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 */
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
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 */
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 */
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 */
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 */
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
221 static long iommu_tce_xchg_rm(struct mm_struct *mm, struct iommu_table *tbl,
222 unsigned long entry, unsigned long *hpa,
223 enum dma_data_direction *direction)
224 {
225 long ret;
226
227 ret = tbl->it_ops->exchange_rm(tbl, entry, hpa, direction);
228
229 if (!ret && ((*direction == DMA_FROM_DEVICE) ||
230 (*direction == DMA_BIDIRECTIONAL))) {
231 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
232 /*
233 * kvmppc_rm_tce_iommu_do_map() updates the UA cache after
234 * calling this so we still get here a valid UA.
235 */
236 if (pua && *pua)
237 mm_iommu_ua_mark_dirty_rm(mm, be64_to_cpu(*pua));
238 }
239
240 return ret;
241 }
242
243 static void kvmppc_rm_clear_tce(struct kvm *kvm, struct iommu_table *tbl,
244 unsigned long entry)
245 {
246 unsigned long hpa = 0;
247 enum dma_data_direction dir = DMA_NONE;
248
249 iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir);
250 }
251
252 static long kvmppc_rm_tce_iommu_mapped_dec(struct kvm *kvm,
253 struct iommu_table *tbl, unsigned long entry)
254 {
255 struct mm_iommu_table_group_mem_t *mem = NULL;
256 const unsigned long pgsize = 1ULL << tbl->it_page_shift;
257 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
258
259 if (!pua)
260 /* it_userspace allocation might be delayed */
261 return H_TOO_HARD;
262
263 mem = mm_iommu_lookup_rm(kvm->mm, be64_to_cpu(*pua), pgsize);
264 if (!mem)
265 return H_TOO_HARD;
266
267 mm_iommu_mapped_dec(mem);
268
269 *pua = cpu_to_be64(0);
270
271 return H_SUCCESS;
272 }
273
274 static long kvmppc_rm_tce_iommu_do_unmap(struct kvm *kvm,
275 struct iommu_table *tbl, unsigned long entry)
276 {
277 enum dma_data_direction dir = DMA_NONE;
278 unsigned long hpa = 0;
279 long ret;
280
281 if (iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir))
282 /*
283 * real mode xchg can fail if struct page crosses
284 * a page boundary
285 */
286 return H_TOO_HARD;
287
288 if (dir == DMA_NONE)
289 return H_SUCCESS;
290
291 ret = kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
292 if (ret)
293 iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir);
294
295 return ret;
296 }
297
298 static long kvmppc_rm_tce_iommu_unmap(struct kvm *kvm,
299 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
300 unsigned long entry)
301 {
302 unsigned long i, ret = H_SUCCESS;
303 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
304 unsigned long io_entry = entry * subpages;
305
306 for (i = 0; i < subpages; ++i) {
307 ret = kvmppc_rm_tce_iommu_do_unmap(kvm, tbl, io_entry + i);
308 if (ret != H_SUCCESS)
309 break;
310 }
311
312 return ret;
313 }
314
315 static long kvmppc_rm_tce_iommu_do_map(struct kvm *kvm, struct iommu_table *tbl,
316 unsigned long entry, unsigned long ua,
317 enum dma_data_direction dir)
318 {
319 long ret;
320 unsigned long hpa = 0;
321 __be64 *pua = IOMMU_TABLE_USERSPACE_ENTRY_RO(tbl, entry);
322 struct mm_iommu_table_group_mem_t *mem;
323
324 if (!pua)
325 /* it_userspace allocation might be delayed */
