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Re: [Qemu-devel] [PATCH 00/27 RFC v7] ACPI memory hotplug
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH 00/27 RFC v7] ACPI memory hotplug |
Date: |
Thu, 21 Nov 2013 15:43:27 +0200 |
On Thu, Nov 21, 2013 at 02:39:10PM +0100, Igor Mammedov wrote:
> On Thu, 21 Nov 2013 08:20:56 +0200
> "Michael S. Tsirkin" <address@hidden> wrote:
>
> > On Thu, Nov 21, 2013 at 03:38:21AM +0100, Igor Mammedov wrote:
> > > ---
> > > What's new since v6:
> > >
> > > * DIMM device is split to backend and frontend. Therefore following
> > > command/options were added for supporting it:
> > >
> > > For memdev backend:
> > > CLI: -memdev-add
> > > Monitor/QMP: memdev-add
> > > 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'
> > >
> > > * Added Q35 support
> > > * Added support for 32 bit guests
> > > * build for i386 emulator (not tested)
> >
> > OK so a large patchset so did not review yet. One question
> > due to the dependency on bios honouring etc/reserved-memory-end: is
> > there some way to detect old BIOS and fail memory hotplug?
> version negotiation between ASL and hardware could be used to that effect.
>
> QEMU could start with present but disabled memory hotplug and if
> QEMU and BIOS ASL could come in agreement that both support it in
> compatible way, it could be enabled.
So at the moment there's no negotiation, is there?
> >
> > > ---
> > >
> > > 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:
> > >
> > > memdev-add 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
> > > - Windows 2008DCx32
> > >
> > > Known limitations/bugs/TODOs:
> > > - only hot-add supported
> > > - 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)
> > > - failed hotplug action consumes 1 slot (device_add doesn't delete
> > > device properly if realize failed)
> > > - 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.
> > >
> > > Series is based on mst's PCI tree and requires following SeaBIOS patch:
> > > http://patchwork.ozlabs.org/patch/292614/
> > > on top of patches to load ACPI tables from QEMU
> > > working SeaBIOS tree for testing is available at:
> > > https://github.com/imammedo/seabios/commits/memhp-wip
> > >
> > > QEMU git tree for testing is available at:
> > > https://github.com/imammedo/qemu/commits/memory-hotplug-v7
> > >
> > > Example QEMU cmd line:
> > > qemu-system-x86_64 -enable-kvm -monitor unix:/tmp/mon,server,nowait \
> > > -m 4096,slots=4,maxmem=8G -L /custome_seabios guest.img
> > >
> > > PS:
> > > Windows guest requires SRAT table for hotplug to work so add extra
> > > option:
> > > -numa node
> > > to QEMU command line.
> > >
> > >
> > > Igor Mammedov (26):
> > > acpi: factor out common pm_update_sci() into acpi core
> > > rename pci_hotplug_fn to hotplug_fn and make it available for other
> > > devices
> > > pc: add 'etc/reserved-memory-end' fw_cfg interface for SeaBIOS
> > > vl: convert -m to qemu_opts_parse()
> > > qapi: add SIZE type parser to string_input_visitor
> > > get reference to /backend container via qemu_get_backend()
> > > add memdev backend infrastructure
> > > dimm: map DimmDevice into DimBus provided address space
> > > dimm: add busy slot check and slot auto-allocation
> > > dimm: add busy address check and address auto-allocation
> > > dimm: add hotplug callback to DimmBus
> > > acpi: memory hotplug ACPI hardware implementation
> > > acpi: initialize memory hotplug ACPI PIIX4 hardware
> > > acpi: piix4: add memory-hotplug-io-base property to piix4_pm
> > > acpi: ich9: allow guest to clear SCI rised by GPE
