What's new since v7:
* Per Andreas' suggestion dropped DIMMBus concept.
* Added hotplug binding for bus-less devices
* DIMM device is split to backend and frontend. Therefore following
command/options were added for supporting it:
For memory-ram backend:
CLI: -object-add memory-ram,
with options: 'id' and 'size'
For dimm frontend:
option "size" became readonly, pulling it's size from attached backend
added option "memdev" for specifying backend by 'id'
* dropped support for 32 bit guests
* failed hotplug action doesn't consume 1 slot anymore
* vaious fixes adressing reviewer's comments most of them in ACPI part
---
This series allows to hotplug 'arbitrary' DIMM devices specifying size,
NUMA node mapping (guest side), slot and address where to map it, at runtime.
Due to ACPI limitation there is need to specify a number of possible
DIMM devices. For this task -m option was extended to support
following format:
-m [mem=]RamSize[,slots=N,maxmem=M]
To allow memory hotplug user must specify a pair of additional parameters:
'slots' - number of possible increments
'maxmem' - max possible total memory size QEMU is allowed to use,
including RamSize.
minimal monitor command syntax to hotplug DIMM device:
object_add memory-ram,id=memX,size=1G
device_add dimm,id=dimmX,memdev=memX
DIMM device provides following properties that could be used with
device_add / -device to alter default behavior:
id - unique string identifying device [mandatory]
slot - number in range [0-slots) [optional], if not specified
the first free slot is used
node - NUMA node id [optional] (default: 0)
size - amount of memory to add, readonly derived from backing memdev
start - guest's physical address where to plug DIMM [optional],
if not specified the first gap in hotplug memory region
that fits DIMM is used
-device option could be used for adding potentially hotunplugable DIMMs
and also for specifying hotplugged DIMMs in migration case.
Tested guests:
- RHEL 6x64
- Windows 2012DCx64
- Windows 2008DCx64
Known limitations/bugs/TODOs:
- hot-remove is not supported, yet
- max number of supported DIMM devices 255 (due to ACPI object name
limit), could be increased creating several containers and putting
DIMMs there. (exercise for future)
- e820 table doesn't include DIMM devices added with -device /
(or after reboot devices added with device_add)
- Windows 2008 remembers DIMM configuration, so if DIMM with other
start/size is added into the same slot, it refuses to use it insisting
on old mapping.
QEMU git tree for testing is available at:
https://github.com/imammedo/qemu/commits/memory-hotplug-v8
Example QEMU cmd line:
qemu-system-x86_64 -enable-kvm -monitor unix:/tmp/mon,server,nowait \
-m 4096,slots=4,maxmem=8G guest.img
PS:
Windows guest requires SRAT table for hotplug to work so add an extra option:
-numa node
to QEMU command line.
Igor Mammedov (34):
vl: convert -m to QemuOpts
object_add: allow completion handler to get canonical path
add memdev backend infrastructure
vl.c: extend -m option to support options for memory hotplug
add pc-{i440fx,q35}-2.1 machine types
pc: create custom generic PC machine type
qdev: hotplug for buss-less devices
qdev: expose DeviceState.hotplugged field as a property
dimm: implement dimm device abstraction
memory: add memory_region_is_mapped() API
dimm: do not allow to set already busy memdev
