From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 0/5 v5] Fix virtio-blk issue with SWIOTLB Date: Wed, 30 Jan 2019 17:40:02 +0100 Message-ID: <20190130164007.26497-1-joro@8bytes.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: "Michael S . Tsirkin" , Jason Wang , Konrad Rzeszutek Wilk , Christoph Hellwig Cc: Jens Axboe , virtualization@lists.linux-foundation.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, jfehlig@suse.com, jon.grimm@amd.com, brijesh.singh@amd.com, joro@8bytes.org, jroedel@suse.de, Thomas.Lendacky@amd.com List-Id: iommu@lists.linux-foundation.org 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/ 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 v4 are: - Added Reviewed-by tags from Christoph - Added missing EXPORT_SYMBOL(_GPL) lines 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 | 16 ++++++++++++++++ include/linux/swiotlb.h | 11 +++++++++++ include/linux/virtio.h | 2 ++ kernel/dma/direct.c | 12 ++++++++++++ kernel/dma/swiotlb.c | 14 ++++++++++++++ 8 files changed, 80 insertions(+), 4 deletions(-) -- 2.17.1