From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Goerzen Subject: virtio_ioport_write unexpected address Date: Mon, 06 Feb 2012 09:53:43 -0600 Message-ID: <4F2FF787.9020408@complete.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: kvm@vger.kernel.org Return-path: Received: from glockenspiel.complete.org ([78.47.53.23]:56497 "EHLO glockenspiel.complete.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755353Ab2BFQKX (ORCPT ); Mon, 6 Feb 2012 11:10:23 -0500 Received: from 63-245-179-205.kitusa.com ([63.245.179.205] helo=erwin.lan.complete.org) by glockenspiel.complete.org with esmtps (with TLS1.0:RSA_AES_256_CBC_SHA1:32) (TLS peer CN erwin.complete.org, certificate verified) (Exim 4.72) id 1RuQt1-0000lV-BN for kvm@vger.kernel.org; Mon, 06 Feb 2012 09:53:47 -0600 Received: from hephaestus.lan.complete.org ([10.200.0.4]) by erwin.lan.complete.org with esmtps (with TLS1.0:RSA_AES_256_CBC_SHA1:32) (No TLS peer certificate) (Exim 4.72) id 1RuQsx-0002vz-6y for kvm@vger.kernel.org; Mon, 06 Feb 2012 09:53:43 -0600 Received: from [::1] by hephaestus.lan.complete.org with esmtp (Exim 4.77) (envelope-from ) id 1RuQsx-0002Ms-2c for kvm@vger.kernel.org; Mon, 06 Feb 2012 09:53:43 -0600 Sender: kvm-owner@vger.kernel.org List-ID: Hi, We're setting up some KVM systems with their disk image stored in a sparse raw file on an NFS4 server. The NFS4 filesystem is mounted with the hard option, which means that I/O to it is blocked indefinitely when the server goes down, and will be properly handled when the server returns. We observed a server failure over the weekend, and when the server returned -- not when it went down -- our Windows 2008 R2 VMs hard rebooted, with this in the libvirt log: virtio_ioport_write: unexpected address 0x13 value 0x1 virtio_ioport_write: unexpected address 0x13 value 0x1 The downtime had been about 30 minutes, and after the downtime, the NFS filesystem was responsive. We were presenting drive C to Windows as IDE, and a data drive with virtio. The host system is Debian squeeze x64, which is running the stock Debian 2.6.32 kernel and qemu-kvm 0.12.5. The Windows VMs have the latest virtio drivers from Fedora. Thanks, -- John