I can see that both servers (without patch) identify themselves the
same, although they are not. The only difference is in the instruction
set avx512vnni
Old host
virsh domcapabilities kvm
<cpu>
<mode name='host-passthrough' supported='yes'/>
<mode name='host-model' supported='yes'>
<model fallback='forbid'>Cascadelake-Server</model>
<vendor>Intel</vendor>
<feature policy='require' name='ss'/>
<feature policy='require' name='vmx'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='umip'/>
<feature policy='require' name='pku'/>
<feature policy='require' name='md-clear'/>
<feature policy='require' name='stibp'/>
<feature policy='require' name='arch-capabilities'/>
<feature policy='require' name='xsaves'/>
<feature policy='require' name='invtsc'/>
<feature policy='require' name='ibpb'/>
<feature policy='require' name='amd-stibp'/>
<feature policy='require' name='amd-ssbd'/>
<feature policy='require' name='skip-l1dfl-vmentry'/>
<feature policy='require' name='pschange-mc-no'/>
<feature policy='disable' name='avx512vnni'/>
</mode>
New host
virsh domcapabilities kvm
<cpu>
<mode name='host-passthrough' supported='yes'/>
<mode name='host-model' supported='yes'>
<model fallback='forbid'>Cascadelake-Server</model>
<vendor>Intel</vendor>
<feature policy='require' name='ss'/>
<feature policy='require' name='vmx'/>
<feature policy='require' name='hypervisor'/>
<feature policy='require' name='tsc_adjust'/>
<feature policy='require' name='umip'/>
<feature policy='require' name='pku'/>
<feature policy='require' name='md-clear'/>
<feature policy='require' name='stibp'/>
<feature policy='require' name='arch-capabilities'/>
<feature policy='require' name='xsaves'/>
<feature policy='require' name='invtsc'/>
<feature policy='require' name='ibpb'/>
<feature policy='require' name='amd-stibp'/>
<feature policy='require' name='amd-ssbd'/>
<feature policy='require' name='rdctl-no'/>
<feature policy='require' name='ibrs-all'/>
<feature policy='require' name='skip-l1dfl-vmentry'/>
<feature policy='require' name='pschange-mc-no'/>
</mode>
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https://bugs.launchpad.net/bugs/1922907
Title:
Unable to use Skylake capability on Cascadelake server
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