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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 A3A43C433EF for ; Tue, 23 Nov 2021 09:11:22 +0000 (UTC) Received: from localhost ([::1]:37186 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mpRph-0001HK-RE for qemu-devel@archiver.kernel.org; Tue, 23 Nov 2021 04:11:21 -0500 Received: from eggs.gnu.org ([209.51.188.92]:41034) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mpRoG-0008CI-6u for qemu-devel@nongnu.org; Tue, 23 Nov 2021 04:09:52 -0500 Received: from [2a00:1450:4864:20::430] (port=40950 helo=mail-wr1-x430.google.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mpRo8-0005mR-5g for qemu-devel@nongnu.org; Tue, 23 Nov 2021 04:09:48 -0500 Received: by mail-wr1-x430.google.com with SMTP id r8so37621778wra.7 for ; Tue, 23 Nov 2021 01:09:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=sender:message-id:date:mime-version:user-agent:content-language:to :cc:references:from:subject:in-reply-to:content-transfer-encoding; bh=EXjLq27uLPPwTfA6AVps4YfQwfYtoD5QB3WDXMP9avc=; b=VQpajBwcKuhcQjhlfCRYaCEPr3KvnCcA5Ih+sgVXncsJXlKSw74iRRii+5fS6bli2l KtFWmUca+J/l9XwEvj7CkfYgyJs/PbK/88dBzW5Sr4vYLhsZ/P6dRWsSV0dA4LjrNZNR AQIuw4Y3+tsAsszXSUvHAxpHcOYNKQ0kNly3sRhn9vI7re6S+hXr2Qf/O1X5o2b+lcT8 i7mNaroeCwT3gqv//CO6AYxwGlqY2w1f7EHxgi+skJRyuy22XRWLdvPuULUgRIxg1H4D V0Bw9p2jST4AMgrnxUOgMvXrRE5FcT7pUEuY9kQ1AfBLuz8mSasigRr6uPlCUcvE4jCk RVdg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:sender:message-id:date:mime-version:user-agent :content-language:to:cc:references:from:subject:in-reply-to :content-transfer-encoding; bh=EXjLq27uLPPwTfA6AVps4YfQwfYtoD5QB3WDXMP9avc=; b=gepr7IKB762uQHj2VvxXJPhZ+dUzlnrmKtlFn2Fzs6l05hRRvSYAriNh/zcetEUGJP xbod0LELKubbAGPJQ5YBYZ9nbCY0t4lK9HXymbLR+SRL666fKqUQCBrjOo8spZPoZxVS lz9EglREJZjxfZrE2LWOFm8L0Ilt5BqGb46KXP7I6H26tbEC2+Afypzl8DL17EAcqJan CX3Uns1nP7zL2tEhfUYuQ5GqisZG5REMQBPvccA8hyyHmA57QfYhjKdGmhss+RtrqiDN x3utU8nST94qNKVIaRUZkJUZ+qUP9UTB8noG/XEz+ewchN5UhkUbaBUn5SG085phgD05 FLpg== X-Gm-Message-State: AOAM5312m18wl10MuVlppxwhsh0a9haKZ715sXvgxzLcK9+EtWyUzE0x 83KbjPC7bqbjEtDWmwlPnIo= X-Google-Smtp-Source: ABdhPJwy1AzQRo/b3ioO4YgKfTSHULKRa4G3QiCYJTl72yZ7edFn0WP/0Q5lVgW3dJZi8IC+A1P4hA== X-Received: by 2002:a5d:6da2:: with SMTP id u2mr4870376wrs.273.1637658581691; Tue, 23 Nov 2021 01:09:41 -0800 (PST) Received: from ?IPV6:2001:b07:add:ec09:c399:bc87:7b6c:fb2a? ([2001:b07:add:ec09:c399:bc87:7b6c:fb2a]) by smtp.googlemail.com with ESMTPSA id m36sm522420wms.25.2021.11.23.01.09.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 23 Nov 2021 01:09:41 -0800 (PST) Message-ID: <2f3e9d7e-ce15-e47b-54c6-3ca3d7195d70@redhat.com> Date: Tue, 23 Nov 2021 10:09:28 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 Content-Language: en-US To: Chao Peng , "Kirill A. Shutemov" References: <20211119134739.20218-1-chao.p.peng@linux.intel.com> <20211119134739.20218-14-chao.p.peng@linux.intel.com> <20211122141647.3pcsywilrzcoqvbf@box.shutemov.name> <20211123010639.GA32088@chaop.bj.intel.com> From: Paolo Bonzini Subject: Re: [RFC v2 PATCH 13/13] KVM: Enable memfd based page invalidation/fallocate In-Reply-To: <20211123010639.GA32088@chaop.bj.intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::430 (failed) Received-SPF: pass client-ip=2a00:1450:4864:20::430; envelope-from=paolo.bonzini@gmail.com; helo=mail-wr1-x430.google.com X-Spam_score_int: -41 X-Spam_score: -4.2 X-Spam_bar: ---- X-Spam_report: (-4.2 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.249, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.248, NICE_REPLY_A=-3.515, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Wanpeng Li , jun.nakajima@intel.com, kvm@vger.kernel.org, david@redhat.com, qemu-devel@nongnu.org, "J . Bruce Fields" , dave.hansen@intel.com, "H . Peter Anvin" , ak@linux.intel.com, Jonathan Corbet , Joerg Roedel , x86@kernel.org, Hugh Dickins , Ingo Molnar , Borislav Petkov , luto@kernel.org, Thomas Gleixner , Vitaly Kuznetsov , Jim Mattson , linux-mm@kvack.org, Sean Christopherson , susie.li@intel.com, Jeff Layton , linux-kernel@vger.kernel.org, john.ji@intel.com, Yu Zhang , linux-fsdevel@vger.kernel.org, Andrew Morton , "Kirill A . Shutemov" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 11/23/21 02:06, Chao Peng wrote: >> Maybe the kvm has to be tagged with a sequential id that incremented every >> allocation. This id can be checked here. > Sounds like a sequential id will be needed, no existing fields in struct > kvm can work for this. There's no need to new concepts when there's a perfectly usable reference count. :) Paolo