xend: fix rtc_timeoffset when localtime=1

The rtc_timeoffset parameter in VM config is ignored when
localtime=1. Also it is not preserved across reboot.

NOTE:
This patch changes the meaning of the xenstore
/vm/<uuid>/rtc/timeoffset
from utc offset to local offset. (it's OK for the ioemu)

Signed-off-by: Kouya Shimura <kouya@jp.fujitsu.com>

tools/python/xen/xend/XendDomainInfo.py

@@ -1605,9 +1605,6 @@ class XendDomainInfo:
         # convert two lists into a python dictionary
         vm_details = dict(zip(cfg_vm, vm_details))
 
-        if vm_details['rtc/timeoffset'] == None:
-            vm_details['rtc/timeoffset'] = "0"
-
         for arg, val in vm_details.items():
             if arg in XendConfig.LEGACY_CFG_TO_XENAPI_CFG:
                 xapiarg = XendConfig.LEGACY_CFG_TO_XENAPI_CFG[arg]
@@ -1629,10 +1626,10 @@ class XendDomainInfo:
             self.info.update_with_image_sxp(sxp.from_string(image_sxp))
             changed = True
 
-        # Check if the rtc offset has changes
-        if vm_details.get("rtc/timeoffset", "0") != self.info["platform"].get("rtc_timeoffset", "0"):
-            self.info["platform"]["rtc_timeoffset"] = vm_details.get("rtc/timeoffset", 0)
-            changed = True
+        # Update the rtc_timeoffset to be preserved across reboot.
+        # NB. No need to update xenstore domain section.
+        val = int(vm_details.get("rtc/timeoffset", 0))
+        self.info["platform"]["rtc_timeoffset"] = val
  
         if changed:
             # Update the domain section of the store, as this contains some
@@ -2440,12 +2437,6 @@ class XendDomainInfo:
         self._configureBootloader()
 
         try:
-            if self.info['platform'].get('localtime', 0):
-                if time.localtime(time.time())[8]:
-                    self.info['platform']['rtc_timeoffset'] = -time.altzone
-                else:
-                    self.info['platform']['rtc_timeoffset'] = -time.timezone
-
             self.image = image.create(self, self.info)
 
             # repin domain vcpus if a restricted cpus list is provided

tools/python/xen/xend/image.py

@@ -119,9 +119,14 @@ class ImageHandler:
         self.vncconsole = int(vmConfig['platform'].get('vncconsole', 0))
         self.dmargs = self.parseDeviceModelArgs(vmConfig)
         self.pid = None
-        rtc_timeoffset = vmConfig['platform'].get('rtc_timeoffset')
-        if rtc_timeoffset is not None:
-            xc.domain_set_time_offset(self.vm.getDomid(), int(rtc_timeoffset))
+        rtc_timeoffset = int(vmConfig['platform'].get('rtc_timeoffset', 0))
+        if vmConfig['platform'].get('localtime', 0):
+            if time.localtime(time.time())[8]:
+                rtc_timeoffset -= time.altzone
+            else:
+                rtc_timeoffset -= time.timezone
+        if rtc_timeoffset != 0:
+            xc.domain_set_time_offset(self.vm.getDomid(), rtc_timeoffset)
 
         self.cpuid = None
         self.cpuid_check = None

tools/python/xen/xm/create.py

@@ -204,7 +204,7 @@ gopts.var('cpus', val='CPUS',
           use="CPUS to run the domain on.")
 
 gopts.var('rtc_timeoffset', val='RTC_TIMEOFFSET',
-          fn=set_value, default="0",
+          fn=set_int, default=0,
           use="Set RTC offset.")
 
 gopts.var('pae', val='PAE',