git: pmap: Implement pmap_ept_transform() for NVMM

[Aaron LI]

commit 297019886e36c44b41a02c510e06e635ce29f43e
Author: Aaron LI <aly at aaronly.me>
Date:   Sun Jun 6 11:30:13 2021 +0800

    pmap: Implement pmap_ept_transform() for NVMM
    
    The pmap_ept_transform() transforms an initialized pmap structure to be
    EPT type for Intel VMX hypervisor (e.g., NVMM) use.  This implementation
    is derived from vmx_ept_init() and vmx_ept_pmap_pinit() in
    'pc64/vmm/ept.c'.
    
    Note that this function has a different prototype as NetBSD's one,
    because we don't make 'pmap_ept_has_ad' a global variable so we need to
    pass extra flags to the pmap.
    
    When zeroing out the page directories, note that the valid area is two
    pages if there is a pm_pmlpv_iso PTE installed (i.e., the system has
    meltdown mitigation enabled), otherwise, it's only one page.  (credit to
    Matt Dillon)

Summary of changes:
 sys/platform/pc64/x86_64/pmap.c | 67 +++++++++++++++++++++++++++++++++++++++++
 sys/vm/pmap.h                   |  1 +
 2 files changed, 68 insertions(+)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/297019886e36c44b41a02c510e06e635ce29f43e


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