[PATCH v8 0/4] compare machine type compat_props

[Maksim Davydov <davydov-max@yandex-team.ru>]

This script can be used to choose the best machine type in the
appropriate cases. Also we have to check compat_props of the old MT
after changes to be sure that they haven't broken old the MT. For
example, pc_compat_3_1 of pc-q35-3.1 has Icelake-Client which was
removed.

v8 -> v7:
* rebase
* fix encoding

v7 -> v6:
* minor fixes

v6 -> v5:
* add ability to compare different QEMU binaries
* replace abstract drivers by its implementations
* improve human-readable format
* code refactoring

v5 -> v4:
* minor fixes

v4 -> v3:
* increase read buffer limit to limit value in libvirt
* add caching of qmp requests to speed up the script 

v3 -> v2:
* simplify adding new methods for getting QEMU default values
* add typing
* change concept from fixed dictionaries to classes

v2 -> v1:
* fix script code style and descriptions
* reorder patches
 
v1 -> previous iteration:
* new default value print concept
* QEMU python library is used to collect qmp data
* remove auxiliary patches (that was used to fix `->get` sematics)
* print compat_props in the correct order
* delete `absract` field to reduce output JSON size


Maksim Davydov (4):
  qom: qom-list-properties: add default value
  qmp: add dump machine type compatibility properties
  python/qemu/machine: add method to retrieve QEMUMachine::binary field
  scripts: add script to compare compatibility properties

 hw/core/machine-qmp-cmds.c       |  23 +-
 python/qemu/machine/machine.py   |   5 +
 qapi/machine.json                |  64 +++-
 qom/qom-qmp-cmds.c               |   1 +
 scripts/compare-machine-types.py | 486 +++++++++++++++++++++++++++++++
 tests/qtest/fuzz/qos_fuzz.c      |   2 +-
 6 files changed, 577 insertions(+), 4 deletions(-)
 create mode 100755 scripts/compare-machine-types.py

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2.34.1