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 cyls=...,heads=...,secs=...,trans=... (since 2.10.0)
  98
  99 The drive geometry arguments are replaced by the the geometry arguments
 100 that can be specified with the ``-device'' parameter.
 101
 102 @subsection -drive serial=... (since 2.10.0)
 103
 104 The drive serial argument is replaced by the the serial argument
 105 that can be specified with the ``-device'' parameter.
 106
 107 @subsection -drive addr=... (since 2.10.0)
 108
 109 The drive addr argument is replaced by the the addr argument
 110 that can be specified with the ``-device'' parameter.
 111
 112 @subsection -usbdevice (since 2.10.0)
 113
 114 The ``-usbdevice DEV'' argument is now a synonym for setting
 115 the ``-device usb-DEV'' argument instead. The deprecated syntax
 116 would automatically enable USB support on the machine type.
 117 If using the new syntax, USB support must be explicitly
 118 enabled via the ``-machine usb=on'' argument.
 119
 120 @subsection -nodefconfig (since 2.11.0)
 121
 122 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
 123
 124 @subsection -balloon (since 2.12.0)
 125
 126 The @option{--balloon virtio} argument has been superseded by
 127 @option{--device virtio-balloon}.
 128
 129 @subsection -machine s390-squash-mcss=on|off (since 2.12.0)
 130
 131 The ``s390-squash-mcss=on`` property has been obsoleted by allowing the
 132 cssid to be chosen freely. Instead of squashing subchannels into the
 133 default channel subsystem image for guests that do not support multiple
 134 channel subsystems, all devices can be put into the default channel
 135 subsystem image.
 136
 137 @subsection -fsdev handle (since 2.12.0)
 138
 139 The ``handle'' fsdev backend does not support symlinks and causes the 9p
 140 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
 141 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
 142 which is not the recommended way to run QEMU. This backend should not be
 143 used and it will be removed with no replacement.
 144
 145 @subsection -no-frame (since 2.12.0)
 146
 147 The @code{--no-frame} argument works with SDL 1.2 only. The other user
 148 interfaces never implemented this in the first place. So this will be
 149 removed together with SDL 1.2 support.
 150
 151 @subsection -rtc-td-hack (since 2.12.0)
 152
 153 The @code{-rtc-td-hack} option has been replaced by
 154 @code{-rtc driftfix=slew}.
 155
 156 @subsection -localtime (since 2.12.0)
 157
 158 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 159
 160 @subsection -startdate (since 2.12.0)
 161
 162 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 163
 164 @subsection -virtioconsole (since 3.0.0)
 165
 166 Option @option{-virtioconsole} has been replaced by
 167 @option{-device virtconsole}.
 168
 169 @subsection -clock (since 3.0.0)
 170
 171 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
 172 replacement since it is not needed anymore.
 173
 174 @subsection -enable-hax (since 3.0.0)
 175
 176 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
 177 Both options have been introduced in QEMU version 2.9.0.
 178
 179 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
 180
 181 The 'file' driver for drives is no longer appropriate for character or host
 182 devices and will only accept regular files (S_IFREG). The correct driver
 183 for these file types is 'host_cdrom' or 'host_device' as appropriate.
 184
 185 @section QEMU Machine Protocol (QMP) commands
 186
 187 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
 188
 189 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 190 from qcow2 images.
 191
 192 @subsection query-cpus (since 2.12.0)
 193
 194 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 195
 196 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 197
 198 The ``arch'' output member of the ``query-cpus-fast'' command is
 199 replaced by the ``target'' output member.
 200
 201 @section System emulator devices
 202
 203 @subsection ivshmem (since 2.6.0)
 204
 205 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 206 or ``ivshmem-doorbell`` device types.
 207
 208 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
 209
 210 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
 211 should be used instead. That means that embedded 4xx PowerPC CPUs will not
 212 support page sizes < 4096 any longer.
 213
 214 @section System emulator machines
 215
 216 @subsection pc-0.10 and pc-0.11 (since 3.0)
 217
 218 These machine types are very old and likely can not be used for live migration
 219 from old QEMU versions anymore. A newer machine type should be used instead.
 220
 221 @section Device options
 222
 223 @subsection Block device options
 224
 225 @subsubsection "backing": "" (since 2.12.0)
 226
 227 In order to prevent QEMU from automatically opening an image's backing
 228 chain, use ``"backing": null'' instead.
 229
 230 @subsection vio-spapr-device device options
 231
 232 @subsubsection "irq": "" (since 3.0.0)
 233
 234 The ``irq'' property is obsoleted.