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

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Message-Id: <200611031941.28907.ak@suse.de>
Date:	Fri, 3 Nov 2006 19:41:28 +0100
From:	Andi Kleen <ak@...e.de>
To:	Zachary Amsden <zach@...are.com>
Cc:	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [patch] i386: remove IOPL check on task switch

 
> 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
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