[Bug 1854910] [NEW] Support VHDX differencing images (ie images with backing)

[Mark Zealey]

Public bug reported:

The qemu vhdx driver does not support type 2 (differencing) vhdx images
(usually stored with file extension .avhdx). This means that any hyperv
images with snapshots are not supported by qemu-img. It would be great
to be able to convert to a new qcow image from a backing + set of
differencing images from hyperv, and/or convert an individual
differencing vhdx image to a qcow2 image with a backing file specified.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1854910

Title:
  Support VHDX differencing images (ie images with backing)

Status in QEMU:
  New

Bug description:
  The qemu vhdx driver does not support type 2 (differencing) vhdx
  images (usually stored with file extension .avhdx). This means that
  any hyperv images with snapshots are not supported by qemu-img. It
  would be great to be able to convert to a new qcow image from a
  backing + set of differencing images from hyperv, and/or convert an
  individual differencing vhdx image to a qcow2 image with a backing
  file specified.

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