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2021-02-08Merge remote-tracking branch ↵Peter Maydell
'remotes/dgilbert/tags/pull-migration-20210208a' into staging Migration pull 2021-02-08 v2 Dropped vmstate: Fix memory leak in vmstate_handle_alloc Broke on Power Added migration: only check page size match if RAM postcopy is enabled # gpg: Signature made Mon 08 Feb 2021 11:28:14 GMT # gpg: using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7 # gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full] # Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A 9FA9 0516 331E BC5B FDE7 * remotes/dgilbert/tags/pull-migration-20210208a: (27 commits) migration: only check page size match if RAM postcopy is enabled migration: introduce snapshot-{save, load, delete} QMP commands iotests: fix loading of common.config from tests/ subdir iotests: add support for capturing and matching QMP events migration: introduce a delete_snapshot wrapper migration: wire up support for snapshot device selection migration: control whether snapshots are ovewritten block: rename and alter bdrv_all_find_snapshot semantics block: allow specifying name of block device for vmstate storage block: add ability to specify list of blockdevs during snapshot migration: stop returning errno from load_snapshot() migration: Make save_snapshot() return bool, not 0/-1 block: push error reporting into bdrv_all_*_snapshot functions migration: Display the migration blockers migration: Add blocker information migration: Fix a few absurdly defective error messages migration: Fix cache_init()'s "Failed to allocate" error messages migration: Clean up signed vs. unsigned XBZRLE cache-size migration: Fix migrate-set-parameters argument validation migration: introduce 'userfaultfd-wrlat.py' script ... Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2021-02-08migration: wire up support for snapshot device selectionDaniel P. Berrangé
Modify load_snapshot/save_snapshot to accept the device list and vmstate node name parameters previously added to the block layer. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20210204124834.774401-9-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08migration: stop returning errno from load_snapshot()Daniel P. Berrangé
None of the callers care about the errno value since there is a full Error object populated. This gives consistency with save_snapshot() which already just returns a boolean value. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> [PMD: Return false/true instead of -1/0, document function] Acked-by: Pavel Dovgalyuk <pavel.dovgalyuk@ispras.ru> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20210204124834.774401-4-berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2021-02-08confidential guest support: Introduce cgs "ready" flagDavid Gibson
The platform specific details of mechanisms for implementing confidential guest support may require setup at various points during initialization. Thus, it's not really feasible to have a single cgs initialization hook, but instead each mechanism needs its own initialization calls in arch or machine specific code. However, to make it harder to have a bug where a mechanism isn't properly initialized under some circumstances, we want to have a common place, late in boot, where we verify that cgs has been initialized if it was requested. This patch introduces a ready flag to the ConfidentialGuestSupport base type to accomplish this, which we verify in qemu_machine_creation_done(). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org>
2021-02-08qom: Allow optional sugar propsGreg Kurz
Global properties have an @optional field, which allows to apply a given property to a given type even if one of its subclasses doesn't support it. This is especially used in the compat code when dealing with the "disable-modern" and "disable-legacy" properties and the "virtio-pci" type. Allow object_register_sugar_prop() to set this field as well. Signed-off-by: Greg Kurz <groug@kaod.org> Message-Id: <159738953558.377274.16617742952571083440.stgit@bahia.lan> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
2021-02-05accel: replace struct CpusAccel with AccelOpsClassClaudio Fontana
This will allow us to centralize the registration of the cpus.c module accelerator operations (in accel/accel-softmmu.c), and trigger it automatically using object hierarchy lookup from the new accel_init_interfaces() initialization step, depending just on which accelerators are available in the code. Rename all tcg-cpus.c, kvm-cpus.c, etc to tcg-accel-ops.c, kvm-accel-ops.c, etc, matching the object type names. Signed-off-by: Claudio Fontana <cfontana@suse.de> Message-Id: <20210204163931.7358-18-cfontana@suse.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-02-05accel: extend AccelState and AccelClass to user-modeClaudio Fontana
Signed-off-by: Claudio Fontana <cfontana@suse.de> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> [claudio: rebased on Richard's splitwx work] Signed-off-by: Claudio Fontana <cfontana@suse.de> Message-Id: <20210204163931.7358-17-cfontana@suse.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2021-02-01error: rename error_with_timestamp to message_with_timestampStefan Hajnoczi
