chardev: add path option for pty backend

Add path option to the pty char backend which will create a symbolic
link to the given path that points to the allocated PTY.

This avoids having to make QMP

chardev: add path option for pty backend

Add path option to the pty char backend which will create a symbolic
link to the given path that points to the allocated PTY.

This avoids having to make QMP or HMP monitor queries to find out what
the new PTY device path is.

Based on patch from Paulo Neves:

https://patchew.org/QEMU/1548509635-15776-1-git-send-email-ptsneves@gmail.com/

Tested with the following invocations that the link is created and
removed when qemu stops:

qemu-system-x86_64 -nodefaults -mon chardev=compat_monitor \
-chardev pty,path=test,id=compat_monitor0

qemu-system-x86_64 -nodefaults -monitor pty:test

# check QMP invocation with path set
qemu-system-x86_64 -nodefaults -qmp tcp:localhost:4444,server=on,wait=off
nc localhost 4444
> {"execute": "qmp_capabilities"}
> {"execute": "chardev-add", "arguments": {"id": "bar", "backend": {
"type": "pty", "data": {"path": "test" }}}}

# check QMP invocation with path not set
qemu-system-x86_64 -nodefaults -qmp tcp:localhost:4444,server=on,wait=off
nc localhost 4444
> {"execute": "qmp_capabilities"}
> {"execute": "chardev-add", "arguments": {"id": "bar", "backend": {
"type": "pty", "data": {}}}}

Also tested that when a link path is not passed invocations still work, e.g.:

qemu-system-x86_64 -monitor pty

Co-authored-by: Paulo Neves <ptsneves@gmail.com>
Signed-off-by: Paulo Neves <ptsneves@gmail.com>
[OP: rebase and address original patch review comments]
Signed-off-by: Octavian Purdila <tavip@google.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-ID: <20240806010735.2450555-1-tavip@google.com>

show more ...

chardev: introduce 'reconnect-ms' and deprecate 'reconnect'

The 'reconnect' option only allows to specify the time in seconds,
which is way too long for certain workflows.

We have a lightweight dis

chardev: introduce 'reconnect-ms' and deprecate 'reconnect'

The 'reconnect' option only allows to specify the time in seconds,
which is way too long for certain workflows.

We have a lightweight disk backend server, which takes about 20ms to
live update, but due to this limitation in QEMU, previously the guest
disk controller would hang for one second because it would take this
long for QEMU to reinitialize the socket connection.

Introduce a new option called 'reconnect-ms', which is the same as
'reconnect', except the value is treated as milliseconds. These are
mutually exclusive and specifying both results in an error.

'reconnect' is also deprecated by this commit to make it possible to
remove it in the future as to not keep two options that control the
same thing.

Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Acked-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Acked-by: Markus Armbruster <armbru@redhat.com>
Tested-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240913094604.269135-1-d-tatianin@yandex-team.ru>

show more ...

qapi/char: Supply missing member documentation

Since we neglect to document several members of ChardevBackendKind,
their description in the QEMU QMP Reference manual is "Not
documented". Fix that,

qapi/char: Supply missing member documentation

Since we neglect to document several members of ChardevBackendKind,
their description in the QEMU QMP Reference manual is "Not
documented". Fix that, and improve the existing member documentation.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240911112545.2248881-2-armbru@redhat.com>

show more ...

qapi: Refill doc comments to conform to conventions

Sweep the entire documentation again. Last done in commit
209e64d9edf (qapi: Refill doc comments to conform to current
conventions).

To check th

qapi: Refill doc comments to conform to conventions

Sweep the entire documentation again. Last done in commit
209e64d9edf (qapi: Refill doc comments to conform to current
conventions).

To check the generated documentation does not change, I compared the
generated HTML before and after this commit with "wdiff -3". Finds no
differences. Comparing with diff is not useful, as the reflown
paragraphs are visible there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240729065220.860163-1-armbru@redhat.com>
[Straightforward conflict with commit 442110bc6f3 resolved]

show more ...

qapi: convert "Example" sections without titles

Use the no-option form of ".. qmp-example::" to convert any Examples
that do not have any form of caption or explanation whatsoever. Note
that in a fe

qapi: convert "Example" sections without titles

Use the no-option form of ".. qmp-example::" to convert any Examples
that do not have any form of caption or explanation whatsoever. Note
that in a few cases, example sections are split into two or more
separate example blocks. This is only done stylistically to create a
delineation between two or more logically independent examples.

