This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
cosmic' to 'verification-done-cosmic'. If the problem still exists,
change the tag 'verification-needed-cosmic' to 'verification-failed-

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

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** Tags added: verification-needed-cosmic

** Tags added: verification-needed-bionic

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  armhf guests fail to boot in EFI mode

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Bionic:
  Fix Committed
Status in linux source package in Cosmic:
  Fix Committed
Status in linux source package in Disco:
  Fix Released

Bug description:
  The fix for bug 1786878 introduced a regression that causes armhf guest 
booted in EFI mode to panic.

  [Test Case]
  Boot an armhf guest in EFI mode. Here's how I do that on an arm64 box that 
supports AArch32:

  sudo qemu-system-aarch64 -enable-kvm -M virt,gic_version=host -smp 7
  -m 2048 -cpu host,aarch64=off -nographic -pflash AAVMF32_CODE.fd
  -pflash AAVMF32_VARS.fd -drive if=none,file=bionic-server-cloudimg-
  armhf.img,id=hd0 -device virtio-blk-device,drive=hd0 -drive
  if=none,file=my-seed.img,id=hd1      -device virtio-blk-
  device,drive=hd1 -drive if=none,file=debian.img,id=hd3 -device virtio-
  blk-device,drive=hd3     -netdev type=tap,id=net0      -device virtio-

  33412b8673135 efi/arm: Revert deferred unmap of early memmap mapping

  [Regression Risk]
  This change is specific to efi/arm, which currently doesn't boot. The 
reverted change was to allow for ACPI BGRT code, which isn't supported on 
32-bit ARM.

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