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KVM: PPC: Enable the PAPR CAP for Book3S
[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
PM		 155 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
156 } else
157#endif
158 {
159 kvmppc_mmu_book3s_32_init(vcpu);
a15bd354
AG		 160 if (!to_book3s(vcpu)->hior_sregs)
161 to_book3s(vcpu)->hior = 0;
f05ed4d5
PM		 162 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
163 }
164
165 /* If we are in hypervisor level on 970, we can tell the CPU to
166 * treat DCBZ as 32 bytes store */
167 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
168 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
169 !strcmp(cur_cpu_spec->platform, "ppc970"))
170 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
171
172 /* Cell performs badly if MSR_FEx are set. So let's hope nobody
173 really needs them in a VM on Cell and force disable them. */
174 if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
175 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
176
177#ifdef CONFIG_PPC_BOOK3S_32
178 /* 32 bit Book3S always has 32 byte dcbz */
179 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
180#endif
181
182 /* On some CPUs we can execute paired single operations natively */
183 asm ( "mfpvr %0" : "=r"(host_pvr));
184 switch (host_pvr) {
185 case 0x00080200: /* lonestar 2.0 */
186 case 0x00088202: /* lonestar 2.2 */
187 case 0x70000100: /* gekko 1.0 */
188 case 0x00080100: /* gekko 2.0 */
189 case 0x00083203: /* gekko 2.3a */
190 case 0x00083213: /* gekko 2.3b */
191 case 0x00083204: /* gekko 2.4 */
192 case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */
193 case 0x00087200: /* broadway */
194 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
195 /* Enable HID2.PSE - in case we need it later */
196 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
197 }
198}
199
200/* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
201 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
202 * emulate 32 bytes dcbz length.
203 *
204 * The Book3s_64 inventors also realized this case and implemented a special bit
205 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
206 *
207 * My approach here is to patch the dcbz instruction on executing pages.
208 */
209static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
210{
211 struct page *hpage;
212 u64 hpage_offset;
213 u32 *page;
214 int i;
215
216 hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
217 if (is_error_page(hpage)) {
218 kvm_release_page_clean(hpage);
219 return;
220 }
221
222 hpage_offset = pte->raddr & ~PAGE_MASK;
223 hpage_offset &= ~0xFFFULL;
224 hpage_offset /= 4;
225
226 get_page(hpage);
227 page = kmap_atomic(hpage, KM_USER0);
228
229 /* patch dcbz into reserved instruction, so we trap */
230 for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
231 if ((page[i] & 0xff0007ff) == INS_DCBZ)
232 page[i] &= 0xfffffff7;
233
234 kunmap_atomic(page, KM_USER0);
235 put_page(hpage);
236}
237
238static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
239{
240 ulong mp_pa = vcpu->arch.magic_page_pa;
241
242 if (unlikely(mp_pa) &&
243 unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
244 return 1;
245 }
246
247 return kvm_is_visible_gfn(vcpu->kvm, gfn);
248}
249
250int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
251 ulong eaddr, int vec)
252{
253 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
254 int r = RESUME_GUEST;
255 int relocated;
256 int page_found = 0;
257 struct kvmppc_pte pte;
258 bool is_mmio = false;
259 bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
260 bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
261 u64 vsid;
262
263 relocated = data ? dr : ir;
264
265 /* Resolve real address if translation turned on */
266 if (relocated) {
267 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data);
268 } else {
269 pte.may_execute = true;
270 pte.may_read = true;
271 pte.may_write = true;
272 pte.raddr = eaddr & KVM_PAM;
273 pte.eaddr = eaddr;
274 pte.vpage = eaddr >> 12;
275 }
276
277 switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
278 case 0:
279 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
280 break;
281 case MSR_DR:
282 case MSR_IR:
283 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
284
285 if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
286 pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
287 else
288 pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
289 pte.vpage |= vsid;
290
291 if (vsid == -1)
292 page_found = -EINVAL;
293 break;
294 }
295
296 if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
297 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
298 /*
299 * If we do the dcbz hack, we have to NX on every execution,
300 * so we can patch the executing code. This renders our guest
301 * NX-less.
