621 lines
23 KiB
ReStructuredText
621 lines
23 KiB
ReStructuredText
Deprecated features
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===================
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In general features are intended to be supported indefinitely once
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introduced into QEMU. In the event that a feature needs to be removed,
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it will be listed in this section. The feature will remain functional
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for 2 releases prior to actual removal. Deprecated features may also
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generate warnings on the console when QEMU starts up, or if activated
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via a monitor command, however, this is not a mandatory requirement.
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Prior to the 2.10.0 release there was no official policy on how
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long features would be deprecated prior to their removal, nor
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any documented list of which features were deprecated. Thus
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any features deprecated prior to 2.10.0 will be treated as if
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they were first deprecated in the 2.10.0 release.
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What follows is a list of all features currently marked as
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deprecated.
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System emulator command line arguments
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--------------------------------------
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``-machine enforce-config-section=on|off`` (since 3.1)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``enforce-config-section`` parameter is replaced by the
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``-global migration.send-configuration={on|off}`` option.
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``-no-kvm`` (since 1.3.0)
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'''''''''''''''''''''''''
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The ``-no-kvm`` argument is now a synonym for setting ``-accel tcg``.
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``-usbdevice`` (since 2.10.0)
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'''''''''''''''''''''''''''''
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The ``-usbdevice DEV`` argument is now a synonym for setting
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the ``-device usb-DEV`` argument instead. The deprecated syntax
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would automatically enable USB support on the machine type.
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If using the new syntax, USB support must be explicitly
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enabled via the ``-machine usb=on`` argument.
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``-drive file=json:{...{'driver':'file'}}`` (since 3.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The 'file' driver for drives is no longer appropriate for character or host
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devices and will only accept regular files (S_IFREG). The correct driver
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for these file types is 'host_cdrom' or 'host_device' as appropriate.
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``-smp`` (invalid topologies) (since 3.1)
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'''''''''''''''''''''''''''''''''''''''''
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CPU topology properties should describe whole machine topology including
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possible CPUs.
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However, historically it was possible to start QEMU with an incorrect topology
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where *n* <= *sockets* * *cores* * *threads* < *maxcpus*,
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which could lead to an incorrect topology enumeration by the guest.
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Support for invalid topologies will be removed, the user must ensure
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topologies described with -smp include all possible cpus, i.e.
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*sockets* * *cores* * *threads* = *maxcpus*.
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``-vnc acl`` (since 4.0.0)
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''''''''''''''''''''''''''
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The ``acl`` option to the ``-vnc`` argument has been replaced
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by the ``tls-authz`` and ``sasl-authz`` options.
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``QEMU_AUDIO_`` environment variables and ``-audio-help`` (since 4.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``-audiodev`` argument is now the preferred way to specify audio
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backend settings instead of environment variables. To ease migration to
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the new format, the ``-audiodev-help`` option can be used to convert
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the current values of the environment variables to ``-audiodev`` options.
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Creating sound card devices and vnc without ``audiodev=`` property (since 4.2)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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When not using the deprecated legacy audio config, each sound card
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should specify an ``audiodev=`` property. Additionally, when using
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vnc, you should specify an ``audiodev=`` propery if you plan to
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transmit audio through the VNC protocol.
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Creating sound card devices using ``-soundhw`` (since 5.1)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Sound card devices should be created using ``-device`` instead. The
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names are the same for most devices. The exceptions are ``hda`` which
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needs two devices (``-device intel-hda -device hda-duplex``) and
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``pcspk`` which can be activated using ``-machine
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pcspk-audiodev=<name>``.
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``-mon ...,control=readline,pretty=on|off`` (since 4.1)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``pretty=on|off`` switch has no effect for HMP monitors, but is
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silently ignored. Using the switch with HMP monitors will become an
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error in the future.
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``-realtime`` (since 4.1)
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'''''''''''''''''''''''''
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The ``-realtime mlock=on|off`` argument has been replaced by the
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``-overcommit mem-lock=on|off`` argument.
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``-numa`` node (without memory specified) (since 4.1)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''
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Splitting RAM by default between NUMA nodes has the same issues as ``mem``
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parameter described above with the difference that the role of the user plays
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QEMU using implicit generic or board specific splitting rule.
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Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if
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it's supported by used machine type) to define mapping explictly instead.
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``-mem-path`` fallback to RAM (since 4.1)
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'''''''''''''''''''''''''''''''''''''''''
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Currently if guest RAM allocation from file pointed by ``mem-path``
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fails, QEMU falls back to allocating from RAM, which might result
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in unpredictable behavior since the backing file specified by the user
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is ignored. In the future, users will be responsible for making sure
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the backing storage specified with ``-mem-path`` can actually provide
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the guest RAM configured with ``-m`` and QEMU will fail to start up if
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RAM allocation is unsuccessful.
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RISC-V ``-bios`` (since 5.1)
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''''''''''''''''''''''''''''
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QEMU 4.1 introduced support for the -bios option in QEMU for RISC-V for the
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RISC-V virt machine and sifive_u machine. QEMU 4.1 had no changes to the
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default behaviour to avoid breakages.
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QEMU 5.1 changes the default behaviour from ``-bios none`` to ``-bios default``.
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QEMU 5.1 has three options:
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1. ``-bios default`` - This is the current default behavior if no -bios option
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is included. This option will load the default OpenSBI firmware automatically.
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The firmware is included with the QEMU release and no user interaction is
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required. All a user needs to do is specify the kernel they want to boot
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with the -kernel option
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2. ``-bios none`` - QEMU will not automatically load any firmware. It is up
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to the user to load all the images they need.
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3. ``-bios <file>`` - Tells QEMU to load the specified file as the firmwrae.
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``-tb-size`` option (since 5.0)
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'''''''''''''''''''''''''''''''
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QEMU 5.0 introduced an alternative syntax to specify the size of the translation
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block cache, ``-accel tcg,tb-size=``. The new syntax deprecates the
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previously available ``-tb-size`` option.
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``-show-cursor`` option (since 5.0)
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'''''''''''''''''''''''''''''''''''
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Use ``-display sdl,show-cursor=on`` or
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``-display gtk,show-cursor=on`` instead.
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``Configuring floppies with ``-global``
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'''''''''''''''''''''''''''''''''''''''
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Use ``-device floppy,...`` instead:
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::
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-global isa-fdc.driveA=...
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-global sysbus-fdc.driveA=...
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-global SUNW,fdtwo.drive=...
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become
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::
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-device floppy,unit=0,drive=...
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and
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::
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-global isa-fdc.driveB=...
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-global sysbus-fdc.driveB=...
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become
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::
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-device floppy,unit=1,drive=...
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``-drive`` with bogus interface type
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''''''''''''''''''''''''''''''''''''
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Drives with interface types other than ``if=none`` are for onboard
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devices. It is possible to use drives the board doesn't pick up with
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-device. This usage is now deprecated. Use ``if=none`` instead.
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QEMU Machine Protocol (QMP) commands
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------------------------------------
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``change`` (since 2.5.0)
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''''''''''''''''''''''''
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Use ``blockdev-change-medium`` or ``change-vnc-password`` instead.
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``blockdev-open-tray``, ``blockdev-close-tray`` argument ``device`` (since 2.8.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use argument ``id`` instead.
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``eject`` argument ``device`` (since 2.8.0)
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'''''''''''''''''''''''''''''''''''''''''''
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Use argument ``id`` instead.
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``blockdev-change-medium`` argument ``device`` (since 2.8.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use argument ``id`` instead.
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``block_set_io_throttle`` argument ``device`` (since 2.8.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use argument ``id`` instead.
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``migrate_set_downtime`` and ``migrate_set_speed`` (since 2.8.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``migrate-set-parameters`` instead.
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``query-named-block-nodes`` result ``encryption_key_missing`` (since 2.10.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Always false.
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``query-block`` result ``inserted.encryption_key_missing`` (since 2.10.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Always false.
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``blockdev-add`` empty string argument ``backing`` (since 2.10.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use argument value ``null`` instead.
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``migrate-set-cache-size`` and ``query-migrate-cache-size`` (since 2.11.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``migrate-set-parameters`` and ``query-migrate-parameters`` instead.
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``block-commit`` arguments ``base`` and ``top`` (since 3.1.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use arguments ``base-node`` and ``top-node`` instead.
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``object-add`` option ``props`` (since 5.0)
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'''''''''''''''''''''''''''''''''''''''''''
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Specify the properties for the object as top-level arguments instead.
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``query-named-block-nodes`` and ``query-block`` result dirty-bitmaps[i].status (since 4.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``status`` field of the ``BlockDirtyInfo`` structure, returned by
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these commands is deprecated. Two new boolean fields, ``recording`` and
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``busy`` effectively replace it.
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``query-block`` result field ``dirty-bitmaps`` (Since 4.2)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``dirty-bitmaps`` field of the ``BlockInfo`` structure, returned by
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the query-block command is itself now deprecated. The ``dirty-bitmaps``
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field of the ``BlockDeviceInfo`` struct should be used instead, which is the
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type of the ``inserted`` field in query-block replies, as well as the
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type of array items in query-named-block-nodes.
