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mode. - Make the NMI handler run on its own stack (TSS_IST2). - Store the GSBASE value for each CPU just before the start of each NMI stack, permitting efficient retrieval using %rsp-relative addressing. - For NMIs taken from kernel mode, program MSR_GSBASE explicitly since one or both of MSR_GSBASE and MSR_KGSBASE can be potentially invalid. The current contents of MSR_GSBASE are saved and restored at exit. - For NMIs handled from user mode, continue to use 'swapgs' to load the per-CPU GSBASE. Reviewed by: jeff Debugging help: jeff Tested by: gnn, Artem Belevich <artemb at gmail dot com> |
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