diff --git a/qubes/vm/qubesvm.py b/qubes/vm/qubesvm.py
index dd76c4a00..f7dc81c98 100644
--- a/qubes/vm/qubesvm.py
+++ b/qubes/vm/qubesvm.py
@@ -1222,8 +1222,12 @@ async def start(self, start_guid=True, notify_function=None,
 
                 self._update_libvirt_domain()
 
+                free_mem = subprocess.check_output(["xl", "info", "free_memory"]).decode()
+                self.log.debug("free mem before start: %s", free_mem)
                 self.libvirt_domain.createWithFlags(
                     libvirt.VIR_DOMAIN_START_PAUSED)
+                free_mem = subprocess.check_output(["xl", "info", "free_memory"]).decode()
+                self.log.debug("free mem after start: %s", free_mem)
 
                 # the above allocates xid, lets announce that
                 self.fire_event('property-reset:xid', name='xid')
@@ -1239,6 +1243,10 @@ async def start(self, start_guid=True, notify_function=None,
                     exc = qubes.exc.QubesException(
                         'Failed to start an HVM qube with PCI devices assigned '
                         '- hardware does not support IOMMU/VT-d/AMD-Vi')
+                free_mem = subprocess.check_output(["xl", "info", "free_memory"]).decode()
+                self.log.debug("free mem after failed start: %s", free_mem)
+                subprocess.run(["xl", "list"])
+                subprocess.run(["xl", "info"])
                 self.log.error('Start failed: %s', str(exc))
                 await self.fire_event_async('domain-start-failed',
                                             reason=str(exc))