[Qemu-commits] [qemu/qemu] 6fbef9: target/i386: Fix 32-bit AD[CO]X insns in 64-bit mode

[Peter Maydell]

  Branch: refs/heads/staging
  Home:   https://github.com/qemu/qemu
  Commit: 6fbef9426bac7184b5d5887589d8386e732865eb
      
https://github.com/qemu/qemu/commit/6fbef9426bac7184b5d5887589d8386e732865eb
  Author: Richard Henderson <richard.henderson@linaro.org>
  Date:   2023-02-16 (Thu, 16 Feb 2023)

  Changed paths:
    M target/i386/tcg/emit.c.inc
    M tests/tcg/x86_64/Makefile.target
    A tests/tcg/x86_64/adox.c

  Log Message:
  -----------
  target/i386: Fix 32-bit AD[CO]X insns in 64-bit mode

Failure to truncate the inputs results in garbage for the carry-out.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1373
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20230115012103.3131796-1-richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>


  Commit: 3ada67a306904fe0eb3093aff9278439a0e093c8
      
https://github.com/qemu/qemu/commit/3ada67a306904fe0eb3093aff9278439a0e093c8
  Author: Brad Smith <brad@comstyle.com>
  Date:   2023-02-17 (Fri, 17 Feb 2023)

  Changed paths:
    M meson.build
    M util/qemu-thread-posix.c

  Log Message:
  -----------
  thread-posix: add support for setting threads name on OpenBSD

Make use of pthread_set_name_np() to be able to set the threads name
on OpenBSD.

Signed-off-by: Brad Smith <brad@comstyle.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <Y57NrCmPTVSXLWC4@humpty.home.comstyle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>


  Commit: 8d0efbcfa0656bef76e95d40933b6243feca58c9
      
https://github.com/qemu/qemu/commit/8d0efbcfa0656bef76e95d40933b6243feca58c9
  Author: Paolo Bonzini <pbonzini@redhat.com>
  Date:   2023-02-20 (Mon, 20 Feb 2023)

  Changed paths:
    M docs/about/build-platforms.rst

  Log Message:
  -----------
  docs: build-platforms: refine requirements on Python build dependencies

Historically, the critical dependency for both building and running
QEMU has been the distro packages.  Because QEMU is written in C and C's
package management has been tied to distros (at least if you do not want
to bundle libraries with the binary, otherwise I suppose you could use
something like conda or wrapdb), C dependencies of QEMU would target the
version that is shipped in relatively old but still commonly used distros.

For non-C libraries, however, the situation is different, as these
languages have their own package management tool (cpan, pip, gem, npm,
and so on).  For some of these languages, the amount of dependencies
for even a simple program can easily balloon to the point that many
distros have given up on packaging non-C code.  For this reason, it has
become increasingly normal for developers to download dependencies into
a self-contained local environment, instead of relying on distro packages.

Fortunately, this affects QEMU only at build time, as qemu.git does
not package non-C artifacts such as the qemu.qmp package; but still,
as we make more use of Python, we experience a clash between a support
policy that is written for the C world, and dependencies (both direct
and indirect) that increasingly do not care for the distro versions
and are quick at moving past Python runtime versions that are declared
end-of-life.

For example, Python 3.6 has been EOL'd since December 2021 and Meson 0.62
(released the following March) already dropped support for it.  Yet,
Python 3.6 is the default version of the Python runtime for RHEL/CentOS
8 and SLE 15, respectively the penultimate and the most recent version
of two distros that QEMU would like to support.  (It is also the version
used by Ubuntu 18.04, but QEMU stopped supporting it in April 2022).

There are good reasons to move forward with the deprecation of Python
3.6 in QEMU as well: completing the configure->meson switch (which
requires Meson 0.63), and making the QAPI generator fully typed (which
requires newer versions of not just mypy but also Python, due to PEP563).

