[PATCH 2/4] conf: allow to map sound device to host device

[Roman Bogorodskiy <bogorodskiy@xxxxxxxxx>]

Extend <sound> device element to accept "soundDevice"
sub-element which allows to map guest sound device to host
sound device.

Example

  <sound model='ich6'>
    <soundDevice playback='/dev/dsp0' recording='/dev/dsp0'/>
  </sound>

The "playback" attribute points to the playback device,
and "recording" attribute points to the recording device.

Signed-off-by: Roman Bogorodskiy <bogorodskiy@xxxxxxxxx>
---
 docs/schemas/domaincommon.rng | 15 +++++++++++++++
 src/conf/domain_conf.c        | 24 ++++++++++++++++++++++++
 src/conf/domain_conf.h        |  3 +++
 3 files changed, 42 insertions(+)

diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index a810f569c6..b11b3f2af6 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -4346,6 +4346,18 @@
       </attribute>
     </element>
   </define>
+  <define name="soundDevice">
+    <element name="soundDevice">
+       <attribute name="playback">
+         <text/>
+       </attribute>
+       <optional>
+         <attribute name="recording">
+           <text/>
+         </attribute>
+       </optional>
+    </element>
+  </define>
   <define name="sound">
     <element name="sound">
       <attribute name="model">
@@ -4366,6 +4378,9 @@
         <optional>
           <ref name="address"/>
         </optional>
+	<optional>
+	  <ref name="soundDevice"/>
+	</optional>
         <zeroOrMore>
           <ref name="codec"/>
         </zeroOrMore>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 7ecd2818b9..b678a2319d 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -2850,6 +2850,9 @@ void virDomainSoundDefFree(virDomainSoundDefPtr def)
         virDomainSoundCodecDefFree(def->codecs[i]);
     VIR_FREE(def->codecs);
 
+    VIR_FREE(def->playback);
+    VIR_FREE(def->recording);
+
     VIR_FREE(def);
 }
 
@@ -14984,6 +14987,8 @@ virDomainSoundDefParseXML(virDomainXMLOptionPtr xmlopt,
     virDomainSoundDefPtr def;
     VIR_XPATH_NODE_AUTORESTORE(ctxt);
     g_autofree char *model = NULL;
+    char *recording = NULL;
+    xmlNodePtr soundDeviceNode;
 
     if (VIR_ALLOC(def) < 0)
         return NULL;
@@ -15024,6 +15029,14 @@ virDomainSoundDefParseXML(virDomainXMLOptionPtr xmlopt,
         }
     }
 
+    soundDeviceNode = virXPathNode("./soundDevice", ctxt);
+    if (soundDeviceNode) {
+        def->playback = virXMLPropString(soundDeviceNode, "playback");
+        recording = virXMLPropString(soundDeviceNode, "recording");
+        if (recording)
+            def->recording = recording;
+    }
+
     if (virDomainDeviceInfoParseXML(xmlopt, node, &def->info, flags) < 0)
         goto error;
 
@@ -15056,6 +15069,9 @@ virDomainSoundDefEquals(const virDomainSoundDef *a,
         !virDomainDeviceInfoAddressIsEqual(&a->info, &b->info))
         return false;
 
+    if ((a->playback != b->playback) || (a->recording != b->recording))
+        return false;
+
     return true;
 }
 
@@ -27284,6 +27300,14 @@ virDomainSoundDefFormat(virBufferPtr buf,
     for (i = 0; i < def->ncodecs; i++)
         virDomainSoundCodecDefFormat(&childBuf, def->codecs[i]);
 
+    if (def->playback) {
+        virBufferAsprintf(&childBuf, "<soundDevice playback='%s'", def->playback);
+        if (def->recording)
+            virBufferAsprintf(&childBuf, " recording='%s'/>\n", def->recording);
+        else
+            virBufferAddLit(&childBuf, "/>\n");
+    }
+
     if (virDomainDeviceInfoFormat(&childBuf, &def->info, flags) < 0)
         return -1;
 
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 241149af24..b501f48442 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -1415,6 +1415,9 @@ struct _virDomainSoundDef {
 
     size_t ncodecs;
     virDomainSoundCodecDefPtr *codecs;
+
+    char *playback;
+    char *recording;
 };
 
 typedef enum {
-- 
2.27.0