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 * Macros to add or remove encryption attribute
21 #define pgprot_encrypted(prot) __pgprot(__sme_set(pgprot_val(prot)))
22 #define pgprot_decrypted(prot) __pgprot(__sme_clr(pgprot_val(prot)))
25 #include <asm/x86_init.h>
27 #include <asm/fpu/api.h>
28 #include <asm-generic/pgtable_uffd.h>
30 extern pgd_t early_top_pgt[PTRS_PER_PGD];
31 bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
33 void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
34 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
36 void ptdump_walk_pgd_level_checkwx(void);
37 void ptdump_walk_user_pgd_level_checkwx(void);
39 #ifdef CONFIG_DEBUG_WX
40 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
41 #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
43 #define debug_checkwx() do { } while (0)
44 #define debug_checkwx_user() do { } while (0)
48 * ZERO_PAGE is a global shared page that is always zero: used
49 * for zero-mapped memory areas etc..
51 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
53 #define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page))
55 extern spinlock_t pgd_lock;
56 extern struct list_head pgd_list;
58 extern struct mm_struct *pgd_page_get_mm(struct page *page);
60 extern pmdval_t early_pmd_flags;
62 #ifdef CONFIG_PARAVIRT_XXL
63 #include <asm/paravirt.h>
64 #else /* !CONFIG_PARAVIRT_XXL */
65 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
67 #define set_pte_atomic(ptep, pte) \
68 native_set_pte_atomic(ptep, pte)
70 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
72 #ifndef __PAGETABLE_P4D_FOLDED
73 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
74 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
78 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
81 #ifndef __PAGETABLE_PUD_FOLDED
82 #define p4d_clear(p4d) native_p4d_clear(p4d)
86 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
89 #ifndef __PAGETABLE_PUD_FOLDED
90 #define pud_clear(pud) native_pud_clear(pud)
93 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
94 #define pmd_clear(pmd) native_pmd_clear(pmd)
96 #define pgd_val(x) native_pgd_val(x)
97 #define __pgd(x) native_make_pgd(x)
99 #ifndef __PAGETABLE_P4D_FOLDED
100 #define p4d_val(x) native_p4d_val(x)
101 #define __p4d(x) native_make_p4d(x)
104 #ifndef __PAGETABLE_PUD_FOLDED
105 #define pud_val(x) native_pud_val(x)
106 #define __pud(x) native_make_pud(x)
109 #ifndef __PAGETABLE_PMD_FOLDED
110 #define pmd_val(x) native_pmd_val(x)
111 #define __pmd(x) native_make_pmd(x)
114 #define pte_val(x) native_pte_val(x)
115 #define __pte(x) native_make_pte(x)
117 #define arch_end_context_switch(prev) do {} while(0)
118 #endif /* CONFIG_PARAVIRT_XXL */
121 * The following only work if pte_present() is true.
122 * Undefined behaviour if not..
