[Xen-devel] Fedora 30 and BLSCFG changes equals non-booting DomUs.

[Steven Haigh <netwiz@xxxxxxxxx>]

Fedora 30 implemented Boot Loader Specification (BLS) by default for 
all newly installed, and any upgraded systems.
This causes hell booting a DomU that is *not* configured as HVM - thus 
fails when not using the bootloader from within the guest.
pygrub will always fail to boot these VMs.

Links:

Fedora change page:
        https://fedoraproject.org/wiki/Changes/BootLoaderSpecByDefault

Main Fedora BZ with lots of issues:
        https://bugzilla.redhat.com/show_bug.cgi?id=1652806

My bug report on new kernels not appearing in generated grub.cfg files:
        https://bugzilla.redhat.com/show_bug.cgi?id=1703700

So far, the only workaround is to install the 'grubby-depreciated' 
package, set 'GRUB_ENABLE_BLSCFG=false' in /etc/default/grub, then 
manually re-create the grub.cfg file via: grub2-mkconfig -o 
/boot/grub/grub.cfg
Upon a newer kernel being installed, it may or may not appear in the 
grub.cfg configuration - even with the above changes. As such, numerous 
kernel upgrades later and your installed VM might not boot at all.
In numerous systems, I run grub2-mkconfig in /etc/rc.d/rc.local to 
avoid a completely broken VM. Not ideal.
So, to start the discussion, with none of this currently being sent 
upstream, this is a Fedora-ism. How to handle BLS enabled guests?
It also seems to be a Fedora problem with respect to kernel updates 
still causing problems - but that's another issue.
Steven Haigh

📧 netwiz@xxxxxxxxx     💻 https://www.crc.id.au
📞 +613 9001 6090       📱 +614 1293 5897




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