See commit-3: "docs/qapidoc: create qmp-example directive", for a
detailed explanation of this custom directive syntax.

See commit+3: "qapi: remove "Example" doc section" for a detailed
explanation of why.

Note: an empty "TODO" line was added to announce-self to keep the
example from floating up into the body; this will be addressed more
rigorously in the new qapidoc generator.

Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20240717021312.606116-7-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Markup fixed in one place]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

qapi: convert "Note" sections to plain rST

We do not need a dedicated section for notes. By eliminating a specially
parsed section, these notes can be treated as normal rST paragraphs in
the new QMP

qapi: convert "Note" sections to plain rST

We do not need a dedicated section for notes. By eliminating a specially
parsed section, these notes can be treated as normal rST paragraphs in
the new QMP reference manual, and can be placed and styled much more
flexibly.

Convert all existing "Note" and "Notes" sections to pure rST. As part of
the conversion, capitalize the first letter of each sentence and add
trailing punctuation where appropriate to ensure notes look sensible and
consistent in rendered HTML documentation. Markup is also re-aligned to
the de-facto standard of 3 spaces for directives.

Update docs/devel/qapi-code-gen.rst to reflect the new paradigm, and
update the QAPI parser to prohibit "Note" sections while suggesting a
new syntax. The exact formatting to use is a matter of taste, but a good
candidate is simply:

.. note:: lorem ipsum ...
... dolor sit amet ...
... consectetur adipiscing elit ...

... but there are other choices, too. The Sphinx readthedocs theme
offers theming for the following forms (capitalization unimportant); all
are adorned with a (!) symbol () in the title bar for rendered HTML
docs.

See
https://sphinx-rtd-theme.readthedocs.io/en/stable/demo/demo.html#admonitions
for examples of each directive/admonition in use.

These are rendered in orange:

.. Attention:: ...
.. Caution:: ...
.. WARNING:: ...

These are rendered in red:

.. DANGER:: ...
.. Error:: ...

These are rendered in green:

.. Hint:: ...
.. Important:: ...
.. Tip:: ...

These are rendered in blue:

.. Note:: ...
.. admonition:: custom title

admonition body text

This patch uses ".. note::" almost everywhere, with just two "caution"
directives. Several instances of "Notes:" have been converted to
merely ".. note::", or multiple ".. note::" where appropriate.
".. admonition:: notes" is used in a few places where we had an
ordered list of multiple notes that would not make sense as
standalone/separate admonitions. Two "Note:" following "Example:"
have been turned into ordinary paragraphs within the example.

NOTE: Because qapidoc.py does not attempt to preserve source ordering of
sections, the conversion of Notes from a "tagged section" to an
"untagged section" means that rendering order for some notes *may
change* as a result of this patch. The forthcoming qapidoc.py rewrite
strictly preserves source ordering in the rendered documentation, so
this issue will be rectified in the new generator.

Signed-off-by: John Snow <jsnow@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com> [for block*.json]
Message-ID: <20240626222128.406106-11-jsnow@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
[Commit message clarified slightly, period added to one more note]
Signed-off-by: Markus Armbruster <armbru@redhat.com>

show more ...

qapi: Delete useless "Returns" sections

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240227113921.236097-6-armbru@redhat.com>

qapi: Delete useless "Returns" sections

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240227113921.236097-6-armbru@redhat.com>

qapi: Require descriptions and tagged sections to be indented

By convention, we indent the second and subsequent lines of
descriptions and tagged sections, except for examples.

Turn this into a har

qapi: Require descriptions and tagged sections to be indented

By convention, we indent the second and subsequent lines of
descriptions and tagged sections, except for examples.

Turn this into a hard rule, and apply it to examples, too.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240216145841.2099240-11-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
[Straightforward conflicts in qapi/migration.json resolved]

show more ...

qapi/char: Deprecate backend type "memory"

It's an alias for "ringbuf" we kept for backward compatibility; see
commit 3a1da42eb35 (qapi: Rename ChardevBackend member "memory" to
"ringbuf"). Depreca

qapi/char: Deprecate backend type "memory"

It's an alias for "ringbuf" we kept for backward compatibility; see
commit 3a1da42eb35 (qapi: Rename ChardevBackend member "memory" to
"ringbuf"). Deprecation is long overdue.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240203080228.2766159-5-armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

qapi/char: Make backend types properly conditional

Character backends are actually QOM types. When a backend's
compile-time conditional QOM type is not compiled in, creation fails
with "'FOO' is no

qapi/char: Make backend types properly conditional

Character backends are actually QOM types. When a backend's
compile-time conditional QOM type is not compiled in, creation fails
with "'FOO' is not a valid char driver name". Okay, except
introspecting chardev-add with query-qmp-schema doesn't work then: the
backend type is there even though the QOM type isn't.

A management application can work around this issue by using
qom-list-types instead.

Fix the issue anyway: add the conditionals to the QAPI schema.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240203080228.2766159-4-armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

qapi: Add missing union tag documentation

Low-hanging fruit, and except for StatsFilter, the only members of
these unions lacking documentation.

Signed-off-by: Markus Armbruster <armbru@redhat.com>

qapi: Add missing union tag documentation

Low-hanging fruit, and except for StatsFilter, the only members of
these unions lacking documentation.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240205074709.3613229-16-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

show more ...

qapi: Plug trivial documentation holes around former simple unions

The conversion of simple to flat unions left the @data members
undocumented. Add documentation where it's trivial. Copy verbatim

qapi: Plug trivial documentation holes around former simple unions

The conversion of simple to flat unions left the @data members
undocumented. Add documentation where it's trivial. Copy verbatim
from the wrapped type's description where possible.

Leftovers: String (to be taken care of in the next commit), and
TransActionAction (left for another day).

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240205074709.3613229-13-armbru@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

show more ...

qapi: Indent tagged doc comment sections properly

docs/devel/qapi-code-gen demands that the "second and subsequent lines
of sections other than "Example"/"Examples" should be indented".
Commit a937b

qapi: Indent tagged doc comment sections properly

docs/devel/qapi-code-gen demands that the "second and subsequent lines
of sections other than "Example"/"Examples" should be indented".
Commit a937b6aa739 (qapi: Reformat doc comments to conform to current
conventions) missed a few instances, and a few more have crept in
since. Indent them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240120095327.666239-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

qapi: Indent tagged doc comment sections properly

docs/devel/qapi-code-gen demands that the "second and subsequent lines
of sections other than "Example"/"Examples" should be indented".
Commit a937b

qapi: Indent tagged doc comment sections properly

docs/devel/qapi-code-gen demands that the "second and subsequent lines
of sections other than "Example"/"Examples" should be indented".
Commit a937b6aa739 (qapi: Reformat doc comments to conform to current
conventions) missed a few instances, and a few more have crept in
since. Indent them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240120095327.666239-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

qapi: Indent tagged doc comment sections properly

docs/devel/qapi-code-gen demands that the "second and subsequent lines
of sections other than "Example"/"Examples" should be indented".
Commit a937b

qapi: Indent tagged doc comment sections properly

docs/devel/qapi-code-gen demands that the "second and subsequent lines
of sections other than "Example"/"Examples" should be indented".
Commit a937b6aa739 (qapi: Reformat doc comments to conform to current
conventions) missed a few instances, and a few more have crept in
since. Indent them.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20240120095327.666239-7-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>

show more ...

ui/vc: do not parse VC-specific options in Spice and GTK

In commit 6f974c843c ("gtk: overwrite the console.c char driver"), I
shared the VC console parse handler with GTK. And later on in commit
d8a

ui/vc: do not parse VC-specific options in Spice and GTK

In commit 6f974c843c ("gtk: overwrite the console.c char driver"), I
shared the VC console parse handler with GTK. And later on in commit
d8aec9d9 ("display: add -display spice-app launching a Spice client"),
I also used it to handle spice-app VC.

This is not necessary, the VC console options (width/height/cols/rows)
are specific, and unused by tty-level GTK/Spice VC.

