crosvm is open to using rust-vmm modules. However, as of Fall 2020 there has been no progress toward that goal. Among other areas, differences in host operating system support methods in sys-util make integration challenging . It is possible to overcome this and enable crosvm to use common modules, but that work is not yet started.
Soon after crosvm's code was public, Amazon used it as the basis for their own VMM named Firecracker. After Firecracker came other rust-based VMM implementations, all using parts of crosvm. In order to drive collaboration and code sharing, an independent organization was created, named rust-vmm.
Rust-vmm aims to provide common components consumed by various implementations of VMMs using rust. This allows for sharing components such as virtio queue parsing while allowing full customization by individual VMM implementation. The goal is for several VMM projects, Firecracker, Cloud Hypervisor, and crosvm to use the shared components.
crosvm and rust-vmm are most alike in the kvm-bindings(limited by crosvm's use of aarch64 bindings on arm32 hosts), and vmm-sys-util(currently limited by differences in non-linux OS support strategy). Integrating these two modules would open the gates to sharing more code with rust-vmm, but that work remains low priority for crosvm.