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Tue, 01 Sep 2026 08:18:46 -0700 (PDT) From: Xueyuan Chen To: akpm@linux-foundation.org Cc: david@kernel.org, ljs@kernel.org, usama.arif@linux.dev, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, kas@kernel.org, rppt@kernel.org, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, 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, luto@kernel.org, peterz@infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v7 2/3] arm64/mm: add set_direct_map_ro() Date: Tue, 1 Sep 2026 23:18:17 +0800 Message-ID: <20260901151818.3191443-3-xueyuan.chen21@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901151818.3191443-1-xueyuan.chen21@gmail.com> References: <20260901151818.3191443-1-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() for arm64 and flush the TLB internally. 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 | 12 ++++++++++++ 2 files changed, 14 insertions(+) diff --git a/arch/arm64/include/asm/set_memory.h b/arch/arm64/include/asm/set_memory.h index 0091ba12200e..1be86dc11543 100644 --- a/arch/arm64/include/asm/set_memory.h +++ b/arch/arm64/include/asm/set_memory.h @@ -13,6 +13,8 @@ int set_memory_valid(unsigned long addr, int numpages, int enable); int set_direct_map_invalid_noflush(struct page *page, unsigned int numpages); int set_direct_map_default_noflush(struct page *page, unsigned int numpages); +int set_direct_map_ro(struct page *page, unsigned int nr); +#define set_direct_map_ro set_direct_map_ro 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 132938b32eb1..0e95cd904ccb 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -355,6 +355,18 @@ int realm_register_memory_enc_ops(void) return arm64_mem_crypt_ops_register(&realm_crypt_ops); } +int set_direct_map_ro(struct page *page, unsigned int nr) +{ + unsigned long addr = (unsigned long)page_address(page); + + if (!can_set_direct_map()) + return 0; + + return __change_memory_common(addr, PAGE_SIZE * nr, + __pgprot(PTE_RDONLY), + __pgprot(PTE_WRITE)); +} + #ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { -- 2.47.3