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KVM: PPC: Book3S: Controls for in-kernel sPAPR hypercall handling
[deliverable/linux.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 <asm/switch_to.h>
37 #include <asm/firmware.h>
38 #include <asm/hvcall.h>
39 #include <linux/gfp.h>
40 #include <linux/sched.h>
41 #include <linux/vmalloc.h>
42 #include <linux/highmem.h>
43 #include <linux/module.h>
44 #include <linux/miscdevice.h>
45
46 #include "book3s.h"
47
48 #define CREATE_TRACE_POINTS
49 #include "trace_pr.h"
50
51 /* #define EXIT_DEBUG */
52 /* #define DEBUG_EXT */
53
54 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
55 ulong msr);
56 static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac);
57
58 /* Some compatibility defines */
59 #ifdef CONFIG_PPC_BOOK3S_32
60 #define MSR_USER32 MSR_USER
61 #define MSR_USER64 MSR_USER
62 #define HW_PAGE_SIZE PAGE_SIZE
63 #endif
64
65 static void kvmppc_core_vcpu_load_pr(struct kvm_vcpu *vcpu, int cpu)
66 {
67 #ifdef CONFIG_PPC_BOOK3S_64
68 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
69 memcpy(svcpu->slb, to_book3s(vcpu)->slb_shadow, sizeof(svcpu->slb));
70 svcpu->slb_max = to_book3s(vcpu)->slb_shadow_max;
71 svcpu->in_use = 0;
72 svcpu_put(svcpu);
73 #endif
74
75 /* Disable AIL if supported */
76 if (cpu_has_feature(CPU_FTR_HVMODE) &&
77 cpu_has_feature(CPU_FTR_ARCH_207S))
78 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) & ~LPCR_AIL);
79
80 vcpu->cpu = smp_processor_id();
81 #ifdef CONFIG_PPC_BOOK3S_32
82 current->thread.kvm_shadow_vcpu = vcpu->arch.shadow_vcpu;
83 #endif
84 }
85
86 static void kvmppc_core_vcpu_put_pr(struct kvm_vcpu *vcpu)
87 {
88 #ifdef CONFIG_PPC_BOOK3S_64
89 struct kvmppc_book3s_shadow_vcpu *svcpu = svcpu_get(vcpu);
90 if (svcpu->in_use) {
91 kvmppc_copy_from_svcpu(vcpu, svcpu);
92 }
93 memcpy(to_book3s(vcpu)->slb_shadow, svcpu->slb, sizeof(svcpu->slb));
94 to_book3s(vcpu)->slb_shadow_max = svcpu->slb_max;
95 svcpu_put(svcpu);
96 #endif
97
98 kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
99 kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
100
101 /* Enable AIL if supported */
102 if (cpu_has_feature(CPU_FTR_HVMODE) &&
103 cpu_has_feature(CPU_FTR_ARCH_207S))
104 mtspr(SPRN_LPCR, mfspr(SPRN_LPCR) | LPCR_AIL_3);
105
106 vcpu->cpu = -1;
107 }
108
109 /* Copy data needed by real-mode code from vcpu to shadow vcpu */
110 void kvmppc_copy_to_svcpu(struct kvmppc_book3s_shadow_vcpu *svcpu,
111 struct kvm_vcpu *vcpu)
112 {
113 svcpu->gpr[0] = vcpu->arch.gpr[0];
114 svcpu->gpr[1] = vcpu->arch.gpr[1];
115 svcpu->gpr[2] = vcpu->arch.gpr[2];
116 svcpu->gpr[3] = vcpu->arch.gpr[3];
117 svcpu->gpr[4] = vcpu->arch.gpr[4];
118 svcpu->gpr[5] = vcpu->arch.gpr[5];
119 svcpu->gpr[6] = vcpu->arch.gpr[6];
120 svcpu->gpr[7] = vcpu->arch.gpr[7];
121 svcpu->gpr[8] = vcpu->arch.gpr[8];
122 svcpu->gpr[9] = vcpu->arch.gpr[9];
123 svcpu->gpr[10] = vcpu->arch.gpr[10];
124 svcpu->gpr[11] = vcpu->arch.gpr[11];
125 svcpu->gpr[12] = vcpu->arch.gpr[12];
126 svcpu->gpr[13] = vcpu->arch.gpr[13];
127 svcpu->cr = vcpu->arch.cr;
128 svcpu->xer = vcpu->arch.xer;
129 svcpu->ctr = vcpu->arch.ctr;
130 svcpu->lr = vcpu->arch.lr;
131 svcpu->pc = vcpu->arch.pc;
132 #ifdef CONFIG_PPC_BOOK3S_64
133 svcpu->shadow_fscr = vcpu->arch.shadow_fscr;
134 #endif
135 /*
136 * Now also save the current time base value. We use this
137 * to find the guest purr and spurr value.
138 */
139 vcpu->arch.entry_tb = get_tb();
140 vcpu->arch.entry_vtb = get_vtb();
141 if (cpu_has_feature(CPU_FTR_ARCH_207S))
142 vcpu->arch.entry_ic = mfspr(SPRN_IC);
143 svcpu->in_use = true;
144 }
145
146 /* Copy data touched by real-mode code from shadow vcpu back to vcpu */
147 void kvmppc_copy_from_svcpu(struct kvm_vcpu *vcpu,
148 struct kvmppc_book3s_shadow_vcpu *svcpu)
149 {
150 /*
151 * vcpu_put would just call us again because in_use hasn't
152 * been updated yet.
153 */
154 preempt_disable();
155
156 /*
157 * Maybe we were already preempted and synced the svcpu from
158 * our preempt notifiers. Don't bother touching this svcpu then.
159 */
160 if (!svcpu->in_use)
161 goto out;
162
163 vcpu->arch.gpr[0] = svcpu->gpr[0];
164 vcpu->arch.gpr[1] = svcpu->gpr[1];
165 vcpu->arch.gpr[2] = svcpu->gpr[2];
166 vcpu->arch.gpr[3] = svcpu->gpr[3];
167 vcpu->arch.gpr[4] = svcpu->gpr[4];
168 vcpu->arch.gpr[5] = svcpu->gpr[5];
169 vcpu->arch.gpr[6] = svcpu->gpr[6];
170 vcpu->arch.gpr[7] = svcpu->gpr[7];
171 vcpu->arch.gpr[8] = svcpu->gpr[8];
172 vcpu->arch.gpr[9] = svcpu->gpr[9];
173 vcpu->arch.gpr[10] = svcpu->gpr[10];
174 vcpu->arch.gpr[11] = svcpu->gpr[11];
175 vcpu->arch.gpr[12] = svcpu->gpr[12];
176 vcpu->arch.gpr[13] = svcpu->gpr[13];
177 vcpu->arch.cr = svcpu->cr;
178 vcpu->arch.xer = svcpu->xer;
179 vcpu->arch.ctr = svcpu->ctr;
180 vcpu->arch.lr = svcpu->lr;
181 vcpu->arch.pc = svcpu->pc;
182 vcpu->arch.shadow_srr1 = svcpu->shadow_srr1;
183 vcpu->arch.fault_dar = svcpu->fault_dar;
184 vcpu->arch.fault_dsisr = svcpu->fault_dsisr;
185 vcpu->arch.last_inst = svcpu->last_inst;
186 #ifdef CONFIG_PPC_BOOK3S_64
187 vcpu->arch.shadow_fscr = svcpu->shadow_fscr;
188 #endif
189 /*
190 * Update purr and spurr using time base on exit.
