[PATCH v2 5/5] KVM: selftests: List the known IOMMU modes in irq_test's help output

[David Matlack <dmatlack@google.com>]

List the names of all known IOMMU modes in the help output for irq_test's
-t option, using iommu_mode_names() from the VFIO selftests library, and
clarify that the IOMMU mode is auto-detected by default.

The help output currently claims that the only valid modes are
vfio_type1_iommu and iommufd, which was never true, and would get stale
any time a mode is added to the VFIO selftests library.

Signed-off-by: David Matlack <dmatlack@google.com>
---
 tools/testing/selftests/kvm/irq_test.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/irq_test.c b/tools/testing/selftests/kvm/irq_test.c
index 8a345472df5f..ef69f9d7ac3d 100644
--- a/tools/testing/selftests/kvm/irq_test.c
+++ b/tools/testing/selftests/kvm/irq_test.c
@@ -159,7 +159,8 @@ static void help(const char *name)
 	printf("-i	The number of IRQs to generate during the test\n");
 	printf("-m	Pin target vCPU to random physical CPU before triggering interrupt\n");
 	printf("-n	Deliver 50 percent of IRQs as non-maskable interrupts\n");
-	printf("-t	Override the IOMMU type to use (vfio_type1_iommu or iommufd)\n");
+	printf("-t	Override the IOMMU mode to use instead of auto-detecting it (%s)\n",
+	       iommu_mode_names());
 	printf("-v	Number of vCPUS to run\n");
 	printf("-x	Use xAPIC mode instead of x2APIC mode in the guest\n");
 	printf("\n");
-- 
2.56.0.385.gac671c819a-goog