mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-24 20:19:44 +00:00
bc1fb850a3
-smp [cpus],sockets/cores/threads[,maxcpus] should describe topology so that total number of logical CPUs [sockets * cores * threads] would be equal to [maxcpus], however historically we didn't have such check in QEMU and it is possible to start VM with an invalid topology. Deprecate invalid options combination so we can make sure that the topology VM started with is always correct in the future. Users with an invalid sockets/cores/threads/maxcpus values should fix their CLI to make sure that [sockets * cores * threads] == [maxcpus] Signed-off-by: Igor Mammedov <imammedo@redhat.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Message-Id: <1536836762-273036-2-git-send-email-imammedo@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> [ehabkost: squashed unit test fix] Message-Id: <20181019215345.521d58d7@igors-macbook-pro.local> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
173 lines
6.0 KiB
Plaintext
173 lines
6.0 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.
|
|
|
|
@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.
|