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powerpc: add export.h to files making use of EXPORT_SYMBOL
[deliverable/linux.git] / arch / powerpc / kvm / book3s_pr.c
CommitLineData
f05ed4d5
PM		 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/err.h>
24#include <linux/slab.h>
25
26#include <asm/reg.h>
27#include <asm/cputable.h>
28#include <asm/cacheflush.h>
29#include <asm/tlbflush.h>
30#include <asm/uaccess.h>
31#include <asm/io.h>
32#include <asm/kvm_ppc.h>
33#include <asm/kvm_book3s.h>
34#include <asm/mmu_context.h>
35#include <linux/gfp.h>
36#include <linux/sched.h>
37#include <linux/vmalloc.h>
38#include <linux/highmem.h>
39
40#include "trace.h"
41
42/* #define EXIT_DEBUG */
43/* #define DEBUG_EXT */
44
45static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
46 ulong msr);
47
48/* Some compatibility defines */
49#ifdef CONFIG_PPC_BOOK3S_32
50#define MSR_USER32 MSR_USER
51#define MSR_USER64 MSR_USER
52#define HW_PAGE_SIZE PAGE_SIZE
53#endif
54
55void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
56{
57#ifdef CONFIG_PPC_BOOK3S_64
58 memcpy(to_svcpu(vcpu)->slb, to_book3s(vcpu)->slb_shadow, sizeof(to_svcpu(vcpu)->slb));
59 memcpy(&get_paca()->shadow_vcpu, to_book3s(vcpu)->shadow_vcpu,
60 sizeof(get_paca()->shadow_vcpu));
61 to_svcpu(vcpu)->slb_max = to_book3s(vcpu)->slb_shadow_max;
62#endif
63
64#ifdef CONFIG_PPC_BOOK3S_32
65 current->thread.kvm_shadow_vcpu = to_book3s(vcpu)->shadow_vcpu;
66#endif
67}
68
69void kvmppc_core_vcpu_put(struct kvm_vcpu *vcpu)
70{
71#ifdef CONFIG_PPC_BOOK3S_64
72 memcpy(to_book3s(vcpu)->slb_shadow, to_svcpu(vcpu)->slb, sizeof(to_svcpu(vcpu)->slb));
73 memcpy(to_book3s(vcpu)->shadow_vcpu, &get_paca()->shadow_vcpu,
74 sizeof(get_paca()->shadow_vcpu));
75 to_book3s(vcpu)->slb_shadow_max = to_svcpu(vcpu)->slb_max;
76#endif
77
78 kvmppc_giveup_ext(vcpu, MSR_FP);
79 kvmppc_giveup_ext(vcpu, MSR_VEC);
80 kvmppc_giveup_ext(vcpu, MSR_VSX);
81}
82
83static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
84{
85 ulong smsr = vcpu->arch.shared->msr;
86
87 /* Guest MSR values */
88 smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_DE;
89 /* Process MSR values */
90 smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
91 /* External providers the guest reserved */
92 smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
93 /* 64-bit Process MSR values */
94#ifdef CONFIG_PPC_BOOK3S_64
95 smsr |= MSR_ISF | MSR_HV;
96#endif
97 vcpu->arch.shadow_msr = smsr;
98}
99
100void kvmppc_set_msr(struct kvm_vcpu *vcpu, u64 msr)
101{
102 ulong old_msr = vcpu->arch.shared->msr;
103
104#ifdef EXIT_DEBUG
105 printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
106#endif
107
108 msr &= to_book3s(vcpu)->msr_mask;
109 vcpu->arch.shared->msr = msr;
110 kvmppc_recalc_shadow_msr(vcpu);
111
112 if (msr & MSR_POW) {
113 if (!vcpu->arch.pending_exceptions) {
114 kvm_vcpu_block(vcpu);
115 vcpu->stat.halt_wakeup++;
116
117 /* Unset POW bit after we woke up */
118 msr &= ~MSR_POW;
119 vcpu->arch.shared->msr = msr;
120 }
121 }
122
123 if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
124 (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
125 kvmppc_mmu_flush_segments(vcpu);
