Re: [PATCH 4/5] virtio: Introduce virtio_max_dma_size()

[Christoph Hellwig]

On Tue, Jan 29, 2019 at 09:43:41AM +0100, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@xxxxxxx>
> 
> This function returns the maximum segment size for a single
> dma transaction of a virtio device. The possible limit comes
> from the SWIOTLB implementation in the Linux kernel, that
> has an upper limit of (currently) 256kb of contiguous
> memory it can map. Other DMA-API implementations might also
> have limits.
> 
> Use the new dma_max_mapping_size() function to determine the
> maximum mapping size when DMA-API is in use for virtio.
> 
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>

Looks good,

Reviewed-by: Christoph Hellwig <hch@xxxxxx>