Re: [Xen-users] Xen Continuously Reboot

[Daniel Widenfalk <Daniel@xxxxxxxxxxxx>]

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.
> >
> > Mike
> 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
> installation?
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:
>
> GRUB_CMDLINE_XEN="dom0_mem=1024M,max=1024M"
>
> 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:

http://xenbits.xenproject.org/docs/unstable/misc/xen-command-line.html

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
/D

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