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Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-eoan-kernel.git] / arch / powerpc / kvm / book3s_pr.c
1 /*
2 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
3 *
4 * Authors:
5 * Alexander Graf <agraf@suse.de>
6 * Kevin Wolf <mail@kevin-wolf.de>
7 * Paul Mackerras <paulus@samba.org>
8 *
9 * Description:
10 * Functions relating to running KVM on Book 3S processors where
11 * we don't have access to hypervisor mode, and we run the guest
12 * in problem state (user mode).
13 *
14 * This file is derived from arch/powerpc/kvm/44x.c,
15 * by Hollis Blanchard <hollisb@us.ibm.com>.
16 *
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License, version 2, as
19 * published by the Free Software Foundation.
20 */
21
22 #include <linux/kvm_host.h>
23 #include <linux/export.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26
27 #include <asm/reg.h>
28 #include <asm/cputable.h>
29 #include <asm/cacheflush.h>
30 #include <asm/tlbflush.h>
31 #include <asm/uaccess.h>
32 #include <asm/io.h>
33 #include <asm/kvm_ppc.h>
34 #include <asm/kvm_book3s.h>
35 #include <asm/mmu_context.h>
36 #include <linux/gfp.h>
37 #include <linux/sched.h>
38 #include <linux/vmalloc.h>
39 #include <linux/highmem.h>
40
41 #include "trace.h"
42
43 /* #define EXIT_DEBUG */
44 /* #define DEBUG_EXT */
45
46 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
47 ulong msr);
48
49 /* Some compatibility defines */
50 #ifdef CONFIG_PPC_BOOK3S_32
51 #define MSR_USER32 MSR_USER
52 #define MSR_USER64 MSR_USER
53 #define HW_PAGE_SIZE PAGE_SIZE
54 #endif
55
56 void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
57 {
58 #ifdef CONFIG_PPC_BOOK3S_64
59 memcpy(to_svcpu(vcpu)->slb, to_book3s(vcpu)->slb_shadow, sizeof(to_svcpu(vcpu)->slb));
60 memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
61 sizeof(get_paca()->shadow_vcpu));
62 to_svcpu(vcpu)->slb_max = to_book3s(vcpu)->slb_shadow_max;
63 #endif
64
65 #ifdef CONFIG_PPC_BOOK3S_32
66 current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
67 #endif
68 }
69
70 void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
71 {
72 #ifdef CONFIG_PPC_BOOK3S_64
73 memcpy(to_book3s(vcpu)->slb_shadow, to_svcpu(vcpu)->slb, sizeof(to_svcpu(vcpu)->slb));
74 memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
75 sizeof(get_paca()->shadow_vcpu));
76 to_book3s(vcpu)->slb_shadow_max = to_svcpu(vcpu)->slb_max;
77 #endif
78
79 kvmppc_giveup_ext(vcpu, MSR_FP);
80 kvmppc_giveup_ext(vcpu, MSR_VEC);
81 kvmppc_giveup_ext(vcpu, MSR_VSX);
82 }
83
84 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
85 {
86 ulong smsr = vcpu->arch.shared->msr;
87
88 /* Guest MSR values */
89 smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
90 /* Process MSR values */
91 smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
92 /* External providers the guest reserved */
93 smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
94 /* 64-bit Process MSR values */
95 #ifdef CONFIG_PPC_BOOK3S_64
96 smsr |= MSR_ISF | MSR_HV;
97 #endif
98 vcpu->arch.shadow_msr = smsr;
99 }
100
101 void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
102 {
103 ulong old_msr = vcpu->arch.shared->msr;
104
105 #ifdef EXIT_DEBUG
106 printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
107 #endif
108
109 msr &= to_book3s(vcpu)->msr_mask;
110 vcpu->arch.shared->msr = msr;
111 kvmppc_recalc_shadow_msr(vcpu);
112
113 if (msr & MSR_POW) {
114 if (!vcpu->arch.pending_exceptions) {
115 kvm_vcpu_block(vcpu);
116 vcpu->stat.halt_wakeup++;
117
118 /* Unset POW bit after we woke up */
119 msr &= ~MSR_POW;
120 vcpu->arch.shared->msr = msr;
121 }
122 }
123
124 if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
125 (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
126 kvmppc_mmu_flush_segments(vcpu);
127 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
128
129 /* Preload magic page segment when in kernel mode */
130 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
131 struct kvm_vcpu_arch *a = &vcpu->arch;
132
133 if (msr & MSR_DR)
134 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
135 else
136 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
137 }
138 }
139
140 /* Preload FPU if it's enabled */
141 if (vcpu->arch.shared->msr & MSR_FP)
142 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
143 }
144
145 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
146 {
147 u32 host_pvr;
148
149 vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
150 vcpu->arch.pvr = pvr;
151 #ifdef CONFIG_PPC_BOOK3S_64
152 if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
153 kvmppc_mmu_book3s_64_init(vcpu);
154 to_book3s(vcpu)->hior = 0xfff00000;
