Xen dom0 fails on boot

Xen dom0 fails on boot

[Brian Hays]

Hello, I am trying to boot Xen on one of my new servers and get the
following upon kernel boot ...

(XEN) PCI ...

It checks all of the IRQS, the ide bridge... etc

Then it says...

(XEN) mtrr 2.0

Then hangs indefinitely

Is this a known issue on certain systems? It's all standard hardware
(Intel 865 chipset motherboard (intel brand board) Seagate hard drive,
normal ram..)
Any idea what I can change to get this to boot up?

Thanks,
Brian

Re: Xen dom0 fails on boot

[Keir Fraser]

On 28 Mar 2005, at 16:08, Brian Hays wrote:

> Hello, I am trying to boot Xen on one of my new servers and get the
> following upon kernel boot ...
>
> (XEN) PCI ...
>
> It checks all of the IRQS, the ide bridge... etc
>
> Then it says...
>
> (XEN) mtrr 2.0
>
> Then hangs indefinitely
>
> Is this a known issue on certain systems? It's all standard hardware
> (Intel 865 chipset motherboard (intel brand board) Seagate hard drive,
> normal ram..)
> Any idea what I can change to get this to boot up?

It may be worth commenting out mtrr_init in arch/x86/mtrr/main.c and 
see if that solves the problem. It may be failing on the thing it does 
after mtrr initialisation, but this is worth checking.

  -- Keir

Re: Xen dom0 fails on boot

[Rik van Riel]

On Mon, 28 Mar 2005, Brian Hays wrote:

> (XEN) mtrr 2.0
> 
> Then hangs indefinitely
> 
> Is this a known issue on certain systems?

Yes, I've been seeing it for a while now.

> Any idea what I can change to get this to boot up?

Apply the patch I just posted.  There was a missing barrier
in xen/arch/x86/smpboot.c.

Subject: [Xen-devel] [PATCH] make SMP boot again with gcc 4

-- 
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan