1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_H
3 #define _ASM_X86_PGTABLE_H
5 #include <linux/mem_encrypt.h>
7 #include <asm/pgtable_types.h>
10 * Macro to mark a page protection value as UC-
12 #define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 > 3) \
14 ? (__pgprot(pgprot_val(prot) | \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
19 #include <linux/spinlock.h>
20 #include <asm/x86_init.h>
22 #include <asm/fpu/api.h>
24 #include <asm-generic/pgtable_uffd.h>
25 #include <linux/page_table_check.h>
27 extern pgd_t early_top_pgt[PTRS_PER_PGD];
28 bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
30 void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
31 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
33 void ptdump_walk_pgd_level_checkwx(void);
34 void ptdump_walk_user_pgd_level_checkwx(void);
37 * Macros to add or remove encryption attribute
39 #define pgprot_encrypted(prot) __pgprot(cc_mkenc(pgprot_val(prot)))
40 #define pgprot_decrypted(prot) __pgprot(cc_mkdec(pgprot_val(prot)))
42 #ifdef CONFIG_DEBUG_WX
43 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
44 #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
46 #define debug_checkwx() do { } while (0)
47 #define debug_checkwx_user() do { } while (0)
51 * ZERO_PAGE is a global shared page that is always zero: used
52 * for zero-mapped memory areas etc..
54 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
56 #define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page))
58 extern spinlock_t pgd_lock;
59 extern struct list_head pgd_list;
61 extern struct mm_struct *pgd_page_get_mm(struct page *page);
63 extern pmdval_t early_pmd_flags;
65 #ifdef CONFIG_PARAVIRT_XXL
66 #include <asm/paravirt.h>
67 #else /* !CONFIG_PARAVIRT_XXL */
68 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
70 #define set_pte_atomic(ptep, pte) \
71 native_set_pte_atomic(ptep, pte)
73 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
75 #ifndef __PAGETABLE_P4D_FOLDED
76 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
77 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
81 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
84 #ifndef __PAGETABLE_PUD_FOLDED
85 #define p4d_clear(p4d) native_p4d_clear(p4d)
89 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
92 #ifndef __PAGETABLE_PUD_FOLDED
93 #define pud_clear(pud) native_pud_clear(pud)
96 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
97 #define pmd_clear(pmd) native_pmd_clear(pmd)
99 #define pgd_val(x) native_pgd_val(x)
100 #define __pgd(x) native_make_pgd(x)
102 #ifndef __PAGETABLE_P4D_FOLDED
103 #define p4d_val(x) native_p4d_val(x)
104 #define __p4d(x) native_make_p4d(x)
107 #ifndef __PAGETABLE_PUD_FOLDED
108 #define pud_val(x) native_pud_val(x)
109 #define __pud(x) native_make_pud(x)
112 #ifndef __PAGETABLE_PMD_FOLDED
113 #define pmd_val(x) native_pmd_val(x)
114 #define __pmd(x) native_make_pmd(x)
117 #define pte_val(x) native_pte_val(x)
118 #define __pte(x) native_make_pte(x)
120 #define arch_end_context_switch(prev) do {} while(0)
121 #endif /* CONFIG_PARAVIRT_XXL */
124 * The following only work if pte_present() is true.
125 * Undefined behaviour if not..
