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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-Rspamd-Queue-Id: 04FC8A0006 X-Rspam-User: X-Stat-Signature: d61q5o8c9jpyb8idaqfshwtsrwqdgzqr X-Rspamd-Server: rspam03 X-HE-Tag: 1784368637-516643 X-HE-Meta: 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 D8pzw/DU 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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