302 */
303 pte.may_execute = !data;
304 }
305
306 if (page_found == -ENOENT) {
307 /* Page not found in guest PTE entries */
308 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
309 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
310 vcpu->arch.shared->msr |=
311 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
312 kvmppc_book3s_queue_irqprio(vcpu, vec);
313 } else if (page_found == -EPERM) {
314 /* Storage protection */
315 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
316 vcpu->arch.shared->dsisr =
317 to_svcpu(vcpu)->fault_dsisr & ~DSISR_NOHPTE;
318 vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
319 vcpu->arch.shared->msr |=
320 (to_svcpu(vcpu)->shadow_srr1 & 0x00000000f8000000ULL);
321 kvmppc_book3s_queue_irqprio(vcpu, vec);
322 } else if (page_found == -EINVAL) {
323 /* Page not found in guest SLB */
324 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
325 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
326 } else if (!is_mmio &&
327 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
328 /* The guest's PTE is not mapped yet. Map on the host */
329 kvmppc_mmu_map_page(vcpu, &pte);
330 if (data)
331 vcpu->stat.sp_storage++;
332 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
333 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
334 kvmppc_patch_dcbz(vcpu, &pte);
335 } else {
336 /* MMIO */
337 vcpu->stat.mmio_exits++;
338 vcpu->arch.paddr_accessed = pte.raddr;
339 r = kvmppc_emulate_mmio(run, vcpu);
340 if ( r == RESUME_HOST_NV )
341 r = RESUME_HOST;
342 }
343
344 return r;
345}
346
347static inline int get_fpr_index(int i)
348{
349#ifdef CONFIG_VSX
350 i *= 2;
351#endif
352 return i;
353}
354
355/* Give up external provider (FPU, Altivec, VSX) */
356void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
357{
358 struct thread_struct *t = &current->thread;
359 u64 *vcpu_fpr = vcpu->arch.fpr;
360#ifdef CONFIG_VSX
361 u64 *vcpu_vsx = vcpu->arch.vsr;
362#endif
363 u64 *thread_fpr = (u64*)t->fpr;
364 int i;
365
366 if (!(vcpu->arch.guest_owned_ext & msr))
367 return;
368
369#ifdef DEBUG_EXT
370 printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
371#endif
372
373 switch (msr) {
374 case MSR_FP:
375 giveup_fpu(current);
376 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
377 vcpu_fpr[i] = thread_fpr[get_fpr_index(i)];
378
379 vcpu->arch.fpscr = t->fpscr.val;
380 break;
381 case MSR_VEC:
382#ifdef CONFIG_ALTIVEC
383 giveup_altivec(current);
384 memcpy(vcpu->arch.vr, t->vr, sizeof(vcpu->arch.vr));
385 vcpu->arch.vscr = t->vscr;
386#endif
387 break;
388 case MSR_VSX:
389#ifdef CONFIG_VSX
390 __giveup_vsx(current);
391 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
392 vcpu_vsx[i] = thread_fpr[get_fpr_index(i) + 1];
393#endif
394 break;
395 default:
396 BUG();
397 }
398
399 vcpu->arch.guest_owned_ext &= ~msr;
400 current->thread.regs->msr &= ~msr;
401 kvmppc_recalc_shadow_msr(vcpu);
402}
403
404static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
405{
406 ulong srr0 = kvmppc_get_pc(vcpu);
407 u32 last_inst = kvmppc_get_last_inst(vcpu);
408 int ret;
409
410 ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
411 if (ret == -ENOENT) {
412 ulong msr = vcpu->arch.shared->msr;
413
414 msr = kvmppc_set_field(msr, 33, 33, 1);
415 msr = kvmppc_set_field(msr, 34, 36, 0);
416 vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
417 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
