I’m told that Grub has been rebuilt and Shim has been re-signed with 7.4 so that might be the cause, but to me this is what a new VM looks like after being copied from the template disk:
For the googlers:
Failed to open \EFI\BOOT\grubx64.efi – Not Found
Failed to load image \EFI\BOOT\grubx64.efi: Not Found
start_image() returned Not Found
You might try to reinstall Grub2 and stuff but to me that didn’t work. I knew the OS is perfectly operable coz the Super Grub2 Disk boots it just fine. Just select
shim.efi and you have your VM up and running.
Then I stumbled upon
efibootmgr. To manually add an EFI entry to your system bootloader:
efibootmgr --create --label CentOS --disk /dev/sda1 --loader "\EFI\centos\shim.efi"
/dev/sda1 corresponds to
/boot/efi. You can check if the IDs match correctly with
efibootmgr --verbose. You should be able to see this new entry under your VM’s settings as well:
Why it worked automatically on anything prior to 7.4 is beyond me though.