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 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
293 static inline int pte_uffd_wp(pte_t pte)
295 return pte_flags(pte) & _PAGE_UFFD_WP;
298 static inline pte_t pte_mkuffd_wp(pte_t pte)
300 return pte_set_flags(pte, _PAGE_UFFD_WP);
303 static inline pte_t pte_clear_uffd_wp(pte_t pte)
305 return pte_clear_flags(pte, _PAGE_UFFD_WP);
307 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
309 static inline pte_t pte_mkclean(pte_t pte)
311 return pte_clear_flags(pte, _PAGE_DIRTY);
314 static inline pte_t pte_mkold(pte_t pte)
316 return pte_clear_flags(pte, _PAGE_ACCESSED);
319 static inline pte_t pte_wrprotect(pte_t pte)
321 return pte_clear_flags(pte, _PAGE_RW);
324 static inline pte_t pte_mkexec(pte_t pte)
326 return pte_clear_flags(pte, _PAGE_NX);
329 static inline pte_t pte_mkdirty(pte_t pte)
331 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
334 static inline pte_t pte_mkyoung(pte_t pte)
336 return pte_set_flags(pte, _PAGE_ACCESSED);
339 static inline pte_t pte_mkwrite(pte_t pte)
341 return pte_set_flags(pte, _PAGE_RW);
344 static inline pte_t pte_mkhuge(pte_t pte)
346 return pte_set_flags(pte, _PAGE_PSE);
349 static inline pte_t pte_clrhuge(pte_t pte)
351 return pte_clear_flags(pte, _PAGE_PSE);
354 static inline pte_t pte_mkglobal(pte_t pte)
356 return pte_set_flags(pte, _PAGE_GLOBAL);
359 static inline pte_t pte_clrglobal(pte_t pte)
361 return pte_clear_flags(pte, _PAGE_GLOBAL);
364 static inline pte_t pte_mkspecial(pte_t pte)
366 return pte_set_flags(pte, _PAGE_SPECIAL);
369 static inline pte_t pte_mkdevmap(pte_t pte)
371 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
374 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
376 pmdval_t v = native_pmd_val(pmd);
378 return native_make_pmd(v | set);
381 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
383 pmdval_t v = native_pmd_val(pmd);
385 return native_make_pmd(v & ~clear);
388 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
389 static inline int pmd_uffd_wp(pmd_t pmd)
391 return pmd_flags(pmd) & _PAGE_UFFD_WP;
394 static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
396 return pmd_set_flags(pmd, _PAGE_UFFD_WP);
399 static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
401 return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
403 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
405 static inline pmd_t pmd_mkold(pmd_t pmd)
407 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
410 static inline pmd_t pmd_mkclean(pmd_t pmd)
412 return pmd_clear_flags(pmd, _PAGE_DIRTY);
415 static inline pmd_t pmd_wrprotect(pmd_t pmd)
417 return pmd_clear_flags(pmd, _PAGE_RW);
420 static inline pmd_t pmd_mkdirty(pmd_t pmd)
422 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
425 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
427 return pmd_set_flags(pmd, _PAGE_DEVMAP);
430 static inline pmd_t pmd_mkhuge(pmd_t pmd)
432 return pmd_set_flags(pmd, _PAGE_PSE);
435 static inline pmd_t pmd_mkyoung(pmd_t pmd)
437 return pmd_set_flags(pmd, _PAGE_ACCESSED);
440 static inline pmd_t pmd_mkwrite(pmd_t pmd)
442 return pmd_set_flags(pmd, _PAGE_RW);
445 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
447 pudval_t v = native_pud_val(pud);
449 return native_make_pud(v | set);
452 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
454 pudval_t v = native_pud_val(pud);
456 return native_make_pud(v & ~clear);
459 static inline pud_t pud_mkold(pud_t pud)
461 return pud_clear_flags(pud, _PAGE_ACCESSED);
464 static inline pud_t pud_mkclean(pud_t pud)
466 return pud_clear_flags(pud, _PAGE_DIRTY);
469 static inline pud_t pud_wrprotect(pud_t pud)
471 return pud_clear_flags(pud, _PAGE_RW);
474 static inline pud_t pud_mkdirty(pud_t pud)
476 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
479 static inline pud_t pud_mkdevmap(pud_t pud)
481 return pud_set_flags(pud, _PAGE_DEVMAP);
484 static inline pud_t pud_mkhuge(pud_t pud)
486 return pud_set_flags(pud, _PAGE_PSE);
489 static inline pud_t pud_mkyoung(pud_t pud)
491 return pud_set_flags(pud, _PAGE_ACCESSED);
494 static inline pud_t pud_mkwrite(pud_t pud)
