 Freescale Semiconductor, Inc.
5 *
6 * Authors:
7 * Alexander Graf <agraf@suse.de>
8 */
9
10 #include <linux/kvm_host.h>
11 #include <linux/init.h>
12 #include <linux/export.h>
13 #include <linux/kmemleak.h>
14 #include <linux/kvm_para.h>
15 #include <linux/slab.h>
16 #include <linux/of.h>
17 #include <linux/pagemap.h>
18
19 #include <asm/reg.h>
20 #include <asm/sections.h>
21 #include <asm/cacheflush.h>
22 #include <asm/disassemble.h>
23 #include <asm/ppc-opcode.h>
24 #include <asm/epapr_hcalls.h>
25
26 #define KVM_MAGIC_PAGE (-4096L)
27 #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
28
29 #define KVM_INST_LWZ 0x80000000
30 #define KVM_INST_STW 0x90000000
31 #define KVM_INST_LD 0xe8000000
32 #define KVM_INST_STD 0xf8000000
33 #define KVM_INST_NOP 0x60000000
34 #define KVM_INST_B 0x48000000
35 #define KVM_INST_B_MASK 0x03ffffff
36 #define KVM_INST_B_MAX 0x01ffffff
37 #define KVM_INST_LI 0x38000000
38
39 #define KVM_MASK_RT 0x03e00000
40 #define KVM_RT_30 0x03c00000
41 #define KVM_MASK_RB 0x0000f800
42 #define KVM_INST_MFMSR 0x7c0000a6
43
44 #define SPR_FROM 0
45 #define SPR_TO 0x100
46
47 #define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \
48 (((sprn) & 0x1f) << 16) | \
49 (((sprn) & 0x3e0) << 6) | \
50 (moveto))
51
52 #define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM)
53 #define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO)
54
55 #define KVM_INST_TLBSYNC 0x7c00046c
56 #define KVM_INST_MTMSRD_L0 0x7c000164
57 #define KVM_INST_MTMSRD_L1 0x7c010164
58 #define KVM_INST_MTMSR 0x7c000124
59
60 #define KVM_INST_WRTEE 0x7c000106
61 #define KVM_INST_WRTEEI_0 0x7c000146
62 #define KVM_INST_WRTEEI_1 0x7c008146
63
64 #define KVM_INST_MTSRIN 0x7c0001e4
65
66 static bool kvm_patching_worked = true;
67 extern char kvm_tmp[];
68 extern char kvm_tmp_end[];
69 static int kvm_tmp_index;
70
71 static void __init kvm_patch_ins(u32 *inst, u32 new_inst)
72 {
73 *inst = new_inst;
74 flush_icache_range((ulong)inst, (ulong)inst + 4);
75 }
76
77 static void __init kvm_patch_ins_ll(u32 *inst, long addr, u32 rt)
78 {
79 #ifdef CONFIG_64BIT
80 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
81 #else
82 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc));
83 #endif
84 }
85
86 static void __init kvm_patch_ins_ld(u32 *inst, long addr, u32 rt)
87 {
88 #ifdef CONFIG_64BIT
89 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
90 #else
91 kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc));
92 #endif
93 }
94
95 static void __init kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt)
96 {
97 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff));
98 }
99
100 static void __init kvm_patch_ins_std(u32 *inst, long addr, u32 rt)
101 {
102 #ifdef CONFIG_64BIT
103 kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc));
104 #else
105 kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc));
106 #endif
107 }
108
109 static void __init kvm_patch_ins_stw(u32 *inst, long addr, u32 rt)
110 {
111 kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc));
112 }
113
114 static void __init kvm_patch_ins_nop(u32 *inst)
115 {
116 kvm_patch_ins(inst, KVM_INST_NOP);
117 }
118
119 static void __init kvm_patch_ins_b(u32 *inst, int addr)
120 {
121 #if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S)
122 /* On relocatable kernels interrupts handlers and our code
123 can be in different regions, so we don't patch them */
124
125 if ((ulong)inst < (ulong)&__end_interrupts)
126 return;
127 #endif
128
129 kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
130 }
131
132 static u32 * __init kvm_alloc(int len)
133 {
134 u32 *p;
135
136 if ((kvm_tmp_index + len) > (kvm_tmp_end - kvm_tmp)) {
137 printk(KERN_ERR "KVM: No more space (%d + %d)\n",
138 kvm_tmp_index, len);
139 kvm_patching_worked = false;
140 return NULL;
141 }
142
143 p = (void*)&kvm_tmp[kvm_tmp_index];
144 kvm_tmp_index += len;
145
146 return p;
147 }
148
149 extern u32 kvm_emulate_mtmsrd_branch_offs;
150 extern u32 kvm_emulate_mtmsrd_reg_offs;
151 extern u32 kvm_emulate_mtmsrd_orig_ins_offs;
152 extern u32 kvm_emulate_mtmsrd_len;
153 extern u32 kvm_emulate_mtmsrd[];
154
155 static void __init kvm_patch_ins_mtmsrd(u32 *inst, u32 rt)
156 {
157 u32 *p;
158 int distance_start;
159 int distance_end;
