1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright 2010-2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
5 */
6
7 #include <linux/types.h>
8 #include <linux/string.h>
9 #include <linux/kvm.h>
10 #include <linux/kvm_host.h>
11 #include <linux/hugetlb.h>
12 #include <linux/module.h>
13 #include <linux/log2.h>
14 #include <linux/sizes.h>
15
16 #include <asm/trace.h>
17 #include <asm/kvm_ppc.h>
18 #include <asm/kvm_book3s.h>
19 #include <asm/book3s/64/mmu-hash.h>
20 #include <asm/hvcall.h>
21 #include <asm/synch.h>
22 #include <asm/ppc-opcode.h>
23 #include <asm/pte-walk.h>
24
25 /* Translate address of a vmalloc'd thing to a linear map address */
26 static void *real_vmalloc_addr(void *addr)
27 {
28 return __va(ppc_find_vmap_phys((unsigned long)addr));
29 }
30
31 /* Return 1 if we need to do a global tlbie, 0 if we can use tlbiel */
32 static int global_invalidates(struct kvm *kvm)
33 {
34 int global;
35 int cpu;
36
37 /*
38 * If there is only one vcore, and it's currently running,
39 * as indicated by local_paca->kvm_hstate.kvm_vcpu being set,
40 * we can use tlbiel as long as we mark all other physical
41 * cores as potentially having stale TLB entries for this lpid.
42 * Otherwise, don't use tlbiel.
43 */
44 if (kvm->arch.online_vcores == 1 && local_paca->kvm_hstate.kvm_vcpu)
45 global = 0;
46 else
47 global = 1;
48
49 /* LPID has been switched to host if in virt mode so can't do local */
50 if (!global && (mfmsr() & (MSR_IR|MSR_DR)))
51 global = 1;
52
53 if (!global) {
54 /* any other core might now have stale TLB entries... */
55 smp_wmb();
56 cpumask_setall(&kvm->arch.need_tlb_flush);
57 cpu = local_paca->kvm_hstate.kvm_vcore->pcpu;
58 cpumask_clear_cpu(cpu, &kvm->arch.need_tlb_flush);
59 }
60
61 return global;
62 }
63
64 /*
65 * Add this HPTE into the chain for the real page.
66 * Must be called with the chain locked; it unlocks the chain.
67 */
68 void kvmppc_add_revmap_chain(struct kvm *kvm, struct revmap_entry *rev,
69 unsigned long *rmap, long pte_index, int realmode)
70 {
71 struct revmap_entry *head, *tail;
72 unsigned long i;
73
74 if (*rmap & KVMPPC_RMAP_PRESENT) {
75 i = *rmap & KVMPPC_RMAP_INDEX;
76 head = &kvm->arch.hpt.rev[i];
77 if (realmode)
78 head = real_vmalloc_addr(head);
79 tail = &kvm->arch.hpt.rev[head->back];
80 if (realmode)
81 tail = real_vmalloc_addr(tail);
82 rev->forw = i;
83 rev->back = head->back;
84 tail->forw = pte_index;
85 head->back = pte_index;
86 } else {
87 rev->forw = rev->back = pte_index;
88 *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) |
89 pte_index | KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_HPT;
90 }
91 unlock_rmap(rmap);
92 }
93 EXPORT_SYMBOL_GPL(kvmppc_add_revmap_chain);
94
95 /* Update the dirty bitmap of a memslot */
96 void kvmppc_update_dirty_map(const struct kvm_memory_slot *memslot,
97 unsigned long gfn, unsigned long psize)
98 {
99 unsigned long npages;
100
101 if (!psize || !memslot->dirty_bitmap)
102 return;
103 npages = (psize + PAGE_SIZE - 1) / PAGE_SIZE;
104 gfn -= memslot->base_gfn;
105 set_dirty_bits_atomic(memslot->dirty_bitmap, gfn, npages);
106 }
107 EXPORT_SYMBOL_GPL(kvmppc_update_dirty_map);
108
109 static void kvmppc_set_dirty_from_hpte(struct kvm *kvm,
110 unsigned long hpte_v, unsigned long hpte_gr)
111 {
112 struct kvm_memory_slot *memslot;
113 unsigned long gfn;
114 unsigned long psize;
115
116 psize = kvmppc_actual_pgsz(hpte_v, hpte_gr);
117 gfn = hpte_rpn(hpte_gr, psize);
118 memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
119 if (memslot && memslot->dirty_bitmap)
120 kvmppc_update_dirty_map(memslot, gfn, psize);
121 }
122
123 /* Returns a pointer to the revmap entry for the page mapped by a HPTE */
124 static unsigned long *revmap_for_hpte(struct kvm *kvm, unsigned long hpte_v,
125 unsigned long hpte_gr,
126 struct kvm_memory_slot **memslotp,
127 unsigned long *gfnp)
128 {
129 struct kvm_memory_slot *memslot;
130 unsigned long *rmap;
131 unsigned long gfn;
132
133 gfn = hpte_rpn(hpte_gr, kvmppc_actual_pgsz(hpte_v, hpte_gr));
134 memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
135 if (memslotp)
136 *memslotp = memslot;
137 if (gfnp)
138 *gfnp = gfn;
139 if (!memslot)
140 return NULL;
141
142 rmap = real_vmalloc_addr(&memslot->arch.rmap[gfn - memslot->base_gfn]);
143 return rmap;
144 }
145
146 /* Remove this HPTE from the chain for a real page */
147 static void remove_revmap_chain(struct kvm *kvm, long pte_index,
148 struct revmap_entry *rev,
149 unsigned long hpte_v, unsigned long hpte_r)
150 {
151 struct revmap_entry *next, *prev;
152 unsigned long ptel, head;
153 unsigned long *rmap;
154 unsigned long rcbits;
155 struct kvm_memory_slot *memslot;
156 unsigned long gfn;
157
158 rcbits = hpte_r & (HPTE_R_R | HPTE_R_C);
159 ptel = rev->guest_rpte |= rcbits;
160 rmap = revmap_for_hpte(kvm, hpte_v, ptel, &memslot, &gfn);
161 if (!rmap)
162 return;
163 lock_rmap(rmap);
164
165 head = *rmap & KVMPPC_RMAP_INDEX;
166 next = real_vmalloc_addr(&kvm->arch.hpt.rev[rev->forw]);
167 prev = real_vmalloc_addr(&kvm->arch.hpt.rev[rev->back]);
168 next->back = rev->back;
169 prev->forw = rev->forw;
170 if (head == pte_index) {
171 head = rev->forw;
172 if (head == pte_index)
173 *rmap &= ~(KVMPPC_RMAP_PRESENT | KVMPPC_RMAP_INDEX);
174 else
175 *rmap = (*rmap & ~KVMPPC_RMAP_INDEX) | head;
176 }
177 *rmap |= rcbits << KVMPPC_RMAP_RC_SHIFT;
178 if (rcbits & HPTE_R_C)
179 kvmppc_update_dirty_map(memslot, gfn,
180 kvmppc_actual_pgsz(hpte_v, hpte_r));
181 unlock_rmap(rmap);
182 }
183
184 long kvmppc_do_h_enter(struct kvm *kvm, unsigned long flags,
185 long pte_index, unsigned long pteh, unsigned long ptel,
186 pgd_t *pgdir, bool realmode, unsigned long *pte_idx_ret)
187 {
188 unsigned long i, pa, gpa, gfn, psize;
189 unsigned long slot_fn, hva;
190 __be64 *hpte;
191 struct revmap_entry *rev;
192 unsigned long g_ptel;
193 struct kvm_memory_slot *memslot;
194 unsigned hpage_shift;
195 bool is_ci;
196 unsigned long *rmap;
197 pte_t *ptep;
198 unsigned int writing;
199 unsigned long mmu_seq;
200 unsigned long rcbits;
201
202 if (kvm_is_radix(kvm))
203 return H_FUNCTION;
204 /*
205 * The HPTE gets used by compute_tlbie_rb() to set TLBIE bits, so
206 * these functions should work together -- must ensure a guest can not
207 * cause problems with the TLBIE that KVM executes.
