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
10 KiB
ReStructuredText
260 lines
10 KiB
ReStructuredText
|
|
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.
|
|
|
|
``-no-kvm`` (removed in 5.2)
|
|
''''''''''''''''''''''''''''
|
|
|
|
The ``-no-kvm`` argument was a synonym for setting ``-machine accel=tcg``.
|
|
|
|
``-realtime`` (removed in 6.0)
|
|
''''''''''''''''''''''''''''''
|
|
|
|
The ``-realtime mlock=on|off`` argument has been replaced by the
|
|
``-overcommit mem-lock=on|off`` argument.
|
|
|
|
``-show-cursor`` option (since 5.0)
|
|
'''''''''''''''''''''''''''''''''''
|
|
|
|
Use ``-display sdl,show-cursor=on``, ``-display gtk,show-cursor=on``
|
|
or ``-display default,show-cursor=on`` instead.
|
|
|
|
``-tb-size`` option (removed in 6.0)
|
|
''''''''''''''''''''''''''''''''''''
|
|
|
|
QEMU 5.0 introduced an alternative syntax to specify the size of the translation
|
|
block cache, ``-accel tcg,tb-size=``.
|
|
|
|
QEMU Machine Protocol (QMP) commands
|
|
------------------------------------
|
|
|
|
``block-dirty-bitmap-add`` "autoload" parameter (removed in 4.2.0)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The "autoload" parameter has been ignored since 2.12.0. All bitmaps
|
|
are automatically loaded from qcow2 images.
|
|
|
|
``cpu-add`` (removed in 5.2)
|
|
''''''''''''''''''''''''''''
|
|
|
|
Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``. See
|
|
documentation of ``query-hotpluggable-cpus`` for additional details.
|
|
|
|
``change`` (removed in 6.0)
|
|
'''''''''''''''''''''''''''
|
|
|
|
Use ``blockdev-change-medium`` or ``change-vnc-password`` instead.
|
|
|
|
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``.
|
|
|
|
``cpu-add`` (removed in 5.2)
|
|
''''''''''''''''''''''''''''
|
|
|
|
Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``. See
|
|
documentation of ``query-hotpluggable-cpus`` for additional details.
|
|
|
|
``change vnc TARGET`` (removed in 6.0)
|
|
''''''''''''''''''''''''''''''''''''''
|
|
|
|
No replacement. The ``change vnc password`` and ``change DEVICE MEDIUM``
|
|
commands are not affected.
|
|
|
|
Guest Emulator ISAs
|
|
-------------------
|
|
|
|
RISC-V ISA privilege specification version 1.09.1 (removed in 5.1)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The RISC-V ISA privilege 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
|
|
--------------------
|
|
|
|
KVM guest support on 32-bit Arm hosts (removed in 5.2)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
The Linux kernel has dropped support for allowing 32-bit Arm systems
|
|
to host KVM guests as of the 5.7 kernel. Accordingly, QEMU is deprecating
|
|
its support for this configuration and will remove it in a future version.
|
|
Running 32-bit guests on a 64-bit Arm host remains supported.
|
|
|
|
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.
|
|
|
|
mips ``r4k`` platform (removed in 5.2)
|
|
''''''''''''''''''''''''''''''''''''''
|
|
|
|
This machine type was very old and unmaintained. Users should use the ``malta``
|
|
machine type instead.
|
|
|
|
mips ``fulong2e`` machine alias (removed in 6.0)
|
|
''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
This machine has been renamed ``fuloong2e``.
|
|
|
|
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
|
|
--------------------
|
|
|
|
``-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*.
|
|
|
|
``-numa`` node (without memory specified) (removed 5.2)
|
|
'''''''''''''''''''''''''''''''''''''''''''''''''''''''
|
|
|
|
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.
|