This patch implements a vhost-user-fs daemon based on Rust. It only
supports communicating through the virtqueues. The support for the
shared memory region associated with DAX will be added later.
It relies on all the code copied over from the crosvm repository, based
on the commit 961461350c0b6824e5f20655031bf6c6bf6b7c30.
It also relies on the vhost_user_backend crate, limiting the amount of
code needed to get this daemon up and running.
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
