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Re: [Xen-users] Xen Continuously Reboot

  • To: xen-users@xxxxxxxxxxxxx
  • From: Daniel Widenfalk <Daniel@xxxxxxxxxxxx>
  • Date: Sat, 11 Jun 2016 09:09:46 +0200
  • Delivery-date: Sat, 11 Jun 2016 07:10:39 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

Hi Ray,

On 2016-06-11 04:07, Ray wrote:

Date: Thu, 9 Jun 2016 09:19:15 -0700
From: "russo@xxxxxxxxxxxxxxxxxxx" <russo@xxxxxxxxxxxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen Continuously Reboots
Message-ID: <57599703.4070804@xxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"; Format="flowed"

You have one guest? I would delete the guest and see if it boots
normally. If so, the the guess was configured incorrectly and you may
need to trial and error the problem.
My experience with the machine going into a endless reboot was giving
too much memory to the guest.


I moved the guest to another folder, rebooted to Xen, and the system
hung at the same point.

Rather than chase down misconfigurations, I will reinstall the system.
I have reinstalled this 22 times.  The number of possible failures is
much larger than the time to reinstall.

I think you should move forward with minimal changes, yes. Start
with the grub fix I gave you earlier as that gives you a working
xen console. Also, try adding console=vga to the xen command line.

Do you have access to a serial port (doubtful on a modern laptop) so
that you can use that to look at the XEN console and be able to capture
it before the system hangs? I think I've seen traces in the source code
of being able to have a USB serial port work as console. Is this
possible? How does it work? (I'm asking our more knowledgeable readers)

I am shooting for a minimal dom0.  With the 4K display, I want to make
the screen readable with I make the next installation.  I have an iso
for stretch but I will get the latest and dd it to a thumb drive.  I
have another thumb drive with the Intel wifi drivers.  0

How do I make the display readable without compromising the Xen

I would start by using a plain ol' magnifying glass tbh. The less you
tinker the better. I think xen will start booting in VGA 80x25 text
mode anyway and unless your display/GPU is messing with you that should
get scaled up by the display.

Also, make sure to install any firmware packages you need before
rebooting into xen :)

The Debian wiki for installing Xen has some grub configurations which I
followed.  Do you have any recommendations was to whether to follow
these?  https://wiki.debian.org/Xen:


I used 2048 instead of 1024 due to notes on 1024 being too small.

Edit /etc/xen/xend-config.sxpto configure the toolstack to match by
changing the following settings:

(dom0-min-mem 1024)
(enable-dom0-ballooning no)

Debian Jessie and Stretch both use xl and not xend/xm. I think that
means you need to edit xl.conf. See:


and xl.conf(5).

I did not do any changes to my xen config to get it to boot (besides
the efi fix in the grub files). I had a lot of issues getting cpu
frequency scaling to work but that was mostly due to an incompatibility
between xen and a bios setting. All sorted now.

Another thing you might want to consider is to disable EFI boot and
do a normal legacy install just to see if it makes any difference
(it shouldn't).

Sorry for not being able to give better advice

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