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mm: page_table_check: move pxx_user_accessible_page into x86

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The pxx_user_accessible_page() checks the PTE bit, it's
architecture-specific code, move them into x86's pgtable.h.

These helpers are being moved out to make the page table check framework
platform independent.

Link: https://lkml.kernel.org/r/20220507110114.4128854-3-tongtiangen@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Acked-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kefeng Wang 2022-05-12 20:23:06 -07:00 committed by Andrew Morton
parent 92fb05242a
commit e5a5540146
2 changed files with 17 additions and 17 deletions
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17
arch/x86/include/asm/pgtable.h
View File

@ -1447,6 +1447,23 @@ static inline bool arch_faults_on_old_pte(void)
return false;
}
#ifdef CONFIG_PAGE_TABLE_CHECK
static inline bool pte_user_accessible_page(pte_t pte)
{
return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
}
static inline bool pmd_user_accessible_page(pmd_t pmd)
{
return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) && (pmd_val(pmd) & _PAGE_USER);
}
static inline bool pud_user_accessible_page(pud_t pud)
{
return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) && (pud_val(pud) & _PAGE_USER);
}
#endif
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_PGTABLE_H */

17
mm/page_table_check.c
View File

@ -52,23 +52,6 @@ static struct page_table_check *get_page_table_check(struct page_ext *page_ext)
return (void *)(page_ext) + page_table_check_ops.offset;
}
static inline bool pte_user_accessible_page(pte_t pte)
{
return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
}
static inline bool pmd_user_accessible_page(pmd_t pmd)
{
return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) &&
(pmd_val(pmd) & _PAGE_USER);
}
static inline bool pud_user_accessible_page(pud_t pud)
{
return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) &&
(pud_val(pud) & _PAGE_USER);
}
/*
* An enty is removed from the page table, decrement the counters for that page
* verify that it is of correct type and counters do not become negative.