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4efb8b7951
Quoting the spec:
> If VHOST_USER_PROTOCOL_F_REPLY_ACK is negotiated, and the back-end
> sets the VHOST_USER_NEED_REPLY flag, the front-end must respond with
> zero when operation is successfully completed, or non-zero
> otherwise.
cloud-hypervisor would previously not send a response to a
VHOST_USER_BACKEND_CONFIG_CHANGE_MSG message, even if
VHOST_USER_PROTOCOL_F_REPLY_ACK had been negotiated and
VHOST_USER_NEED_REPLY was set, in violation of the spec.
Link: https://qemu-project.gitlab.io/qemu/interop/vhost-user.html#back-end-message-types
Fixes: 8d6213338 ("virtio-devices: generic-vhost-user: Config change notification")
Signed-off-by: Alyssa Ross <hi@alyssa.is>