Nested Paging Virtualization for KVM v4

Hi Avi, Marcelo,

as promised here is -v4 of my patch-set for virtualizing nested paging in KVM.
I addresses all of your review comments in this version and fixed a misbehavior
in the nested page-walker code where it would have reported the wrong
error-code on an emulated nested page fault.

Here is the complete list of changes:

	* Fixed the bug in the gpa_to_gfn function
	* Made sure that the right fault values are kept in the two-dimensional
	  page-table walker
	* Fixed the return code of x86_decode_insn so that a page-fault within
	  that function can be handled
	* Set vcpu->arch.mmu.direct_map to true for nonpaging mode too
	* Changed code so that the right access-mode is used on nested
	  page-table walks
	* Made the NX mode a capability of the MMU context to distinguish
	  between l1-nx and l2-nx (1 additional patch)
	* Fixed the bug that KVM always reports the SVM flag as supported to
	  userspace, it should only be reported on AMD hardware when nesting is
	  enabled

As the patch-set before this one was tested with the same set of combinations
too. I found no regressions to current avi/master. This patch-set applies on
current avi/master plus the three fixes I sent last week.

As with the last version of the patch-set I also pushed this one to a tree on
korg. Find it in

	git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-kvm.git npt-virt-v4

Please review these patches and/or apply them :-) As usual I appreciate your
feedback.

Thanks,

	Joerg


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