diff --git a/dom0/aux-tools/block_cleaner_daemon.py b/dom0/aux-tools/block_cleaner_daemon.py
new file mode 100755
index 00000000..76154759
--- /dev/null
+++ b/dom0/aux-tools/block_cleaner_daemon.py
@@ -0,0 +1,53 @@
+#!/usr/bin/python
+
+import xen.lowlevel.xs
+import time
+import subprocess
+
+xs = xen.lowlevel.xs.xs()
+
+domain_list = []
+
+def setup_watches():
+    global domain_list
+
+    new_domain_list = xs.ls('', '/local/domain')
+    for dom in new_domain_list:
+        if dom not in domain_list:
+            print "Adding: %s" % dom
+            xs.watch('/local/domain/%s/backend/vbd' % dom, int(dom))
+    for dom in domain_list:
+        if dom not in new_domain_list:
+            print "Removing: %s" % dom
+            xs.unwatch('/local/domain/%s/backend/vbd' % dom, int(dom))
+    domain_list = new_domain_list
+
+def handle_vbd_state(path):
+    state = xs.read('', path)
+    if state == '6':
+        # Closed state; wait a moment to not interrupt reconnect
+        time.sleep(0.500)
+        state = xs.read('', path)
+        if state == '6':
+            # If still closed, detach device
+            path_components = path.split('/')
+            # /local/domain/<BACK XID>/backend/vbd/<FRONT XID>/<DEV>/...
+            vm_xid = path_components[6]
+            vm_dev = path_components[7]
+            if vm_xid in domain_list:
+                subprocess.call('xl', 'block-detach', vm_xid, vm_dev)
+
+def main():
+
+    xs.watch('@introduceDomain', 'reload')
+    xs.watch('@releaseDomain', 'reload')
+    setup_watches()
+    while True:
+        (path, token) = xs.read_watch()
+        if token == 'reload':
+            setup_watches()
+        else:
+            if path.endswith('/state'):
+                handle_vbd_state(path)
+
+main()
diff --git a/dom0/aux-tools/qubes-dom0-updates.cron b/dom0/aux-tools/qubes-dom0-updates.cron
index 8cf805fe..b30a0b43 100755
--- a/dom0/aux-tools/qubes-dom0-updates.cron
+++ b/dom0/aux-tools/qubes-dom0-updates.cron
@@ -4,6 +4,7 @@
 LOCAL_USER=`users | sed -e 's/root *//' | cut -d' ' -f 1`
 PIDFILE=/var/run/qubes/dom0-update-notification.pid
 NOTIFY_ICON=/usr/share/qubes/icons/dom0-update-avail.svg
+UPDATES_STAT_FILE=/var/lib/qubes/updates/dom0-updates-available
 
 # Do not allow multiple instances
 [ -r $PIDFILE ] && kill -0 `cat $PIDFILE` && exit 0
@@ -13,7 +14,7 @@ echo $$ > $PIDFILE
 trap "rm $PIDFILE" EXIT
 
 # If no updates available - exit here
-qubes-dom0-updates --check-only && exit
+qubes-dom0-update --check-only >/dev/null && exit
 RETCODE=$?
 
 if [ "$RETCODE" -ne 100 ]; then
@@ -26,6 +27,9 @@ if [ -z "$LOCAL_USER" ]; then
     exit 1
 fi
 
+# Touch stat file for qubes-manager
+touch $UPDATES_STAT_FILE
+
 # Notify about updates using system tray
 zenity --notification --window-icon=$NOTIFY_ICON --text="Qubes dom0 updates available."
 
@@ -33,3 +37,6 @@ zenity --question --title="Qubes Dom0 updates" \
       --text="There are updates for dom0 available, do you want to download them now?" || exit 0
 
 su -c "DISPLAY=:0 qubes-dom0-update --gui" $LOCAL_USER
+
+# Check if user installed updates
+yum -q check-updates && rm $UPDATES_STAT_FILE
diff --git a/dom0/aux-tools/qubes-notify-updates b/dom0/aux-tools/qubes-notify-updates
index 2e09f411..d34de46c 100755
--- a/dom0/aux-tools/qubes-notify-updates
+++ b/dom0/aux-tools/qubes-notify-updates
@@ -24,6 +24,7 @@ import os.path
 import sys
 import subprocess
 import shutil
+import grp
 from datetime import datetime
 from qubes.qubes import QubesVmCollection
 from qubes.qubes import updates_stat_file
@@ -46,6 +47,9 @@ def main():
         print >> sys.stderr, 'Domain ' + source + ' does not exists (?!)'
         exit(1)
 
+    os.umask(0002)
+    qubes_gid = grp.getgrnam('qubes').gr_gid
+    
     update_count = sys.stdin.readline(128).strip()
     if not update_count.isdigit():
         print >> sys.stderr, 'Domain ' + source + ' sent invalid number of updates: ' + update_count
@@ -55,6 +59,7 @@ def main():
         update_f = open(source_vm.dir_path + '/' + updates_stat_file, "w")
         update_f.write(update_count)
         update_f.close()
+        os.chown(source_vm.dir_path + '/' + updates_stat_file, -1, qubes_gid)
     elif source_vm.template is not None:
         # Hint about updates availability in template
         # If template is running - it will notify about updates itself
@@ -72,6 +77,7 @@ def main():
             update_f = open(stat_file, "w")
             update_f.write(update_count)
             update_f.close()
+            os.chown(stat_file, -1, qubes_gid)
         else:
             print >> sys.stderr, 'Ignoring notification of no updates'
 
diff --git a/dom0/init.d/qubes_core b/dom0/init.d/qubes_core
index dbcadccc..b491da6d 100755
--- a/dom0/init.d/qubes_core
+++ b/dom0/init.d/qubes_core
@@ -53,6 +53,11 @@ start()
     MEMINFO_DELAY_USEC=100000
     /usr/lib/qubes/meminfo-writer $MEM_CHANGE_THRESHOLD_KB $MEMINFO_DELAY_USEC &
 
