Re: [patch] SMP alternatives

From: Andi Kleen
Date: Wed Nov 23 2005 - 17:32:44 EST

> Well, with VTX or Pacifica virtualization is in ring 3. The fact that

Not it's not. The whole point is that there is no "ring compression"
The guest has all its normal rings, just the hypervisor has additional
"negative" rings.

In the current Xen x86-64 para virtualization setup the guest kernel
is in ring 3, but I hope VT/P. will do away with that because it
causes lots of issues.

> What you really want is one bit for kernel mode (cpl 0-2) and one for
> user mode (cpl 3).


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