diff --git a/tools/testing/selftests/kvm/irq_test.c b/tools/testing/selftests/kvm/irq_test.c
index fd03ec940362..bb20bb81e930 100644
--- a/tools/testing/selftests/kvm/irq_test.c
+++ b/tools/testing/selftests/kvm/irq_test.c
@@ -146,12 +146,13 @@ static const char *probe_iommu_type(void)
 
 static void help(const char *name)
 {
-	printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-e] [-h] [-t iommu_type]\n", name);
+	printf("Usage: %s [-a] [-d <segment:bus:device.function>] [-e] [-h] [-i nr_irqs] [-t iommu_type]\n", name);
 	printf("\n");
 	printf("Tests KVM interrupt routing and delivery via irqfd.\n");
 	printf("-a	Affine the device's host IRQ to a random physical CPU\n");
 	printf("-d	Use a VFIO device to send MSI-X interrupts instead of manually signaling the eventfd\n");
 	printf("-e	Set empty GSI routing in-between some interrupts\n");
+	printf("-i	The number of IRQs to generate during the test\n");
 	printf("-t	Override the IOMMU type to use (vfio_type1_iommu or iommufd)\n");
 	printf("\n");
 	exit(KSFT_FAIL);
@@ -186,7 +187,7 @@ int main(int argc, char **argv)
 	struct kvm_vm *vm;
 	int irq, irq_cpu;
 
-	while ((c = getopt(argc, argv, "ad:eht:")) != -1) {
+	while ((c = getopt(argc, argv, "ad:ehi:t:")) != -1) {
 		switch (c) {
 		case 'a':
 			irq_affinity = true;
@@ -197,6 +198,9 @@ int main(int argc, char **argv)
 		case 'e':
 			set_empty_routing = true;
 			break;
+		case 'i':
+			nr_irqs = atoi_positive("Number of IRQs", optarg);
+			break;
 		case 't':
 			iommu_type = optarg;
 			break;