418 return EMULATE_AGAIN;
419 }
420
421 return EMULATE_DONE;
422}
423
424static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
425{
426
427 /* Need to do paired single emulation? */
428 if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
429 return EMULATE_DONE;
430
431 /* Read out the instruction */
432 if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
433 /* Need to emulate */
434 return EMULATE_FAIL;
435
436 return EMULATE_AGAIN;
437}
438
439/* Handle external providers (FPU, Altivec, VSX) */
440static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
441 ulong msr)
442{
443 struct thread_struct *t = &current->thread;
444 u64 *vcpu_fpr = vcpu->arch.fpr;
445#ifdef CONFIG_VSX
446 u64 *vcpu_vsx = vcpu->arch.vsr;
447#endif
448 u64 *thread_fpr = (u64*)t->fpr;
449 int i;
450
451 /* When we have paired singles, we emulate in software */
452 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
453 return RESUME_GUEST;
454
455 if (!(vcpu->arch.shared->msr & msr)) {
456 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
457 return RESUME_GUEST;
458 }
459
460 /* We already own the ext */
461 if (vcpu->arch.guest_owned_ext & msr) {
462 return RESUME_GUEST;
463 }
464
465#ifdef DEBUG_EXT
466 printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
467#endif
468
469 current->thread.regs->msr |= msr;
470
471 switch (msr) {
472 case MSR_FP:
473 for (i = 0; i < ARRAY_SIZE(vcpu->arch.fpr); i++)
474 thread_fpr[get_fpr_index(i)] = vcpu_fpr[i];
475
476 t->fpscr.val = vcpu->arch.fpscr;
477 t->fpexc_mode = 0;
478 kvmppc_load_up_fpu();
479 break;
480 case MSR_VEC:
481#ifdef CONFIG_ALTIVEC
482 memcpy(t->vr, vcpu->arch.vr, sizeof(vcpu->arch.vr));
483 t->vscr = vcpu->arch.vscr;
484 t->vrsave = -1;
485 kvmppc_load_up_altivec();
486#endif
487 break;
488 case MSR_VSX:
489#ifdef CONFIG_VSX
490 for (i = 0; i < ARRAY_SIZE(vcpu->arch.vsr); i++)
491 thread_fpr[get_fpr_index(i) + 1] = vcpu_vsx[i];
492 kvmppc_load_up_vsx();
493#endif
494 break;
495 default:
496 BUG();
497 }
498
499 vcpu->arch.guest_owned_ext |= msr;
500
501 kvmppc_recalc_shadow_msr(vcpu);
502
503 return RESUME_GUEST;
504}
505
506int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
507 unsigned int exit_nr)
508{
509 int r = RESUME_HOST;
510
511 vcpu->stat.sum_exits++;
512
513 run->exit_reason = KVM_EXIT_UNKNOWN;
514 run->ready_for_interrupt_injection = 1;
515
516 trace_kvm_book3s_exit(exit_nr, vcpu);
517 kvm_resched(vcpu);
518 switch (exit_nr) {
519 case BOOK3S_INTERRUPT_INST_STORAGE:
520 vcpu->stat.pf_instruc++;
521
522#ifdef CONFIG_PPC_BOOK3S_32
523 /* We set segments as unused segments when invalidating them. So
524 * treat the respective fault as segment fault. */
525 if (to_svcpu(vcpu)->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT]
526 == SR_INVALID) {
527 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
528 r = RESUME_GUEST;
529 break;
530 }
531#endif
532
533 /* only care about PTEG not found errors, but leave NX alone */
534 if (to_svcpu(vcpu)->shadow_srr1 & 0x40000000) {
535 r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
536 vcpu->stat.sp_instruc++;
537 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
538 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
539 /*
540 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
541 * so we can't use the NX bit inside the guest. Let's cross our fingers,
542 * that no guest that needs the dcbz hack does NX.
