** Tags added: qdf2400

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https://bugs.launchpad.net/bugs/1694859

Title:
  arm64 kernel crashdump support

Status in kexec-tools package in Ubuntu:
  Fix Released
Status in linux package in Ubuntu:
  In Progress
Status in makedumpfile package in Ubuntu:
  Confirmed
Status in kexec-tools source package in Xenial:
  Confirmed
Status in linux source package in Xenial:
  Won't Fix
Status in makedumpfile source package in Xenial:
  Confirmed
Status in kexec-tools source package in Yakkety:
  Confirmed
Status in linux source package in Yakkety:
  Won't Fix
Status in makedumpfile source package in Yakkety:
  Confirmed
Status in kexec-tools source package in Zesty:
  In Progress
Status in linux source package in Zesty:
  Fix Committed
Status in makedumpfile source package in Zesty:
  Confirmed

Bug description:
  Note: Updates are being staged at ppa:dannf/arm64-kdump.

  [Impact]
  It is not possible to collect a kernel crash dump from a crashed arm64 server 
for later debugging.

  [Test Case]
  sudo apt install kdump-tools
  (reboot, so crashkernel= is added to the kernel commandline)
  echo c | sudo tee /proc/sysrq-trigger

  Crash dump should occur, with artifacts collected in /var/crash.

  If you want to verify that the dump is usable, install the
  corresponding linux-image-<ver>-dbgsym package and run:

  sudo crash /usr/lib/debug/boot/vmlinux-<ver>
  /var/crash/<crash>/dump.<crash>

  crash should successfully load, placing you at a "crash>" prompt. At
  that prompt, you can issue the 'bt' command to see a backtrace.

  [Regression Risk]
  3 patches here touch code outside of arch/arm64/:

  memblock: add memblock_clear_nomap()
  This adds a new function with no callers, so regression risk is negligible.
  (A later patch adds a call to it under arch/arm64/).

  memblock: add memblock_cap_memory_range()
  This refactors some of the code in memblock_mem_limit_remove_map() into a new 
function. The only existing caller of memblock_mem_limit_remove_map() is under 
arch/arm64/, so the regression risk outside of arm64 is negligible.

  efi/libstub/arm*: Set default address and size cells values for an empty dtb
  Because this code is for EFI platforms that support device-tree, it is 
de-facto ARM-specific (as noted in the patch title).

  For arm64, we have mitigated the risk by explicit regression testing on 
several platforms:
   - Qualcomm QDF2400
   - Cavium ThunderX CRB1S
   - HP m400 (X-Gene)
   - HiSilicon D05 (Hi07)

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