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Re: [Xen-users] Xen Continuously Reboots

  • To: xen-users@xxxxxxxxxxxxx
  • From: Daniel Widenfalk <Daniel@xxxxxxxxxxxx>
  • Date: Wed, 8 Jun 2016 17:44:33 +0200
  • Delivery-date: Wed, 08 Jun 2016 15:45:55 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

On 2016-06-08 14:48, Ray wrote:
Date: Tue, 7 Jun 2016 13:48:12 -0700
From: "russo@xxxxxxxxxxxxxxxxxxx" <russo@xxxxxxxxxxxxxxxxxxx>
To: xen-users@xxxxxxxxxxxxx
Subject: Re: [Xen-users] Xen Continuously Reboots
Message-ID: <5757330C.4050501@xxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset=utf-8; format=flowed

You maybe allocating too much memory to your guests.

Thank you.  I can really use the help as I have not been able to get a
VM running yet.
The machine has 16 GB of RAM.  I had included a line to limit the guest
RAM to 2GB.  Xen would still not boot.  Then I removed the limits and
still Xen would not boot.

As far as I can tell you've yet to manage to boot your Dom0 so
your guests have not yet started. You can also assign a hard locked
amount of memory to your Dom0 and disable balooning (the process of
dynamically adjusting the amount of memory that a guest have available).

Would a VM with a high RAM demand stop Xen from booting?  I thought a VM
would not run until after Xen us up.  I could delete the VM
configuration and try to boot to Xen, then there would be no VM demand
on memory.

I would suggest you disable (i.e. move the config files to a safe
location) rather than deleting your domUs. First priority should be
to get your dom0 booted and you logged in as root :)

What xen options have you set up in /etc/default/grub? My
GRUB_CMDLINE_XEN does not contain anything related to the vga
console so that should not be an issue. (don't forget to run
update-grub! I'm forgetting it about every other update...)

When you do a bare metal boot of your linux, is your graphics
driver being loaded as a module or are you using ye good old
vga console?

Is your dom0 set up to use a desktop or are you booting a text-mode
server only system? It might be worth disabling anything desktop:y
until you've sorted the boot issues.

I've swapped over my dom0 to use the sysv init system (I'm an old dog,
don't want to learn to sit in a new fancy way) but remember that there
was a significant delay from the first boot message until I got access
to my console. How long have you waited? (I'm guessing 60+ seconds)

/Daniel W


On 06/06/2016 12:49 AM, Daniel Widenfalk wrote:
> On 2016-06-06 03:22, Ray wrote:
>> Re: [Xen-users] Xen Continuously Reboots
>> To: xen-users@xxxxxxxxxxxxx
>> From: Daniel Widenfalk <Daniel@xxxxxxxxxxxx>
>> Date: Sun, 5 Jun 2016 22:52:36 +0200
>> Delivery-date: Sun, 05 Jun 2016 20:53:33 +0000
>> List-id: Xen user discussion <xen-users.lists.xen.org>
>>>> On 2016-06-05 20:11, Ray wrote:
>>>> When I boot to Xen, the machine reboots over and over. This is a
>>>> laptop
>>>> with stretch and Xen.
>>>> <snipped>
>>>> Ray
>>> * Are you using EFI or legacy boot?
>>> * How far do you get? Do you get the quick "Loading XEN..." thing at
>>> the
>>> start? Do you start seeing the xen pre-boot phase?
>>> /Daniel W.
>> ______________________________
>> Daniel,
>> Thank you:
>> This is an EFI boot.
>> Once at the boot menu and the 5 seconds lapsed, the system went blank
>> and started booting.
>> Ray
> Hi,
> I've found that both Jessie and Stretch seem to have an error in their
> grub code for xen. The grub code does not recognize "efi" as a valid
> grub platform and therefore applies no-real-mode and eff=off to xen.
> "no-real-mode" means you will not get a VGA console and edd=off means
> xen will not fetch "Extended Disc Data" (whatever that means) from the
> bios.
> On my new system I had to edit /etc/grub/20_linux_xen (line 126) and
> add "efi" as a recognized boot platform:
> ---- Lines 125 - 30:
> echo '$(echo "$xmessage" | grub_quote)'
> if [ "\$grub_platform" = "pc" -o "\$grub_platform" = "efi" -o
> "\$grub_platform" = "" ]; then
> xen_rm_opts=
> else
> xen_rm_opts="no-real-mode edd=off"
> fi
> ----
> After making this change I got a working xen/linux vga console and could
> see what was going on. I hope this helps :)
> Best regards
> /Daniel Widenfalk

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