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We'we working on virtio-vsock in QEMU/KVM, which implements a host/guest communication device, allowing applications from both sides to communicate without the need of a network. It implements the POSIX Sockets API and supports both SOCK_STREAM and SOCK_DGRAM. For virtio-vsock support in QEMU/kernel, see bug 1291282 and bug 1291284. Once virtio-vsock is implemented, we want NFS (both server and client) to support it so that we can use it to share directories between the host and the guest, a feature we call "Virt-FS".
*** This bug has been marked as a duplicate of bug 1291286 ***