[Xen-devel] [PATCH][VT][6/15] Handle VMX domains correctly across xend restarts

[Arun Sharma <arun.sharma@xxxxxxxxx>]

Handle VMX domains correctly across xend restarts

This patch remembers the device model pid across xend restarts and
avoids creating duplicate device model processes.

Also, device models don't inherit socket fds from xend (which are closed
on exec now), which used to prevent xend restarting.

Signed-off-by: Yunhong Jiang <yunhong.jiang@xxxxxxxxx>
Signed-off-by: Xiaohui Xin <xiaohui.xin@xxxxxxxxx>
Signed-off-by: Arun Sharma <arun.sharma@xxxxxxxxx>

diff -r 5b239652c912 -r 4f2364097bd4 tools/python/xen/web/connection.py
--- a/tools/python/xen/web/connection.py        Tue Aug  9 19:06:44 2005
+++ b/tools/python/xen/web/connection.py        Tue Aug  9 19:06:44 2005
@@ -20,6 +20,7 @@
 import threading
 import select
 import socket
+import fcntl
 
 from errno import EAGAIN, EINTR, EWOULDBLOCK
 
@@ -151,6 +152,9 @@
 
     def createSocket(self):
         raise NotImplementedError()
+
+    def setCloExec(self):
+        fcntl.fcntl(self.sock.fileno(), fcntl.F_SETFD, fcntl.FD_CLOEXEC)
 
     def acceptConnection(self, sock, protocol, addr):
         return SocketServerConnection(sock, protocol, addr, self)
diff -r 5b239652c912 -r 4f2364097bd4 tools/python/xen/web/reactor.py
--- a/tools/python/xen/web/reactor.py   Tue Aug  9 19:06:44 2005
+++ b/tools/python/xen/web/reactor.py   Tue Aug  9 19:06:44 2005
@@ -16,4 +16,4 @@
 #============================================================================
 
 from unix import listenUNIX, connectUNIX
-from tcp import listenTCP, connectTCP
+from tcp import listenTCP, connectTCP, SetCloExec
diff -r 5b239652c912 -r 4f2364097bd4 tools/python/xen/web/tcp.py
--- a/tools/python/xen/web/tcp.py       Tue Aug  9 19:06:44 2005
+++ b/tools/python/xen/web/tcp.py       Tue Aug  9 19:06:44 2005
@@ -85,6 +85,9 @@
     l.startListening()
     return l
 
+def SetCloExec(SocketListener):
+    SocketListener.SetCloExec()
+
 def connectTCP(host, port, factory, timeout=None, bindAddress=None):
     c = TCPConnector(host, port, factory, timeout=timeout, 
bindAddress=bindAddress)
     c.connect()
diff -r 5b239652c912 -r 4f2364097bd4 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py   Tue Aug  9 19:06:44 2005
+++ b/tools/python/xen/xend/XendDomainInfo.py   Tue Aug  9 19:06:44 2005
@@ -231,6 +231,7 @@
         DBVar('restart_time',  ty='float'),
         DBVar('restart_count', ty='int'),
         DBVar('target',        ty='long', path="memory/target"),
+        DBVar('device_model_pid', ty='int'),
         ]
     
     def __init__(self, db):
@@ -275,6 +276,7 @@
         self.vcpus = 1
         self.vcpusdb = {}
         self.bootloader = None
+        self.device_model_pid = 0
 
     def setDB(self, db):
         self.db = db
@@ -457,6 +459,8 @@
             sxpr.append(devs)
         if self.config:
             sxpr.append(['config', self.config])
+        if self.device_model_pid:
+            sxpr.append(['device_model_pid',self.device_model_pid])
         return sxpr
 
     def sxpr_devices(self):
@@ -739,7 +743,8 @@
                 ctrl.initController(reboot=True)
         else:
             self.create_configured_devices()
-        self.image.createDeviceModel()
+        if not self.device_model_pid:
+            self.device_model_pid = self.image.createDeviceModel()
 
     def device_create(self, dev_config):
         """Create a new device.
diff -r 5b239652c912 -r 4f2364097bd4 tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py    Tue Aug  9 19:06:44 2005
+++ b/tools/python/xen/xend/image.py    Tue Aug  9 19:06:44 2005
@@ -262,7 +262,7 @@
     memmap = None
     memmap_value = []
     device_channel = None
-
+    pid = 0
     def createImage(self):
         """Create a VM for the VMX environment.
         """
@@ -369,6 +369,7 @@
         log.info("spawning device models: %s %s", device_model, args)
         self.pid = os.spawnve(os.P_NOWAIT, device_model, args, env)
         log.info("device model pid: %d", self.pid)
+        return self.pid
 
     def vncParams(self):
         # see if a vncviewer was specified
@@ -388,8 +389,11 @@
     def destroy(self):
         channel.eventChannelClose(self.device_channel)
         import signal
+        if not self.pid:
+            self.pid = self.vm.device_model_pid
         os.kill(self.pid, signal.SIGKILL)
         (pid, status) = os.waitpid(self.pid, 0)
+        self.pid = 0
 
     def getDomainMemory(self, mem_mb):
         return (mem_mb * 1024) + self.getPageTableSize(mem_mb)
diff -r 5b239652c912 -r 4f2364097bd4 tools/python/xen/xend/server/relocate.py
--- a/tools/python/xen/xend/server/relocate.py  Tue Aug  9 19:06:44 2005
+++ b/tools/python/xen/xend/server/relocate.py  Tue Aug  9 19:06:44 2005
@@ -140,7 +140,8 @@
     if xroot.get_xend_relocation_server():
         port = xroot.get_xend_relocation_port()
         interface = xroot.get_xend_relocation_address()
-        reactor.listenTCP(port, factory, interface=interface)
+        l = reactor.listenTCP(port, factory, interface=interface)
+        l.setCloExec()
 
 def setupRelocation(dst, port):
     try:

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