docs/about/removed-features.rst

10 --------------------------------------
12 ``-hdachs`` (removed in 2.12)
15 The geometry defined by ``-hdachs c,h,s,t`` should now be specified via
16 ``-device ide-hd,drive=dr,cyls=c,heads=h,secs=s,bios-chs-trans=t``
17 (together with ``-drive if=none,id=dr,...``).
19 ``-net channel`` (removed in 2.12)
22 This option has been replaced by ``-net user,guestfwd=...``.
24 ``-net dump`` (removed in 2.12)
27 ``-net dump[,vlan=n][,file=filename][,len=maxlen]`` has been replaced by
28 ``-object filter-dump,id=id,netdev=dev[,file=filename][,maxlen=maxlen]``.
31 ``-no-kvm-pit`` (removed in 2.12)
34 This was just a dummy option that has been ignored, since the in-kernel PIT
37 ``-M kernel_irqchip=split``.
39 ``-tdf`` (removed in 2.12)
42 There is no replacement, the ``-tdf`` option has just been ignored since the
43 behaviour that could be changed by this option in qemu-kvm is now the default
45 ``-global kvm-pit.lost_tick_policy=delay``.
47 ``-drive secs=s``, ``-drive heads=h`` & ``-drive cyls=c`` (removed in 3.0)
51 ``-device ...,drive=dr,cyls=c,heads=h,secs=s`` (together with
52 ``-drive if=none,id=dr,...``).
54 ``-drive serial=``, ``-drive trans=`` & ``-drive addr=`` (removed in 3.0)
57 Use ``-device ...,drive=dr,serial=r,bios-chs-trans=t,addr=a`` instead
58 (together with ``-drive if=none,id=dr,...``).
60 ``-net ...,vlan=x`` (removed in 3.0)
66 use ``-nic ...`` (e.g. for on-board NICs) or use ``-netdev ...,id=n`` together
67 with ``-device ...,netdev=n`` (for full control over pluggable NICs). To
69 vlan did), use ``-nic hubport,hubid=x,...`` or
70 ``-netdev hubport,id=n,hubid=x,...`` (with ``-device ...,netdev=n``) instead.
72 ``-no-kvm-irqchip`` (removed in 3.0)
75 Use ``-machine kernel_irqchip=off`` instead.
77 ``-no-kvm-pit-reinjection`` (removed in 3.0)
80 Use ``-global kvm-pit.lost_tick_policy=discard`` instead.
82 ``-balloon`` (removed in 3.1)
85 The ``-balloon virtio`` option has been replaced by ``-device virtio-balloon``.
86 The ``-balloon none`` option was a no-op and has no replacement.
88 ``-bootp`` (removed in 3.1)
91 The ``-bootp /some/file`` argument is replaced by either
92 ``-netdev user,id=x,bootp=/some/file`` (for pluggable NICs, accompanied with
93 ``-device ...,netdev=x``), or ``-nic user,bootp=/some/file`` (for on-board NICs).
96 ``-redir`` (removed in 3.1)
99 The ``-redir [tcp|udp]:hostport:[guestaddr]:guestport`` option is replaced
100 by either ``-netdev
101 user,id=x,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport``
102 (for pluggable NICs, accompanied with ``-device ...,netdev=x``) or by the option
103 ``-nic user,hostfwd=[tcp|udp]:[hostaddr]:hostport-[guestaddr]:guestport``
104 (for on-board NICs). The new syntax allows different settings to be provided
107 ``-smb`` (removed in 3.1)
110 The ``-smb /some/dir`` argument is replaced by either
111 ``-netdev user,id=x,smb=/some/dir`` (for pluggable NICs, accompanied with
112 ``-device ...,netdev=x``), or ``-nic user,smb=/some/dir`` (for on-board NICs).
115 ``-tftp`` (removed in 3.1)
118 The ``-tftp /some/dir`` argument is replaced by either
119 ``-netdev user,id=x,tftp=/some/dir`` (for pluggable NICs, accompanied with
120 ``-device ...,netdev=x``), or ``-nic user,tftp=/some/dir`` (for embedded NICs).
123 ``-localtime`` (removed in 3.1)
126 Replaced by ``-rtc base=localtime``.
128 ``-nodefconfig`` (removed in 3.1)
131 Use ``-no-user-config`` instead.
133 ``-rtc-td-hack`` (removed in 3.1)
136 Use ``-rtc driftfix=slew`` instead.
138 ``-startdate`` (removed in 3.1)
141 Replaced by ``-rtc base=date``.
143 ``-vnc ...,tls=...``, ``-vnc ...,x509=...`` & ``-vnc ...,x509verify=...`` (removed in 3.1)
146 The "tls-creds" option should be used instead to point to a "tls-creds-x509"
147 object created using "-object".
