207 lines
7.3 KiB
ReStructuredText
207 lines
7.3 KiB
ReStructuredText
PowerNV family boards (``powernv8``, ``powernv9``, ``powernv10``)
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==================================================================
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PowerNV (as Non-Virtualized) is the "bare metal" platform using the
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OPAL firmware. It runs Linux on IBM and OpenPOWER systems and it can
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be used as an hypervisor OS, running KVM guests, or simply as a host
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OS.
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The PowerNV QEMU machine tries to emulate a PowerNV system at the
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level of the skiboot firmware, which loads the OS and provides some
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runtime services. Power Systems have a lower firmware (HostBoot) that
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does low level system initialization, like DRAM training. This is
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beyond the scope of what QEMU addresses today.
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Supported devices
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-----------------
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* Multi processor support for POWER8, POWER8NVL and POWER9.
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* XSCOM, serial communication sideband bus to configure chiplets.
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* Simple LPC Controller.
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* Processor Service Interface (PSI) Controller.
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* Interrupt Controller, XICS (POWER8) and XIVE (POWER9) and XIVE2 (Power10).
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* POWER8 PHB3 PCIe Host bridge and POWER9 PHB4 PCIe Host bridge.
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* Simple OCC is an on-chip micro-controller used for power management tasks.
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* iBT device to handle BMC communication, with the internal BMC simulator
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provided by QEMU or an external BMC such as an Aspeed QEMU machine.
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* PNOR containing the different firmware partitions.
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Missing devices
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---------------
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A lot is missing, among which :
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* I2C controllers (yet to be merged).
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* NPU/NPU2/NPU3 controllers.
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* EEH support for PCIe Host bridge controllers.
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* NX controller.
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* VAS controller.
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* chipTOD (Time Of Day).
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* Self Boot Engine (SBE).
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* FSI bus.
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Firmware
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--------
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The OPAL firmware (OpenPower Abstraction Layer) for OpenPower systems
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includes the runtime services ``skiboot`` and the bootloader kernel and
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initramfs ``skiroot``. Source code can be found on the `OpenPOWER account at
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GitHub <https://github.com/open-power>`_.
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Prebuilt images of ``skiboot`` and ``skiroot`` are made available on the
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`OpenPOWER <https://github.com/open-power/op-build/releases/>`__ site.
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QEMU includes a prebuilt image of ``skiboot`` which is updated when a
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more recent version is required by the models.
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Current acceleration status
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---------------------------
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KVM acceleration in Linux Power hosts is provided by the kvm-hv and
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kvm-pr modules. kvm-hv is adherent to PAPR and it's not compliant with
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powernv. kvm-pr in theory could be used as a valid accel option but
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this isn't supported by kvm-pr at this moment.
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To spare users from dealing with not so informative errors when attempting
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to use accel=kvm, the powernv machine will throw an error informing that
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KVM is not supported. This can be revisited in the future if kvm-pr (or
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any other KVM alternative) is usable as KVM accel for this machine.
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Boot options
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------------
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Here is a simple setup with one e1000e NIC :
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.. code-block:: bash
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$ qemu-system-ppc64 -m 2G -machine powernv9 -smp 2,cores=2,threads=1 \
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-accel tcg,thread=single \
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-device e1000e,netdev=net0,mac=C0:FF:EE:00:00:02,bus=pcie.0,addr=0x0 \
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-netdev user,id=net0,hostfwd=::20022-:22,hostname=pnv \
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-kernel ./zImage.epapr \
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-initrd ./rootfs.cpio.xz \
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-nographic
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and a SATA disk :
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.. code-block:: bash
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-device ich9-ahci,id=sata0,bus=pcie.1,addr=0x0 \
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-drive file=./ubuntu-ppc64le.qcow2,if=none,id=drive0,format=qcow2,cache=none \
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-device ide-hd,bus=sata0.0,unit=0,drive=drive0,id=ide,bootindex=1 \
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Complex PCIe configuration
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~~~~~~~~~~~~~~~~~~~~~~~~~~
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Six PHBs are defined per chip (POWER9) but no default PCI layout is
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provided (to be compatible with libvirt). One PCI device can be added
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on any of the available PCIe slots using command line options such as:
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.. code-block:: bash
