Re: [Xen-devel] memory hotplug for domUs

[Juergen Gross <jgross@xxxxxxxx>]

On 03/02/17 14:23, Ian Jackson wrote:
> Juergen Gross writes ("Re: [Xen-devel] memory hotplug for domUs"):
>> As user interface we are starting with "xl mem-set" which will use
>> memory hotplug if necessary and supported by the guest (guest indicates
>> support via a Xenstore entry). A "force" parameter can be used with
>> "xl mem-set" in case there is no support indicated in Xenstore. In the
>> beginning memory hotplug will be supported for pv guests only.
> 
> Right.
> 
>> The memory hotplug functionality is offered by a libxl function which
>> can be used by e.g. libvirt and, of course, by "xl mem-set". Support
>> of memory hotplug by a guest can be tested by another libxl function.
> 
> I would be inclined to suggest that the automatic memory hotplug
> should be implemented in libxl.  I hesistate to suggest atht the
> existing libxl_set_memory_target should do this, so perhaps "xl
> mem-set" should call a new function.

Sure, why not. I'd still like to have an explicit memory hotplug
interface on libxl level. This can be used by the new libxl function
you are suggesting.

>> In case it is needed we can add more xl commands in order to support
>> e.g. special numa functionality.
> 
> Or additional options.

Right.

>> Should we already consider numa parameters at the libxl interface
>> (for now accepting "ANY" parameter only)?
> 
> Yes, certainly.
> 
> Mayb we should ahve a new version of libxl_set_memory_target which
> takes an idl-generated parameter block rather than the existing two
> paraemters, and also new optional numa and hotplus options ?

No objections from me.


Juergen


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