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Message-ID: <ce64a10b-74ff-407f-a8a8-94c114f753bf@ghiti.fr>
Date: Thu, 14 Aug 2025 12:01:21 +0200
From: Alexandre Ghiti <alex@...ti.fr>
To: Andrew Donnellan <ajd@...ux.ibm.com>, linuxppc-dev@...ts.ozlabs.org,
linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, x86@...nel.org,
linux-riscv@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, pasha.tatashin@...een.com,
sweettea-kernel@...miny.me, nicholas@...ux.ibm.com,
christophe.leroy@...roup.eu, Rohan McLure <rmclure@...ux.ibm.com>,
Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v16 09/13] mm: Provide address parameter to
p{te,md,ud}_user_accessible_page()
On 8/13/25 08:26, Andrew Donnellan wrote:
> From: Rohan McLure <rmclure@...ux.ibm.com>
>
> On several powerpc platforms, a page table entry may not imply whether
> the relevant mapping is for userspace or kernelspace. Instead, such
> platforms infer this by the address which is being accessed.
>
> Add an additional address argument to each of these routines in order to
> provide support for page table check on powerpc.
>
> [ajd@...ux.ibm.com: rebase on arm64 changes]
> Signed-off-by: Rohan McLure <rmclure@...ux.ibm.com>
> Reviewed-by: Pasha Tatashin <pasha.tatashin@...een.com>
> Acked-by: Ingo Molnar <mingo@...nel.org> # x86
> Signed-off-by: Andrew Donnellan <ajd@...ux.ibm.com>
> ---
> v15: rebase
> ---
> arch/arm64/include/asm/pgtable.h | 6 +++---
> arch/riscv/include/asm/pgtable.h | 6 +++---
> arch/x86/include/asm/pgtable.h | 6 +++---
> mm/page_table_check.c | 12 ++++++------
> 4 files changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
> index 2203ebac81d9..254265e9a423 100644
> --- a/arch/arm64/include/asm/pgtable.h
> +++ b/arch/arm64/include/asm/pgtable.h
> @@ -1290,17 +1290,17 @@ static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
> #endif
>
> #ifdef CONFIG_PAGE_TABLE_CHECK
> -static inline bool pte_user_accessible_page(pte_t pte)
> +static inline bool pte_user_accessible_page(pte_t pte, unsigned long addr)
> {
> return pte_valid(pte) && (pte_user(pte) || pte_user_exec(pte));
> }
>
> -static inline bool pmd_user_accessible_page(pmd_t pmd)
> +static inline bool pmd_user_accessible_page(pmd_t pmd, unsigned long addr)
> {
> return pmd_valid(pmd) && !pmd_table(pmd) && (pmd_user(pmd) || pmd_user_exec(pmd));
> }
>
> -static inline bool pud_user_accessible_page(pud_t pud)
> +static inline bool pud_user_accessible_page(pud_t pud, unsigned long addr)
> {
> return pud_valid(pud) && !pud_table(pud) && (pud_user(pud) || pud_user_exec(pud));
> }
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index d60e1604852d..f3dd94929d58 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -817,17 +817,17 @@ static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
> }
>
> #ifdef CONFIG_PAGE_TABLE_CHECK
> -static inline bool pte_user_accessible_page(pte_t pte)
> +static inline bool pte_user_accessible_page(pte_t pte, unsigned long addr)
> {
> return pte_present(pte) && pte_user(pte);
> }
>
> -static inline bool pmd_user_accessible_page(pmd_t pmd)
> +static inline bool pmd_user_accessible_page(pmd_t pmd, unsigned long addr)
> {
> return pmd_leaf(pmd) && pmd_user(pmd);
> }
>
> -static inline bool pud_user_accessible_page(pud_t pud)
> +static inline bool pud_user_accessible_page(pud_t pud, unsigned long addr)
> {
