From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Lechner Subject: Re: kvm-88: KVM_APIC_READ: read reserved register b0 Date: Sun, 30 Aug 2009 11:59:27 +0200 Message-ID: <4A9A4D7F.3010904@l-mx.de> References: <4A97AB92.9090509@l-mx.de> <20090829212036.GA3014@defiant.freesoftware.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit To: dbareiro@gmx.net, kvm@vger.kernel.org Return-path: Received: from denver136.server4free.de ([217.172.178.136]:38244 "EHLO denver136.server4free.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752913AbZH3J71 (ORCPT ); Sun, 30 Aug 2009 05:59:27 -0400 In-Reply-To: <20090829212036.GA3014@defiant.freesoftware.org> Sender: kvm-owner@vger.kernel.org List-ID: Daniel Bareiro wrote: > On Friday, 28 August 2009 12:04:02 +0200, > Christoph Lechner wrote: > >> Hi all, > > Hi Christoph. Hi. > >> running kvm-88 on a 2.6.26-1-amd64 kernel (stock Debian 5.0 kernel), I >> get the syslog on the host system flooded with the message: >> >> Aug 28 11:49:40 reactor kernel: [124035.611782] KVM_APIC_READ: read >> reserved register b0 >> >> [...] > > Also I am observing this behavior in one of my hosts with KVM-88 and > Linux 2.6.30 compiled both by myself on Ubuntu GNU/Linux Hardy Heron > server amd64, as I've mentioned in a previous [1] mail. Guests has > Debian GNU/Linux Lenny with stock kernel 2.6.26. > > I was trying if with model=virtio the problem were solved, but was not > successful. It would seem that the cause is due to something related to > hardware of the host (is it possible?), since I have other hosts in > which I use both the same version of KVM and kernel, also both compiled > by myself, and I'm not having this problem. don't know if this is caused by the host hardware. But what I forgot to mention: I commented out the printk call in lapic.c. This stopped the flooding, but I know it's only a work around. - cl