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Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Lance Yang , Usama Arif , Jann Horn , Yang Shi , Mike Rapoport , Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Xueyuan Chen Subject: [RFC PATCH v4 3/3] x86/mm: add set_direct_map_ro_noflush() Date: Sat, 18 Jul 2026 17:56:47 +0800 Message-ID: <20260718095647.182592-4-xueyuan.chen21@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260718095647.182592-1-xueyuan.chen21@gmail.com> References: <20260718095647.182592-1-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-20260718_025717_838065_038811DA X-CRM114-Status: GOOD ( 12.33 ) 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 Implement set_direct_map_ro_noflush() for x86 using CPA directly on the passed direct-map address. Clear _PAGE_RW and _PAGE_DIRTY, keep alias checks disabled like the existing direct-map _noflush helpers, and leave TLB invalidation to the caller. Co-developed-by: Lance Yang Signed-off-by: Lance Yang Signed-off-by: Xueyuan Chen --- arch/x86/include/asm/set_memory.h | 2 ++ arch/x86/mm/pat/set_memory.c | 15 +++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h index 4362c26aa992..bd3817e06052 100644 --- a/arch/x86/include/asm/set_memory.h +++ b/arch/x86/include/asm/set_memory.h @@ -89,6 +89,8 @@ int set_pages_rw(struct page *page, int numpages); 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); extern int kernel_set_to_readonly; diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index d023a40a1e03..5987f4c84f6f 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -2662,6 +2662,21 @@ int set_direct_map_valid_noflush(struct page *page, unsigned nr, bool valid) return __set_pages_np(page, nr); } +int set_direct_map_ro_noflush(const void *addr, unsigned long nr_pages) +{ + unsigned long tempaddr = (unsigned long)addr; + struct cpa_data cpa = { + .vaddr = &tempaddr, + .pgd = NULL, + .numpages = nr_pages, + .mask_set = __pgprot(0), + .mask_clr = __pgprot(_PAGE_RW | _PAGE_DIRTY), + .flags = CPA_NO_CHECK_ALIAS, + }; + + return __change_page_attr_set_clr(&cpa, 1); +} + #ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { -- 2.47.3