1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 *
4 * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
5 * Copyright 2011 David Gibson, IBM Corporation <dwg@au1.ibm.com>
6 * Copyright 2016 Alexey Kardashevskiy, IBM Corporation <aik@au1.ibm.com>
7 */
8
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/kvm.h>
12 #include <linux/kvm_host.h>
13 #include <linux/highmem.h>
14 #include <linux/gfp.h>
15 #include <linux/slab.h>
16 #include <linux/hugetlb.h>
17 #include <linux/list.h>
18 #include <linux/stringify.h>
19
20 #include <asm/kvm_ppc.h>
21 #include <asm/kvm_book3s.h>
22 #include <asm/book3s/64/mmu-hash.h>
23 #include <asm/mmu_context.h>
24 #include <asm/hvcall.h>
25 #include <asm/synch.h>
26 #include <asm/ppc-opcode.h>
27 #include <asm/kvm_host.h>
28 #include <asm/udbg.h>
29 #include <asm/iommu.h>
30 #include <asm/tce.h>
31 #include <asm/pte-walk.h>
32
33 #ifdef CONFIG_BUG
34
35 #define WARN_ON_ONCE_RM(condition) ({ \
36 static bool __section(.data.unlikely) __warned; \
37 int __ret_warn_once = !!(condition); \
38 \
39 if (unlikely(__ret_warn_once && !__warned)) { \
40 __warned = true; \
41 pr_err("WARN_ON_ONCE_RM: (%s) at %s:%u\n", \
42 __stringify(condition), \
43 __func__, __LINE__); \
44 dump_stack(); \
45 } \
46 unlikely(__ret_warn_once); \
47 })
48
49 #else
50
51 #define WARN_ON_ONCE_RM(condition) ({ \
52 int __ret_warn_on = !!(condition); \
53 unlikely(__ret_warn_on); \
54 })
55
56 #endif
57
58 /*
59 * Finds a TCE table descriptor by LIOBN.
60 *
61 * WARNING: This will be called in real or virtual mode on HV KVM and virtual
62 * mode on PR KVM
63 */
kvmppc_find_table(struct kvm * kvm,unsigned long liobn)64 struct kvmppc_spapr_tce_table *kvmppc_find_table(struct kvm *kvm,
65 unsigned long liobn)
66 {
67 struct kvmppc_spapr_tce_table *stt;
68
69 list_for_each_entry_lockless(stt, &kvm->arch.spapr_tce_tables, list)
70 if (stt->liobn == liobn)
71 return stt;
72
73 return NULL;
74 }
75 EXPORT_SYMBOL_GPL(kvmppc_find_table);
76
77 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
kvmppc_rm_tce_to_ua(struct kvm * kvm,unsigned long tce,unsigned long * ua,unsigned long ** prmap)78 static long kvmppc_rm_tce_to_ua(struct kvm *kvm, unsigned long tce,
79 unsigned long *ua, unsigned long **prmap)
80 {
81 unsigned long gfn = tce >> PAGE_SHIFT;
82 struct kvm_memory_slot *memslot;
83
84 memslot = search_memslots(kvm_memslots_raw(kvm), gfn);
85 if (!memslot)
86 return -EINVAL;
87
88 *ua = __gfn_to_hva_memslot(memslot, gfn) |
89 (tce & ~(PAGE_MASK | TCE_PCI_READ | TCE_PCI_WRITE));
90
91 if (prmap)
92 *prmap = &memslot->arch.rmap[gfn - memslot->base_gfn];
93
94 return 0;
95 }
96
97 /*
98 * Validates TCE address.
99 * At the moment flags and page mask are validated.
100 * As the host kernel does not access those addresses (just puts them
101 * to the table and user space is supposed to process them), we can skip
102 * checking other things (such as TCE is a guest RAM address or the page
103 * was actually allocated).