191 */
192 vcpu->arch.purr += get_tb() - vcpu->arch.entry_tb;
193 vcpu->arch.spurr += get_tb() - vcpu->arch.entry_tb;
194 vcpu->arch.vtb += get_vtb() - vcpu->arch.entry_vtb;
195 if (cpu_has_feature(CPU_FTR_ARCH_207S))
196 vcpu->arch.ic += mfspr(SPRN_IC) - vcpu->arch.entry_ic;
197 svcpu->in_use = false;
198
199 out:
200 preempt_enable();
201 }
202
203 static int kvmppc_core_check_requests_pr(struct kvm_vcpu *vcpu)
204 {
205 int r = 1; /* Indicate we want to get back into the guest */
206
207 /* We misuse TLB_FLUSH to indicate that we want to clear
208 all shadow cache entries */
209 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
210 kvmppc_mmu_pte_flush(vcpu, 0, 0);
211
212 return r;
213 }
214
215 /************* MMU Notifiers *************/
216 static void do_kvm_unmap_hva(struct kvm *kvm, unsigned long start,
217 unsigned long end)
218 {
219 long i;
220 struct kvm_vcpu *vcpu;
221 struct kvm_memslots *slots;
222 struct kvm_memory_slot *memslot;
223
224 slots = kvm_memslots(kvm);
225 kvm_for_each_memslot(memslot, slots) {
226 unsigned long hva_start, hva_end;
227 gfn_t gfn, gfn_end;
228
229 hva_start = max(start, memslot->userspace_addr);
230 hva_end = min(end, memslot->userspace_addr +
231 (memslot->npages << PAGE_SHIFT));
232 if (hva_start >= hva_end)
233 continue;
234 /*
235 * {gfn(page) | page intersects with [hva_start, hva_end)} =
236 * {gfn, gfn+1, ..., gfn_end-1}.
237 */
238 gfn = hva_to_gfn_memslot(hva_start, memslot);
239 gfn_end = hva_to_gfn_memslot(hva_end + PAGE_SIZE - 1, memslot);
240 kvm_for_each_vcpu(i, vcpu, kvm)
241 kvmppc_mmu_pte_pflush(vcpu, gfn << PAGE_SHIFT,
242 gfn_end << PAGE_SHIFT);
243 }
244 }
245
246 static int kvm_unmap_hva_pr(struct kvm *kvm, unsigned long hva)
247 {
248 trace_kvm_unmap_hva(hva);
249
250 do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
251
252 return 0;
253 }
254
255 static int kvm_unmap_hva_range_pr(struct kvm *kvm, unsigned long start,
256 unsigned long end)
257 {
258 do_kvm_unmap_hva(kvm, start, end);
259
260 return 0;
261 }
262
263 static int kvm_age_hva_pr(struct kvm *kvm, unsigned long hva)
264 {
265 /* XXX could be more clever ;) */
266 return 0;
267 }
268
269 static int kvm_test_age_hva_pr(struct kvm *kvm, unsigned long hva)
270 {
271 /* XXX could be more clever ;) */
272 return 0;
273 }
274
275 static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
276 {
277 /* The page will get remapped properly on its next fault */
278 do_kvm_unmap_hva(kvm, hva, hva + PAGE_SIZE);
279 }
280
281 /*****************************************/
282
283 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
284 {
285 ulong guest_msr = kvmppc_get_msr(vcpu);
286 ulong smsr = guest_msr;
287
288 /* Guest MSR values */
289 smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
290 /* Process MSR values */
291 smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
292 /* External providers the guest reserved */
293 smsr |= (guest_msr & vcpu->arch.guest_owned_ext);
294 /* 64-bit Process MSR values */
295 #ifdef CONFIG_PPC_BOOK3S_64
296 smsr |= MSR_ISF | MSR_HV;
297 #endif
298 vcpu->arch.shadow_msr = smsr;
299 }
300
301 static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
302 {
303 ulong old_msr = kvmppc_get_msr(vcpu);
304
305 #ifdef EXIT_DEBUG
306 printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
307 #endif
308
309 msr &= to_book3s(vcpu)->msr_mask;
310 kvmppc_set_msr_fast(vcpu, msr);
311 kvmppc_recalc_shadow_msr(vcpu);
312
313 if (msr & MSR_POW) {
314 if (!vcpu->arch.pending_exceptions) {
315 kvm_vcpu_block(vcpu);
316 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
317 vcpu->stat.halt_wakeup++;
318
319 /* Unset POW bit after we woke up */
320 msr &= ~MSR_POW;
321 kvmppc_set_msr_fast(vcpu, msr);
322 }
323 }
324
325 if ((kvmppc_get_msr(vcpu) & (MSR_PR|MSR_IR|MSR_DR)) !=
326 (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
327 kvmppc_mmu_flush_segments(vcpu);
328 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
329
330 /* Preload magic page segment when in kernel mode */
331 if (!(msr & MSR_PR) && vcpu->arch.magic_page_pa) {
332 struct kvm_vcpu_arch *a = &vcpu->arch;
333
334 if (msr & MSR_DR)
335 kvmppc_mmu_map_segment(vcpu, a->magic_page_ea);
336 else
337 kvmppc_mmu_map_segment(vcpu, a->magic_page_pa);
338 }
339 }
340
341 /*
342 * When switching from 32 to 64-bit, we may have a stale 32-bit
343 * magic page around, we need to flush it. Typically 32-bit magic
344 * page will be instanciated when calling into RTAS. Note: We
345 * assume that such transition only happens while in kernel mode,
346 * ie, we never transition from user 32-bit to kernel 64-bit with
347 * a 32-bit magic page around.
348 */
349 if (vcpu->arch.magic_page_pa &&
350 !(old_msr & MSR_PR) && !(old_msr & MSR_SF) && (msr & MSR_SF)) {
351 /* going from RTAS to normal kernel code */
352 kvmppc_mmu_pte_flush(vcpu, (uint32_t)vcpu->arch.magic_page_pa,
353 ~0xFFFUL);
354 }
355
356 /* Preload FPU if it's enabled */
357 if (kvmppc_get_msr(vcpu) & MSR_FP)
358 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
359 }
360
361 void kvmppc_set_pvr_pr(struct kvm_vcpu *vcpu, u32 pvr)
362 {
363 u32 host_pvr;
364
365 vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
366 vcpu->arch.pvr = pvr;
367 #ifdef CONFIG_PPC_BOOK3S_64
368 if ((pvr >= 0x330000) && (pvr < 0x70330000)) {
369 kvmppc_mmu_book3s_64_init(vcpu);
370 if (!to_book3s(vcpu)->hior_explicit)
371 to_book3s(vcpu)->hior = 0xfff00000;
372 to_book3s(vcpu)->msr_mask = 0xffffffffffffffffULL;
373 vcpu->arch.cpu_type = KVM_CPU_3S_64;
374 } else
375 #endif
376 {
377 kvmppc_mmu_book3s_32_init(vcpu);
378 if (!to_book3s(vcpu)->hior_explicit)
379 to_book3s(vcpu)->hior = 0;
380 to_book3s(vcpu)->msr_mask = 0xffffffffULL;
381 vcpu->arch.cpu_type = KVM_CPU_3S_32;
382 }
383
384 kvmppc_sanity_check(vcpu);
385
386 /* If we are in hypervisor level on 970, we can tell the CPU to
387 * treat DCBZ as 32 bytes store */
388 vcpu->arch.hflags &= ~BOOK3S_HFLAG_DCBZ32;
389 if (vcpu->arch.mmu.is_dcbz32(vcpu) && (mfmsr() & MSR_HV) &&
390 !strcmp(cur_cpu_spec->platform, "ppc970"))
391 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
392
393 /* Cell performs badly if MSR_FEx are set. So let's hope nobody
394 really needs them in a VM on Cell and force disable them. */
395 if (!strcmp(cur_cpu_spec->platform, "ppc-cell-be"))
396 to_book3s(vcpu)->msr_mask &= ~(MSR_FE0 | MSR_FE1);
397
398 /*
399 * If they're asking for POWER6 or later, set the flag
400 * indicating that we can do multiple large page sizes
401 * and 1TB segments.
402 * Also set the flag that indicates that tlbie has the large
403 * page bit in the RB operand instead of the instruction.
