Re: [Xen-devel] [PATCH 0 of 5] Add support for mapping grant references into HVM guests (+ some cleanup)

["Justin T. Gibbs" <gibbs@xxxxxxxxxxx>]

On 12/18/2009 9:05 AM, Keir Fraser wrote:
> Support is already in the tree and will be part of Xen 4.0. See xen-unstable
> changeset 19932:c0cb307d927f.
>
>   -- Keir
>    
I have successfully integrated the 4.0 change into my 3.4.1 test 
system.  The changes works as expected
so long as the I/O is serviced via a copy from memory owned by the 
device domain.  However, iommu
mappings are not updated for HVM grant table updates so it is not 
possible to use DMA.  I am experimenting
with changes to update the iommu for p2m_grant_map* types but wonder is 
some overarching
architectural consideration I'm missing that would explain why the iommu 
was not updated in the original
changes?

--
Justin

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