RE: [Xen-ia64-devel] Keyboard and Mouse are disable in Xen0 terminal

[Alex Williamson <alex.williamson@xxxxxx>]

On Mon, 2006-06-19 at 21:04 +0800, Tian, Kevin wrote:
> Hi, Kangkang,
>       This phenomenon is rooted caused by Rev 10373 which adds 
> mfn_to_local_pfn to xen/ia64. The problem is that this inline function 
> is implemented on top of mfn_to_pfn (dummy passthrough) instead 
> of mfn_to_pfn_for_dma, while the place to call mfn_to_local_pfn is in 
> swiotlb. Not sure why only USB device is affected by this bug.

   My guess would be because it's a 32bit PCI device.  I tried another
system with a 32bit NIC and was not able to move any packets across it.

>       Yes, the quick solution can be to use mfn_to_pfn_for_dma version 
> for now.

   I updated our version mfn_to_local_pfn() to use mfn_to_pfn_for_dma()
and things seem to be happier.  Thanks for tracking this down.  Having
this hypercall in the DMA path is, of course, highly undesirable.
Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


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