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

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Date:	Wed, 28 Oct 2015 11:15:30 +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 Tue, Oct 27, 2015 at 06:17:10PM -0700, Andy Lutomirski wrote:
> From: Andy Lutomirski <luto@...capital.net>
> 
> This fixes virtio-pci on platforms and busses that have IOMMUs.  This
> will break the experimental QEMU Q35 IOMMU support until QEMU is
> fixed.  In exchange, it fixes physical virtio hardware as well as
> virtio-pci running under Xen.
> 
> We should clean up the virtqueue API to do its own allocation and
> teach virtqueue_get_avail and virtqueue_get_used to return DMA
> addresses directly.
> 
> Signed-off-by: Andy Lutomirski <luto@...nel.org>
> ---
>  drivers/virtio/virtio_pci_common.h |  3 ++-
>  drivers/virtio/virtio_pci_legacy.c | 19 +++++++++++++++----
>  drivers/virtio/virtio_pci_modern.c | 34 ++++++++++++++++++++++++----------
>  3 files changed, 41 insertions(+), 15 deletions(-)

Same here, you need to call the dma_sync* functions when passing data
from/to the virtio-device.

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



	Joerg

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