[Xen-devel] When is "physical-device" created in xenstore?

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

Saw a strange problem. When blkfront writes event channel number and
ring-ref to xenstore, the watch registered by blkback is notified.
However immediately watch handler in blkback found there's no
"physical-device" under xenstore which should refer to major/minor
number of device for domU. Then failed to create vbd and finally the
connection can't be setup.

So my puzzle is, when should physical-device be created? And who creates
this item? I searched for name string in whole tools directory to only
find instance in block-file/block-phy/block-endb. I configured disk
image by /dev/loop0, so ideally block-phy should be used. However I
still failed to find where block-phy is invoked.

Any clues?

Thanks,
Kevin

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