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target/arm/monitor: Introduce qmp_query_cpu_model_expansion

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Add support for the query-cpu-model-expansion QMP command to Arm. We
do this selectively, only exposing CPU properties which represent
optional CPU features which the user may want to enable/disable.
Additionally we restrict the list of queryable cpu models to 'max',
'host', or the current type when KVM is in use. And, finally, we only
implement expansion type 'full', as Arm does not yet have a "base"
CPU type. More details and example queries are described in a new
document (docs/arm-cpu-features.rst).

Note, certainly more features may be added to the list of advertised
features, e.g. 'vfp' and 'neon'. The only requirement is that we can
detect invalid configurations and emit failures at QMP query time.
For 'vfp' and 'neon' this will require some refactoring to share a
validation function between the QMP query and the CPU realize
functions.

Signed-off-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Beata Michalska <beata.michalska@linaro.org>
Message-id: 20191031142734.8590-2-drjones@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Andrew Jones 2019-10-31 15:27:26 +01:00 • committed by Peter Maydell
parent b7c9a7f353
commit e19afd5667
3 changed files with 286 additions and 3 deletions
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6
qapi/machine-target.json
View file

@ -212,7 +212,7 @@
##
{ 'struct': 'CpuModelExpansionInfo',
'data': { 'model': 'CpuModelInfo' },
'if': 'defined(TARGET_S390X) || defined(TARGET_I386)' }
'if': 'defined(TARGET_S390X) || defined(TARGET_I386) || defined(TARGET_ARM)' }
##
# @query-cpu-model-expansion:
@ -237,7 +237,7 @@
# query-cpu-model-expansion while using these is not advised.
#
# Some architectures may not support all expansion types. s390x supports
# "full" and "static".
# "full" and "static". Arm only supports "full".
#
# Returns: a CpuModelExpansionInfo. Returns an error if expanding CPU models is
# not supported, if the model cannot be expanded, if the model contains
@ -251,7 +251,7 @@
'data': { 'type': 'CpuModelExpansionType',
'model': 'CpuModelInfo' },
'returns': 'CpuModelExpansionInfo',
'if': 'defined(TARGET_S390X) || defined(TARGET_I386)' }
'if': 'defined(TARGET_S390X) || defined(TARGET_I386) || defined(TARGET_ARM)' }
##
# @CpuDefinitionInfo: