Re: Xen 4 and NetBSD

["Dirk H. Schulz" <dirk.schulz%kinzesberg.de@localhost>]

 Am 07.07.10 11:22, schrieb Christoph Egger:
> On Wednesday 07 July 2010 09:59:53 Dirk H. Schulz wrote:
> > Hi folks,
> >
> > I tried to find out if there is a Xen4 implementation for NetBSD (at
> > least a domU kernel), but did not find any real hints.
> >
> > Can someone please direct me to relevant information or just tell me if
> > work is in progress, finished, whatever?
> >
> > Or is it possible to run a NetBSD Xen 3.2/3.3 domU on a Xen4 dom0? Has
> > anyone out there tried that? Any success or experience to share?
> Xen 4 is backward-compatible to Xen 3.x. That means all NetBSD Xen 3
> DomU/Dom0 run on Xen 4.
>
> Christoph
I am afraid it is not that easy. Starting my xen3 NetBSD domU leads to:

> total memory = 256 MB
> avail memory = 245 MB
> mainbus0 (root)
> hypervisor0 at mainbus0: Xen version 4.0
> vcpu0 at hypervisor0: Intel 686-class, 3200MHz, id 0xf41
> xenbus0 at hypervisor0: Xen Virtual Bus Interface
> xencons0 at hypervisor0: Xen Virtual Console Driver
> xencons0: using event channel 2
> npx0 at hypervisor0: using exception 16
> xbd0 at xenbus0 id 1: Xen Virtual Block Device Interface
> xpq_flush_queue: 1 entries
> 0x00000002d2c992e8: 0x000000000ce67003
> panic: HYPERVISOR_mmu_update failed
>
> fatal breakpoint trap in supervisor mode
> trap type 1 code 0 eip c039682c cs 9 eflags 246 cr2 0 ilevel 6
> Stopped in pid 0.12 (system) at netbsd:breakpoint+0x4:  popl    %ebp
I have googled, but found only older entries saying that the dom0 kernel 
must be compiled with unset debugging options. I have done so, but that 
did not help.

Do NetBSD Xen3 domUs really run on Xen4 (I am using the Debian Testing 
hypervisor and dom0)? I found several posts stating that networking is 
broken but no current one describing the above problem.

Any hint or help is appreciated.

Dirk