Re: [PATCH 5/5] virtio-blk: Consider virtio_max_dma_size() for maximum segment size

[Christoph Hellwig]

On Thu, Jan 24, 2019 at 09:40:11AM +0100, Joerg Roedel wrote:
> > I wonder if we should just move the dma max segment size check
> > into blk_queue_max_segment_size so that all block drivers benefit
> > from it.  Even if not I think at least the SCSI midlayer should
> > be updated to support it.
> 
> In that case the limit would also apply to virtio-blk even if it doesn't
> use the DMA-API. If that is acceptable we can move the check to
> blk_queue_max_segment_size().

Yes.  But more importantly it would fix the limit for all other block
drivers that set large segment sizes when running over swiotlb.