104 */
kvmppc_rm_tce_validate(struct kvmppc_spapr_tce_table * stt,unsigned long tce)105 static long kvmppc_rm_tce_validate(struct kvmppc_spapr_tce_table *stt,
106 unsigned long tce)
107 {
108 unsigned long gpa = tce & ~(TCE_PCI_READ | TCE_PCI_WRITE);
109 enum dma_data_direction dir = iommu_tce_direction(tce);
110 struct kvmppc_spapr_tce_iommu_table *stit;
111 unsigned long ua = 0;
112
113 /* Allow userspace to poison TCE table */
114 if (dir == DMA_NONE)
115 return H_SUCCESS;
116
117 if (iommu_tce_check_gpa(stt->page_shift, gpa))
118 return H_PARAMETER;
119
120 if (kvmppc_rm_tce_to_ua(stt->kvm, tce, &ua, NULL))
121 return H_TOO_HARD;
122
123 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
124 unsigned long hpa = 0;
125 struct mm_iommu_table_group_mem_t *mem;
126 long shift = stit->tbl->it_page_shift;
127
128 mem = mm_iommu_lookup_rm(stt->kvm->mm, ua, 1ULL << shift);
129 if (!mem)
130 return H_TOO_HARD;
131
132 if (mm_iommu_ua_to_hpa_rm(mem, ua, shift, &hpa))
133 return H_TOO_HARD;
134 }
135
136 return H_SUCCESS;
137 }
138
139 /* Note on the use of page_address() in real mode,
140 *
141 * It is safe to use page_address() in real mode on ppc64 because
142 * page_address() is always defined as lowmem_page_address()
143 * which returns __va(PFN_PHYS(page_to_pfn(page))) which is arithmetic
144 * operation and does not access page struct.
145 *
146 * Theoretically page_address() could be defined different
147 * but either WANT_PAGE_VIRTUAL or HASHED_PAGE_VIRTUAL
148 * would have to be enabled.
149 * WANT_PAGE_VIRTUAL is never enabled on ppc32/ppc64,
150 * HASHED_PAGE_VIRTUAL could be enabled for ppc32 only and only
151 * if CONFIG_HIGHMEM is defined. As CONFIG_SPARSEMEM_VMEMMAP
152 * is not expected to be enabled on ppc32, page_address()
153 * is safe for ppc32 as well.
154 *
155 * WARNING: This will be called in real-mode on HV KVM and virtual
156 * mode on PR KVM
157 */
kvmppc_page_address(struct page * page)158 static u64 *kvmppc_page_address(struct page *page)
159 {
160 #if defined(HASHED_PAGE_VIRTUAL) || defined(WANT_PAGE_VIRTUAL)
161 #error TODO: fix to avoid page_address() here
162 #endif
163 return (u64 *) page_address(page);
164 }
165
166 /*
167 * Handles TCE requests for emulated devices.
168 * Puts guest TCE values to the table and expects user space to convert them.
169 * Cannot fail so kvmppc_rm_tce_validate must be called before it.
170 */
kvmppc_rm_tce_put(struct kvmppc_spapr_tce_table * stt,unsigned long idx,unsigned long tce)171 static void kvmppc_rm_tce_put(struct kvmppc_spapr_tce_table *stt,
172 unsigned long idx, unsigned long tce)
173 {
174 struct page *page;
175 u64 *tbl;
176
177 idx -= stt->offset;
178 page = stt->pages[idx / TCES_PER_PAGE];
179 /*
180 * page must not be NULL in real mode,
181 * kvmppc_rm_ioba_validate() must have taken care of this.
182 */
183 WARN_ON_ONCE_RM(!page);
184 tbl = kvmppc_page_address(page);
185
186 tbl[idx % TCES_PER_PAGE] = tce;
187 }
188
189 /*
190 * TCEs pages are allocated in kvmppc_rm_tce_put() which won't be able to do so
191 * in real mode.
192 * Check if kvmppc_rm_tce_put() can succeed in real mode, i.e. a TCEs page is
193 * allocated or not required (when clearing a tce entry).
194 */
kvmppc_rm_ioba_validate(struct kvmppc_spapr_tce_table * stt,unsigned long ioba,unsigned long npages,bool clearing)195 static long kvmppc_rm_ioba_validate(struct kvmppc_spapr_tce_table *stt,
196 unsigned long ioba, unsigned long npages, bool clearing)
197 {
198 unsigned long i, idx, sttpage, sttpages;
199 unsigned long ret = kvmppc_ioba_validate(stt, ioba, npages);
200
201 if (ret)
202 return ret;
203 /*
204 * clearing==true says kvmppc_rm_tce_put won't be allocating pages
205 * for empty tces.
