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64#include <linux/init.h>
65#include <linux/export.h>
66#include <linux/list.h>
67#include <linux/hash.h>
68#include <linux/sched.h>
69#include <linux/seq_file.h>
70#include <linux/memblock.h>
71#include <linux/slab.h>
72#include <linux/vmalloc.h>
73
74#include <asm/cache.h>
75#include <asm/setup.h>
76#include <linux/uaccess.h>
77
78#include <asm/xen/page.h>
79#include <asm/xen/hypercall.h>
80#include <asm/xen/hypervisor.h>
81#include <xen/balloon.h>
82#include <xen/grant_table.h>
83
84#include "multicalls.h"
85#include "xen-ops.h"
86
87#define P2M_MID_PER_PAGE (PAGE_SIZE / sizeof(unsigned long *))
88#define P2M_TOP_PER_PAGE (PAGE_SIZE / sizeof(unsigned long **))
89
90#define MAX_P2M_PFN (P2M_TOP_PER_PAGE * P2M_MID_PER_PAGE * P2M_PER_PAGE)
91
92#define PMDS_PER_MID_PAGE (P2M_MID_PER_PAGE / PTRS_PER_PTE)
93
94unsigned long *xen_p2m_addr __read_mostly;
95EXPORT_SYMBOL_GPL(xen_p2m_addr);
96unsigned long xen_p2m_size __read_mostly;
97EXPORT_SYMBOL_GPL(xen_p2m_size);
98unsigned long xen_max_p2m_pfn __read_mostly;
99EXPORT_SYMBOL_GPL(xen_max_p2m_pfn);
100
101#ifdef CONFIG_XEN_MEMORY_HOTPLUG_LIMIT
102#define P2M_LIMIT CONFIG_XEN_MEMORY_HOTPLUG_LIMIT
103#else
104#define P2M_LIMIT 0
105#endif
106
107static DEFINE_SPINLOCK(p2m_update_lock);
108
109static unsigned long *p2m_mid_missing_mfn;
110static unsigned long *p2m_top_mfn;
111static unsigned long **p2m_top_mfn_p;
112static unsigned long *p2m_missing;
113static unsigned long *p2m_identity;
114static pte_t *p2m_missing_pte;
115static pte_t *p2m_identity_pte;
116
117
118
119
120
121
122
123
124static unsigned long xen_p2m_last_pfn;
125
126static inline unsigned p2m_top_index(unsigned long pfn)
127{
128 BUG_ON(pfn >= MAX_P2M_PFN);
129 return pfn / (P2M_MID_PER_PAGE * P2M_PER_PAGE);
130}
131
132static inline unsigned p2m_mid_index(unsigned long pfn)
133{
134 return (pfn / P2M_PER_PAGE) % P2M_MID_PER_PAGE;
135}
136
137static inline unsigned p2m_index(unsigned long pfn)
138{
139 return pfn % P2M_PER_PAGE;
140}
141
142static void p2m_top_mfn_init(unsigned long *top)
143{
144 unsigned i;
145
146 for (i = 0; i < P2M_TOP_PER_PAGE; i++)
147 top[i] = virt_to_mfn(p2m_mid_missing_mfn);
148}
149
150static void p2m_top_mfn_p_init(unsigned long **top)
151{
152 unsigned i;
153
154 for (i = 0; i < P2M_TOP_PER_PAGE; i++)
155 top[i] = p2m_mid_missing_mfn;
156}
157
158static void p2m_mid_mfn_init(unsigned long *mid, unsigned long *leaf)
159{
160 unsigned i;
161
162 for (i = 0; i < P2M_MID_PER_PAGE; i++)
163 mid[i] = virt_to_mfn(leaf);
164}
165
166static void p2m_init(unsigned long *p2m)
167{
168 unsigned i;
169
170 for (i = 0; i < P2M_PER_PAGE; i++)
171 p2m[i] = INVALID_P2M_ENTRY;
172}
173
174static void p2m_init_identity(unsigned long *p2m, unsigned long pfn)
