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 4743F17BA9 for ; Tue, 5 Aug 2025 12:41:43 +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=1754397705; cv=none; b=WmhQfCxGkR9uTezEZAR3VaZQYime4F61PpWB5uZm+jnnpbH73JjAuc6F5zvstkpnEtRoy/+aKNHyCoKQdHd2cQfa7xd04lg5AUyXbiqbHyBA941lHagkCL5XYMl/rNa4Td6IFLTR9GGz1kaNsOaQFiJwt0oGkgXKKmQbF3BeW7M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754397705; c=relaxed/simple; bh=4edKX8MFzsIe2nUyt0nx9Wcw7CNGyzbjHNoleZLrPrI=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=doWeth4k0ZD1Q1MVYursEUyLoYqga1lZC4qnOjpo+miiZwWtfs8DLX+8mRGn50AXE+1cDdSt95ui0HpezFpxZfPXRToZ7ucFb6zoq8CeY4VmMxEhAFyVI37K7+dE5RkJQR4B61a8N8Dt/ZcqeqpEfYJElea6qdEO+/S78iqFKBs= 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=RhNusIZ2; 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="RhNusIZ2" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754397703; 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=7uQFaJ04uOldMqJWhw/ZrijNlur8OaDP5isRSjWvgMQ=; b=RhNusIZ2RhYrf5ePdpLvm1anB6mnUVP47tz2iT/rPhH3za4ldqm1IC0GxmHQ74//U+CVPB y0YeJHP2tLgFXxci4rJWC2DvpROlnB3pWj2SMyPiUBQPpq2gORqz71mB3OtZjpgzuGrAIo zJPTyo2E/j+qks1jUQuDpPH6pMqbsEo= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-681-Tq7bJys4NymQBM2f2BMIpQ-1; Tue, 05 Aug 2025 08:41:42 -0400 X-MC-Unique: Tq7bJys4NymQBM2f2BMIpQ-1 X-Mimecast-MFC-AGG-ID: Tq7bJys4NymQBM2f2BMIpQ_1754397701 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-3a54a8a0122so2261826f8f.2 for ; Tue, 05 Aug 2025 05:41:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754397701; x=1755002501; h=content-transfer-encoding:in-reply-to:organization: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=7uQFaJ04uOldMqJWhw/ZrijNlur8OaDP5isRSjWvgMQ=; b=RSf/OjoaYW75OmjCIdAO4ADs5V0qM+UMS+bMiUdT0vIQwTUbM6id3ti6w4aZqq7ANj AmeKDJtZtVBcnyXwnKdPHjYleh0VdWM15AKBIHPAx7Lt6xixg1ZCxI9ldDMWOgXsHEV8 ryXoz+Z9KLCOVk22ESK7CBYQ9V/oulUT9VSEFJRqWgJ7cET1D/twCMjTOK8NoY5C9C1a VcIGlRbfcTan9lEbKDDoU6w00t039ldhfgxJTeA+Ee9cE0tRppBQmUu6qTnsyUgrX+2P aVcBGsuH5AFEfFU1MO5ldPdQpjWiCFvCQyP3+y4JxaqcHDCq0y2fp369PTRe4hXWh3Yz r2+w== X-Forwarded-Encrypted: i=1; AJvYcCU/CKJ9eFCh8DRksxTmvX5KPI4DfscNGRuOUghKjwfvMNkREZOSvR3JzXqTKimxr3KGpa5KxfQUKu7Aioo=@vger.kernel.org X-Gm-Message-State: AOJu0Yz+HNq0eOIabeSFr9g+GkIUJibjjvMGkBF4ZzF7X/Vso+RvaVat qFZkJsj/K7m2hssgEYotNsEsxFZHS5MiWq8KSBB4+qm01MlBfT51YBg6armY4zC6I4V/QxRrwoR H7HxIuf9lT/vAR2wPS7ukMZVKowKmEdliuX91W6KCfbgtQVH+g8OjzxyOSmS+XlbrDA== X-Gm-Gg: ASbGncuqfXUpjh1Cp7udcokmS8UFYQYUWWrg1BI/5vor9y8Xtif9NlpSEunGojIz8Wt tB8Fk0UIirb5cwUGpRzBgVTnsv/q3ClmrrrfJYaRArZ9WrPUMnMPkoFq7tCF+RsOYRPNK8ZfZH4 lrtaSB4bJAVfNLZdTApqJ9xwxSRFRdw+IQ6ZBRaENHA5g32/zdU0SOTRs6Be/0ujjoE2dM21xr6 3Vhf3VNfZXly+gtw3ligjKY0YxB2MNedgrkafiGcboakfTl7uetOsnvgRkB4OXhblk2RL4AvbmE RbDx5aIJO3L03c8H14VR8d9Mga5Qk3z80gOgxegbnt2CFlQRrHHNWCfPmf/NkgG7XySSYew= X-Received: by 2002:a5d:5d10:0:b0:3b7:970d:a565 with SMTP id ffacd0b85a97d-3b8d94c1cbbmr11020610f8f.46.1754397700825; Tue, 05 Aug 2025 05:41:40 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHoBs3LRRrnqueBBh8exXTO/EKois18at+tf4gceWomdxr1F6hie41LrH1QETZPlxlL1PfTfA== X-Received: by 2002:a5d:5d10:0:b0:3b7:970d:a565 with SMTP id ffacd0b85a97d-3b8d94c1cbbmr11020590f8f.46.1754397700399; Tue, 05 Aug 2025 05:41:40 -0700 (PDT) Received: from [192.168.3.141] (p57a1a26f.dip0.t-ipconnect.de. [87.161.162.111]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b79c47c516sm19149849f8f.62.2025.08.05.05.41.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 Aug 2025 05:41:39 -0700 (PDT) Message-ID: Date: Tue, 5 Aug 2025 14:41:38 +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: [GIT PULL] VFIO updates for v6.17-rc1 To: Jason Gunthorpe Cc: Alex Williamson , Linus Torvalds , "kvm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "lizhe.67@bytedance.com" References: <20250804162201.66d196ad.alex.williamson@redhat.com> <20250804185306.6b048e7c.alex.williamson@redhat.com> <0a2e8593-47c6-4a17-b7b0-d4cb718b8f88@redhat.com> <20250805114908.GE184255@nvidia.com> <9b447a66-7dcb-442b-9d45-f0b14688aa8c@redhat.com> <20250805123858.GJ184255@nvidia.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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <20250805123858.GJ184255@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 05.08.25 14:38, Jason Gunthorpe wrote: > On Tue, Aug 05, 2025 at 02:07:49PM +0200, David Hildenbrand wrote: >> I don't see an easy way to guarantee that. E.g., populate_section_memmap >> really just does a kvmalloc_node() and >> __populate_section_memmap()->memmap_alloc() a memblock_alloc(). > > Well, it is really easy, if you do the kvmalloc_node and you get the > single unwanted struct page value, then call it again and free the > first one. The second call is guarenteed to not return the unwanted > value because the first call has it allocated. So you want to walk all existing sections to check that? :) That's the kind of approach I would describe with the words Linus used. -- Cheers, David / dhildenb