There's a lot of paravirtualized devices even within an HVM type of VM. This is necessary for performance. You don't want to have to emulate a lot of things if

There's a lot of paravirtualized devices even within an HVM type of VM. This is necessary for performance. You don't want to have to emulate a lot of things if you don't have to. https://wiki.libvirt.org/page/Virtio https://wiki.libvirt.org/page/Virtio