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Tue, 01 Sep 2026 08:18:53 -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 3/3] x86/mm: add set_direct_map_ro() Date: Tue, 1 Sep 2026 23:18:18 +0800 Message-ID: <20260901151818.3191443-4-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 x86 with a page-based interface. Clear _PAGE_RW and _PAGE_DIRTY through the CPA path and let the common CPA wrapper invalidate stale writable translations before returning. 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 | 10 ++++++++++ 2 files changed, 12 insertions(+) diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h index 39271a5ea925..710164ea8258 100644 --- a/arch/x86/include/asm/set_memory.h +++ b/arch/x86/include/asm/set_memory.h @@ -88,6 +88,8 @@ int set_pages_rw(struct page *page, int numpages); int set_direct_map_invalid_noflush(struct page *page, unsigned int nr); int set_direct_map_default_noflush(struct page *page, unsigned int nr); +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); 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 a1a061d995b3..7c0cfa7acd17 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -2666,6 +2666,16 @@ int set_direct_map_default_noflush(struct page *page, unsigned int nr) return __set_pages_p(page, nr, 0); } +int set_direct_map_ro(struct page *page, unsigned int nr) +{ + unsigned long addr = (unsigned long)page_address(page); + + /* Direct-map callers are expected to pass pages without aliases. */ + return change_page_attr_set_clr(&addr, nr, __pgprot(0), + __pgprot(_PAGE_RW | _PAGE_DIRTY), 0, + CPA_NO_CHECK_ALIAS, NULL); +} + #ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { -- 2.47.3