How to troubleshoot Packet loss for Passthru interface in KVM VM

Hello Team,

I would like to know how we troubleshoot if VM using passthrough interface whether Packet loss is happening in VM or REDHAT OS or physical port . once we create passthru interface we dont see IP link for that interface. If anyone know please let me know the procedure to troubleshooting commands to check the Passthru ineterface in REDHAT OS.

Regards
Solomon