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 C0107C43458 for ; Mon, 13 Jul 2026 14:41:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id: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=+QHjjdTbiGN1D049E8RGFMMSF0ldvg1FQ67dJ588BQ0=; b=1JH1hzEH3dF1ck 5HD9+rUbz2TJXwJF4G3+KlABJHJCrlMM2F8qZ2Ldkt5XRLVX2L5Pp2oA9mXbjhdL1AWbmdBJBbVNO XVKvmJO410RzioVHpWgRsxOLexEdomuZeEdndXnO5/0pRxG+Zj2pSK+nrWXsR+8FVXXF40UyIh4+G hau0JwAhYyyJkFRxYMbPcBlB5EJPDU6ixoU3lt4dHW7/wNmgFsilS9MRbZ8Z7G0A+Xyqs6ZIjSquS RhVPuI+X/qt9qnRPT9HiFu5QjQY4sVAO4Xdi71O7qiJ6tyKuSk1nNO0jmM8EvYXZoT3jFfgo99H2m 15yiUOKjjdDN1GwfVOkQ==; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On 7/13/26 16:19, Dave Hansen wrote: > On 7/13/26 06:55, Yeoreum Yun wrote: >> We want to change how pXdp_get() works with generic compile-time folded >> page tables. To prepare for that, rework effective_prot() to ignore any >> folded page tables entries, as it will unconditionally get called by >> ptdump core with pXd_val(pXdp_get()), and we really should be ignoring >> that value for folded entries. >> >> For this, identify the first real page-table level and >> update effective_prot only when the current entry is not folded. > I'll let Yeoreum comment on most of it, just one thought below. > Nit: could you please clean up the "we's" and move over to imperative > voice for the series? We're picky about it on the x86 side, but I do > think it's generally a good preferred practice across the kernel. > > Also I really do think this made the code worse. effective_prot() is a > pretty tidy function. This change more than doubles the size and is also > basically the same block copied and pasted twice. > > Further, this does seem like it will stop filling out some of the > st->prot_levels[] entries. That seems like it might break things. It > definitely needs to be covered in the changelog. > > So, in the end, I'm not 100% sure what this is doing. Is it "optimizing" > the ptdump code? Or is it preemptively fixing code that will soon be > throwing a compile error? It's a preparation for getting called with folded entries that no longer duplicate the information. Otherwise, with later changes in this series would break it. Essentially, we have to teach x86 code to ignore levels that are folded (e.g., pgd, p4d) and start collecting effective prots from the actual first non-folded level. I was thinking about handling the "don't call effective_prot() with folded entries" in ptdump code, which would likely be cleaner. We'd still have to teach x86's effective_prot() about "this is your actual first non-folded level, everything below is not initialized (or we decide to just initialize it)" -- Cheers, David _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3E6D3439344; Mon, 13 Jul 2026 14:41:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783953702; cv=none; b=nedMQ+wFdNiks+sij2IZo8hrE1GgmFCV56pCipBgh4cufO+m0dkURt+j409RViWW6LxG6g++sA3kLksYp/MCBFW0wCihFdfBXZ4PfqsaxFkYJqlli2MX/biqEDKv8fExEA755HFoy4fpgh52o3Go6ZTIYvWu0pRPSG0EYBWD3HQ= ARC-Message-Signature:i=1; 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b=d/plkVO6rd2qyJeLzEs11C0CVJuuf2HHzGqHFvzPWjZv1ksY/lH0oxGrPqOvw8FfX 18MMa+NOVo5QdmAqNVR0UtR/9ZeqLdnY3BpMxrRbtBVmHu43AOkVBQkU1uQQd1F33P CbE+s+9cAC8IO5LVmPWqzQPOxfFSfCZKnF6ebz2JG4NKXqNKv1QYgQX6muXKZu3ONG iL5KScKLuAU/LfLE4qujl94KWh8JFBZIQy0cQrSUDrA0H6dYtF6tqwyifNJkq2SjWT sQ/MytTWT9Pj9iOKN186Nu8gU71p+1cNNW5Xci65ELCHB1s3hC3yM/OBIlGlmAenDI ZLwyPHMxcbq6g== Message-ID: Date: Mon, 13 Jul 2026 16:41:24 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 10/34] x86: mm: carve out the generic compile-time folded pgtable case in effective_prot() To: Dave Hansen , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org Cc: linux@armlinux.org.uk, akpm@linux-foundation.org, ankur.a.arora@oracle.com, rppt@kernel.org, linmag7@gmail.com, chleroy@kernel.org, klarasmodin@gmail.com, chenhuacai@kernel.org, kernel@xen0n.name, kas@kernel.org, zhangtianyang@loongson.cn, wangyuli@aosc.io, tsbogend@alpha.franken.de, ljs@kernel.org, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, ryan.roberts@arm.com, pasha.tatashin@soleen.com, rmclure@linux.ibm.com, baolin.wang@linux.alibaba.com, tj@kernel.org, kevin.brodsky@arm.com, anup@brainfault.org, atish.patra@linux.dev, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, hannes@cmpxchg.org, mhocko@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, kasong@tencent.com, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, anshuman.khandual@arm.com, yang@os.amperecomputing.com, chaitanyas.prakash@arm.com, ardb@kernel.org, guoren@kernel.org, yang.li85200@gmail.com, viro@zeniv.linux.org.uk, dinguyen@kernel.org, schuster.simon@siemens-energy.com, wangruikang@iscas.ac.cn, junhui.liu@pigmoral.tech, muchun.song@linux.dev, vishal.moola@gmail.com, namcao@linutronix.de, pavel@kernel.org, djbw@kernel.org, yu-cheng.yu@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, coxu@redhat.com, andreas@gaisler.com, liam@infradead.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, geert@linux-m68k.org, shorne@gmail.com, jonas@southpole.se, stefan.kristiansson@saunalahti.fi References: <20260713135614.1618183-1-yeoreum.yun@arm.com> <20260713135614.1618183-11-yeoreum.yun@arm.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 On 7/13/26 16:19, Dave Hansen wrote: > On 7/13/26 06:55, Yeoreum Yun wrote: >> We want to change how pXdp_get() works with generic compile-time folded >> page tables. To prepare for that, rework effective_prot() to ignore any >> folded page tables entries, as it will unconditionally get called by >> ptdump core with pXd_val(pXdp_get()), and we really should be ignoring >> that value for folded entries. >> >> For this, identify the first real page-table level and >> update effective_prot only when the current entry is not folded. > I'll let Yeoreum comment on most of it, just one thought below. > Nit: could you please clean up the "we's" and move over to imperative > voice for the series? We're picky about it on the x86 side, but I do > think it's generally a good preferred practice across the kernel. > > Also I really do think this made the code worse. effective_prot() is a > pretty tidy function. This change more than doubles the size and is also > basically the same block copied and pasted twice. > > Further, this does seem like it will stop filling out some of the > st->prot_levels[] entries. That seems like it might break things. It > definitely needs to be covered in the changelog. > > So, in the end, I'm not 100% sure what this is doing. Is it "optimizing" > the ptdump code? Or is it preemptively fixing code that will soon be > throwing a compile error? It's a preparation for getting called with folded entries that no longer duplicate the information. Otherwise, with later changes in this series would break it. Essentially, we have to teach x86 code to ignore levels that are folded (e.g., pgd, p4d) and start collecting effective prots from the actual first non-folded level. I was thinking about handling the "don't call effective_prot() with folded entries" in ptdump code, which would likely be cleaner. We'd still have to teach x86's effective_prot() about "this is your actual first non-folded level, everything below is not initialized (or we decide to just initialize it)" -- Cheers, David 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 5C3B7C43458 for ; Mon, 13 Jul 2026 14:41:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id: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; 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Mon, 13 Jul 2026 14:41:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783953700; bh=TBY6/zZhRC68VTHJE9tvmewxH4e1dhtoSqkrqElBdFc=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=d/plkVO6rd2qyJeLzEs11C0CVJuuf2HHzGqHFvzPWjZv1ksY/lH0oxGrPqOvw8FfX 18MMa+NOVo5QdmAqNVR0UtR/9ZeqLdnY3BpMxrRbtBVmHu43AOkVBQkU1uQQd1F33P CbE+s+9cAC8IO5LVmPWqzQPOxfFSfCZKnF6ebz2JG4NKXqNKv1QYgQX6muXKZu3ONG iL5KScKLuAU/LfLE4qujl94KWh8JFBZIQy0cQrSUDrA0H6dYtF6tqwyifNJkq2SjWT sQ/MytTWT9Pj9iOKN186Nu8gU71p+1cNNW5Xci65ELCHB1s3hC3yM/OBIlGlmAenDI ZLwyPHMxcbq6g== Message-ID: Date: Mon, 13 Jul 