gitlab-ci: Update QEMU_JOB_AVOCADO and QEMU_CI_AVOCADO_TESTING

Since we don't run the Avocado jobs in the CI anymore, rename
these variables to QEMU_JOB_FUNCTIONAL and QEMU_CI_FUNCTIONAL.

Also, the

gitlab-ci: Update QEMU_JOB_AVOCADO and QEMU_CI_AVOCADO_TESTING

Since we don't run the Avocado jobs in the CI anymore, rename
these variables to QEMU_JOB_FUNCTIONAL and QEMU_CI_FUNCTIONAL.

Also, there was a mismatch between the documentation and the
implementation of QEMU_CI_AVOCADO_TESTING: While the documentation
said that you had to "Set this variable to have the tests using the
Avocado framework run automatically", you indeed needed to set it
to make the pipelines appear in your dashboard - but they were never
run automatically in forks and had to be triggered manually. Let's
improve this now: No need to hide these pipelines from the users
by default anymore (the functional tests should be stable enough
nowadays), and rather allow the users to run the pipelines auto-
matically with this switch now instead, as was documented.

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-ID: <20250414113031.151105-15-thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

show more ...

docs: Fix some typos (found by codespell and typos)

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Michael Tokarev <mjt@tls.msk.ru>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

docs/sphinx/qmp_lexer: Generalize elision syntax

Accept "... lorem ipsum ..." in addition to "...".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250404121413.1743790-7-armbr

docs/sphinx/qmp_lexer: Generalize elision syntax

Accept "... lorem ipsum ..." in addition to "...".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250404121413.1743790-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

docs/devel/qapi-code-gen: Improve the part on qmp-example directive

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250404121413.1743790-6-armbru@redhat.com>
Reviewed-by: Eric Bl

docs/devel/qapi-code-gen: Improve the part on qmp-example directive

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250404121413.1743790-6-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

docs/devel/qapi-code-gen: Tidy up whitespace

Consistently use two spaces to separate sentences.

Put "::" on a line of its own when it's preceded by whitespace.

Signed-off-by: Markus Armbruster <ar

docs/devel/qapi-code-gen: Tidy up whitespace

Consistently use two spaces to separate sentences.

Put "::" on a line of its own when it's preceded by whitespace.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250404121413.1743790-2-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

docs/devel/testing/functional: Add a section about logging

We should tell the users where to find the log file.
While we're at it, also rename the "Overview" heading to a
more accurate "Introduction

docs/devel/testing/functional: Add a section about logging

We should tell the users where to find the log file.
While we're at it, also rename the "Overview" heading to a
more accurate "Introduction to writing tests" instead.

Reported-by: Aditya Gupta <adityag@linux.ibm.com>
Message-ID: <20250318092021.53719-1-thuth@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

show more ...

docs: disambiguate references in qapi-domain.rst

Before we enable the QGA and QSD namespaces, we need to disambiguate
some of the references that would become ambiguous as a result!

Signed-off-by:

docs: disambiguate references in qapi-domain.rst

Before we enable the QGA and QSD namespaces, we need to disambiguate
some of the references that would become ambiguous as a result!

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250313044312.189276-11-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

docs/qapi_domain: add namespace support to cross-references

This patch does three things:

1. Record the current namespace context in pending_xrefs so it can be
used for link resolution later,
2.

docs/qapi_domain: add namespace support to cross-references

This patch does three things:

1. Record the current namespace context in pending_xrefs so it can be
used for link resolution later,
2. Pass that recorded namespace context to find_obj() when resolving a
reference, and
3. Wildly and completely rewrite find_obj().

cross-reference support is expanded to tolerate the presence or absence
of either namespace or module, and to cope with the presence or absence
of contextual information for either.

References now work like this:

1. If the explicit reference target is recorded in the domain's object
registry, we link to that target and stop looking. We do this lookup
regardless of how fully qualified the target is, which allows direct
references to modules (which don't have a module component to their
names) or direct references to definitions that may or may not belong
to a namespace or module.

