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Re: [Xen-devel] [RFC] support more qdisk types

On Mon, Jan 25, 2016 at 05:25:02PM -0700, Jim Fehlig wrote:
> I would like to hear the community's opinion on supporting more qdisk types in
> xl/libxl, e.g. nbd, rbd, iSCSI, etc. I prefer supporting additional qdisk 
> types
> in libxl over apps like xl or libvirt doing all the setup, producing a block
> device, and then passing that to libxl. Each libxl app would have to
> re-implement functionality already provided by qdisk. libxl already supports
> IDE, AHCI, SCSI, and Xen PV qdisks. My suggestion is to extend that to 
> initially
> include nbd, rbd, and iSCSI. Sheepdog, ssh, etc. could be added in the future.

> I considered several approaches to supporting additional qdisk types, based
> primarily on changes to the disk cfg and interface. At one extreme is to 
> change
> nothing and use the existing 'target=' to encode all required config for the
> additional qdisk types. libxl would need to be taught how to turn the blob 
> into
> an appropriate qdisk. At the other extreme is extending xl-disk-configuration

Either way - new backends would require changes in both libxl and libvirt right?
The libxl would need to understand the new 'target=' blob to parse it out?

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