These are the both CPUs:

$> Multiple-CPUs.xml 
  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>Haswell-noTSX-IBRS</model>
    <vendor>Intel</vendor>
    <feature policy='require' name='vmx'/>
    <feature policy='require' name='rdrand'/>
  </cpu>

  <cpu mode='custom' match='exact' check='full'>
    <model fallback='forbid'>Skylake-Client-IBRS</model>
    <vendor>Intel</vendor>
    <feature policy='disable' name='pcid'/>
    <feature policy='disable' name='pdpe1gb'/>
  </cpu>

Run the command:

    $> virsh hypervisor-cpu-baseline Multiple-CPUs.xml 
    <cpu mode='custom' match='exact'>
      <model fallback='forbid'>Haswell-noTSX-IBRS</model>
      <vendor>Intel</vendor>
      <feature policy='require' name='rdrand'/>
      <feature policy='disable' name='pcid'/>
    </cpu>