Gleb Natapov wrote:
Could you elaborate on that? How/why does it use NMIs for task
switching?
During WHQL testing (or if you just enable verifier on windows 2003)
windows changes hibernate to not power down a PC, but resume
immediately. During this immediate resume it sends NMI to non-boot CPUs
while IDT for nmi is configured as a task gate. I am not sure it
actually calls IRET after that.
If it doesn't call IRET, it will never see another NMI.
But of course it will execute IRET, as part of normal execution. You
can't do anything without it.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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