175{
176 unsigned i;
177
178 for (i = 0; i < P2M_PER_PAGE; i++)
179 p2m[i] = IDENTITY_FRAME(pfn + i);
180}
181
182static void * __ref alloc_p2m_page(void)
183{
184 if (unlikely(!slab_is_available())) {
185 void *ptr = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
186
187 if (!ptr)
188 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
189 __func__, PAGE_SIZE, PAGE_SIZE);
190
191 return ptr;
192 }
193
194 return (void *)__get_free_page(GFP_KERNEL);
195}
196
197static void __ref free_p2m_page(void *p)
198{
199 if (unlikely(!slab_is_available())) {
200 memblock_free((unsigned long)p, PAGE_SIZE);
201 return;
202 }
203
204 free_page((unsigned long)p);
205}
206
207
208
209
210
211
212
213
214
215
216
217void __ref xen_build_mfn_list_list(void)
218{
219 unsigned long pfn, mfn;
220 pte_t *ptep;
221 unsigned int level, topidx, mididx;
222 unsigned long *mid_mfn_p;
223
224 if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
225 return;
226
227
228 if (p2m_top_mfn == NULL) {
229 p2m_mid_missing_mfn = alloc_p2m_page();
230 p2m_mid_mfn_init(p2m_mid_missing_mfn, p2m_missing);
231
232 p2m_top_mfn_p = alloc_p2m_page();
233 p2m_top_mfn_p_init(p2m_top_mfn_p);
234
235 p2m_top_mfn = alloc_p2m_page();
236 p2m_top_mfn_init(p2m_top_mfn);
237 } else {
238
239 p2m_mid_mfn_init(p2m_mid_missing_mfn, p2m_missing);
240 }
241
242 for (pfn = 0; pfn < xen_max_p2m_pfn && pfn < MAX_P2M_PFN;
243 pfn += P2M_PER_PAGE) {
244 topidx = p2m_top_index(pfn);
245 mididx = p2m_mid_index(pfn);
246
247 mid_mfn_p = p2m_top_mfn_p[topidx];
248 ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn),
249 &level);
250 BUG_ON(!ptep || level != PG_LEVEL_4K);
251 mfn = pte_mfn(*ptep);
252 ptep = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
253
254
255
256
257
258 if (ptep == p2m_missing_pte || ptep == p2m_identity_pte) {
259 BUG_ON(mididx);
260 BUG_ON(mid_mfn_p != p2m_mid_missing_mfn);
261 p2m_top_mfn[topidx] = virt_to_mfn(p2m_mid_missing_mfn);
262 pfn += (P2M_MID_PER_PAGE - 1) * P2M_PER_PAGE;
263 continue;
264 }
265
266 if (mid_mfn_p == p2m_mid_missing_mfn) {
267 mid_mfn_p = alloc_p2m_page();
268 p2m_mid_mfn_init(mid_mfn_p, p2m_missing);
269
270 p2m_top_mfn_p[topidx] = mid_mfn_p;
271 }
272
273 p2m_top_mfn[topidx] = virt_to_mfn(mid_mfn_p);
274 mid_mfn_p[mididx] = mfn;
275 }
276}
277
278void xen_setup_mfn_list_list(void)
279{
280 BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
281
282 if (xen_start_info->flags & SIF_VIRT_P2M_4TOOLS)
283 HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = ~0UL;
284 else
285 HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
286 virt_to_mfn(p2m_top_mfn);
287 HYPERVISOR_shared_info->arch.max_pfn = xen_p2m_last_pfn;
288 HYPERVISOR_shared_info->arch.p2m_generation = 0;
289 HYPERVISOR_shared_info->arch.p2m_vaddr = (unsigned long)xen_p2m_addr;
