patch 1 adds ACPI Embedded Controller (EC),
refer-to:
ACPI SPEC v5 chapter 12
"ACPI Embedded Controller Interface Specification"
EC is a standard ACPI device, it plays flexible roles,
especially be event carrier, it can pass events between platform
and OS, so OS can execute _Qxx method which defined
by yourself and query EC's ACPI space which can be a buffer for
many purposes
here, I want to deliver CPU online/offline event between
OS and QEMU for CPU hotplug feature, then we will don't
need to "echo 1 > /sys/devices/system/cpu/cpu1/online"
again after 'cpu-add' and also for offline to do real cpu
removal.
what I am trying to do is emulated physical addition/removal
(like described by linux kernel document for cpu hotplug --
linux-2.6/Documentation/cpu-hotplug.txt) for QEMU.
these RFC patches are sent for demo what I am trying to do.
the design process simply like following:
cpu-add/del --> EC space & sci setting --> kernel EC driver gpe handler
I
V
listen cpu hotplug event
I
V
query EC space for cpu status
I
V
trigger
cpu online/offline process
Li Guang (7)
acpi: add ACPI Embedded Controller support
ich9: add notifer for ec to generate sci
ec: add operations for _Qxx events
piix4: add notifer for ec to generate sci
piix4: add events for cpu hotplug
qmp: add 'cpu-del' command
pc: add EC qdev init for piix & q35
default-configs/x86_64-softmmu.mak | 1 +
hw/acpi/Makefile.objs | 1 +
hw/acpi/ec.c | 225 ++++++++++++++++++++++++++++++++++++
hw/acpi/ich9.c | 15 +++++++++++++++
hw/acpi/piix4.c | 22 ++++++++++++++
hw/i386/pc.c | 30 ++++++++++++++++++++++++++++--
hw/i386/pc_piix.c | 7 +
hw/i386/pc_q35.c | 6 +
include/hw/acpi/ec.h | 39 ++++++
include/hw/acpi/ich9.h | 1 +
include/hw/boards.h | 5 +++--
include/hw/i386/pc.h | 1 +
qapi-schema.json | 13 +++++++++++++
qmp-commands.hx | 23 +++++++++++++++++++++++
qmp.c | 9 +++++++++
15 files changed, 390 insertions(+), 8 deletions(-)
create mode 100644 hw/acpi/ec.c
create mode 100644 include/hw/acpi/ec.h