+    /usr/lib/qubes/block_cleaner_daemon.py > /var/log/qubes/block_cleaner.log 2>&1 &
+
+    # Reply block events to hide mounted devices from qubes-block list (at first udev run, only / is mounted)
+    udevadm trigger --subsystem-match=block --action=add
+
     touch /var/lock/subsys/qubes_core
     success
     echo
diff --git a/dom0/qvm-core/qubes.py b/dom0/qvm-core/qubes.py
index 65c87843..2db9fd1e 100755
--- a/dom0/qvm-core/qubes.py
+++ b/dom0/qvm-core/qubes.py
@@ -74,7 +74,6 @@ default_appmenus_template_templates_subdir = "apps-template.templates"
 default_kernels_subdir = "kernels"
 default_firewall_conf_file = "firewall.xml"
 default_memory = 400
-default_servicevm_vcpus = 1
 default_kernelopts = ""
 default_kernelopts_pcidevs = "iommu=soft swiotlb=2048"
 
@@ -107,6 +106,9 @@ qubes_appmenu_create_cmd = "/usr/lib/qubes/create_apps_for_appvm.sh"
 qubes_appmenu_remove_cmd = "/usr/lib/qubes/remove_appvm_appmenus.sh"
 qubes_pciback_cmd = '/usr/lib/qubes/unbind_pci_device.sh'
 
+yum_proxy_ip = '10.137.255.254'
+yum_proxy_port = '8082'
+
 class QubesException (Exception) : pass
 
 if not dry_run:
@@ -401,7 +403,7 @@ class QubesVm(object):
                 shutil.copy(self.firewall_conf, "%s/backup/%s-firewall-%s.xml"
                         % (qubes_base_dir, self.name, time.strftime('%Y-%m-%d-%H:%M:%S')))
             self.write_firewall_conf({'allow': False, 'allowDns': False,
-                    'allowIcmp': False, 'rules': []})
+                    'allowIcmp': False, 'allowYumProxy': False, 'rules': []})
         else:
             new_netvm.connected_vms[self.qid]=self
 
@@ -848,6 +850,9 @@ class QubesVm(object):
                 "{0}/qubes-block-devices".format(domain_path),
                 '')
 
+        xs.write('', "{0}/qubes-debug-mode".format(domain_path),
+                str(int(self.debug)))
+
         # Fix permissions
         xs.set_permissions('', '{0}/device'.format(domain_path),
                 [{ 'dom': xid }])
@@ -1165,7 +1170,8 @@ class QubesVm(object):
                 "QubesFirwallRules",
                 policy = "allow" if conf["allow"] else "deny",
                 dns = "allow" if conf["allowDns"] else "deny",
-                icmp = "allow" if conf["allowIcmp"] else "deny"
+                icmp = "allow" if conf["allowIcmp"] else "deny",
+                yumProxy = "allow" if conf["allowYumProxy"] else "deny"
         )
 
         for rule in conf["rules"]:
@@ -1205,13 +1211,20 @@ class QubesVm(object):
                     os.path.basename(sys.argv[0]), err)
             return False
 
+        # Automatically enable/disable 'yum-proxy-setup' service based on allowYumProxy
+        if conf['allowYumProxy']:
+            self.services['yum-proxy-setup'] = True
+        else:
+            if self.services.has_key('yum-proxy-setup'):
+                self.services.pop('yum-proxy-setup')
+
         return True
 
     def has_firewall(self):
         return os.path.exists (self.firewall_conf)
 
     def get_firewall_conf(self):
-        conf = { "rules": list(), "allow": True, "allowDns": True, "allowIcmp": True }
+        conf = { "rules": list(), "allow": True, "allowDns": True, "allowIcmp": True, "allowYumProxy": False }
 
         try:
             tree = xml.etree.ElementTree.parse(self.firewall_conf)
@@ -1220,6 +1233,7 @@ class QubesVm(object):
             conf["allow"] = (root.get("policy") == "allow")
             conf["allowDns"] = (root.get("dns") == "allow")
             conf["allowIcmp"] = (root.get("icmp") == "allow")
+            conf["allowYumProxy"] = (root.get("yumProxy") == "allow")
 
             for element in root:
                 rule = {}
@@ -1710,10 +1724,8 @@ class QubesNetVm(QubesVm):
         attrs_config = super(QubesNetVm, self)._get_attrs_config()
         attrs_config['dir_path']['eval'] = 'value if value is not None else qubes_servicevms_dir + "/" + self.name'
         attrs_config['label']['default'] = default_servicevm_label
-        attrs_config['vcpus']['default'] = default_servicevm_vcpus
         attrs_config['memory']['default'] = 200
-        attrs_config['maxmem']['eval'] = 'self.memory'
-        
+
         # New attributes
         attrs_config['netid'] = { 'save': 'str(self.netid)', 'order': 30 }
         attrs_config['netprefix'] = { 'eval': '"10.137.{0}.".format(self.netid)' }
@@ -1969,7 +1981,7 @@ class QubesProxyVm(QubesNetVm):
             if vm.has_firewall():
                 conf = vm.get_firewall_conf()
             else:
-                conf = { "rules": list(), "allow": True, "allowDns": True, "allowIcmp": True }
+                conf = { "rules": list(), "allow": True, "allowDns": True, "allowIcmp": True, "allowYumProxy": False }
 
