libxl: populate build_info vfb in separate function

For HVM domains, vfb info must be populated in the libxl_domain_build_info
struct.  Currently this is done in the libxlMakeVfbList function, but IMO
it would be cleaner to populate the build_info vfb in a separate
libxlMakeBuildInfoVfb function.  libxlMakeVfbList would then handle only
vfb devices, simiar to the other libxlMake<device>List functions.

A future patch will extend libxlMakeBuildInfoVfb to support SPICE.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

src/libxl/libxl_conf.c

@@ -1325,37 +1325,6 @@ libxlMakeVfbList(virPortAllocatorPtr graphicsports,
     d_config->vkbs = x_vkbs;
     d_config->num_vfbs = d_config->num_vkbs = nvfbs;
 
-    /*
-     * VNC or SDL info must also be set in libxl_domain_build_info
-     * for HVM domains.  Use the first vfb device.
-     */
-    if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) {
-        libxl_domain_build_info *b_info = &d_config->b_info;
-        libxl_device_vfb vfb = d_config->vfbs[0];
-
-        if (libxl_defbool_val(vfb.vnc.enable)) {
-            libxl_defbool_set(&b_info->u.hvm.vnc.enable, true);
-            if (VIR_STRDUP(b_info->u.hvm.vnc.listen, vfb.vnc.listen) < 0)
-                goto error;
-            if (VIR_STRDUP(b_info->u.hvm.vnc.passwd, vfb.vnc.passwd) < 0)
-                goto error;
-            b_info->u.hvm.vnc.display = vfb.vnc.display;
-            libxl_defbool_set(&b_info->u.hvm.vnc.findunused,
-                              libxl_defbool_val(vfb.vnc.findunused));
-        } else if (libxl_defbool_val(vfb.sdl.enable)) {
-            libxl_defbool_set(&b_info->u.hvm.sdl.enable, true);
-            libxl_defbool_set(&b_info->u.hvm.sdl.opengl,
-                              libxl_defbool_val(vfb.sdl.opengl));
-            if (VIR_STRDUP(b_info->u.hvm.sdl.display, vfb.sdl.display) < 0)
-                goto error;
-            if (VIR_STRDUP(b_info->u.hvm.sdl.xauthority, vfb.sdl.xauthority) < 0)
-                goto error;
-        }
-
-        if (VIR_STRDUP(b_info->u.hvm.keymap, vfb.keymap) < 0)
-            goto error;
-    }
-
     return 0;
 
  error:
@@ -1368,6 +1337,51 @@ libxlMakeVfbList(virPortAllocatorPtr graphicsports,
     return -1;
 }
 
+/*
+ * Populate vfb info in libxl_domain_build_info struct for HVM domains.
+ * Use first libxl_device_vfb device in libxl_domain_config->vfbs.
+ * Prior to calling this function, libxlMakeVfbList must be called to
+ * populate libxl_domain_config->vfbs.
+ */
+static int
+libxlMakeBuildInfoVfb(virDomainDefPtr def, libxl_domain_config *d_config)
+{
+    libxl_domain_build_info *b_info = &d_config->b_info;
+    libxl_device_vfb x_vfb;
+
+    if (def->os.type != VIR_DOMAIN_OSTYPE_HVM)
+        return 0;
+
+    if (d_config->num_vfbs == 0)
+        return 0;
+
+    x_vfb = d_config->vfbs[0];
+
+    if (libxl_defbool_val(x_vfb.vnc.enable)) {
+        libxl_defbool_set(&b_info->u.hvm.vnc.enable, true);
+        if (VIR_STRDUP(b_info->u.hvm.vnc.listen, x_vfb.vnc.listen) < 0)
+            return -1;
+        if (VIR_STRDUP(b_info->u.hvm.vnc.passwd, x_vfb.vnc.passwd) < 0)
+            return -1;
+        b_info->u.hvm.vnc.display = x_vfb.vnc.display;
+        libxl_defbool_set(&b_info->u.hvm.vnc.findunused,
+                          libxl_defbool_val(x_vfb.vnc.findunused));
+    } else if (libxl_defbool_val(x_vfb.sdl.enable)) {
+        libxl_defbool_set(&b_info->u.hvm.sdl.enable, true);
+        libxl_defbool_set(&b_info->u.hvm.sdl.opengl,
+                          libxl_defbool_val(x_vfb.sdl.opengl));
+        if (VIR_STRDUP(b_info->u.hvm.sdl.display, x_vfb.sdl.display) < 0)
+            return -1;
+        if (VIR_STRDUP(b_info->u.hvm.sdl.xauthority, x_vfb.sdl.xauthority) < 0)
+            return -1;
+    }
+
+    if (VIR_STRDUP(b_info->u.hvm.keymap, x_vfb.keymap) < 0)
+        return -1;
+
+    return 0;
+}
+
 /*
  * Get domain0 autoballoon configuration.  Honor user-specified
  * setting in libxl.conf first.  If not specified, autoballooning
@@ -1766,6 +1780,9 @@ libxlBuildDomainConfig(virPortAllocatorPtr graphicsports,
     if (libxlMakeVfbList(graphicsports, def, d_config) < 0)
         return -1;
 
+    if (libxlMakeBuildInfoVfb(def, d_config) < 0)
+        return -1;
+
     if (libxlMakePCIList(def, d_config) < 0)
         return -1;