206 */
207 if (clearing)
208 return H_SUCCESS;
209
210 idx = (ioba >> stt->page_shift) - stt->offset;
211 sttpage = idx / TCES_PER_PAGE;
212 sttpages = _ALIGN_UP(idx % TCES_PER_PAGE + npages, TCES_PER_PAGE) /
213 TCES_PER_PAGE;
214 for (i = sttpage; i < sttpage + sttpages; ++i)
215 if (!stt->pages[i])
216 return H_TOO_HARD;
217
218 return H_SUCCESS;
219 }
220
iommu_tce_xchg_no_kill_rm(struct mm_struct * mm,struct iommu_table * tbl,unsigned long entry,unsigned long * hpa,enum dma_data_direction * direction)221 static long iommu_tce_xchg_no_kill_rm(struct mm_struct *mm,
222 struct iommu_table *tbl,
223 unsigned long entry, unsigned long *hpa,
224 enum dma_data_direction *direction)
225 {
226 long ret;
227
228 ret = tbl->it_ops->xchg_no_kill(tbl, entry, hpa, direction, true);
229
230 if (!ret && ((*direction == DMA_FROM_DEVICE) ||
231 (*direction == DMA_BIDIRECTIONAL))) {
232 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
233 /*
234 * kvmppc_rm_tce_iommu_do_map() updates the UA cache after
235 * calling this so we still get here a valid UA.
236 */
237 if (pua && *pua)
238 mm_iommu_ua_mark_dirty_rm(mm, be64_to_cpu(*pua));
239 }
240
241 return ret;
242 }
243
iommu_tce_kill_rm(struct iommu_table * tbl,unsigned long entry,unsigned long pages)244 extern void iommu_tce_kill_rm(struct iommu_table *tbl,
245 unsigned long entry, unsigned long pages)
246 {
247 if (tbl->it_ops->tce_kill)
248 tbl->it_ops->tce_kill(tbl, entry, pages, true);
249 }
250
kvmppc_rm_clear_tce(struct kvm * kvm,struct iommu_table * tbl,unsigned long entry)251 static void kvmppc_rm_clear_tce(struct kvm *kvm, struct iommu_table *tbl,
252 unsigned long entry)
253 {
254 unsigned long hpa = 0;
255 enum dma_data_direction dir = DMA_NONE;
256
257 iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir);
258 }
259
kvmppc_rm_tce_iommu_mapped_dec(struct kvm * kvm,struct iommu_table * tbl,unsigned long entry)260 static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm,
261 struct iommu_table *tbl, unsigned long entry)
262 {
263 struct mm_iommu_table_group_mem_t *mem = NULL;
264 const unsigned long pgsize = 1ULL << tbl->it_page_shift;
265 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
266
267 if (!pua)
268 /* it_userspace allocation might be delayed */
269 return H_TOO_HARD;
270
271 mem = mm_iommu_lookup_rm(kvm->mm, be64_to_cpu(*pua), pgsize);
272 if (!mem)
273 return H_TOO_HARD;
274
275 mm_iommu_mapped_dec(mem);
276
277 *pua = cpu_to_be64(0);
278
279 return H_SUCCESS;
280 }
281
kvmppc_rm_tce_iommu_do_unmap(struct kvm * kvm,struct iommu_table * tbl,unsigned long entry)282 static long kvmppc_rm_tce_iommu_do_unmap(struct kvm *kvm,
283 struct iommu_table *tbl, unsigned long entry)
284 {
285 enum dma_data_direction dir = DMA_NONE;
286 unsigned long hpa = 0;
287 long ret;
288
289 if (iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir))
290 /*
291 * real mode xchg can fail if struct page crosses
292 * a page boundary
293 */
294 return H_TOO_HARD;
295
296 if (dir == DMA_NONE)
297 return H_SUCCESS;
298
299 ret = kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
300 if (ret)
301 iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir);
302
303 return ret;
304 }
305
kvmppc_rm_tce_iommu_unmap(struct kvm * kvm,struct kvmppc_spapr_tce_table * stt,struct iommu_table * tbl,unsigned long entry)306 static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm,
307 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
308 unsigned long entry)
309 {
310 unsigned long i, ret = H_SUCCESS;
311 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
312 unsigned long io_entry = entry * subpages;
313
314 for (i = 0; i < subpages; ++i) {
315 ret = kvmppc_rm_tce_iommu_do_unmap(kvm, tbl, io_entry + i);
316 if (ret != H_SUCCESS)
317 break;
318 }
319
320 return ret;
321 }
322
