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/* 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 #include <asm-generic/pgalloc.h> / for pte_{alloc,free}_one / 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 static inline pmd_t pmd_alloc_one(struct mm_struct mm, unsigned long addr) { struct page page; gfp_t gfp = GFP_KERNEL_ACCOUNT \| __GFP_ZERO; if (mm == &init_mm) gfp &= ~__GFP_ACCOUNT; page = alloc_pages(gfp, 0); if (!page) return NULL; if (!pgtable_pmd_page_ctor(page)) { __free_pages(page, 0); return NULL; } return (pmd_t )page_address(page); } static inline void pmd_free(struct mm_struct mm, pmd_t pmd) { BUG_ON((unsigned long)pmd & (PAGE_SIZE-1)); pgtable_pmd_page_dtor(virt_to_page(pmd)); free_page((unsigned long)pmd); } 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))); } static inline pud_t pud_alloc_one(struct mm_struct mm, unsigned long addr) { gfp_t gfp = GFP_KERNEL_ACCOUNT; if (mm == &init_mm) gfp &= ~__GFP_ACCOUNT; return (pud_t )get_zeroed_page(gfp); } static inline void pud_free(struct mm_struct mm, pud_t pud) { BUG_ON((unsigned long)pud & (PAGE_SIZE-1)); free_page((unsigned long)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 */

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