[PATCH 0 of 3] Mem access improvements and new type

[Andres Lagar-Cavilla <andres@lagarcavilla.org>]

We improve the handling of hap faults when both type and access
restrictions are present.

We also add a new p2m access type, n2rwx. It allows for implement a "log
access" mode in the hypervisor, aking to log dirty but for all types of
accesses. Faults caused by this access mode automatically promote the
access rights of the ofending p2m entry, place the event in the ring, and
let the vcpu keep on executing.

Repost after feedback from Tim Deegan.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Signed-off-by: Adin Scannell <adin@scannell.ca>

 xen/arch/x86/hvm/hvm.c          |  14 +++++++++-----
 xen/arch/x86/hvm/hvm.c          |  20 +++++++++++++++-----
 xen/arch/x86/mm/p2m.c           |   8 +++++---
 xen/include/asm-x86/p2m.h       |   9 +++++----
 xen/arch/x86/hvm/hvm.c          |   1 +
 xen/arch/x86/mm/p2m-ept.c       |   1 +
 xen/arch/x86/mm/p2m.c           |  30 +++++++++++++++++++++---------
 xen/include/asm-x86/p2m.h       |   3 +++
 xen/include/public/hvm/hvm_op.h |   3 +++
 9 files changed, 63 insertions(+), 26 deletions(-)