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RE: [Xen-devel] VP problematic for backend drivers on IA64?
| To: | "Muli Ben-Yehuda" <mulix@xxxxxxxxx>, "Magenheimer, Dan \(HP Labs Fort Collins\)" <dan.magenheimer@xxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] VP problematic for backend drivers on IA64? |
| From: | "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> |
| Date: | Tue, 24 Jan 2006 23:42:51 -0000 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, okrieg@xxxxxxxxxx |
| Delivery-date: | Tue, 24 Jan 2006 23:51:31 +0000 |
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| Thread-index: | AcYdZJoamDpb2wGdTQihqq/ZOEmwiAD2ssbw |
| Thread-topic: | [Xen-devel] VP problematic for backend drivers on IA64? |
> I understand that during the IA64 session at the summit there > was some discussion on VP being problematic for the current > backend drivers (or the other way around), and IOMMUs were > suggested as a possible solution. Could you please elaborate > on what's the problem? It's simply that the actual DMA operations need to use machine addresses. Ideally, you'd use an iommu to translate/partition, but in the absence of an iommu simply enabling a privileged domain to read its p2m table and translate the pfn to an mfn is sufficient. Ian _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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