2 * Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
3 * Copyright 2010-2011 Freescale Semiconductor, Inc.
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.
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.
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.
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>
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>
36 #define KVM_MAGIC_PAGE (-4096L)
37 #define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
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
49 #define KVM_MASK_RT 0x03e00000
50 #define KVM_RT_30 0x03c00000
51 #define KVM_MASK_RB 0x0000f800
52 #define KVM_INST_MFMSR 0x7c0000a6
57 #define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \
58 (((sprn) & 0x1f) << 16) | \
59 (((sprn) & 0x3e0) << 6) | \
62 #define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM)
63 #define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO)
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
70 #define KVM_INST_WRTEE 0x7c000106
71 #define KVM_INST_WRTEEI_0 0x7c000146
72 #define KVM_INST_WRTEEI_1 0x7c008146
74 #define KVM_INST_MTSRIN 0x7c0001e4
76 static bool kvm_patching_worked = true;
77 char kvm_tmp[1024 * 1024];
78 static int kvm_tmp_index;
80 static inline void kvm_patch_ins(u32 *inst, u32 new_inst)
83 flush_icache_range((ulong)inst, (ulong)inst + 4);
86 static void kvm_patch_ins_ll(u32 *inst, long addr, u32 rt)
89 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
91 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc));
95 static void kvm_patch_ins_ld(u32 *inst, long addr, u32 rt)
98 kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
100 kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc));
104 static void kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt)
106 kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff));
109 static void kvm_patch_ins_std(u32 *inst, long addr, u32 rt)
112 kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc));
114 kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc));
118 static void kvm_patch_ins_stw(u32 *inst, long addr, u32 rt)
120 kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc));
123 static void kvm_patch_ins_nop(u32 *inst)
125 kvm_patch_ins(inst, KVM_INST_NOP);
128 static void kvm_patch_ins_b(u32 *inst, int addr)
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 */
134 if ((ulong)inst < (ulong)&__end_interrupts)
138 kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
141 static u32 *kvm_alloc(int len)
145 if ((kvm_tmp_index + len) > ARRAY_SIZE(kvm_tmp)) {
146 printk(KERN_ERR "KVM: No more space (%d + %d)\n",
148 kvm_patching_worked = false;
152 p = (void*)&kvm_tmp[kvm_tmp_index];
153 kvm_tmp_index += len;
158 extern u32 kvm_emulate_mtmsrd_branch_offs;
159 extern u32 kvm_emulate_mtmsrd_reg_offs;
160 extern u32 kvm_emulate_mtmsrd_orig_ins_offs;
161 extern u32 kvm_emulate_mtmsrd_len;
162 extern u32 kvm_emulate_mtmsrd[];
164 static void kvm_patch_ins_mtmsrd(u32 *inst, u32 rt)
171 p = kvm_alloc(kvm_emulate_mtmsrd_len * 4);
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];
180 /* Make sure we only write valid b instructions */
181 if (distance_start > KVM_INST_B_MAX) {
182 kvm_patching_worked = false;
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)) {
191 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
192 magic_var(scratch2), KVM_RT_30);
195 kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
196 magic_var(scratch1), KVM_RT_30);
199 p[kvm_emulate_mtmsrd_reg_offs] |= rt;
203 p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst;
204 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4);
206 /* Patch the invocation */
207 kvm_patch_ins_b(inst, distance_start);
210 extern u32 kvm_emulate_mtmsr_branch_offs;
211 extern u32 kvm_emulate_mtmsr_reg1_offs;
212 extern u32 kvm_emulate_mtmsr_reg2_offs;
213 extern u32 kvm_emulate_mtmsr_orig_ins_offs;
214 extern u32 kvm_emulate_mtmsr_len;
215 extern u32 kvm_emulate_mtmsr[];
217 static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
224 p = kvm_alloc(kvm_emulate_mtmsr_len * 4);
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];
233 /* Make sure we only write valid b instructions */
234 if (distance_start > KVM_INST_B_MAX) {
235 kvm_patching_worked = false;
