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Date: Sat, 04 Nov 2006 11:19:53 -0800 From: Zachary Amsden <zach@...are.com> To: Chuck Ebbert <76306.1226@...puserve.com> Cc: Andi Kleen <ak@...e.de>, Andrew Morton <akpm@...l.org>, Linus Torvalds <torvalds@...l.org>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: [patch] i386: remove IOPL check on task switch Chuck Ebbert wrote: > In-Reply-To: <454B850C.3050402@...are.com> > > 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() > macro. > Who put a popfl back in switch_to? I took it out some time ago. It should not be there. The only reason for it was to stop IOPL leaking from one process to another from a sleep during a sysenter based system call. Zach - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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