Re: [plex86] Performance enhancement: elminiating mode and contextswitches

[Ramon van Handel]

On Fri, 15 Dec 2000, James Mastros wrote:
> On Fri, Dec 15, 2000 at 12:23:08PM -0500, Kevin Lawton wrote:
> > Running guest ring0 code at ring0 open memory access to PTE.P==1 pages,
> > which includes the monitor interrupt handlers, and monitor data
> > structures.  Thus, all memory access instructions would be dangerous.
> Hm, would it be possible to run ring0 code on ring1?  I'm assuming all the
> memory we're trying to protect has a DPL of 0.

That would not solve the performance problem.  The optimisation is *based*
on the fact, that ring0 code can directly access monitor memory!

-- Ramon