496 return pud_set_flags(pud, _PAGE_RW);
499 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
500 static inline int pte_soft_dirty(pte_t pte)
502 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
505 static inline int pmd_soft_dirty(pmd_t pmd)
507 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
510 static inline int pud_soft_dirty(pud_t pud)
512 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
515 static inline pte_t pte_mksoft_dirty(pte_t pte)
517 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
520 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
522 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
525 static inline pud_t pud_mksoft_dirty(pud_t pud)
527 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
530 static inline pte_t pte_clear_soft_dirty(pte_t pte)
532 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
535 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
537 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
540 static inline pud_t pud_clear_soft_dirty(pud_t pud)
542 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
545 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
548 * Mask out unsupported bits in a present pgprot. Non-present pgprots
549 * can use those bits for other purposes, so leave them be.
551 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
553 pgprotval_t protval = pgprot_val(pgprot);
555 if (protval & _PAGE_PRESENT)
556 protval &= __supported_pte_mask;
561 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
563 pgprotval_t massaged_val = massage_pgprot(pgprot);
565 /* mmdebug.h can not be included here because of dependencies */
566 #ifdef CONFIG_DEBUG_VM
567 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
568 "attempted to set unsupported pgprot: %016llx "
569 "bits: %016llx supported: %016llx\n",
570 (u64)pgprot_val(pgprot),
571 (u64)pgprot_val(pgprot) ^ massaged_val,
572 (u64)__supported_pte_mask);
578 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
580 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
581 pfn ^= protnone_mask(pgprot_val(pgprot));
583 return __pte(pfn | check_pgprot(pgprot));
586 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
588 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
589 pfn ^= protnone_mask(pgprot_val(pgprot));
590 pfn &= PHYSICAL_PMD_PAGE_MASK;
591 return __pmd(pfn | check_pgprot(pgprot));
594 static inline pud_t pfn_pud(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));
598 pfn &= PHYSICAL_PUD_PAGE_MASK;
599 return __pud(pfn | check_pgprot(pgprot));
602 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
604 return pfn_pmd(pmd_pfn(pmd),
605 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
608 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
610 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
612 pteval_t val = pte_val(pte), oldval = val;
615 * Chop off the NX bit (if present), and add the NX portion of
616 * the newprot (if present):
618 val &= _PAGE_CHG_MASK;
619 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
620 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
624 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
626 pmdval_t val = pmd_val(pmd), oldval = val;
628 val &= _HPAGE_CHG_MASK;
629 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
630 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
635 * mprotect needs to preserve PAT and encryption bits when updating
638 #define pgprot_modify pgprot_modify
639 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
641 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
642 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
643 return __pgprot(preservebits | addbits);
646 #define pte_pgprot(x) __pgprot(pte_flags(x))
647 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
648 #define pud_pgprot(x) __pgprot(pud_flags(x))
649 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
651 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
653 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
654 enum page_cache_mode pcm,
655 enum page_cache_mode new_pcm)
658 * PAT type is always WB for untracked ranges, so no need to check.
660 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
664 * Certain new memtypes are not allowed with certain
666 * - request is uncached, return cannot be write-back
667 * - request is write-combine, return cannot be write-back
668 * - request is write-through, return cannot be write-back
669 * - request is write-through, return cannot be write-combine
671 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
672 new_pcm == _PAGE_CACHE_MODE_WB) ||
673 (pcm == _PAGE_CACHE_MODE_WC &&
674 new_pcm == _PAGE_CACHE_MODE_WB) ||
675 (pcm == _PAGE_CACHE_MODE_WT &&
676 new_pcm == _PAGE_CACHE_MODE_WB) ||
677 (pcm == _PAGE_CACHE_MODE_WT &&
678 new_pcm == _PAGE_CACHE_MODE_WC)) {
685 pmd_t *populate_extra_pmd(unsigned long vaddr);
686 pte_t *populate_extra_pte(unsigned long vaddr);
688 #ifdef CONFIG_PAGE_TABLE_ISOLATION
689 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
692 * Take a PGD location (pgdp) and a pgd value that needs to be set there.
693 * Populates the user and returns the resulting PGD that must be set in
694 * the kernel copy of the page tables.
696 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
698 if (!static_cpu_has(X86_FEATURE_PTI))
700 return __pti_set_user_pgtbl(pgdp, pgd);
702 #else /* CONFIG_PAGE_TABLE_ISOLATION */
703 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
707 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
709 #endif /* __ASSEMBLY__ */
713 # include <asm/pgtable_32.h>
715 # include <asm/pgtable_64.h>
719 #include <linux/mm_types.h>
720 #include <linux/mmdebug.h>
721 #include <linux/log2.h>
722 #include <asm/fixmap.h>
724 static inline int pte_none(pte_t pte)
726 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
729 #define __HAVE_ARCH_PTE_SAME
730 static inline int pte_same(pte_t a, pte_t b)
732 return a.pte == b.pte;
735 static inline int pte_present(pte_t a)
737 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
740 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
741 static inline int pte_devmap(pte_t a)
743 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
747 #define pte_accessible pte_accessible
748 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
750 if (pte_flags(a) & _PAGE_PRESENT)
753 if ((pte_flags(a) & _PAGE_PROTNONE) &&
754 atomic_read(&mm->tlb_flush_pending))
760 static inline int pmd_present(pmd_t pmd)
763 * Checking for _PAGE_PSE is needed too because
764 * split_huge_page will temporarily clear the present bit (but
765 * the _PAGE_PSE flag will remain set at all times while the
766 * _PAGE_PRESENT bit is clear).
768 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
771 #ifdef CONFIG_NUMA_BALANCING
773 * These work without NUMA balancing but the kernel does not care. See the
774 * comment in include/linux/pgtable.h
776 static inline int pte_protnone(pte_t pte)
778 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
782 static inline int pmd_protnone(pmd_t pmd)
784 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
787 #endif /* CONFIG_NUMA_BALANCING */
789 static inline int pmd_none(pmd_t pmd)
791 /* Only check low word on 32-bit platforms, since it might be
792 out of sync with upper half. */
793 unsigned long val = native_pmd_val(pmd);
794 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
797 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
799 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
803 * Currently stuck as a macro due to indirect forward reference to
804 * linux/mmzone.h's __section_mem_map_addr() definition:
806 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
809 * Conversion functions: convert a page and protection to a page entry,
810 * and a page entry and page directory to the page they refer to.
