> > Execute "int $2" for NMI reinjection when FRED is enabled. > > This needs an explanation of _why_. And as requested earlier[*], please avoid > "reinjection" in this context. W/ FRED, we use ERETS to unblock NMI when returning from a NMI handler (Setting bit 28 of CS). And there are 2 approaches to do it: 1) "int $2", let the h/w do the job for us. 2) create a FRED stack frame, and then jump to fred_entrypoint_kernel in arch/x86/entry/entry_64_fred.S. I prefer "INT $2", what is your opinion? > [*] https://lore.kernel.org/all/Y20f8v9ObO+IPwU+@xxxxxxxxxx