127 static inline int pte_dirty(pte_t pte)
129 return pte_flags(pte) & _PAGE_DIRTY;
132 static inline int pte_young(pte_t pte)
134 return pte_flags(pte) & _PAGE_ACCESSED;
137 static inline int pmd_dirty(pmd_t pmd)
139 return pmd_flags(pmd) & _PAGE_DIRTY;
142 #define pmd_young pmd_young
143 static inline int pmd_young(pmd_t pmd)
145 return pmd_flags(pmd) & _PAGE_ACCESSED;
148 static inline int pud_dirty(pud_t pud)
150 return pud_flags(pud) & _PAGE_DIRTY;
153 static inline int pud_young(pud_t pud)
155 return pud_flags(pud) & _PAGE_ACCESSED;
158 static inline int pte_write(pte_t pte)
160 return pte_flags(pte) & _PAGE_RW;
163 static inline int pte_huge(pte_t pte)
165 return pte_flags(pte) & _PAGE_PSE;
168 static inline int pte_global(pte_t pte)
170 return pte_flags(pte) & _PAGE_GLOBAL;
173 static inline int pte_exec(pte_t pte)
175 return !(pte_flags(pte) & _PAGE_NX);
178 static inline int pte_special(pte_t pte)
180 return pte_flags(pte) & _PAGE_SPECIAL;
183 /* Entries that were set to PROT_NONE are inverted */
185 static inline u64 protnone_mask(u64 val);
187 static inline unsigned long pte_pfn(pte_t pte)
189 phys_addr_t pfn = pte_val(pte);
190 pfn ^= protnone_mask(pfn);
191 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
194 static inline unsigned long pmd_pfn(pmd_t pmd)
196 phys_addr_t pfn = pmd_val(pmd);
197 pfn ^= protnone_mask(pfn);
198 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
201 static inline unsigned long pud_pfn(pud_t pud)
203 phys_addr_t pfn = pud_val(pud);
204 pfn ^= protnone_mask(pfn);
205 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
208 static inline unsigned long p4d_pfn(p4d_t p4d)
210 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
213 static inline unsigned long pgd_pfn(pgd_t pgd)
215 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
218 #define p4d_leaf p4d_large
219 static inline int p4d_large(p4d_t p4d)
221 /* No 512 GiB pages yet */
225 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
227 #define pmd_leaf pmd_large
228 static inline int pmd_large(pmd_t pte)
230 return pmd_flags(pte) & _PAGE_PSE;
233 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
234 /* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_large */
235 static inline int pmd_trans_huge(pmd_t pmd)
237 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
240 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
241 static inline int pud_trans_huge(pud_t pud)
243 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
247 #define has_transparent_hugepage has_transparent_hugepage
248 static inline int has_transparent_hugepage(void)
250 return boot_cpu_has(X86_FEATURE_PSE);
253 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
254 static inline int pmd_devmap(pmd_t pmd)
256 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
259 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
260 static inline int pud_devmap(pud_t pud)
262 return !!(pud_val(pud) & _PAGE_DEVMAP);
265 static inline int pud_devmap(pud_t pud)
271 static inline int pgd_devmap(pgd_t pgd)
276 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
278 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
280 pteval_t v = native_pte_val(pte);
282 return native_make_pte(v | set);
285 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
287 pteval_t v = native_pte_val(pte);
289 return native_make_pte(v & ~clear);
292 static inline pte_t pte_wrprotect(pte_t pte)
294 return pte_clear_flags(pte, _PAGE_RW);
297 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
298 static inline int pte_uffd_wp(pte_t pte)
300 bool wp = pte_flags(pte) & _PAGE_UFFD_WP;
302 #ifdef CONFIG_DEBUG_VM
304 * Having write bit for wr-protect-marked present ptes is fatal,
305 * because it means the uffd-wp bit will be ignored and write will
308 * Use any chance of pgtable walking to verify this (e.g., when
309 * page swapped out or being migrated for all purposes). It means
310 * something is already wrong. Tell the admin even before the
311 * process crashes. We also nail it with wrong pgtable setup.
313 WARN_ON_ONCE(wp && pte_write(pte));
319 static inline pte_t pte_mkuffd_wp(pte_t pte)
321 return pte_wrprotect(pte_set_flags(pte, _PAGE_UFFD_WP));
324 static inline pte_t pte_clear_uffd_wp(pte_t pte)
326 return pte_clear_flags(pte, _PAGE_UFFD_WP);
328 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
330 static inline pte_t pte_mkclean(pte_t pte)
332 return pte_clear_flags(pte, _PAGE_DIRTY);
335 static inline pte_t pte_mkold(pte_t pte)
337 return pte_clear_flags(pte, _PAGE_ACCESSED);
340 static inline pte_t pte_mkexec(pte_t pte)
342 return pte_clear_flags(pte, _PAGE_NX);
