Add virtio-related options to input devices

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

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

docs/formatdomain.html.in

@@ -5715,6 +5715,13 @@ qemu-kvm -net nic,model=? /dev/null
       event device passed through to guests. (KVM only)
     </p>
 
+    <p>
+        The subelement <code>driver</code> can be used to tune the virtio
+        options of the device:
+        <a href="#elementsVirtio">Virtio-specific options</a> can also be
+        set. (<span class="since">Since 3.5.0</span>)
+    </p>
+
     <h4><a name="elementsHub">Hub devices</a></h4>
 
     <p>

docs/schemas/domaincommon.rng

@@ -3990,6 +3990,11 @@
 
   <define name="input">
     <element name="input">
+      <optional>
+        <element name="driver">
+          <ref name="virtioOptions"/>
+        </element>
+      </optional>
       <choice>
         <group>
           <attribute name="type">

src/conf/domain_conf.c

@@ -1400,6 +1400,7 @@ void virDomainInputDefFree(virDomainInputDefPtr def)
 
     virDomainDeviceInfoClear(&def->info);
     VIR_FREE(def->source.evdev);
+    VIR_FREE(def->virtio);
     VIR_FREE(def);
 }
 
@@ -11614,6 +11615,9 @@ virDomainInputDefParseXML(const virDomainDef *dom,
         goto error;
     }
 
+    if (virDomainVirtioOptionsParseXML(ctxt, &def->virtio) < 0)
+        goto error;
+
  cleanup:
     VIR_FREE(evdev);
     VIR_FREE(type);
@@ -19354,6 +19358,10 @@ virDomainInputDefCheckABIStability(virDomainInputDefPtr src,
         return false;
     }
 
+    if (src->virtio && dst->virtio &&
+        !virDomainVirtioOptionsCheckABIStability(src->virtio, dst->virtio))
+        return false;
+
     if (!virDomainDeviceInfoCheckABIStability(&src->info, &dst->info))
         return false;
 
@@ -23448,6 +23456,7 @@ virDomainInputDefFormat(virBufferPtr buf,
     const char *type = virDomainInputTypeToString(def->type);
     const char *bus = virDomainInputBusTypeToString(def->bus);
     virBuffer childbuf = VIR_BUFFER_INITIALIZER;
+    virBuffer driverBuf = VIR_BUFFER_INITIALIZER;
 
     /* don't format keyboard into migratable XML for backward compatibility */
     if (flags & VIR_DOMAIN_DEF_FORMAT_MIGRATABLE &&
@@ -23471,6 +23480,15 @@ virDomainInputDefFormat(virBufferPtr buf,
                       type, bus);
 
     virBufferAdjustIndent(&childbuf, virBufferGetIndent(buf, false) + 2);
+    virDomainVirtioOptionsFormat(&driverBuf, def->virtio);
+    if (virBufferCheckError(&driverBuf) < 0)
+        return -1;
+
+    if (virBufferUse(&driverBuf)) {
+        virBufferAddLit(&childbuf, "<driver");
+        virBufferAddBuffer(&childbuf, &driverBuf);
+        virBufferAddLit(&childbuf, "/>\n");
+    }
     virBufferEscapeString(&childbuf, "<source evdev='%s'/>\n", def->source.evdev);
     if (virDomainDeviceInfoFormat(&childbuf, &def->info, flags) < 0)
         return -1;

src/conf/domain_conf.h

@@ -1282,6 +1282,7 @@ struct _virDomainInputDef {
         char *evdev;
     } source;
     virDomainDeviceInfo info;
+    virDomainVirtioOptionsPtr virtio;
 };
 
 typedef enum {

tests/qemuxml2argvdata/qemuxml2argv-virtio-options.xml

@@ -54,15 +54,19 @@
       <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
     </interface>
     <input type='mouse' bus='virtio'>
+      <driver iommu='on' ats='on'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x0e' function='0x0'/>
     </input>
     <input type='keyboard' bus='virtio'>
+      <driver iommu='on' ats='on'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x10' function='0x0'/>
     </input>
     <input type='tablet' bus='virtio'>
+      <driver iommu='on' ats='on'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x11' function='0x0'/>
     </input>
     <input type='passthrough' bus='virtio'>
+      <driver iommu='on' ats='on'/>
       <source evdev='/dev/input/event1234'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x12' function='0x0'/>
     </input>