[PATCH 7/9] libxl: Stubdom emulator type

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Xen have feature of having device model in separate domain (called stub
domain). Add <stubdomain> element to allow selecting such configuration.
Emulator path is still used for qemu running in dom0 (if any). Libxl currently
do not allow to select stubdomain path.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
---
 docs/formatdomain.html.in     | 13 +++++++++++++
 docs/schemas/domaincommon.rng | 10 ++++++++++
 src/conf/domain_conf.c        | 14 ++++++++++++++
 src/conf/domain_conf.h        |  3 ++-
 src/libxl/libxl_conf.c        |  8 ++++++++
 5 files changed, 47 insertions(+), 1 deletion(-)

Changes in v4:
 - change <emulator type='stubdom'> to separate <stubdomain> element

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index fb0a0d1..054f48f 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1670,6 +1670,19 @@
       </dd>
     </dl>
 
+    <dl>
+      <dt><code>stubdomain</code></dt>
+      <dd>
+        <span class="since">Since 1.2.13</span>, the optional <code>stubdomain</code>
+          element contains <code>enabled</code> yes/no/default attribute. If enabled
+          Emulator will be launched in stub domain (Xen only). Currently there
+          is no way to provide path to that emulator. Note that in most cases
+          this emulator will be in addition to one in dom0.
+          <code>emulator</code> element described above still controls the path
+          to the dom0 instance.
+      </dd>
+    </dl>
+
     <h4><a name="elementsDisks">Hard drives, floppy disks, CDROMs</a></h4>
 
     <p>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 4e4fe9f..539db39 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -2567,6 +2567,13 @@
       <ref name="absFilePath"/>
     </element>
   </define>
+  <define name="stubdomain">
+    <element name="stubdomain">
+      <attribute name="enabled">
+        <ref name="virYesNo"/>
+      </attribute>
+    </element>
+  </define>
   <!--
       A graphic description, currently in Xen only 2 types are supported:
         - sdl with optional display, xauth and fullscreen
@@ -4007,6 +4014,9 @@
         <optional>
           <ref name="emulator"/>
         </optional>
+        <optional>
+          <ref name="stubdomain"/>
+        </optional>
         <zeroOrMore>
           <choice>
             <ref name="disk"/>
diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index c430e03..e327e55 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -14107,6 +14107,9 @@ virDomainDefParseXML(xmlDocPtr xml,
     }
 
     def->emulator = virXPathString("string(./devices/emulator[1])", ctxt);
+    tmp = virXPathString("string(./devices/stubdomain/@enabled)", ctxt);
+    if (tmp)
+        def->stubdomain = virTristateBoolTypeFromString(tmp);
 
     /* analysis of the disk devices */
     if ((n = virXPathNodeSet("./devices/disk", ctxt, &nodes)) < 0)
@@ -16064,6 +16067,14 @@ virDomainDefCheckABIStability(virDomainDefPtr src,
         goto error;
     }
 
+    if (src->stubdomain != dst->stubdomain) {
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                _("Target domain stubdomain '%s' does not match source '%s'"),
+                virTristateBoolTypeToString(dst->stubdomain),
+                virTristateBoolTypeToString(src->stubdomain));
+        goto error;
+    }
+
     if (!virDomainDefFeaturesCheckABIStability(src, dst))
         goto error;
 
@@ -20303,6 +20314,9 @@ virDomainDefFormatInternal(virDomainDefPtr def,
 
     virBufferEscapeString(buf, "<emulator>%s</emulator>\n",
                           def->emulator);
+    if (def->stubdomain)
+        virBufferAsprintf(buf, "<stubdomain enabled='%s'/>\n",
+                          virTristateBoolTypeToString(def->stubdomain));
 
     for (n = 0; n < def->ndisks; n++)
         if (virDomainDiskDefFormat(buf, def->disks[n], flags) < 0)
diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h
index 36c8131..446f4f0 100644
--- a/src/conf/domain_conf.h
+++ b/src/conf/domain_conf.h
@@ -2108,9 +2108,10 @@ struct _virDomainDef {
 
     virDomainOSDef os;
     char *emulator;
-    /* These three options are of type virTristateSwitch,
+    /* These four options are of type virTristateSwitch,
      * except VIR_DOMAIN_FEATURE_CAPABILITIES that is of type
      * virDomainCapabilitiesPolicy */
+    int stubdomain;
     int features[VIR_DOMAIN_FEATURE_LAST];
     int apic_eoi;
     int hyperv_features[VIR_DOMAIN_HYPERV_LAST];
diff --git a/src/libxl/libxl_conf.c b/src/libxl/libxl_conf.c
index 50ef9d8..8ec3c75 100644
--- a/src/libxl/libxl_conf.c
+++ b/src/libxl/libxl_conf.c
@@ -727,6 +727,14 @@ libxlMakeDomBuildInfo(virDomainDefPtr def,
             b_info->device_model_version = libxlDomainGetEmulatorType(def);
         }
 
+        /* In case of stubdom there will be two qemu instances:
+         *  - in stubdom (libxl uses hardcoded path for this one),
+         *  - in dom0 as a backend for stubdom (if needed).
+         */
+        if (def->stubdomain)
+            libxl_defbool_set(&b_info->device_model_stubdomain,
+                              def->stubdomain == VIR_TRISTATE_BOOL_YES);
+
         if (def->nserials) {
             if (def->nserials > 1) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-- 
2.1.0

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