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

[Manoj Iyer]

The attached patch has the complete set of patches needed for kexec support on ARM64. 
* Enable ARM64 support in kexec-tools (LP: #1659618)
* Enable support for compressed kernels on ARM64 (LP: #1661363)
* kexec: Increase the upper limit for RAM segments (LP: #1663400)

This patch applies cleanly on Yakkety kexec-tools:
https://pastebin.ubuntu.com/23968404/

Testing for lp 1663400 is posted to the SRU request description. Testing
results for arm64 support yielded the same results as previously.

ubuntu at yk:/tmp$ dpkg -l | grep kexec-tools
ii  kexec-tools                                1:2.0.10-2ubuntu1.1                              arm64        tools to support fast kexec reboots
ubuntu at yk:/tmp$

ubuntu at yk:/tmp$ sudo kexec -l /boot/vmlinuz-4.8.0-38-generic --initrd=/boot/initrd.img-4.8.0-38-generic --append="root=UUID=d80e6bcf-a747-43fd-97fe-e47574637b2b ro  vt.handoff=7"
ubuntu at yk:/tmp$

ubuntu at yk:/tmp$ sudo kexec -e
Ubuntu 16.10 yk ttyAMA0

yk login: [ 1902.177836] 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 6.2.0 20161005 (Ubuntu 6.2.0-5ubuntu12) ) #40ubuntu1 SMP Mon Feb 6 21:55:35 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: "[YAKKETY Final] kexec arm64 support patch"
   https://bugs.launchpad.net/ubuntu/+source/kexec-tools/+bug/1659618/+attachment/4816757/+files/final-kexec-yakkety-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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