0afec75734
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210120144235.345983-3-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
260 lines
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ReStructuredText
260 lines
10 KiB
ReStructuredText
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Removed features
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================
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What follows is a record of recently removed, formerly deprecated
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features that serves as a record for users who have encountered
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trouble after a recent upgrade.
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System emulator command line arguments
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--------------------------------------
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``-net ...,name=``\ *name* (removed in 5.1)
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'''''''''''''''''''''''''''''''''''''''''''
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The ``name`` parameter of the ``-net`` option was a synonym
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for the ``id`` parameter, which should now be used instead.
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``-no-kvm`` (removed in 5.2)
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''''''''''''''''''''''''''''
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The ``-no-kvm`` argument was a synonym for setting ``-machine accel=tcg``.
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``-realtime`` (removed in 6.0)
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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The ``-realtime mlock=on|off`` argument has been replaced by the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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``-show-cursor`` option (since 5.0)
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'''''''''''''''''''''''''''''''''''
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Use ``-display sdl,show-cursor=on``, ``-display gtk,show-cursor=on``
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or ``-display default,show-cursor=on`` instead.
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``-tb-size`` option (removed in 6.0)
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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=``.
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QEMU Machine Protocol (QMP) commands
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------------------------------------
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``block-dirty-bitmap-add`` "autoload" parameter (removed in 4.2.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The "autoload" parameter has been ignored since 2.12.0. All bitmaps
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are automatically loaded from qcow2 images.
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``cpu-add`` (removed in 5.2)
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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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``change`` (removed in 6.0)
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'''''''''''''''''''''''''''
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Use ``blockdev-change-medium`` or ``change-vnc-password`` instead.
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Human Monitor Protocol (HMP) commands
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-------------------------------------
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The ``hub_id`` parameter of ``hostfwd_add`` / ``hostfwd_remove`` (removed in 5.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``[hub_id name]`` parameter tuple of the 'hostfwd_add' and
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'hostfwd_remove' HMP commands has been replaced by ``netdev_id``.
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``cpu-add`` (removed in 5.2)
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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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``change vnc TARGET`` (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''
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No replacement. The ``change vnc password`` and ``change DEVICE MEDIUM``
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commands are not affected.
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Guest Emulator ISAs
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-------------------
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RISC-V ISA privilege specification version 1.09.1 (removed in 5.1)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The RISC-V ISA privilege specification version 1.09.1 has been removed.
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QEMU supports both the newer version 1.10.0 and the ratified version 1.11.0, these
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should be used instead of the 1.09.1 version.
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System emulator CPUS
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--------------------
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KVM guest support on 32-bit Arm hosts (removed in 5.2)
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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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RISC-V ISA Specific CPUs (removed in 5.1)
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'''''''''''''''''''''''''''''''''''''''''
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The RISC-V cpus with the ISA version in the CPU name have been removed. The
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four CPUs are: ``rv32gcsu-v1.9.1``, ``rv32gcsu-v1.10.0``, ``rv64gcsu-v1.9.1`` and
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``rv64gcsu-v1.10.0``. Instead the version can be specified via the CPU ``priv_spec``
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option when using the ``rv32`` or ``rv64`` CPUs.
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RISC-V no MMU CPUs (removed in 5.1)
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'''''''''''''''''''''''''''''''''''
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The RISC-V no MMU cpus have been removed. The two CPUs: ``rv32imacu-nommu`` and
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``rv64imacu-nommu`` can no longer be used. Instead the MMU status can be specified
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via the CPU ``mmu`` option when using the ``rv32`` or ``rv64`` CPUs.
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System emulator machines
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------------------------
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``spike_v1.9.1`` and ``spike_v1.10`` (removed in 5.1)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''
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The version specific Spike machines have been removed in favour of the
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generic ``spike`` machine. If you need to specify an older version of the RISC-V
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spec you can use the ``-cpu rv64gcsu,priv_spec=v1.10.0`` command line argument.
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mips ``r4k`` platform (removed in 5.2)
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''''''''''''''''''''''''''''''''''''''
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This machine type was very old and unmaintained. Users should use the ``malta``
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machine type instead.
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mips ``fulong2e`` machine alias (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''''''''''''
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This machine has been renamed ``fuloong2e``.