124 static inline int pte_dirty(pte_t pte)
126 return pte_flags(pte) & _PAGE_DIRTY;
129 static inline int pte_young(pte_t pte)
131 return pte_flags(pte) & _PAGE_ACCESSED;
134 static inline int pmd_dirty(pmd_t pmd)
136 return pmd_flags(pmd) & _PAGE_DIRTY;
139 static inline int pmd_young(pmd_t pmd)
141 return pmd_flags(pmd) & _PAGE_ACCESSED;
144 static inline int pud_dirty(pud_t pud)
146 return pud_flags(pud) & _PAGE_DIRTY;
149 static inline int pud_young(pud_t pud)
151 return pud_flags(pud) & _PAGE_ACCESSED;
154 static inline int pte_write(pte_t pte)
156 return pte_flags(pte) & _PAGE_RW;
159 static inline int pte_huge(pte_t pte)
161 return pte_flags(pte) & _PAGE_PSE;
164 static inline int pte_global(pte_t pte)
166 return pte_flags(pte) & _PAGE_GLOBAL;
169 static inline int pte_exec(pte_t pte)
171 return !(pte_flags(pte) & _PAGE_NX);
174 static inline int pte_special(pte_t pte)
176 return pte_flags(pte) & _PAGE_SPECIAL;
179 /* Entries that were set to PROT_NONE are inverted */
181 static inline u64 protnone_mask(u64 val);
183 static inline unsigned long pte_pfn(pte_t pte)
185 phys_addr_t pfn = pte_val(pte);
186 pfn ^= protnone_mask(pfn);
187 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
190 static inline unsigned long pmd_pfn(pmd_t pmd)
192 phys_addr_t pfn = pmd_val(pmd);
193 pfn ^= protnone_mask(pfn);
194 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
197 static inline unsigned long pud_pfn(pud_t pud)
199 phys_addr_t pfn = pud_val(pud);
200 pfn ^= protnone_mask(pfn);
201 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
204 static inline unsigned long p4d_pfn(p4d_t p4d)
206 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
209 static inline unsigned long pgd_pfn(pgd_t pgd)
211 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
214 #define p4d_leaf p4d_large
215 static inline int p4d_large(p4d_t p4d)
217 /* No 512 GiB pages yet */
221 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
223 #define pmd_leaf pmd_large
224 static inline int pmd_large(pmd_t pte)
226 return pmd_flags(pte) & _PAGE_PSE;
229 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
230 /* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_large */
231 static inline int pmd_trans_huge(pmd_t pmd)
233 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
236 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
237 static inline int pud_trans_huge(pud_t pud)
239 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
243 #define has_transparent_hugepage has_transparent_hugepage
244 static inline int has_transparent_hugepage(void)
246 return boot_cpu_has(X86_FEATURE_PSE);
249 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
250 static inline int pmd_devmap(pmd_t pmd)
252 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
255 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
256 static inline int pud_devmap(pud_t pud)
258 return !!(pud_val(pud) & _PAGE_DEVMAP);
261 static inline int pud_devmap(pud_t pud)
267 static inline int pgd_devmap(pgd_t pgd)
272 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
274 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
276 pteval_t v = native_pte_val(pte);
278 return native_make_pte(v | set);
281 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
283 pteval_t v = native_pte_val(pte);
285 return native_make_pte(v & ~clear);
288 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
289 static inline int pte_uffd_wp(pte_t pte)
291 return pte_flags(pte) & _PAGE_UFFD_WP;
294 static inline pte_t pte_mkuffd_wp(pte_t pte)
296 return pte_set_flags(pte, _PAGE_UFFD_WP);
299 static inline pte_t pte_clear_uffd_wp(pte_t pte)
301 return pte_clear_flags(pte, _PAGE_UFFD_WP);
303 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
305 static inline pte_t pte_mkclean(pte_t pte)
307 return pte_clear_flags(pte, _PAGE_DIRTY);
310 static inline pte_t pte_mkold(pte_t pte)
312 return pte_clear_flags(pte, _PAGE_ACCESSED);
315 static inline pte_t pte_wrprotect(pte_t pte)
317 return pte_clear_flags(pte, _PAGE_RW);
320 static inline pte_t pte_mkexec(pte_t pte)
322 return pte_clear_flags(pte, _PAGE_NX);
325 static inline pte_t pte_mkdirty(pte_t pte)
327 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
330 static inline pte_t pte_mkyoung(pte_t pte)
332 return pte_set_flags(pte, _PAGE_ACCESSED);
335 static inline pte_t pte_mkwrite(pte_t pte)