pc: initialize memory hotplug address space
pc: exit QEMU if slots > 256
pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS
pc: add memory hotplug handler to PC_MACHINE
dimm: add busy address check and address auto-allocation
dimm: add busy slot check and slot auto-allocation
acpi: rename cpu_hotplug_defs.h to acpi_defs.h
acpi: memory hotplug ACPI hardware implementation
trace: add acpi memory hotplug IO region events
trace: add DIMM slot & address allocation for target-i386
acpi:piix4: make plug/unlug callbacks generic
acpi:piix4: add memory hotplug handling
pc: ich9 lpc: make it work with global/compat properties
acpi:ich9: add memory hotplug handling
pc: migrate piix4 & ich9 MemHotplugState
pc: propagate memory hotplug event to ACPI device
pc: ACPI BIOS: punch holes in PCI0._CRS for memory hotplug IO region
pc: ACPI BIOS: name CPU hotplug ACPI0004 device
pc: ACPI BIOS: implement memory hotplug interface
pc: ACPI BIOS: use enum for defining memory affinity flags
pc: ACPI BIOS: reserve SRAT entry for hotplug mem hole
pc: ACPI BIOS: make GPE.3 handle memory hotplug event on PIIX and Q35
machines
pc: ACPI BIOS: update pregenerated ACPI table blobs
Paolo Bonzini (1):
qemu-option: introduce qemu_find_opts_singleton
backends/Makefile.objs | 2 +
backends/hostmem-ram.c | 54 +++
backends/hostmem.c | 110 +++++
default-configs/i386-softmmu.mak | 1 +
default-configs/x86_64-softmmu.mak | 1 +
docs/specs/acpi_mem_hotplug.txt | 44 ++
hw/Makefile.objs | 1 +
hw/acpi/Makefile.objs | 1 +
hw/acpi/ich9.c | 46 ++
hw/acpi/memory_hotplug.c | 184 ++++++++
hw/acpi/piix4.c | 52 ++-
hw/core/qdev.c | 30 ++
hw/i386/Makefile.objs | 3 +-
hw/i386/acpi-build.c | 74 +++-
hw/i386/acpi-dsdt-cpu-hotplug.dsl | 1 +
hw/i386/acpi-dsdt.dsl | 17 +-
hw/i386/acpi-dsdt.hex.generated | 102 ++++-
hw/i386/pc.c | 165 +++++++-
hw/i386/pc_piix.c | 64 ++-
hw/i386/pc_q35.c | 38 +-
hw/i386/q35-acpi-dsdt.dsl | 17 +-
hw/i386/q35-acpi-dsdt.hex.generated | 104 ++++-
hw/i386/ssdt-mem.dsl | 75 ++++
hw/i386/ssdt-mem.hex.generated | 197 +++++++++
hw/i386/ssdt-misc.dsl | 163 ++++++++
hw/i386/ssdt-misc.hex.generated | 809 +++++++++++++++++++++++++++++++++++-
hw/isa/lpc_ich9.c | 33 +-
hw/mem/Makefile.objs | 1 +
hw/mem/dimm.c | 234 +++++++++++
include/exec/memory.h | 8 +
include/hw/acpi/acpi_defs.h | 35 ++
include/hw/acpi/cpu_hotplug.h | 2 +-
include/hw/acpi/cpu_hotplug_defs.h | 32 --
include/hw/acpi/ich9.h | 4 +
include/hw/acpi/memory_hotplug.h | 37 ++
include/hw/boards.h | 10 +
include/hw/i386/pc.h | 59 +++
include/hw/mem/dimm.h | 72 ++++
include/qemu/config-file.h | 2 +
include/sysemu/hostmem.h | 60 +++
memory.c | 15 +-
qemu-options.hx | 14 +-
qmp.c | 11 +-
trace-events | 17 +
util/qemu-config.c | 14 +
vl.c | 145 +++++--
46 files changed, 2987 insertions(+), 173 deletions(-)
create mode 100644 backends/hostmem-ram.c
create mode 100644 backends/hostmem.c
create mode 100644 docs/specs/acpi_mem_hotplug.txt
create mode 100644 hw/acpi/memory_hotplug.c
create mode 100644 hw/i386/ssdt-mem.dsl
create mode 100644 hw/i386/ssdt-mem.hex.generated
create mode 100644 hw/mem/Makefile.objs
create mode 100644 hw/mem/dimm.c
create mode 100644 include/hw/acpi/acpi_defs.h
delete mode 100644 include/hw/acpi/cpu_hotplug_defs.h
create mode 100644 include/hw/acpi/memory_hotplug.h
create mode 100644 include/hw/mem/dimm.h
create mode 100644 include/sysemu/hostmem.h
--
1.9.0
