Add virtio-related options to video

https://bugzilla.redhat.com/show_bug.cgi?id=1283251

Reviewed-by: Pavel Hrdina <phrdina@redhat.com>

docs/formatdomain.html.in

@@ -6136,6 +6136,18 @@ qemu-kvm -net nic,model=? /dev/null
         The optional <code>address</code> sub-element can be used to
         tie the video device to a particular PCI slot.
       </dd>
+
+      <dt><code>driver</code></dt>
+      <dd>
+        The subelement <code>driver</code> can be used to tune the device:
+        <dl>
+          <dt>virtio options</dt>
+          <dd>
+          <a href="#elementsVirtio">Virtio-specific options</a> can also be
+          set. (<span class="since">Since 3.5.0</span>)
+          </dd>
+        </dl>
+      </dd>
     </dl>
 
     <h4><a name="elementsConsole">Consoles, serial, parallel &amp; channel devices</a></h4>

docs/schemas/domaincommon.rng

@@ -3218,6 +3218,11 @@
    -->
   <define name="video">
     <element name="video">
+      <optional>
+        <element name="driver">
+          <ref name="virtioOptions"/>
+        </element>
+      </optional>
       <optional>
         <element name="model">
           <choice>

src/conf/domain_conf.c

@@ -2352,6 +2352,7 @@ void virDomainVideoDefFree(virDomainVideoDefPtr def)
     virDomainDeviceInfoClear(&def->info);
 
     VIR_FREE(def->accel);
+    VIR_FREE(def->virtio);
     VIR_FREE(def);
 }
 
@@ -13525,11 +13526,13 @@ virDomainVideoAccelDefParseXML(xmlNodePtr node)
 
 static virDomainVideoDefPtr
 virDomainVideoDefParseXML(xmlNodePtr node,
+                          xmlXPathContextPtr ctxt,
                           const virDomainDef *dom,
                           unsigned int flags)
 {
     virDomainVideoDefPtr def;
     xmlNodePtr cur;
+    xmlNodePtr saved = ctxt->node;
     char *type = NULL;
     char *heads = NULL;
     char *vram = NULL;
@@ -13538,6 +13541,8 @@ virDomainVideoDefParseXML(xmlNodePtr node,
     char *vgamem = NULL;
     char *primary = NULL;
 
+    ctxt->node = node;
+
     if (VIR_ALLOC(def) < 0)
         return NULL;
 
@@ -13639,7 +13644,12 @@ virDomainVideoDefParseXML(xmlNodePtr node,
     if (virDomainDeviceInfoParseXML(node, NULL, &def->info, flags) < 0)
         goto error;
 
+    if (virDomainVirtioOptionsParseXML(ctxt, &def->virtio) < 0)
+        goto error;
+
  cleanup:
+    ctxt->node = saved;
+
     VIR_FREE(type);
     VIR_FREE(ram);
     VIR_FREE(vram);
@@ -14438,7 +14448,7 @@ virDomainDeviceDefParse(const char *xmlStr,
             goto error;
         break;
     case VIR_DOMAIN_DEVICE_VIDEO:
-        if (!(dev->data.video = virDomainVideoDefParseXML(node, def, flags)))
+        if (!(dev->data.video = virDomainVideoDefParseXML(node, ctxt, def, flags)))
             goto error;
         break;
     case VIR_DOMAIN_DEVICE_HOSTDEV:
@@ -18373,7 +18383,7 @@ virDomainDefParseXML(xmlDocPtr xml,
         virDomainVideoDefPtr video;
         ssize_t insertAt = -1;
 
-        if (!(video = virDomainVideoDefParseXML(nodes[i], def, flags)))
+        if (!(video = virDomainVideoDefParseXML(nodes[i], ctxt, def, flags)))
             goto error;
 
         if (video->primary) {
@@ -19440,6 +19450,10 @@ virDomainVideoDefCheckABIStability(virDomainVideoDefPtr src,
         }
     }
 
+    if (src->virtio && dst->virtio &&
+        !virDomainVirtioOptionsCheckABIStability(src->virtio, dst->virtio))
+        return false;
+
     if (!virDomainDeviceInfoCheckABIStability(&src->info, &dst->info))
         return false;
 
@@ -23376,6 +23390,7 @@ virDomainVideoDefFormat(virBufferPtr buf,
                         unsigned int flags)
 {
     const char *model = virDomainVideoTypeToString(def->type);
+    virBuffer driverBuf = VIR_BUFFER_INITIALIZER;
 
     if (!model) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -23385,6 +23400,14 @@ virDomainVideoDefFormat(virBufferPtr buf,
 
     virBufferAddLit(buf, "<video>\n");
     virBufferAdjustIndent(buf, 2);
+    virDomainVirtioOptionsFormat(&driverBuf, def->virtio);
+    if (virBufferCheckError(&driverBuf) < 0)
+        return -1;
+    if (virBufferUse(&driverBuf)) {
+        virBufferAddLit(buf, "<driver");
+        virBufferAddBuffer(buf, &driverBuf);
+        virBufferAddLit(buf, "/>\n");
+    }
     virBufferAsprintf(buf, "<model type='%s'",
                       model);
     if (def->ram)

src/conf/domain_conf.h

@@ -1376,6 +1376,7 @@ struct _virDomainVideoDef {
     bool primary;
     virDomainVideoAccelDefPtr accel;
     virDomainDeviceInfo info;
+    virDomainVirtioOptionsPtr virtio;
 };
 
 /* graphics console modes */

tests/qemuxml2argvdata/qemuxml2argv-virtio-options.xml

@@ -69,6 +69,7 @@
     <input type='mouse' bus='ps2'/>
     <input type='keyboard' bus='ps2'/>
     <video>
+      <driver iommu='on' ats='on'/>
       <model type='virtio' heads='1' primary='yes'>
         <acceleration accel3d='yes'/>
       </model>