* gnu/system/vm.scm (qemu-image): Add #:inputs-to-copy and
#:boot-expression parameters. Honor them. Append INPUTS-TO-COPY to
the #:inputs argument for `expression->derivation-in-linux-vm'.
(example2): Add #:boot-expression and #:inputs-to-copy arguments.
* gnu/packages/qemu.scm (qemu-kvm): Remove.
(qemu): Incorporate parts of QEMU-KVM that used to be inherited.
(qemu-kvm/smb-shares): Rename to...
(qemu/smb-shares): ... this.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Adjust
accordingly.