126 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
127
128 /* Preload magic page segment when in kernel mode */
129 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
130 struct kvm_vcpu_arch *a = &vcpu->arch;
131
132 if (msr & MSR_DR)
133 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
134 else
135 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
136 }
137 }
138
139 /* Preload FPU if it's enabled */
140 if (vcpu->arch.shared->msr & MSR_FP)
141 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
142}
143
144void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
145{
146 u32 host_pvr;
147
148 vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
149 vcpu->arch.pvr = pvr;
150#ifdef CONFIG_PPC_BOOK3S_64
151 if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
152 kvmppc_mmu_book3s_64_init(vcpu);
a15bd354
AG		 153 if (!to_book3s(vcpu)->hior_sregs)
154 to_book3s(vcpu)->hior = 0xfff00000;
f05ed4d5 155 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
af8f38b3 156 vcpu->arch.cpu_type = KVM_CPU_3S_64;
f05ed4d5
PM		 157 } else
158#endif
159 {
160 kvmppc_mmu_book3s_32_init(vcpu);
a15bd354
AG		 161 if (!to_book3s(vcpu)->hior_sregs)
162 to_book3s(vcpu)->hior = 0;
f05ed4d5 163 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
af8f38b3 164 vcpu->arch.cpu_type = KVM_CPU_3S_32;
f05ed4d5
PM		 165 }
166
af8f38b3
AG		 167 kvmppc_sanity_check(vcpu);
168
f05ed4d5
PM		 169 /* If we are in hypervisor level on 970, we can tell the CPU to
170 * treat DCBZ as 32 bytes store */
171 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
172 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
173 !strcmp(cur_cpu_spec->platform, "ppc970"))
174 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
175
176 /* Cell performs badly if MSR_FEx are set. So let's hope nobody
177 really needs them in a VM on Cell and force disable them. */
178 if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
179 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
180
181#ifdef CONFIG_PPC_BOOK3S_32
182 /* 32 bit Book3S always has 32 byte dcbz */
183 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
184#endif
185
186 /* On some CPUs we can execute paired single operations natively */
187 asm ( "mfpvr %0" : "=r"(host_pvr));
188 switch (host_pvr) {
189 case 0x00080200: /* lonestar 2.0 */
190 case 0x00088202: /* lonestar 2.2 */
191 case 0x70000100: /* gekko 1.0 */
192 case 0x00080100: /* gekko 2.0 */
193 case 0x00083203: /* gekko 2.3a */
194 case 0x00083213: /* gekko 2.3b */
195 case 0x00083204: /* gekko 2.4 */
196 case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */
197 case 0x00087200: /* broadway */
198 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
199 /* Enable HID2.PSE - in case we need it later */
200 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
201 }
202}
203
204/* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
205 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
206 * emulate 32 bytes dcbz length.
207 *
208 * The Book3s_64 inventors also realized this case and implemented a special bit
209 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
210 *
211 * My approach here is to patch the dcbz instruction on executing pages.
