cpu0 unhandled wrmsr: 0x680 data 0 [What does it mean?]

Hello,

Can someone please give some light as to what those errors mean?
>>
Dec 11 09:08:38 server01 kernel: __ratelimit: 55 callbacks suppressed
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled rdmsr: 0x345
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x680 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x6c0 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x681 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x6c1 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x682 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x6c2 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x683 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x6c3 data 0
Dec 11 09:08:38 server01 kernel: kvm: 175991: cpu0 unhandled wrmsr: 0x684 data 0

Thank you