404 */
405 switch (PVR_VER(pvr)) {
406 case PVR_POWER6:
407 case PVR_POWER7:
408 case PVR_POWER7p:
409 case PVR_POWER8:
410 vcpu->arch.hflags |= BOOK3S_HFLAG_MULTI_PGSIZE |
411 BOOK3S_HFLAG_NEW_TLBIE;
412 break;
413 }
414
415 #ifdef CONFIG_PPC_BOOK3S_32
416 /* 32 bit Book3S always has 32 byte dcbz */
417 vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
418 #endif
419
420 /* On some CPUs we can execute paired single operations natively */
421 asm ( "mfpvr %0" : "=r"(host_pvr));
422 switch (host_pvr) {
423 case 0x00080200: /* lonestar 2.0 */
424 case 0x00088202: /* lonestar 2.2 */
425 case 0x70000100: /* gekko 1.0 */
426 case 0x00080100: /* gekko 2.0 */
427 case 0x00083203: /* gekko 2.3a */
428 case 0x00083213: /* gekko 2.3b */
429 case 0x00083204: /* gekko 2.4 */
430 case 0x00083214: /* gekko 2.4e (8SE) - retail HW2 */
431 case 0x00087200: /* broadway */
432 vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
433 /* Enable HID2.PSE - in case we need it later */
434 mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
435 }
436 }
437
438 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
439 * make Book3s_32 Linux work on Book3s_64, we have to make sure we trap dcbz to
440 * emulate 32 bytes dcbz length.
441 *
442 * The Book3s_64 inventors also realized this case and implemented a special bit
443 * in the HID5 register, which is a hypervisor ressource. Thus we can't use it.
444 *
445 * My approach here is to patch the dcbz instruction on executing pages.
446 */
447 static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
448 {
449 struct page *hpage;
450 u64 hpage_offset;
451 u32 *page;
452 int i;
453
454 hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
455 if (is_error_page(hpage))
456 return;
457
458 hpage_offset = pte->raddr & ~PAGE_MASK;
459 hpage_offset &= ~0xFFFULL;
460 hpage_offset /= 4;
461
462 get_page(hpage);
463 page = kmap_atomic(hpage);
464
465 /* patch dcbz into reserved instruction, so we trap */
466 for (i=hpage_offset; i < hpage_offset + (HW_PAGE_SIZE / 4); i++)
467 if ((be32_to_cpu(page[i]) & 0xff0007ff) == INS_DCBZ)
468 page[i] &= cpu_to_be32(0xfffffff7);
469
470 kunmap_atomic(page);
471 put_page(hpage);
472 }
473
474 static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
475 {
476 ulong mp_pa = vcpu->arch.magic_page_pa;
477
478 if (!(kvmppc_get_msr(vcpu) & MSR_SF))
479 mp_pa = (uint32_t)mp_pa;
480
481 if (unlikely(mp_pa) &&
482 unlikely((mp_pa & KVM_PAM) >> PAGE_SHIFT == gfn)) {
483 return 1;
484 }
485
486 return kvm_is_visible_gfn(vcpu->kvm, gfn);
487 }
488
489 int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
490 ulong eaddr, int vec)
491 {
492 bool data = (vec == BOOK3S_INTERRUPT_DATA_STORAGE);
493 bool iswrite = false;
494 int r = RESUME_GUEST;
495 int relocated;
496 int page_found = 0;
497 struct kvmppc_pte pte;
498 bool is_mmio = false;
499 bool dr = (kvmppc_get_msr(vcpu) & MSR_DR) ? true : false;
500 bool ir = (kvmppc_get_msr(vcpu) & MSR_IR) ? true : false;
501 u64 vsid;
502
503 relocated = data ? dr : ir;
504 if (data && (vcpu->arch.fault_dsisr & DSISR_ISSTORE))
505 iswrite = true;
506
507 /* Resolve real address if translation turned on */
508 if (relocated) {
509 page_found = vcpu->arch.mmu.xlate(vcpu, eaddr, &pte, data, iswrite);
510 } else {
511 pte.may_execute = true;
512 pte.may_read = true;
513 pte.may_write = true;
514 pte.raddr = eaddr & KVM_PAM;
515 pte.eaddr = eaddr;
516 pte.vpage = eaddr >> 12;
517 pte.page_size = MMU_PAGE_64K;
518 }
519
520 switch (kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) {
521 case 0:
522 pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
523 break;
524 case MSR_DR:
525 case MSR_IR:
526 vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
527
528 if ((kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) == MSR_DR)
529 pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
530 else
531 pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
532 pte.vpage |= vsid;
533
534 if (vsid == -1)
535 page_found = -EINVAL;
536 break;
537 }
538
539 if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
540 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
541 /*
542 * If we do the dcbz hack, we have to NX on every execution,
543 * so we can patch the executing code. This renders our guest
544 * NX-less.
545 */
546 pte.may_execute = !data;
547 }
548
549 if (page_found == -ENOENT) {
550 /* Page not found in guest PTE entries */
551 u64 ssrr1 = vcpu->arch.shadow_srr1;
552 u64 msr = kvmppc_get_msr(vcpu);
553 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
554 kvmppc_set_dsisr(vcpu, vcpu->arch.fault_dsisr);
555 kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
556 kvmppc_book3s_queue_irqprio(vcpu, vec);
557 } else if (page_found == -EPERM) {
558 /* Storage protection */
559 u32 dsisr = vcpu->arch.fault_dsisr;
560 u64 ssrr1 = vcpu->arch.shadow_srr1;
561 u64 msr = kvmppc_get_msr(vcpu);
562 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
563 dsisr = (dsisr & ~DSISR_NOHPTE) | DSISR_PROTFAULT;
564 kvmppc_set_dsisr(vcpu, dsisr);
565 kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
566 kvmppc_book3s_queue_irqprio(vcpu, vec);
567 } else if (page_found == -EINVAL) {
568 /* Page not found in guest SLB */
569 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
570 kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
571 } else if (!is_mmio &&
572 kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
573 if (data && !(vcpu->arch.fault_dsisr & DSISR_NOHPTE)) {
574 /*
575 * There is already a host HPTE there, presumably
576 * a read-only one for a page the guest thinks
577 * is writable, so get rid of it first.
578 */
579 kvmppc_mmu_unmap_page(vcpu, &pte);
580 }
581 /* The guest's PTE is not mapped yet. Map on the host */
582 kvmppc_mmu_map_page(vcpu, &pte, iswrite);
583 if (data)
584 vcpu->stat.sp_storage++;
585 else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
586 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32)))
587 kvmppc_patch_dcbz(vcpu, &pte);
588 } else {
589 /* MMIO */
590 vcpu->stat.mmio_exits++;
591 vcpu->arch.paddr_accessed = pte.raddr;
592 vcpu->arch.vaddr_accessed = pte.eaddr;
593 r = kvmppc_emulate_mmio(run, vcpu);
594 if ( r == RESUME_HOST_NV )
595 r = RESUME_HOST;
596 }
597
598 return r;
599 }
600
601 static inline int get_fpr_index(int i)
602 {
603 return i * TS_FPRWIDTH;
604 }
605
606 /* Give up external provider (FPU, Altivec, VSX) */
607 void kvmppc_giveup_ext(struct kvm_vcpu *vcpu, ulong msr)
608 {
609 struct thread_struct *t = &current->thread;
610
611 /*
612 * VSX instructions can access FP and vector registers, so if
613 * we are giving up VSX, make sure we give up FP and VMX as well.
614 */
615 if (msr & MSR_VSX)
616 msr |= MSR_FP | MSR_VEC;
617
618 msr &= vcpu->arch.guest_owned_ext;
619 if (!msr)
620 return;
621
622 #ifdef DEBUG_EXT
623 printk(KERN_INFO "Giving up ext 0x%lx\n", msr);
624 #endif
625
626 if (msr & MSR_FP) {
627 /*
628 * Note that on CPUs with VSX, giveup_fpu stores
629 * both the traditional FP registers and the added VSX
630 * registers into thread.fp_state.fpr[].
