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[154.26.158.71]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47a9de1d8f1sm24515956f8f.3.2026.07.06.06.06.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 06 Jul 2026 06:06:52 -0700 (PDT) From: Xueyuan Chen To: Andrew Morton , David Hildenbrand , Catalin Marinas , Will Deacon , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Lance Yang , Jann Horn , Yang Shi , Mike Rapoport , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , "H . Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Xueyuan Chen Subject: [RFC PATCH v3 2/3] arm64/mm: add set_direct_map_ro_noflush() Date: Mon, 6 Jul 2026 21:04:39 +0800 Message-ID: <20260706130440.9295-3-xueyuan.chen21@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260706130440.9295-1-xueyuan.chen21@gmail.com> References: <20260706130440.9295-1-xueyuan.chen21@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260706_060655_041708_4D4C17E1 X-CRM114-Status: GOOD ( 13.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Xueyuan Chen 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 bbe98ac9ad8c..1a6769073558 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 -- 2.49.0