149 ``-mem-path`` fallback to RAM (removed in 5.0)
152 If guest RAM allocation from file pointed by ``mem-path`` failed,
154 in unpredictable behavior since the backing file specified by the user
156 specified with ``-mem-path`` can actually provide the guest RAM configured with
157 ``-m`` and QEMU fails to start up if RAM allocation is unsuccessful.
159 ``-net ...,name=...`` (removed in 5.1)
162 The ``name`` parameter of the ``-net`` option was a synonym
165 RISC-V firmware not booted by default (removed in 5.1)
168 QEMU 5.1 changes the default behaviour from ``-bios none`` to ``-bios default``
169 for the RISC-V ``virt`` machine and ``sifive_u`` machine.
171 ``-numa node,mem=...`` (removed in 5.1)
174 The parameter ``mem`` of ``-numa node`` was used to assign a part of guest RAM
182 with *memory-backend-ram* backend as replacement for parameter ``mem``
184 *memory-backend-file* backend to actually benefit from NUMA configuration.
186 work with old machine types. User can check the QAPI schema to see if the legacy
187 option is supported by looking at MachineInfo::numa-mem-supported property.
189 ``-numa`` node (without memory specified) (removed in 5.2)
193 parameter with the difference that the role of the user plays QEMU using
195 Use ``memdev`` with *memory-backend-ram* backend or ``mem`` (if
198 configure it explicitly using ``-numa node,memdev`` options. Current RAM
200 memory devices (pc|nv-dimm) are present use ``info memory-device`` and subtract
203 ``-smp`` (invalid topologies) (removed in 5.2)
212 Support for invalid topologies is removed, the user must ensure
213 topologies described with -smp include all possible cpus, i.e.
216 ``-machine enforce-config-section=on|off`` (removed in 5.2)
219 The ``enforce-config-section`` property was replaced by the
220 ``-global migration.send-configuration={on|off}`` option.
222 ``-no-kvm`` (removed in 5.2)
225 The ``-no-kvm`` argument was a synonym for setting ``-machine accel=tcg``.
227 ``-realtime`` (removed in 6.0)
230 The ``-realtime mlock=on|off`` argument has been replaced by the
231 ``-overcommit mem-lock=on|off`` argument.
233 ``-show-cursor`` option (removed in 6.0)
236 Use ``-display sdl,show-cursor=on``, ``-display gtk,show-cursor=on``
237 or ``-display default,show-cursor=on`` instead.
239 ``-tb-size`` option (removed in 6.0)
243 block cache, ``-accel tcg,tb-size=``.
245 ``-usbdevice audio`` (removed in 6.0)
249 Use ``-device usb-audio`` now instead (and specify a corresponding USB
250 host controller or ``-usb`` if necessary).
252 ``-vnc acl`` (removed in 6.0)
255 The ``acl`` option to the ``-vnc`` argument has been replaced
256 by the ``tls-authz`` and ``sasl-authz`` options.
258 ``-mon ...,control=readline,pretty=on|off`` (removed in 6.0)
264 ``-drive file=json:{...{'driver':'file'}}`` (removed in 6.0)
274 Use ``-device floppy,...`` instead.  When configuring onboard floppy
278     -global isa-fdc.driveA=...
279     -global sysbus-fdc.driveA=...
280     -global SUNW,fdtwo.drive=...
285     -device floppy,unit=0,drive=...
290     -global isa-fdc.driveB=...
291     -global sysbus-fdc.driveB=...
296     -device floppy,unit=1,drive=...
301     -device isa-fdc,...,driveA=...
306     -device isa-fdc,...
307     -device floppy,unit=0,drive=...
312     -device isa-fdc,...,driveB=...
317     -device isa-fdc,...
318     -device floppy,unit=1,drive=...
320 ``-drive`` with bogus interface type (removed in 6.0)
325 -device.  Use ``if=none`` instead.