631 */
632 if (t->regs->msr & MSR_FP)
633 giveup_fpu(current);
634 t->fp_save_area = NULL;
635 }
636
637 #ifdef CONFIG_ALTIVEC
638 if (msr & MSR_VEC) {
639 if (current->thread.regs->msr & MSR_VEC)
640 giveup_altivec(current);
641 t->vr_save_area = NULL;
642 }
643 #endif
644
645 vcpu->arch.guest_owned_ext &= ~(msr | MSR_VSX);
646 kvmppc_recalc_shadow_msr(vcpu);
647 }
648
649 /* Give up facility (TAR / EBB / DSCR) */
650 static void kvmppc_giveup_fac(struct kvm_vcpu *vcpu, ulong fac)
651 {
652 #ifdef CONFIG_PPC_BOOK3S_64
653 if (!(vcpu->arch.shadow_fscr & (1ULL << fac))) {
654 /* Facility not available to the guest, ignore giveup request*/
655 return;
656 }
657
658 switch (fac) {
659 case FSCR_TAR_LG:
660 vcpu->arch.tar = mfspr(SPRN_TAR);
661 mtspr(SPRN_TAR, current->thread.tar);
662 vcpu->arch.shadow_fscr &= ~FSCR_TAR;
663 break;
664 }
665 #endif
666 }
667
668 static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
669 {
670 ulong srr0 = kvmppc_get_pc(vcpu);
671 u32 last_inst = kvmppc_get_last_inst(vcpu);
672 int ret;
673
674 ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
675 if (ret == -ENOENT) {
676 ulong msr = kvmppc_get_msr(vcpu);
677
678 msr = kvmppc_set_field(msr, 33, 33, 1);
679 msr = kvmppc_set_field(msr, 34, 36, 0);
680 msr = kvmppc_set_field(msr, 42, 47, 0);
681 kvmppc_set_msr_fast(vcpu, msr);
682 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
683 return EMULATE_AGAIN;
684 }
685
686 return EMULATE_DONE;
687 }
688
689 static int kvmppc_check_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr)
690 {
691
692 /* Need to do paired single emulation? */
693 if (!(vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE))
694 return EMULATE_DONE;
695
696 /* Read out the instruction */
697 if (kvmppc_read_inst(vcpu) == EMULATE_DONE)
698 /* Need to emulate */
699 return EMULATE_FAIL;
700
701 return EMULATE_AGAIN;
702 }
703
704 /* Handle external providers (FPU, Altivec, VSX) */
705 static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
706 ulong msr)
707 {
708 struct thread_struct *t = &current->thread;
709
710 /* When we have paired singles, we emulate in software */
711 if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
712 return RESUME_GUEST;
713
714 if (!(kvmppc_get_msr(vcpu) & msr)) {
715 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
716 return RESUME_GUEST;
717 }
718
719 if (msr == MSR_VSX) {
720 /* No VSX? Give an illegal instruction interrupt */
721 #ifdef CONFIG_VSX
722 if (!cpu_has_feature(CPU_FTR_VSX))
723 #endif
724 {
725 kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
726 return RESUME_GUEST;
727 }
728
729 /*
730 * We have to load up all the FP and VMX registers before
731 * we can let the guest use VSX instructions.
732 */
733 msr = MSR_FP | MSR_VEC | MSR_VSX;
734 }
735
736 /* See if we already own all the ext(s) needed */
737 msr &= ~vcpu->arch.guest_owned_ext;
738 if (!msr)
739 return RESUME_GUEST;
740
741 #ifdef DEBUG_EXT
742 printk(KERN_INFO "Loading up ext 0x%lx\n", msr);
743 #endif
744
745 if (msr & MSR_FP) {
746 preempt_disable();
747 enable_kernel_fp();
748 load_fp_state(&vcpu->arch.fp);
749 t->fp_save_area = &vcpu->arch.fp;
750 preempt_enable();
751 }
752
753 if (msr & MSR_VEC) {
754 #ifdef CONFIG_ALTIVEC
755 preempt_disable();
756 enable_kernel_altivec();
757 load_vr_state(&vcpu->arch.vr);
758 t->vr_save_area = &vcpu->arch.vr;
759 preempt_enable();
760 #endif
761 }
762
763 t->regs->msr |= msr;
764 vcpu->arch.guest_owned_ext |= msr;
765 kvmppc_recalc_shadow_msr(vcpu);
766
767 return RESUME_GUEST;
768 }
769
770 /*
771 * Kernel code using FP or VMX could have flushed guest state to
772 * the thread_struct; if so, get it back now.
773 */
774 static void kvmppc_handle_lost_ext(struct kvm_vcpu *vcpu)
775 {
776 unsigned long lost_ext;
777
778 lost_ext = vcpu->arch.guest_owned_ext & ~current->thread.regs->msr;
779 if (!lost_ext)
780 return;
781
782 if (lost_ext & MSR_FP) {
783 preempt_disable();
784 enable_kernel_fp();
785 load_fp_state(&vcpu->arch.fp);
786 preempt_enable();
787 }
788 #ifdef CONFIG_ALTIVEC
789 if (lost_ext & MSR_VEC) {
790 preempt_disable();
791 enable_kernel_altivec();
792 load_vr_state(&vcpu->arch.vr);
793 preempt_enable();
794 }
795 #endif
796 current->thread.regs->msr |= lost_ext;
797 }
798
799 #ifdef CONFIG_PPC_BOOK3S_64
800
801 static void kvmppc_trigger_fac_interrupt(struct kvm_vcpu *vcpu, ulong fac)
802 {
803 /* Inject the Interrupt Cause field and trigger a guest interrupt */
804 vcpu->arch.fscr &= ~(0xffULL << 56);
805 vcpu->arch.fscr |= (fac << 56);
806 kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FAC_UNAVAIL);
807 }
808
809 static void kvmppc_emulate_fac(struct kvm_vcpu *vcpu, ulong fac)
810 {
811 enum emulation_result er = EMULATE_FAIL;
812
813 if (!(kvmppc_get_msr(vcpu) & MSR_PR))
814 er = kvmppc_emulate_instruction(vcpu->run, vcpu);
815
816 if ((er != EMULATE_DONE) && (er != EMULATE_AGAIN)) {
817 /* Couldn't emulate, trigger interrupt in guest */
818 kvmppc_trigger_fac_interrupt(vcpu, fac);
819 }
820 }
821
822 /* Enable facilities (TAR, EBB, DSCR) for the guest */
823 static int kvmppc_handle_fac(struct kvm_vcpu *vcpu, ulong fac)
824 {
825 bool guest_fac_enabled;
826 BUG_ON(!cpu_has_feature(CPU_FTR_ARCH_207S));
827
828 /*
829 * Not every facility is enabled by FSCR bits, check whether the
830 * guest has this facility enabled at all.
831 */
832 switch (fac) {
833 case FSCR_TAR_LG:
834 case FSCR_EBB_LG:
835 guest_fac_enabled = (vcpu->arch.fscr & (1ULL << fac));
836 break;
837 case FSCR_TM_LG:
838 guest_fac_enabled = kvmppc_get_msr(vcpu) & MSR_TM;
839 break;
840 default:
841 guest_fac_enabled = false;
842 break;
843 }
844
845 if (!guest_fac_enabled) {
846 /* Facility not enabled by the guest */
847 kvmppc_trigger_fac_interrupt(vcpu, fac);
848 return RESUME_GUEST;
849 }
850
851 switch (fac) {
852 case FSCR_TAR_LG:
853 /* TAR switching isn't lazy in Linux yet */
854 current->thread.tar = mfspr(SPRN_TAR);
855 mtspr(SPRN_TAR, vcpu->arch.tar);
856 vcpu->arch.shadow_fscr |= FSCR_TAR;
857 break;
858 default:
859 kvmppc_emulate_fac(vcpu, fac);
860 break;
861 }
862
863 return RESUME_GUEST;
864 }
865 #endif
866
867 int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
868 unsigned int exit_nr)
869 {
870 int r = RESUME_HOST;
871 int s;
872
873 vcpu->stat.sum_exits++;
874
875 run->exit_reason = KVM_EXIT_UNKNOWN;
876 run->ready_for_interrupt_injection = 1;
877
878 /* We get here with MSR.EE=1 */
879
880 trace_kvm_exit(exit_nr, vcpu);
881 kvm_guest_exit();
882
883 switch (exit_nr) {
884 case BOOK3S_INTERRUPT_INST_STORAGE:
885 {
886 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
887 vcpu->stat.pf_instruc++;
888
889 #ifdef CONFIG_PPC_BOOK3S_32
890 /* We set segments as unused segments when invalidating them. So
891 * treat the respective fault as segment fault. */
892 {
893 struct kvmppc_book3s_shadow_vcpu *svcpu;
894 u32 sr;
895
896 svcpu = svcpu_get(vcpu);
897 sr = svcpu->sr[kvmppc_get_pc(vcpu) >> SID_SHIFT];
898 svcpu_put(svcpu);
899 if (sr == SR_INVALID) {
900 kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
901 r = RESUME_GUEST;
902 break;
903 }
904 }
905 #endif
906
907 /* only care about PTEG not found errors, but leave NX alone */
908 if (shadow_srr1 & 0x40000000) {
909 int idx = srcu_read_lock(&vcpu->kvm->srcu);
910 r = kvmppc_handle_pagefault(run, vcpu, kvmppc_get_pc(vcpu), exit_nr);
911 srcu_read_unlock(&vcpu->kvm->srcu, idx);
912 vcpu->stat.sp_instruc++;
913 } else if (vcpu->arch.mmu.is_dcbz32(vcpu) &&
914 (!(vcpu->arch.hflags & BOOK3S_HFLAG_DCBZ32))) {
915 /*
916 * XXX If we do the dcbz hack we use the NX bit to flush&patch the page,
917 * so we can't use the NX bit inside the guest. Let's cross our fingers,
918 * that no guest that needs the dcbz hack does NX.
