QEMU 5.1 changed the behaviour of the default boot for the RISC-V virt and sifive_u machines. This patch moves that change from the deprecated.rst file to the removed-features.rst file and the target-riscv.rst. Signed-off-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Message-id: 4f1c261e7f69045ab8bb8926d85fe1d35e48ea5b.1620081256.git.alistair.francis@wdc.com
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ReStructuredText
508 lines
18 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The ``-realtime mlock=on|off`` argument has been replaced by the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 (removed in 6.0)
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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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``-usbdevice audio`` (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''
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This option lacked the possibility to specify an audio backend device.
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Use ``-device usb-audio`` now instead (and specify a corresponding USB
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host controller or ``-usb`` if necessary).
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``-vnc acl`` (removed in 6.0)
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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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``-mon ...,control=readline,pretty=on|off`` (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``pretty=on|off`` switch has no effect for HMP monitors and
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its use is rejected.
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``-drive file=json:{...{'driver':'file'}}`` (removed 6.0)
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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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Floppy controllers' drive properties (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``-device floppy,...`` instead. When configuring onboard floppy
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controllers
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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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When plugging in a floppy controller
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::
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-device isa-fdc,...,driveA=...
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becomes
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::
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-device isa-fdc,...
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-device floppy,unit=0,drive=...
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and
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::
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-device isa-fdc,...,driveB=...
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becomes
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::
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-device isa-fdc,...
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-device floppy,unit=1,drive=...
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``-drive`` with bogus interface type (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''
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Drives with interface types other than ``if=none`` are for onboard
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devices. Drives the board doesn't pick up can no longer be used with
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-device. Use ``if=none`` instead.
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``-usbdevice ccid`` (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''
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This option was undocumented and not used in the field.
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Use `-device usb-ccid`` instead.
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RISC-V firmware not booted by default (removed in 5.1)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''
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QEMU 5.1 changes the default behaviour from ``-bios none`` to ``-bios default``
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for the RISC-V ``virt`` machine and ``sifive_u`` machine.
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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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``query-events`` (removed in 6.0)
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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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``migrate_set_cache_size`` and ``query-migrate-cache-size`` (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``migrate_set_parameter`` and ``info migrate_parameters`` instead.
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``migrate_set_downtime`` and ``migrate_set_speed`` (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``migrate_set_parameter`` instead.
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``query-cpus`` (removed in 6.0)
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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 (removed in 6.0)
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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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chardev client socket with ``wait`` option (removed in 6.0)
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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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``query-named-block-nodes`` result ``encryption_key_missing`` (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Removed with no replacement.
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``query-block`` result ``inserted.encryption_key_missing`` (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Removed with no replacement.
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``query-named-block-nodes`` and ``query-block`` result dirty-bitmaps[i].status (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``status`` field of the ``BlockDirtyInfo`` structure, returned by
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these commands is removed. Two new boolean fields, ``recording`` and
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``busy`` effectively replace it.
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``query-block`` result field ``dirty-bitmaps`` (removed in 6.0)
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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 removed. 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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``object-add`` option ``props`` (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''''''''''''
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Specify the properties for the object as top-level arguments 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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``acl_show``, ``acl_reset``, ``acl_policy``, ``acl_add``, ``acl_remove`` (removed in 6.0)
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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 were removed with no replacement. Authorization
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for VNC should be performed using the pluggable QAuthZ objects.
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``migrate-set-cache-size`` and ``info migrate-cache-size`` (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``migrate-set-parameters`` and ``info migrate-parameters`` instead.
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``migrate_set_downtime`` and ``migrate_set_speed`` (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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Use ``migrate-set-parameters`` instead.
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``info cpustats`` (removed in 6.1)
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''''''''''''''''''''''''''''''''''
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This command didn't produce any output already. Removed with no replacement.
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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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``compat`` property of server class POWER CPUs (removed in 6.0)
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'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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The ``max-cpu-compat`` property of the ``pseries`` machine type should be used
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instead.
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``moxie`` CPU (removed in 6.1)
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''''''''''''''''''''''''''''''
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Nobody was using this CPU emulation in QEMU, and there were no test images
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available to make sure that the code is still working, so it has been removed
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without replacement.
