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 -tftp (since 2.6.0)
  44
  45 The ``-tftp /some/dir'' argument is replaced by either
  46 ``-netdev user,id=x,tftp=/some/dir '' (for pluggable NICs, accompanied
  47 with ``-device ...,netdev=x''), or ``-nic user,tftp=/some/dir''
  48 (for embedded NICs). The new syntax allows different settings to be
  49 provided per NIC.
  50
  51 @subsection -bootp (since 2.6.0)
  52
  53 The ``-bootp /some/file'' argument is replaced by either
  54 ``-netdev user,id=x,bootp=/some/file '' (for pluggable NICs, accompanied
  55 with ``-device ...,netdev=x''), or ``-nic user,bootp=/some/file''
  56 (for embedded NICs). The new syntax allows different settings to be
  57 provided per NIC.
  58
  59 @subsection -redir (since 2.6.0)
  60
  61 The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport'' argument is
  62 replaced by either
  63 ``-netdev user,id=x,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
  64 (for pluggable NICs, accompanied with ``-device ...,netdev=x'') or
  65 ``-nic user,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
  66 (for embedded NICs). The new syntax allows different settings to be
  67 provided per NIC.
  68
  69 @subsection -smb (since 2.6.0)
  70
  71 The ``-smb /some/dir'' argument is replaced by either
  72 ``-netdev user,id=x,smb=/some/dir '' (for pluggable NICs, accompanied
  73 with ``-device ...,netdev=x''), or ``-nic user,smb=/some/dir''
  74 (for embedded NICs). The new syntax allows different settings to be
  75 provided per NIC.
  76
  77 @subsection -usbdevice (since 2.10.0)
  78
  79 The ``-usbdevice DEV'' argument is now a synonym for setting
  80 the ``-device usb-DEV'' argument instead. The deprecated syntax
  81 would automatically enable USB support on the machine type.
  82 If using the new syntax, USB support must be explicitly
  83 enabled via the ``-machine usb=on'' argument.
  84
  85 @subsection -nodefconfig (since 2.11.0)
  86
  87 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
  88
  89 @subsection -fsdev handle (since 2.12.0)
  90
  91 The ``handle'' fsdev backend does not support symlinks and causes the 9p
  92 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
  93 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
  94 which is not the recommended way to run QEMU. This backend should not be
  95 used and it will be removed with no replacement.
  96
  97 @subsection -no-frame (since 2.12.0)
  98
  99 The @code{--no-frame} argument works with SDL 1.2 only. The other user
 100 interfaces never implemented this in the first place. So this will be
 101 removed together with SDL 1.2 support.
 102
 103 @subsection -rtc-td-hack (since 2.12.0)
 104
 105 The @code{-rtc-td-hack} option has been replaced by
 106 @code{-rtc driftfix=slew}.
 107
 108 @subsection -localtime (since 2.12.0)
 109
 110 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 111
 112 @subsection -startdate (since 2.12.0)
 113
 114 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 115
 116 @subsection -virtioconsole (since 3.0.0)
 117
 118 Option @option{-virtioconsole} has been replaced by
 119 @option{-device virtconsole}.
 120
 121 @subsection -clock (since 3.0.0)
 122
 123 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
 124 replacement since it is not needed anymore.
 125
 126 @subsection -enable-hax (since 3.0.0)
 127
 128 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
 129 Both options have been introduced in QEMU version 2.9.0.
 130
 131 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
 132
 133 The 'file' driver for drives is no longer appropriate for character or host
 134 devices and will only accept regular files (S_IFREG). The correct driver
 135 for these file types is 'host_cdrom' or 'host_device' as appropriate.
 136
 137 @section QEMU Machine Protocol (QMP) commands
 138
 139 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
 140
 141 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 142 from qcow2 images.
 143
 144 @subsection query-cpus (since 2.12.0)
 145
 146 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 147
 148 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 149
 150 The ``arch'' output member of the ``query-cpus-fast'' command is
 151 replaced by the ``target'' output member.
 152
 153 @section System emulator devices
 154
 155 @subsection ivshmem (since 2.6.0)
 156
 157 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 158 or ``ivshmem-doorbell`` device types.
 159
 160 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
 161
 162 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
 163 should be used instead. That means that embedded 4xx PowerPC CPUs will not
 164 support page sizes < 4096 any longer.
 165
 166 @section System emulator machines
 167
 168 @subsection pc-0.10 and pc-0.11 (since 3.0)
 169
 170 These machine types are very old and likely can not be used for live migration
 171 from old QEMU versions anymore. A newer machine type should be used instead.
 172
 173 @subsection prep (PowerPC) (since 3.1)
 174
 175 This machine type uses an unmaintained firmware, broken in lots of ways,
 176 and unable to start post-2004 operating systems. 40p machine type should be
 177 used instead.
 178
 179 @section Device options
 180
 181 @subsection Block device options
 182
 183 @subsubsection "backing": "" (since 2.12.0)
 184
 185 In order to prevent QEMU from automatically opening an image's backing
 186 chain, use ``"backing": null'' instead.
 187
 188 @subsection vio-spapr-device device options
 189
 190 @subsubsection "irq": "" (since 3.0.0)
 191
 192 The ``irq'' property is obsoleted.