Description of problem:


Version-Release number of selected component (if applicable):
virt-manager.noarch                   1.1.0-12.el7                     @base

How reproducible:
always

Steps to Reproduce:
1. create a new VM
2. edit the Processor > check Copy host CPU configuration
3. start the VM

Actual results:
Error starting domain: unsupported configuration: host doesn't support invariant TSC

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 125, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1393, in startup
    self._backend.create()
  File "/usr/lib64/python2.7/site-packages/libvirt.py", line 966, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: unsupported configuration: host doesn't support invariant TSC


Expected results:
a started VM


Additional info:

qemu.x86_64                           2:2.0.0-1.el7.5                  @epel    
libvirt.x86_64                        1.2.8-16.el7_1.3                 @updates 
virt-manager.noarch                   1.1.0-12.el7                     @base