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Date:	Fri, 3 Nov 2006 18:57:22 -0500
From:	Chuck Ebbert <>
To:	Zachary Amsden <>
Cc:	Andi Kleen <>, Andrew Morton <>,
	Linus Torvalds <>,
	linux-kernel <>
Subject: Re: [patch] i386: remove IOPL check on task switch

In-Reply-To: <>

On Fri, 03 Nov 2006 10:06:04 -0800, Zachary Amsden wrote:

> Chuck Ebbert wrote:
> > IOPL is implicitly saved and restored on task switch,
> > so explicit check is no longer needed.
> Nack.  This is used for paravirt-ops kernels that use IOPL'd userspace.  

How does that work?  In the stock kernel, anything done by
the call to set_iopl_mask() (that was removed by the patch)
will be nullified by the 'popfl' at the end of the switch_to()

"Even supernovas have their duller moments."
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