[ovirt-devel] Update on Domain XML created by the engine

[Fabian Deutsch]

On Thu, Jan 26, 2017 at 5:59 PM, Arik Hadas <ahadas at redhat.com> wrote:
> Hi All,
>
> Yesterday we merged the class LibvirtVmXmlBuilder in ovirt-engine.
> It does not include the conversion of all the previously supported VM
> properties (e.g., payload devices, OVS stuff, cinder disks - any help would
> be appreciated btw) or covers all flows (e.g., run once) yet and there is
> surely a place for improvement, but in its current state LibvirtVmXmlBuilder
> is able to generate a libvirt's domxml on the engine side for many typical
> VMs in our development environment.
>
> If you happen to start working on a change that involves changing something
> in the domxml, please do it by modifying this class. Our plan is to
> deprecate the VM info map/dictionary soon.

That's so nice!

- faian

> Let me try to motivate you by example:
>
> Let's say that you want to add support for a property of a disk called
> 'discard'.
> In 4.1:
> You had to patch VmInfoBuilderImpl to add another element to the VM info map
> and then modify VDSM to use it when encoding the Disk device into XML.
> Now:
> You need to patch LibvirtVmXmlBuilder so the 'discard' property would be set
> on the disk device element in the generated XML.
>
> In order to test such a change you can:
> (1) apply [1] to send the XML generated by the engine to VDSM
> (2) apply [2] to send the XML generated by the engine to libvirt
>
> [1] https://gerrit.ovirt.org/#/c/71088/
> [2] https://gerrit.ovirt.org/#/c/65182/
>
> Regards,
> Arik
>
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