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qemu/qemu-deprecated.texi
Markus Armbruster 44c67847e3 qemu-doc: Move appendix "Deprecated features" to its own file 
Consumers of QEMU need to track feature deprecation.  Keeping
deprecation documentation in its own file helps in two small ways:

* You can track changes the easy and obvious way, with git-log.
  Before, you had to resort to more complex gittery like "git-log
  --oneline -L '/@node Deprecated features/,/@node Supported build
  platforms/:qemu-doc.texi'"

* It lets us use MAINTAINERS to copy interested parties on deprecation
  patches, so they can advise or object before they're a done deal.
  The next commit will do that for libvirt.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180716073226.21127-2-armbru@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2018-07-16 15:43:06 +02:00

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@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 GTK 2.x
Previously QEMU has supported building against both GTK 2.x
and 3.x series APIs. Support for the GTK 2.x builds will be
discontinued, so maintainers should switch to using GTK 3.x,
which is the default.
@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 -no-kvm (since 1.3.0)
The ``-no-kvm'' argument is now a synonym for setting
``-machine accel=tcg''.
@subsection -vnc tls (since 2.5.0)
The ``-vnc tls'' argument is now a synonym for setting
``-object tls-creds-anon,id=tls0'' combined with
``-vnc tls-creds=tls0'
@subsection -vnc x509 (since 2.5.0)
The ``-vnc x509=/path/to/certs'' argument is now a
synonym for setting
``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=no''
combined with ``-vnc tls-creds=tls0'
@subsection -vnc x509verify (since 2.5.0)
The ``-vnc x509verify=/path/to/certs'' argument is now a
synonym for setting
``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=yes''
combined with ``-vnc tls-creds=tls0'
@subsection -tftp (since 2.6.0)
The ``-tftp /some/dir'' argument is replaced by either
``-netdev user,id=x,tftp=/some/dir '' (for pluggable NICs, accompanied
with ``-device ...,netdev=x''), or ``-nic user,tftp=/some/dir''
(for embedded NICs). The new syntax allows different settings to be
provided per NIC.
@subsection -bootp (since 2.6.0)
The ``-bootp /some/file'' argument is replaced by either
``-netdev user,id=x,bootp=/some/file '' (for pluggable NICs, accompanied
with ``-device ...,netdev=x''), or ``-nic user,bootp=/some/file''
(for embedded NICs). The new syntax allows different settings to be
provided per NIC.
@subsection -redir (since 2.6.0)
The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport'' argument is
replaced by either
``-netdev user,id=x,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
(for pluggable NICs, accompanied with ``-device ...,netdev=x'') or
``-nic user,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
(for embedded NICs). The new syntax allows different settings to be
provided per NIC.
@subsection -smb (since 2.6.0)
The ``-smb /some/dir'' argument is replaced by either
``-netdev user,id=x,smb=/some/dir '' (for pluggable NICs, accompanied
with ``-device ...,netdev=x''), or ``-nic user,smb=/some/dir''
(for embedded NICs). The new syntax allows different settings to be
provided per NIC.
@subsection -drive cyls=...,heads=...,secs=...,trans=... (since 2.10.0)
The drive geometry arguments are replaced by the the geometry arguments
that can be specified with the ``-device'' parameter.
@subsection -drive serial=... (since 2.10.0)
The drive serial argument is replaced by the the serial argument
that can be specified with the ``-device'' parameter.
@subsection -drive addr=... (since 2.10.0)
The drive addr argument is replaced by the the addr argument
that can be specified with the ``-device'' parameter.
@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 -nodefconfig (since 2.11.0)
The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
@subsection -balloon (since 2.12.0)
The @option{--balloon virtio} argument has been superseded by
@option{--device virtio-balloon}.
@subsection -machine s390-squash-mcss=on|off (since 2.12.0)
The ``s390-squash-mcss=on`` property has been obsoleted by allowing the
cssid to be chosen freely. Instead of squashing subchannels into the
default channel subsystem image for guests that do not support multiple
channel subsystems, all devices can be put into the default channel
subsystem image.
@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 -rtc-td-hack (since 2.12.0)
The @code{-rtc-td-hack} option has been replaced by
@code{-rtc driftfix=slew}.
@subsection -localtime (since 2.12.0)
The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
@subsection -startdate (since 2.12.0)
The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
@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.
@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 devices
@subsection ivshmem (since 2.6.0)
The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
or ``ivshmem-doorbell`` device types.
@subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
should be used instead. That means that embedded 4xx PowerPC CPUs will not
support page sizes < 4096 any longer.
@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.
@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.
@subsection vio-spapr-device device options
@subsubsection "irq": "" (since 3.0.0)
The ``irq'' property is obsoleted.
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