290 HYPERVISOR_shared_info->arch.p2m_cr3 =
291 xen_pfn_to_cr3(virt_to_mfn(swapper_pg_dir));
292}
293
294
295void __init xen_build_dynamic_phys_to_machine(void)
296{
297 unsigned long pfn;
298
299 xen_p2m_addr = (unsigned long *)xen_start_info->mfn_list;
300 xen_p2m_size = ALIGN(xen_start_info->nr_pages, P2M_PER_PAGE);
301
302 for (pfn = xen_start_info->nr_pages; pfn < xen_p2m_size; pfn++)
303 xen_p2m_addr[pfn] = INVALID_P2M_ENTRY;
304
305 xen_max_p2m_pfn = xen_p2m_size;
306}
307
308#define P2M_TYPE_IDENTITY 0
309#define P2M_TYPE_MISSING 1
310#define P2M_TYPE_PFN 2
311#define P2M_TYPE_UNKNOWN 3
312
313static int xen_p2m_elem_type(unsigned long pfn)
314{
315 unsigned long mfn;
316
317 if (pfn >= xen_p2m_size)
318 return P2M_TYPE_IDENTITY;
319
320 mfn = xen_p2m_addr[pfn];
321
322 if (mfn == INVALID_P2M_ENTRY)
323 return P2M_TYPE_MISSING;
324
325 if (mfn & IDENTITY_FRAME_BIT)
326 return P2M_TYPE_IDENTITY;
327
328 return P2M_TYPE_PFN;
329}
330
331static void __init xen_rebuild_p2m_list(unsigned long *p2m)
332{
333 unsigned int i, chunk;
334 unsigned long pfn;
335 unsigned long *mfns;
336 pte_t *ptep;
337 pmd_t *pmdp;
338 int type;
339
340 p2m_missing = alloc_p2m_page();
341 p2m_init(p2m_missing);
342 p2m_identity = alloc_p2m_page();
343 p2m_init(p2m_identity);
344
345 p2m_missing_pte = alloc_p2m_page();
346 paravirt_alloc_pte(&init_mm, __pa(p2m_missing_pte) >> PAGE_SHIFT);
347 p2m_identity_pte = alloc_p2m_page();
348 paravirt_alloc_pte(&init_mm, __pa(p2m_identity_pte) >> PAGE_SHIFT);
349 for (i = 0; i < PTRS_PER_PTE; i++) {
350 set_pte(p2m_missing_pte + i,
351 pfn_pte(PFN_DOWN(__pa(p2m_missing)), PAGE_KERNEL_RO));
352 set_pte(p2m_identity_pte + i,
353 pfn_pte(PFN_DOWN(__pa(p2m_identity)), PAGE_KERNEL_RO));
354 }
355
356 for (pfn = 0; pfn < xen_max_p2m_pfn; pfn += chunk) {
357
358
359
360
361
362
363
364
365
366
367 chunk = (pfn & (P2M_PER_PAGE * P2M_MID_PER_PAGE - 1)) ?
368 P2M_PER_PAGE : P2M_PER_PAGE * P2M_MID_PER_PAGE;
369
370 type = xen_p2m_elem_type(pfn);
371 i = 0;
372 if (type != P2M_TYPE_PFN)
373 for (i = 1; i < chunk; i++)
374 if (xen_p2m_elem_type(pfn + i) != type)
375 break;
376 if (i < chunk)
377
378 chunk = P2M_PER_PAGE;
379
380 if (type == P2M_TYPE_PFN || i < chunk) {
381
382 mfns = alloc_p2m_page();
383 copy_page(mfns, xen_p2m_addr + pfn);
384 ptep = populate_extra_pte((unsigned long)(p2m + pfn));
385 set_pte(ptep,
386 pfn_pte(PFN_DOWN(__pa(mfns)), PAGE_KERNEL));
387 continue;
388 }
389
390 if (chunk == P2M_PER_PAGE) {
391
392 mfns = (type == P2M_TYPE_MISSING) ?
393 p2m_missing : p2m_identity;
394 ptep = populate_extra_pte((unsigned long)(p2m + pfn));
395 set_pte(ptep,
396 pfn_pte(PFN_DOWN(__pa(mfns)), PAGE_KERNEL_RO));
397 continue;
398 }
399
400
401 ptep = (type == P2M_TYPE_MISSING) ?
