linux-kernel - [PATCH v7 0/5] Fix virtio-blk issue with SWIOTLB

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Date:   Thu,  7 Feb 2019 12:59:12 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     "Michael S . Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Christoph Hellwig <hch@....de>
Cc:     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, joro@...tes.org,
        jroedel@...e.de, Thomas.Lendacky@....com
Subject: [PATCH v7 0/5] Fix virtio-blk issue with SWIOTLB 

Hi,

here is the next 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/

	V3: https://lore.kernel.org/lkml/20190123163049.24863-1-joro@8bytes.org/

	V4: https://lore.kernel.org/lkml/20190129084342.26030-1-joro@8bytes.org/

	V5: https://lore.kernel.org/lkml/20190130164007.26497-1-joro@8bytes.org/

	V6: https://lore.kernel.org/lkml/20190131163403.11363-1-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 v6 are:

	- Fix build errors with CONFIG_SWIOTLB=n

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

 Documentation/DMA-API.txt    |  8 ++++++++
 drivers/block/virtio_blk.c   | 10 ++++++----
 drivers/virtio/virtio_ring.c | 11 +++++++++++
 include/linux/dma-mapping.h  |  8 ++++++++
 include/linux/swiotlb.h      | 11 +++++++++++
 include/linux/virtio.h       |  2 ++
 kernel/dma/direct.c          | 11 +++++++++++
 kernel/dma/mapping.c         | 14 ++++++++++++++
 kernel/dma/swiotlb.c         | 14 ++++++++++++++
 9 files changed, 85 insertions(+), 4 deletions(-)

-- 
2.17.1