> return pud_leaf(pud) && pud_user(pud);
> }
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index 63350b76c0c6..b977cebb5f44 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -1679,17 +1679,17 @@ static inline bool arch_has_hw_nonleaf_pmd_young(void)
> #endif
>
> #ifdef CONFIG_PAGE_TABLE_CHECK
> -static inline bool pte_user_accessible_page(pte_t pte)
> +static inline bool pte_user_accessible_page(pte_t pte, unsigned long addr)
> {
> return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
> }
>
> -static inline bool pmd_user_accessible_page(pmd_t pmd)
> +static inline bool pmd_user_accessible_page(pmd_t pmd, unsigned long addr)
> {
> return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) && (pmd_val(pmd) & _PAGE_USER);
> }
>
> -static inline bool pud_user_accessible_page(pud_t pud)
> +static inline bool pud_user_accessible_page(pud_t pud, unsigned long addr)
> {
> return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) && (pud_val(pud) & _PAGE_USER);
> }
> diff --git a/mm/page_table_check.c b/mm/page_table_check.c
> index 1c33439b9c0b..abc2232ceb39 100644
> --- a/mm/page_table_check.c
> +++ b/mm/page_table_check.c
> @@ -151,7 +151,7 @@ void __page_table_check_pte_clear(struct mm_struct *mm, unsigned long addr,
> if (&init_mm == mm)
> return;
>
> - if (pte_user_accessible_page(pte)) {
> + if (pte_user_accessible_page(pte, addr)) {
> page_table_check_clear(pte_pfn(pte), PAGE_SIZE >> PAGE_SHIFT);
> }
> }
> @@ -163,7 +163,7 @@ void __page_table_check_pmd_clear(struct mm_struct *mm, unsigned long addr,
> if (&init_mm == mm)
> return;
>
> - if (pmd_user_accessible_page(pmd)) {
> + if (pmd_user_accessible_page(pmd, addr)) {
> page_table_check_clear(pmd_pfn(pmd), PMD_SIZE >> PAGE_SHIFT);
> }
> }
> @@ -175,7 +175,7 @@ void __page_table_check_pud_clear(struct mm_struct *mm, unsigned long addr,
> if (&init_mm == mm)
> return;
>
> - if (pud_user_accessible_page(pud)) {
> + if (pud_user_accessible_page(pud, addr)) {
> page_table_check_clear(pud_pfn(pud), PUD_SIZE >> PAGE_SHIFT);
> }
> }
> @@ -208,7 +208,7 @@ void __page_table_check_ptes_set(struct mm_struct *mm, unsigned long addr,
>
> for (i = 0; i < nr; i++)
> __page_table_check_pte_clear(mm, addr + PAGE_SIZE * i, ptep_get(ptep + i));
> - if (pte_user_accessible_page(pte))
> + if (pte_user_accessible_page(pte, addr))
> page_table_check_set(pte_pfn(pte), nr, pte_write(pte));
> }
> EXPORT_SYMBOL(__page_table_check_ptes_set);
> @@ -234,7 +234,7 @@ void __page_table_check_pmds_set(struct mm_struct *mm, unsigned long addr,
>
> for (i = 0; i < nr; i++)
> __page_table_check_pmd_clear(mm, addr + PMD_SIZE * i, *(pmdp + i));
> - if (pmd_user_accessible_page(pmd))
> + if (pmd_user_accessible_page(pmd, addr))
> page_table_check_set(pmd_pfn(pmd), stride * nr, pmd_write(pmd));
> }
> EXPORT_SYMBOL(__page_table_check_pmds_set);
> @@ -250,7 +250,7 @@ void __page_table_check_puds_set(struct mm_struct *mm, unsigned long addr,
>
> for (i = 0; i < nr; i++)
> __page_table_check_pud_clear(mm, addr + PUD_SIZE * i, *(pudp + i));
> - if (pud_user_accessible_page(pud))
> + if (pud_user_accessible_page(pud, addr))
> page_table_check_set(pud_pfn(pud), stride * nr, pud_write(pud));
> }
> EXPORT_SYMBOL(__page_table_check_puds_set);
Acked-by: Alexandre Ghiti <alexghiti@...osinc.com> # riscv
Thanks,
Alex
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