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Thu, 30 Jul 2026 02:07:12 -0700 (PDT) From: Xueyuan Chen To: akpm@linux-foundation.org Cc: david@kernel.org, ljs@kernel.org, usama.arif@linux.dev, catalin.marinas@arm.com, will@kernel.org, linux-arm-kernel@lists.infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, rppt@kernel.org, ryan.roberts@arm.com, ziy@nvidia.com, baohua@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Xueyuan Chen , Lance Yang Subject: [PATCH v6 2/3] arm64/mm: add set_direct_map_ro_noflush() Date: Thu, 30 Jul 2026 17:06:46 +0800 Message-ID: <20260730090647.2401252-3-xueyuan.chen21@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260730090647.2401252-1-xueyuan.chen21@gmail.com> References: <20260730090647.2401252-1-xueyuan.chen21@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement set_direct_map_ro_noflush() for arm64 with update_range_prot() on the linear map, setting PTE_RDONLY and clearing PTE_WRITE. Keep the existing can_set_direct_map() guard and leave TLB invalidation to the caller. Co-developed-by: Lance Yang Signed-off-by: Lance Yang Signed-off-by: Xueyuan Chen --- arch/arm64/include/asm/set_memory.h | 2 ++ arch/arm64/mm/pageattr.c | 10 ++++++++++ 2 files changed, 12 insertions(+) diff --git a/arch/arm64/include/asm/set_memory.h b/arch/arm64/include/asm/set_memory.h index 90f61b17275e..7083260303c3 100644 --- a/arch/arm64/include/asm/set_memory.h +++ b/arch/arm64/include/asm/set_memory.h @@ -14,6 +14,8 @@ int set_memory_valid(unsigned long addr, int numpages, int enable); int set_direct_map_invalid_noflush(struct page *page); int set_direct_map_default_noflush(struct page *page); int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid); +int set_direct_map_ro_noflush(const void *addr, unsigned long nr_pages); +#define set_direct_map_ro_noflush set_direct_map_ro_noflush bool kernel_page_present(struct page *page); int set_memory_encrypted(unsigned long addr, int numpages); diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index ce035e1b4eaf..c51236b61651 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -365,6 +365,16 @@ int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) return set_memory_valid(addr, nr, valid); } +int set_direct_map_ro_noflush(const void *addr, unsigned long nr_pages) +{ + if (!can_set_direct_map()) + return 0; + + return update_range_prot((unsigned long)addr, PAGE_SIZE * nr_pages, + __pgprot(PTE_RDONLY), + __pgprot(PTE_WRITE)); +} + #ifdef CONFIG_DEBUG_PAGEALLOC /* * This is - apart from the return value - doing the same -- 2.47.3