RE: [Xen-devel] swiotlb and Xen query?

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

[snip]
> 
> 
> That was really very informative Mats.
> Thanks you very much for the help.
> So, i guess swiotlb comes into picture only if there is a DMA 
> transfer from a domU whose p2m mapping turns out to be above 
> the 4GB( assuming device to be 32 bit) of the machine memory. 
> Other wise just normal p2m mapping is enough to find the 
> actual machine address, which can be handed over to the 
> device for DMAing. Am i right? 

Yes, that's pretty much how it works. In theory, it could be that
devices only work on a 31, 28 or some other number of bit-range, but
yes, that's the principle. 

--
Mats
> 
> Thank you once again for the patience. 
> 
> Regards
> ~psr
> 
[snip]



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