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;
243 /* Make clobbered registers work too */
244 switch (get_rt(rt)) {
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);
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);
258 p[kvm_emulate_mtmsr_reg1_offs] |= rt;
259 p[kvm_emulate_mtmsr_reg2_offs] |= rt;
263 p[kvm_emulate_mtmsr_orig_ins_offs] = *inst;
264 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4);
266 /* Patch the invocation */
267 kvm_patch_ins_b(inst, distance_start);
272 extern u32 kvm_emulate_wrtee_branch_offs;
273 extern u32 kvm_emulate_wrtee_reg_offs;
274 extern u32 kvm_emulate_wrtee_orig_ins_offs;
275 extern u32 kvm_emulate_wrtee_len;
276 extern u32 kvm_emulate_wrtee[];
278 static void kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one)
285 p = kvm_alloc(kvm_emulate_wrtee_len * 4);
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];
294 /* Make sure we only write valid b instructions */
295 if (distance_start > KVM_INST_B_MAX) {
296 kvm_patching_worked = false;
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;
305 p[kvm_emulate_wrtee_reg_offs] =
306 KVM_INST_LI | __PPC_RT(R30) | MSR_EE;
308 /* Make clobbered registers work too */
309 switch (get_rt(rt)) {
311 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
312 magic_var(scratch2), KVM_RT_30);
315 kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
316 magic_var(scratch1), KVM_RT_30);
319 p[kvm_emulate_wrtee_reg_offs] |= rt;
324 p[kvm_emulate_wrtee_orig_ins_offs] = *inst;
325 flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4);
327 /* Patch the invocation */
328 kvm_patch_ins_b(inst, distance_start);
331 extern u32 kvm_emulate_wrteei_0_branch_offs;
332 extern u32 kvm_emulate_wrteei_0_len;
333 extern u32 kvm_emulate_wrteei_0[];
335 static void kvm_patch_ins_wrteei_0(u32 *inst)
342 p = kvm_alloc(kvm_emulate_wrteei_0_len * 4);
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];
351 /* Make sure we only write valid b instructions */
352 if (distance_start > KVM_INST_B_MAX) {
353 kvm_patching_worked = false;
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);
361 /* Patch the invocation */
362 kvm_patch_ins_b(inst, distance_start);
367 #ifdef CONFIG_PPC_BOOK3S_32
369 extern u32 kvm_emulate_mtsrin_branch_offs;
370 extern u32 kvm_emulate_mtsrin_reg1_offs;
371 extern u32 kvm_emulate_mtsrin_reg2_offs;
372 extern u32 kvm_emulate_mtsrin_orig_ins_offs;
373 extern u32 kvm_emulate_mtsrin_len;
374 extern u32 kvm_emulate_mtsrin[];
376 static void kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb)
383 p = kvm_alloc(kvm_emulate_mtsrin_len * 4);
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];
392 /* Make sure we only write valid b instructions */
393 if (distance_start > KVM_INST_B_MAX) {
394 kvm_patching_worked = false;
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);
406 /* Patch the invocation */
407 kvm_patch_ins_b(inst, distance_start);
412 static void kvm_map_magic_page(void *data)
414 u32 *features = data;
419 in[0] = KVM_MAGIC_PAGE;
420 in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX;
422 epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE));
427 static void kvm_check_ins(u32 *inst, u32 features)
430 u32 inst_no_rt = _inst & ~KVM_MASK_RT;
431 u32 inst_rt = _inst & KVM_MASK_RT;
433 switch (inst_no_rt) {
436 kvm_patch_ins_ld(inst, magic_var(msr), inst_rt);
438 case KVM_INST_MFSPR(SPRN_SPRG0):
439 kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt);
441 case KVM_INST_MFSPR(SPRN_SPRG1):
442 kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt);
444 case KVM_INST_MFSPR(SPRN_SPRG2):
445 kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt);
447 case KVM_INST_MFSPR(SPRN_SPRG3):
448 kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt);
450 case KVM_INST_MFSPR(SPRN_SRR0):
451 kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt);
453 case KVM_INST_MFSPR(SPRN_SRR1):
454 kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt);
457 case KVM_INST_MFSPR(SPRN_DEAR):
459 case KVM_INST_MFSPR(SPRN_DAR):
461 kvm_patch_ins_ld(inst, magic_var(dar), inst_rt);
463 case KVM_INST_MFSPR(SPRN_DSISR):
464 kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt);
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);
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);