402 p2m_missing_pte : p2m_identity_pte;
403 for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
404 pmdp = populate_extra_pmd(
405 (unsigned long)(p2m + pfn) + i * PMD_SIZE);
406 set_pmd(pmdp, __pmd(__pa(ptep) | _KERNPG_TABLE));
407 }
408 }
409}
410
411void __init xen_vmalloc_p2m_tree(void)
412{
413 static struct vm_struct vm;
414 unsigned long p2m_limit;
415
416 xen_p2m_last_pfn = xen_max_p2m_pfn;
417
418 p2m_limit = (phys_addr_t)P2M_LIMIT * 1024 * 1024 * 1024 / PAGE_SIZE;
419 vm.flags = VM_ALLOC;
420 vm.size = ALIGN(sizeof(unsigned long) * max(xen_max_p2m_pfn, p2m_limit),
421 PMD_SIZE * PMDS_PER_MID_PAGE);
422 vm_area_register_early(&vm, PMD_SIZE * PMDS_PER_MID_PAGE);
423 pr_notice("p2m virtual area at %p, size is %lx\n", vm.addr, vm.size);
424
425 xen_max_p2m_pfn = vm.size / sizeof(unsigned long);
426
427 xen_rebuild_p2m_list(vm.addr);
428
429 xen_p2m_addr = vm.addr;
430 xen_p2m_size = xen_max_p2m_pfn;
431
432 xen_inv_extra_mem();
433}
434
435unsigned long get_phys_to_machine(unsigned long pfn)
436{
437 pte_t *ptep;
438 unsigned int level;
439
440 if (unlikely(pfn >= xen_p2m_size)) {
441 if (pfn < xen_max_p2m_pfn)
442 return xen_chk_extra_mem(pfn);
443
444 return IDENTITY_FRAME(pfn);
445 }
446
447 ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn), &level);
448 BUG_ON(!ptep || level != PG_LEVEL_4K);
449
450
451
452
453
454
455 if (pte_pfn(*ptep) == PFN_DOWN(__pa(p2m_identity)))
456 return IDENTITY_FRAME(pfn);
457
458 return xen_p2m_addr[pfn];
459}
460EXPORT_SYMBOL_GPL(get_phys_to_machine);
461
462
463
464
465
466
467
468static pte_t *alloc_p2m_pmd(unsigned long addr, pte_t *pte_pg)
469{
470 pte_t *ptechk;
471 pte_t *pte_newpg[PMDS_PER_MID_PAGE];
472 pmd_t *pmdp;
473 unsigned int level;
474 unsigned long flags;
475 unsigned long vaddr;
476 int i;
477
478
479 for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
480 pte_newpg[i] = alloc_p2m_page();
481 if (!pte_newpg[i]) {
482 for (i--; i >= 0; i--)
483 free_p2m_page(pte_newpg[i]);
484
485 return NULL;
486 }
487 }
488
489 vaddr = addr & ~(PMD_SIZE * PMDS_PER_MID_PAGE - 1);
490
491 for (i = 0; i < PMDS_PER_MID_PAGE; i++) {
492 copy_page(pte_newpg[i], pte_pg);
493 paravirt_alloc_pte(&init_mm, __pa(pte_newpg[i]) >> PAGE_SHIFT);
494
495 pmdp = lookup_pmd_address(vaddr);
496 BUG_ON(!pmdp);
497
498 spin_lock_irqsave(&p2m_update_lock, flags);
499
500 ptechk = lookup_address(vaddr, &level);
501 if (ptechk == pte_pg) {
502 HYPERVISOR_shared_info->arch.p2m_generation++;
503 wmb();
504 set_pmd(pmdp,
505 __pmd(__pa(pte_newpg[i]) | _KERNPG_TABLE));
506 wmb();
507 HYPERVISOR_shared_info->arch.p2m_generation++;
508 pte_newpg[i] = NULL;
509 }
510
511 spin_unlock_irqrestore(&p2m_update_lock, flags);
512