812 * (Currently stuck as a macro because of indirect forward reference
813 * to linux/mm.h:page_to_nid())
815 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
817 static inline int pmd_bad(pmd_t pmd)
819 return (pmd_flags(pmd) & ~(_PAGE_USER | _PAGE_ACCESSED)) !=
820 (_KERNPG_TABLE & ~_PAGE_ACCESSED);
823 static inline unsigned long pages_to_mb(unsigned long npg)
825 return npg >> (20 - PAGE_SHIFT);
828 #if CONFIG_PGTABLE_LEVELS > 2
829 static inline int pud_none(pud_t pud)
831 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
834 static inline int pud_present(pud_t pud)
836 return pud_flags(pud) & _PAGE_PRESENT;
839 static inline pmd_t *pud_pgtable(pud_t pud)
841 return (pmd_t *)__va(pud_val(pud) & pud_pfn_mask(pud));
845 * Currently stuck as a macro due to indirect forward reference to
846 * linux/mmzone.h's __section_mem_map_addr() definition:
848 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
850 #define pud_leaf pud_large
851 static inline int pud_large(pud_t pud)
853 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
854 (_PAGE_PSE | _PAGE_PRESENT);
857 static inline int pud_bad(pud_t pud)
859 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
862 #define pud_leaf pud_large
863 static inline int pud_large(pud_t pud)
867 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
869 #if CONFIG_PGTABLE_LEVELS > 3
870 static inline int p4d_none(p4d_t p4d)
872 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
875 static inline int p4d_present(p4d_t p4d)
877 return p4d_flags(p4d) & _PAGE_PRESENT;
880 static inline pud_t *p4d_pgtable(p4d_t p4d)
882 return (pud_t *)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
886 * Currently stuck as a macro due to indirect forward reference to
887 * linux/mmzone.h's __section_mem_map_addr() definition:
889 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
891 static inline int p4d_bad(p4d_t p4d)
893 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
895 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
896 ignore_flags |= _PAGE_NX;
898 return (p4d_flags(p4d) & ~ignore_flags) != 0;
900 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
902 static inline unsigned long p4d_index(unsigned long address)
904 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
907 #if CONFIG_PGTABLE_LEVELS > 4
908 static inline int pgd_present(pgd_t pgd)
910 if (!pgtable_l5_enabled())
912 return pgd_flags(pgd) & _PAGE_PRESENT;
915 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
917 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
921 * Currently stuck as a macro due to indirect forward reference to
922 * linux/mmzone.h's __section_mem_map_addr() definition:
924 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
926 /* to find an entry in a page-table-directory. */
927 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
929 if (!pgtable_l5_enabled())
931 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
934 static inline int pgd_bad(pgd_t pgd)
936 unsigned long ignore_flags = _PAGE_USER;
938 if (!pgtable_l5_enabled())
941 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
942 ignore_flags |= _PAGE_NX;
944 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
947 static inline int pgd_none(pgd_t pgd)
949 if (!pgtable_l5_enabled())
952 * There is no need to do a workaround for the KNL stray
953 * A/D bit erratum here. PGDs only point to page tables
954 * except on 32-bit non-PAE which is not supported on
957 return !native_pgd_val(pgd);
959 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
961 #endif /* __ASSEMBLY__ */
963 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
964 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
968 extern int direct_gbpages;
969 void init_mem_mapping(void);
970 void early_alloc_pgt_buf(void);
971 extern void memblock_find_dma_reserve(void);
972 void __init poking_init(void);
973 unsigned long init_memory_mapping(unsigned long start,
974 unsigned long end, pgprot_t prot);
977 extern pgd_t trampoline_pgd_entry;
980 /* local pte updates need not use xchg for locking */
981 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
985 /* Pure native function needs no input for mm, addr */
986 native_pte_clear(NULL, 0, ptep);
990 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
994 native_pmd_clear(pmdp);
998 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1002 native_pud_clear(pudp);
1006 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1007 pte_t *ptep, pte_t pte)
1009 page_table_check_pte_set(mm, addr, ptep, pte);
1013 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1014 pmd_t *pmdp, pmd_t pmd)
1016 page_table_check_pmd_set(mm, addr, pmdp, pmd);
1020 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1021 pud_t *pudp, pud_t pud)
1023 page_table_check_pud_set(mm, addr, pudp, pud);
1024 native_set_pud(pudp, pud);
1028 * We only update the dirty/accessed state if we set
1029 * the dirty bit by hand in the kernel, since the hardware
1030 * will do the accessed bit for us, and we don't want to
1031 * race with other CPU's that might be updating the dirty
1032 * bit at the same time.
