git: libnvmm: Improve the correctness of page table walks

[Aaron LI]

commit 6f52ef555fbe1c6d723cc36b34d2eb8ed08f45c9
Author: Aaron LI <aly at aaronly.me>
Date:   Sat Oct 3 18:46:32 2026 +0800

    libnvmm: Improve the correctness of page table walks
    
    * Fix 32bit PAE: the top-level pdir doesn't have NX.
    * Fix 32bit non-PAE: PTE_PS is ignored if CR4.PSE=0.
    * Stop the walks early on if a required permission is not met.
    * Take CR0.WP and EFER.NXE into account when evaluating permissions.
    * Enforce SMEP/SMAP protections.
    * Document the semantics of nvmm_gva_to_gpa() more clearly.
    * Add unit-tests.
    
    Note that the '64bit walk - present' test is failing, which will be
    fixed in a later commit.
    
    Obtained-from: NVMM Reference Implementation

Summary of changes:
 lib/libnvmm/libnvmm.3                 |  14 ++-
 lib/libnvmm/libnvmm_x86.c             | 230 ++++++++++++++++++++--------------
 test/testcases/libnvmm/h_mem_assist.c | 125 +++++++++++++++++-
 test/testcases/libnvmm/h_os.h         |   3 +
 4 files changed, 271 insertions(+), 101 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/6f52ef555fbe1c6d723cc36b34d2eb8ed08f45c9


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