From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 906DAC61DBE for ; Tue, 25 Aug 2026 15:52:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=ZXk+8AC9tMdedJd5dFONsAVyXoD+TKxKvDZGwEn5NWc=; b=J6Py8wdUh7ePSJ+iwsgrQci82r nIlluoLad1dcj5MzDpQqGB+2TQQb2uflmkyl8AOXloQwqRGidIOne6jwTG2WvkQXcNIfr7h9cufhh 0kmUxy/AmR7hYd5PymXBeEqb3Vl7CzbTWp86LqY3lv2FbuiHuyD0ujtOGeeqYTsDJlzbG5JlCrm+S OPoELvWi3xFqmNzVBzMIUynFf8RM5NlyxDSGsQOcD+nrD35/Q1MVT0qV1wvbbotsNmf3HtWPbVH/X 57H+G6xMW/4wGLYPblpGaHljBj5dgjrmaaI6E1ViAgP8F4Ba2LpofuF4MfFMBWXgUmQ+UeJilm2AV 3WJGgeXQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wytRv-000000013wl-1usq; Tue, 25 Aug 2026 15:52:31 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wytRu-000000013wX-0A8y for linux-arm-kernel@lists.infradead.org; Tue, 25 Aug 2026 15:52:30 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 40A5440266; Tue, 25 Aug 2026 15:52:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F23831F000E9; Tue, 25 Aug 2026 15:52:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787673149; bh=ZXk+8AC9tMdedJd5dFONsAVyXoD+TKxKvDZGwEn5NWc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; 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-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 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