155 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
156 vcpu->arch.cpu_type = KVM_CPU_3S_64;
157 } else
158 #endif
159 {
160 kvmppc_mmu_book3s_32_init(vcpu);
161 to_book3s(vcpu)->hior = 0;
162 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
163 vcpu->arch.cpu_type = KVM_CPU_3S_32;
164 }
165
166 kvmppc_sanity_check(vcpu);
167
168 /* If we are in hypervisor level on 970, we can tell the CPU to
169 * treat DCBZ as 32 bytes store */
170 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
171 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
172 !strcmp(cur_cpu_spec->platform, "ppc970"))
173 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
174
175 /* Cell performs badly if MSR_FEx are set. So let's hope nobody
176 really needs them in a VM on Cell and force disable them. */
177 if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
178 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
179
180 #ifdef CONFIG_PPC_BOOK3S_32
181 /* 32 bit Book3S always has 32 byte dcbz */
182 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
183 #endif
184
185 /* On some CPUs we can execute paired single operations natively */
186 asm ( "mfpvr %0" : "=r"(host_pvr));
187 switch (host_pvr) {
188 case 0x00080200: /* lonestar 2.0 */
189 case 0x00088202: /* lonestar 2.2 */
190 case 0x70000100: /* gekko 1.0 */
191 case 0x00080100: /* gekko 2.0 */
192 case 0x00083203: /* gekko 2.3a */
193 case 0x00083213: /* gekko 2.3b */
194 case 0x00083204: /* gekko 2.4 */
195 case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */
196 case 0x00087200: /* broadway */
197 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
198 /* Enable HID2.PSE - in case we need it later */
199 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
200 }
201 }
202
203 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
204 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
205 * emulate 32 bytes dcbz length.
206 *
207 * The Book3s_64 inventors also realized this case and implemented a special bit
208 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
209 *
210 * My approach here is to patch the dcbz instruction on executing pages.
211 */
212 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
213 {
214 struct page *hpage;
215 u64 hpage_offset;
216 u32 *page;
217 int i;
218
219 hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
220 if (is_error_page(hpage)) {
221 kvm_release_page_clean(hpage);
222 return;
223 }
224
225 hpage_offset = pte->raddr & ~PAGE_MASK;
226 hpage_offset &= ~0xFFFULL;
227 hpage_offset /= 4;
228
229 get_page(hpage);
230 page = kmap_atomic(hpage, KM_USER0);
231
232 /* patch dcbz into reserved instruction, so we trap */
233 for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
234 if ((page[i] & 0xff0007ff) == INS_DCBZ)
235 page[i] &= 0xfffffff7;
236
237 kunmap_atomic(page, KM_USER0);
238 put_page(hpage);
239 }
240
241 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
242 {
243 ulong mp_pa = vcpu->arch.magic_page_pa;
244
245 if (unlikely(mp_pa) &&
246 unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
247 return 1;
248 }
249
250 return kvm_is_visible_gfn(vcpu->kvm, gfn);
251 }
252
253 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
254 ulong eaddr, int vec)
255 {
256 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
257 int r = RESUME_GUEST;
258 int relocated;
259 int page_found = 0;
260 struct kvmppc_pte pte;
261 bool is_mmio = false;
262 bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
263 bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
264 u64 vsid;
265
266 relocated = data ? dr : ir;
267
268 /* Resolve real address if translation turned on */
269 if (relocated) {
270 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
271 } else {
272 pte.may_execute = true;
273 pte.may_read = true;
274 pte.may_write = true;
275 pte.raddr = eaddr & KVM_PAM;
276 pte.eaddr = eaddr;
277 pte.vpage = eaddr >> 12;
278 }
279
280 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
281 case 0:
282 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
283 break;
284 case MSR_DR:
285 case MSR_IR:
286 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
287
288 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
289 pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
290 else
291 pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
292 pte.vpage |= vsid;
293
294 if (vsid == -1)
295 page_found = -EINVAL;
296 break;
297 }
298
299 if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
300 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
301 /*
302 * If we do the dcbz hack, we have to NX on every execution,
303 * so we can patch the executing code. This renders our guest
304 * NX-less.