208 */
209 if ((pteh >> HPTE_V_SSIZE_SHIFT) & 0x2) {
210 /* B=0b1x is a reserved value, disallow it. */
211 return H_PARAMETER;
212 }
213 psize = kvmppc_actual_pgsz(pteh, ptel);
214 if (!psize)
215 return H_PARAMETER;
216 writing = hpte_is_writable(ptel);
217 pteh &= ~(HPTE_V_HVLOCK | HPTE_V_ABSENT | HPTE_V_VALID);
218 ptel &= ~HPTE_GR_RESERVED;
219 g_ptel = ptel;
220
221 /* used later to detect if we might have been invalidated */
222 mmu_seq = kvm->mmu_invalidate_seq;
223 smp_rmb();
224
225 /* Find the memslot (if any) for this address */
226 gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
227 gfn = gpa >> PAGE_SHIFT;
228 memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
229 pa = 0;
230 is_ci = false;
231 rmap = NULL;
232 if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID))) {
233 /* Emulated MMIO - mark this with key=31 */
234 pteh |= HPTE_V_ABSENT;
235 ptel |= HPTE_R_KEY_HI | HPTE_R_KEY_LO;
236 goto do_insert;
237 }
238
239 /* Check if the requested page fits entirely in the memslot. */
240 if (!slot_is_aligned(memslot, psize))
241 return H_PARAMETER;
242 slot_fn = gfn - memslot->base_gfn;
243 rmap = &memslot->arch.rmap[slot_fn];
244
245 /* Translate to host virtual address */
246 hva = __gfn_to_hva_memslot(memslot, gfn);
247
248 arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock);
249 ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &hpage_shift);
250 if (ptep) {
251 pte_t pte;
252 unsigned int host_pte_size;
253
254 if (hpage_shift)
255 host_pte_size = 1ul << hpage_shift;
256 else
257 host_pte_size = PAGE_SIZE;
258 /*
259 * We should always find the guest page size
260 * to <= host page size, if host is using hugepage
261 */
262 if (host_pte_size < psize) {
263 arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
264 return H_PARAMETER;
265 }
266 pte = kvmppc_read_update_linux_pte(ptep, writing);
267 if (pte_present(pte) && !pte_protnone(pte)) {
268 if (writing && !pte_write(pte))
269 /* make the actual HPTE be read-only */
270 ptel = hpte_make_readonly(ptel);
271 is_ci = pte_ci(pte);
272 pa = pte_pfn(pte) << PAGE_SHIFT;
273 pa |= hva & (host_pte_size - 1);
274 pa |= gpa & ~PAGE_MASK;
275 }
276 }
277 arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
278
279 ptel &= HPTE_R_KEY | HPTE_R_PP0 | (psize-1);
280 ptel |= pa;
281
282 if (pa)
283 pteh |= HPTE_V_VALID;
284 else {
285 pteh |= HPTE_V_ABSENT;
286 ptel &= ~(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
287 }
288
289 /*If we had host pte mapping then Check WIMG */
290 if (ptep && !hpte_cache_flags_ok(ptel, is_ci)) {
291 if (is_ci)
292 return H_PARAMETER;
293 /*
294 * Allow guest to map emulated device memory as
295 * uncacheable, but actually make it cacheable.
296 */
297 ptel &= ~(HPTE_R_W|HPTE_R_I|HPTE_R_G);
298 ptel |= HPTE_R_M;
299 }
300
301 /* Find and lock the HPTEG slot to use */
302 do_insert:
303 if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
304 return H_PARAMETER;
305 if (likely((flags & H_EXACT) == 0)) {
306 pte_index &= ~7UL;
307 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
308 for (i = 0; i < 8; ++i) {
309 if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0 &&
310 try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
311 HPTE_V_ABSENT))
312 break;
313 hpte += 2;
314 }
315 if (i == 8) {
316 /*
317 * Since try_lock_hpte doesn't retry (not even stdcx.
318 * failures), it could be that there is a free slot
319 * but we transiently failed to lock it. Try again,
320 * actually locking each slot and checking it.
