Re: [Xen-devel] Re: Panic on cpu0

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Dec 16, 2010 at 07:24:51PM +0800, ZhouPeng wrote:
>    Thank you for your reply.
> 
>    We want to  work in 32-bit system.
>

You know you can have a 32bit dom0 kernel running on 64bit Xen hypervisor?

-- Pasi

>    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 <[1]keir@xxxxxxx>
> 
>      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" <[2]zpengxen@xxxxxxxxx> 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 <[3]zpengxen@xxxxxxxxx>
>      >> 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 <[4]pasik@xxxxxx>
>      >>
>      >>> 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: [5]http://wiki.xen.org/xenwiki/XenSerialConsole
>      >>>
>      >>> -- Pasi
>      >>>
>      >>>>    2010/12/16 ZhouPeng <[1][6]zpengxen@xxxxxxxxx>
>      >>>>
>      >>>>      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][7]ailvpeng25@xxxxxxxxx
>      >>>>
>      >>>>    --
>      >>>>    Zhou Peng
>      >>>>    My daily E-Mail: [3][8]ailvpeng25@xxxxxxxxx
>      >>>>
>      >>>> References
>      >>>>
>      >>>>    Visible links
>      >>>>    1. mailto:[9]zpengxen@xxxxxxxxx
>      >>>>    2. mailto:[10]ailvpeng25@xxxxxxxxx
>      >>>>    3. mailto:[11]ailvpeng25@xxxxxxxxx
>      >>>
>      >>>> _______________________________________________
>      >>>> Xen-devel mailing list
>      >>>> [12]Xen-devel@xxxxxxxxxxxxxxxxxxx
>      >>>> [13]http://lists.xensource.com/xen-devel
>      >>>
>      >>
>      >>
> 
>    --
>    Zhou Peng
>    My daily E-Mail: [14]ailvpeng25@xxxxxxxxx
> 
> References
> 
>    Visible links
>    1. mailto:keir@xxxxxxx
>    2. mailto:zpengxen@xxxxxxxxx
>    3. mailto:zpengxen@xxxxxxxxx
>    4. mailto:pasik@xxxxxx
>    5. http://wiki.xen.org/xenwiki/XenSerialConsole
>    6. mailto:zpengxen@xxxxxxxxx
>    7. mailto:ailvpeng25@xxxxxxxxx
>    8. mailto:ailvpeng25@xxxxxxxxx
>    9. mailto:zpengxen@xxxxxxxxx
>   10. mailto:ailvpeng25@xxxxxxxxx
>   11. mailto:ailvpeng25@xxxxxxxxx
>   12. mailto:Xen-devel@xxxxxxxxxxxxxxxxxxx
>   13. http://lists.xensource.com/xen-devel
>   14. mailto:ailvpeng25@xxxxxxxxx

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