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-device e1000e,netdev=net0,mac=C0:FF:EE:00:00:02,bus=pcie.0,addr=0x0
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-netdev bridge,id=net0,helper=/usr/libexec/qemu-bridge-helper,br=virbr0,id=hostnet0
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-device megasas,id=scsi0,bus=pcie.0,addr=0x0
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-drive file=./ubuntu-ppc64le.qcow2,if=none,id=drive-scsi0-0-0-0,format=qcow2,cache=none
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-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2
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Here is a full example with two different storage controllers on
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different PHBs, each with a disk, the second PHB is empty :
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.. code-block:: bash
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$ qemu-system-ppc64 -m 2G -machine powernv9 -smp 2,cores=2,threads=1 -accel tcg,thread=single \
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-kernel ./zImage.epapr -initrd ./rootfs.cpio.xz -bios ./skiboot.lid \
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\
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-device megasas,id=scsi0,bus=pcie.0,addr=0x0 \
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-drive file=./rhel7-ppc64le.qcow2,if=none,id=drive-scsi0-0-0-0,format=qcow2,cache=none \
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-device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2 \
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\
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-device pcie-pci-bridge,id=bridge1,bus=pcie.1,addr=0x0 \
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\
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-device ich9-ahci,id=sata0,bus=bridge1,addr=0x1 \
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-drive file=./ubuntu-ppc64le.qcow2,if=none,id=drive0,format=qcow2,cache=none \
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-device ide-hd,bus=sata0.0,unit=0,drive=drive0,id=ide,bootindex=1 \
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-device e1000e,netdev=net0,mac=C0:FF:EE:00:00:02,bus=bridge1,addr=0x2 \
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-netdev bridge,helper=/usr/libexec/qemu-bridge-helper,br=virbr0,id=net0 \
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-device nec-usb-xhci,bus=bridge1,addr=0x7 \
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\
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-serial mon:stdio -nographic
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You can also use VIRTIO devices :
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.. code-block:: bash
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-drive file=./fedora-ppc64le.qcow2,if=none,snapshot=on,id=drive0 \
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-device virtio-blk-pci,drive=drive0,id=blk0,bus=pcie.0 \
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\
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-netdev tap,helper=/usr/lib/qemu/qemu-bridge-helper,br=virbr0,id=netdev0 \
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-device virtio-net-pci,netdev=netdev0,id=net0,bus=pcie.1 \
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\
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-fsdev local,id=fsdev0,path=$HOME,security_model=passthrough \
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-device virtio-9p-pci,fsdev=fsdev0,mount_tag=host,bus=pcie.2
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Multi sockets
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~~~~~~~~~~~~~
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The number of sockets is deduced from the number of CPUs and the
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number of cores. ``-smp 2,cores=1`` will define a machine with 2
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sockets of 1 core, whereas ``-smp 2,cores=2`` will define a machine
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with 1 socket of 2 cores. ``-smp 8,cores=2``, 4 sockets of 2 cores.
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BMC configuration
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~~~~~~~~~~~~~~~~~
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OpenPOWER systems negotiate the shutdown and reboot with their
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BMC. The QEMU PowerNV machine embeds an IPMI BMC simulator using the
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iBT interface and should offer the same power features.
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If you want to define your own BMC, use ``-nodefaults`` and specify
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one on the command line :
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.. code-block:: bash
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-device ipmi-bmc-sim,id=bmc0 -device isa-ipmi-bt,bmc=bmc0,irq=10
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The files `palmetto-SDR.bin <http://www.kaod.org/qemu/powernv/palmetto-SDR.bin>`__
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and `palmetto-FRU.bin <http://www.kaod.org/qemu/powernv/palmetto-FRU.bin>`__
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define a Sensor Data Record repository and a Field Replaceable Unit
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inventory for a Palmetto BMC. They can be used to extend the QEMU BMC
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simulator.
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.. code-block:: bash
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-device ipmi-bmc-sim,sdrfile=./palmetto-SDR.bin,fruareasize=256,frudatafile=./palmetto-FRU.bin,id=bmc0 \
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-device isa-ipmi-bt,bmc=bmc0,irq=10
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The PowerNV machine can also be run with an external IPMI BMC device
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connected to a remote QEMU machine acting as BMC, using these options
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:
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.. code-block:: bash
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-chardev socket,id=ipmi0,host=localhost,port=9002,reconnect=10 \
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-device ipmi-bmc-extern,id=bmc0,chardev=ipmi0 \
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-device isa-ipmi-bt,bmc=bmc0,irq=10 \
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-nodefaults
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NVRAM
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~~~~~
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Use a MTD drive to add a PNOR to the machine, and get a NVRAM :
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.. code-block:: bash
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-drive file=./witherspoon.pnor,format=raw,if=mtd
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CAVEATS
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-------
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* No support for multiple HW threads (SMT=1). Same as pseries.
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Maintainer contact information
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------------------------------
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Cédric Le Goater <clg@kaod.org>
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