212 */
213static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
214{
215 struct page *hpage;
216 u64 hpage_offset;
217 u32 *page;
218 int i;
219
220 hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
221 if (is_error_page(hpage)) {
222 kvm_release_page_clean(hpage);
223 return;
224 }
225
226 hpage_offset = pte->raddr & ~PAGE_MASK;
227 hpage_offset &= ~0xFFFULL;
228 hpage_offset /= 4;
229
230 get_page(hpage);
231 page = kmap_atomic(hpage, KM_USER0);
232
233 /* patch dcbz into reserved instruction, so we trap */
234 for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
235 if ((page[i] & 0xff0007ff) == INS_DCBZ)
236 page[i] &= 0xfffffff7;
237
238 kunmap_atomic(page, KM_USER0);
239 put_page(hpage);
240}
241
242static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
243{
244 ulong mp_pa = vcpu->arch.magic_page_pa;
245
246 if (unlikely(mp_pa) &&
247 unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
248 return 1;
249 }
250
251 return kvm_is_visible_gfn(vcpu->kvm, gfn);
252}
253
254int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
255 ulong eaddr, int vec)
256{
257 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
258 int r = RESUME_GUEST;
259 int relocated;
260 int page_found = 0;
261 struct kvmppc_pte pte;
262 bool is_mmio = false;
263 bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
264 bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
265 u64 vsid;
266
267 relocated = data ? dr : ir;
268
269 /* Resolve real address if translation turned on */
270 if (relocated) {
271 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
272 } else {
273 pte.may_execute = true;
274 pte.may_read = true;
275 pte.may_write = true;
276 pte.raddr = eaddr & KVM_PAM;
277 pte.eaddr = eaddr;
278 pte.vpage = eaddr >> 12;
279 }
280
281 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
282 case 0:
283 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
284 break;
285 case MSR_DR:
286 case MSR_IR:
287 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
288
289 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
290 pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
291 else
292 pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
293 pte.vpage |= vsid;
294
295 if (vsid == -1)
296 page_found = -EINVAL;
297 break;
298 }
299
300 if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
301 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
302 /*
303 * If we do the dcbz hack, we have to NX on every execution,
304 * so we can patch the executing code. This renders our guest
305 * NX-less.
306 */
307 pte.may_execute = !data;
308 }
309
310 if (page_found == -ENOENT) {
311 /* Page not found in guest PTE entries */
312 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
313 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
314 vcpu->arch.shared->msr |=
315 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
316 kvmppc_book3s_queue_irqprio(vcpu, vec);
317 } else if (page_found == -EPERM) {
318 /* Storage protection */
319 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
320 vcpu->arch.shared->dsisr =
321 to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE;
322 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
323 vcpu->arch.shared->msr |=
324 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
325 kvmppc_book3s_queue_irqprio(vcpu, vec);
326 } else if (page_found == -EINVAL) {
327 /* Page not found in guest SLB */
328 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
329 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
330 } else if (!is_mmio &&
331 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
332 /* The guest's PTE is not mapped yet. Map on the host */
333 kvmppc_mmu_map_page(vcpu, &pte);
334 if (data)
335 vcpu->stat.sp_storage++;
336 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
337 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
338 kvmppc_patch_dcbz(vcpu, &pte);
339 } else {
340 /* MMIO */
341 vcpu->stat.mmio_exits++;
342 vcpu->arch.paddr_accessed = pte.raddr;
343 r = kvmppc_emulate_mmio(run, vcpu);
344 if ( r == RESUME_HOST_NV )
345 r = RESUME_HOST;
346 }
347
348 return r;
349}
350
351static inline int get_fpr_index(int i)
352{
353#ifdef CONFIG_VSX
354 i *= 2;
355#endif
356 return i;
357}
358
359/* Give up external provider (FPU, Altivec, VSX) */
360void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
361{
362 struct thread_struct *t = &current->thread;
363 u64 *vcpu_fpr = vcpu->arch.fpr;
364#ifdef CONFIG_VSX
365 u64 *vcpu_vsx = vcpu->arch.vsr;
366#endif
367 u64 *thread_fpr = (u64*)t->fpr;
368 int i;
369
370 if (!(vcpu->arch.guest_owned_ext & msr))
371 return;
372
373#ifdef DEBUG_EXT
374 printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
