[Engine-devel] direct manipulation of libvirt

[Dead Horse]

It would be nice to be able to enable certain types of VM's (or just
purposely for whatever reason) to be able to use for example:
VEPA (macvtap)
Change VRAM sizes
change disk IO policies
change dsk Cache Policies
change input type to usbtablet or PS2
(new qemu/libvirt features to play or test)

This of course should be limited to admin level roles as it would come with
the understanding of the possibility of things exploding in ones face.

Perhaps this could be implemented as a "Really Advanced Options" on a VM
visible to superuser or admin roles only?

 -DHC



On Sun, Aug 4, 2013 at 2:49 AM, Noam Slomianko <nslomian at redhat.com> wrote:

> Since you cannot know what kind of changes the user will do in libvirt you
> cannot be sure that VDSM will be able to live with them.
> By "Allowing" this officially you will create an impression that it is
> safe, which will cause frustration for the user if VDSM breaks.
> So keeping this as "do at your own risk, we want nothing to do with it"
> sounds like a good plan to me :)
>
> But ignoring that, what kind of behaviour would you like? maybe the
> ability to pass custom libvirt flags on VM startup?
> This can be pretty easily Implemented as an all purpose hook, isn't it?
> (write once, pass any argument you like)
>
> ----- Original Message -----
> From: "Dead Horse" <deadhorseconsulting at gmail.com>
> To: "engine-devel" <engine-devel at ovirt.org>
> Sent: Friday, August 2, 2013 7:43:31 PM
> Subject: [Engine-devel] direct manipulation of libvirt
>
> A broad question here, perhaps not a possibility but I figured I would
> toss it out there anyway.
>
> VDSM is great at what it does, however there are those times when direct
> manipulation of libvirt or libvirt VM configuration would be very handy.
> The safe defaults and tested VM configurations that VDSM/ovirt provides are
> great. However at times it would be nice to simply connect to a hypervisor
> managed by ovirt/vdsm and make a couple changes to a VM (via virt-manager
> or directly via virsh).
>
> This could be enabling a new feature that has made it's way into
> QEMU/libvirt/KVM or tweaking a VM configuration for whatever reason. Now
> there is nothing stopping someone from doing this now either directly or
> via VDSM hooks. Hooks are a pain along with the custom properties to jack
> them into engine. Direct manipulation of libvirt since it has been
> upstarted by vdsm results in an unhappy VDSM/engine.
>
> Thoughts?
> - DHC
>
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