160 ulong next_inst;
161
162 p = kvm_alloc(kvm_emulate_mtmsrd_len * 4);
163 if (!p)
164 return;
165
166 /* Find out where we are and put everything there */
167 distance_start = (ulong)p - (ulong)inst;
168 next_inst = ((ulong)inst + 4);
169 distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs];
170
171 /* Make sure we only write valid b instructions */
172 if (distance_start > KVM_INST_B_MAX) {
173 kvm_patching_worked = false;
174 return;
175 }
176
177 /* Modify the chunk to fit the invocation */
178 memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4);
179 p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK;
180 switch (get_rt(rt)) {
181 case 30:
182 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
183 magic_var(scratch2), KVM_RT_30);
184 break;
185 case 31:
186 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
187 magic_var(scratch1), KVM_RT_30);
188 break;
189 default:
190 p[kvm_emulate_mtmsrd_reg_offs] |= rt;
191 break;
192 }
193
194 p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst;
195 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4);
196
197 /* Patch the invocation */
198 kvm_patch_ins_b(inst, distance_start);
199 }
200
201 extern u32 kvm_emulate_mtmsr_branch_offs;
202 extern u32 kvm_emulate_mtmsr_reg1_offs;
203 extern u32 kvm_emulate_mtmsr_reg2_offs;
204 extern u32 kvm_emulate_mtmsr_orig_ins_offs;
205 extern u32 kvm_emulate_mtmsr_len;
206 extern u32 kvm_emulate_mtmsr[];
207
208 static void __init kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
209 {
210 u32 *p;
211 int distance_start;
212 int distance_end;
213 ulong next_inst;
214
215 p = kvm_alloc(kvm_emulate_mtmsr_len * 4);
216 if (!p)
217 return;
218
219 /* Find out where we are and put everything there */
220 distance_start = (ulong)p - (ulong)inst;
221 next_inst = ((ulong)inst + 4);
222 distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsr_branch_offs];
223
224 /* Make sure we only write valid b instructions */
225 if (distance_start > KVM_INST_B_MAX) {
226 kvm_patching_worked = false;
227 return;
228 }
229
230 /* Modify the chunk to fit the invocation */
231 memcpy(p, kvm_emulate_mtmsr, kvm_emulate_mtmsr_len * 4);
232 p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK;
233
234 /* Make clobbered registers work too */
235 switch (get_rt(rt)) {
236 case 30:
237 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs],
238 magic_var(scratch2), KVM_RT_30);
239 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs],
240 magic_var(scratch2), KVM_RT_30);
241 break;
242 case 31:
243 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs],
244 magic_var(scratch1), KVM_RT_30);
245 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs],
246 magic_var(scratch1), KVM_RT_30);
247 break;
248 default:
249 p[kvm_emulate_mtmsr_reg1_offs] |= rt;
250 p[kvm_emulate_mtmsr_reg2_offs] |= rt;
251 break;
252 }
253
254 p[kvm_emulate_mtmsr_orig_ins_offs] = *inst;
255 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4);
256
257 /* Patch the invocation */
258 kvm_patch_ins_b(inst, distance_start);
259 }
260
261 #ifdef CONFIG_BOOKE
262
263 extern u32 kvm_emulate_wrtee_branch_offs;
264 extern u32 kvm_emulate_wrtee_reg_offs;
265 extern u32 kvm_emulate_wrtee_orig_ins_offs;
266 extern u32 kvm_emulate_wrtee_len;
267 extern u32 kvm_emulate_wrtee[];
268
269 static void __init kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one)
270 {
271 u32 *p;
272 int distance_start;
273 int distance_end;
274 ulong next_inst;
275
276 p = kvm_alloc(kvm_emulate_wrtee_len * 4);
277 if (!p)
278 return;
279
280 /* Find out where we are and put everything there */
281 distance_start = (ulong)p - (ulong)inst;
282 next_inst = ((ulong)inst + 4);
283 distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs];
284
285 /* Make sure we only write valid b instructions */
286 if (distance_start > KVM_INST_B_MAX) {
287 kvm_patching_worked = false;
288 return;
289 }
290
291 /* Modify the chunk to fit the invocation */
292 memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4);
293 p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK;
294
295 if (imm_one) {
296 p[kvm_emulate_wrtee_reg_offs] =
297 KVM_INST_LI | __PPC_RT(R30) | MSR_EE;
298 } else {
299 /* Make clobbered registers work too */
