Here are the 3 options for dealing with this I've come up with:

1) Disable ACPI in edk2 builds. That'd be an easy fix - but switching
away from upstream defaults isn't very future-proof. It also seems like
a pretty big regression risk for existing artful/bionic users who may be
depending on ACPI.

2) Switch the xenial cloud-images to use the HWE kernel. There's
precedent for this (we did it for trusty to add support for GICv3
systems). Existing VMs using 4.4 will still break after upgrading qemu-
efi past xenial.

3) Backport the necessary ACPI support to xenial's 4.4? That would fix
it everywhere, but I'm not sure how feasible/SRUable that would be.

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https://bugs.launchpad.net/bugs/1744754

Title:
  qemu-efi-aarch64 in >= artful can't boot xenial cloud images

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