[PATCH 00/10] pseries NUMA distance rework

[Daniel Henrique Barboza]

Hi,

This series implements a new approach to the NUMA code in
the spapr machine. We're now able to make an attempt to
try to take user input in consideration, instead of ignoring
any user input regarding NUMA distance.

This series was rebased upon David's ppc-for-5.2 tree. More
information about what are being done here can be found in
the specs/ppc-spapr-numa.rst file (only available in David's
branch ATM). This is also available in [1].

First patch is the patch from Cornelia that added the 5.2 machine
type. I included it here because I built upon it for compatibility
code.

Second patch adds a flag to hw/core/numa.c to forbid assymetrical
topologies for the spapr machine, since we do not support that.

All other patches are focused on cleanups/code juggling and
the actual implementation inside the ppc/spapr files.

With this patch, we're now able to at least attempt to honor
user input. Patch 10 has examples of how the code is working
and what is to expect and, most important, what to not
expect.

NOTE: for anyone willing to test this series, be warned that there
is a bug in the Linux kernel, causing any associativity information
for the node 0 to be discarded. A patch was sent in [2] to try to 
fix that.


[1] https://github.com/danielhb/qemu/tree/spapr_numa_v1
[2] 
https://lore.kernel.org/linuxppc-dev/20200814203413.542050-1-danielhb413@gmail.com/T/#m5c85daff828d8c8156781f9f957ad04903e93151

Cornelia Huck (1):
  hw: add compat machines for 5.2

Daniel Henrique Barboza (9):
  numa: introduce MachineClass::forbid_asymmetrical_numa
  spapr: robustify NVLink2 NUMA node logic
  spapr: add spapr_machine_using_legacy_numa() helper
  spapr: make ibm,max-associativity-domains scale with user input
  spapr: allow 4 NUMA levels in ibm,associativity-reference-points
  spapr: create helper to set ibm,associativity
  spapr: introduce SpaprMachineClass::numa_assoc_domains
  spapr: consider user input when defining spapr guest NUMA
  specs/ppc-spapr-numa: update with new NUMA support

 docs/specs/ppc-spapr-numa.rst | 213 ++++++++++++++++++++++++++++++
 hw/arm/virt.c                 |   9 +-
 hw/core/machine.c             |   3 +
 hw/core/numa.c                |   7 +
 hw/i386/pc.c                  |   3 +
 hw/i386/pc_piix.c             |  14 +-
 hw/i386/pc_q35.c              |  13 +-
 hw/ppc/spapr.c                | 239 +++++++++++++++++++++++++++++-----
 hw/ppc/spapr_hcall.c          |  13 +-
 hw/ppc/spapr_nvdimm.c         |  19 ++-
 hw/ppc/spapr_pci.c            |  42 +++++-
 hw/ppc/spapr_pci_nvlink2.c    |  10 +-
 hw/s390x/s390-virtio-ccw.c    |  14 +-
 include/hw/boards.h           |   4 +
 include/hw/i386/pc.h          |   3 +
 include/hw/pci-host/spapr.h   |   2 +
 include/hw/ppc/spapr.h        |  12 +-
 include/hw/ppc/spapr_nvdimm.h |   5 +-
 18 files changed, 568 insertions(+), 57 deletions(-)

-- 
2.26.2