[PATCH v2 4/4] vfio: selftests: Extend timeout for runner executions

[Alex Williamson <alex.williamson@nvidia.com>]

When executed via the runner, ie. run_kselftest.sh, tests are subject
to a default 45s timeout.  None of the igb, ioatdma, or nv_falcon
drivers can run the vfio_pci_driver_test within this window.

The igb driver is the worst due to the device getting wedged from bad
DMAs in mix_and_match and requiring the full transaction pending
delay prior to FLR.

This is even further exacerbated when the system implements
firmware-first error handling and the transaction pending scheduled
delays are preempted beyond expectations by SMIs.

Worst case observed runtime for the whole vfio_pci_driver_test on
such a setup is 450s.  Round up to 600s.

Assisted-by: LLM
Reviewed-by: David Matlack <dmatlack@google.com>
Signed-off-by: Alex Williamson <alex.williamson@nvidia.com>
---
 tools/testing/selftests/vfio/.gitignore | 1 +
 tools/testing/selftests/vfio/settings   | 5 +++++
 2 files changed, 6 insertions(+)
 create mode 100644 tools/testing/selftests/vfio/settings

diff --git a/tools/testing/selftests/vfio/.gitignore b/tools/testing/selftests/vfio/.gitignore
index 7fadc19d3bca..fc14bc18bcd8 100644
--- a/tools/testing/selftests/vfio/.gitignore
+++ b/tools/testing/selftests/vfio/.gitignore
@@ -8,3 +8,4 @@
 !*.mk
 !.gitignore
 !Makefile
+!settings
diff --git a/tools/testing/selftests/vfio/settings b/tools/testing/selftests/vfio/settings
new file mode 100644
index 000000000000..c9abf1c19f19
--- /dev/null
+++ b/tools/testing/selftests/vfio/settings
@@ -0,0 +1,5 @@
+# Extend kselftest default 45s timeout based on worst case test runtime,
+# currently vfio:vfio_pci_driver_test running on physical NIC, battling
+# SMIs due to invoked firmware-first error handling from bad DMAs and
+# device wedging.  Observed worst case ~450s, extend to 600s.
+timeout=600
-- 
2.53.0