I have the same Issue. My Pfsense 2.5qee don't boot up. I got the same Message, which is shown in the screen shoot. My Hdd Bus ist a virtual-block.
boot: order=virtio0
cores: 4
cpu: host,flags=+md-clear;+aes
memory: 8196
name: r00
net0: virtio=76:FC:A3:12:D8:C1,bridge=vmbr5,queues=8
net1...