Fortunately, these long-term support distros do include newer versions of
the Python runtime.  However, these more recent runtimes only come with
a very small subset of the Python packages that the distro includes.
Because most dependencies are optional tests (avocado, mypy, flake8)
and Meson is bundled with QEMU, the most noticeably missing package is
Sphinx (and the readthedocs theme).  There are four possibilities:

* we change the support policy and stop supporting CentOS 8 and SLE 15;
  not a good idea since CentOS 8 is not an unreasonable distro for us to
  want to continue to support

* we keep supporting Python 3.6 until CentOS 8 and SLE 15 stop being
  supported.  This is a possibility---but we may want to revise the support
  policy anyway because SLE 16 has not even been released, so this would
  mean delaying those desirable reasons for perhaps three years;

* we support Python 3.6 just for building documentation, i.e. we are
  careful not to use Python 3.7+ features in our Sphinx extensions but are
  free to use them elsewhere.  Besides being more complicated to understand
  for developers, this can be quite limiting; parts of the QAPI generator
  run at sphinx-build time, which would exclude one of the areas which
  would benefit from a newer version of the runtime;

* we only support Python 3.7+, which means CentOS 8 CI and users
  have to either install Sphinx from pip or disable documentation.

This proposed update to the support policy chooses the last of these
possibilities.  It does by modifying three aspects of the support
policy:

* it introduces different support periods for *native* vs. *non-native*
  dependencies.  Non-native dependencies are currently Python ones only,
  and for simplicity the policy only mentions Python; however, the concept
  generalizes to other languages with a well-known upstream package
  manager, that users of older distributions can fetch dependencies from;

* it opens up the possibility of taking non-native dependencies from their
  own package index instead of using the version in the distribution.  The
  wording right now is specific to dependencies that are only required at
  build time.  In the future we may have to refine it if, for example, parts
  of QEMU will be written in Rust; in that case, crates would be handled
  in a similar way to submodules and vendored in the release tarballs.

* it mentions specifically that optional build dependencies are excluded
  from the platform policy.  Tools such as mypy don't affect the ability
  to build QEMU and move fast enough that distros cannot standardize on
  a single version of them (for example RHEL9 does not package them at
  all, nor does it run them at rpmbuild time).  In other cases, such as
  cross compilers, we have alternatives.

Right now, non-native dependencies have to be download manually by
running "pip" before "configure".  In the future, it will be desirable
for configure to set up a virtual environment and download them in the
same way that it populates git submodules (but, in this case, without
vendoring them in the release tarballs).

Just like with submodules, this would make things easier for people
that can afford accessing the network in their build environment; the
option to populate the build environment manually would remain for
people whose build machines lack network access.  The change to the
support policy neither requires nor forbids this future change.

[Thanks to Daniel P. Berrangé, Peter Maydell and others for discussions
 that were copied or summarized in the above commit message]

Cc: Markus Armbruster <armbru@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: John Snow <jsnow@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>


  Commit: 49be78ca02a687ea00ad7534254217b479a4e92d
      
https://github.com/qemu/qemu/commit/49be78ca02a687ea00ad7534254217b479a4e92d
  Author: TaiseiIto <taisei1212@outlook.jp>
  Date:   2023-02-21 (Tue, 21 Feb 2023)

  Changed paths:
    M target/i386/gdbstub.c

  Log Message:
  -----------
  target/i386/gdbstub: Fix a bug about order of FPU stack in 'g' packets.

Before this commit, when GDB attached an OS working on QEMU, order of FPU
stack registers printed by GDB command 'info float' was wrong. There was a
bug causing the problem in 'g' packets sent by QEMU to GDB. The packets have
values of registers of machine emulated by QEMU containing FPU stack
registers. There are 2 ways to specify a x87 FPU stack register. The first
is specifying by absolute indexed register names (R0, ..., R7). The second
is specifying by stack top relative indexed register names (ST0, ..., ST7).
Values of the FPU stack registers should be located in 'g' packet and be
ordered by the relative index. But QEMU had located these registers ordered
by the absolute index. After this commit, when QEMU reads registers to make
a 'g' packet, QEMU specifies FPU stack registers by the relative index.
Then, the registers are ordered correctly in the packet. As a result, GDB,
the packet receiver, can print FPU stack registers in the correct order.

