From: Catalin Marinas <catalin.marinas@arm.com>
To: Tong Tiangen <tongtiangen@huawei.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Andrew Morton <akpm@linux-foundation.org>,
Will Deacon <will@kernel.org>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Palmer Dabbelt <palmerdabbelt@google.com>,
Albert Ou <aou@eecs.berkeley.edu>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org
Subject: Re: [PATCH -next 3/4] arm64: mm: add support for page table check
Date: Mon, 21 Mar 2022 16:40:59 +0000 [thread overview]
Message-ID: <Yjiqm6tQB5To5Jd9@arm.com> (raw)
In-Reply-To: <d3006048-f737-439e-b985-cfbab69c4167@huawei.com>
On Mon, Mar 21, 2022 at 02:15:36PM +0800, Tong Tiangen wrote:
> Considering all your suggestions, The final logic should be:
>
> +#define pte_user(pte) (!!(pte_val(pte) & PTE_USER))
>
> +#define pmd_user(pmd) pte_user(pmd_pte(pmd))
> +#define pmd_user_exec(pmd) pte_user_exec(pmd_pte(pmd))
>
> +#define pud_user(pud) pte_user(pud_pte(pud))
>
> +static inline bool pte_user_accessible_page(pte_t pte)
> +{
> + return pte_present(pte) && (pte_user(pte)|| pte_user_exec(pte));
> +}
This is fine.
> +static inline bool pmd_user_accessible_page(pmd_t pmd)
> +{
> + return pmd_present(pmd) && (pmd_user(pmd)|| pmd_user_exec(pmd));
> +}
That's fine as well assuming that the function is only called on the
set_pmd_at() path where we know that the pmd would be a block mapping
(huge page). I think that's the case from a quick look at the current
x86 implementation.
> +static inline bool pud_user_accessible_page(pud_t pud)
> +{
> + return pud_present(pud) && pud_user(pud);
> +}
Same here.
--
Catalin
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next prev parent reply other threads:[~2022-03-21 16:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-17 14:11 [PATCH -next 0/4]mm: page_table_check: add support on arm64 and riscv Tong Tiangen
2022-03-17 14:12 ` [PATCH -next 1/4] mm: page_table_check: move pxx_user_accessible_page into x86 Tong Tiangen
2022-03-17 14:12 ` [PATCH -next 2/4] mm: page_table_check: add hooks to public helpers Tong Tiangen
2022-03-17 14:12 ` [PATCH -next 3/4] arm64: mm: add support for page table check Tong Tiangen
2022-03-17 19:00 ` Catalin Marinas
2022-03-18 3:58 ` Tong Tiangen
2022-03-18 17:18 ` Catalin Marinas
2022-03-21 6:15 ` Tong Tiangen
2022-03-21 16:40 ` Catalin Marinas [this message]
2022-03-22 3:07 ` Tong Tiangen
2022-03-17 14:12 ` [PATCH -next 4/4] riscv: " Tong Tiangen
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