543 */
544 kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
545 r = RESUME_GUEST;
546 } else {
547 vcpu->arch.shared->msr |=
548 to_svcpu(vcpu)->shadow_srr1 & 0x58000000;
549 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
550 r = RESUME_GUEST;
551 }
552 break;
553 case BOOK3S_INTERRUPT_DATA_STORAGE:
554 {
555 ulong dar = kvmppc_get_fault_dar(vcpu);
556 vcpu->stat.pf_storage++;
557
558#ifdef CONFIG_PPC_BOOK3S_32
559 /* We set segments as unused segments when invalidating them. So
560 * treat the respective fault as segment fault. */
561 if ((to_svcpu(vcpu)->sr[dar >> SID_SHIFT]) == SR_INVALID) {
562 kvmppc_mmu_map_segment(vcpu, dar);
563 r = RESUME_GUEST;
564 break;
565 }
566#endif
567
568 /* The only case we need to handle is missing shadow PTEs */
569 if (to_svcpu(vcpu)->fault_dsisr & DSISR_NOHPTE) {
570 r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
571 } else {
572 vcpu->arch.shared->dar = dar;
573 vcpu->arch.shared->dsisr = to_svcpu(vcpu)->fault_dsisr;
574 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
575 r = RESUME_GUEST;
576 }
577 break;
578 }
579 case BOOK3S_INTERRUPT_DATA_SEGMENT:
580 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
581 vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
582 kvmppc_book3s_queue_irqprio(vcpu,
583 BOOK3S_INTERRUPT_DATA_SEGMENT);
584 }
585 r = RESUME_GUEST;
586 break;
587 case BOOK3S_INTERRUPT_INST_SEGMENT:
588 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
589 kvmppc_book3s_queue_irqprio(vcpu,
590 BOOK3S_INTERRUPT_INST_SEGMENT);
591 }
592 r = RESUME_GUEST;
593 break;
594 /* We're good on these - the host merely wanted to get our attention */
595 case BOOK3S_INTERRUPT_DECREMENTER:
596 vcpu->stat.dec_exits++;
597 r = RESUME_GUEST;
598 break;
599 case BOOK3S_INTERRUPT_EXTERNAL:
600 vcpu->stat.ext_intr_exits++;
601 r = RESUME_GUEST;
602 break;
603 case BOOK3S_INTERRUPT_PERFMON:
604 r = RESUME_GUEST;
605 break;
606 case BOOK3S_INTERRUPT_PROGRAM:
607 {
608 enum emulation_result er;
609 ulong flags;
610
611program_interrupt:
612 flags = to_svcpu(vcpu)->shadow_srr1 & 0x1f0000ull;
613
614 if (vcpu->arch.shared->msr & MSR_PR) {
615#ifdef EXIT_DEBUG
616 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
617#endif
618 if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
619 (INS_DCBZ & 0xfffffff7)) {
620 kvmppc_core_queue_program(vcpu, flags);
621 r = RESUME_GUEST;
622 break;
623 }
624 }
625
626 vcpu->stat.emulated_inst_exits++;
627 er = kvmppc_emulate_instruction(run, vcpu);
628 switch (er) {
629 case EMULATE_DONE:
630 r = RESUME_GUEST_NV;
631 break;
632 case EMULATE_AGAIN:
633 r = RESUME_GUEST;
634 break;
635 case EMULATE_FAIL:
636 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
637 __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
638 kvmppc_core_queue_program(vcpu, flags);
639 r = RESUME_GUEST;
640 break;
641 case EMULATE_DO_MMIO:
642 run->exit_reason = KVM_EXIT_MMIO;
643 r = RESUME_HOST_NV;
644 break;
645 default:
646 BUG();
647 }
648 break;
649 }
650 case BOOK3S_INTERRUPT_SYSCALL:
a668f2bd
AG		 651 if (vcpu->arch.papr_enabled &&
652 (kvmppc_get_last_inst(vcpu) == 0x44000022) &&
653 !(vcpu->arch.shared->msr & MSR_PR)) {
654 /* SC 1 papr hypercalls */
655 ulong cmd = kvmppc_get_gpr(vcpu, 3);
656 int i;
657
658 if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
659 r = RESUME_GUEST;
660 break;
661 }
662
663 run->papr_hcall.nr = cmd;