> > > acpi: initialize memory hotplug ACPI ICH9 hardware
> > > acpi: ich9: add memory-hotplug-io-base property to ich9_pm
> > > acpi: piix4/ich9: add optional vmstate field for MemHotplugState
> > > migration
> > > pc: piix: make PCII440FXState type public
> > > pc: add memory hotplug 440fx machine
> > > pc: add memory hotplug Q35 machine
> > > pc: ACPI BIOS: implement memory hotplug interface
> > > pc: ACPI BIOS: add ssdt-mem.hex.generated and update
> > > ssdt-misc.hex.generated
> > > 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
> > >
> > > Vasilis Liaskovitis (1):
> > > dimm: implement dimm device abstraction
> > >
> > > backends/Makefile.objs | 2 +
> > > backends/hostmem.c | 275 +++++++++++
> > > backends/hostmem_compat_ram.c | 42 ++
> > > default-configs/i386-softmmu.mak | 1 +
> > > default-configs/x86_64-softmmu.mak | 1 +
> > > docs/specs/acpi_mem_hotplug.txt | 38 ++
> > > hmp-commands.hx | 13 +
> > > hw/Makefile.objs | 1 +
> > > hw/acpi/core.c | 189 ++++++++
> > > hw/acpi/ich9.c | 57 ++-
> > > hw/acpi/pcihp.c | 6 +-
> > > hw/acpi/piix4.c | 91 +++--
> > > hw/i386/Makefile.objs | 3 +-
> > > hw/i386/acpi-build.c | 91 ++++-
> > > hw/i386/acpi-dsdt.dsl | 5 +-
> > > hw/i386/pc.c | 90 ++++-
> > > hw/i386/pc_piix.c | 7 +-
> > > hw/i386/pc_q35.c | 4 +
> > > hw/i386/q35-acpi-dsdt.dsl | 5 +-
> > > hw/i386/ssdt-mem.dsl | 75 +++
> > > hw/i386/ssdt-mem.hex.generated | 197 ++++++++
> > > hw/i386/ssdt-misc.dsl | 179 ++++++++
> > > hw/i386/ssdt-misc.hex.generated | 881
> > > +++++++++++++++++++++++++++++++++++-
> > > hw/mem/Makefile.objs | 1 +
> > > hw/mem/dimm.c | 321 +++++++++++++
> > > hw/pci-host/piix.c | 36 +-
> > > hw/pci-host/q35.c | 19 +-
> > > hw/pci/pci.c | 12 +-
> > > hw/pci/pcie.c | 7 +-
> > > hw/pci/shpc.c | 9 +-
> > > include/hw/acpi/acpi.h | 42 ++
> > > include/hw/acpi/ich9.h | 6 +
> > > include/hw/acpi/pcihp.h | 2 +-
> > > include/hw/acpi/piix4.h | 2 +
> > > include/hw/i386/pc.h | 33 ++-
> > > include/hw/mem/dimm.h | 99 ++++
> > > include/hw/pci-host/piix.h | 29 ++
> > > include/hw/pci-host/q35.h | 1 +
> > > include/hw/pci/pci.h | 11 +-
> > > include/hw/pci/pci_bus.h | 2 +-
> > > include/hw/qdev-core.h | 9 +
> > > include/sysemu/hostmem.h | 102 +++++
> > > include/sysemu/sysemu.h | 3 +
> > > monitor.c | 1 +
> > > qapi-schema.json | 18 +
> > > qapi/string-input-visitor.c | 18 +
> > > qemu-options.hx | 16 +-
> > > qmp-commands.hx | 27 ++
> > > ui/console.c | 3 +-
> > > vl.c | 98 ++++-
> > > 50 files changed, 3040 insertions(+), 140 deletions(-)
> > > create mode 100644 backends/hostmem.c
> > > create mode 100644 backends/hostmem_compat_ram.c
> > > create mode 100644 docs/specs/acpi_mem_hotplug.txt
> > > 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/mem/dimm.h
> > > create mode 100644 include/hw/pci-host/piix.h
> > > create mode 100644 include/sysemu/hostmem.h
- [Qemu-devel] [PATCH 24/27] pc: ACPI BIOS: add ssdt-mem.hex.generated and update ssdt-misc.hex.generated, (continued)
- [Qemu-devel] [PATCH 24/27] pc: ACPI BIOS: add ssdt-mem.hex.generated and update ssdt-misc.hex.generated, Igor Mammedov, 2013/11/20
- [Qemu-devel] [PATCH 25/27] pc: ACPI BIOS: use enum for defining memory affinity flags, Igor Mammedov, 2013/11/20
- [Qemu-devel] [PATCH 26/27] pc: ACPI BIOS: reserve SRAT entry for hotplug mem hole, Igor Mammedov, 2013/11/20
- [Qemu-devel] [PATCH 27/27] pc: ACPI BIOS: make GPE.3 handle memory hotplug event on PIIX and Q35 machines, Igor Mammedov, 2013/11/20
- Re: [Qemu-devel] [PATCH 00/27 RFC v7] ACPI memory hotplug, Michael S. Tsirkin, 2013/11/21