327 ``-usbdevice ccid`` (removed in 6.0)
331 Use ``-device usb-ccid`` instead.
333 ``-no-quit`` (removed in 7.0)
336 The ``-no-quit`` was a synonym for ``-display ...,window-close=off`` which
339 ``--enable-fips`` (removed in 7.1)
348 Neither the ``nettle`` library, or the built-in cryptography provider are
351 ``-writeconfig`` (removed in 7.1)
354 The ``-writeconfig`` option was not able to serialize the entire contents
361 The ``loaded=on`` option in the command line or QMP ``object-add`` either had
366 ``opened`` property of ``rng-*`` objects (removed in 7.1)
369 The ``opened=on`` option in the command line or QMP ``object-add`` either had
373 ``-display sdl,window_close=...`` (removed in 7.1)
376 Use ``-display sdl,window-close=...`` instead (i.e. with a minus instead of
379 ``-alt-grab`` and ``-display sdl,alt_grab=on`` (removed in 7.1)
382 Use ``-display sdl,grab-mod=lshift-lctrl-lalt`` instead.
384 ``-ctrl-grab`` and ``-display sdl,ctrl_grab=on`` (removed in 7.1)
387 Use ``-display sdl,grab-mod=rctrl`` instead.
389 ``-sdl`` (removed in 7.1)
392 Use ``-display sdl`` instead.
394 ``-curses`` (removed in 7.1)
397 Use ``-display curses`` instead.
399 Creating sound card devices using ``-soundhw`` (removed in 7.1)
402 Sound card devices should be created using ``-device`` or ``-audio``.
403 The exception is ``pcspk`` which can be activated using ``-machine
404 pcspk-audiodev=<name>``.
406 ``-watchdog`` (removed in 7.2)
409 Use ``-device`` instead.
419 ``-chardev`` backend aliases ``tty`` and ``parport`` (removed in 8.0)
425 ``-drive if=none`` for the sifive_u OTP device (removed in 8.0)
428 Use ``-drive if=pflash`` to configure the OTP device of the sifive_u
429 RISC-V machine instead.
431 ``-spice password=string`` (removed in 8.0)
435 the process listing. This was replaced by the new ``password-secret``
439 ``QEMU_AUDIO_`` environment variables and ``-audio-help`` (removed in 8.2)
442 The ``-audiodev`` and ``-audio`` command line options are now the only
445 Using ``-audiodev`` to define the default audio backend (removed in 8.2)
449 first ``-audiodev`` command line option as a fallback.  Starting with
450 version 8.2, audio backends created with ``-audiodev`` will only be
454 In order to configure a default audio backend, use the ``-audio``
461 line if the ``-nodefaults`` options is used.
463 ``-no-hpet`` (removed in 9.0)
467 Use ``-machine hpet=off`` instead.
469 ``-no-acpi`` (removed in 9.0)
472 The ``-no-acpi`` setting has been turned into a machine property.
473 Use ``-machine acpi=off`` instead.
475 ``-async-teardown`` (removed in 9.0)
478 Use ``-run-with async-teardown=on`` instead.
480 ``-chroot`` (removed in 9.0)
483 Use ``-run-with chroot=dir`` instead.
485 ``-singlestep`` (removed in 9.0)
488 The ``-singlestep`` option has been turned into an accelerator property,
490 Use ``-accel tcg,one-insn-per-tb=on`` instead.
492 ``-smp`` ("parameter=0" SMP configurations) (removed in 9.0)
503 cause unexpected results in the -smp parsing. So support for this kind of
504 configurations (e.g. -smp 8,sockets=0) is removed since 9.0, users have
505 to ensure that all the topology members described with -smp are greater
508 ``-global migration.decompress-error-check`` (removed in 9.1)
513 ``-device virtio-blk,scsi=on|off`` (removed in 9.1)
516 The virtio-blk SCSI passthrough feature is a legacy VIRTIO feature.  VIRTIO 1.0
517 and later do not support it because the virtio-scsi device was introduced for
518 full SCSI support.  Use virtio-scsi instead when SCSI passthrough is required.
520 ``-fsdev proxy`` and ``-virtfs proxy`` (removed in 9.2)
525 server (QEMU process) over to a separate process (the virtfs-proxy-helper
535 ``-portrait`` and ``-rotate`` (removed in 9.2)
538 The ``-portrait`` and ``-rotate`` options were documented as only
544 rotated by the user, and had three effects:
551 Of these three things, the input-rotation was coded without being
552 restricted to boards which supported the full set of device-rotation
558 ``-runas`` (removed in 10.0)
561 Use ``-run-with user=..`` instead.
564 User-mode emulator command line arguments
565 -----------------------------------------
567 ``-singlestep`` (removed in 9.0)
570 The ``-singlestep`` option has been given a name that better reflects
571 what it actually does. For both linux-user and bsd-user, use the
572 ``-one-insn-per-tb`` option instead.
