Messages in this thread | | | Date | Fri, 3 Nov 2006 18:57:22 -0500 | From | Chuck Ebbert <> | Subject | Re: [patch] i386: remove IOPL check on task switch |
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In-Reply-To: <454B850C.3050402@vmware.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.
-- Chuck "Even supernovas have their duller moments." - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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