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Re: [Xen-devel] Re: [vt-d][xen4-rc6] Hangs on startup

On Wed, Mar 17, 2010 at 10:48:28PM +0100, Łukasz Oleś wrote:
> 2010/3/17 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>:
> > On Wed, Mar 17, 2010 at 07:20:19PM +0100, Łukasz Oleś wrote:
> > This is troubling:
> > # (XEN) mm.c:859:d0 Error getting mfn 40100 (pfn 5555555555555555) from L1
> > entry 8000000040100473 for l1e_owner=0, pg_owner=32753
> It's happening durring dom0 start with and without iommu enabled.
> > You need to run Linux kernel with more debugging. Use 'debug
> > loglevel=10' to see it conjoined with Xen.
> I need to recompile kernel, then I will post new logs.
> > Also can you try to boot your machine _without_ using X?
> Or you mean domU without XWindow? I will try.

Please do.
> > When is this happening?
> > # (XEN) mm.c:859:d2 Error getting mfn 40010 (pfn 5555555555555555) from L1
> > entry 0000000040010037 for l1e_owner=2, pg_owner=2
> It starts to show after xm create and stops after xm destroy when I
> try to pass-through devices. Without pci=[ <devices>] option there is

What version of Linux kernel do you have in your DomU? There was a
serious problem in 2.6.32 with the Xen fb that causes this type of
failure that was fixed at some point (don't remember the time-frame
thought :-().

I haven't seen this with PCI passthrough on my test-bed - but I do see that
with DRM, which you don't have enabled. Can you make sure you have
the latest version of xen/next from Jeremy's git tree?

> no such error.
> > At what point does this happen in the
> > guest? Can you attach the screenshot of your guest when this is
> > happening?
> My vnc shows only white screen. xm console doesn't work. I have no
> access to guest.

> Without pci option guest works fine and I can connect to it.

Did you try other PCI devices and seen if they do the same thing?
> Regards,
> Łukasz Oleś

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