2. If contextual information is available from qapi:namespace or
qapi:module directives, try using those components to find a direct
match to the implied target name.

3. If both prior lookups fail, generate a series of regular expressions
looking for wildcard matches in order from most to least
specific. Any explicitly provided components (namespace, module)
*must* match exactly, but both contextual and entirely omitted
components are allowed to differ from the search result. Note that if
more than one result is found, Sphinx will emit a warning (a build
error for QEMU) and list all of the candidate references.

The practical upshot is that in the large majority of cases, namespace
and module information is not required when creating simple `references`
to definitions from within the same context -- even when identical
definitions exist in other contexts.

Even when using simple `references` from elsewhere in the QEMU
documentation manual, explicit namespace info is not required if there
is only one definition by that name.

Disambiguation *will* be required from outside of the QAPI documentation
when referencing e.g. block-core definitions, which are shared between
QEMU QMP and the QEMU Storage Daemon. In that case, there are two
options:

A: References can be made partially or fully explicit,
e.g. `QMP:block-dirty-bitmap-add` will link to the QEMU version of
the definition, while `QSD:block-dirty-bitmap-add` would link to the
QSD version.

B: If all of the references in a document are intended to go to the same
place, you can insert a "qapi:namespace:: QMP" directive to influence
the fuzzy-searching for later references.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250313044312.189276-8-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
[Commit message typo fixed]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

docs/qapi-domain: add qapi:namespace directive

Add a new directive that marks the beginning of a QAPI "namespace", for
example; "QMP", "QGA" or "QSD". This directive will associate all
subsequent QA

docs/qapi-domain: add qapi:namespace directive

Add a new directive that marks the beginning of a QAPI "namespace", for
example; "QMP", "QGA" or "QSD". This directive will associate all
subsequent QAPI directives in a document with the specified
namespace. This does not change the visual display of any of the
definitions or index entries, but does change the "Fully Qualified Name"
inside the QAPI domain's object table. This allows for two different
"namespaces" to define entities with otherwise identical names -- which
will come in handy for documenting both QEMU QMP and the QEMU Storage
Daemon.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250313044312.189276-6-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

docs/qapi-domain: add :namespace: override option

Akin to the :module: override option, the :namespace: options allows you
to forcibly override the contextual namespace associatied with a
definition

docs/qapi-domain: add :namespace: override option

Akin to the :module: override option, the :namespace: options allows you
to forcibly override the contextual namespace associatied with a
definition.

We don't necessarily actually need this, but I felt compelled to stick
close to how the Python domain works that offers context overrides.

As of this commit, it is possible to add e.g. ":namespace: QMP" to any
QAPI directive to forcibly associate that definition with a given
namespace.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250313044312.189276-5-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

Merge tag 'pull-request-2025-03-13' of https://gitlab.com/thuth/qemu into staging

* Various fixes for functional tests
* Fix the name of the "configs" directory in the documentation

# -----BEGIN PG

Merge tag 'pull-request-2025-03-13' of https://gitlab.com/thuth/qemu into staging

* Various fixes for functional tests
* Fix the name of the "configs" directory in the documentation

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# gpg: Signature made Thu 13 Mar 2025 15:47:52 HKT
# gpg: using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg: issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg: aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg: aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg: aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2025-03-13' of https://gitlab.com/thuth/qemu:
tests/functional: skip vulkan test if missing vulkaninfo
tests/functional/asset: Add AssetError exception class
tests/functional/asset: Verify downloaded size
tests/functional/asset: Fail assert fetch when retries are exceeded
docs/system: Fix the information on how to run certain functional tests
tests/functional: Bump up arm_replay timeout
tests/functional: Require 'user' netdev for ppc64 e500 test
docs: Rename default-configs to configs

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

docs: Rename default-configs to configs

This was missed at the time.

Fixes: 812b31d3f91 ("configs: rename default-configs to configs and reorganise")
Signed-off-by: Greg Kurz <groug@kaod.org>
Revie

docs: Rename default-configs to configs

This was missed at the time.

