Re: [Xen-devel] comment request: dom0 dma on large memory systems

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

Yes, something like this is obviously required, and introducing a 
concept of zones seems a sensible way to go. I haven't looked at your 
patch in great detail but it looks along the right lines. :-)
 -- Keir

On 3 Jun 2005, at 08:35, Scott Parish wrote:

> The attached patch is a (non-functional) prototype of my proposed
> solution to the xen. The idea is to add a third MEMZONE for
> dma'able memory, change the alloc_domheap_pages() interface so the
> caller can request only dma memory if needed. Finally, internal to
> common/page_alloc.c, split memory between MEMZONE_DOM and 
> MEMZONE_DMADOM
> based on the address.
>
>
> proposed solution to dom0:
>
> Dom0 might have memory allocated to it from both high and low memory.
> The easiest solution would probably be to scan for and preallocate a
> chunk of memory that will work for dma, something like what pci-gart.c
> does. (or work on letting pci-gart.c work under xen)

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