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

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?


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