Let's provide a standardized interface to baseline two CPU models, to
create a third, compatible one. This is especially helpful when two
CPU models are not identical, but a CPU model is required that is
guaranteed to run under both configurations, where the original models run.
"query-cpu-model-baseline" takes two CPU models and returns a third,
compatible model. The result will always be a static CPU model.
Acked-by: Cornelia Huck <cornelia.h...@de.ibm.com>
Signed-off-by: David Hildenbrand <d...@linux.vnet.ibm.com>
---
include/sysemu/arch_init.h | 3 +++
qapi-schema.json | 51 +++++++++++++++++++++++++++++++++++
qmp-commands.hx | 6 +++++
qmp.c | 7 +++++
stubs/Makefile.objs | 1 +
stubs/arch-query-cpu-model-baseline.c | 12 +++++++++
6 files changed, 80 insertions(+)
create mode 100644 stubs/arch-query-cpu-model-baseline.c
diff --git a/include/sysemu/arch_init.h b/include/sysemu/arch_init.h
index 96d47c0..1c9dad1 100644
--- a/include/sysemu/arch_init.h
+++ b/include/sysemu/arch_init.h
@@ -41,5 +41,8 @@ CpuModelExpansionInfo
*arch_query_cpu_model_expansion(CpuModelExpansionType type
CpuModelCompareInfo *arch_query_cpu_model_comparison(CpuModelInfo *modela,
CpuModelInfo *modelb,
Error **errp);
+CpuModelBaselineInfo *arch_query_cpu_model_baseline(CpuModelInfo *modela,
+ CpuModelInfo *modelb,
+ Error **errp);
#endif
diff --git a/qapi-schema.json b/qapi-schema.json
index 4f1b9ec..7f469d0 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3244,6 +3244,57 @@
'data': { 'modela': 'CpuModelInfo', 'modelb': 'CpuModelInfo' },
'returns': 'CpuModelCompareInfo' }
+##
+# @CpuModelBaselineInfo
+#
+# The result of a CPU model baseline.
+#
+# @model: the baselined CpuModelInfo.
+#
+# Since: 2.8.0
+##
+{ 'struct': 'CpuModelBaselineInfo',
+ 'data': { 'model': 'CpuModelInfo' } }
+
+##
+# @query-cpu-model-baseline:
+#
+# Baseline two CPU models, creating a compatible third model. The created
+# model will always be a static, migration-safe CPU model (see "static"
+# CPU model expansion for details).
+#
+# This interface can be used by tooling to create a compatible CPU model out
+# two CPU models. The created CPU model will be identical to or a subset of
+# both CPU models when comparing them. Therefore, the created CPU model is
+# guaranteed to run where the given CPU models run.
+#
+# The result returned by this command may be affected by:
+#
+# * QEMU version: CPU models may look different depending on the QEMU version.
+# (Except for CPU models reported as "static" in query-cpu-definitions.)
+# * machine-type: CPU model may look different depending on the machine-type.
+# (Except for CPU models reported as "static" in query-cpu-definitions.)
+# * machine options (including accelerator): in some architectures, CPU models
+# may look different depending on machine and accelerator options. (Except
for
+# CPU models reported as "static" in query-cpu-definitions.)
+# * "-cpu" arguments and global properties: arguments to the -cpu option and
+# global properties may affect expansion of CPU models. Using
+# query-cpu-model-expansion while using these is not advised.
+#
+# Some architectures may not support baselining CPU models.
+#
+# Returns: a CpuModelBaselineInfo. Returns an error if baselining CPU models is
+# not supported, if a model cannot be used, if a model contains
+# an unknown cpu definition name, unknown properties or properties
+# with wrong types.
+#
+# Since: 2.8.0
+##
+{ 'command': 'query-cpu-model-baseline',
+ 'data': { 'modela': 'CpuModelInfo',
+ 'modelb': 'CpuModelInfo' },
+ 'returns': 'CpuModelBaselineInfo' }
+
# @AddfdInfo:
#
# Information about a file descriptor that was added to an fd set.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 0af2098..8abccb9 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3954,6 +3954,12 @@ EQMP
},
{
+ .name = "query-cpu-model-baseline",
+ .args_type = "modela:q,modelb:q",
+ .mhandler.cmd_new = qmp_marshal_query_cpu_model_baseline,
+ },
+
+ {
.name = "query-target",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_query_target,
diff --git a/qmp.c b/qmp.c
index f551019..dea8f81 100644
--- a/qmp.c
+++ b/qmp.c
@@ -621,6 +621,13 @@ CpuModelCompareInfo
*qmp_query_cpu_model_comparison(CpuModelInfo *modela,
return arch_query_cpu_model_comparison(modela, modelb, errp);
}
+CpuModelBaselineInfo *qmp_query_cpu_model_baseline(CpuModelInfo *modela,
+ CpuModelInfo *modelb,
+ Error **errp)
+{
+ return arch_query_cpu_model_baseline(modela, modelb, errp);
+}
+
void qmp_add_client(const char *protocol, const char *fdname,
bool has_skipauth, bool skipauth, bool has_tls, bool tls,
Error **errp)
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index da768f0..c5850e8 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -1,6 +1,7 @@
stub-obj-y += arch-query-cpu-def.o
stub-obj-y += arch-query-cpu-model-expansion.o
stub-obj-y += arch-query-cpu-model-comparison.o
+stub-obj-y += arch-query-cpu-model-baseline.o
stub-obj-y += bdrv-next-monitor-owned.o
stub-obj-y += blk-commit-all.o
stub-obj-y += blockdev-close-all-bdrv-states.o
diff --git a/stubs/arch-query-cpu-model-baseline.c
b/stubs/arch-query-cpu-model-baseline.c
new file mode 100644
index 0000000..094ec13
--- /dev/null
+++ b/stubs/arch-query-cpu-model-baseline.c
@@ -0,0 +1,12 @@
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "sysemu/arch_init.h"
+#include "qapi/qmp/qerror.h"
+
+CpuModelBaselineInfo *arch_query_cpu_model_baseline(CpuModelInfo *modela,
+ CpuModelInfo *modelb,
+ Error **errp)
+{
+ error_setg(errp, QERR_UNSUPPORTED);
+ return NULL;
+}
--
2.6.6
