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

[Bob Liu <bob.liu@xxxxxxxxxx>]

On 03/16/2016 10:07 PM, Paul Durrant wrote:
>> -----Original Message-----
>> From: Bob Liu [mailto:bob.liu@xxxxxxxxxx]
..snip..
>>>
>>
>> But we'd like to get the VPD information(of underlying storage device) also 
>> in
>> Linux blkfront, even blkfront is not a SCSI device.
>>
>> That's because our underlying storage device has some vendor-specific
>> features which can be recognized through informations in VPD pages.
>> And Our applications in guest want to aware of these vendor-specific
>> features.
> 
> I think the missing piece of the puzzle is how the applications get this 
> information. 
> In Windows, since everything is a SCSI LUN (or has to emulate one) 
> applications just send down 'scsi pass-through' IOCTLs and get the raw 
> INQUIRY data back. 
> In Linux there would need to be some alternative scheme that presumably 
> blkfront would have to support.
> 

They plan to send a REQ_TYPE_BLOCK_PC request down to blkfront, and hoping 
blkfront can handle this request and return the VPD informations.
I'll confirm weather they can read the xenstore node directly.

-- 
Regards,
-Bob

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