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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CDB8BC433EF for ; Tue, 28 Sep 2021 17:14:39 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 5557C611BD for ; Tue, 28 Sep 2021 17:14:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 5557C611BD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:47020 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mVGgg-0002k5-8C for qemu-devel@archiver.kernel.org; Tue, 28 Sep 2021 13:14:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:46482) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVGg1-000231-2j for qemu-devel@nongnu.org; Tue, 28 Sep 2021 13:13:57 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:31406) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mVGfy-0004An-Hk for qemu-devel@nongnu.org; Tue, 28 Sep 2021 13:13:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1632849233; 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=he93yaRqjLkNIulv+vJdxMw2h7JDQWkCu8uQeHxd8Dw=; b=W+jG9BK0ycxNJoyIXKNCFxW4ACu35KqagwPlVeFA8bjzKt9hG1dJLrJdqE3jdDkeexXCJr XXGCFCGfhTC1CzkEUrWKSSbYdjljrxmqNHpGLUXtWYzUyMicVa1RpSoqYyfapqmIcSFDNI VsOYIR45jpMFLmnLfjEsEk9PgX1Y8SE= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-310-xaDCqmwrP9KLGLDh-A9mdg-1; Tue, 28 Sep 2021 13:13:51 -0400 X-MC-Unique: xaDCqmwrP9KLGLDh-A9mdg-1 Received: by mail-wm1-f69.google.com with SMTP id p25-20020a1c5459000000b0030cac3d9db1so2350792wmi.6 for ; Tue, 28 Sep 2021 10:13:51 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:subject:to:cc:references:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=he93yaRqjLkNIulv+vJdxMw2h7JDQWkCu8uQeHxd8Dw=; b=2BAj3sOXa/lqYEWKad4y+6CHiJyiPD6K1hNKxDgI4PFtgvzVqGb8lKavndBeI60b+f /2/bKsXkwOVVKy2X6hrJUYUbIHj+cScCuQ7qrTLQAJJCKgz349MAI+FfHXqZchWk4iRX M0AFIlxZpKFP+pm7S4iQfhCWfUMBgppo/AzuajgGnxvR9b+a1wgpAZ2ddLKM03iaec1P dpN/J2Jy5OMHm/2T0Hxo9IFyYMw9JQu3r09tkSZotbwny2m+wkGGy7KWlN1r5N2BRGuu 10FkF0/B5DBI/lnZkdxsjAhfSrOex93B22BbaYAsYchQN1Cr9SZM5djA7TDsTWx18TC8 OAsA== X-Gm-Message-State: AOAM530mPYDyAq9ZmWS9ndzpMMZSJg41RseoiRWBHtxAU+lMVwQH/hKf pRGjj5K5lDrUa6BNslNZdigfuIdE/X/AFFe5Ozk63CL2lB+DnDyHfMbF6kd3Lz4viqiUJZG0lrr puxx6BMA14eFS13s= X-Received: by 2002:a5d:568c:: with SMTP id f12mr1426704wrv.79.1632849230320; Tue, 28 Sep 2021 10:13:50 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwn4F0j3bYq/VFTu0sRNswZ6M4T5Vc+N3LVmsASkgG8AMLrylwEaoyjYC0JhSb0Jl7HXdPf6g== X-Received: by 2002:a5d:568c:: with SMTP id f12mr1426677wrv.79.1632849230095; Tue, 28 Sep 2021 10:13:50 -0700 (PDT) Received: from [192.168.3.132] (p4ff23aaf.dip0.t-ipconnect.de. [79.242.58.175]) by smtp.gmail.com with ESMTPSA id j5sm7185960wrw.39.2021.09.28.10.13.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 28 Sep 2021 10:13:49 -0700 (PDT) Subject: Re: [PATCH v3 7/7] util/oslib-posix: Forward SIGBUS to MCE handler under Linux To: =?UTF-8?Q?Daniel_P=2e_Berrang=c3=a9?= References: <20210816094739.21970-1-david@redhat.com> <20210816094739.21970-8-david@redhat.com> From: David Hildenbrand Organization: Red Hat Message-ID: <000bfa33-40eb-efe8-6277-f8bc44d256d2@redhat.com> Date: Tue, 28 Sep 2021 19:13:48 +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: Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -53 X-Spam_score: -5.4 X-Spam_bar: ----- X-Spam_report: (-5.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.562, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , Eduardo Habkost , "Michael S. Tsirkin" , "Dr . David Alan Gilbert" , qemu-devel@nongnu.org, Igor Mammedov , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 28.09.21 18:59, Daniel P. Berrangé wrote: > On Mon, Aug 16, 2021 at 11:47:39AM +0200, David Hildenbrand wrote: >> Temporarily modifying the SIGBUS handler is really nasty, as we might be >> unlucky and receive an MCE SIGBUS while having our handler registered. >> Unfortunately, there is no way around messing with SIGBUS when >> MADV_POPULATE_WRITE is not applicable or not around. >> >> Let's forward SIGBUS that don't belong to us to the already registered >> handler and document the situation. >> >> Signed-off-by: David Hildenbrand >> --- >> softmmu/cpus.c | 4 ++++ >> util/oslib-posix.c | 36 +++++++++++++++++++++++++++++++++--- >> 2 files changed, 37 insertions(+), 3 deletions(-) > > Reviewed-by: Daniel P. Berrangé Thanks Daniel! -- Thanks, David / dhildenb