kvm error in syslog says cpu0 unhandled rdmsr

Question

I have a server that hosts about 20 KVM guest machines. It's syslog is, at times, flooded with messages like these:

00:17:36 vhost-server kernel: [ 157.835078] kvm: 3138: cpu0 unhandled rdmsr: 0xc0010112 Mar 28 00:17:36 vhost-server kernel: [ 157.835108] kvm: 3138: cpu0 unhandled rdmsr: 0xc0010048 Mar 28 00:17:36 vhost-server kernel: [ 157.999164] kvm: 3138: cpu0 unhandled rdmsr: 0xc0010001 Mar 28 00:17:37 vhost-server kernel: [ 158.378247] kvm: 3179: cpu0 unhandled rdmsr: 0xc0010112 Mar 28 00:17:37 vhost-server kernel: [ 158.378277] kvm: 3179: cpu0 unhandled rdmsr: 0xc0010048 Mar 28 00:17:37 vhost-server kernel: [ 158.551881] kvm: 3179: cpu0 unhandled rdmsr: 0xc0010001 Mar 28 00:17:39 vhost-server kernel: [ 160.474937] kvm: 3508: cpu0 unhandled rdmsr: 0xc0010112 Mar 28 00:17:43 vhost-server kernel: [ 164.335746] kvm: 3342: cpu0 unhandled rdmsr: 0xc0010112 Mar 28 00:17:43 vhost-server kernel: [ 164.335752] kvm: 3342: cpu0 unhandled rdmsr: 0xc0010048 Mar 28 00:17:43 vhost-server kernel: [ 164.502836] kvm: 3342: cpu0 unhandled rdmsr: 0xc0010001 Mar 28 00:17:44 vhost-server kernel: [ 165.198538] kvm: 3392: cpu0 unhandled rdmsr: 0xc0010112 Mar 28 00:17:44 vhost-server kernel: [ 165.198545] kvm: 3392: cpu0 unhandled rdmsr: 0xc0010048 Mar 28 00:17:44 vhost-server kernel: [ 165.364203] kvm: 3392: cpu0 unhandled rdmsr: 0xc0010001 Mar 28 00:17:53 vhost-server kernel: [ 174.093009] kvm: 3731: cpu0 unhandled rdmsr: 0xc0010112

Things seem to be running fine. Anyone have any idea what this is?

Solution

Not a bug: echo 1 > /sys/module/kvm/parameters/ignore_msrs

Comments

[Kevin Bowen]

It sounds like this may be an already reported bug: bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/957957 You may want to take a look at that and indicate that you are also affected.

[sjas]

You really should have linked an english-speaking site. Most people in the world have no clue what is written there, and google translate is just 'not there', too.

[HDave]

didn't stop them...

[dman]

Might be harmless askubuntu.com/questions/274326/…