Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [patch] i386: remove IOPL check on task switch | Date | Sat, 4 Nov 2006 21:02:12 +0100 |
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> Ok, checking shows Linus put it back to stop NT leakage.
It is also needed to stop AC leakage
> This is > correct, but unlikely. Would be nice to avoid it unless absolutely > necessary. Perhaps xor eflags old and new and only set_system_eflags() > if non-ALU bits have changed.
If it's worth it...
If it's worth for the context switch i think it would make more sense to do it for the normal restore_flags() etc. which are much more common (and could be actually handled in most cases with test + jump + sti)
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