300 switch (get_rt(rt)) {
301 case 30:
302 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
303 magic_var(scratch2), KVM_RT_30);
304 break;
305 case 31:
306 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
307 magic_var(scratch1), KVM_RT_30);
308 break;
309 default:
310 p[kvm_emulate_wrtee_reg_offs] |= rt;
311 break;
312 }
313 }
314
315 p[kvm_emulate_wrtee_orig_ins_offs] = *inst;
316 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4);
317
318 /* Patch the invocation */
319 kvm_patch_ins_b(inst, distance_start);
320 }
321
322 extern u32 kvm_emulate_wrteei_0_branch_offs;
323 extern u32 kvm_emulate_wrteei_0_len;
324 extern u32 kvm_emulate_wrteei_0[];
325
326 static void __init kvm_patch_ins_wrteei_0(u32 *inst)
327 {
328 u32 *p;
329 int distance_start;
330 int distance_end;
331 ulong next_inst;
332
333 p = kvm_alloc(kvm_emulate_wrteei_0_len * 4);
334 if (!p)
335 return;
336
337 /* Find out where we are and put everything there */
338 distance_start = (ulong)p - (ulong)inst;
339 next_inst = ((ulong)inst + 4);
340 distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs];
341
342 /* Make sure we only write valid b instructions */
343 if (distance_start > KVM_INST_B_MAX) {
344 kvm_patching_worked = false;
345 return;
346 }
347
348 memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4);
349 p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK;
350 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4);
351
352 /* Patch the invocation */
353 kvm_patch_ins_b(inst, distance_start);
354 }
355
356 #endif
357
358 #ifdef CONFIG_PPC_BOOK3S_32
359
360 extern u32 kvm_emulate_mtsrin_branch_offs;
361 extern u32 kvm_emulate_mtsrin_reg1_offs;
362 extern u32 kvm_emulate_mtsrin_reg2_offs;
363 extern u32 kvm_emulate_mtsrin_orig_ins_offs;
364 extern u32 kvm_emulate_mtsrin_len;
365 extern u32 kvm_emulate_mtsrin[];
366
367 static void __init kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb)
368 {
369 u32 *p;
370 int distance_start;
371 int distance_end;
372 ulong next_inst;
373
374 p = kvm_alloc(kvm_emulate_mtsrin_len * 4);
375 if (!p)
376 return;
377
378 /* Find out where we are and put everything there */
379 distance_start = (ulong)p - (ulong)inst;
380 next_inst = ((ulong)inst + 4);
381 distance_end = next_inst - (ulong)&p[kvm_emulate_mtsrin_branch_offs];
382
383 /* Make sure we only write valid b instructions */
384 if (distance_start > KVM_INST_B_MAX) {
385 kvm_patching_worked = false;
386 return;
387 }
388
389 /* Modify the chunk to fit the invocation */
390 memcpy(p, kvm_emulate_mtsrin, kvm_emulate_mtsrin_len * 4);
391 p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK;
392 p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10);
393 p[kvm_emulate_mtsrin_reg2_offs] |= rt;
394 p[kvm_emulate_mtsrin_orig_ins_offs] = *inst;
395 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4);
396
397 /* Patch the invocation */
398 kvm_patch_ins_b(inst, distance_start);
399 }
400
401 #endif
402
403 static void __init kvm_map_magic_page(void *data)
404 {
405 u32 *features = data;
406
407 ulong in[8] = {0};
408 ulong out[8];
409
410 in[0] = KVM_MAGIC_PAGE;
411 in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX;
412
413 epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE));
414
415 *features = out[0];
416 }
417
418 static void __init kvm_check_ins(u32 *inst, u32 features)
419 {
420 u32 _inst = *inst;
421 u32 inst_no_rt = _inst & ~KVM_MASK_RT;
422 u32 inst_rt = _inst & KVM_MASK_RT;
423
424 switch (inst_no_rt) {
425 /* Loads */
426 case KVM_INST_MFMSR:
427 kvm_patch_ins_ld(inst, magic_var(msr), inst_rt);
428 break;
429 case KVM_INST_MFSPR(SPRN_SPRG0):
430 kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt);
431 break;
432 case KVM_INST_MFSPR(SPRN_SPRG1):
433 kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt);
434 break;
435 case KVM_INST_MFSPR(SPRN_SPRG2):
436 kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt);
437 break;
438 case KVM_INST_MFSPR(SPRN_SPRG3):
439 kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt);
440 break;
441 case KVM_INST_MFSPR(SPRN_SRR0):
442 kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt);
443 break;
444 case KVM_INST_MFSPR(SPRN_SRR1):
445 kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt);
446 break;
