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b=oI2Zk6aPcKkinmBuXHsTZ0lPJ4zsulOOd+7Q8ro+fhQrEaP7SevErk++Sfea1CJHw RTBp0SQ0bSsWlDvvcmXRJ0fkpWy7wuwH18ye7GWtdS442r3bFLRANmLUtv0GBoMf4k loic+XmPvhLSIQlKZS3Otbd5tQDJe9tlzll4BHZzYLDH00tWHwOKOQdrmEdE8C2tHa E6Y2ySQ+ywO71VP3c7v9uDXbV9Fo+xdyoP2wyUOH9bSLvYStTgwwTNsEmeqk+ZddGd nKb4s3xFXsLeVwCfjLCXrP20slkDnhpBM2ZVH0Vs0QxetWz+wIrI6DkAcu9PjWZm86 UGrGKqcDgz/WA== Message-ID: Date: Tue, 25 Aug 2026 17:52:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 2/3] arm64/mm: add set_direct_map_ro_noflush() To: Xueyuan Chen , akpm@linux-foundation.org Cc: ljs@kernel.org, usama.arif@linux.dev, catalin.marinas@arm.com, will@kernel.org, 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, rppt@kernel.org, ryan.roberts@arm.com, ziy@nvidia.com, baohua@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Lance Yang References: <20260730090647.2401252-1-xueyuan.chen21@gmail.com> <20260730090647.2401252-3-xueyuan.chen21@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: E75C3140004 X-Stat-Signature: iqmkjyd4eusffhbfodho4nofs4ao5ztr X-Rspam-User: X-HE-Tag: 1787673149-11949 X-HE-Meta: U2FsdGVkX19i0y8Hp3XS91skOOTuQ4Ve1xxvHyOxw6vRs26T1UqOIWOIoUOTa3b2GIAUwgSUYfh87csBuM01xDTOB+IFJkRprtXB9lMiRc1PS2Bp9BZ76hHObGsTTiqzGTPSeqnpfLXRWKuSmTJpDjO8tk/ibkSnRpSAoXNlvftqzffD00F+M/I+A9jYlLEZgdc+xBbLVKs/xW9mXy66iNtdOv6K929UPwht5va+5dm4yyKAO18r5Ib7AUmAPtd/T5IswAiyJd5DOF8xruHw4y0wMl8JOPJLvHrDbJOKOhaY7hf4UST5NJahk7lBBNP7c96l5PCF0voiIATjYnhQO8xXEjr/kfUvwH/g6XAgq4NtcKGB2cN67Huo8xUDKLlPvmPNeaMsNPJ+F7O4K8HnFiBg/BcqeBb55Vcu8oaVkuDfTFUiKT4MjLPfjywKNoqHYkqcwhMWB9XEcxbyRy0VOs2zB+pLci503OPqh4mS1udpT2st9+2LdnOZkmvA8lrYYCjYcEEoW7kikMqJ175sXMs669La9SGiyDat0O9QL4i7gWDqmRnt1Vi1Lrl07YksPEHDcf2bYQ0bVB9Kn7FKRwQvJPKNov3f1Gxr+mwXpNA/HIo7wrtHqsofA2G3L3sTJWJU7VMhZBVvg/DCJpNQoYvO96d2zeJ7a22NSBzrhtFB/x3/EtamNOsAvOxocpfNVGeuI2iz+4ORsSLgmd2MrmOOZg06EgC2himjX7GJ233tY+urLCbzVyqTsCHnbdxtDuZqNBt7yIdWyFE7GhuxGbUkEh4IGY7di450A86bKvFxKjQf9l+iA79E97DtdBk4UByuQfLRo2U1udZOTCMMrh+BS1sIXQxoCZSTzKYjJ8rFPVimqIwNH/Xljj12gto2ts77kJLdvAJonDxKXMFj6Yw4iInBFQKvle7gNMuWzGg8yUZDLGsZdgmuzLA3onnqIfPMO6jdDa6En7JK1nI 3XKoYnK0 YFH72rjWqC3bqr6tzwPmK30DSR8L1ZmvFE23UhTDaAhCQ3lWboQjjH2xX9zls4eirKmn0LONF7BuvypE+OR7sjFEfEINQB+85EZgZ0xfIS64U8S6q1Bw1VFDGBB+bqZTpMO6Rj6xaTaj6dsF7S+ryLoYZ/IbbP8/F6HBgOmAhIrhw4Zi9ZP7q+Da432h2mEoMUw3ERCPJtclcUcDg5iHrJjddSf4e6hQL7jDONi9kGg+wD6xG+m73Gr7EAh8GdFDu8UwFmKUV7dSDc9lCxDAS4VN/z8J7mu8LvYhh1mkl1ly6Uhym73xGPReYES/9vzqmQo21hojfLEgK4VM3tWXZ2V07X6Tw5SQZhLHCMOO5pmOfXOmv2fwuMPrpzZEpnKsdFon2UzBFVKhC3VvRzQBHt7fiiQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/30/26 11:06, Xueyuan Chen wrote: > 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 ce035e1b4eaf..c51236b61651 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 We'll need an ACK from arm64 maintaines. To me this looks good. -- Cheers, David