Is there any documentation or somewhere I can look at features that could be selected?

I have started to create an extract from capabilities and domcapabilities to provide a list I can use for selection.

Example these are the following entries I have selected to allow running of Hyperv in Server 2019

  <features>
    <acpi/>
    <apic/>
    <hyperv mode='custom'>
      <relaxed state='on'/>
      <vapic state='on'/>
      <spinlocks state='on' retries='8191'/>
      <vendor_id state='on' value='none'/>
    </hyperv>
  </features>
  <cpu mode='custom' match='strict' check='none'>
    <model fallback='forbid'>Skylake-Client-IBRS</model>
    <topology sockets='1' dies='1' clusters='1' cores='4' threads='1'/>
  </cpu>
  <clock offset='localtime'>
    <timer name='hpet' present='no'/>
    <timer name='hypervclock' present='no'/>
  </clock>

But looking to find a list of options that would be valid to be specified.

Regards

Simon.