321 */
322 hpte -= 16;
323 for (i = 0; i < 8; ++i) {
324 u64 pte;
325 while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
326 cpu_relax();
327 pte = be64_to_cpu(hpte[0]);
328 if (!(pte & (HPTE_V_VALID | HPTE_V_ABSENT)))
329 break;
330 __unlock_hpte(hpte, pte);
331 hpte += 2;
332 }
333 if (i == 8)
334 return H_PTEG_FULL;
335 }
336 pte_index += i;
337 } else {
338 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
339 if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID |
340 HPTE_V_ABSENT)) {
341 /* Lock the slot and check again */
342 u64 pte;
343
344 while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
345 cpu_relax();
346 pte = be64_to_cpu(hpte[0]);
347 if (pte & (HPTE_V_VALID | HPTE_V_ABSENT)) {
348 __unlock_hpte(hpte, pte);
349 return H_PTEG_FULL;
350 }
351 }
352 }
353
354 /* Save away the guest's idea of the second HPTE dword */
355 rev = &kvm->arch.hpt.rev[pte_index];
356 if (realmode)
357 rev = real_vmalloc_addr(rev);
358 if (rev) {
359 rev->guest_rpte = g_ptel;
360 note_hpte_modification(kvm, rev);
361 }
362
363 /* Link HPTE into reverse-map chain */
364 if (pteh & HPTE_V_VALID) {
365 if (realmode)
366 rmap = real_vmalloc_addr(rmap);
367 lock_rmap(rmap);
368 /* Check for pending invalidations under the rmap chain lock */
369 if (mmu_invalidate_retry(kvm, mmu_seq)) {
370 /* inval in progress, write a non-present HPTE */
371 pteh |= HPTE_V_ABSENT;
372 pteh &= ~HPTE_V_VALID;
373 ptel &= ~(HPTE_R_KEY_HI | HPTE_R_KEY_LO);
374 unlock_rmap(rmap);
375 } else {
376 kvmppc_add_revmap_chain(kvm, rev, rmap, pte_index,
377 realmode);
378 /* Only set R/C in real HPTE if already set in *rmap */
379 rcbits = *rmap >> KVMPPC_RMAP_RC_SHIFT;
380 ptel &= rcbits | ~(HPTE_R_R | HPTE_R_C);
381 }
382 }
383
384 /* Convert to new format on P9 */
385 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
386 ptel = hpte_old_to_new_r(pteh, ptel);
387 pteh = hpte_old_to_new_v(pteh);
388 }
389 hpte[1] = cpu_to_be64(ptel);
390
391 /* Write the first HPTE dword, unlocking the HPTE and making it valid */
392 eieio();
393 __unlock_hpte(hpte, pteh);
394 asm volatile("ptesync" : : : "memory");
395
396 *pte_idx_ret = pte_index;
397 return H_SUCCESS;
398 }
399 EXPORT_SYMBOL_GPL(kvmppc_do_h_enter);
400
401 long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
402 long pte_index, unsigned long pteh, unsigned long ptel)
403 {
404 return kvmppc_do_h_enter(vcpu->kvm, flags, pte_index, pteh, ptel,
405 vcpu->arch.pgdir, true,
406 &vcpu->arch.regs.gpr[4]);
407 }
408 EXPORT_SYMBOL_GPL(kvmppc_h_enter);
409
410 #ifdef __BIG_ENDIAN__
411 #define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
412 #else
413 #define LOCK_TOKEN (*(u32 *)(&get_paca()->paca_index))
414 #endif
415
416 static inline int is_mmio_hpte(unsigned long v, unsigned long r)
417 {
418 return ((v & HPTE_V_ABSENT) &&
419 (r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
420 (HPTE_R_KEY_HI | HPTE_R_KEY_LO));
421 }
422
423 static inline void fixup_tlbie_lpid(unsigned long rb_value, unsigned long lpid)
424 {
425
426 if (cpu_has_feature(CPU_FTR_P9_TLBIE_ERAT_BUG)) {
427 /* Radix flush for a hash guest */
428
429 unsigned long rb,rs,prs,r,ric;
430
431 rb = PPC_BIT(52); /* IS = 2 */
432 rs = 0; /* lpid = 0 */
433 prs = 0; /* partition scoped */
434 r = 1; /* radix format */
435 ric = 0; /* RIC_FLSUH_TLB */
436
437 /*
438 * Need the extra ptesync to make sure we don't
439 * re-order the tlbie
440 */
441 asm volatile("ptesync": : :"memory");
442 asm volatile(PPC_TLBIE_5(%0, %4, %3, %2, %1)
443 : : "r"(rb), "i"(r), "i"(prs),
444 "i"(ric), "r"(rs) : "memory");
445 }
446
447 if (cpu_has_feature(CPU_FTR_P9_TLBIE_STQ_BUG)) {
448 asm volatile("ptesync": : :"memory");
449 asm volatile(PPC_TLBIE_5(%0,%1,0,0,0) : :
450 "r" (rb_value), "r" (lpid));
451 }
452 }
453
454 static void do_tlbies(struct kvm *kvm, unsigned long *rbvalues,
455 long npages, int global, bool need_sync)
456 {
457 long i;
458
459 /*
460 * We use the POWER9 5-operand versions of tlbie and tlbiel here.
461 * Since we are using RIC=0 PRS=0 R=0, and P7/P8 tlbiel ignores
462 * the RS field, this is backwards-compatible with P7 and P8.
463 */
464 if (global) {
465 if (need_sync)
466 asm volatile("ptesync" : : : "memory");
467 for (i = 0; i < npages; ++i) {
468 asm volatile(PPC_TLBIE_5(%0,%1,0,0,0) : :
469 "r" (rbvalues[i]), "r" (kvm->arch.lpid));
470 }
471
472 fixup_tlbie_lpid(rbvalues[i - 1], kvm->arch.lpid);
473 asm volatile("eieio; tlbsync; ptesync" : : : "memory");
474 } else {
475 if (need_sync)
476 asm volatile("ptesync" : : : "memory");
477 for (i = 0; i < npages; ++i) {
478 asm volatile(PPC_TLBIEL(%0,%1,0,0,0) : :
479 "r" (rbvalues[i]), "r" (0));
480 }
481 asm volatile("ptesync" : : : "memory");
482 }
483 }
484
485 long kvmppc_do_h_remove(struct kvm *kvm, unsigned long flags,
486 unsigned long pte_index, unsigned long avpn,
487 unsigned long *hpret)
488 {
489 __be64 *hpte;
490 unsigned long v, r, rb;
491 struct revmap_entry *rev;
492 u64 pte, orig_pte, pte_r;
493
494 if (kvm_is_radix(kvm))
495 return H_FUNCTION;
496 if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
497 return H_PARAMETER;
498 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
499 while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
500 cpu_relax();
501 pte = orig_pte = be64_to_cpu(hpte[0]);
502 pte_r = be64_to_cpu(hpte[1]);
503 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
504 pte = hpte_new_to_old_v(pte, pte_r);
505 pte_r = hpte_new_to_old_r(pte_r);
506 }
507 if ((pte & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
508 ((flags & H_AVPN) && (pte & ~0x7fUL) != avpn) ||
509 ((flags & H_ANDCOND) && (pte & avpn) != 0)) {
510 __unlock_hpte(hpte, orig_pte);
511 return H_NOT_FOUND;
512 }
513
514 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
515 v = pte & ~HPTE_V_HVLOCK;
516 if (v & HPTE_V_VALID) {
517 hpte[0] &= ~cpu_to_be64(HPTE_V_VALID);
518 rb = compute_tlbie_rb(v, pte_r, pte_index);
519 do_tlbies(kvm, &rb, 1, global_invalidates(kvm), true);
520 /*
521 * The reference (R) and change (C) bits in a HPT
522 * entry can be set by hardware at any time up until
523 * the HPTE is invalidated and the TLB invalidation
524 * sequence has completed. This means that when
525 * removing a HPTE, we need to re-read the HPTE after
526 * the invalidation sequence has completed in order to
527 * obtain reliable values of R and C.
528 */
529 remove_revmap_chain(kvm, pte_index, rev, v,
530 be64_to_cpu(hpte[1]));
531 }
532 r = rev->guest_rpte & ~HPTE_GR_RESERVED;
533 note_hpte_modification(kvm, rev);
534 unlock_hpte(hpte, 0);
535
536 if (is_mmio_hpte(v, pte_r))
537 atomic64_inc(&kvm->arch.mmio_update);
538
539 if (v & HPTE_V_ABSENT)
540 v = (v & ~HPTE_V_ABSENT) | HPTE_V_VALID;
541 hpret[0] = v;
542 hpret[1] = r;
543 return H_SUCCESS;
544 }
545 EXPORT_SYMBOL_GPL(kvmppc_do_h_remove);
546
547 long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
548 unsigned long pte_index, unsigned long avpn)
549 {
550 return kvmppc_do_h_remove(vcpu->kvm, flags, pte_index, avpn,
551 &vcpu->arch.regs.gpr[4]);
552 }
553 EXPORT_SYMBOL_GPL(kvmppc_h_remove);
554
555 long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
556 {
557 struct kvm *kvm = vcpu->kvm;
558 unsigned long *args = &vcpu->arch.regs.gpr[4];
559 __be64 *hp, *hptes[4];
560 unsigned long tlbrb[4];
561 long int i, j, k, n, found, indexes[4];
562 unsigned long flags, req, pte_index, rcbits;
563 int global;
564 long int ret = H_SUCCESS;
565 struct revmap_entry *rev, *revs[4];
566 u64 hp0, hp1;
567
568 if (kvm_is_radix(kvm))
569 return H_FUNCTION;
570 global = global_invalidates(kvm);
571 for (i = 0; i < 4 && ret == H_SUCCESS; ) {
572 n = 0;
573 for (; i < 4; ++i) {
574 j = i * 2;
575 pte_index = args[j];
576 flags = pte_index >> 56;
577 pte_index &= ((1ul << 56) - 1);
578 req = flags >> 6;
579 flags &= 3;
580 if (req == 3) { /* no more requests */
581 i = 4;
582 break;
583 }
584 if (req != 1 || flags == 3 ||
585 pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt)) {
586 /* parameter error */
587 args[j] = ((0xa0 | flags) << 56) + pte_index;
588 ret = H_PARAMETER;
589 break;
590 }
591 hp = (__be64 *) (kvm->arch.hpt.virt + (pte_index << 4));
592 /* to avoid deadlock, don't spin except for first */
593 if (!try_lock_hpte(hp, HPTE_V_HVLOCK)) {
594 if (n)
595 break;
596 while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
597 cpu_relax();
598 }
599 found = 0;
600 hp0 = be64_to_cpu(hp[0]);
601 hp1 = be64_to_cpu(hp[1]);
602 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
603 hp0 = hpte_new_to_old_v(hp0, hp1);
604 hp1 = hpte_new_to_old_r(hp1);
605 }
606 if (hp0 & (HPTE_V_ABSENT | HPTE_V_VALID)) {
607 switch (flags & 3) {
608 case 0: /* absolute */
609 found = 1;
610 break;
611 case 1: /* andcond */
612 if (!(hp0 & args[j + 1]))
613 found = 1;
614 break;
615 case 2: /* AVPN */
616 if ((hp0 & ~0x7fUL) == args[j + 1])
617 found = 1;
618 break;
619 }
620 }
621 if (!found) {
622 hp[0] &= ~cpu_to_be64(HPTE_V_HVLOCK);
623 args[j] = ((0x90 | flags) << 56) + pte_index;
624 continue;
625 }
626
627 args[j] = ((0x80 | flags) << 56) + pte_index;
628 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
629 note_hpte_modification(kvm, rev);
630
631 if (!(hp0 & HPTE_V_VALID)) {
632 /* insert R and C bits from PTE */
633 rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
634 args[j] |= rcbits << (56 - 5);
635 hp[0] = 0;
636 if (is_mmio_hpte(hp0, hp1))
637 atomic64_inc(&kvm->arch.mmio_update);
638 continue;
639 }
640
641 /* leave it locked */
642 hp[0] &= ~cpu_to_be64(HPTE_V_VALID);
643 tlbrb[n] = compute_tlbie_rb(hp0, hp1, pte_index);
644 indexes[n] = j;
645 hptes[n] = hp;
646 revs[n] = rev;
647 ++n;
648 }
649
650 if (!n)
651 break;
652
653 /* Now that we've collected a batch, do the tlbies */
654 do_tlbies(kvm, tlbrb, n, global, true);
655
656 /* Read PTE low words after tlbie to get final R/C values */
657 for (k = 0; k < n; ++k) {
658 j = indexes[k];
659 pte_index = args[j] & ((1ul << 56) - 1);
660 hp = hptes[k];
661 rev = revs[k];
662 remove_revmap_chain(kvm, pte_index, rev,
663 be64_to_cpu(hp[0]), be64_to_cpu(hp[1]));
664 rcbits = rev->guest_rpte & (HPTE_R_R|HPTE_R_C);
665 args[j] |= rcbits << (56 - 5);
666 __unlock_hpte(hp, 0);
667 }
668 }
669
670 return ret;
671 }
672 EXPORT_SYMBOL_GPL(kvmppc_h_bulk_remove);
673
674 long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
675 unsigned long pte_index, unsigned long avpn)
676 {
677 struct kvm *kvm = vcpu->kvm;
678 __be64 *hpte;
679 struct revmap_entry *rev;
680 unsigned long v, r, rb, mask, bits;
681 u64 pte_v, pte_r;
682
683 if (kvm_is_radix(kvm))
684 return H_FUNCTION;
685 if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
686 return H_PARAMETER;
687
688 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
689 while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
690 cpu_relax();
691 v = pte_v = be64_to_cpu(hpte[0]);
692 if (cpu_has_feature(CPU_FTR_ARCH_300))
693 v = hpte_new_to_old_v(v, be64_to_cpu(hpte[1]));
694 if ((v & (HPTE_V_ABSENT | HPTE_V_VALID)) == 0 ||
695 ((flags & H_AVPN) && (v & ~0x7fUL) != avpn)) {
696 __unlock_hpte(hpte, pte_v);
697 return H_NOT_FOUND;
698 }
699
700 pte_r = be64_to_cpu(hpte[1]);
701 bits = (flags << 55) & HPTE_R_PP0;
702 bits |= (flags << 48) & HPTE_R_KEY_HI;
703 bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
704
705 /* Update guest view of 2nd HPTE dword */
706 mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
707 HPTE_R_KEY_HI | HPTE_R_KEY_LO;
708 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
709 if (rev) {
710 r = (rev->guest_rpte & ~mask) | bits;
711 rev->guest_rpte = r;
712 note_hpte_modification(kvm, rev);
713 }
714
715 /* Update HPTE */
716 if (v & HPTE_V_VALID) {
717 /*
718 * If the page is valid, don't let it transition from
719 * readonly to writable. If it should be writable, we'll
720 * take a trap and let the page fault code sort it out.
721 */
722 r = (pte_r & ~mask) | bits;
723 if (hpte_is_writable(r) && !hpte_is_writable(pte_r))
724 r = hpte_make_readonly(r);
725 /* If the PTE is changing, invalidate it first */
726 if (r != pte_r) {
727 rb = compute_tlbie_rb(v, r, pte_index);
728 hpte[0] = cpu_to_be64((pte_v & ~HPTE_V_VALID) |
729 HPTE_V_ABSENT);
730 do_tlbies(kvm, &rb, 1, global_invalidates(kvm), true);
731 /* Don't lose R/C bit updates done by hardware */
732 r |= be64_to_cpu(hpte[1]) & (HPTE_R_R | HPTE_R_C);
733 hpte[1] = cpu_to_be64(r);
734 }
735 }
736 unlock_hpte(hpte, pte_v & ~HPTE_V_HVLOCK);
737 asm volatile("ptesync" : : : "memory");
738 if (is_mmio_hpte(v, pte_r))
739 atomic64_inc(&kvm->arch.mmio_update);
740
741 return H_SUCCESS;
742 }
743 EXPORT_SYMBOL_GPL(kvmppc_h_protect);
744
745 long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
746 unsigned long pte_index)
747 {
748 struct kvm *kvm = vcpu->kvm;
749 __be64 *hpte;
750 unsigned long v, r;
751 int i, n = 1;
752 struct revmap_entry *rev = NULL;
753
754 if (kvm_is_radix(kvm))
755 return H_FUNCTION;
756 if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
757 return H_PARAMETER;
758 if (flags & H_READ_4) {
759 pte_index &= ~3;
760 n = 4;
761 }
762 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
763 for (i = 0; i < n; ++i, ++pte_index) {
764 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
765 v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
766 r = be64_to_cpu(hpte[1]);
767 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
768 v = hpte_new_to_old_v(v, r);
769 r = hpte_new_to_old_r(r);
770 }
771 if (v & HPTE_V_ABSENT) {
772 v &= ~HPTE_V_ABSENT;
773 v |= HPTE_V_VALID;
774 }
775 if (v & HPTE_V_VALID) {
776 r = rev[i].guest_rpte | (r & (HPTE_R_R | HPTE_R_C));
777 r &= ~HPTE_GR_RESERVED;
778 }
779 kvmppc_set_gpr(vcpu, 4 + i * 2, v);
780 kvmppc_set_gpr(vcpu, 5 + i * 2, r);
781 }
782 return H_SUCCESS;
783 }
784 EXPORT_SYMBOL_GPL(kvmppc_h_read);
785
786 long kvmppc_h_clear_ref(struct kvm_vcpu *vcpu, unsigned long flags,
787 unsigned long pte_index)
788 {
789 struct kvm *kvm = vcpu->kvm;
790 __be64 *hpte;
791 unsigned long v, r, gr;
792 struct revmap_entry *rev;
793 unsigned long *rmap;
794 long ret = H_NOT_FOUND;
795
796 if (kvm_is_radix(kvm))
797 return H_FUNCTION;
798 if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
799 return H_PARAMETER;
800
801 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
802 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
803 while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
804 cpu_relax();
805 v = be64_to_cpu(hpte[0]);
806 r = be64_to_cpu(hpte[1]);
807 if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
808 goto out;
809
810 gr = rev->guest_rpte;
811 if (rev->guest_rpte & HPTE_R_R) {
812 rev->guest_rpte &= ~HPTE_R_R;
813 note_hpte_modification(kvm, rev);
814 }
815 if (v & HPTE_V_VALID) {
816 gr |= r & (HPTE_R_R | HPTE_R_C);
817 if (r & HPTE_R_R) {
818 kvmppc_clear_ref_hpte(kvm, hpte, pte_index);
819 rmap = revmap_for_hpte(kvm, v, gr, NULL, NULL);
820 if (rmap) {
821 lock_rmap(rmap);
822 *rmap |= KVMPPC_RMAP_REFERENCED;
823 unlock_rmap(rmap);
824 }
825 }
826 }
827 kvmppc_set_gpr(vcpu, 4, gr);
828 ret = H_SUCCESS;
829 out:
830 unlock_hpte(hpte, v & ~HPTE_V_HVLOCK);
831 return ret;
832 }
833 EXPORT_SYMBOL_GPL(kvmppc_h_clear_ref);
834
835 long kvmppc_h_clear_mod(struct kvm_vcpu *vcpu, unsigned long flags,
836 unsigned long pte_index)
837 {
838 struct kvm *kvm = vcpu->kvm;
839 __be64 *hpte;
840 unsigned long v, r, gr;
841 struct revmap_entry *rev;
842 long ret = H_NOT_FOUND;
843
844 if (kvm_is_radix(kvm))
845 return H_FUNCTION;
846 if (pte_index >= kvmppc_hpt_npte(&kvm->arch.hpt))
847 return H_PARAMETER;
848
849 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[pte_index]);
850 hpte = (__be64 *)(kvm->arch.hpt.virt + (pte_index << 4));
851 while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
852 cpu_relax();
853 v = be64_to_cpu(hpte[0]);
854 r = be64_to_cpu(hpte[1]);
855 if (!(v & (HPTE_V_VALID | HPTE_V_ABSENT)))
856 goto out;
857
858 gr = rev->guest_rpte;
859 if (gr & HPTE_R_C) {
860 rev->guest_rpte &= ~HPTE_R_C;
861 note_hpte_modification(kvm, rev);
862 }
863 if (v & HPTE_V_VALID) {
864 /* need to make it temporarily absent so C is stable */
865 hpte[0] |= cpu_to_be64(HPTE_V_ABSENT);
866 kvmppc_invalidate_hpte(kvm, hpte, pte_index);
867 r = be64_to_cpu(hpte[1]);
868 gr |= r & (HPTE_R_R | HPTE_R_C);
869 if (r & HPTE_R_C) {
870 hpte[1] = cpu_to_be64(r & ~HPTE_R_C);
871 eieio();
872 kvmppc_set_dirty_from_hpte(kvm, v, gr);
873 }
874 }
875 kvmppc_set_gpr(vcpu, 4, gr);
876 ret = H_SUCCESS;
877 out:
878 unlock_hpte(hpte, v & ~HPTE_V_HVLOCK);
879 return ret;
880 }
881 EXPORT_SYMBOL_GPL(kvmppc_h_clear_mod);
