[CentOS] Xen hypervisor on CentOS 7.4 with modern UEFI server not booting from grub

Why do you need UEFI? It does not add to security "a lot" but was designed to block booting software like a "hypervisor". I used my Dell notebooks to test our hypervisor identification software (HyperCatcher if you are interested) which is bootable image. However, I was unable to boot it until I disabled UEFI. As I understand it, it will block anything from booting excepting original OS. Your Xen and our HyperCatcher are outsiders for UEFI.


Mikhail Utin


________________________________
From: CentOS <centos-bounces at centos.org> on behalf of John Naggets <hostingnuggets at gmail.com>
Sent: Tuesday, January 30, 2018 17:23
To: centos at centos.org
Subject: [CentOS] Xen hypervisor on CentOS 7.4 with modern UEFI server not booting from grub

Hi,

I installed CentOS 7.4 on a modern Lenovo ThinkSystem SR630 server
which uses UEFI. So far so good CentOS 7.4 works fine so then I went
on to install the Xen hypervisor by following the instructions from
the wiki (https://wiki.centos.org/HowTos/Xen/Xen4QuickStart).
HowTos/Xen/Xen4QuickStart - CentOS Wiki<https://wiki.centos.org/HowTos/Xen/Xen4QuickStart>
wiki.centos.org
Scope. This guide will help you get from a baseline CentOS/x86_64 install to running the complete Xen-4 stack in just under 10 minutes, this includes getting your ...




Unfortunately when I reboot after having installed the xen package the
system does not boot into "CentOS Linux, with Xen hypervisor" from the
grub menu prompt. I get the following error:

Loading Xen 4.6.6-8.el7 ...
error: can't find command `multiboot'.
Loading Linux 4.9.75-29.el7.x86_64 ...
error: can't find command `module'.
Loading initial ramdisk ...
error: can't find command `module'.

Press any key to continue...

The problem which I encounter here is exactly the same issue as
described for Fedora in the RedHat bugs:
https://bugzilla.redhat.com/show_bug.cgi?id=1286317 with the exception
With 4.5.2 Xen update, the system no longer boot - Red Hat<https://bugzilla.redhat.com/show_bug.cgi?id=1286317>
bugzilla.redhat.com
Red Hat Bugzilla – Bug 1286317. With 4.5.2 Xen update, the system no longer boot. Last modified: 2017-08-08 19:49:12 EDT



that for me it's CentOS 7.4 and that the workarounds as described in
that bug do not work.

Does anyone know how I can make my CentOS boot with the Xen hypervisor
using UEFI?

Thank you very much for your help.

Best regards,
John
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