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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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98a7e47faa
Four architectures currently implement 5-level pgtables: arm64, riscv, x86 and s390. The first three have essentially the same implementation for p4d_alloc_one() and p4d_free(), so we've got an opportunity to reduce duplication like at the lower levels. Provide a generic version of p4d_alloc_one() and p4d_free(), and make use of it on those architectures. Their implementation is the same as at PUD level, except that p4d_free() performs a runtime check by calling mm_p4d_folded(). 5-level pgtables depend on a runtime-detected hardware feature on all supported architectures, so we might as well include this check in the generic implementation. No runtime check is required in p4d_alloc_one() as the top-level p4d_alloc() already does the required check. Link: https://lkml.kernel.org/r/26d69c74a29183ecc335b9b407040d8e4cd70c6a.1736317725.git.zhengqi.arch@bytedance.com Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com> Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> [asm-generic] Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org> Cc: David Hildenbrand <david@redhat.com> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jann Horn <jannh@google.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Cc: Will Deacon <will@kernel.org> Cc: Yu Zhao <yuzhao@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
/* 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_MITIGATION_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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#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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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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