Fixes: 812b31d3f91 ("configs: rename default-configs to configs and reorganise")
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250306174113.427116-1-groug@kaod.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>

show more ...

docs: add qapi-domain syntax documentation

Who documents the documentation?

Me, I guess.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250311034303.75779-63-jsnow@redhat.com>
Acked-by

docs: add qapi-domain syntax documentation

Who documents the documentation?

Me, I guess.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250311034303.75779-63-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

docs: disambiguate cross-references

The next patch will engage the qapidoc transmogrifier, which creates a
lot of cross-reference targets. Some of the existing targets
("migration", "qom", "replay")

docs: disambiguate cross-references

The next patch will engage the qapidoc transmogrifier, which creates a
lot of cross-reference targets. Some of the existing targets
("migration", "qom", "replay") will become ambiguous as a result. Nail
them down more explicitly to prevent ambiguous cross-reference warnings.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250311034303.75779-61-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* scripts: dump stdin on meson-buildoptions error
* rust: introduce qemu_api::cell::Opaque<>
* rust: express pinning requirem

Merge tag 'for-upstream' of https://gitlab.com/bonzini/qemu into staging

* scripts: dump stdin on meson-buildoptions error
* rust: introduce qemu_api::cell::Opaque<>
* rust: express pinning requirements for timers
* rust: hpet: decode HPET registers into enums
* rust: cell: add full example of declaring a SysBusDevice
* rust: qom: remove operations on &mut

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# gpg: using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg: issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [full]
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" [full]
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83

* tag 'for-upstream' of https://gitlab.com/bonzini/qemu: (25 commits)
rust: pl011: Allow NULL chardev argument to pl011_create()
meson.build: default to -gsplit-dwarf for debug info
rust: qom: remove operations on &mut
rust: cell: add full example of declaring a SysBusDevice
rust: hpet: decode HPET registers into enums
rust: pl011: pass around registers::Data
rust: pl011: switch to safe chardev operation
rust: pl011: clean up visibilities of callbacks
rust: pl011: move register definitions out of lib.rs
rust: chardev: provide basic bindings to character devices
rust: bindings: remove more unnecessary Send/Sync impls
rust: chardev: wrap Chardev with Opaque<>
rust: memory: wrap MemoryRegion with Opaque<>
rust: sysbus: wrap SysBusDevice with Opaque<>
rust: hpet: do not access fields of SysBusDevice
rust: qdev: wrap Clock and DeviceState with Opaque<>
rust: qom: wrap Object with Opaque<>
rust: irq: wrap IRQState with Opaque<>
rust: timer: wrap QEMUTimer with Opaque<> and express pinning requirements
rust: hpet: embed Timer without the Option and Box indirection
...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

Merge tag 'pull-request-2025-03-07' of https://gitlab.com/thuth/qemu into staging

* Bug fixes and some small improvements for functional tests
* Improve performance of s390x PCI passthrough devices

Merge tag 'pull-request-2025-03-07' of https://gitlab.com/thuth/qemu into staging

* Bug fixes and some small improvements for functional tests
* Improve performance of s390x PCI passthrough devices with relaxed translation

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# gpg: Signature made Fri 07 Mar 2025 19:51:55 HKT
# gpg: using RSA key 27B88847EEE0250118F3EAB92ED9D774FE702DB5
# gpg: issuer "thuth@redhat.com"
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>" [full]
# gpg: aka "Thomas Huth <thuth@redhat.com>" [full]
# gpg: aka "Thomas Huth <huth@tuxfamily.org>" [full]
# gpg: aka "Thomas Huth <th.huth@posteo.de>" [unknown]
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5

