Re: [Xen-devel] [PATCH 03/28] libxl: Provide libxl__dm_support_*

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Mon, 2016-01-11 at 10:00 -0700, Jim Fehlig wrote:
> On 01/07/2016 10:13 AM, Ian Campbell wrote:
> > On Tue, 2015-12-22 at 18:44 +0000, Ian Jackson wrote:
> > > This allows code elsewhere in libxl to find out what options a device
> > > model executable supports.ÂÂThis is done by searching the usage
> > > message for fixed strings.
> > Has anyone (ever, not necessarily a Xen person nor in this context)
> > approached upstream QEMU about a machine readable output of some sort?
> > 
> > I know libvirt does something similar to this, but they want to support
> > older versions, whereas we at least have the luxury of not caring about
> > versions before the point this code lands.
> 
> Since qemu 1.2.0, libvirt has been using the various QMP commands to probe for
> qemu capabilities, instead of parsing help output.

As in it spawns a qemu specifically to ask the questions and then kills it
and starts what it needs _or_ it starts the qemu with minimal command line
cfg and then dynamically pokes in the full config via qmp?

Ian.

> 
> Regards,
> Jim
> 

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