Add virtio-related options to disks

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

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

docs/formatdomain.html.in

@@ -3011,6 +3011,11 @@
             <code>bus</code> and "pci" or "ccw" <code>address</code> types.
             <span class='since'>Since 1.2.8 (QEMU 2.1)</span>
           </li>
+          <li>
+          For virtio disks,
+          <a href="#elementsVirtio">Virtio-specific options</a> can also be
+          set. (<span class="since">Since 3.5.0</span>)
+          </li>
         </ul>
       </dd>
       <dt><code>backenddomain</code></dt>

docs/schemas/domaincommon.rng

@@ -1770,6 +1770,7 @@
       <optional>
         <ref name="detect_zeroes"/>
       </optional>
+      <ref name="virtioOptions"/>
       <empty/>
     </element>
   </define>

src/conf/domain_conf.c

@@ -1745,6 +1745,7 @@ virDomainDiskDefFree(virDomainDiskDefPtr def)
     VIR_FREE(def->product);
     VIR_FREE(def->domain_name);
     VIR_FREE(def->blkdeviotune.group_name);
+    VIR_FREE(def->virtio);
     virDomainDeviceInfoClear(&def->info);
     virObjectUnref(def->privateData);
 
@@ -4467,6 +4468,10 @@ virDomainDeviceDefPostParseInternal(virDomainDeviceDefPtr dev,
             }
         }
 
+        if (disk->bus != VIR_DOMAIN_DISK_BUS_VIRTIO &&
+            virDomainCheckVirtioOptions(disk->virtio) < 0)
+            return -1;
+
         if (disk->info.type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_NONE &&
             virDomainDiskDefAssignAddress(xmlopt, disk, def) < 0)
             return -1;
@@ -8447,6 +8452,9 @@ virDomainDiskDefParseXML(virDomainXMLOptionPtr xmlopt,
         }
     }
 
+    if (virDomainVirtioOptionsParseXML(ctxt, &def->virtio) < 0)
+        goto error;
+
     /* Disk volume types will have authentication information handled in
      * virStorageTranslateDiskSourcePool
      */
@@ -19172,6 +19180,10 @@ virDomainDiskDefCheckABIStability(virDomainDiskDefPtr src,
         return false;
     }
 
+    if (src->virtio && dst->virtio &&
+        !virDomainVirtioOptionsCheckABIStability(src->virtio, dst->virtio))
+        return false;
+
     if (!virDomainDeviceInfoCheckABIStability(&src->info, &dst->info))
         return false;
 
@@ -21360,6 +21372,9 @@ virDomainDiskDefFormat(virBufferPtr buf,
         virBufferAsprintf(&driverBuf, " iothread='%u'", def->iothread);
     if (def->detect_zeroes)
         virBufferAsprintf(&driverBuf, " detect_zeroes='%s'", detect_zeroes);
+
+    virDomainVirtioOptionsFormat(&driverBuf, def->virtio);
+
     if (virBufferUse(&driverBuf)) {
         virBufferAddLit(buf, "<driver");
         virBufferAddBuffer(buf, &driverBuf);

src/conf/domain_conf.h

@@ -668,6 +668,7 @@ struct _virDomainDiskDef {
     unsigned int iothread; /* unused = 0, > 0 specific thread # */
     int detect_zeroes; /* enum virDomainDiskDetectZeroes */
     char *domain_name; /* backend domain name */
+    virDomainVirtioOptionsPtr virtio;
 };
 
 

tests/qemuxml2argvdata/qemuxml2argv-virtio-options.xml

@@ -15,7 +15,7 @@
   <devices>
     <emulator>/usr/bin/qemu-system-x86_64</emulator>
     <disk type='file' device='disk'>
-      <driver name='qemu' type='raw'/>
+      <driver name='qemu' type='raw' iommu='on' ats='on'/>
       <source file='/var/lib/libvirt/images/img1'/>
       <target dev='vda' bus='virtio'/>
       <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>