375#endif
376
377 switch (msr) {
378 case MSR_FP:
379 giveup_fpu(current);
380 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
381 vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
382
383 vcpu->arch.fpscr = t->fpscr.val;
384 break;
385 case MSR_VEC:
386#ifdef CONFIG_ALTIVEC
387 giveup_altivec(current);
388 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
389 vcpu->arch.vscr = t->vscr;
390#endif
391 break;
392 case MSR_VSX:
393#ifdef CONFIG_VSX
394 __giveup_vsx(current);
395 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
396 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
397#endif
398 break;
399 default:
400 BUG();
401 }
402
403 vcpu->arch.guest_owned_ext &= ~msr;
404 current->thread.regs->msr &= ~msr;
405 kvmppc_recalc_shadow_msr(vcpu);
406}
407
408static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
409{
410 ulong srr0 = kvmppc_get_pc(vcpu);
411 u32 last_inst = kvmppc_get_last_inst(vcpu);
412 int ret;
413
414 ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
415 if (ret == -ENOENT) {
416 ulong msr = vcpu->arch.shared->msr;
417
418 msr = kvmppc_set_field(msr, 33, 33, 1);
419 msr = kvmppc_set_field(msr, 34, 36, 0);
420 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
421 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
422 return EMULATE_AGAIN;
423 }
424
425 return EMULATE_DONE;
426}
427
428static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
429{
430
431 /* Need to do paired single emulation? */
432 if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
433 return EMULATE_DONE;
434
435 /* Read out the instruction */
436 if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
437 /* Need to emulate */
438 return EMULATE_FAIL;
439
440 return EMULATE_AGAIN;
441}
442
443/* Handle external providers (FPU, Altivec, VSX) */
444static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
445 ulong msr)
446{
447 struct thread_struct *t = &current->thread;
448 u64 *vcpu_fpr = vcpu->arch.fpr;
449#ifdef CONFIG_VSX
450 u64 *vcpu_vsx = vcpu->arch.vsr;
451#endif
452 u64 *thread_fpr = (u64*)t->fpr;
453 int i;
454
455 /* When we have paired singles, we emulate in software */
456 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
457 return RESUME_GUEST;
458
459 if (!(vcpu->arch.shared->msr & msr)) {
460 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
461 return RESUME_GUEST;
462 }
463
464 /* We already own the ext */
465 if (vcpu->arch.guest_owned_ext & msr) {
466 return RESUME_GUEST;
467 }
468
469#ifdef DEBUG_EXT
470 printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
471#endif
472
473 current->thread.regs->msr |= msr;
474
475 switch (msr) {
476 case MSR_FP:
477 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
478 thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
479
480 t->fpscr.val = vcpu->arch.fpscr;
481 t->fpexc_mode = 0;
482 kvmppc_load_up_fpu();
483 break;
484 case MSR_VEC:
485#ifdef CONFIG_ALTIVEC
486 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
487 t->vscr = vcpu->arch.vscr;
488 t->vrsave = -1;
489 kvmppc_load_up_altivec();
490#endif
491 break;
492 case MSR_VSX:
493#ifdef CONFIG_VSX
494 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
495 thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
496 kvmppc_load_up_vsx();
497#endif
498 break;
499 default:
500 BUG();
501 }
502
503 vcpu->arch.guest_owned_ext |= msr;
504
505 kvmppc_recalc_shadow_msr(vcpu);
506
507 return RESUME_GUEST;
508}
509
510int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
511 unsigned int exit_nr)
512{
513 int r = RESUME_HOST;
514
515 vcpu->stat.sum_exits++;
516
517 run->exit_reason = KVM_EXIT_UNKNOWN;
518 run->ready_for_interrupt_injection = 1;
519
520 trace_kvm_book3s_exit(exit_nr, vcpu);
521 kvm_resched(vcpu);
522 switch (exit_nr) {
523 case BOOK3S_INTERRUPT_INST_STORAGE:
524 vcpu->stat.pf_instruc++;
525
526#ifdef CONFIG_PPC_BOOK3S_32
527 /* We set segments as unused segments when invalidating them. So
528 * treat the respective fault as segment fault. */
529 if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT]
530 == SR_INVALID) {
531 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
532 r = RESUME_GUEST;
533 break;
534 }
535#endif
536
537 /* only care about PTEG not found errors, but leave NX alone */
538 if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) {
539 r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
540 vcpu->stat.sp_instruc++;
541 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
542 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
543 /*
544 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
545 * so we can't use the NX bit inside the guest. Let's cross our fingers,
546 * that no guest that needs the dcbz hack does NX.