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);
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);
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);
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);
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);
496 #endif /* CONFIG_PPC_BOOK3E_MMU */
498 case KVM_INST_MFSPR(SPRN_SPRG4):
500 case KVM_INST_MFSPR(SPRN_SPRG4R):
502 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
503 kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt);
505 case KVM_INST_MFSPR(SPRN_SPRG5):
507 case KVM_INST_MFSPR(SPRN_SPRG5R):
509 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
510 kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt);
512 case KVM_INST_MFSPR(SPRN_SPRG6):
514 case KVM_INST_MFSPR(SPRN_SPRG6R):
516 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
517 kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt);
519 case KVM_INST_MFSPR(SPRN_SPRG7):
521 case KVM_INST_MFSPR(SPRN_SPRG7R):
523 if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
524 kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt);
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);
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);
541 case KVM_INST_MTSPR(SPRN_SPRG0):
542 kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt);
544 case KVM_INST_MTSPR(SPRN_SPRG1):
545 kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt);
547 case KVM_INST_MTSPR(SPRN_SPRG2):
548 kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt);
550 case KVM_INST_MTSPR(SPRN_SPRG3):
551 kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt);
553 case KVM_INST_MTSPR(SPRN_SRR0):
554 kvm_patch_ins_std(inst, magic_var(srr0), inst_rt);
556 case KVM_INST_MTSPR(SPRN_SRR1):
557 kvm_patch_ins_std(inst, magic_var(srr1), inst_rt);
560 case KVM_INST_MTSPR(SPRN_DEAR):
562 case KVM_INST_MTSPR(SPRN_DAR):
564 kvm_patch_ins_std(inst, magic_var(dar), inst_rt);
566 case KVM_INST_MTSPR(SPRN_DSISR):
567 kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt);
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);
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);
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);
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);
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);
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);
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);
598 #endif /* CONFIG_PPC_BOOK3E_MMU */
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);
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);
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);
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);
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);
625 case KVM_INST_TLBSYNC:
626 kvm_patch_ins_nop(inst);
630 case KVM_INST_MTMSRD_L1:
631 kvm_patch_ins_mtmsrd(inst, inst_rt);
634 case KVM_INST_MTMSRD_L0:
635 kvm_patch_ins_mtmsr(inst, inst_rt);
639 kvm_patch_ins_wrtee(inst, inst_rt, 0);
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);
657 case KVM_INST_WRTEEI_0:
658 kvm_patch_ins_wrteei_0(inst);
661 case KVM_INST_WRTEEI_1:
662 kvm_patch_ins_wrtee(inst, 0, 1);
668 extern u32 kvm_template_start[];
669 extern u32 kvm_template_end[];
671 static void kvm_use_magic_page(void)
678 /* Tell the host to map the magic page to -4096 on all CPUs */
679 on_each_cpu(kvm_map_magic_page, &features, 1);
681 /* Quick self-test to see if the mapping works */
682 if (__get_user(tmp, (u32*)KVM_MAGIC_PAGE)) {
683 kvm_patching_worked = false;
687 /* Now loop through all code and find instructions */
688 start = (void*)_stext;
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.
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;
704 kvm_check_ins(p, features);
709 printk(KERN_INFO "KVM: Live patching for a fast VM %s\n",
710 kvm_patching_worked ? "worked" : "failed");
713 static __init void kvm_free_tmp(void)
715 free_reserved_area(&kvm_tmp[kvm_tmp_index],
716 &kvm_tmp[ARRAY_SIZE(kvm_tmp)], -1, NULL);
719 static int __init kvm_guest_init(void)
721 if (!kvm_para_available())
724 if (!epapr_paravirt_enabled)
727 if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))
728 kvm_use_magic_page();
730 #ifdef CONFIG_PPC_BOOK3S_64
741 postcore_initcall(kvm_guest_init);