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

[Anthony Liguori <anthony@xxxxxxxxxxxxx>]

Steve Ofsthun wrote:
> Daniel P. Berrange wrote:
> > On Thu, Jun 21, 2007 at 01:27:32PM -0400, Ben Guthro wrote:
>
> > > ### 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 :-(
>
> Well, when we started this, it wasn't clear we were going to be able to
> publicly release any code in support of the VHD format.  Microsoft later
> relaxed the restrictions, and by that time the separate tool already
> existed.  We can investigate integrating the work into qemu-img.

QEMU already supports VHD (it calls it VPC) and supported it long before 
Microsoft released any specs.  QEMU supported VMDK before VMware release 
the specs for that too.

Is there a particular feature of VHD/VPC that your code adds that QEMU 
didn't already support?

Regards,

Anthony Liguori

> > 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
>
> Agreed.
>
> Steve


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