547 */
548 kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
549 r = RESUME_GUEST;
550 } else {
551 vcpu->arch.shared->msr |=
552 to_svcpu(vcpu)->shadow_srr1 & 0x58000000;
553 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
554 r = RESUME_GUEST;
555 }
556 break;
557 case BOOK3S_INTERRUPT_DATA_STORAGE:
558 {
559 ulong dar = kvmppc_get_fault_dar(vcpu);
560 vcpu->stat.pf_storage++;
561
562#ifdef CONFIG_PPC_BOOK3S_32
563 /* We set segments as unused segments when invalidating them. So
564 * treat the respective fault as segment fault. */
565 if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) {
566 kvmppc_mmu_map_segment(vcpu, dar);
567 r = RESUME_GUEST;
568 break;
569 }
570#endif
571
572 /* The only case we need to handle is missing shadow PTEs */
573 if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) {
574 r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
575 } else {
576 vcpu->arch.shared->dar = dar;
577 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
578 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
579 r = RESUME_GUEST;
580 }
581 break;
582 }
583 case BOOK3S_INTERRUPT_DATA_SEGMENT:
584 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
585 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
586 kvmppc_book3s_queue_irqprio(vcpu,
587 BOOK3S_INTERRUPT_DATA_SEGMENT);
588 }
589 r = RESUME_GUEST;
590 break;
591 case BOOK3S_INTERRUPT_INST_SEGMENT:
592 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
593 kvmppc_book3s_queue_irqprio(vcpu,
594 BOOK3S_INTERRUPT_INST_SEGMENT);
595 }
596 r = RESUME_GUEST;
597 break;
598 /* We're good on these - the host merely wanted to get our attention */
599 case BOOK3S_INTERRUPT_DECREMENTER:
600 vcpu->stat.dec_exits++;
601 r = RESUME_GUEST;
602 break;
603 case BOOK3S_INTERRUPT_EXTERNAL:
604 vcpu->stat.ext_intr_exits++;
605 r = RESUME_GUEST;
606 break;
607 case BOOK3S_INTERRUPT_PERFMON:
608 r = RESUME_GUEST;
609 break;
610 case BOOK3S_INTERRUPT_PROGRAM:
611 {
612 enum emulation_result er;
613 ulong flags;
614
615program_interrupt:
616 flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull;
617
618 if (vcpu->arch.shared->msr & MSR_PR) {
619#ifdef EXIT_DEBUG
620 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
621#endif
622 if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
623 (INS_DCBZ & 0xfffffff7)) {
624 kvmppc_core_queue_program(vcpu, flags);
625 r = RESUME_GUEST;
626 break;
627 }
628 }
629
630 vcpu->stat.emulated_inst_exits++;
631 er = kvmppc_emulate_instruction(run, vcpu);
632 switch (er) {
633 case EMULATE_DONE:
634 r = RESUME_GUEST_NV;
635 break;
636 case EMULATE_AGAIN:
637 r = RESUME_GUEST;
638 break;
639 case EMULATE_FAIL:
640 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
641 __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
642 kvmppc_core_queue_program(vcpu, flags);
643 r = RESUME_GUEST;
644 break;
645 case EMULATE_DO_MMIO:
646 run->exit_reason = KVM_EXIT_MMIO;
647 r = RESUME_HOST_NV;
648 break;
649 default:
650 BUG();
651 }
652 break;
653 }
654 case BOOK3S_INTERRUPT_SYSCALL:
a668f2bd
AG		 655 if (vcpu->arch.papr_enabled &&
656 (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
657 !(vcpu->arch.shared->msr & MSR_PR)) {
658 /* SC 1 papr hypercalls */
659 ulong cmd = kvmppc_get_gpr(vcpu, 3);
660 int i;
661
662 if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
663 r = RESUME_GUEST;
664 break;
665 }
666
667 run->papr_hcall.nr = cmd;
668 for (i = 0; i < 9; ++i) {
669 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
670 run->papr_hcall.args[i] = gpr;
671 }
672 run->exit_reason = KVM_EXIT_PAPR_HCALL;
