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 -vnc tls (since 2.5.0)
45 The ``-vnc tls'' argument is now a synonym for setting
46 ``-object tls-creds-anon,id=tls0'' combined with
47 ``-vnc tls-creds=tls0'
49 @subsection -vnc x509 (since 2.5.0)
51 The ``-vnc x509=/path/to/certs'' argument is now a
53 ``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=no''
54 combined with ``-vnc tls-creds=tls0'
56 @subsection -vnc x509verify (since 2.5.0)
58 The ``-vnc x509verify=/path/to/certs'' argument is now a
60 ``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=yes''
61 combined with ``-vnc tls-creds=tls0'
63 @subsection -tftp (since 2.6.0)
65 The ``-tftp /some/dir'' argument is replaced by either
66 ``-netdev user,id=x,tftp=/some/dir '' (for pluggable NICs, accompanied
67 with ``-device ...,netdev=x''), or ``-nic user,tftp=/some/dir''
68 (for embedded NICs). The new syntax allows different settings to be
71 @subsection -bootp (since 2.6.0)
73 The ``-bootp /some/file'' argument is replaced by either
74 ``-netdev user,id=x,bootp=/some/file '' (for pluggable NICs, accompanied
75 with ``-device ...,netdev=x''), or ``-nic user,bootp=/some/file''
76 (for embedded NICs). The new syntax allows different settings to be
79 @subsection -redir (since 2.6.0)
81 The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport'' argument is
83 ``-netdev user,id=x,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
84 (for pluggable NICs, accompanied with ``-device ...,netdev=x'') or
85 ``-nic user,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
86 (for embedded NICs). The new syntax allows different settings to be
89 @subsection -smb (since 2.6.0)
91 The ``-smb /some/dir'' argument is replaced by either
92 ``-netdev user,id=x,smb=/some/dir '' (for pluggable NICs, accompanied
93 with ``-device ...,netdev=x''), or ``-nic user,smb=/some/dir''
94 (for embedded NICs). The new syntax allows different settings to be
97 @subsection -drive serial=... (since 2.10.0)
99 The drive serial argument is replaced by the the serial argument
100 that can be specified with the ``-device'' parameter.
102 @subsection -drive addr=... (since 2.10.0)
104 The drive addr argument is replaced by the the addr argument
105 that can be specified with the ``-device'' parameter.
107 @subsection -usbdevice (since 2.10.0)
109 The ``-usbdevice DEV'' argument is now a synonym for setting
110 the ``-device usb-DEV'' argument instead. The deprecated syntax
111 would automatically enable USB support on the machine type.
112 If using the new syntax, USB support must be explicitly
113 enabled via the ``-machine usb=on'' argument.
115 @subsection -nodefconfig (since 2.11.0)
117 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
119 @subsection -balloon (since 2.12.0)
121 The @option{--balloon virtio} argument has been superseded by
122 @option{--device virtio-balloon}.
124 @subsection -machine s390-squash-mcss=on|off (since 2.12.0)
126 The ``s390-squash-mcss=on`` property has been obsoleted by allowing the
127 cssid to be chosen freely. Instead of squashing subchannels into the
128 default channel subsystem image for guests that do not support multiple
129 channel subsystems, all devices can be put into the default channel
132 @subsection -fsdev handle (since 2.12.0)
134 The ``handle'' fsdev backend does not support symlinks and causes the 9p
135 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
136 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
137 which is not the recommended way to run QEMU. This backend should not be
138 used and it will be removed with no replacement.
140 @subsection -no-frame (since 2.12.0)
142 The @code{--no-frame} argument works with SDL 1.2 only. The other user
143 interfaces never implemented this in the first place. So this will be
144 removed together with SDL 1.2 support.
146 @subsection -rtc-td-hack (since 2.12.0)
148 The @code{-rtc-td-hack} option has been replaced by
149 @code{-rtc driftfix=slew}.
151 @subsection -localtime (since 2.12.0)
153 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
155 @subsection -startdate (since 2.12.0)
157 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
159 @subsection -virtioconsole (since 3.0.0)
161 Option @option{-virtioconsole} has been replaced by
162 @option{-device virtconsole}.
164 @subsection -clock (since 3.0.0)
166 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
167 replacement since it is not needed anymore.
169 @subsection -enable-hax (since 3.0.0)
171 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
172 Both options have been introduced in QEMU version 2.9.0.
174 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
176 The 'file' driver for drives is no longer appropriate for character or host
177 devices and will only accept regular files (S_IFREG). The correct driver
178 for these file types is 'host_cdrom' or 'host_device' as appropriate.
180 @section QEMU Machine Protocol (QMP) commands
182 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
184 "autoload" parameter is now ignored. All bitmaps are automatically loaded
187 @subsection query-cpus (since 2.12.0)
189 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
191 @subsection query-cpus-fast "arch" output member (since 3.0.0)
193 The ``arch'' output member of the ``query-cpus-fast'' command is
194 replaced by the ``target'' output member.
196 @section System emulator devices
198 @subsection ivshmem (since 2.6.0)
200 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
201 or ``ivshmem-doorbell`` device types.
203 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
205 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
206 should be used instead. That means that embedded 4xx PowerPC CPUs will not
207 support page sizes < 4096 any longer.
209 @section System emulator machines
211 @subsection pc-0.10 and pc-0.11 (since 3.0)
213 These machine types are very old and likely can not be used for live migration
214 from old QEMU versions anymore. A newer machine type should be used instead.
216 @section Device options
218 @subsection Block device options
220 @subsubsection "backing": "" (since 2.12.0)
222 In order to prevent QEMU from automatically opening an image's backing
223 chain, use ``"backing": null'' instead.
225 @subsection vio-spapr-device device options
227 @subsubsection "irq": "" (since 3.0.0)
229 The ``irq'' property is obsoleted.