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Make it possible to assert that a given MSI eventfd did _not_ fire by adding a helper to mark an eventfd non-blocking. Demonstrate this in vfio_pci_device_test by asserting the MSI eventfd did not fire before vfio_pci_irq_trigger(). Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: David Matlack <dmatlack@google.com> Link: https://lore.kernel.org/r/20250822212518.4156428-11-dmatlack@google.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com>