qemu_monitor: implement query-cpu-model-baseline

Interfaces with QEMU to baseline CPU models. The command takes two
CPU models, A and B, that are given a model name and an optional list
of CPU features. Through the query-cpu-model-baseline command issued
via QMP, a result is produced that contains a new baselined CPU model
that is guaranteed to run on both A and B.

Signed-off-by: Collin Walling <walling@linux.ibm.com>
Reviewed-by: Daniel Henrique Barboza <danielh413@gmail.com>
Message-Id: <1568924706-2311-8-git-send-email-walling@linux.ibm.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_monitor.c

@@ -3561,6 +3561,20 @@ qemuMonitorGetCPUModelExpansion(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorGetCPUModelBaseline(qemuMonitorPtr mon,
+                               virCPUDefPtr cpu_a,
+                               virCPUDefPtr cpu_b,
+                               qemuMonitorCPUModelInfoPtr *baseline)
+{
+    VIR_DEBUG("cpu_a=%p cpu_b=%p", cpu_a, cpu_b);
+
+    QEMU_CHECK_MONITOR(mon);
+
+    return qemuMonitorJSONGetCPUModelBaseline(mon, cpu_a, cpu_b, baseline);
+}
+
+
 void
 qemuMonitorCPUModelInfoFree(qemuMonitorCPUModelInfoPtr model_info)
 {

src/qemu/qemu_monitor.h

@@ -1153,6 +1153,11 @@ int qemuMonitorGetCPUModelExpansion(qemuMonitorPtr mon,
 
 void qemuMonitorCPUModelInfoFree(qemuMonitorCPUModelInfoPtr model_info);
 
+int qemuMonitorGetCPUModelBaseline(qemuMonitorPtr mon,
+                                   virCPUDefPtr cpu_a,
+                                   virCPUDefPtr cpu_b,
+                                   qemuMonitorCPUModelInfoPtr *baseline);
+
 qemuMonitorCPUModelInfoPtr
 qemuMonitorCPUModelInfoCopy(const qemuMonitorCPUModelInfo *orig);
 

src/qemu/qemu_monitor_json.c

@@ -5877,6 +5877,48 @@ qemuMonitorJSONGetCPUModelExpansion(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorJSONGetCPUModelBaseline(qemuMonitorPtr mon,
+                                   virCPUDefPtr cpu_a,
+                                   virCPUDefPtr cpu_b,
+                                   qemuMonitorCPUModelInfoPtr *baseline)
+{
+    VIR_AUTOPTR(virJSONValue) model_a = NULL;
+    VIR_AUTOPTR(virJSONValue) model_b = NULL;
+    VIR_AUTOPTR(virJSONValue) cmd = NULL;
+    VIR_AUTOPTR(virJSONValue) reply = NULL;
+    virJSONValuePtr data;
+    virJSONValuePtr cpu_model;
+    virJSONValuePtr cpu_props = NULL;
+    const char *cpu_name = "";
+
+    if (!(model_a = qemuMonitorJSONMakeCPUModel(cpu_a, true)) ||
+        !(model_b = qemuMonitorJSONMakeCPUModel(cpu_b, true)))
+        return -1;
+
+    if (!(cmd = qemuMonitorJSONMakeCommand("query-cpu-model-baseline",
+                                           "a:modela", &model_a,
+                                           "a:modelb", &model_b,
+                                           NULL)))
+        return -1;
+
+    if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
+        return -1;
+
+    if (qemuMonitorJSONCheckReply(cmd, reply, VIR_JSON_TYPE_OBJECT) < 0)
+        return -1;
+
+    data = virJSONValueObjectGetObject(reply, "return");
+
+    if (qemuMonitorJSONParseCPUModelData(data, "query-cpu-model-baseline",
+                                         false, &cpu_model, &cpu_props,
+                                         &cpu_name) < 0)
+        return -1;
+
+    return qemuMonitorJSONParseCPUModel(cpu_name, cpu_props, baseline);
+}
+
+
 int qemuMonitorJSONGetCommands(qemuMonitorPtr mon,
                                char ***commands)
 {

src/qemu/qemu_monitor_json.h

@@ -387,6 +387,12 @@ int qemuMonitorJSONGetCPUModelExpansion(qemuMonitorPtr mon,
                                         qemuMonitorCPUModelInfoPtr *model_info)
     ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(6);
 
+int qemuMonitorJSONGetCPUModelBaseline(qemuMonitorPtr mon,
+                                       virCPUDefPtr cpu_a,
+                                       virCPUDefPtr cpu_b,
+                                       qemuMonitorCPUModelInfoPtr *baseline)
+    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4);
+
 int qemuMonitorJSONGetCommands(qemuMonitorPtr mon,
                                char ***commands)
     ATTRIBUTE_NONNULL(2);