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docs/devel: document expectations for HMP commands in the future

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We no longer wish to have commands implemented in HMP only. All commands
should start with a QMP implementation and the HMP merely be a shim
around this. To reduce the burden of implementing QMP commands where
there is low expectation of machine usage, requirements for QAPI
modelling are relaxed provided the command is under the "x-" name
prefix.

Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-09-09 17:01:34 +01:00
parent a45cfcbb01
commit 3d312f417d
1 changed files with 8 additions and 0 deletions
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docs/devel/writing-monitor-commands.rst
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@ -11,6 +11,14 @@ For an in-depth introduction to the QAPI framework, please refer to
docs/devel/qapi-code-gen.txt. For documentation about the QMP protocol,
start with docs/interop/qmp-intro.txt.
New commands may be implemented in QMP only. New HMP commands should be
implemented on top of QMP. The typical HMP command wraps around an
equivalent QMP command, but HMP convenience commands built from QMP
building blocks are also fine. The long term goal is to make all
existing HMP commands conform to this, to fully isolate HMP from the
internals of QEMU. Refer to the `Writing a debugging aid returning
unstructured text`_ section for further guidance on commands that
would have traditionally been HMP only.
Overview
--------