From mboxrd@z Thu Jan 1 00:00:00 1970 From: "David S. Ahern" Subject: Re: [PATCH] Write to read-only msr MSR_IA32_PERF_STATUS is harmless, ignore it! Date: Tue, 31 Aug 2010 14:00:58 -0600 Message-ID: <4C7D5F7A.8030803@cisco.com> References: <1283257029-24102-1-git-send-email-Jes.Sorensen@redhat.com> <4C7D2DA6.40105@redhat.com> <4C7D2EDE.7020708@redhat.com> <4C7D3166.30702@redhat.com> <4C7D3617.5060804@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Avi Kivity , kvm@vger.kernel.org To: Jes Sorensen Return-path: Received: from rtp-iport-1.cisco.com ([64.102.122.148]:16827 "EHLO rtp-iport-1.cisco.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755382Ab0HaUBC (ORCPT ); Tue, 31 Aug 2010 16:01:02 -0400 In-Reply-To: <4C7D3617.5060804@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 08/31/10 11:04, Jes Sorensen wrote: >> Just grep for the msr name in a guest kernel source that's known to >> trigger the message. > > Been there, done that! This happens with an F13 kernel during reboot. > Ran the search on the expanded 2.6.32.8-149 tree and found no reference > to anything trying to write it, except for KVM backing up the flag, but > that shouldn't happen in the guest. I've been seeing the messages with a 32-bit Fedora 10 guest running a 2.6.27 variant. The wrmsr messages are generated by the time the grub menu appears. ie., pre-OS. David