linux-kernel - Re: [PATCH 3/3] virtio

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Date:	Wed, 28 Oct 2015 11:25:24 +0900
From:	Joerg Roedel <jroedel@...e.de>
To:	Andy Lutomirski <luto@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Sebastian Ott <sebott@...ux.vnet.ibm.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Christoph Hellwig <hch@....de>, benh@...nel.crashing.org,
	KVM <kvm@...r.kernel.org>, dwmw2@...radead.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>
Subject: Re: [PATCH 3/3] virtio_pci: Use the DMA API

On Wed, Oct 28, 2015 at 11:15:30AM +0900, Joerg Roedel wrote:
> Same here, you need to call the dma_sync* functions when passing data
> from/to the virtio-device.

Okay, forget about this comment. This patch only converts to
dma_coherent allocations, which don't need synchronization.

> I think a good test for that is to boot a virtio kvm-guest with
> swiotlb=force and see if it still works.

But this holds, Its a good way to test if your changes work with
bounce-buffering. Together with DMA_API_DEBUG you also see if your
specified dma_directions are right.



	Joerg

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