513 if (pte_newpg[i]) {
514 paravirt_release_pte(__pa(pte_newpg[i]) >> PAGE_SHIFT);
515 free_p2m_page(pte_newpg[i]);
516 }
517
518 vaddr += PMD_SIZE;
519 }
520
521 return lookup_address(addr, &level);
522}
523
524
525
526
527
528
529
530
531int xen_alloc_p2m_entry(unsigned long pfn)
532{
533 unsigned topidx;
534 unsigned long *top_mfn_p, *mid_mfn;
535 pte_t *ptep, *pte_pg;
536 unsigned int level;
537 unsigned long flags;
538 unsigned long addr = (unsigned long)(xen_p2m_addr + pfn);
539 unsigned long p2m_pfn;
540
541 ptep = lookup_address(addr, &level);
542 BUG_ON(!ptep || level != PG_LEVEL_4K);
543 pte_pg = (pte_t *)((unsigned long)ptep & ~(PAGE_SIZE - 1));
544
545 if (pte_pg == p2m_missing_pte || pte_pg == p2m_identity_pte) {
546
547 ptep = alloc_p2m_pmd(addr, pte_pg);
548 if (!ptep)
549 return -ENOMEM;
550 }
551
552 if (p2m_top_mfn && pfn < MAX_P2M_PFN) {
553 topidx = p2m_top_index(pfn);
554 top_mfn_p = &p2m_top_mfn[topidx];
555 mid_mfn = READ_ONCE(p2m_top_mfn_p[topidx]);
556
557 BUG_ON(virt_to_mfn(mid_mfn) != *top_mfn_p);
558
559 if (mid_mfn == p2m_mid_missing_mfn) {
560
561 unsigned long missing_mfn;
562 unsigned long mid_mfn_mfn;
563 unsigned long old_mfn;
564
565 mid_mfn = alloc_p2m_page();
566 if (!mid_mfn)
567 return -ENOMEM;
568
569 p2m_mid_mfn_init(mid_mfn, p2m_missing);
570
571 missing_mfn = virt_to_mfn(p2m_mid_missing_mfn);
572 mid_mfn_mfn = virt_to_mfn(mid_mfn);
573 old_mfn = cmpxchg(top_mfn_p, missing_mfn, mid_mfn_mfn);
574 if (old_mfn != missing_mfn) {
575 free_p2m_page(mid_mfn);
576 mid_mfn = mfn_to_virt(old_mfn);
577 } else {
578 p2m_top_mfn_p[topidx] = mid_mfn;
579 }
580 }
581 } else {
582 mid_mfn = NULL;
583 }
584
585 p2m_pfn = pte_pfn(READ_ONCE(*ptep));
586 if (p2m_pfn == PFN_DOWN(__pa(p2m_identity)) ||
587 p2m_pfn == PFN_DOWN(__pa(p2m_missing))) {
588
589 unsigned long *p2m;
590
591 p2m = alloc_p2m_page();
592 if (!p2m)
593 return -ENOMEM;
594
595 if (p2m_pfn == PFN_DOWN(__pa(p2m_missing)))
596 p2m_init(p2m);
597 else
598 p2m_init_identity(p2m, pfn & ~(P2M_PER_PAGE - 1));
599
600 spin_lock_irqsave(&p2m_update_lock, flags);
601
602 if (pte_pfn(*ptep) == p2m_pfn) {
603 HYPERVISOR_shared_info->arch.p2m_generation++;
604 wmb();
605 set_pte(ptep,
606 pfn_pte(PFN_DOWN(__pa(p2m)), PAGE_KERNEL));
607 wmb();
608 HYPERVISOR_shared_info->arch.p2m_generation++;
609 if (mid_mfn)
610 mid_mfn[p2m_mid_index(pfn)] = virt_to_mfn(p2m);
611 p2m = NULL;
612 }
613
614 spin_unlock_irqrestore(&p2m_update_lock, flags);
615
616 if (p2m)
617 free_p2m_page(p2m);
618 }
619
620
621 if (pfn > xen_p2m_last_pfn) {
622 xen_p2m_last_pfn = pfn;
623 HYPERVISOR_shared_info->arch.max_pfn = xen_p2m_last_pfn;
624 }
625
626 return 0;
627}
628EXPORT_SYMBOL(xen_alloc_p2m_entry);
629
