[libvirt] [PATCH 07/12] conf: support backend domain name in disk and network devices

[Marek Marczykowski]

At least Xen supports backend drivers in another domain (aka "driver
domain"). This patch introduces XML config option for such setting as
'domain' element with 'name' attribute. Verification its content is left
for the driver.

In the future some option will be needed for USB devices (hostdev
objects), but for now libxl doesn't have support for PVUSB.
---
 docs/schemas/domaincommon.rng | 14 ++++++++++++++
 src/conf/domain_conf.c        | 27 +++++++++++++++++++++++++++
 src/conf/domain_conf.h        |  2 ++
 3 files changed, 43 insertions(+)

diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 8d7e6db..1423187 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -869,6 +869,13 @@
       </optional>
       <ref name="target"/>
       <optional>
+        <element name="domain">
+          <attribute name="name">
+            <ref name="domainName"/>
+          </attribute>
+        </element>
+      </optional>
+      <optional>
         <ref name="deviceBoot"/>
       </optional>
       <optional>
@@ -1834,6 +1841,13 @@
         </element>
       </optional>
       <optional>
+        <element name="domain">
+          <attribute name="name">
+            <ref name="domainName"/>
+          </attribute>
+        </element>
+      </optional>
+      <optional>
         <element name="model">
           <attribute name="type">
             <data type="string">
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 257a265..bf1fec6 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -1103,6 +1103,7 @@ void virDomainDiskDefFree(virDomainDiskDefPtr def)
     VIR_FREE(def->vendor);
     VIR_FREE(def->product);
     VIR_FREE(def->script);
+    VIR_FREE(def->domain_name);
     if (def->auth.secretType == VIR_DOMAIN_DISK_SECRET_TYPE_USAGE)
         VIR_FREE(def->auth.secret.usage);
     virStorageEncryptionFree(def->encryption);
@@ -1228,6 +1229,7 @@ void virDomainNetDefFree(virDomainNetDefPtr def)
 
     VIR_FREE(def->virtPortProfile);
     VIR_FREE(def->script);
+    VIR_FREE(def->domain_name);
     VIR_FREE(def->ifname);
 
     virDomainDeviceInfoClear(&def->info);
@@ -3995,6 +3997,7 @@ virDomainDiskDefParseXML(virCapsPtr caps,
     char *vendor = NULL;
     char *product = NULL;
     char *script = NULL;
+    char *domain_name = NULL;
     int expected_secret_usage = -1;
     int auth_secret_usage = -1;
 
@@ -4153,6 +4156,9 @@ virDomainDiskDefParseXML(virCapsPtr caps,
             } else if (!script &&
                        xmlStrEqual(cur->name, BAD_CAST "script")) {
                 script = virXMLPropString(cur, "path");
+            } else if (!domain_name &&
+                       xmlStrEqual(cur->name, BAD_CAST "domain")) {
+                domain_name = virXMLPropString(cur, "name");
             } else if (xmlStrEqual(cur->name, BAD_CAST "geometry")) {
                 if (virXPathUInt("string(./geometry/@cyls)",
                                  ctxt, &def->geometry.cylinders) < 0) {
@@ -4447,6 +4453,11 @@ virDomainDiskDefParseXML(virCapsPtr caps,
         ctxt->node = saved_node;
     }
 
+    if (domain_name != NULL) {
+        def->domain_name = domain_name;
+        domain_name = NULL;
+    }
+
     if (target == NULL) {
         virReportError(VIR_ERR_NO_TARGET,
                        source ? "%s" : NULL, source);
@@ -4796,6 +4807,7 @@ cleanup:
     VIR_FREE(vendor);
     VIR_FREE(product);
     VIR_FREE(script);
+    VIR_FREE(domain_name);
 
     ctxt->node = save_ctxt;
     return def;
@@ -5353,6 +5365,7 @@ virDomainNetDefParseXML(virCapsPtr caps,
     char *mode = NULL;
     char *linkstate = NULL;
     char *addrtype = NULL;
+    char *domain_name = NULL;
     virNWFilterHashTablePtr filterparams = NULL;
     virDomainActualNetDefPtr actual = NULL;
     xmlNodePtr oldnode = ctxt->node;
@@ -5451,6 +5464,9 @@ virDomainNetDefParseXML(virCapsPtr caps,
             } else if (!script &&
                        xmlStrEqual(cur->name, BAD_CAST "script")) {
                 script = virXMLPropString(cur, "path");
+            } else if (!domain_name &&
+                       xmlStrEqual(cur->name, BAD_CAST "domain")) {
+                domain_name = virXMLPropString(cur, "name");
             } else if (xmlStrEqual(cur->name, BAD_CAST "model")) {
                 model = virXMLPropString(cur, "type");
             } else if (xmlStrEqual(cur->name, BAD_CAST "driver")) {
@@ -5682,6 +5698,10 @@ virDomainNetDefParseXML(virCapsPtr caps,
         def->script = script;
         script = NULL;
     }
+    if (domain_name != NULL) {
+        def->domain_name = domain_name;
+        domain_name = NULL;
+    }
     if (ifname != NULL) {
         def->ifname = ifname;
         ifname = NULL;
@@ -5808,6 +5828,7 @@ cleanup:
     VIR_FREE(mode);
     VIR_FREE(linkstate);
     VIR_FREE(addrtype);
+    VIR_FREE(domain_name);
     virNWFilterHashTableFree(filterparams);
 
     return def;
@@ -12909,6 +12930,10 @@ virDomainDiskDefFormat(virBufferPtr buf,
 
     virBufferEscapeString(buf, "      <script path='%s'/>\n", def->script);
 
+    if (def->domain_name) {
+        virBufferEscapeString(buf, "      <domain name='%s'/>\n", def->domain_name);
+    }
+
     virDomainDiskGeometryDefFormat(buf, def);
     virDomainDiskBlockIoDefFormat(buf, def);
 
@@ -13456,6 +13481,8 @@ virDomainNetDefFormat(virBufferPtr buf,
         return -1;
     virBufferEscapeString(buf, "<script path='%s'/>\n",
                           def->script);
+    if (def->domain_name)
+        virBufferEscapeString(buf, "<domain name='%s'/>\n", def->domain_name);
     if (def->ifname &&
         !((flags & VIR_DOMAIN_XML_INACTIVE) &&
           (STRPREFIX(def->ifname, VIR_NET_GENERATED_PREFIX)))) {
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index d55d209..db3002b 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -669,6 +669,7 @@ struct _virDomainDiskDef {
     int rawio; /* no = 0, yes = 1 */
     int sgio; /* enum virDomainDiskSGIO */
     char *script;
+    char *domain_name; /* backend domain name */
 
     size_t nseclabels;
     virSecurityDeviceLabelDefPtr *seclabels;
@@ -919,6 +920,7 @@ struct _virDomainNetDef {
         unsigned long sndbuf;
     } tune;
     char *script;
+    char *domain_name; /* backend domain name */
     char *ifname;
     virDomainDeviceInfo info;
     char *filter;
-- 
1.8.1.4