Re: [Xen-devel] Re: pv_ops dom0 USB fixed

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Jeremy Fitzhardinge wrote:
>   
> > Can you try changing include/linux/libata.h:
> >
> > -#undef ATA_DEBUG        /* debugging output */
> > +#define ATA_DEBUG        /* debugging output */
> >     
> Log became a bit longer ...
> http://kraxel.fedorapeople.org/for-jeremy/
>
> There is also a (maybe related) BUG in there.
>
> It fails notably faster now, early in the init scripts.  Some race
> maybe?   The timing changes due to the excessive debug output makes it
> happen more likely?
>   
Well, it doesn't explain why it happens instantly for everyone else, 
unless there's some really odd timing issue going on.  Is your xen the 
xen-unstable tip?  Do you have DEBUG=y enabled?
> > Also, does swiotlb=0 make any difference?
> >     
> It doesn't.  Hmm, from the boot messages it looks like it doesn't
> actually disable the swiotb ...
Oh, maybe "iommu=off" then?

   J

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