919 */
920 kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
921 r = RESUME_GUEST;
922 } else {
923 u64 msr = kvmppc_get_msr(vcpu);
924 msr |= shadow_srr1 & 0x58000000;
925 kvmppc_set_msr_fast(vcpu, msr);
926 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
927 r = RESUME_GUEST;
928 }
929 break;
930 }
931 case BOOK3S_INTERRUPT_DATA_STORAGE:
932 {
933 ulong dar = kvmppc_get_fault_dar(vcpu);
934 u32 fault_dsisr = vcpu->arch.fault_dsisr;
935 vcpu->stat.pf_storage++;
936
937 #ifdef CONFIG_PPC_BOOK3S_32
938 /* We set segments as unused segments when invalidating them. So
939 * treat the respective fault as segment fault. */
940 {
941 struct kvmppc_book3s_shadow_vcpu *svcpu;
942 u32 sr;
943
944 svcpu = svcpu_get(vcpu);
945 sr = svcpu->sr[dar >> SID_SHIFT];
946 svcpu_put(svcpu);
947 if (sr == SR_INVALID) {
948 kvmppc_mmu_map_segment(vcpu, dar);
949 r = RESUME_GUEST;
950 break;
951 }
952 }
953 #endif
954
955 /*
956 * We need to handle missing shadow PTEs, and
957 * protection faults due to us mapping a page read-only
958 * when the guest thinks it is writable.
959 */
960 if (fault_dsisr & (DSISR_NOHPTE | DSISR_PROTFAULT)) {
961 int idx = srcu_read_lock(&vcpu->kvm->srcu);
962 r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
963 srcu_read_unlock(&vcpu->kvm->srcu, idx);
964 } else {
965 kvmppc_set_dar(vcpu, dar);
966 kvmppc_set_dsisr(vcpu, fault_dsisr);
967 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
968 r = RESUME_GUEST;
969 }
970 break;
971 }
972 case BOOK3S_INTERRUPT_DATA_SEGMENT:
973 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
974 kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
975 kvmppc_book3s_queue_irqprio(vcpu,
976 BOOK3S_INTERRUPT_DATA_SEGMENT);
977 }
978 r = RESUME_GUEST;
979 break;
980 case BOOK3S_INTERRUPT_INST_SEGMENT:
981 if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu)) < 0) {
982 kvmppc_book3s_queue_irqprio(vcpu,
983 BOOK3S_INTERRUPT_INST_SEGMENT);
984 }
985 r = RESUME_GUEST;
986 break;
987 /* We're good on these - the host merely wanted to get our attention */
988 case BOOK3S_INTERRUPT_DECREMENTER:
989 case BOOK3S_INTERRUPT_HV_DECREMENTER:
990 case BOOK3S_INTERRUPT_DOORBELL:
991 case BOOK3S_INTERRUPT_H_DOORBELL:
992 vcpu->stat.dec_exits++;
993 r = RESUME_GUEST;
994 break;
995 case BOOK3S_INTERRUPT_EXTERNAL:
996 case BOOK3S_INTERRUPT_EXTERNAL_LEVEL:
997 case BOOK3S_INTERRUPT_EXTERNAL_HV:
998 vcpu->stat.ext_intr_exits++;
999 r = RESUME_GUEST;
1000 break;
1001 case BOOK3S_INTERRUPT_PERFMON:
1002 r = RESUME_GUEST;
1003 break;
1004 case BOOK3S_INTERRUPT_PROGRAM:
1005 case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
1006 {
1007 enum emulation_result er;
1008 ulong flags;
1009
1010 program_interrupt:
1011 flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
1012
1013 if (kvmppc_get_msr(vcpu) & MSR_PR) {
1014 #ifdef EXIT_DEBUG
1015 printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
1016 #endif
1017 if ((kvmppc_get_last_inst(vcpu) & 0xff0007ff) !=
1018 (INS_DCBZ & 0xfffffff7)) {
1019 kvmppc_core_queue_program(vcpu, flags);
1020 r = RESUME_GUEST;
1021 break;
1022 }
1023 }
1024
1025 vcpu->stat.emulated_inst_exits++;
1026 er = kvmppc_emulate_instruction(run, vcpu);
1027 switch (er) {
1028 case EMULATE_DONE:
1029 r = RESUME_GUEST_NV;
1030 break;
1031 case EMULATE_AGAIN:
1032 r = RESUME_GUEST;
1033 break;
1034 case EMULATE_FAIL:
1035 printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
1036 __func__, kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
1037 kvmppc_core_queue_program(vcpu, flags);
1038 r = RESUME_GUEST;
1039 break;
1040 case EMULATE_DO_MMIO:
1041 run->exit_reason = KVM_EXIT_MMIO;
1042 r = RESUME_HOST_NV;
1043 break;
1044 case EMULATE_EXIT_USER:
1045 r = RESUME_HOST_NV;
1046 break;
1047 default:
1048 BUG();
1049 }
1050 break;
1051 }
1052 case BOOK3S_INTERRUPT_SYSCALL:
1053 if (vcpu->arch.papr_enabled &&
1054 (kvmppc_get_last_sc(vcpu) == 0x44000022) &&
1055 !(kvmppc_get_msr(vcpu) & MSR_PR)) {
1056 /* SC 1 papr hypercalls */
1057 ulong cmd = kvmppc_get_gpr(vcpu, 3);
1058 int i;
1059
1060 #ifdef CONFIG_PPC_BOOK3S_64
1061 if (kvmppc_h_pr(vcpu, cmd) == EMULATE_DONE) {
1062 r = RESUME_GUEST;
1063 break;
1064 }
1065 #endif
1066
1067 run->papr_hcall.nr = cmd;
1068 for (i = 0; i < 9; ++i) {
1069 ulong gpr = kvmppc_get_gpr(vcpu, 4 + i);
1070 run->papr_hcall.args[i] = gpr;
1071 }
1072 run->exit_reason = KVM_EXIT_PAPR_HCALL;
1073 vcpu->arch.hcall_needed = 1;
1074 r = RESUME_HOST;
1075 } else if (vcpu->arch.osi_enabled &&
1076 (((u32)kvmppc_get_gpr(vcpu, 3)) == OSI_SC_MAGIC_R3) &&
1077 (((u32)kvmppc_get_gpr(vcpu, 4)) == OSI_SC_MAGIC_R4)) {
1078 /* MOL hypercalls */
1079 u64 *gprs = run->osi.gprs;
1080 int i;
1081
1082 run->exit_reason = KVM_EXIT_OSI;
1083 for (i = 0; i < 32; i++)
1084 gprs[i] = kvmppc_get_gpr(vcpu, i);
1085 vcpu->arch.osi_needed = 1;
1086 r = RESUME_HOST_NV;
1087 } else if (!(kvmppc_get_msr(vcpu) & MSR_PR) &&
1088 (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
1089 /* KVM PV hypercalls */
1090 kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
1091 r = RESUME_GUEST;
1092 } else {
1093 /* Guest syscalls */
1094 vcpu->stat.syscall_exits++;
1095 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1096 r = RESUME_GUEST;
1097 }
1098 break;
1099 case BOOK3S_INTERRUPT_FP_UNAVAIL:
1100 case BOOK3S_INTERRUPT_ALTIVEC:
1101 case BOOK3S_INTERRUPT_VSX:
1102 {
1103 int ext_msr = 0;
1104
1105 switch (exit_nr) {
1106 case BOOK3S_INTERRUPT_FP_UNAVAIL: ext_msr = MSR_FP; break;
1107 case BOOK3S_INTERRUPT_ALTIVEC: ext_msr = MSR_VEC; break;
1108 case BOOK3S_INTERRUPT_VSX: ext_msr = MSR_VSX; break;
1109 }
1110
1111 switch (kvmppc_check_ext(vcpu, exit_nr)) {
1112 case EMULATE_DONE:
1113 /* everything ok - let's enable the ext */
1114 r = kvmppc_handle_ext(vcpu, exit_nr, ext_msr);
1115 break;
1116 case EMULATE_FAIL:
1117 /* we need to emulate this instruction */
1118 goto program_interrupt;
1119 break;
1120 default:
1121 /* nothing to worry about - go again */
1122 break;
1123 }
1124 break;
1125 }
1126 case BOOK3S_INTERRUPT_ALIGNMENT:
1127 if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
1128 u32 last_inst = kvmppc_get_last_inst(vcpu);
1129 u32 dsisr;
1130 u64 dar;
1131