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Since the ``dirty-bitmaps`` field is optionally present in both the old and
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new locations, clients must use introspection to learn where to anticipate
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the field if/when it does appear in command output.
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``query-cpus`` (since 2.12.0)
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'''''''''''''''''''''''''''''
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The ``query-cpus`` command is replaced by the ``query-cpus-fast`` command.
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``query-cpus-fast`` ``arch`` output member (since 3.0.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``arch`` output member of the ``query-cpus-fast`` command is
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replaced by the ``target`` output member.
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``cpu-add`` (since 4.0)
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'''''''''''''''''''''''
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Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``. See
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documentation of ``query-hotpluggable-cpus`` for additional
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details.
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``query-events`` (since 4.0)
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''''''''''''''''''''''''''''
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The ``query-events`` command has been superseded by the more powerful
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and accurate ``query-qmp-schema`` command.
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chardev client socket with ``wait`` option (since 4.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Character devices creating sockets in client mode should not specify
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the 'wait' field, which is only applicable to sockets in server mode
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Human Monitor Protocol (HMP) commands
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-------------------------------------
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``cpu-add`` (since 4.0)
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'''''''''''''''''''''''
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Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``. See
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documentation of ``query-hotpluggable-cpus`` for additional details.
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``acl_show``, ``acl_reset``, ``acl_policy``, ``acl_add``, ``acl_remove`` (since 4.0.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``acl_show``, ``acl_reset``, ``acl_policy``, ``acl_add``, and
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``acl_remove`` commands are deprecated with no replacement. Authorization
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for VNC should be performed using the pluggable QAuthZ objects.
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System emulator CPUS
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--------------------
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``compat`` property of server class POWER CPUs (since 5.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``compat`` property used to set backwards compatibility modes for
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the processor has been deprecated. The ``max-cpu-compat`` property of
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the ``pseries`` machine type should be used instead.
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KVM guest support on 32-bit Arm hosts (since 5.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''
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The Linux kernel has dropped support for allowing 32-bit Arm systems
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to host KVM guests as of the 5.7 kernel. Accordingly, QEMU is deprecating
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its support for this configuration and will remove it in a future version.
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Running 32-bit guests on a 64-bit Arm host remains supported.
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System emulator devices
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-----------------------
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``ide-drive`` (since 4.2)
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'''''''''''''''''''''''''
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The 'ide-drive' device is deprecated. Users should use 'ide-hd' or
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'ide-cd' as appropriate to get an IDE hard disk or CD-ROM as needed.
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``scsi-disk`` (since 4.2)
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'''''''''''''''''''''''''
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The 'scsi-disk' device is deprecated. Users should use 'scsi-hd' or
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'scsi-cd' as appropriate to get a SCSI hard disk or CD-ROM as needed.
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System emulator machines
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------------------------
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mips ``r4k`` platform (since 5.0)
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'''''''''''''''''''''''''''''''''
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This machine type is very old and unmaintained. Users should use the ``malta``
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machine type instead.
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mips ``fulong2e`` machine (since 5.1)
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'''''''''''''''''''''''''''''''''''''
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This machine has been renamed ``fuloong2e``.
|
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``pc-1.0``, ``pc-1.1``, ``pc-1.2`` and ``pc-1.3`` (since 5.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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These machine types are very old and likely can not be used for live migration
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from old QEMU versions anymore. A newer machine type should be used instead.
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Device options
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--------------
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Emulated device options
|
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'''''''''''''''''''''''
|
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``-device virtio-blk,scsi=on|off`` (since 5.0.0)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
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The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature. VIRTIO 1.0
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and later do not support it because the virtio-scsi device was introduced for
|
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full SCSI support. Use virtio-scsi instead when SCSI passthrough is required.
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Note this also applies to ``-device virtio-blk-pci,scsi=on|off``, which is an
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alias.
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Block device options
|
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''''''''''''''''''''
|
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``"backing": ""`` (since 2.12.0)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
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In order to prevent QEMU from automatically opening an image's backing
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chain, use ``"backing": null`` instead.
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``rbd`` keyvalue pair encoded filenames: ``""`` (since 3.1.0)
|
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
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|
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Options for ``rbd`` should be specified according to its runtime options,
|
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like other block drivers. Legacy parsing of keyvalue pair encoded
|
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filenames is useful to open images with the old format for backing files;
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These image files should be updated to use the current format.
