stubdoms: qemu monitor support

Add support for the qemu monitor in a stubdom, the same way the
emulated serial support was added few days ago.  The stubdom exports
the monitor as a pty and minios opens a console frontend; qemu in dom0
provides the correspondent backend for this additional pv console that
happens to be the qemu monitor.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

tools/python/xen/xend/XendConfig.py

@@ -1434,17 +1434,21 @@ class XendConfig(dict):
 		    del dev_info['type']
 		    log.debug("iwj dev_type=%s vfb setting dev_info['%s']" %
 				(dev_type, vfb_type))
+                # Create serial backends now, the location value is bogus, but does not matter
+                i=0
+                chardev=0
                 if dev_info.get('serial') is not None :
-                    # Create two serial backends now, the location value is bogus, but does not matter
-                    cfg = self.console_add('vt100', '0')
+                    chardev = chardev + 1
+                if dev_info.get('monitor') is not None :
+                    chardev = chardev + 1
+                if chardev > 0 :
+                    chardev = chardev + 1
+                while i < chardev :
+                    cfg = self.console_add('vt100', str(i))
                     c_uuid = uuid.createString()
                     target['devices'][c_uuid] = ('console', cfg)
                     target['console_refs'].append(c_uuid)
-                    cfg = self.console_add('vt100', '1')
-                    c_uuid = uuid.createString()
-                    target['devices'][c_uuid] = ('console', cfg)
-                    target['console_refs'].append(c_uuid)
-                
+                    i = i + 1
             elif dev_type == 'console':
                 if 'console_refs' not in target:
                     target['console_refs'] = []

tools/python/xen/xend/image.py

@@ -286,6 +286,11 @@ class ImageHandler:
             if dev_type == 'vfb':
                 if 'keymap' in dev_info:
                     keymap = dev_info.get('keymap',{})
+                if 'monitor' in dev_info:
+                    ret.append("-serial")
+                    ret.append(dev_info.get('monitor',{}))
+                    ret.append("-monitor")
+                    ret.append("null")
                 if 'serial' in dev_info:
                     ret.append("-serial")
                     ret.append(dev_info.get('serial',{}))
@@ -717,7 +722,7 @@ class LinuxImageHandler(ImageHandler):
         ret = ImageHandler.parseDeviceModelArgs(self, vmConfig)
         # Equivalent to old xenconsoled behaviour. Should make
         # it configurable in future
-        ret = ret + ["-serial", "pty"]
+        ret = ["-serial", "pty"] + ret
         return ret
 
     def getDeviceModelArgs(self, restore = False):
@@ -749,10 +754,16 @@ class HVMImageHandler(ImageHandler):
 
         if not self.display :
             self.display = ''
-        # Do not store sdl and opengl qemu cli options
-        self.vm.storeVm(("image/dmargs", " ".join([ x for x in self.dmargs
-                        if x != "-sdl"
-                        and x != "-disable-opengl" ])),
+
+        store_dmargs = self.dmargs[:]
+        store_dmargs.remove('-sdl')
+        store_dmargs.remove('-disable-opengl')
+        try :
+            midx = store_dmargs.index('-monitor')
+            store_dmargs[midx + 1] = 'pty'
+        except ValueError :
+            pass
+        self.vm.storeVm(("image/dmargs", " ".join(store_dmargs)),
                         ("image/device-model", self.device_model),
                         ("image/display", self.display))
         self.vm.permissionsVm("image/dmargs", { 'dom': self.vm.getDomid(), 'read': True } )

tools/python/xen/xm/create.py

@@ -354,7 +354,7 @@ gopts.var('irq', val='IRQ',
          For example 'irq=7'.
          This option may be repeated to add more than one IRQ.""")
 
-gopts.var('vfb', val="vnc=1,sdl=1,vncunused=1,vncdisplay=N,vnclisten=ADDR,display=DISPLAY,xauthority=XAUTHORITY,vncpasswd=PASSWORD,opengl=1,keymap=FILE,serial=FILE",
+gopts.var('vfb', val="vnc=1,sdl=1,vncunused=1,vncdisplay=N,vnclisten=ADDR,display=DISPLAY,xauthority=XAUTHORITY,vncpasswd=PASSWORD,opengl=1,keymap=FILE,serial=FILE,monitor=FILE",
           fn=append_value, default=[],
           use="""Make the domain a framebuffer backend.
           Both sdl=1 and vnc=1 can be enabled at the same time.
@@ -367,7 +367,8 @@ gopts.var('vfb', val="vnc=1,sdl=1,vncunused=1,vncdisplay=N,vnclisten=ADDR,displa
           given DISPLAY and XAUTHORITY, which default to the current user's
           ones.  OpenGL will be used by default unless opengl is set to 0.
           keymap overrides the XendD configured default layout file.
-	  Serial adds a second serial support to qemu.""")
+	  Serial adds a second serial support to qemu.
+          Monitor adds a backend for the stubdom monitor.""")
 
 gopts.var('vif', val="type=TYPE,mac=MAC,bridge=BRIDGE,ip=IPADDR,script=SCRIPT," + \
           "backend=DOM,vifname=NAME,rate=RATE,model=MODEL,accel=ACCEL",
@@ -815,7 +816,7 @@ def configure_vfbs(config_devs, vals):
         for (k,v) in d.iteritems():
             if not k in [ 'vnclisten', 'vncunused', 'vncdisplay', 'display',
                           'videoram', 'xauthority', 'sdl', 'vnc', 'vncpasswd',
-                          'opengl', 'keymap', 'serial' ]:
+                          'opengl', 'keymap', 'serial', 'monitor' ]:
                 err("configuration option %s unknown to vfbs" % k)
             config.append([k,v])
         if not d.has_key("keymap"):