1132 dsisr = kvmppc_alignment_dsisr(vcpu, last_inst);
1133 dar = kvmppc_alignment_dar(vcpu, last_inst);
1134
1135 kvmppc_set_dsisr(vcpu, dsisr);
1136 kvmppc_set_dar(vcpu, dar);
1137
1138 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1139 }
1140 r = RESUME_GUEST;
1141 break;
1142 #ifdef CONFIG_PPC_BOOK3S_64
1143 case BOOK3S_INTERRUPT_FAC_UNAVAIL:
1144 kvmppc_handle_fac(vcpu, vcpu->arch.shadow_fscr >> 56);
1145 r = RESUME_GUEST;
1146 break;
1147 #endif
1148 case BOOK3S_INTERRUPT_MACHINE_CHECK:
1149 case BOOK3S_INTERRUPT_TRACE:
1150 kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
1151 r = RESUME_GUEST;
1152 break;
1153 default:
1154 {
1155 ulong shadow_srr1 = vcpu->arch.shadow_srr1;
1156 /* Ugh - bork here! What did we get? */
1157 printk(KERN_EMERG "exit_nr=0x%x | pc=0x%lx | msr=0x%lx\n",
1158 exit_nr, kvmppc_get_pc(vcpu), shadow_srr1);
1159 r = RESUME_HOST;
1160 BUG();
1161 break;
1162 }
1163 }
1164
1165 if (!(r & RESUME_HOST)) {
1166 /* To avoid clobbering exit_reason, only check for signals if
1167 * we aren't already exiting to userspace for some other
1168 * reason. */
1169
1170 /*
1171 * Interrupts could be timers for the guest which we have to
1172 * inject again, so let's postpone them until we're in the guest
1173 * and if we really did time things so badly, then we just exit
1174 * again due to a host external interrupt.
1175 */
1176 s = kvmppc_prepare_to_enter(vcpu);
1177 if (s <= 0)
1178 r = s;
1179 else {
1180 /* interrupts now hard-disabled */
1181 kvmppc_fix_ee_before_entry();
1182 }
1183
1184 kvmppc_handle_lost_ext(vcpu);
1185 }
1186
1187 trace_kvm_book3s_reenter(r, vcpu);
1188
1189 return r;
1190 }
1191
1192 static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,
1193 struct kvm_sregs *sregs)
1194 {
1195 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1196 int i;
1197
1198 sregs->pvr = vcpu->arch.pvr;
1199
1200 sregs->u.s.sdr1 = to_book3s(vcpu)->sdr1;
1201 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1202 for (i = 0; i < 64; i++) {
1203 sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige | i;
1204 sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
1205 }
1206 } else {
1207 for (i = 0; i < 16; i++)
1208 sregs->u.s.ppc32.sr[i] = kvmppc_get_sr(vcpu, i);
1209
1210 for (i = 0; i < 8; i++) {
1211 sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
1212 sregs->u.s.ppc32.dbat[i] = vcpu3s->dbat[i].raw;
1213 }
1214 }
1215
1216 return 0;
1217 }
1218
1219 static int kvm_arch_vcpu_ioctl_set_sregs_pr(struct kvm_vcpu *vcpu,
1220 struct kvm_sregs *sregs)
1221 {
1222 struct kvmppc_vcpu_book3s *vcpu3s = to_book3s(vcpu);
1223 int i;
1224
1225 kvmppc_set_pvr_pr(vcpu, sregs->pvr);
1226
1227 vcpu3s->sdr1 = sregs->u.s.sdr1;
1228 if (vcpu->arch.hflags & BOOK3S_HFLAG_SLB) {
1229 for (i = 0; i < 64; i++) {
1230 vcpu->arch.mmu.slbmte(vcpu, sregs->u.s.ppc64.slb[i].slbv,
1231 sregs->u.s.ppc64.slb[i].slbe);
1232 }
1233 } else {
1234 for (i = 0; i < 16; i++) {
1235 vcpu->arch.mmu.mtsrin(vcpu, i, sregs->u.s.ppc32.sr[i]);
1236 }
1237 for (i = 0; i < 8; i++) {
1238 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), false,
1239 (u32)sregs->u.s.ppc32.ibat[i]);
1240 kvmppc_set_bat(vcpu, &(vcpu3s->ibat[i]), true,
1241 (u32)(sregs->u.s.ppc32.ibat[i] >> 32));
1242 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), false,
1243 (u32)sregs->u.s.ppc32.dbat[i]);
1244 kvmppc_set_bat(vcpu, &(vcpu3s->dbat[i]), true,
1245 (u32)(sregs->u.s.ppc32.dbat[i] >> 32));
1246 }
1247 }
1248
1249 /* Flush the MMU after messing with the segments */
1250 kvmppc_mmu_pte_flush(vcpu, 0, 0);
1251
1252 return 0;
1253 }
1254
1255 static int kvmppc_get_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1256 union kvmppc_one_reg *val)
1257 {
1258 int r = 0;
1259
1260 switch (id) {
1261 case KVM_REG_PPC_HIOR:
1262 *val = get_reg_val(id, to_book3s(vcpu)->hior);
1263 break;
1264 case KVM_REG_PPC_LPCR:
1265 /*
1266 * We are only interested in the LPCR_ILE bit
1267 */
1268 if (vcpu->arch.intr_msr & MSR_LE)
1269 *val = get_reg_val(id, LPCR_ILE);
1270 else
1271 *val = get_reg_val(id, 0);
1272 break;
1273 default:
1274 r = -EINVAL;
1275 break;
1276 }
1277
1278 return r;
1279 }
1280
1281 static void kvmppc_set_lpcr_pr(struct kvm_vcpu *vcpu, u64 new_lpcr)
1282 {
1283 if (new_lpcr & LPCR_ILE)
1284 vcpu->arch.intr_msr |= MSR_LE;
1285 else
1286 vcpu->arch.intr_msr &= ~MSR_LE;
1287 }
1288
1289 static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
1290 union kvmppc_one_reg *val)
1291 {
1292 int r = 0;
1293
1294 switch (id) {
1295 case KVM_REG_PPC_HIOR:
1296 to_book3s(vcpu)->hior = set_reg_val(id, *val);
1297 to_book3s(vcpu)->hior_explicit = true;
1298 break;
1299 case KVM_REG_PPC_LPCR:
1300 kvmppc_set_lpcr_pr(vcpu, set_reg_val(id, *val));
1301 break;
1302 default:
1303 r = -EINVAL;
1304 break;
1305 }
1306
1307 return r;
1308 }
1309
1310 static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
1311 unsigned int id)
1312 {
1313 struct kvmppc_vcpu_book3s *vcpu_book3s;
1314 struct kvm_vcpu *vcpu;
1315 int err = -ENOMEM;
1316 unsigned long p;
1317
1318 vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1319 if (!vcpu)
1320 goto out;
1321
1322 vcpu_book3s = vzalloc(sizeof(struct kvmppc_vcpu_book3s));
1323 if (!vcpu_book3s)
1324 goto free_vcpu;
1325 vcpu->arch.book3s = vcpu_book3s;
1326
1327 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1328 vcpu->arch.shadow_vcpu =
1329 kzalloc(sizeof(*vcpu->arch.shadow_vcpu), GFP_KERNEL);
1330 if (!vcpu->arch.shadow_vcpu)
1331 goto free_vcpu3s;
1332 #endif
1333
1334 err = kvm_vcpu_init(vcpu, kvm, id);
1335 if (err)
1336 goto free_shadow_vcpu;
1337
1338 err = -ENOMEM;
1339 p = __get_free_page(GFP_KERNEL|__GFP_ZERO);
1340 if (!p)
1341 goto uninit_vcpu;
1342 /* the real shared page fills the last 4k of our page */
1343 vcpu->arch.shared = (void *)(p + PAGE_SIZE - 4096);
1344 #ifdef CONFIG_PPC_BOOK3S_64
1345 /* Always start the shared struct in native endian mode */
1346 #ifdef __BIG_ENDIAN__
1347 vcpu->arch.shared_big_endian = true;
1348 #else
1349 vcpu->arch.shared_big_endian = false;
1350 #endif
1351
1352 /*
1353 * Default to the same as the host if we're on sufficiently
1354 * recent machine that we have 1TB segments;
1355 * otherwise default to PPC970FX.