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Example of legacy encoding::
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json:{"file.driver":"rbd", "file.filename":"rbd:rbd/name"}
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The above, converted to the current supported format::
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json:{"file.driver":"rbd", "file.pool":"rbd", "file.image":"name"}
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linux-user mode CPUs
|
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--------------------
|
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``tilegx`` CPUs (since 5.1.0)
|
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'''''''''''''''''''''''''''''
|
|
|
|
The ``tilegx`` guest CPU support (which was only implemented in
|
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linux-user mode) is deprecated and will be removed in a future version
|
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of QEMU. Support for this CPU was removed from the upstream Linux
|
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kernel in 2018, and has also been dropped from glibc.
|
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|
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Related binaries
|
|
----------------
|
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|
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qemu-img amend to adjust backing file (since 5.1)
|
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'''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
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The use of ``qemu-img amend`` to modify the name or format of a qcow2
|
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backing image is deprecated; this functionality was never fully
|
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documented or tested, and interferes with other amend operations that
|
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need access to the original backing image (such as deciding whether a
|
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v3 zero cluster may be left unallocated when converting to a v2
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image). Rather, any changes to the backing chain should be performed
|
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with ``qemu-img rebase -u`` either before or after the remaining
|
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changes being performed by amend, as appropriate.
|
|
|
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qemu-img backing file without format (since 5.1)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The use of ``qemu-img create``, ``qemu-img rebase``, or ``qemu-img
|
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convert`` to create or modify an image that depends on a backing file
|
|
now recommends that an explicit backing format be provided. This is
|
|
for safety: if QEMU probes a different format than what you thought,
|
|
the data presented to the guest will be corrupt; similarly, presenting
|
|
a raw image to a guest allows a potential security exploit if a future
|
|
probe sees a non-raw image based on guest writes.
|
|
|
|
To avoid the warning message, or even future refusal to create an
|
|
unsafe image, you must pass ``-o backing_fmt=`` (or the shorthand
|
|
``-F`` during create) to specify the intended backing format. You may
|
|
use ``qemu-img rebase -u`` to retroactively add a backing format to an
|
|
existing image. However, be aware that there are already potential
|
|
security risks to blindly using ``qemu-img info`` to probe the format
|
|
of an untrusted backing image, when deciding what format to add into
|
|
an existing image.
|
|
|
|
Backwards compatibility
|
|
-----------------------
|
|
|
|
Runnability guarantee of CPU models (since 4.1.0)
|
|
'''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
Previous versions of QEMU never changed existing CPU models in
|
|
ways that introduced additional host software or hardware
|
|
requirements to the VM. This allowed management software to
|
|
safely change the machine type of an existing VM without
|
|
introducing new requirements ("runnability guarantee"). This
|
|
prevented CPU models from being updated to include CPU
|
|
vulnerability mitigations, leaving guests vulnerable in the
|
|
default configuration.
|
|
|
|
The CPU model runnability guarantee won't apply anymore to
|
|
existing CPU models. Management software that needs runnability
|
|
guarantees must resolve the CPU model aliases using te
|
|
``alias-of`` field returned by the ``query-cpu-definitions`` QMP
|
|
command.
|
|
|
|
While those guarantees are kept, the return value of
|
|
``query-cpu-definitions`` will have existing CPU model aliases
|
|
point to a version that doesn't break runnability guarantees
|
|
(specifically, version 1 of those CPU models). In future QEMU
|
|
versions, aliases will point to newer CPU model versions
|
|
depending on the machine type, so management software must
|
|
resolve CPU model aliases before starting a virtual machine.
|
|
|
|
|
|
Recently removed features
|
|
=========================
|
|
|
|
What follows is a record of recently removed, formerly deprecated
|
|
features that serves as a record for users who have encountered
|
|
trouble after a recent upgrade.
|
|
|
|
System emulator command line arguments
|
|
--------------------------------------
|
|
|
|
``-net ...,name=``\ *name* (removed in 5.1)
|
|
'''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The ``name`` parameter of the ``-net`` option was a synonym
|
|
for the ``id`` parameter, which should now be used instead.
|
|
|
|
QEMU Machine Protocol (QMP) commands
|
|
------------------------------------
|
|
|
|
``block-dirty-bitmap-add`` "autoload" parameter (since 4.2.0)
|
|
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The "autoload" parameter has been ignored since 2.12.0. All bitmaps
|
|
are automatically loaded from qcow2 images.
|
|
|
|
Human Monitor Protocol (HMP) commands
|
|
-------------------------------------
|
|
|
|
The ``hub_id`` parameter of ``hostfwd_add`` / ``hostfwd_remove`` (removed in 5.0)
|
|
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The ``[hub_id name]`` parameter tuple of the 'hostfwd_add' and
|
|
'hostfwd_remove' HMP commands has been replaced by ``netdev_id``.
