[Xen-users] Confused by the Xen serial console

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi,

I noticed the other day that magic sysrq[1] over serial no longer
works on the machines I have upgraded to Debian etch, but continues
to work on the one machine left on Debian sarge.

I rebooted one of them into the normal (non-xen) Debian kernel and
magic sysrq works again.  In poking around, I did succeed in
completely breaking my serial console, but did not manage to fix
sysrq.  I'm now more confused than ever.

Here's what I have in grub:

title           Xen 3.0.3-1-i386-pae / Debian GNU/Linux, kernel 2.6.18-4-xen-686
root            (hd0,1)
kernel          /xen-3.0.3-1-i386-pae.gz com1=9600,8n1 console=com1,vga 
dom0_mem=1024M
module          /vmlinuz-2.6.18-4-xen-686 root=/dev/sda3 ro console=tty0 
console=ttyS0
module          /initrd.img-2.6.18-4-xen-686
savedefault

This gives me all the console output from Xen and the normal Linux
kernel.  It's pretty much perfect, except sysrq doesn't work.

I tried disabling the xen serial console parts, leaving me with
this:

title           Xen 3.0.3-1-i386-pae / Debian GNU/Linux, kernel 2.6.18-4-xen-686
root            (hd0,1)
kernel          /xen-3.0.3-1-i386-pae.gz dom0_mem=1024M
module          /vmlinuz-2.6.18-4-xen-686 root=/dev/sda3 ro console=tty0 
console=ttyS0
module          /initrd.img-2.6.18-4-xen-686
savedefault

That results in no serial console whatsoever after grub.

I don't think I need the Xen serial console, so if I need to disable
it to make the Linux one work properly then that's fine.  Does
anyone know where I am going wrong?

This is with Debian's xen 3.0.3-1 package.

Cheers,
Andy

[1] http://en.wikipedia.org/wiki/Magic_SysRq_key

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