305 */
306 pte.may_execute = !data;
307 }
308
309 if (page_found == -ENOENT) {
310 /* Page not found in guest PTE entries */
311 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
312 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
313 vcpu->arch.shared->msr |=
314 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
315 kvmppc_book3s_queue_irqprio(vcpu, vec);
316 } else if (page_found == -EPERM) {
317 /* Storage protection */
318 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
319 vcpu->arch.shared->dsisr =
320 to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE;
321 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
322 vcpu->arch.shared->msr |=
323 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
324 kvmppc_book3s_queue_irqprio(vcpu, vec);
325 } else if (page_found == -EINVAL) {
326 /* Page not found in guest SLB */
327 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
328 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
329 } else if (!is_mmio &&
330 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
331 /* The guest's PTE is not mapped yet. Map on the host */
332 kvmppc_mmu_map_page(vcpu, &pte);
333 if (data)
334 vcpu->stat.sp_storage++;
335 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
336 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
337 kvmppc_patch_dcbz(vcpu, &pte);
338 } else {
339 /* MMIO */
340 vcpu->stat.mmio_exits++;
341 vcpu->arch.paddr_accessed = pte.raddr;
342 r = kvmppc_emulate_mmio(run, vcpu);
343 if ( r == RESUME_HOST_NV )
344 r = RESUME_HOST;
345 }
346
347 return r;
348 }
349
350 static inline int get_fpr_index(int i)
351 {
352 #ifdef CONFIG_VSX
353 i *= 2;
354 #endif
355 return i;
356 }
357
358 /* Give up external provider (FPU, Altivec, VSX) */
359 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
360 {
361 struct thread_struct *t = &current->thread;
362 u64 *vcpu_fpr = vcpu->arch.fpr;
363 #ifdef CONFIG_VSX
364 u64 *vcpu_vsx = vcpu->arch.vsr;
365 #endif
366 u64 *thread_fpr = (u64*)t->fpr;
367 int i;
368
369 if (!(vcpu->arch.guest_owned_ext & msr))
370 return;
371
372 #ifdef DEBUG_EXT
373 printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
374 #endif
375
376 switch (msr) {
377 case MSR_FP:
378 giveup_fpu(current);
379 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
380 vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
381
382 vcpu->arch.fpscr = t->fpscr.val;
383 break;
384 case MSR_VEC:
385 #ifdef CONFIG_ALTIVEC
386 giveup_altivec(current);
387 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
388 vcpu->arch.vscr = t->vscr;
389 #endif
390 break;
391 case MSR_VSX:
392 #ifdef CONFIG_VSX
393 __giveup_vsx(current);
394 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
395 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
396 #endif
397 break;
398 default:
399 BUG();
400 }
401
402 vcpu->arch.guest_owned_ext &= ~msr;
403 current->thread.regs->msr &= ~msr;
404 kvmppc_recalc_shadow_msr(vcpu);
405 }
406
407 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
408 {
409 ulong srr0 = kvmppc_get_pc(vcpu);
410 u32 last_inst = kvmppc_get_last_inst(vcpu);
411 int ret;
412
413 ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
414 if (ret == -ENOENT) {
415 ulong msr = vcpu->arch.shared->msr;
416
417 msr = kvmppc_set_field(msr, 33, 33, 1);
418 msr = kvmppc_set_field(msr, 34, 36, 0);
419 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
420 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
421 return EMULATE_AGAIN;
422 }
423
424 return EMULATE_DONE;
425 }
426
427 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
428 {
429
430 /* Need to do paired single emulation? */
431 if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
432 return EMULATE_DONE;
433
434 /* Read out the instruction */
435 if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
436 /* Need to emulate */
437 return EMULATE_FAIL;
438
439 return EMULATE_AGAIN;
440 }
441
442 /* Handle external providers (FPU, Altivec, VSX) */
443 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
444 ulong msr)
445 {
446 struct thread_struct *t = &current->thread;
447 u64 *vcpu_fpr = vcpu->arch.fpr;
448 #ifdef CONFIG_VSX
