I'm fine with the patch itself, but I don't have access to any of these
laptops - could you test any of these kernels and tell me if they fix
your boot issue?

http://people.canonical.com/~ppisati/lp1814982/

and here is the src code (for bionic):

https://git.launchpad.net/~p-pisati/ubuntu/+source/linux/log/?h=b
-master-lp1814982

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https://bugs.launchpad.net/bugs/1814982

Title:
  efi/arm/arm64: Allow SetVirtualAddressMap() to be omitted

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Bionic:
  Confirmed
Status in linux source package in Cosmic:
  Confirmed
Status in linux source package in Disco:
  Confirmed

Bug description:
  [Impact]
  The Ubuntu kernel is not currently bootable on various arm64 laptops (HP Envy 
x2, Asus NovaGo, Lenovo Miix 630, Lenovo Yoga C630, Samsung ...) because of EFI 
memory permissions/restrictions. The reason is explained in the commit supplied 
below. 

  [Test Case]
  Install and boot Ubuntu on one of the above arm64 laptops.

  [Fix]
  Committed upstream: 
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=4e46c2a956215482418d7b315749fb1b6c6bc224

  [Regression Risk]
  This commit adds support for an optional kernel command line parameter so 
there is minimal to no risk.

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