Xen users - Feb 2013 - Can't boot dom0 after upgrading to non-modified kernel

Hi,

I am migrating my gentoo server from the modified kernel 2.6.38 modified to
the plain 3.6.11 kernel from the distribution.

domUs all work fine with the new kernel, after a few changes in the configs
(such as changing /dev/sd... to /dev/xvd...) but dom0 won''t boot when
using
the new kernel. It fails saying something like "please append a correct
root=" (It reboots right away, I barely have time to read).

In other words, this grub entry works fine (kernel is xen-sources):
root (hd0,1)
kernel /boot/xen.gz dom0_mem=4096M dom0_max_vcpus=1 dom0_vcpus_pin
module /boot/kernel-2.6.38-xen-dom0 root=/dev/sda6


This grub setting fails (kernel is gentoo-sources):
root (hd0,1)
kernel /boot/xen.gz dom0_mem=4096M dom0_max_vcpus=1 dom0_vcpus_pin
module /boot/kernel-3.6.11-gentoo root=/dev/sda6

I have compiled the kernel with all options mentioned in the gentoo xen
doc, do you know of anything I might be missing?

Thanks a lot in advance,

Sylvain


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On Sat, 2013-02-16 at 11:30 +0000, Sylvain Chevalier wrote:
> 
> This grub setting fails (kernel is gentoo-sources):
> root (hd0,1)
> kernel /boot/xen.gz dom0_mem=4096M dom0_max_vcpus=1 dom0_vcpus_pin
> module /boot/kernel-3.6.11-gentoo root=/dev/sda6
Does this kernel boot natively? Are you sure you have all the necessary
drivers etc?

Given the lack of logs it is rather hard to give any more specific
advice.

Ian.

At 12:30 16.02.2013, you wrote:
>domUs all work fine with the new kernel, after a few changes in the 
>configs (such as changing /dev/sd... to /dev/xvd...) but dom0 won''t
>boot when using the new kernel. It fails saying something like 
>"please append a correct root=" (It reboots right away, I barely 
>have time to read).
use a camera and rewind the movie ;-)
>This grub setting fails (kernel is gentoo-sources):
>root (hd0,1)
>kernel /boot/xen.gz dom0_mem=4096M dom0_max_vcpus=1 dom0_vcpus_pin
>module /boot/kernel-3.6.11-gentoo root=/dev/sda6
>
>I have compiled the kernel with all options mentioned in the gentoo 
>xen doc, do you know of anything I might be missing?
doesn''t sound like a xen-problem in first place.

Did you double-check all FS-Options and all drivers for your 
chipset/HD-Controllers?

Christian



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On Mon, 2013-02-18 at 10:53 +0000, Christian Holpert
wrote:
> At 12:30 16.02.2013, you wrote:
> >domUs all work fine with the new kernel, after a few changes in the 
> >configs (such as changing /dev/sd... to /dev/xvd...) but dom0
won''t
> >boot when using the new kernel. It fails saying something like 
> >"please append a correct root=" (It reboots right away, I
barely
> >have time to read).
> 
> use a camera and rewind the movie ;-)
Or add "noreboot" to your hypervisor command line.

Ian.

Thanks Ian, I am embarrassed, it was indeed a missing driver that was
dropped when migrating the .config. It now works well, it really makes
things way more convenient to use the kernel directly from the
distrib''s
main tree.


On Mon, Feb 18, 2013 at 6:22 PM, Ian Campbell
<Ian.Campbell@citrix.com>wrote:
> On Sat, 2013-02-16 at 11:30 +0000, Sylvain Chevalier wrote:
>
> >
> > This grub setting fails (kernel is gentoo-sources):
> > root (hd0,1)
> > kernel /boot/xen.gz dom0_mem=4096M dom0_max_vcpus=1 dom0_vcpus_pin
> > module /boot/kernel-3.6.11-gentoo root=/dev/sda6
>
> Does this kernel boot natively? Are you sure you have all the necessary
> drivers etc?
>
> Given the lack of logs it is rather hard to give any more specific
> advice.
>
> Ian.
>
>
>

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