449 u64 *vcpu_vsx = vcpu->arch.vsr;
450 #endif
451 u64 *thread_fpr = (u64*)t->fpr;
452 int i;
453
454 /* When we have paired singles, we emulate in software */
455 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
456 return RESUME_GUEST;
457
458 if (!(vcpu->arch.shared->msr & msr)) {
459 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
460 return RESUME_GUEST;
461 }
462
463 /* We already own the ext */
464 if (vcpu->arch.guest_owned_ext & msr) {
465 return RESUME_GUEST;
466 }
467
468 #ifdef DEBUG_EXT
469 printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
470 #endif
471
472 current->thread.regs->msr |= msr;
473
474 switch (msr) {
475 case MSR_FP:
476 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
477 thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
478
479 t->fpscr.val = vcpu->arch.fpscr;
480 t->fpexc_mode = 0;
481 kvmppc_load_up_fpu();
482 break;
483 case MSR_VEC:
484 #ifdef CONFIG_ALTIVEC
485 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
486 t->vscr = vcpu->arch.vscr;
487 t->vrsave = -1;
488 kvmppc_load_up_altivec();
489 #endif
490 break;
491 case MSR_VSX:
492 #ifdef CONFIG_VSX
493 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
494 thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
495 kvmppc_load_up_vsx();
496 #endif
497 break;
498 default:
499 BUG();
500 }
501
502 vcpu->arch.guest_owned_ext |= msr;
503
504 kvmppc_recalc_shadow_msr(vcpu);
505
506 return RESUME_GUEST;
507 }
508
509 int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
510 unsigned int exit_nr)
511 {
512 int r = RESUME_HOST;
513
514 vcpu->stat.sum_exits++;
515
516 run->exit_reason = KVM_EXIT_UNKNOWN;
517 run->ready_for_interrupt_injection = 1;
518
519 trace_kvm_book3s_exit(exit_nr, vcpu);
520 kvm_resched(vcpu);
521 switch (exit_nr) {
522 case BOOK3S_INTERRUPT_INST_STORAGE:
523 vcpu->stat.pf_instruc++;
524
525 #ifdef CONFIG_PPC_BOOK3S_32
526 /* We set segments as unused segments when invalidating them. So
527 * treat the respective fault as segment fault. */
528 if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT]
529 == SR_INVALID) {
530 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
531 r = RESUME_GUEST;
532 break;
533 }
534 #endif
535
536 /* only care about PTEG not found errors, but leave NX alone */
537 if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) {
538 r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
539 vcpu->stat.sp_instruc++;
540 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
541 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
542 /*
543 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
544 * so we can't use the NX bit inside the guest. Let's cross our fingers,
545 * that no guest that needs the dcbz hack does NX.
546 */
547 kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
548 r = RESUME_GUEST;
549 } else {
550 vcpu->arch.shared->msr |=
551 to_svcpu(vcpu)->shadow_srr1 & 0x58000000;
552 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
553 r = RESUME_GUEST;
554 }
555 break;
556 case BOOK3S_INTERRUPT_DATA_STORAGE:
557 {
558 ulong dar = kvmppc_get_fault_dar(vcpu);
559 vcpu->stat.pf_storage++;
560
561 #ifdef CONFIG_PPC_BOOK3S_32
562 /* We set segments as unused segments when invalidating them. So
563 * treat the respective fault as segment fault. */
564 if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) {
565 kvmppc_mmu_map_segment(vcpu, dar);
566 r = RESUME_GUEST;
567 break;
568 }
569 #endif
570
571 /* The only case we need to handle is missing shadow PTEs */
572 if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) {
573 r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
574 } else {
575 vcpu->arch.shared->dar = dar;
576 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
577 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
578 r = RESUME_GUEST;
579 }
580 break;
581 }
582 case BOOK3S_INTERRUPT_DATA_SEGMENT:
583 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
584 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
585 kvmppc_book3s_queue_irqprio(vcpu,
586 BOOK3S_INTERRUPT_DATA_SEGMENT);
587 }
588 r = RESUME_GUEST;
589 break;
590 case BOOK3S_INTERRUPT_INST_SEGMENT:
