On Thu, Jun 06, 2013 at 11:16:53AM +0800, liguang wrote: > v2: > 1.remove PIIX4_PROC_BASE operations for cpu hotplug > 2.fix wrong description fo cpu-del > > 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.
So, it's another channel to the guest. Can't qemu-ga do this in userspace, using the existing channel? > 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: > > hotplug > qemu::ec::sci -> kernel::ec::gpe::notifier-> > kernel::cpu_physic_hotplug::handler->kernel::cpu_up > > unplug > kernel::cpu_down::kernel::cpu_physic_hotplug::handler-> > kernel::ec::ec_write->qemu::ec::->qemu::cpu-unplug > > sorry, I should poll cpu-unplug cmd sent from kernel, > but, it's a little trivial, I want do it later. > > for kernel patches: > http://comments.gmane.org/gmane.linux.kernel/1503460 > > > Li Guang (8) > 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 > cpu-hotplug: remove memory regison for cpu hotplug > > 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 | 68 ++++++++++++++ > hw/i386/pc.c | 46 ++++++++++++++++++++++++++++-- > hw/i386/pc_piix.c | 7 + > hw/i386/pc_q35.c | 6 + > include/hw/acpi/ec.h | 44 ++++++ > 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, 411 insertions(+), 54 deletions(-) > create mode 100644 hw/acpi/ec.c > create mode 100644 include/hw/acpi/ec.h
