Re: [Qemu-devel] [RFC PATCH v1 00/13] CPU and Memory hotplug for PowerPC guests

[Tyrel Datwyler <tyreld@linux.vnet.ibm.com>]

On 01/07/2015 10:10 PM, Bharata B Rao wrote:
> This patchset enables CPU and memory hotplug support for PowerPC guests.

I missed seeing this as the qemu-ppc list was not included. Can you
please add myself and Nathan on Cc in the future as well.

Tyrel

> 
> Changes in this patchset (v1):
> 
> - Based on top of Michael Roth's tree
>   (https://github.com/mdroth/qemu/commits/spapr-hotplug-core) which serves
>   as base for his PCI hotplug patches too.
> - Switched to device_add/del semantics instead of cpu-add.
> - Supporting CPU hot unplug now.
> - Added patches to enable memory hotplug.
> - Added ibm,dynamic-reconfiguration-memory support which is needed for
>   memory hotplug.
> 
> v0 - http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg00752.html
> 
> CPU hotplug
> -----------
> - Works with BE guest, has issues with LE guest. Has been tested on BE host
>   only.
> - Adding a core (and all its threads) in response to device_add command.
>   Similarly removing a core via device_del will remove all the threads.
> - Using Gu Zheng's "reclaim vCPU objects" patch to remove and reuse
>   the vCPU objects after CPUs removal.
>   (Gu Zheng's original patch:
>    http://lists.gnu.org/archive/html/qemu-devel/2014-12/msg01829.html)
> 
> Memory hotplug
> --------------
> - Able to get an LMB added with the current patchset, but there are issues
>   which I am still debugging.
> - Re-using pc-dimm infrastructure (hw/mem/pc-dimm.c) to support memory
>   hotplug on PowerPC.
> - Tested with Nathan Fontenot's memory hotplug kernel patches (with additions
>   to drive memory hotplug from EPOW interrupt path)
>   (https://www.marc.info/?l=linuxppc-embedded&m=141626066317143&w=2)
> 
> Bharata B Rao (11):
>   spapr: Add DRC dt entries for CPUs
>   spapr: Consider max_cpus during xics initialization
>   spapr: Factor out CPU initialization code into realizefn
>   spapr: Support ibm,lrdr-capacity device tree property
>   spapr: CPU hotplug support
>   spapr: Start all the threads of CPU core when core is hotplugged
>   spapr: Enable CPU hotplug for POWER8 CPU family
>   spapr: CPU hot unplug support
>   spapr: Initialize hotplug memory address space
>   spapr: Support ibm,dynamic-reconfiguration-memory
>   spapr: Memory hotplug support
> 
> Gu Zheng (1):
>   cpus, spapr: reclaim allocated vCPU objects
> 
> Michael Roth (1):
>   spapr: enable PHB/CPU/LMB hotplug for pseries-2.3
> 
>  cpus.c                            |  44 +++
>  default-configs/ppc64-softmmu.mak |   1 +
>  hw/ppc/spapr.c                    | 744 ++++++++++++++++++++++++++++++++++----
>  hw/ppc/spapr_events.c             |  11 +-
>  hw/ppc/spapr_hcall.c              |  51 ++-
>  hw/ppc/spapr_rtas.c               |  28 +-
>  include/hw/ppc/spapr.h            |  27 +-
>  include/qom/cpu.h                 |  11 +
>  include/sysemu/kvm.h              |   1 +
>  kvm-all.c                         |  57 ++-
>  target-ppc/translate_init.c       |  50 ++-
>  11 files changed, 918 insertions(+), 107 deletions(-)
>