This is not a breaking change, as those options are still being parsed
by QAPI ChardevVC. Adjust the documentation about it.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230830093843.3531473-44-marcandre.lureau@redhat.com>

show more ...

ui/vc: do not parse VC-specific options in Spice and GTK

In commit 6f974c843c ("gtk: overwrite the console.c char driver"), I
shared the VC console parse handler with GTK. And later on in commit
d8a

ui/vc: do not parse VC-specific options in Spice and GTK

In commit 6f974c843c ("gtk: overwrite the console.c char driver"), I
shared the VC console parse handler with GTK. And later on in commit
d8aec9d9 ("display: add -display spice-app launching a Spice client"),
I also used it to handle spice-app VC.

This is not necessary, the VC console options (width/height/cols/rows)
are specific, and unused by tty-level GTK/Spice VC.

This is not a breaking change, as those options are still being parsed
by QAPI ChardevVC. Adjust the documentation about it.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20230830093843.3531473-44-marcandre.lureau@redhat.com>

show more ...

qapi: Correct "eg." to "e.g." in documentation

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

qapi: Correct "eg." to "e.g." in documentation

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

qapi: Correct "eg." to "e.g." in documentation

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

qapi: Reformat doc comments to conform to current conventions

Change

# @name: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
# do eiusmod tempor incididunt ut labore et

qapi: Reformat doc comments to conform to current conventions

Change

# @name: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
# do eiusmod tempor incididunt ut labore et dolore magna aliqua.

to

# @name: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
# do eiusmod tempor incididunt ut labore et dolore magna aliqua.

See recent commit "qapi: Relax doc string @name: description
indentation rules" for rationale.

Reflow paragraphs to 70 columns width, and consistently use two spaces
to separate sentences.

To check the generated documentation does not change, I compared the
generated HTML before and after this commit with "wdiff -3". Finds no
differences. Comparing with diff is not useful, as the reflown
paragraphs are visible there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230428105429.1687850-18-armbru@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Acked-by: Lukas Straub <lukasstraub2@web.de>
[Straightforward conflicts in qapi/audio.json qapi/misc-target.json
qapi/run-state.json resolved]

show more ...

qapi: Tidy up examples

A few examples neglect to prefix QMP input with '->'. Fix that.

Two examples have extra space after '<-'. Delete it.

A few examples neglect to show output. Provide some.

qapi: Tidy up examples

A few examples neglect to prefix QMP input with '->'. Fix that.

Two examples have extra space after '<-'. Delete it.

A few examples neglect to show output. Provide some. The example
output for query-vcpu-dirty-limit could use further improvement. Add
a TODO comment.

Use "Examples:" instead of "Example:" where multiple examples are
given.

One example section numbers its two examples. Not done elsewhere;
drop.

Another example section separates them with "or". Likewise.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230425064223.820979-8-armbru@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>

show more ...

qapi: Reformat doc comments to conform to current conventions

Change

# @name: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
# do eiusmod tempor incididunt ut labore et

qapi: Reformat doc comments to conform to current conventions

Change

# @name: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
# do eiusmod tempor incididunt ut labore et dolore magna aliqua.

to

# @name: Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed
# do eiusmod tempor incididunt ut labore et dolore magna aliqua.

See recent commit "qapi: Relax doc string @name: description
indentation rules" for rationale.

Reflow paragraphs to 70 columns width, and consistently use two spaces
to separate sentences.

To check the generated documentation does not change, I compared the
generated HTML before and after this commit with "wdiff -3". Finds no
differences. Comparing with diff is not useful, as the reflown
paragraphs are visible there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20230428105429.1687850-18-armbru@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Acked-by: Lukas Straub <lukasstraub2@web.de>
[Straightforward conflicts in qapi/audio.json qapi/misc-target.json
qapi/run-state.json resolved]

show more ...

qapi: Tidy up examples

A few examples neglect to prefix QMP input with '->'. Fix that.

Two examples have extra space after '<-'. Delete it.

A few examples neglect to show output. Provide some.

qapi: Tidy up examples

A few examples neglect to prefix QMP input with '->'. Fix that.

Two examples have extra space after '<-'. Delete it.

A few examples neglect to show output. Provide some. The example
output for query-vcpu-dirty-limit could use further improvement. Add
a TODO comment.

Use "Examples:" instead of "Example:" where multiple examples are
given.

One example section numbers its two examples. Not done elsewhere;
drop.

Another example section separates them with "or". Likewise.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230425064223.820979-8-armbru@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>

show more ...