Re: [Xen-devel] [RFC PATCH] blkif.h: document scsi/0x12/0x83 node

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 17/03/16 11:12, Ian Jackson wrote:
> David Vrabel writes ("Re: [Xen-devel] [RFC PATCH] blkif.h: document 
> scsi/0x12/0x83 node"):
>> On 16/03/16 13:59, Bob Liu wrote:
>>> But we'd like to get the VPD information(of underlying storage device) also 
>>> in Linux blkfront, even blkfront is not a SCSI device.
>>
>> Why does blkback/blkfront need to involved here?  This is just some
>> xenstore keys that can be written by the toolstack and directly read by
>> the relevant application in the guest.
> 
> I'm getting rather a different picture here than at first.  Previously
> I thought you had some 3rd-party application, not under your control,
> which expected to see this VPD data.

Bob != David?

> But now I think that you're saying the application is under your own
> control.  I don't understand why synthetic VPD data is the best way to
> give your application the information it needs.
> 
> What is the application doing with this VPD data ?  I mean,
> which specific application functions, and how do they depend on the
> VPD data ?

David


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