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 -usbdevice (since 2.10.0)
  44
  45 The ``-usbdevice DEV'' argument is now a synonym for setting
  46 the ``-device usb-DEV'' argument instead. The deprecated syntax
  47 would automatically enable USB support on the machine type.
  48 If using the new syntax, USB support must be explicitly
  49 enabled via the ``-machine usb=on'' argument.
  50
  51 @subsection -fsdev handle (since 2.12.0)
  52
  53 The ``handle'' fsdev backend does not support symlinks and causes the 9p
  54 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
  55 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
  56 which is not the recommended way to run QEMU. This backend should not be
  57 used and it will be removed with no replacement.
  58
  59 @subsection -no-frame (since 2.12.0)
  60
  61 The @code{--no-frame} argument works with SDL 1.2 only. The other user
  62 interfaces never implemented this in the first place. So this will be
  63 removed together with SDL 1.2 support.
  64
  65 @subsection -virtioconsole (since 3.0.0)
  66
  67 Option @option{-virtioconsole} has been replaced by
  68 @option{-device virtconsole}.
  69
  70 @subsection -clock (since 3.0.0)
  71
  72 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
  73 replacement since it is not needed anymore.
  74
  75 @subsection -enable-hax (since 3.0.0)
  76
  77 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
  78 Both options have been introduced in QEMU version 2.9.0.
  79
  80 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
  81
  82 The 'file' driver for drives is no longer appropriate for character or host
  83 devices and will only accept regular files (S_IFREG). The correct driver
  84 for these file types is 'host_cdrom' or 'host_device' as appropriate.
  85
  86 @section QEMU Machine Protocol (QMP) commands
  87
  88 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
  89
  90 "autoload" parameter is now ignored. All bitmaps are automatically loaded
  91 from qcow2 images.
  92
  93 @subsection query-cpus (since 2.12.0)
  94
  95 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
  96
  97 @subsection query-cpus-fast "arch" output member (since 3.0.0)
  98
  99 The ``arch'' output member of the ``query-cpus-fast'' command is
 100 replaced by the ``target'' output member.
 101
 102 @section System emulator devices
 103
 104 @subsection ivshmem (since 2.6.0)
 105
 106 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 107 or ``ivshmem-doorbell`` device types.
 108
 109 @section System emulator machines
 110
 111 @subsection pc-0.10 and pc-0.11 (since 3.0)
 112
 113 These machine types are very old and likely can not be used for live migration
 114 from old QEMU versions anymore. A newer machine type should be used instead.
 115
 116 @subsection prep (PowerPC) (since 3.1)
 117
 118 This machine type uses an unmaintained firmware, broken in lots of ways,
 119 and unable to start post-2004 operating systems. 40p machine type should be
 120 used instead.
 121
 122 @section Device options
 123
 124 @subsection Block device options
 125
 126 @subsubsection "backing": "" (since 2.12.0)
 127
 128 In order to prevent QEMU from automatically opening an image's backing
 129 chain, use ``"backing": null'' instead.
 130
 131 @subsection vio-spapr-device device options
 132
 133 @subsubsection "irq": "" (since 3.0.0)
 134
 135 The ``irq'' property is obsoleted.