kvmppc_rm_tce_iommu_do_map(struct kvm * kvm,struct iommu_table * tbl,unsigned long entry,unsigned long ua,enum dma_data_direction dir)323 static long kvmppc_rm_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
324 unsigned long entry, unsigned long ua,
325 enum dma_data_direction dir)
326 {
327 long ret;
328 unsigned long hpa = 0;
329 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
330 struct mm_iommu_table_group_mem_t *mem;
331
332 if (!pua)
333 /* it_userspace allocation might be delayed */
334 return H_TOO_HARD;
335
336 mem = mm_iommu_lookup_rm(kvm->mm, ua, 1ULL << tbl->it_page_shift);
337 if (!mem)
338 return H_TOO_HARD;
339
340 if (WARN_ON_ONCE_RM(mm_iommu_ua_to_hpa_rm(mem, ua, tbl->it_page_shift,
341 &hpa)))
342 return H_TOO_HARD;
343
344 if (WARN_ON_ONCE_RM(mm_iommu_mapped_inc(mem)))
345 return H_TOO_HARD;
346
347 ret = iommu_tce_xchg_no_kill_rm(kvm->mm, tbl, entry, &hpa, &dir);
348 if (ret) {
349 mm_iommu_mapped_dec(mem);
350 /*
351 * real mode xchg can fail if struct page crosses
352 * a page boundary
353 */
354 return H_TOO_HARD;
355 }
356
357 if (dir != DMA_NONE)
358 kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
359
360 *pua = cpu_to_be64(ua);
361
362 return 0;
363 }
364
kvmppc_rm_tce_iommu_map(struct kvm * kvm,struct kvmppc_spapr_tce_table * stt,struct iommu_table * tbl,unsigned long entry,unsigned long ua,enum dma_data_direction dir)365 static long kvmppc_rm_tce_iommu_map(struct kvm *kvm,
366 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
367 unsigned long entry, unsigned long ua,
368 enum dma_data_direction dir)
369 {
370 unsigned long i, pgoff, ret = H_SUCCESS;
371 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
372 unsigned long io_entry = entry * subpages;
373
374 for (i = 0, pgoff = 0; i < subpages;
375 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) {
376
377 ret = kvmppc_rm_tce_iommu_do_map(kvm, tbl,
378 io_entry + i, ua + pgoff, dir);
379 if (ret != H_SUCCESS)
380 break;
381 }
382
383 return ret;
384 }
385
kvmppc_rm_h_put_tce(struct kvm_vcpu * vcpu,unsigned long liobn,unsigned long ioba,unsigned long tce)386 long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
387 unsigned long ioba, unsigned long tce)
388 {
389 struct kvmppc_spapr_tce_table *stt;
390 long ret;
391 struct kvmppc_spapr_tce_iommu_table *stit;
392 unsigned long entry, ua = 0;
393 enum dma_data_direction dir;
394
395 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
396 /* liobn, ioba, tce); */
397
398 /* For radix, we might be in virtual mode, so punt */
399 if (kvm_is_radix(vcpu->kvm))
400 return H_TOO_HARD;
401
402 stt = kvmppc_find_table(vcpu->kvm, liobn);
403 if (!stt)
404 return H_TOO_HARD;
405
406 ret = kvmppc_rm_ioba_validate(stt, ioba, 1, tce == 0);
407 if (ret != H_SUCCESS)
408 return ret;
409
410 ret = kvmppc_rm_tce_validate(stt, tce);
411 if (ret != H_SUCCESS)
412 return ret;
413
414 dir = iommu_tce_direction(tce);
415 if ((dir != DMA_NONE) && kvmppc_rm_tce_to_ua(vcpu->kvm, tce, &ua, NULL))
416 return H_PARAMETER;
417
418 entry = ioba >> stt->page_shift;
419
420 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
421 if (dir == DMA_NONE)
422 ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt,
423 stit->tbl, entry);
424 else
425 ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
426 stit->tbl, entry, ua, dir);
427
428 iommu_tce_kill_rm(stit->tbl, entry, 1);
429
430 if (ret != H_SUCCESS) {
431 kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl, entry);
432 return ret;
433 }
434 }
435
436 kvmppc_rm_tce_put(stt, entry, tce);
437
438 return H_SUCCESS;
439 }
440
kvmppc_rm_ua_to_hpa(struct kvm_vcpu * vcpu,unsigned long ua,unsigned long * phpa)441 static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu,
442 unsigned long ua, unsigned long *phpa)
443 {
444 pte_t *ptep, pte;
445 unsigned shift = 0;
446
447 /*
448 * Called in real mode with MSR_EE = 0. We are safe here.
