[Xen-devel] [PATCH] Obey localtime config option for HVM guests as well as PV guests (changeset 16932)

["Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>]

First my apologies if this doesn't fit the submission
guidelines. I currently don't have access to mecurial so
it was done by hand off-line.

Here is my copy of the updated changeset 16932 from 3.2-testing.

Basically the same as the original 16932 changeset, except
down where it calculates the utc_timeoffset it uses the
builtin 'timezone' and 'altzone' variables from the Python
'time' module, testing whether daylight savings time is
in affect and using 'altzone' if it is or 'timezone' if
it isn't. These are specified as seconds west of UTC, so
I had to negate them to fit.


Ross S. W. Walker


--- a/tools/python/xen/lowlevel/xc/xc.c Tue Jan 29 15:24:04 2008 +0000
+++ b/tools/python/xen/lowlevel/xc/xc.c Tue Jan 29 15:24:34 2008 +0000
@@ -1154,23 +1154,13 @@ static PyObject *pyxc_domain_set_time_of
 static PyObject *pyxc_domain_set_time_offset(XcObject *self, PyObject *args)
 {
     uint32_t dom;
-    int32_t time_offset_seconds;
-    time_t calendar_time;
-    struct tm local_time;
-    struct tm utc_time;
-
-    if (!PyArg_ParseTuple(args, "i", &dom))
-        return NULL;
-
-    calendar_time = time(NULL);
-    localtime_r(&calendar_time, &local_time);
-    gmtime_r(&calendar_time, &utc_time);
-    /* set up to get calendar time based on utc_time, with local dst setting */
-    utc_time.tm_isdst = local_time.tm_isdst;
-    time_offset_seconds = (int32_t)difftime(calendar_time, mktime(&utc_time));
-
-    if (xc_domain_set_time_offset(self->xc_handle, dom, time_offset_seconds) 
!= 0)
-        return NULL;
+    int32_t offset;
+
+    if (!PyArg_ParseTuple(args, "ii", &dom, &offset))
+        return NULL;
+
+    if (xc_domain_set_time_offset(self->xc_handle, dom, offset) != 0)
+        return pyxc_error_to_exception();
 
     Py_INCREF(zero);
     return zero;
@@ -1619,6 +1609,7 @@ static PyMethodDef pyxc_methods[] = {
       METH_VARARGS, "\n"
       "Set a domain's time offset to Dom0's localtime\n"
       " dom        [int]: Domain whose time offset is being set.\n"
+      " offset     [int]: Time offset from UTC in seconds.\n"
       "Returns: [int] 0 on success; -1 on error.\n" },
 
     { "domain_send_trigger",
--- a/tools/python/xen/xend/XendDomainInfo.py   Tue Jan 29 15:24:04 2008 +0000
+++ b/tools/python/xen/xend/XendDomainInfo.py   Tue Jan 29 15:24:34 2008 +0000
@@ -1700,10 +1700,13 @@ 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)
-
-            if self.info['platform'].get('localtime', 0):
-                xc.domain_set_time_offset(self.domid)
 
             xc.domain_setcpuweight(self.domid, \
                                    self.info['vcpus_params']['weight'])
--- a/tools/python/xen/xend/image.py    Tue Jan 29 15:24:04 2008 +0000
+++ b/tools/python/xen/xend/image.py    Tue Jan 29 15:24:34 2008 +0000
@@ -342,6 +342,12 @@ class LinuxImageHandler(ImageHandler):
     flags = 0
     vhpt = 0
 
+    def configure(self, vmConfig):
+        ImageHandler.configure(self, vmConfig)
+        rtc_timeoffset = vmConfig['platform'].get('rtc_timeoffset')
+        if rtc_timeoffset is not None:
+            xc.domain_set_time_offset(self.vm.getDomid(), rtc_timeoffset)
+
     def buildDomain(self):
         store_evtchn = self.vm.getStorePort()
         console_evtchn = self.vm.getConsolePort()

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