Re: [Qemu-devel] [PATCH v5 0/7] QEMU memory hot unplug support

[Zhu Guihua]

Question:

When migrating from old qemu to one with this hot remove feature, I found
this feature would not work any more in new qemu.

The reason is that DSDT table will not re-generate in new qemu when 
migration.
So the hot remove will not work in the new qemu even though qemu
has this feature.

Is it possible to re-generate dsdt table when migration?

Thanks,
Zhu




On 03/27/2015 05:20 PM, Zhu Guihua wrote:
> Memory hot unplug are both asynchronous procedures.
> When the unplug operation happens, unplug request cb is called first.
> And when guest OS finished handling unplug, unplug cb will be called
> to do the real removal of device.
>
> v5:
>   -reorganize the patchset
>   -add documentation to understand patch easily
>   -add MEMORY_SLOT_EJECT for initiating device eject
>   -add support to send qmp event to notify mgmt about memory unplug error
>
> v4:
>   -reorganize the patchset
>   -drop the new API acpi_send_gpe_event()
>   -update ssdt-mem
>
> v3:
>   -commit message changes
>   -reorganize the patchset, squash and separate some patches
>   -update specs about acpi_mem_hotplug
>   -first cleanup external state, then un-map and un-register memory device
>
> v2:
>   -do a generic for acpi to send gpe event
>   -unparent object by PC_MACHINE
>   -update description in acpi_mem_hotplug.txt
>   -combine the last two patches in the last version
>   -cleanup external state in acpi_memory_unplug_cb
>
> Tang Chen (3):
>    acpi, mem-hotplug: add acpi_memory_slot_status() to get MemStatus
>    acpi, mem-hotplug: add unplug request cb for memory device
>    acpi, mem-hotplug: add unplug cb for memory device
>
> Zhu Guihua (4):
>    docs: update documentation for memory hot unplug
>    acpi: extend aml_field() to support UpdateRule
>    acpi: add hardware implementation for memory hot unplug
>    qmp-event: add event notification for memory hot unplug error
>
>   docs/memory-hotplug.txt           | 24 ++++++++--
>   docs/qmp/qmp-events.txt           | 17 +++++++
>   docs/specs/acpi_mem_hotplug.txt   | 32 ++++++++++++--
>   hw/acpi/aml-build.c               |  4 +-
>   hw/acpi/ich9.c                    | 19 ++++++--
>   hw/acpi/memory_hotplug.c          | 93 ++++++++++++++++++++++++++++++++++++---
>   hw/acpi/piix4.c                   | 17 +++++--
>   hw/core/qdev.c                    |  2 +-
>   hw/i386/acpi-build.c              | 25 ++++++++---
>   hw/i386/acpi-dsdt-mem-hotplug.dsl | 13 +++++-
>   hw/i386/pc.c                      | 62 ++++++++++++++++++++++++--
>   include/hw/acpi/aml-build.h       | 10 ++++-
>   include/hw/acpi/memory_hotplug.h  | 12 +++++
>   include/hw/acpi/pc-hotplug.h      |  3 ++
>   include/hw/qdev-core.h            |  1 +
>   monitor.c                         |  1 +
>   qapi/event.json                   | 14 ++++++
>   trace-events                      |  2 +
>   18 files changed, 315 insertions(+), 36 deletions(-)