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Migration state transfer interface is only used by vhost-user-fs, so the interface needs to be defined only when vhost is built. But I need to use this interface with virtio-net and vhost is not always enabled, and to avoid undefined reference error during build, define stub functions for vhost_supports_device_state(), vhost_save_backend_state() and vhost_load_backend_state(). Cc: Hanna Czenczek <hreitz@redhat.com> Signed-off-by: Laurent Vivier <lvivier@redhat.com> Message-Id: <20250115135044.799698-2-lvivier@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>