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Date:   Thu, 5 Apr 2018 20:09:30 +0530
From:   Anshuman Khandual <>
        "Michael S. Tsirkin" <>
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 <>

+ "Michael S. Tsirkin" <>

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