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Re: [libvirt] [PATCH 1/3] qemu: add capability for vhost-net busy polling

On 06/17/2017 09:15 PM, Eduardo Habkost wrote:
> (CCing qemu-devel and the QAPI maintainers.  I have a question
> about introspection below.)

> Fortunately, netdev options are modelled in the QAPI schema as
> union Netdev.  However, 'query-qmp-schema' doesn't seem to
> include union Netdev because it is not referenced by any QMP
> command or event.

I've posted patches in the past (qemu 2.6 timeframe, if I recall) that
changed netdev_add into a fully-advertised interface, but we didn't take
it then because we weren't sure how to handle the fact that netdev_add
can currently accept both an integer (1) and a string ("1") as
identical, and we didn't want to risk breaking clients that passed a
string when the promoted command would only accept integers.  I guess we
should revive that.

> Markus, Eric, Michael: is there any way libvirt can query the
> definition of union Netdev from the schema with current QEMU?

Really, we need to promote netdev_add to a full-fledged QMP command.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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