My resource:
      kernel: 4.16.8
      host system: Ubuntu 16.04
      Llbvirt : 4.2
      Qemu : 2.12
      Cpu : intel@core i7 6700
      guest system: windows7 professional 

My problem:
      In my host, Cpu frequency is 3800~3900 MHz(4 socket and 2 thread) because 
i turn on “Intel Turbo Boost”. And silent frequency is 3.40 GHz.
Then i boot my guest, But in Guest my cpu frequency is 3408 MHz. why it's not 
3800 MHz?
And here is my guest xml:

  <cpu mode='host-passthrough' check='none'>
    <topology sockets='1' cores='8' threads='1'/>

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