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 -usbdevice (since 2.10.0)
99 The ``-usbdevice DEV'' argument is now a synonym for setting
100 the ``-device usb-DEV'' argument instead. The deprecated syntax
101 would automatically enable USB support on the machine type.
102 If using the new syntax, USB support must be explicitly
103 enabled via the ``-machine usb=on'' argument.
105 @subsection -nodefconfig (since 2.11.0)
107 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
109 @subsection -balloon (since 2.12.0)
111 The @option{--balloon virtio} argument has been superseded by
112 @option{--device virtio-balloon}.
114 @subsection -fsdev handle (since 2.12.0)
116 The ``handle'' fsdev backend does not support symlinks and causes the 9p
117 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
118 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
119 which is not the recommended way to run QEMU. This backend should not be
120 used and it will be removed with no replacement.
122 @subsection -no-frame (since 2.12.0)
124 The @code{--no-frame} argument works with SDL 1.2 only. The other user
125 interfaces never implemented this in the first place. So this will be
126 removed together with SDL 1.2 support.
128 @subsection -rtc-td-hack (since 2.12.0)
130 The @code{-rtc-td-hack} option has been replaced by
131 @code{-rtc driftfix=slew}.
133 @subsection -localtime (since 2.12.0)
135 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
137 @subsection -startdate (since 2.12.0)
139 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
141 @subsection -virtioconsole (since 3.0.0)
143 Option @option{-virtioconsole} has been replaced by
144 @option{-device virtconsole}.
146 @subsection -clock (since 3.0.0)
148 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
149 replacement since it is not needed anymore.
151 @subsection -enable-hax (since 3.0.0)
153 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
154 Both options have been introduced in QEMU version 2.9.0.
156 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
158 The 'file' driver for drives is no longer appropriate for character or host
159 devices and will only accept regular files (S_IFREG). The correct driver
160 for these file types is 'host_cdrom' or 'host_device' as appropriate.
162 @section QEMU Machine Protocol (QMP) commands
164 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
166 "autoload" parameter is now ignored. All bitmaps are automatically loaded
169 @subsection query-cpus (since 2.12.0)
171 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
173 @subsection query-cpus-fast "arch" output member (since 3.0.0)
175 The ``arch'' output member of the ``query-cpus-fast'' command is
176 replaced by the ``target'' output member.
178 @section System emulator devices
180 @subsection ivshmem (since 2.6.0)
182 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
183 or ``ivshmem-doorbell`` device types.
185 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
187 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
188 should be used instead. That means that embedded 4xx PowerPC CPUs will not
189 support page sizes < 4096 any longer.
191 @section System emulator machines
193 @subsection pc-0.10 and pc-0.11 (since 3.0)
195 These machine types are very old and likely can not be used for live migration
196 from old QEMU versions anymore. A newer machine type should be used instead.
198 @subsection prep (PowerPC) (since 3.1)
200 This machine type uses an unmaintained firmware, broken in lots of ways,
201 and unable to start post-2004 operating systems. 40p machine type should be
204 @section Device options
206 @subsection Block device options
208 @subsubsection "backing": "" (since 2.12.0)
210 In order to prevent QEMU from automatically opening an image's backing
211 chain, use ``"backing": null'' instead.
213 @subsection vio-spapr-device device options
215 @subsubsection "irq": "" (since 3.0.0)
217 The ``irq'' property is obsoleted.