             xid = vm.get_xid()
             if xid < 0: # VM not active ATM
@@ -2012,6 +2024,10 @@ class QubesProxyVm(QubesNetVm):
                 iptables += "-A FORWARD -s {0} -p udp -d {1} --dport 53 -j ACCEPT\n".format(ip,self.netvm.secondary_dns)
             if conf["allowIcmp"]:
                 iptables += "-A FORWARD -s {0} -p icmp -j ACCEPT\n".format(ip)
+            if conf["allowYumProxy"]:
+                iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport {2} -j ACCEPT\n".format(ip, yum_proxy_ip, yum_proxy_port)
+            else:
+                iptables += "-A FORWARD -s {0} -p tcp -d {1} --dport {2} -j DROP\n".format(ip, yum_proxy_ip, yum_proxy_port)
 
             iptables += "-A FORWARD -s {0} -j {1}\n".format(ip, default_action)
             iptables += "COMMIT\n"
diff --git a/dom0/qvm-tools/qvm-firewall b/dom0/qvm-tools/qvm-firewall
index f85bc6ff..581fd3ca 100755
--- a/dom0/qvm-tools/qvm-firewall
+++ b/dom0/qvm-tools/qvm-firewall
@@ -189,7 +189,8 @@ def display_firewall(conf):
     print "Firewall policy: %s" % (
             "ALLOW all traffic except" if conf['allow'] else "DENY all traffic except")
     print "ICMP: %s" % ("ALLOW" if conf['allowIcmp'] else 'DENY')
-    print "DMS: %s" % ("ALLOW" if conf['allowDns'] else 'DENY')
+    print "DNS: %s" % ("ALLOW" if conf['allowDns'] else 'DENY')
+    print "Qubes yum proxy: %s" % ("ALLOW" if conf['allowYumProxy'] else 'DENY')
     list_rules(conf['rules'])
 
 def add_rule(conf, args):
@@ -251,6 +252,8 @@ def main():
             help="Set ICMP access (allow/deny)")
     parser.add_option ("-D", "--dns", dest="set_dns", action="store", default=None,
             help="Set DNS access (allow/deny)")
+    parser.add_option ("-Y", "--yum-proxy", dest="set_yum_proxy", action="store", default=None,
+            help="Set access to Qubes yum proxy (allow/deny)")
 
     parser.add_option ("-n", "--numeric", dest="numeric", action="store_true", default=False,
             help="Display port numbers instead of services (makes sense only with --list)")
@@ -261,7 +264,7 @@ def main():
     vmname = args[0]
     args = args[1:]
 
-    if options.do_add or options.do_del or options.set_policy or options.set_icmp or options.set_dns:
+    if options.do_add or options.do_del or options.set_policy or options.set_icmp or options.set_dns or options.set_yum_proxy:
         options.do_list = False
     qvm_collection = QubesVmCollection()
     if options.do_list:
@@ -289,6 +292,9 @@ def main():
     if options.set_dns:
         conf['allowDns'] = allow_deny_value(options.set_dns)
         changed = True
+    if options.set_yum_proxy:
+        conf['allowYumProxy'] = allow_deny_value(options.set_yum_proxy)
+        changed = True
 
     if options.do_add:
         load_services()
@@ -308,6 +314,7 @@ def main():
         if vm.is_running():
             if vm.netvm is not None and vm.netvm.is_proxyvm():
                 vm.netvm.write_iptables_xenstore_entry()
+        qvm_collection.save()
 
     if not options.do_list:
         qvm_collection.unlock_db()
diff --git a/dom0/qvm-tools/qvm-ls b/dom0/qvm-tools/qvm-ls
index d4e4e0ee..ac94a71d 100755
--- a/dom0/qvm-tools/qvm-ls
+++ b/dom0/qvm-tools/qvm-ls
@@ -76,6 +76,9 @@ fields = {
 
     "label" : {"func" : "vm.label.name"},
 
+    "kernel" : {"func" : "('*' if vm.uses_default_kernel else '') + str(vm.kernel) if hasattr(vm, 'kernel') else 'n/a'"},
+    "kernelopts" : {"func" : "('*' if vm.uses_default_kernelopts else '') + str(vm.kernelopts) if hasattr(vm, 'kernelopts') else 'n/a'"},
+
     "on" : {"func" : "'*' if vm.is_running() else ''"}
 
 }
@@ -102,6 +105,10 @@ def main():
                        action="store_true", default=False,
                        help="Show VM disk utilization statistics")
 
+    parser.add_option ("-k", "--kernel", dest="kernel",
+                       action="store_true", default=False,
+                       help="Show VM kernel options")
+
     parser.add_option ("-i", "--ids", dest="ids",
                        action="store_true", default=False,
                        help="Show Qubes and Xen id#s")
@@ -141,6 +148,9 @@ def main():
             fields_to_display.remove ("netvm")
         fields_to_display += ["priv-curr", "priv-max", "root-curr", "root-max", "disk" ]
 
+    if (options.kernel):
+        fields_to_display += ["kernel", "kernelopts" ]
+
     