|
|
|
|
Guest Emulator ISAs
|
|
-------------------
|
|
|
|
RISC-V ISA privledge specification version 1.09.1 (removed in 5.1)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The RISC-V ISA privledge specification version 1.09.1 has been removed.
|
|
QEMU supports both the newer version 1.10.0 and the ratified version 1.11.0, these
|
|
should be used instead of the 1.09.1 version.
|
|
|
|
System emulator CPUS
|
|
--------------------
|
|
|
|
RISC-V ISA Specific CPUs (removed in 5.1)
|
|
'''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The RISC-V cpus with the ISA version in the CPU name have been removed. The
|
|
four CPUs are: ``rv32gcsu-v1.9.1``, ``rv32gcsu-v1.10.0``, ``rv64gcsu-v1.9.1`` and
|
|
``rv64gcsu-v1.10.0``. Instead the version can be specified via the CPU ``priv_spec``
|
|
option when using the ``rv32`` or ``rv64`` CPUs.
|
|
|
|
RISC-V no MMU CPUs (removed in 5.1)
|
|
'''''''''''''''''''''''''''''''''''
|
|
|
|
The RISC-V no MMU cpus have been removed. The two CPUs: ``rv32imacu-nommu`` and
|
|
``rv64imacu-nommu`` can no longer be used. Instead the MMU status can be specified
|
|
via the CPU ``mmu`` option when using the ``rv32`` or ``rv64`` CPUs.
|
|
|
|
System emulator machines
|
|
------------------------
|
|
|
|
``spike_v1.9.1`` and ``spike_v1.10`` (removed in 5.1)
|
|
'''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The version specific Spike machines have been removed in favour of the
|
|
generic ``spike`` machine. If you need to specify an older version of the RISC-V
|
|
spec you can use the ``-cpu rv64gcsu,priv_spec=v1.10.0`` command line argument.
|
|
|
|
Related binaries
|
|
----------------
|
|
|
|
``qemu-nbd --partition`` (removed in 5.0)
|
|
'''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The ``qemu-nbd --partition $digit`` code (also spelled ``-P``)
|
|
could only handle MBR partitions, and never correctly handled logical
|
|
partitions beyond partition 5. Exporting a partition can still be
|
|
done by utilizing the ``--image-opts`` option with a raw blockdev
|
|
using the ``offset`` and ``size`` parameters layered on top of
|
|
any other existing blockdev. For example, if partition 1 is 100MiB
|
|
long starting at 1MiB, the old command::
|
|
|
|
qemu-nbd -t -P 1 -f qcow2 file.qcow2
|
|
|
|
can be rewritten as::
|
|
|
|
qemu-nbd -t --image-opts driver=raw,offset=1M,size=100M,file.driver=qcow2,file.file.driver=file,file.file.filename=file.qcow2
|
|
|
|
``qemu-img convert -n -o`` (removed in 5.1)
|
|
'''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
All options specified in ``-o`` are image creation options, so
|
|
they are now rejected when used with ``-n`` to skip image creation.
|
|
|
|
|
|
``qemu-img create -b bad file $size`` (removed in 5.1)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
When creating an image with a backing file that could not be opened,
|
|
``qemu-img create`` used to issue a warning about the failure but
|
|
proceed with the image creation if an explicit size was provided.
|
|
However, as the ``-u`` option exists for this purpose, it is safer to
|
|
enforce that any failure to open the backing image (including if the
|
|
backing file is missing or an incorrect format was specified) is an
|
|
error when ``-u`` is not used.
|
|
|
|
Command line options
|
|
--------------------
|
|
|
|
``-numa node,mem=``\ *size* (removed in 5.1)
|
|
''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The parameter ``mem`` of ``-numa node`` was used to assign a part of
|
|
guest RAM to a NUMA node. But when using it, it's impossible to manage a specified
|
|
RAM chunk on the host side (like bind it to a host node, setting bind policy, ...),
|
|
so the guest ends up with the fake NUMA configuration with suboptiomal performance.
|
|
However since 2014 there is an alternative way to assign RAM to a NUMA node
|
|
using parameter ``memdev``, which does the same as ``mem`` and adds
|
|
means to actually manage node RAM on the host side. Use parameter ``memdev``
|
|
with *memory-backend-ram* backend as replacement for parameter ``mem``
|
|
to achieve the same fake NUMA effect or a properly configured
|
|
*memory-backend-file* backend to actually benefit from NUMA configuration.
|
|
New machine versions (since 5.1) will not accept the option but it will still
|
|
work with old machine types. User can check the QAPI schema to see if the legacy
|
|
option is supported by looking at MachineInfo::numa-mem-supported property.
|