[libvirt] [PATCH for-2.9 17/17] target-i386: Implement query-cpu-model-expansion QMP command
Eduardo Habkost
ehabkost at redhat.com
Fri Dec 2 21:18:16 UTC 2016
Implement query-cpu-model-expansion for target-i386.
The code needs to be careful to handle non-migration-safe
features ("pmu" and "host-cache-info") according to the expansion
type.
Cc: libvir-list at redhat.com
Cc: Jiri Denemark <jdenemar at redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost at redhat.com>
---
tests/Makefile.include | 3 +
monitor.c | 4 +-
target-i386/cpu.c | 195 ++++++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 200 insertions(+), 2 deletions(-)
diff --git a/tests/Makefile.include b/tests/Makefile.include
index 63c4347..c7bbfca 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -251,6 +251,9 @@ check-qtest-x86_64-y += $(check-qtest-i386-y)
gcov-files-i386-y += i386-softmmu/hw/timer/mc146818rtc.c
gcov-files-x86_64-y = $(subst i386-softmmu/,x86_64-softmmu/,$(gcov-files-i386-y))
+check-simpleqtest-x86_64-y += $(SRC_PATH)/tests/query-cpu-model-test.py
+check-simpleqtest-i386-y += $(SRC_PATH)/tests/query-cpu-model-test.py
+
check-qtest-alpha-y = tests/boot-serial-test$(EXESUF)
check-qtest-mips-y = tests/endianness-test$(EXESUF)
diff --git a/monitor.c b/monitor.c
index 0841d43..90c12b3 100644
--- a/monitor.c
+++ b/monitor.c
@@ -983,8 +983,10 @@ static void qmp_unregister_commands_hack(void)
#ifndef TARGET_ARM
qmp_unregister_command("query-gic-capabilities");
#endif
-#if !defined(TARGET_S390X)
+#if !defined(TARGET_S390X) && !defined(TARGET_I386)
qmp_unregister_command("query-cpu-model-expansion");
+#endif
+#if !defined(TARGET_S390X)
qmp_unregister_command("query-cpu-model-baseline");
qmp_unregister_command("query-cpu-model-comparison");
#endif
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index bf4ac09..198014a 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -29,10 +29,14 @@
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qapi/qmp/qerror.h"
+#include "qapi/qmp/qstring.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qbool.h"
#include "qapi-types.h"
#include "qapi-visit.h"
#include "qapi/visitor.h"
+#include "qom/qom-qobject.h"
#include "sysemu/arch_init.h"
#if defined(CONFIG_KVM)
@@ -2259,7 +2263,7 @@ static void x86_cpu_apply_props(X86CPU *cpu, PropValue *props)
}
}
-/* Load data from X86CPUDefinition
+/* Load data from X86CPUDefinition into a X86CPU object
*/
static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
{
@@ -2268,6 +2272,11 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
char host_vendor[CPUID_VENDOR_SZ + 1];
FeatureWord w;
+ /*NOTE: any property set by this function should be returned by
+ * x86_cpu_to_dict(), so CPU model data returned by
+ * query-cpu-model-expansion is always complete.
+ */
+
/* CPU models only set _minimum_ values for level/xlevel: */
object_property_set_int(OBJECT(cpu), def->level, "min-level", errp);
object_property_set_int(OBJECT(cpu), def->xlevel, "min-xlevel", errp);
@@ -2312,6 +2321,190 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
}
+/* Convert CPU model data from X86CPU object to a property dictionary
+ * that can recreate exactly the same CPU model.
+ *
+ * This function does the opposite of x86_cpu_load_def(). Any
+ * property changed by x86_cpu_load_def() or instance_init
+ * methods should be returned by this function too.
+ */
+static void x86_cpu_to_dict(X86CPU *cpu, QDict *props, Error **errp)
+{
+ Object *obj = OBJECT(cpu);
+ FeatureWord w;
+ PropValue *pv;
+
+ /* This code could simply iterate over all writeable properties in the
+ * CPU object, and return all of them. But then the aliases properties
+ * would be returned as well. Returning only the known features
+ * is more reliable.
