[Bug 298532] Add support for ppc radix mmu minidump

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=298532

--- Comment #5 from commit-hook@FreeBSD.org ---
A commit in branch stable/14 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=bf1a46ffa8af5b1aa2a8ca244074f39d69023485

commit bf1a46ffa8af5b1aa2a8ca244074f39d69023485
Author:     Minsoo Choo <mchoo@FreeBSD.org>
AuthorDate: 2026-09-16 04:20:45 +0000
Commit:     Minsoo Choo <mchoo@FreeBSD.org>
CommitDate: 2026-10-12 04:00:21 +0000

    libkvm: support powerpc64 radix minidumps

    PowerPC64 radix minidumps use a 64KB root directory followed by three
    levels of 4KB page tables.  Add an MMU backend which walks those tables,
    handles large-page leaves, and decodes their always-big-endian entries
    on both powerpc64 and powerpc64le.

    Reject old radix minidumps whose pmap section is empty with a specific
    diagnostic.  Add a synthetic powerpc64le dump test which reads a page
    through both its kernel and direct-map addresses.

    PR:             298532
    Reviewed by:    jhb
    Approved by:    jhb (mentor)
    MFC after:      2 weeks
    Sponsored by:   FreeBSD Foundation
    Differential Revision:  https://reviews.freebsd.org/D59743

    (cherry picked from commit 592ede65bd48f16e5c46a016e92b732ed90094d2)

 lib/libkvm/Makefile                             |   3 +-
 lib/libkvm/kvm_minidump_powerpc64.c             |   2 +
 lib/libkvm/kvm_minidump_powerpc64_radix.c (new) | 270 ++++++++++++++++++++++++
 lib/libkvm/kvm_powerpc64.h                      |   2 +
 lib/libkvm/tests/kvm_open2_test.c               | 118 +++++++++++
 5 files changed, 394 insertions(+), 1 deletion(-)

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