[libvirt] [PATCHv5 11/13] Add compatibility attribute to video

Han Han hhan at redhat.com
Mon Aug 29 07:25:49 UTC 2016


Hi Ján,
I apply your patches of virtio compatibility attribute. And I find virtio video and input devices using virtio modern when set compatibility as legacy.
The xml:
   <video>
      <driver compatibility='legacy'/>
      <model type='virtio' heads='1' primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
  <input type='mouse' bus='virtio'>
      <driver compatibility='legacy'/>
      <alias name='input1'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
    </input>
    <input type='keyboard' bus='virtio'>
      <driver compatibility='legacy'/>
      <alias name='input2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x0a' function='0x0'/>
    </input>

Check virtio version in guest:
# for i in `find /sys/devices -name 'virtio[0-9]*'`;do
>      echo -e $(lspci -s $(echo $i|egrep -o  '[0-9a-fA-F]{4}:[0-9a-fA-F]{2}:[01][0-9a-fA-F]\.[0-7]'))'\t'$(cat  $i/features|cut -c 33)
>  done
00:02.0 VGA compatible controller: Red Hat, Inc Virtio GPU (rev 01)        1
00:03.0 Ethernet controller: Red Hat, Inc Virtio network device        1
00:05.0 Communication controller: Red Hat, Inc Virtio console        1
00:07.0 SCSI storage controller: Red Hat, Inc Virtio block device        1
00:08.0 Unclassified device [00ff]: Red Hat, Inc Virtio memory balloon        1
00:09.0 Mouse controller: Red Hat, Inc Virtio input (rev 01)        1
00:0a.0 Keyboard controller: Red Hat, Inc Virtio input (rev 01)        1

For the issue I got Gerd's reply on virt-devel:

<snippet>
> Right now the default is "disable-legacy=off,disable-modern=on" (with
> the exception of virtio-input and virtio-gpu, those two are newer than
> virtio 1.0 and thus don't support legacy virtio).
</snippet>

So, maybe we should make compatibility='legacy' invalid in virtio video and input devices in case of confusion.


----- Original Message -----
From: "Ján Tomko" <jtomko at redhat.com>
To: libvir-list at redhat.com
Sent: Tuesday, August 23, 2016 6:20:53 PM
Subject: [libvirt] [PATCHv5 11/13] Add compatibility attribute to video

<video>
  <driver compatibility='modern'/>
  <model type='virtio' heads='1' primary='yes'/>
</video>

https://bugzilla.redhat.com/show_bug.cgi?id=1227354
---
 docs/formatdomain.html.in                               |  8 ++++++++
 docs/schemas/domaincommon.rng                           |  5 +++++
 src/conf/domain_conf.c                                  | 17 +++++++++++++++--
 src/conf/domain_conf.h                                  |  1 +
 tests/qemuxml2argvdata/qemuxml2argv-virtio-revision.xml |  1 +
 .../qemuxml2xmlout-virtio-revision.xml                  |  1 +
 6 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 41a9325..d640e8d 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -5641,6 +5641,14 @@ 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 <code>compatibility</code> attribute can be used to specify the
+        compatibility of virtio devices. Allowed values are <code>legacy</code>,
+        <code>transitional</code> and <code>modern</code>.
+        <span class="since">Since 2.2.0</span>.
+      </dd>
     </dl>
 
     <h4><a name="elementsConsole">Consoles, serial, parallel & channel devices</a></h4>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index ed00ace..f250cbc 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -3080,6 +3080,11 @@
   <define name="video">
     <element name="video">
       <optional>
+        <element name="driver">
+          <ref name="compatibility"/>
+        </element>
+      </optional>
+      <optional>
         <element name="model">
           <choice>
             <attribute name="type">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 166f5fb..03c856c 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -12605,11 +12605,13 @@ 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;
@@ -12618,6 +12620,8 @@ virDomainVideoDefParseXML(xmlNodePtr node,
     char *vgamem = NULL;
     char *primary = NULL;
 
+    ctxt->node = node;
+
     if (VIR_ALLOC(def) < 0)
         return NULL;
 
@@ -12719,7 +12723,12 @@ virDomainVideoDefParseXML(xmlNodePtr node,
     if (virDomainDeviceInfoParseXML(node, NULL, &def->info, flags) < 0)
         goto error;
 
+    if (virDomainDriverCompatibilityParseXML(ctxt, &def->compatibility) < 0)
+        goto error;
+
  cleanup:
+    ctxt->node = saved;
+
     VIR_FREE(type);
     VIR_FREE(ram);
     VIR_FREE(vram);
@@ -13414,7 +13423,7 @@ 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:
@@ -17084,7 +17093,7 @@ 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) {
@@ -21896,6 +21905,10 @@ virDomainVideoDefFormat(virBufferPtr buf,
 
     virBufferAddLit(buf, "<video>\n");
     virBufferAdjustIndent(buf, 2);
+    if (def->compatibility) {
+        virBufferAsprintf(buf, "<driver compatibility='%s'/>\n",
+                          virDomainDriverCompatibilityTypeToString(def->compatibility));
+    }
     virBufferAsprintf(buf, "<model type='%s'",
                       model);
     if (def->ram)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 342218e..ecccc0a 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1322,6 +1322,7 @@ struct _virDomainVideoDef {
     bool primary;
     virDomainVideoAccelDefPtr accel;
     virDomainDeviceInfo info;
+    virDomainDriverCompatibility compatibility;
 };
 
 /* graphics console modes */
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-virtio-revision.xml b/tests/qemuxml2argvdata/qemuxml2argv-virtio-revision.xml
index 5b9726a..fecf9e5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-virtio-revision.xml
+++ b/tests/qemuxml2argvdata/qemuxml2argv-virtio-revision.xml
@@ -86,6 +86,7 @@
     <input type='mouse' bus='ps2'/>
     <input type='keyboard' bus='ps2'/>
     <video>
+      <driver compatibility='modern'/>
       <model type='virtio' heads='1' primary='yes'>
         <acceleration accel3d='yes'/>
       </model>
diff --git a/tests/qemuxml2xmloutdata/qemuxml2xmlout-virtio-revision.xml b/tests/qemuxml2xmloutdata/qemuxml2xmlout-virtio-revision.xml
index ab69bb7..f1c728e 100644
--- a/tests/qemuxml2xmloutdata/qemuxml2xmlout-virtio-revision.xml
+++ b/tests/qemuxml2xmloutdata/qemuxml2xmlout-virtio-revision.xml
@@ -86,6 +86,7 @@
     <input type='mouse' bus='ps2'/>
     <input type='keyboard' bus='ps2'/>
     <video>
+      <driver compatibility='modern'/>
       <model type='virtio' heads='1' primary='yes'>
         <acceleration accel3d='yes'/>
       </model>
-- 
2.7.3

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