     vms_list = [vm for vm in qvm_collection.values()]
     no_vms = len (vms_list)
diff --git a/dom0/qvm-tools/qvm-service b/dom0/qvm-tools/qvm-service
new file mode 100755
index 00000000..6dbb8a6c
--- /dev/null
+++ b/dom0/qvm-tools/qvm-service
@@ -0,0 +1,97 @@
+#!/usr/bin/python
+#
+# The Qubes OS Project, http://www.qubes-os.org
+#
+# Copyright (C) 2012  Marek Marczykowski <marmarek@invisiblethingslab.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+#
+
+from qubes.qubes import QubesVmCollection
+from optparse import OptionParser;
+import subprocess
+import sys
+import re
+
+def do_list(vm):
+    max_len = 0
+    for s in vm.services.keys():
+        max_len = max(max_len, len(s))
+    fmt="{{0:<{0}}}: {{1}}".format(max_len)
+
+    for s in vm.services.keys():
+        print fmt.format (s, "Enabled" if vm.services[s] else "Disabled")
+
+
+def main():
+    usage =  "usage: %prog <vm-name> [action] [service]\n"
+    parser = OptionParser (usage)
+    parser.add_option ("-l", "--list", dest="do_list", action="store_true", default=True,
+            help="List services (default action)")
+    parser.add_option ("-e", "--enable", dest="set_enable", action="store_true", default=False,
+            help="Enable service")
+    parser.add_option ("-d", "--disable", dest="set_disable", action="store_true", default=False,
+            help="Disable service")
+    parser.add_option ("-D", "--default", dest="set_default", action="store_true", default=False,
+            help="Reset service to its default state (remove from the list)")
+
+    (options, args) = parser.parse_args ()
+    if (len (args) < 1):
+        parser.error ("You must specify VM name!")
+    vmname = args[0]
+    args = args[1:]
+
+    if options.set_enable or options.set_disable or options.set_default:
+        if (len(args) < 1):
+            parser.error("You must specify service name!")
+        options.do_list = False
+
+    qvm_collection = QubesVmCollection()
+    if options.do_list:
+        qvm_collection.lock_db_for_reading()
+        qvm_collection.load()
+        qvm_collection.unlock_db()
+    else:
+        qvm_collection.lock_db_for_writing()
+        qvm_collection.load()
+
+    vm = qvm_collection.get_vm_by_name(vmname)
+    if vm is None:
+        print >> sys.stderr, "A VM with the name '{0}' does not exist in the system.".format(vmname)
+        exit(1)
+
+    changed = False
+    if options.do_list:
+        do_list(vm)
+    elif options.set_enable:
+        vm.services[args[0]] = True
+        changed = True
+    elif options.set_disable:
+        vm.services[args[0]] = False
+        changed = True
+    elif options.set_default:
+        if vm.services.has_key(args[0]):
+            vm.services.pop(args[0])
+            changed = True
+
+    if changed:
+        qvm_collection.save()
+
+    if not options.do_list:
+        qvm_collection.unlock_db()
+
+
+main()
diff --git a/network/filter-qubes-yum b/network/filter-qubes-yum
new file mode 100644
index 00000000..b244f3cf
--- /dev/null
+++ b/network/filter-qubes-yum
@@ -0,0 +1,6 @@
+.*/repodata/[A-Za-z0-9-]*\(primary\|filelist\|comps\(-[a-z0-9]*\)\?\|other\|prestodelta\)\.\(sqlite\|xml\)\(\.bz2\|\.gz\)\?$
+.*/repodata/repomd\.xml$
+.*\.rpm$
+.*\.drpm$
+mirrors.fedoraproject.org:443
+^http://mirrors\..*/mirrorlist
diff --git a/network/iptables b/network/iptables
index 6e6e6d89..5977ff22 100644
--- a/network/iptables
+++ b/network/iptables
@@ -4,7 +4,9 @@
 :OUTPUT ACCEPT [0:0]
 :POSTROUTING ACCEPT [0:0]
 :PR-QBS - [0:0]
+:PR-QBS-SERVICES - [0:0]
 -A PREROUTING -j PR-QBS
+-A PREROUTING -j PR-QBS-SERVICES
 -A POSTROUTING -o vif+ -j ACCEPT
 -A POSTROUTING -o lo -j ACCEPT
 -A POSTROUTING -j MASQUERADE
diff --git a/network/tinyproxy-qubes-yum.conf b/network/tinyproxy-qubes-yum.conf
new file mode 100644
index 00000000..43b5082f
--- /dev/null
+++ b/network/tinyproxy-qubes-yum.conf
@@ -0,0 +1,30 @@
+User tinyproxy
+Group tinyproxy
+Port 8082
+Timeout 60
+DefaultErrorFile "/usr/share/tinyproxy/default.html"
+
+#StatHost "tinyproxy.stats"
+StatFile "/usr/share/tinyproxy/stats.html"
+Syslog On
+LogLevel Notice
+PidFile "/var/run/tinyproxy/tinyproxy-qubes-yum.pid"
+
+MaxClients 50
+MinSpareServers 2
+MaxSpareServers 10
+StartServers 2
+MaxRequestsPerChild 0
+ViaProxyName "tinyproxy"
+
+Allow 127.0.0.1
+Allow 10.137.0.0/16
+
+
+Filter "/etc/tinyproxy/filter-qubes-yum"
+FilterURLs On
+#FilterExtended On
+#FilterCaseSensitive On
+FilterDefaultDeny Yes
+ConnectPort 443
+
diff --git a/network/vif-route-qubes b/network/vif-route-qubes
index c8070177..6809028b 100755
--- a/network/vif-route-qubes
+++ b/network/vif-route-qubes
@@ -53,8 +53,9 @@ if [ "${ip}" ] ; then
 	for addr in ${ip} ; do
 		${cmdprefix} ip route ${ipcmd} ${addr} dev ${vif} metric $metric
 	done
-		echo ${cmdprefix} iptables -t raw $iptables_cmd -i ${vif} \! -s ${ip} -j DROP
-		${cmdprefix} iptables -t raw $iptables_cmd -i ${vif} \! -s ${ip} -j DROP
+	${cmdprefix} iptables -t raw $iptables_cmd -i ${vif} \! -s ${ip} -j DROP
+	back_ip=${ip%.*}.1
+	${cmdprefix} ip addr ${ipcmd} ${back_ip}/32 dev ${vif}
 fi
 
 log debug "Successful vif-route-qubes $command for $vif."
diff --git a/qrexec/qrexec.h b/qrexec/qrexec.h
index e3a556ea..4313d119 100644
--- a/qrexec/qrexec.h
+++ b/qrexec/qrexec.h
@@ -19,6 +19,8 @@
  *
  */
 
