RE: [Xen-devel] direct_remap_area_pages() does not work for multiple pages?

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> In DomU, I used alloc_pages() to allocate contiguous memory pages,
> are they machine contiguous? If not, what's the right way to allocate
> machine contiguous pages? or what's the right way to map 
> multiple pages
> into Dom0?

alloc_pages does not guarantee to return machine contiguous pages. As a
hack, you could use dma_alloc_coherent. The correct approach is to find
out all the mfns that are in use and do multiple direct_remap_area calls
as appropriate. In user space, things are rather nicer as you can use
the xc_map_foreign_batch.

Ian


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