I tried to follow this guide
https://www.berrange.com/posts/2010/02/15/guest-cpu-model-configuration-i...
I found that the host that has the proble has no pbe|tm|ht||acpi|ds flags in output of
" cat /proc/cpuinfo"
In the Ovirt-Engine server I run the below
#virsh -r cpu-compare ./cpu-server.xml
CPU described in ./cpu-server.xml is incompatible with host CPU
#virsh -r cpu-baseline ./cpu-server.xml
<cpu mode='custom' match='exact'>
<model fallback='allow'>cpu64-rhel6</model>
<vendor>Intel</vendor>
<feature policy='require' name='xtpr'/>
<feature policy='require' name='cid'/>
<feature policy='require' name='est'/>
<feature policy='require' name='vmx'/>
<feature policy='require'
name='ds_cpl'/>
<feature policy='require' name='monitor'/>
<feature policy='require' name='dtes64'/>
<feature policy='require' name='pbe'/>
<feature policy='require' name='tm'/>
<feature policy='require' name='ht'/>
<feature policy='require' name='ss'/>
<feature policy='require' name='acpi'/>
<feature policy='require' name='ds'/>
<feature policy='require' name='vme'/>
</cpu>