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Merge remote-tracking branch 'asoc/topic/wm8960' into asoc-next
[linux-2.6-block.git] / arch / powerpc / kernel / kvm.c
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1/*
2 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
3 * Copyright 2010-2011 Freescale Semiconductor, Inc.
4 *
5 * Authors:
6 * Alexander Graf <agraf@suse.de>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License, version 2, as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20 */
21
22#include <linux/kvm_host.h>
23#include <linux/init.h>
24#include <linux/export.h>
25#include <linux/kvm_para.h>
26#include <linux/slab.h>
27#include <linux/of.h>
28
29#include <asm/reg.h>
30#include <asm/sections.h>
31#include <asm/cacheflush.h>
32#include <asm/disassemble.h>
33#include <asm/ppc-opcode.h>
34#include <asm/epapr_hcalls.h>
35
36#define KVM_MAGIC_PAGE (-4096L)
37#define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
38
39#define KVM_INST_LWZ 0x80000000
40#define KVM_INST_STW 0x90000000
41#define KVM_INST_LD 0xe8000000
42#define KVM_INST_STD 0xf8000000
43#define KVM_INST_NOP 0x60000000
44#define KVM_INST_B 0x48000000
45#define KVM_INST_B_MASK 0x03ffffff
46#define KVM_INST_B_MAX 0x01ffffff
47#define KVM_INST_LI 0x38000000
48
49#define KVM_MASK_RT 0x03e00000
50#define KVM_RT_30 0x03c00000
51#define KVM_MASK_RB 0x0000f800
52#define KVM_INST_MFMSR 0x7c0000a6
53
54#define SPR_FROM 0
55#define SPR_TO 0x100
56
57#define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \
58 (((sprn) & 0x1f) << 16) | \
59 (((sprn) & 0x3e0) << 6) | \
60 (moveto))
61
62#define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM)
63#define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO)
64
65#define KVM_INST_TLBSYNC 0x7c00046c
66#define KVM_INST_MTMSRD_L0 0x7c000164
67#define KVM_INST_MTMSRD_L1 0x7c010164
68#define KVM_INST_MTMSR 0x7c000124
69
70#define KVM_INST_WRTEE 0x7c000106
71#define KVM_INST_WRTEEI_0 0x7c000146
72#define KVM_INST_WRTEEI_1 0x7c008146
73
74#define KVM_INST_MTSRIN 0x7c0001e4
75
76static bool kvm_patching_worked = true;
77char kvm_tmp[1024 * 1024];
78static int kvm_tmp_index;
79
80static inline void kvm_patch_ins(u32 *inst, u32 new_inst)
81{
82 *inst = new_inst;
83 flush_icache_range((ulong)inst, (ulong)inst + 4);
84}
85
86static void kvm_patch_ins_ll(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 & 0x0000fffc));
92#endif
93}
94
95static void kvm_patch_ins_ld(u32 *inst, long addr, u32 rt)
96{
97#ifdef CONFIG_64BIT
98 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
99#else
100 kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc));
101#endif
102}
103
104static void kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt)
105{
106 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff));
107}
108
109static void kvm_patch_ins_std(u32 *inst, long addr, u32 rt)
110{
111#ifdef CONFIG_64BIT
112 kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc));
113#else
114 kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc));
115#endif
116}
117
118static void kvm_patch_ins_stw(u32 *inst, long addr, u32 rt)
119{
120 kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc));
121}
122
123static void kvm_patch_ins_nop(u32 *inst)
124{
125 kvm_patch_ins(inst, KVM_INST_NOP);
126}
127
128static void kvm_patch_ins_b(u32 *inst, int addr)
129{
130#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S)
131 /* On relocatable kernels interrupts handlers and our code
132 can be in different regions, so we don't patch them */
133
134 if ((ulong)inst < (ulong)&__end_interrupts)
135 return;
136#endif
137
138 kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
139}
140
141static u32 *kvm_alloc(int len)
142{
143 u32 *p;
144
145 if ((kvm_tmp_index + len) > ARRAY_SIZE(kvm_tmp)) {
146 printk(KERN_ERR "KVM: No more space (%d + %d)\n",
147 kvm_tmp_index, len);
148 kvm_patching_worked = false;
149 return NULL;
150 }
151
152 p = (void*)&kvm_tmp[kvm_tmp_index];
153 kvm_tmp_index += len;
154
155 return p;
156}
157
158extern u32 kvm_emulate_mtmsrd_branch_offs;
159extern u32 kvm_emulate_mtmsrd_reg_offs;
160extern u32 kvm_emulate_mtmsrd_orig_ins_offs;
161extern u32 kvm_emulate_mtmsrd_len;
162extern u32 kvm_emulate_mtmsrd[];
163
164static void kvm_patch_ins_mtmsrd(u32 *inst, u32 rt)