337 return pte_set_flags(pte, _PAGE_RW);
340 static inline pte_t pte_mkhuge(pte_t pte)
342 return pte_set_flags(pte, _PAGE_PSE);
345 static inline pte_t pte_clrhuge(pte_t pte)
347 return pte_clear_flags(pte, _PAGE_PSE);
350 static inline pte_t pte_mkglobal(pte_t pte)
352 return pte_set_flags(pte, _PAGE_GLOBAL);
355 static inline pte_t pte_clrglobal(pte_t pte)
357 return pte_clear_flags(pte, _PAGE_GLOBAL);
360 static inline pte_t pte_mkspecial(pte_t pte)
362 return pte_set_flags(pte, _PAGE_SPECIAL);
365 static inline pte_t pte_mkdevmap(pte_t pte)
367 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
370 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
372 pmdval_t v = native_pmd_val(pmd);
374 return native_make_pmd(v | set);
377 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
379 pmdval_t v = native_pmd_val(pmd);
381 return native_make_pmd(v & ~clear);
384 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
385 static inline int pmd_uffd_wp(pmd_t pmd)
387 return pmd_flags(pmd) & _PAGE_UFFD_WP;
390 static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
392 return pmd_set_flags(pmd, _PAGE_UFFD_WP);
395 static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
397 return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
399 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
401 static inline pmd_t pmd_mkold(pmd_t pmd)
403 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
406 static inline pmd_t pmd_mkclean(pmd_t pmd)
408 return pmd_clear_flags(pmd, _PAGE_DIRTY);
411 static inline pmd_t pmd_wrprotect(pmd_t pmd)
413 return pmd_clear_flags(pmd, _PAGE_RW);
416 static inline pmd_t pmd_mkdirty(pmd_t pmd)
418 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
421 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
423 return pmd_set_flags(pmd, _PAGE_DEVMAP);
426 static inline pmd_t pmd_mkhuge(pmd_t pmd)
428 return pmd_set_flags(pmd, _PAGE_PSE);
431 static inline pmd_t pmd_mkyoung(pmd_t pmd)
433 return pmd_set_flags(pmd, _PAGE_ACCESSED);
436 static inline pmd_t pmd_mkwrite(pmd_t pmd)
438 return pmd_set_flags(pmd, _PAGE_RW);
441 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
443 pudval_t v = native_pud_val(pud);
445 return native_make_pud(v | set);
448 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
450 pudval_t v = native_pud_val(pud);
452 return native_make_pud(v & ~clear);
455 static inline pud_t pud_mkold(pud_t pud)
457 return pud_clear_flags(pud, _PAGE_ACCESSED);
460 static inline pud_t pud_mkclean(pud_t pud)
462 return pud_clear_flags(pud, _PAGE_DIRTY);
465 static inline pud_t pud_wrprotect(pud_t pud)
467 return pud_clear_flags(pud, _PAGE_RW);
470 static inline pud_t pud_mkdirty(pud_t pud)
472 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
475 static inline pud_t pud_mkdevmap(pud_t pud)
477 return pud_set_flags(pud, _PAGE_DEVMAP);
480 static inline pud_t pud_mkhuge(pud_t pud)
482 return pud_set_flags(pud, _PAGE_PSE);
485 static inline pud_t pud_mkyoung(pud_t pud)
487 return pud_set_flags(pud, _PAGE_ACCESSED);
490 static inline pud_t pud_mkwrite(pud_t pud)
492 return pud_set_flags(pud, _PAGE_RW);
495 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
496 static inline int pte_soft_dirty(pte_t pte)
498 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
501 static inline int pmd_soft_dirty(pmd_t pmd)
503 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
506 static inline int pud_soft_dirty(pud_t pud)
508 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
511 static inline pte_t pte_mksoft_dirty(pte_t pte)
513 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
516 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
518 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
521 static inline pud_t pud_mksoft_dirty(pud_t pud)
523 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
526 static inline pte_t pte_clear_soft_dirty(pte_t pte)
528 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
531 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
533 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
536 static inline pud_t pud_clear_soft_dirty(pud_t pud)
538 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
541 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
544 * Mask out unsupported bits in a present pgprot. Non-present pgprots
545 * can use those bits for other purposes, so leave them be.