Signed-off-by: TaiseiIto <taisei1212@outlook.jp>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: 
<TY0PR0101MB4285923FBE9AD97CE832D95BA4E59@TY0PR0101MB4285.apcprd01.prod.exchangelabs.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>


  Commit: aef633e76504f6f2f3be47a22b271ce6469c0d9d
      
https://github.com/qemu/qemu/commit/aef633e76504f6f2f3be47a22b271ce6469c0d9d
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-22 (Wed, 22 Feb 2023)

  Changed paths:
    M python/qemu/qmp/protocol.py
    M python/qemu/qmp/qmp_client.py
    M python/qemu/utils/qemu_ga_client.py
    M tests/qemu-iotests/iotests.py
    M tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test

  Log Message:
  -----------
  python: support pylint 2.16

Pylint 2.16 adds a few new checks that cause the optional check-tox CI
job to fail.

1. The superfluous-parens check seems to be a bit more aggressive,
2. broad-exception-raised is new; it discourages "raise Exception".

Fix these minor issues and turn the lights green.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Beraldo Leal <bleal@redhat.com>
Message-id: 20230210003147.1309376-2-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>


  Commit: 6832189fd791622c30e7bbe3a12b76be14dc1158
      
https://github.com/qemu/qemu/commit/6832189fd791622c30e7bbe3a12b76be14dc1158
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-22 (Wed, 22 Feb 2023)

  Changed paths:
    M .gitlab-ci.d/static_checks.yml
    M python/.gitignore
    M python/Makefile
    R python/Pipfile
    R python/Pipfile.lock
    M python/README.rst
    M python/setup.cfg
    A python/tests/minreqs.txt
    M tests/docker/dockerfiles/python.docker

  Log Message:
  -----------
  python: drop pipenv

The pipenv tool was nice in theory, but in practice it's just too hard
to update selectively, and it makes using it a pain. The qemu.qmp repo
dropped pipenv support a while back and it's been functioning just fine,
so I'm backporting that change here to qemu.git.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20230210003147.1309376-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>


  Commit: ebf1b324e8d1b05be5327f3e6a13d8570f7fd1e3
      
https://github.com/qemu/qemu/commit/ebf1b324e8d1b05be5327f3e6a13d8570f7fd1e3
  Author: Markus Armbruster <armbru@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M docs/devel/qapi-code-gen.rst

  Log Message:
  -----------
  docs/devel/qapi-code-gen: Belatedly update features documentation

Commit 013b4efc9be "qapi: Add feature flags to remaining
definitions" (v5.0.0), commit 84ab0086879 "qapi: Add feature flags to
struct members" (v5.0.0), and commit b6c18755e41 "qapi: Add feature
flags to enum members" (v6.2.0) neglected to update section
"Features".  Make up for that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230213132009.918801-2-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>


  Commit: c2985e38f0a5e00bfb2540b43531baf485de2ee2
      
https://github.com/qemu/qemu/commit/c2985e38f0a5e00bfb2540b43531baf485de2ee2
  Author: Markus Armbruster <armbru@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M docs/devel/qapi-code-gen.rst

  Log Message:
  -----------
  docs/devel/qapi-code-gen: Fix a missing 'may', clarify SchemaInfo

Documentation of enumeration value conditions lacks a 'may'.  Fix
that.

Clarify SchemaInfo documentation for struct and union types.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230213132009.918801-3-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>


  Commit: 6f2ddcde774d5cbe522693b374f45a1bcb70cebf
      
https://github.com/qemu/qemu/commit/6f2ddcde774d5cbe522693b374f45a1bcb70cebf
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M scripts/qapi/.flake8

  Log Message:
  -----------
  qapi: Update flake8 config

New versions of flake8 don't like same-line comments. (It's a version
newer than what fc37 ships, but it still makes my life easier to fix it
now.)

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230215000011.1725012-2-jsnow@redhat.com>


  Commit: 885ecdbec9da62ede8019fc74f9154215e410aee
      
https://github.com/qemu/qemu/commit/885ecdbec9da62ede8019fc74f9154215e410aee
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M scripts/qapi/pylintrc

  Log Message:
  -----------
  qapi: update pylint configuration

Newer versions of pylint disable the "no-self-use" message by
default. Older versions don't, though. If we leave the suppressions in,
pylint yelps about useless options. Just tell pylint to shush.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230215000011.1725012-3-jsnow@redhat.com>


  Commit: c60caf8086247afbfbf0673993d809d348238ef6
      
https://github.com/qemu/qemu/commit/c60caf8086247afbfbf0673993d809d348238ef6
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M scripts/qapi/expr.py

  Log Message:
  -----------
  qapi: Add minor typing workaround for 3.6

Pylint under 3.6 does not believe that Collection is subscriptable at
runtime. It is, making this a Pylint
bug. https://github.com/PyCQA/pylint/issues/2377

They closed it as fixed, but that doesn't seem to be true as of Pylint
2.13.9, the latest version you can install under Python 3.6. 2.13.9 was
released 2022-05-13, about seven months after the bug was closed.