447 #ifdef CONFIG_BOOKE
448 case KVM_INST_MFSPR(SPRN_DEAR):
449 #else
450 case KVM_INST_MFSPR(SPRN_DAR):
451 #endif
452 kvm_patch_ins_ld(inst, magic_var(dar), inst_rt);
453 break;
454 case KVM_INST_MFSPR(SPRN_DSISR):
455 kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt);
456 break;
457
458 #ifdef CONFIG_PPC_BOOK3E_MMU
459 case KVM_INST_MFSPR(SPRN_MAS0):
460 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
461 kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt);
462 break;
463 case KVM_INST_MFSPR(SPRN_MAS1):
464 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
465 kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt);
466 break;
467 case KVM_INST_MFSPR(SPRN_MAS2):
468 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
469 kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt);
470 break;
471 case KVM_INST_MFSPR(SPRN_MAS3):
472 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
473 kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt);
474 break;
475 case KVM_INST_MFSPR(SPRN_MAS4):
476 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
477 kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt);
478 break;
479 case KVM_INST_MFSPR(SPRN_MAS6):
480 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
481 kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt);
482 break;
483 case KVM_INST_MFSPR(SPRN_MAS7):
484 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
485 kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt);
486 break;
487 #endif /* CONFIG_PPC_BOOK3E_MMU */
488
489 case KVM_INST_MFSPR(SPRN_SPRG4):
490 #ifdef CONFIG_BOOKE
491 case KVM_INST_MFSPR(SPRN_SPRG4R):
492 #endif
493 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
494 kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt);
495 break;
496 case KVM_INST_MFSPR(SPRN_SPRG5):
497 #ifdef CONFIG_BOOKE
498 case KVM_INST_MFSPR(SPRN_SPRG5R):
499 #endif
500 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
501 kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt);
502 break;
503 case KVM_INST_MFSPR(SPRN_SPRG6):
504 #ifdef CONFIG_BOOKE
505 case KVM_INST_MFSPR(SPRN_SPRG6R):
506 #endif
507 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
508 kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt);
509 break;
510 case KVM_INST_MFSPR(SPRN_SPRG7):
511 #ifdef CONFIG_BOOKE
512 case KVM_INST_MFSPR(SPRN_SPRG7R):
513 #endif
514 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
515 kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt);
516 break;
517
518 #ifdef CONFIG_BOOKE
519 case KVM_INST_MFSPR(SPRN_ESR):
520 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
521 kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt);
522 break;
523 #endif
524
525 case KVM_INST_MFSPR(SPRN_PIR):
526 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
527 kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt);
528 break;
529
530
531 /* Stores */
532 case KVM_INST_MTSPR(SPRN_SPRG0):
533 kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt);
534 break;
535 case KVM_INST_MTSPR(SPRN_SPRG1):
536 kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt);
537 break;
538 case KVM_INST_MTSPR(SPRN_SPRG2):
539 kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt);
540 break;
541 case KVM_INST_MTSPR(SPRN_SPRG3):
542 kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt);
543 break;
544 case KVM_INST_MTSPR(SPRN_SRR0):
545 kvm_patch_ins_std(inst, magic_var(srr0), inst_rt);
546 break;
547 case KVM_INST_MTSPR(SPRN_SRR1):
548 kvm_patch_ins_std(inst, magic_var(srr1), inst_rt);
549 break;
550 #ifdef CONFIG_BOOKE
551 case KVM_INST_MTSPR(SPRN_DEAR):
552 #else
553 case KVM_INST_MTSPR(SPRN_DAR):
554 #endif
555 kvm_patch_ins_std(inst, magic_var(dar), inst_rt);
556 break;
557 case KVM_INST_MTSPR(SPRN_DSISR):
558 kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt);
559 break;
560 #ifdef CONFIG_PPC_BOOK3E_MMU
561 case KVM_INST_MTSPR(SPRN_MAS0):
562 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
563 kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt);
564 break;
565 case KVM_INST_MTSPR(SPRN_MAS1):
566 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
567 kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt);
568 break;
569 case KVM_INST_MTSPR(SPRN_MAS2):