547 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
549 pgprotval_t protval = pgprot_val(pgprot);
551 if (protval & _PAGE_PRESENT)
552 protval &= __supported_pte_mask;
557 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
559 pgprotval_t massaged_val = massage_pgprot(pgprot);
561 /* mmdebug.h can not be included here because of dependencies */
562 #ifdef CONFIG_DEBUG_VM
563 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
564 "attempted to set unsupported pgprot: %016llx "
565 "bits: %016llx supported: %016llx\n",
566 (u64)pgprot_val(pgprot),
567 (u64)pgprot_val(pgprot) ^ massaged_val,
568 (u64)__supported_pte_mask);
574 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
576 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
577 pfn ^= protnone_mask(pgprot_val(pgprot));
579 return __pte(pfn | check_pgprot(pgprot));
582 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
584 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
585 pfn ^= protnone_mask(pgprot_val(pgprot));
586 pfn &= PHYSICAL_PMD_PAGE_MASK;
587 return __pmd(pfn | check_pgprot(pgprot));
590 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
592 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
593 pfn ^= protnone_mask(pgprot_val(pgprot));
594 pfn &= PHYSICAL_PUD_PAGE_MASK;
595 return __pud(pfn | check_pgprot(pgprot));
598 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
600 return pfn_pmd(pmd_pfn(pmd),
601 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
604 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
606 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
608 pteval_t val = pte_val(pte), oldval = val;
611 * Chop off the NX bit (if present), and add the NX portion of
612 * the newprot (if present):
614 val &= _PAGE_CHG_MASK;
615 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
616 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
620 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
622 pmdval_t val = pmd_val(pmd), oldval = val;
624 val &= _HPAGE_CHG_MASK;
625 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
626 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
631 * mprotect needs to preserve PAT and encryption bits when updating
634 #define pgprot_modify pgprot_modify
635 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
637 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
638 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
639 return __pgprot(preservebits | addbits);
642 #define pte_pgprot(x) __pgprot(pte_flags(x))
643 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
644 #define pud_pgprot(x) __pgprot(pud_flags(x))
645 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
647 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
649 static inline pgprot_t arch_filter_pgprot(pgprot_t prot)
651 return canon_pgprot(prot);
654 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
655 enum page_cache_mode pcm,
656 enum page_cache_mode new_pcm)
659 * PAT type is always WB for untracked ranges, so no need to check.
661 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
665 * Certain new memtypes are not allowed with certain
667 * - request is uncached, return cannot be write-back
668 * - request is write-combine, return cannot be write-back
669 * - request is write-through, return cannot be write-back
670 * - request is write-through, return cannot be write-combine
672 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
673 new_pcm == _PAGE_CACHE_MODE_WB) ||
674 (pcm == _PAGE_CACHE_MODE_WC &&
675 new_pcm == _PAGE_CACHE_MODE_WB) ||
676 (pcm == _PAGE_CACHE_MODE_WT &&
677 new_pcm == _PAGE_CACHE_MODE_WB) ||
678 (pcm == _PAGE_CACHE_MODE_WT &&
679 new_pcm == _PAGE_CACHE_MODE_WC)) {
686 pmd_t *populate_extra_pmd(unsigned long vaddr);
687 pte_t *populate_extra_pte(unsigned long vaddr);
689 #ifdef CONFIG_PAGE_TABLE_ISOLATION
690 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
693 * Take a PGD location (pgdp) and a pgd value that needs to be set there.
694 * Populates the user and returns the resulting PGD that must be set in
695 * the kernel copy of the page tables.
697 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
699 if (!static_cpu_has(X86_FEATURE_PTI))
701 return __pti_set_user_pgtbl(pgdp, pgd);
703 #else /* CONFIG_PAGE_TABLE_ISOLATION */
704 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
708 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
710 #endif /* __ASSEMBLY__ */
714 # include <asm/pgtable_32.h>
716 # include <asm/pgtable_64.h>
720 #include <linux/mm_types.h>
721 #include <linux/mmdebug.h>
722 #include <linux/log2.h>
723 #include <asm/fixmap.h>
725 static inline int pte_none(pte_t pte)
727 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
730 #define __HAVE_ARCH_PTE_SAME
731 static inline int pte_same(pte_t a, pte_t b)
733 return a.pte == b.pte;
736 static inline int pte_present(pte_t a)
738 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
741 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
742 static inline int pte_devmap(pte_t a)
744 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
748 #define pte_accessible pte_accessible
749 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
751 if (pte_flags(a) & _PAGE_PRESENT)
754 if ((pte_flags(a) & _PAGE_PROTNONE) &&
755 mm_tlb_flush_pending(mm))
761 static inline int pmd_present(pmd_t pmd)
764 * Checking for _PAGE_PSE is needed too because
765 * split_huge_page will temporarily clear the present bit (but
766 * the _PAGE_PSE flag will remain set at all times while the
767 * _PAGE_PRESENT bit is clear).