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Related binaries
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----------------
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``qemu-nbd --partition`` (removed in 5.0)
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'''''''''''''''''''''''''''''''''''''''''
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The ``qemu-nbd --partition $digit`` code (also spelled ``-P``)
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could only handle MBR partitions, and never correctly handled logical
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partitions beyond partition 5. Exporting a partition can still be
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done by utilizing the ``--image-opts`` option with a raw blockdev
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using the ``offset`` and ``size`` parameters layered on top of
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any other existing blockdev. For example, if partition 1 is 100MiB
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long starting at 1MiB, the old command::
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qemu-nbd -t -P 1 -f qcow2 file.qcow2
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can be rewritten as::
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qemu-nbd -t --image-opts driver=raw,offset=1M,size=100M,file.driver=qcow2,file.file.driver=file,file.file.filename=file.qcow2
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``qemu-img convert -n -o`` (removed in 5.1)
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'''''''''''''''''''''''''''''''''''''''''''
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All options specified in ``-o`` are image creation options, so
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they are now rejected when used with ``-n`` to skip image creation.
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``qemu-img create -b bad file $size`` (removed in 5.1)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''
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When creating an image with a backing file that could not be opened,
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``qemu-img create`` used to issue a warning about the failure but
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proceed with the image creation if an explicit size was provided.
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However, as the ``-u`` option exists for this purpose, it is safer to
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enforce that any failure to open the backing image (including if the
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backing file is missing or an incorrect format was specified) is an
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error when ``-u`` is not used.
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Command line options
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--------------------
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``-smp`` (invalid topologies) (removed 5.2)
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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 is 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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``-numa`` node (without memory specified) (removed 5.2)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Splitting RAM by default between NUMA nodes had the same issues as ``mem``
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parameter with the difference that the role of the user plays QEMU using
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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 explicitly instead.
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Users of existing VMs, wishing to preserve the same RAM distribution, should
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configure it explicitly using ``-numa node,memdev`` options. Current RAM
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distribution can be retrieved using HMP command ``info numa`` and if separate
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memory devices (pc|nv-dimm) are present use ``info memory-device`` and subtract
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device memory from output of ``info numa``.
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``-numa node,mem=``\ *size* (removed in 5.1)
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''''''''''''''''''''''''''''''''''''''''''''
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The parameter ``mem`` of ``-numa node`` was used to assign a part of
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guest RAM to a NUMA node. But when using it, it's impossible to manage a specified
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RAM chunk on the host side (like bind it to a host node, setting bind policy, ...),
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so the guest ends up with the fake NUMA configuration with suboptiomal performance.
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However since 2014 there is an alternative way to assign RAM to a NUMA node
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using parameter ``memdev``, which does the same as ``mem`` and adds
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means to actually manage node RAM on the host side. Use parameter ``memdev``
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with *memory-backend-ram* backend as replacement for parameter ``mem``
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to achieve the same fake NUMA effect or a properly configured
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*memory-backend-file* backend to actually benefit from NUMA configuration.
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New machine versions (since 5.1) will not accept the option but it will still
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work with old machine types. User can check the QAPI schema to see if the legacy
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option is supported by looking at MachineInfo::numa-mem-supported property.
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``-mem-path`` fallback to RAM (removed in 5.0)
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''''''''''''''''''''''''''''''''''''''''''''''
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If guest RAM allocation from file pointed by ``mem-path`` failed,
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QEMU was falling back to allocating from RAM, which might have resulted
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in unpredictable behavior since the backing file specified by the user
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as ignored. Currently, users are responsible for making sure the backing storage
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specified with ``-mem-path`` can actually provide the guest RAM configured with
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``-m`` and QEMU fails to start up if RAM allocation is unsuccessful.
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``-smp`` (invalid topologies) (removed 5.2)
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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 is 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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``-machine enforce-config-section=on|off`` (removed 5.2)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``enforce-config-section`` property was replaced by the
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``-global migration.send-configuration={on|off}`` option.
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Block devices
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-------------
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VXHS backend (removed in 5.1)
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'''''''''''''''''''''''''''''
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The VXHS code did not compile since v2.12.0. It was removed in 5.1.
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