Add support for reboot-timeout

Whenever the guest machine fails to boot, new parameter (reboot-timeout)
controls whether it should reboot and after how many ms it should do so.

Docs included.

docs/formatdomain.html.in

@@ -105,7 +105,7 @@
     <boot dev='cdrom'/>
     <bootmenu enable='yes'/>
     <smbios mode='sysinfo'/>
-    <bios useserial='yes'/>
+    <bios useserial='yes' rebootTimeout='0'/>
   </os>
   ...</pre>
 
@@ -175,8 +175,13 @@
         Serial Graphics Adapter which allows users to see BIOS messages
         on a serial port. Therefore, one needs to have
         <a href="#elementCharSerial">serial port</a> defined.
-        <span class="since">Since 0.9.4</span>
-      </dd>
+        <span class="since">Since 0.9.4</span>.
+        <span class="since">Since 0.10.2 (QEMU only)</span> there is
+        another attribute, <code>rebootTimeout</code> that controls
+        whether and after how long the guest should start booting
+        again in case the boot fails (according to BIOS). The value is
+        in milliseconds with maximum of <code>65535</code> and special
+        value <code>-1</code> disables the reboot.
     </dl>
 
     <h4><a name="elementsOSBootloader">Host bootloader</a></h4>

docs/schemas/domaincommon.rng

@@ -3190,12 +3190,19 @@
 
   <define name="bios">
     <element name="bios">
-      <attribute name="useserial">
-        <choice>
-          <value>yes</value>
-          <value>no</value>
-        </choice>
-      </attribute>
+      <optional>
+        <attribute name="useserial">
+          <choice>
+            <value>yes</value>
+            <value>no</value>
+          </choice>
+        </attribute>
+      </optional>
+      <optional>
+        <attribute name="rebootTimeout">
+          <ref name="rebootTimeoutDelay"/>
+        </attribute>
+      </optional>
     </element>
   </define>
 
@@ -3469,6 +3476,11 @@
       <param name='minInclusive'>-1</param>
     </data>
   </define>
+  <define name="rebootTimeoutDelay">
+    <data type="short">
+      <param name="minInclusive">-1</param>
+    </data>
+  </define>
   <define name="PortNumber">
     <data type="short">
       <param name="minInclusive">-1</param>

src/conf/domain_conf.c

@@ -8136,7 +8136,7 @@ virDomainDefParseBootXML(xmlXPathContextPtr ctxt,
 {
     xmlNodePtr *nodes = NULL;
     int i, n;
-    char *bootstr;
+    char *bootstr, *tmp;
     char *useserial = NULL;
     int ret = -1;
     unsigned long deviceBoot, serialPorts;
@@ -8214,10 +8214,25 @@ virDomainDefParseBootXML(xmlXPathContextPtr ctxt,
         }
     }
 
+    tmp = virXPathString("string(./os/bios[1]/@rebootTimeout)", ctxt);
+    if (tmp) {
+        /* that was really just for the check if it is there */
+
+        if (virStrToLong_i(tmp, NULL, 0, &def->os.bios.rt_delay) < 0 ||
+            def->os.bios.rt_delay < -1 || def->os.bios.rt_delay > 65535) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("invalid value for rebootTimeout, "
+                             "must be in range [-1,65535]"));
+            goto cleanup;
+        }
+        def->os.bios.rt_set = true;
+    }
+
     *bootCount = deviceBoot;
     ret = 0;
 
 cleanup:
+    VIR_FREE(tmp);
     VIR_FREE(useserial);
     VIR_FREE(nodes);
     return ret;
@@ -13494,11 +13509,17 @@ virDomainDefFormatInternal(virDomainDefPtr def,
             virBufferAsprintf(buf, "    <bootmenu enable='%s'/>\n", enabled);
         }
 
-        if (def->os.bios.useserial) {
-            const char *useserial = (def->os.bios.useserial ==
-                                     VIR_DOMAIN_BIOS_USESERIAL_YES ? "yes"
-                                                                   : "no");
-            virBufferAsprintf(buf, "    <bios useserial='%s'/>\n", useserial);
+        if (def->os.bios.useserial || def->os.bios.rt_set) {
+            virBufferAddLit(buf, "    <bios");
+            if (def->os.bios.useserial)
+                virBufferAsprintf(buf, " useserial='%s'",
+                                  (def->os.bios.useserial ==
+                                   VIR_DOMAIN_BIOS_USESERIAL_YES ? "yes"
+                                                                   : "no"));
+            if (def->os.bios.rt_set)
+                virBufferAsprintf(buf, " rebootTimeout='%d'", def->os.bios.rt_delay);
+
+            virBufferAddLit(buf, "/>\n");
         }
     }
 

src/conf/domain_conf.h

@@ -1420,6 +1420,9 @@ typedef struct _virDomainBIOSDef virDomainBIOSDef;
 typedef virDomainBIOSDef *virDomainBIOSDefPtr;
 struct _virDomainBIOSDef {
     int useserial;
+    /* reboot-timeout parameters */
+    bool rt_set;
+    int rt_delay;
 };
 
 /* Operating system configuration data & machine / arch */