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 -fsdev handle (since 2.12.0)
  86
  87 The ``handle'' fsdev backend does not support symlinks and causes the 9p
  88 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
  89 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
  90 which is not the recommended way to run QEMU. This backend should not be
  91 used and it will be removed with no replacement.
  92
  93 @subsection -no-frame (since 2.12.0)
  94
  95 The @code{--no-frame} argument works with SDL 1.2 only. The other user
  96 interfaces never implemented this in the first place. So this will be
  97 removed together with SDL 1.2 support.
  98
  99 @subsection -rtc-td-hack (since 2.12.0)
 100
 101 The @code{-rtc-td-hack} option has been replaced by
 102 @code{-rtc driftfix=slew}.
 103
 104 @subsection -localtime (since 2.12.0)
 105
 106 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 107
 108 @subsection -startdate (since 2.12.0)
 109
 110 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 111
 112 @subsection -virtioconsole (since 3.0.0)
 113
 114 Option @option{-virtioconsole} has been replaced by
 115 @option{-device virtconsole}.
 116
 117 @subsection -clock (since 3.0.0)
 118
 119 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
 120 replacement since it is not needed anymore.
 121
 122 @subsection -enable-hax (since 3.0.0)
 123
 124 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
 125 Both options have been introduced in QEMU version 2.9.0.
 126
 127 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
 128
 129 The 'file' driver for drives is no longer appropriate for character or host
 130 devices and will only accept regular files (S_IFREG). The correct driver
 131 for these file types is 'host_cdrom' or 'host_device' as appropriate.
 132
 133 @section QEMU Machine Protocol (QMP) commands
 134
 135 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
 136
 137 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 138 from qcow2 images.
 139
 140 @subsection query-cpus (since 2.12.0)
 141
 142 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 143
 144 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 145
 146 The ``arch'' output member of the ``query-cpus-fast'' command is
 147 replaced by the ``target'' output member.
 148
 149 @section System emulator devices
 150
 151 @subsection ivshmem (since 2.6.0)
 152
 153 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 154 or ``ivshmem-doorbell`` device types.
 155
 156 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
 157
 158 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
 159 should be used instead. That means that embedded 4xx PowerPC CPUs will not
 160 support page sizes < 4096 any longer.
 161
 162 @section System emulator machines
 163
 164 @subsection pc-0.10 and pc-0.11 (since 3.0)
 165
 166 These machine types are very old and likely can not be used for live migration
 167 from old QEMU versions anymore. A newer machine type should be used instead.
 168
 169 @subsection prep (PowerPC) (since 3.1)
 170
 171 This machine type uses an unmaintained firmware, broken in lots of ways,
 172 and unable to start post-2004 operating systems. 40p machine type should be
 173 used instead.
 174
 175 @section Device options
 176
 177 @subsection Block device options
 178
 179 @subsubsection "backing": "" (since 2.12.0)
 180
 181 In order to prevent QEMU from automatically opening an image's backing
 182 chain, use ``"backing": null'' instead.
 183
 184 @subsection vio-spapr-device device options
 185
 186 @subsubsection "irq": "" (since 3.0.0)
 187
 188 The ``irq'' property is obsoleted.