1034 struct vm_area_struct;
1036 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1037 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1038 unsigned long address, pte_t *ptep,
1039 pte_t entry, int dirty);
1041 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1042 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1043 unsigned long addr, pte_t *ptep);
1045 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1046 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1047 unsigned long address, pte_t *ptep);
1049 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1050 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1053 pte_t pte = native_ptep_get_and_clear(ptep);
1054 page_table_check_pte_clear(mm, addr, pte);
1058 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1059 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1060 unsigned long addr, pte_t *ptep,
1066 * Full address destruction in progress; paravirt does not
1067 * care about updates and native needs no locking
1069 pte = native_local_ptep_get_and_clear(ptep);
1070 page_table_check_pte_clear(mm, addr, pte);
1072 pte = ptep_get_and_clear(mm, addr, ptep);
1077 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1078 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1079 unsigned long addr, pte_t *ptep)
1081 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1084 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1086 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1088 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1089 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1090 unsigned long address, pmd_t *pmdp,
1091 pmd_t entry, int dirty);
1092 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1093 unsigned long address, pud_t *pudp,
1094 pud_t entry, int dirty);
1096 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1097 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1098 unsigned long addr, pmd_t *pmdp);
1099 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1100 unsigned long addr, pud_t *pudp);
1102 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1103 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1104 unsigned long address, pmd_t *pmdp);
1107 #define pmd_write pmd_write
1108 static inline int pmd_write(pmd_t pmd)
1110 return pmd_flags(pmd) & _PAGE_RW;
1113 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1114 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1117 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
1119 page_table_check_pmd_clear(mm, addr, pmd);
1124 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1125 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1126 unsigned long addr, pud_t *pudp)
1128 pud_t pud = native_pudp_get_and_clear(pudp);
1130 page_table_check_pud_clear(mm, addr, pud);
1135 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1136 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1137 unsigned long addr, pmd_t *pmdp)
1139 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1142 #define pud_write pud_write
1143 static inline int pud_write(pud_t pud)
1145 return pud_flags(pud) & _PAGE_RW;
1148 #ifndef pmdp_establish
1149 #define pmdp_establish pmdp_establish
1150 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1151 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1153 page_table_check_pmd_set(vma->vm_mm, address, pmdp, pmd);
1154 if (IS_ENABLED(CONFIG_SMP)) {
1155 return xchg(pmdp, pmd);
1158 WRITE_ONCE(*pmdp, pmd);
1164 #define __HAVE_ARCH_PMDP_INVALIDATE_AD
1165 extern pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma,
1166 unsigned long address, pmd_t *pmdp);
1169 * Page table pages are page-aligned. The lower half of the top
1170 * level is used for userspace and the top half for the kernel.
1172 * Returns true for parts of the PGD that map userspace and
1173 * false for the parts that map the kernel.
1175 static inline bool pgdp_maps_userspace(void *__ptr)
1177 unsigned long ptr = (unsigned long)__ptr;
1179 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1182 #define pgd_leaf pgd_large
1183 static inline int pgd_large(pgd_t pgd) { return 0; }
1185 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1187 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1188 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1189 * the user one is in the last 4k. To switch between them, you
1190 * just need to flip the 12th bit in their addresses.
1192 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1195 * This generates better code than the inline assembly in
1198 static inline void *ptr_set_bit(void *ptr, int bit)
1200 unsigned long __ptr = (unsigned long)ptr;
1203 return (void *)__ptr;
1205 static inline void *ptr_clear_bit(void *ptr, int bit)
1207 unsigned long __ptr = (unsigned long)ptr;
1210 return (void *)__ptr;
1213 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1215 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1218 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1220 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1223 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1225 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1228 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1230 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1232 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1235 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1237 * dst - pointer to pgd range anywhere on a pgd page
1239 * count - the number of pgds to copy.
1241 * dst and src can be on the same page, but the range must not overlap,
1242 * and must not cross a page boundary.
