[PATCH v2] nvme: reserve a keep-alive admin tag for all transports

[Christoph Hellwig]

On Thu, May 21, 2026 at 08:38:29AM -0600, Keith Busch wrote:
> This command is already special since we filter for it on the completion
> side. We may want to selectively filter other Set Feature commands too.
> For example, we don't want user space turning on Host Dispersed
> Namespace Support, because this driver is not going to correctly react
> to that one either.

True.  So maybe start filtering out all these things will go wrong
commands.  Chao, can you start on that for keep alive?  We can then
extend it as needed.