664 for (i = 0; i < 9; ++i) {
665 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
666 run->papr_hcall.args[i] = gpr;
667 }
668 run->exit_reason = KVM_EXIT_PAPR_HCALL;
669 vcpu->arch.hcall_needed = 1;
670 r = RESUME_HOST;
671 } else if (vcpu->arch.osi_enabled &&
f05ed4d5
PM		 672 (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
673 (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
674 /* MOL hypercalls */
675 u64 *gprs = run->osi.gprs;
676 int i;
677
678 run->exit_reason = KVM_EXIT_OSI;
679 for (i = 0; i < 32; i++)
680 gprs[i] = kvmppc_get_gpr(vcpu, i);
681 vcpu->arch.osi_needed = 1;
682 r = RESUME_HOST_NV;
683 } else if (!(vcpu->arch.shared->msr & MSR_PR) &&
684 (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
685 /* KVM PV hypercalls */
686 kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
687 r = RESUME_GUEST;
688 } else {
689 /* Guest syscalls */
690 vcpu->stat.syscall_exits++;
691 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
692 r = RESUME_GUEST;
693 }
694 break;
695 case BOOK3S_INTERRUPT_FP_UNAVAIL:
696 case BOOK3S_INTERRUPT_ALTIVEC:
697 case BOOK3S_INTERRUPT_VSX:
698 {
699 int ext_msr = 0;
700
701 switch (exit_nr) {
702 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break;
703 case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break;
704 case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break;
705 }
706
707 switch (kvmppc_check_ext(vcpu, exit_nr)) {
708 case EMULATE_DONE:
709 /* everything ok - let's enable the ext */
710 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
711 break;
712 case EMULATE_FAIL:
713 /* we need to emulate this instruction */
714 goto program_interrupt;
715 break;
716 default:
717 /* nothing to worry about - go again */
718 break;
719 }
720 break;
721 }
722 case BOOK3S_INTERRUPT_ALIGNMENT:
723 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
724 vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
725 kvmppc_get_last_inst(vcpu));
726 vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
727 kvmppc_get_last_inst(vcpu));
728 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
729 }
730 r = RESUME_GUEST;
731 break;
732 case BOOK3S_INTERRUPT_MACHINE_CHECK:
733 case BOOK3S_INTERRUPT_TRACE:
734 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
735 r = RESUME_GUEST;
736 break;
737 default:
738 /* Ugh - bork here! What did we get? */
739 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
740 exit_nr, kvmppc_get_pc(vcpu), to_svcpu(vcpu)->shadow_srr1);
741 r = RESUME_HOST;
742 BUG();
743 break;
744 }
745
746
747 if (!(r & RESUME_HOST)) {
748 /* To avoid clobbering exit_reason, only check for signals if
749 * we aren't already exiting to userspace for some other
750 * reason. */
751 if (signal_pending(current)) {
752#ifdef EXIT_DEBUG
753 printk(KERN_EMERG "KVM: Going back to host\n");
754#endif
755 vcpu->stat.signal_exits++;
756 run->exit_reason = KVM_EXIT_INTR;
757 r = -EINTR;
758 } else {
759 /* In case an interrupt came in that was triggered
760 * from userspace (like DEC), we need to check what
761 * to inject now! */
762 kvmppc_core_deliver_interrupts(vcpu);
763 }
764 }
765
766 trace_kvm_book3s_reenter(r, vcpu);
767
768 return r;
769}
770
771int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
772 struct kvm_sregs *sregs)
773{
774 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
775 int i;
776
777 sregs->pvr = vcpu->arch.pvr;