+/* See also http://wiki.qubes-os.org/trac/wiki/Qrexec */
+
 #define QREXEC_DAEMON_SOCKET_DIR "/var/run/qubes"
 #define MAX_FDS 256
 #define MAX_DATA_CHUNK 4096
@@ -30,26 +32,52 @@
 #define MEMINFO_WRITER_PIDFILE "/var/run/meminfo-writer.pid"
 
 enum {
+	/* messages from qrexec_client to qrexec_daemon (both in dom0) */
+	/* start process in VM and pass its stdin/out/err to dom0 */
 	MSG_CLIENT_TO_SERVER_EXEC_CMDLINE = 0x100,
+	/* start process in VM discarding its stdin/out/err (connect to /dev/null) */
 	MSG_CLIENT_TO_SERVER_JUST_EXEC,
+	/* connect to existing process in VM to receive its stdin/out/err 
+	 * struct connect_existing_params passed as data */
 	MSG_CLIENT_TO_SERVER_CONNECT_EXISTING,
 
+	/* messages qrexec_daemon(dom0)->qrexec_agent(VM) */
+	/* same as MSG_CLIENT_TO_SERVER_CONNECT_EXISTING */
 	MSG_SERVER_TO_AGENT_CONNECT_EXISTING,
+	/* same as MSG_CLIENT_TO_SERVER_EXEC_CMDLINE */
 	MSG_SERVER_TO_AGENT_EXEC_CMDLINE,
+	/* same as MSG_CLIENT_TO_SERVER_JUST_EXEC */
 	MSG_SERVER_TO_AGENT_JUST_EXEC,
+	/* pass data to process stdin */
 	MSG_SERVER_TO_AGENT_INPUT,
+	/* detach from process; qrexec_agent should close pipes to process
+	 * stdin/out/err; it's up to the VM child process if it cause its termination */
 	MSG_SERVER_TO_AGENT_CLIENT_END,
 
+	/* flow control, qrexec_daemon->qrexec_agent */
+	/* suspend reading of named fd from child process */
 	MSG_XOFF,
+	/* resume reading of named fd from child process */
 	MSG_XON,
 
+	/* messages qrexec_agent(VM)->qrexec_daemon(dom0) */
+	/* pass data from process stdout */
 	MSG_AGENT_TO_SERVER_STDOUT,
+	/* pass data from process stderr */
 	MSG_AGENT_TO_SERVER_STDERR,
+	/* inform that process terminated and pass its exit code; this should be
+	 * send after all data from stdout/err are send */
 	MSG_AGENT_TO_SERVER_EXIT_CODE,
+	/* call Qubes RPC service
+	 * struct trigger_connect_params passed as data */
 	MSG_AGENT_TO_SERVER_TRIGGER_CONNECT_EXISTING,
 
+	/* messages qrexec_daemon->qrexec_client (both in dom0) */
+	/* same as MSG_AGENT_TO_SERVER_STDOUT */
 	MSG_SERVER_TO_CLIENT_STDOUT,
+	/* same as MSG_AGENT_TO_SERVER_STDERR */
 	MSG_SERVER_TO_CLIENT_STDERR,
+	/* same as MSG_AGENT_TO_SERVER_EXIT_CODE */
 	MSG_SERVER_TO_CLIENT_EXIT_CODE
 };
 
diff --git a/qrexec/qrexec_agent.c b/qrexec/qrexec_agent.c
index 0741f8e8..93fa100d 100644
--- a/qrexec/qrexec_agent.c
+++ b/qrexec/qrexec_agent.c
@@ -113,28 +113,6 @@ void no_colon_in_cmd()
 	exit(1);
 }
 
-void do_exec_directly(char *cmd)
-{
-	struct passwd *pwd;
-	char *sep = index(cmd, ':');
-	if (!sep)
-		no_colon_in_cmd();
-	*sep = 0;
-	pwd = getpwnam(cmd);
-	if (!pwd) {
-		perror("getpwnam");
-		exit(1);
-	}
-	setgid(pwd->pw_gid);
-	initgroups(cmd, pwd->pw_gid);
-	setuid(pwd->pw_uid);
-	setenv("HOME", pwd->pw_dir, 1);
-	setenv("USER", cmd, 1);
-	execl(sep + 1, sep + 1, NULL);
-	perror("execl");
-	exit(1);
-}
-
 void do_exec(char *cmd)
 {
 	char *sep = index(cmd, ':');
@@ -144,8 +122,6 @@ void do_exec(char *cmd)
 	signal(SIGCHLD, SIG_DFL);
 	signal(SIGPIPE, SIG_DFL);
 
-	if (!strcmp(cmd, "directly"))
-		do_exec_directly(sep + 1);
 	execl("/bin/su", "su", "-", cmd, "-c", sep + 1, NULL);
 	perror("execl");
 	exit(1);
diff --git a/rpm_spec/core-dom0.spec b/rpm_spec/core-dom0.spec
index f6ec33e1..4de15029 100644
--- a/rpm_spec/core-dom0.spec
+++ b/rpm_spec/core-dom0.spec
@@ -114,6 +114,7 @@ cp aux-tools/qubes-receive-updates $RPM_BUILD_ROOT/usr/lib/qubes/
 cp ../misc/block_add_change $RPM_BUILD_ROOT/usr/lib/qubes/
 cp ../misc/block_remove $RPM_BUILD_ROOT/usr/lib/qubes/
 cp ../misc/block_cleanup $RPM_BUILD_ROOT/usr/lib/qubes/
+cp aux-tools/block_cleaner_daemon.py $RPM_BUILD_ROOT/usr/lib/qubes/
 
