[Bug 1851190] Re: Ubuntu 18.04: kexec-tool shows "kexec: elfcorehdr doesn't fit cells-size" if crashkernel reserved beyond 4GB

[Prabhakar Kushwaha]

I verified using SLE-15-SP2-RC1. I can see it has updated grub version i.e. GNU GRUB  version 2.04. 
With this i am not seeing any error. Please see below, crash kernel has been allocated beyond 4G system memory and I am not seeing any error during kexec -p 

localhost:~ # dmesg | grep crash
[    0.000000] crashkernel reserved: 0x0000000b81200000 - 0x0000000c81200000 (4096 MB)
[    0.000000] Kernel command line: BOOT_IMAGE=/boot/Image-5.3.18-10-default root=UUID=577239a9-5a1b-49a6-b3c1-67fc1ce83368 console=ttyAMA0 ip=dhcp isofrom_device=nfs:10.112.36.118:/opt/shared/isos/suse/SLE-15-SP2 isofrom_system=/SLE-15-SP2-Full-aarch64-RC1-Media1.iso mitigations=auto crashkernel=4G at 0xb81200000 nowatchdog


localhost:~ # kexec -v
kexec-tools 2.0.20
localhost:~ # 
localhost:~ # kexec -p -i /boot/Image-`uname -r` --initrd=/boot/initrd-`uname -r`
localhost:~ #

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https://bugs.launchpad.net/bugs/1851190

Title:
  Ubuntu 18.04: kexec-tool shows "kexec: elfcorehdr doesn't fit cells-
  size" if crashkernel reserved beyond 4GB

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2-signed package in Ubuntu:
  Fix Released
Status in grub2 source package in Bionic:
  Fix Released
Status in grub2-signed source package in Bionic:
  Fix Released
Status in grub2 source package in Disco:
  Fix Released
Status in grub2-signed source package in Disco:
  Fix Released
Status in grub2 source package in Eoan:
  Fix Released
Status in grub2-signed source package in Eoan:
  Fix Released
Status in grub2 source package in Focal:
  Fix Released
Status in grub2-signed source package in Focal:
  Fix Released

Bug description:
  [Impact]
  On arm64, kexec throws following errors if crashkernel is reserved beyond 4GB of system memory.

  [Test Case]
  Create an arm64 guest w/ say 6GiB of memory.
  Add crashkernel=1G at 4G to kernel boot args

  $ kexec -p /boot/vmlinuz-`uname -r` --initrd=/boot/initrd.img-`uname
  -r` --reuse-cmdline
  $ kexec: elfcorehdr doesn't fit cells-size.
  $ kexec: setup_2nd_dtb failed.
  $ kexec: load failed.
  $ Cannot load /boot/vmlinuz-5.4.0-rc4+

  [Fix]
  Backport the following upstream commits:
  347210a5d efi/fdt: Set address/size cells to 2 for empty tree
  e93fd6b77 fdt: Move prop_entry_size to fdt.h

  [Regression Risk]
  Changes are restricted to efi/fdt code in GRUB, so regressions would be most likely on ARM platforms, specifically those that boot using ACPI (mostly servers).

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