345 static inline pte_t pte_mkdirty(pte_t pte)
347 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
350 static inline pte_t pte_mkyoung(pte_t pte)
352 return pte_set_flags(pte, _PAGE_ACCESSED);
355 static inline pte_t pte_mkwrite(pte_t pte)
357 return pte_set_flags(pte, _PAGE_RW);
360 static inline pte_t pte_mkhuge(pte_t pte)
362 return pte_set_flags(pte, _PAGE_PSE);
365 static inline pte_t pte_clrhuge(pte_t pte)
367 return pte_clear_flags(pte, _PAGE_PSE);
370 static inline pte_t pte_mkglobal(pte_t pte)
372 return pte_set_flags(pte, _PAGE_GLOBAL);
375 static inline pte_t pte_clrglobal(pte_t pte)
377 return pte_clear_flags(pte, _PAGE_GLOBAL);
380 static inline pte_t pte_mkspecial(pte_t pte)
382 return pte_set_flags(pte, _PAGE_SPECIAL);
385 static inline pte_t pte_mkdevmap(pte_t pte)
387 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
390 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
392 pmdval_t v = native_pmd_val(pmd);
394 return native_make_pmd(v | set);
397 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
399 pmdval_t v = native_pmd_val(pmd);
401 return native_make_pmd(v & ~clear);
404 static inline pmd_t pmd_wrprotect(pmd_t pmd)
406 return pmd_clear_flags(pmd, _PAGE_RW);
409 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
410 static inline int pmd_uffd_wp(pmd_t pmd)
412 return pmd_flags(pmd) & _PAGE_UFFD_WP;
415 static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
417 return pmd_wrprotect(pmd_set_flags(pmd, _PAGE_UFFD_WP));
420 static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
422 return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
424 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
426 static inline pmd_t pmd_mkold(pmd_t pmd)
428 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
431 static inline pmd_t pmd_mkclean(pmd_t pmd)
433 return pmd_clear_flags(pmd, _PAGE_DIRTY);
436 static inline pmd_t pmd_mkdirty(pmd_t pmd)
438 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
441 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
443 return pmd_set_flags(pmd, _PAGE_DEVMAP);
446 static inline pmd_t pmd_mkhuge(pmd_t pmd)
448 return pmd_set_flags(pmd, _PAGE_PSE);
451 static inline pmd_t pmd_mkyoung(pmd_t pmd)
453 return pmd_set_flags(pmd, _PAGE_ACCESSED);
456 static inline pmd_t pmd_mkwrite(pmd_t pmd)
458 return pmd_set_flags(pmd, _PAGE_RW);
461 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
463 pudval_t v = native_pud_val(pud);
465 return native_make_pud(v | set);
468 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
470 pudval_t v = native_pud_val(pud);
472 return native_make_pud(v & ~clear);
475 static inline pud_t pud_mkold(pud_t pud)
477 return pud_clear_flags(pud, _PAGE_ACCESSED);
480 static inline pud_t pud_mkclean(pud_t pud)
482 return pud_clear_flags(pud, _PAGE_DIRTY);
485 static inline pud_t pud_wrprotect(pud_t pud)
487 return pud_clear_flags(pud, _PAGE_RW);
490 static inline pud_t pud_mkdirty(pud_t pud)
492 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
495 static inline pud_t pud_mkdevmap(pud_t pud)
497 return pud_set_flags(pud, _PAGE_DEVMAP);
500 static inline pud_t pud_mkhuge(pud_t pud)
502 return pud_set_flags(pud, _PAGE_PSE);
505 static inline pud_t pud_mkyoung(pud_t pud)
507 return pud_set_flags(pud, _PAGE_ACCESSED);
510 static inline pud_t pud_mkwrite(pud_t pud)
512 return pud_set_flags(pud, _PAGE_RW);
515 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
516 static inline int pte_soft_dirty(pte_t pte)
518 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
521 static inline int pmd_soft_dirty(pmd_t pmd)
523 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
526 static inline int pud_soft_dirty(pud_t pud)
528 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
531 static inline pte_t pte_mksoft_dirty(pte_t pte)
533 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
536 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
538 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
541 static inline pud_t pud_mksoft_dirty(pud_t pud)
543 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
546 static inline pte_t pte_clear_soft_dirty(pte_t pte)
548 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
551 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
553 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
556 static inline pud_t pud_clear_soft_dirty(pud_t pud)
558 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
561 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
564 * Mask out unsupported bits in a present pgprot. Non-present pgprots
565 * can use those bits for other purposes, so leave them be.
