Re: [v2 0/5] arm64: allow to reserve memory for normal kexec kernel

The crashkernel reservation for kdump is a must, there are already a lot
of different problems need to consider, for example the low and high
memory issues, and a lot of other things.  I'm not convinced to enable
this for kexec reboot.

This really looks to workaround the arm64 issue and move the
complication to kernel.

I will be working on MMU arm64 kernel relocation solution.

Pasha

quoted

On, the other hand hibernate does something similar already, but there
MMU never needs to be disabled, and also by the time machine_kexec()
is called, allocator is not available, as we can't fail to do reboot,
so page table must be pre-allocated during kernel load time.

Note: the above time is relocation time only. Purgatory usually also
computes checksum, but that is skipped, because --no-check is used when
kernel image is loaded via kexec.

Pavel Tatashin (5):
  kexec: quiet down kexec reboot
  kexec: add resource for normal kexec region
  kexec: export common crashkernel/kexeckernel parser
  kexec: use reserved memory for normal kexec reboot
  arm64, kexec: reserve kexeckernel region

 .../admin-guide/kernel-parameters.txt         |  7 ++
 arch/arm64/kernel/setup.c                     |  5 ++
 arch/arm64/mm/init.c                          | 83 ++++++++++++-------
 include/linux/crash_core.h                    |  6 ++
 include/linux/ioport.h                        |  1 +
 include/linux/kexec.h                         |  6 +-
 kernel/crash_core.c                           | 27 +++---
 kernel/kexec_core.c                           | 50 +++++++----
 8 files changed, 127 insertions(+), 58 deletions(-)

--
2.22.0


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Thanks
Dave