570 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
571 kvm_patch_ins_std(inst, magic_var(mas2), inst_rt);
572 break;
573 case KVM_INST_MTSPR(SPRN_MAS3):
574 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
575 kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt);
576 break;
577 case KVM_INST_MTSPR(SPRN_MAS4):
578 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
579 kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt);
580 break;
581 case KVM_INST_MTSPR(SPRN_MAS6):
582 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
583 kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt);
584 break;
585 case KVM_INST_MTSPR(SPRN_MAS7):
586 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
587 kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt);
588 break;
589 #endif /* CONFIG_PPC_BOOK3E_MMU */
590
591 case KVM_INST_MTSPR(SPRN_SPRG4):
592 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
593 kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt);
594 break;
595 case KVM_INST_MTSPR(SPRN_SPRG5):
596 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
597 kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt);
598 break;
599 case KVM_INST_MTSPR(SPRN_SPRG6):
600 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
601 kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt);
602 break;
603 case KVM_INST_MTSPR(SPRN_SPRG7):
604 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
605 kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt);
606 break;
607
608 #ifdef CONFIG_BOOKE
609 case KVM_INST_MTSPR(SPRN_ESR):
610 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
611 kvm_patch_ins_stw(inst, magic_var(esr), inst_rt);
612 break;
613 #endif
614
615 /* Nops */
616 case KVM_INST_TLBSYNC:
617 kvm_patch_ins_nop(inst);
618 break;
619
620 /* Rewrites */
621 case KVM_INST_MTMSRD_L1:
622 kvm_patch_ins_mtmsrd(inst, inst_rt);
623 break;
624 case KVM_INST_MTMSR:
625 case KVM_INST_MTMSRD_L0:
626 kvm_patch_ins_mtmsr(inst, inst_rt);
627 break;
628 #ifdef CONFIG_BOOKE
629 case KVM_INST_WRTEE:
630 kvm_patch_ins_wrtee(inst, inst_rt, 0);
631 break;
632 #endif
633 }
634
635 switch (inst_no_rt & ~KVM_MASK_RB) {
636 #ifdef CONFIG_PPC_BOOK3S_32
637 case KVM_INST_MTSRIN:
638 if (features & KVM_MAGIC_FEAT_SR) {
639 u32 inst_rb = _inst & KVM_MASK_RB;
640 kvm_patch_ins_mtsrin(inst, inst_rt, inst_rb);
641 }
642 break;
643 #endif
644 }
645
646 switch (_inst) {
647 #ifdef CONFIG_BOOKE
648 case KVM_INST_WRTEEI_0:
649 kvm_patch_ins_wrteei_0(inst);
650 break;
651
652 case KVM_INST_WRTEEI_1:
653 kvm_patch_ins_wrtee(inst, 0, 1);
654 break;
655 #endif
656 }
657 }
658
659 extern u32 kvm_template_start[];
660 extern u32 kvm_template_end[];
661
662 static void __init kvm_use_magic_page(void)
663 {
664 u32 *p;
665 u32 *start, *end;
666 u32 features;
667
668 /* Tell the host to map the magic page to -4096 on all CPUs */
669 on_each_cpu(kvm_map_magic_page, &features, 1);
670
671 /* Quick self-test to see if the mapping works */
672 if (!fault_in_pages_readable((const char *)KVM_MAGIC_PAGE, sizeof(u32))) {
673 kvm_patching_worked = false;
674 return;
675 }
676
677 /* Now loop through all code and find instructions */
678 start = (void*)_stext;
679 end = (void*)_etext;
680
681 /*
682 * Being interrupted in the middle of patching would
683 * be bad for SPRG4-7, which KVM can't keep in sync
684 * with emulated accesses because reads don't trap.
685 */
686 local_irq_disable();
687
688 for (p = start; p < end; p++) {
689 /* Avoid patching the template code */
690 if (p >= kvm_template_start && p < kvm_template_end) {
691 p = kvm_template_end - 1;
692 continue;
693 }
694 kvm_check_ins(p, features);
695 }
696
697 local_irq_enable();
698
699 printk(KERN_INFO "KVM: Live patching for a fast VM %s\n",
700 kvm_patching_worked ? "worked" : "failed");
701 }
702
703 static int __init kvm_guest_init(void)
704 {
705 if (!kvm_para_available())
706 return 0;
707
708 if (!epapr_paravirt_enabled)
709 return 0;
710
711 if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))
712 kvm_use_magic_page();
713
714 #ifdef CONFIG_PPC_BOOK3S_64
715 /* Enable napping */
716 powersave_nap = 1;
717 #endif
718
719 return 0;
720 }
721
722 postcore_initcall(kvm_guest_init);
Linux with added FPC-III support