1 @node Deprecated features
2 @appendix Deprecated features
4 In general features are intended to be supported indefinitely once
5 introduced into QEMU. In the event that a feature needs to be removed,
6 it will be listed in this appendix. The feature will remain functional
7 for 2 releases prior to actual removal. Deprecated features may also
8 generate warnings on the console when QEMU starts up, or if activated
9 via a monitor command, however, this is not a mandatory requirement.
11 Prior to the 2.10.0 release there was no official policy on how
12 long features would be deprecated prior to their removal, nor
13 any documented list of which features were deprecated. Thus
14 any features deprecated prior to 2.10.0 will be treated as if
15 they were first deprecated in the 2.10.0 release.
17 What follows is a list of all features currently marked as
20 @section Build options
24 Previously QEMU has supported building against both GTK 2.x
25 and 3.x series APIs. Support for the GTK 2.x builds will be
26 discontinued, so maintainers should switch to using GTK 3.x,
31 Previously QEMU has supported building against both SDL 1.2
32 and 2.0 series APIs. Support for the SDL 1.2 builds will be
33 discontinued, so maintainers should switch to using SDL 2.0,
36 @section System emulator command line arguments
38 @subsection -no-kvm (since 1.3.0)
40 The ``-no-kvm'' argument is now a synonym for setting
41 ``-machine accel=tcg''.
43 @subsection -tftp (since 2.6.0)
45 The ``-tftp /some/dir'' argument is replaced by either
46 ``-netdev user,id=x,tftp=/some/dir '' (for pluggable NICs, accompanied
47 with ``-device ...,netdev=x''), or ``-nic user,tftp=/some/dir''
48 (for embedded NICs). The new syntax allows different settings to be
51 @subsection -bootp (since 2.6.0)
53 The ``-bootp /some/file'' argument is replaced by either
54 ``-netdev user,id=x,bootp=/some/file '' (for pluggable NICs, accompanied
55 with ``-device ...,netdev=x''), or ``-nic user,bootp=/some/file''
56 (for embedded NICs). The new syntax allows different settings to be
59 @subsection -redir (since 2.6.0)
61 The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport'' argument is
63 ``-netdev user,id=x,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
64 (for pluggable NICs, accompanied with ``-device ...,netdev=x'') or
65 ``-nic user,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
66 (for embedded NICs). The new syntax allows different settings to be
69 @subsection -smb (since 2.6.0)
71 The ``-smb /some/dir'' argument is replaced by either
72 ``-netdev user,id=x,smb=/some/dir '' (for pluggable NICs, accompanied
73 with ``-device ...,netdev=x''), or ``-nic user,smb=/some/dir''
74 (for embedded NICs). The new syntax allows different settings to be
77 @subsection -usbdevice (since 2.10.0)
79 The ``-usbdevice DEV'' argument is now a synonym for setting
80 the ``-device usb-DEV'' argument instead. The deprecated syntax
81 would automatically enable USB support on the machine type.
82 If using the new syntax, USB support must be explicitly
83 enabled via the ``-machine usb=on'' argument.
85 @subsection -nodefconfig (since 2.11.0)
87 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
89 @subsection -fsdev handle (since 2.12.0)
91 The ``handle'' fsdev backend does not support symlinks and causes the 9p
92 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
93 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
94 which is not the recommended way to run QEMU. This backend should not be
95 used and it will be removed with no replacement.
97 @subsection -no-frame (since 2.12.0)
99 The @code{--no-frame} argument works with SDL 1.2 only. The other user
100 interfaces never implemented this in the first place. So this will be
101 removed together with SDL 1.2 support.
103 @subsection -rtc-td-hack (since 2.12.0)
105 The @code{-rtc-td-hack} option has been replaced by
106 @code{-rtc driftfix=slew}.
108 @subsection -localtime (since 2.12.0)
110 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
112 @subsection -startdate (since 2.12.0)
114 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
116 @subsection -virtioconsole (since 3.0.0)
118 Option @option{-virtioconsole} has been replaced by
119 @option{-device virtconsole}.
121 @subsection -clock (since 3.0.0)
123 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
124 replacement since it is not needed anymore.
126 @subsection -enable-hax (since 3.0.0)
128 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
129 Both options have been introduced in QEMU version 2.9.0.
131 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
133 The 'file' driver for drives is no longer appropriate for character or host
134 devices and will only accept regular files (S_IFREG). The correct driver
135 for these file types is 'host_cdrom' or 'host_device' as appropriate.
137 @section QEMU Machine Protocol (QMP) commands
139 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
141 "autoload" parameter is now ignored. All bitmaps are automatically loaded
144 @subsection query-cpus (since 2.12.0)
146 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
148 @subsection query-cpus-fast "arch" output member (since 3.0.0)
150 The ``arch'' output member of the ``query-cpus-fast'' command is
151 replaced by the ``target'' output member.
153 @section System emulator devices
155 @subsection ivshmem (since 2.6.0)
157 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
158 or ``ivshmem-doorbell`` device types.
160 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
162 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
163 should be used instead. That means that embedded 4xx PowerPC CPUs will not
164 support page sizes < 4096 any longer.
166 @section System emulator machines
168 @subsection pc-0.10 and pc-0.11 (since 3.0)
170 These machine types are very old and likely can not be used for live migration
171 from old QEMU versions anymore. A newer machine type should be used instead.
173 @subsection prep (PowerPC) (since 3.1)
175 This machine type uses an unmaintained firmware, broken in lots of ways,
176 and unable to start post-2004 operating systems. 40p machine type should be
179 @section Device options
181 @subsection Block device options
183 @subsubsection "backing": "" (since 2.12.0)
185 In order to prevent QEMU from automatically opening an image's backing
186 chain, use ``"backing": null'' instead.
188 @subsection vio-spapr-device device options
190 @subsubsection "irq": "" (since 3.0.0)
192 The ``irq'' property is obsoleted.