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Fedora – Configuration as Xen host (EFI preference)

I've installed a new Fedora box as a Xen host (Dom0), which turns out a little harder than expected.

First stop – install Xen via DNF and reboot. Find that the Xen boot option failed (a lot of errors regarding multiple boot). After some research on Google, I learn that it is because the multi-boot has been removed for security reasons.[1]

Ok – well it's annoying. Looks like I have two options [2]:

Reconfigure GRUB manually to use the old behavior of the string loader
Bypass GRUB and use Xen as an EFI boot loader

I'm leaving for option 2 because it seems to be a cleaner solution and does not require manipulating the shell script layers that have been built around GRUB these days to make it do what I want.

I arrived at creating an EFI boot option for Xen, but it seems like this option is ignored at startup. No error, no useful output. I do not know what to check next.

What I have up to here:

The EFI partition has EFI / xen with:

xen.efi (copy of EFI / fedora / xen-4.11.1.efi)
Copies of initramfs & vmlinuz from / boot
xen.cfg

xen.cfg text:

[global]



default = fedora

[fedora]
options =
kernel = vmlinuz root = / dev / nvme0n1p1 rhgb LANG = en_GB.UTF-8
ramdisk = initramfs.img

EFI option created with the help of:

efibootmgr -c -L Xen -d / dev / sdc -p 1 -l \ EFI \ xen \ xen.efi -c

The target state here is: The machine starts with Xen and a Fedora Dom0. What should I check or what should I try next?

[1] https://access.redhat.com/security/cve/cve-2015-5281

[2] https://wiki.xenproject.org/wiki/Xen_EFI

popup – Preference: info-tips or fixed information areas for point clouds?

I've seen two different ways to display information on a point of a point cloud

A tooltip (tooltip) that appears next to your cursor
When you hover over a point, the information appears in the same place, regardless of which point you clicked (at the bottom or side or on the graph).

There are advantages for both. I hoped to find best practices for these two ways of displaying information.

What do people usually prefer?

a true tooltip has the advantage of always being close to your point of view; your eyes do not need to travel far to access information.
On the other hand. I can see where it would be annoying to continually see the tooltip flashing day by day as you move between 300 and 400 different data points.