Re: [patch] i386: remove IOPL check on task switch

Andi Kleen
2006-11-03T18:41:36Z

> Nack. This is used for paravirt-ops kernels that use IOPL'd userspace.
> Fixing it would require a fairly heavy penalty on the iret path, since
> every single instruction there contributes to a critical region which
> must have custom fixup code, or some other technique to provide
> protection against interrupt re-entrancy.
>
> At least, let's discuss other potential solutions first - for now it is
> harmless.

Ok I will drop the patch again

-Andi