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

[Manoj Iyer]

I was able to apply this patch and build kexec-tools on Xenial. Please
see this link for details: https://pastebin.ubuntu.com/23950298/

[TESTING]

== Y kernel for X series with kexec support ==
I had to build a Yakkety kernel for Xenial series with KEXEC enabled.
ubuntu at test:~$ uname -a
Linux test 4.8.0-38-generic #40ubuntu1 SMP Tue Feb 7 21:26:52 UTC 2017 aarch64 aarch64 aarch64 GNU/Linux

== kexec-tools with patches to enable ARM64 support ==

ubuntu at test:~$ dpkg -l | grep kexec-tools
ii  kexec-tools                        1:2.0.10-1ubuntu2.1                arm64        tools to support fast kexec reboots
ubuntu at test:~$ 

== Load kexec kernel and initiate kexec ==
ubuntu at test:~$ sudo kexec -l /boot/vmlinuz-4.8.0-38-generic --initrd=/boot/initrd.img-4.8.0-38-generic --append="root=UUID=6ef62239-dad9-409b-a3ab-1847e44aa779 ro vt.handoff=7"
ubuntu at test:~$ sudo kexec -e

== Successful live boot of kexec kernel ==
Ubuntu 16.04.1 LTS test ttyAMA0

test login: [   85.371808] kexec_core: Starting new kernel
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.8.0-38-generic (manjo at tangerine) (gcc version 5.3.1 20160413 (Ubuntu/Linaro 5.3.1-14ubuntu2) ) #40ubuntu1 SMP Tue Feb 7 21:26:52 UTC 2017 (Ubuntu 4.8.0-38.40ubuntu1-generic 4.8.17)
[    0.000000] Boot CPU: AArch64 Processor [510f8000]
[    0.000000] efi: Getting EFI parameters from FDT:
[    0.000000] efi: EFI v2.50 by EDK II
[    0.000000] efi:  SMBIOS=0x5bdb0000  SMBIOS 3.0=0x58660000  PROP=0x5f714518  ACPI=0x58690000  ACPI 2.0=0x58690014
[    0.000000] No NUMA configuration found

** Patch added: "Xenial  kexec-tools arm64 support"
   https://bugs.launchpad.net/ubuntu/+source/kexec-tools/+bug/1659618/+attachment/4814982/+files/xenial-kexec-tools-enable-arm64-support.patch

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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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