Re: [Xen-users] EFI boot unsuccessful with Ubuntu 18.04 dom0

[PGNet Dev <pgnet.dev@xxxxxxxxx>]

> So... how do you get grub to load the xen hypervisor?

Not entirely clear what you're asking ...

If you've multiple boot options, grub needs to be told which config to load -- 
either selected at the menu manaully, or set as its default selection.

Verify all your menuentry,

        grep -i menuentry /boot/grub2/grub.cfg
                ...

and that the right one's selected,

        grep saved_entry /boot/grub2/grubenv
                
saved_entry=xen-gnulinux-simple-4c0d851f-c586-1a2a-4976-488765f65863

&/or set manually with

        grub2-set-default

The grub (re)install process should populate the bootloader

        /boot/efi/EFI/opensuse/grubx64.efi
        file /boot/efi/EFI/opensuse/grubx64.efi
                /boot/efi/EFI/opensuse/grubx64.efi: PE32+ executable (EFI 
application) x86-64 (stripped to external PDB), for MS Windows

The efi env is pointed to the correct bootloader, e.g. after a kernel update, 
with the following command

        efibootmgr --create --quiet \
         --disk /dev/sde \
         --part 2 \
         --loader '\EFI\opensuse\grubx64.efi' \
         --label "suse-xen"

where,

        mount | grep /boot/efi | grep vfat
                /dev/sde2 on /boot/efi type vfat 
(rw,relatime,fmask=0002,dmask=0002,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro,x-systemd.automount)

Note also

        cat efi/startup.nsh
                fs0:\EFI\opensuse\grubx64.efi

        where, fs0: <=== the efi partition mount,


The script execs automatically when the EFI shell environment is opened, and 
loads the 'grubx64.efi',
The use of the startup.nsh was (is still?) a holdover necessary to resolve 
prior/recurring problems with the wonky efi loader. Simply -- for me -- it 
ensures that the script -- and therefore grub->xen -- loads, instead of 
dropping me to the EFI prompt.




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