591 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
592 kvmppc_book3s_queue_irqprio(vcpu,
593 BOOK3S_INTERRUPT_INST_SEGMENT);
594 }
595 r = RESUME_GUEST;
596 break;
597 /* We're good on these - the host merely wanted to get our attention */
598 case BOOK3S_INTERRUPT_DECREMENTER:
599 vcpu->stat.dec_exits++;
600 r = RESUME_GUEST;
601 break;
602 case BOOK3S_INTERRUPT_EXTERNAL:
603 vcpu->stat.ext_intr_exits++;
604 r = RESUME_GUEST;
605 break;
606 case BOOK3S_INTERRUPT_PERFMON:
607 r = RESUME_GUEST;
608 break;
609 case BOOK3S_INTERRUPT_PROGRAM:
610 {
611 enum emulation_result er;
612 ulong flags;
613
614 program_interrupt:
615 flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull;
616
617 if (vcpu->arch.shared->msr & MSR_PR) {
618 #ifdef EXIT_DEBUG
619 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
620 #endif
621 if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
622 (INS_DCBZ & 0xfffffff7)) {
623 kvmppc_core_queue_program(vcpu, flags);
624 r = RESUME_GUEST;
625 break;
626 }
627 }
628
629 vcpu->stat.emulated_inst_exits++;
630 er = kvmppc_emulate_instruction(run, vcpu);
631 switch (er) {
632 case EMULATE_DONE:
633 r = RESUME_GUEST_NV;
634 break;
635 case EMULATE_AGAIN:
636 r = RESUME_GUEST;
637 break;
638 case EMULATE_FAIL:
639 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
640 __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
641 kvmppc_core_queue_program(vcpu, flags);
642 r = RESUME_GUEST;
643 break;
644 case EMULATE_DO_MMIO:
645 run->exit_reason = KVM_EXIT_MMIO;
646 r = RESUME_HOST_NV;
647 break;
648 default:
649 BUG();
650 }
651 break;
652 }
653 case BOOK3S_INTERRUPT_SYSCALL:
654 if (vcpu->arch.papr_enabled &&
655 (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
656 !(vcpu->arch.shared->msr & MSR_PR)) {
657 /* SC 1 papr hypercalls */
658 ulong cmd = kvmppc_get_gpr(vcpu, 3);
659 int i;
660
661 if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
662 r = RESUME_GUEST;
663 break;
664 }
665
666 run->papr_hcall.nr = cmd;
667 for (i = 0; i < 9; ++i) {
668 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
669 run->papr_hcall.args[i] = gpr;
670 }
671 run->exit_reason = KVM_EXIT_PAPR_HCALL;
672 vcpu->arch.hcall_needed = 1;
673 r = RESUME_HOST;
674 } else if (vcpu->arch.osi_enabled &&
675 (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
676 (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
677 /* MOL hypercalls */
678 u64 *gprs = run->osi.gprs;
679 int i;
680
681 run->exit_reason = KVM_EXIT_OSI;
682 for (i = 0; i < 32; i++)
683 gprs[i] = kvmppc_get_gpr(vcpu, i);
684 vcpu->arch.osi_needed = 1;
685 r = RESUME_HOST_NV;
686 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
687 (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
688 /* KVM PV hypercalls */
689 kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
690 r = RESUME_GUEST;
691 } else {
692 /* Guest syscalls */
693 vcpu->stat.syscall_exits++;
694 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
695 r = RESUME_GUEST;
696 }
697 break;
698 case BOOK3S_INTERRUPT_FP_UNAVAIL:
699 case BOOK3S_INTERRUPT_ALTIVEC:
700 case BOOK3S_INTERRUPT_VSX:
701 {
702 int ext_msr = 0;
703
704 switch (exit_nr) {
705 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break;
706 case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break;
707 case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break;
708 }
709
710 switch (kvmppc_check_ext(vcpu, exit_nr)) {
711 case EMULATE_DONE:
712 /* everything ok - let's enable the ext */
713 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
714 break;
715 case EMULATE_FAIL:
716 /* we need to emulate this instruction */
717 goto program_interrupt;
718 break;
719 default:
720 /* nothing to worry about - go again */
721 break;
722 }
723 break;
724 }
725 case BOOK3S_INTERRUPT_ALIGNMENT:
726 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
727 vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
728 kvmppc_get_last_inst(vcpu));
729 vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
730 kvmppc_get_last_inst(vcpu));
731 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
732 }
733 r = RESUME_GUEST;
734 break;
