From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 E3F7C27E05B for ; Mon, 18 Aug 2025 07:49:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755503380; cv=none; b=lw1vLNrS6c+A9wiQ6dH3qzjT2A49CIH6XW/ujtDZGQZjNF3Pi54NNQVM59mvZl47QFM4pVg3YHV6kKEHgIRJAzWQZ7RZO+f3r5+8OAkr9MEEElPmxLCByQb2A/61SfQcpedubx6437mFVk2/Q+Zd0E89s5BiByWrFC3njRppnVE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755503380; c=relaxed/simple; bh=6996Xkme/svbIVv2Pa0E5WniIv8pv/8ScsaAB7vtzsQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Du0fnKLTB8el3d8N0kbYapddKX6tnrDxuWht8lotRWIWOQ5EXxS5H8uaS/KBKB2cNMJiTvjlGcQ/3BtE34RjBGGvOy6DPxAQkuvTzIQa4l1hS6GprXBhMNeryxSaITY4EdMvuWuxbR4OtXExIUDaku0jN5+2YeMjoXWA4jF6jms= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=fFLqlTQy; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="fFLqlTQy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755503377; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=JvG7aFZ8aE0+JNevCZ82bDuwuz+Fa5f4Y7h7OdT1St0=; b=fFLqlTQybQsFra5TozBmFhDZgP/djKCB74WYS1ZGMgUQNdftMAg3lVZJvCHVmHDSks2ZTG Xx6O5JGb70GY367iCEP9UkVnQUV4j6CkrKKN0ETWAqUB0eiOEEvOPYnNidisefTHkk4AzY MW9GpqQ/LqqC1JMVbLjSIpY89tJxHtg= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-241-63vQBEZbNXW9jQVDrUUuhg-1; Mon, 18 Aug 2025 03:49:36 -0400 X-MC-Unique: 63vQBEZbNXW9jQVDrUUuhg-1 X-Mimecast-MFC-AGG-ID: 63vQBEZbNXW9jQVDrUUuhg_1755503374 Received: by mail-wm1-f72.google.com with SMTP id 5b1f17b1804b1-45a1b05d251so20683145e9.1 for ; Mon, 18 Aug 2025 00:49:35 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1755503374; x=1756108174; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=JvG7aFZ8aE0+JNevCZ82bDuwuz+Fa5f4Y7h7OdT1St0=; b=Ob3P8eZC5/p80WY0zUpqW7R71TPb9MRbuLVGb27nIYtiQHZbj/IBenq+u6GqI52oOL VyY2+mu1YLhOEGJiObb3cmau5JhiXw/h4ni1GjgZtN3hu6jQ5MRLFD1u0ggn6aPI6QLV P/LPK2JKlH1roLfmU+gpnin61aVsuOjMiStgxjoxp1ytZq5+3ITJtALNRm44Gw0bblWm jy9BUuP1uVP8Q/p9aIbu2KVvMQ9tgWbJnLeZJdYNlsZ0WSY7+MpGc4CwuiT20oxCMwFg AH/k3QxxJTJF4zFT++kFMtx8s5UkPaFRtOqm8wyPv/q34Y5lPpqv5Dd3EYYSmZvXMduu KM+w== X-Forwarded-Encrypted: i=1; AJvYcCWqGyvO859P+YwpjysPd8e29+kKsGlP6CkY6ZCm8LvwjcWov/ZxiHBf/g6LmXR2KOVL+HXeG+Y=@vger.kernel.org X-Gm-Message-State: AOJu0YzB8ELjZalcZRK7lvUZNNthAYjrMwzToxaL2hMAuVRvxjcoc/EA cIOF27I7R00Xe8wdboBomEv14OoGBcG4l0OHrybbtPncA6PfYEw7jcHI6dUjTdEUMnxLhdfFn0u t4Va8qA9hLQuKjxDs/C9RqrRD/i2oLfLhO64aDD8VqshzsAUVJRXylapcyQ== X-Gm-Gg: ASbGncuCLLBh/gjoJ09JPikKE8Kg9GRvzEIj2wreuaCK42hdGkchS3BSy/lndT8SQmY BGi0JQOE3FiAVNkw8SyQnndmXH4kCmqPk7RVpbwwQM1ttmOQc1IcA1N76Yycd3dKqMcHBsJqROH HKp/rAZDVRSJoAbHykMpFdWkTTJJL2b+f2+xqVRJzp6nL/u3A1pjiwnpH/2r1Jp4bOJR7Gzpu03 7DVzm7mPcawMM1yE3US6cBLWY6Md+lW8BoioFbFyFMBEEW7tD3ZrRGy3e9fkIAGBB/ZBTYQPAjW Ks/JK+3JUeFOOOySQo/tuR7SfRculiF5/NtmSAiwRWhybGmA+jmrmERMr+dUM58ZicLJVNfRK1H SpFZYTKIqWcmisP9Z/KBijBJeIShPGRdkpKLCc+mzQHgYXoHXzlY9Y3gyYDymCTSi X-Received: by 2002:a05:600c:1c11:b0:43d:42b:e186 with SMTP id 5b1f17b1804b1-45a217f38cbmr64475755e9.8.1755503373772; Mon, 18 Aug 2025 00:49:33 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE+R4BTN5wtqMrjV8DaHS5wNTE3hiVZhoPxXGSX+s7SlPH9szHPb2D+pX9sfU+sf8LvxTrSKg== X-Received: by 2002:a05:600c:1c11:b0:43d:42b:e186 with SMTP id 5b1f17b1804b1-45a217f38cbmr64475205e9.8.1755503373303; Mon, 18 Aug 2025 00:49:33 -0700 (PDT) Received: from ?IPV6:2003:d8:2f22:600:53c7:df43:7dc3:ae39? (p200300d82f22060053c7df437dc3ae39.dip0.t-ipconnect.de. [2003:d8:2f22:600:53c7:df43:7dc3:ae39]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3bb680798fasm11870486f8f.52.2025.08.18.00.49.