Re: [Xen-devel] Reversing the DMA handle

[Muli Ben-Yehuda <muli@xxxxxxxxxx>]

On Tue, Jan 09, 2007 at 05:17:10PM -0800, Pete Zaitcev wrote:
> Dear Xen developers:
> 
> I maintain a component in Linux kernel, called usbmon. It provides for
> snooping of USB traffic, analoguously to tcpdump. Due to pequliarities
> of USB API in Linux, usbmon has to take a DMA address (coming from
> dma_alloc_coherent() typically), find the corresponding PFN and call
> pkmap()/memcpy()/pkunmap().

Hi Pete, 

Regardless of Xen, how is this supposed to work in the presence of
IOMMUs?

Cheers,
Muli

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