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Re: [Qemu-ppc] [RFC PATCH v1] spapr: Memory hot-unplug support

From: Bharata B Rao
Subject: Re: [Qemu-ppc] [RFC PATCH v1] spapr: Memory hot-unplug support
Date: Wed, 28 Oct 2015 14:47:44 +0530
User-agent: Mutt/1.5.23 (2014-03-12)

On Tue, Oct 27, 2015 at 02:52:13PM -0500, Nathan Fontenot wrote:
> On 10/26/2015 04:53 AM, Bharata B Rao wrote:
> > Add support to hot remove pc-dimm memory devices.
> > 
> > TODO: In response to memory hot removal operation on a DIMM device,
> > guest kernel might refuse to offline a few LMBs that are part of that 
> > device.
> > In such cases, we will have a DIMM device that has some LMBs online and some
> > LMBs offline. To avoid this situation, drmgr could be enhanced to support
> > a command line option that results in removal of all the LMBs or none.
> >
> We had discussed an update to drmgr previously that would allow one to specify
> that they wanted to remove a certain number of LMBs starting at a specified 
> drc
> index. I would assume we could incorporate the notion that it is an all or
> nothing request into that.

Right, but since that requires PAPR spec changes, I thought for now we
could add such an option to drmgr and use that from rtas_errd on PowerKVM
to correctly do memory hot unplug. Not feasible ?


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