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

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Gerd Hoffmann wrote:
> Jeremy Fitzhardinge wrote:
>   
> > > Intel 64bit box, 6GB RAM (dom0_mem=2g), running rawhide.
> > >       
> > OK, that's interesting.  The symptom is the same (drive stops talking),
> > but after a while rather than immediate.
> >     
> Yep.
>
>   
> > That suggests there might be
> > some issue with what memory gets allocated or something?
> >     
> Or translated.  Maybe it grooks due to being fed with an invalid bus
> address where it can't DMA do.
Can you try changing include/linux/libata.h:

-#undef ATA_DEBUG               /* debugging output */
+#define ATA_DEBUG              /* debugging output */

and see what happens as it nears failure? The difference for me is ATA 
(fails) vs ATAPI (works) for the DVD drive - but they follow essentially 
the same code path.  But if you're getting some disk IO, then there has 
to be more to it than that.
Also, does swiotlb=0 make any difference?

   J

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