735 case BOOK3S_INTERRUPT_MACHINE_CHECK:
736 case BOOK3S_INTERRUPT_TRACE:
737 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
738 r = RESUME_GUEST;
739 break;
740 default:
741 /* Ugh - bork here! What did we get? */
742 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
743 exit_nr, kvmppc_get_pc(vcpu), to_svcpu(vcpu)->shadow_srr1);
744 r = RESUME_HOST;
745 BUG();
746 break;
747 }
748
749
750 if (!(r & RESUME_HOST)) {
751 /* To avoid clobbering exit_reason, only check for signals if
752 * we aren't already exiting to userspace for some other
753 * reason. */
754 if (signal_pending(current)) {
755 #ifdef EXIT_DEBUG
756 printk(KERN_EMERG "KVM: Going back to host\n");
757 #endif
758 vcpu->stat.signal_exits++;
759 run->exit_reason = KVM_EXIT_INTR;
760 r = -EINTR;
761 } else {
762 /* In case an interrupt came in that was triggered
763 * from userspace (like DEC), we need to check what
764 * to inject now! */
765 kvmppc_core_deliver_interrupts(vcpu);
766 }
767 }
768
769 trace_kvm_book3s_reenter(r, vcpu);
770
771 return r;
772 }
773
774 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
775 struct kvm_sregs *sregs)
776 {
777 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
778 int i;
779
780 sregs->pvr = vcpu->arch.pvr;
781
782 sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
783 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
784 for (i = 0; i < 64; i++) {
785 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
786 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
787 }
788 } else {
789 for (i = 0; i < 16; i++)
790 sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
791
792 for (i = 0; i < 8; i++) {
793 sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
794 sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
795 }
796 }
797
798 return 0;
799 }
800
801 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
802 struct kvm_sregs *sregs)
803 {
804 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
805 int i;
806
807 kvmppc_set_pvr(vcpu, sregs->pvr);
808
809 vcpu3s->sdr1 = sregs->u.s.sdr1;
810 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
811 for (i = 0; i < 64; i++) {
812 vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
813 sregs->u.s.ppc64.slb[i].slbe);
814 }
815 } else {
816 for (i = 0; i < 16; i++) {
817 vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
818 }
819 for (i = 0; i < 8; i++) {
820 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
821 (u32)sregs->u.s.ppc32.ibat[i]);
822 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
823 (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
824 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
825 (u32)sregs->u.s.ppc32.dbat[i]);
826 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
827 (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
828 }
829 }
830
831 /* Flush the MMU after messing with the segments */
832 kvmppc_mmu_pte_flush(vcpu, 0, 0);
833
834 return 0;
835 }
836
837 int kvmppc_core_check_processor_compat(void)
838 {
839 return 0;
840 }
841
842 struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
843 {
844 struct kvmppc_vcpu_book3s *vcpu_book3s;
845 struct kvm_vcpu *vcpu;
846 int err = -ENOMEM;
847 unsigned long p;
848
849 vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
850 if (!vcpu_book3s)
851 goto out;
852
853 vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
854 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
855 if (!vcpu_book3s->shadow_vcpu)
856 goto free_vcpu;
857
858 vcpu = &vcpu_book3s->vcpu;
859 err = kvm_vcpu_init(vcpu, kvm, id);
860 if (err)
861 goto free_shadow_vcpu;
862
863 p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
864 /* the real shared page fills the last 4k of our page */
865 vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
866 if (!p)
867 goto uninit_vcpu;
868
869 #ifdef CONFIG_PPC_BOOK3S_64
870 /* default to book3s_64 (970fx) */
871 vcpu->arch.pvr = 0x3C0301;
872 #else
873 /* default to book3s_32 (750) */
874 vcpu->arch.pvr = 0x84202;
875 #endif
876 kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
877 vcpu->arch.slb_nr = 64;
878
879 vcpu->arch.shadow_msr = MSR_USER64;
880
881 err = kvmppc_mmu_init(vcpu);
