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

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

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.

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 ?

Ian.

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