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 C6D9CC02198 for ; Fri, 14 Feb 2025 10:06:59 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1tisaV-0003QA-JD; Fri, 14 Feb 2025 05:06:24 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tisaM-0003Po-4A for qemu-devel@nongnu.org; Fri, 14 Feb 2025 05:06:14 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1tisaK-0005VT-5D for qemu-devel@nongnu.org; Fri, 14 Feb 2025 05:06:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1739527568; 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: in-reply-to:in-reply-to:references:references; bh=gsr2zRLLvV3682MBxfKov1AISQlIrHN2xvELlCGIsjQ=; b=dO3KvrgDhFxym2lQbrs9PTZu4FXm44XG5pvroLQaHwleQcr8dmIXdwl9dgLv8HmnPX8Mex +lPrXyGsHwkMNlOiSdUOH4wq3HxLVFbffqEQdCALWmX9X8fv5iQTQrW/8i3w2tqV45HgvN MiM0PUqxTiZ8gAsEO4VdqmcFEmuxw3s= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-586-_blCAcIdP-KfXp2V4erMSw-1; Fri, 14 Feb 2025 05:06:07 -0500 X-MC-Unique: _blCAcIdP-KfXp2V4erMSw-1 X-Mimecast-MFC-AGG-ID: _blCAcIdP-KfXp2V4erMSw_1739527566 Received: from mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.15]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 42EBA1979057 for ; Fri, 14 Feb 2025 10:06:05 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.45.242.22]) by mx-prod-int-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id EE2211955E93 for ; Fri, 14 Feb 2025 10:06:03 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 63F0D21E6A28; Fri, 14 Feb 2025 11:06:01 +0100 (CET) From: Markus Armbruster To: Laurent Vivier Cc: qemu-devel@nongnu.org, =?utf-8?Q?Marc-Andr=C3=A9?= Lureau , Eric Blake , Jason Wang , Paolo Bonzini , Laine Stump , Stefano Brivio , "Michael S. Tsirkin" Subject: Re: [PATCH] net: vhost-user: add QAPI events to report connection state In-Reply-To: <20250214072629.1033314-1-lvivier@redhat.com> (Laurent Vivier's message of "Fri, 14 Feb 2025 08:26:25 +0100") References: <20250214072629.1033314-1-lvivier@redhat.com> Date: Fri, 14 Feb 2025 11:06:01 +0100 Message-ID: <871pw07sdy.fsf@pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 3.0 on 10.30.177.15 Received-SPF: pass client-ip=170.10.133.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.495, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Laurent Vivier writes: > The netdev reports NETDEV_VHOST_USER_CONNECTED event when > the chardev is connected, and NETDEV_VHOST_USER_DISCONNECTED > when it is disconnected. > > The NETDEV_VHOST_USER_CONNECTED event includes the ChardevInfo > (label, filename and frontend_open). > > This allows a system manager like libvirt to detect when the server > fails. > > For instance with passt: > > { 'execute': 'qmp_capabilities' } > { "return": { } } > > [killing passt here] > > { "timestamp": { "seconds": 1739517243, "microseconds": 115081 }, > "event": "NETDEV_VHOST_USER_DISCONNECTED", > "data": { "netdev-id": "netdev0" } } > > [automatic reconnection with reconnect-ms] > > { "timestamp": { "seconds": 1739517290, "microseconds": 343777 }, > "event": "NETDEV_VHOST_USER_CONNECTED", > "data": { "netdev-id": "netdev0", > "info": { "frontend-open": true, > "filename": "unix:", > "label": "chr0" } } } > > Signed-off-by: Laurent Vivier Standard question for events: if a management application misses an event, say because it restarts and reconnects, is there a way to obtain the missed information with a query command?