linux-kernel - Re: [kvm-devel] [PATCH 5/8] KVM: PVDMA: Update dma_alloc

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Message-ID: <20071112105637.GH3299@rhun.haifa.ibm.com>
Date:	Mon, 12 Nov 2007 12:56:37 +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 5/8] KVM: PVDMA: Update dma_alloc_coherent to make it paravirt-aware

On Wed, Nov 07, 2007 at 04:21:06PM +0200, Amit Shah wrote:

> Of all the DMA calls, only dma_alloc_coherent might not actually
> call dma_ops->alloc_coherent. We make sure that gets called if the
> device that's being worked on is a PV device

I always thougt that's a mess... the reason it's done this way is that
Andi Kleen preferred it for some reason at the time. How about trying
to fix it cleanly so that dma_alloc_coherent always gets called rather
than adding a hack to work around a hack? It will require auditing all
of the different x86 dma-ops but I can help with that.

Cheers,
Muli
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