gentoo guest using virtio

kernel config

CONFIG_NET_9P_VIRTIO=m
CONFIG_VIRTIO_BLK=m
CONFIG_VIRTIO_NET=m
CONFIG_VIRTIO_CONSOLE=y
CONFIG_HW_RANDOM_VIRTIO=m
CONFIG_VIRTIO=y
CONFIG_VIRTIO_RING=y
CONFIG_VIRTIO_PCI=y
CONFIG_VIRTIO_BALLOON=m

Virtualization —> 
  Host kernel accelerator for virtio net (EXPERIMENTAL)
<*>   PCI driver for virtio devices (EXPERIMENTAL)
  Virtio balloon driver (EXPERIMENTAL)
Networking Support —>   Plan 9 Resource Sharing Support (9P2000)  —> 
  9P Virtio Transport
Device Drivers  —>  [*] Block devices  —> 
  Virtio block driver (EXPERIMENTAL)
Device Drivers  —>  [*] Network device support  —>
  Virtio network driver (EXPERIMENTAL)
Device Drivers  —>  Character devices  —>
<*> Virtio console
  VirtIO Random Number Generator support