Comment 8 for bug 1519836

The suggested patch from comment #5 has been merged in the 2.02 beta3 code.

We've built grub2 from sources and used the compiled grubx64.efi in MAAS 1.9 to attempt to boot a Gen2 VM.

However, the boot process failed to load the kernel and perform a PXE boot, exactly because of the timer not allowing for the transfers to occur.
So from our tests this patch doesn't resolve the problem.

The original patch mentioned has been used numerous times with Ubuntu, as we even have a wiki article published at http://wiki.cloudbase.it/hyperv-uefi-grub as a reference for MAAS deployments if Generation 2 VMs are to be used.