567 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
569 pgprotval_t protval = pgprot_val(pgprot);
571 if (protval & _PAGE_PRESENT)
572 protval &= __supported_pte_mask;
577 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
579 pgprotval_t massaged_val = massage_pgprot(pgprot);
581 /* mmdebug.h can not be included here because of dependencies */
582 #ifdef CONFIG_DEBUG_VM
583 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
584 "attempted to set unsupported pgprot: %016llx "
585 "bits: %016llx supported: %016llx\n",
586 (u64)pgprot_val(pgprot),
587 (u64)pgprot_val(pgprot) ^ massaged_val,
588 (u64)__supported_pte_mask);
594 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
596 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
597 pfn ^= protnone_mask(pgprot_val(pgprot));
599 return __pte(pfn | check_pgprot(pgprot));
602 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
604 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
605 pfn ^= protnone_mask(pgprot_val(pgprot));
606 pfn &= PHYSICAL_PMD_PAGE_MASK;
607 return __pmd(pfn | check_pgprot(pgprot));
610 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
612 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
613 pfn ^= protnone_mask(pgprot_val(pgprot));
614 pfn &= PHYSICAL_PUD_PAGE_MASK;
615 return __pud(pfn | check_pgprot(pgprot));
618 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
620 return pfn_pmd(pmd_pfn(pmd),
621 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
624 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
626 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
628 pteval_t val = pte_val(pte), oldval = val;
631 * Chop off the NX bit (if present), and add the NX portion of
632 * the newprot (if present):
634 val &= _PAGE_CHG_MASK;
635 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
636 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
640 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
642 pmdval_t val = pmd_val(pmd), oldval = val;
644 val &= _HPAGE_CHG_MASK;
645 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
646 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
651 * mprotect needs to preserve PAT and encryption bits when updating
654 #define pgprot_modify pgprot_modify
655 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
657 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
658 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
659 return __pgprot(preservebits | addbits);
662 #define pte_pgprot(x) __pgprot(pte_flags(x))
663 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
664 #define pud_pgprot(x) __pgprot(pud_flags(x))
665 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
667 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
669 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
670 enum page_cache_mode pcm,
671 enum page_cache_mode new_pcm)
674 * PAT type is always WB for untracked ranges, so no need to check.
676 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
680 * Certain new memtypes are not allowed with certain
682 * - request is uncached, return cannot be write-back
683 * - request is write-combine, return cannot be write-back
684 * - request is write-through, return cannot be write-back
685 * - request is write-through, return cannot be write-combine
687 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
688 new_pcm == _PAGE_CACHE_MODE_WB) ||
689 (pcm == _PAGE_CACHE_MODE_WC &&
690 new_pcm == _PAGE_CACHE_MODE_WB) ||
691 (pcm == _PAGE_CACHE_MODE_WT &&
692 new_pcm == _PAGE_CACHE_MODE_WB) ||
693 (pcm == _PAGE_CACHE_MODE_WT &&
694 new_pcm == _PAGE_CACHE_MODE_WC)) {
701 pmd_t *populate_extra_pmd(unsigned long vaddr);
702 pte_t *populate_extra_pte(unsigned long vaddr);
704 #ifdef CONFIG_PAGE_TABLE_ISOLATION
705 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
708 * Take a PGD location (pgdp) and a pgd value that needs to be set there.
709 * Populates the user and returns the resulting PGD that must be set in
710 * the kernel copy of the page tables.
712 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
714 if (!static_cpu_has(X86_FEATURE_PTI))
716 return __pti_set_user_pgtbl(pgdp, pgd);
718 #else /* CONFIG_PAGE_TABLE_ISOLATION */
719 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
723 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
725 #endif /* __ASSEMBLY__ */
729 # include <asm/pgtable_32.h>
731 # include <asm/pgtable_64.h>
735 #include <linux/mm_types.h>
736 #include <linux/mmdebug.h>
737 #include <linux/log2.h>
738 #include <asm/fixmap.h>
740 static inline int pte_none(pte_t pte)
742 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
745 #define __HAVE_ARCH_PTE_SAME
746 static inline int pte_same(pte_t a, pte_t b)
748 return a.pte == b.pte;
751 static inline int pte_present(pte_t a)
753 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
756 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
757 static inline int pte_devmap(pte_t a)
759 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
763 #define pte_accessible pte_accessible
764 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
766 if (pte_flags(a) & _PAGE_PRESENT)
769 if ((pte_flags(a) & _PAGE_PROTNONE) &&
770 atomic_read(&mm->tlb_flush_pending))
776 static inline int pmd_present(pmd_t pmd)
779 * Checking for _PAGE_PSE is needed too because
780 * split_huge_page will temporarily clear the present bit (but
781 * the _PAGE_PSE flag will remain set at all times while the
782 * _PAGE_PRESENT bit is clear).
