On Wed, 8 Oct 2014, Matias Bjørling wrote:
> NVMe devices are identified by the vendor specific bits:
>
> Bit 3 in OACS (device-wide). Currently made per device, as the nvme
> namespace is missing in the completion path.

The NVM-Express 1.2 actually defined this bit for Namespace Management,
so I don't think we can use bits the spec marked as "reserved". Maybe
you can trigger off some vendor specific Command Set Supported instead.