Product : Red Hat, RHV/4.0, RHV
Feature : USB Support, VM Config , Hypervisor
Content Owner:  Roman Macek
Summary
Yes
Details
RHV has the ability to hot-add network interface cards, virtual disk storage, vCPUs and memory. Hot unplug is not support currently for vCPUs and memory, but it is planned for future versions. Support is dependent on guest OS support.