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

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Date:	Mon, 12 Nov 2007 12:50:01 +0200
From:	Muli Ben-Yehuda <muli@...ibm.com>
To:	Amit Shah <amit.shah@...ranet.com>
Cc:	kvm-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [kvm-devel] [PATCH 3/8] KVM: PVDMA Guest: Guest-side routines for paravirtualized DMA

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
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