Re: [Xen-devel] [PATCH v2 3/3] libxl: add domain config parameter to force start of qemu

[Juergen Gross <jgross@xxxxxxxx>]

On 28/03/16 16:50, Konrad Rzeszutek Wilk wrote:
> On Tue, Mar 22, 2016 at 08:29:23AM +0100, Juergen Gross 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.
> 
> .. s/devices/PV devices/
> 
> As surely PV guests can't use emulated devices. Or could they? That
> would be quite interesting in a not kind of fun way.

Would require some work.

> 
>>
>> 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.
> 
> But you are not using this now (late start of QEMU), so why this patch?

This was the reason for the patch: start the device model early in order
to have it running in case it would be needed later.

Juergen

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