RE: [Xen-devel] Driver domain questions

["Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>]

Mark,

Thanks for the answers.

> What you really need in a lot of cases is some kind of IOMMU: the
guest
> won't
> be able to issue correct DMA requests because it is unaware of the
> underlying
> memory structure.  I'm not clear if it's possible on any particular
OSes
> to
> implement this in software via a custom bus type (where the usual DMA
> mapping
> API would be used to translate phys->mach and create bounce buffers if
> necessary).

My query was w.r.t *not* having a hardware based IOMMU in the picture. I
realize that true isolation cannot be achieved without hardware IOMMU. I
was looking to see what it would take (amount of work, difficulty etc)
to give direct PCI access to HVM domains with just software.

Cheers,
Aravindh

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