 mkdir -p $RPM_BUILD_ROOT/etc/qubes_rpc/policy
 cp ../qubes_rpc/qubes.Filecopy.policy $RPM_BUILD_ROOT/etc/qubes_rpc/policy/qubes.Filecopy
@@ -344,6 +345,7 @@ fi
 /usr/lib/qubes/block_add_change
 /usr/lib/qubes/block_remove
 /usr/lib/qubes/block_cleanup
+/usr/lib/qubes/block_cleaner_daemon.py*
 %attr(4750,root,qubes) /usr/lib/qubes/qfile-dom0-unpacker
 %attr(770,root,qubes) %dir /var/lib/qubes
 %attr(770,root,qubes) %dir /var/lib/qubes/vm-templates
diff --git a/rpm_spec/core-vm.spec b/rpm_spec/core-vm.spec
index 0b9d5ffd..06004ea5 100644
--- a/rpm_spec/core-vm.spec
+++ b/rpm_spec/core-vm.spec
@@ -37,6 +37,7 @@ Requires:   yum-plugin-post-transaction-actions
 Requires:   NetworkManager >= 0.8.1-1
 Requires:	/usr/bin/mimeopen
 Requires:   /sbin/ethtool
+Requires:   tinyproxy
 Provides:   qubes-core-vm
 Obsoletes:  qubes-core-commonvm
 Obsoletes:  qubes-core-appvm
@@ -80,7 +81,7 @@ su user -c 'touch /home/user/.gnome2/nautilus-scripts/.scripts_created2'
 
 %install
 
-install -D misc/fstab $RPM_BUILD_ROOT/etc/fstab
+install -m 0644 -D misc/fstab $RPM_BUILD_ROOT/etc/fstab
 install -d $RPM_BUILD_ROOT/etc/init.d
 install vm-init.d/* $RPM_BUILD_ROOT/etc/init.d/
 
@@ -116,7 +117,7 @@ mkdir -p $RPM_BUILD_ROOT/usr/lib/qubes
 
 install -D misc/qubes_core.modules $RPM_BUILD_ROOT/etc/sysconfig/modules/qubes_core.modules
 
-install network/qubes_network.rules $RPM_BUILD_ROOT/etc/udev/rules.d/99-qubes_network.rules
+install -m 0644 network/qubes_network.rules $RPM_BUILD_ROOT/etc/udev/rules.d/99-qubes_network.rules
 install network/qubes_setup_dnat_to_ns $RPM_BUILD_ROOT/usr/lib/qubes
 install network/qubes_fix_nm_conf.sh $RPM_BUILD_ROOT/usr/lib/qubes
 install network/setup_ip $RPM_BUILD_ROOT/usr/lib/qubes/
@@ -126,7 +127,12 @@ ln -s /usr/lib/qubes/qubes_setup_dnat_to_ns $RPM_BUILD_ROOT/etc/dhclient.d/qubes
 install -d $RPM_BUILD_ROOT/etc/NetworkManager/dispatcher.d/
 install network/{qubes_nmhook,30-qubes_external_ip} $RPM_BUILD_ROOT/etc/NetworkManager/dispatcher.d/
 install -D network/vif-route-qubes $RPM_BUILD_ROOT/etc/xen/scripts/vif-route-qubes
-install -D network/iptables $RPM_BUILD_ROOT/etc/sysconfig/iptables
+install -m 0644 -D network/iptables $RPM_BUILD_ROOT/etc/sysconfig/iptables
+install -m 0644 -D network/tinyproxy-qubes-yum.conf $RPM_BUILD_ROOT/etc/tinyproxy/tinyproxy-qubes-yum.conf
+install -m 0644 -D network/filter-qubes-yum $RPM_BUILD_ROOT/etc/tinyproxy/filter-qubes-yum
+
+install -d $RPM_BUILD_ROOT/etc/yum.conf.d
+touch $RPM_BUILD_ROOT/etc/yum.conf.d/qubes-proxy.conf
 
 install -d $RPM_BUILD_ROOT/usr/sbin
 install network/qubes_firewall $RPM_BUILD_ROOT/usr/sbin/
@@ -233,6 +239,12 @@ fi
 # Remove ip_forward setting from sysctl, so NM will not reset it
 sed 's/^net.ipv4.ip_forward.*/#\0/'  -i /etc/sysctl.conf
 
+if ! grep -q '/etc/yum\.conf\.d/qubes-proxy\.conf'; then
+  echo >> /etc/yum.conf
+  echo '# Yum does not support inclusion of config dir...' >> /etc/yum.conf
+  echo 'include=file:///etc/yum.conf.d/qubes-proxy.conf' >> /etc/yum.conf
+fi
+
 # Prevent unnecessary updates in VMs:
 sed -i -e '/^exclude = kernel/d' /etc/yum.conf
 echo 'exclude = kernel, xorg-x11-drv-*, xorg-x11-drivers, xorg-x11-server-*' >> /etc/yum.conf
@@ -334,10 +346,13 @@ rm -rf $RPM_BUILD_ROOT
 /etc/sudoers.d/qubes
 /etc/sysconfig/iptables
 /etc/sysconfig/modules/qubes_core.modules
+/etc/tinyproxy/filter-qubes-yum
+/etc/tinyproxy/tinyproxy-qubes-yum.conf
 /etc/udev/rules.d/50-qubes_memory.rules
 /etc/udev/rules.d/99-qubes_block.rules
 /etc/udev/rules.d/99-qubes_network.rules
 /etc/xen/scripts/vif-route-qubes
+/etc/yum.conf.d/qubes-proxy.conf
 /etc/yum.repos.d/qubes.repo
 /etc/yum/post-actions/qubes_trigger_sync_appmenus.action
 /lib/firmware/updates
@@ -422,6 +437,7 @@ The Qubes core startup configuration for SysV init (or upstart).
 /etc/init.d/qubes_core_netvm
 /etc/init.d/qubes-firewall
 /etc/init.d/qubes-netwatcher
+/etc/init.d/qubes-yum-proxy
 
 %post sysvinit
 
@@ -454,6 +470,8 @@ chkconfig --add qubes_firewall || echo "WARNING: Cannot add service qubes_core!"
 chkconfig qubes_firewall on || echo "WARNING: Cannot enable service qubes_core!"
 chkconfig --add qubes-netwatcher || echo "WARNING: Cannot add service qubes_core!"
 chkconfig qubes-netwatcher on || echo "WARNING: Cannot enable service qubes_core!"
+chkconfig --add qubes-yum-proxy || echo "WARNING: Cannot add service qubes-yum-proxy!"
+chkconfig qubes-yum-proxy on || echo "WARNING: Cannot enable service qubes-yum-proxy!"
 