882
883 static int kvmppc_get_hpa(struct kvm_vcpu *vcpu, unsigned long mmu_seq,
884 unsigned long gpa, int writing, unsigned long *hpa,
885 struct kvm_memory_slot **memslot_p)
886 {
887 struct kvm *kvm = vcpu->kvm;
888 struct kvm_memory_slot *memslot;
889 unsigned long gfn, hva, pa, psize = PAGE_SHIFT;
890 unsigned int shift;
891 pte_t *ptep, pte;
892
893 /* Find the memslot for this address */
894 gfn = gpa >> PAGE_SHIFT;
895 memslot = __gfn_to_memslot(kvm_memslots_raw(kvm), gfn);
896 if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
897 return H_PARAMETER;
898
899 /* Translate to host virtual address */
900 hva = __gfn_to_hva_memslot(memslot, gfn);
901
902 /* Try to find the host pte for that virtual address */
903 ptep = find_kvm_host_pte(kvm, mmu_seq, hva, &shift);
904 if (!ptep)
905 return H_TOO_HARD;
906 pte = kvmppc_read_update_linux_pte(ptep, writing);
907 if (!pte_present(pte))
908 return H_TOO_HARD;
909
910 /* Convert to a physical address */
911 if (shift)
912 psize = 1UL << shift;
913 pa = pte_pfn(pte) << PAGE_SHIFT;
914 pa |= hva & (psize - 1);
915 pa |= gpa & ~PAGE_MASK;
916
917 if (hpa)
918 *hpa = pa;
919 if (memslot_p)
920 *memslot_p = memslot;
921
922 return H_SUCCESS;
923 }
924
925 static long kvmppc_do_h_page_init_zero(struct kvm_vcpu *vcpu,
926 unsigned long dest)
927 {
928 struct kvm_memory_slot *memslot;
929 struct kvm *kvm = vcpu->kvm;
930 unsigned long pa, mmu_seq;
931 long ret = H_SUCCESS;
932 int i;
933
934 /* Used later to detect if we might have been invalidated */
935 mmu_seq = kvm->mmu_invalidate_seq;
936 smp_rmb();
937
938 arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock);
939
940 ret = kvmppc_get_hpa(vcpu, mmu_seq, dest, 1, &pa, &memslot);
941 if (ret != H_SUCCESS)
942 goto out_unlock;
943
944 /* Zero the page */
945 for (i = 0; i < SZ_4K; i += L1_CACHE_BYTES, pa += L1_CACHE_BYTES)
946 dcbz((void *)pa);
947 kvmppc_update_dirty_map(memslot, dest >> PAGE_SHIFT, PAGE_SIZE);
948
949 out_unlock:
950 arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
951 return ret;
952 }
953
954 static long kvmppc_do_h_page_init_copy(struct kvm_vcpu *vcpu,
955 unsigned long dest, unsigned long src)
956 {
957 unsigned long dest_pa, src_pa, mmu_seq;
958 struct kvm_memory_slot *dest_memslot;
959 struct kvm *kvm = vcpu->kvm;
960 long ret = H_SUCCESS;
961
962 /* Used later to detect if we might have been invalidated */
963 mmu_seq = kvm->mmu_invalidate_seq;
964 smp_rmb();
965
966 arch_spin_lock(&kvm->mmu_lock.rlock.raw_lock);
967 ret = kvmppc_get_hpa(vcpu, mmu_seq, dest, 1, &dest_pa, &dest_memslot);
968 if (ret != H_SUCCESS)
969 goto out_unlock;
970
971 ret = kvmppc_get_hpa(vcpu, mmu_seq, src, 0, &src_pa, NULL);
972 if (ret != H_SUCCESS)
973 goto out_unlock;
974
975 /* Copy the page */
976 memcpy((void *)dest_pa, (void *)src_pa, SZ_4K);
977
978 kvmppc_update_dirty_map(dest_memslot, dest >> PAGE_SHIFT, PAGE_SIZE);
979
980 out_unlock:
981 arch_spin_unlock(&kvm->mmu_lock.rlock.raw_lock);
982 return ret;
983 }
984
985 long kvmppc_rm_h_page_init(struct kvm_vcpu *vcpu, unsigned long flags,
986 unsigned long dest, unsigned long src)
987 {
988 struct kvm *kvm = vcpu->kvm;
989 u64 pg_mask = SZ_4K - 1; /* 4K page size */
990 long ret = H_SUCCESS;
991
992 /* Don't handle radix mode here, go up to the virtual mode handler */
993 if (kvm_is_radix(kvm))
994 return H_TOO_HARD;
995
996 /* Check for invalid flags (H_PAGE_SET_LOANED covers all CMO flags) */
997 if (flags & ~(H_ICACHE_INVALIDATE | H_ICACHE_SYNCHRONIZE |
998 H_ZERO_PAGE | H_COPY_PAGE | H_PAGE_SET_LOANED))
999 return H_PARAMETER;
1000
1001 /* dest (and src if copy_page flag set) must be page aligned */
1002 if ((dest & pg_mask) || ((flags & H_COPY_PAGE) && (src & pg_mask)))
1003 return H_PARAMETER;
1004
1005 /* zero and/or copy the page as determined by the flags */
1006 if (flags & H_COPY_PAGE)
1007 ret = kvmppc_do_h_page_init_copy(vcpu, dest, src);
1008 else if (flags & H_ZERO_PAGE)
1009 ret = kvmppc_do_h_page_init_zero(vcpu, dest);
1010
1011 /* We can ignore the other flags */
1012
1013 return ret;
1014 }
1015
1016 void kvmppc_invalidate_hpte(struct kvm *kvm, __be64 *hptep,
1017 unsigned long pte_index)
1018 {
1019 unsigned long rb;
1020 u64 hp0, hp1;
1021
1022 hptep[0] &= ~cpu_to_be64(HPTE_V_VALID);
1023 hp0 = be64_to_cpu(hptep[0]);
1024 hp1 = be64_to_cpu(hptep[1]);
1025 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1026 hp0 = hpte_new_to_old_v(hp0, hp1);
1027 hp1 = hpte_new_to_old_r(hp1);
1028 }
1029 rb = compute_tlbie_rb(hp0, hp1, pte_index);
1030 do_tlbies(kvm, &rb, 1, 1, true);
1031 }
1032 EXPORT_SYMBOL_GPL(kvmppc_invalidate_hpte);
1033
1034 void kvmppc_clear_ref_hpte(struct kvm *kvm, __be64 *hptep,
