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riscv: Implement pte_accessible()

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Like other architectures, a pte is accessible if it is present or if
there is a pending tlb flush and the pte is protnone (which could be the
case when a pte is downgraded to protnone before a flush tlb is
executed).

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240128115953.25085-1-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2024-01-28 12:59:53 +01:00 committed by Palmer Dabbelt
parent 914e618b43
commit 50b5bae5be
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1 changed files with 13 additions and 0 deletions
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arch/riscv/include/asm/pgtable.h
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@ -350,6 +350,19 @@ static inline int pte_present(pte_t pte)
return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
}
#define pte_accessible pte_accessible
static inline unsigned long pte_accessible(struct mm_struct *mm, pte_t a)
{
if (pte_val(a) & _PAGE_PRESENT)
return true;
if ((pte_val(a) & _PAGE_PROT_NONE) &&
atomic_read(&mm->tlb_flush_pending))
return true;
return false;
}
static inline int pte_none(pte_t pte)
{
return (pte_val(pte) == 0);