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 18 Aug 2025 00:49:32 -0700 (PDT) Message-ID: <61cd1dfd-f51c-4f47-84d2-1f8b134105e4@redhat.com> Date: Mon, 18 Aug 2025 09:49:30 +0200 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V5 mm-hotfixes 3/3] x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() To: Harry Yoo , Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Andy Lutomirski , Peter Zijlstra , "H . Peter Anvin" Cc: Andrey Ryabinin , Arnd Bergmann , Dennis Zhou , Tejun Heo , Christoph Lameter , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , Juergen Gross , Kevin Brodsky , Oscar Salvador , Joao Martins , Lorenzo Sccakes , Jane Chu , Alistair Popple , Mike Rapoport , Gwan-gyeong Mun , "Aneesh Kumar K . V" , Uladzislau Rezki , "Liam R . Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Qi Zheng , Ard Biesheuvel , Thomas Huth , John Hubbard , Ryan Roberts , Peter Xu , Dev Jain , Bibo Mao , Anshuman Khandual , Joerg Roedel , x86@kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, stable@vger.kernel.org, Kiryl Shutsemau References: <20250818020206.4517-1-harry.yoo@oracle.com> <20250818020206.4517-4-harry.yoo@oracle.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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: <20250818020206.4517-4-harry.yoo@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 18.08.25 04:02, Harry Yoo wrote: > Define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to ensure > page tables are properly synchronized when calling > p*d_populate_kernel(). > > For 5-level paging, synchronization is performed via > pgd_populate_kernel(). In 4-level paging, pgd_populate() is a no-op, > so synchronization is instead performed at the P4D level via > p4d_populate_kernel(). > > This fixes intermittent boot failures on systems using 4-level paging > and a large amount of persistent memory: > > BUG: unable to handle page fault for address: ffffe70000000034 > #PF: supervisor write access in kernel mode > #PF: error_code(0x0002) - not-present page > PGD 0 P4D 0 > Oops: 0002 [#1] SMP NOPTI > RIP: 0010:__init_single_page+0x9/0x6d > Call Trace: > > __init_zone_device_page+0x17/0x5d > memmap_init_zone_device+0x154/0x1bb > pagemap_range+0x2e0/0x40f > memremap_pages+0x10b/0x2f0 > devm_memremap_pages+0x1e/0x60 > dev_dax_probe+0xce/0x2ec [device_dax] > dax_bus_probe+0x6d/0xc9 > [... snip ...] > > > It also fixes a crash in vmemmap_set_pmd() caused by accessing vmemmap > before sync_global_pgds() [1]: > > BUG: unable to handle page fault for address: ffffeb3ff1200000 > #PF: supervisor write access in kernel mode > #PF: error_code(0x0002) - not-present page > PGD 0 P4D 0 > Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI > Tainted: [W]=WARN > RIP: 0010:vmemmap_set_pmd+0xff/0x230 > > vmemmap_populate_hugepages+0x176/0x180 > vmemmap_populate+0x34/0x80 > __populate_section_memmap+0x41/0x90 > sparse_add_section+0x121/0x3e0 > __add_pages+0xba/0x150 > add_pages+0x1d/0x70 > memremap_pages+0x3dc/0x810 > devm_memremap_pages+0x1c/0x60 > xe_devm_add+0x8b/0x100 [xe] > xe_tile_init_noalloc+0x6a/0x70 [xe] > xe_device_probe+0x48c/0x740 [xe] > [... snip ...] > > Cc: > Fixes: 8d400913c231 ("x86/vmemmap: handle unpopulated sub-pmd ranges") > Closes: https://lore.kernel.org/linux-mm/20250311114420.240341-1-gwan-gyeong.mun@intel.com [1] > Suggested-by: Dave Hansen > Acked-by: Kiryl Shutsemau > Reviewed-by: Mike Rapoport (Microsoft) > Reviewed-by: Lorenzo Stoakes > Signed-off-by: Harry Yoo > --- Acked-by: David Hildenbrand -- Cheers David / dhildenb