Re: [Xen-devel] [PATCH 0/4] (Refactored) VHD Support Addition

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

On Thu, Jun 21, 2007 at 01:27:32PM -0400, Ben Guthro wrote:
> [PATCH 0/4] (Refactored) VHD Support addition
> The patches that follow implement Microsoft's VHD format support, and
> apply to xen-unstable.hg CS 15414:3827b12d24dd
> Per Mark McLoughlin's suggestions - these have been reworked to use the 
> tapaio wrapper.
> 
> This is based on the VHD format spec covered by Microsoft's "Open
> Specification Promise":
> http://www.microsoft.com/interop/osp/default.mspx
> MS VHD Spec can be found at the following link:
> http://download.microsoft.com/download/f/f/e/ffef50a5-07dd-4cf8-aaa3-442c0673a029/Virtual%20Hard%20Disk%20Format%20Spec_10_18_06.doc
> 
> It is divided up into the following patches:
> qemu-vhd-support.patch        [1/4]
> tapdisk-vhd-support.patch     [2/4]
> blktap-fixes.patch            [3/4]
> vdisk-support.patch           [4/4]
> 
> ### libvdisk ####
> These patches implement a shared library (libvdisk) between qemu, and
> blktap which can be expanded upon for additional formats in the future.
> This was done in order to avoid code duplcation between the two areas.
> At this time, it only supports the vhd format.
> 
> ### vdisk_tool ###
> The vdisk_tool provides a means of creating, and converting vhd files.
> Like libvdisk, it is designed with future support of additional formats
> in mind, but currently only supports vhd.

Why not just add vhd support to qemu's existing qemu-img tool, then it will
support all image formats, right from the start, rather than inventing yet
another tool :-(

Any changes to QEMU should be sent to the QEMU upstream mailing lists for
review/inclusion too, otherwise the Xen fork gets even worse than it 
already is

Dan.
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