1244 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1246 memcpy(dst, src, count * sizeof(pgd_t));
1247 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1248 if (!static_cpu_has(X86_FEATURE_PTI))
1250 /* Clone the user space pgd as well */
1251 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1252 count * sizeof(pgd_t));
1256 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1257 static inline int page_level_shift(enum pg_level level)
1259 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1261 static inline unsigned long page_level_size(enum pg_level level)
1263 return 1UL << page_level_shift(level);
1265 static inline unsigned long page_level_mask(enum pg_level level)
1267 return ~(page_level_size(level) - 1);
1271 * The x86 doesn't have any external MMU info: the kernel page
1272 * tables contain all the necessary information.
1274 static inline void update_mmu_cache(struct vm_area_struct *vma,
1275 unsigned long addr, pte_t *ptep)
1278 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1279 unsigned long addr, pmd_t *pmd)
1282 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1283 unsigned long addr, pud_t *pud)
1286 #ifdef _PAGE_SWP_EXCLUSIVE
1287 #define __HAVE_ARCH_PTE_SWP_EXCLUSIVE
1288 static inline pte_t pte_swp_mkexclusive(pte_t pte)
1290 return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
1293 static inline int pte_swp_exclusive(pte_t pte)
1295 return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
1298 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
1300 return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
1302 #endif /* _PAGE_SWP_EXCLUSIVE */
1304 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1305 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1307 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1310 static inline int pte_swp_soft_dirty(pte_t pte)
1312 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1315 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1317 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1320 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1321 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1323 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1326 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1328 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1331 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1333 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1338 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1339 static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1341 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1344 static inline int pte_swp_uffd_wp(pte_t pte)
1346 return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1349 static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1351 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1354 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1356 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1359 static inline int pmd_swp_uffd_wp(pmd_t pmd)
1361 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1364 static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1366 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1368 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
1370 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1372 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1373 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1374 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1380 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1382 u32 pkru = read_pkru();
1384 if (!__pkru_allows_read(pkru, pkey))
1386 if (write && !__pkru_allows_write(pkru, pkey))
1393 * 'pteval' can come from a PTE, PMD or PUD. We only check
1394 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1395 * same value on all 3 types.
1397 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1399 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1402 need_pte_bits |= _PAGE_RW;
1404 if ((pteval & need_pte_bits) != need_pte_bits)
1407 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1410 #define pte_access_permitted pte_access_permitted
1411 static inline bool pte_access_permitted(pte_t pte, bool write)
1413 return __pte_access_permitted(pte_val(pte), write);
1416 #define pmd_access_permitted pmd_access_permitted
1417 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1419 return __pte_access_permitted(pmd_val(pmd), write);
1422 #define pud_access_permitted pud_access_permitted
1423 static inline bool pud_access_permitted(pud_t pud, bool write)
1425 return __pte_access_permitted(pud_val(pud), write);
1428 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1429 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1431 static inline bool arch_has_pfn_modify_check(void)
1433 return boot_cpu_has_bug(X86_BUG_L1TF);
1436 #define arch_has_hw_pte_young arch_has_hw_pte_young
1437 static inline bool arch_has_hw_pte_young(void)
1442 #ifdef CONFIG_XEN_PV
1443 #define arch_has_hw_nonleaf_pmd_young arch_has_hw_nonleaf_pmd_young
1444 static inline bool arch_has_hw_nonleaf_pmd_young(void)
1446 return !cpu_feature_enabled(X86_FEATURE_XENPV);
1450 #ifdef CONFIG_PAGE_TABLE_CHECK
1451 static inline bool pte_user_accessible_page(pte_t pte)
1453 return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
1456 static inline bool pmd_user_accessible_page(pmd_t pmd)
1458 return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) && (pmd_val(pmd) & _PAGE_USER);
1461 static inline bool pud_user_accessible_page(pud_t pud)
1463 return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) && (pud_val(pud) & _PAGE_USER);
1467 #endif /* __ASSEMBLY__ */
1469 #endif /* _ASM_X86_PGTABLE_H */