+ */
+ qdict_put_obj(props, "min-level",
+ object_property_get_qobject(obj, "min-level", errp));
+ qdict_put_obj(props, "min-xlevel",
+ object_property_get_qobject(obj, "min-xlevel", errp));
+
+ qdict_put_obj(props, "family",
+ object_property_get_qobject(obj, "family", errp));
+ qdict_put_obj(props, "model",
+ object_property_get_qobject(obj, "model", errp));
+ qdict_put_obj(props, "stepping",
+ object_property_get_qobject(obj, "stepping", errp));
+ qdict_put_obj(props, "model-id",
+ object_property_get_qobject(obj, "model-id", errp));
+
+ for (w = 0; w < FEATURE_WORDS; w++) {
+ FeatureWordInfo *fi = &feature_word_info[w];
+ int bit;
+ for (bit = 0; bit < 32; bit++) {
+ if (!fi->feat_names[bit]) {
+ continue;
+ }
+ qdict_put_obj(props, fi->feat_names[bit],
+ object_property_get_qobject(obj, fi->feat_names[bit],
+ errp));
+ }
+ }
+
+ for (pv = kvm_default_props; pv->prop; pv++) {
+ qdict_put_obj(props, pv->prop,
+ object_property_get_qobject(obj, pv->prop, errp));
+ }
+ for (pv = tcg_default_props; pv->prop; pv++) {
+ qdict_put_obj(props, pv->prop,
+ object_property_get_qobject(obj, pv->prop, errp));
+ }
+
+ qdict_put_obj(props, "vendor",
+ object_property_get_qobject(obj, "vendor", errp));
+
+ /* Set by "host": */
+ qdict_put_obj(props, "lmce",
+ object_property_get_qobject(obj, "lmce", errp));
+ qdict_put_obj(props, "pmu",
+ object_property_get_qobject(obj, "pmu", errp));
+
+
+ /* Other properties configurable by the user: */
+ qdict_put_obj(props, "host-cache-info",
+ object_property_get_qobject(obj, "host-cache-info", errp));
+}
+
+static void object_apply_props(Object *obj, QDict *props, Error **errp)
+{
+ const QDictEntry *prop;
+ Error *err = NULL;
+
+ for (prop = qdict_first(props); prop; prop = qdict_next(props, prop)) {
+ object_property_set_qobject(obj, qdict_entry_value(prop),
+ qdict_entry_key(prop), &err);
+ if (err) {
+ break;
+ }
+ }
+
+ error_propagate(errp, err);
+}
+
+static X86CPU *x86_cpu_from_model(CpuModelInfo *model, Error **errp)
+{
+ X86CPU *xc = NULL;
+ X86CPUClass *xcc;
+ Error *err = NULL;
+
+ xcc = X86_CPU_CLASS(cpu_class_by_name(TYPE_X86_CPU, model->name));
+ if (xcc == NULL) {
+ error_setg(&err, "CPU model '%s' not found", model->name);
+ goto out;
+ }
+
+ xc = X86_CPU(object_new(object_class_get_name(OBJECT_CLASS(xcc))));
+ if (model->has_props) {
+ QDict *d = qobject_to_qdict(model->props);
+ if (!d) {
+ error_setg(&err, "model.props must be a dictionary");
+ goto out;
+ }
+ object_apply_props(OBJECT(xc), d, &err);
+ if (err) {
+ goto out;
+ }
+ }
+
+ x86_cpu_expand_features(xc, &err);
+ if (err) {
+ goto out;
+ }
+
+out:
+ if (err) {
+ error_propagate(errp, err);
+ object_unref(OBJECT(xc));
+ xc = NULL;
+ }
+ return xc;
+}
+
+CpuModelExpansionInfo *arch_query_cpu_model_expansion(CpuModelExpansionType type,
+ CpuModelInfo *model,
+ Error **errp)
+{
+ X86CPU *xc = NULL;
+ Error *err = NULL;
+ CpuModelExpansionInfo *ret = g_new0(CpuModelExpansionInfo, 1);
+ QDict *props;
+
+ xc = x86_cpu_from_model(model, &err);
+ if (err) {
+ goto out;
+ }
+
+ /* We currently always do full expansion */
+ ret->model = g_new0(CpuModelInfo, 1);
+ ret->model->name = g_strdup("base"); /* the only static model */
+ props = qdict_new();
+ ret->model->props = QOBJECT(props);
+ ret->model->has_props = true;
+ x86_cpu_to_dict(xc, props, &err);
+
+ /* Some features (pmu, host-cache-info) are not migration-safe,
+ * and are handled differently depending on expansion type:
+ */
+ if (type == CPU_MODEL_EXPANSION_TYPE_STATIC) {
+ /* static expansion force migration-unsafe features off: */
+ ret->q_static = ret->migration_safe = true;
+ qdict_del(props, "pmu");
+ qdict_del(props, "host-cache-info");
+ } else if (type == CPU_MODEL_EXPANSION_TYPE_FULL) {
+ QObject *o;
+ /* full expansion clear the static/migration-safe flags
+ * to indicate migration-unsafe features are on:
+ */
+ ret->q_static = true;
+ ret->migration_safe = true;
+
+ o = qdict_get(props, "pmu");
+ if (o && qbool_get_bool(qobject_to_qbool(o))) {
+ ret->q_static = ret->migration_safe = false;
+ }
+ o = qdict_get(props, "host-cache-info");
+ if (o && qbool_get_bool(qobject_to_qbool(o))) {
+ ret->q_static = ret->migration_safe = false;
+ }
+ } else {
+ error_setg(&err, "The requested expansion type is not supported.");
+ }
+
+out:
+ object_unref(OBJECT(xc));
+ if (err) {
+ error_propagate(errp, err);
+ qapi_free_CpuModelExpansionInfo(ret);
+ ret = NULL;
+ }
+ return ret;
+}
+
X86CPU *cpu_x86_init(const char *cpu_model)
{
return X86_CPU(cpu_generic_init(TYPE_X86_CPU, cpu_model));
--
2.7.4
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