630unsigned long __init set_phys_range_identity(unsigned long pfn_s,
631 unsigned long pfn_e)
632{
633 unsigned long pfn;
634
635 if (unlikely(pfn_s >= xen_p2m_size))
636 return 0;
637
638 if (pfn_s > pfn_e)
639 return 0;
640
641 if (pfn_e > xen_p2m_size)
642 pfn_e = xen_p2m_size;
643
644 for (pfn = pfn_s; pfn < pfn_e; pfn++)
645 xen_p2m_addr[pfn] = IDENTITY_FRAME(pfn);
646
647 return pfn - pfn_s;
648}
649
650bool __set_phys_to_machine(unsigned long pfn, unsigned long mfn)
651{
652 pte_t *ptep;
653 unsigned int level;
654
655
656 if (unlikely(pfn >= xen_p2m_size))
657 return mfn == INVALID_P2M_ENTRY;
658
659
660
661
662
663 if (likely(!xen_safe_write_ulong(xen_p2m_addr + pfn, mfn)))
664 return true;
665
666 ptep = lookup_address((unsigned long)(xen_p2m_addr + pfn), &level);
667 BUG_ON(!ptep || level != PG_LEVEL_4K);
668
669 if (pte_pfn(*ptep) == PFN_DOWN(__pa(p2m_missing)))
670 return mfn == INVALID_P2M_ENTRY;
671
672 if (pte_pfn(*ptep) == PFN_DOWN(__pa(p2m_identity)))
673 return mfn == IDENTITY_FRAME(pfn);
674
675 return false;
676}
677
678bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
679{
680 if (unlikely(!__set_phys_to_machine(pfn, mfn))) {
681 int ret;
682
683 ret = xen_alloc_p2m_entry(pfn);
684 if (ret < 0)
685 return false;
686
687 return __set_phys_to_machine(pfn, mfn);
688 }
689
690 return true;
691}
692
693int set_foreign_p2m_mapping(struct gnttab_map_grant_ref *map_ops,
694 struct gnttab_map_grant_ref *kmap_ops,
695 struct page **pages, unsigned int count)
696{
697 int i, ret = 0;
698 pte_t *pte;
699
700 if (xen_feature(XENFEAT_auto_translated_physmap))
701 return 0;
702
703 if (kmap_ops) {
704 ret = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref,
705 kmap_ops, count);
706 if (ret)
707 goto out;
708 }
709
710 for (i = 0; i < count; i++) {
711 unsigned long mfn, pfn;
712 struct gnttab_unmap_grant_ref unmap[2];
713 int rc;
714
715
716 if (map_ops[i].status != GNTST_okay ||
717 (kmap_ops && kmap_ops[i].status != GNTST_okay))
718 continue;
719
720 if (map_ops[i].flags & GNTMAP_contains_pte) {
721 pte = (pte_t *)(mfn_to_virt(PFN_DOWN(map_ops[i].host_addr)) +
722 (map_ops[i].host_addr & ~PAGE_MASK));
723 mfn = pte_mfn(*pte);
724 } else {
725 mfn = PFN_DOWN(map_ops[i].dev_bus_addr);
726 }
727 pfn = page_to_pfn(pages[i]);
728
729 WARN(pfn_to_mfn(pfn) != INVALID_P2M_ENTRY, "page must be ballooned");
730
731 if (likely(set_phys_to_machine(pfn, FOREIGN_FRAME(mfn))))
732 continue;
733
734
735
736
737
738 map_ops[i].status = GNTST_general_error;
739 unmap[0].host_addr = map_ops[i].host_addr,
740 unmap[0].handle = map_ops[i].handle;
741 map_ops[i].handle = INVALID_GRANT_HANDLE;
742 if (map_ops[i].flags & GNTMAP_device_map)
743 unmap[0].dev_bus_addr = map_ops[i].dev_bus_addr;
744 else
745 unmap[0].dev_bus_addr = 0;
746
747 if (kmap_ops) {
748 kmap_ops[i].status = GNTST_general_error;
749 unmap[1].host_addr = kmap_ops[i].host_addr,
750 unmap[1].handle = kmap_ops[i].handle;
751 kmap_ops[i].handle = INVALID_GRANT_HANDLE;
752 if (kmap_ops[i].flags & GNTMAP_device_map)
753 unmap[1].dev_bus_addr = kmap_ops[i].dev_bus_addr;
754 else
755 unmap[1].dev_bus_addr = 0;
756 }
757
758
759
760
761
762 unmap[0].status = 1;
763 unmap[1].status = 1;
764
765 rc = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
766 unmap, 1 + !!kmap_ops);
767 if (rc || unmap[0].status != GNTST_okay ||
768 unmap[1].status != GNTST_okay)
769 pr_err_once("gnttab unmap failed: rc=%d st0=%d st1=%d\n",
770 rc, unmap[0].status, unmap[1].status);
771 }
772
773out:
774 return ret;
775}
776
777int clear_foreign_p2m_mapping(struct gnttab_unmap_grant_ref *unmap_ops,
778 struct gnttab_unmap_grant_ref *kunmap_ops,
779 struct page **pages, unsigned int count)
780{
781 int i, ret = 0;
782
783 if (xen_feature(XENFEAT_auto_translated_physmap))
784 return 0;
785
786 for (i = 0; i < count; i++) {
787 unsigned long mfn = __pfn_to_mfn(page_to_pfn(pages[i]));
788 unsigned long pfn = page_to_pfn(pages[i]);
789
790 if (mfn != INVALID_P2M_ENTRY && (mfn & FOREIGN_FRAME_BIT))
791 set_phys_to_machine(pfn, INVALID_P2M_ENTRY);
792 else
793 ret = -EINVAL;
794 }
795 if (kunmap_ops)
796 ret = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref,
797 kunmap_ops, count) ?: ret;
798
799 return ret;
800}
801
802#ifdef CONFIG_XEN_DEBUG_FS
803#include <linux/debugfs.h>
804#include "debugfs.h"
805static int p2m_dump_show(struct seq_file *m, void *v)
806{
807 static const char * const type_name[] = {
808 [P2M_TYPE_IDENTITY] = "identity",
809 [P2M_TYPE_MISSING] = "missing",
810 [P2M_TYPE_PFN] = "pfn",
811 [P2M_TYPE_UNKNOWN] = "abnormal"};
812 unsigned long pfn, first_pfn;
813 int type, prev_type;
814
815 prev_type = xen_p2m_elem_type(0);
816 first_pfn = 0;
817
818 for (pfn = 0; pfn < xen_p2m_size; pfn++) {
819 type = xen_p2m_elem_type(pfn);
820 if (type != prev_type) {
821 seq_printf(m, " [0x%lx->0x%lx] %s\n", first_pfn, pfn,
822 type_name[prev_type]);
823 prev_type = type;
824 first_pfn = pfn;
825 }
826 }
827 seq_printf(m, " [0x%lx->0x%lx] %s\n", first_pfn, pfn,
828 type_name[prev_type]);
829 return 0;
830}
831
832DEFINE_SHOW_ATTRIBUTE(p2m_dump);
833
834static struct dentry *d_mmu_debug;
835
836static int __init xen_p2m_debugfs(void)
837{
838 struct dentry *d_xen = xen_init_debugfs();
839
840 d_mmu_debug = debugfs_create_dir("mmu", d_xen);
841
842 debugfs_create_file("p2m", 0600, d_mmu_debug, NULL, &p2m_dump_fops);
843 return 0;
844}
845fs_initcall(xen_p2m_debugfs);
846#endif
847