Re: [kvm-devel] [PATCH 3/8] KVM: PVDMA Guest: Guest-side routines for paravirtualized DMA

[Muli Ben-Y. <mu...@il...>]

On Wed, Nov 07, 2007 at 04:21:04PM +0200, Amit Shah wrote:

> We make the dma_mapping_ops structure to point to our structure so
> that every DMA access goes through us. (This is the reason this only
> works for 64-bit guest. 32-bit guest doesn't yet have a dma_ops
> struct.)

I need the same facility for Calgary for falling back to swiotlb if a
translation is disabled on some slot, and IB needs the same facility
for some IB adapters (e.g., ipath). Perhaps it's time to consider
stackable dma-ops (unless someone has a better idea...).

Cheers,
Muli