Re: [Xen-devel] USB virt status --- Help please!!!

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 13 Nov 2005, at 18:28, Harry Butterworth wrote:

> Is this the right approach? Is the check in dma_map_single overzealous?
When running on Xen, just because Linux has allocated adjacent pages 
from its 'physical' memory map, doesn't mean they really are physically 
contiguous. For I/O we have to go to extra effort to really allocate 
truly contiguous multi-page extents.
So your code is correct. If you can preallocate buffers then you could 
do that with dma_alloc_coherent and that would guarantee contigous 
buffers....
 -- Keir


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