673 vcpu->arch.hcall_needed = 1;
674 r = RESUME_HOST;
675 } else if (vcpu->arch.osi_enabled &&
f05ed4d5
PM		 676 (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
677 (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
678 /* MOL hypercalls */
679 u64 *gprs = run->osi.gprs;
680 int i;
681
682 run->exit_reason = KVM_EXIT_OSI;
683 for (i = 0; i < 32; i++)
684 gprs[i] = kvmppc_get_gpr(vcpu, i);
685 vcpu->arch.osi_needed = 1;
686 r = RESUME_HOST_NV;
687 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
688 (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
689 /* KVM PV hypercalls */
690 kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
691 r = RESUME_GUEST;
692 } else {
693 /* Guest syscalls */
694 vcpu->stat.syscall_exits++;
695 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
696 r = RESUME_GUEST;
697 }
698 break;
699 case BOOK3S_INTERRUPT_FP_UNAVAIL:
700 case BOOK3S_INTERRUPT_ALTIVEC:
701 case BOOK3S_INTERRUPT_VSX:
702 {
703 int ext_msr = 0;
704
705 switch (exit_nr) {
706 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break;
707 case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break;
708 case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break;
709 }
710
711 switch (kvmppc_check_ext(vcpu, exit_nr)) {
712 case EMULATE_DONE:
713 /* everything ok - let's enable the ext */
714 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
715 break;
716 case EMULATE_FAIL:
717 /* we need to emulate this instruction */
718 goto program_interrupt;
719 break;
720 default:
721 /* nothing to worry about - go again */
722 break;
723 }
724 break;
725 }
726 case BOOK3S_INTERRUPT_ALIGNMENT:
727 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
728 vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
729 kvmppc_get_last_inst(vcpu));
730 vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
731 kvmppc_get_last_inst(vcpu));
732 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
733 }
734 r = RESUME_GUEST;
735 break;
736 case BOOK3S_INTERRUPT_MACHINE_CHECK:
737 case BOOK3S_INTERRUPT_TRACE:
738 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
739 r = RESUME_GUEST;
740 break;
741 default:
742 /* Ugh - bork here! What did we get? */
743 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
744 exit_nr, kvmppc_get_pc(vcpu), to_svcpu(vcpu)->shadow_srr1);
745 r = RESUME_HOST;
746 BUG();
747 break;
748 }
749
750
751 if (!(r & RESUME_HOST)) {
752 /* To avoid clobbering exit_reason, only check for signals if
753 * we aren't already exiting to userspace for some other
754 * reason. */
755 if (signal_pending(current)) {
756#ifdef EXIT_DEBUG
757 printk(KERN_EMERG "KVM: Going back to host\n");
758#endif
759 vcpu->stat.signal_exits++;
760 run->exit_reason = KVM_EXIT_INTR;
761 r = -EINTR;
762 } else {
763 /* In case an interrupt came in that was triggered
764 * from userspace (like DEC), we need to check what
765 * to inject now! */
766 kvmppc_core_deliver_interrupts(vcpu);
767 }
768 }
769
770 trace_kvm_book3s_reenter(r, vcpu);
771
772 return r;
773}
774
775int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
776 struct kvm_sregs *sregs)
777{
778 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
779 int i;
780
781 sregs->pvr = vcpu->arch.pvr;
782
783 sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
784 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
785 for (i = 0; i < 64; i++) {
786 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
787 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
788 }
789 } else {
790 for (i = 0; i < 16; i++)