165{
166 u32 *p;
167 int distance_start;
168 int distance_end;
169 ulong next_inst;
170
171 p = kvm_alloc(kvm_emulate_mtmsrd_len * 4);
172 if (!p)
173 return;
174
175 /* Find out where we are and put everything there */
176 distance_start = (ulong)p - (ulong)inst;
177 next_inst = ((ulong)inst + 4);
178 distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs];
179
180 /* Make sure we only write valid b instructions */
181 if (distance_start > KVM_INST_B_MAX) {
182 kvm_patching_worked = false;
183 return;
184 }
185
186 /* Modify the chunk to fit the invocation */
187 memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4);
188 p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK;
189 switch (get_rt(rt)) {
190 case 30:
191 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
192 magic_var(scratch2), KVM_RT_30);
193 break;
194 case 31:
195 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
196 magic_var(scratch1), KVM_RT_30);
197 break;
198 default:
199 p[kvm_emulate_mtmsrd_reg_offs] |= rt;
200 break;
201 }
202
203 p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst;
204 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4);
205
206 /* Patch the invocation */
207 kvm_patch_ins_b(inst, distance_start);
208}
209
210extern u32 kvm_emulate_mtmsr_branch_offs;
211extern u32 kvm_emulate_mtmsr_reg1_offs;
212extern u32 kvm_emulate_mtmsr_reg2_offs;
213extern u32 kvm_emulate_mtmsr_orig_ins_offs;
214extern u32 kvm_emulate_mtmsr_len;
215extern u32 kvm_emulate_mtmsr[];
216
217static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
218{
219 u32 *p;
220 int distance_start;
221 int distance_end;
222 ulong next_inst;
223
224 p = kvm_alloc(kvm_emulate_mtmsr_len * 4);
225 if (!p)
226 return;
227
228 /* Find out where we are and put everything there */
229 distance_start = (ulong)p - (ulong)inst;
230 next_inst = ((ulong)inst + 4);
231 distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsr_branch_offs];
232
233 /* Make sure we only write valid b instructions */
234 if (distance_start > KVM_INST_B_MAX) {
235 kvm_patching_worked = false;
236 return;
237 }
238
239 /* Modify the chunk to fit the invocation */
240 memcpy(p, kvm_emulate_mtmsr, kvm_emulate_mtmsr_len * 4);
241 p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK;
242
243 /* Make clobbered registers work too */
244 switch (get_rt(rt)) {
245 case 30:
246 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs],
247 magic_var(scratch2), KVM_RT_30);
248 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs],
249 magic_var(scratch2), KVM_RT_30);
250 break;
251 case 31:
252 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs],
253 magic_var(scratch1), KVM_RT_30);
254 kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs],
255 magic_var(scratch1), KVM_RT_30);
256 break;
257 default:
258 p[kvm_emulate_mtmsr_reg1_offs] |= rt;
259 p[kvm_emulate_mtmsr_reg2_offs] |= rt;
260 break;
261 }
262
263 p[kvm_emulate_mtmsr_orig_ins_offs] = *inst;
264 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4);
265
266 /* Patch the invocation */
267 kvm_patch_ins_b(inst, distance_start);
268}
269
270#ifdef CONFIG_BOOKE
271
272extern u32 kvm_emulate_wrtee_branch_offs;
273extern u32 kvm_emulate_wrtee_reg_offs;
274extern u32 kvm_emulate_wrtee_orig_ins_offs;
275extern u32 kvm_emulate_wrtee_len;
276extern u32 kvm_emulate_wrtee[];
277
278static void kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one)
279{
280 u32 *p;
281 int distance_start;
282 int distance_end;
283 ulong next_inst;
284
285 p = kvm_alloc(kvm_emulate_wrtee_len * 4);
286 if (!p)
287 return;
288
289 /* Find out where we are and put everything there */
290 distance_start = (ulong)p - (ulong)inst;
291 next_inst = ((ulong)inst + 4);
292 distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs];
293
294 /* Make sure we only write valid b instructions */
295 if (distance_start > KVM_INST_B_MAX) {
296 kvm_patching_worked = false;
297 return;
298 }
299
300 /* Modify the chunk to fit the invocation */
301 memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4);
302 p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK;
303
304 if (imm_one) {
305 p[kvm_emulate_wrtee_reg_offs] =
306 KVM_INST_LI | __PPC_RT(R30) | MSR_EE;
307 } else {
308 /* Make clobbered registers work too */
309 switch (get_rt(rt)) {
