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 X-Spam-Level: X-Spam-Status: No, score=-8.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 18704C07E95 for ; Fri, 16 Jul 2021 06:55:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EDE62613E3 for ; Fri, 16 Jul 2021 06:55:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235448AbhGPG6D (ORCPT ); Fri, 16 Jul 2021 02:58:03 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:32126 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235110AbhGPG56 (ORCPT ); Fri, 16 Jul 2021 02:57:58 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1626418504; 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; bh=G2/ayKuiffiy3YICPBYIgq3NBBxBKlJROEzMpWCI+BM=; b=cjcKvHGi7j22dztaJKvHqcJTi2MhB86xlo9XGuMTzWfRSls+y7DhysnzdQyREB736TrKM0 02wp5qSWXyE2187x/4CxwtMlI/S+MRk/jjUTme55vp+maTa6oJQ8tk0fllCosFX71kCVlS KD9srsNpN/ueLdl6o/+yMTq4x7+FJGY= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-32-LOzGfV4KO5Cg5gKP_PixNw-1; Fri, 16 Jul 2021 02:55:02 -0400 X-MC-Unique: LOzGfV4KO5Cg5gKP_PixNw-1 Received: by mail-wm1-f71.google.com with SMTP id 1-20020a05600c0201b029022095f349f3so3214472wmi.0 for ; Thu, 15 Jul 2021 23:55:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=G2/ayKuiffiy3YICPBYIgq3NBBxBKlJROEzMpWCI+BM=; b=kBqWxZIJvQySYUeX9kGjJmOh1hMkCgwbAVIIIMpVRIgwJqgoMwmq88VRGIP7J1Zqpp M08Cm48cvW+gF8aQz1qQX4Ypd3xQxDaceo1fOjylvJRwLldCasteJhSnfo0NOPL7B+yv fxF/gaGPW1cICEmt0a5Cedrcnn7R85mk+Y2ddZYOyHu700Ov697E8r55a4bpNaCvYcqi Qfk1n1l3VHsYH0inYUxnkvimXnrHt/QAhLt3X64g/zobrKUCwc5PLx5bFBIdlUJBgRE4 bmu4mqw1Kz2c+iHZoDdJ/oS0F2VUshWrEMn1k6iq8rSx3R37jSMwnve1s8tEtosAxQF7 PxBg== X-Gm-Message-State: AOAM531ETOIExSvEJJdwLKbwLEEuvDaXs/JrCRhgpu61koXhFLkMEXlZ Xbxi6XY4w5AWlCPvDQ1Y8Wau2W3/GTlLecFcaFqqknoPuBpcp3vqAP3KF+ga1bO9VxnLOj/h12Z m2fpL4bc+QIa+BAviY4oLrWcI X-Received: by 2002:a5d:6ac8:: with SMTP id u8mr10554923wrw.30.1626418501631; Thu, 15 Jul 2021 23:55:01 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxvXEs+UHNoWseUEXPi1RKsAEA1evMlPvZvUGwjdHerZri+1ke5g8EGjE+oGXMq8Fl/ebvlvQ== X-Received: by 2002:a5d:6ac8:: with SMTP id u8mr10554906wrw.30.1626418501422; Thu, 15 Jul 2021 23:55:01 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e? ([2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e]) by smtp.gmail.com with ESMTPSA id z16sm8860702wrh.58.2021.07.15.23.54.59 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Jul 2021 23:55:00 -0700 (PDT) Subject: Re: 5.13-rt1 + KVM = WARNING: at fs/eventfd.c:74 eventfd_signal() To: Hillf Danton Cc: Jason Wang , Thomas Gleixner , Sebastian Andrzej Siewior , "Michael S. Tsirkin" , Juri Lelli , LKML , Al Viro , He Zhe References: <8dfc0ee9-b97a-8ca8-d057-31c8cad3f5b6@redhat.com> <475f84e2-78ee-1a24-ef57-b16c1f2651ed@redhat.com> <20210715102249.2205-1-hdanton@sina.com> <20210716020611.2288-1-hdanton@sina.com> From: Paolo Bonzini Message-ID: <85944a65-4ecb-94d8-f2c5-d4643411fbee@redhat.com> Date: Fri, 16 Jul 2021 08:54:58 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210716020611.2288-1-hdanton@sina.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 16/07/21 04:06, Hillf Danton wrote: >> With the patch: >> - no warn >> - continue using the VM normally... > Well with the patch applied, the VM works fine without the stuff protected > by the spin_lock_irqsave(), then without the patch why simply printing a > warning makes the VM dumb, given the warning is there actually also preventing > you from touching the lock. > If the warning is triggered, eventfd_signal will not do the wakeup. Paolo