Re: [Xen-devel] Error booting Xen

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 03/02/16 12:55, Dario Faggioli wrote:
> On Wed, 2016-02-03 at 17:05 +0530, Harmandeep Kaur wrote:
>> On Wed, Feb 3, 2016 at 1:53 PM, Dario Faggioli
>> <dario.faggioli@xxxxxxxxxx> wrote:
>>>  
>> Maybe I failed to shutdown a guest which was showing up
>> on next boot. But there are no auto-starting guests.
>> Following link goes to latest serial log
>> http://paste2.org/5PDz9bP1 
>>
> No, sorry, I probably am not getting. Are you saying that, just booting
> Xen and *not* doing anything else --either from SSH, from the keyboard
> of that box, from serial connection... anything at all-- and without
> any guest configured to auto start itself, results in these lines to
> appear on your serial console?
>
> tbox login: (d1) mapping kernel into physical memory
> (d1) about to get started...
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 00000000c0000081 from 
> 0xe023e00800000000 to 0x0023001000000000.
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 00000000c0000082 from 
> 0xffff82d0bfffe080 to 0xffffffff817ef990.
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 00000000c0000083 from 
> 0xffff82d0bfffe0a0 to 0xffffffff817f1f60.
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 0000000000000174 from 
> 0x000000000000e008 to 0x0000000000000010.
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 0000000000000175 from 
> 0xffff83026d40ffc0 to 0x0000000000000000.
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 0000000000000176 from 
> 0xffff82d08023eaf0 to 0xffffffff817f1d60.
> (XEN) traps.c:2684:d1v0 Domain attempted WRMSR 00000000c0000084 from 
> 0x0000000000074700 to 0x0000000000047700.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 00000000c0000081 from 
> 0xe023e00800000000 to 0x0023001000000000.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 00000000c0000082 from 
> 0xffff82d0bffff000 to 0xffffffff817ef990.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 00000000c0000083 from 
> 0xffff82d0bffff020 to 0xffffffff817f1f60.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 0000000000000174 from 
> 0x000000000000e008 to 0x0000000000000010.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 0000000000000175 from 
> 0xffff8300866fffc0 to 0x0000000000000000.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 0000000000000176 from 
> 0xffff82d08023eaf0 to 0xffffffff817f1d60.
> (XEN) traps.c:2684:d1v1 Domain attempted WRMSR 00000000c0000084 from 
> 0x0000000000074700 to 0x0000000000047700.
>
> Because this is what you just said above, and that's... well... just
> impossible?!?! :-O

This is a Linux PV trying to set up the SYSCALL/SYSENTER MSRs when it
shouldn't.  There is a fix upstream, but this specifically is harmless
noise.

~Andrew

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