A few months ago, Intel® simulation engineers working on Wind River* Simics* reported a bug in the Xen* hypervisor to the public email list. The bug was that Xen did not do the right thing when enabling Intel® Memory Protection Extensions (Intel® MPX). Xen used the feature inside virtual machines (VMs) even when it was not actually available to VMs, and thus failing. It was a small bug that was quickly patched, but it offered an interesting insight into the dynamics of software testing and the importance of testing with a wide variety of target machines.
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