449 * It is ok to do the lookup with arch.pgdir here, because
450 * we are doing this on secondary cpus and current task there
451 * is not the hypervisor. Also this is safe against THP in the
452 * host, because an IPI to primary thread will wait for the secondary
453 * to exit which will agains result in the below page table walk
454 * to finish.
455 */
456 ptep = __find_linux_pte(vcpu->arch.pgdir, ua, NULL, &shift);
457 if (!ptep || !pte_present(*ptep))
458 return -ENXIO;
459 pte = *ptep;
460
461 if (!shift)
462 shift = PAGE_SHIFT;
463
464 /* Avoid handling anything potentially complicated in realmode */
465 if (shift > PAGE_SHIFT)
466 return -EAGAIN;
467
468 if (!pte_young(pte))
469 return -EAGAIN;
470
471 *phpa = (pte_pfn(pte) << PAGE_SHIFT) | (ua & ((1ULL << shift) - 1)) |
472 (ua & ~PAGE_MASK);
473
474 return 0;
475 }
476
kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu * vcpu,unsigned long liobn,unsigned long ioba,unsigned long tce_list,unsigned long npages)477 long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
478 unsigned long liobn, unsigned long ioba,
479 unsigned long tce_list, unsigned long npages)
480 {
481 struct kvmppc_spapr_tce_table *stt;
482 long i, ret = H_SUCCESS;
483 unsigned long tces, entry, ua = 0;
484 unsigned long *rmap = NULL;
485 bool prereg = false;
486 struct kvmppc_spapr_tce_iommu_table *stit;
487
488 /* For radix, we might be in virtual mode, so punt */
489 if (kvm_is_radix(vcpu->kvm))
490 return H_TOO_HARD;
491
492 stt = kvmppc_find_table(vcpu->kvm, liobn);
493 if (!stt)
494 return H_TOO_HARD;
495
496 entry = ioba >> stt->page_shift;
497 /*
498 * The spec says that the maximum size of the list is 512 TCEs
499 * so the whole table addressed resides in 4K page
500 */
501 if (npages > 512)
502 return H_PARAMETER;
503
504 if (tce_list & (SZ_4K - 1))
505 return H_PARAMETER;
506
507 ret = kvmppc_rm_ioba_validate(stt, ioba, npages, false);
508 if (ret != H_SUCCESS)
509 return ret;
510
511 if (mm_iommu_preregistered(vcpu->kvm->mm)) {
512 /*
513 * We get here if guest memory was pre-registered which
514 * is normally VFIO case and gpa->hpa translation does not
515 * depend on hpt.
516 */
517 struct mm_iommu_table_group_mem_t *mem;
518
519 if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce_list, &ua, NULL))
520 return H_TOO_HARD;
521
522 mem = mm_iommu_lookup_rm(vcpu->kvm->mm, ua, IOMMU_PAGE_SIZE_4K);
523 if (mem)
524 prereg = mm_iommu_ua_to_hpa_rm(mem, ua,
525 IOMMU_PAGE_SHIFT_4K, &tces) == 0;
526 }
527
528 if (!prereg) {
529 /*
530 * This is usually a case of a guest with emulated devices only
531 * when TCE list is not in preregistered memory.
532 * We do not require memory to be preregistered in this case
533 * so lock rmap and do __find_linux_pte_or_hugepte().
534 */
535 if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
536 return H_TOO_HARD;
537
538 rmap = (void *) vmalloc_to_phys(rmap);
539 if (WARN_ON_ONCE_RM(!rmap))
540 return H_TOO_HARD;
541
542 /*
543 * Synchronize with the MMU notifier callbacks in
544 * book3s_64_mmu_hv.c (kvm_unmap_hva_range_hv etc.).
545 * While we have the rmap lock, code running on other CPUs
546 * cannot finish unmapping the host real page that backs
547 * this guest real page, so we are OK to access the host
548 * real page.
