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

On Feb 3, 2012, at 6:31 AM, Jan Beulich wrote:

>>>> On 03.02.12 at 06:24, "Justin T. Gibbs" <justing@xxxxxxxxxxxxxxxx> wrote:
> These being mostly meaningless to non-Linux, I don't think they
> belong here.
> Jan

[blkif major number #defines deleted]

Front and backends must use some common convention for communicating this
virtual device mapping.  Since Linux was the first Dom0, all blkif drivers that 
aware of, regardless of OS platform, reference the Linux values.

The mapping really only matters for HVM guests and the hand-off between a
QEMU emulated device and the PV driver.  To avoid confusion (e.g. name of
root mount device, device names in fstab), the PV drivers export alias devices 
to match the devices QEMU emulates.  The only way to do this successfully is to
know the major number scheme used by  Dom0/QEMU.

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