310 case 30:
311 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
312 magic_var(scratch2), KVM_RT_30);
313 break;
314 case 31:
315 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
316 magic_var(scratch1), KVM_RT_30);
317 break;
318 default:
319 p[kvm_emulate_wrtee_reg_offs] |= rt;
320 break;
321 }
322 }
323
324 p[kvm_emulate_wrtee_orig_ins_offs] = *inst;
325 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4);
326
327 /* Patch the invocation */
328 kvm_patch_ins_b(inst, distance_start);
329}
330
331extern u32 kvm_emulate_wrteei_0_branch_offs;
332extern u32 kvm_emulate_wrteei_0_len;
333extern u32 kvm_emulate_wrteei_0[];
334
335static void kvm_patch_ins_wrteei_0(u32 *inst)
336{
337 u32 *p;
338 int distance_start;
339 int distance_end;
340 ulong next_inst;
341
342 p = kvm_alloc(kvm_emulate_wrteei_0_len * 4);
343 if (!p)
344 return;
345
346 /* Find out where we are and put everything there */
347 distance_start = (ulong)p - (ulong)inst;
348 next_inst = ((ulong)inst + 4);
349 distance_end = next_inst - (ulong)&p[kvm_emulate_wrteei_0_branch_offs];
350
351 /* Make sure we only write valid b instructions */
352 if (distance_start > KVM_INST_B_MAX) {
353 kvm_patching_worked = false;
354 return;
355 }
356
357 memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4);
358 p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK;
359 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4);
360
361 /* Patch the invocation */
362 kvm_patch_ins_b(inst, distance_start);
363}
364
365#endif
366
367#ifdef CONFIG_PPC_BOOK3S_32
368
369extern u32 kvm_emulate_mtsrin_branch_offs;
370extern u32 kvm_emulate_mtsrin_reg1_offs;
371extern u32 kvm_emulate_mtsrin_reg2_offs;
372extern u32 kvm_emulate_mtsrin_orig_ins_offs;
373extern u32 kvm_emulate_mtsrin_len;
374extern u32 kvm_emulate_mtsrin[];
375
376static void kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb)
377{
378 u32 *p;
379 int distance_start;
380 int distance_end;
381 ulong next_inst;
382
383 p = kvm_alloc(kvm_emulate_mtsrin_len * 4);
384 if (!p)
385 return;
386
387 /* Find out where we are and put everything there */
388 distance_start = (ulong)p - (ulong)inst;
389 next_inst = ((ulong)inst + 4);
390 distance_end = next_inst - (ulong)&p[kvm_emulate_mtsrin_branch_offs];
391
392 /* Make sure we only write valid b instructions */
393 if (distance_start > KVM_INST_B_MAX) {
394 kvm_patching_worked = false;
395 return;
396 }
397
398 /* Modify the chunk to fit the invocation */
399 memcpy(p, kvm_emulate_mtsrin, kvm_emulate_mtsrin_len * 4);
400 p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK;
401 p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10);
402 p[kvm_emulate_mtsrin_reg2_offs] |= rt;
403 p[kvm_emulate_mtsrin_orig_ins_offs] = *inst;
404 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4);
405
406 /* Patch the invocation */
407 kvm_patch_ins_b(inst, distance_start);
408}
409
410#endif
411
412static void kvm_map_magic_page(void *data)
413{
414 u32 *features = data;
415
416 ulong in[8] = {0};
417 ulong out[8];
418
419 in[0] = KVM_MAGIC_PAGE;
420 in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX;
421
422 epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE));
423
424 *features = out[0];
425}
426
427static void kvm_check_ins(u32 *inst, u32 features)
428{
429 u32 _inst = *inst;
430 u32 inst_no_rt = _inst & ~KVM_MASK_RT;
431 u32 inst_rt = _inst & KVM_MASK_RT;
432
433 switch (inst_no_rt) {
434 /* Loads */
435 case KVM_INST_MFMSR:
436 kvm_patch_ins_ld(inst, magic_var(msr), inst_rt);
437 break;
438 case KVM_INST_MFSPR(SPRN_SPRG0):
439 kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt);
440 break;
441 case KVM_INST_MFSPR(SPRN_SPRG1):
442 kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt);
443 break;
444 case KVM_INST_MFSPR(SPRN_SPRG2):
445 kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt);
446 break;
447 case KVM_INST_MFSPR(SPRN_SPRG3):
448 kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt);
449 break;
450 case KVM_INST_MFSPR(SPRN_SRR0):
451 kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt);
452 break;
453 case KVM_INST_MFSPR(SPRN_SRR1):
454 kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt);
455 break;
456#ifdef CONFIG_BOOKE
457 case KVM_INST_MFSPR(SPRN_DEAR):
458#else
459 case KVM_INST_MFSPR(SPRN_DAR):