1035 unsigned long pte_index)
1036 {
1037 unsigned long rb;
1038 unsigned char rbyte;
1039 u64 hp0, hp1;
1040
1041 hp0 = be64_to_cpu(hptep[0]);
1042 hp1 = be64_to_cpu(hptep[1]);
1043 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1044 hp0 = hpte_new_to_old_v(hp0, hp1);
1045 hp1 = hpte_new_to_old_r(hp1);
1046 }
1047 rb = compute_tlbie_rb(hp0, hp1, pte_index);
1048 rbyte = (be64_to_cpu(hptep[1]) & ~HPTE_R_R) >> 8;
1049 /* modify only the second-last byte, which contains the ref bit */
1050 *((char *)hptep + 14) = rbyte;
1051 do_tlbies(kvm, &rb, 1, 1, false);
1052 }
1053 EXPORT_SYMBOL_GPL(kvmppc_clear_ref_hpte);
1054
1055 static int slb_base_page_shift[4] = {
1056 24, /* 16M */
1057 16, /* 64k */
1058 34, /* 16G */
1059 20, /* 1M, unsupported */
1060 };
1061
1062 static struct mmio_hpte_cache_entry *mmio_cache_search(struct kvm_vcpu *vcpu,
1063 unsigned long eaddr, unsigned long slb_v, long mmio_update)
1064 {
1065 struct mmio_hpte_cache_entry *entry = NULL;
1066 unsigned int pshift;
1067 unsigned int i;
1068
1069 for (i = 0; i < MMIO_HPTE_CACHE_SIZE; i++) {
1070 entry = &vcpu->arch.mmio_cache.entry[i];
1071 if (entry->mmio_update == mmio_update) {
1072 pshift = entry->slb_base_pshift;
1073 if ((entry->eaddr >> pshift) == (eaddr >> pshift) &&
1074 entry->slb_v == slb_v)
1075 return entry;
1076 }
1077 }
1078 return NULL;
1079 }
1080
1081 static struct mmio_hpte_cache_entry *
1082 next_mmio_cache_entry(struct kvm_vcpu *vcpu)
1083 {
1084 unsigned int index = vcpu->arch.mmio_cache.index;
1085
1086 vcpu->arch.mmio_cache.index++;
1087 if (vcpu->arch.mmio_cache.index == MMIO_HPTE_CACHE_SIZE)
1088 vcpu->arch.mmio_cache.index = 0;
1089
1090 return &vcpu->arch.mmio_cache.entry[index];
1091 }
1092
1093 /* When called from virtmode, this func should be protected by
1094 * preempt_disable(), otherwise, the holding of HPTE_V_HVLOCK
1095 * can trigger deadlock issue.
1096 */
1097 long kvmppc_hv_find_lock_hpte(struct kvm *kvm, gva_t eaddr, unsigned long slb_v,
1098 unsigned long valid)
1099 {
1100 unsigned int i;
1101 unsigned int pshift;
1102 unsigned long somask;
1103 unsigned long vsid, hash;
1104 unsigned long avpn;
1105 __be64 *hpte;
1106 unsigned long mask, val;
1107 unsigned long v, r, orig_v;
1108
1109 /* Get page shift, work out hash and AVPN etc. */
1110 mask = SLB_VSID_B | HPTE_V_AVPN | HPTE_V_SECONDARY;
1111 val = 0;
1112 pshift = 12;
1113 if (slb_v & SLB_VSID_L) {
1114 mask |= HPTE_V_LARGE;
1115 val |= HPTE_V_LARGE;
1116 pshift = slb_base_page_shift[(slb_v & SLB_VSID_LP) >> 4];
1117 }
1118 if (slb_v & SLB_VSID_B_1T) {
1119 somask = (1UL << 40) - 1;
1120 vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T;
1121 vsid ^= vsid << 25;
1122 } else {
1123 somask = (1UL << 28) - 1;
1124 vsid = (slb_v & ~SLB_VSID_B) >> SLB_VSID_SHIFT;
1125 }
1126 hash = (vsid ^ ((eaddr & somask) >> pshift)) & kvmppc_hpt_mask(&kvm->arch.hpt);
1127 avpn = slb_v & ~(somask >> 16); /* also includes B */
1128 avpn |= (eaddr & somask) >> 16;
1129
1130 if (pshift >= 24)
1131 avpn &= ~((1UL << (pshift - 16)) - 1);
1132 else
1133 avpn &= ~0x7fUL;
1134 val |= avpn;
1135
1136 for (;;) {
1137 hpte = (__be64 *)(kvm->arch.hpt.virt + (hash << 7));
1138
1139 for (i = 0; i < 16; i += 2) {
1140 /* Read the PTE racily */
1141 v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK;
1142 if (cpu_has_feature(CPU_FTR_ARCH_300))
1143 v = hpte_new_to_old_v(v, be64_to_cpu(hpte[i+1]));
1144
1145 /* Check valid/absent, hash, segment size and AVPN */
1146 if (!(v & valid) || (v & mask) != val)
1147 continue;
1148
1149 /* Lock the PTE and read it under the lock */
1150 while (!try_lock_hpte(&hpte[i], HPTE_V_HVLOCK))
1151 cpu_relax();
1152 v = orig_v = be64_to_cpu(hpte[i]) & ~HPTE_V_HVLOCK;
1153 r = be64_to_cpu(hpte[i+1]);
1154 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1155 v = hpte_new_to_old_v(v, r);
1156 r = hpte_new_to_old_r(r);
1157 }
1158
1159 /*
1160 * Check the HPTE again, including base page size
1161 */
1162 if ((v & valid) && (v & mask) == val &&
1163 kvmppc_hpte_base_page_shift(v, r) == pshift)
1164 /* Return with the HPTE still locked */
1165 return (hash << 3) + (i >> 1);
1166
1167 __unlock_hpte(&hpte[i], orig_v);
1168 }
1169
1170 if (val & HPTE_V_SECONDARY)
1171 break;
1172 val |= HPTE_V_SECONDARY;
1173 hash = hash ^ kvmppc_hpt_mask(&kvm->arch.hpt);
1174 }
1175 return -1;
1176 }
1177 EXPORT_SYMBOL(kvmppc_hv_find_lock_hpte);
1178
1179 /*
1180 * Called in real mode to check whether an HPTE not found fault
1181 * is due to accessing a paged-out page or an emulated MMIO page,
1182 * or if a protection fault is due to accessing a page that the
1183 * guest wanted read/write access to but which we made read-only.
