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Re: [Xen-devel] Reversing the DMA handle
| To: | Pete Zaitcev <zaitcev@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] Reversing the DMA handle |
| From: | Muli Ben-Yehuda <muli@xxxxxxxxxx> |
| Date: | Wed, 10 Jan 2007 05:25:08 +0200 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 09 Jan 2007 19:24:51 -0800 |
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| In-reply-to: | <20070109171710.b4cf6ec6.zaitcev@xxxxxxxxxx> |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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