460#endif
461 kvm_patch_ins_ld(inst, magic_var(dar), inst_rt);
462 break;
463 case KVM_INST_MFSPR(SPRN_DSISR):
464 kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt);
465 break;
466
467#ifdef CONFIG_PPC_BOOK3E_MMU
468 case KVM_INST_MFSPR(SPRN_MAS0):
469 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
470 kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt);
471 break;
472 case KVM_INST_MFSPR(SPRN_MAS1):
473 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
474 kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt);
475 break;
476 case KVM_INST_MFSPR(SPRN_MAS2):
477 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
478 kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt);
479 break;
480 case KVM_INST_MFSPR(SPRN_MAS3):
481 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
482 kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt);
483 break;
484 case KVM_INST_MFSPR(SPRN_MAS4):
485 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
486 kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt);
487 break;
488 case KVM_INST_MFSPR(SPRN_MAS6):
489 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
490 kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt);
491 break;
492 case KVM_INST_MFSPR(SPRN_MAS7):
493 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
494 kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt);
495 break;
496#endif /* CONFIG_PPC_BOOK3E_MMU */
497
498 case KVM_INST_MFSPR(SPRN_SPRG4):
499#ifdef CONFIG_BOOKE
500 case KVM_INST_MFSPR(SPRN_SPRG4R):
501#endif
502 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
503 kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt);
504 break;
505 case KVM_INST_MFSPR(SPRN_SPRG5):
506#ifdef CONFIG_BOOKE
507 case KVM_INST_MFSPR(SPRN_SPRG5R):
508#endif
509 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
510 kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt);
511 break;
512 case KVM_INST_MFSPR(SPRN_SPRG6):
513#ifdef CONFIG_BOOKE
514 case KVM_INST_MFSPR(SPRN_SPRG6R):
515#endif
516 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
517 kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt);
518 break;
519 case KVM_INST_MFSPR(SPRN_SPRG7):
520#ifdef CONFIG_BOOKE
521 case KVM_INST_MFSPR(SPRN_SPRG7R):
522#endif
523 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
524 kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt);
525 break;
526
527#ifdef CONFIG_BOOKE
528 case KVM_INST_MFSPR(SPRN_ESR):
529 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
530 kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt);
531 break;
532#endif
533
534 case KVM_INST_MFSPR(SPRN_PIR):
535 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
536 kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt);
537 break;
538
539
540 /* Stores */
541 case KVM_INST_MTSPR(SPRN_SPRG0):
542 kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt);
543 break;
544 case KVM_INST_MTSPR(SPRN_SPRG1):
545 kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt);
546 break;
547 case KVM_INST_MTSPR(SPRN_SPRG2):
548 kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt);
549 break;
550 case KVM_INST_MTSPR(SPRN_SPRG3):
551 kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt);
552 break;
553 case KVM_INST_MTSPR(SPRN_SRR0):
554 kvm_patch_ins_std(inst, magic_var(srr0), inst_rt);
555 break;
556 case KVM_INST_MTSPR(SPRN_SRR1):
557 kvm_patch_ins_std(inst, magic_var(srr1), inst_rt);
558 break;
559#ifdef CONFIG_BOOKE
560 case KVM_INST_MTSPR(SPRN_DEAR):
561#else
562 case KVM_INST_MTSPR(SPRN_DAR):
563#endif
564 kvm_patch_ins_std(inst, magic_var(dar), inst_rt);
565 break;
566 case KVM_INST_MTSPR(SPRN_DSISR):
567 kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt);
568 break;
569#ifdef CONFIG_PPC_BOOK3E_MMU
570 case KVM_INST_MTSPR(SPRN_MAS0):
571 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
572 kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt);
573 break;
574 case KVM_INST_MTSPR(SPRN_MAS1):
575 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
576 kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt);
577 break;
578 case KVM_INST_MTSPR(SPRN_MAS2):
579 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
580 kvm_patch_ins_std(inst, magic_var(mas2), inst_rt);
581 break;
