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 -vnc tls (since 2.5.0)
  44
  45 The ``-vnc tls'' argument is now a synonym for setting
  46 ``-object tls-creds-anon,id=tls0'' combined with
  47 ``-vnc tls-creds=tls0'
  48
  49 @subsection -vnc x509 (since 2.5.0)
  50
  51 The ``-vnc x509=/path/to/certs'' argument is now a
  52 synonym for setting
  53 ``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=no''
  54 combined with ``-vnc tls-creds=tls0'
  55
  56 @subsection -vnc x509verify (since 2.5.0)
  57
  58 The ``-vnc x509verify=/path/to/certs'' argument is now a
  59 synonym for setting
  60 ``-object tls-creds-x509,dir=/path/to/certs,id=tls0,verify-peer=yes''
  61 combined with ``-vnc tls-creds=tls0'
  62
  63 @subsection -tftp (since 2.6.0)
  64
  65 The ``-tftp /some/dir'' argument is replaced by either
  66 ``-netdev user,id=x,tftp=/some/dir '' (for pluggable NICs, accompanied
  67 with ``-device ...,netdev=x''), or ``-nic user,tftp=/some/dir''
  68 (for embedded NICs). The new syntax allows different settings to be
  69 provided per NIC.
  70
  71 @subsection -bootp (since 2.6.0)
  72
  73 The ``-bootp /some/file'' argument is replaced by either
  74 ``-netdev user,id=x,bootp=/some/file '' (for pluggable NICs, accompanied
  75 with ``-device ...,netdev=x''), or ``-nic user,bootp=/some/file''
  76 (for embedded NICs). The new syntax allows different settings to be
  77 provided per NIC.
  78
  79 @subsection -redir (since 2.6.0)
  80
  81 The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport'' argument is
  82 replaced by either
  83 ``-netdev user,id=x,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
  84 (for pluggable NICs, accompanied with ``-device ...,netdev=x'') or
  85 ``-nic user,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport''
  86 (for embedded NICs). The new syntax allows different settings to be
  87 provided per NIC.
  88
  89 @subsection -smb (since 2.6.0)
  90
  91 The ``-smb /some/dir'' argument is replaced by either
  92 ``-netdev user,id=x,smb=/some/dir '' (for pluggable NICs, accompanied
  93 with ``-device ...,netdev=x''), or ``-nic user,smb=/some/dir''
  94 (for embedded NICs). The new syntax allows different settings to be
  95 provided per NIC.
  96
  97 @subsection -usbdevice (since 2.10.0)
  98
  99 The ``-usbdevice DEV'' argument is now a synonym for setting
 100 the ``-device usb-DEV'' argument instead. The deprecated syntax
 101 would automatically enable USB support on the machine type.
 102 If using the new syntax, USB support must be explicitly
 103 enabled via the ``-machine usb=on'' argument.
 104
 105 @subsection -nodefconfig (since 2.11.0)
 106
 107 The ``-nodefconfig`` argument is a synonym for ``-no-user-config``.
 108
 109 @subsection -balloon (since 2.12.0)
 110
 111 The @option{--balloon virtio} argument has been superseded by
 112 @option{--device virtio-balloon}.
 113
 114 @subsection -machine s390-squash-mcss=on|off (since 2.12.0)
 115
 116 The ``s390-squash-mcss=on`` property has been obsoleted by allowing the
 117 cssid to be chosen freely. Instead of squashing subchannels into the
 118 default channel subsystem image for guests that do not support multiple
 119 channel subsystems, all devices can be put into the default channel
 120 subsystem image.
 121
 122 @subsection -fsdev handle (since 2.12.0)
 123
 124 The ``handle'' fsdev backend does not support symlinks and causes the 9p
 125 filesystem in the guest to fail a fair amount of tests from the PJD POSIX
 126 filesystem test suite. Also it requires the CAP_DAC_READ_SEARCH capability,
 127 which is not the recommended way to run QEMU. This backend should not be
 128 used and it will be removed with no replacement.
 129
 130 @subsection -no-frame (since 2.12.0)
 131
 132 The @code{--no-frame} argument works with SDL 1.2 only. The other user
 133 interfaces never implemented this in the first place. So this will be
 134 removed together with SDL 1.2 support.
 135
 136 @subsection -rtc-td-hack (since 2.12.0)
 137
 138 The @code{-rtc-td-hack} option has been replaced by
 139 @code{-rtc driftfix=slew}.
 140
 141 @subsection -localtime (since 2.12.0)
 142
 143 The @code{-localtime} option has been replaced by @code{-rtc base=localtime}.
 144
 145 @subsection -startdate (since 2.12.0)
 146
 147 The @code{-startdate} option has been replaced by @code{-rtc base=@var{date}}.
 148
 149 @subsection -virtioconsole (since 3.0.0)
 150
 151 Option @option{-virtioconsole} has been replaced by
 152 @option{-device virtconsole}.
 153
 154 @subsection -clock (since 3.0.0)
 155
 156 The @code{-clock} option is ignored since QEMU version 1.7.0. There is no
 157 replacement since it is not needed anymore.
 158
 159 @subsection -enable-hax (since 3.0.0)
 160
 161 The @option{-enable-hax} option has been replaced by @option{-accel hax}.
 162 Both options have been introduced in QEMU version 2.9.0.
 163
 164 @subsection -drive file=json:@{...@{'driver':'file'@}@} (since 3.0)
 165
 166 The 'file' driver for drives is no longer appropriate for character or host
 167 devices and will only accept regular files (S_IFREG). The correct driver
 168 for these file types is 'host_cdrom' or 'host_device' as appropriate.
 169
 170 @section QEMU Machine Protocol (QMP) commands
 171
 172 @subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)
 173
 174 "autoload" parameter is now ignored. All bitmaps are automatically loaded
 175 from qcow2 images.
 176
 177 @subsection query-cpus (since 2.12.0)
 178
 179 The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 180
 181 @subsection query-cpus-fast "arch" output member (since 3.0.0)
 182
 183 The ``arch'' output member of the ``query-cpus-fast'' command is
 184 replaced by the ``target'' output member.
 185
 186 @section System emulator devices
 187
 188 @subsection ivshmem (since 2.6.0)
 189
 190 The ``ivshmem'' device type is replaced by either the ``ivshmem-plain''
 191 or ``ivshmem-doorbell`` device types.
 192
 193 @subsection Page size support < 4k for embedded PowerPC CPUs (since 2.12.0)
 194
 195 qemu-system-ppcemb will be removed. qemu-system-ppc (or qemu-system-ppc64)
 196 should be used instead. That means that embedded 4xx PowerPC CPUs will not
 197 support page sizes < 4096 any longer.
 198
 199 @section System emulator machines
 200
 201 @subsection pc-0.10 and pc-0.11 (since 3.0)
 202
 203 These machine types are very old and likely can not be used for live migration
 204 from old QEMU versions anymore. A newer machine type should be used instead.
 205
 206 @section Device options
 207
 208 @subsection Block device options
 209
 210 @subsubsection "backing": "" (since 2.12.0)
 211
 212 In order to prevent QEMU from automatically opening an image's backing
 213 chain, use ``"backing": null'' instead.
 214
 215 @subsection vio-spapr-device device options
 216
 217 @subsubsection "irq": "" (since 3.0.0)
 218
 219 The ``irq'' property is obsoleted.