linux-kernel - Re: [RFC] virtio: Use DMA MAP API for devices without an IOMMU

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Message-Id: <3e1b113b-79ca-b700-5be9-10c66d74aabe@linux.vnet.ibm.com>
Date:   Thu, 5 Apr 2018 20:09:30 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Cc:     robh@...nel.org, aik@...abs.ru, jasowang@...hat.com,
        joe@...ches.com, linuxppc-dev@...ts.ozlabs.org,
        elfring@...rs.sourceforge.net, david@...son.dropbear.id.au,
        "Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [RFC] virtio: Use DMA MAP API for devices without an IOMMU

On 04/05/2018 04:26 PM, Anshuman Khandual wrote:
> There are certian platforms which would like to use SWIOTLB based DMA API
> for bouncing purpose without actually requiring an IOMMU back end. But the
> virtio core does not allow such mechanism. Right now DMA MAP API is only
> selected for devices which have an IOMMU and then the QEMU/host back end
> will process all incoming SG buffer addresses as IOVA instead of simple
> GPA which is the case for simple bounce buffers after being processed with
> SWIOTLB API. To enable this usage, it introduces an architecture specific
> function which will just make virtio core front end select DMA operations
> structure.
> 
> Signed-off-by: Anshuman Khandual <khandual@...ux.vnet.ibm.com>

+ "Michael S. Tsirkin" <mst@...hat.com>