326 return H_TOO_HARD;
327
328 mem = mm_iommu_lookup_rm(kvm->mm, ua, 1ULL << tbl->it_page_shift);
329 if (!mem)
330 return H_TOO_HARD;
331
332 if (WARN_ON_ONCE_RM(mm_iommu_ua_to_hpa_rm(mem, ua, tbl->it_page_shift,
333 &hpa)))
334 return H_TOO_HARD;
335
336 if (WARN_ON_ONCE_RM(mm_iommu_mapped_inc(mem)))
337 return H_TOO_HARD;
338
339 ret = iommu_tce_xchg_rm(kvm->mm, tbl, entry, &hpa, &dir);
340 if (ret) {
341 mm_iommu_mapped_dec(mem);
342 /*
343 * real mode xchg can fail if struct page crosses
344 * a page boundary
345 */
346 return H_TOO_HARD;
347 }
348
349 if (dir != DMA_NONE)
350 kvmppc_rm_tce_iommu_mapped_dec(kvm, tbl, entry);
351
352 *pua = cpu_to_be64(ua);
353
354 return 0;
355 }
356
357 static long kvmppc_rm_tce_iommu_map(struct kvm *kvm,
358 struct kvmppc_spapr_tce_table *stt, struct iommu_table *tbl,
359 unsigned long entry, unsigned long ua,
360 enum dma_data_direction dir)
361 {
362 unsigned long i, pgoff, ret = H_SUCCESS;
363 unsigned long subpages = 1ULL << (stt->page_shift - tbl->it_page_shift);
364 unsigned long io_entry = entry * subpages;
365
366 for (i = 0, pgoff = 0; i < subpages;
367 ++i, pgoff += IOMMU_PAGE_SIZE(tbl)) {
368
369 ret = kvmppc_rm_tce_iommu_do_map(kvm, tbl,
370 io_entry + i, ua + pgoff, dir);
371 if (ret != H_SUCCESS)
372 break;
373 }
374
375 return ret;
376 }
377
378 long kvmppc_rm_h_put_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
379 unsigned long ioba, unsigned long tce)
380 {
381 struct kvmppc_spapr_tce_table *stt;
382 long ret;
383 struct kvmppc_spapr_tce_iommu_table *stit;
384 unsigned long entry, ua = 0;
385 enum dma_data_direction dir;
386
387 /* udbg_printf("H_PUT_TCE(): liobn=0x%lx ioba=0x%lx, tce=0x%lx\n", */
388 /* liobn, ioba, tce); */
389
390 /* For radix, we might be in virtual mode, so punt */
391 if (kvm_is_radix(vcpu->kvm))
392 return H_TOO_HARD;
393
394 stt = kvmppc_find_table(vcpu->kvm, liobn);
395 if (!stt)
396 return H_TOO_HARD;
397
398 ret = kvmppc_rm_ioba_validate(stt, ioba, 1, tce == 0);
399 if (ret != H_SUCCESS)
400 return ret;
401
402 ret = kvmppc_rm_tce_validate(stt, tce);
403 if (ret != H_SUCCESS)
404 return ret;
405
406 dir = iommu_tce_direction(tce);
407 if ((dir != DMA_NONE) && kvmppc_rm_tce_to_ua(vcpu->kvm, tce, &ua, NULL))
408 return H_PARAMETER;
409
410 entry = ioba >> stt->page_shift;
411
412 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
413 if (dir == DMA_NONE)
414 ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt,
415 stit->tbl, entry);
416 else
417 ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
418 stit->tbl, entry, ua, dir);
419
420 if (ret != H_SUCCESS) {
421 kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl, entry);
422 return ret;
423 }
424 }
425
426 kvmppc_rm_tce_put(stt, entry, tce);
427
428 return H_SUCCESS;
429 }
430
431 static long kvmppc_rm_ua_to_hpa(struct kvm_vcpu *vcpu,
432 unsigned long ua, unsigned long *phpa)
433 {
434 pte_t *ptep, pte;
435 unsigned shift = 0;
436
437 /*
438 * Called in real mode with MSR_EE = 0. We are safe here.
439 * It is ok to do the lookup with arch.pgdir here, because
440 * we are doing this on secondary cpus and current task there
441 * is not the hypervisor. Also this is safe against THP in the
442 * host, because an IPI to primary thread will wait for the secondary
443 * to exit which will agains result in the below page table walk
444 * to finish.
445 */
446 ptep = __find_linux_pte(vcpu->arch.pgdir, ua, NULL, &shift);
447 if (!ptep || !pte_present(*ptep))
448 return -ENXIO;
449 pte = *ptep;
450
451 if (!shift)
452 shift = PAGE_SHIFT;
453
454 /* Avoid handling anything potentially complicated in realmode */
455 if (shift > PAGE_SHIFT)
456 return -EAGAIN;
457
458 if (!pte_young(pte))
459 return -EAGAIN;
460
461 *phpa = (pte_pfn(pte) << PAGE_SHIFT) | (ua & ((1ULL << shift) - 1)) |
462 (ua & ~PAGE_MASK);
463
464 return 0;
465 }
466
467 long kvmppc_rm_h_put_tce_indirect(struct kvm_vcpu *vcpu,
468 unsigned long liobn, unsigned long ioba,
469 unsigned long tce_list, unsigned long npages)
470 {
471 struct kvmppc_spapr_tce_table *stt;
472 long i, ret = H_SUCCESS;
473 unsigned long tces, entry, ua = 0;
474 unsigned long *rmap = NULL;
475 bool prereg = false;
476 struct kvmppc_spapr_tce_iommu_table *stit;
477
478 /* For radix, we might be in virtual mode, so punt */
479 if (kvm_is_radix(vcpu->kvm))
480 return H_TOO_HARD;
481
482 stt = kvmppc_find_table(vcpu->kvm, liobn);
483 if (!stt)
484 return H_TOO_HARD;
485
486 entry = ioba >> stt->page_shift;
487 /*
488 * The spec says that the maximum size of the list is 512 TCEs
489 * so the whole table addressed resides in 4K page
490 */
491 if (npages > 512)
492 return H_PARAMETER;
493
494 if (tce_list & (SZ_4K - 1))
495 return H_PARAMETER;
496
497 ret = kvmppc_rm_ioba_validate(stt, ioba, npages, false);
498 if (ret != H_SUCCESS)
499 return ret;
500
501 if (mm_iommu_preregistered(vcpu->kvm->mm)) {
502 /*
503 * We get here if guest memory was pre-registered which
504 * is normally VFIO case and gpa->hpa translation does not
505 * depend on hpt.
506 */
507 struct mm_iommu_table_group_mem_t *mem;
508
509 if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce_list, &ua, NULL))
510 return H_TOO_HARD;
511
512 mem = mm_iommu_lookup_rm(vcpu->kvm->mm, ua, IOMMU_PAGE_SIZE_4K);
513 if (mem)
514 prereg = mm_iommu_ua_to_hpa_rm(mem, ua,
515 IOMMU_PAGE_SHIFT_4K, &tces) == 0;
516 }
517
518 if (!prereg) {
519 /*
520 * This is usually a case of a guest with emulated devices only
521 * when TCE list is not in preregistered memory.
522 * We do not require memory to be preregistered in this case
523 * so lock rmap and do __find_linux_pte_or_hugepte().
524 */
525 if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce_list, &ua, &rmap))
526 return H_TOO_HARD;
527
528 rmap = (void *) vmalloc_to_phys(rmap);
529 if (WARN_ON_ONCE_RM(!rmap))
530 return H_TOO_HARD;
531
532 /*
533 * Synchronize with the MMU notifier callbacks in
534 * book3s_64_mmu_hv.c (kvm_unmap_hva_range_hv etc.).
535 * While we have the rmap lock, code running on other CPUs
536 * cannot finish unmapping the host real page that backs
537 * this guest real page, so we are OK to access the host
538 * real page.
