qemuMonitorCPUModelInfo: Add support for non-migratable features

QEMU is able to tell us whether a CPU feature would block migration or
not. This patch adds support for storing such features in
qemuMonitorCPUModelInfo.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>

src/qemu/qemu_capabilities.c

@@ -3272,6 +3272,7 @@ virQEMUCapsLoadHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
     int ret = -1;
     size_t i;
     int n;
+    int val;
 
     if (virtType == VIR_DOMAIN_VIRT_KVM)
         hostCPUNode = virXPathNode("./hostCPU[@type='kvm']", ctxt);
@@ -3293,6 +3294,15 @@ virQEMUCapsLoadHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
         goto cleanup;
     }
 
+    if (!(str = virXMLPropString(hostCPUNode, "migratability")) ||
+        (val = virTristateBoolTypeFromString(str)) <= 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("invalid migratability value for host CPU model"));
+        goto cleanup;
+    }
+    hostCPU->migratability = val == VIR_TRISTATE_BOOL_YES;
+    VIR_FREE(str);
+
     ctxt->node = hostCPUNode;
 
     if ((n = virXPathNodeSet("./property", ctxt, &nodes)) > 0) {
@@ -3303,7 +3313,6 @@ virQEMUCapsLoadHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
 
         for (i = 0; i < n; i++) {
             qemuMonitorCPUPropertyPtr prop = hostCPU->props + i;
-            int type;
 
             ctxt->node = nodes[i];
 
@@ -3315,7 +3324,7 @@ virQEMUCapsLoadHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
             }
 
             if (!(str = virXMLPropString(ctxt->node, "type")) ||
-                (type = qemuMonitorCPUPropertyTypeFromString(str)) < 0) {
+                (val = qemuMonitorCPUPropertyTypeFromString(str)) < 0) {
                 virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
                                _("missing or invalid CPU model property type "
                                  "in QEMU capabilities cache"));
@@ -3323,7 +3332,7 @@ virQEMUCapsLoadHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
             }
             VIR_FREE(str);
 
-            prop->type = type;
+            prop->type = val;
             switch (prop->type) {
             case QEMU_MONITOR_CPU_PROPERTY_BOOLEAN:
                 if (virXPathBoolean("./@value='true'", ctxt))
@@ -3355,6 +3364,19 @@ virQEMUCapsLoadHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
             case QEMU_MONITOR_CPU_PROPERTY_LAST:
                 break;
             }
+
+            if ((str = virXMLPropString(ctxt->node, "migratable"))) {
+                if ((val = virTristateBoolTypeFromString(str)) <= 0) {
+                    virReportError(VIR_ERR_INTERNAL_ERROR,
+                                   _("unknown migratable value for '%s' host "
+                                     "CPU model property"),
+                                   prop->name);
+                    goto cleanup;
+                }
+
+                prop->migratable = val;
+                VIR_FREE(str);
+            }
         }
     }
 
@@ -3707,8 +3729,10 @@ virQEMUCapsFormatHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
     if (!model)
         return;
 
-    virBufferAsprintf(buf, "<hostCPU type='%s' model='%s'>\n",
+    virBufferAsprintf(buf,
-                      typeStr, model->name);
+                      "<hostCPU type='%s' model='%s' migratability='%s'>\n",
+                      typeStr, model->name,
+                      model->migratability ? "yes" : "no");
     virBufferAdjustIndent(buf, 2);
 
     for (i = 0; i < model->nprops; i++) {
@@ -3735,6 +3759,11 @@ virQEMUCapsFormatHostCPUModelInfo(virQEMUCapsPtr qemuCaps,
         case QEMU_MONITOR_CPU_PROPERTY_LAST:
             break;
         }
+
+        if (prop->migratable > 0)
+            virBufferAsprintf(buf, " migratable='%s'",
+                              virTristateBoolTypeToString(prop->migratable));
+
         virBufferAddLit(buf, "/>\n");
     }
 

src/qemu/qemu_monitor.c

@@ -3747,12 +3747,14 @@ qemuMonitorCPUModelInfoCopy(const qemuMonitorCPUModelInfo *orig)
     if (VIR_STRDUP(copy->name, orig->name) < 0)
         goto error;
 
+    copy->migratability = orig->migratability;
     copy->nprops = orig->nprops;
 
     for (i = 0; i < orig->nprops; i++) {
         if (VIR_STRDUP(copy->props[i].name, orig->props[i].name) < 0)
             goto error;
 
+        copy->props[i].migratable = orig->props[i].migratable;
         copy->props[i].type = orig->props[i].type;
         switch (orig->props[i].type) {
         case QEMU_MONITOR_CPU_PROPERTY_BOOLEAN:

src/qemu/qemu_monitor.h

@@ -992,6 +992,7 @@ struct _qemuMonitorCPUProperty {
         char *string;
         long long number;
     } value;
+    virTristateBool migratable;
 };
 
 typedef struct _qemuMonitorCPUModelInfo qemuMonitorCPUModelInfo;
@@ -1001,6 +1002,7 @@ struct _qemuMonitorCPUModelInfo {
     char *name;
     size_t nprops;
     qemuMonitorCPUPropertyPtr props;
+    bool migratability;
 };
 
 typedef enum {

tests/qemucapabilitiesdata/caps_2.8.0.s390x.xml

@@ -136,7 +136,7 @@
   <kvmVersion>0</kvmVersion>
   <package></package>
   <arch>s390x</arch>
-  <hostCPU type='kvm' model='zEC12.2-base'>
+  <hostCPU type='kvm' model='zEC12.2-base' migratability='no'>
     <property name='aefsi' type='boolean' value='true'/>
     <property name='msa5' type='boolean' value='true'/>
     <property name='msa4' type='boolean' value='true'/>

tests/qemucapabilitiesdata/caps_2.9.0.x86_64.xml

@@ -211,7 +211,7 @@
   <kvmVersion>0</kvmVersion>
   <package> (v2.9.0-rc0-142-g940a8ce)</package>
   <arch>x86_64</arch>
-  <hostCPU type='kvm' model='base'>
+  <hostCPU type='kvm' model='base' migratability='no'>
     <property name='phys-bits' type='number' value='0'/>
     <property name='core-id' type='number' value='-1'/>
     <property name='xlevel' type='number' value='2147483656'/>
@@ -443,7 +443,7 @@
     <property name='avx512pf' type='boolean' value='false'/>
     <property name='xstore-en' type='boolean' value='false'/>
   </hostCPU>
-  <hostCPU type='tcg' model='base'>
+  <hostCPU type='tcg' model='base' migratability='no'>
     <property name='phys-bits' type='number' value='0'/>
     <property name='core-id' type='number' value='-1'/>
     <property name='xlevel' type='number' value='2147483658'/>