778
779 sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
780 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
781 for (i = 0; i < 64; i++) {
782 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
783 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
784 }
785 } else {
786 for (i = 0; i < 16; i++)
787 sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
788
789 for (i = 0; i < 8; i++) {
790 sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
791 sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
792 }
793 }
794
a15bd354
AG		 795 if (sregs->u.s.flags & KVM_SREGS_S_HIOR)
796 sregs->u.s.hior = to_book3s(vcpu)->hior;
797
f05ed4d5
PM		 798 return 0;
799}
800
801int 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
a15bd354
AG		 834 if (sregs->u.s.flags & KVM_SREGS_S_HIOR) {
835 to_book3s(vcpu)->hior_sregs = true;
836 to_book3s(vcpu)->hior = sregs->u.s.hior;
837 }
838
f05ed4d5
PM		 839 return 0;
840}
841
842int kvmppc_core_check_processor_compat(void)
843{
844 return 0;
845}
846
847struct kvm_vcpu *kvmppc_core_vcpu_create(struct kvm *kvm, unsigned int id)
848{
849 struct kvmppc_vcpu_book3s *vcpu_book3s;
850 struct kvm_vcpu *vcpu;
851 int err = -ENOMEM;
852 unsigned long p;
853
854 vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
855 if (!vcpu_book3s)
856 goto out;
857
858 vcpu_book3s->shadow_vcpu = (struct kvmppc_book3s_shadow_vcpu *)
859 kzalloc(sizeof(*vcpu_book3s->shadow_vcpu), GFP_KERNEL);
860 if (!vcpu_book3s->shadow_vcpu)
861 goto free_vcpu;
862
863 vcpu = &vcpu_book3s->vcpu;
864 err = kvm_vcpu_init(vcpu, kvm, id);
865 if (err)
866 goto free_shadow_vcpu;
867
868 p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
869 /* the real shared page fills the last 4k of our page */
870 vcpu->arch.shared = (void*)(p + PAGE_SIZE - 4096);
871 if (!p)
872 goto uninit_vcpu;
873
874 vcpu->arch.host_retip = kvm_return_point;
875 vcpu->arch.host_msr = mfmsr();
876#ifdef CONFIG_PPC_BOOK3S_64
877 /* default to book3s_64 (970fx) */
878 vcpu->arch.pvr = 0x3C0301;
879#else
880 /* default to book3s_32 (750) */
881 vcpu->arch.pvr = 0x84202;
882#endif
883 kvmppc_set_pvr(vcpu, vcpu->arch.pvr);
884 vcpu->arch.slb_nr = 64;
885
886 /* remember where some real-mode handlers are */
887 vcpu->arch.trampoline_lowmem = __pa(kvmppc_handler_lowmem_trampoline);
888 vcpu->arch.trampoline_enter = __pa(kvmppc_handler_trampoline_enter);
889 vcpu->arch.highmem_handler = (ulong)kvmppc_handler_highmem;
890#ifdef CONFIG_PPC_BOOK3S_64
891 vcpu->arch.rmcall = *(ulong*)kvmppc_rmcall;
892#else
893 vcpu->arch.rmcall = (ulong)kvmppc_rmcall;
894#endif
895
896 vcpu->arch.shadow_msr = MSR_USER64;
897
898 err = kvmppc_mmu_init(vcpu);
899 if (err < 0)
900 goto uninit_vcpu;
901
902 return vcpu;
903
904uninit_vcpu:
905 kvm_vcpu_uninit(vcpu);
906free_shadow_vcpu:
907 kfree(vcpu_book3s->shadow_vcpu);
908free_vcpu:
909 vfree(vcpu_book3s);
910out:
911 return ERR_PTR(err);
912}
913
914void kvmppc_core_vcpu_free(struct kvm_vcpu *vcpu)
915{
916 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
917
918 free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
919 kvm_vcpu_uninit(vcpu);
920 kfree(vcpu_book3s->shadow_vcpu);
921 vfree(vcpu_book3s);
922}
923
df6909e5 924int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
f05ed4d5
PM		 925{
926 int ret;
927 double fpr[32][TS_FPRWIDTH];
928 unsigned int fpscr;
929 int fpexc_mode;
