[Bug 1659618] Re: Enable ARM64 support in kexec-tools

[Manoj Iyer]

[Regression testing on Xenial AMD64]
AMD64 kernel already has kexec support on Xenial. The attached patch applies cleanly and builds on AMD64: https://pastebin.ubuntu.com/23950437/

== Installed kexec-tools built with ARM64 enablement patches ==
ubuntu at test:~$ dpkg -l | grep kexec-tools
ii  kexec-tools                      1:2.0.10-1ubuntu2.1                amd64        tools to support fast kexec reboots
ubuntu at test:~$ 

== Load kexec kernel and initiate kexec ==
ubuntu at test:~$ sudo kexec -l /boot/vmlinuz-4.4.0-62-generic --initrd=/boot/initrd.img-4.4.0-62-generic --append="root=LABEL=cloudimg-rootfs ro console=ttyS0"
ubuntu at test:~$ sudo kexec -e

== Successfully live booted kernel ==
Ubuntu 16.04.1 LTS test ttyS0

test login: [   18.860792] kexec_core: Starting new kernel
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Linux version 4.4.0-62-generic (buildd at lcy01-30) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) ) #83-Ubuntu SMP Wed Jan 18 14:10:15 UTC 2017 (Ubuntu 4.4.0-62.83-generic 4.4.40)
[    0.000000] Command line: root=LABEL=cloudimg-rootfs ro console=ttyS0
[    0.000000] KERNEL supported cpus:
[    0.000000]   Intel GenuineIntel
[    0.000000]   AMD AuthenticAMD
[    0.000000]   Centaur CentaurHauls
[    0.000000] x86/fpu: Legacy x87 FPU detected.
[    0.000000] x86/fpu: Using 'lazy' FPU context switches.
[    0.000000] e820: BIOS-provided physical RAM map:

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https://bugs.launchpad.net/bugs/1659618

Title:
  Enable ARM64 support in kexec-tools

Status in kexec-tools package in Ubuntu:
  Fix Released
Status in kexec-tools source package in Xenial:
  In Progress
Status in kexec-tools source package in Yakkety:
  In Progress
Status in kexec-tools package in Debian:
  Fix Released

Bug description:
  [IMPACT]
   * kexec-tools in Xenial (16.04) currently does not support ARM64
     architecture.
   * Backport support for ARM64 arch from upstream
     https://github.com/horms/kexec-tools
   * Majority of the patches are contained in kexec/arch/arm64/ except for
     one patch that impacts purgatory and common device tree routines.

  [TEST CASE]
   * I built kexec-tools for ARM64 and tested it on HW using the following
     testcase:
     $ sudo kexec -l /boot/vmlinuz-<version>-generic
       --initrd=/boot/initrd.img-<version>-generic
       --command-line="root=UUID=<uuid> ro vt.handoff=7"
     $ sudo kexec -e
   * I was able to kexec the new kernel successfully.
   * [ 6702.357899] kexec_core: Starting new kernel
     [    0.000000] Booting Linux on physical CPU 0x200
     [    0.000000] Linux version <version>-generic (buildd at bos01-arm64-008)
     (gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) )
     [    0.000000] Boot CPU: AArch64 Processor [510f8000]

  [REGRESSION POTENTIAL]
   * Since patches are confined to arm[64] there is a low overall risk of
     regression.

  [OTHER INFO]
   * You can find a Xenial kexec-tools package built for AMD64, i386 and
     ARM64 in my PPA
     https://launchpad.net/~manjo/+archive/ubuntu/kexec-tools
   * This package is built using the Xenial source package for kexec-tools
     with ARM64 enablement patches applied.
   * Please pull the changes from my PPA package and integrate into Ubuntu
     Xenial kexec-tools after review.

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