mirror of https://gitee.com/openkylin/qemu.git
180 lines
6.3 KiB
Plaintext
180 lines
6.3 KiB
Plaintext
@node Deprecated features
|
|
@appendix Deprecated features
|
|
|
|
In general features are intended to be supported indefinitely once
|
|
introduced into QEMU. In the event that a feature needs to be removed,
|
|
it will be listed in this appendix. The feature will remain functional
|
|
for 2 releases prior to actual removal. Deprecated features may also
|
|
generate warnings on the console when QEMU starts up, or if activated
|
|
via a monitor command, however, this is not a mandatory requirement.
|
|
|
|
Prior to the 2.10.0 release there was no official policy on how
|
|
long features would be deprecated prior to their removal, nor
|
|
any documented list of which features were deprecated. Thus
|
|
any features deprecated prior to 2.10.0 will be treated as if
|
|
they were first deprecated in the 2.10.0 release.
|
|
|
|
What follows is a list of all features currently marked as
|
|
deprecated.
|
|
|
|
@section Build options
|
|
|
|
@subsection SDL 1.2
|
|
|
|
Previously QEMU has supported building against both SDL 1.2
|
|
and 2.0 series APIs. Support for the SDL 1.2 builds will be
|
|
discontinued, so maintainers should switch to using SDL 2.0,
|
|
which is the default.
|
|
|
|
@section System emulator command line arguments
|
|
|
|
@subsection -machine enforce-config-section=on|off (since 3.1)
|
|
|
|
The @option{enforce-config-section} parameter is replaced by the
|
|
@option{-global migration.send-configuration=@var{on|off}} option.
|
|
|
|
@subsection -no-kvm (since 1.3.0)
|
|
|
|
The ``-no-kvm'' argument is now a synonym for setting
|
|
``-machine accel=tcg''.
|
|
|
|
@subsection -usbdevice (since 2.10.0)
|
|
|
|
The ``-usbdevice DEV'' argument is now a synonym for setting
|
|
the ``-device usb-DEV'' argument instead. The deprecated syntax
|
|
would automatically enable USB support on the machine type.
|
|
If using the new syntax, USB support must be explicitly
|
|
enabled via the ``-machine usb=on'' argument.
|
|
|
|
@subsection -fsdev handle (since 2.12.0)
|
|
|
|
The ``handle'' fsdev backend does not support symlinks and causes the 9p
|
|
filesystem in the guest to fail a fair amount of tests from the PJD POSIX
|
|
filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
|
|
which is not the recommended way to run QEMU. This backend should not be
|
|
used and it will be removed with no replacement.
|
|
|
|
@subsection -no-frame (since 2.12.0)
|
|
|
|
The @code{--no-frame} argument works with SDL 1.2 only. The other user
|
|
interfaces never implemented this in the first place. So this will be
|
|
removed together with SDL 1.2 support.
|
|
|
|
@subsection -virtioconsole (since 3.0.0)
|
|
|
|
Option @option{-virtioconsole} has been replaced by
|
|
@option{-device virtconsole}.
|
|
|
|
@subsection -clock (since 3.0.0)
|
|
|
|
The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
|
|
replacement since it is not needed anymore.
|
|
|
|
@subsection -enable-hax (since 3.0.0)
|
|
|
|
The @option{-enable-hax} option has been replaced by @option{-accel hax}.
|
|
Both options have been introduced in QEMU version 2.9.0.
|
|
|
|
@subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
|
|
|
|
The 'file' driver for drives is no longer appropriate for character or host
|
|
devices and will only accept regular files (S_IFREG). The correct driver
|
|
for these file types is 'host_cdrom' or 'host_device' as appropriate.
|
|
|
|
@subsection -net ...,name=@var{name} (since 3.1)
|
|
|
|
The @option{name} parameter of the @option{-net} option is a synonym
|
|
for the @option{id} parameter, which should now be used instead.
|
|
|
|
@subsection -smp (invalid topologies) (since 3.1)
|
|
|
|
CPU topology properties should describe whole machine topology including
|
|
possible CPUs.
|
|
|
|
However, historically it was possible to start QEMU with an incorrect topology
|
|
where @math{@var{n} <= @var{sockets} * @var{cores} * @var{threads} < @var{maxcpus}},
|
|
which could lead to an incorrect topology enumeration by the guest.
|
|
Support for invalid topologies will be removed, the user must ensure
|
|
topologies described with -smp include all possible cpus, i.e.
|
|
@math{@var{sockets} * @var{cores} * @var{threads} = @var{maxcpus}}.
|
|
|
|
@section QEMU Machine Protocol (QMP) commands
|
|
|
|
@subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
|
|
|
|
"autoload" parameter is now ignored. All bitmaps are automatically loaded
|
|
from qcow2 images.
|
|
|
|
@subsection query-cpus (since 2.12.0)
|
|
|
|
The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
|
|
|
|
@subsection query-cpus-fast "arch" output member (since 3.0.0)
|
|
|
|
The ``arch'' output member of the ``query-cpus-fast'' command is
|
|
replaced by the ``target'' output member.
|
|
|
|
@section System emulator human monitor commands
|
|
|
|
@subsection The hub_id parameter of 'hostfwd_add' / 'hostfwd_remove' (since 3.1)
|
|
|
|
The @option{[hub_id name]} parameter tuple of the 'hostfwd_add' and
|
|
'hostfwd_remove' HMP commands has been replaced by @option{netdev_id}.
|
|
|
|
@section System emulator devices
|
|
|
|
@subsection ivshmem (since 2.6.0)
|
|
|
|
The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
|
|
or ``ivshmem-doorbell`` device types.
|
|
|
|
@subsection bluetooth (since 3.1)
|
|
|
|
The bluetooth subsystem is unmaintained since many years and likely bitrotten
|
|
quite a bit. It will be removed without replacement unless some users speaks
|
|
up at the @email{qemu-devel@@nongnu.org} mailing list with information about
|
|
their usecases.
|
|
|
|
@section System emulator machines
|
|
|
|
@subsection pc-0.10 and pc-0.11 (since 3.0)
|
|
|
|
These machine types are very old and likely can not be used for live migration
|
|
from old QEMU versions anymore. A newer machine type should be used instead.
|
|
|
|
@subsection prep (PowerPC) (since 3.1)
|
|
|
|
This machine type uses an unmaintained firmware, broken in lots of ways,
|
|
and unable to start post-2004 operating systems. 40p machine type should be
|
|
used instead.
|
|
|
|
@section Device options
|
|
|
|
@subsection Block device options
|
|
|
|
@subsubsection "backing": "" (since 2.12.0)
|
|
|
|
In order to prevent QEMU from automatically opening an image's backing
|
|
chain, use ``"backing": null'' instead.
|
|
|
|
@subsubsection rbd keyvalue pair encoded filenames: "" (since 3.1.0)
|
|
|
|
Options for ``rbd'' should be specified according to its runtime options,
|
|
like other block drivers. Legacy parsing of keyvalue pair encoded
|
|
filenames is useful to open images with the old format for backing files;
|
|
These image files should be updated to use the current format.
|
|
|
|
Example of legacy encoding:
|
|
|
|
@code{json:@{"file.driver":"rbd", "file.filename":"rbd:rbd/name"@}}
|
|
|
|
The above, converted to the current supported format:
|
|
|
|
@code{json:@{"file.driver":"rbd", "file.pool":"rbd", "file.image":"name"@}}
|
|
|
|
@subsection vio-spapr-device device options
|
|
|
|
@subsubsection "irq": "" (since 3.0.0)
|
|
|
|
The ``irq'' property is obsoleted.
|