Comment 5 for bug 1130769

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Tim Comer (comer) wrote : Re: VirtFS (virtio-9p-pci) error: Parameter 'driver' expects device type

There's a USE flag for Gentoo's package "app-emulation/qemu":
virtfs Enable VirtFS support. See http://wiki.qemu.org/Documentation/9psetup

I'll try enabling it explicitly and see if it helps.