769 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
772 #ifdef CONFIG_NUMA_BALANCING
774 * These work without NUMA balancing but the kernel does not care. See the
775 * comment in include/linux/pgtable.h
777 static inline int pte_protnone(pte_t pte)
779 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
783 static inline int pmd_protnone(pmd_t pmd)
785 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
788 #endif /* CONFIG_NUMA_BALANCING */
790 static inline int pmd_none(pmd_t pmd)
792 /* Only check low word on 32-bit platforms, since it might be
793 out of sync with upper half. */
794 unsigned long val = native_pmd_val(pmd);
795 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
798 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
800 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
804 * Currently stuck as a macro due to indirect forward reference to
805 * linux/mmzone.h's __section_mem_map_addr() definition:
807 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
810 * Conversion functions: convert a page and protection to a page entry,
811 * and a page entry and page directory to the page they refer to.
813 * (Currently stuck as a macro because of indirect forward reference
814 * to linux/mm.h:page_to_nid())
816 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
818 static inline int pmd_bad(pmd_t pmd)
820 return (pmd_flags(pmd) & ~_PAGE_USER) != _KERNPG_TABLE;
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)
1012 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1013 pmd_t *pmdp, pmd_t pmd)
1018 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1019 pud_t *pudp, pud_t pud)
1021 native_set_pud(pudp, pud);
1025 * We only update the dirty/accessed state if we set
1026 * the dirty bit by hand in the kernel, since the hardware
1027 * will do the accessed bit for us, and we don't want to
1028 * race with other CPU's that might be updating the dirty
1029 * bit at the same time.
1031 struct vm_area_struct;
1033 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1034 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1035 unsigned long address, pte_t *ptep,
1036 pte_t entry, int dirty);
1038 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1039 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1040 unsigned long addr, pte_t *ptep);
1042 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1043 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1044 unsigned long address, pte_t *ptep);
1046 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1047 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1050 pte_t pte = native_ptep_get_and_clear(ptep);
1054 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1055 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1056 unsigned long addr, pte_t *ptep,
1062 * Full address destruction in progress; paravirt does not
1063 * care about updates and native needs no locking
1065 pte = native_local_ptep_get_and_clear(ptep);
1067 pte = ptep_get_and_clear(mm, addr, ptep);
1072 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1073 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1074 unsigned long addr, pte_t *ptep)
1076 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1079 #define flush_tlb_fix_spurious_fault(vma, address) do { } while (0)
1081 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1083 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1084 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1085 unsigned long address, pmd_t *pmdp,
1086 pmd_t entry, int dirty);
1087 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1088 unsigned long address, pud_t *pudp,
1089 pud_t entry, int dirty);
1091 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1092 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1093 unsigned long addr, pmd_t *pmdp);
1094 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1095 unsigned long addr, pud_t *pudp);
1097 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1098 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1099 unsigned long address, pmd_t *pmdp);
1102 #define pmd_write pmd_write
1103 static inline int pmd_write(pmd_t pmd)
1105 return pmd_flags(pmd) & _PAGE_RW;
1108 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1109 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1112 return native_pmdp_get_and_clear(pmdp);
1115 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1116 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1117 unsigned long addr, pud_t *pudp)
1119 return native_pudp_get_and_clear(pudp);
1122 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1123 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1124 unsigned long addr, pmd_t *pmdp)
1126 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1129 #define pud_write pud_write
1130 static inline int pud_write(pud_t pud)
1132 return pud_flags(pud) & _PAGE_RW;
1135 #ifndef pmdp_establish
1136 #define pmdp_establish pmdp_establish
1137 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1138 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1140 if (IS_ENABLED(CONFIG_SMP)) {
1141 return xchg(pmdp, pmd);
1144 WRITE_ONCE(*pmdp, pmd);
1150 * Page table pages are page-aligned. The lower half of the top
1151 * level is used for userspace and the top half for the kernel.