* tag 'pull-request-2025-03-07' of https://gitlab.com/thuth/qemu:
s390x/pci: indicate QEMU supports relaxed translation for passthrough
s390x/pci: add support for guests that request direct mapping
MAINTAINERS: Add docs/devel/testing/functional.rst to the functional section
doc: add missing 'Asset' type in function test doc
tests/functional/test_virtio_balloon: Only use KVM for running this test
tests/functional: fix race in virtio balloon test
tests/functional: Increase the timeout of the mips64el_replay test
tests/functional/test_mips_malta: Add a network test via the pcnet NIC
tests/functional: Move the code for testing HTTP downloads to a common function
tests/functional: stop output from zstd command when uncompressing
tests/functional: drop unused 'get_tag' method
tests/functional: skip memaddr tests on 32-bit builds
tests/functional: reduce tuxrun maxmem to work on 32-bit hosts
tests/functional: set 'qemu_bin' as an object level field
tests/functional: remove unused 'bin_prefix' variable

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

doc: add missing 'Asset' type in function test doc

Seems 'Asset' got missed in the documentation by mistake.

Also fix the one spellcheck issue pointed by spellcheck

Signed-off-by: Aditya Gupta <ad

doc: add missing 'Asset' type in function test doc

Seems 'Asset' got missed in the documentation by mistake.

Also fix the one spellcheck issue pointed by spellcheck

Signed-off-by: Aditya Gupta <adityag@linux.ibm.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250306060706.1982992-1-adityag@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

show more ...

Merge tag 'pull-vfio-20250306' of https://github.com/legoater/qemu into staging

vfio queue:

* Added property documentation
* Added Minor fixes
* Implemented basic PCI PM capability backing
* Promot

Merge tag 'pull-vfio-20250306' of https://github.com/legoater/qemu into staging

vfio queue:

* Added property documentation
* Added Minor fixes
* Implemented basic PCI PM capability backing
* Promoted new IGD maintainer
* Deprecated vfio-plaform
* Extended VFIO migration with multifd support

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# gpg: Signature made Thu 06 Mar 2025 22:13:46 HKT
# gpg: using RSA key A0F66548F04895EBFE6B0B6051A343C7CFFBECA1
# gpg: Good signature from "Cédric Le Goater <clg@redhat.com>" [full]
# gpg: aka "Cédric Le Goater <clg@kaod.org>" [full]
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B 0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20250306' of https://github.com/legoater/qemu: (42 commits)
hw/core/machine: Add compat for x-migration-multifd-transfer VFIO property
vfio/migration: Make x-migration-multifd-transfer VFIO property mutable
vfio/migration: Add x-migration-multifd-transfer VFIO property
vfio/migration: Multifd device state transfer support - send side
vfio/migration: Multifd device state transfer support - config loading support
migration/qemu-file: Define g_autoptr() cleanup function for QEMUFile
vfio/migration: Multifd device state transfer support - load thread
vfio/migration: Multifd device state transfer support - received buffers queuing
vfio/migration: Setup and cleanup multifd transfer in these general methods
vfio/migration: Multifd setup/cleanup functions and associated VFIOMultifd
vfio/migration: Multifd device state transfer - add support checking function
vfio/migration: Multifd device state transfer support - basic types
vfio/migration: Move migration channel flags to vfio-common.h header file
vfio/migration: Add vfio_add_bytes_transferred()
vfio/migration: Convert bytes_transferred counter to atomic
vfio/migration: Add load_device_config_state_start trace event
migration: Add save_live_complete_precopy_thread handler
migration/multifd: Add multifd_device_state_supported()
migration/multifd: Make MultiFDSendData a struct
migration/multifd: Device state transfer support - send side
...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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rust: qemu_api_macros: add Wrapper derive macro

Add a derive macro that makes it easy to peel off all the layers of
specialness (UnsafeCell, MaybeUninit, etc.) and just get a pointer
to the wrapped

rust: qemu_api_macros: add Wrapper derive macro

Add a derive macro that makes it easy to peel off all the layers of
specialness (UnsafeCell, MaybeUninit, etc.) and just get a pointer
to the wrapped type; and likewise add them back starting from a
*mut.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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rust: cell: add wrapper for FFI types

Inspired by the same-named type in Linux. This type provides the compiler
with a correct view of what goes on with FFI types. In addition, it
separates the gl

rust: cell: add wrapper for FFI types

Inspired by the same-named type in Linux. This type provides the compiler
with a correct view of what goes on with FFI types. In addition, it
separates the glue code from the bindgen-generated code, allowing
traits such as Send, Sync or Zeroable to be specified independently
for C and Rust structs.

Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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docs/devel/qapi-code-gen: Discourage use of 'prefix'

QAPI's 'prefix' feature can make the connection between enumeration
type and its constants less than obvious. It's best used with
restraint. Co

docs/devel/qapi-code-gen: Discourage use of 'prefix'

QAPI's 'prefix' feature can make the connection between enumeration
type and its constants less than obvious. It's best used with
restraint. Commit 7bbadc60b5..64f5e9db77 eliminated most uses.
Discourage new ones.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20250228134335.132278-1-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

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tests/functional: set 'qemu_bin' as an object level field

The 'qemu_bin' field is currently set on the class, despite being
accessed as if it were an object instance field with 'self.qemu_bin'.

Thi

tests/functional: set 'qemu_bin' as an object level field

The 'qemu_bin' field is currently set on the class, despite being
accessed as if it were an object instance field with 'self.qemu_bin'.

This is no obvious need to have it as a class field, so move it into
the object instance.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250228102738.3064045-3-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

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vfio/migration: Add x-migration-multifd-transfer VFIO property

This property allows configuring whether to transfer the particular device
state via multifd channels when live migrating that device.

vfio/migration: Add x-migration-multifd-transfer VFIO property

This property allows configuring whether to transfer the particular device
state via multifd channels when live migrating that device.

It defaults to AUTO, which means that VFIO device state transfer via
multifd channels is attempted in configurations that otherwise support it.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/d6dbb326e3d53c7104d62c96c9e3dd64e1c7b940.1741124640.git.maciej.szmigiero@oracle.com
[ clg: Added documentation ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

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vfio/migration: Multifd device state transfer support - send side

Implement the multifd device state transfer via additional per-device
thread inside save_live_complete_precopy_thread handler.

Swit

vfio/migration: Multifd device state transfer support - send side

Implement the multifd device state transfer via additional per-device
thread inside save_live_complete_precopy_thread handler.

Switch between doing the data transfer in the new handler and doing it
in the old save_state handler depending if VFIO multifd transfer is enabled
or not.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/4d727e2e0435e0022d50004e474077632830e08d.1741124640.git.maciej.szmigiero@oracle.com
[ clg: - Reordered savevm_vfio_handlers
- Updated save_live_complete_precopy* documentation ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

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vfio/migration: Multifd device state transfer support - load thread

Add a thread which loads the VFIO device state buffers that were received
via multifd.

Each VFIO device that has multifd device s

vfio/migration: Multifd device state transfer support - load thread

Add a thread which loads the VFIO device state buffers that were received
via multifd.

Each VFIO device that has multifd device state transfer enabled has one
such thread, which is created using migration core API
qemu_loadvm_start_load_thread().

Since it's important to finish loading device state transferred via the
main migration channel (via save_live_iterate SaveVMHandler) before
starting loading the data asynchronously transferred via multifd the thread
doing the actual loading of the multifd transferred data is only started
from switchover_start SaveVMHandler.

switchover_start handler is called when MIG_CMD_SWITCHOVER_START
sub-command of QEMU_VM_COMMAND is received via the main migration channel.

This sub-command is only sent after all save_live_iterate data have already
been posted so it is safe to commence loading of the multifd-transferred
device state upon receiving it - loading of save_live_iterate data happens
synchronously in the main migration thread (much like the processing of
MIG_CMD_SWITCHOVER_START) so by the time MIG_CMD_SWITCHOVER_START is
processed all the proceeding data must have already been loaded.

Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/9abe612d775aaf42e31646796acd2363c723a57a.1741124640.git.maciej.szmigiero@oracle.com
[ clg: - Reordered savevm_vfio_handlers
- Added switchover_start documentation ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

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