576 ------------------------------------
578 ``block-dirty-bitmap-add`` "autoload" parameter (removed in 4.2)
584 ``cpu-add`` (removed in 5.2)
587 Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``.  See
588 documentation of ``query-hotpluggable-cpus`` for additional details.
593 Use ``blockdev-change-medium`` or ``change-vnc-password`` or
594 ``display-update`` instead.
596 ``query-events`` (removed in 6.0)
599 The ``query-events`` command has been superseded by the more powerful
600 and accurate ``query-qmp-schema`` command.
602 ``migrate_set_cache_size`` and ``query-migrate-cache-size`` (removed in 6.0)
612 ``query-cpus`` (removed in 6.0)
615 The ``query-cpus`` command is replaced by the ``query-cpus-fast`` command.
617 ``query-cpus-fast`` ``arch`` output member (removed in 6.0)
620 The ``arch`` output member of the ``query-cpus-fast`` command is
627 the 'wait' field, which is only applicable to sockets in server mode
629 ``query-named-block-nodes`` result ``encryption_key_missing`` (removed in 6.0)
634 ``query-block`` result ``inserted.encryption_key_missing`` (removed in 6.0)
639 ``query-named-block-nodes`` and ``query-block`` result dirty-bitmaps[i].status (removed in 6.0)
646 ``query-block`` result field ``dirty-bitmaps`` (removed in 6.0)
649 The ``dirty-bitmaps`` field of the ``BlockInfo`` structure, returned by
650 the query-block command is itself now removed. The ``dirty-bitmaps``
652 type of the ``inserted`` field in query-block replies, as well as the
653 type of array items in query-named-block-nodes.
655 ``object-add`` option ``props`` (removed in 6.0)
658 Specify the properties for the object as top-level arguments instead.
660 ``query-sgx`` return value member ``section-size`` (removed in 8.0)
663 Member ``section-size`` in the return value of ``query-sgx``
667 ``query-sgx-capabilities`` return value member ``section-size`` (removed in 8.0)
670 Member ``section-size`` in the return value of ``query-sgx-capabilities``
673 ``query-migrate`` return value member ``skipped`` (removed in 9.1)
682 Use blockdev-mirror with NBD instead. See "QMP invocation for live
683 storage migration with ``blockdev-mirror`` + NBD" in
684 docs/interop/live-block-operations.rst for a detailed explanation.
689 Use blockdev-mirror with NBD instead. See "QMP invocation for live
690 storage migration with ``blockdev-mirror`` + NBD" in
691 docs/interop/live-block-operations.rst for a detailed explanation.
693 ``migrate-set-capabilities`` ``block`` option (removed in 9.1)
697 invocation for live storage migration with ``blockdev-mirror`` + NBD"
698 in docs/interop/live-block-operations.rst.
700 ``migrate-set-parameter`` ``compress-level`` option (removed in 9.1)
703 Use ``multifd-zlib-level`` or ``multifd-zstd-level`` instead.
705 ``migrate-set-parameter`` ``compress-threads`` option (removed in 9.1)
708 Use ``multifd-channels`` instead.
710 ``migrate-set-parameter`` ``compress-wait-thread`` option (removed in 9.1)
715 ``migrate-set-parameter`` ``decompress-threads`` option (removed in 9.1)
718 Use ``multifd-channels`` instead.
720 ``migrate-set-capability`` ``compress`` option (removed in 9.1)
723 Use ``multifd-compression`` instead.
735 ----------------------------------
745 The ability to instrument QEMU helper functions with vCPU-aware trace
750 -------------------------------------
769 ``cpu-add`` (removed in 5.2)
772 Use ``device_add`` for hotplugging vCPUs instead of ``cpu-add``.  See
773 documentation of ``query-hotpluggable-cpus`` for additional details.
788 ``migrate-set-cache-size`` and ``info migrate-cache-size`` (removed in 6.0)
791 Use ``migrate-set-parameters`` and ``info migrate-parameters`` instead.
796 Use ``migrate-set-parameters`` instead.
806 The ``singlestep`` command has been replaced by the ``one-insn-per-tb``
809 ``migrate`` command ``-i`` option (removed in 9.1)
812 Use blockdev-mirror with NBD instead. See "QMP invocation for live
813 storage migration with ``blockdev-mirror`` + NBD" in
814 docs/interop/live-block-operations.rst for a detailed explanation.
