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