Re: [Xen-users] Create domU with pciback fails, then my system re-boots! xen-hypervisor-4.3-amd64

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-05-05 at 14:04 +0100, Jo Mills wrote:
> OK, a bit more information:
> 
> If I go into the BIOS (latest verion: S3200X38.86B.00.00.52) and 
> disable:
> 
>     Intel(R) Virtualization Technology
>     Intel(R) VT for Directed I/O
>     Multi-Thread Support In MPS table
>     Execute Disable Bit
>     
> then everything works just as it should do (but of course I don't have 
> "I/O virtualisation enabled" which was the whole point of the original 
> exercise).  So it would seem as though there is some horrible 
> interaction between the Intel BIOS and xen-hypervisor-4.3-amd64 
> (4.3.0-3+b1). 
> 
> I have not tried turning off each of the four BIOS items in turn to 
> see if one in particular causes the problem.  If anyone has any 
> suggestions or can point me at some further reading I would be very 
> grateful.  Alternatively, if I need to provide further details I am 
> very willing to do so.

Identifying which of those 4 options is responsible will be useful I
think, (my money is on "VT for Direct I/O", just a gut feeling).

Having done that I think I would recommend posting to the xen-devel
list. Your reports here are pretty comprehensive but you might find the
lists in http://wiki.xen.org/wiki/Reporting_Bugs_against_Xen throw up
something else which might be useful.

In particular if the system is rebooting then getting the Xen (in
addition to the dom0) dmesg would be useful. You might find it helpful
to add noreboot to your hypervisor command line and/or to configure a
serial console (http://wiki.xen.org/wiki/Xen_Serial_Console).

Ian.


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