Indeed! I've updated the bug status to reflect that. Currently I do have
a backport to 2.8 that seems to be working as well as latest upstream.
That is, I can save and restore a UEFI guest, prior to starting Linux.
I'm working on diagnosing an issue where a guest that has been saved
after Linux has booted fails to restore with:

Unexpected error in kvm_device_access() at 
/home/ubuntu/qemu/accel/kvm/kvm-all.c:2229:
2017-08-11T15:12:42.922614Z qemu-system-aarch64: KVM_SET_DEVICE_ATTR failed: 
Group 4 attr 0x0000000000000002: Invalid argument
2017-08-11 15:12:43.683+0000: shutting down, reason=crashed

** Changed in: qemu (Ubuntu Zesty)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: qemu (Ubuntu Zesty)
       Status: New => In Progress

** Changed in: qemu (Ubuntu)
     Assignee: (unassigned) => dann frazier (dannf)

** Changed in: qemu (Ubuntu)
       Status: New => In Progress

** Changed in: qemu (Ubuntu Xenial)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1710019

Title:
  support GICv3 ITS save/restore & migration

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