 # TODO: make this not display the silly message about security context...
 sed -i s/^id:.:initdefault:/id:3:initdefault:/ /etc/inittab
@@ -466,6 +484,7 @@ if [ "$1" = 0 ] ; then
     chkconfig qubes_core_appvm off
     chkconfig qubes-firewall off
     chkconfig qubes-netwatcher off
+    chkconfig qubes-yum-proxy off
 fi
 
 %package systemd
@@ -495,6 +514,7 @@ The Qubes core startup configuration for SystemD init.
 /lib/systemd/system/qubes-sysinit.service
 /lib/systemd/system/qubes-update-check.service
 /lib/systemd/system/qubes-update-check.timer
+/lib/systemd/system/qubes-yum-proxy.service
 %dir /usr/lib/qubes/init
 /usr/lib/qubes/init/prepare-dvm.sh
 /usr/lib/qubes/init/network-proxy-setup.sh
@@ -509,7 +529,7 @@ The Qubes core startup configuration for SystemD init.
 
 %post systemd
 
-for srv in qubes-dvm qubes-meminfo-writer qubes-qrexec-agent qubes-sysinit qubes-misc-post qubes-netwatcher qubes-network qubes-firewall; do
+for srv in qubes-dvm qubes-meminfo-writer qubes-qrexec-agent qubes-sysinit qubes-misc-post qubes-netwatcher qubes-network qubes-firewall qubes-yum-proxy; do
     /bin/systemctl enable $srv.service 2> /dev/null
 done
 
diff --git a/version_dom0 b/version_dom0
index 18f812ff..efb45341 100644
--- a/version_dom0
+++ b/version_dom0
@@ -1 +1 @@
-2.0.23
+2.0.25
diff --git a/vm-init.d/qubes-yum-proxy b/vm-init.d/qubes-yum-proxy
new file mode 100755
index 00000000..52f329ba
--- /dev/null
+++ b/vm-init.d/qubes-yum-proxy
@@ -0,0 +1,121 @@
+#!/bin/sh
+#
+# tinyproxy     Startup script for the tinyproxy server as Qubes yum proxy
+#
+# chkconfig:   - 85 15
+# description: small, efficient HTTP/SSL proxy daemon
+#
+# processname: tinyproxy
+# config:      /etc/tinyproxy/tinyproxy-qubes-yum.conf
+# config:      /etc/sysconfig/tinyproxy-qubes-yum
+# pidfile:     /var/run/tinyproxy/tinyproxy-qubes-yum.pid
+#
+# Note: pidfile is created by tinyproxy in its config
+# see PidFile in the configuration file.
+
+# Source function library.
+. /etc/rc.d/init.d/functions
+
+# Source networking configuration.
+.  /etc/sysconfig/network
+
+# Check that networking is up.
+[ "$NETWORKING" = "no" ] && exit 0
+
+exec="/usr/sbin/tinyproxy"
+prog=$(basename $exec)
+config="/etc/tinyproxy/tinyproxy-qubes-yum.conf"
+pidfile="/var/run/tinyproxy/tinyproxy-qubes-yum.pid"
+
+[ -e /etc/sysconfig/tinyproxy-qubes-yum ] && . /etc/sysconfig/tinyproxy-qubes-yum
+
+lockfile=/var/lock/subsys/tinyproxy-qubes-yum
+
+start() {
+    type=`/usr/bin/xenstore-read qubes_vm_type`
+    start_yum_proxy=`/usr/bin/xenstore-read qubes-service/qubes-yum-proxy 2>/dev/null`
+    if [ -z "$start_yum_proxy" ] && [ "$type" != "NetVM" ] || [ "$start_yum_proxy" != "1" ]; then
+        # Yum proxy disabled
+        exit 0
+    fi
+
+    [ -x $exec ] || exit 5
+    [ -f $config ] || exit 6
+    # setup network redirection
+    /sbin/iptables -I INPUT -i vif+ -p tcp --dport 8082 -j ACCEPT
+    /sbin/iptables -t nat -A PR-QBS-SERVICES -i vif+ -d 10.137.255.254 -p tcp --dport 8082 -j REDIRECT
+
+    echo -n $"Starting $prog (as Qubes yum proxy): "
+    daemon $exec -c $config
+    retval=$?
+    echo
+    [ $retval -eq 0 ] && touch $lockfile
+    return $retval
+}
+
+stop() {
+    echo -n $"Stopping $prog: "
+    killproc -p $pidfile $prog
+    retval=$?
+    echo
+    /sbin/iptables -t nat -D PR-QBS-SERVICES -i vif+ -d 10.137.255.254 -p tcp --dport 8082 -j REDIRECT
+    /sbin/iptables -D INPUT -i vif+ -p tcp --dport 8082 -j ACCEPT
+    [ $retval -eq 0 ] && rm -f $lockfile
+    return $retval
+}
+
+restart() {
+    stop
+    start
+}
+
+reload() {
+    echo -n $"Reloading $prog: "
+    killproc -p $pidfile $prog -HUP
+    echo
+}
+
+force_reload() {
+    restart
+}
+
+rh_status() {
+    status $prog
+}
+
+rh_status_q() {
+    rh_status >/dev/null 2>&1
+}
+
+case "$1" in
+    start)
+        rh_status_q && exit 0
+        $1
+        ;;
+    stop)
+        rh_status_q || exit 0
+        $1
+        ;;
+    restart)
+        $1
+        ;;
+    reload)
+        rh_status_q || exit 7
+        $1
+        ;;
+    force-reload)
+        force_reload
+        ;;
+    status)
+        rh_status
+        ;;
+    condrestart|try-restart)
+        rh_status_q || exit 0
+        restart
+        ;;
+    *)
+        echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}"
+        exit 2
+esac
+exit $?
+
diff --git a/vm-init.d/qubes_core b/vm-init.d/qubes_core
index 7193d386..de194f89 100755
--- a/vm-init.d/qubes_core
+++ b/vm-init.d/qubes_core
@@ -36,6 +36,13 @@ start()
 		echo "ZONE=\"$timezone\"" >> /etc/sysconfig/clock
 	fi
 
