Re: [PATCH v7 08/14] nvmet-core: allow one host per passthru-ctrl

[Max Gurtovoy]

On 8/22/2019 3:09 AM, Sagi Grimberg wrote:
> > I don't understand why we don't limit a regular ctrl to single access 
> > and we do it for the PT ctrl.
> >
> > I guess the block layer helps to sync between multiple access in 
> > parallel but we can do it as well.
> >
> > Also, let's say you limit the access to this subsystem to 1 user, the 
> > bdev is still accessibly for local user and also you can create a 
> > different subsystem that will use this device (PT and non-PT ctrl).
> >
> > Sagi,
> >
> > can you explain the trouble you meant and how this limitation solve it ?
>
> Its different to emulate the controller with all its admin
> commands vs. passing it through to the nvme device.. (think of format 
> nvm)
we don't need to support format command for PT ctrl as we don't support 
other commands such create_sq/cq.