FITH (Fault Injection Test Harness) is a tool for validating driver robustness. Without changing existing code, it can intercept arbitrary MMIO/PIO access and IRQ handler in driver.

Firstly I'll first list the requirements and design for Fault Injection. Next, we discuss a couple of new generally useful implementation in FITH

1. KMMIO - the ability to dynamically hook into arbitrary MMIO operations.
2. KIRQ - the ability to hook into an arbitrary IRQ handler,

Then I'll demonstrate how the FITH can help developers to trace and identify tricky issues in their driver. Performance benchmark is also provided to show our efforts in minimizing the impact to system performance. At last, I'll elaborate on current and future efforts and conclude.

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