Re: [Xen-devel] [PATCH] libxl: allow an <emulator> to be selected in the domain config XML

[David Scott <dave.scott@xxxxxxxxxxxxx>]

On 01/05/13 09:46, Ian Campbell wrote:
> I would suggest that libvirt+libxl expose the version as the "emulator"
> option and not the path. Just leave the path as the default in the
> normal case. You may also want to provide an extra
> emulator-path-override tag/attribute/XML for advanced users, but that's
> up to you.
>
> If you need to support upgrade from xend then you could perhaps treat
> <emulator> values not in the set of valid LIBXL_DEVICE_MODEL_VERSION
> string (currently "qemu-xen" and "qemu-xen-traditional") as a path to a
> qemu-xen-traditional device model -- no xend user can possibly have been
> using the new device model with xend. Or you could take the approach
> that xl does and just warn.
This would work for me: it doesn't seem too bad to consider "qemu-xen" 
and "qemu-xen-traditional" as special virtual paths. It's a useful 
observation that xend never supported the new device model. Jim: should 
I cook up patch v3? :-)
Slightly tangentially, do you anticipate the list of valid 
LIBXL_DEVICE_MODEL_VERSIONs expanding in future? For example, will it be 
used to differentiate between different major versions of qemu?
Cheers,
Dave

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