The least-annoying fix here is to just use the concret type.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20230215000011.1725012-4-jsnow@redhat.com>
[Dumbed down from Sequence[str] to List[str], commit message adjusted]
Reviewed-by: Markus Armbruster <armbru@redhat.com>


  Commit: 420110591c54f5fd38e065d5bddac73b3076bf9e
      
https://github.com/qemu/qemu/commit/420110591c54f5fd38e065d5bddac73b3076bf9e
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M scripts/qapi/expr.py
    M scripts/qapi/parser.py
    M scripts/qapi/schema.py

  Log Message:
  -----------
  qapi/parser: add QAPIExpression type

This patch creates a new type, QAPIExpression, which represents a parsed
expression complete with QAPIDoc and QAPISourceInfo.

This patch turns parser.exprs into a list of QAPIExpression instead,
and adjusts expr.py to match.

This allows the types we specify in parser.py to be "remembered" all the
way through expr.py and into schema.py. Several assertions around
packing and unpacking this data can be removed as a result.

It also corrects a harmless typing error.  Before the patch,
check_exprs() allegedly takes a List[_JSONObject].  It actually takes
a list of dicts of the form

    {'expr': E, 'info': I, 'doc': D}

where E is of type _ExprValue, I is of type QAPISourceInfo, and D is
of type QAPIDoc.  Key 'doc' is optional.  This is not a _JSONObject!
Passes type checking anyway, because _JSONObject is Dict[str, object].

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20230215000011.1725012-5-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Commit message amended to point out the typing fix]


  Commit: 67a81f9fb78d73398051fed0df7a0aac5b61b7c5
      
https://github.com/qemu/qemu/commit/67a81f9fb78d73398051fed0df7a0aac5b61b7c5
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M scripts/qapi/expr.py
    M scripts/qapi/parser.py

  Log Message:
  -----------
  qapi: remove _JSONObject

We can remove this alias as it only has two usages now, and no longer
pays for the confusion of "yet another type".

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20230215000011.1725012-6-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>


  Commit: c7b7a7ded9376ad936cfedd843752789ca61bc3b
      
https://github.com/qemu/qemu/commit/c7b7a7ded9376ad936cfedd843752789ca61bc3b
  Author: John Snow <jsnow@redhat.com>
  Date:   2023-02-23 (Thu, 23 Feb 2023)

  Changed paths:
    M scripts/qapi/parser.py

  Log Message:
  -----------
  qapi: remove JSON value FIXME

With the two major JSON-ish type hierarchies clarified for distinct
purposes; QAPIExpression for parsed expressions and JSONValue for
introspection data, remove this FIXME as no longer an action item.

A third JSON-y data type, _ExprValue, is not meant to represent JSON in
the abstract but rather only the possible legal return values from a
single function, get_expr(). It isn't appropriate to attempt to merge it
with either of the above two types.

In theory, it may be possible to define a completely agnostic
one-size-fits-all JSON type hierarchy that any other user could borrow -
in practice, it's tough to wrangle the differences between invariant,
covariant and contravariant types: input and output parameters demand
different properties of such a structure.

However, QAPIExpression serves to authoritatively type user input to the
QAPI parser, while JSONValue serves to authoritatively type qapi
generator *output* to be served back to client users at runtime via
QMP. The AST for these two types are different and cannot be wholly
merged into a unified syntax.

They could, in theory, share some JSON primitive definitions. In
practice, this is currently more trouble than it's worth with mypy's
current expressive power. As such, declare this "done enough for now".

