[PATCH 6/8] conf: Accept 'default' backend type for <interface type='user'/>

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

After previous commits, domain capabilities XML reports basically
two possible values for backend type: 'default' and 'passt'.
Despite its misleading name, 'default' really means 'use
hypervisor's builtin SLIRP'. Since it's reported in domain
capabilities as a value accepted, make our parser and XML schema
accept it.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/conf/domain_conf.c            | 5 ++++-
 src/conf/schemas/domaincommon.rng | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index cb1154b23f..334152c4ff 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -9320,8 +9320,11 @@ virDomainNetBackendParseXML(xmlNodePtr node,
     g_autofree char *tap = virXMLPropString(node, "tap");
     g_autofree char *vhost = virXMLPropString(node, "vhost");
 
+    /* The VIR_DOMAIN_NET_BACKEND_DEFAULT really means 'use hypervisor's
+     * builtin SLIRP'. It's reported in domain caps and thus we need to accept
+     * it. Hence VIR_XML_PROP_NONE instead of VIR_XML_PROP_NONZERO. */
     if (virXMLPropEnum(node, "type", virDomainNetBackendTypeFromString,
-                       VIR_XML_PROP_NONZERO, &def->backend.type) < 0) {
+                       VIR_XML_PROP_NONE, &def->backend.type) < 0) {
         return -1;
     }
 
diff --git a/src/conf/schemas/domaincommon.rng b/src/conf/schemas/domaincommon.rng
index 844a931deb..33e34255f4 100644
--- a/src/conf/schemas/domaincommon.rng
+++ b/src/conf/schemas/domaincommon.rng
@@ -3826,6 +3826,7 @@
           <optional>
             <attribute name="type">
               <choice>
+                <value>default</value>
                 <value>passt</value>
               </choice>
             </attribute>
-- 
2.44.2