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 -machine enforce-config-section=on|off (since 3.1)
  39
  40 The @option{enforce-config-section} parameter is replaced by the
  41 @option{-global migration.send-configuration=@var{on|off}} option.
  42
  43 @subsection -no-kvm (since 1.3.0)
  44
  45 The ``-no-kvm'' argument is now a synonym for setting
  46 ``-machine accel=tcg''.
  47
  48 @subsection -usbdevice (since 2.10.0)
  49
  50 The ``-usbdevice DEV'' argument is now a synonym for setting
  51 the ``-device usb-DEV'' argument instead. The deprecated syntax
  52 would automatically enable USB support on the machine type.
  53 If using the new syntax, USB support must be explicitly
  54 enabled via the ``-machine usb=on'' argument.
  55
  56 @subsection -fsdev handle (since 2.12.0)
  57
  58 The ``handle'' fsdev backend does not support symlinks and causes the 9p
  59 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
  60 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
  61 which is not the recommended way to run QEMU. This backend should not be
  62 used and it will be removed with no replacement.
  63
  64 @subsection -no-frame (since 2.12.0)
  65
  66 The @code{--no-frame} argument works with SDL 1.2 only. The other user
  67 interfaces never implemented this in the first place. So this will be
  68 removed together with SDL 1.2 support.
  69
  70 @subsection -virtioconsole (since 3.0.0)
  71
  72 Option @option{-virtioconsole} has been replaced by
  73 @option{-device virtconsole}.
  74
  75 @subsection -clock (since 3.0.0)
  76
  77 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
  78 replacement since it is not needed anymore.
  79
  80 @subsection -enable-hax (since 3.0.0)
  81
  82 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
  83 Both options have been introduced in QEMU version 2.9.0.
  84
  85 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
  86
  87 The 'file' driver for drives is no longer appropriate for character or host
  88 devices and will only accept regular files (S_IFREG). The correct driver
  89 for these file types is 'host_cdrom' or 'host_device' as appropriate.
  90
  91 @subsection -net ...,name=@var{name} (since 3.1)
  92
  93 The @option{name} parameter of the @option{-net} option is a synonym
  94 for the @option{id} parameter, which should now be used instead.
  95
  96 @section QEMU Machine Protocol (QMP) commands
  97
  98 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
  99
 100 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 101 from qcow2 images.
 102
 103 @subsection query-cpus (since 2.12.0)
 104
 105 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 106
 107 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 108
 109 The ``arch'' output member of the ``query-cpus-fast'' command is
 110 replaced by the ``target'' output member.
 111
 112 @section System emulator human monitor commands
 113
 114 @subsection The hub_id parameter of 'hostfwd_add' / 'hostfwd_remove' (since 3.1)
 115
 116 The @option{[hub_id name]} parameter tuple of the 'hostfwd_add' and
 117 'hostfwd_remove' HMP commands has been replaced by @option{netdev_id}.
 118
 119 @section System emulator devices
 120
 121 @subsection ivshmem (since 2.6.0)
 122
 123 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 124 or ``ivshmem-doorbell`` device types.
 125
 126 @section System emulator machines
 127
 128 @subsection pc-0.10 and pc-0.11 (since 3.0)
 129
 130 These machine types are very old and likely can not be used for live migration
 131 from old QEMU versions anymore. A newer machine type should be used instead.
 132
 133 @subsection prep (PowerPC) (since 3.1)
 134
 135 This machine type uses an unmaintained firmware, broken in lots of ways,
 136 and unable to start post-2004 operating systems. 40p machine type should be
 137 used instead.
 138
 139 @section Device options
 140
 141 @subsection Block device options
 142
 143 @subsubsection "backing": "" (since 2.12.0)
 144
 145 In order to prevent QEMU from automatically opening an image's backing
 146 chain, use ``"backing": null'' instead.
 147
 148 @subsubsection rbd keyvalue pair encoded filenames: "" (since 3.1.0)
 149
 150 Options for ``rbd'' should be specified according to its runtime options,
 151 like other block drivers.  Legacy parsing of keyvalue pair encoded
 152 filenames is useful to open images with the old format for backing files;
 153 These image files should be updated to use the current format.
 154
 155 Example of legacy encoding:
 156
 157 @code{json:@{"file.driver":"rbd", "file.filename":"rbd:rbd/name"@}}
 158
 159 The above, converted to the current supported format:
 160
 161 @code{json:@{"file.driver":"rbd", "file.pool":"rbd", "file.image":"name"@}}
 162
 163 @subsection vio-spapr-device device options
 164
 165 @subsubsection "irq": "" (since 3.0.0)
 166
 167 The ``irq'' property is obsoleted.