KVM - Modify from IDE to VirtIO

I imported a CentOS 7 guest from XenServer to KVM.

After importing it into KVM the disk bus in use is the IDE.

I need to change the disk bus from IDE to VirtIO because VirtIO has better performance.

I have seen many forums... No solution so far... =[

How can I do this?

NOTE: When I change disk settings in Virtual Machine Manager (virt-manager) the grub menu is displayed, but the guest OS does not start.