Identify:

[root@d255 majkl]# dmesg | tail
device vnet0 entered promiscuous mode
br0: topology change detected, propagating
br0: port 2(vnet0) entering forwarding state
vnet0: no IPv6 routers present
kvm: 1803: cpu0 unimplemented perfctr wrmsr: 0x186 data 0x130079
kvm: 1803: cpu0 unimplemented perfctr wrmsr: 0xc1 data 0xffe17b0c
kvm: 1803: cpu0 unimplemented perfctr wrmsr: 0x186 data 0x530079
kvm: 1803: cpu1 unimplemented perfctr wrmsr: 0x186 data 0x130079
kvm: 1803: cpu1 unimplemented perfctr wrmsr: 0xc1 data 0xffe17b0c
kvm: 1803: cpu1 unimplemented perfctr wrmsr: 0x186 data 0x530079

After start virtual it looks ok, but after 1 minute is broke down. On virtual isnt any apparent cause.

It is caused by procesor calling non-implemented commands: https://bugzilla.redhat.com/show_bug.cgi?id=507085

Solve:

yum upgrade kernel kvm kvm-kmod kvm-tools and then restart host server.