Re: [RFC PATCH 1/5] nvme-pci: add function nvme_submit_vf_cmd to issue admin commands for VF driver.

[Christoph Hellwig]

On Sun, Dec 11, 2022 at 01:39:37PM +0200, Max Gurtovoy wrote:
> 1. Need to define a concept of a "virtual subsystem". A primary controller 
> will be able to create a virtual subsystem. Inside this subsystem the 
> primary controller will be the master ("the controlling") of the migration 
> process. It will also be able to add secondary controllers to this virtual 
> subsystem and assign "virtual controller ID" to it.
> something like:
> - nvme virtual_subsys_create --dev=/dev/nvme1 --virtual_nqn="my_v_nqn_1" 
> --dev_vcid = 1
> - nvme virtual_subsys_add --dev=/dev/nvme1 --virtual_nqn="my_v_nqn_1" 
> --secondary_dev=/dev/nvme2 --secondary_dev_vcid=20

Yes. Note that there is a bit more state than just the NQN.  You also
need at least a serial number, and also probably a different vendor
ID (the PCI vendor ID that is also mirror in Identify Controller and
the IEEE OUI), and new unique namespace identifier.