[libvirt-users] xl extra parameters equivalent for libvirt

[Daniel P. Berrange]

On Mon, May 18, 2015 at 01:28:08PM -0600, Eric Blake wrote:
> On 05/18/2015 01:02 PM, Jim Fehlig wrote:
> > On 05/18/2015 11:35 AM, Emma Anderson wrote:
> >> hi,
> >>
> >> I use xl toolstack to manage vms on a Xen machine, and also pass some
> >> custom parameters when creating a vm, for example:
> >>
> >> xl create vm.cfg ' param="xyz" '
> > 
> > Documentation on create subcommand in the xl man page describes the
> > 'key=value' options as
> > 
> > key=value
> > It is possible to pass key=value pairs on the command line to provide
> > options as if
> > they were written in the configuration file; these override whatever is
> > in the
> > configfile.
> > 
> >>
> >> I am moving to libvirt for vm management. How I can pass those extra
> >> parameters using libvirt?
> > 
> > I'm not aware of similar functionality in libvirt.  You would need to
> > customize the domXML before feeding it to 'virsh create'.
> 
> Qemu domains have that ability, via an XML namespace that adds
> <qemu:commandline>:
> http://libvirt.org/drvqemu.html#qemucommand
> 
> but no one has yet implemented that for Xen domains.  If you want to add
> it, the src/qemu code would be the obvious starting point to copy from.

Yep, if libxl has ability to do some kind of key/value parameter passthrough
from libvirt, it would be totally reasonable to define a libxl: XML namespace
and support that to allow users to do temporary workarounds.


Regards,
Daniel
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