Re: [Xen-devel] x86 swiotlb questions

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 19/12/06 12:48, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote:

>> Do we merge okay with lib/swiotlb.c then?
> 
> Not yet - because of the highmem handling needed for i386. I wonder, however,
> how native Linux gets away with not handling this through swiotlb, and why
> nevertheless Xen needs to special case this. Any ideas?

Probably because GFP_KERNEL and GFP_DMA allocations are guaranteed to be
DMAable by 30-bit-capable devices on native, but not on Xen.

 -- Keir


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