582 case KVM_INST_MTSPR(SPRN_MAS3):
583 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
584 kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt);
585 break;
586 case KVM_INST_MTSPR(SPRN_MAS4):
587 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
588 kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt);
589 break;
590 case KVM_INST_MTSPR(SPRN_MAS6):
591 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
592 kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt);
593 break;
594 case KVM_INST_MTSPR(SPRN_MAS7):
595 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
596 kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt);
597 break;
598#endif /* CONFIG_PPC_BOOK3E_MMU */
599
600 case KVM_INST_MTSPR(SPRN_SPRG4):
601 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
602 kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt);
603 break;
604 case KVM_INST_MTSPR(SPRN_SPRG5):
605 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
606 kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt);
607 break;
608 case KVM_INST_MTSPR(SPRN_SPRG6):
609 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
610 kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt);
611 break;
612 case KVM_INST_MTSPR(SPRN_SPRG7):
613 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
614 kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt);
615 break;
616
617#ifdef CONFIG_BOOKE
618 case KVM_INST_MTSPR(SPRN_ESR):
619 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
620 kvm_patch_ins_stw(inst, magic_var(esr), inst_rt);
621 break;
622#endif
623
624 /* Nops */
625 case KVM_INST_TLBSYNC:
626 kvm_patch_ins_nop(inst);
627 break;
628
629 /* Rewrites */
630 case KVM_INST_MTMSRD_L1:
631 kvm_patch_ins_mtmsrd(inst, inst_rt);
632 break;
633 case KVM_INST_MTMSR:
634 case KVM_INST_MTMSRD_L0:
635 kvm_patch_ins_mtmsr(inst, inst_rt);
636 break;
637#ifdef CONFIG_BOOKE
638 case KVM_INST_WRTEE:
639 kvm_patch_ins_wrtee(inst, inst_rt, 0);
640 break;
641#endif
642 }
643
644 switch (inst_no_rt & ~KVM_MASK_RB) {
645#ifdef CONFIG_PPC_BOOK3S_32
646 case KVM_INST_MTSRIN:
647 if (features & KVM_MAGIC_FEAT_SR) {
648 u32 inst_rb = _inst & KVM_MASK_RB;
649 kvm_patch_ins_mtsrin(inst, inst_rt, inst_rb);
650 }
651 break;
652#endif
653 }
654
655 switch (_inst) {
656#ifdef CONFIG_BOOKE
657 case KVM_INST_WRTEEI_0:
658 kvm_patch_ins_wrteei_0(inst);
659 break;
660
661 case KVM_INST_WRTEEI_1:
662 kvm_patch_ins_wrtee(inst, 0, 1);
663 break;
664#endif
665 }
666}
667
668extern u32 kvm_template_start[];
669extern u32 kvm_template_end[];
670
671static void kvm_use_magic_page(void)
672{
673 u32 *p;
674 u32 *start, *end;
675 u32 tmp;
676 u32 features;
677
678 /* Tell the host to map the magic page to -4096 on all CPUs */
679 on_each_cpu(kvm_map_magic_page, &features, 1);
680
681 /* Quick self-test to see if the mapping works */
682 if (__get_user(tmp, (u32*)KVM_MAGIC_PAGE)) {
683 kvm_patching_worked = false;
684 return;
685 }
686
687 /* Now loop through all code and find instructions */
688 start = (void*)_stext;
689 end = (void*)_etext;
690
691 /*
692 * Being interrupted in the middle of patching would
693 * be bad for SPRG4-7, which KVM can't keep in sync
694 * with emulated accesses because reads don't trap.
695 */
696 local_irq_disable();
697
698 for (p = start; p < end; p++) {
699 /* Avoid patching the template code */
700 if (p >= kvm_template_start && p < kvm_template_end) {
701 p = kvm_template_end - 1;
702 continue;
703 }
704 kvm_check_ins(p, features);
705 }
706
707 local_irq_enable();
708
709 printk(KERN_INFO "KVM: Live patching for a fast VM %s\n",
710 kvm_patching_worked ? "worked" : "failed");
711}
712
713static __init void kvm_free_tmp(void)
714{
715 free_reserved_area(&kvm_tmp[kvm_tmp_index],
716 &kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL);
717}
718
719static int __init kvm_guest_init(void)
720{
721 if (!kvm_para_available())
722 goto free_tmp;
723
724 if (!epapr_paravirt_enabled)
725 goto free_tmp;
726
727 if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))
728 kvm_use_magic_page();
729
730#ifdef CONFIG_PPC_BOOK3S_64
731 /* Enable napping */
732 powersave_nap = 1;
733#endif
734
735free_tmp:
736 kvm_free_tmp();
737
738 return 0;
739}
740
741postcore_initcall(kvm_guest_init);
Linux 6.x block layer and io_uring tree(s)