git: pmap: Implement pmap_npt_transform() for NVMM

[Aaron LI]

commit bb11cce638499f3152a08842a30640ee016c7b61
Author: Aaron LI <aly at aaronly.me>
Date:   Sun Jun 6 20:06:59 2021 +0800

    pmap: Implement pmap_npt_transform() for NVMM
    
    This function will transform an initialized pmap structure for use by
    NVMM's AMD SVM backend.
    
    AMD's NPT (nested page table), aka RVI (rapid virtualization indexing)
    implementation is more complete than Intel's EPT; it supports A/D bits
    and uses the same bits positions as native x86 page tables.  So this
    function is a simplified version of pmap_ept_transform().

Summary of changes:
 sys/platform/pc64/include/pmap.h |  1 +
 sys/platform/pc64/x86_64/pmap.c  | 36 ++++++++++++++++++++++++++++++++++++
 sys/vm/pmap.h                    |  1 +
 3 files changed, 38 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/bb11cce638499f3152a08842a30640ee016c7b61


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