1356 */
1357 vcpu->arch.pvr = 0x3C0301;
1358 if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
1359 vcpu->arch.pvr = mfspr(SPRN_PVR);
1360 vcpu->arch.intr_msr = MSR_SF;
1361 #else
1362 /* default to book3s_32 (750) */
1363 vcpu->arch.pvr = 0x84202;
1364 #endif
1365 kvmppc_set_pvr_pr(vcpu, vcpu->arch.pvr);
1366 vcpu->arch.slb_nr = 64;
1367
1368 vcpu->arch.shadow_msr = MSR_USER64 & ~MSR_LE;
1369
1370 err = kvmppc_mmu_init(vcpu);
1371 if (err < 0)
1372 goto uninit_vcpu;
1373
1374 return vcpu;
1375
1376 uninit_vcpu:
1377 kvm_vcpu_uninit(vcpu);
1378 free_shadow_vcpu:
1379 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1380 kfree(vcpu->arch.shadow_vcpu);
1381 free_vcpu3s:
1382 #endif
1383 vfree(vcpu_book3s);
1384 free_vcpu:
1385 kmem_cache_free(kvm_vcpu_cache, vcpu);
1386 out:
1387 return ERR_PTR(err);
1388 }
1389
1390 static void kvmppc_core_vcpu_free_pr(struct kvm_vcpu *vcpu)
1391 {
1392 struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
1393
1394 free_page((unsigned long)vcpu->arch.shared & PAGE_MASK);
1395 kvm_vcpu_uninit(vcpu);
1396 #ifdef CONFIG_KVM_BOOK3S_32_HANDLER
1397 kfree(vcpu->arch.shadow_vcpu);
1398 #endif
1399 vfree(vcpu_book3s);
1400 kmem_cache_free(kvm_vcpu_cache, vcpu);
1401 }
1402
1403 static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
1404 {
1405 int ret;
1406 #ifdef CONFIG_ALTIVEC
1407 unsigned long uninitialized_var(vrsave);
1408 #endif
1409
1410 /* Check if we can run the vcpu at all */
1411 if (!vcpu->arch.sane) {
1412 kvm_run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
1413 ret = -EINVAL;
1414 goto out;
1415 }
1416
1417 /*
1418 * Interrupts could be timers for the guest which we have to inject
1419 * again, so let's postpone them until we're in the guest and if we
1420 * really did time things so badly, then we just exit again due to
1421 * a host external interrupt.
1422 */
1423 ret = kvmppc_prepare_to_enter(vcpu);
1424 if (ret <= 0)
1425 goto out;
1426 /* interrupts now hard-disabled */
1427
1428 /* Save FPU state in thread_struct */
1429 if (current->thread.regs->msr & MSR_FP)
1430 giveup_fpu(current);
1431
1432 #ifdef CONFIG_ALTIVEC
1433 /* Save Altivec state in thread_struct */
1434 if (current->thread.regs->msr & MSR_VEC)
1435 giveup_altivec(current);
1436 #endif
1437
1438 #ifdef CONFIG_VSX
1439 /* Save VSX state in thread_struct */
1440 if (current->thread.regs->msr & MSR_VSX)
1441 __giveup_vsx(current);
1442 #endif
1443
1444 /* Preload FPU if it's enabled */
1445 if (kvmppc_get_msr(vcpu) & MSR_FP)
1446 kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
1447
1448 kvmppc_fix_ee_before_entry();
1449
1450 ret = __kvmppc_vcpu_run(kvm_run, vcpu);
1451
1452 /* No need for kvm_guest_exit. It's done in handle_exit.
1453 We also get here with interrupts enabled. */
1454
1455 /* Make sure we save the guest FPU/Altivec/VSX state */
1456 kvmppc_giveup_ext(vcpu, MSR_FP | MSR_VEC | MSR_VSX);
1457
1458 /* Make sure we save the guest TAR/EBB/DSCR state */
1459 kvmppc_giveup_fac(vcpu, FSCR_TAR_LG);
1460
1461 out:
1462 vcpu->mode = OUTSIDE_GUEST_MODE;
1463 return ret;
1464 }
1465
1466 /*
1467 * Get (and clear) the dirty memory log for a memory slot.
1468 */
1469 static int kvm_vm_ioctl_get_dirty_log_pr(struct kvm *kvm,
1470 struct kvm_dirty_log *log)
1471 {
1472 struct kvm_memory_slot *memslot;
1473 struct kvm_vcpu *vcpu;
1474 ulong ga, ga_end;
1475 int is_dirty = 0;
1476 int r;
1477 unsigned long n;
1478
1479 mutex_lock(&kvm->slots_lock);
1480
1481 r = kvm_get_dirty_log(kvm, log, &is_dirty);
1482 if (r)
1483 goto out;
1484
1485 /* If nothing is dirty, don't bother messing with page tables. */
1486 if (is_dirty) {
1487 memslot = id_to_memslot(kvm->memslots, log->slot);
1488
1489 ga = memslot->base_gfn << PAGE_SHIFT;
1490 ga_end = ga + (memslot->npages << PAGE_SHIFT);
1491
1492 kvm_for_each_vcpu(n, vcpu, kvm)
1493 kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
1494
1495 n = kvm_dirty_bitmap_bytes(memslot);
1496 memset(memslot->dirty_bitmap, 0, n);
1497 }
1498
1499 r = 0;
1500 out:
1501 mutex_unlock(&kvm->slots_lock);
1502 return r;
1503 }
1504
1505 static void kvmppc_core_flush_memslot_pr(struct kvm *kvm,
1506 struct kvm_memory_slot *memslot)
1507 {
1508 return;
1509 }
1510
1511 static int kvmppc_core_prepare_memory_region_pr(struct kvm *kvm,
1512 struct kvm_memory_slot *memslot,
1513 struct kvm_userspace_memory_region *mem)
1514 {
1515 return 0;
1516 }
1517
1518 static void kvmppc_core_commit_memory_region_pr(struct kvm *kvm,
1519 struct kvm_userspace_memory_region *mem,
1520 const struct kvm_memory_slot *old)
1521 {
1522 return;
1523 }
1524
1525 static void kvmppc_core_free_memslot_pr(struct kvm_memory_slot *free,
1526 struct kvm_memory_slot *dont)
1527 {
1528 return;
1529 }
1530
1531 static int kvmppc_core_create_memslot_pr(struct kvm_memory_slot *slot,
1532 unsigned long npages)
1533 {
1534 return 0;
1535 }
1536
1537
1538 #ifdef CONFIG_PPC64
1539 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1540 struct kvm_ppc_smmu_info *info)
1541 {
1542 long int i;
1543 struct kvm_vcpu *vcpu;
1544
1545 info->flags = 0;
1546
1547 /* SLB is always 64 entries */
1548 info->slb_size = 64;
1549
1550 /* Standard 4k base page size segment */
1551 info->sps[0].page_shift = 12;
1552 info->sps[0].slb_enc = 0;
1553 info->sps[0].enc[0].page_shift = 12;
1554 info->sps[0].enc[0].pte_enc = 0;
1555
1556 /*
1557 * 64k large page size.
