Xen devel - Jan 2010 - pv-ops dom0 doesn''t boot, serial console broken

I did a basic make install on a fresh Debian Lenny box this morning,
and unfortunately haven''t been able to successfully boot under Xen:
* The 2.6.27-xen-686 Lenny kernel hangs under Xen-32-PAE and under Xen-64
* Under native, the 2.6.31.6 pv-ops kernel (pulled fresh this morning)
boots fine, with serial console
* Under Xen, the same kernel doesn''t boot and doesn''t output
anything
to the serial console, hanging after a few minutes.

Here''s the console log of booting Linux 2.6.31.6 pv-ops (build with
"make kernels") on a 64-bit hypervisor c/s 20858:2636e5619708 is
attached.

Any ideas?

I wouldn''t be surprised if I''ve misconfigured something, but
the fact
that the exact same kernel works fine on bare metal makes me think it
likely to be something else...

 -George


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On Tue, Jan 26, 2010 at 05:19:38PM +0000, George Dunlap
wrote:
> I did a basic make install on a fresh Debian Lenny box this morning,
> and unfortunately haven''t been able to successfully boot under
Xen:
> * The 2.6.27-xen-686 Lenny kernel hangs under Xen-32-PAE and under Xen-64
> * Under native, the 2.6.31.6 pv-ops kernel (pulled fresh this morning)
> boots fine, with serial console
> * Under Xen, the same kernel doesn''t boot and doesn''t
output anything
> to the serial console, hanging after a few minutes.
What does your grub configuration entry look like?
> 
> Here''s the console log of booting Linux 2.6.31.6 pv-ops (build
with
> "make kernels") on a 64-bit hypervisor c/s 20858:2636e5619708 is
> attached.
> 
> Any ideas?
Dom0 boots. It probably just is outputing to nowhehere land.


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On 26/01/2010 17:19, "George Dunlap" <dunlapg@umich.edu> wrote:
> Here''s the console log of booting Linux 2.6.31.6 pv-ops (build
with
> "make kernels") on a 64-bit hypervisor c/s 20858:2636e5619708 is
> attached.
> 
> Any ideas?
The Xen logging indicates some stuff is happening after dom0 is started.
Probably either the console= option is incorrect, or if this is all
happening before normal console output is initialised, at least earlyprintk
should print something out I think. Clearly dom0 initialisation is getting
reasonably far if it''s tickling IRQ related bits and pieces.

 -- Keir



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On Tue, Jan 26, 2010 at 05:19:38PM +0000, George Dunlap
wrote:
> I did a basic make install on a fresh Debian Lenny box this morning,
> and unfortunately haven''t been able to successfully boot under
Xen:
> * The 2.6.27-xen-686 Lenny kernel hangs under Xen-32-PAE and under Xen-64
> * Under native, the 2.6.31.6 pv-ops kernel (pulled fresh this morning)
> boots fine, with serial console
> * Under Xen, the same kernel doesn''t boot and doesn''t
output anything
> to the serial console, hanging after a few minutes.
> 
> Here''s the console log of booting Linux 2.6.31.6 pv-ops (build
with
> "make kernels") on a 64-bit hypervisor c/s 20858:2636e5619708 is
> attached.
> 
> Any ideas?
> 
> I wouldn''t be surprised if I''ve misconfigured something,
but the fact
> that the exact same kernel works fine on bare metal makes me think it
> likely to be something else...
> 
There are example grub.conf entries here (including serial console):
http://wiki.xensource.com/xenwiki/XenParavirtOps

And more details about serial console here:
http://wiki.xensource.com/xenwiki/XenSerialConsole

Hopefully that helps.

-- Pasi


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