linux-kernel - Re: [PATCH 0/5 v3] Fix virtio-blk issue with SWIOTLB

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Date:   Wed, 23 Jan 2019 12:09:48 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, jfehlig@...e.com,
        jon.grimm@....com, brijesh.singh@....com, jroedel@...e.de
Subject: Re: [PATCH 0/5 v3] Fix virtio-blk issue with SWIOTLB

On Wed, Jan 23, 2019 at 05:30:44PM +0100, Joerg Roedel wrote:
> Hi,
> 
> here is the third version of this patch-set. Previous
> versions can be found here:
> 
> 	V1: https://lore.kernel.org/lkml/20190110134433.15672-1-joro@8bytes.org/
> 
> 	V2: https://lore.kernel.org/lkml/20190115132257.6426-1-joro@8bytes.org/
> 
> The problem solved here is a limitation of the SWIOTLB implementation,
> which does not support allocations larger than 256kb.  When the
> virtio-blk driver tries to read/write a block larger than that, the
> allocation of the dma-handle fails and an IO error is reported.
> 
> Changes to v2 are:
> 
> 	* Check if SWIOTLB is active before returning its limit in
> 	  dma_direct_max_mapping_size()
> 
> 	* Only apply the maximum segment limit in virtio-blk when
> 	  DMA-API is used for the vring
> 
> Please review.
> 
> Thanks,
> 
> 	Joerg
> 
> Joerg Roedel (5):
>   swiotlb: Introduce swiotlb_max_mapping_size()
>   swiotlb: Add is_swiotlb_active() function
>   dma: Introduce dma_max_mapping_size()
>   virtio: Introduce virtio_max_dma_size()
>   virtio-blk: Consider virtio_max_dma_size() for maximum segment size
> 
>  drivers/block/virtio_blk.c   | 10 ++++++----
>  drivers/virtio/virtio_ring.c | 10 ++++++++++

The kvm-devel mailing list should have been copied on those.

When you do can you please put 'Reviewed-by: Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com>' on all of them?

Thank you!

P.S.
Christopher, I am assuming you are OK with this idea, if so - and once
the owners of 'virtio' Ack, do you want to put it in my tree?

Thanks!
>  include/linux/dma-mapping.h  | 16 ++++++++++++++++
>  include/linux/swiotlb.h      | 11 +++++++++++
>  include/linux/virtio.h       |  2 ++
>  kernel/dma/direct.c          | 11 +++++++++++
>  kernel/dma/swiotlb.c         | 10 ++++++++++
>  7 files changed, 66 insertions(+), 4 deletions(-)


> 
> -- 
> 2.17.1
>