1153 * Returns true for parts of the PGD that map userspace and
1154 * false for the parts that map the kernel.
1156 static inline bool pgdp_maps_userspace(void *__ptr)
1158 unsigned long ptr = (unsigned long)__ptr;
1160 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1163 #define pgd_leaf pgd_large
1164 static inline int pgd_large(pgd_t pgd) { return 0; }
1166 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1168 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1169 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1170 * the user one is in the last 4k. To switch between them, you
1171 * just need to flip the 12th bit in their addresses.
1173 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1176 * This generates better code than the inline assembly in
1179 static inline void *ptr_set_bit(void *ptr, int bit)
1181 unsigned long __ptr = (unsigned long)ptr;
1184 return (void *)__ptr;
1186 static inline void *ptr_clear_bit(void *ptr, int bit)
1188 unsigned long __ptr = (unsigned long)ptr;
1191 return (void *)__ptr;
1194 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1196 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1199 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1201 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1204 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1206 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1209 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1211 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1213 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1216 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1218 * dst - pointer to pgd range anywhere on a pgd page
1220 * count - the number of pgds to copy.
1222 * dst and src can be on the same page, but the range must not overlap,
1223 * and must not cross a page boundary.
1225 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1227 memcpy(dst, src, count * sizeof(pgd_t));
1228 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1229 if (!static_cpu_has(X86_FEATURE_PTI))
1231 /* Clone the user space pgd as well */
1232 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1233 count * sizeof(pgd_t));
1237 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1238 static inline int page_level_shift(enum pg_level level)
1240 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1242 static inline unsigned long page_level_size(enum pg_level level)
1244 return 1UL << page_level_shift(level);
1246 static inline unsigned long page_level_mask(enum pg_level level)
1248 return ~(page_level_size(level) - 1);
1252 * The x86 doesn't have any external MMU info: the kernel page
1253 * tables contain all the necessary information.
1255 static inline void update_mmu_cache(struct vm_area_struct *vma,
1256 unsigned long addr, pte_t *ptep)
1259 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1260 unsigned long addr, pmd_t *pmd)
1263 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1264 unsigned long addr, pud_t *pud)
1268 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1269 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1271 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1274 static inline int pte_swp_soft_dirty(pte_t pte)
1276 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1279 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1281 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1284 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1285 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1287 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1290 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1292 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1295 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1297 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1302 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1303 static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1305 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1308 static inline int pte_swp_uffd_wp(pte_t pte)
1310 return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1313 static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1315 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1318 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1320 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1323 static inline int pmd_swp_uffd_wp(pmd_t pmd)
1325 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1328 static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1330 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1332 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
1334 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1336 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1337 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1338 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1344 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1346 u32 pkru = read_pkru();
1348 if (!__pkru_allows_read(pkru, pkey))
1350 if (write && !__pkru_allows_write(pkru, pkey))
1357 * 'pteval' can come from a PTE, PMD or PUD. We only check
1358 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1359 * same value on all 3 types.
1361 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1363 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1366 need_pte_bits |= _PAGE_RW;
1368 if ((pteval & need_pte_bits) != need_pte_bits)
1371 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1374 #define pte_access_permitted pte_access_permitted
1375 static inline bool pte_access_permitted(pte_t pte, bool write)
1377 return __pte_access_permitted(pte_val(pte), write);
1380 #define pmd_access_permitted pmd_access_permitted
1381 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1383 return __pte_access_permitted(pmd_val(pmd), write);
1386 #define pud_access_permitted pud_access_permitted
1387 static inline bool pud_access_permitted(pud_t pud, bool write)
1389 return __pte_access_permitted(pud_val(pud), write);
1392 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1393 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1395 static inline bool arch_has_pfn_modify_check(void)
1397 return boot_cpu_has_bug(X86_BUG_L1TF);
1400 #define arch_faults_on_old_pte arch_faults_on_old_pte
1401 static inline bool arch_faults_on_old_pte(void)
1406 #endif /* __ASSEMBLY__ */
1408 #endif /* _ASM_X86_PGTABLE_H */