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 -balloon (since 2.12.0)
  90
  91 The @option{--balloon virtio} argument has been superseded by
  92 @option{--device virtio-balloon}.
  93
  94 @subsection -fsdev handle (since 2.12.0)
  95
  96 The ``handle'' fsdev backend does not support symlinks and causes the 9p
  97 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
  98 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
  99 which is not the recommended way to run QEMU. This backend should not be
 100 used and it will be removed with no replacement.
 101
 102 @subsection -no-frame (since 2.12.0)
 103
 104 The @code{--no-frame} argument works with SDL 1.2 only. The other user
 105 interfaces never implemented this in the first place. So this will be
 106 removed together with SDL 1.2 support.
 107
 108 @subsection -rtc-td-hack (since 2.12.0)
 109
 110 The @code{-rtc-td-hack} option has been replaced by
 111 @code{-rtc driftfix=slew}.
 112
 113 @subsection -localtime (since 2.12.0)
 114
 115 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 116
 117 @subsection -startdate (since 2.12.0)
 118
 119 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 120
 121 @subsection -virtioconsole (since 3.0.0)
 122
 123 Option @option{-virtioconsole} has been replaced by
 124 @option{-device virtconsole}.
 125
 126 @subsection -clock (since 3.0.0)
 127
 128 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
 129 replacement since it is not needed anymore.
 130
 131 @subsection -enable-hax (since 3.0.0)
 132
 133 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
 134 Both options have been introduced in QEMU version 2.9.0.
 135
 136 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
 137
 138 The 'file' driver for drives is no longer appropriate for character or host
 139 devices and will only accept regular files (S_IFREG). The correct driver
 140 for these file types is 'host_cdrom' or 'host_device' as appropriate.
 141
 142 @section QEMU Machine Protocol (QMP) commands
 143
 144 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
 145
 146 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 147 from qcow2 images.
 148
 149 @subsection query-cpus (since 2.12.0)
 150
 151 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 152
 153 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 154
 155 The ``arch'' output member of the ``query-cpus-fast'' command is
 156 replaced by the ``target'' output member.
 157
 158 @section System emulator devices
 159
 160 @subsection ivshmem (since 2.6.0)
 161
 162 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 163 or ``ivshmem-doorbell`` device types.
 164
 165 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
 166
 167 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
 168 should be used instead. That means that embedded 4xx PowerPC CPUs will not
 169 support page sizes < 4096 any longer.
 170
 171 @section System emulator machines
 172
 173 @subsection pc-0.10 and pc-0.11 (since 3.0)
 174
 175 These machine types are very old and likely can not be used for live migration
 176 from old QEMU versions anymore. A newer machine type should be used instead.
 177
 178 @subsection prep (PowerPC) (since 3.1)
 179
 180 This machine type uses an unmaintained firmware, broken in lots of ways,
 181 and unable to start post-2004 operating systems. 40p machine type should be
 182 used instead.
 183
 184 @section Device options
 185
 186 @subsection Block device options
 187
 188 @subsubsection "backing": "" (since 2.12.0)
 189
 190 In order to prevent QEMU from automatically opening an image's backing
 191 chain, use ``"backing": null'' instead.
 192
 193 @subsection vio-spapr-device device options
 194
 195 @subsubsection "irq": "" (since 3.0.0)
 196
 197 The ``irq'' property is obsoleted.