Here's how to install a DragonFly BSD Guest under KVM Host:

1. Install kvm-84 or later on Linux host
1. Download DragonFly BSD ISO, e.g. dfly-2.2.1_REL.iso
1. Create guest with cpu(2), memory(1024m+), disk(ide), cdrom(ide), nic(e1000)
1. Boot guest use DragonFly BSD ISO with '-no-kvm' option, otherwise your screen will be ***mess*** !
1. Install DragonFly BSD as normal
1. Setup networks and sshd, make sure you can login the guest
1. Shutdown down DragonFly BSD guest
1. Reboot DragonFly BSD guest as normal(without '-no-kvm' option)
1. Login DragonFly BSD guest via ssh