1558 * We only want to put this in if the CPUs we're emulating
1559 * support it, but unfortunately we don't have a vcpu easily
1560 * to hand here to test. Just pick the first vcpu, and if
1561 * that doesn't exist yet, report the minimum capability,
1562 * i.e., no 64k pages.
1563 * 1T segment support goes along with 64k pages.
1564 */
1565 i = 1;
1566 vcpu = kvm_get_vcpu(kvm, 0);
1567 if (vcpu && (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
1568 info->flags = KVM_PPC_1T_SEGMENTS;
1569 info->sps[i].page_shift = 16;
1570 info->sps[i].slb_enc = SLB_VSID_L | SLB_VSID_LP_01;
1571 info->sps[i].enc[0].page_shift = 16;
1572 info->sps[i].enc[0].pte_enc = 1;
1573 ++i;
1574 }
1575
1576 /* Standard 16M large page size segment */
1577 info->sps[i].page_shift = 24;
1578 info->sps[i].slb_enc = SLB_VSID_L;
1579 info->sps[i].enc[0].page_shift = 24;
1580 info->sps[i].enc[0].pte_enc = 0;
1581
1582 return 0;
1583 }
1584 #else
1585 static int kvm_vm_ioctl_get_smmu_info_pr(struct kvm *kvm,
1586 struct kvm_ppc_smmu_info *info)
1587 {
1588 /* We should not get called */
1589 BUG();
1590 }
1591 #endif /* CONFIG_PPC64 */
1592
1593 static unsigned int kvm_global_user_count = 0;
1594 static DEFINE_SPINLOCK(kvm_global_user_count_lock);
1595
1596 static int kvmppc_core_init_vm_pr(struct kvm *kvm)
1597 {
1598 mutex_init(&kvm->arch.hpt_mutex);
1599
1600 #ifdef CONFIG_PPC_BOOK3S_64
1601 /* Start out with the default set of hcalls enabled */
1602 kvmppc_pr_init_default_hcalls(kvm);
1603 #endif
1604
1605 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1606 spin_lock(&kvm_global_user_count_lock);
1607 if (++kvm_global_user_count == 1)
1608 pSeries_disable_reloc_on_exc();
1609 spin_unlock(&kvm_global_user_count_lock);
1610 }
1611 return 0;
1612 }
1613
1614 static void kvmppc_core_destroy_vm_pr(struct kvm *kvm)
1615 {
1616 #ifdef CONFIG_PPC64
1617 WARN_ON(!list_empty(&kvm->arch.spapr_tce_tables));
1618 #endif
1619
1620 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
1621 spin_lock(&kvm_global_user_count_lock);
1622 BUG_ON(kvm_global_user_count == 0);
1623 if (--kvm_global_user_count == 0)
1624 pSeries_enable_reloc_on_exc();
1625 spin_unlock(&kvm_global_user_count_lock);
1626 }
1627 }
1628
1629 static int kvmppc_core_check_processor_compat_pr(void)
1630 {
1631 /* we are always compatible */
1632 return 0;
1633 }
1634
1635 static long kvm_arch_vm_ioctl_pr(struct file *filp,
1636 unsigned int ioctl, unsigned long arg)
1637 {
1638 return -ENOTTY;
1639 }
1640
1641 static struct kvmppc_ops kvm_ops_pr = {
1642 .get_sregs = kvm_arch_vcpu_ioctl_get_sregs_pr,
1643 .set_sregs = kvm_arch_vcpu_ioctl_set_sregs_pr,
1644 .get_one_reg = kvmppc_get_one_reg_pr,
1645 .set_one_reg = kvmppc_set_one_reg_pr,
1646 .vcpu_load = kvmppc_core_vcpu_load_pr,
1647 .vcpu_put = kvmppc_core_vcpu_put_pr,
1648 .set_msr = kvmppc_set_msr_pr,
1649 .vcpu_run = kvmppc_vcpu_run_pr,
1650 .vcpu_create = kvmppc_core_vcpu_create_pr,
1651 .vcpu_free = kvmppc_core_vcpu_free_pr,
1652 .check_requests = kvmppc_core_check_requests_pr,
1653 .get_dirty_log = kvm_vm_ioctl_get_dirty_log_pr,
1654 .flush_memslot = kvmppc_core_flush_memslot_pr,
1655 .prepare_memory_region = kvmppc_core_prepare_memory_region_pr,
1656 .commit_memory_region = kvmppc_core_commit_memory_region_pr,
1657 .unmap_hva = kvm_unmap_hva_pr,
1658 .unmap_hva_range = kvm_unmap_hva_range_pr,
1659 .age_hva = kvm_age_hva_pr,
1660 .test_age_hva = kvm_test_age_hva_pr,
1661 .set_spte_hva = kvm_set_spte_hva_pr,
1662 .mmu_destroy = kvmppc_mmu_destroy_pr,
1663 .free_memslot = kvmppc_core_free_memslot_pr,
1664 .create_memslot = kvmppc_core_create_memslot_pr,
1665 .init_vm = kvmppc_core_init_vm_pr,
1666 .destroy_vm = kvmppc_core_destroy_vm_pr,
1667 .get_smmu_info = kvm_vm_ioctl_get_smmu_info_pr,
1668 .emulate_op = kvmppc_core_emulate_op_pr,
1669 .emulate_mtspr = kvmppc_core_emulate_mtspr_pr,
1670 .emulate_mfspr = kvmppc_core_emulate_mfspr_pr,
1671 .fast_vcpu_kick = kvm_vcpu_kick,
1672 .arch_vm_ioctl = kvm_arch_vm_ioctl_pr,
1673 };
1674
1675
1676 int kvmppc_book3s_init_pr(void)
1677 {
1678 int r;
1679
1680 r = kvmppc_core_check_processor_compat_pr();
1681 if (r < 0)
1682 return r;
1683
1684 kvm_ops_pr.owner = THIS_MODULE;
1685 kvmppc_pr_ops = &kvm_ops_pr;
1686
1687 r = kvmppc_mmu_hpte_sysinit();
1688 return r;
1689 }
1690
1691 void kvmppc_book3s_exit_pr(void)
1692 {
1693 kvmppc_pr_ops = NULL;
1694 kvmppc_mmu_hpte_sysexit();
1695 }
1696
1697 /*
1698 * We only support separate modules for book3s 64
1699 */
1700 #ifdef CONFIG_PPC_BOOK3S_64
1701
1702 module_init(kvmppc_book3s_init_pr);
1703 module_exit(kvmppc_book3s_exit_pr);
1704
1705 MODULE_LICENSE("GPL");
1706 MODULE_ALIAS_MISCDEV(KVM_MINOR);
1707 MODULE_ALIAS("devname:kvm");
1708 #endif
Linux kernel - Deliverables
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