| /* SPDX-License-Identifier: GPL-2.0 */ | |
| #ifndef _ASM_X86_PGALLOC_H | |
| #define _ASM_X86_PGALLOC_H | |
| #include <linux/threads.h> | |
| #include <linux/mm.h> /* for struct page */ | |
| #include <linux/pagemap.h> | |
| #define __HAVE_ARCH_PTE_ALLOC_ONE | |
| #define __HAVE_ARCH_PGD_FREE | |
| #include <asm-generic/pgalloc.h> | |
| static inline int __paravirt_pgd_alloc(struct mm_struct *mm) { return 0; } | |
| #ifdef CONFIG_PARAVIRT_XXL | |
| #include <asm/paravirt.h> | |
| #else | |
| #define paravirt_pgd_alloc(mm) __paravirt_pgd_alloc(mm) | |
| static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd) {} | |
| static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn) {} | |
| static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn) {} | |
| static inline void paravirt_alloc_pmd_clone(unsigned long pfn, unsigned long clonepfn, | |
| unsigned long start, unsigned long count) {} | |
| static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn) {} | |
| static inline void paravirt_alloc_p4d(struct mm_struct *mm, unsigned long pfn) {} | |
| static inline void paravirt_release_pte(unsigned long pfn) {} | |
| static inline void paravirt_release_pmd(unsigned long pfn) {} | |
| static inline void paravirt_release_pud(unsigned long pfn) {} | |
| static inline void paravirt_release_p4d(unsigned long pfn) {} | |
| #endif | |
| /* | |
| * Flags to use when allocating a user page table page. | |
| */ | |
| extern gfp_t __userpte_alloc_gfp; | |
| #ifdef CONFIG_PAGE_TABLE_ISOLATION | |
| /* | |
| * Instead of one PGD, we acquire two PGDs. Being order-1, it is | |
| * both 8k in size and 8k-aligned. That lets us just flip bit 12 | |
| * in a pointer to swap between the two 4k halves. | |
| */ | |
| #define PGD_ALLOCATION_ORDER 1 | |
| #else | |
| #define PGD_ALLOCATION_ORDER 0 | |
| #endif | |
| /* | |
| * Allocate and free page tables. | |
| */ | |
| extern pgd_t *pgd_alloc(struct mm_struct *); | |
| extern void pgd_free(struct mm_struct *mm, pgd_t *pgd); | |
| extern pgtable_t pte_alloc_one(struct mm_struct *); | |
| extern void ___pte_free_tlb(struct mmu_gather *tlb, struct page *pte); | |
| static inline void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte, | |
| unsigned long address) | |
| { | |
| ___pte_free_tlb(tlb, pte); | |
| } | |
| static inline void pmd_populate_kernel(struct mm_struct *mm, | |
| pmd_t *pmd, pte_t *pte) | |
| { | |
| paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); | |
| set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); | |
| } | |
| static inline void pmd_populate_kernel_safe(struct mm_struct *mm, | |
| pmd_t *pmd, pte_t *pte) | |
| { | |
| paravirt_alloc_pte(mm, __pa(pte) >> PAGE_SHIFT); | |
| set_pmd_safe(pmd, __pmd(__pa(pte) | _PAGE_TABLE)); | |
| } | |
| static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, | |
| struct page *pte) | |
| { | |
| unsigned long pfn = page_to_pfn(pte); | |
| paravirt_alloc_pte(mm, pfn); | |
| set_pmd(pmd, __pmd(((pteval_t)pfn << PAGE_SHIFT) | _PAGE_TABLE)); | |
| } | |
| #define pmd_pgtable(pmd) pmd_page(pmd) | |
| #if CONFIG_PGTABLE_LEVELS > 2 | |
| extern void ___pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd); | |
| static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd, | |
| unsigned long address) | |
| { | |
| ___pmd_free_tlb(tlb, pmd); | |
| } | |
| #ifdef CONFIG_X86_PAE | |
| extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd); | |
| #else /* !CONFIG_X86_PAE */ | |
| static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
| { | |
| paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); | |
| set_pud(pud, __pud(_PAGE_TABLE | __pa(pmd))); | |
| } | |
| static inline void pud_populate_safe(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) | |
| { | |
| paravirt_alloc_pmd(mm, __pa(pmd) >> PAGE_SHIFT); | |
| set_pud_safe(pud, __pud(_PAGE_TABLE | __pa(pmd))); | |
| } | |
| #endif /* CONFIG_X86_PAE */ | |
| #if CONFIG_PGTABLE_LEVELS > 3 | |
| static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) | |
| { | |
| paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); | |
| set_p4d(p4d, __p4d(_PAGE_TABLE | __pa(pud))); | |
| } | |
| static inline void p4d_populate_safe(struct mm_struct *mm, p4d_t *p4d, pud_t *pud) | |
| { | |
| paravirt_alloc_pud(mm, __pa(pud) >> PAGE_SHIFT); | |
| set_p4d_safe(p4d, __p4d(_PAGE_TABLE | __pa(pud))); | |
| } | |
| extern void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud); | |
| static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud, | |
| unsigned long address) | |
| { | |
| ___pud_free_tlb(tlb, pud); | |
| } | |
| #if CONFIG_PGTABLE_LEVELS > 4 | |
| static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) | |
| { | |
| if (!pgtable_l5_enabled()) | |
| return; | |
| paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); | |
| set_pgd(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); | |
| } | |
| static inline void pgd_populate_safe(struct mm_struct *mm, pgd_t *pgd, p4d_t *p4d) | |
| { | |
| if (!pgtable_l5_enabled()) | |
| return; | |
| paravirt_alloc_p4d(mm, __pa(p4d) >> PAGE_SHIFT); | |
| set_pgd_safe(pgd, __pgd(_PAGE_TABLE | __pa(p4d))); | |
| } | |
| static inline p4d_t *p4d_alloc_one(struct mm_struct *mm, unsigned long addr) | |
| { | |
| gfp_t gfp = GFP_KERNEL_ACCOUNT; | |
| if (mm == &init_mm) | |
| gfp &= ~__GFP_ACCOUNT; | |
| return (p4d_t *)get_zeroed_page(gfp); | |
| } | |
| static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d) | |
| { | |
| if (!pgtable_l5_enabled()) | |
| return; | |
| BUG_ON((unsigned long)p4d & (PAGE_SIZE-1)); | |
| free_page((unsigned long)p4d); | |
| } | |
| extern void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d); | |
| static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d, | |
| unsigned long address) | |
| { | |
| if (pgtable_l5_enabled()) | |
| ___p4d_free_tlb(tlb, p4d); | |
| } | |
| #endif /* CONFIG_PGTABLE_LEVELS > 4 */ | |
| #endif /* CONFIG_PGTABLE_LEVELS > 3 */ | |
| #endif /* CONFIG_PGTABLE_LEVELS > 2 */ | |
| #endif /* _ASM_X86_PGALLOC_H */ |