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Re: [Qemu-devel] [RFC PATCH v1 00/13] CPU and Memory hotplug for PowerPC
From: |
Tyrel Datwyler |
Subject: |
Re: [Qemu-devel] [RFC PATCH v1 00/13] CPU and Memory hotplug for PowerPC guests |
Date: |
Thu, 29 Jan 2015 14:14:48 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0 |
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(-)
>