Re: Re: Panic on cpu0

[Keir Fraser <keir@xen.org>]

You might need a line like the following in /etc/fstab in dom0:
none /proc/xen xenfs defaults 0 0

 -- Keir

On 16/12/2010 11:24, "ZhouPeng" <zpengxen@gmail.com> wrote:

> Thank you for your reply.
> 
> We want to  work in 32-bit system.
> And fortunately we don't need IOMMU and passthr at the present.
> 
> There is another problem:
> xend start failed
> err msg is:
> xen.lowlevel.xc.Error: (1, "Internal error"), 'Could not obtain handle on
> privileged command interface (2 =  No such file or directory)'
> 
> I find there is nothing in "/proc/xen/" but there is privcmd.o in
> "bulid-linux-2.6-pvos_x86_32/drivers/xen/xenfs/"
> 
> 2010/12/16 Keir Fraser <keir@xen.org>
>> Could you build a 64-bit hypervisor instead? In all honesty, the 32-bit
>> build gets hardly any testing these days, and not much love.
>> 
>>  -- Keir
>> 
>> On 16/12/2010 09:41, "ZhouPeng" <zpengxen@gmail.com> wrote:
>> 
>>> The bug exist in iommu(Intel VT-d) support code.
>>> 
>>> After I disabled the vt-d in bios, system can boot properly.
>>> 
>>> 2010/12/16 ZhouPeng <zpengxen@gmail.com>
>>>> The err msg appears in
>>>> void *map_domain_page(unsigned long mfn)
>>>>       BUG_ON(idx >= MAPCACHE_ENTRIES);
>>>> 
>>>> printk idx is 1024 and BUG_ON is called.
>>>> 
>>>> I print  Xen call trace msg:
>>>> 
>>>> [<ffcd3c2>]  map_domain_page+0x1a2/0x230
>>>> [<ff1cd718>] unmap_domain_page+0x148/0x160
>>>>                    addr_to_dma_page_maddr+0x1f6/0x250
>>>>                    __find_next_zero_bit+0x80/0x90
>>>>                    intel_iommu_map_page+0x14a/0x250
>>>>                    domain_context_mapping+0x14a/0x250
>>>>                    rmrr_identity_mapping+0xb7/0x120
>>>>                    intel_iommu_dom0_init+0x143/0x1eb
>>>>                    construct_dom0+0x138f/0x16b0
>>>>                    __start_xen+0x109a/0x1680
>>>>                    e820nf+0x0/0x4
>>>>                    __high_start+0x58/0x5a
>>>> 
>>>> 2010/12/16 Pasi Kärkkäinen <pasik@iki.fi>
>>>> 
>>>>> On Thu, Dec 16, 2010 at 03:41:17PM +0800, ZhouPeng wrote:
>>>>>>    (XEN) Panic on CPU 0:
>>>>>>    (XEN) Xen BUG at domain_page.c:102
>>>>>> 
>>>>>>    Any solutions?
>>>>>> 
>>>>> 
>>>>> You need to post the full boot log, including all output from both Xen and
>>>>> dom0 Linux.
>>>>> See: http://wiki.xen.org/xenwiki/XenSerialConsole
>>>>> 
>>>>> -- Pasi
>>>>> 
>>>>>>    2010/12/16 ZhouPeng <[1]zpengxen@gmail.com>
>>>>>> 
>>>>>>      Hi all,
>>>>>> 
>>>>>>      I build xen4.1 from the tarbll (with kernel 2.6.32.26 downloaded by
>>>>>>      default) on fedora8.
>>>>>> 
>>>>>>      After installing, I get the err msg on startup:
>>>>>> 
>>>>>>      (XEN) Panic on CPU 0:
>>>>>>      (XEN) Xen BUG at domain_page.c:102
>>>>>> 
>>>>>>      5 seconds later, the machine reboot.
>>>>>> 
>>>>>>      How to deal with this problem.
>>>>>> 
>>>>>>      Thanks,
>>>>>>      --
>>>>>>      Zhou Peng
>>>>>>      My daily E-Mail: [2]ailvpeng25@gmail.com
>>>>>> 
>>>>>>    --
>>>>>>    Zhou Peng
>>>>>>    My daily E-Mail: [3]ailvpeng25@gmail.com
>>>>>> 
>>>>>> References
>>>>>> 
>>>>>>    Visible links
>>>>>>    1. mailto:zpengxen@gmail.com
>>>>>>    2. mailto:ailvpeng25@gmail.com
>>>>>>    3. mailto:ailvpeng25@gmail.com
>>>>> 
>>>>>> _______________________________________________
>>>>>> Xen-devel mailing list
>>>>>> Xen-devel@lists.xensource.com
>>>>>> http://lists.xensource.com/xen-devel
>>>>> 
>>>> 
>>>> 
>> 
>> 
> 
>