784 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
787 #ifdef CONFIG_NUMA_BALANCING
789 * These work without NUMA balancing but the kernel does not care. See the
790 * comment in include/linux/pgtable.h
792 static inline int pte_protnone(pte_t pte)
794 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
798 static inline int pmd_protnone(pmd_t pmd)
800 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
803 #endif /* CONFIG_NUMA_BALANCING */
805 static inline int pmd_none(pmd_t pmd)
807 /* Only check low word on 32-bit platforms, since it might be
808 out of sync with upper half. */
809 unsigned long val = native_pmd_val(pmd);
810 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
813 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
815 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
819 * Currently stuck as a macro due to indirect forward reference to
820 * linux/mmzone.h's __section_mem_map_addr() definition:
822 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
825 * Conversion functions: convert a page and protection to a page entry,
826 * and a page entry and page directory to the page they refer to.
828 * (Currently stuck as a macro because of indirect forward reference
829 * to linux/mm.h:page_to_nid())
831 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
833 static inline int pmd_bad(pmd_t pmd)
835 return (pmd_flags(pmd) & ~(_PAGE_USER | _PAGE_ACCESSED)) !=
836 (_KERNPG_TABLE & ~_PAGE_ACCESSED);
839 static inline unsigned long pages_to_mb(unsigned long npg)
841 return npg >> (20 - PAGE_SHIFT);
844 #if CONFIG_PGTABLE_LEVELS > 2
845 static inline int pud_none(pud_t pud)
847 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
850 static inline int pud_present(pud_t pud)
852 return pud_flags(pud) & _PAGE_PRESENT;
855 static inline pmd_t *pud_pgtable(pud_t pud)
857 return (pmd_t *)__va(pud_val(pud) & pud_pfn_mask(pud));
861 * Currently stuck as a macro due to indirect forward reference to
862 * linux/mmzone.h's __section_mem_map_addr() definition:
864 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
866 #define pud_leaf pud_large
867 static inline int pud_large(pud_t pud)
869 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
870 (_PAGE_PSE | _PAGE_PRESENT);
873 static inline int pud_bad(pud_t pud)
875 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
878 #define pud_leaf pud_large
879 static inline int pud_large(pud_t pud)
883 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
885 #if CONFIG_PGTABLE_LEVELS > 3
886 static inline int p4d_none(p4d_t p4d)
888 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
891 static inline int p4d_present(p4d_t p4d)
893 return p4d_flags(p4d) & _PAGE_PRESENT;
896 static inline pud_t *p4d_pgtable(p4d_t p4d)
898 return (pud_t *)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
902 * Currently stuck as a macro due to indirect forward reference to
903 * linux/mmzone.h's __section_mem_map_addr() definition:
905 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
907 static inline int p4d_bad(p4d_t p4d)
909 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
911 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
912 ignore_flags |= _PAGE_NX;
914 return (p4d_flags(p4d) & ~ignore_flags) != 0;
916 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
918 static inline unsigned long p4d_index(unsigned long address)
920 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
923 #if CONFIG_PGTABLE_LEVELS > 4
924 static inline int pgd_present(pgd_t pgd)
926 if (!pgtable_l5_enabled())
928 return pgd_flags(pgd) & _PAGE_PRESENT;
931 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
933 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
937 * Currently stuck as a macro due to indirect forward reference to
938 * linux/mmzone.h's __section_mem_map_addr() definition:
940 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
942 /* to find an entry in a page-table-directory. */
943 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
945 if (!pgtable_l5_enabled())
947 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
950 static inline int pgd_bad(pgd_t pgd)
952 unsigned long ignore_flags = _PAGE_USER;
954 if (!pgtable_l5_enabled())
957 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
958 ignore_flags |= _PAGE_NX;
960 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
963 static inline int pgd_none(pgd_t pgd)
965 if (!pgtable_l5_enabled())
968 * There is no need to do a workaround for the KNL stray
969 * A/D bit erratum here. PGDs only point to page tables
970 * except on 32-bit non-PAE which is not supported on
973 return !native_pgd_val(pgd);
975 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
977 #endif /* __ASSEMBLY__ */
979 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
980 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
984 extern int direct_gbpages;
985 void init_mem_mapping(void);
986 void early_alloc_pgt_buf(void);
987 extern void memblock_find_dma_reserve(void);
988 void __init poking_init(void);
989 unsigned long init_memory_mapping(unsigned long start,
990 unsigned long end, pgprot_t prot);
993 extern pgd_t trampoline_pgd_entry;
996 /* local pte updates need not use xchg for locking */
997 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
1001 /* Pure native function needs no input for mm, addr */
1002 native_pte_clear(NULL, 0, ptep);
1006 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
1010 native_pmd_clear(pmdp);
1014 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1018 native_pud_clear(pudp);
1022 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1023 pte_t *ptep, pte_t pte)
1025 page_table_check_pte_set(mm, addr, ptep, pte);
1029 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1030 pmd_t *pmdp, pmd_t pmd)
1032 page_table_check_pmd_set(mm, addr, pmdp, pmd);
1036 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1037 pud_t *pudp, pud_t pud)
1039 page_table_check_pud_set(mm, addr, pudp, pud);
1040 native_set_pud(pudp, pud);
1044 * We only update the dirty/accessed state if we set
1045 * the dirty bit by hand in the kernel, since the hardware
1046 * will do the accessed bit for us, and we don't want to
1047 * race with other CPU's that might be updating the dirty
1048 * bit at the same time.
