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Subject[PATCH v3 13/16] target-s390x: New QMP command query-cpu-model
Date
This patch implements a new QMP request named 'query-cpu-model'.
It returns the cpu model of cpu 0 and its backing accelerator.

request:
{"execute" : "query-cpu-model" }

answer:
{"return" : {"name": "2827-ga2", "accelerator": "kvm" }}

Alias names are resolved to their respective machine type and GA names
already during cpu instantiation. Thus, also a cpu model like 'host'
which is implemented as alias will return its normalized cpu model name.

Furthermore the patch implements the following functions:

- s390_cpu_typename(), returns the currently selected cpu type name or NULL
- s390_cpu_models_used(), returns true if S390 cpu models are in use

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
---
include/sysemu/arch_init.h | 1 +
qapi-schema.json | 25 +++++++++++++++++++++++++
qmp-commands.hx | 6 ++++++
qmp.c | 5 +++++
stubs/Makefile.objs | 1 +
stubs/arch-query-cpu-mod.c | 9 +++++++++
target-s390x/cpu-models.c | 13 +++++++++++++
target-s390x/cpu-models.h | 1 +
target-s390x/cpu.c | 29 +++++++++++++++++++++++++++++
9 files changed, 90 insertions(+)
create mode 100644 stubs/arch-query-cpu-mod.c

diff --git a/include/sysemu/arch_init.h b/include/sysemu/arch_init.h
index 54b36c1..86344a2 100644
--- a/include/sysemu/arch_init.h
+++ b/include/sysemu/arch_init.h
@@ -37,5 +37,6 @@ int kvm_available(void);
int xen_available(void);

CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp);
+CpuModelInfo *arch_query_cpu_model(Error **errp);

#endif
diff --git a/qapi-schema.json b/qapi-schema.json
index ea436ec..e9b213f 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -2507,6 +2507,31 @@
##
{ 'command': 'query-cpu-definitions', 'returns': ['CpuDefinitionInfo'] }

+##
+# @CpuModelInfo:
+#
+# Virtual CPU model definition.
+#
+# @name: the name of the CPU model definition
+#
+# @accelerator: AccelId (name) of this cpu models acceletaror
+#
+# Since: 2.3
+##
+{ 'type': 'CpuModelInfo',
+ 'data': { 'name': 'str', 'accelerator': 'AccelId' } }
+
+##
+# @query-cpu-model:
+#
+# Return the current virtual CPU model
+#
+# Returns: CpuModelInfo
+#
+# Since: 2.3
+##
+{ 'command': 'query-cpu-model', 'returns': 'CpuModelInfo' }
+
# @AddfdInfo:
#
# Information about a file descriptor that was added to an fd set.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index a85d847..98bfedd 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -3392,6 +3392,12 @@ EQMP
},

{
+ .name = "query-cpu-model",
+ .args_type = "",
+ .mhandler.cmd_new = qmp_marshal_input_query_cpu_model,
+ },
+
+ {
.name = "query-target",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_target,
diff --git a/qmp.c b/qmp.c
index d701cff..11b6172 100644
--- a/qmp.c
+++ b/qmp.c
@@ -573,6 +573,11 @@ CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
return arch_query_cpu_definitions(errp);
}

+CpuModelInfo *qmp_query_cpu_model(Error **errp)
+{
+ return arch_query_cpu_model(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 fd7a489..45daa92 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -1,4 +1,5 @@
stub-obj-y += arch-query-cpu-def.o
+stub-obj-y += arch-query-cpu-mod.o
stub-obj-y += bdrv-commit-all.o
stub-obj-y += chr-baum-init.o
stub-obj-y += chr-msmouse.o
diff --git a/stubs/arch-query-cpu-mod.c b/stubs/arch-query-cpu-mod.c
new file mode 100644
index 0000000..90ebd08
--- /dev/null
+++ b/stubs/arch-query-cpu-mod.c
@@ -0,0 +1,9 @@
+#include "qemu-common.h"
+#include "sysemu/arch_init.h"
+#include "qapi/qmp/qerror.h"
+
+CpuModelInfo *arch_query_cpu_model(Error **errp)
+{
+ error_set(errp, QERR_UNSUPPORTED);
+ return NULL;
+}
diff --git a/target-s390x/cpu-models.c b/target-s390x/cpu-models.c
index c6c1771..116dbcc 100644
--- a/target-s390x/cpu-models.c
+++ b/target-s390x/cpu-models.c
@@ -670,3 +670,16 @@ void s390_cpu_model_init(S390CPUClass *cc)
}
}

+/**
+ * s390_cpu_models_used:
+ *
+ * This function indicates if cpus with model properties are in use.
+ *
+ * Returns: a boolean value.
+ *
+ * Since: 2.3
+ */
+bool s390_cpu_models_used(void)
+{
+ return cpu_models_used;
+}
diff --git a/target-s390x/cpu-models.h b/target-s390x/cpu-models.h
index f3f914a..51db298 100644
--- a/target-s390x/cpu-models.h
+++ b/target-s390x/cpu-models.h
@@ -114,6 +114,7 @@ void s390_cpu_list_entry(gpointer data, gpointer user_data);
bool s390_cpu_classes_initialized(void);
bool s390_probe_mode(void);
void s390_cpu_model_init(S390CPUClass *cc);
+bool s390_cpu_models_used(void);

/*
* bits 0-7 : CMOS generation
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index 2f4192e..cefaff1 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -37,6 +37,11 @@
#define CR0_RESET 0xE0UL
#define CR14_RESET 0xC2000000UL;

+static inline char *strdup_s390_cpu_name(S390CPUClass *cc)
+{
+ return g_strdup_printf("%04x-ga%u", cc->proc.type, cc->mach.ga);
+}
+
/* generate CPU information for cpu -? */
void s390_cpu_list(FILE *f, fprintf_function cpu_fprintf)
{
@@ -74,6 +79,30 @@ CpuDefinitionInfoList *arch_query_cpu_definitions(Error **errp)

return entry;
}
+
+CpuModelInfo *arch_query_cpu_model(Error **errp)
+{
+ CpuModelInfo *info;
+ S390CPUClass *cc;
+
+ if (!s390_cpu_models_used()) {
+ return NULL;
+ }
+ info = g_try_new0(CpuModelInfo, 1);
+ if (!info) {
+ return NULL;
+ }
+ cc = S390_CPU_GET_CLASS(s390_cpu_addr2state(0));
+ info->name = strdup_s390_cpu_name(cc);
+ if (!info->name) {
+ g_free(info);
+ return NULL;
+ }
+ if (kvm_enabled()) {
+ info->accelerator = ACCEL_ID_KVM;
+ }
+ return info;
+}
#endif

static void s390_cpu_set_pc(CPUState *cs, vaddr value)
--
1.8.3.1


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