qemu-deprecated.texi

   1 @node Deprecated features
   2 @appendix Deprecated features
   3
   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.
  10
  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.
  16
  17 What follows is a list of all features currently marked as
  18 deprecated.
  19
  20 @section Build options
  21
  22 @subsection GTK 2.x
  23
  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,
  27 which is the default.
  28
  29 @subsection SDL 1.2
  30
  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,
  34 which is the default.
  35
  36 @section System emulator command line arguments
  37
  38 @subsection -no-kvm (since 1.3.0)
  39
  40 The ``-no-kvm'' argument is now a synonym for setting
  41 ``-machine accel=tcg''.
  42
  43 @subsection -vnc tls (since 2.5.0)
  44
  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'
  48
  49 @subsection -vnc x509 (since 2.5.0)
  50
  51 The ``-vnc x509=/path/to/certs'' argument is now a
  52 synonym for setting
  53 ``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=no''
  54 combined with ``-vnc tls-creds=tls0'
  55
  56 @subsection -vnc x509verify (since 2.5.0)
  57
  58 The ``-vnc x509verify=/path/to/certs'' argument is now a
  59 synonym for setting
  60 ``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=yes''
  61 combined with ``-vnc tls-creds=tls0'
  62
  63 @subsection -tftp (since 2.6.0)
  64
  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
  69 provided per NIC.
  70
  71 @subsection -bootp (since 2.6.0)
  72
  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
  77 provided per NIC.
  78
  79 @subsection -redir (since 2.6.0)
  80
  81 The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport'' argument is
  82 replaced by either
  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
  87 provided per NIC.
  88
  89 @subsection -smb (since 2.6.0)
  90
  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
  95 provided per NIC.
  96
  97 @subsection -drive serial=... (since 2.10.0)
  98
  99 The drive serial argument is replaced by the the serial argument
 100 that can be specified with the ``-device'' parameter.
 101
 102 @subsection -drive addr=... (since 2.10.0)
 103
 104 The drive addr argument is replaced by the the addr argument
 105 that can be specified with the ``-device'' parameter.
 106
 107 @subsection -usbdevice (since 2.10.0)
 108
 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.
 114
 115 @subsection -nodefconfig (since 2.11.0)
 116
 117 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
 118
 119 @subsection -balloon (since 2.12.0)
 120
 121 The @option{--balloon virtio} argument has been superseded by
 122 @option{--device virtio-balloon}.
 123
 124 @subsection -machine s390-squash-mcss=on|off (since 2.12.0)
 125
 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
 130 subsystem image.
 131
 132 @subsection -fsdev handle (since 2.12.0)
 133
 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.
 139
 140 @subsection -no-frame (since 2.12.0)
 141
 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.
 145
 146 @subsection -rtc-td-hack (since 2.12.0)
 147
 148 The @code{-rtc-td-hack} option has been replaced by
 149 @code{-rtc driftfix=slew}.
 150
 151 @subsection -localtime (since 2.12.0)
 152
 153 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 154
 155 @subsection -startdate (since 2.12.0)
 156
 157 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 158
 159 @subsection -virtioconsole (since 3.0.0)
 160
 161 Option @option{-virtioconsole} has been replaced by
 162 @option{-device virtconsole}.
 163
 164 @subsection -clock (since 3.0.0)
 165
 166 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
 167 replacement since it is not needed anymore.
 168
 169 @subsection -enable-hax (since 3.0.0)
 170
 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.
 173
 174 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
 175
 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.
 179
 180 @section QEMU Machine Protocol (QMP) commands
 181
 182 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
 183
 184 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 185 from qcow2 images.
 186
 187 @subsection query-cpus (since 2.12.0)
 188
 189 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 190
 191 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 192
 193 The ``arch'' output member of the ``query-cpus-fast'' command is
 194 replaced by the ``target'' output member.
 195
 196 @section System emulator devices
 197
 198 @subsection ivshmem (since 2.6.0)
 199
 200 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 201 or ``ivshmem-doorbell`` device types.
 202
 203 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
 204
 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.
 208
 209 @section System emulator machines
 210
 211 @subsection pc-0.10 and pc-0.11 (since 3.0)
 212
 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.
 215
 216 @section Device options
 217
 218 @subsection Block device options
 219
 220 @subsubsection "backing": "" (since 2.12.0)
 221
 222 In order to prevent QEMU from automatically opening an image's backing
 223 chain, use ``"backing": null'' instead.
 224
 225 @subsection vio-spapr-device device options
 226
 227 @subsubsection "irq": "" (since 3.0.0)
 228
 229 The ``irq'' property is obsoleted.