diff --git a/qubes/storage/lvm.py b/qubes/storage/lvm.py
index 18756acf..178019dd 100644
--- a/qubes/storage/lvm.py
+++ b/qubes/storage/lvm.py
@@ -102,7 +102,8 @@ class ThinPool(qubes.storage.Pool):
             'name': self.name,
             'volume_group': self.volume_group,
             'thin_pool': self.thin_pool,
-            'driver': ThinPool.driver
+            'driver': ThinPool.driver,
+            'revisions_to_keep': self.revisions_to_keep,
         }
 
     def destroy(self):
@@ -702,6 +703,12 @@ def qubes_lvm(cmd, log=logging.getLogger('qubes.storage.lvm')):
     p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
         close_fds=True, env=environ)
     out, err = p.communicate()
+    err = err.decode()
+    # Filter out warning about intended over-provisioning.
+    # Upstream discussion about missing option to silence it:
+    # https://bugzilla.redhat.com/1347008
+    err = '\n'.join(line for line in err.splitlines()
+        if 'exceeds the size of thin pool' not in line)
     return_code = p.returncode
     if out:
         log.debug(out)
@@ -709,6 +716,7 @@ def qubes_lvm(cmd, log=logging.getLogger('qubes.storage.lvm')):
         log.warning(err)
     elif return_code != 0:
         assert err, "Command exited unsuccessful, but printed nothing to stderr"
+        err = err.replace('%', '%%')
         raise qubes.storage.StoragePoolException(err)
     return True
 
diff --git a/qubes/tests/extra.py b/qubes/tests/extra.py
index d93b8cc2..9eb55c92 100644
--- a/qubes/tests/extra.py
+++ b/qubes/tests/extra.py
@@ -66,8 +66,9 @@ class VMWrapper(object):
     def __hash__(self):
         return hash(self._vm)
 
-    def start(self):
-        return self._loop.run_until_complete(self._vm.start())
+    def start(self, start_guid=True):
+        return self._loop.run_until_complete(
+            self._vm.start(start_guid=start_guid))
 
     def shutdown(self):
         return self._loop.run_until_complete(self._vm.shutdown())
diff --git a/qubes/tests/integ/pvgrub.py b/qubes/tests/integ/pvgrub.py
index fa78f03b..53a699bd 100644
--- a/qubes/tests/integ/pvgrub.py
+++ b/qubes/tests/integ/pvgrub.py
@@ -70,7 +70,7 @@ class TC_40_PVGrub(object):
 
     def get_kernel_version(self, vm):
         if self.template.startswith('fedora-'):
-            cmd_get_kernel_version = 'rpm -q kernel-core|sort -n|tail -1|' \
+            cmd_get_kernel_version = 'rpm -q kernel-core|sort -V|tail -1|' \
                                      'cut -d - -f 3-'
         elif self.template.startswith('debian-'):
             cmd_get_kernel_version = \
diff --git a/qubes/vm/qubesvm.py b/qubes/vm/qubesvm.py
index 4bfc0317..85272c8e 100644
--- a/qubes/vm/qubesvm.py
+++ b/qubes/vm/qubesvm.py
@@ -912,9 +912,20 @@ class QubesVM(qubes.vm.mix.net.NetVMMixin, qubes.vm.BaseVM):
 
             self.log.info('Starting {}'.format(self.name))
 
-            yield from self.fire_event_async('domain-pre-start',
-                pre_event=True,
-                start_guid=start_guid, mem_required=mem_required)
+            try:
+                yield from self.fire_event_async('domain-pre-start',
+                    pre_event=True,
+                    start_guid=start_guid, mem_required=mem_required)
+            except Exception as exc:
+                yield from self.fire_event_async('domain-start-failed',
+                    reason=str(exc))
+                raise
+
+            for devclass in self.devices:
+                for dev in self.devices[devclass].persistent():
+                    if isinstance(dev, qubes.devices.UnknownDevice):
+                        raise qubes.exc.QubesException(
+                            '{} device {} not available'.format(devclass, dev))
 
             qmemman_client = None
             try: