Re: [Qemu-ppc] [RFC PATCH v4 00/11] sPAPR CPU hotplug

[David Gibson]

On Thu, Aug 06, 2015 at 10:57:06AM +0530, Bharata B Rao wrote:
> Hi,
> 
> This is the next version of CPU hotplug support patchset for PowerPC
> sPAPR guests. This is a split-out from the previous version (v3) that
> was carrying CPU and memory hotplug together. This patchset applies on
> spapr-next branch of David Gibson's tree.
> 
> In the previous version, I was doing CPU addition at socket granularity.
> One hotplug request would add one complete CPU socket with all the cores
> and threads as per the boot time topology specification. Based on the
> feedback for v3, I am switching back to earlier method wherein I don't
> have the notion of socket device. In this version I don't create any
> additional device abstraction over CPU device, but use the existing
> CPU device and add full cores at once. One hotplug request will add
> a complete core with all the underlying threads.
> 
> I have enabled device_add based hotplug for POWER8 family for processors
> and currently the semantics looks like this:
> 
> (qemu) device_add POWER8-powerpc64-cpu,id=cpu8

I've cherry picked 5/11 (add 2.5 machine type) since we'll be wanting
it one way or another.  I have rearranged it, though, to go before the
memory hotplug patches, which are already in spapr-next, but missed
the 2.4 cutoff so shouldn't be enabled for the 2.4 machine type.

Need to wait until I have a little more time to review the rest of the
series.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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