791 sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
792
793 for (i = 0; i < 8; i++) {
794 sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
795 sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
796 }
797 }
798
a15bd354
AG		 799 if (sregs->u.s.flags & KVM_SREGS_S_HIOR)
800 sregs->u.s.hior = to_book3s(vcpu)->hior;
801
f05ed4d5
PM		 802 return 0;
803}
804
805int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
806 struct kvm_sregs *sregs)
807{
808 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
809 int i;
810
811 kvmppc_set_pvr(vcpu, sregs->pvr);
812
813 vcpu3s->sdr1 = sregs->u.s.sdr1;
814 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
815 for (i = 0; i < 64; i++) {
816 vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
817 sregs->u.s.ppc64.slb[i].slbe);
818 }
819 } else {
820 for (i = 0; i < 16; i++) {
821 vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
822 }
823 for (i = 0; i < 8; i++) {
824 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
825 (u32)sregs->u.s.ppc32.ibat[i]);
826 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
827 (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
828 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
829 (u32)sregs->u.s.ppc32.dbat[i]);
830 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
831 (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
832 }
833 }
834
835 /* Flush the MMU after messing with the segments */
836 kvmppc_mmu_pte_flush(vcpu, 0, 0);
837
a15bd354
AG		 838 if (sregs->u.s.flags & KVM_SREGS_S_HIOR) {
839 to_book3s(vcpu)->hior_sregs = true;
840 to_book3s(vcpu)->hior = sregs->u.s.hior;
841 }
842
f05ed4d5
PM		 843 return 0;
844}
845
846int kvmppc_core_check_processor_compat(void)
847{
848 return 0;
849}
850
851struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
852{
853 struct kvmppc_vcpu_book3s *vcpu_book3s;
854 struct kvm_vcpu *vcpu;
855 int err = -ENOMEM;
856 unsigned long p;
857
858 vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
859 if (!vcpu_book3s)
860 goto out;
861
862 vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
863 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
864 if (!vcpu_book3s->shadow_vcpu)
865 goto free_vcpu;
866
867 vcpu = &vcpu_book3s->vcpu;
868 err = kvm_vcpu_init(vcpu, kvm, id);
869 if (err)
870 goto free_shadow_vcpu;
871
872 p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
873 /* the real shared page fills the last 4k of our page */
874 vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
875 if (!p)
876 goto uninit_vcpu;
877
f05ed4d5
PM		 878#ifdef CONFIG_PPC_BOOK3S_64
879 /* default to book3s_64 (970fx) */
880 vcpu->arch.pvr = 0x3C0301;
881#else
882 /* default to book3s_32 (750) */
883 vcpu->arch.pvr = 0x84202;
884#endif
885 kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
886 vcpu->arch.slb_nr = 64;
887
f05ed4d5
PM		 888 vcpu->arch.shadow_msr = MSR_USER64;
889
890 err = kvmppc_mmu_init(vcpu);
891 if (err < 0)
892 goto uninit_vcpu;
893
894 return vcpu;
895
896uninit_vcpu:
897 kvm_vcpu_uninit(vcpu);
898free_shadow_vcpu:
899 kfree(vcpu_book3s->shadow_vcpu);
900free_vcpu:
901 vfree(vcpu_book3s);
902out:
903 return ERR_PTR(err);
904}
905
906void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
907{
908 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
909
910 free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
911 kvm_vcpu_uninit(vcpu);
912 kfree(vcpu_book3s->shadow_vcpu);
913 vfree(vcpu_book3s);
914}
915
df6909e5 916int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
f05ed4d5
PM		 917{
918 int ret;
919 double fpr[32][TS_FPRWIDTH];
