Comment 7 for bug 1869185

Unknown CPU e.g. --model Icelake-Server on s390x:
uvt-kvm: error: libvirt: this function is not supported by the connection driver: cannot translate CPU model Icelake-Server to a supported model

Default on s390x (no arg but the same with --model host-model)
  <cpu mode='custom' match='exact' check='partial'>
    <model fallback='forbid'>z13-base</model>
    <feature policy='require' name='aen'/>
    <feature policy='require' name='aefsi'/>
    <feature policy='require' name='msa5'/>
    <feature policy='require' name='msa4'/>
...

--model host-passthrough @s390x
  <cpu mode='host-passthrough' check='none'/>

explcit model --model z196 @s390x
  <cpu mode='custom' match='exact' check='partial'>
    <model fallback='allow'>z196</model>
  </cpu>

Looks all good on non-x86 as well