diff --git a/repos/base-nova/ports/nova.hash b/repos/base-nova/ports/nova.hash
index 0b7d4a6e7f..9bae98c7d4 100644
--- a/repos/base-nova/ports/nova.hash
+++ b/repos/base-nova/ports/nova.hash
@@ -1 +1 @@
-f5e2aa3d82dd6737422987241ebc8e17ecbf640c
+7208e091c7694c61247427715d0abef7ba8d78e3
diff --git a/repos/base-nova/ports/nova.port b/repos/base-nova/ports/nova.port
index 388df664db..7ef5b271c8 100644
--- a/repos/base-nova/ports/nova.port
+++ b/repos/base-nova/ports/nova.port
@@ -4,7 +4,7 @@ DOWNLOADS := nova.git
 
 # r10 branch
 URL(nova) := https://github.com/alex-ab/NOVA.git
-REV(nova) := de90690dbf395a786d10c22123f37feb143a109f
+REV(nova) := 1c6acf0af8256036cdea023576e2cb0e30e7d69c
 DIR(nova) := src/kernel/nova
 
 PATCHES   := $(sort $(wildcard $(REP_DIR)/patches/*.patch))
diff --git a/repos/base-nova/src/core/irq_session_component.cc b/repos/base-nova/src/core/irq_session_component.cc
index e59e462282..472d885ce1 100644
--- a/repos/base-nova/src/core/irq_session_component.cc
+++ b/repos/base-nova/src/core/irq_session_component.cc
@@ -107,6 +107,11 @@ void Irq_object::sigh(Signal_context_capability cap)
 	if (!_sigh_cap.valid() && !cap.valid())
 		return;
 
+	if (_sigh_cap.valid() && _sigh_cap == cap) {
+		/* avoid useless overhead, e.g. with IOMMUs enabled */
+		return;
+	}
+
 	if ((_sigh_cap.valid() && !cap.valid())) {
 		deassociate(irq_sel());
 		_sigh_cap = Signal_context_capability();