882 if (err < 0)
883 goto uninit_vcpu;
884
885 return vcpu;
886
887 uninit_vcpu:
888 kvm_vcpu_uninit(vcpu);
889 free_shadow_vcpu:
890 kfree(vcpu_book3s->shadow_vcpu);
891 free_vcpu:
892 vfree(vcpu_book3s);
893 out:
894 return ERR_PTR(err);
895 }
896
897 void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
898 {
899 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
900
901 free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
902 kvm_vcpu_uninit(vcpu);
903 kfree(vcpu_book3s->shadow_vcpu);
904 vfree(vcpu_book3s);
905 }
906
907 int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
908 {
909 int ret;
910 double fpr[32][TS_FPRWIDTH];
911 unsigned int fpscr;
912 int fpexc_mode;
913 #ifdef CONFIG_ALTIVEC
914 vector128 vr[32];
915 vector128 vscr;
916 unsigned long uninitialized_var(vrsave);
917 int used_vr;
918 #endif
919 #ifdef CONFIG_VSX
920 int used_vsr;
921 #endif
922 ulong ext_msr;
923
924 /* Check if we can run the vcpu at all */
925 if (!vcpu->arch.sane) {
926 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
927 return -EINVAL;
928 }
929
930 /* No need to go into the guest when all we do is going out */
931 if (signal_pending(current)) {
932 kvm_run->exit_reason = KVM_EXIT_INTR;
933 return -EINTR;
934 }
935
936 /* Save FPU state in stack */
937 if (current->thread.regs->msr & MSR_FP)
938 giveup_fpu(current);
939 memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
940 fpscr = current->thread.fpscr.val;
941 fpexc_mode = current->thread.fpexc_mode;
942
943 #ifdef CONFIG_ALTIVEC
944 /* Save Altivec state in stack */
945 used_vr = current->thread.used_vr;
946 if (used_vr) {
947 if (current->thread.regs->msr & MSR_VEC)
948 giveup_altivec(current);
949 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
950 vscr = current->thread.vscr;
951 vrsave = current->thread.vrsave;
952 }
953 #endif
954
955 #ifdef CONFIG_VSX
956 /* Save VSX state in stack */
957 used_vsr = current->thread.used_vsr;
958 if (used_vsr && (current->thread.regs->msr & MSR_VSX))
959 __giveup_vsx(current);
960 #endif
961
962 /* Remember the MSR with disabled extensions */
963 ext_msr = current->thread.regs->msr;
964
965 /* Preload FPU if it's enabled */
966 if (vcpu->arch.shared->msr & MSR_FP)
967 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
968
969 kvm_guest_enter();
970
971 ret = __kvmppc_vcpu_run(kvm_run, vcpu);
972
973 kvm_guest_exit();
974
975 local_irq_disable();
976
977 current->thread.regs->msr = ext_msr;
978
979 /* Make sure we save the guest FPU/Altivec/VSX state */
980 kvmppc_giveup_ext(vcpu, MSR_FP);
981 kvmppc_giveup_ext(vcpu, MSR_VEC);
982 kvmppc_giveup_ext(vcpu, MSR_VSX);
983
984 /* Restore FPU state from stack */
985 memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
986 current->thread.fpscr.val = fpscr;
987 current->thread.fpexc_mode = fpexc_mode;
988
989 #ifdef CONFIG_ALTIVEC
990 /* Restore Altivec state from stack */
991 if (used_vr && current->thread.used_vr) {
992 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
993 current->thread.vscr = vscr;
994 current->thread.vrsave = vrsave;
995 }
996 current->thread.used_vr = used_vr;
997 #endif
998
999 #ifdef CONFIG_VSX
1000 current->thread.used_vsr = used_vsr;
1001 #endif
1002
1003 return ret;
1004 }
1005
1006 int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1007 struct kvm_userspace_memory_region *mem)
1008 {
1009 return 0;
1010 }
1011
1012 void kvmppc_core_commit_memory_region(struct kvm *kvm,
1013 struct kvm_userspace_memory_region *mem)
1014 {
1015 }
1016
1017 int kvmppc_core_init_vm(struct kvm *kvm)
1018 {
1019 return 0;
1020 }
1021
1022 void kvmppc_core_destroy_vm(struct kvm *kvm)
1023 {
1024 }
1025
1026 static int kvmppc_book3s_init(void)
1027 {
1028 int r;
1029
1030 r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1031 THIS_MODULE);
1032
1033 if (r)
1034 return r;
1035
1036 r = kvmppc_mmu_hpte_sysinit();
1037
1038 return r;
1039 }
1040
1041 static void kvmppc_book3s_exit(void)
1042 {
1043 kvmppc_mmu_hpte_sysexit();
1044 kvm_exit();
1045 }
1046
1047 module_init(kvmppc_book3s_init);
1048 module_exit(kvmppc_book3s_exit);
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