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The realtime preemption mini-summitThe realtime preemption mini-summitPosted Oct 4, 2009 13:51 UTC (Sun) by dvhart (guest, #19636)In reply to: The realtime preemption mini-summit by nix Parent article: The realtime preemption mini-summit
There are other less known uses for SMIs that are an unfortunately reality of our world. Fixing hardware bugs is one. A buggy instruction for instance can get emulated under an SMI. It would be wonderful if those things never existed, but in practice, that just isn't the case.
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The realtime preemption mini-summit Posted Oct 5, 2009 19:10 UTC (Mon) by bdonlan (guest, #51264) [Link]
Buggy instructions can also be fixed in the kernel, however, and at least then you know about them. While this may be a bit unfeasable for Windows, there should be some kind of switch Linux can use to disable the SMI handling, and just pass things to the normal #UD handler. If you then include hooks for any operations needing emulation at the same time as loading new microcode to disable the hardware support, no problem.
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