816 ``migrate`` command ``-b`` option (removed in 9.1)
819 Use blockdev-mirror with NBD instead. See "QMP invocation for live
820 storage migration with ``blockdev-mirror`` + NBD" in
821 docs/interop/live-block-operations.rst for a detailed explanation.
827 invocation for live storage migration with ``blockdev-mirror`` + NBD"
828 in docs/interop/live-block-operations.rst.
830 ``migrate_set_parameter`` ``compress-level`` option (removed in 9.1)
833 Use ``multifd-zlib-level`` or ``multifd-zstd-level`` instead.
835 ``migrate_set_parameter`` ``compress-threads`` option (removed in 9.1)
838 Use ``multifd-channels`` instead.
840 ``migrate_set_parameter`` ``compress-wait-thread`` option (removed in 9.1)
845 ``migrate_set_parameter`` ``decompress-threads`` option (removed in 9.1)
848 Use ``multifd-channels`` instead.
853 Use ``multifd-compression`` instead.
856 ------------------
858 System emulation on 32-bit Windows hosts (removed in 9.0)
861 Windows 11 has no support for 32-bit host installs, and Windows 10 did
862 not support new 32-bit installs, only upgrades. 32-bit Windows support
864 and dropping support for 32-bit x86 host deployments in
865 general. 32-bit Windows is therefore no longer a supported host for
867 capable of the 64-bit x86 extensions, a corresponding 64-bit OS should
870 32-bit hosts for 64-bit guests (removed in 10.0)
873 In general, 32-bit hosts cannot support the memory space or atomicity
874 requirements of 64-bit guests.  Prior to 10.0, QEMU attempted to
876 in a single thread context; in user mode atomicity was simply broken.
877 From 10.0, QEMU has disabled configuration of 64-bit guests on 32-bit hosts.
880 -------------------
882 RISC-V ISA privilege specification version 1.09.1 (removed in 5.1)
885 The RISC-V ISA privilege specification version 1.09.1 has been removed.
890 --------------------
892 KVM guest support on 32-bit Arm hosts (removed in 5.2)
895 The Linux kernel has dropped support for allowing 32-bit Arm systems
897 as well.  Running 32-bit guests on a 64-bit Arm host remains supported.
899 RISC-V ISA Specific CPUs (removed in 5.1)
902 The RISC-V cpus with the ISA version in the CPU name have been removed. The
903 four CPUs are: ``rv32gcsu-v1.9.1``, ``rv32gcsu-v1.10.0``, ``rv64gcsu-v1.9.1`` and
904 ``rv64gcsu-v1.10.0``. Instead the version can be specified via the CPU ``priv_spec``
907 RISC-V no MMU CPUs (removed in 5.1)
910 The RISC-V no MMU cpus have been removed. The two CPUs: ``rv32imacu-nommu`` and
911 ``rv64imacu-nommu`` can no longer be used. Instead the MMU status can be specified
914 ``compat`` property of server class POWER CPUs (removed in 6.0)
917 The ``max-cpu-compat`` property of the ``pseries`` machine type should be used
930 The only public user of this architecture was the milkymist project,
941 x86 ``Icelake-Client`` CPU (removed in 7.1)
945 Use ``Icelake-Server`` instead.
958 ``check-tcg`` tests.
960 RISC-V 'any' CPU type ``-cpu any`` (removed in 9.2)
964 initial RISC-V QEMU port. Its usage was always been unclear: users don't know
969 -------------------
974 ``-M kernel-irqchip=off`` cannot be used on KVM if the CPU model includes
975 a local APIC.  The ``split`` setting is supported, as is using ``-M
976 kernel-irqchip=off`` when the CPU does not have a local APIC.
978 MIPS "Trap-and-Emulate" KVM support (removed in 8.0)
981 The MIPS "Trap-and-Emulate" KVM host and guest support was removed
984 HAXM (``-accel hax``) (removed in 8.2)
991 ------------------------
1000 ``s390-virtio`` (removed in 2.6)
1003 Use the ``s390-ccw-virtio`` machine instead.
1010 ``xlnx-ep108`` (removed in 3.0)
1014 Use the ``xlnx-zcu102`` machine instead.
1020 generic ``spike`` machine. If you need to specify an older version of the RISC-V
1021 spec you can use the ``-cpu rv64gcsu,priv_spec=v1.10.0`` command line argument.
1041 Aspeed ``swift-bmc`` machine (removed in 7.0)
1045 OpenPOWER machines are ``witherspoon-bmc`` and ``romulus-bmc``.
1053 Nios II ``10m50-ghrd`` and ``nios2-generic-nommu`` machines (removed in 9.1)
1077 Aspeed ``tacoma-bmc`` machine (removed in 10.0)
1080 The ``tacoma-bmc`` machine was removed because it didn't bring much
1081 compared to the ``rainier-bmc`` machine. Also, the ``tacoma-bmc`` was
1083 labs. It can be easily replaced by the ``rainier-bmc`` machine, which
1084 was the actual final product, or by the ``ast2600-evb`` with some
1092 U-Boot in 2017, and Linux in 2024.
1094 Big-Endian variants of ``petalogix-ml605`` and ``xlnx-zynqmp-pmu`` machines (removed in 10.1)
1097 Both the MicroBlaze ``petalogix-ml605`` and ``xlnx-zynqmp-pmu`` machines
1100 only available as little-endian machines.
1103 linux-user mode CPUs
1104 --------------------
1110 only implemented in linux-user mode, but support for this CPU was removed from
1129 --------------------------
1131 TCG trace-events (removed in 7.0)
1136 any user is currently using this feature and needs help with
1137 converting to using TCG plugins they should contact the qemu-devel
1142 -----------------------
1144 ``spapr-pci-vfio-host-bridge`` (removed in 2.12)
1147 The ``spapr-pci-vfio-host-bridge`` device type has been replaced by the
1148 ``spapr-pci-host-bridge`` device type.
1153 Replaced by either the ``ivshmem-plain`` or ``ivshmem-doorbell``.
1155 ``ide-drive`` (removed in 6.0)
1158 The 'ide-drive' device has been removed. Users should use 'ide-hd' or
1159 'ide-cd' as appropriate to get an IDE hard disk or CD-ROM as needed.
1161 ``scsi-disk`` (removed in 6.0)
1164 The 'scsi-disk' device has been removed. Users should use 'scsi-hd' or
1165 'scsi-cd' as appropriate to get a SCSI hard disk or CD-ROM as needed.
1174 by using ``-machine graphics=off``.
1182 ----------------
1184 ``qemu-nbd --partition`` (removed in 5.0)
1187 The ``qemu-nbd --partition $digit`` code (also spelled ``-P``)
1190 done by utilizing the ``--image-opts`` option with a raw blockdev
1195   qemu-nbd -t -P 1 -f qcow2 file.qcow2
1199 …qemu-nbd -t --image-opts driver=raw,offset=1M,size=100M,file.driver=qcow2,file.file.driver=file,fi…
1201 ``qemu-img convert -n -o`` (removed in 5.1)
1204 All options specified in ``-o`` are image creation options, so
1205 they are now rejected when used with ``-n`` to skip image creation.
1208 ``qemu-img create -b bad file $size`` (removed in 5.1)
1212 ``qemu-img create`` used to issue a warning about the failure but
1214 However, as the ``-u`` option exists for this purpose, it is safer to
1217 error when ``-u`` is not used.
1219 ``qemu-img amend`` to adjust backing file (removed in 6.1)
1222 The use of ``qemu-img amend`` to modify the name or format of a qcow2
1227 backing chain should be performed with ``qemu-img rebase -u`` either
1231 ``qemu-img`` backing file without format (removed in 6.1)
1234 The use of ``qemu-img create``, ``qemu-img rebase``, or ``qemu-img
1240 probe sees a non-raw image based on guest writes.
1242 To avoid creating unsafe backing chains, you must pass ``-o
1243 backing_fmt=`` (or the shorthand ``-F`` during create) to specify the
1244 intended backing format.  You may use ``qemu-img rebase -u`` to
1247 ``qemu-img info`` to probe the format of an untrusted backing image,
1251 -------------
1261 The corresponding upstream server project is no longer maintained.
1266 -----
1272 ``https://gitlab.com/virtio-fs/virtiofsd``; this has been
1278 ----------------
1280 ``--blacklist`` command line option (removed in 9.1)
1283 ``--blacklist`` has been replaced by ``--block-rpcs`` (which is a better
1284 wording for what this option does). The short form ``-b`` still stays
1291 The ``blacklist`` config file option has been renamed to ``block-rpcs``
1295 …tel.com/content/www/us/en/content-details/781327/intel-is-discontinuing-ip-ordering-codes-listed-i…