Re: [Xen-devel] [PATCH 2/3] libxl: add domain config parameter to force start of qemu

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Thu, Mar 10, 2016 at 3:00 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
> Today the device model (qemu) is started for a pv domain only in case
> a device requiring qemu is specified in the domain configuration
> (qdisk, vfb, channel). If there is no such device the device model
> isn't started and hence it is possible to add such a device to the
> domain later.
>
> Add a domain configuration parameter to specify the device model is
> to be started in any case. This will enable adding devices with a
> qemu based backend later.
>
> While the optimal solution would be to start the device model
> automatically when needed this would require some major rework of
> libxl at multiple places.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

So wait -- what happens now if you try to attach a disk with a qdisk
backend to a PV guest that didn't start with qemu running?

I'd really like to see patch 3 get in, but I'm not really in favor of
this sort of a user-visible hack, particularly as we have to support
it in libxl more or less indefinitely.

 -George

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