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``lm32`` CPUs (removed in 6.1.0)
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''''''''''''''''''''''''''''''''
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The only public user of this architecture was the milkymist project,
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which has been dead for years; there was never an upstream Linux
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port. Removed without replacement.
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``unicore32`` CPUs (since 6.1.0)
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''''''''''''''''''''''''''''''''
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Support for this CPU was removed from the upstream Linux kernel, and
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there is no available upstream toolchain to build binaries for it.
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Removed without replacement.
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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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``pc-1.0``, ``pc-1.1``, ``pc-1.2`` and ``pc-1.3`` (removed in 6.0)
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''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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These machine types were very old and likely could not be used for live
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migration from old QEMU versions anymore. Use a newer machine type instead.
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linux-user mode CPUs
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--------------------
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``tilegx`` CPUs (removed in 6.0)
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''''''''''''''''''''''''''''''''
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The ``tilegx`` guest CPU support has been removed without replacement. It was
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only implemented in linux-user mode, but support for this CPU was removed from
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the upstream Linux kernel in 2018, and it has also been dropped from glibc, so
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there is no new Linux development taking place with this architecture. For
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running the old binaries, you can use older versions of QEMU.
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System emulator devices
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-----------------------
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``ide-drive`` (removed in 6.0)
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''''''''''''''''''''''''''''''
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The 'ide-drive' device has been removed. 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`` (removed in 6.0)
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''''''''''''''''''''''''''''''
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The 'scsi-disk' device has been removed. 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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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``
|
|
parameter with the difference that the role of the user plays QEMU using
|
|
implicit generic or board specific splitting rule.
|
|
Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if
|
|
it's supported by used machine type) to define mapping explicitly instead.
|
|
Users of existing VMs, wishing to preserve the same RAM distribution, should
|
|
configure it explicitly using ``-numa node,memdev`` options. Current RAM
|
|
distribution can be retrieved using HMP command ``info numa`` and if separate
|
|
memory devices (pc|nv-dimm) are present use ``info memory-device`` and subtract
|
|
device memory from output of ``info numa``.
|
|
|
|
``-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.
|
|
|
|
``-mem-path`` fallback to RAM (removed in 5.0)
|
|
''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
If guest RAM allocation from file pointed by ``mem-path`` failed,
|
|
QEMU was falling back to allocating from RAM, which might have resulted
|
|
in unpredictable behavior since the backing file specified by the user
|
|
as ignored. Currently, users are responsible for making sure the backing storage
|
|
specified with ``-mem-path`` can actually provide the guest RAM configured with
|
|
``-m`` and QEMU fails to start up if RAM allocation is unsuccessful.
|
|
|
|
``-smp`` (invalid topologies) (removed 5.2)
|
|
'''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
CPU topology properties should describe whole machine topology including
|
|
possible CPUs.
|
|
|
|
However, historically it was possible to start QEMU with an incorrect topology
|
|
where *n* <= *sockets* * *cores* * *threads* < *maxcpus*,
|
|
which could lead to an incorrect topology enumeration by the guest.
|
|
Support for invalid topologies is removed, the user must ensure
|
|
topologies described with -smp include all possible cpus, i.e.
|
|
*sockets* * *cores* * *threads* = *maxcpus*.
|
|
|
|
``-machine enforce-config-section=on|off`` (removed 5.2)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The ``enforce-config-section`` property was replaced by the
|
|
``-global migration.send-configuration={on|off}`` option.
|
|
|
|
Block devices
|
|
-------------
|
|
|
|
VXHS backend (removed in 5.1)
|
|
'''''''''''''''''''''''''''''
|
|
|
|
The VXHS code did not compile since v2.12.0. It was removed in 5.1.
|
|
|
|
``sheepdog`` driver (removed in 6.0)
|
|
''''''''''''''''''''''''''''''''''''
|
|
|
|
The corresponding upstream server project is no longer maintained.
|
|
Users are recommended to switch to an alternative distributed block
|
|
device driver such as RBD.
|