1050 struct vm_area_struct;
1052 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1053 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1054 unsigned long address, pte_t *ptep,
1055 pte_t entry, int dirty);
1057 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1058 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1059 unsigned long addr, pte_t *ptep);
1061 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1062 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1063 unsigned long address, pte_t *ptep);
1065 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1066 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1069 pte_t pte = native_ptep_get_and_clear(ptep);
1070 page_table_check_pte_clear(mm, addr, pte);
1074 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1075 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1076 unsigned long addr, pte_t *ptep,
1082 * Full address destruction in progress; paravirt does not
1083 * care about updates and native needs no locking
1085 pte = native_local_ptep_get_and_clear(ptep);
1086 page_table_check_pte_clear(mm, addr, pte);
1088 pte = ptep_get_and_clear(mm, addr, ptep);
1093 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1094 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1095 unsigned long addr, pte_t *ptep)
1097 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1100 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1102 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1104 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1105 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1106 unsigned long address, pmd_t *pmdp,
1107 pmd_t entry, int dirty);
1108 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1109 unsigned long address, pud_t *pudp,
1110 pud_t entry, int dirty);
1112 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1113 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1114 unsigned long addr, pmd_t *pmdp);
1115 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1116 unsigned long addr, pud_t *pudp);
1118 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1119 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1120 unsigned long address, pmd_t *pmdp);
1123 #define pmd_write pmd_write
1124 static inline int pmd_write(pmd_t pmd)
1126 return pmd_flags(pmd) & _PAGE_RW;
1129 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1130 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1133 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
1135 page_table_check_pmd_clear(mm, addr, pmd);
1140 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1141 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1142 unsigned long addr, pud_t *pudp)
1144 pud_t pud = native_pudp_get_and_clear(pudp);
1146 page_table_check_pud_clear(mm, addr, pud);
1151 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1152 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1153 unsigned long addr, pmd_t *pmdp)
1155 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1158 #define pud_write pud_write
1159 static inline int pud_write(pud_t pud)
1161 return pud_flags(pud) & _PAGE_RW;
1164 #ifndef pmdp_establish
1165 #define pmdp_establish pmdp_establish
1166 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1167 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1169 page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
1170 if (IS_ENABLED(CONFIG_SMP)) {
1171 return xchg(pmdp, pmd);
1174 WRITE_ONCE(*pmdp, pmd);
1180 #define __HAVE_ARCH_PMDP_INVALIDATE_AD
1181 extern pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma,
1182 unsigned long address, pmd_t *pmdp);
1185 * Page table pages are page-aligned. The lower half of the top
1186 * level is used for userspace and the top half for the kernel.
1188 * Returns true for parts of the PGD that map userspace and
1189 * false for the parts that map the kernel.
1191 static inline bool pgdp_maps_userspace(void *__ptr)
1193 unsigned long ptr = (unsigned long)__ptr;
1195 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1198 #define pgd_leaf pgd_large
1199 static inline int pgd_large(pgd_t pgd) { return 0; }
1201 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1203 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1204 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1205 * the user one is in the last 4k. To switch between them, you
1206 * just need to flip the 12th bit in their addresses.
1208 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1211 * This generates better code than the inline assembly in
1214 static inline void *ptr_set_bit(void *ptr, int bit)
1216 unsigned long __ptr = (unsigned long)ptr;
1219 return (void *)__ptr;
1221 static inline void *ptr_clear_bit(void *ptr, int bit)
1223 unsigned long __ptr = (unsigned long)ptr;
1226 return (void *)__ptr;
1229 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1231 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1234 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1236 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1239 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1241 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1244 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1246 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1248 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1251 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1253 * dst - pointer to pgd range anywhere on a pgd page
1255 * count - the number of pgds to copy.
1257 * dst and src can be on the same page, but the range must not overlap,
1258 * and must not cross a page boundary.
1260 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1262 memcpy(dst, src, count * sizeof(pgd_t));
1263 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1264 if (!static_cpu_has(X86_FEATURE_PTI))
1266 /* Clone the user space pgd as well */
1267 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1268 count * sizeof(pgd_t));
1272 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1273 static inline int page_level_shift(enum pg_level level)
1275 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1277 static inline unsigned long page_level_size(enum pg_level level)
1279 return 1UL << page_level_shift(level);
1281 static inline unsigned long page_level_mask(enum pg_level level)
1283 return ~(page_level_size(level) - 1);
1287 * The x86 doesn't have any external MMU info: the kernel page
1288 * tables contain all the necessary information.
1290 static inline void update_mmu_cache(struct vm_area_struct *vma,
1291 unsigned long addr, pte_t *ptep)
1294 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1295 unsigned long addr, pmd_t *pmd)
1298 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1299 unsigned long addr, pud_t *pud)
1302 static inline pte_t pte_swp_mkexclusive(pte_t pte)
1304 return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
1307 static inline int pte_swp_exclusive(pte_t pte)
1309 return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
1312 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
1314 return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
1317 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1318 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1320 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1323 static inline int pte_swp_soft_dirty(pte_t pte)
1325 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1328 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1330 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1333 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1334 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1336 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1339 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1341 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1344 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1346 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1351 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1352 static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1354 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1357 static inline int pte_swp_uffd_wp(pte_t pte)
1359 return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1362 static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1364 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1367 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1369 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1372 static inline int pmd_swp_uffd_wp(pmd_t pmd)
1374 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1377 static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1379 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1381 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
1383 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1385 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1386 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1387 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1393 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1395 u32 pkru = read_pkru();
1397 if (!__pkru_allows_read(pkru, pkey))
1399 if (write && !__pkru_allows_write(pkru, pkey))
1406 * 'pteval' can come from a PTE, PMD or PUD. We only check
1407 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1408 * same value on all 3 types.
1410 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1412 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1415 need_pte_bits |= _PAGE_RW;
1417 if ((pteval & need_pte_bits) != need_pte_bits)
1420 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1423 #define pte_access_permitted pte_access_permitted
1424 static inline bool pte_access_permitted(pte_t pte, bool write)
1426 return __pte_access_permitted(pte_val(pte), write);
1429 #define pmd_access_permitted pmd_access_permitted
1430 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1432 return __pte_access_permitted(pmd_val(pmd), write);
1435 #define pud_access_permitted pud_access_permitted
1436 static inline bool pud_access_permitted(pud_t pud, bool write)
1438 return __pte_access_permitted(pud_val(pud), write);
1441 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1442 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1444 static inline bool arch_has_pfn_modify_check(void)
1446 return boot_cpu_has_bug(X86_BUG_L1TF);
1449 #define arch_has_hw_pte_young arch_has_hw_pte_young
1450 static inline bool arch_has_hw_pte_young(void)
1455 #ifdef CONFIG_XEN_PV
1456 #define arch_has_hw_nonleaf_pmd_young arch_has_hw_nonleaf_pmd_young
1457 static inline bool arch_has_hw_nonleaf_pmd_young(void)
1459 return !cpu_feature_enabled(X86_FEATURE_XENPV);
1463 #ifdef CONFIG_PAGE_TABLE_CHECK
1464 static inline bool pte_user_accessible_page(pte_t pte)
1466 return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
1469 static inline bool pmd_user_accessible_page(pmd_t pmd)
1471 return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) && (pmd_val(pmd) & _PAGE_USER);
1474 static inline bool pud_user_accessible_page(pud_t pud)
1476 return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) && (pud_val(pud) & _PAGE_USER);
1480 #endif /* __ASSEMBLY__ */
1482 #endif /* _ASM_X86_PGTABLE_H */