SeaBIOS 1.17 seems to break virtio devices in Linux VMs:

https://bugzilla.redhat.com/show_bug.cgi?id=2372329

If your Linux VMs suddenly appear to have no disks, this may be why.
Downgrading to SeaBIOS 1.16 (or using UEFI for VMs) is the workaround.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

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