920 unsigned int fpscr;
921 int fpexc_mode;
922#ifdef CONFIG_ALTIVEC
923 vector128 vr[32];
924 vector128 vscr;
925 unsigned long uninitialized_var(vrsave);
926 int used_vr;
927#endif
928#ifdef CONFIG_VSX
929 int used_vsr;
930#endif
931 ulong ext_msr;
932
af8f38b3
AG		 933 /* Check if we can run the vcpu at all */
934 if (!vcpu->arch.sane) {
935 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
936 return -EINVAL;
937 }
938
f05ed4d5
PM		 939 /* No need to go into the guest when all we do is going out */
940 if (signal_pending(current)) {
941 kvm_run->exit_reason = KVM_EXIT_INTR;
942 return -EINTR;
943 }
944
945 /* Save FPU state in stack */
946 if (current->thread.regs->msr & MSR_FP)
947 giveup_fpu(current);
948 memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
949 fpscr = current->thread.fpscr.val;
950 fpexc_mode = current->thread.fpexc_mode;
951
952#ifdef CONFIG_ALTIVEC
953 /* Save Altivec state in stack */
954 used_vr = current->thread.used_vr;
955 if (used_vr) {
956 if (current->thread.regs->msr & MSR_VEC)
957 giveup_altivec(current);
958 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
959 vscr = current->thread.vscr;
960 vrsave = current->thread.vrsave;
961 }
962#endif
963
964#ifdef CONFIG_VSX
965 /* Save VSX state in stack */
966 used_vsr = current->thread.used_vsr;
967 if (used_vsr && (current->thread.regs->msr & MSR_VSX))
968 __giveup_vsx(current);
969#endif
970
971 /* Remember the MSR with disabled extensions */
972 ext_msr = current->thread.regs->msr;
973
f05ed4d5
PM		 974 /* Preload FPU if it's enabled */
975 if (vcpu->arch.shared->msr & MSR_FP)
976 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
977
df6909e5
PM		 978 kvm_guest_enter();
979
980 ret = __kvmppc_vcpu_run(kvm_run, vcpu);
981
982 kvm_guest_exit();
f05ed4d5
PM		 983
984 local_irq_disable();
985
986 current->thread.regs->msr = ext_msr;
987
988 /* Make sure we save the guest FPU/Altivec/VSX state */
989 kvmppc_giveup_ext(vcpu, MSR_FP);
990 kvmppc_giveup_ext(vcpu, MSR_VEC);
991 kvmppc_giveup_ext(vcpu, MSR_VSX);
992
993 /* Restore FPU state from stack */
994 memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
995 current->thread.fpscr.val = fpscr;
996 current->thread.fpexc_mode = fpexc_mode;
997
998#ifdef CONFIG_ALTIVEC
999 /* Restore Altivec state from stack */
1000 if (used_vr && current->thread.used_vr) {
1001 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1002 current->thread.vscr = vscr;
1003 current->thread.vrsave = vrsave;
1004 }
1005 current->thread.used_vr = used_vr;
1006#endif
1007
1008#ifdef CONFIG_VSX
1009 current->thread.used_vsr = used_vsr;
1010#endif
1011
1012 return ret;
1013}
1014
f9e0554d
PM		 1015int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1016 struct kvm_userspace_memory_region *mem)
1017{
1018 return 0;
1019}
1020
1021void kvmppc_core_commit_memory_region(struct kvm *kvm,
1022 struct kvm_userspace_memory_region *mem)
1023{
1024}
1025
1026int kvmppc_core_init_vm(struct kvm *kvm)
1027{
1028 return 0;
1029}
1030
1031void kvmppc_core_destroy_vm(struct kvm *kvm)
1032{
1033}
1034
f05ed4d5
PM		 1035static int kvmppc_book3s_init(void)
1036{
1037 int r;
1038
1039 r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1040 THIS_MODULE);
1041
1042 if (r)
1043 return r;
1044
1045 r = kvmppc_mmu_hpte_sysinit();
1046
1047 return r;
1048}
1049
1050static void kvmppc_book3s_exit(void)
1051{
1052 kvmppc_mmu_hpte_sysexit();
1053 kvm_exit();
1054}
1055
1056module_init(kvmppc_book3s_init);
1057module_exit(kvmppc_book3s_exit);
Linux kernel - Deliverables
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