[PATCH RFC v2] nvme: basic RMEDIA support for host

[Hannes Reinecke]

On 7/26/24 00:59, Damien Le Moal wrote:
> On 7/25/24 23:10, Christoph Hellwig wrote:
>> On Thu, Jul 25, 2024 at 09:43:45AM +0900, Damien Le Moal wrote:
>>> Why not do that now in another patch, at least for the loop target ?
>>> Given that they are not that many NVMe-HDD out there, that would be
>>> nice to have to test this.
>>
>> The code would be in the bdev backend, so it applies to all transport
>> equally.  And yes, I'd love to see a patch for that to, but I don't
>> want to gate a simple flag check on it.
> 
> OK. Will look into it then. I have the setup to test this anyway.
> 
> That said, while setting only the rotational media bit should be fairly easy, I
> am worried about spec compliance as setting that flag to 1 mandates support for
> endurance groups as well. Do we care about this ? I am tempted to say no but not
> following the specs is generally a dangerous path we do not want to follow...
> 
I'd got for the usual minimal-viable implementation way like adding 
static logpages for the endurance group information (with just a single 
endurance group '1') and for endurance group event aggregate (with no 
events :-).

Shouldn't blow up the code _that_ much.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
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