[Qemu-devel] [RFC PATCH v0 0/5] spapr-next: Memory hotplug updates

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

This patchset includes some updates to sPAPR memory hotplug code that
currently resides in spapr-next branch of David Gibson's tree.

The main change here is to use drc-count hotplug identifier type for memory
hotplug. Currently we use drc-index type of hotplug identifier for
memory, which means that we send one EPOW event to guest on hotplug
of each LMB. Guest kernel has limited buffer space to hold these events
and we can easily overflow this buffer leading to missing of memory
hotplug events. After we switch to drc-count type of hotplug identifier,
we will send only one event to guest on hotplugging each pc-dimm device
thereby reducing the chances of guest rtas buffer overflow. This change
allows us to hotplug huge amounts of memory (>16G) in one pc-dimm
hotplug request.

Another change here is to not include information about memory specified
using -m option in ibm,drc-names, ibm,drc-indexes and
ibm,dynamic-memory-reconfiguration nodes thus having only truly DR capable
memory in these DT nodes/properties.

Bharata B Rao (5):
  spapr: Provide better error message when slots exceed max allowed
  spapr: Populate ibm,associativity-lookup-arrays correctly for non-NUMA
  spapr: Revert to memory@XXXX representation for non-hotplugged memory
  spapr: Support hotplug by specifying DRC count
  spapr: Move memory hotplug to RTAS_LOG_V6_HP_ID_DRC_COUNT type

 hw/ppc/spapr.c         | 58 +++++++++++++-------------------------------------
 hw/ppc/spapr_events.c  | 47 ++++++++++++++++++++++++++++++++--------
 hw/ppc/spapr_pci.c     |  4 ++--
 include/hw/ppc/spapr.h |  8 +++++--
 4 files changed, 61 insertions(+), 56 deletions(-)

-- 
2.1.0