Libvirt's validation process fails when mpx is not supported, even though it's not a requirement.

Software environment

• Operating system:
• Architecture:
• kernel version:
• libvirt version:
• Hypervisor and version:

Description of problem

Libvirt's validation process fails when mpx is not supported, even though it's not a requirement(mpx is disabled by default even if it is present on the node).

Steps to reproduce

1. Create a vm on a node without mpx with one of the following CPU Models: "Cascadelake-Server-noTSX","Cascadelake-Server","Icelake-Client-noTSX","Icelake-Client","Icelake-Server-noTSX","Icelake-Server","Skylake-Client-IBRS","Skylake-Client-noTSX-IBRS","Skylake-Client","Skylake-Server-IBRS":,"Skylake-Server-noTSX-IBRS" or "Skylake-Server".

The vm won't start unless i set check attribute to none to bypass validation, but this approach is not safe for Kubevirt.

getting the following error: "LibvirtError(Code=91, Domain=31, Message='the CPU is incompatible with host CPU: Host CPU does not provide required features: mpx')"

Additional information