1. A method of managing a self-virtualizing input/output (IO) resource in a logically partitioned data processing system, the method comprising: interfacing an adjunct partition associated with the self-virtualizing input/output (IO) resource with a hypervisor through a vendor-independent Adjunct Management Channel (AMC) interface, the adjunct partition including a partition AMC device driver and the hypervisor including a hypervisor AMC device driver configured to interface with the partition AMC device driver over the AMC interface; and in the hypervisor, managing the adjunct partition by communicating a configuration command from the hypervisor to vendor-specific adjunct management program code in the adjunct partition over the AMC interface using the partition and hypervisor AMC device drivers.