[PATCH v7 13/20] KVM: selftests: Make number of IRQs configurable in IRQ test

[Sean Christopherson <seanjc@google.com>]

From: David Matlack <dmatlack@google.com>

Extend the eventfd IRQ test with a '-i' flag to let the user specify the
the number of IRQs to generate (instead of hardcoding the test to always
generate 1000 interrupts).

Signed-off-by: David Matlack <dmatlack@google.com>
Co-developed-by: Josh Hilke <jrhilke@google.com>
Signed-off-by: Josh Hilke <jrhilke@google.com>
[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 tools/testing/selftests/kvm/irq_test.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/irq_test.c b/tools/testing/selftests/kvm/irq_test.c
index 2356912e2272..2cfb6c24e8d6 100644
--- a/tools/testing/selftests/kvm/irq_test.c
+++ b/tools/testing/selftests/kvm/irq_test.c
@@ -134,12 +134,13 @@ 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);
@@ -174,7 +175,7 @@ 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;
@@ -185,6 +186,9 @@ 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;
-- 
2.54.0.1136.gdb2ca164c4-goog