[PATCH v5 0/3] Add restrictions for kexec/kdump jumping between 5-level and 4-level kernel

[Baoquan He]

The v4 cover letter tells the background about this adding, paste the
link here for reference:
http://lkml.kernel.org/r/20190509013644.1246-1-bhe@xxxxxxxxxx

Changelog:
v4->v5:
  Tune code and log per Dave's comments, no functional change.
  - In patch 2, change the printed erorr message; 
  - In patch 3, add macro SZ_64T and use it in code, and remove the
    obsolete code comment.
v3->v4:
  No functional change.
  - Rewrite log of patch 1/3 tell who the newly added bits are gonna be
    used.
  - Rewrite log of patch 2/3 per tglx's words.
  - Add Kirill's Acked-by.

v2->v3:
  Change the constant to match the notation for the rest of defines as
  Kirill suggested;
v1->v2:
  Correct the subject of patch 1 according to tglx's comment;
  Add more information to cover-letter to address reviewers' concerns;

Baoquan He (3):
  x86/boot: Add xloadflags bits for 5-level kernel checking
  x86/kexec/64: Error out if try to jump to old 4-level kernel from
    5-level kernel
  x86/kdump/64: Change the upper limit of crashkernel reservation

 arch/x86/boot/header.S                | 12 +++++++++++-
 arch/x86/include/uapi/asm/bootparam.h |  2 ++
 arch/x86/kernel/kexec-bzimage64.c     |  5 +++++
 arch/x86/kernel/setup.c               | 15 ++++++++++++---
 include/linux/sizes.h                 |  1 +
 5 files changed, 31 insertions(+), 4 deletions(-)

-- 
2.17.2