[v4,0/8] ARM virt: ACPI memory hotplug support
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Message ID 20190409102935.28292-1-shameerali.kolothum.thodi@huawei.com
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  • ARM virt: ACPI memory hotplug support
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Shameerali Kolothum Thodi April 9, 2019, 10:29 a.m. UTC
This series is an attempt to provide device memory hotplug support 
on ARM virt platform. This is based on Eric's recent works here[1]
and carries some of the pc-dimm related patches dropped from his

The kernel support for arm64 memory hot add was added recently by
Robin and hence the guest kernel should be => 5.0-rc1.

NVDIM support is not included currently as we still have an unresolved
issue while hot adding NVDIMM[2]. However NVDIMM cold plug patches
can be included, but not done for now, for keeping it simple.

This makes use of GED device to sent hotplug ACPI events to the
Guest. GED code is based on Nemu. Thanks to the efforts of Samuel and
Sebastien to add the hardware-reduced support to Nemu using GED
device[3]. (Please shout if I got the author/signed-off wrong for
those patches or missed any names).

This is sanity tested on a HiSilicon ARM64 platform and appreciate
any further testing.


[1] https://patchwork.kernel.org/cover/10837565/
[2] https://patchwork.kernel.org/cover/10783589/
[3] https://github.com/intel/nemu/blob/topic/virt-x86/hw/acpi/ged.c

v3 --> v4
Addressed comments from Igor and Eric,
-Renamed "virt-acpi" to "acpi-ged".
-Changed ged device parent to TYPE_DEVICE.
-Introduced DT memory node property "hotpluggable" to resolve device
 memory being treated as early boot memory issue(patch #7).
-Combined patches #3 and #9 from v3 into #3.

v2 --> v3

Addressed comments from Igor and Eric,
-Made virt acpi device platform independent and moved
 to hw/acpi/generic_event_device.c
-Moved ged specific code into hw/acpi/generic_event_device.c
-Introduced an opt-in feature "fdt" to resolve device-memory being
 treated as early boot memory.
-Dropped patch #1 from v2.

RFC --> v2

-Use GED device instead of GPIO for ACPI hotplug events.
-Removed NVDIMM support for now.
-Includes dropped patches from Eric's v9 series.

Eric Auger (1):
  hw/arm/virt: Add memory hotplug framework

Samuel Ortiz (2):
  hw/acpi: Do not create memory hotplug method when handler is not
  hw/acpi: Add ACPI Generic Event Device Support

Shameer Kolothum (5):
  hw/acpi: Make ACPI IO address space configurable
  hw/arm/virt: Enable device memory cold/hot plug with ACPI boot
  hw/arm/virt-acpi-build: Add PC-DIMM in SRAT
  hw/arm/boot: Add "hotpluggable" property to DT memory node
  hw/arm/boot: Expose the PC-DIMM nodes in the DT

 default-configs/arm-softmmu.mak        |   5 +
 hw/acpi/Kconfig                        |   4 +
 hw/acpi/Makefile.objs                  |   1 +
 hw/acpi/generic_event_device.c         | 311 +++++++++++++++++++++++++++++++++
 hw/acpi/memory_hotplug.c               |  35 ++--
 hw/arm/boot.c                          |  64 ++++++-
 hw/arm/virt-acpi-build.c               |  18 ++
 hw/arm/virt.c                          | 102 ++++++++++-
 hw/i386/acpi-build.c                   |   3 +-
 include/hw/acpi/generic_event_device.h | 121 +++++++++++++
 include/hw/acpi/memory_hotplug.h       |   9 +-
 include/hw/arm/virt.h                  |   4 +
 12 files changed, 654 insertions(+), 23 deletions(-)
 create mode 100644 hw/acpi/generic_event_device.c
 create mode 100644 include/hw/acpi/generic_event_device.h