1184 * Returns a possibly modified status (DSISR) value if not
1185 * (i.e. pass the interrupt to the guest),
1186 * -1 to pass the fault up to host kernel mode code, -2 to do that
1187 * and also load the instruction word (for MMIO emulation),
1188 * or 0 if we should make the guest retry the access.
1189 */
1190 long kvmppc_hpte_hv_fault(struct kvm_vcpu *vcpu, unsigned long addr,
1191 unsigned long slb_v, unsigned int status, bool data)
1192 {
1193 struct kvm *kvm = vcpu->kvm;
1194 long int index;
1195 unsigned long v, r, gr, orig_v;
1196 __be64 *hpte;
1197 unsigned long valid;
1198 struct revmap_entry *rev;
1199 unsigned long pp, key;
1200 struct mmio_hpte_cache_entry *cache_entry = NULL;
1201 long mmio_update = 0;
1202
1203 /* For protection fault, expect to find a valid HPTE */
1204 valid = HPTE_V_VALID;
1205 if (status & DSISR_NOHPTE) {
1206 valid |= HPTE_V_ABSENT;
1207 mmio_update = atomic64_read(&kvm->arch.mmio_update);
1208 cache_entry = mmio_cache_search(vcpu, addr, slb_v, mmio_update);
1209 }
1210 if (cache_entry) {
1211 index = cache_entry->pte_index;
1212 v = cache_entry->hpte_v;
1213 r = cache_entry->hpte_r;
1214 gr = cache_entry->rpte;
1215 } else {
1216 index = kvmppc_hv_find_lock_hpte(kvm, addr, slb_v, valid);
1217 if (index < 0) {
1218 if (status & DSISR_NOHPTE)
1219 return status; /* there really was no HPTE */
1220 return 0; /* for prot fault, HPTE disappeared */
1221 }
1222 hpte = (__be64 *)(kvm->arch.hpt.virt + (index << 4));
1223 v = orig_v = be64_to_cpu(hpte[0]) & ~HPTE_V_HVLOCK;
1224 r = be64_to_cpu(hpte[1]);
1225 if (cpu_has_feature(CPU_FTR_ARCH_300)) {
1226 v = hpte_new_to_old_v(v, r);
1227 r = hpte_new_to_old_r(r);
1228 }
1229 rev = real_vmalloc_addr(&kvm->arch.hpt.rev[index]);
1230 gr = rev->guest_rpte;
1231
1232 unlock_hpte(hpte, orig_v);
1233 }
1234
1235 /* For not found, if the HPTE is valid by now, retry the instruction */
1236 if ((status & DSISR_NOHPTE) && (v & HPTE_V_VALID))
1237 return 0;
1238
1239 /* Check access permissions to the page */
1240 pp = gr & (HPTE_R_PP0 | HPTE_R_PP);
1241 key = (vcpu->arch.shregs.msr & MSR_PR) ? SLB_VSID_KP : SLB_VSID_KS;
1242 status &= ~DSISR_NOHPTE; /* DSISR_NOHPTE == SRR1_ISI_NOPT */
1243 if (!data) {
1244 if (gr & (HPTE_R_N | HPTE_R_G))
1245 return status | SRR1_ISI_N_G_OR_CIP;
1246 if (!hpte_read_permission(pp, slb_v & key))
1247 return status | SRR1_ISI_PROT;
1248 } else if (status & DSISR_ISSTORE) {
1249 /* check write permission */
1250 if (!hpte_write_permission(pp, slb_v & key))
1251 return status | DSISR_PROTFAULT;
1252 } else {
1253 if (!hpte_read_permission(pp, slb_v & key))
1254 return status | DSISR_PROTFAULT;
1255 }
1256
1257 /* Check storage key, if applicable */
1258 if (data && (vcpu->arch.shregs.msr & MSR_DR)) {
1259 unsigned int perm = hpte_get_skey_perm(gr, vcpu->arch.amr);
1260 if (status & DSISR_ISSTORE)
1261 perm >>= 1;
1262 if (perm & 1)
1263 return status | DSISR_KEYFAULT;
1264 }
1265
1266 /* Save HPTE info for virtual-mode handler */
1267 vcpu->arch.pgfault_addr = addr;
1268 vcpu->arch.pgfault_index = index;
1269 vcpu->arch.pgfault_hpte[0] = v;
1270 vcpu->arch.pgfault_hpte[1] = r;
1271 vcpu->arch.pgfault_cache = cache_entry;
1272
1273 /* Check the storage key to see if it is possibly emulated MMIO */
1274 if ((r & (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) ==
1275 (HPTE_R_KEY_HI | HPTE_R_KEY_LO)) {
1276 if (!cache_entry) {
1277 unsigned int pshift = 12;
1278 unsigned int pshift_index;
1279
1280 if (slb_v & SLB_VSID_L) {
1281 pshift_index = ((slb_v & SLB_VSID_LP) >> 4);
1282 pshift = slb_base_page_shift[pshift_index];
1283 }
1284 cache_entry = next_mmio_cache_entry(vcpu);
1285 cache_entry->eaddr = addr;
1286 cache_entry->slb_base_pshift = pshift;
1287 cache_entry->pte_index = index;
1288 cache_entry->hpte_v = v;
1289 cache_entry->hpte_r = r;
1290 cache_entry->rpte = gr;
1291 cache_entry->slb_v = slb_v;
1292 cache_entry->mmio_update = mmio_update;
1293 }
1294 if (data && (vcpu->arch.shregs.msr & MSR_IR))
1295 return -2; /* MMIO emulation - load instr word */
1296 }
1297
1298 return -1; /* send fault up to host kernel mode */
1299 }
1300 EXPORT_SYMBOL_GPL(kvmppc_hpte_hv_fault);
1301
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