The -msg timestamp=on|off option controls whether a timestamp is printed with error_report() messages. The "-msg" name suggests that this option has a wider effect than just error_report(). The next patch extends it to the 'log' trace backend, so rename the variable from error_with_timestamp to message_with_timestamp. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: BALATON Zoltan <balaton@eik.bme.hu> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-id: 20210125113507.224287-2-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2021-01-23vnc: support "-vnc help"Paolo Bonzini
Use qemu_opts_parse_noisily now that HMP does not call vnc_parse anymore. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Gerd Hoffmann <kraxel@redhat.com> Message-Id: <20210120144235.345983-4-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-01-21runstate: cleanup reboot and panic actionsPaolo Bonzini
The possible choices for panic, reset and watchdog actions are inconsistent. "-action panic=poweroff" should be renamed to "-action panic=shutdown" on the command line. This is because "-action panic=poweroff" and "-action watchdog=poweroff" have slightly different semantics, the first does an unorderly exit while the second goes through qemu_cleanup(). With this change, -no-shutdown would not have to change "-action panic=pause" "pause", just like it does not have to change the reset action. "-action reboot=none" should be renamed to "-action reboot=reset". This should be self explanatory, since for example "-action panic=none" lets the guest proceed without taking any action. Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-01-02vl: initialize displays _after_ exiting preconfigurationPaolo Bonzini
Due to the renumbering of text consoles when graphical consoles are created, init_displaystate must be called after all QemuConsoles are created, i.e. after devices are created. vl.c calls it from qemu_init_displays, while qmp_x_exit_preconfig is where devices are created. If qemu_init_displays is called before it, the VGA graphical console does not come up. Reported-by: Howard Spoelstra <hsp.cat7@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: rename local variable in configure_acceleratorsPaolo Bonzini
Silly patch extracted from the next one, which is already big enough. Because there are already local variables named "accel", we will name the global vl.c variable for "-M accel" accelerators instead. Rename it already in configure_accelerators to be ready. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15Remove the deprecated -show-cursor optionThomas Huth
It has been marked as deprecated since QEMU v5.0, replaced by the corresponding parameter of the -display option. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20201210155808.233895-5-thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15Remove the deprecated -realtime optionThomas Huth
It has been marked as deprecated since QEMU v4.2, replaced by the -overcommit option. Time to remove it now. Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20201210155808.233895-4-thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15accel/tcg: Remove deprecated '-tb-size' optionPhilippe Mathieu-Daudé
The '-tb-size' option (replaced by '-accel tcg,tb-size') is deprecated since 5.0 (commit fe174132478). Remove it. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20201202112714.1223783-1-philmd@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20201210155808.233895-2-thuth@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: Add option to avoid stopping VM upon guest panicAlejandro Jimenez
The current default action of pausing a guest after a panic event is received leaves the responsibility to resume guest execution to the management layer. The reasons for this behavior are discussed here: https://lore.kernel.org/qemu-devel/52148F88.5000509@redhat.com/ However, in instances like the case of older guests (Linux and Windows) using a pvpanic device but missing support for the PVPANIC_CRASHLOADED event, and Windows guests using the hv-crash enlightenment, it is desirable to allow the guests to continue running after sending a PVPANIC_PANICKED event. This allows such guests to proceed to capture a crash dump and automatically reboot without intervention of a management layer. Add an option to avoid stopping a VM after a panic event is received, by passing: -action panic=none in the command line arguments, or during runtime by using an upcoming QMP command. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Message-Id: <1607705564-26264-3-git-send-email-alejandro.j.jimenez@oracle.com> [Do not fix panic action in the variable, instead modify -no-shutdown. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: Add an -action option specifying response to guest eventsAlejandro Jimenez
Several command line options currently in use are meant to modify the behavior of QEMU in response to certain guest events like: -no-reboot, -no-shutdown, -watchdog-action. These can be grouped into a single option of the form: -action event=action Which can be used to specify the existing options above in the following format: -action reboot=none|shutdown -action shutdown=poweroff|pause -action watchdog=reset|shutdown|poweroff|pause|debug|none|inject-nmi This is done in preparation for adding yet another option of this type, which modifies the QEMU behavior when a guest panic occurs. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Message-Id: <1607705564-26264-2-git-send-email-alejandro.j.jimenez@oracle.com> [Use QemuOpts help support, invoke QMP command. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15qmp: generalize watchdog-set-action to -no-reboot/-no-shutdownAlejandro Jimenez