Signed-off-by: John Snow <jsnow@redhat.com>
Message-Id: <20230215000011.1725012-7-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>


  Commit: 3f21065f0983d37c5d4a11a3c59bab5201a9f499
      
https://github.com/qemu/qemu/commit/3f21065f0983d37c5d4a11a3c59bab5201a9f499
  Author: Peter Maydell <peter.maydell@linaro.org>
  Date:   2023-02-24 (Fri, 24 Feb 2023)

  Changed paths:
    M docs/about/build-platforms.rst
    M meson.build
    M target/i386/gdbstub.c
    M target/i386/tcg/emit.c.inc
    M tests/tcg/x86_64/Makefile.target
    A tests/tcg/x86_64/adox.c
    M util/qemu-thread-posix.c

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

* x86 bugfixes
* OpenBSD support for naming threads
* Refined Python support policy

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* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
  target/i386/gdbstub: Fix a bug about order of FPU stack in 'g' packets.
  docs: build-platforms: refine requirements on Python build dependencies
  thread-posix: add support for setting threads name on OpenBSD
  target/i386: Fix 32-bit AD[CO]X insns in 64-bit mode

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>


  Commit: c3aeccc0abe5a8f390a53cfd0a7630603f95b8de
      
https://github.com/qemu/qemu/commit/c3aeccc0abe5a8f390a53cfd0a7630603f95b8de
  Author: Peter Maydell <peter.maydell@linaro.org>
  Date:   2023-02-24 (Fri, 24 Feb 2023)

  Changed paths:
    M .gitlab-ci.d/static_checks.yml
    M python/.gitignore
    M python/Makefile
    R python/Pipfile
    R python/Pipfile.lock
    M python/README.rst
    M python/qemu/qmp/protocol.py
    M python/qemu/qmp/qmp_client.py
    M python/qemu/utils/qemu_ga_client.py
    M python/setup.cfg
    A python/tests/minreqs.txt
    M tests/docker/dockerfiles/python.docker
    M tests/qemu-iotests/iotests.py
    M tests/qemu-iotests/tests/migrate-bitmaps-postcopy-test

  Log Message:
  -----------
  Merge tag 'python-pull-request' of https://gitlab.com/jsnow/qemu into staging

Python

Only minor testing updates.

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# gpg: Signature made Thu 23 Feb 2023 04:36:23 GMT
# gpg:                using RSA key F9B7ABDBBCACDF95BE76CBD07DEF8106AAFC390E
# gpg: Good signature from "John Snow (John Huston) <jsnow@redhat.com>" [full]
# Primary key fingerprint: FAEB 9711 A12C F475 812F  18F2 88A9 064D 1835 61EB
#      Subkey fingerprint: F9B7 ABDB BCAC DF95 BE76  CBD0 7DEF 8106 AAFC 390E

* tag 'python-pull-request' of https://gitlab.com/jsnow/qemu:
  python: drop pipenv
  python: support pylint 2.16

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>


  Commit: 569346ad0a85b370fe28282656da18bddd291ed6
      
https://github.com/qemu/qemu/commit/569346ad0a85b370fe28282656da18bddd291ed6
  Author: Peter Maydell <peter.maydell@linaro.org>
  Date:   2023-02-24 (Fri, 24 Feb 2023)

  Changed paths:
    M docs/devel/qapi-code-gen.rst
    M scripts/qapi/.flake8
    M scripts/qapi/expr.py
    M scripts/qapi/parser.py
    M scripts/qapi/pylintrc
    M scripts/qapi/schema.py

  Log Message:
  -----------
  Merge tag 'pull-qapi-2023-02-23' of https://repo.or.cz/qemu/armbru into 
staging

QAPI patches patches for 2023-02-23

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# gpg: Signature made Thu 23 Feb 2023 12:03:53 GMT
# gpg:                using RSA key 354BC8B3D7EB2A6B68674E5F3870B400EB918653
# gpg:                issuer "armbru@redhat.com"
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>" [full]
# gpg:                 aka "Markus Armbruster <armbru@pond.sub.org>" [full]
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867  4E5F 3870 B400 EB91 8653

* tag 'pull-qapi-2023-02-23' of https://repo.or.cz/qemu/armbru:
  qapi: remove JSON value FIXME
  qapi: remove _JSONObject
  qapi/parser: add QAPIExpression type
  qapi: Add minor typing workaround for 3.6
  qapi: update pylint configuration
  qapi: Update flake8 config
  docs/devel/qapi-code-gen: Fix a missing 'may', clarify SchemaInfo
  docs/devel/qapi-code-gen: Belatedly update features documentation

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>


Compare: https://github.com/qemu/qemu/compare/ed9128c17722...569346ad0a85