549 */
550 lock_rmap(rmap);
551 if (kvmppc_rm_ua_to_hpa(vcpu, ua, &tces)) {
552 ret = H_TOO_HARD;
553 goto unlock_exit;
554 }
555 }
556
557 for (i = 0; i < npages; ++i) {
558 unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
559
560 ret = kvmppc_rm_tce_validate(stt, tce);
561 if (ret != H_SUCCESS)
562 goto unlock_exit;
563 }
564
565 for (i = 0; i < npages; ++i) {
566 unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
567
568 ua = 0;
569 if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce, &ua, NULL)) {
570 ret = H_PARAMETER;
571 goto invalidate_exit;
572 }
573
574 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
575 ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
576 stit->tbl, entry + i, ua,
577 iommu_tce_direction(tce));
578
579 if (ret != H_SUCCESS) {
580 kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl,
581 entry);
582 goto invalidate_exit;
583 }
584 }
585
586 kvmppc_rm_tce_put(stt, entry + i, tce);
587 }
588
589 invalidate_exit:
590 list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
591 iommu_tce_kill_rm(stit->tbl, entry, npages);
592
593 unlock_exit:
594 if (rmap)
595 unlock_rmap(rmap);
596
597 return ret;
598 }
599
kvmppc_rm_h_stuff_tce(struct kvm_vcpu * vcpu,unsigned long liobn,unsigned long ioba,unsigned long tce_value,unsigned long npages)600 long kvmppc_rm_h_stuff_tce(struct kvm_vcpu *vcpu,
601 unsigned long liobn, unsigned long ioba,
602 unsigned long tce_value, unsigned long npages)
603 {
604 struct kvmppc_spapr_tce_table *stt;
605 long i, ret;
606 struct kvmppc_spapr_tce_iommu_table *stit;
607
608 /* For radix, we might be in virtual mode, so punt */
609 if (kvm_is_radix(vcpu->kvm))
610 return H_TOO_HARD;
611
612 stt = kvmppc_find_table(vcpu->kvm, liobn);
613 if (!stt)
614 return H_TOO_HARD;
615
616 ret = kvmppc_rm_ioba_validate(stt, ioba, npages, tce_value == 0);
617 if (ret != H_SUCCESS)
618 return ret;
619
620 /* Check permission bits only to allow userspace poison TCE for debug */
621 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
622 return H_PARAMETER;
623
624 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
625 unsigned long entry = ioba >> stt->page_shift;
626
627 for (i = 0; i < npages; ++i) {
628 ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt,
629 stit->tbl, entry + i);
630
631 if (ret == H_SUCCESS)
632 continue;
633
634 if (ret == H_TOO_HARD)
635 goto invalidate_exit;
636
637 WARN_ON_ONCE_RM(1);
638 kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl, entry);
639 }
640 }
641
642 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
643 kvmppc_rm_tce_put(stt, ioba >> stt->page_shift, tce_value);
644
645 invalidate_exit:
646 list_for_each_entry_lockless(stit, &stt->iommu_tables, next)
647 iommu_tce_kill_rm(stit->tbl, ioba >> stt->page_shift, npages);
648
649 return ret;
650 }
651
652 /* This can be called in either virtual mode or real mode */
kvmppc_h_get_tce(struct kvm_vcpu * vcpu,unsigned long liobn,unsigned long ioba)653 long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
654 unsigned long ioba)
655 {
656 struct kvmppc_spapr_tce_table *stt;
657 long ret;
658 unsigned long idx;
659 struct page *page;
660 u64 *tbl;
661
662 stt = kvmppc_find_table(vcpu->kvm, liobn);
663 if (!stt)
664 return H_TOO_HARD;
665
666 ret = kvmppc_ioba_validate(stt, ioba, 1);
667 if (ret != H_SUCCESS)
668 return ret;
669
670 idx = (ioba >> stt->page_shift) - stt->offset;
671 page = stt->pages[idx / TCES_PER_PAGE];
672 if (!page) {
673 vcpu->arch.regs.gpr[4] = 0;
674 return H_SUCCESS;
675 }
676 tbl = (u64 *)page_address(page);
677
678 vcpu->arch.regs.gpr[4] = tbl[idx % TCES_PER_PAGE];
679
680 return H_SUCCESS;
681 }
682 EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);
683
684 #endif /* KVM_BOOK3S_HV_POSSIBLE */
685