539 */
540 lock_rmap(rmap);
541 if (kvmppc_rm_ua_to_hpa(vcpu, ua, &tces)) {
542 ret = H_TOO_HARD;
543 goto unlock_exit;
544 }
545 }
546
547 for (i = 0; i < npages; ++i) {
548 unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
549
550 ret = kvmppc_rm_tce_validate(stt, tce);
551 if (ret != H_SUCCESS)
552 goto unlock_exit;
553 }
554
555 for (i = 0; i < npages; ++i) {
556 unsigned long tce = be64_to_cpu(((u64 *)tces)[i]);
557
558 ua = 0;
559 if (kvmppc_rm_tce_to_ua(vcpu->kvm, tce, &ua, NULL)) {
560 ret = H_PARAMETER;
561 goto unlock_exit;
562 }
563
564 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
565 ret = kvmppc_rm_tce_iommu_map(vcpu->kvm, stt,
566 stit->tbl, entry + i, ua,
567 iommu_tce_direction(tce));
568
569 if (ret != H_SUCCESS) {
570 kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl,
571 entry);
572 goto unlock_exit;
573 }
574 }
575
576 kvmppc_rm_tce_put(stt, entry + i, tce);
577 }
578
579 unlock_exit:
580 if (rmap)
581 unlock_rmap(rmap);
582
583 return ret;
584 }
585
586 long kvmppc_rm_h_stuff_tce(struct kvm_vcpu *vcpu,
587 unsigned long liobn, unsigned long ioba,
588 unsigned long tce_value, unsigned long npages)
589 {
590 struct kvmppc_spapr_tce_table *stt;
591 long i, ret;
592 struct kvmppc_spapr_tce_iommu_table *stit;
593
594 /* For radix, we might be in virtual mode, so punt */
595 if (kvm_is_radix(vcpu->kvm))
596 return H_TOO_HARD;
597
598 stt = kvmppc_find_table(vcpu->kvm, liobn);
599 if (!stt)
600 return H_TOO_HARD;
601
602 ret = kvmppc_rm_ioba_validate(stt, ioba, npages, tce_value == 0);
603 if (ret != H_SUCCESS)
604 return ret;
605
606 /* Check permission bits only to allow userspace poison TCE for debug */
607 if (tce_value & (TCE_PCI_WRITE | TCE_PCI_READ))
608 return H_PARAMETER;
609
610 list_for_each_entry_lockless(stit, &stt->iommu_tables, next) {
611 unsigned long entry = ioba >> stt->page_shift;
612
613 for (i = 0; i < npages; ++i) {
614 ret = kvmppc_rm_tce_iommu_unmap(vcpu->kvm, stt,
615 stit->tbl, entry + i);
616
617 if (ret == H_SUCCESS)
618 continue;
619
620 if (ret == H_TOO_HARD)
621 return ret;
622
623 WARN_ON_ONCE_RM(1);
624 kvmppc_rm_clear_tce(vcpu->kvm, stit->tbl, entry);
625 }
626 }
627
628 for (i = 0; i < npages; ++i, ioba += (1ULL << stt->page_shift))
629 kvmppc_rm_tce_put(stt, ioba >> stt->page_shift, tce_value);
630
631 return H_SUCCESS;
632 }
633
634 /* This can be called in either virtual mode or real mode */
635 long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn,
636 unsigned long ioba)
637 {
638 struct kvmppc_spapr_tce_table *stt;
639 long ret;
640 unsigned long idx;
641 struct page *page;
642 u64 *tbl;
643
644 stt = kvmppc_find_table(vcpu->kvm, liobn);
645 if (!stt)
646 return H_TOO_HARD;
647
648 ret = kvmppc_ioba_validate(stt, ioba, 1);
649 if (ret != H_SUCCESS)
650 return ret;
651
652 idx = (ioba >> stt->page_shift) - stt->offset;
653 page = stt->pages[idx / TCES_PER_PAGE];
654 if (!page) {
655 vcpu->arch.regs.gpr[4] = 0;
656 return H_SUCCESS;
657 }
658 tbl = (u64 *)page_address(page);
659
660 vcpu->arch.regs.gpr[4] = tbl[idx % TCES_PER_PAGE];
661
662 return H_SUCCESS;
663 }
664 EXPORT_SYMBOL_GPL(kvmppc_h_get_tce);
665
666 #endif /* KVM_BOOK3S_HV_POSSIBLE */
667
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