Chuck Ebbert wrote:
In-Reply-To: <[email protected]>
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
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