2026 16:41:24 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 10/34] x86: mm: carve out the generic compile-time folded pgtable case in effective_prot() To: Dave Hansen , Yeoreum Yun , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-arch@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-openrisc@vger.kernel.org Cc: linux@armlinux.org.uk, akpm@linux-foundation.org, ankur.a.arora@oracle.com, rppt@kernel.org, linmag7@gmail.com, chleroy@kernel.org, klarasmodin@gmail.com, chenhuacai@kernel.org, kernel@xen0n.name, kas@kernel.org, zhangtianyang@loongson.cn, wangyuli@aosc.io, tsbogend@alpha.franken.de, ljs@kernel.org, jgg@ziepe.ca, catalin.marinas@arm.com, will@kernel.org, arnd@arndb.de, ryan.roberts@arm.com, pasha.tatashin@soleen.com, rmclure@linux.ibm.com, baolin.wang@linux.alibaba.com, tj@kernel.org, kevin.brodsky@arm.com, anup@brainfault.org, atish.patra@linux.dev, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@kernel.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, hannes@cmpxchg.org, mhocko@kernel.org, qi.zheng@linux.dev, shakeel.butt@linux.dev, kasong@tencent.com, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, anshuman.khandual@arm.com, yang@os.amperecomputing.com, chaitanyas.prakash@arm.com, ardb@kernel.org, guoren@kernel.org, yang.li85200@gmail.com, viro@zeniv.linux.org.uk, dinguyen@kernel.org, schuster.simon@siemens-energy.com, wangruikang@iscas.ac.cn, junhui.liu@pigmoral.tech, muchun.song@linux.dev, vishal.moola@gmail.com, namcao@linutronix.de, pavel@kernel.org, djbw@kernel.org, yu-cheng.yu@intel.com, baolu.lu@linux.intel.com, Jonathan.Cameron@huawei.com, coxu@redhat.com, andreas@gaisler.com, liam@infradead.org, vbabka@kernel.org, surenb@google.com, mhocko@suse.com, geert@linux-m68k.org, shorne@gmail.com, jonas@southpole.se, stefan.kristiansson@saunalahti.fi References: <20260713135614.1618183-1-yeoreum.yun@arm.com> <20260713135614.1618183-11-yeoreum.yun@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org On 7/13/26 16:19, Dave Hansen wrote: > On 7/13/26 06:55, Yeoreum Yun wrote: >> We want to change how pXdp_get() works with generic compile-time folded >> page tables. To prepare for that, rework effective_prot() to ignore any >> folded page tables entries, as it will unconditionally get called by >> ptdump core with pXd_val(pXdp_get()), and we really should be ignoring >> that value for folded entries. >> >> For this, identify the first real page-table level and >> update effective_prot only when the current entry is not folded. > I'll let Yeoreum comment on most of it, just one thought below. > Nit: could you please clean up the "we's" and move over to imperative > voice for the series? We're picky about it on the x86 side, but I do > think it's generally a good preferred practice across the kernel. > > Also I really do think this made the code worse. effective_prot() is a > pretty tidy function. This change more than doubles the size and is also > basically the same block copied and pasted twice. > > Further, this does seem like it will stop filling out some of the > st->prot_levels[] entries. That seems like it might break things. It > definitely needs to be covered in the changelog. > > So, in the end, I'm not 100% sure what this is doing. Is it "optimizing" > the ptdump code? Or is it preemptively fixing code that will soon be > throwing a compile error? It's a preparation for getting called with folded entries that no longer duplicate the information. Otherwise, with later changes in this series would break it. Essentially, we have to teach x86 code to ignore levels that are folded (e.g., pgd, p4d) and start collecting effective prots from the actual first non-folded level. I was thinking about handling the "don't call effective_prot() with folded entries" in ptdump code, which would likely be cleaner. We'd still have to teach x86's effective_prot() about "this is your actual first non-folded level, everything below is not initialized (or we decide to just initialize it)" -- Cheers, David -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv