1 files changed, 339 insertions, 0 deletions
diff --git a/docs/about/deprecated.rst b/docs/about/deprecated.rst
new file mode 100644
index 0000000..6d438f1
--- /dev/null
+++ b/docs/about/deprecated.rst
@@ -0,0 +1,339 @@
+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 section. The feature will remain functional for the
+release in which it was deprecated and one further release. After these two
+releases, the feature is liable to be removed. 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.
+
+System emulator command line arguments
+--------------------------------------
+
+``QEMU_AUDIO_`` environment variables and ``-audio-help`` (since 4.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The ``-audiodev`` argument is now the preferred way to specify audio
+backend settings instead of environment variables.  To ease migration to
+the new format, the ``-audiodev-help`` option can be used to convert
+the current values of the environment variables to ``-audiodev`` options.
+
+Creating sound card devices and vnc without ``audiodev=`` property (since 4.2)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+When not using the deprecated legacy audio config, each sound card
+should specify an ``audiodev=`` property.  Additionally, when using
+vnc, you should specify an ``audiodev=`` property if you plan to
+transmit audio through the VNC protocol.
+
+Creating sound card devices using ``-soundhw`` (since 5.1)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Sound card devices should be created using ``-device`` instead.  The
+names are the same for most devices.  The exceptions are ``hda`` which
+needs two devices (``-device intel-hda -device hda-duplex``) and
+``pcspk`` which can be activated using ``-machine
+pcspk-audiodev=<name>``.
+
+``-chardev`` backend aliases ``tty`` and ``parport`` (since 6.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+``tty`` and ``parport`` are aliases that will be removed. Instead, the
+actual backend names ``serial`` and ``parallel`` should be used.
+
+Short-form boolean options (since 6.0)
+''''''''''''''''''''''''''''''''''''''
+
+Boolean options such as ``share=on``/``share=off`` could be written
+in short form as ``share`` and ``noshare``.  This is now deprecated
+and will cause a warning.
+
+``delay`` option for socket character devices (since 6.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The replacement for the ``nodelay`` short-form boolean option is ``nodelay=on``
+rather than ``delay=off``.
+
+``--enable-fips`` (since 6.0)
+'''''''''''''''''''''''''''''
+
+This option restricts usage of certain cryptographic algorithms when
+the host is operating in FIPS mode.
+
+If FIPS compliance is required, QEMU should be built with the ``libgcrypt``
+library enabled as a cryptography provider.
+
+Neither the ``nettle`` library, or the built-in cryptography provider are
+supported on FIPS enabled hosts.
+
+``-writeconfig`` (since 6.0)
+'''''''''''''''''''''''''''''
+
+The ``-writeconfig`` option is not able to serialize the entire contents
+of the QEMU command line.  It is thus considered a failed experiment
+and deprecated, with no current replacement.
+
+Userspace local APIC with KVM (x86, since 6.0)
+''''''''''''''''''''''''''''''''''''''''''''''
+
+Using ``-M kernel-irqchip=off`` with x86 machine types that include a local
+APIC is deprecated.  The ``split`` setting is supported, as is using
+``-M kernel-irqchip=off`` with the ISA PC machine type.
+
+hexadecimal sizes with scaling multipliers (since 6.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Input parameters that take a size value should only use a size suffix
+(such as 'k' or 'M') when the base is written in decimal, and not when
+the value is hexadecimal.  That is, '0x20M' is deprecated, and should
+be written either as '32M' or as '0x2000000'.
+
+``-spice password=string`` (since 6.0)
+''''''''''''''''''''''''''''''''''''''
+
+This option is insecure because the SPICE password remains visible in
+the process listing. This is replaced by the new ``password-secret``
+option which lets the password be securely provided on the command
+line using a ``secret`` object instance.
+
+``opened`` property of ``rng-*`` objects (since 6.0.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The only effect of specifying ``opened=on`` in the command line or QMP
+``object-add`` is that the device is opened immediately, possibly before all
+other options have been processed.  This will either have no effect (if
+``opened`` was the last option) or cause errors.  The property is therefore
+useless and should not be specified.
+
+``loaded`` property of ``secret`` and ``secret_keyring`` objects (since 6.0.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The only effect of specifying ``loaded=on`` in the command line or QMP
+``object-add`` is that the secret is loaded immediately, possibly before all
+other options have been processed.  This will either have no effect (if
+``loaded`` was the last option) or cause options to be effectively ignored as
+if they were not given.  The property is therefore useless and should not be
+specified.
+
+``-display sdl,window_close=...`` (since 6.1)
+'''''''''''''''''''''''''''''''''''''''''''''
+
+Use ``-display sdl,window-close=...`` instead (i.e. with a minus instead of
+an underscore between "window" and "close").
+
+``-no-quit`` (since 6.1)
+''''''''''''''''''''''''
+
+The ``-no-quit`` is a synonym for ``-display ...,window-close=off`` which
+should be used instead.
+
+
+QEMU Machine Protocol (QMP) commands
+------------------------------------
+
+``blockdev-open-tray``, ``blockdev-close-tray`` argument ``device`` (since 2.8.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Use argument ``id`` instead.
+
+``eject`` argument ``device`` (since 2.8.0)
+'''''''''''''''''''''''''''''''''''''''''''
+
+Use argument ``id`` instead.
+
+``blockdev-change-medium`` argument ``device`` (since 2.8.0)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Use argument ``id`` instead.
+
+``block_set_io_throttle`` argument ``device`` (since 2.8.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Use argument ``id`` instead.
+
+``blockdev-add`` empty string argument ``backing`` (since 2.10.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Use argument value ``null`` instead.
+
+``block-commit`` arguments ``base`` and ``top`` (since 3.1.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Use arguments ``base-node`` and ``top-node`` instead.
+
+``nbd-server-add`` and ``nbd-server-remove`` (since 5.2)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+Use the more generic commands ``block-export-add`` and ``block-export-del``
+instead.  As part of this deprecation, where ``nbd-server-add`` used a
+single ``bitmap``, the new ``block-export-add`` uses a list of ``bitmaps``.
+
+System accelerators
+-------------------
+
+MIPS ``Trap-and-Emul`` KVM support (since 6.0)
+''''''''''''''''''''''''''''''''''''''''''''''
+
+The MIPS ``Trap-and-Emul`` KVM host and guest support has been removed
+from Linux upstream kernel, declare it deprecated.
+
+System emulator CPUS
+--------------------
+
+``Icelake-Client`` CPU Model (since 5.2.0)
+''''''''''''''''''''''''''''''''''''''''''
+
+``Icelake-Client`` CPU Models are deprecated. Use ``Icelake-Server`` CPU
+Models instead.
+
+MIPS ``I7200`` CPU Model (since 5.2)
+''''''''''''''''''''''''''''''''''''
+
+The ``I7200`` guest CPU relies on the nanoMIPS ISA, which is deprecated
+(the ISA has never been upstreamed to a compiler toolchain). Therefore
+this CPU is also deprecated.
+
+System emulator machines
+------------------------
+
+Raspberry Pi ``raspi2`` and ``raspi3`` machines (since 5.2)
+'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+The Raspberry Pi machines come in various models (A, A+, B, B+). To be able
+to distinguish which model QEMU is implementing, the ``raspi2`` and ``raspi3``
+machines have been renamed ``raspi2b`` and ``raspi3b``.
+
+Aspeed ``swift-bmc`` machine (since 6.1)
+''''''''''''''''''''''''''''''''''''''''
+
+This machine is deprecated because we have enough AST2500 based OpenPOWER
+machines. It can be easily replaced by the ``witherspoon-bmc`` or the
+``romulus-bmc`` machines.
+
+Backend options
+---------------
+
+Using non-persistent backing file with pmem=on (since 6.1)
+''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
+
+This option is used when ``memory-backend-file`` is consumed by emulated NVDIMM
+device. However enabling ``memory-backend-file.pmem`` option, when backing file
+is (a) not DAX capable or (b) not on a filesystem that support direct mapping
+of persistent memory, is not safe and may lead to data loss or corruption in case
+of host crash.
+Options are:
+
+    - modify VM configuration to set ``pmem=off`` to continue using fake NVDIMM
+      (without persistence guaranties) with backing file on non DAX storage
+    - move backing file to NVDIMM storage and keep ``pmem=on``
+      (to have NVDIMM with persistence guaranties).
+
+Device options
+--------------
+
+Emulated device options
+'''''''''''''''''''''''
+
+``-device virtio-blk,scsi=on|off`` (since 5.0.0)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature.  VIRTIO 1.0
+and later do not support it because the virtio-scsi device was introduced for
+full SCSI support.  Use virtio-scsi instead when SCSI passthrough is required.
+
+Note this also applies to ``-device virtio-blk-pci,scsi=on|off``, which is an
+alias.
+
+Block device options
+''''''''''''''''''''
+
+``"backing": ""`` (since 2.12.0)
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+In order to prevent QEMU from automatically opening an image's backing
+chain, use ``"backing": null`` instead.
+
+``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::
+
+  json:{"file.driver":"rbd", "file.filename":"rbd:rbd/name"}
+
+The above, converted to the current supported format::
+
+  json:{"file.driver":"rbd", "file.pool":"rbd", "file.image":"name"}
+
+linux-user mode CPUs
+--------------------
+
+``ppc64abi32`` CPUs (since 5.2.0)
+'''''''''''''''''''''''''''''''''
+
+The ``ppc64abi32`` architecture has a number of issues which regularly
+trip up our CI testing and is suspected to be quite broken. For that
+reason the maintainers strongly suspect no one actually uses it.
+
+MIPS ``I7200`` CPU (since 5.2)
+''''''''''''''''''''''''''''''
+
+The ``I7200`` guest CPU relies on the nanoMIPS ISA, which is deprecated
+(the ISA has never been upstreamed to a compiler toolchain). Therefore
+this CPU is also deprecated.
+
+Related binaries
+----------------
+
+Backwards compatibility
+-----------------------
+
+Runnability guarantee of CPU models (since 4.1.0)
+'''''''''''''''''''''''''''''''''''''''''''''''''
+
+Previous versions of QEMU never changed existing CPU models in
+ways that introduced additional host software or hardware
+requirements to the VM.  This allowed management software to
+safely change the machine type of an existing VM without
+introducing new requirements ("runnability guarantee").  This
+prevented CPU models from being updated to include CPU
+vulnerability mitigations, leaving guests vulnerable in the
+default configuration.
+
+The CPU model runnability guarantee won't apply anymore to
+existing CPU models.  Management software that needs runnability
+guarantees must resolve the CPU model aliases using the
+``alias-of`` field returned by the ``query-cpu-definitions`` QMP
+command.
+
+While those guarantees are kept, the return value of
+``query-cpu-definitions`` will have existing CPU model aliases
+point to a version that doesn't break runnability guarantees
+(specifically, version 1 of those CPU models).  In future QEMU
+versions, aliases will point to newer CPU model versions
+depending on the machine type, so management software must
+resolve CPU model aliases before starting a virtual machine.
+
+Guest Emulator ISAs
+-------------------
+
+nanoMIPS ISA
+''''''''''''
+
+The ``nanoMIPS`` ISA has never been upstreamed to any compiler toolchain.
+As it is hard to generate binaries for it, declare it deprecated.