Add a QMP command to allow for the behaviors specified by the -no-reboot and -no-shutdown command line option to be set at runtime. The new command is named set-action and takes optional arguments, named after an event, that provide a corresponding action to take. Example: -> { "execute": "set-action", "arguments": { "reboot": "none", "shutdown": "poweroff", "watchdog": "debug" } } <- { "return": {} } Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com> Message-Id: <1607705564-26264-4-git-send-email-alejandro.j.jimenez@oracle.com> [Split the series differently, with -action based on the QMP command. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15memory: allow creating MemoryRegions before acceleratorsPaolo Bonzini
Compute the DIRTY_MEMORY_CODE bit in memory_region_get_dirty_log_mask instead of memory_region_init_*. This makes it possible to allocate memory backend objects at any time. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15plugin: propagate errorsPaolo Bonzini
qemu_finish_machine_init currently can only exit QEMU if it fails. Prepare for giving it proper error propagation, and possibly for adding a plugin_add monitor command that calls an accelerator method. While at it, make all errors from plugin_load look the same. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: make qemu_get_machine_opts staticPaolo Bonzini
Machine options can be retrieved as properties of the machine object. Encourage that by removing the "easy" accessor to machine options. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15machine: introduce MachineInitPhasePaolo Bonzini
Generalize the qdev_hotplug variable to the different phases of machine initialization. We would like to allow different monitor commands depending on the phase. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15chardev: do not use machine_init_donePaolo Bonzini
machine_init_done is not the right flag to check when preconfig is taken into account; for example "./qemu-system-x86_64 -serial mon:stdio -preconfig" does not print the QEMU monitor header until after exit_preconfig. Add back a custom bool for mux character devices. This partially undoes commit c7278b4355 ("chardev: introduce chr_machine_done hook", 2018-03-12), but it keeps the cleaner logic using a function pointer in ChardevClass. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: move all generic initialization out of vl.cPaolo Bonzini
qdev_machine_creation_done is only setting a flag now. Extend it to move more code out of vl.c. Leave only consistency checks and gdbserver processing in qemu_machine_creation_done. gdbserver_start can be moved after qdev_machine_creation_done because it only does listen on the socket and creates some internal data structures; it does not send any data (e.g. guest state) over the socket. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: extract softmmu/globals.cPaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: extract softmmu/runstate.cPaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: allow -incoming defer with -preconfigPaolo Bonzini
Now that there is no RUN_STATE_PRECONFIG anymore that can conflict with RUN_STATE_INMIGRATE, we can allow -incoming defer with -preconfig. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15vl: remove separate preconfig main_loopPaolo Bonzini
Move post-preconfig initialization to the x-exit-preconfig. If preconfig is not requested, just exit preconfig mode immediately with the QMP command. As a result, the preconfig loop will run with accel_setup_post and os_setup_post restrictions (xen_restrict, chroot, etc.) already done. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-15remove preconfig statePaolo Bonzini
The preconfig state is only used if -incoming is not specified, which makes the RunState state machine more tricky than it need be. However there is already an equivalent condition which works even with -incoming, namely qdev_hotplug. Use it instead of a separate runstate. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10config-file: move -set implementation to vl.cPaolo Bonzini
We want to make it independent of QemuOpts. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: clean up -boot variablesPaolo Bonzini
Move more of them into MachineState, in preparation for moving initialization of the machine out of vl.c. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: remove serial_max_hdsPaolo Bonzini
serial_hd(i) is NULL if and only if i >= serial_max_hds(). Test serial_hd(i) instead of bounding the loop at serial_max_hds(), thus removing one more function that vl.c is expected to export. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: extract softmmu/rtc.cPaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: extract machine done notifiersPaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: extract softmmu/datadir.cPaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: start VM via qmp_contPaolo Bonzini
Complement the previous patch by starting the VM with a QMP command. The plan is that the user will be able to do the same, invoking two commands "finish-machine-init" and "cont" instead of "x-exit-preconfig". Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10migration, vl: start migration via qmp_migrate_incomingPaolo Bonzini
