Re: [Xen-devel] [PATCH 3 of 5] blkif.h: Add definitions for virtual block device major numbers

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> QEMU emulates primary and secondary IDE master+slave, it has no concept
> of a major or minor number. Why does the dom0 numbering scheme
> matter?

For Windows PV drivers I parse the vbd number so I can extract the disk number 
which is then present as the scsi target id. I'd prefer if vbd-interface.txt 
remained the canonical place where the numbering scheme is specified though. 
Putting definitions into blkif.h just weakens that position.

  Paul

> (Does this relate to the old, or possibly current, xend misbehaviour of
> stat()ing the dom0 device while creating a domain?)
> 
> On Linux we treat d0-d3 (however they are specified) as aliasing those 4 IDE
> devices (although we don't actual present alias devices but instead use UUID
> or LABEL based fstab etc).
> 
> Whatever non-Linux does for weird compatibility reasons here I think the
> right place to document it would be in docs/misc/vbd-interface.txt
> following the precedent of the "Notes on Linux as a guest" in that
> document.
> 
> Ian.
> 
> 
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