930#ifdef CONFIG_ALTIVEC
931 vector128 vr[32];
932 vector128 vscr;
933 unsigned long uninitialized_var(vrsave);
934 int used_vr;
935#endif
936#ifdef CONFIG_VSX
937 int used_vsr;
938#endif
939 ulong ext_msr;
940
941 /* No need to go into the guest when all we do is going out */
942 if (signal_pending(current)) {
943 kvm_run->exit_reason = KVM_EXIT_INTR;
944 return -EINTR;
945 }
946
947 /* Save FPU state in stack */
948 if (current->thread.regs->msr & MSR_FP)
949 giveup_fpu(current);
950 memcpy(fpr, current->thread.fpr, sizeof(current->thread.fpr));
951 fpscr = current->thread.fpscr.val;
952 fpexc_mode = current->thread.fpexc_mode;
953
954#ifdef CONFIG_ALTIVEC
955 /* Save Altivec state in stack */
956 used_vr = current->thread.used_vr;
957 if (used_vr) {
958 if (current->thread.regs->msr & MSR_VEC)
959 giveup_altivec(current);
960 memcpy(vr, current->thread.vr, sizeof(current->thread.vr));
961 vscr = current->thread.vscr;
962 vrsave = current->thread.vrsave;
963 }
964#endif
965
966#ifdef CONFIG_VSX
967 /* Save VSX state in stack */
968 used_vsr = current->thread.used_vsr;
969 if (used_vsr && (current->thread.regs->msr & MSR_VSX))
970 __giveup_vsx(current);
971#endif
972
973 /* Remember the MSR with disabled extensions */
974 ext_msr = current->thread.regs->msr;
975
f05ed4d5
PM		 976 /* Preload FPU if it's enabled */
977 if (vcpu->arch.shared->msr & MSR_FP)
978 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
979
df6909e5
PM		 980 kvm_guest_enter();
981
982 ret = __kvmppc_vcpu_run(kvm_run, vcpu);
983
984 kvm_guest_exit();
f05ed4d5
PM		 985
986 local_irq_disable();
987
988 current->thread.regs->msr = ext_msr;
989
990 /* Make sure we save the guest FPU/Altivec/VSX state */
991 kvmppc_giveup_ext(vcpu, MSR_FP);
992 kvmppc_giveup_ext(vcpu, MSR_VEC);
993 kvmppc_giveup_ext(vcpu, MSR_VSX);
994
995 /* Restore FPU state from stack */
996 memcpy(current->thread.fpr, fpr, sizeof(current->thread.fpr));
997 current->thread.fpscr.val = fpscr;
998 current->thread.fpexc_mode = fpexc_mode;
999
1000#ifdef CONFIG_ALTIVEC
1001 /* Restore Altivec state from stack */
1002 if (used_vr && current->thread.used_vr) {
1003 memcpy(current->thread.vr, vr, sizeof(current->thread.vr));
1004 current->thread.vscr = vscr;
1005 current->thread.vrsave = vrsave;
1006 }
1007 current->thread.used_vr = used_vr;
1008#endif
1009
1010#ifdef CONFIG_VSX
1011 current->thread.used_vsr = used_vsr;
1012#endif
1013
1014 return ret;
1015}
1016
f9e0554d
PM		 1017int kvmppc_core_prepare_memory_region(struct kvm *kvm,
1018 struct kvm_userspace_memory_region *mem)
1019{
1020 return 0;
1021}
1022
1023void kvmppc_core_commit_memory_region(struct kvm *kvm,
1024 struct kvm_userspace_memory_region *mem)
1025{
1026}
1027
1028int kvmppc_core_init_vm(struct kvm *kvm)
1029{
1030 return 0;
1031}
1032
1033void kvmppc_core_destroy_vm(struct kvm *kvm)
1034{
1035}
1036
f05ed4d5
PM		 1037static int kvmppc_book3s_init(void)
1038{
1039 int r;
1040
1041 r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_book3s), 0,
1042 THIS_MODULE);
1043
1044 if (r)
1045 return r;
1046
1047 r = kvmppc_mmu_hpte_sysinit();
1048
1049 return r;
1050}
1051
1052static void kvmppc_book3s_exit(void)
1053{
1054 kvmppc_mmu_hpte_sysexit();
1055 kvm_exit();
1056}
1057
1058module_init(kvmppc_book3s_init);
1059module_exit(kvmppc_book3s_exit);
Linux kernel - Deliverables
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