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Hardening the Operating Systems against transient faults

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Hardening the Operating Systems against transient faults
Subtitle
Dealing with external interrupts
Alternative Title
Operating System hardening : Dealing with external interrupts
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561
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CC Attribution 2.0 Belgium:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Abstract
We are modifying the Nova hypervisor to protect the operating system it hosts, against frequent transient faults resulting from cosmic radiations or manufacturing defects in the CPU. The method relies on the CPU internal exceptions management mechanisms, redundancy of execution and the machine check architecture. Here we will present how to deal with external interrupts, that is one of the challenges faced when it comes to execute short sequences of operating system's instructions twice. Ton erst ab Minute 3!