+	yum_proxy_setup=$(/usr/bin/xenstore-read qubes-service/yum-proxy-setup 2> /dev/null)
+	if [ "$yum_proxy_setup" != "0" ]; then
+		echo proxy=http://10.137.255.254:8082/ > /etc/yum.conf.d/qubes-proxy.conf
+	else
+		echo > /etc/yum.conf.d/qubes-proxy.conf
+	fi
+
 	# Set IP address again (besides action in udev rules); this is needed by
 	# DispVM (to override DispVM-template IP) and in case when qubes_ip was
 	# called by udev before loading evtchn kernel module - in which case
diff --git a/vm-systemd/misc-post.sh b/vm-systemd/misc-post.sh
index 9ebdf2e0..dbefd432 100755
--- a/vm-systemd/misc-post.sh
+++ b/vm-systemd/misc-post.sh
@@ -1,5 +1,11 @@
 #!/bin/sh
 
+if [ -f /var/run/qubes-service/yum-proxy-setup ]; then
+    echo proxy=http://10.137.255.254:8082/ > /etc/yum.conf.d/qubes-proxy.conf
+else
+    echo > /etc/yum.conf.d/qubes-proxy.conf
+fi
+
 # Set IP address again (besides action in udev rules); this is needed by
 # DispVM (to override DispVM-template IP) and in case when qubes_ip was
 # called by udev before loading evtchn kernel module - in which case
diff --git a/vm-systemd/qubes-sysinit.sh b/vm-systemd/qubes-sysinit.sh
index 02e2a9a0..0c8e9d0f 100755
--- a/vm-systemd/qubes-sysinit.sh
+++ b/vm-systemd/qubes-sysinit.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # List of services enabled by default (in case of absence of xenstore entry)
-DEFAULT_ENABLED_NETVM="network-manager qubes-network qubes-update-check"
+DEFAULT_ENABLED_NETVM="network-manager qubes-network qubes-update-check qubes-yum-proxy"
 DEFAULT_ENABLED_PROXYVM="meminfo-writer qubes-network qubes-firewall qubes-netwatcher qubes-update-check"
 DEFAULT_ENABLED_APPVM="meminfo-writer cups qubes-update-check"
 DEFAULT_ENABLED_TEMPLATEVM=$DEFAULT_ENABLED_APPVM
@@ -61,3 +61,11 @@ if [ -n "$timezone" ]; then
     echo "# Clock configuration autogenerated based on Qubes dom0 settings" > /etc/sysconfig/clock
     echo "ZONE=\"$timezone\"" >> /etc/sysconfig/clock
 fi
+
+# Prepare environment for other services
+echo > /var/run/qubes-service-environment
+
+debug_mode=`$XS_READ qubes-debug-mode 2> /dev/null`
+if [ -n "$debug_mode" -a "$debug_mode" -gt 0 ]; then
+    echo "GUI_OPTS=-vv" >> /var/run/qubes-service-environment
+fi
diff --git a/vm-systemd/qubes-update-check.service b/vm-systemd/qubes-update-check.service
index 5566eda4..6ac37e3d 100644
--- a/vm-systemd/qubes-update-check.service
+++ b/vm-systemd/qubes-update-check.service
@@ -4,4 +4,4 @@ ConditionPathExists=/var/run/qubes-service/qubes-update-check
 
 [Service]
 Type=oneshot
-ExecStart=/usr/lib/qubes/qrexec_client_vm dom0 qubes.NotifyUpdates /bin/sh -c 'yum -q check-update|wc -l'
+ExecStart=/usr/lib/qubes/qrexec_client_vm dom0 qubes.NotifyUpdates /bin/sh -c 'yum -q check-update >/dev/null; [ $? -eq 100 ] && echo 1 || echo 0'
diff --git a/vm-systemd/qubes-yum-proxy.service b/vm-systemd/qubes-yum-proxy.service
new file mode 100644
index 00000000..b03c34de
--- /dev/null
+++ b/vm-systemd/qubes-yum-proxy.service
@@ -0,0 +1,15 @@
+[Unit]
+Description=Qubes yum proxy (tinyproxy)
+ConditionPathExists=/var/run/qubes-service/qubes-yum-proxy
+After=iptables.service
+
+[Service]
+ExecStartPre=/usr/bin/install -d --owner tinyproxy --group tinyproxy /var/run/tinyproxy
+ExecStartPre=/sbin/iptables -I INPUT -i vif+ -p tcp --dport 8082 -j ACCEPT
+ExecStartPre=/sbin/iptables -t nat -A PR-QBS-SERVICES -i vif+ -d 10.137.255.254 -p tcp --dport 8082 -j REDIRECT
+ExecStart=/usr/sbin/tinyproxy -d -c /etc/tinyproxy/tinyproxy-qubes-yum.conf
+ExecStopPost=/sbin/iptables -t nat -D PR-QBS-SERVICES -i vif+ -d 10.137.255.254 -p tcp --dport 8082 -j REDIRECT
+ExecStopPost=/sbin/iptables -D INPUT -i vif+ -p tcp --dport 8082 -j ACCEPT
+
+[Install]
+WantedBy=multi-user.target