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imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=R2mk+9E4; spf=pass (imf12.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1772827614; a=rsa-sha256; cv=none; b=vn9zA9kg5luRGh5j1DmgOTC1PKTStS8Yu1j1vYYFYeOUQOsUZzvl1PzwyjV03ro84PekEy vRTtm/lii//VijEfh2Jf+Z78cMuqqXQUiISovDJ1PVQ7gTD7Rg7lheDFhWtVwSGTFHMDty WYxGvKM6Vy3KyMWnjfEc9H9N7MYpw/k= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 967D74414F; Fri, 6 Mar 2026 20:06:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC53FC4CEF7; Fri, 6 Mar 2026 20:06:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772827612; bh=lcDXN6R21X2uCOK7uiaLL18UXsiIHBRj1spT/gMxVfk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=R2mk+9E44A2EFvK0xK2jJT1OvwtacnYo93YeFCRVWzRYkDIxnSpy7OOavzsLLEA6w Me1zMjmLO1OdfmZVcDCyAWo6f4IdCrOaG495OZ1gMNZBidhbVudI8sQS/6fxDcBV1X 1rdPbBicT3edr4r+AqB7wAFlka+l6GpipVY4vpZO2tZBVpmXlufaXt6DyLimsh7vxM LynZIGBSgJSqHS6/H1/kT3yqPiZomKF2oDGemN+plrNaz9+HWm0TsEfpDSzw4DOo8o QUNjs0SdR5wjM63xK41HWotBwOJ4UBuh5+4T6NTXr21s664CzFEO1RJRWOcZrbs7I5 BsQ0LBzjRGiYw== Message-ID: <659c7113-988b-4493-8866-82b55b49a626@kernel.org> Date: Fri, 6 Mar 2026 21:06:26 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 02/15] set_memory: add folio_{zap, restore}_direct_map helpers To: kalyazin@amazon.com, "Kalyazin, Nikita" , "kvm@vger.kernel.org" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "kvmarm@lists.linux.dev" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "bpf@vger.kernel.org" , "linux-kselftest@vger.kernel.org" , "kernel@xen0n.name" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "loongarch@lists.linux.dev" Cc: "pbonzini@redhat.com" , "corbet@lwn.net" , "maz@kernel.org" , "oupton@kernel.org" , "joey.gouly@arm.com" , "suzuki.poulose@arm.com" , "yuzenghui@huawei.com" , "catalin.marinas@arm.com" , "will@kernel.org" , "seanjc@google.com" , "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" , "willy@infradead.org" , "akpm@linux-foundation.org" , "lorenzo.stoakes@oracle.com" , "vbabka@suse.cz" , "rppt@kernel.org" , "surenb@google.com" , "mhocko@suse.com" , "ast@kernel.org" , "daniel@iogearbox.net" , "andrii@kernel.org" , "martin.lau@linux.dev" , "eddyz87@gmail.com" , "song@kernel.org" , "yonghong.song@linux.dev" , "john.fastabend@gmail.com" , "kpsingh@kernel.org" , "sdf@fomichev.me" , "haoluo@google.com" , "jolsa@kernel.org" , "jgg@ziepe.ca" , "jhubbard@nvidia.com" , "peterx@redhat.com" , "jannh@google.com" , "pfalcato@suse.de" , "shuah@kernel.org" , "riel@surriel.com" , "ryan.roberts@arm.com" , "jgross@suse.com" , "yu-cheng.yu@intel.com" , "kas@kernel.org" , "coxu@redhat.com" , "kevin.brodsky@arm.com" , "ackerleytng@google.com" , "maobibo@loongson.cn" , "prsampat@amd.com" , "mlevitsk@redhat.com" , "jmattson@google.com" , "jthoughton@google.com" , "agordeev@linux.ibm.com" , "alex@ghiti.fr" , "aou@eecs.berkeley.edu" , "borntraeger@linux.ibm.com" , "chenhuacai@kernel.org" , "dev.jain@arm.com" , "gor@linux.ibm.com" , "hca@linux.ibm.com" , "palmer@dabbelt.com" , "pjw@kernel.org" , "shijie@os.amperecomputing.com" , "svens@linux.ibm.com" , "thuth@redhat.com" , "wyihan@google.com" , "yang@os.amperecomputing.com" , "Jonathan.Cameron@huawei.com" , "Liam.Howlett@oracle.com" , "urezki@gmail.com" , "zhengqi.arch@bytedance.com" , "gerald.schaefer@linux.ibm.com" , "jiayuan.chen@shopee.com" , "lenb@kernel.org" , "osalvador@suse.de" , "pavel@kernel.org" , "rafael@kernel.org" , "vannapurve@google.com" , "jackmanb@google.com" , "aneesh.kumar@kernel.org" , "patrick.roy@linux.dev" , "Thomson, Jack" , "Itazuri, Takahiro" , "Manwaring, Derek" , "Cali, Marco" References: <20260126164445.11867-1-kalyazin@amazon.com> <20260126164445.11867-3-kalyazin@amazon.com> <40bd6f9b-d5c0-4844-81bc-d221cd9b058f@kernel.org> <38deb26a-918c-4743-b35f-92a1330dbf40@amazon.com> <5c322be7-ea81-4e6a-9689-978c35e93af6@amazon.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <5c322be7-ea81-4e6a-9689-978c35e93af6@amazon.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 325434000B X-Stat-Signature: k3tucrftx8g5ncaca6ykeat9dn4em3od X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1772827613-641029 X-HE-Meta: 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 n7nBMLYu MtB93RLu/4rtJGD00CGhSlToiSncN8wg+gFKRT76K8IJDVR6Kgh4U0N2pKe8axm2n1wWDd8p196jz9kV7LLvBQquyrx7sXFdsW39AOWm/rJubanhXoi7YWpb1NZV3CbE2OpnxN8xcbiiq0xbVyqrTUIYEktlJD/ED9jbWUVPWekZiRcaRdndRUx9iVu9gUsc7Zp2CQloHxBi/jjWAcP74+zcXOdh6/XcXZjvhv53IIqSQWPsduWP5bwfJvOFrC4AtgC4IsdQ9hmnfW7m98yC6LcVXD2HsitoakqdhV96zsiX+kjY0FRlo6l6HQfsyXXBAfOUFvSpM8oH7u9zibr5mwcQFDPH6rkMo0cXmD8rIjgyIdqI5O75FZNupvBC31UJmvhtJYU3Hea1y7jeGcPm0KTyd29X6OIvtBMSlvDGW9kPlfWVc1dbDuYecEqZzmyYhdMbnsAlQpZxSQ/iNdDSAuEF6k1wldgmTRwW+2PbCLZAJd8s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 3/6/26 16:41, Nikita Kalyazin wrote: > > > On 06/03/2026 15:17, David Hildenbrand (Arm) wrote: >> On 3/6/26 15:48, Nikita Kalyazin wrote: >>> >>> >>> >>> Yeah, that's unfortunately the status quo as pointed by Aneesh [1] >>> >>> [1] https://lore.kernel.org/kvm/yq5ajz07czvz.fsf@kernel.org/ >>> >>> >>> Yes, looks like that.  I'll remove the explicit flush and rely on >>> folio_zap_direct_map(). >>> >>> >>> I believe Dave meant to address that with folio_{zap,restore} >>> _direct_map() [2]. >>> >>> [2] https://lore.kernel.org/kvm/9409531b-589b-4a54- >>> b122-06a3cf0846f3@intel.com/ >>> >>> >>> I'd be inclined to know what arch maintainers think because I don't have >>> a strong opinion on that. >> >> You could also just perform a double flush, and let people that >> implemented a _noflush() to perform a flush optimize that later. > > Do you propose to just universalise the one from x86? > > int folio_zap_direct_map(struct folio *folio) > { >     const void *addr = folio_address(folio); >     int ret; > >     ret = set_direct_map_valid_noflush(addr, folio_nr_pages(folio), false); >     flush_tlb_kernel_range((unsigned long)addr, >                    (unsigned long)addr + folio_size(folio)); > >     return ret; > } Yes, exactly something along those lines! -- Cheers, David