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The QEMU vhost-user-fs-pci device provides virtio-fs host<->guest file system sharing (https://virtio-fs.gitlab.io/). The device is instantiated like this: $ qemu -chardev socket,path=/tmp/vhost-fs.sock,id=chr0 -device vhost-user-fs-pci,tag=myfs,chardev=chr0,cache-size=4G,versiontable=/dev/shm/fuse_shared_versions This patch adds the VhostUserFS DeviceDriver and command-line generation for this QEMU device. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>