conf: Advertise migratable attribute for CPU in domcaps

Signed-off-by: NJiri Denemark <jdenemar@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

docs/formatdomaincaps.html.in

@@ -201,7 +201,12 @@
 <domainCapabilities>
   ...
   <cpu>
-    <mode name='host-passthrough' supported='yes'/>
+    <mode name='host-passthrough' supported='yes'>
+      <enum name='hostPassthroughMigratable'>
+        <value>on</value>
+        <value>off</value>
+      </enum>
+    </mode>
     <mode name='host-model' supported='yes'>
       <model fallback='allow'>Broadwell</model>
       <vendor>Intel</vendor>
@@ -227,7 +232,11 @@
 
     <dl>
       <dt><code>host-passthrough</code></dt>
-      <dd>No mode specific details are provided.</dd>
+      <dd>
+        The <code>hostPassthroughMigratable</code> enum shows possible values
+        of the <code>migratable</code> attribute for the &lt;cpu&gt; element
+        with <code>mode='host-passthrough'</code> in the domain XML.
+      </dd>
 
       <dt><code>host-model</code></dt>
       <dd>

docs/schemas/domaincaps.rng

@@ -99,6 +99,9 @@
         <value>host-passthrough</value>
       </attribute>
       <ref name='supported'/>
+      <optional>
+        <ref name='enum'/>
+      </optional>
     </element>
   </define>
 

src/conf/domain_capabilities.c

@@ -412,10 +412,21 @@ virDomainCapsCPUFormat(virBufferPtr buf,
     virBufferAddLit(buf, "<cpu>\n");
     virBufferAdjustIndent(buf, 2);
 
-    virBufferAsprintf(buf, "<mode name='%s' supported='%s'/>\n",
+    virBufferAsprintf(buf, "<mode name='%s' supported='%s'",
                       virCPUModeTypeToString(VIR_CPU_MODE_HOST_PASSTHROUGH),
                       cpu->hostPassthrough ? "yes" : "no");
 
+    if (cpu->hostPassthrough && cpu->hostPassthroughMigratable.report) {
+        virBufferAddLit(buf, ">\n");
+        virBufferAdjustIndent(buf, 2);
+        ENUM_PROCESS(cpu, hostPassthroughMigratable,
+                     virTristateSwitchTypeToString);
+        virBufferAdjustIndent(buf, -2);
+        virBufferAddLit(buf, "</mode>\n");
+    } else {
+        virBufferAddLit(buf, "/>\n");
+    }
+
     virBufferAsprintf(buf, "<mode name='%s' ",
                       virCPUModeTypeToString(VIR_CPU_MODE_HOST_MODEL));
     if (cpu->hostModel) {

src/conf/domain_capabilities.h

@@ -145,6 +145,7 @@ typedef struct _virDomainCapsCPU virDomainCapsCPU;
 typedef virDomainCapsCPU *virDomainCapsCPUPtr;
 struct _virDomainCapsCPU {
     bool hostPassthrough;
+    virDomainCapsEnum hostPassthroughMigratable;
     virCPUDefPtr hostModel;
     virDomainCapsCPUModelsPtr custom;
 };