Make qemu_start_incoming_migration local to migration/migration.c. By using the runstate instead of a separate flag, vl need not do anything to setup deferred incoming migration. qmp_migrate_incoming also does not need the deferred_incoming flag anymore, because "-incoming PROTOCOL" will clear the "once" flag before the main loop starts. Therefore, later invocations of the migrate-incoming command will fail with the existing "The incoming migration has already been started" error message. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: move -global check earlierPaolo Bonzini
The check has the same effect here, it only matters that it is performed once all devices, both builtin and user-specified, have been created. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: initialize displays before preconfig loopPaolo Bonzini
Displays should be available before the monitor starts, so that it is possible to use the graphical console to interact with the monitor itself. This patch is quite ugly, but all this is temporary. The double call to qemu_init_displays will go away as soon we can unify machine initialization between the preconfig and "normal" flows, and so will the preconfig_exit_requested variable (that is only preconfig_requested remains). Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: separate qemu_resolve_machine_memdevPaolo Bonzini
This is a bit nasty: the machine is storing a string and later resolving it. We probably want to remove the memdev property and instead make this a memory-set command. "-M memdev" can be handled a legacy option that is special cased by machine_set_property. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: separate qemu_apply_machine_optionsPaolo Bonzini
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: separate qemu_create_machinePaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: separate qemu_create_late_backendsPaolo Bonzini
"Late" backends are created after the machine. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: separate qemu_create_early_backendsPaolo Bonzini
"Early" backends are created before the machine and can be used as machine options. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: move CHECKPOINT_INIT after preconfigPaolo Bonzini
Move CHECKPOINT_INIT right before the machine initialization is completed. Everything before is essentially an extension of command line parsing. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: extract default devices to separate functionsPaolo Bonzini
Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: load plugins as late as possiblePaolo Bonzini
There is no need to load plugins in the middle of default device processing, move -plugin handling just before preconfig is entered. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: create "-net nic -net user" default earlierPaolo Bonzini
Create it together with other default backends, even though the processing is done later. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10qemu-option: restrict qemu_opts_set to merge-lists QemuOptsPaolo Bonzini
qemu_opts_set is used to create default network backends and to parse sugar options -kernel, -initrd, -append, -bios and -dtb. These are very different uses: I would *expect* a function named qemu_opts_set to set an option in a merge-lists QemuOptsList, such as -kernel, and possibly to set an option in a non-merge-lists QemuOptsList with non-NULL id, similar to -set. However, it wouldn't *work* to use qemu_opts_set for the latter because qemu_opts_set uses fail_if_exists==1. So, for non-merge-lists QemuOptsList and non-NULL id, the semantics of qemu_opts_set (fail if the (QemuOptsList, id) pair already exists) are debatable. On the other hand, I would not expect qemu_opts_set to create a non-merge-lists QemuOpts with a single option; which it does, though. For this case of non-merge-lists QemuOptsList and NULL id, qemu_opts_set hardly adds value over qemu_opts_parse. It does skip some parsing and unescaping, but that's not needed when creating default network backends. So qemu_opts_set has warty behavior for non-merge-lists QemuOptsList if id is non-NULL, and it's mostly pointless if id is NULL. My solution to keeping the API as simple as possible is to limit qemu_opts_set to merge-lists QemuOptsList. For them, it's useful (we don't want comma-unescaping for -kernel) *and* has sane semantics. Network backend creation is switched to qemu_opts_parse. qemu_opts_set is now only used on merge-lists QemuOptsList... except in the testcase, which is changed to use a merge-list QemuOptsList. With this change we can also remove the id parameter. With the parameter always NULL, we know that qemu_opts_create cannot fail and can pass &error_abort to it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-12-10vl: extract various command line desugaring snippets to a new functionPaolo Bonzini
Keep the machine initialization sequence free of miscellaneous command line parsing actions. The only difference is that preallocation will always be done with one thread if -smp is not provided; previously it was using mc->default_cpus, which is almost always 1 anyway. Reviewed-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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