Re: [Qemu-devel] [RFC PATCH v2 0/2] spapr: Memory hot-unplug support

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting Thomas Huth (2016-05-27 10:48:45)
>  Hi Bharata,
> 
> On 15.03.2016 05:38, Bharata B Rao wrote:
> > This patchset adds memory hot removal support for PowerPC sPAPR.
> > This new version switches to using the proposed "count-indexed" type of
> > hotplug identifier which allows to hot remove a number of LMBs starting
> > with a given DRC index.
> > 
> > This count-indexed hotplug identifier isn't yet part of PAPR.
> 
> Just for clarification / my understanding: That means we also need a
> modified guest to support this new interface? If yes, did you post such
> patches somewhere else already, too?

No patches posted yet, but hopefully soon. These bits will likely be added
as part of an effort that moves all memory hotplug/unplug into guest
kernel instead of relying on drmgr. Most of the bits for in-kernel
memory hotplug are already upstream, but there's a number of other
requirements in the spec update (like a new hotplug interrupt/queue
instead of re-using EPOW) that need to be addressed as part of the
switchover.

> 
>  Thomas
>